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Commit 8174178a authored by qctecmdr's avatar qctecmdr Committed by Gerrit - the friendly Code Review server
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Merge "SPI: spi_qsd: Add snapshot of SPI QSD driver"

parents 13fa8633 717e1e28

drivers/spi/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -108,7 +108,7 @@ obj-$(CONFIG_SPI_XILINX) += spi-xilinx.o 
obj-$(CONFIG_SPI_XLP)			+= spi-xlp.o

obj-$(CONFIG_SPI_XTENSA_XTFPGA)		+= spi-xtensa-xtfpga.o

obj-$(CONFIG_SPI_ZYNQMP_GQSPI)		+= spi-zynqmp-gqspi.o



obj-$(CONFIG_SPI_QUP)			+= spi_qsd.o

# SPI slave protocol handlers

obj-$(CONFIG_SPI_SLAVE_TIME)		+= spi-slave-time.o

obj-$(CONFIG_SPI_SLAVE_SYSTEM_CONTROL)	+= spi-slave-system-control.o

drivers/spi/spi_qsd.c

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+2768 −0

File added.

Preview size limit exceeded, changes collapsed.

drivers/spi/spi_qsd.h

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/* SPDX-License-Identifier: GPL-2.0-only */

/* Copyright (c) 2014-2018, 2020, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */



#ifndef _SPI_QSD_H

#define _SPI_QSD_H



#include <linux/pinctrl/consumer.h>

#define SPI_DRV_NAME                  "spi_qsd"



#if IS_ENABLED(CONFIG_SPI_QSD) || IS_ENABLED(CONFIG_SPI_QSD_MODULE)



#define QSD_REG(x) (x)

#define QUP_REG(x)



#define SPI_FIFO_WORD_CNT             0x0048



#else



#define QSD_REG(x)

#define QUP_REG(x) (x)



#define QUP_CONFIG                    0x0000 /* N & NO_INPUT/NO_OUTPUT bits */

#define QUP_ERROR_FLAGS_EN            0x030C

#define QUP_ERR_MASK                  0x3

#define SPI_OUTPUT_FIFO_WORD_CNT      0x010C

#define SPI_INPUT_FIFO_WORD_CNT       0x0214

#define QUP_MX_WRITE_COUNT            0x0150

#define QUP_MX_WRITE_CNT_CURRENT      0x0154



#define QUP_CONFIG_SPI_MODE           0x0100

#endif



#define GSBI_CTRL_REG                 0x0

#define GSBI_SPI_CONFIG               0x30

/* B-family only registers */

#define QUP_HARDWARE_VER              0x0030

#define QUP_HARDWARE_VER_2_1_1        0X20010001

#define QUP_OPERATIONAL_MASK          0x0028

#define QUP_OP_MASK_OUTPUT_SERVICE_FLAG 0x100

#define QUP_OP_MASK_INPUT_SERVICE_FLAG  0x200



#define QUP_ERROR_FLAGS               0x0308



#define SPI_CONFIG                    (QSD_REG(0x0000) QUP_REG(0x0300))

#define SPI_IO_CONTROL                (QSD_REG(0x0004) QUP_REG(0x0304))

#define SPI_IO_MODES                  (QSD_REG(0x0008) QUP_REG(0x0008))

#define SPI_SW_RESET                  (QSD_REG(0x000C) QUP_REG(0x000C))

#define SPI_TIME_OUT_CURRENT          (QSD_REG(0x0014) QUP_REG(0x0014))

#define SPI_MX_OUTPUT_COUNT           (QSD_REG(0x0018) QUP_REG(0x0100))

#define SPI_MX_OUTPUT_CNT_CURRENT     (QSD_REG(0x001C) QUP_REG(0x0104))

#define SPI_MX_INPUT_COUNT            (QSD_REG(0x0020) QUP_REG(0x0200))

#define SPI_MX_INPUT_CNT_CURRENT      (QSD_REG(0x0024) QUP_REG(0x0204))

#define SPI_MX_READ_COUNT             (QSD_REG(0x0028) QUP_REG(0x0208))

#define SPI_MX_READ_CNT_CURRENT       (QSD_REG(0x002C) QUP_REG(0x020C))

#define SPI_OPERATIONAL               (QSD_REG(0x0030) QUP_REG(0x0018))

#define SPI_ERROR_FLAGS               (QSD_REG(0x0034) QUP_REG(0x001C))

#define SPI_ERROR_FLAGS_EN            (QSD_REG(0x0038) QUP_REG(0x0020))

#define SPI_DEASSERT_WAIT             (QSD_REG(0x003C) QUP_REG(0x0310))

#define SPI_OUTPUT_DEBUG              (QSD_REG(0x0040) QUP_REG(0x0108))

#define SPI_INPUT_DEBUG               (QSD_REG(0x0044) QUP_REG(0x0210))

#define SPI_TEST_CTRL                 (QSD_REG(0x004C) QUP_REG(0x0024))

#define SPI_OUTPUT_FIFO               (QSD_REG(0x0100) QUP_REG(0x0110))

#define SPI_INPUT_FIFO                (QSD_REG(0x0200) QUP_REG(0x0218))

#define SPI_STATE                     (QSD_REG(SPI_OPERATIONAL) QUP_REG(0x0004))



/* QUP_CONFIG fields */

#define SPI_CFG_N                     0x0000001F

#define SPI_NO_INPUT                  0x00000080

#define SPI_NO_OUTPUT                 0x00000040

#define SPI_EN_EXT_OUT_FLAG           0x00010000



/* SPI_CONFIG fields */

#define SPI_CFG_LOOPBACK              0x00000100

#define SPI_CFG_INPUT_FIRST           0x00000200

#define SPI_CFG_HS_MODE               0x00000400



/* SPI_IO_CONTROL fields */

#define SPI_IO_C_FORCE_CS             0x00000800

#define SPI_IO_C_CLK_IDLE_HIGH        0x00000400

#define SPI_IO_C_MX_CS_MODE           0x00000100

#define SPI_IO_C_CS_N_POLARITY        0x000000F0

#define SPI_IO_C_CS_N_POLARITY_0      0x00000010

#define SPI_IO_C_CS_SELECT            0x0000000C

#define SPI_IO_C_TRISTATE_CS          0x00000002

#define SPI_IO_C_NO_TRI_STATE         0x00000001



/* SPI_IO_MODES fields */

#define SPI_IO_M_OUTPUT_BIT_SHIFT_EN  (QSD_REG(0x00004000) QUP_REG(0x00010000))

#define SPI_IO_M_PACK_EN              (QSD_REG(0x00002000) QUP_REG(0x00008000))

#define SPI_IO_M_UNPACK_EN            (QSD_REG(0x00001000) QUP_REG(0x00004000))

#define SPI_IO_M_INPUT_MODE           (QSD_REG(0x00000C00) QUP_REG(0x00003000))

#define SPI_IO_M_OUTPUT_MODE          (QSD_REG(0x00000300) QUP_REG(0x00000C00))

#define SPI_IO_M_INPUT_FIFO_SIZE      (QSD_REG(0x000000C0) QUP_REG(0x00000380))

#define SPI_IO_M_INPUT_BLOCK_SIZE     (QSD_REG(0x00000030) QUP_REG(0x00000060))

#define SPI_IO_M_OUTPUT_FIFO_SIZE     (QSD_REG(0x0000000C) QUP_REG(0x0000001C))

#define SPI_IO_M_OUTPUT_BLOCK_SIZE    (QSD_REG(0x00000003) QUP_REG(0x00000003))



#define INPUT_BLOCK_SZ_SHIFT          (QSD_REG(4)          QUP_REG(5))

#define INPUT_FIFO_SZ_SHIFT           (QSD_REG(6)          QUP_REG(7))

#define OUTPUT_BLOCK_SZ_SHIFT         (QSD_REG(0)          QUP_REG(0))

#define OUTPUT_FIFO_SZ_SHIFT          (QSD_REG(2)          QUP_REG(2))

#define OUTPUT_MODE_SHIFT             (QSD_REG(8)          QUP_REG(10))

#define INPUT_MODE_SHIFT              (QSD_REG(10)         QUP_REG(12))



/* SPI_OPERATIONAL fields */

#define SPI_OP_IN_BLK_RD_REQ_FLAG     0x00002000

#define SPI_OP_OUT_BLK_WR_REQ_FLAG    0x00001000

#define SPI_OP_MAX_INPUT_DONE_FLAG    0x00000800

#define SPI_OP_MAX_OUTPUT_DONE_FLAG   0x00000400

#define SPI_OP_INPUT_SERVICE_FLAG     0x00000200

#define SPI_OP_OUTPUT_SERVICE_FLAG    0x00000100

#define SPI_OP_INPUT_FIFO_FULL        0x00000080

#define SPI_OP_OUTPUT_FIFO_FULL       0x00000040

#define SPI_OP_IP_FIFO_NOT_EMPTY      0x00000020

#define SPI_OP_OP_FIFO_NOT_EMPTY      0x00000010

#define SPI_OP_STATE_VALID            0x00000004

#define SPI_OP_STATE                  0x00000003



#define SPI_OP_STATE_CLEAR_BITS       0x2



#define SPI_PINCTRL_STATE_DEFAULT "spi_default"

#define SPI_PINCTRL_STATE_SLEEP "spi_sleep"



enum msm_spi_state {

	SPI_OP_STATE_RESET = 0x00000000,

	SPI_OP_STATE_RUN   = 0x00000001,

	SPI_OP_STATE_PAUSE = 0x00000003,

};



/* SPI_ERROR_FLAGS fields */

#define SPI_ERR_OUTPUT_OVER_RUN_ERR   0x00000020

#define SPI_ERR_INPUT_UNDER_RUN_ERR   0x00000010

#define SPI_ERR_OUTPUT_UNDER_RUN_ERR  0x00000008

#define SPI_ERR_INPUT_OVER_RUN_ERR    0x00000004

#define SPI_ERR_CLK_OVER_RUN_ERR      0x00000002

#define SPI_ERR_CLK_UNDER_RUN_ERR     0x00000001



/* We don't allow transactions larger than 4K-64 or 64K-64 due to

 * mx_input/output_cnt register size

 */

#define SPI_MAX_TRANSFERS             (QSD_REG(0xFC0) QUP_REG(0xFC0))

#define SPI_MAX_LEN                   (SPI_MAX_TRANSFERS * dd->bytes_per_word)



#define SPI_NUM_CHIPSELECTS           4

#define SPI_SUPPORTED_MODES  (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP)



/* high speed mode is when bus rate is greater then 26MHz */

#define SPI_HS_MIN_RATE               (26000000)



#define SPI_DELAY_THRESHOLD           1

/* Default timeout is 10 milliseconds */

#define SPI_DEFAULT_TIMEOUT           10

/* 250 microseconds */

#define SPI_TRYLOCK_DELAY             250



/* Data Mover burst size */

#define DM_BURST_SIZE                 16

/* Data Mover commands should be aligned to 64 bit(8 bytes) */

#define DM_BYTE_ALIGN                 8



#if defined(CONFIG_ARM64) || defined(CONFIG_LPAE)

#define spi_dma_mask(dev)   (dma_set_mask((dev), DMA_BIT_MASK(36)))

#else

#define spi_dma_mask(dev)   (dma_set_mask((dev), DMA_BIT_MASK(32)))

#endif





enum msm_spi_qup_version {

	SPI_QUP_VERSION_NONE    = 0x0,

	SPI_QUP_VERSION_BFAM    = 0x2,

};



enum msm_spi_pipe_direction {

	SPI_BAM_CONSUMER_PIPE   = 0x0,

	SPI_BAM_PRODUCER_PIPE   = 0x1,

};



#define SPI_BAM_MAX_DESC_NUM      32

#define SPI_MAX_TRFR_BTWN_RESETS  ((64 * 1024) - 16)  /* 64KB - 16byte */



enum msm_spi_clk_path_vec_idx {

	MSM_SPI_CLK_PATH_SUSPEND_VEC = 0,

	MSM_SPI_CLK_PATH_RESUME_VEC  = 1,

};

#define MSM_SPI_CLK_PATH_AVRG_BW(dd) (76800000)

#define MSM_SPI_CLK_PATH_BRST_BW(dd) (76800000)



static char const * const spi_rsrcs[] = {

	"spi_clk",

	"spi_miso",

	"spi_mosi"

};



static char const * const spi_cs_rsrcs[] = {

	"spi_cs",

	"spi_cs1",

	"spi_cs2",

	"spi_cs3",

};



enum msm_spi_mode {

	SPI_FIFO_MODE  = 0x0,  /* 00 */

	SPI_BLOCK_MODE = 0x1,  /* 01 */

	SPI_BAM_MODE   = 0x3,  /* 11 */

	SPI_MODE_NONE  = 0xFF, /* invalid value */

};



/* Structure for SPI CS GPIOs */

struct spi_cs_gpio {

	int  gpio_num;

	bool valid;

};



#ifdef CONFIG_DEBUG_FS

struct msm_spi_debugfs_data {

	int offset;

	struct msm_spi *dd;

};

/* Used to create debugfs entries */

static struct msm_spi_regs{

	const char *name;

	mode_t mode;

	int offset;

} debugfs_spi_regs[] = {

	{"config",               0644,  SPI_CONFIG },

	{"io_control",           0644,  SPI_IO_CONTROL },

	{"io_modes",             0644,  SPI_IO_MODES },

	{"sw_reset",             0200,  SPI_SW_RESET },

	{"time_out_current",     0444,  SPI_TIME_OUT_CURRENT },

	{"mx_output_count",      0644,  SPI_MX_OUTPUT_COUNT },

	{"mx_output_cnt_current", 0444, SPI_MX_OUTPUT_CNT_CURRENT },

	{"mx_input_count",       0644,  SPI_MX_INPUT_COUNT },

	{"mx_input_cnt_current", 0444,  SPI_MX_INPUT_CNT_CURRENT },

	{"mx_read_count",        0644,  SPI_MX_READ_COUNT },

	{"mx_read_cnt_current",  0444,  SPI_MX_READ_CNT_CURRENT },

	{"operational",          0644,  SPI_OPERATIONAL },

	{"error_flags",          0644,  SPI_ERROR_FLAGS },

	{"error_flags_en",       0644,  SPI_ERROR_FLAGS_EN },

	{"deassert_wait",        0644,  SPI_DEASSERT_WAIT },

	{"output_debug",         0444,  SPI_OUTPUT_DEBUG },

	{"input_debug",          0444,  SPI_INPUT_DEBUG },

	{"test_ctrl",            0644,  SPI_TEST_CTRL },

	{"output_fifo",          0200,  SPI_OUTPUT_FIFO },

	{"input_fifo",           0400,  SPI_INPUT_FIFO },

	{"spi_state",            0644,  SPI_STATE },

#if IS_ENABLED(CONFIG_SPI_QSD) || IS_ENABLED(CONFIG_SPI_QSD_MODULE)

	{"fifo_word_cnt",        0444,  SPI_FIFO_WORD_CNT},

#else

	{"qup_config",           0644,  QUP_CONFIG},

	{"qup_error_flags",      0644,  QUP_ERROR_FLAGS},

	{"qup_error_flags_en",   0644,  QUP_ERROR_FLAGS_EN},

	{"mx_write_cnt",         0644,  QUP_MX_WRITE_COUNT},

	{"mx_write_cnt_current", 0444,  QUP_MX_WRITE_CNT_CURRENT},

	{"output_fifo_word_cnt", 0444,  SPI_OUTPUT_FIFO_WORD_CNT},

	{"input_fifo_word_cnt",  0444,  SPI_INPUT_FIFO_WORD_CNT},

#endif

};

#endif



struct msm_spi_bam_pipe {

	const char              *name;

	struct sps_pipe         *handle;

	struct sps_connect       config;

	bool                     teardown_required;

};



struct msm_spi_bam {

	void __iomem            *base;

	phys_addr_t              phys_addr;

	uintptr_t                handle;

	int                      irq;

	struct msm_spi_bam_pipe  prod;

	struct msm_spi_bam_pipe  cons;

	bool                     deregister_required;

	u32			 curr_rx_bytes_recvd;

	u32			 curr_tx_bytes_sent;

	u32			 bam_rx_len;

	u32			 bam_tx_len;

};



struct msm_spi {

	u8                      *read_buf;

	const u8                *write_buf;

	void __iomem            *base;

	struct device           *dev;

	spinlock_t               queue_lock;

	struct mutex             core_lock;

	struct spi_device       *spi;

	struct spi_transfer     *cur_transfer;

	struct completion        tx_transfer_complete;

	struct completion        rx_transfer_complete;

	struct clk              *clk;    /* core clock */

	struct clk              *pclk;   /* interface clock */

	struct msm_bus_client_handle *bus_cl_hdl;

	unsigned long            mem_phys_addr;

	size_t                   mem_size;

	int                      input_fifo_size;

	int                      output_fifo_size;

	u32                      rx_bytes_remaining;

	u32                      tx_bytes_remaining;

	u32                      clock_speed;

	int                      irq_in;

	int                      read_xfr_cnt;

	int                      write_xfr_cnt;

	int                      write_len;

	int                      read_len;

#if IS_ENABLED(CONFIG_SPI_QSD) || IS_ENABLED(CONFIG_SPI_QSD_MODULE)

	int                      irq_out;

	int                      irq_err;

#endif

	int                      bytes_per_word;

	bool                     suspended;

	bool                     transfer_pending;

	wait_queue_head_t        continue_suspend;

	/* DMA data */

	enum msm_spi_mode        tx_mode;

	enum msm_spi_mode        rx_mode;

	bool                     use_dma;

	int                      tx_dma_chan;

	int                      tx_dma_crci;

	int                      rx_dma_chan;

	int                      rx_dma_crci;

	int                      (*dma_init)(struct msm_spi *dd);

	void                     (*dma_teardown)(struct msm_spi *dd);

	struct msm_spi_bam       bam;

	int                      input_block_size;

	int                      output_block_size;

	int                      input_burst_size;

	int                      output_burst_size;

	atomic_t                 rx_irq_called;

	atomic_t                 tx_irq_called;

	/* Used to pad messages unaligned to block size */

	u8                       *tx_padding;

	dma_addr_t               tx_padding_dma;

	u8                       *rx_padding;

	dma_addr_t               rx_padding_dma;

	u32                      tx_unaligned_len;

	u32                      rx_unaligned_len;

	/* DMA statistics */

	int                      stat_rx;

	int                      stat_tx;

#ifdef CONFIG_DEBUG_FS

	struct dentry *dent_spi;

	struct dentry *debugfs_spi_regs[ARRAY_SIZE(debugfs_spi_regs)];

	struct msm_spi_debugfs_data reg_data[ARRAY_SIZE(debugfs_spi_regs)];

#endif

	struct msm_spi_platform_data *pdata; /* Platform data */

	/* When set indicates multiple transfers in a single message */

	bool                     rx_done;

	bool                     tx_done;

	u32                      cur_msg_len;

	/* Used in FIFO mode to keep track of the transfer being processed */

	struct spi_transfer     *cur_tx_transfer;

	struct spi_transfer     *cur_rx_transfer;

	/* Temporary buffer used for WR-WR or WR-RD transfers */

	u8                      *temp_buf;

	/* GPIO pin numbers for SPI clk, miso and mosi */

	int                      spi_gpios[ARRAY_SIZE(spi_rsrcs)];

	/* SPI CS GPIOs for each slave */

	struct spi_cs_gpio       cs_gpios[ARRAY_SIZE(spi_cs_rsrcs)];

	enum msm_spi_qup_version qup_ver;

	int			 max_trfr_len;

	u16			 xfrs_delay_usec;

	struct pinctrl		*pinctrl;

	struct pinctrl_state	*pins_active;

	struct pinctrl_state	*pins_sleep;

	bool			is_init_complete;

	bool			pack_words;

};



/* Forward declaration */

static irqreturn_t msm_spi_input_irq(int irq, void *dev_id);

static irqreturn_t msm_spi_output_irq(int irq, void *dev_id);

static irqreturn_t msm_spi_error_irq(int irq, void *dev_id);

static inline int msm_spi_set_state(struct msm_spi *dd,

				    enum msm_spi_state state);

static void msm_spi_write_word_to_fifo(struct msm_spi *dd);

static inline void msm_spi_write_rmn_to_fifo(struct msm_spi *dd);

static irqreturn_t msm_spi_qup_irq(int irq, void *dev_id);



#if IS_ENABLED(CONFIG_SPI_QSD) || IS_ENABLED(CONFIG_SPI_QSD_MODULE)

static inline void msm_spi_disable_irqs(struct msm_spi *dd)

{

	disable_irq(dd->irq_in);

	disable_irq(dd->irq_out);

	disable_irq(dd->irq_err);

}



static inline void msm_spi_enable_irqs(struct msm_spi *dd)

{

	enable_irq(dd->irq_in);

	enable_irq(dd->irq_out);

	enable_irq(dd->irq_err);

}



static inline int msm_spi_request_irq(struct msm_spi *dd,

				struct platform_device *pdev,

				struct spi_master *master)

{

	int rc;



	dd->irq_in  = platform_get_irq(pdev, 0);

	dd->irq_out = platform_get_irq(pdev, 1);

	dd->irq_err = platform_get_irq(pdev, 2);

	if ((dd->irq_in < 0) || (dd->irq_out < 0) || (dd->irq_err < 0))

		return -EINVAL;



	rc = devm_request_irq(dd->dev, dd->irq_in, msm_spi_input_irq,

		IRQF_TRIGGER_RISING, pdev->name, dd);

	if (rc)

		goto error_irq;



	rc = devm_request_irq(dd->dev, dd->irq_out, msm_spi_output_irq,

		IRQF_TRIGGER_RISING, pdev->name, dd);

	if (rc)

		goto error_irq;



	rc = devm_request_irq(dd->dev, dd->irq_err, msm_spi_error_irq,

		IRQF_TRIGGER_RISING, pdev->name, master);

	if (rc)

		goto error_irq;



error_irq:

	return rc;

}



static inline void msm_spi_get_clk_err(struct msm_spi *dd, u32 *spi_err) {}

static inline void msm_spi_ack_clk_err(struct msm_spi *dd) {}

static inline void msm_spi_set_qup_config(struct msm_spi *dd, int bpw) {}



static inline int  msm_spi_prepare_for_write(struct msm_spi *dd) { return 0; }

static inline void msm_spi_start_write(struct msm_spi *dd, u32 read_count)

{

	msm_spi_write_word_to_fifo(dd);

}

static inline void msm_spi_set_write_count(struct msm_spi *dd, int val) {}



static inline void msm_spi_complete(struct msm_spi *dd)

{

	complete(&dd->transfer_complete);

}



static inline void msm_spi_enable_error_flags(struct msm_spi *dd)

{

	writel_relaxed(0x0000007B, dd->base + SPI_ERROR_FLAGS_EN);

}



static inline void msm_spi_clear_error_flags(struct msm_spi *dd)

{

	writel_relaxed(0x0000007F, dd->base + SPI_ERROR_FLAGS);

}



#else

/* In QUP the same interrupt line is used for input, output and error*/

static inline int msm_spi_request_irq(struct msm_spi *dd,

				struct platform_device *pdev,

				struct spi_master *master)

{

	dd->irq_in  = platform_get_irq(pdev, 0);

	if (dd->irq_in < 0)

		return -EINVAL;



	return devm_request_irq(dd->dev, dd->irq_in, msm_spi_qup_irq,

		IRQF_TRIGGER_HIGH, pdev->name, dd);

}



static inline void msm_spi_disable_irqs(struct msm_spi *dd)

{

	disable_irq(dd->irq_in);

}



static inline void msm_spi_enable_irqs(struct msm_spi *dd)

{

	enable_irq(dd->irq_in);

}



static inline void msm_spi_get_clk_err(struct msm_spi *dd, u32 *spi_err)

{

	*spi_err = readl_relaxed(dd->base + QUP_ERROR_FLAGS);

}



static inline void msm_spi_ack_clk_err(struct msm_spi *dd)

{

	writel_relaxed(QUP_ERR_MASK, dd->base + QUP_ERROR_FLAGS);

}



static inline void

msm_spi_set_bpw_and_no_io_flags(struct msm_spi *dd, u32 *config, int n);



/**

 * msm_spi_set_qup_config: set QUP_CONFIG to no_input, no_output, and N bits

 */

static inline void msm_spi_set_qup_config(struct msm_spi *dd, int bpw)

{

	u32 qup_config = readl_relaxed(dd->base + QUP_CONFIG);



	msm_spi_set_bpw_and_no_io_flags(dd, &qup_config, bpw-1);

	writel_relaxed(qup_config | QUP_CONFIG_SPI_MODE, dd->base + QUP_CONFIG);

}



static inline int msm_spi_prepare_for_write(struct msm_spi *dd)

{

	if (msm_spi_set_state(dd, SPI_OP_STATE_RUN))

		return -EINVAL;

	if (msm_spi_set_state(dd, SPI_OP_STATE_PAUSE))

		return -EINVAL;

	return 0;

}



static inline void msm_spi_start_write(struct msm_spi *dd, u32 read_count)

{

	msm_spi_write_rmn_to_fifo(dd);

}



static inline void msm_spi_set_write_count(struct msm_spi *dd, int val)

{

	writel_relaxed(val, dd->base + QUP_MX_WRITE_COUNT);

}



static inline void msm_spi_complete(struct msm_spi *dd)

{

	dd->tx_done = true;

	dd->rx_done = true;

}



static inline void msm_spi_enable_error_flags(struct msm_spi *dd)

{

	if (dd->qup_ver == SPI_QUP_VERSION_BFAM)

		writel_relaxed(

			SPI_ERR_CLK_UNDER_RUN_ERR | SPI_ERR_CLK_OVER_RUN_ERR,

			dd->base + SPI_ERROR_FLAGS_EN);

	else

		writel_relaxed(0x00000078, dd->base + SPI_ERROR_FLAGS_EN);

}



static inline void msm_spi_clear_error_flags(struct msm_spi *dd)

{

	if (dd->qup_ver == SPI_QUP_VERSION_BFAM)

		writel_relaxed(

			SPI_ERR_CLK_UNDER_RUN_ERR | SPI_ERR_CLK_OVER_RUN_ERR,

			dd->base + SPI_ERROR_FLAGS);

	else

		writel_relaxed(0x0000007C, dd->base + SPI_ERROR_FLAGS);

}



#endif

#endif

include/linux/spi/qcom-spi.h

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/* SPDX-License-Identifier: GPL-2.0-only */

/* Copyright (c) 2014-2018, 2020, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */

/*

 * SPI driver for Qualcomm Technologies, Inc. MSM platforms.

 */



/**

 * msm_spi_platform_data: msm spi-controller's configuration data

 *

 * @max_clock_speed max spi clock speed

 * @active_only when set, votes when system active and removes the vote when

 *       system goes idle (optimises for performance). When unset, voting using

 *       runtime pm (optimizes for power).

 * @master_id master id number of the controller's wrapper (BLSP or GSBI).

 *       When zero, clock path voting is disabled.

 * @gpio_config pointer to function for configuring gpio

 * @gpio_release pointer to function for releasing gpio pins

 * @dma_config function poniter for configuring dma engine

 * @pm_lat power management latency

 * @infinite_mode use FIFO mode in infinite mode

 * @ver_reg_exists if the version register exists

 * @use_beam true if BAM is available

 * @bam_consumer_pipe_index BAM conusmer pipe

 * @bam_producer_pipe_index BAM producer pipe

 * @rt_priority true if RT thread

 * @use_pinctrl true if pinctrl library is used

 * @is_shared true when qup is shared between ee's

 */

struct msm_spi_platform_data {

	u32 max_clock_speed;

	u32  master_id;

	u32 bus_width;

	int (*gpio_config)(void);

	void (*gpio_release)(void);

	int (*dma_config)(void);

	const char *rsl_id;

	u32  pm_lat;

	u32  infinite_mode;

	bool ver_reg_exists;

	bool use_bam;

	u32  bam_consumer_pipe_index;

	u32  bam_producer_pipe_index;

	bool rt_priority;

	bool use_pinctrl;

	bool is_shared;

};