// SPDX-License-Identifier: GPL-2.0-only /* * SPI bus driver for the Topcliff PCH used by Intel SoCs * * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd. */ #include <linux/delay.h> #include <linux/pci.h> #include <linux/wait.h> #include <linux/spi/spi.h> #include <linux/interrupt.h> #include <linux/sched.h> #include <linux/spi/spidev.h> #include <linux/module.h> #include <linux/device.h> #include <linux/platform_device.h> #include <linux/dmaengine.h> #include <linux/pch_dma.h> /* Register offsets */ #define PCH_SPCR … #define PCH_SPBRR … #define PCH_SPSR … #define PCH_SPDWR … #define PCH_SPDRR … #define PCH_SSNXCR … #define PCH_SRST … #define PCH_ADDRESS_SIZE … #define PCH_SPSR_TFD … #define PCH_SPSR_RFD … #define PCH_READABLE(x) … #define PCH_WRITABLE(x) … #define PCH_RX_THOLD … #define PCH_RX_THOLD_MAX … #define PCH_TX_THOLD … #define PCH_MAX_BAUDRATE … #define PCH_MAX_FIFO_DEPTH … #define STATUS_RUNNING … #define STATUS_EXITING … #define PCH_SLEEP_TIME … #define SSN_LOW … #define SSN_HIGH … #define SSN_NO_CONTROL … #define PCH_MAX_CS … #define PCI_DEVICE_ID_GE_SPI … #define SPCR_SPE_BIT … #define SPCR_MSTR_BIT … #define SPCR_LSBF_BIT … #define SPCR_CPHA_BIT … #define SPCR_CPOL_BIT … #define SPCR_TFIE_BIT … #define SPCR_RFIE_BIT … #define SPCR_FIE_BIT … #define SPCR_ORIE_BIT … #define SPCR_MDFIE_BIT … #define SPCR_FICLR_BIT … #define SPSR_TFI_BIT … #define SPSR_RFI_BIT … #define SPSR_FI_BIT … #define SPSR_ORF_BIT … #define SPBRR_SIZE_BIT … #define PCH_ALL … #define SPCR_RFIC_FIELD … #define SPCR_TFIC_FIELD … #define MASK_SPBRR_SPBR_BITS … #define MASK_RFIC_SPCR_BITS … #define MASK_TFIC_SPCR_BITS … #define PCH_CLOCK_HZ … #define PCH_MAX_SPBR … /* Definition for ML7213/ML7223/ML7831 by LAPIS Semiconductor */ #define PCI_DEVICE_ID_ML7213_SPI … #define PCI_DEVICE_ID_ML7223_SPI … #define PCI_DEVICE_ID_ML7831_SPI … /* * Set the number of SPI instance max * Intel EG20T PCH : 1ch * LAPIS Semiconductor ML7213 IOH : 2ch * LAPIS Semiconductor ML7223 IOH : 1ch * LAPIS Semiconductor ML7831 IOH : 1ch */ #define PCH_SPI_MAX_DEV … #define PCH_BUF_SIZE … #define PCH_DMA_TRANS_SIZE … static int use_dma = …; struct pch_spi_dma_ctrl { … }; /** * struct pch_spi_data - Holds the SPI channel specific details * @io_remap_addr: The remapped PCI base address * @io_base_addr: Base address * @host: Pointer to the SPI controller structure * @work: Reference to work queue handler * @wait: Wait queue for waking up upon receiving an * interrupt. * @transfer_complete: Status of SPI Transfer * @bcurrent_msg_processing: Status flag for message processing * @lock: Lock for protecting this structure * @queue: SPI Message queue * @status: Status of the SPI driver * @bpw_len: Length of data to be transferred in bits per * word * @transfer_active: Flag showing active transfer * @tx_index: Transmit data count; for bookkeeping during * transfer * @rx_index: Receive data count; for bookkeeping during * transfer * @pkt_tx_buff: Buffer for data to be transmitted * @pkt_rx_buff: Buffer for received data * @n_curnt_chip: The chip number that this SPI driver currently * operates on * @current_chip: Reference to the current chip that this SPI * driver currently operates on * @current_msg: The current message that this SPI driver is * handling * @cur_trans: The current transfer that this SPI driver is * handling * @board_dat: Reference to the SPI device data structure * @plat_dev: platform_device structure * @ch: SPI channel number * @dma: Local DMA information * @use_dma: True if DMA is to be used * @irq_reg_sts: Status of IRQ registration * @save_total_len: Save length while data is being transferred */ struct pch_spi_data { … }; /** * struct pch_spi_board_data - Holds the SPI device specific details * @pdev: Pointer to the PCI device * @suspend_sts: Status of suspend * @num: The number of SPI device instance */ struct pch_spi_board_data { … }; struct pch_pd_dev_save { … }; static const struct pci_device_id pch_spi_pcidev_id[] = …; /** * pch_spi_writereg() - Performs register writes * @host: Pointer to struct spi_controller. * @idx: Register offset. * @val: Value to be written to register. */ static inline void pch_spi_writereg(struct spi_controller *host, int idx, u32 val) { … } /** * pch_spi_readreg() - Performs register reads * @host: Pointer to struct spi_controller. * @idx: Register offset. */ static inline u32 pch_spi_readreg(struct spi_controller *host, int idx) { … } static inline void pch_spi_setclr_reg(struct spi_controller *host, int idx, u32 set, u32 clr) { … } static void pch_spi_set_host_mode(struct spi_controller *host) { … } /** * pch_spi_clear_fifo() - Clears the Transmit and Receive FIFOs * @host: Pointer to struct spi_controller. */ static void pch_spi_clear_fifo(struct spi_controller *host) { … } static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val, void __iomem *io_remap_addr) { … } /** * pch_spi_handler() - Interrupt handler * @irq: The interrupt number. * @dev_id: Pointer to struct pch_spi_board_data. */ static irqreturn_t pch_spi_handler(int irq, void *dev_id) { … } /** * pch_spi_set_baud_rate() - Sets SPBR field in SPBRR * @host: Pointer to struct spi_controller. * @speed_hz: Baud rate. */ static void pch_spi_set_baud_rate(struct spi_controller *host, u32 speed_hz) { … } /** * pch_spi_set_bits_per_word() - Sets SIZE field in SPBRR * @host: Pointer to struct spi_controller. * @bits_per_word: Bits per word for SPI transfer. */ static void pch_spi_set_bits_per_word(struct spi_controller *host, u8 bits_per_word) { … } /** * pch_spi_setup_transfer() - Configures the PCH SPI hardware for transfer * @spi: Pointer to struct spi_device. */ static void pch_spi_setup_transfer(struct spi_device *spi) { … } /** * pch_spi_reset() - Clears SPI registers * @host: Pointer to struct spi_controller. */ static void pch_spi_reset(struct spi_controller *host) { … } static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg) { … } static inline void pch_spi_select_chip(struct pch_spi_data *data, struct spi_device *pspi) { … } static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw) { … } static void pch_spi_nomore_transfer(struct pch_spi_data *data) { … } static void pch_spi_set_ir(struct pch_spi_data *data) { … } static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw) { … } static void pch_spi_copy_rx_data_for_dma(struct pch_spi_data *data, int bpw) { … } static int pch_spi_start_transfer(struct pch_spi_data *data) { … } static void pch_dma_rx_complete(void *arg) { … } static bool pch_spi_filter(struct dma_chan *chan, void *slave) { … } static void pch_spi_request_dma(struct pch_spi_data *data, int bpw) { … } static void pch_spi_release_dma(struct pch_spi_data *data) { … } static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) { … } static void pch_spi_process_messages(struct work_struct *pwork) { … } static void pch_spi_free_resources(struct pch_spi_board_data *board_dat, struct pch_spi_data *data) { … } static int pch_spi_get_resources(struct pch_spi_board_data *board_dat, struct pch_spi_data *data) { … } static void pch_free_dma_buf(struct pch_spi_board_data *board_dat, struct pch_spi_data *data) { … } static int pch_alloc_dma_buf(struct pch_spi_board_data *board_dat, struct pch_spi_data *data) { … } static int pch_spi_pd_probe(struct platform_device *plat_dev) { … } static void pch_spi_pd_remove(struct platform_device *plat_dev) { … } #ifdef CONFIG_PM static int pch_spi_pd_suspend(struct platform_device *pd_dev, pm_message_t state) { … } static int pch_spi_pd_resume(struct platform_device *pd_dev) { … } #else #define pch_spi_pd_suspend … #define pch_spi_pd_resume … #endif static struct platform_driver pch_spi_pd_driver = …; static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id) { … } static void pch_spi_remove(struct pci_dev *pdev) { … } static int __maybe_unused pch_spi_suspend(struct device *dev) { … } static int __maybe_unused pch_spi_resume(struct device *dev) { … } static SIMPLE_DEV_PM_OPS(pch_spi_pm_ops, pch_spi_suspend, pch_spi_resume); static struct pci_driver pch_spi_pcidev_driver = …; static int __init pch_spi_init(void) { … } module_init(…) …; static void __exit pch_spi_exit(void) { … } module_exit(pch_spi_exit); module_param(use_dma, int, 0644); MODULE_PARM_DESC(…) …; MODULE_LICENSE(…) …; MODULE_DESCRIPTION(…) …; MODULE_DEVICE_TABLE(pci, pch_spi_pcidev_id);
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