/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
/*
* Siemens System Memory Buffer driver.
* Copyright(c) 2022, HiSilicon Limited.
*/
#ifndef _ULTRASOC_SMB_H
#define _ULTRASOC_SMB_H
#include <linux/miscdevice.h>
#include <linux/spinlock.h>
/* Offset of SMB global registers */
#define SMB_GLB_CFG_REG 0x00
#define SMB_GLB_EN_REG 0x04
#define SMB_GLB_INT_REG 0x08
/* Offset of SMB logical buffer registers */
#define SMB_LB_CFG_LO_REG 0x40
#define SMB_LB_CFG_HI_REG 0x44
#define SMB_LB_INT_CTRL_REG 0x48
#define SMB_LB_INT_STS_REG 0x4c
#define SMB_LB_RD_ADDR_REG 0x5c
#define SMB_LB_WR_ADDR_REG 0x60
#define SMB_LB_PURGE_REG 0x64
/* Set global config register */
#define SMB_GLB_CFG_BURST_LEN_MSK GENMASK(11, 4)
#define SMB_GLB_CFG_IDLE_PRD_MSK GENMASK(15, 12)
#define SMB_GLB_CFG_MEM_WR_MSK GENMASK(21, 16)
#define SMB_GLB_CFG_MEM_RD_MSK GENMASK(27, 22)
#define SMB_GLB_CFG_DEFAULT (FIELD_PREP(SMB_GLB_CFG_BURST_LEN_MSK, 0xf) | \
FIELD_PREP(SMB_GLB_CFG_IDLE_PRD_MSK, 0xf) | \
FIELD_PREP(SMB_GLB_CFG_MEM_WR_MSK, 0x3) | \
FIELD_PREP(SMB_GLB_CFG_MEM_RD_MSK, 0x1b))
#define SMB_GLB_EN_HW_ENABLE BIT(0)
/* Set global interrupt control register */
#define SMB_GLB_INT_EN BIT(0)
#define SMB_GLB_INT_PULSE BIT(1) /* Interrupt type: 1 - Pulse */
#define SMB_GLB_INT_ACT_H BIT(2) /* Interrupt polarity: 1 - Active high */
#define SMB_GLB_INT_CFG (SMB_GLB_INT_EN | SMB_GLB_INT_PULSE | \
SMB_GLB_INT_ACT_H)
/* Set logical buffer config register lower 32 bits */
#define SMB_LB_CFG_LO_EN BIT(0)
#define SMB_LB_CFG_LO_SINGLE_END BIT(1)
#define SMB_LB_CFG_LO_INIT BIT(8)
#define SMB_LB_CFG_LO_CONT BIT(11)
#define SMB_LB_CFG_LO_FLOW_MSK GENMASK(19, 16)
#define SMB_LB_CFG_LO_DEFAULT (SMB_LB_CFG_LO_EN | SMB_LB_CFG_LO_SINGLE_END | \
SMB_LB_CFG_LO_INIT | SMB_LB_CFG_LO_CONT | \
FIELD_PREP(SMB_LB_CFG_LO_FLOW_MSK, 0xf))
/* Set logical buffer config register upper 32 bits */
#define SMB_LB_CFG_HI_RANGE_UP_MSK GENMASK(15, 8)
#define SMB_LB_CFG_HI_DEFAULT FIELD_PREP(SMB_LB_CFG_HI_RANGE_UP_MSK, 0xff)
/*
* Set logical buffer interrupt control register.
* The register control the validity of both real-time events and
* interrupts. When logical buffer status changes causes to issue
* an interrupt at the same time as it issues a real-time event.
* Real-time events are used in SMB driver, which needs to get the buffer
* status. Interrupts are used in debugger mode.
* SMB_LB_INT_CTRL_BUF_NOTE_MASK control which events flags or interrupts
* are valid.
*/
#define SMB_LB_INT_CTRL_EN BIT(0)
#define SMB_LB_INT_CTRL_BUF_NOTE_MSK GENMASK(11, 8)
#define SMB_LB_INT_CTRL_CFG (SMB_LB_INT_CTRL_EN | \
FIELD_PREP(SMB_LB_INT_CTRL_BUF_NOTE_MSK, 0xf))
/* Set logical buffer interrupt status register */
#define SMB_LB_INT_STS_NOT_EMPTY_MSK BIT(0)
#define SMB_LB_INT_STS_BUF_RESET_MSK GENMASK(3, 0)
#define SMB_LB_INT_STS_RESET FIELD_PREP(SMB_LB_INT_STS_BUF_RESET_MSK, 0xf)
#define SMB_LB_PURGE_PURGED BIT(0)
#define SMB_REG_ADDR_RES 0
#define SMB_BUF_ADDR_RES 1
#define SMB_BUF_ADDR_LO_MSK GENMASK(31, 0)
/**
* struct smb_data_buffer - Details of the buffer used by SMB
* @buf_base: Memory mapped base address of SMB.
* @buf_hw_base: SMB buffer start Physical base address, only used 32bits.
* @buf_size: Size of the buffer.
* @data_size: Size of the available trace data for SMB.
* @buf_rdptr: Current read position (index) within the buffer.
*/
struct smb_data_buffer {
void *buf_base;
u32 buf_hw_base;
unsigned long buf_size;
unsigned long data_size;
unsigned long buf_rdptr;
};
/**
* struct smb_drv_data - specifics associated to an SMB component
* @base: Memory mapped base address for SMB component.
* @csdev: Component vitals needed by the framework.
* @sdb: Data buffer for SMB.
* @miscdev: Specifics to handle "/dev/xyz.smb" entry.
* @spinlock: Control data access to one at a time.
* @reading: Synchronise user space access to SMB buffer.
* @pid: Process ID of the process being monitored by the
* session that is using this component.
*/
struct smb_drv_data {
void __iomem *base;
struct coresight_device *csdev;
struct smb_data_buffer sdb;
struct miscdevice miscdev;
spinlock_t spinlock;
bool reading;
pid_t pid;
};
#endif
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