Release 4.11 drivers/spi/spi-imx.c

/*
 * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
 * Copyright (C) 2008 Juergen Beisert
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the
 * Free Software Foundation
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301, USA.
 */

#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>
#include <linux/types.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>

#include <linux/platform_data/dma-imx.h>
#include <linux/platform_data/spi-imx.h>


#define DRIVER_NAME "spi_imx"


#define MXC_CSPIRXDATA		0x00

#define MXC_CSPITXDATA		0x04

#define MXC_CSPICTRL		0x08

#define MXC_CSPIINT		0x0c

#define MXC_RESET		0x1c

/* generic defines to abstract from the different register layouts */

#define MXC_INT_RR	(1 << 0) 
/* Receive data ready interrupt */

#define MXC_INT_TE	(1 << 1) 
/* Transmit FIFO empty interrupt */

/* The maximum  bytes that a sdma BD can transfer.*/

#define MAX_SDMA_BD_BYTES  (1 << 15)

struct spi_imx_config {
	
unsigned int speed_hz;
	
unsigned int bpw;
};


enum spi_imx_devtype {
	
IMX1_CSPI,
	
IMX21_CSPI,
	
IMX27_CSPI,
	
IMX31_CSPI,
	
IMX35_CSPI,	/* CSPI on all i.mx except above */
	
IMX51_ECSPI,	/* ECSPI on i.mx51 and later */
};

struct spi_imx_data;


struct spi_imx_devtype_data {
	
void (*intctrl)(struct spi_imx_data *, int);
	
int (*config)(struct spi_device *, struct spi_imx_config *);
	
void (*trigger)(struct spi_imx_data *);
	
int (*rx_available)(struct spi_imx_data *);
	
void (*reset)(struct spi_imx_data *);
	
enum spi_imx_devtype devtype;
};


struct spi_imx_data {
	
struct spi_bitbang bitbang;
	
struct device *dev;

	
struct completion xfer_done;
	
void __iomem *base;
	
unsigned long base_phys;

	
struct clk *clk_per;
	
struct clk *clk_ipg;
	
unsigned long spi_clk;
	
unsigned int spi_bus_clk;

	
unsigned int bytes_per_word;

	
unsigned int count;
	
void (*tx)(struct spi_imx_data *);
	
void (*rx)(struct spi_imx_data *);
	
void *rx_buf;
	
const void *tx_buf;
	
unsigned int txfifo; /* number of words pushed in tx FIFO */

	/* DMA */
	
bool usedma;
	
u32 wml;
	
struct completion dma_rx_completion;
	
struct completion dma_tx_completion;

	
const struct spi_imx_devtype_data *devtype_data;
};



static inline int is_imx27_cspi(struct spi_imx_data *d)
{
	return d->devtype_data->devtype == IMX27_CSPI;
}

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static inline int is_imx35_cspi(struct spi_imx_data *d)
{
	return d->devtype_data->devtype == IMX35_CSPI;
}

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static inline int is_imx51_ecspi(struct spi_imx_data *d)
{
	return d->devtype_data->devtype == IMX51_ECSPI;
}

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static inline unsigned spi_imx_get_fifosize(struct spi_imx_data *d)
{
	return is_imx51_ecspi(d) ? 64 : 8;
}

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#define MXC_SPI_BUF_RX(type)						\
static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx)         \
{                                                                       \
        unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA);       \
                                                                        \
        if (spi_imx->rx_buf) {                                          \
                *(type *)spi_imx->rx_buf = val;                         \
                spi_imx->rx_buf += sizeof(type);                        \
        }                                                               \
}


#define MXC_SPI_BUF_TX(type)						\
static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx)         \
{                                                                       \
        type val = 0;                                                   \
                                                                        \
        if (spi_imx->tx_buf) {                                          \
                val = *(type *)spi_imx->tx_buf;                         \
                spi_imx->tx_buf += sizeof(type);                        \
        }                                                               \
                                                                        \
        spi_imx->count -= sizeof(type);                                 \
                                                                        \
        writel(val, spi_imx->base + MXC_CSPITXDATA);                    \
}

MXC_SPI_BUF_RX(u8)
MXC_SPI_BUF_TX(u8)
MXC_SPI_BUF_RX(u16)
MXC_SPI_BUF_TX(u16)
MXC_SPI_BUF_RX(u32)
MXC_SPI_BUF_TX(u32)

/* First entry is reserved, second entry is valid only if SDHC_SPIEN is set
 * (which is currently not the case in this driver)
 */

static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192,
	256, 384, 512, 768, 1024};

/* MX21, MX27 */


static unsigned int spi_imx_clkdiv_1(unsigned int fin,
		unsigned int fspi, unsigned int max, unsigned int *fres)
{
	int i;

	for (i = 2; i < max; i++)
		if (fspi * mxc_clkdivs[i] >= fin)
			break;

	*fres = fin / mxc_clkdivs[i];
	return i;
}

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/* MX1, MX31, MX35, MX51 CSPI */


static unsigned int spi_imx_clkdiv_2(unsigned int fin,
		unsigned int fspi, unsigned int *fres)
{
	int i, div = 4;

	for (i = 0; i < 7; i++) {
		if (fspi * div >= fin)
			goto out;
		div <<= 1;
	}

out:
	*fres = fin / div;
	return i;
}

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static int spi_imx_bytes_per_word(const int bpw)
{
	return DIV_ROUND_UP(bpw, BITS_PER_BYTE);
}

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static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi,
			 struct spi_transfer *transfer)
{
	struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
	unsigned int bpw, i;

	if (!master->dma_rx)
		return false;

	if (!transfer)
		return false;

	bpw = transfer->bits_per_word;
	if (!bpw)
		bpw = spi->bits_per_word;

	bpw = spi_imx_bytes_per_word(bpw);

	if (bpw != 1 && bpw != 2 && bpw != 4)
		return false;

	for (i = spi_imx_get_fifosize(spi_imx) / 2; i > 0; i--) {
		if (!(transfer->len % (i * bpw)))
			break;
	}

	if (i == 0)
		return false;

	spi_imx->wml = i;

	return true;
}

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#define MX51_ECSPI_CTRL		0x08

#define MX51_ECSPI_CTRL_ENABLE		(1 <<  0)

#define MX51_ECSPI_CTRL_XCH		(1 <<  2)

#define MX51_ECSPI_CTRL_SMC		(1 << 3)

#define MX51_ECSPI_CTRL_MODE_MASK	(0xf << 4)

#define MX51_ECSPI_CTRL_POSTDIV_OFFSET	8

#define MX51_ECSPI_CTRL_PREDIV_OFFSET	12

#define MX51_ECSPI_CTRL_CS(cs)		((cs) << 18)

#define MX51_ECSPI_CTRL_BL_OFFSET	20


#define MX51_ECSPI_CONFIG	0x0c

#define MX51_ECSPI_CONFIG_SCLKPHA(cs)	(1 << ((cs) +  0))

#define MX51_ECSPI_CONFIG_SCLKPOL(cs)	(1 << ((cs) +  4))

#define MX51_ECSPI_CONFIG_SBBCTRL(cs)	(1 << ((cs) +  8))

#define MX51_ECSPI_CONFIG_SSBPOL(cs)	(1 << ((cs) + 12))

#define MX51_ECSPI_CONFIG_SCLKCTL(cs)	(1 << ((cs) + 20))


#define MX51_ECSPI_INT		0x10

#define MX51_ECSPI_INT_TEEN		(1 <<  0)

#define MX51_ECSPI_INT_RREN		(1 <<  3)


#define MX51_ECSPI_DMA      0x14

#define MX51_ECSPI_DMA_TX_WML(wml)	((wml) & 0x3f)

#define MX51_ECSPI_DMA_RX_WML(wml)	(((wml) & 0x3f) << 16)

#define MX51_ECSPI_DMA_RXT_WML(wml)	(((wml) & 0x3f) << 24)


#define MX51_ECSPI_DMA_TEDEN		(1 << 7)

#define MX51_ECSPI_DMA_RXDEN		(1 << 23)

#define MX51_ECSPI_DMA_RXTDEN		(1 << 31)


#define MX51_ECSPI_STAT		0x18

#define MX51_ECSPI_STAT_RR		(1 <<  3)


#define MX51_ECSPI_TESTREG	0x20

#define MX51_ECSPI_TESTREG_LBC	BIT(31)

/* MX51 eCSPI */


static unsigned int mx51_ecspi_clkdiv(struct spi_imx_data *spi_imx,
				      unsigned int fspi, unsigned int *fres)
{
	/*
         * there are two 4-bit dividers, the pre-divider divides by
         * $pre, the post-divider by 2^$post
         */
	unsigned int pre, post;
	unsigned int fin = spi_imx->spi_clk;

	if (unlikely(fspi > fin))
		return 0;

	post = fls(fin) - fls(fspi);
	if (fin > fspi << post)
		post++;

	/* now we have: (fin <= fspi << post) with post being minimal */

	post = max(4U, post) - 4;
	if (unlikely(post > 0xf)) {
		dev_err(spi_imx->dev, "cannot set clock freq: %u (base freq: %u)\n",
				fspi, fin);
		return 0xff;
	}

	pre = DIV_ROUND_UP(fin, fspi << post) - 1;

	dev_dbg(spi_imx->dev, "%s: fin: %u, fspi: %u, post: %u, pre: %u\n",
			__func__, fin, fspi, post, pre);

	/* Resulting frequency for the SCLK line. */
	*fres = (fin / (pre + 1)) >> post;

	return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) |
		(post << MX51_ECSPI_CTRL_POSTDIV_OFFSET);
}

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static void mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable)
{
	unsigned val = 0;

	if (enable & MXC_INT_TE)
		val |= MX51_ECSPI_INT_TEEN;

	if (enable & MXC_INT_RR)
		val |= MX51_ECSPI_INT_RREN;

	writel(val, spi_imx->base + MX51_ECSPI_INT);
}

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static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
{
	u32 reg;

	reg = readl(spi_imx->base + MX51_ECSPI_CTRL);
	reg |= MX51_ECSPI_CTRL_XCH;
	writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
}

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static int mx51_ecspi_config(struct spi_device *spi,
			     struct spi_imx_config *config)
{
	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
	u32 ctrl = MX51_ECSPI_CTRL_ENABLE;
	u32 clk = config->speed_hz, delay, reg;
	u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);

	/*
         * The hardware seems to have a race condition when changing modes. The
         * current assumption is that the selection of the channel arrives
         * earlier in the hardware than the mode bits when they are written at
         * the same time.
         * So set master mode for all channels as we do not support slave mode.
         */
	ctrl |= MX51_ECSPI_CTRL_MODE_MASK;

	/* set clock speed */
	ctrl |= mx51_ecspi_clkdiv(spi_imx, config->speed_hz, &clk);
	spi_imx->spi_bus_clk = clk;

	/* set chip select to use */
	ctrl |= MX51_ECSPI_CTRL_CS(spi->chip_select);

	ctrl |= (config->bpw - 1) << MX51_ECSPI_CTRL_BL_OFFSET;

	cfg |= MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select);

	if (spi->mode & SPI_CPHA)
		cfg |= MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
	else
		cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);

	if (spi->mode & SPI_CPOL) {
		cfg |= MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select);
		cfg |= MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select);
	} else {
		cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select);
		cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select);
	}
	if (spi->mode & SPI_CS_HIGH)
		cfg |= MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select);
	else
		cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select);

	if (spi_imx->usedma)
		ctrl |= MX51_ECSPI_CTRL_SMC;

	/* CTRL register always go first to bring out controller from reset */
	writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);

	reg = readl(spi_imx->base + MX51_ECSPI_TESTREG);
	if (spi->mode & SPI_LOOP)
		reg |= MX51_ECSPI_TESTREG_LBC;
	else
		reg &= ~MX51_ECSPI_TESTREG_LBC;
	writel(reg, spi_imx->base + MX51_ECSPI_TESTREG);

	writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);

	/*
         * Wait until the changes in the configuration register CONFIGREG
         * propagate into the hardware. It takes exactly one tick of the
         * SCLK clock, but we will wait two SCLK clock just to be sure. The
         * effect of the delay it takes for the hardware to apply changes
         * is noticable if the SCLK clock run very slow. In such a case, if
         * the polarity of SCLK should be inverted, the GPIO ChipSelect might
         * be asserted before the SCLK polarity changes, which would disrupt
         * the SPI communication as the device on the other end would consider
         * the change of SCLK polarity as a clock tick already.
         */
	delay = (2 * 1000000) / clk;
	if (likely(delay < 10))	/* SCLK is faster than 100 kHz */
		udelay(delay);
	else			/* SCLK is _very_ slow */
		usleep_range(delay, delay + 10);

	/*
         * Configure the DMA register: setup the watermark
         * and enable DMA request.
         */

	writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml) |
		MX51_ECSPI_DMA_TX_WML(spi_imx->wml) |
		MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) |
		MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN |
		MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA);

	return 0;
}

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static int mx51_ecspi_rx_available(struct spi_imx_data *spi_imx)
{
	return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR;
}

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static void mx51_ecspi_reset(struct spi_imx_data *spi_imx)
{
	/* drain receive buffer */
	while (mx51_ecspi_rx_available(spi_imx))
		readl(spi_imx->base + MXC_CSPIRXDATA);
}

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#define MX31_INTREG_TEEN	(1 << 0)

#define MX31_INTREG_RREN	(1 << 3)


#define MX31_CSPICTRL_ENABLE	(1 << 0)

#define MX31_CSPICTRL_MASTER	(1 << 1)

#define MX31_CSPICTRL_XCH	(1 << 2)

#define MX31_CSPICTRL_SMC	(1 << 3)

#define MX31_CSPICTRL_POL	(1 << 4)

#define MX31_CSPICTRL_PHA	(1 << 5)

#define MX31_CSPICTRL_SSCTL	(1 << 6)

#define MX31_CSPICTRL_SSPOL	(1 << 7)

#define MX31_CSPICTRL_BC_SHIFT	8

#define MX35_CSPICTRL_BL_SHIFT	20

#define MX31_CSPICTRL_CS_SHIFT	24

#define MX35_CSPICTRL_CS_SHIFT	12

#define MX31_CSPICTRL_DR_SHIFT	16


#define MX31_CSPI_DMAREG	0x10

#define MX31_DMAREG_RH_DEN	(1<<4)

#define MX31_DMAREG_TH_DEN	(1<<1)


#define MX31_CSPISTATUS		0x14

#define MX31_STATUS_RR		(1 << 3)


#define MX31_CSPI_TESTREG	0x1C

#define MX31_TEST_LBC		(1 << 14)

/* These functions also work for the i.MX35, but be aware that
 * the i.MX35 has a slightly different register layout for bits
 * we do not use here.
 */


static void mx31_intctrl(struct spi_imx_data *spi_imx, int enable)
{
	unsigned int val = 0;

	if (enable & MXC_INT_TE)
		val |= MX31_INTREG_TEEN;
	if (enable & MXC_INT_RR)
		val |= MX31_INTREG_RREN;

	writel(val, spi_imx->base + MXC_CSPIINT);
}

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static void mx31_trigger(struct spi_imx_data *spi_imx)
{
	unsigned int reg;

	reg = readl(spi_imx->base + MXC_CSPICTRL);
	reg |= MX31_CSPICTRL_XCH;
	writel(reg, spi_imx->base + MXC_CSPICTRL);
}

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static int mx31_config(struct spi_device *spi, struct spi_imx_config *config)
{
	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
	unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER;
	unsigned int clk;

	reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz, &clk) <<
		MX31_CSPICTRL_DR_SHIFT;
	spi_imx->spi_bus_clk = clk;

	if (is_imx35_cspi(spi_imx)) {
		reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT;
		reg |= MX31_CSPICTRL_SSCTL;
	} else {
		reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT;
	}

	if (spi->mode & SPI_CPHA)
		reg |= MX31_CSPICTRL_PHA;
	if (spi->mode & SPI_CPOL)
		reg |= MX31_CSPICTRL_POL;
	if (spi->mode & SPI_CS_HIGH)
		reg |= MX31_CSPICTRL_SSPOL;
	if (spi->cs_gpio < 0)
		reg |= (spi->cs_gpio + 32) <<
			(is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT :
						  MX31_CSPICTRL_CS_SHIFT);

	if (spi_imx->usedma)
		reg |= MX31_CSPICTRL_SMC;

	writel(reg, spi_imx->base + MXC_CSPICTRL);

	reg = readl(spi_imx->base + MX31_CSPI_TESTREG);
	if (spi->mode & SPI_LOOP)
		reg |= MX31_TEST_LBC;
	else
		reg &= ~MX31_TEST_LBC;
	writel(reg, spi_imx->base + MX31_CSPI_TESTREG);

	if (spi_imx->usedma) {
		/* configure DMA requests when RXFIFO is half full and
                   when TXFIFO is half empty */
		writel(MX31_DMAREG_RH_DEN | MX31_DMAREG_TH_DEN,
			spi_imx->base + MX31_CSPI_DMAREG);
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
115
45.10%
1
10.00%
Martin Kaiser
85
33.33%
3
30.00%
Shawn Guo
23
9.02%
2
20.00%
Alexander Shiyan
23
9.02%
2
20.00%
Uwe Kleine-König
9
3.53%
2
20.00%
Total
255
100.00%
10
100.00%



static int mx31_rx_available(struct spi_imx_data *spi_imx)
{
	return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
20
86.96%
1
50.00%
Uwe Kleine-König
3
13.04%
1
50.00%
Total
23
100.00%
2
100.00%



static void mx31_reset(struct spi_imx_data *spi_imx)
{
	/* drain receive buffer */
	while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR)
		readl(spi_imx->base + MXC_CSPIRXDATA);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Uwe Kleine-König
31
91.18%
1
50.00%
Shawn Guo
3
8.82%
1
50.00%
Total
34
100.00%
2
100.00%


#define MX21_INTREG_RR		(1 << 4)

#define MX21_INTREG_TEEN	(1 << 9)

#define MX21_INTREG_RREN	(1 << 13)


#define MX21_CSPICTRL_POL	(1 << 5)

#define MX21_CSPICTRL_PHA	(1 << 6)

#define MX21_CSPICTRL_SSPOL	(1 << 8)

#define MX21_CSPICTRL_XCH	(1 << 9)

#define MX21_CSPICTRL_ENABLE	(1 << 10)

#define MX21_CSPICTRL_MASTER	(1 << 11)

#define MX21_CSPICTRL_DR_SHIFT	14

#define MX21_CSPICTRL_CS_SHIFT	19



static void mx21_intctrl(struct spi_imx_data *spi_imx, int enable)
{
	unsigned int val = 0;

	if (enable & MXC_INT_TE)
		val |= MX21_INTREG_TEEN;
	if (enable & MXC_INT_RR)
		val |= MX21_INTREG_RREN;

	writel(val, spi_imx->base + MXC_CSPIINT);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
45
88.24%
1
33.33%
Uwe Kleine-König
3
5.88%
1
33.33%
Shawn Guo
3
5.88%
1
33.33%
Total
51
100.00%
3
100.00%



static void mx21_trigger(struct spi_imx_data *spi_imx)
{
	unsigned int reg;

	reg = readl(spi_imx->base + MXC_CSPICTRL);
	reg |= MX21_CSPICTRL_XCH;
	writel(reg, spi_imx->base + MXC_CSPICTRL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
35
85.37%
1
33.33%
Uwe Kleine-König
4
9.76%
1
33.33%
Shawn Guo
2
4.88%
1
33.33%
Total
41
100.00%
3
100.00%



static int mx21_config(struct spi_device *spi, struct spi_imx_config *config)
{
	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
	unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
	unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
	unsigned int clk;

	reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max, &clk)
		<< MX21_CSPICTRL_DR_SHIFT;
	spi_imx->spi_bus_clk = clk;

	reg |= config->bpw - 1;

	if (spi->mode & SPI_CPHA)
		reg |= MX21_CSPICTRL_PHA;
	if (spi->mode & SPI_CPOL)
		reg |= MX21_CSPICTRL_POL;
	if (spi->mode & SPI_CS_HIGH)
		reg |= MX21_CSPICTRL_SSPOL;
	if (spi->cs_gpio < 0)
		reg |= (spi->cs_gpio + 32) << MX21_CSPICTRL_CS_SHIFT;

	writel(reg, spi_imx->base + MXC_CSPICTRL);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
94
59.87%
1
14.29%
Shawn Guo
23
14.65%
2
28.57%
Alexander Shiyan
23
14.65%
2
28.57%
Robert Baldyga
13
8.28%
1
14.29%
Uwe Kleine-König
4
2.55%
1
14.29%
Total
157
100.00%
7
100.00%



static int mx21_rx_available(struct spi_imx_data *spi_imx)
{
	return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
18
78.26%
1
33.33%
Uwe Kleine-König
3
13.04%
1
33.33%
Shawn Guo
2
8.70%
1
33.33%
Total
23
100.00%
3
100.00%



static void mx21_reset(struct spi_imx_data *spi_imx)
{
	writel(1, spi_imx->base + MXC_RESET);
}

Contributors
Person
Tokens
Prop
Commits
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Uwe Kleine-König
21
95.45%
1
50.00%
Shawn Guo
1
4.55%
1
50.00%
Total
22
100.00%
2
100.00%


#define MX1_INTREG_RR		(1 << 3)

#define MX1_INTREG_TEEN		(1 << 8)

#define MX1_INTREG_RREN		(1 << 11)


#define MX1_CSPICTRL_POL	(1 << 4)

#define MX1_CSPICTRL_PHA	(1 << 5)

#define MX1_CSPICTRL_XCH	(1 << 8)

#define MX1_CSPICTRL_ENABLE	(1 << 9)

#define MX1_CSPICTRL_MASTER	(1 << 10)

#define MX1_CSPICTRL_DR_SHIFT	13



static void mx1_intctrl(struct spi_imx_data *spi_imx, int enable)
{
	unsigned int val = 0;

	if (enable & MXC_INT_TE)
		val |= MX1_INTREG_TEEN;
	if (enable & MXC_INT_RR)
		val |= MX1_INTREG_RREN;

	writel(val, spi_imx->base + MXC_CSPIINT);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
48
94.12%
1
50.00%
Uwe Kleine-König
3
5.88%
1
50.00%
Total
51
100.00%
2
100.00%



static void mx1_trigger(struct spi_imx_data *spi_imx)
{
	unsigned int reg;

	reg = readl(spi_imx->base + MXC_CSPICTRL);
	reg |= MX1_CSPICTRL_XCH;
	writel(reg, spi_imx->base + MXC_CSPICTRL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
37
90.24%
1
50.00%
Uwe Kleine-König
4
9.76%
1
50.00%
Total
41
100.00%
2
100.00%



static int mx1_config(struct spi_device *spi, struct spi_imx_config *config)
{
	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
	unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER;
	unsigned int clk;

	reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz, &clk) <<
		MX1_CSPICTRL_DR_SHIFT;
	spi_imx->spi_bus_clk = clk;

	reg |= config->bpw - 1;

	if (spi->mode & SPI_CPHA)
		reg |= MX1_CSPICTRL_PHA;
	if (spi->mode & SPI_CPOL)
		reg |= MX1_CSPICTRL_POL;

	writel(reg, spi_imx->base + MXC_CSPICTRL);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
77
70.00%
1
20.00%
Alexander Shiyan
16
14.55%
2
40.00%
Martin Kaiser
13
11.82%
1
20.00%
Uwe Kleine-König
4
3.64%
1
20.00%
Total
110
100.00%
5
100.00%



static int mx1_rx_available(struct spi_imx_data *spi_imx)
{
	return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
20
86.96%
1
50.00%
Uwe Kleine-König
3
13.04%
1
50.00%
Total
23
100.00%
2
100.00%



static void mx1_reset(struct spi_imx_data *spi_imx)
{
	writel(1, spi_imx->base + MXC_RESET);
}

Contributors
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Uwe Kleine-König
22
100.00%
1
100.00%
Total
22
100.00%
1
100.00%


static struct spi_imx_devtype_data imx1_cspi_devtype_data = {
	.intctrl = mx1_intctrl,
	.config = mx1_config,
	.trigger = mx1_trigger,
	.rx_available = mx1_rx_available,
	.reset = mx1_reset,
	.devtype = IMX1_CSPI,
};


static struct spi_imx_devtype_data imx21_cspi_devtype_data = {
	.intctrl = mx21_intctrl,
	.config = mx21_config,
	.trigger = mx21_trigger,
	.rx_available = mx21_rx_available,
	.reset = mx21_reset,
	.devtype = IMX21_CSPI,
};


static struct spi_imx_devtype_data imx27_cspi_devtype_data = {
	/* i.mx27 cspi shares the functions with i.mx21 one */
	.intctrl = mx21_intctrl,
	.config = mx21_config,
	.trigger = mx21_trigger,
	.rx_available = mx21_rx_available,
	.reset = mx21_reset,
	.devtype = IMX27_CSPI,
};


static struct spi_imx_devtype_data imx31_cspi_devtype_data = {
	.intctrl = mx31_intctrl,
	.config = mx31_config,
	.trigger = mx31_trigger,
	.rx_available = mx31_rx_available,
	.reset = mx31_reset,
	.devtype = IMX31_CSPI,
};


static struct spi_imx_devtype_data imx35_cspi_devtype_data = {
	/* i.mx35 and later cspi shares the functions with i.mx31 one */
	.intctrl = mx31_intctrl,
	.config = mx31_config,
	.trigger = mx31_trigger,
	.rx_available = mx31_rx_available,
	.reset = mx31_reset,
	.devtype = IMX35_CSPI,
};


static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
	.intctrl = mx51_ecspi_intctrl,
	.config = mx51_ecspi_config,
	.trigger = mx51_ecspi_trigger,
	.rx_available = mx51_ecspi_rx_available,
	.reset = mx51_ecspi_reset,
	.devtype = IMX51_ECSPI,
};


static const struct platform_device_id spi_imx_devtype[] = {
	{
		.name = "imx1-cspi",
		.driver_data = (kernel_ulong_t) &imx1_cspi_devtype_data,
        }, {
		.name = "imx21-cspi",
		.driver_data = (kernel_ulong_t) &imx21_cspi_devtype_data,
        }, {
		.name = "imx27-cspi",
		.driver_data = (kernel_ulong_t) &imx27_cspi_devtype_data,
        }, {
		.name = "imx31-cspi",
		.driver_data = (kernel_ulong_t) &imx31_cspi_devtype_data,
        }, {
		.name = "imx35-cspi",
		.driver_data = (kernel_ulong_t) &imx35_cspi_devtype_data,
        }, {
		.name = "imx51-ecspi",
		.driver_data = (kernel_ulong_t) &imx51_ecspi_devtype_data,
        }, {
		/* sentinel */
	}
};


static const struct of_device_id spi_imx_dt_ids[] = {
	{ .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
	{ .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, },
	{ .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
	{ .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
	{ .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
	{ .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, spi_imx_dt_ids);



static void spi_imx_chipselect(struct spi_device *spi, int is_active)
{
	int active = is_active != BITBANG_CS_INACTIVE;
	int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH);

	if (!gpio_is_valid(spi->cs_gpio))
		return;

	gpio_set_value(spi->cs_gpio, dev_is_lowactive ^ active);
}

Contributors
Person
Tokens
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CommitProp
Sascha Hauer
28
50.91%
1
20.00%
Uwe Kleine-König
17
30.91%
2
40.00%
Alexander Shiyan
6
10.91%
1
20.00%
Jason (Hui) Wang
4
7.27%
1
20.00%
Total
55
100.00%
5
100.00%



static void spi_imx_push(struct spi_imx_data *spi_imx)
{
	while (spi_imx->txfifo < spi_imx_get_fifosize(spi_imx)) {
		if (!spi_imx->count)
			break;
		spi_imx->tx(spi_imx);
		spi_imx->txfifo++;
	}

	spi_imx->devtype_data->trigger(spi_imx);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
37
69.81%
1
16.67%
Uwe Kleine-König
11
20.75%
2
33.33%
Shawn Guo
4
7.55%
2
33.33%
David Jander
1
1.89%
1
16.67%
Total
53
100.00%
6
100.00%



static irqreturn_t spi_imx_isr(int irq, void *dev_id)
{
	struct spi_imx_data *spi_imx = dev_id;

	while (spi_imx->devtype_data->rx_available(spi_imx)) {
		spi_imx->rx(spi_imx);
		spi_imx->txfifo--;
	}

	if (spi_imx->count) {
		spi_imx_push(spi_imx);
		return IRQ_HANDLED;
	}

	if (spi_imx->txfifo) {
		/* No data left to push, but still waiting for rx data,
                 * enable receive data available interrupt.
                 */
		spi_imx->devtype_data->intctrl(
				spi_imx, MXC_INT_RR);
		return IRQ_HANDLED;
	}

	spi_imx->devtype_data->intctrl(spi_imx, 0);
	complete(&spi_imx->xfer_done);

	return IRQ_HANDLED;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
83
78.30%
1
25.00%
Uwe Kleine-König
20
18.87%
2
50.00%
Shawn Guo
3
2.83%
1
25.00%
Total
106
100.00%
4
100.00%



static int spi_imx_dma_configure(struct spi_master *master,
				 int bytes_per_word)
{
	int ret;
	enum dma_slave_buswidth buswidth;
	struct dma_slave_config rx = {}, tx = {};
	struct spi_imx_data *spi_imx = spi_master_get_devdata(master);

	switch (bytes_per_word) {
	case 4:
		buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
		break;
	case 2:
		buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
		break;
	case 1:
		buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
		break;
	default:
		return -EINVAL;
	}

	tx.direction = DMA_MEM_TO_DEV;
	tx.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA;
	tx.dst_addr_width = buswidth;
	tx.dst_maxburst = spi_imx->wml;
	ret = dmaengine_slave_config(master->dma_tx, &tx);
	if (ret) {
		dev_err(spi_imx->dev, "TX dma configuration failed with %d\n", ret);
		return ret;
	}

	rx.direction = DMA_DEV_TO_MEM;
	rx.src_addr = spi_imx->base_phys + MXC_CSPIRXDATA;
	rx.src_addr_width = buswidth;
	rx.src_maxburst = spi_imx->wml;
	ret = dmaengine_slave_config(master->dma_rx, &rx);
	if (ret) {
		dev_err(spi_imx->dev, "RX dma configuration failed with %d\n", ret);
		return ret;
	}

	spi_imx->bytes_per_word = bytes_per_word;

	return 0;
}

Contributors
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Anton Bondarenko
209
100.00%
1
100.00%
Total
209
100.00%
1
100.00%



static int spi_imx_setupxfer(struct spi_device *spi,
				 struct spi_transfer *t)
{
	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
	struct spi_imx_config config;
	int ret;

	config.bpw = t ? t->bits_per_word : spi->bits_per_word;
	config.speed_hz  = t ? t->speed_hz : spi->max_speed_hz;

	if (!config.speed_hz)
		config.speed_hz = spi->max_speed_hz;
	if (!config.bpw)
		config.bpw = spi->bits_per_word;

	/* Initialize the functions for transfer */
	if (config.bpw <= 8) {
		spi_imx->rx = spi_imx_buf_rx_u8;
		spi_imx->tx = spi_imx_buf_tx_u8;
	} else if (config.bpw <= 16) {
		spi_imx->rx = spi_imx_buf_rx_u16;
		spi_imx->tx = spi_imx_buf_tx_u16;
	} else {
		spi_imx->rx = spi_imx_buf_rx_u32;
		spi_imx->tx = spi_imx_buf_tx_u32;
	}

	if (spi_imx_can_dma(spi_imx->bitbang.master, spi, t))
		spi_imx->usedma = 1;
	else
		spi_imx->usedma = 0;

	if (spi_imx->usedma) {
		ret = spi_imx_dma_configure(spi->master,
					    spi_imx_bytes_per_word(config.bpw));
		if (ret)
			return ret;
	}

	spi_imx->devtype_data->config(spi, &config);

	return 0;
}

Contributors
Person
Tokens
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Sascha Hauer
124
54.39%
3
30.00%
Uwe Kleine-König
65
28.51%
3
30.00%
Anton Bondarenko
34
14.91%
1
10.00%
Sachin Kamat
3
1.32%
1
10.00%
Alexander Shiyan
1
0.44%
1
10.00%
Shawn Guo
1
0.44%
1
10.00%
Total
228
100.00%
10
100.00%



static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx)
{
	struct spi_master *master = spi_imx->bitbang.master;

	if (master->dma_rx) {
		dma_release_channel(master->dma_rx);
		master->dma_rx = NULL;
	}

	if (master->dma_tx) {
		dma_release_channel(master->dma_tx);
		master->dma_tx = NULL;
	}
}

Contributors
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Tokens
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Robin Gong
38
59.38%
1
25.00%
Sascha Hauer
24
37.50%
1
25.00%
Sachin Kamat
1
1.56%
1
25.00%
Shawn Guo
1
1.56%
1
25.00%
Total
64
100.00%
4
100.00%



static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
			     struct spi_master *master)
{
	int ret;

	/* use pio mode for i.mx6dl chip TKT238285 */
	if (of_machine_is_compatible("fsl,imx6dl"))
		return 0;

	spi_imx->wml = spi_imx_get_fifosize(spi_imx) / 2;

	/* Prepare for TX DMA: */
	master->dma_tx = dma_request_slave_channel_reason(dev, "tx");
	if (IS_ERR(master->dma_tx)) {
		ret = PTR_ERR(master->dma_tx);
		dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret);
		master->dma_tx = NULL;
		goto err;
	}

	/* Prepare for RX : */
	master->dma_rx = dma_request_slave_channel_reason(dev, "rx");
	if (IS_ERR(master->dma_rx)) {
		ret = PTR_ERR(master->dma_rx);
		dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret);
		master->dma_rx = NULL;
		goto err;
	}

	spi_imx_dma_configure(master, 1);

	init_completion(&spi_imx->dma_rx_completion);
	init_completion(&spi_imx->dma_tx_completion);
	master->can_dma = spi_imx_can_dma;
	master->max_dma_len = MAX_SDMA_BD_BYTES;
	spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX |
					 SPI_MASTER_MUST_TX;

	return 0;
err:
	spi_imx_sdma_exit(spi_imx);
	return ret;
}

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Robin Gong
140
67.96%
2
28.57%
Anton Bondarenko
54
26.21%
3
42.86%
Sascha Hauer
12
5.83%
2
28.57%
Total
206
100.00%
7
100.00%



static void spi_imx_dma_rx_callback(void *cookie)
{
	struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;

	complete(&spi_imx->dma_rx_completion);
}

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Robin Gong
30
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1
100.00%
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30
100.00%
1
100.00%



static void spi_imx_dma_tx_callback(void *cookie)
{
	struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;

	complete(&spi_imx->dma_tx_completion);
}

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Robin Gong
30
100.00%
1
100.00%
Total
30
100.00%
1
100.00%



static int spi_imx_calculate_timeout(struct spi_imx_data *spi_imx, int size)
{
	unsigned long timeout = 0;

	/* Time with actual data transfer and CS change delay related to HW */
	timeout = (8 + 4) * size / spi_imx->spi_bus_clk;

	/* Add extra second for scheduler related activities */
	timeout += 1;

	/* Double calculated timeout */
	return msecs_to_jiffies(2 * timeout * MSEC_PER_SEC);
}

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Anton Bondarenko
51
100.00%
1
100.00%
Total
51
100.00%
1
100.00%



static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
				struct spi_transfer *transfer)
{
	struct dma_async_tx_descriptor *desc_tx, *desc_rx;
	unsigned long transfer_timeout;
	unsigned long timeout;
	struct spi_master *master = spi_imx->bitbang.master;
	struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;

	/*
         * The TX DMA setup starts the transfer, so make sure RX is configured
         * before TX.
         */
	desc_rx = dmaengine_prep_slave_sg(master->dma_rx,
				rx->sgl, rx->nents, DMA_DEV_TO_MEM,
				DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
	if (!desc_rx)
		return -EINVAL;

	desc_rx->callback = spi_imx_dma_rx_callback;
	desc_rx->callback_param = (void *)spi_imx;
	dmaengine_submit(desc_rx);
	reinit_completion(&spi_imx->dma_rx_completion);
	dma_async_issue_pending(master->dma_rx);

	desc_tx = dmaengine_prep_slave_sg(master->dma_tx,
				tx->sgl, tx->nents, DMA_MEM_TO_DEV,
				DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
	if (!desc_tx) {
		dmaengine_terminate_all(master->dma_tx);
		return -EINVAL;
	}

	desc_tx->callback = spi_imx_dma_tx_callback;
	desc_tx->callback_param = (void *)spi_imx;
	dmaengine_submit(desc_tx);
	reinit_completion(&spi_imx->dma_tx_completion);
	dma_async_issue_pending(master->dma_tx);

	transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);

	/* Wait SDMA to finish the data transfer.*/
	timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion,
						transfer_timeout);
	if (!timeout) {
		dev_err(spi_imx->dev, "I/O Error in DMA TX\n");
		dmaengine_terminate_all(master->dma_tx);
		dmaengine_terminate_all(master->dma_rx);
		return -ETIMEDOUT;
	}

	timeout = wait_for_completion_timeout(&spi_imx->dma_rx_completion,
					      transfer_timeout);
	if (!timeout) {
		dev_err(&master->dev, "I/O Error in DMA RX\n");
		spi_imx->devtype_data->reset(spi_imx);
		dmaengine_terminate_all(master->dma_rx);
		return -ETIMEDOUT;
	}

	return transfer->len;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robin Gong
219
68.65%
1
14.29%
Sascha Hauer
68
21.32%
3
42.86%
Anton Bondarenko
24
7.52%
2
28.57%
Nicholas Mc Guire
8
2.51%
1
14.29%
Total
319
100.00%
7
100.00%



static int spi_imx_pio_transfer(struct spi_device *spi,
				struct spi_transfer *transfer)
{
	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
	unsigned long transfer_timeout;
	unsigned long timeout;

	spi_imx->tx_buf = transfer->tx_buf;
	spi_imx->rx_buf = transfer->rx_buf;
	spi_imx->count = transfer->len;
	spi_imx->txfifo = 0;

	reinit_completion(&spi_imx->xfer_done);

	spi_imx_push(spi_imx);

	spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE);

	transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);

	timeout = wait_for_completion_timeout(&spi_imx->xfer_done,
					      transfer_timeout);
	if (!timeout) {
		dev_err(&spi->dev, "I/O Error in PIO\n");
		spi_imx->devtype_data->reset(spi_imx);
		return -ETIMEDOUT;
	}

	return transfer->len;
}

Contributors
Person
Tokens
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CommitProp
Robin Gong
94
63.51%
1
50.00%
Christian Gmeiner
54
36.49%
1
50.00%
Total
148
100.00%
2
100.00%



static int spi_imx_transfer(struct spi_device *spi,
				struct spi_transfer *transfer)
{
	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);

	if (spi_imx->usedma)
		return spi_imx_dma_transfer(spi_imx, transfer);
	else
		return spi_imx_pio_transfer(spi, transfer);
}

Contributors
Person
Tokens
Prop
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CommitProp
Robin Gong
48
94.12%
1
33.33%
Sascha Hauer
3
5.88%
2
66.67%
Total
51
100.00%
3
100.00%



static int spi_imx_setup(struct spi_device *spi)
{
	dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__,
		 spi->mode, spi->bits_per_word, spi->max_speed_hz);

	if (gpio_is_valid(spi->cs_gpio))
		gpio_direction_output(spi->cs_gpio,
				      spi->mode & SPI_CS_HIGH ? 0 : 1);

	spi_imx_chipselect(spi, BITBANG_CS_INACTIVE);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
44
61.97%
2
28.57%
Robin Gong
13
18.31%
1
14.29%
Alexander Shiyan
6
8.45%
1
14.29%
Alberto Panizzo
4
5.63%
1
14.29%
Jason (Hui) Wang
3
4.23%
1
14.29%
Uwe Kleine-König
1
1.41%
1
14.29%
Total
71
100.00%
7
100.00%



static void spi_imx_cleanup(struct spi_device *spi)
{
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
9
90.00%
1
50.00%
Uwe Kleine-König
1
10.00%
1
50.00%
Total
10
100.00%
2
100.00%


static int

spi_imx_prepare_message(struct spi_master *master, struct spi_message *msg)
{
	struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
	int ret;

	ret = clk_enable(spi_imx->clk_per);
	if (ret)
		return ret;

	ret = clk_enable(spi_imx->clk_ipg);
	if (ret) {
		clk_disable(spi_imx->clk_per);
		return ret;
	}

	return 0;
}

Contributors
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Huang Shijie
73
100.00%
1
100.00%
Total
73
100.00%
1
100.00%


static int

spi_imx_unprepare_message(struct spi_master *master, struct spi_message *msg)
{
	struct spi_imx_data *spi_imx = spi_master_get_devdata(master);

	clk_disable(spi_imx->clk_ipg);
	clk_disable(spi_imx->clk_per);
	return 0;
}

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Huang Shijie
43
100.00%
1
100.00%
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43
100.00%
1
100.00%



static int spi_imx_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	const struct of_device_id *of_id =
			of_match_device(spi_imx_dt_ids, &pdev->dev);
	struct spi_imx_master *mxc_platform_info =
			dev_get_platdata(&pdev->dev);
	struct spi_master *master;
	struct spi_imx_data *spi_imx;
	struct resource *res;
	int i, ret, irq;

	if (!np && !mxc_platform_info) {
		dev_err(&pdev->dev, "can't get the platform data\n");
		return -EINVAL;
	}

	master = spi_alloc_master(&pdev->dev, sizeof(struct spi_imx_data));
	if (!master)
		return -ENOMEM;

	platform_set_drvdata(pdev, master);

	master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
	master->bus_num = np ? -1 : pdev->id;

	spi_imx = spi_master_get_devdata(master);
	spi_imx->bitbang.master = master;
	spi_imx->dev = &pdev->dev;

	spi_imx->devtype_data = of_id ? of_id->data :
		(struct spi_imx_devtype_data *)pdev->id_entry->driver_data;

	if (mxc_platform_info) {
		master->num_chipselect = mxc_platform_info->num_chipselect;
		master->cs_gpios = devm_kzalloc(&master->dev,
			sizeof(int) * master->num_chipselect, GFP_KERNEL);
		if (!master->cs_gpios)
			return -ENOMEM;

		for (i = 0; i < master->num_chipselect; i++)
			master->cs_gpios[i] = mxc_platform_info->chipselect[i];
 	}

	spi_imx->bitbang.chipselect = spi_imx_chipselect;
	spi_imx->bitbang.setup_transfer = spi_imx_setupxfer;
	spi_imx->bitbang.txrx_bufs = spi_imx_transfer;
	spi_imx->bitbang.master->setup = spi_imx_setup;
	spi_imx->bitbang.master->cleanup = spi_imx_cleanup;
	spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message;
	spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message;
	spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
	if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx))
		spi_imx->bitbang.master->mode_bits |= SPI_LOOP;

	init_completion(&spi_imx->xfer_done);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	spi_imx->base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(spi_imx->base)) {
		ret = PTR_ERR(spi_imx->base);
		goto out_master_put;
	}
	spi_imx->base_phys = res->start;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		ret = irq;
		goto out_master_put;
	}

	ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0,
			       dev_name(&pdev->dev), spi_imx);
	if (ret) {
		dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret);
		goto out_master_put;
	}

	spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
	if (IS_ERR(spi_imx->clk_ipg)) {
		ret = PTR_ERR(spi_imx->clk_ipg);
		goto out_master_put;
	}

	spi_imx->clk_per = devm_clk_get(&pdev->dev, "per");
	if (IS_ERR(spi_imx->clk_per)) {
		ret = PTR_ERR(spi_imx->clk_per);
		goto out_master_put;
	}

	ret = clk_prepare_enable(spi_imx->clk_per);
	if (ret)
		goto out_master_put;

	ret = clk_prepare_enable(spi_imx->clk_ipg);
	if (ret)
		goto out_put_per;

	spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
	/*
         * Only validated on i.mx35 and i.mx6 now, can remove the constraint
         * if validated on other chips.
         */
	if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx)) {
		ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master);
		if (ret == -EPROBE_DEFER)
			goto out_clk_put;

		if (ret < 0)
			dev_err(&pdev->dev, "dma setup error %d, use pio\n",
				ret);
	}

	spi_imx->devtype_data->reset(spi_imx);

	spi_imx->devtype_data->intctrl(spi_imx, 0);

	master->dev.of_node = pdev->dev.of_node;
	ret = spi_bitbang_start(&spi_imx->bitbang);
	if (ret) {
		dev_err(&pdev->dev, "bitbang start failed with %d\n", ret);
		goto out_clk_put;
	}

	if (!master->cs_gpios) {
		dev_err(&pdev->dev, "No CS GPIOs available\n");
		ret = -EINVAL;
		goto out_clk_put;
	}

	for (i = 0; i < master->num_chipselect; i++) {
		if (!gpio_is_valid(master->cs_gpios[i]))
			continue;

		ret = devm_gpio_request(&pdev->dev, master->cs_gpios[i],
					DRIVER_NAME);
		if (ret) {
			dev_err(&pdev->dev, "Can't get CS GPIO %i\n",
				master->cs_gpios[i]);
			goto out_clk_put;
		}
	}

	dev_info(&pdev->dev, "probed\n");

	clk_disable(spi_imx->clk_ipg);
	clk_disable(spi_imx->clk_per);
	return ret;

out_clk_put:
	clk_disable_unprepare(spi_imx->clk_ipg);
out_put_per:
	clk_disable_unprepare(spi_imx->clk_per);
out_master_put:
	spi_master_put(master);

	return ret;
}

Contributors
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Tokens
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CommitProp
Sascha Hauer
429
47.30%
4
12.50%
Alexander Shiyan
138
15.21%
2
6.25%
Anton Bondarenko
72
7.94%
5
15.62%
Shawn Guo
54
5.95%
3
9.38%
Uwe Kleine-König
52
5.73%
4
12.50%
Fabio Estevam
48
5.29%
5
15.62%
Huang Shijie
34
3.75%
1
3.12%
Robin Gong
24
2.65%
1
3.12%
Marek Vašut
22
2.43%
1
3.12%
Martin Kaiser
11
1.21%
2
6.25%
Stephen Warren
11
1.21%
1
3.12%
Daniel Mack
6
0.66%
1
3.12%
Wei Yongjun
5
0.55%
1
3.12%
Richard Genoud
1
0.11%
1
3.12%
Total
907
100.00%
32
100.00%



static int spi_imx_remove(struct platform_device *pdev)
{
	struct spi_master *master = platform_get_drvdata(pdev);
	struct spi_imx_data *spi_imx = spi_master_get_devdata(master);

	spi_bitbang_stop(&spi_imx->bitbang);

	writel(0, spi_imx->base + MXC_CSPICTRL);
	clk_unprepare(spi_imx->clk_ipg);
	clk_unprepare(spi_imx->clk_per);
	spi_imx_sdma_exit(spi_imx);
	spi_master_put(master);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
61
79.22%
1
20.00%
Uwe Kleine-König
7
9.09%
1
20.00%
Robin Gong
5
6.49%
1
20.00%
Fabio Estevam
2
2.60%
1
20.00%
Philippe De Muyter
2
2.60%
1
20.00%
Total
77
100.00%
5
100.00%


static struct platform_driver spi_imx_driver = {
	.driver = {
		   .name = DRIVER_NAME,
		   .of_match_table = spi_imx_dt_ids,
                   },
	.id_table = spi_imx_devtype,
	.probe = spi_imx_probe,
	.remove = spi_imx_remove,
};

module_platform_driver(spi_imx_driver);

MODULE_DESCRIPTION("SPI Master Controller driver");
MODULE_AUTHOR("Sascha Hauer, Pengutronix");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRIVER_NAME);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Sascha Hauer
2055
34.47%
15
19.48%
Uwe Kleine-König
941
15.78%
8
10.39%
Robin Gong
806
13.52%
2
2.60%
Shawn Guo
578
9.69%
7
9.09%
Anton Bondarenko
571
9.58%
10
12.99%
Alexander Shiyan
252
4.23%
3
3.90%
Martin Kaiser
151
2.53%
3
3.90%
Huang Shijie
150
2.52%
1
1.30%
Fabio Estevam
105
1.76%
6
7.79%
Marek Vašut
92
1.54%
2
2.60%
Knut Wohlrab
65
1.09%
2
2.60%
Christian Gmeiner
54
0.91%
1
1.30%
Jiada Wang
38
0.64%
1
1.30%
Robert Baldyga
29
0.49%
1
1.30%
David Jander
13
0.22%
1
1.30%
Stephen Warren
11
0.18%
1
1.30%
Nicholas Mc Guire
8
0.13%
1
1.30%
Niels de Vos
7
0.12%
1
1.30%
Jason (Hui) Wang
7
0.12%
1
1.30%
Daniel Mack
6
0.10%
1
1.30%
Wei Yongjun
5
0.08%
1
1.30%
Alberto Panizzo
4
0.07%
1
1.30%
Sachin Kamat
4
0.07%
1
1.30%
Tejun Heo
3
0.05%
1
1.30%
Grant C. Likely
2
0.03%
1
1.30%
Philippe De Muyter
2
0.03%
1
1.30%
Krzysztof Kozlowski
1
0.02%
1
1.30%
Arnd Bergmann
1
0.02%
1
1.30%
Richard Genoud
1
0.02%
1
1.30%
Total
5962
100.00%
77
100.00%
Directory: drivers/spi

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