// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/machine.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/irq.h>
#define PCH_VBUS_PERIOD 3000 /* VBUS polling period (msec) */
#define PCH_VBUS_INTERVAL 10 /* VBUS polling interval (msec) */
/* Address offset of Registers */
#define UDC_EP_REG_SHIFT 0x20 /* Offset to next EP */
#define UDC_EPCTL_ADDR 0x00 /* Endpoint control */
#define UDC_EPSTS_ADDR 0x04 /* Endpoint status */
#define UDC_BUFIN_FRAMENUM_ADDR 0x08 /* buffer size in / frame number out */
#define UDC_BUFOUT_MAXPKT_ADDR 0x0C /* buffer size out / maxpkt in */
#define UDC_SUBPTR_ADDR 0x10 /* setup buffer pointer */
#define UDC_DESPTR_ADDR 0x14 /* Data descriptor pointer */
#define UDC_CONFIRM_ADDR 0x18 /* Write/Read confirmation */
#define UDC_DEVCFG_ADDR 0x400 /* Device configuration */
#define UDC_DEVCTL_ADDR 0x404 /* Device control */
#define UDC_DEVSTS_ADDR 0x408 /* Device status */
#define UDC_DEVIRQSTS_ADDR 0x40C /* Device irq status */
#define UDC_DEVIRQMSK_ADDR 0x410 /* Device irq mask */
#define UDC_EPIRQSTS_ADDR 0x414 /* Endpoint irq status */
#define UDC_EPIRQMSK_ADDR 0x418 /* Endpoint irq mask */
#define UDC_DEVLPM_ADDR 0x41C /* LPM control / status */
#define UDC_CSR_BUSY_ADDR 0x4f0 /* UDC_CSR_BUSY Status register */
#define UDC_SRST_ADDR 0x4fc /* SOFT RESET register */
#define UDC_CSR_ADDR 0x500 /* USB_DEVICE endpoint register */
/* Endpoint control register */
/* Bit position */
#define UDC_EPCTL_MRXFLUSH (1 << 12)
#define UDC_EPCTL_RRDY (1 << 9)
#define UDC_EPCTL_CNAK (1 << 8)
#define UDC_EPCTL_SNAK (1 << 7)
#define UDC_EPCTL_NAK (1 << 6)
#define UDC_EPCTL_P (1 << 3)
#define UDC_EPCTL_F (1 << 1)
#define UDC_EPCTL_S (1 << 0)
#define UDC_EPCTL_ET_SHIFT 4
/* Mask patern */
#define UDC_EPCTL_ET_MASK 0x00000030
/* Value for ET field */
#define UDC_EPCTL_ET_CONTROL 0
#define UDC_EPCTL_ET_ISO 1
#define UDC_EPCTL_ET_BULK 2
#define UDC_EPCTL_ET_INTERRUPT 3
/* Endpoint status register */
/* Bit position */
#define UDC_EPSTS_XFERDONE (1 << 27)
#define UDC_EPSTS_RSS (1 << 26)
#define UDC_EPSTS_RCS (1 << 25)
#define UDC_EPSTS_TXEMPTY (1 << 24)
#define UDC_EPSTS_TDC (1 << 10)
#define UDC_EPSTS_HE (1 << 9)
#define UDC_EPSTS_MRXFIFO_EMP (1 << 8)
#define UDC_EPSTS_BNA (1 << 7)
#define UDC_EPSTS_IN (1 << 6)
#define UDC_EPSTS_OUT_SHIFT 4
/* Mask patern */
#define UDC_EPSTS_OUT_MASK 0x00000030
#define UDC_EPSTS_ALL_CLR_MASK 0x1F0006F0
/* Value for OUT field */
#define UDC_EPSTS_OUT_SETUP 2
#define UDC_EPSTS_OUT_DATA 1
/* Device configuration register */
/* Bit position */
#define UDC_DEVCFG_CSR_PRG (1 << 17)
#define UDC_DEVCFG_SP (1 << 3)
/* SPD Valee */
#define UDC_DEVCFG_SPD_HS 0x0
#define UDC_DEVCFG_SPD_FS 0x1
#define UDC_DEVCFG_SPD_LS 0x2
/* Device control register */
/* Bit position */
#define UDC_DEVCTL_THLEN_SHIFT 24
#define UDC_DEVCTL_BRLEN_SHIFT 16
#define UDC_DEVCTL_CSR_DONE (1 << 13)
#define UDC_DEVCTL_SD (1 << 10)
#define UDC_DEVCTL_MODE (1 << 9)
#define UDC_DEVCTL_BREN (1 << 8)
#define UDC_DEVCTL_THE (1 << 7)
#define UDC_DEVCTL_DU (1 << 4)
#define UDC_DEVCTL_TDE (1 << 3)
#define UDC_DEVCTL_RDE (1 << 2)
#define UDC_DEVCTL_RES (1 << 0)
/* Device status register */
/* Bit position */
#define UDC_DEVSTS_TS_SHIFT 18
#define UDC_DEVSTS_ENUM_SPEED_SHIFT 13
#define UDC_DEVSTS_ALT_SHIFT 8
#define UDC_DEVSTS_INTF_SHIFT 4
#define UDC_DEVSTS_CFG_SHIFT 0
/* Mask patern */
#define UDC_DEVSTS_TS_MASK 0xfffc0000
#define UDC_DEVSTS_ENUM_SPEED_MASK 0x00006000
#define UDC_DEVSTS_ALT_MASK 0x00000f00
#define UDC_DEVSTS_INTF_MASK 0x000000f0
#define UDC_DEVSTS_CFG_MASK 0x0000000f
/* value for maximum speed for SPEED field */
#define UDC_DEVSTS_ENUM_SPEED_FULL 1
#define UDC_DEVSTS_ENUM_SPEED_HIGH 0
#define UDC_DEVSTS_ENUM_SPEED_LOW 2
#define UDC_DEVSTS_ENUM_SPEED_FULLX 3
/* Device irq register */
/* Bit position */
#define UDC_DEVINT_RWKP (1 << 7)
#define UDC_DEVINT_ENUM (1 << 6)
#define UDC_DEVINT_SOF (1 << 5)
#define UDC_DEVINT_US (1 << 4)
#define UDC_DEVINT_UR (1 << 3)
#define UDC_DEVINT_ES (1 << 2)
#define UDC_DEVINT_SI (1 << 1)
#define UDC_DEVINT_SC (1 << 0)
/* Mask patern */
#define UDC_DEVINT_MSK 0x7f
/* Endpoint irq register */
/* Bit position */
#define UDC_EPINT_IN_SHIFT 0
#define UDC_EPINT_OUT_SHIFT 16
#define UDC_EPINT_IN_EP0 (1 << 0)
#define UDC_EPINT_OUT_EP0 (1 << 16)
/* Mask patern */
#define UDC_EPINT_MSK_DISABLE_ALL 0xffffffff
/* UDC_CSR_BUSY Status register */
/* Bit position */
#define UDC_CSR_BUSY (1 << 0)
/* SOFT RESET register */
/* Bit position */
#define UDC_PSRST (1 << 1)
#define UDC_SRST (1 << 0)
/* USB_DEVICE endpoint register */
/* Bit position */
#define UDC_CSR_NE_NUM_SHIFT 0
#define UDC_CSR_NE_DIR_SHIFT 4
#define UDC_CSR_NE_TYPE_SHIFT 5
#define UDC_CSR_NE_CFG_SHIFT 7
#define UDC_CSR_NE_INTF_SHIFT 11
#define UDC_CSR_NE_ALT_SHIFT 15
#define UDC_CSR_NE_MAX_PKT_SHIFT 19
/* Mask patern */
#define UDC_CSR_NE_NUM_MASK 0x0000000f
#define UDC_CSR_NE_DIR_MASK 0x00000010
#define UDC_CSR_NE_TYPE_MASK 0x00000060
#define UDC_CSR_NE_CFG_MASK 0x00000780
#define UDC_CSR_NE_INTF_MASK 0x00007800
#define UDC_CSR_NE_ALT_MASK 0x00078000
#define UDC_CSR_NE_MAX_PKT_MASK 0x3ff80000
#define PCH_UDC_CSR(ep) (UDC_CSR_ADDR + ep*4)
#define PCH_UDC_EPINT(in, num)\
(1 << (num + (in ? UDC_EPINT_IN_SHIFT : UDC_EPINT_OUT_SHIFT)))
/* Index of endpoint */
#define UDC_EP0IN_IDX 0
#define UDC_EP0OUT_IDX 1
#define UDC_EPIN_IDX(ep) (ep * 2)
#define UDC_EPOUT_IDX(ep) (ep * 2 + 1)
#define PCH_UDC_EP0 0
#define PCH_UDC_EP1 1
#define PCH_UDC_EP2 2
#define PCH_UDC_EP3 3
/* Number of endpoint */
#define PCH_UDC_EP_NUM 32 /* Total number of EPs (16 IN,16 OUT) */
#define PCH_UDC_USED_EP_NUM 4 /* EP number of EP's really used */
/* Length Value */
#define PCH_UDC_BRLEN 0x0F /* Burst length */
#define PCH_UDC_THLEN 0x1F /* Threshold length */
/* Value of EP Buffer Size */
#define UDC_EP0IN_BUFF_SIZE 16
#define UDC_EPIN_BUFF_SIZE 256
#define UDC_EP0OUT_BUFF_SIZE 16
#define UDC_EPOUT_BUFF_SIZE 256
/* Value of EP maximum packet size */
#define UDC_EP0IN_MAX_PKT_SIZE 64
#define UDC_EP0OUT_MAX_PKT_SIZE 64
#define UDC_BULK_MAX_PKT_SIZE 512
/* DMA */
#define DMA_DIR_RX 1 /* DMA for data receive */
#define DMA_DIR_TX 2 /* DMA for data transmit */
#define DMA_ADDR_INVALID (~(dma_addr_t)0)
#define UDC_DMA_MAXPACKET 65536 /* maximum packet size for DMA */
/**
* struct pch_udc_data_dma_desc - Structure to hold DMA descriptor information
* for data
* @status: Status quadlet
* @reserved: Reserved
* @dataptr: Buffer descriptor
* @next: Next descriptor
*/
struct pch_udc_data_dma_desc {
u32 status;
u32 reserved;
u32 dataptr;
u32 next;
};
/**
* struct pch_udc_stp_dma_desc - Structure to hold DMA descriptor information
* for control data
* @status: Status
* @reserved: Reserved
* @request: Control Request
*/
struct pch_udc_stp_dma_desc {
u32 status;
u32 reserved;
struct usb_ctrlrequest request;
} __attribute((packed));
/* DMA status definitions */
/* Buffer status */
#define PCH_UDC_BUFF_STS 0xC0000000
#define PCH_UDC_BS_HST_RDY 0x00000000
#define PCH_UDC_BS_DMA_BSY 0x40000000
#define PCH_UDC_BS_DMA_DONE 0x80000000
#define PCH_UDC_BS_HST_BSY 0xC0000000
/* Rx/Tx Status */
#define PCH_UDC_RXTX_STS 0x30000000
#define PCH_UDC_RTS_SUCC 0x00000000
#define PCH_UDC_RTS_DESERR 0x10000000
#define PCH_UDC_RTS_BUFERR 0x30000000
/* Last Descriptor Indication */
#define PCH_UDC_DMA_LAST 0x08000000
/* Number of Rx/Tx Bytes Mask */
#define PCH_UDC_RXTX_BYTES 0x0000ffff
/**
* struct pch_udc_cfg_data - Structure to hold current configuration
* and interface information
* @cur_cfg: current configuration in use
* @cur_intf: current interface in use
* @cur_alt: current alt interface in use
*/
struct pch_udc_cfg_data {
u16 cur_cfg;
u16 cur_intf;
u16 cur_alt;
};
/**
* struct pch_udc_ep - Structure holding a PCH USB device Endpoint information
* @ep: embedded ep request
* @td_stp_phys: for setup request
* @td_data_phys: for data request
* @td_stp: for setup request
* @td_data: for data request
* @dev: reference to device struct
* @offset_addr: offset address of ep register
* @queue: queue for requests
* @num: endpoint number
* @in: endpoint is IN
* @halted: endpoint halted?
* @epsts: Endpoint status
*/
struct pch_udc_ep {
struct usb_ep ep;
dma_addr_t td_stp_phys;
dma_addr_t td_data_phys;
struct pch_udc_stp_dma_desc *td_stp;
struct pch_udc_data_dma_desc *td_data;
struct pch_udc_dev *dev;
unsigned long offset_addr;
struct list_head queue;
unsigned num:5,
in:1,
halted:1;
unsigned long epsts;
};
/**
* struct pch_vbus_gpio_data - Structure holding GPIO informaton
* for detecting VBUS
* @port: gpio descriptor for the VBUS GPIO
* @intr: gpio interrupt number
* @irq_work_fall: Structure for WorkQueue
* @irq_work_rise: Structure for WorkQueue
*/
struct pch_vbus_gpio_data {
struct gpio_desc *port;
int intr;
struct work_struct irq_work_fall;
struct work_struct irq_work_rise;
};
/**
* struct pch_udc_dev - Structure holding complete information
* of the PCH USB device
* @gadget: gadget driver data
* @driver: reference to gadget driver bound
* @pdev: reference to the PCI device
* @ep: array of endpoints
* @lock: protects all state
* @stall: stall requested
* @prot_stall: protcol stall requested
* @registered: driver registered with system
* @suspended: driver in suspended state
* @connected: gadget driver associated
* @vbus_session: required vbus_session state
* @set_cfg_not_acked: pending acknowledgement 4 setup
* @waiting_zlp_ack: pending acknowledgement 4 ZLP
* @data_requests: DMA pool for data requests
* @stp_requests: DMA pool for setup requests
* @dma_addr: DMA pool for received
* @setup_data: Received setup data
* @base_addr: for mapped device memory
* @bar: PCI BAR used for mapped device memory
* @cfg_data: current cfg, intf, and alt in use
* @vbus_gpio: GPIO informaton for detecting VBUS
*/
struct pch_udc_dev {
struct usb_gadget gadget;
struct usb_gadget_driver *driver;
struct pci_dev *pdev;
struct pch_udc_ep ep[PCH_UDC_EP_NUM];
spinlock_t lock; /* protects all state */
unsigned
stall:1,
prot_stall:1,
suspended:1,
connected:1,
vbus_session:1,
set_cfg_not_acked:1,
waiting_zlp_ack:1;
struct dma_pool *data_requests;
struct dma_pool *stp_requests;
dma_addr_t dma_addr;
struct usb_ctrlrequest setup_data;
void __iomem *base_addr;
unsigned short bar;
struct pch_udc_cfg_data cfg_data;
struct pch_vbus_gpio_data vbus_gpio;
};
#define to_pch_udc(g) (container_of((g), struct pch_udc_dev, gadget))
#define PCH_UDC_PCI_BAR_QUARK_X1000 0
#define PCH_UDC_PCI_BAR 1
#define PCI_DEVICE_ID_INTEL_QUARK_X1000_UDC 0x0939
#define PCI_DEVICE_ID_INTEL_EG20T_UDC 0x8808
#define PCI_DEVICE_ID_ML7213_IOH_UDC 0x801D
#define PCI_DEVICE_ID_ML7831_IOH_UDC 0x8808
static const char ep0_string[] = "ep0in";
static DEFINE_SPINLOCK(udc_stall_spinlock); /* stall spin lock */
static bool speed_fs;
module_param_named(speed_fs, speed_fs, bool, S_IRUGO);
MODULE_PARM_DESC(speed_fs, "true for Full speed operation");
/**
* struct pch_udc_request - Structure holding a PCH USB device request packet
* @req: embedded ep request
* @td_data_phys: phys. address
* @td_data: first dma desc. of chain
* @td_data_last: last dma desc. of chain
* @queue: associated queue
* @dma_going: DMA in progress for request
* @dma_done: DMA completed for request
* @chain_len: chain length
*/
struct pch_udc_request {
struct usb_request req;
dma_addr_t td_data_phys;
struct pch_udc_data_dma_desc *td_data;
struct pch_udc_data_dma_desc *td_data_last;
struct list_head queue;
unsigned dma_going:1,
dma_done:1;
unsigned chain_len;
};
static inline u32 pch_udc_readl(struct pch_udc_dev *dev, unsigned long reg)
{
return ioread32(dev->base_addr + reg);
}
static inline void pch_udc_writel(struct pch_udc_dev *dev,
unsigned long val, unsigned long reg)
{
iowrite32(val, dev->base_addr + reg);
}
static inline void pch_udc_bit_set(struct pch_udc_dev *dev,
unsigned long reg,
unsigned long bitmask)
{
pch_udc_writel(dev, pch_udc_readl(dev, reg) | bitmask, reg);
}
static inline void pch_udc_bit_clr(struct pch_udc_dev *dev,
unsigned long reg,
unsigned long bitmask)
{
pch_udc_writel(dev, pch_udc_readl(dev, reg) & ~(bitmask), reg);
}
static inline u32 pch_udc_ep_readl(struct pch_udc_ep *ep, unsigned long reg)
{
return ioread32(ep->dev->base_addr + ep->offset_addr + reg);
}
static inline void pch_udc_ep_writel(struct pch_udc_ep *ep,
unsigned long val, unsigned long reg)
{
iowrite32(val, ep->dev->base_addr + ep->offset_addr + reg);
}
static inline void pch_udc_ep_bit_set(struct pch_udc_ep *ep,
unsigned long reg,
unsigned long bitmask)
{
pch_udc_ep_writel(ep, pch_udc_ep_readl(ep, reg) | bitmask, reg);
}
static inline void pch_udc_ep_bit_clr(struct pch_udc_ep *ep,
unsigned long reg,
unsigned long bitmask)
{
pch_udc_ep_writel(ep, pch_udc_ep_readl(ep, reg) & ~(bitmask), reg);
}
/**
* pch_udc_csr_busy() - Wait till idle.
* @dev: Reference to pch_udc_dev structure
*/
static void pch_udc_csr_busy(struct pch_udc_dev *dev)
{
unsigned int count = 200;
/* Wait till idle */
while ((pch_udc_readl(dev, UDC_CSR_BUSY_ADDR) & UDC_CSR_BUSY)
&& --count)
cpu_relax();
if (!count)
dev_err(&dev->pdev->dev, "%s: wait error\n", __func__);
}
/**
* pch_udc_write_csr() - Write the command and status registers.
* @dev: Reference to pch_udc_dev structure
* @val: value to be written to CSR register
* @ep: end-point number
*/
static void pch_udc_write_csr(struct pch_udc_dev *dev, unsigned long val,
unsigned int ep)
{
unsigned long reg = PCH_UDC_CSR(ep);
pch_udc_csr_busy(dev); /* Wait till idle */
pch_udc_writel(dev, val, reg);
pch_udc_csr_busy(dev); /* Wait till idle */
}
/**
* pch_udc_read_csr() - Read the command and status registers.
* @dev: Reference to pch_udc_dev structure
* @ep: end-point number
*
* Return codes: content of CSR register
*/
static u32 pch_udc_read_csr(struct pch_udc_dev *dev, unsigned int ep)
{
unsigned long reg = PCH_UDC_CSR(ep);
pch_udc_csr_busy(dev); /* Wait till idle */
pch_udc_readl(dev, reg); /* Dummy read */
pch_udc_csr_busy(dev); /* Wait till idle */
return pch_udc_readl(dev, reg);
}
/**
* pch_udc_rmt_wakeup() - Initiate for remote wakeup
* @dev: Reference to pch_udc_dev structure
*/
static inline void pch_udc_rmt_wakeup(struct pch_udc_dev *dev)
{
pch_udc_bit_set(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_RES);
mdelay(1);
pch_udc_bit_clr(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_RES);
}
/**
* pch_udc_get_frame() - Get the current frame from device status register
* @dev: Reference to pch_udc_dev structure
* Retern current frame
*/
static inline int pch_udc_get_frame(struct pch_udc_dev *dev)
{
u32 frame = pch_udc_readl(dev, UDC_DEVSTS_ADDR);
return (frame & UDC_DEVSTS_TS_MASK) >> UDC_DEVSTS_TS_SHIFT;
}
/**
* pch_udc_clear_selfpowered() - Clear the self power control
* @dev: Reference to pch_udc_regs structure
*/
static inline void pch_udc_clear_selfpowered(struct pch_udc_dev *dev)
{
pch_udc_bit_clr(dev, UDC_DEVCFG_ADDR, UDC_DEVCFG_SP);
}
/**
* pch_udc_set_selfpowered() - Set the self power control
* @dev: Reference to pch_udc_regs structure
*/
static inline void pch_udc_set_selfpowered(struct pch_udc_dev *dev)
{
pch_udc_bit_set(dev, UDC_DEVCFG_ADDR, UDC_DEVCFG_SP);
}
/**
* pch_udc_set_disconnect() - Set the disconnect status.
* @dev: Reference to pch_udc_regs structure
*/
static inline void pch_udc_set_disconnect(struct pch_udc_dev *dev)
{
pch_udc_bit_set(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_SD);
}
/**
* pch_udc_clear_disconnect() - Clear the disconnect status.
* @dev: Reference to pch_udc_regs structure
*/
static void pch_udc_clear_disconnect(struct pch_udc_dev *dev)
{
/* Clear the disconnect */
pch_udc_bit_set(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_RES);
pch_udc_bit_clr(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_SD);
mdelay(1);
/* Resume USB signalling */
pch_udc_bit_clr(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_RES);
}
static void pch_udc_init(struct pch_udc_dev *dev);
/**
* pch_udc_reconnect() - This API initializes usb device controller,
* and clear the disconnect status.
* @dev: Reference to pch_udc_regs structure
*/
static void pch_udc_reconnect(struct pch_udc_dev *dev)
{
pch_udc_init(dev);
/* enable device interrupts */
/* pch_udc_enable_interrupts() */
pch_udc_bit_clr(dev, UDC_DEVIRQMSK_ADDR,
UDC_DEVINT_UR | UDC_DEVINT_ENUM);
/* Clear the disconnect */
pch_udc_bit_set(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_RES);
pch_udc_bit_clr(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_SD);
mdelay(1);
/* Resume USB signalling */
pch_udc_bit_clr(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_RES);
}
/**
* pch_udc_vbus_session() - set or clearr the disconnect status.
* @dev: Reference to pch_udc_regs structure
* @is_active: Parameter specifying the action
* 0: indicating VBUS power is ending
* !0: indicating VBUS power is starting
*/
static inline void pch_udc_vbus_session(struct pch_udc_dev *dev,
int is_active)
{
unsigned long iflags;
spin_lock_irqsave(&dev->lock, iflags);
if (is_active) {
pch_udc_reconnect(dev);
dev->vbus_session = 1;
} else {
if (dev->driver && dev->driver->disconnect) {
spin_unlock_irqrestore(&dev->lock, iflags);
dev->driver->disconnect(&dev->gadget);
spin_lock_irqsave(&dev->lock, iflags);
}
pch_udc_set_disconnect(dev);
dev->vbus_session = 0;
}
spin_unlock_irqrestore(&dev->lock, iflags);
}
/**
* pch_udc_ep_set_stall() - Set the stall of endpoint
* @ep: Reference to structure of type pch_udc_ep_regs
*/
static void pch_udc_ep_set_stall(struct pch_udc_ep *ep)
{
if (ep->in) {
pch_udc_ep_bit_set(ep, UDC_EPCTL_ADDR, UDC_EPCTL_F);
pch_udc_ep_bit_set(ep, UDC_EPCTL_ADDR, UDC_EPCTL_S);
} else {
pch_udc_ep_bit_set(ep, UDC_EPCTL_ADDR, UDC_EPCTL_S);
}
}
/**
* pch_udc_ep_clear_stall() - Clear the stall of endpoint
* @ep: Reference to structure of type pch_udc_ep_regs
*/
static inline void pch_udc_ep_clear_stall(struct pch_udc_ep *ep)
{
/* Clear the stall */
pch_udc_ep_bit_clr(ep, UDC_EPCTL_ADDR, UDC_EPCTL_S);
/* Clear NAK by writing CNAK */
pch_udc_ep_bit_set(ep, UDC_EPCTL_ADDR, UDC_EPCTL_CNAK);
}
/**
* pch_udc_ep_set_trfr_type() - Set the transfer type of endpoint
* @ep: Reference to structure of type pch_udc_ep_regs
* @type: Type of endpoint
*/
static inline void pch_udc_ep_set_trfr_type(struct pch_udc_ep *ep,
u8 type)
{
pch_udc_ep_writel(ep, ((type << UDC_EPCTL_ET_SHIFT) &
UDC_EPCTL_ET_MASK), UDC_EPCTL_ADDR);
}
/**
* pch_udc_ep_set_bufsz() - Set the maximum packet size for the endpoint
* @ep: Reference to structure of type pch_udc_ep_regs
* @buf_size: The buffer word size
* @ep_in: EP is IN
*/
static void pch_udc_ep_set_bufsz(struct pch_udc_ep *ep,
u32 buf_size, u32 ep_in)
{
u32 data;
if (ep_in) {
data = pch_udc_ep_readl(ep, UDC_BUFIN_FRAMENUM_ADDR);
data = (data & 0xffff0000) | (buf_size & 0xffff);
pch_udc_ep_writel(ep, data, UDC_BUFIN_FRAMENUM_ADDR);
} else {
data = pch_udc_ep_readl(ep, UDC_BUFOUT_MAXPKT_ADDR);
data = (buf_size << 16) | (data & 0xffff);
pch_udc_ep_writel(ep, data, UDC_BUFOUT_MAXPKT_ADDR);
}
}
/**
* pch_udc_ep_set_maxpkt() - Set the Max packet size for the endpoint
* @ep: Reference to structure of type pch_udc_ep_regs
* @pkt_size: The packet byte size
*/
static void pch_udc_ep_set_maxpkt(struct pch_udc_ep *ep, u32 pkt_size)
{
u32 data = pch_udc_ep_readl(ep, UDC_BUFOUT_MAXPKT_ADDR);
data = (data & 0xffff0000) | (pkt_size & 0xffff);
pch_udc_ep_writel(ep, data, UDC_BUFOUT_MAXPKT_ADDR);
}
/**
* pch_udc_ep_set_subptr() - Set the Setup buffer pointer for the endpoint
* @ep: Reference to structure of type pch_udc_ep_regs
* @addr: Address of the register
*/
static inline void pch_udc_ep_set_subptr(struct pch_udc_ep *ep, u32 addr)
{
pch_udc_ep_writel(ep, addr, UDC_SUBPTR_ADDR);
}
/**
* pch_udc_ep_set_ddptr() - Set the Data descriptor pointer for the endpoint
* @ep: Reference to structure of type pch_udc_ep_regs
* @addr: Address of the register
*/
static inline void pch_udc_ep_set_ddptr(struct pch_udc_ep *ep, u32 addr)
{
pch_udc_ep_writel(ep, addr, UDC_DESPTR_ADDR);
}
/**
* pch_udc_ep_set_pd() - Set the poll demand bit for the endpoint
* @ep: Reference to structure of type pch_udc_ep_regs
*/
static inline void pch_udc_ep_set_pd(struct pch_udc_ep *ep)
{
pch_udc_ep_bit_set(ep, UDC_EPCTL_ADDR, UDC_EPCTL_P);
}
/**
* pch_udc_ep_set_rrdy() - Set the receive ready bit for the endpoint
* @ep: Reference to structure of type pch_udc_ep_regs
*/
static inline void pch_udc_ep_set_rrdy(struct pch_udc_ep *ep)
{
pch_udc_ep_bit_set(ep, UDC_EPCTL_ADDR, UDC_EPCTL_RRDY);
}
/**
* pch_udc_ep_clear_rrdy() - Clear the receive ready bit for the endpoint
* @ep: Reference to structure of type pch_udc_ep_regs
*/
static inline void pch_udc_ep_clear_rrdy(struct pch_udc_ep *ep)
{
pch_udc_ep_bit_clr(ep, UDC_EPCTL_ADDR, UDC_EPCTL_RRDY);
}
/**
* pch_udc_set_dma() - Set the 'TDE' or RDE bit of device control
* register depending on the direction specified
* @dev: Reference to structure of type pch_udc_regs
* @dir: whether Tx or Rx
* DMA_DIR_RX: Receive
* DMA_DIR_TX: Transmit
*/
static inline void pch_udc_set_dma(struct pch_udc_dev *dev, int dir)
{
if (dir == DMA_DIR_RX)
pch_udc_bit_set(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_RDE);
else if (dir == DMA_DIR_TX)
pch_udc_bit_set(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_TDE);
}
/**
* pch_udc_clear_dma() - Clear the 'TDE' or RDE bit of device control
* register depending on the direction specified
* @dev: Reference to structure of type pch_udc_regs
* @dir: Whether Tx or Rx
* DMA_DIR_RX: Receive
* DMA_DIR_TX: Transmit
*/
static inline void pch_udc_clear_dma(struct pch_udc_dev *dev, int dir)
{
if (dir == DMA_DIR_RX)
pch_udc_bit_clr(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_RDE);
else if (dir == DMA_DIR_TX)
pch_udc_bit_clr(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_TDE);
}
/**
* pch_udc_set_csr_done() - Set the device control register
* CSR done field (bit 13)
* @dev: reference to structure of type pch_udc_regs
*/
static inline void pch_udc_set_csr_done(struct pch_udc_dev *dev)
{
pch_udc_bit_set(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_CSR_DONE);
}
/**
* pch_udc_disable_interrupts() - Disables the specified interrupts
* @dev: Reference to structure of type pch_udc_regs
* @mask: Mask to disable interrupts
*/
static inline void pch_udc_disable_interrupts(struct pch_udc_dev *dev,
u32 mask)
{
pch_udc_bit_set(dev, UDC_DEVIRQMSK_ADDR, mask);
}
/**
* pch_udc_enable_interrupts() - Enable the specified interrupts
* @dev: Reference to structure of type pch_udc_regs
* @mask: Mask to enable interrupts
*/
static inline void pch_udc_enable_interrupts(struct pch_udc_dev *dev,
u32 mask)
{
pch_udc_bit_clr(dev, UDC_DEVIRQMSK_ADDR, mask);
}
/**
* pch_udc_disable_ep_interrupts() - Disable endpoint interrupts
* @dev: Reference to structure of type pch_udc_regs
* @mask: Mask to disable interrupts
*/
static inline void pch_udc_disable_ep_interrupts(struct pch_udc_dev *dev,
u32 mask)
{
pch_udc_bit_set(dev, UDC_EPIRQMSK_ADDR, mask);
}
/**
* pch_udc_enable_ep_interrupts() - Enable endpoint interrupts
* @dev: Reference to structure of type pch_udc_regs
* @mask: Mask to enable interrupts
*/
static inline void pch_udc_enable_ep_interrupts(struct pch_udc_dev *dev,
u32 mask)
{
pch_udc_bit_clr(dev, UDC_EPIRQMSK_ADDR, mask);
}
/**
* pch_udc_read_device_interrupts() - Read the device interrupts
* @dev: Reference to structure of type pch_udc_regs
* Retern The device interrupts
*/
static inline u32 pch_udc_read_device_interrupts(struct pch_udc_dev *dev)
{
return pch_udc_readl(dev, UDC_DEVIRQSTS_ADDR);
}
/**
* pch_udc_write_device_interrupts() - Write device interrupts
* @dev: Reference to structure of type pch_udc_regs
* @val: The value to be written to interrupt register
*/
static inline void pch_udc_write_device_interrupts(struct pch_udc_dev *dev,
u32 val)
{
pch_udc_writel(dev, val, UDC_DEVIRQSTS_ADDR);
}
/**
* pch_udc_read_ep_interrupts() - Read the endpoint interrupts
* @dev: Reference to structure of type pch_udc_regs
* Retern The endpoint interrupt
*/
static inline u32 pch_udc_read_ep_interrupts(struct pch_udc_dev *dev)
{
return pch_udc_readl(dev, UDC_EPIRQSTS_ADDR);
}
/**
* pch_udc_write_ep_interrupts() - Clear endpoint interupts
* @dev: Reference to structure of type pch_udc_regs
* @val: The value to be written to interrupt register
*/
static inline void pch_udc_write_ep_interrupts(struct pch_udc_dev *dev,
u32 val)
{
pch_udc_writel(dev, val, UDC_EPIRQSTS_ADDR);
}
/**
* pch_udc_read_device_status() - Read the device status
* @dev: Reference to structure of type pch_udc_regs
* Retern The device status
*/
static inline u32 pch_udc_read_device_status(struct pch_udc_dev *dev)
{
return pch_udc_readl(dev, UDC_DEVSTS_ADDR);
}
/**
* pch_udc_read_ep_control() - Read the endpoint control
* @ep: Reference to structure of type pch_udc_ep_regs
* Retern The endpoint control register value
*/
static inline u32 pch_udc_read_ep_control(struct pch_udc_ep *ep)
{
return pch_udc_ep_readl(ep, UDC_EPCTL_ADDR);
}
/**
* pch_udc_clear_ep_control() - Clear the endpoint control register
* @ep: Reference to structure of type pch_udc_ep_regs
* Retern The endpoint control register value
*/
static inline void pch_udc_clear_ep_control(struct pch_udc_ep *ep)
{
return pch_udc_ep_writel(ep, 0, UDC_EPCTL_ADDR);
}
/**
* pch_udc_read_ep_status() - Read the endpoint status
* @ep: Reference to structure of type pch_udc_ep_regs
* Retern The endpoint status
*/
static inline u32 pch_udc_read_ep_status(struct pch_udc_ep *ep)
{
return pch_udc_ep_readl(ep, UDC_EPSTS_ADDR);
}
/**
* pch_udc_clear_ep_status() - Clear the endpoint status
* @ep: Reference to structure of type pch_udc_ep_regs
* @stat: Endpoint status
*/
static inline void pch_udc_clear_ep_status(struct pch_udc_ep *ep,
u32 stat)
{
return pch_udc_ep_writel(ep, stat, UDC_EPSTS_ADDR);
}
/**
* pch_udc_ep_set_nak() - Set the bit 7 (SNAK field)
* of the endpoint control register
* @ep: Reference to structure of type pch_udc_ep_regs
*/
static inline void pch_udc_ep_set_nak(struct pch_udc_ep *ep)
{
pch_udc_ep_bit_set(ep, UDC_EPCTL_ADDR, UDC_EPCTL_SNAK);
}
/**
* pch_udc_ep_clear_nak() - Set the bit 8 (CNAK field)
* of the endpoint control register
* @ep: reference to structure of type pch_udc_ep_regs
*/
static void pch_udc_ep_clear_nak(struct pch_udc_ep *ep)
{
unsigned int loopcnt = 0;
struct pch_udc_dev *dev = ep->dev;
if (!(pch_udc_ep_readl(ep, UDC_EPCTL_ADDR) & UDC_EPCTL_NAK))
return;
if (!ep->in) {
loopcnt = 10000;
while (!(pch_udc_read_ep_status(ep) & UDC_EPSTS_MRXFIFO_EMP) &&
--loopcnt)
udelay(5);
if (!loopcnt)
dev_err(&dev->pdev->dev, "%s: RxFIFO not Empty\n",
__func__);
}
loopcnt = 10000;
while ((pch_udc_read_ep_control(ep) & UDC_EPCTL_NAK) && --loopcnt) {
pch_udc_ep_bit_set(ep, UDC_EPCTL_ADDR, UDC_EPCTL_CNAK);
udelay(5);
}
if (!loopcnt)
dev_err(&dev->pdev->dev, "%s: Clear NAK not set for ep%d%s\n",
__func__, ep->num, (ep->in ? "in" : "out"));
}
/**
* pch_udc_ep_fifo_flush() - Flush the endpoint fifo
* @ep: reference to structure of type pch_udc_ep_regs
* @dir: direction of endpoint
* 0: endpoint is OUT
* !0: endpoint is IN
*/
static void pch_udc_ep_fifo_flush(struct pch_udc_ep *ep, int dir)
{
if (dir) { /* IN ep */
pch_udc_ep_bit_set(ep, UDC_EPCTL_ADDR, UDC_EPCTL_F);
return;
}
}
/**
* pch_udc_ep_enable() - This api enables endpoint
* @ep: reference to structure of type pch_udc_ep_regs
* @cfg: current configuration information
* @desc: endpoint descriptor
*/
static void pch_udc_ep_enable(struct pch_udc_ep *ep,
struct pch_udc_cfg_data *cfg,
const struct usb_endpoint_descriptor *desc)
{
u32 val = 0;
u32 buff_size = 0;
pch_udc_ep_set_trfr_type(ep, desc->bmAttributes);
if (ep->in)
buff_size = UDC_EPIN_BUFF_SIZE;
else
buff_size = UDC_EPOUT_BUFF_SIZE;
pch_udc_ep_set_bufsz(ep, buff_size, ep->in);
pch_udc_ep_set_maxpkt(ep, usb_endpoint_maxp(desc));
pch_udc_ep_set_nak(ep);
pch_udc_ep_fifo_flush(ep, ep->in);
/* Configure the endpoint */
val = ep->num << UDC_CSR_NE_NUM_SHIFT | ep->in << UDC_CSR_NE_DIR_SHIFT |
((desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) <<
UDC_CSR_NE_TYPE_SHIFT) |
(cfg->cur_cfg << UDC_CSR_NE_CFG_SHIFT) |
(cfg->cur_intf << UDC_CSR_NE_INTF_SHIFT) |
(cfg->cur_alt << UDC_CSR_NE_ALT_SHIFT) |
usb_endpoint_maxp(desc) << UDC_CSR_NE_MAX_PKT_SHIFT;
if (ep->in)
pch_udc_write_csr(ep->dev, val, UDC_EPIN_IDX(ep->num));
else
pch_udc_write_csr(ep->dev, val, UDC_EPOUT_IDX(ep->num));
}
/**
* pch_udc_ep_disable() - This api disables endpoint
* @ep: reference to structure of type pch_udc_ep_regs
*/
static void pch_udc_ep_disable(struct pch_udc_ep *ep)
{
if (ep->in) {
/* flush the fifo */
pch_udc_ep_writel(ep, UDC_EPCTL_F, UDC_EPCTL_ADDR);
/* set NAK */
pch_udc_ep_writel(ep, UDC_EPCTL_SNAK, UDC_EPCTL_ADDR);
pch_udc_ep_bit_set(ep, UDC_EPSTS_ADDR, UDC_EPSTS_IN);
} else {
/* set NAK */
pch_udc_ep_writel(ep, UDC_EPCTL_SNAK, UDC_EPCTL_ADDR);
}
/* reset desc pointer */
pch_udc_ep_writel(ep, 0, UDC_DESPTR_ADDR);
}
/**
* pch_udc_wait_ep_stall() - Wait EP stall.
* @ep: reference to structure of type pch_udc_ep_regs
*/
static void pch_udc_wait_ep_stall(struct pch_udc_ep *ep)
{
unsigned int count = 10000;
/* Wait till idle */
while ((pch_udc_read_ep_control(ep) & UDC_EPCTL_S) && --count)
udelay(5);
if (!count)
dev_err(&ep->dev->pdev->dev, "%s: wait error\n", __func__);
}
/**
* pch_udc_init() - This API initializes usb device controller
* @dev: Rreference to pch_udc_regs structure
*/
static void pch_udc_init(struct pch_udc_dev *dev)
{
if (NULL == dev) {
pr_err("%s: Invalid address\n", __func__);
return;
}
/* Soft Reset and Reset PHY */
pch_udc_writel(dev, UDC_SRST, UDC_SRST_ADDR);
pch_udc_writel(dev, UDC_SRST | UDC_PSRST, UDC_SRST_ADDR);
mdelay(1);
pch_udc_writel(dev, UDC_SRST, UDC_SRST_ADDR);
pch_udc_writel(dev, 0x00, UDC_SRST_ADDR);
mdelay(1);
/* mask and clear all device interrupts */
pch_udc_bit_set(dev, UDC_DEVIRQMSK_ADDR, UDC_DEVINT_MSK);
pch_udc_bit_set(dev, UDC_DEVIRQSTS_ADDR, UDC_DEVINT_MSK);
/* mask and clear all ep interrupts */
pch_udc_bit_set(dev, UDC_EPIRQMSK_ADDR, UDC_EPINT_MSK_DISABLE_ALL);
pch_udc_bit_set(dev, UDC_EPIRQSTS_ADDR, UDC_EPINT_MSK_DISABLE_ALL);
/* enable dynamic CSR programmingi, self powered and device speed */
if (speed_fs)
pch_udc_bit_set(dev, UDC_DEVCFG_ADDR, UDC_DEVCFG_CSR_PRG |
UDC_DEVCFG_SP | UDC_DEVCFG_SPD_FS);
else /* defaul high speed */
pch_udc_bit_set(dev, UDC_DEVCFG_ADDR, UDC_DEVCFG_CSR_PRG |
UDC_DEVCFG_SP | UDC_DEVCFG_SPD_HS);
pch_udc_bit_set(dev, UDC_DEVCTL_ADDR,
(PCH_UDC_THLEN << UDC_DEVCTL_THLEN_SHIFT) |
(PCH_UDC_BRLEN << UDC_DEVCTL_BRLEN_SHIFT) |
UDC_DEVCTL_MODE | UDC_DEVCTL_BREN |
UDC_DEVCTL_THE);
}
/**
* pch_udc_exit() - This API exit usb device controller
* @dev: Reference to pch_udc_regs structure
*/
static void pch_udc_exit(struct pch_udc_dev *dev)
{
/* mask all device interrupts */
pch_udc_bit_set(dev, UDC_DEVIRQMSK_ADDR, UDC_DEVINT_MSK);
/* mask all ep interrupts */
pch_udc_bit_set(dev, UDC_EPIRQMSK_ADDR, UDC_EPINT_MSK_DISABLE_ALL);
/* put device in disconnected state */
pch_udc_set_disconnect(dev);
}
/**
* pch_udc_pcd_get_frame() - This API is invoked to get the current frame number
* @gadget: Reference to the gadget driver
*
* Return codes:
* 0: Success
* -EINVAL: If the gadget passed is NULL
*/
static int pch_udc_pcd_get_frame(struct usb_gadget *gadget)
{
struct pch_udc_dev *dev;
if (!gadget)
return -EINVAL;
dev = container_of(gadget, struct pch_udc_dev, gadget);
return pch_udc_get_frame(dev);
}
/**
* pch_udc_pcd_wakeup() - This API is invoked to initiate a remote wakeup
* @gadget: Reference to the gadget driver
*
* Return codes:
* 0: Success
* -EINVAL: If the gadget passed is NULL
*/
static int pch_udc_pcd_wakeup(struct usb_gadget *gadget)
{
struct pch_udc_dev *dev;
unsigned long flags;
if (!gadget)
return -EINVAL;
dev = container_of(gadget, struct pch_udc_dev, gadget);
spin_lock_irqsave(&dev->lock, flags);
pch_udc_rmt_wakeup(dev);
spin_unlock_irqrestore(&dev->lock, flags);
return 0;
}
/**
* pch_udc_pcd_selfpowered() - This API is invoked to specify whether the device
* is self powered or not
* @gadget: Reference to the gadget driver
* @value: Specifies self powered or not
*
* Return codes:
* 0: Success
* -EINVAL: If the gadget passed is NULL
*/
static int pch_udc_pcd_selfpowered(struct usb_gadget *gadget, int value)
{
struct pch_udc_dev *dev;
if (!gadget)
return -EINVAL;
gadget->is_selfpowered = (value != 0);
dev = container_of(gadget, struct pch_udc_dev, gadget);
if (value)
pch_udc_set_selfpowered(dev);
else
pch_udc_clear_selfpowered(dev);
return 0;
}
/**
* pch_udc_pcd_pullup() - This API is invoked to make the device
* visible/invisible to the host
* @gadget: Reference to the gadget driver
* @is_on: Specifies whether the pull up is made active or inactive
*
* Return codes:
* 0: Success
* -EINVAL: If the gadget passed is NULL
*/
static int pch_udc_pcd_pullup(struct usb_gadget *gadget, int is_on)
{
struct pch_udc_dev *dev;
unsigned long iflags;
if (!gadget)
return -EINVAL;
dev = container_of(gadget, struct pch_udc_dev, gadget);
spin_lock_irqsave(&dev->lock, iflags);
if (is_on) {
pch_udc_reconnect(dev);
} else {
if (dev->driver && dev->driver->disconnect) {
spin_unlock_irqrestore(&dev->lock, iflags);
dev->driver->disconnect(&dev->gadget);
spin_lock_irqsave(&dev->lock, iflags);
}
pch_udc_set_disconnect(dev);
}
spin_unlock_irqrestore(&dev->lock, iflags);
return 0;
}
/**
* pch_udc_pcd_vbus_session() - This API is used by a driver for an external
* transceiver (or GPIO) that
* detects a VBUS power session starting/ending
* @gadget: Reference to the gadget driver
* @is_active: specifies whether the session is starting or ending
*
* Return codes:
* 0: Success
* -EINVAL: If the gadget passed is NULL
*/
static int pch_udc_pcd_vbus_session(struct usb_gadget *gadget, int is_active)
{
struct pch_udc_dev *dev;
if (!gadget)
return -EINVAL;
dev = container_of(gadget, struct pch_udc_dev, gadget);
pch_udc_vbus_session(dev, is_active);
return 0;
}
/**
* pch_udc_pcd_vbus_draw() - This API is used by gadget drivers during
* SET_CONFIGURATION calls to
* specify how much power the device can consume
* @gadget: Reference to the gadget driver
* @mA: specifies the current limit in 2mA unit
*
* Return codes:
* -EINVAL: If the gadget passed is NULL
* -EOPNOTSUPP:
*/
static int pch_udc_pcd_vbus_draw(struct usb_gadget *gadget, unsigned int mA)
{
return -EOPNOTSUPP;
}
static int pch_udc_start(struct usb_gadget *g,
struct usb_gadget_driver *driver);
static int pch_udc_stop(struct usb_gadget *g);
static const struct usb_gadget_ops pch_udc_ops = {
.get_frame = pch_udc_pcd_get_frame,
.wakeup = pch_udc_pcd_wakeup,
.set_selfpowered = pch_udc_pcd_selfpowered,
.pullup = pch_udc_pcd_pullup,
.vbus_session = pch_udc_pcd_vbus_session,
.vbus_draw = pch_udc_pcd_vbus_draw,
.udc_start = pch_udc_start,
.udc_stop = pch_udc_stop,
};
/**
* pch_vbus_gpio_get_value() - This API gets value of GPIO port as VBUS status.
* @dev: Reference to the driver structure
*
* Return value:
* 1: VBUS is high
* 0: VBUS is low
* -1: It is not enable to detect VBUS using GPIO
*/
static int pch_vbus_gpio_get_value(struct pch_udc_dev *dev)
{
int vbus = 0;
if (dev->vbus_gpio.port)
vbus = gpiod_get_value(dev->vbus_gpio.port) ? 1 : 0;
else
vbus = -1;
return vbus;
}
/**
* pch_vbus_gpio_work_fall() - This API keeps watch on VBUS becoming Low.
* If VBUS is Low, disconnect is processed
* @irq_work: Structure for WorkQueue
*
*/
static void pch_vbus_gpio_work_fall(struct work_struct *irq_work)
{
struct pch_vbus_gpio_data *vbus_gpio = container_of(irq_work,
struct pch_vbus_gpio_data, irq_work_fall);
struct pch_udc_dev *dev =
container_of(vbus_gpio, struct pch_udc_dev, vbus_gpio);
int vbus_saved = -1;
int vbus;
int count;
if (!dev->vbus_gpio.port)
return;
for (count = 0; count < (PCH_VBUS_PERIOD / PCH_VBUS_INTERVAL);
count++) {
vbus = pch_vbus_gpio_get_value(dev);
if ((vbus_saved == vbus) && (vbus == 0)) {
dev_dbg(&dev->pdev->dev, "VBUS fell");
if (dev->driver
&& dev->driver->disconnect) {
dev->driver->disconnect(
&dev->gadget);
}
if (dev->vbus_gpio.intr)
pch_udc_init(dev);
else
pch_udc_reconnect(dev);
return;
}
vbus_saved = vbus;
mdelay(PCH_VBUS_INTERVAL);
}
}
/**
* pch_vbus_gpio_work_rise() - This API checks VBUS is High.
* If VBUS is High, connect is processed
* @irq_work: Structure for WorkQueue
*
*/
static void pch_vbus_gpio_work_rise(struct work_struct *irq_work)
{
struct pch_vbus_gpio_data *vbus_gpio = container_of(irq_work,
struct pch_vbus_gpio_data, irq_work_rise);
struct pch_udc_dev *dev =
container_of(vbus_gpio, struct pch_udc_dev, vbus_gpio);
int vbus;
if (!dev->vbus_gpio.port)
return;
mdelay(PCH_VBUS_INTERVAL);
vbus = pch_vbus_gpio_get_value(dev);
if (vbus == 1) {
dev_dbg(&dev->pdev->dev, "VBUS rose");
pch_udc_reconnect(dev);
return;
}
}
/**
* pch_vbus_gpio_irq() - IRQ handler for GPIO interrupt for changing VBUS
* @irq: Interrupt request number
* @data: Reference to the device structure
*
* Return codes:
* 0: Success
* -EINVAL: GPIO port is invalid or can't be initialized.
*/
static irqreturn_t pch_vbus_gpio_irq(int irq, void *data)
{
struct pch_udc_dev *dev = (struct pch_udc_dev *)data;
if (!dev->vbus_gpio.port || !dev->vbus_gpio.intr)
return IRQ_NONE;
if (pch_vbus_gpio_get_value(dev))
schedule_work(&dev->vbus_gpio.irq_work_rise);
else
schedule_work(&dev->vbus_gpio.irq_work_fall);
return IRQ_HANDLED;
}
/**
* pch_vbus_gpio_init() - This API initializes GPIO port detecting VBUS.
* @dev: Reference to the driver structure
*
* Return codes:
* 0: Success
* -EINVAL: GPIO port is invalid or can't be initialized.
*/
static int pch_vbus_gpio_init(struct pch_udc_dev *dev)
{
struct device *d = &dev->pdev->dev;
int err;
int irq_num = 0;
struct gpio_desc *gpiod;
dev->vbus_gpio.port = NULL;
dev->vbus_gpio.intr = 0;
/* Retrieve the GPIO line from the USB gadget device */
gpiod = devm_gpiod_get_optional(d, NULL, GPIOD_IN);
if (IS_ERR(gpiod))
return PTR_ERR(gpiod);
gpiod_set_consumer_name(gpiod, "pch_vbus");
dev->vbus_gpio.port = gpiod;
INIT_WORK(&dev->vbus_gpio.irq_work_fall, pch_vbus_gpio_work_fall);
irq_num = gpiod_to_irq(gpiod);
if (irq_num > 0) {
irq_set_irq_type(irq_num, IRQ_TYPE_EDGE_BOTH);
err = request_irq(irq_num, pch_vbus_gpio_irq, 0,
"vbus_detect", dev);
if (!err) {
dev->vbus_gpio.intr = irq_num;
INIT_WORK(&dev->vbus_gpio.irq_work_rise,
pch_vbus_gpio_work_rise);
} else {
pr_err("%s: can't request irq %d, err: %d\n",
__func__, irq_num, err);
}
}
return 0;
}
/**
* pch_vbus_gpio_free() - This API frees resources of GPIO port
* @dev: Reference to the driver structure
*/
static void pch_vbus_gpio_free(struct pch_udc_dev *dev)
{
if (dev->vbus_gpio.intr)
free_irq(dev->vbus_gpio.intr, dev);
}
/**
* complete_req() - This API is invoked from the driver when processing
* of a request is complete
* @ep: Reference to the endpoint structure
* @req: Reference to the request structure
* @status: Indicates the success/failure of completion
*/
static void complete_req(struct pch_udc_ep *ep, struct pch_udc_request *req,
int status)
__releases(&dev->lock)
__acquires(&dev->lock)
{
struct pch_udc_dev *dev;
unsigned halted = ep->halted;
list_del_init(&req->queue);
/* set new status if pending */
if (req->req.status == -EINPROGRESS)
req->req.status = status;
else
status = req->req.status;
dev = ep->dev;
usb_gadget_unmap_request(&dev->gadget, &req->req, ep->in);
ep->halted = 1;
spin_unlock(&dev->lock);
if (!ep->in)
pch_udc_ep_clear_rrdy(ep);
usb_gadget_giveback_request(&ep->ep, &req->req);
spin_lock(&dev->lock);
ep->halted = halted;
}
/**
* empty_req_queue() - This API empties the request queue of an endpoint
* @ep: Reference to the endpoint structure
*/
static void empty_req_queue(struct pch_udc_ep *ep)
{
struct pch_udc_request *req;
ep->halted = 1;
while (!list_empty(&ep->queue)) {
req = list_entry(ep->queue.next, struct pch_udc_request, queue);
complete_req(ep, req, -ESHUTDOWN); /* Remove from list */
}
}
/**
* pch_udc_free_dma_chain() - This function frees the DMA chain created
* for the request
* @dev: Reference to the driver structure
* @req: Reference to the request to be freed
*
* Return codes:
* 0: Success
*/
static void pch_udc_free_dma_chain(struct pch_udc_dev *dev,
struct pch_udc_request *req)
{
struct pch_udc_data_dma_desc *td = req->td_data;
unsigned i = req->chain_len;
dma_addr_t addr2;
dma_addr_t addr = (dma_addr_t)td->next;
td->next = 0x00;
for (; i > 1; --i) {
/* do not free first desc., will be done by free for request */
td = phys_to_virt(addr);
addr2 = (dma_addr_t)td->next;
dma_pool_free(dev->data_requests, td, addr);
addr = addr2;
}
req->chain_len = 1;
}
/**
* pch_udc_create_dma_chain() - This function creates or reinitializes
* a DMA chain
* @ep: Reference to the endpoint structure
* @req: Reference to the request
* @buf_len: The buffer length
* @gfp_flags: Flags to be used while mapping the data buffer
*
* Return codes:
* 0: success,
* -ENOMEM: dma_pool_alloc invocation fails
*/
static int pch_udc_create_dma_chain(struct pch_udc_ep *ep,
struct pch_udc_request *req,
unsigned long buf_len,
gfp_t gfp_flags)
{
struct pch_udc_data_dma_desc *td = req->td_data, *last;
unsigned long bytes = req->req.length, i = 0;
dma_addr_t dma_addr;
unsigned len = 1;
if (req->chain_len > 1)
pch_udc_free_dma_chain(ep->dev, req);
td->dataptr = req->req.dma;
td->status = PCH_UDC_BS_HST_BSY;
for (; ; bytes -= buf_len, ++len) {
td->status = PCH_UDC_BS_HST_BSY | min(buf_len, bytes);
if (bytes <= buf_len)
break;
last = td;
td = dma_pool_alloc(ep->dev->data_requests, gfp_flags,
&dma_addr);
if (!td)
goto nomem;
i += buf_len;
td->dataptr = req->td_data->dataptr + i;
last->next = dma_addr;
}
req->td_data_last = td;
td->status |= PCH_UDC_DMA_LAST;
td->next = req->td_data_phys;
req->chain_len = len;
return 0;
nomem:
if (len > 1) {
req->chain_len = len;
pch_udc_free_dma_chain(ep->dev, req);
}
req->chain_len = 1;
return -ENOMEM;
}
/**
* prepare_dma() - This function creates and initializes the DMA chain
* for the request
* @ep: Reference to the endpoint structure
* @req: Reference to the request
* @gfp: Flag to be used while mapping the data buffer
*
* Return codes:
* 0: Success
* Other 0: linux error number on failure
*/
static int prepare_dma(struct pch_udc_ep *ep, struct pch_udc_request *req,
gfp_t gfp)
{
int retval;
/* Allocate and create a DMA chain */
retval = pch_udc_create_dma_chain(ep, req, ep->ep.maxpacket, gfp);
if (retval) {
pr_err("%s: could not create DMA chain:%d\n", __func__, retval);
return retval;
}
if (ep->in)
req->td_data->status = (req->td_data->status &
~PCH_UDC_BUFF_STS) | PCH_UDC_BS_HST_RDY;
return 0;
}
/**
* process_zlp() - This function process zero length packets
* from the gadget driver
* @ep: Reference to the endpoint structure
* @req: Reference to the request
*/
static void process_zlp(struct pch_udc_ep *ep, struct pch_udc_request *req)
{
struct pch_udc_dev *dev = ep->dev;
/* IN zlp's are handled by hardware */
complete_req(ep, req, 0);
/* if set_config or set_intf is waiting for ack by zlp
* then set CSR_DONE
*/
if (dev->set_cfg_not_acked) {
pch_udc_set_csr_done(dev);
dev->set_cfg_not_acked = 0;
}
/* setup command is ACK'ed now by zlp */
if (!dev->stall && dev->waiting_zlp_ack) {
pch_udc_ep_clear_nak(&(dev->ep[UDC_EP0IN_IDX]));
dev->waiting_zlp_ack = 0;
}
}
/**
* pch_udc_start_rxrequest() - This function starts the receive requirement.
* @ep: Reference to the endpoint structure
* @req: Reference to the request structure
*/
static void pch_udc_start_rxrequest(struct pch_udc_ep *ep,
struct pch_udc_request *req)
{
struct pch_udc_data_dma_desc *td_data;
pch_udc_clear_dma(ep->dev, DMA_DIR_RX);
td_data = req->td_data;
/* Set the status bits for all descriptors */
while (1) {
td_data->status = (td_data->status & ~PCH_UDC_BUFF_STS) |
PCH_UDC_BS_HST_RDY;
if ((td_data->status & PCH_UDC_DMA_LAST) == PCH_UDC_DMA_LAST)
break;
td_data = phys_to_virt(td_data->next);
}
/* Write the descriptor pointer */
pch_udc_ep_set_ddptr(ep, req->td_data_phys);
req->dma_going = 1;
pch_udc_enable_ep_interrupts(ep->dev, UDC_EPINT_OUT_EP0 << ep->num);
pch_udc_set_dma(ep->dev, DMA_DIR_RX);
pch_udc_ep_clear_nak(ep);
pch_udc_ep_set_rrdy(ep);
}
/**
* pch_udc_pcd_ep_enable() - This API enables the endpoint. It is called
* from gadget driver
* @usbep: Reference to the USB endpoint structure
* @desc: Reference to the USB endpoint descriptor structure
*
* Return codes:
* 0: Success
* -EINVAL:
* -ESHUTDOWN:
*/
static int pch_udc_pcd_ep_enable(struct usb_ep *usbep,
const struct usb_endpoint_descriptor *desc)
{
struct pch_udc_ep *ep;
struct pch_udc_dev *dev;
unsigned long iflags;
if (!usbep || (usbep->name == ep0_string) || !desc ||
(desc->bDescriptorType != USB_DT_ENDPOINT) || !desc->wMaxPacketSize)
return -EINVAL;
ep = container_of(usbep, struct pch_udc_ep, ep);
dev = ep->dev;
if (!dev->driver || (dev->gadget.speed == USB_SPEED_UNKNOWN))
return -ESHUTDOWN;
spin_lock_irqsave(&dev->lock, iflags);
ep->ep.desc = desc;
ep->halted = 0;
pch_udc_ep_enable(ep, &ep->dev->cfg_data, desc);
ep->ep.maxpacket = usb_endpoint_maxp(desc);
pch_udc_enable_ep_interrupts(ep->dev, PCH_UDC_EPINT(ep->in, ep->num));
spin_unlock_irqrestore(&dev->lock, iflags);
return 0;
}
/**
* pch_udc_pcd_ep_disable() - This API disables endpoint and is called
* from gadget driver
* @usbep: Reference to the USB endpoint structure
*
* Return codes:
* 0: Success
* -EINVAL:
*/
static int pch_udc_pcd_ep_disable(struct usb_ep *usbep)
{
struct pch_udc_ep *ep;
unsigned long iflags;
if (!usbep)
return -EINVAL;
ep = container_of(usbep, struct pch_udc_ep, ep);
if ((usbep->name == ep0_string) || !ep->ep.desc)
return -EINVAL;
spin_lock_irqsave(&ep->dev->lock, iflags);
empty_req_queue(ep);
ep->halted = 1;
pch_udc_ep_disable(ep);
pch_udc_disable_ep_interrupts(ep->dev, PCH_UDC_EPINT(ep->in, ep->num));
ep->ep.desc = NULL;
INIT_LIST_HEAD(&ep->queue);
spin_unlock_irqrestore(&ep->dev->lock, iflags);
return 0;
}
/**
* pch_udc_alloc_request() - This function allocates request structure.
* It is called by gadget driver
* @usbep: Reference to the USB endpoint structure
* @gfp: Flag to be used while allocating memory
*
* Return codes:
* NULL: Failure
* Allocated address: Success
*/
static struct usb_request *pch_udc_alloc_request(struct usb_ep *usbep,
gfp_t gfp)
{
struct pch_udc_request *req;
struct pch_udc_ep *ep;
struct pch_udc_data_dma_desc *dma_desc;
if (!usbep)
return NULL;
ep = container_of(usbep, struct pch_udc_ep, ep);
req = kzalloc(sizeof *req, gfp);
if (!req)
return NULL;
req->req.dma = DMA_ADDR_INVALID;
INIT_LIST_HEAD(&req->queue);
if (!ep->dev->dma_addr)
return &req->req;
/* ep0 in requests are allocated from data pool here */
dma_desc = dma_pool_alloc(ep->dev->data_requests, gfp,
&req->td_data_phys);
if (NULL == dma_desc) {
kfree(req);
return NULL;
}
/* prevent from using desc. - set HOST BUSY */
dma_desc->status |= PCH_UDC_BS_HST_BSY;
dma_desc->dataptr = lower_32_bits(DMA_ADDR_INVALID);
req->td_data = dma_desc;
req->td_data_last = dma_desc;
req->chain_len = 1;
return &req->req;
}
/**
* pch_udc_free_request() - This function frees request structure.
* It is called by gadget driver
* @usbep: Reference to the USB endpoint structure
* @usbreq: Reference to the USB request
*/
static void pch_udc_free_request(struct usb_ep *usbep,
struct usb_request *usbreq)
{
struct pch_udc_ep *ep;
struct pch_udc_request *req;
struct pch_udc_dev *dev;
if (!usbep || !usbreq)
return;
ep = container_of(usbep, struct pch_udc_ep, ep);
req = container_of(usbreq, struct pch_udc_request, req);
dev = ep->dev;
if (!list_empty(&req->queue))
dev_err(&dev->pdev->dev, "%s: %s req=0x%p queue not empty\n",
__func__, usbep->name, req);
if (req->td_data != NULL) {
if (req->chain_len > 1)
pch_udc_free_dma_chain(ep->dev, req);
dma_pool_free(ep->dev->data_requests, req->td_data,
req->td_data_phys);
}
kfree(req);
}
/**
* pch_udc_pcd_queue() - This function queues a request packet. It is called
* by gadget driver
* @usbep: Reference to the USB endpoint structure
* @usbreq: Reference to the USB request
* @gfp: Flag to be used while mapping the data buffer
*
* Return codes:
* 0: Success
* linux error number: Failure
*/
static int pch_udc_pcd_queue(struct usb_ep *usbep, struct usb_request *usbreq,
gfp_t gfp)
{
int retval = 0;
struct pch_udc_ep *ep;
struct pch_udc_dev *dev;
struct pch_udc_request *req;
unsigned long iflags;
if (!usbep || !usbreq || !usbreq->complete || !usbreq->buf)
return -EINVAL;
ep = container_of(usbep, struct pch_udc_ep, ep);
dev = ep->dev;
if (!ep->ep.desc && ep->num)
return -EINVAL;
req = container_of(usbreq, struct pch_udc_request, req);
if (!list_empty(&req->queue))
return -EINVAL;
if (!dev->driver || (dev->gadget.speed == USB_SPEED_UNKNOWN))
return -ESHUTDOWN;
spin_lock_irqsave(&dev->lock, iflags);
/* map the buffer for dma */
retval = usb_gadget_map_request(&dev->gadget, usbreq, ep->in);
if (retval)
goto probe_end;
if (usbreq->length > 0) {
retval = prepare_dma(ep, req, GFP_ATOMIC);
if (retval)
goto probe_end;
}
usbreq->actual = 0;
usbreq->status = -EINPROGRESS;
req->dma_done = 0;
if (list_empty(&ep->queue) && !ep->halted) {
/* no pending transfer, so start this req */
if (!usbreq->length) {
process_zlp(ep, req);
retval = 0;
goto probe_end;
}
if (!ep->in) {
pch_udc_start_rxrequest(ep, req);
} else {
/*
* For IN trfr the descriptors will be programmed and
* P bit will be set when
* we get an IN token
*/
pch_udc_wait_ep_stall(ep);
pch_udc_ep_clear_nak(ep);
pch_udc_enable_ep_interrupts(ep->dev, (1 << ep->num));
}
}
/* Now add this request to the ep's pending requests */
if (req != NULL)
list_add_tail(&req->queue, &ep->queue);
probe_end:
spin_unlock_irqrestore(&dev->lock, iflags);
return retval;
}
/**
* pch_udc_pcd_dequeue() - This function de-queues a request packet.
* It is called by gadget driver
* @usbep: Reference to the USB endpoint structure
* @usbreq: Reference to the USB request
*
* Return codes:
* 0: Success
* linux error number: Failure
*/
static int pch_udc_pcd_dequeue(struct usb_ep *usbep,
struct usb_request *usbreq)
{
struct pch_udc_ep *ep;
struct pch_udc_request *req;
unsigned long flags;
int ret = -EINVAL;
ep = container_of(usbep, struct pch_udc_ep, ep);
if (!usbep || !usbreq || (!ep->ep.desc && ep->num))
return ret;
req = container_of(usbreq, struct pch_udc_request, req);
spin_lock_irqsave(&ep->dev->lock, flags);
/* make sure it's still queued on this endpoint */
list_for_each_entry(req, &ep->queue, queue) {
if (&req->req == usbreq) {
pch_udc_ep_set_nak(ep);
if (!list_empty(&req->queue))
complete_req(ep, req, -ECONNRESET);
ret = 0;
break;
}
}
spin_unlock_irqrestore(&ep->dev->lock, flags);
return ret;
}
/**
* pch_udc_pcd_set_halt() - This function Sets or clear the endpoint halt
* feature
* @usbep: Reference to the USB endpoint structure
* @halt: Specifies whether to set or clear the feature
*
* Return codes:
* 0: Success
* linux error number: Failure
*/
static int pch_udc_pcd_set_halt(struct usb_ep *usbep, int halt)
{
struct pch_udc_ep *ep;
unsigned long iflags;
int ret;
if (!usbep)
return -EINVAL;
ep = container_of(usbep, struct pch_udc_ep, ep);
if (!ep->ep.desc && !ep->num)
return -EINVAL;
if (!ep->dev->driver || (ep->dev->gadget.speed == USB_SPEED_UNKNOWN))
return -ESHUTDOWN;
spin_lock_irqsave(&udc_stall_spinlock, iflags);
if (list_empty(&ep->queue)) {
if (halt) {
if (ep->num == PCH_UDC_EP0)
ep->dev->stall = 1;
pch_udc_ep_set_stall(ep);
pch_udc_enable_ep_interrupts(
ep->dev, PCH_UDC_EPINT(ep->in, ep->num));
} else {
pch_udc_ep_clear_stall(ep);
}
ret = 0;
} else {
ret = -EAGAIN;
}
spin_unlock_irqrestore(&udc_stall_spinlock, iflags);
return ret;
}
/**
* pch_udc_pcd_set_wedge() - This function Sets or clear the endpoint
* halt feature
* @usbep: Reference to the USB endpoint structure
*
* Return codes:
* 0: Success
* linux error number: Failure
*/
static int pch_udc_pcd_set_wedge(struct usb_ep *usbep)
{
struct pch_udc_ep *ep;
unsigned long iflags;
int ret;
if (!usbep)
return -EINVAL;
ep = container_of(usbep, struct pch_udc_ep, ep);
if (!ep->ep.desc && !ep->num)
return -EINVAL;
if (!ep->dev->driver || (ep->dev->gadget.speed == USB_SPEED_UNKNOWN))
return -ESHUTDOWN;
spin_lock_irqsave(&udc_stall_spinlock, iflags);
if (!list_empty(&ep->queue)) {
ret = -EAGAIN;
} else {
if (ep->num == PCH_UDC_EP0)
ep->dev->stall = 1;
pch_udc_ep_set_stall(ep);
pch_udc_enable_ep_interrupts(ep->dev,
PCH_UDC_EPINT(ep->in, ep->num));
ep->dev->prot_stall = 1;
ret = 0;
}
spin_unlock_irqrestore(&udc_stall_spinlock, iflags);
return ret;
}
/**
* pch_udc_pcd_fifo_flush() - This function Flush the FIFO of specified endpoint
* @usbep: Reference to the USB endpoint structure
*/
static void pch_udc_pcd_fifo_flush(struct usb_ep *usbep)
{
struct pch_udc_ep *ep;
if (!usbep)
return;
ep = container_of(usbep, struct pch_udc_ep, ep);
if (ep->ep.desc || !ep->num)
pch_udc_ep_fifo_flush(ep, ep->in);
}
static const struct usb_ep_ops pch_udc_ep_ops = {
.enable = pch_udc_pcd_ep_enable,
.disable = pch_udc_pcd_ep_disable,
.alloc_request = pch_udc_alloc_request,
.free_request = pch_udc_free_request,
.queue = pch_udc_pcd_queue,
.dequeue = pch_udc_pcd_dequeue,
.set_halt = pch_udc_pcd_set_halt,
.set_wedge = pch_udc_pcd_set_wedge,
.fifo_status = NULL,
.fifo_flush = pch_udc_pcd_fifo_flush,
};
/**
* pch_udc_init_setup_buff() - This function initializes the SETUP buffer
* @td_stp: Reference to the SETP buffer structure
*/
static void pch_udc_init_setup_buff(struct pch_udc_stp_dma_desc *td_stp)
{
static u32 pky_marker;
if (!td_stp)
return;
td_stp->reserved = ++pky_marker;
memset(&td_stp->request, 0xFF, sizeof td_stp->request);
td_stp->status = PCH_UDC_BS_HST_RDY;
}
/**
* pch_udc_start_next_txrequest() - This function starts
* the next transmission requirement
* @ep: Reference to the endpoint structure
*/
static void pch_udc_start_next_txrequest(struct pch_udc_ep *ep)
{
struct pch_udc_request *req;
struct pch_udc_data_dma_desc *td_data;
if (pch_udc_read_ep_control(ep) & UDC_EPCTL_P)
return;
if (list_empty(&ep->queue))
return;
/* next request */
req = list_entry(ep->queue.next, struct pch_udc_request, queue);
if (req->dma_going)
return;
if (!req->td_data)
return;
pch_udc_wait_ep_stall(ep);
req->dma_going = 1;
pch_udc_ep_set_ddptr(ep, 0);
td_data = req->td_data;
while (1) {
td_data->status = (td_data->status & ~PCH_UDC_BUFF_STS) |
PCH_UDC_BS_HST_RDY;
if ((td_data->status & PCH_UDC_DMA_LAST) == PCH_UDC_DMA_LAST)
break;
td_data = phys_to_virt(td_data->next);
}
pch_udc_ep_set_ddptr(ep, req->td_data_phys);
pch_udc_set_dma(ep->dev, DMA_DIR_TX);
pch_udc_ep_set_pd(ep);
pch_udc_enable_ep_interrupts(ep->dev, PCH_UDC_EPINT(ep->in, ep->num));
pch_udc_ep_clear_nak(ep);
}
/**
* pch_udc_complete_transfer() - This function completes a transfer
* @ep: Reference to the endpoint structure
*/
static void pch_udc_complete_transfer(struct pch_udc_ep *ep)
{
struct pch_udc_request *req;
struct pch_udc_dev *dev = ep->dev;
if (list_empty(&ep->queue))
return;
req = list_entry(ep->queue.next, struct pch_udc_request, queue);
if ((req->td_data_last->status & PCH_UDC_BUFF_STS) !=
PCH_UDC_BS_DMA_DONE)
return;
if ((req->td_data_last->status & PCH_UDC_RXTX_STS) !=
PCH_UDC_RTS_SUCC) {
dev_err(&dev->pdev->dev, "Invalid RXTX status (0x%08x) "
"epstatus=0x%08x\n",
(req->td_data_last->status & PCH_UDC_RXTX_STS),
(int)(ep->epsts));
return;
}
req->req.actual = req->req.length;
req->td_data_last->status = PCH_UDC_BS_HST_BSY | PCH_UDC_DMA_LAST;
req->td_data->status = PCH_UDC_BS_HST_BSY | PCH_UDC_DMA_LAST;
complete_req(ep, req, 0);
req->dma_going = 0;
if (!list_empty(&ep->queue)) {
pch_udc_wait_ep_stall(ep);
pch_udc_ep_clear_nak(ep);
pch_udc_enable_ep_interrupts(ep->dev,
PCH_UDC_EPINT(ep->in, ep->num));
} else {
pch_udc_disable_ep_interrupts(ep->dev,
PCH_UDC_EPINT(ep->in, ep->num));
}
}
/**
* pch_udc_complete_receiver() - This function completes a receiver
* @ep: Reference to the endpoint structure
*/
static void pch_udc_complete_receiver(struct pch_udc_ep *ep)
{
struct pch_udc_request *req;
struct pch_udc_dev *dev = ep->dev;
unsigned int count;
struct pch_udc_data_dma_desc *td;
dma_addr_t addr;
if (list_empty(&ep->queue))
return;
/* next request */
req = list_entry(ep->queue.next, struct pch_udc_request, queue);
pch_udc_clear_dma(ep->dev, DMA_DIR_RX);
pch_udc_ep_set_ddptr(ep, 0);
if ((req->td_data_last->status & PCH_UDC_BUFF_STS) ==
PCH_UDC_BS_DMA_DONE)
td = req->td_data_last;
else
td = req->td_data;
while (1) {
if ((td->status & PCH_UDC_RXTX_STS) != PCH_UDC_RTS_SUCC) {
dev_err(&dev->pdev->dev, "Invalid RXTX status=0x%08x "
"epstatus=0x%08x\n",
(req->td_data->status & PCH_UDC_RXTX_STS),
(int)(ep->epsts));
return;
}
if ((td->status & PCH_UDC_BUFF_STS) == PCH_UDC_BS_DMA_DONE)
if (td->status & PCH_UDC_DMA_LAST) {
count = td->status & PCH_UDC_RXTX_BYTES;
break;
}
if (td == req->td_data_last) {
dev_err(&dev->pdev->dev, "Not complete RX descriptor");
return;
}
addr = (dma_addr_t)td->next;
td = phys_to_virt(addr);
}
/* on 64k packets the RXBYTES field is zero */
if (!count && (req->req.length == UDC_DMA_MAXPACKET))
count = UDC_DMA_MAXPACKET;
req->td_data->status |= PCH_UDC_DMA_LAST;
td->status |= PCH_UDC_BS_HST_BSY;
req->dma_going = 0;
req->req.actual = count;
complete_req(ep, req, 0);
/* If there is a new/failed requests try that now */
if (!list_empty(&ep->queue)) {
req = list_entry(ep->queue.next, struct pch_udc_request, queue);
pch_udc_start_rxrequest(ep, req);
}
}
/**
* pch_udc_svc_data_in() - This function process endpoint interrupts
* for IN endpoints
* @dev: Reference to the device structure
* @ep_num: Endpoint that generated the interrupt
*/
static void pch_udc_svc_data_in(struct pch_udc_dev *dev, int ep_num)
{
u32 epsts;
struct pch_udc_ep *ep;
ep = &dev->ep[UDC_EPIN_IDX(ep_num)];
epsts = ep->epsts;
ep->epsts = 0;
if (!(epsts & (UDC_EPSTS_IN | UDC_EPSTS_BNA | UDC_EPSTS_HE |
UDC_EPSTS_TDC | UDC_EPSTS_RCS | UDC_EPSTS_TXEMPTY |
UDC_EPSTS_RSS | UDC_EPSTS_XFERDONE)))
return;
if ((epsts & UDC_EPSTS_BNA))
return;
if (epsts & UDC_EPSTS_HE)
return;
if (epsts & UDC_EPSTS_RSS) {
pch_udc_ep_set_stall(ep);
pch_udc_enable_ep_interrupts(ep->dev,
PCH_UDC_EPINT(ep->in, ep->num));
}
if (epsts & UDC_EPSTS_RCS) {
if (!dev->prot_stall) {
pch_udc_ep_clear_stall(ep);
} else {
pch_udc_ep_set_stall(ep);
pch_udc_enable_ep_interrupts(ep->dev,
PCH_UDC_EPINT(ep->in, ep->num));
}
}
if (epsts & UDC_EPSTS_TDC)
pch_udc_complete_transfer(ep);
/* On IN interrupt, provide data if we have any */
if ((epsts & UDC_EPSTS_IN) && !(epsts & UDC_EPSTS_RSS) &&
!(epsts & UDC_EPSTS_TDC) && !(epsts & UDC_EPSTS_TXEMPTY))
pch_udc_start_next_txrequest(ep);
}
/**
* pch_udc_svc_data_out() - Handles interrupts from OUT endpoint
* @dev: Reference to the device structure
* @ep_num: Endpoint that generated the interrupt
*/
static void pch_udc_svc_data_out(struct pch_udc_dev *dev, int ep_num)
{
u32 epsts;
struct pch_udc_ep *ep;
struct pch_udc_request *req = NULL;
ep = &dev->ep[UDC_EPOUT_IDX(ep_num)];
epsts = ep->epsts;
ep->epsts = 0;
if ((epsts & UDC_EPSTS_BNA) && (!list_empty(&ep->queue))) {
/* next request */
req = list_entry(ep->queue.next, struct pch_udc_request,
queue);
if ((req->td_data_last->status & PCH_UDC_BUFF_STS) !=
PCH_UDC_BS_DMA_DONE) {
if (!req->dma_going)
pch_udc_start_rxrequest(ep, req);
return;
}
}
if (epsts & UDC_EPSTS_HE)
return;
if (epsts & UDC_EPSTS_RSS) {
pch_udc_ep_set_stall(ep);
pch_udc_enable_ep_interrupts(ep->dev,
PCH_UDC_EPINT(ep->in, ep->num));
}
if (epsts & UDC_EPSTS_RCS) {
if (!dev->prot_stall) {
pch_udc_ep_clear_stall(ep);
} else {
pch_udc_ep_set_stall(ep);
pch_udc_enable_ep_interrupts(ep->dev,
PCH_UDC_EPINT(ep->in, ep->num));
}
}
if (((epsts & UDC_EPSTS_OUT_MASK) >> UDC_EPSTS_OUT_SHIFT) ==
UDC_EPSTS_OUT_DATA) {
if (ep->dev->prot_stall == 1) {
pch_udc_ep_set_stall(ep);
pch_udc_enable_ep_interrupts(ep->dev,
PCH_UDC_EPINT(ep->in, ep->num));
} else {
pch_udc_complete_receiver(ep);
}
}
if (list_empty(&ep->queue))
pch_udc_set_dma(dev, DMA_DIR_RX);
}
static int pch_udc_gadget_setup(struct pch_udc_dev *dev)
__must_hold(&dev->lock)
{
int rc;
/* In some cases we can get an interrupt before driver gets setup */
if (!dev->driver)
return -ESHUTDOWN;
spin_unlock(&dev->lock);
rc = dev->driver->setup(&dev->gadget, &dev->setup_data);
spin_lock(&dev->lock);
return rc;
}
/**
* pch_udc_svc_control_in() - Handle Control IN endpoint interrupts
* @dev: Reference to the device structure
*/
static void pch_udc_svc_control_in(struct pch_udc_dev *dev)
{
u32 epsts;
struct pch_udc_ep *ep;
struct pch_udc_ep *ep_out;
ep = &dev->ep[UDC_EP0IN_IDX];
ep_out = &dev->ep[UDC_EP0OUT_IDX];
epsts = ep->epsts;
ep->epsts = 0;
if (!(epsts & (UDC_EPSTS_IN | UDC_EPSTS_BNA | UDC_EPSTS_HE |
UDC_EPSTS_TDC | UDC_EPSTS_RCS | UDC_EPSTS_TXEMPTY |
UDC_EPSTS_XFERDONE)))
return;
if ((epsts & UDC_EPSTS_BNA))
return;
if (epsts & UDC_EPSTS_HE)
return;
if ((epsts & UDC_EPSTS_TDC) && (!dev->stall)) {
pch_udc_complete_transfer(ep);
pch_udc_clear_dma(dev, DMA_DIR_RX);
ep_out->td_data->status = (ep_out->td_data->status &
~PCH_UDC_BUFF_STS) |
PCH_UDC_BS_HST_RDY;
pch_udc_ep_clear_nak(ep_out);
pch_udc_set_dma(dev, DMA_DIR_RX);
pch_udc_ep_set_rrdy(ep_out);
}
/* On IN interrupt, provide data if we have any */
if ((epsts & UDC_EPSTS_IN) && !(epsts & UDC_EPSTS_TDC) &&
!(epsts & UDC_EPSTS_TXEMPTY))
pch_udc_start_next_txrequest(ep);
}
/**
* pch_udc_svc_control_out() - Routine that handle Control
* OUT endpoint interrupts
* @dev: Reference to the device structure
*/
static void pch_udc_svc_control_out(struct pch_udc_dev *dev)
__releases(&dev->lock)
__acquires(&dev->lock)
{
u32 stat;
int setup_supported;
struct pch_udc_ep *ep;
ep = &dev->ep[UDC_EP0OUT_IDX];
stat = ep->epsts;
ep->epsts = 0;
/* If setup data */
if (((stat & UDC_EPSTS_OUT_MASK) >> UDC_EPSTS_OUT_SHIFT) ==
UDC_EPSTS_OUT_SETUP) {
dev->stall = 0;
dev->ep[UDC_EP0IN_IDX].halted = 0;
dev->ep[UDC_EP0OUT_IDX].halted = 0;
dev->setup_data = ep->td_stp->request;
pch_udc_init_setup_buff(ep->td_stp);
pch_udc_clear_dma(dev, DMA_DIR_RX);
pch_udc_ep_fifo_flush(&(dev->ep[UDC_EP0IN_IDX]),
dev->ep[UDC_EP0IN_IDX].in);
if ((dev->setup_data.bRequestType & USB_DIR_IN))
dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IDX].ep;
else /* OUT */
dev->gadget.ep0 = &ep->ep;
/* If Mass storage Reset */
if ((dev->setup_data.bRequestType == 0x21) &&
(dev->setup_data.bRequest == 0xFF))
dev->prot_stall = 0;
/* call gadget with setup data received */
setup_supported = pch_udc_gadget_setup(dev);
if (dev->setup_data.bRequestType & USB_DIR_IN) {
ep->td_data->status = (ep->td_data->status &
~PCH_UDC_BUFF_STS) |
PCH_UDC_BS_HST_RDY;
pch_udc_ep_set_ddptr(ep, ep->td_data_phys);
}
/* ep0 in returns data on IN phase */
if (setup_supported >= 0 && setup_supported <
UDC_EP0IN_MAX_PKT_SIZE) {
pch_udc_ep_clear_nak(&(dev->ep[UDC_EP0IN_IDX]));
/* Gadget would have queued a request when
* we called the setup */
if (!(dev->setup_data.bRequestType & USB_DIR_IN)) {
pch_udc_set_dma(dev, DMA_DIR_RX);
pch_udc_ep_clear_nak(ep);
}
} else if (setup_supported < 0) {
/* if unsupported request, then stall */
pch_udc_ep_set_stall(&(dev->ep[UDC_EP0IN_IDX]));
pch_udc_enable_ep_interrupts(ep->dev,
PCH_UDC_EPINT(ep->in, ep->num));
dev->stall = 0;
pch_udc_set_dma(dev, DMA_DIR_RX);
} else {
dev->waiting_zlp_ack = 1;
}
} else if ((((stat & UDC_EPSTS_OUT_MASK) >> UDC_EPSTS_OUT_SHIFT) ==
UDC_EPSTS_OUT_DATA) && !dev->stall) {
pch_udc_clear_dma(dev, DMA_DIR_RX);
pch_udc_ep_set_ddptr(ep, 0);
if (!list_empty(&ep->queue)) {
ep->epsts = stat;
pch_udc_svc_data_out(dev, PCH_UDC_EP0);
}
pch_udc_set_dma(dev, DMA_DIR_RX);
}
pch_udc_ep_set_rrdy(ep);
}
/**
* pch_udc_postsvc_epinters() - This function enables end point interrupts
* and clears NAK status
* @dev: Reference to the device structure
* @ep_num: End point number
*/
static void pch_udc_postsvc_epinters(struct pch_udc_dev *dev, int ep_num)
{
struct pch_udc_ep *ep = &dev->ep[UDC_EPIN_IDX(ep_num)];
if (list_empty(&ep->queue))
return;
pch_udc_enable_ep_interrupts(ep->dev, PCH_UDC_EPINT(ep->in, ep->num));
pch_udc_ep_clear_nak(ep);
}
/**
* pch_udc_read_all_epstatus() - This function read all endpoint status
* @dev: Reference to the device structure
* @ep_intr: Status of endpoint interrupt
*/
static void pch_udc_read_all_epstatus(struct pch_udc_dev *dev, u32 ep_intr)
{
int i;
struct pch_udc_ep *ep;
for (i = 0; i < PCH_UDC_USED_EP_NUM; i++) {
/* IN */
if (ep_intr & (0x1 << i)) {
ep = &dev->ep[UDC_EPIN_IDX(i)];
ep->epsts = pch_udc_read_ep_status(ep);
pch_udc_clear_ep_status(ep, ep->epsts);
}
/* OUT */
if (ep_intr & (0x10000 << i)) {
ep = &dev->ep[UDC_EPOUT_IDX(i)];
ep->epsts = pch_udc_read_ep_status(ep);
pch_udc_clear_ep_status(ep, ep->epsts);
}
}
}
/**
* pch_udc_activate_control_ep() - This function enables the control endpoints
* for traffic after a reset
* @dev: Reference to the device structure
*/
static void pch_udc_activate_control_ep(struct pch_udc_dev *dev)
{
struct pch_udc_ep *ep;
u32 val;
/* Setup the IN endpoint */
ep = &dev->ep[UDC_EP0IN_IDX];
pch_udc_clear_ep_control(ep);
pch_udc_ep_fifo_flush(ep, ep->in);
pch_udc_ep_set_bufsz(ep, UDC_EP0IN_BUFF_SIZE, ep->in);
pch_udc_ep_set_maxpkt(ep, UDC_EP0IN_MAX_PKT_SIZE);
/* Initialize the IN EP Descriptor */
ep->td_data = NULL;
ep->td_stp = NULL;
ep->td_data_phys = 0;
ep->td_stp_phys = 0;
/* Setup the OUT endpoint */
ep = &dev->ep[UDC_EP0OUT_IDX];
pch_udc_clear_ep_control(ep);
pch_udc_ep_fifo_flush(ep, ep->in);
pch_udc_ep_set_bufsz(ep, UDC_EP0OUT_BUFF_SIZE, ep->in);
pch_udc_ep_set_maxpkt(ep, UDC_EP0OUT_MAX_PKT_SIZE);
val = UDC_EP0OUT_MAX_PKT_SIZE << UDC_CSR_NE_MAX_PKT_SHIFT;
pch_udc_write_csr(ep->dev, val, UDC_EP0OUT_IDX);
/* Initialize the SETUP buffer */
pch_udc_init_setup_buff(ep->td_stp);
/* Write the pointer address of dma descriptor */
pch_udc_ep_set_subptr(ep, ep->td_stp_phys);
/* Write the pointer address of Setup descriptor */
pch_udc_ep_set_ddptr(ep, ep->td_data_phys);
/* Initialize the dma descriptor */
ep->td_data->status = PCH_UDC_DMA_LAST;
ep->td_data->dataptr = dev->dma_addr;
ep->td_data->next = ep->td_data_phys;
pch_udc_ep_clear_nak(ep);
}
/**
* pch_udc_svc_ur_interrupt() - This function handles a USB reset interrupt
* @dev: Reference to driver structure
*/
static void pch_udc_svc_ur_interrupt(struct pch_udc_dev *dev)
{
struct pch_udc_ep *ep;
int i;
pch_udc_clear_dma(dev, DMA_DIR_TX);
pch_udc_clear_dma(dev, DMA_DIR_RX);
/* Mask all endpoint interrupts */
pch_udc_disable_ep_interrupts(dev, UDC_EPINT_MSK_DISABLE_ALL);
/* clear all endpoint interrupts */
pch_udc_write_ep_interrupts(dev, UDC_EPINT_MSK_DISABLE_ALL);
for (i = 0; i < PCH_UDC_EP_NUM; i++) {
ep = &dev->ep[i];
pch_udc_clear_ep_status(ep, UDC_EPSTS_ALL_CLR_MASK);
pch_udc_clear_ep_control(ep);
pch_udc_ep_set_ddptr(ep, 0);
pch_udc_write_csr(ep->dev, 0x00, i);
}
dev->stall = 0;
dev->prot_stall = 0;
dev->waiting_zlp_ack = 0;
dev->set_cfg_not_acked = 0;
/* disable ep to empty req queue. Skip the control EP's */
for (i = 0; i < (PCH_UDC_USED_EP_NUM*2); i++) {
ep = &dev->ep[i];
pch_udc_ep_set_nak(ep);
pch_udc_ep_fifo_flush(ep, ep->in);
/* Complete request queue */
empty_req_queue(ep);
}
if (dev->driver) {
spin_unlock(&dev->lock);
usb_gadget_udc_reset(&dev->gadget, dev->driver);
spin_lock(&dev->lock);
}
}
/**
* pch_udc_svc_enum_interrupt() - This function handles a USB speed enumeration
* done interrupt
* @dev: Reference to driver structure
*/
static void pch_udc_svc_enum_interrupt(struct pch_udc_dev *dev)
{
u32 dev_stat, dev_speed;
u32 speed = USB_SPEED_FULL;
dev_stat = pch_udc_read_device_status(dev);
dev_speed = (dev_stat & UDC_DEVSTS_ENUM_SPEED_MASK) >>
UDC_DEVSTS_ENUM_SPEED_SHIFT;
switch (dev_speed) {
case UDC_DEVSTS_ENUM_SPEED_HIGH:
speed = USB_SPEED_HIGH;
break;
case UDC_DEVSTS_ENUM_SPEED_FULL:
speed = USB_SPEED_FULL;
break;
case UDC_DEVSTS_ENUM_SPEED_LOW:
speed = USB_SPEED_LOW;
break;
default:
BUG();
}
dev->gadget.speed = speed;
pch_udc_activate_control_ep(dev);
pch_udc_enable_ep_interrupts(dev, UDC_EPINT_IN_EP0 | UDC_EPINT_OUT_EP0);
pch_udc_set_dma(dev, DMA_DIR_TX);
pch_udc_set_dma(dev, DMA_DIR_RX);
pch_udc_ep_set_rrdy(&(dev->ep[UDC_EP0OUT_IDX]));
/* enable device interrupts */
pch_udc_enable_interrupts(dev, UDC_DEVINT_UR | UDC_DEVINT_US |
UDC_DEVINT_ES | UDC_DEVINT_ENUM |
UDC_DEVINT_SI | UDC_DEVINT_SC);
}
/**
* pch_udc_svc_intf_interrupt() - This function handles a set interface
* interrupt
* @dev: Reference to driver structure
*/
static void pch_udc_svc_intf_interrupt(struct pch_udc_dev *dev)
{
u32 reg, dev_stat = 0;
int i;
dev_stat = pch_udc_read_device_status(dev);
dev->cfg_data.cur_intf = (dev_stat & UDC_DEVSTS_INTF_MASK) >>
UDC_DEVSTS_INTF_SHIFT;
dev->cfg_data.cur_alt = (dev_stat & UDC_DEVSTS_ALT_MASK) >>
UDC_DEVSTS_ALT_SHIFT;
dev->set_cfg_not_acked = 1;
/* Construct the usb request for gadget driver and inform it */
memset(&dev->setup_data, 0 , sizeof dev->setup_data);
dev->setup_data.bRequest = USB_REQ_SET_INTERFACE;
dev->setup_data.bRequestType = USB_RECIP_INTERFACE;
dev->setup_data.wValue = cpu_to_le16(dev->cfg_data.cur_alt);
dev->setup_data.wIndex = cpu_to_le16(dev->cfg_data.cur_intf);
/* programm the Endpoint Cfg registers */
/* Only one end point cfg register */
reg = pch_udc_read_csr(dev, UDC_EP0OUT_IDX);
reg = (reg & ~UDC_CSR_NE_INTF_MASK) |
(dev->cfg_data.cur_intf << UDC_CSR_NE_INTF_SHIFT);
reg = (reg & ~UDC_CSR_NE_ALT_MASK) |
(dev->cfg_data.cur_alt << UDC_CSR_NE_ALT_SHIFT);
pch_udc_write_csr(dev, reg, UDC_EP0OUT_IDX);
for (i = 0; i < PCH_UDC_USED_EP_NUM * 2; i++) {
/* clear stall bits */
pch_udc_ep_clear_stall(&(dev->ep[i]));
dev->ep[i].halted = 0;
}
dev->stall = 0;
pch_udc_gadget_setup(dev);
}
/**
* pch_udc_svc_cfg_interrupt() - This function handles a set configuration
* interrupt
* @dev: Reference to driver structure
*/
static void pch_udc_svc_cfg_interrupt(struct pch_udc_dev *dev)
{
int i;
u32 reg, dev_stat = 0;
dev_stat = pch_udc_read_device_status(dev);
dev->set_cfg_not_acked = 1;
dev->cfg_data.cur_cfg = (dev_stat & UDC_DEVSTS_CFG_MASK) >>
UDC_DEVSTS_CFG_SHIFT;
/* make usb request for gadget driver */
memset(&dev->setup_data, 0 , sizeof dev->setup_data);
dev->setup_data.bRequest = USB_REQ_SET_CONFIGURATION;
dev->setup_data.wValue = cpu_to_le16(dev->cfg_data.cur_cfg);
/* program the NE registers */
/* Only one end point cfg register */
reg = pch_udc_read_csr(dev, UDC_EP0OUT_IDX);
reg = (reg & ~UDC_CSR_NE_CFG_MASK) |
(dev->cfg_data.cur_cfg << UDC_CSR_NE_CFG_SHIFT);
pch_udc_write_csr(dev, reg, UDC_EP0OUT_IDX);
for (i = 0; i < PCH_UDC_USED_EP_NUM * 2; i++) {
/* clear stall bits */
pch_udc_ep_clear_stall(&(dev->ep[i]));
dev->ep[i].halted = 0;
}
dev->stall = 0;
/* call gadget zero with setup data received */
pch_udc_gadget_setup(dev);
}
/**
* pch_udc_dev_isr() - This function services device interrupts
* by invoking appropriate routines.
* @dev: Reference to the device structure
* @dev_intr: The Device interrupt status.
*/
static void pch_udc_dev_isr(struct pch_udc_dev *dev, u32 dev_intr)
{
int vbus;
/* USB Reset Interrupt */
if (dev_intr & UDC_DEVINT_UR) {
pch_udc_svc_ur_interrupt(dev);
dev_dbg(&dev->pdev->dev, "USB_RESET\n");
}
/* Enumeration Done Interrupt */
if (dev_intr & UDC_DEVINT_ENUM) {
pch_udc_svc_enum_interrupt(dev);
dev_dbg(&dev->pdev->dev, "USB_ENUM\n");
}
/* Set Interface Interrupt */
if (dev_intr & UDC_DEVINT_SI)
pch_udc_svc_intf_interrupt(dev);
/* Set Config Interrupt */
if (dev_intr & UDC_DEVINT_SC)
pch_udc_svc_cfg_interrupt(dev);
/* USB Suspend interrupt */
if (dev_intr & UDC_DEVINT_US) {
if (dev->driver
&& dev->driver->suspend) {
spin_unlock(&dev->lock);
dev->driver->suspend(&dev->gadget);
spin_lock(&dev->lock);
}
vbus = pch_vbus_gpio_get_value(dev);
if ((dev->vbus_session == 0)
&& (vbus != 1)) {
if (dev->driver && dev->driver->disconnect) {
spin_unlock(&dev->lock);
dev->driver->disconnect(&dev->gadget);
spin_lock(&dev->lock);
}
pch_udc_reconnect(dev);
} else if ((dev->vbus_session == 0)
&& (vbus == 1)
&& !dev->vbus_gpio.intr)
schedule_work(&dev->vbus_gpio.irq_work_fall);
dev_dbg(&dev->pdev->dev, "USB_SUSPEND\n");
}
/* Clear the SOF interrupt, if enabled */
if (dev_intr & UDC_DEVINT_SOF)
dev_dbg(&dev->pdev->dev, "SOF\n");
/* ES interrupt, IDLE > 3ms on the USB */
if (dev_intr & UDC_DEVINT_ES)
dev_dbg(&dev->pdev->dev, "ES\n");
/* RWKP interrupt */
if (dev_intr & UDC_DEVINT_RWKP)
dev_dbg(&dev->pdev->dev, "RWKP\n");
}
/**
* pch_udc_isr() - This function handles interrupts from the PCH USB Device
* @irq: Interrupt request number
* @pdev: Reference to the device structure
*/
static irqreturn_t pch_udc_isr(int irq, void *pdev)
{
struct pch_udc_dev *dev = (struct pch_udc_dev *) pdev;
u32 dev_intr, ep_intr;
int i;
dev_intr = pch_udc_read_device_interrupts(dev);
ep_intr = pch_udc_read_ep_interrupts(dev);
/* For a hot plug, this find that the controller is hung up. */
if (dev_intr == ep_intr)
if (dev_intr == pch_udc_readl(dev, UDC_DEVCFG_ADDR)) {
dev_dbg(&dev->pdev->dev, "UDC: Hung up\n");
/* The controller is reset */
pch_udc_writel(dev, UDC_SRST, UDC_SRST_ADDR);
return IRQ_HANDLED;
}
if (dev_intr)
/* Clear device interrupts */
pch_udc_write_device_interrupts(dev, dev_intr);
if (ep_intr)
/* Clear ep interrupts */
pch_udc_write_ep_interrupts(dev, ep_intr);
if (!dev_intr && !ep_intr)
return IRQ_NONE;
spin_lock(&dev->lock);
if (dev_intr)
pch_udc_dev_isr(dev, dev_intr);
if (ep_intr) {
pch_udc_read_all_epstatus(dev, ep_intr);
/* Process Control In interrupts, if present */
if (ep_intr & UDC_EPINT_IN_EP0) {
pch_udc_svc_control_in(dev);
pch_udc_postsvc_epinters(dev, 0);
}
/* Process Control Out interrupts, if present */
if (ep_intr & UDC_EPINT_OUT_EP0)
pch_udc_svc_control_out(dev);
/* Process data in end point interrupts */
for (i = 1; i < PCH_UDC_USED_EP_NUM; i++) {
if (ep_intr & (1 << i)) {
pch_udc_svc_data_in(dev, i);
pch_udc_postsvc_epinters(dev, i);
}
}
/* Process data out end point interrupts */
for (i = UDC_EPINT_OUT_SHIFT + 1; i < (UDC_EPINT_OUT_SHIFT +
PCH_UDC_USED_EP_NUM); i++)
if (ep_intr & (1 << i))
pch_udc_svc_data_out(dev, i -
UDC_EPINT_OUT_SHIFT);
}
spin_unlock(&dev->lock);
return IRQ_HANDLED;
}
/**
* pch_udc_setup_ep0() - This function enables control endpoint for traffic
* @dev: Reference to the device structure
*/
static void pch_udc_setup_ep0(struct pch_udc_dev *dev)
{
/* enable ep0 interrupts */
pch_udc_enable_ep_interrupts(dev, UDC_EPINT_IN_EP0 |
UDC_EPINT_OUT_EP0);
/* enable device interrupts */
pch_udc_enable_interrupts(dev, UDC_DEVINT_UR | UDC_DEVINT_US |
UDC_DEVINT_ES | UDC_DEVINT_ENUM |
UDC_DEVINT_SI | UDC_DEVINT_SC);
}
/**
* pch_udc_pcd_reinit() - This API initializes the endpoint structures
* @dev: Reference to the driver structure
*/
static void pch_udc_pcd_reinit(struct pch_udc_dev *dev)
{
const char *const ep_string[] = {
ep0_string, "ep0out", "ep1in", "ep1out", "ep2in", "ep2out",
"ep3in", "ep3out", "ep4in", "ep4out", "ep5in", "ep5out",
"ep6in", "ep6out", "ep7in", "ep7out", "ep8in", "ep8out",
"ep9in", "ep9out", "ep10in", "ep10out", "ep11in", "ep11out",
"ep12in", "ep12out", "ep13in", "ep13out", "ep14in", "ep14out",
"ep15in", "ep15out",
};
int i;
dev->gadget.speed = USB_SPEED_UNKNOWN;
INIT_LIST_HEAD(&dev->gadget.ep_list);
/* Initialize the endpoints structures */
memset(dev->ep, 0, sizeof dev->ep);
for (i = 0; i < PCH_UDC_EP_NUM; i++) {
struct pch_udc_ep *ep = &dev->ep[i];
ep->dev = dev;
ep->halted = 1;
ep->num = i / 2;
ep->in = ~i & 1;
ep->ep.name = ep_string[i];
ep->ep.ops = &pch_udc_ep_ops;
if (ep->in) {
ep->offset_addr = ep->num * UDC_EP_REG_SHIFT;
ep->ep.caps.dir_in = true;
} else {
ep->offset_addr = (UDC_EPINT_OUT_SHIFT + ep->num) *
UDC_EP_REG_SHIFT;
ep->ep.caps.dir_out = true;
}
if (i == UDC_EP0IN_IDX || i == UDC_EP0OUT_IDX) {
ep->ep.caps.type_control = true;
} else {
ep->ep.caps.type_iso = true;
ep->ep.caps.type_bulk = true;
ep->ep.caps.type_int = true;
}
/* need to set ep->ep.maxpacket and set Default Configuration?*/
usb_ep_set_maxpacket_limit(&ep->ep, UDC_BULK_MAX_PKT_SIZE);
list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
INIT_LIST_HEAD(&ep->queue);
}
usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0IN_IDX].ep, UDC_EP0IN_MAX_PKT_SIZE);
usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0OUT_IDX].ep, UDC_EP0OUT_MAX_PKT_SIZE);
/* remove ep0 in and out from the list. They have own pointer */
list_del_init(&dev->ep[UDC_EP0IN_IDX].ep.ep_list);
list_del_init(&dev->ep[UDC_EP0OUT_IDX].ep.ep_list);
dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IDX].ep;
INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
}
/**
* pch_udc_pcd_init() - This API initializes the driver structure
* @dev: Reference to the driver structure
*
* Return codes:
* 0: Success
* -ERRNO: All kind of errors when retrieving VBUS GPIO
*/
static int pch_udc_pcd_init(struct pch_udc_dev *dev)
{
int ret;
pch_udc_init(dev);
pch_udc_pcd_reinit(dev);
ret = pch_vbus_gpio_init(dev);
if (ret)
pch_udc_exit(dev);
return ret;
}
/**
* init_dma_pools() - create dma pools during initialization
* @dev: reference to struct pci_dev
*/
static int init_dma_pools(struct pch_udc_dev *dev)
{
struct pch_udc_stp_dma_desc *td_stp;
struct pch_udc_data_dma_desc *td_data;
void *ep0out_buf;
/* DMA setup */
dev->data_requests = dma_pool_create("data_requests", &dev->pdev->dev,
sizeof(struct pch_udc_data_dma_desc), 0, 0);
if (!dev->data_requests) {
dev_err(&dev->pdev->dev, "%s: can't get request data pool\n",
__func__);
return -ENOMEM;
}
/* dma desc for setup data */
dev->stp_requests = dma_pool_create("setup requests", &dev->pdev->dev,
sizeof(struct pch_udc_stp_dma_desc), 0, 0);
if (!dev->stp_requests) {
dev_err(&dev->pdev->dev, "%s: can't get setup request pool\n",
__func__);
return -ENOMEM;
}
/* setup */
td_stp = dma_pool_alloc(dev->stp_requests, GFP_KERNEL,
&dev->ep[UDC_EP0OUT_IDX].td_stp_phys);
if (!td_stp) {
dev_err(&dev->pdev->dev,
"%s: can't allocate setup dma descriptor\n", __func__);
return -ENOMEM;
}
dev->ep[UDC_EP0OUT_IDX].td_stp = td_stp;
/* data: 0 packets !? */
td_data = dma_pool_alloc(dev->data_requests, GFP_KERNEL,
&dev->ep[UDC_EP0OUT_IDX].td_data_phys);
if (!td_data) {
dev_err(&dev->pdev->dev,
"%s: can't allocate data dma descriptor\n", __func__);
return -ENOMEM;
}
dev->ep[UDC_EP0OUT_IDX].td_data = td_data;
dev->ep[UDC_EP0IN_IDX].td_stp = NULL;
dev->ep[UDC_EP0IN_IDX].td_stp_phys = 0;
dev->ep[UDC_EP0IN_IDX].td_data = NULL;
dev->ep[UDC_EP0IN_IDX].td_data_phys = 0;
ep0out_buf = devm_kzalloc(&dev->pdev->dev, UDC_EP0OUT_BUFF_SIZE * 4,
GFP_KERNEL);
if (!ep0out_buf)
return -ENOMEM;
dev->dma_addr = dma_map_single(&dev->pdev->dev, ep0out_buf,
UDC_EP0OUT_BUFF_SIZE * 4,
DMA_FROM_DEVICE);
return dma_mapping_error(&dev->pdev->dev, dev->dma_addr);
}
static int pch_udc_start(struct usb_gadget *g,
struct usb_gadget_driver *driver)
{
struct pch_udc_dev *dev = to_pch_udc(g);
dev->driver = driver;
/* get ready for ep0 traffic */
pch_udc_setup_ep0(dev);
/* clear SD */
if ((pch_vbus_gpio_get_value(dev) != 0) || !dev->vbus_gpio.intr)
pch_udc_clear_disconnect(dev);
dev->connected = 1;
return 0;
}
static int pch_udc_stop(struct usb_gadget *g)
{
struct pch_udc_dev *dev = to_pch_udc(g);
pch_udc_disable_interrupts(dev, UDC_DEVINT_MSK);
/* Assures that there are no pending requests with this driver */
dev->driver = NULL;
dev->connected = 0;
/* set SD */
pch_udc_set_disconnect(dev);
return 0;
}
static void pch_vbus_gpio_remove_table(void *table)
{
gpiod_remove_lookup_table(table);
}
static int pch_vbus_gpio_add_table(struct device *d, void *table)
{
gpiod_add_lookup_table(table);
return devm_add_action_or_reset(d, pch_vbus_gpio_remove_table, table);
}
static struct gpiod_lookup_table pch_udc_minnow_vbus_gpio_table = {
.dev_id = "0000:02:02.4",
.table = {
GPIO_LOOKUP("sch_gpio.33158", 12, NULL, GPIO_ACTIVE_HIGH),
{}
},
};
static int pch_udc_minnow_platform_init(struct device *d)
{
return pch_vbus_gpio_add_table(d, &pch_udc_minnow_vbus_gpio_table);
}
static int pch_udc_quark_platform_init(struct device *d)
{
struct pch_udc_dev *dev = dev_get_drvdata(d);
dev->bar = PCH_UDC_PCI_BAR_QUARK_X1000;
return 0;
}
static void pch_udc_shutdown(struct pci_dev *pdev)
{
struct pch_udc_dev *dev = pci_get_drvdata(pdev);
pch_udc_disable_interrupts(dev, UDC_DEVINT_MSK);
pch_udc_disable_ep_interrupts(dev, UDC_EPINT_MSK_DISABLE_ALL);
/* disable the pullup so the host will think we're gone */
pch_udc_set_disconnect(dev);
}
static void pch_udc_remove(struct pci_dev *pdev)
{
struct pch_udc_dev *dev = pci_get_drvdata(pdev);
usb_del_gadget_udc(&dev->gadget);
/* gadget driver must not be registered */
if (dev->driver)
dev_err(&pdev->dev,
"%s: gadget driver still bound!!!\n", __func__);
/* dma pool cleanup */
dma_pool_destroy(dev->data_requests);
if (dev->stp_requests) {
/* cleanup DMA desc's for ep0in */
if (dev->ep[UDC_EP0OUT_IDX].td_stp) {
dma_pool_free(dev->stp_requests,
dev->ep[UDC_EP0OUT_IDX].td_stp,
dev->ep[UDC_EP0OUT_IDX].td_stp_phys);
}
if (dev->ep[UDC_EP0OUT_IDX].td_data) {
dma_pool_free(dev->stp_requests,
dev->ep[UDC_EP0OUT_IDX].td_data,
dev->ep[UDC_EP0OUT_IDX].td_data_phys);
}
dma_pool_destroy(dev->stp_requests);
}
if (dev->dma_addr)
dma_unmap_single(&dev->pdev->dev, dev->dma_addr,
UDC_EP0OUT_BUFF_SIZE * 4, DMA_FROM_DEVICE);
pch_vbus_gpio_free(dev);
pch_udc_exit(dev);
}
static int __maybe_unused pch_udc_suspend(struct device *d)
{
struct pch_udc_dev *dev = dev_get_drvdata(d);
pch_udc_disable_interrupts(dev, UDC_DEVINT_MSK);
pch_udc_disable_ep_interrupts(dev, UDC_EPINT_MSK_DISABLE_ALL);
return 0;
}
static int __maybe_unused pch_udc_resume(struct device *d)
{
return 0;
}
static SIMPLE_DEV_PM_OPS(pch_udc_pm, pch_udc_suspend, pch_udc_resume);
typedef int (*platform_init_fn)(struct device *);
static int pch_udc_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
platform_init_fn platform_init = (platform_init_fn)id->driver_data;
int retval;
struct pch_udc_dev *dev;
/* init */
dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
/* pci setup */
retval = pcim_enable_device(pdev);
if (retval)
return retval;
dev->bar = PCH_UDC_PCI_BAR;
dev->pdev = pdev;
pci_set_drvdata(pdev, dev);
/* Platform specific hook */
if (platform_init) {
retval = platform_init(&pdev->dev);
if (retval)
return retval;
}
/* PCI resource allocation */
retval = pcim_iomap_regions(pdev, BIT(dev->bar), pci_name(pdev));
if (retval)
return retval;
dev->base_addr = pcim_iomap_table(pdev)[dev->bar];
/* initialize the hardware */
retval = pch_udc_pcd_init(dev);
if (retval)
return retval;
pci_enable_msi(pdev);
retval = devm_request_irq(&pdev->dev, pdev->irq, pch_udc_isr,
IRQF_SHARED, KBUILD_MODNAME, dev);
if (retval) {
dev_err(&pdev->dev, "%s: request_irq(%d) fail\n", __func__,
pdev->irq);
goto finished;
}
pci_set_master(pdev);
pci_try_set_mwi(pdev);
/* device struct setup */
spin_lock_init(&dev->lock);
dev->gadget.ops = &pch_udc_ops;
retval = init_dma_pools(dev);
if (retval)
goto finished;
dev->gadget.name = KBUILD_MODNAME;
dev->gadget.max_speed = USB_SPEED_HIGH;
/* Put the device in disconnected state till a driver is bound */
pch_udc_set_disconnect(dev);
retval = usb_add_gadget_udc(&pdev->dev, &dev->gadget);
if (retval)
goto finished;
return 0;
finished:
pch_udc_remove(pdev);
return retval;
}
static const struct pci_device_id pch_udc_pcidev_id[] = {
{
PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_QUARK_X1000_UDC),
.class = PCI_CLASS_SERIAL_USB_DEVICE,
.class_mask = 0xffffffff,
.driver_data = (kernel_ulong_t)&pch_udc_quark_platform_init,
},
{
PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EG20T_UDC,
PCI_VENDOR_ID_CIRCUITCO, PCI_SUBSYSTEM_ID_CIRCUITCO_MINNOWBOARD),
.class = PCI_CLASS_SERIAL_USB_DEVICE,
.class_mask = 0xffffffff,
.driver_data = (kernel_ulong_t)&pch_udc_minnow_platform_init,
},
{
PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EG20T_UDC),
.class = PCI_CLASS_SERIAL_USB_DEVICE,
.class_mask = 0xffffffff,
},
{
PCI_DEVICE(PCI_VENDOR_ID_ROHM, PCI_DEVICE_ID_ML7213_IOH_UDC),
.class = PCI_CLASS_SERIAL_USB_DEVICE,
.class_mask = 0xffffffff,
},
{
PCI_DEVICE(PCI_VENDOR_ID_ROHM, PCI_DEVICE_ID_ML7831_IOH_UDC),
.class = PCI_CLASS_SERIAL_USB_DEVICE,
.class_mask = 0xffffffff,
},
{ 0 },
};
MODULE_DEVICE_TABLE(pci, pch_udc_pcidev_id);
static struct pci_driver pch_udc_driver = {
.name = KBUILD_MODNAME,
.id_table = pch_udc_pcidev_id,
.probe = pch_udc_probe,
.remove = pch_udc_remove,
.shutdown = pch_udc_shutdown,
.driver = {
.pm = &pch_udc_pm,
},
};
module_pci_driver(pch_udc_driver);
MODULE_DESCRIPTION("Intel EG20T USB Device Controller");
MODULE_AUTHOR("LAPIS Semiconductor, <[email protected]>");
MODULE_LICENSE("GPL");
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