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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/spi/spi-imx.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/spi/spi-imx.c')
-rw-r--r--drivers/spi/spi-imx.c1960
1 files changed, 1960 insertions, 0 deletions
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
new file mode 100644
index 000000000..2c660a95c
--- /dev/null
+++ b/drivers/spi/spi-imx.c
@@ -0,0 +1,1960 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+// Copyright (C) 2008 Juergen Beisert
+
+#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/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+#include <linux/types.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/property.h>
+
+#include <linux/dma/imx-dma.h>
+
+#define DRIVER_NAME "spi_imx"
+
+static bool use_dma = true;
+module_param(use_dma, bool, 0644);
+MODULE_PARM_DESC(use_dma, "Enable usage of DMA when available (default)");
+
+/* define polling limits */
+static unsigned int polling_limit_us = 30;
+module_param(polling_limit_us, uint, 0664);
+MODULE_PARM_DESC(polling_limit_us,
+ "time in us to run a transfer in polling mode\n");
+
+#define MXC_RPM_TIMEOUT 2000 /* 2000ms */
+
+#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 */
+#define MXC_INT_RDR BIT(4) /* Receive date threshold interrupt */
+
+/* The maximum bytes that a sdma BD can transfer. */
+#define MAX_SDMA_BD_BYTES (1 << 15)
+#define MX51_ECSPI_CTRL_MAX_BURST 512
+/* The maximum bytes that IMX53_ECSPI can transfer in slave mode.*/
+#define MX53_MAX_TRANSFER_BYTES 512
+
+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 */
+ IMX53_ECSPI, /* ECSPI on i.mx53 and later */
+};
+
+struct spi_imx_data;
+
+struct spi_imx_devtype_data {
+ void (*intctrl)(struct spi_imx_data *spi_imx, int enable);
+ int (*prepare_message)(struct spi_imx_data *spi_imx, struct spi_message *msg);
+ int (*prepare_transfer)(struct spi_imx_data *spi_imx, struct spi_device *spi);
+ void (*trigger)(struct spi_imx_data *spi_imx);
+ int (*rx_available)(struct spi_imx_data *spi_imx);
+ void (*reset)(struct spi_imx_data *spi_imx);
+ void (*setup_wml)(struct spi_imx_data *spi_imx);
+ void (*disable)(struct spi_imx_data *spi_imx);
+ void (*disable_dma)(struct spi_imx_data *spi_imx);
+ bool has_dmamode;
+ bool has_slavemode;
+ unsigned int fifo_size;
+ bool dynamic_burst;
+ /*
+ * ERR009165 fixed or not:
+ * https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf
+ */
+ bool tx_glitch_fixed;
+ enum spi_imx_devtype devtype;
+};
+
+struct spi_imx_data {
+ struct spi_controller *controller;
+ 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 bits_per_word;
+ unsigned int spi_drctl;
+
+ unsigned int count, remainder;
+ void (*tx)(struct spi_imx_data *spi_imx);
+ void (*rx)(struct spi_imx_data *spi_imx);
+ void *rx_buf;
+ const void *tx_buf;
+ unsigned int txfifo; /* number of words pushed in tx FIFO */
+ unsigned int dynamic_burst;
+ bool rx_only;
+
+ /* Slave mode */
+ bool slave_mode;
+ bool slave_aborted;
+ unsigned int slave_burst;
+
+ /* 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;
+}
+
+static inline int is_imx35_cspi(struct spi_imx_data *d)
+{
+ return d->devtype_data->devtype == IMX35_CSPI;
+}
+
+static inline int is_imx51_ecspi(struct spi_imx_data *d)
+{
+ return d->devtype_data->devtype == IMX51_ECSPI;
+}
+
+static inline int is_imx53_ecspi(struct spi_imx_data *d)
+{
+ return d->devtype_data->devtype == IMX53_ECSPI;
+}
+
+#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); \
+ } \
+ \
+ spi_imx->remainder -= 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;
+}
+
+/* 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;
+}
+
+static int spi_imx_bytes_per_word(const int bits_per_word)
+{
+ if (bits_per_word <= 8)
+ return 1;
+ else if (bits_per_word <= 16)
+ return 2;
+ else
+ return 4;
+}
+
+static bool spi_imx_can_dma(struct spi_controller *controller, struct spi_device *spi,
+ struct spi_transfer *transfer)
+{
+ struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
+
+ if (!use_dma || controller->fallback)
+ return false;
+
+ if (!controller->dma_rx)
+ return false;
+
+ if (spi_imx->slave_mode)
+ return false;
+
+ if (transfer->len < spi_imx->devtype_data->fifo_size)
+ return false;
+
+ spi_imx->dynamic_burst = 0;
+
+ return true;
+}
+
+/*
+ * Note the number of natively supported chip selects for MX51 is 4. Some
+ * devices may have less actual SS pins but the register map supports 4. When
+ * using gpio chip selects the cs values passed into the macros below can go
+ * outside the range 0 - 3. We therefore need to limit the cs value to avoid
+ * corrupting bits outside the allocated locations.
+ *
+ * The simplest way to do this is to just mask the cs bits to 2 bits. This
+ * still allows all 4 native chip selects to work as well as gpio chip selects
+ * (which can use any of the 4 chip select configurations).
+ */
+
+#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_DRCTL(drctl) ((drctl) << 16)
+#define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8
+#define MX51_ECSPI_CTRL_PREDIV_OFFSET 12
+#define MX51_ECSPI_CTRL_CS(cs) ((cs & 3) << 18)
+#define MX51_ECSPI_CTRL_BL_OFFSET 20
+#define MX51_ECSPI_CTRL_BL_MASK (0xfff << 20)
+
+#define MX51_ECSPI_CONFIG 0x0c
+#define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs & 3) + 0))
+#define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs & 3) + 4))
+#define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs & 3) + 8))
+#define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs & 3) + 12))
+#define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs & 3) + 20))
+
+#define MX51_ECSPI_INT 0x10
+#define MX51_ECSPI_INT_TEEN (1 << 0)
+#define MX51_ECSPI_INT_RREN (1 << 3)
+#define MX51_ECSPI_INT_RDREN (1 << 4)
+
+#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)
+
+static void spi_imx_buf_rx_swap_u32(struct spi_imx_data *spi_imx)
+{
+ unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA);
+
+ if (spi_imx->rx_buf) {
+#ifdef __LITTLE_ENDIAN
+ unsigned int bytes_per_word;
+
+ bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
+ if (bytes_per_word == 1)
+ swab32s(&val);
+ else if (bytes_per_word == 2)
+ swahw32s(&val);
+#endif
+ *(u32 *)spi_imx->rx_buf = val;
+ spi_imx->rx_buf += sizeof(u32);
+ }
+
+ spi_imx->remainder -= sizeof(u32);
+}
+
+static void spi_imx_buf_rx_swap(struct spi_imx_data *spi_imx)
+{
+ int unaligned;
+ u32 val;
+
+ unaligned = spi_imx->remainder % 4;
+
+ if (!unaligned) {
+ spi_imx_buf_rx_swap_u32(spi_imx);
+ return;
+ }
+
+ if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) {
+ spi_imx_buf_rx_u16(spi_imx);
+ return;
+ }
+
+ val = readl(spi_imx->base + MXC_CSPIRXDATA);
+
+ while (unaligned--) {
+ if (spi_imx->rx_buf) {
+ *(u8 *)spi_imx->rx_buf = (val >> (8 * unaligned)) & 0xff;
+ spi_imx->rx_buf++;
+ }
+ spi_imx->remainder--;
+ }
+}
+
+static void spi_imx_buf_tx_swap_u32(struct spi_imx_data *spi_imx)
+{
+ u32 val = 0;
+#ifdef __LITTLE_ENDIAN
+ unsigned int bytes_per_word;
+#endif
+
+ if (spi_imx->tx_buf) {
+ val = *(u32 *)spi_imx->tx_buf;
+ spi_imx->tx_buf += sizeof(u32);
+ }
+
+ spi_imx->count -= sizeof(u32);
+#ifdef __LITTLE_ENDIAN
+ bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word);
+
+ if (bytes_per_word == 1)
+ swab32s(&val);
+ else if (bytes_per_word == 2)
+ swahw32s(&val);
+#endif
+ writel(val, spi_imx->base + MXC_CSPITXDATA);
+}
+
+static void spi_imx_buf_tx_swap(struct spi_imx_data *spi_imx)
+{
+ int unaligned;
+ u32 val = 0;
+
+ unaligned = spi_imx->count % 4;
+
+ if (!unaligned) {
+ spi_imx_buf_tx_swap_u32(spi_imx);
+ return;
+ }
+
+ if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) {
+ spi_imx_buf_tx_u16(spi_imx);
+ return;
+ }
+
+ while (unaligned--) {
+ if (spi_imx->tx_buf) {
+ val |= *(u8 *)spi_imx->tx_buf << (8 * unaligned);
+ spi_imx->tx_buf++;
+ }
+ spi_imx->count--;
+ }
+
+ writel(val, spi_imx->base + MXC_CSPITXDATA);
+}
+
+static void mx53_ecspi_rx_slave(struct spi_imx_data *spi_imx)
+{
+ u32 val = be32_to_cpu(readl(spi_imx->base + MXC_CSPIRXDATA));
+
+ if (spi_imx->rx_buf) {
+ int n_bytes = spi_imx->slave_burst % sizeof(val);
+
+ if (!n_bytes)
+ n_bytes = sizeof(val);
+
+ memcpy(spi_imx->rx_buf,
+ ((u8 *)&val) + sizeof(val) - n_bytes, n_bytes);
+
+ spi_imx->rx_buf += n_bytes;
+ spi_imx->slave_burst -= n_bytes;
+ }
+
+ spi_imx->remainder -= sizeof(u32);
+}
+
+static void mx53_ecspi_tx_slave(struct spi_imx_data *spi_imx)
+{
+ u32 val = 0;
+ int n_bytes = spi_imx->count % sizeof(val);
+
+ if (!n_bytes)
+ n_bytes = sizeof(val);
+
+ if (spi_imx->tx_buf) {
+ memcpy(((u8 *)&val) + sizeof(val) - n_bytes,
+ spi_imx->tx_buf, n_bytes);
+ val = cpu_to_be32(val);
+ spi_imx->tx_buf += n_bytes;
+ }
+
+ spi_imx->count -= n_bytes;
+
+ writel(val, spi_imx->base + MXC_CSPITXDATA);
+}
+
+/* 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;
+
+ fspi = min(fspi, fin);
+
+ 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);
+}
+
+static void mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable)
+{
+ unsigned int val = 0;
+
+ if (enable & MXC_INT_TE)
+ val |= MX51_ECSPI_INT_TEEN;
+
+ if (enable & MXC_INT_RR)
+ val |= MX51_ECSPI_INT_RREN;
+
+ if (enable & MXC_INT_RDR)
+ val |= MX51_ECSPI_INT_RDREN;
+
+ writel(val, spi_imx->base + MX51_ECSPI_INT);
+}
+
+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);
+}
+
+static void mx51_disable_dma(struct spi_imx_data *spi_imx)
+{
+ writel(0, spi_imx->base + MX51_ECSPI_DMA);
+}
+
+static void mx51_ecspi_disable(struct spi_imx_data *spi_imx)
+{
+ u32 ctrl;
+
+ ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
+ ctrl &= ~MX51_ECSPI_CTRL_ENABLE;
+ writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
+}
+
+static int mx51_ecspi_prepare_message(struct spi_imx_data *spi_imx,
+ struct spi_message *msg)
+{
+ struct spi_device *spi = msg->spi;
+ struct spi_transfer *xfer;
+ u32 ctrl = MX51_ECSPI_CTRL_ENABLE;
+ u32 min_speed_hz = ~0U;
+ u32 testreg, delay;
+ u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
+ u32 current_cfg = cfg;
+
+ /* set Master or Slave mode */
+ if (spi_imx->slave_mode)
+ ctrl &= ~MX51_ECSPI_CTRL_MODE_MASK;
+ else
+ ctrl |= MX51_ECSPI_CTRL_MODE_MASK;
+
+ /*
+ * Enable SPI_RDY handling (falling edge/level triggered).
+ */
+ if (spi->mode & SPI_READY)
+ ctrl |= MX51_ECSPI_CTRL_DRCTL(spi_imx->spi_drctl);
+
+ /* set chip select to use */
+ ctrl |= MX51_ECSPI_CTRL_CS(spi->chip_select);
+
+ /*
+ * The ctrl register must be written first, with the EN bit set other
+ * registers must not be written to.
+ */
+ writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
+
+ testreg = readl(spi_imx->base + MX51_ECSPI_TESTREG);
+ if (spi->mode & SPI_LOOP)
+ testreg |= MX51_ECSPI_TESTREG_LBC;
+ else
+ testreg &= ~MX51_ECSPI_TESTREG_LBC;
+ writel(testreg, spi_imx->base + MX51_ECSPI_TESTREG);
+
+ /*
+ * eCSPI burst completion by Chip Select signal in Slave mode
+ * is not functional for imx53 Soc, config SPI burst completed when
+ * BURST_LENGTH + 1 bits are received
+ */
+ if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx))
+ cfg &= ~MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select);
+ else
+ cfg |= MX51_ECSPI_CONFIG_SBBCTRL(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 (cfg == current_cfg)
+ return 0;
+
+ 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.
+ *
+ * Because spi_imx->spi_bus_clk is only set in prepare_message
+ * callback, iterate over all the transfers in spi_message, find the
+ * one with lowest bus frequency, and use that bus frequency for the
+ * delay calculation. In case all transfers have speed_hz == 0, then
+ * min_speed_hz is ~0 and the resulting delay is zero.
+ */
+ list_for_each_entry(xfer, &msg->transfers, transfer_list) {
+ if (!xfer->speed_hz)
+ continue;
+ min_speed_hz = min(xfer->speed_hz, min_speed_hz);
+ }
+
+ delay = (2 * 1000000) / min_speed_hz;
+ if (likely(delay < 10)) /* SCLK is faster than 200 kHz */
+ udelay(delay);
+ else /* SCLK is _very_ slow */
+ usleep_range(delay, delay + 10);
+
+ return 0;
+}
+
+static void mx51_configure_cpha(struct spi_imx_data *spi_imx,
+ struct spi_device *spi)
+{
+ bool cpha = (spi->mode & SPI_CPHA);
+ bool flip_cpha = (spi->mode & SPI_RX_CPHA_FLIP) && spi_imx->rx_only;
+ u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
+
+ /* Flip cpha logical value iff flip_cpha */
+ cpha ^= flip_cpha;
+
+ if (cpha)
+ cfg |= MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
+ else
+ cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
+
+ writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
+}
+
+static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
+ struct spi_device *spi)
+{
+ u32 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
+ u32 clk;
+
+ /* Clear BL field and set the right value */
+ ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
+ if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx))
+ ctrl |= (spi_imx->slave_burst * 8 - 1)
+ << MX51_ECSPI_CTRL_BL_OFFSET;
+ else
+ ctrl |= (spi_imx->bits_per_word - 1)
+ << MX51_ECSPI_CTRL_BL_OFFSET;
+
+ /* set clock speed */
+ ctrl &= ~(0xf << MX51_ECSPI_CTRL_POSTDIV_OFFSET |
+ 0xf << MX51_ECSPI_CTRL_PREDIV_OFFSET);
+ ctrl |= mx51_ecspi_clkdiv(spi_imx, spi_imx->spi_bus_clk, &clk);
+ spi_imx->spi_bus_clk = clk;
+
+ mx51_configure_cpha(spi_imx, spi);
+
+ /*
+ * ERR009165: work in XHC mode instead of SMC as PIO on the chips
+ * before i.mx6ul.
+ */
+ if (spi_imx->usedma && spi_imx->devtype_data->tx_glitch_fixed)
+ ctrl |= MX51_ECSPI_CTRL_SMC;
+ else
+ ctrl &= ~MX51_ECSPI_CTRL_SMC;
+
+ writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
+
+ return 0;
+}
+
+static void mx51_setup_wml(struct spi_imx_data *spi_imx)
+{
+ u32 tx_wml = 0;
+
+ if (spi_imx->devtype_data->tx_glitch_fixed)
+ tx_wml = spi_imx->wml;
+ /*
+ * Configure the DMA register: setup the watermark
+ * and enable DMA request.
+ */
+ writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml - 1) |
+ MX51_ECSPI_DMA_TX_WML(tx_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);
+}
+
+static int mx51_ecspi_rx_available(struct spi_imx_data *spi_imx)
+{
+ return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR;
+}
+
+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);
+}
+
+#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);
+}
+
+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);
+}
+
+static int mx31_prepare_message(struct spi_imx_data *spi_imx,
+ struct spi_message *msg)
+{
+ return 0;
+}
+
+static int mx31_prepare_transfer(struct spi_imx_data *spi_imx,
+ struct spi_device *spi)
+{
+ unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER;
+ unsigned int clk;
+
+ reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, spi_imx->spi_bus_clk, &clk) <<
+ MX31_CSPICTRL_DR_SHIFT;
+ spi_imx->spi_bus_clk = clk;
+
+ if (is_imx35_cspi(spi_imx)) {
+ reg |= (spi_imx->bits_per_word - 1) << MX35_CSPICTRL_BL_SHIFT;
+ reg |= MX31_CSPICTRL_SSCTL;
+ } else {
+ reg |= (spi_imx->bits_per_word - 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_gpiod)
+ reg |= (spi->chip_select) <<
+ (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;
+}
+
+static int mx31_rx_available(struct spi_imx_data *spi_imx)
+{
+ return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR;
+}
+
+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);
+}
+
+#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);
+}
+
+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);
+}
+
+static int mx21_prepare_message(struct spi_imx_data *spi_imx,
+ struct spi_message *msg)
+{
+ return 0;
+}
+
+static int mx21_prepare_transfer(struct spi_imx_data *spi_imx,
+ struct spi_device *spi)
+{
+ 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, spi_imx->spi_bus_clk, max, &clk)
+ << MX21_CSPICTRL_DR_SHIFT;
+ spi_imx->spi_bus_clk = clk;
+
+ reg |= spi_imx->bits_per_word - 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_gpiod)
+ reg |= spi->chip_select << MX21_CSPICTRL_CS_SHIFT;
+
+ writel(reg, spi_imx->base + MXC_CSPICTRL);
+
+ return 0;
+}
+
+static int mx21_rx_available(struct spi_imx_data *spi_imx)
+{
+ return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR;
+}
+
+static void mx21_reset(struct spi_imx_data *spi_imx)
+{
+ writel(1, spi_imx->base + MXC_RESET);
+}
+
+#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);
+}
+
+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);
+}
+
+static int mx1_prepare_message(struct spi_imx_data *spi_imx,
+ struct spi_message *msg)
+{
+ return 0;
+}
+
+static int mx1_prepare_transfer(struct spi_imx_data *spi_imx,
+ struct spi_device *spi)
+{
+ unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER;
+ unsigned int clk;
+
+ reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, spi_imx->spi_bus_clk, &clk) <<
+ MX1_CSPICTRL_DR_SHIFT;
+ spi_imx->spi_bus_clk = clk;
+
+ reg |= spi_imx->bits_per_word - 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;
+}
+
+static int mx1_rx_available(struct spi_imx_data *spi_imx)
+{
+ return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR;
+}
+
+static void mx1_reset(struct spi_imx_data *spi_imx)
+{
+ writel(1, spi_imx->base + MXC_RESET);
+}
+
+static struct spi_imx_devtype_data imx1_cspi_devtype_data = {
+ .intctrl = mx1_intctrl,
+ .prepare_message = mx1_prepare_message,
+ .prepare_transfer = mx1_prepare_transfer,
+ .trigger = mx1_trigger,
+ .rx_available = mx1_rx_available,
+ .reset = mx1_reset,
+ .fifo_size = 8,
+ .has_dmamode = false,
+ .dynamic_burst = false,
+ .has_slavemode = false,
+ .devtype = IMX1_CSPI,
+};
+
+static struct spi_imx_devtype_data imx21_cspi_devtype_data = {
+ .intctrl = mx21_intctrl,
+ .prepare_message = mx21_prepare_message,
+ .prepare_transfer = mx21_prepare_transfer,
+ .trigger = mx21_trigger,
+ .rx_available = mx21_rx_available,
+ .reset = mx21_reset,
+ .fifo_size = 8,
+ .has_dmamode = false,
+ .dynamic_burst = false,
+ .has_slavemode = false,
+ .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,
+ .prepare_message = mx21_prepare_message,
+ .prepare_transfer = mx21_prepare_transfer,
+ .trigger = mx21_trigger,
+ .rx_available = mx21_rx_available,
+ .reset = mx21_reset,
+ .fifo_size = 8,
+ .has_dmamode = false,
+ .dynamic_burst = false,
+ .has_slavemode = false,
+ .devtype = IMX27_CSPI,
+};
+
+static struct spi_imx_devtype_data imx31_cspi_devtype_data = {
+ .intctrl = mx31_intctrl,
+ .prepare_message = mx31_prepare_message,
+ .prepare_transfer = mx31_prepare_transfer,
+ .trigger = mx31_trigger,
+ .rx_available = mx31_rx_available,
+ .reset = mx31_reset,
+ .fifo_size = 8,
+ .has_dmamode = false,
+ .dynamic_burst = false,
+ .has_slavemode = false,
+ .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,
+ .prepare_message = mx31_prepare_message,
+ .prepare_transfer = mx31_prepare_transfer,
+ .trigger = mx31_trigger,
+ .rx_available = mx31_rx_available,
+ .reset = mx31_reset,
+ .fifo_size = 8,
+ .has_dmamode = true,
+ .dynamic_burst = false,
+ .has_slavemode = false,
+ .devtype = IMX35_CSPI,
+};
+
+static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
+ .intctrl = mx51_ecspi_intctrl,
+ .prepare_message = mx51_ecspi_prepare_message,
+ .prepare_transfer = mx51_ecspi_prepare_transfer,
+ .trigger = mx51_ecspi_trigger,
+ .rx_available = mx51_ecspi_rx_available,
+ .reset = mx51_ecspi_reset,
+ .setup_wml = mx51_setup_wml,
+ .disable_dma = mx51_disable_dma,
+ .fifo_size = 64,
+ .has_dmamode = true,
+ .dynamic_burst = true,
+ .has_slavemode = true,
+ .disable = mx51_ecspi_disable,
+ .devtype = IMX51_ECSPI,
+};
+
+static struct spi_imx_devtype_data imx53_ecspi_devtype_data = {
+ .intctrl = mx51_ecspi_intctrl,
+ .prepare_message = mx51_ecspi_prepare_message,
+ .prepare_transfer = mx51_ecspi_prepare_transfer,
+ .trigger = mx51_ecspi_trigger,
+ .rx_available = mx51_ecspi_rx_available,
+ .disable_dma = mx51_disable_dma,
+ .reset = mx51_ecspi_reset,
+ .fifo_size = 64,
+ .has_dmamode = true,
+ .has_slavemode = true,
+ .disable = mx51_ecspi_disable,
+ .devtype = IMX53_ECSPI,
+};
+
+static struct spi_imx_devtype_data imx6ul_ecspi_devtype_data = {
+ .intctrl = mx51_ecspi_intctrl,
+ .prepare_message = mx51_ecspi_prepare_message,
+ .prepare_transfer = mx51_ecspi_prepare_transfer,
+ .trigger = mx51_ecspi_trigger,
+ .rx_available = mx51_ecspi_rx_available,
+ .reset = mx51_ecspi_reset,
+ .setup_wml = mx51_setup_wml,
+ .fifo_size = 64,
+ .has_dmamode = true,
+ .dynamic_burst = true,
+ .has_slavemode = true,
+ .tx_glitch_fixed = true,
+ .disable = mx51_ecspi_disable,
+ .devtype = IMX51_ECSPI,
+};
+
+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, },
+ { .compatible = "fsl,imx53-ecspi", .data = &imx53_ecspi_devtype_data, },
+ { .compatible = "fsl,imx6ul-ecspi", .data = &imx6ul_ecspi_devtype_data, },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, spi_imx_dt_ids);
+
+static void spi_imx_set_burst_len(struct spi_imx_data *spi_imx, int n_bits)
+{
+ u32 ctrl;
+
+ ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
+ ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
+ ctrl |= ((n_bits - 1) << MX51_ECSPI_CTRL_BL_OFFSET);
+ writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
+}
+
+static void spi_imx_push(struct spi_imx_data *spi_imx)
+{
+ unsigned int burst_len;
+
+ /*
+ * Reload the FIFO when the remaining bytes to be transferred in the
+ * current burst is 0. This only applies when bits_per_word is a
+ * multiple of 8.
+ */
+ if (!spi_imx->remainder) {
+ if (spi_imx->dynamic_burst) {
+
+ /* We need to deal unaligned data first */
+ burst_len = spi_imx->count % MX51_ECSPI_CTRL_MAX_BURST;
+
+ if (!burst_len)
+ burst_len = MX51_ECSPI_CTRL_MAX_BURST;
+
+ spi_imx_set_burst_len(spi_imx, burst_len * 8);
+
+ spi_imx->remainder = burst_len;
+ } else {
+ spi_imx->remainder = spi_imx_bytes_per_word(spi_imx->bits_per_word);
+ }
+ }
+
+ while (spi_imx->txfifo < spi_imx->devtype_data->fifo_size) {
+ if (!spi_imx->count)
+ break;
+ if (spi_imx->dynamic_burst &&
+ spi_imx->txfifo >= DIV_ROUND_UP(spi_imx->remainder, 4))
+ break;
+ spi_imx->tx(spi_imx);
+ spi_imx->txfifo++;
+ }
+
+ if (!spi_imx->slave_mode)
+ spi_imx->devtype_data->trigger(spi_imx);
+}
+
+static irqreturn_t spi_imx_isr(int irq, void *dev_id)
+{
+ struct spi_imx_data *spi_imx = dev_id;
+
+ while (spi_imx->txfifo &&
+ 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;
+}
+
+static int spi_imx_dma_configure(struct spi_controller *controller)
+{
+ int ret;
+ enum dma_slave_buswidth buswidth;
+ struct dma_slave_config rx = {}, tx = {};
+ struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
+
+ switch (spi_imx_bytes_per_word(spi_imx->bits_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(controller->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(controller->dma_rx, &rx);
+ if (ret) {
+ dev_err(spi_imx->dev, "RX dma configuration failed with %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int spi_imx_setupxfer(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
+
+ if (!t)
+ return 0;
+
+ if (!t->speed_hz) {
+ if (!spi->max_speed_hz) {
+ dev_err(&spi->dev, "no speed_hz provided!\n");
+ return -EINVAL;
+ }
+ dev_dbg(&spi->dev, "using spi->max_speed_hz!\n");
+ spi_imx->spi_bus_clk = spi->max_speed_hz;
+ } else
+ spi_imx->spi_bus_clk = t->speed_hz;
+
+ spi_imx->bits_per_word = t->bits_per_word;
+
+ /*
+ * Initialize the functions for transfer. To transfer non byte-aligned
+ * words, we have to use multiple word-size bursts, we can't use
+ * dynamic_burst in that case.
+ */
+ if (spi_imx->devtype_data->dynamic_burst && !spi_imx->slave_mode &&
+ !(spi->mode & SPI_CS_WORD) &&
+ (spi_imx->bits_per_word == 8 ||
+ spi_imx->bits_per_word == 16 ||
+ spi_imx->bits_per_word == 32)) {
+
+ spi_imx->rx = spi_imx_buf_rx_swap;
+ spi_imx->tx = spi_imx_buf_tx_swap;
+ spi_imx->dynamic_burst = 1;
+
+ } else {
+ if (spi_imx->bits_per_word <= 8) {
+ spi_imx->rx = spi_imx_buf_rx_u8;
+ spi_imx->tx = spi_imx_buf_tx_u8;
+ } else if (spi_imx->bits_per_word <= 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;
+ }
+ spi_imx->dynamic_burst = 0;
+ }
+
+ if (spi_imx_can_dma(spi_imx->controller, spi, t))
+ spi_imx->usedma = true;
+ else
+ spi_imx->usedma = false;
+
+ spi_imx->rx_only = ((t->tx_buf == NULL)
+ || (t->tx_buf == spi->controller->dummy_tx));
+
+ if (is_imx53_ecspi(spi_imx) && spi_imx->slave_mode) {
+ spi_imx->rx = mx53_ecspi_rx_slave;
+ spi_imx->tx = mx53_ecspi_tx_slave;
+ spi_imx->slave_burst = t->len;
+ }
+
+ spi_imx->devtype_data->prepare_transfer(spi_imx, spi);
+
+ return 0;
+}
+
+static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx)
+{
+ struct spi_controller *controller = spi_imx->controller;
+
+ if (controller->dma_rx) {
+ dma_release_channel(controller->dma_rx);
+ controller->dma_rx = NULL;
+ }
+
+ if (controller->dma_tx) {
+ dma_release_channel(controller->dma_tx);
+ controller->dma_tx = NULL;
+ }
+}
+
+static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
+ struct spi_controller *controller)
+{
+ int ret;
+
+ spi_imx->wml = spi_imx->devtype_data->fifo_size / 2;
+
+ /* Prepare for TX DMA: */
+ controller->dma_tx = dma_request_chan(dev, "tx");
+ if (IS_ERR(controller->dma_tx)) {
+ ret = PTR_ERR(controller->dma_tx);
+ dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret);
+ controller->dma_tx = NULL;
+ goto err;
+ }
+
+ /* Prepare for RX : */
+ controller->dma_rx = dma_request_chan(dev, "rx");
+ if (IS_ERR(controller->dma_rx)) {
+ ret = PTR_ERR(controller->dma_rx);
+ dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret);
+ controller->dma_rx = NULL;
+ goto err;
+ }
+
+ init_completion(&spi_imx->dma_rx_completion);
+ init_completion(&spi_imx->dma_tx_completion);
+ controller->can_dma = spi_imx_can_dma;
+ controller->max_dma_len = MAX_SDMA_BD_BYTES;
+ spi_imx->controller->flags = SPI_CONTROLLER_MUST_RX |
+ SPI_CONTROLLER_MUST_TX;
+
+ return 0;
+err:
+ spi_imx_sdma_exit(spi_imx);
+ return ret;
+}
+
+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);
+}
+
+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);
+}
+
+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);
+}
+
+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_controller *controller = spi_imx->controller;
+ struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
+ struct scatterlist *last_sg = sg_last(rx->sgl, rx->nents);
+ unsigned int bytes_per_word, i;
+ int ret;
+
+ /* Get the right burst length from the last sg to ensure no tail data */
+ bytes_per_word = spi_imx_bytes_per_word(transfer->bits_per_word);
+ for (i = spi_imx->devtype_data->fifo_size / 2; i > 0; i--) {
+ if (!(sg_dma_len(last_sg) % (i * bytes_per_word)))
+ break;
+ }
+ /* Use 1 as wml in case no available burst length got */
+ if (i == 0)
+ i = 1;
+
+ spi_imx->wml = i;
+
+ ret = spi_imx_dma_configure(controller);
+ if (ret)
+ goto dma_failure_no_start;
+
+ if (!spi_imx->devtype_data->setup_wml) {
+ dev_err(spi_imx->dev, "No setup_wml()?\n");
+ ret = -EINVAL;
+ goto dma_failure_no_start;
+ }
+ spi_imx->devtype_data->setup_wml(spi_imx);
+
+ /*
+ * The TX DMA setup starts the transfer, so make sure RX is configured
+ * before TX.
+ */
+ desc_rx = dmaengine_prep_slave_sg(controller->dma_rx,
+ rx->sgl, rx->nents, DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc_rx) {
+ ret = -EINVAL;
+ goto dma_failure_no_start;
+ }
+
+ 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(controller->dma_rx);
+
+ desc_tx = dmaengine_prep_slave_sg(controller->dma_tx,
+ tx->sgl, tx->nents, DMA_MEM_TO_DEV,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc_tx) {
+ dmaengine_terminate_all(controller->dma_tx);
+ dmaengine_terminate_all(controller->dma_rx);
+ 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(controller->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(controller->dma_tx);
+ dmaengine_terminate_all(controller->dma_rx);
+ return -ETIMEDOUT;
+ }
+
+ timeout = wait_for_completion_timeout(&spi_imx->dma_rx_completion,
+ transfer_timeout);
+ if (!timeout) {
+ dev_err(&controller->dev, "I/O Error in DMA RX\n");
+ spi_imx->devtype_data->reset(spi_imx);
+ dmaengine_terminate_all(controller->dma_rx);
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+/* fallback to pio */
+dma_failure_no_start:
+ transfer->error |= SPI_TRANS_FAIL_NO_START;
+ return ret;
+}
+
+static int spi_imx_pio_transfer(struct spi_device *spi,
+ struct spi_transfer *transfer)
+{
+ struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
+ 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;
+ spi_imx->remainder = 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 0;
+}
+
+static int spi_imx_poll_transfer(struct spi_device *spi,
+ struct spi_transfer *transfer)
+{
+ struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
+ 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;
+ spi_imx->remainder = 0;
+
+ /* fill in the fifo before timeout calculations if we are
+ * interrupted here, then the data is getting transferred by
+ * the HW while we are interrupted
+ */
+ spi_imx_push(spi_imx);
+
+ timeout = spi_imx_calculate_timeout(spi_imx, transfer->len) + jiffies;
+ while (spi_imx->txfifo) {
+ /* RX */
+ while (spi_imx->txfifo &&
+ spi_imx->devtype_data->rx_available(spi_imx)) {
+ spi_imx->rx(spi_imx);
+ spi_imx->txfifo--;
+ }
+
+ /* TX */
+ if (spi_imx->count) {
+ spi_imx_push(spi_imx);
+ continue;
+ }
+
+ if (spi_imx->txfifo &&
+ time_after(jiffies, timeout)) {
+
+ dev_err_ratelimited(&spi->dev,
+ "timeout period reached: jiffies: %lu- falling back to interrupt mode\n",
+ jiffies - timeout);
+
+ /* fall back to interrupt mode */
+ return spi_imx_pio_transfer(spi, transfer);
+ }
+ }
+
+ return 0;
+}
+
+static int spi_imx_pio_transfer_slave(struct spi_device *spi,
+ struct spi_transfer *transfer)
+{
+ struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
+ int ret = 0;
+
+ if (is_imx53_ecspi(spi_imx) &&
+ transfer->len > MX53_MAX_TRANSFER_BYTES) {
+ dev_err(&spi->dev, "Transaction too big, max size is %d bytes\n",
+ MX53_MAX_TRANSFER_BYTES);
+ return -EMSGSIZE;
+ }
+
+ spi_imx->tx_buf = transfer->tx_buf;
+ spi_imx->rx_buf = transfer->rx_buf;
+ spi_imx->count = transfer->len;
+ spi_imx->txfifo = 0;
+ spi_imx->remainder = 0;
+
+ reinit_completion(&spi_imx->xfer_done);
+ spi_imx->slave_aborted = false;
+
+ spi_imx_push(spi_imx);
+
+ spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE | MXC_INT_RDR);
+
+ if (wait_for_completion_interruptible(&spi_imx->xfer_done) ||
+ spi_imx->slave_aborted) {
+ dev_dbg(&spi->dev, "interrupted\n");
+ ret = -EINTR;
+ }
+
+ /* ecspi has a HW issue when works in Slave mode,
+ * after 64 words writtern to TXFIFO, even TXFIFO becomes empty,
+ * ECSPI_TXDATA keeps shift out the last word data,
+ * so we have to disable ECSPI when in slave mode after the
+ * transfer completes
+ */
+ if (spi_imx->devtype_data->disable)
+ spi_imx->devtype_data->disable(spi_imx);
+
+ return ret;
+}
+
+static int spi_imx_transfer_one(struct spi_controller *controller,
+ struct spi_device *spi,
+ struct spi_transfer *transfer)
+{
+ struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
+ unsigned long hz_per_byte, byte_limit;
+
+ spi_imx_setupxfer(spi, transfer);
+ transfer->effective_speed_hz = spi_imx->spi_bus_clk;
+
+ /* flush rxfifo before transfer */
+ while (spi_imx->devtype_data->rx_available(spi_imx))
+ readl(spi_imx->base + MXC_CSPIRXDATA);
+
+ if (spi_imx->slave_mode)
+ return spi_imx_pio_transfer_slave(spi, transfer);
+
+ /*
+ * If we decided in spi_imx_can_dma() that we want to do a DMA
+ * transfer, the SPI transfer has already been mapped, so we
+ * have to do the DMA transfer here.
+ */
+ if (spi_imx->usedma)
+ return spi_imx_dma_transfer(spi_imx, transfer);
+ /*
+ * Calculate the estimated time in us the transfer runs. Find
+ * the number of Hz per byte per polling limit.
+ */
+ hz_per_byte = polling_limit_us ? ((8 + 4) * USEC_PER_SEC) / polling_limit_us : 0;
+ byte_limit = hz_per_byte ? transfer->effective_speed_hz / hz_per_byte : 1;
+
+ /* run in polling mode for short transfers */
+ if (transfer->len < byte_limit)
+ return spi_imx_poll_transfer(spi, transfer);
+
+ return spi_imx_pio_transfer(spi, transfer);
+}
+
+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);
+
+ return 0;
+}
+
+static void spi_imx_cleanup(struct spi_device *spi)
+{
+}
+
+static int
+spi_imx_prepare_message(struct spi_controller *controller, struct spi_message *msg)
+{
+ struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
+ int ret;
+
+ ret = pm_runtime_resume_and_get(spi_imx->dev);
+ if (ret < 0) {
+ dev_err(spi_imx->dev, "failed to enable clock\n");
+ return ret;
+ }
+
+ ret = spi_imx->devtype_data->prepare_message(spi_imx, msg);
+ if (ret) {
+ pm_runtime_mark_last_busy(spi_imx->dev);
+ pm_runtime_put_autosuspend(spi_imx->dev);
+ }
+
+ return ret;
+}
+
+static int
+spi_imx_unprepare_message(struct spi_controller *controller, struct spi_message *msg)
+{
+ struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
+
+ pm_runtime_mark_last_busy(spi_imx->dev);
+ pm_runtime_put_autosuspend(spi_imx->dev);
+ return 0;
+}
+
+static int spi_imx_slave_abort(struct spi_controller *controller)
+{
+ struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
+
+ spi_imx->slave_aborted = true;
+ complete(&spi_imx->xfer_done);
+
+ return 0;
+}
+
+static int spi_imx_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct spi_controller *controller;
+ struct spi_imx_data *spi_imx;
+ struct resource *res;
+ int ret, irq, spi_drctl;
+ const struct spi_imx_devtype_data *devtype_data =
+ of_device_get_match_data(&pdev->dev);
+ bool slave_mode;
+ u32 val;
+
+ slave_mode = devtype_data->has_slavemode &&
+ of_property_read_bool(np, "spi-slave");
+ if (slave_mode)
+ controller = spi_alloc_slave(&pdev->dev,
+ sizeof(struct spi_imx_data));
+ else
+ controller = spi_alloc_master(&pdev->dev,
+ sizeof(struct spi_imx_data));
+ if (!controller)
+ return -ENOMEM;
+
+ ret = of_property_read_u32(np, "fsl,spi-rdy-drctl", &spi_drctl);
+ if ((ret < 0) || (spi_drctl >= 0x3)) {
+ /* '11' is reserved */
+ spi_drctl = 0;
+ }
+
+ platform_set_drvdata(pdev, controller);
+
+ controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
+ controller->bus_num = np ? -1 : pdev->id;
+ controller->use_gpio_descriptors = true;
+
+ spi_imx = spi_controller_get_devdata(controller);
+ spi_imx->controller = controller;
+ spi_imx->dev = &pdev->dev;
+ spi_imx->slave_mode = slave_mode;
+
+ spi_imx->devtype_data = devtype_data;
+
+ /*
+ * Get number of chip selects from device properties. This can be
+ * coming from device tree or boardfiles, if it is not defined,
+ * a default value of 3 chip selects will be used, as all the legacy
+ * board files have <= 3 chip selects.
+ */
+ if (!device_property_read_u32(&pdev->dev, "num-cs", &val))
+ controller->num_chipselect = val;
+ else
+ controller->num_chipselect = 3;
+
+ spi_imx->controller->transfer_one = spi_imx_transfer_one;
+ spi_imx->controller->setup = spi_imx_setup;
+ spi_imx->controller->cleanup = spi_imx_cleanup;
+ spi_imx->controller->prepare_message = spi_imx_prepare_message;
+ spi_imx->controller->unprepare_message = spi_imx_unprepare_message;
+ spi_imx->controller->slave_abort = spi_imx_slave_abort;
+ spi_imx->controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_NO_CS;
+
+ if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) ||
+ is_imx53_ecspi(spi_imx))
+ spi_imx->controller->mode_bits |= SPI_LOOP | SPI_READY;
+
+ if (is_imx51_ecspi(spi_imx) || is_imx53_ecspi(spi_imx))
+ spi_imx->controller->mode_bits |= SPI_RX_CPHA_FLIP;
+
+ if (is_imx51_ecspi(spi_imx) &&
+ device_property_read_u32(&pdev->dev, "cs-gpios", NULL))
+ /*
+ * When using HW-CS implementing SPI_CS_WORD can be done by just
+ * setting the burst length to the word size. This is
+ * considerably faster than manually controlling the CS.
+ */
+ spi_imx->controller->mode_bits |= SPI_CS_WORD;
+
+ spi_imx->spi_drctl = spi_drctl;
+
+ 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_controller_put;
+ }
+ spi_imx->base_phys = res->start;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ ret = irq;
+ goto out_controller_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_controller_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_controller_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_controller_put;
+ }
+
+ ret = clk_prepare_enable(spi_imx->clk_per);
+ if (ret)
+ goto out_controller_put;
+
+ ret = clk_prepare_enable(spi_imx->clk_ipg);
+ if (ret)
+ goto out_put_per;
+
+ pm_runtime_set_autosuspend_delay(spi_imx->dev, MXC_RPM_TIMEOUT);
+ pm_runtime_use_autosuspend(spi_imx->dev);
+ pm_runtime_get_noresume(spi_imx->dev);
+ pm_runtime_set_active(spi_imx->dev);
+ pm_runtime_enable(spi_imx->dev);
+
+ 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 (spi_imx->devtype_data->has_dmamode) {
+ ret = spi_imx_sdma_init(&pdev->dev, spi_imx, controller);
+ if (ret == -EPROBE_DEFER)
+ goto out_runtime_pm_put;
+
+ if (ret < 0)
+ dev_dbg(&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);
+
+ controller->dev.of_node = pdev->dev.of_node;
+ ret = spi_register_controller(controller);
+ if (ret) {
+ dev_err_probe(&pdev->dev, ret, "register controller failed\n");
+ goto out_register_controller;
+ }
+
+ pm_runtime_mark_last_busy(spi_imx->dev);
+ pm_runtime_put_autosuspend(spi_imx->dev);
+
+ return ret;
+
+out_register_controller:
+ if (spi_imx->devtype_data->has_dmamode)
+ spi_imx_sdma_exit(spi_imx);
+out_runtime_pm_put:
+ pm_runtime_dont_use_autosuspend(spi_imx->dev);
+ pm_runtime_set_suspended(&pdev->dev);
+ pm_runtime_disable(spi_imx->dev);
+
+ clk_disable_unprepare(spi_imx->clk_ipg);
+out_put_per:
+ clk_disable_unprepare(spi_imx->clk_per);
+out_controller_put:
+ spi_controller_put(controller);
+
+ return ret;
+}
+
+static int spi_imx_remove(struct platform_device *pdev)
+{
+ struct spi_controller *controller = platform_get_drvdata(pdev);
+ struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
+ int ret;
+
+ spi_unregister_controller(controller);
+
+ ret = pm_runtime_get_sync(spi_imx->dev);
+ if (ret >= 0)
+ writel(0, spi_imx->base + MXC_CSPICTRL);
+ else
+ dev_warn(spi_imx->dev, "failed to enable clock, skip hw disable\n");
+
+ pm_runtime_dont_use_autosuspend(spi_imx->dev);
+ pm_runtime_put_sync(spi_imx->dev);
+ pm_runtime_disable(spi_imx->dev);
+
+ spi_imx_sdma_exit(spi_imx);
+
+ return 0;
+}
+
+static int __maybe_unused spi_imx_runtime_resume(struct device *dev)
+{
+ struct spi_controller *controller = dev_get_drvdata(dev);
+ struct spi_imx_data *spi_imx;
+ int ret;
+
+ spi_imx = spi_controller_get_devdata(controller);
+
+ ret = clk_prepare_enable(spi_imx->clk_per);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(spi_imx->clk_ipg);
+ if (ret) {
+ clk_disable_unprepare(spi_imx->clk_per);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int __maybe_unused spi_imx_runtime_suspend(struct device *dev)
+{
+ struct spi_controller *controller = dev_get_drvdata(dev);
+ struct spi_imx_data *spi_imx;
+
+ spi_imx = spi_controller_get_devdata(controller);
+
+ clk_disable_unprepare(spi_imx->clk_per);
+ clk_disable_unprepare(spi_imx->clk_ipg);
+
+ return 0;
+}
+
+static int __maybe_unused spi_imx_suspend(struct device *dev)
+{
+ pinctrl_pm_select_sleep_state(dev);
+ return 0;
+}
+
+static int __maybe_unused spi_imx_resume(struct device *dev)
+{
+ pinctrl_pm_select_default_state(dev);
+ return 0;
+}
+
+static const struct dev_pm_ops imx_spi_pm = {
+ SET_RUNTIME_PM_OPS(spi_imx_runtime_suspend,
+ spi_imx_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(spi_imx_suspend, spi_imx_resume)
+};
+
+static struct platform_driver spi_imx_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = spi_imx_dt_ids,
+ .pm = &imx_spi_pm,
+ },
+ .probe = spi_imx_probe,
+ .remove = spi_imx_remove,
+};
+module_platform_driver(spi_imx_driver);
+
+MODULE_DESCRIPTION("i.MX SPI Controller driver");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);