Release 4.7 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;
	
unsigned int mode;
	
u8 cs;
};


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_imx_data *, 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;
	
int chipselect[0];
};



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)
{
	int i;

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

	return max;
}

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


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

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

	return 7;
}

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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;

	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;

	if (transfer->len < spi_imx->wml * bpw)
		return false;

	if (transfer->len % (spi_imx->wml * bpw))
		return false;

	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 __maybe_unused 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 __maybe_unused 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 __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
		struct spi_imx_config *config)
{
	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(config->cs);

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

	cfg |= MX51_ECSPI_CONFIG_SBBCTRL(config->cs);

	if (config->mode & SPI_CPHA)
		cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs);
	else
		cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(config->cs);

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

	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 (config->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 __maybe_unused 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 __maybe_unused 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_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_CSPISTATUS		0x14

#define MX31_STATUS_RR		(1 << 3)

/* 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 __maybe_unused 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 __maybe_unused 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 __maybe_unused mx31_config(struct spi_imx_data *spi_imx,
		struct spi_imx_config *config)
{
	unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER;
	int cs = spi_imx->chipselect[config->cs];

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

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

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

	return 0;
}

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shawn guo
23
13.77%
2
28.57%
Total
167
100.00%
7
100.00%



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

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sascha hauer
20
83.33%
1
33.33%
uwe kleine-koenig
uwe kleine-koenig
4
16.67%
2
66.67%
Total
24
100.00%
3
100.00%



static void __maybe_unused 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);
}

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uwe kleine-koenig
32
91.43%
1
50.00%
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shawn guo
3
8.57%
1
50.00%
Total
35
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 __maybe_unused 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);
}

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sascha hauer
45
86.54%
1
25.00%
uwe kleine-koenig
uwe kleine-koenig
4
7.69%
2
50.00%
shawn guo
shawn guo
3
5.77%
1
25.00%
Total
52
100.00%
4
100.00%



static void __maybe_unused 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);
}

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sascha hauer
35
83.33%
1
25.00%
uwe kleine-koenig
uwe kleine-koenig
5
11.90%
2
50.00%
shawn guo
shawn guo
2
4.76%
1
25.00%
Total
42
100.00%
4
100.00%



static int __maybe_unused mx21_config(struct spi_imx_data *spi_imx,
		struct spi_imx_config *config)
{
	unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
	int cs = spi_imx->chipselect[config->cs];
	unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;

	reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max) <<
		MX21_CSPICTRL_DR_SHIFT;
	reg |= config->bpw - 1;

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

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

	return 0;
}

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sascha hauer
99
70.21%
1
16.67%
shawn guo
shawn guo
23
16.31%
2
33.33%
uwe kleine-koenig
uwe kleine-koenig
19
13.48%
3
50.00%
Total
141
100.00%
6
100.00%



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

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sascha hauer
18
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1
25.00%
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uwe kleine-koenig
4
16.67%
2
50.00%
shawn guo
shawn guo
2
8.33%
1
25.00%
Total
24
100.00%
4
100.00%



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

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uwe kleine-koenig
22
95.65%
1
50.00%
shawn guo
shawn guo
1
4.35%
1
50.00%
Total
23
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 __maybe_unused 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);
}

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sascha hauer
48
92.31%
1
33.33%
uwe kleine-koenig
uwe kleine-koenig
4
7.69%
2
66.67%
Total
52
100.00%
3
100.00%



static void __maybe_unused 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);
}

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sascha hauer
37
88.10%
1
33.33%
uwe kleine-koenig
uwe kleine-koenig
5
11.90%
2
66.67%
Total
42
100.00%
3
100.00%



static int __maybe_unused mx1_config(struct spi_imx_data *spi_imx,
		struct spi_imx_config *config)
{
	unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER;

	reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) <<
		MX1_CSPICTRL_DR_SHIFT;
	reg |= config->bpw - 1;

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

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

	return 0;
}

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sascha hauer
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91.86%
1
33.33%
uwe kleine-koenig
uwe kleine-koenig
7
8.14%
2
66.67%
Total
86
100.00%
3
100.00%



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

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sascha hauer
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1
33.33%
uwe kleine-koenig
uwe kleine-koenig
4
16.67%
2
66.67%
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24
100.00%
3
100.00%



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

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23
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1
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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)
{
	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
	int gpio = spi_imx->chipselect[spi->chip_select];
	int active = is_active != BITBANG_CS_INACTIVE;
	int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH);

	if (!gpio_is_valid(gpio))
		return;

	gpio_set_value(gpio, dev_is_lowactive ^ active);
}

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51
68.00%
1
25.00%
uwe kleine-koenig
uwe kleine-koenig
20
26.67%
2
50.00%
jason wang
jason wang
4
5.33%
1
25.00%
Total
75
100.00%
4
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);
}

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sascha hauer
37
69.81%
1
16.67%
uwe kleine-koenig
uwe kleine-koenig
11
20.75%
2
33.33%
shawn guo
shawn guo
4
7.55%
2
33.33%
david jander
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;
}

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sascha hauer
83
78.30%
1
25.00%
uwe kleine-koenig
uwe kleine-koenig
20
18.87%
2
50.00%
shawn guo
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);

	if (bytes_per_word == spi_imx->bytes_per_word)
		/* Same as last time */
		return 0;

	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;
}

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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;
	config.mode = spi->mode;
	config.cs = spi->chip_select;

	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_imx, &config);

	return 0;
}

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uwe kleine-koenig
74
30.33%
4
40.00%
anton bondarenko
anton bondarenko
34
13.93%
1
10.00%
sachin kamat
sachin kamat
3
1.23%
1
10.00%
shawn guo
shawn guo
1
0.41%
1
10.00%
Total
244
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;
	}
}

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24
37.50%
1
25.00%
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shawn guo
1
1.56%
1
25.00%
sachin kamat
sachin kamat
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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54
26.21%
3
42.86%
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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
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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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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
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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;
}

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robin gong
robin gong
219
68.65%
1
14.29%
sascha hauer
sascha hauer
68
21.32%
3
42.86%
anton bondarenko
anton bondarenko
24
7.52%
2
28.57%
nicholas mc guire
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);

	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);

	wait_for_completion(&spi_imx->xfer_done);

	return transfer->len;
}

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robin gong
robin gong
95
100.00%
1
100.00%
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95
100.00%
1
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);
}

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robin gong
robin gong
48
94.12%
1
33.33%
sascha hauer
sascha hauer
3
5.88%
2
66.67%
Total
51
100.00%
3
100.00%



static int spi_imx_setup(struct spi_device *spi)
{
	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
	int gpio = spi_imx->chipselect[spi->chip_select];

	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(gpio))
		gpio_direction_output(gpio, spi->mode & SPI_CS_HIGH ? 0 : 1);

	spi_imx_chipselect(spi, BITBANG_CS_INACTIVE);

	return 0;
}

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sascha hauer
sascha hauer
46
50.55%
2
33.33%
robin gong
robin gong
37
40.66%
1
16.67%
alberto panizzo
alberto panizzo
4
4.40%
1
16.67%
jason wang
jason wang
3
3.30%
1
16.67%
uwe kleine-koenig
uwe kleine-koenig
1
1.10%
1
16.67%
Total
91
100.00%
6
100.00%



static void spi_imx_cleanup(struct spi_device *spi)
{
}

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sascha hauer
9
90.00%
1
50.00%
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uwe kleine-koenig
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;
}

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huang shijie
73
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1
100.00%
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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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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, num_cs, irq;

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

	ret = of_property_read_u32(np, "fsl,spi-num-chipselects", &num_cs);
	if (ret < 0) {
		if (mxc_platform_info)
			num_cs = mxc_platform_info->num_chipselect;
		else
			return ret;
	}

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

	platform_set_drvdata(pdev, master);

	master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
	master->bus_num = pdev->id;
	master->num_chipselect = num_cs;

	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;

	for (i = 0; i < master->num_chipselect; i++) {
		int cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
		if (!gpio_is_valid(cs_gpio) && mxc_platform_info)
			cs_gpio = mxc_platform_info->chipselect[i];

		spi_imx->chipselect[i] = cs_gpio;
		if (!gpio_is_valid(cs_gpio))
			continue;

		ret = devm_gpio_request(&pdev->dev, spi_imx->chipselect[i],
					DRIVER_NAME);
		if (ret) {
			dev_err(&pdev->dev, "can't get cs gpios\n");
			goto out_master_put;
		}
	}

	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_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.mx6 now, can remove the constrain if validated on
         * other chips.
         */
	if (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;
	}

	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;
}

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sascha hauer
sascha hauer
459
53.06%
4
12.90%
shawn guo
shawn guo
114
13.18%
3
9.68%
anton bondarenko
anton bondarenko
72
8.32%
5
16.13%
fabio estevam
fabio estevam
61
7.05%
6
19.35%
uwe kleine-koenig
uwe kleine-koenig
54
6.24%
4
12.90%
huang shijie
huang shijie
34
3.93%
1
3.23%
robin gong
robin gong
25
2.89%
1
3.23%
lothar wassmann
lothar wassmann
12
1.39%
1
3.23%
stephen warren
stephen warren
11
1.27%
1
3.23%
jason wang
jason wang
8
0.92%
1
3.23%
alexander shiyan
alexander shiyan
7
0.81%
1
3.23%
daniel mack
daniel mack
6
0.69%
1
3.23%
richard genoud
richard genoud
1
0.12%
1
3.23%
john ogness
john ogness
1
0.12%
1
3.23%
Total
865
100.00%
31
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;
}

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sascha hauer
sascha hauer
61
79.22%
1
20.00%
uwe kleine-koenig
uwe kleine-koenig
7
9.09%
1
20.00%
robin gong
robin gong
5
6.49%
1
20.00%
philippe de muyter
philippe de muyter
2
2.60%
1
20.00%
fabio estevam
fabio estevam
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);
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sascha hauer
sascha hauer
2136
37.13%
15
20.83%
uwe kleine-koenig
uwe kleine-koenig
1027
17.85%
10
13.89%
robin gong
robin gong
838
14.57%
2
2.78%
shawn guo
shawn guo
644
11.19%
7
9.72%
anton bondarenko
anton bondarenko
596
10.36%
10
13.89%
huang shijie
huang shijie
150
2.61%
1
1.39%
fabio estevam
fabio estevam
119
2.07%
7
9.72%
knut wohlrab
knut wohlrab
75
1.30%
2
2.78%
marek vasut
marek vasut
70
1.22%
1
1.39%
jason wang
jason wang
15
0.26%
1
1.39%
david jander
david jander
13
0.23%
1
1.39%
lothar wassmann
lothar wassmann
12
0.21%
1
1.39%
stephen warren
stephen warren
11
0.19%
1
1.39%
nicholas mc guire
nicholas mc guire
8
0.14%
1
1.39%
alexander shiyan
alexander shiyan
7
0.12%
1
1.39%
niels de vos
niels de vos
7
0.12%
1
1.39%
daniel mack
daniel mack
6
0.10%
1
1.39%
alberto panizzo
alberto panizzo
4
0.07%
1
1.39%
sachin kamat
sachin kamat
4
0.07%
1
1.39%
tejun heo
tejun heo
3
0.05%
1
1.39%
philippe de muyter
philippe de muyter
2
0.03%
1
1.39%
grant likely
grant likely
2
0.03%
1
1.39%
krzysztof kozlowski
krzysztof kozlowski
1
0.02%
1
1.39%
richard genoud
richard genoud
1
0.02%
1
1.39%
arnd bergmann
arnd bergmann
1
0.02%
1
1.39%
john ogness
john ogness
1
0.02%
1
1.39%
Total
5753
100.00%
72
100.00%
  
Directory: drivers/spi

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