[PATCH 0/4] spi: st: New driver for ST's SPI Controller

[PATCH 0/4] spi: st: New driver for ST's SPI Controller

[Lee Jones]

This is a new driver which controls the SPI component of ST's
Synchronous Serial Controller (SSC).

Lee Jones (4):
  spi: Add new driver for STMicroelectronics' SPI Controller
  spi: st: Provide Device Tree binding documentation
  ARM: sti: Provide DT nodes for SSC[0..4]
  ARM: sti: Provide DT nodes for SBC SSC[0..2]

 Documentation/devicetree/bindings/spi/spi-st.txt |  40 ++
 arch/arm/boot/dts/stih407.dtsi                   |  85 ++++
 drivers/spi/Kconfig                              |   8 +
 drivers/spi/Makefile                             |   1 +
 drivers/spi/spi-st.c                             | 535 +++++++++++++++++++++++
 5 files changed, 669 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/spi-st.txt
 create mode 100644 drivers/spi/spi-st.c

-- 
1.9.1

[PATCH 1/4] spi: Add new driver for STMicroelectronics' SPI Controller

[Lee Jones]

This patch adds support for the SPI portion of ST's SSC device.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/spi/Kconfig  |   8 +
 drivers/spi/Makefile |   1 +
 drivers/spi/spi-st.c | 535 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 544 insertions(+)
 create mode 100644 drivers/spi/spi-st.c

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 84e7c9e..78793a9 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -488,6 +488,14 @@ config SPI_SIRF
 	help
 	  SPI driver for CSR SiRFprimaII SoCs
 
+config SPI_ST
+	tristate "STMicroelectronics SPI SSC-based driver"
+	depends on ARCH_STI
+	select SPI_BITBANG
+	help
+	  STMicroelectronics SoCs support for SPI. If you say yes to
+	  this option, support will be included for the SSC driven SPI.
+
 config SPI_SUN4I
 	tristate "Allwinner A10 SoCs SPI controller"
 	depends on ARCH_SUNXI || COMPILE_TEST
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 78f24ca..3a2535c 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -74,6 +74,7 @@ obj-$(CONFIG_SPI_SH_HSPI)		+= spi-sh-hspi.o
 obj-$(CONFIG_SPI_SH_MSIOF)		+= spi-sh-msiof.o
 obj-$(CONFIG_SPI_SH_SCI)		+= spi-sh-sci.o
 obj-$(CONFIG_SPI_SIRF)		+= spi-sirf.o
+obj-$(CONFIG_SPI_ST)			+= spi-st.o
 obj-$(CONFIG_SPI_SUN4I)			+= spi-sun4i.o
 obj-$(CONFIG_SPI_SUN6I)			+= spi-sun6i.o
 obj-$(CONFIG_SPI_TEGRA114)		+= spi-tegra114.o
diff --git a/drivers/spi/spi-st.c b/drivers/spi/spi-st.c
new file mode 100644
index 0000000..3355e35
--- /dev/null
+++ b/drivers/spi/spi-st.c
@@ -0,0 +1,535 @@
+/*
+ *  Copyright (c) 2008-2014 STMicroelectronics Limited
+ *
+ *  Author: Angus Clark <Angus.Clark@st.com>
+ *  Author: Patrice Chotard <patrice.chotard@st.com>
+ *
+ *  SPI master mode controller driver, used in STMicroelectronics devices.
+ *
+ *  May be copied or modified under the terms of the GNU General Public
+ *  License Version 2.0 only.  See linux/COPYING for more information.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_gpio.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi_bitbang.h>
+
+/* SSC registers */
+#define SSC_BRG				0x000
+#define SSC_TBUF			0x004
+#define SSC_RBUF			0x008
+#define SSC_CTL				0x00C
+#define SSC_IEN				0x010
+#define SSC_I2C				0x018
+
+/* SSC Control */
+#define SSC_CTL_DATA_WIDTH_9		0x8
+#define SSC_CTL_DATA_WIDTH_MSK		0xf
+#define SSC_CTL_BM			0xf
+#define SSC_CTL_HB			BIT(4)
+#define SSC_CTL_PH			BIT(5)
+#define SSC_CTL_PO			BIT(6)
+#define SSC_CTL_SR			BIT(7)
+#define SSC_CTL_MS			BIT(8)
+#define SSC_CTL_EN			BIT(9)
+#define SSC_CTL_LPB			BIT(10)
+#define SSC_CTL_EN_TX_FIFO		BIT(11)
+#define SSC_CTL_EN_RX_FIFO		BIT(12)
+#define SSC_CTL_EN_CLST_RX		BIT(13)
+
+/* SSC Interrupt Enable */
+#define SSC_IEN_TEEN			BIT(2)
+
+#define FIFO_SIZE			8
+
+struct spi_st {
+	/* SSC SPI Controller */
+	struct spi_bitbang	bitbang;
+	void __iomem		*base;
+	struct clk		*clk;
+	struct device		*dev;
+	int			irq;
+
+	/* SSC SPI current transaction */
+	const u8		*tx_ptr;
+	u8			*rx_ptr;
+	u16			bits_per_word;
+	u16			bytes_per_word;
+	unsigned int		baud;
+	unsigned int		words_remaining;
+	struct completion	done;
+	struct pinctrl_state	*pins_sleep;
+};
+
+static void spi_st_gpio_chipselect(struct spi_device *spi, int is_active)
+{
+	int cs = spi->cs_gpio;
+	int out;
+
+	if (cs == -ENOENT)
+		return;
+
+	out = (spi->mode & SPI_CS_HIGH) ? is_active : !is_active;
+	gpio_set_value(cs, out);
+
+	dev_dbg(&spi->dev, "%s GPIO %u -> %d\n",
+		is_active ? "select" : "deselect", cs, out);
+
+	return;
+}
+
+static int spi_st_setup_transfer(struct spi_device *spi,
+				 struct spi_transfer *t)
+{
+	struct spi_st *spi_st = spi_master_get_devdata(spi->master);
+	u32 spi_st_clk, sscbrg, var, hz;
+	u8 bits_per_word;
+
+	bits_per_word 	= t ? t->bits_per_word	: spi->bits_per_word;
+	hz		= t ? t->speed_hz	: spi->max_speed_hz;
+
+	/* Actually, can probably support 2-16 without any other changees */
+	if (bits_per_word != 8 && bits_per_word != 16) {
+		dev_err(&spi->dev, "unsupported bits_per_word %d\n",
+			bits_per_word);
+		return -EINVAL;
+	}
+	spi_st->bits_per_word = bits_per_word;
+
+	spi_st_clk = clk_get_rate(spi_st->clk);
+
+	/* Set SSC_BRF */
+	sscbrg = spi_st_clk / (2 * hz);
+	if (sscbrg < 0x07 || sscbrg > (0x1 << 16)) {
+		dev_err(&spi->dev,
+			"baudrate %d outside valid range %d\n", sscbrg, hz);
+		return -EINVAL;
+	}
+
+	spi_st->baud = spi_st_clk / (2 * sscbrg);
+	if (sscbrg == (0x1 << 16)) /* 16-bit counter wraps */
+		sscbrg = 0x0;
+
+	writel_relaxed(sscbrg, spi_st->base + SSC_BRG);
+
+	dev_dbg(&spi->dev,
+		"setting baudrate:target= %u hz, actual= %u hz, sscbrg= %u\n",
+		hz, spi_st->baud, sscbrg);
+
+	 /* Set SSC_CTL and enable SSC */
+	 var = readl_relaxed(spi_st->base + SSC_CTL);
+	 var |= SSC_CTL_MS;
+
+	 if (spi->mode & SPI_CPOL)
+		var |= SSC_CTL_PO;
+	 else
+		var &= ~SSC_CTL_PO;
+
+	 if (spi->mode & SPI_CPHA)
+		var |= SSC_CTL_PH;
+	 else
+		var &= ~SSC_CTL_PH;
+
+	 if ((spi->mode & SPI_LSB_FIRST) == 0)
+		var |= SSC_CTL_HB;
+	 else
+		var &= ~SSC_CTL_HB;
+
+	 if (spi->mode & SPI_LOOP)
+		var |= SSC_CTL_LPB;
+	 else
+		var &= ~SSC_CTL_LPB;
+
+	 var &= ~SSC_CTL_DATA_WIDTH_MSK;
+	 var |= (bits_per_word - 1);
+
+	 var |= SSC_CTL_EN_TX_FIFO | SSC_CTL_EN_RX_FIFO;
+	 var |= SSC_CTL_EN;
+
+	 writel_relaxed(var, spi_st->base + SSC_CTL);
+
+	 /* Clear the status register */
+	 readl_relaxed(spi_st->base + SSC_RBUF);
+
+	 return 0;
+}
+
+static void spi_st_cleanup(struct spi_device *spi)
+{
+	int cs = spi->cs_gpio;
+	
+	if (cs != -ENOENT)
+		gpio_free(cs);
+}
+
+/* the spi->mode bits understood by this driver: */
+#define MODEBITS  (SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_LOOP | SPI_CS_HIGH)
+static int spi_st_setup(struct spi_device *spi)
+{
+	int cs = spi->cs_gpio;
+	int ret;
+
+	if (spi->mode & ~MODEBITS) {
+		dev_err(&spi->dev, "unsupported mode bits 0x%x\n",
+			spi->mode & ~MODEBITS);
+		return -EINVAL;
+	}
+
+	if (!spi->max_speed_hz)  {
+		dev_err(&spi->dev, "max_speed_hz unspecified\n");
+		return -EINVAL;
+	}
+
+	if (!spi->bits_per_word)
+		spi->bits_per_word = 8;
+
+	if (cs != -ENOENT) {
+		ret = gpio_direction_output(cs, spi->mode & SPI_CS_HIGH);
+		if (ret)
+			return ret;
+	}
+
+	return spi_st_setup_transfer(spi, NULL);
+}
+
+/* Load the TX FIFO */
+static void ssc_write_tx_fifo(struct spi_st *spi_st)
+{
+	unsigned int count, i;
+	uint32_t word = 0;
+	
+	if (spi_st->words_remaining > FIFO_SIZE)
+		count = FIFO_SIZE;
+	else
+		count = spi_st->words_remaining;
+
+	for (i = 0; i < count; i++) {
+		if (spi_st->tx_ptr) {
+			if (spi_st->bytes_per_word == 1) {
+				word = *spi_st->tx_ptr++;
+			} else {
+				word = *spi_st->tx_ptr++;
+				word = *spi_st->tx_ptr++ | (word << 8);
+			}
+		}
+		writel_relaxed(word, spi_st->base + SSC_TBUF);
+	}
+}
+
+/* Read the RX FIFO */
+static void ssc_read_rx_fifo(struct spi_st *spi_st)
+{
+	unsigned int count, i;
+	uint32_t word = 0;
+
+	if (spi_st->words_remaining > FIFO_SIZE)
+		count = FIFO_SIZE;
+	else
+		count = spi_st->words_remaining;
+
+	for (i = 0; i < count; i++) {
+		word = readl_relaxed(spi_st->base + SSC_RBUF);
+		if (spi_st->rx_ptr) {
+			if (spi_st->bytes_per_word == 1) {
+				*spi_st->rx_ptr++ = (uint8_t)word;
+			} else {
+				*spi_st->rx_ptr++ = (word >> 8);
+				*spi_st->rx_ptr++ = word & 0xff;
+			}
+		}
+	}
+	spi_st->words_remaining -= count;
+}
+
+/* Interrupt fired when TX shift register becomes empty */
+static irqreturn_t spi_st_irq(int irq, void *dev_id)
+{
+	struct spi_st *spi_st = (struct spi_st *)dev_id;
+
+	/* Read RX FIFO */
+	ssc_read_rx_fifo(spi_st);
+
+	/* Fill TX FIFO */
+	if (spi_st->words_remaining) {
+		ssc_write_tx_fifo(spi_st);
+	} else {
+		/* TX/RX complete */
+		writel_relaxed(0x0, spi_st->base + SSC_IEN);
+		/*
+		 * read SSC_IEN to ensure that this bit is set
+		 * before re-enabling interrupt
+		 */
+		readl(spi_st->base + SSC_IEN);
+		complete(&spi_st->done);
+	}
+
+	return IRQ_HANDLED;
+}
+
+
+static int spi_st_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
+{
+	struct spi_st *spi_st = spi_master_get_devdata(spi->master);
+	uint32_t ctl = 0;
+
+	pm_runtime_get_sync(spi_st->dev);
+
+	/* Setup transfer */
+	spi_st->tx_ptr = t->tx_buf;
+	spi_st->rx_ptr = t->rx_buf;
+
+	if (spi_st->bits_per_word > 8) {
+		/*
+		 * Anything greater than 8 bits-per-word requires 2
+		 * bytes-per-word in the RX/TX buffers
+		 */
+		spi_st->bytes_per_word = 2;
+		spi_st->words_remaining = t->len / 2;
+
+	} else if (spi_st->bits_per_word == 8 && !(t->len & 0x1)) {
+		/*
+		 * If transfer is even-length, and 8 bits-per-word, then
+		 * implement as half-length 16 bits-per-word transfer
+		 */
+		spi_st->bytes_per_word = 2;
+		spi_st->words_remaining = t->len/2;
+
+		/* Set SSC_CTL to 16 bits-per-word */
+		ctl = readl_relaxed(spi_st->base + SSC_CTL);
+		writel_relaxed((ctl | 0xf), spi_st->base + SSC_CTL);
+
+		readl_relaxed(spi_st->base + SSC_RBUF);
+
+	} else {
+		spi_st->bytes_per_word = 1;
+		spi_st->words_remaining = t->len;
+	}
+
+	init_completion(&spi_st->done);
+
+	/* Start transfer by writing to the TX FIFO */
+	ssc_write_tx_fifo(spi_st);
+	writel_relaxed(SSC_IEN_TEEN, spi_st->base + SSC_IEN);
+
+	/* Wait for transfer to complete */
+	wait_for_completion(&spi_st->done);
+
+	/* Restore SSC_CTL if necessary */
+	if (ctl)
+		writel_relaxed(ctl, spi_st->base + SSC_CTL);
+
+	pm_runtime_put(spi_st->dev);
+
+	return t->len;
+}
+
+static int spi_st_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
+	struct spi_master *master;
+	struct resource *res;
+	struct spi_st *spi_st;
+	int num_cs, cs_gpio, i, ret = 0;
+	u32 var;
+	
+	printk("LEE: %s: %s()[%d]: Probing\n", __FILE__, __func__, __LINE__);
+
+	master = spi_alloc_master(&pdev->dev, sizeof(*spi_st));
+	if (!master) {
+		dev_err(&pdev->dev, "failed to allocate spi master\n");
+		return -ENOMEM;
+	}
+	spi_st = spi_master_get_devdata(master);
+
+	if (!IS_ERR(dev->pins->p)) {
+		spi_st->pins_sleep =
+			pinctrl_lookup_state(dev->pins->p, PINCTRL_STATE_SLEEP);
+		if (IS_ERR(spi_st->pins_sleep))
+			dev_warn(&pdev->dev, "could not get sleep pinstate\n");
+	}
+
+	num_cs = of_gpio_named_count(np, "cs-gpios");
+
+	for (i = 0; i < num_cs; i++) {
+		cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
+
+		if (!gpio_is_valid(cs_gpio)) {
+			dev_err(&pdev->dev,
+				"%d is not a valid gpio\n", cs_gpio);
+			return -EINVAL;
+		}
+			
+		if (devm_gpio_request(&pdev->dev, cs_gpio, pdev->name)) {
+			dev_err(&pdev->dev,
+				"could not request %d gpio\n", cs_gpio);
+			return -EINVAL;
+		}
+	}
+
+	spi_st->clk = of_clk_get_by_name(np, "ssc");
+	if (IS_ERR(spi_st->clk)) {
+		dev_err(&pdev->dev, "Unable to request clock\n");
+		ret = PTR_ERR(spi_st->clk);
+		goto free_master;
+	}
+
+	ret = clk_prepare_enable(spi_st->clk);
+	if (ret)
+		goto free_master;
+
+	master->dev.of_node		= np;
+	master->bus_num			= pdev->id;
+	master->mode_bits		= MODEBITS;
+	spi_st->bitbang.master		= spi_master_get(master);
+	spi_st->bitbang.setup_transfer	= spi_st_setup_transfer;
+	spi_st->bitbang.txrx_bufs	= spi_st_txrx_bufs;
+	spi_st->bitbang.master->setup	= spi_st_setup;
+	spi_st->bitbang.master->cleanup	= spi_st_cleanup;
+	spi_st->bitbang.chipselect	= spi_st_gpio_chipselect;
+	spi_st->dev			= dev;
+
+	init_completion(&spi_st->done);
+
+	/* Get resources */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	spi_st->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(spi_st->base)) {
+		ret = PTR_ERR(spi_st->base);
+		goto clk_disable;
+	}
+
+	spi_st->irq = irq_of_parse_and_map(np, 0);
+	if (!spi_st->irq) {
+		dev_err(&pdev->dev, "IRQ missing or invalid\n");
+		ret = -EINVAL;
+		goto clk_disable;
+	}
+
+	ret = devm_request_irq(&pdev->dev, spi_st->irq, spi_st_irq, 0,
+			       pdev->name, spi_st);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to request irq %d\n", spi_st->irq);
+		goto clk_disable;
+	}
+
+	/* Disable I2C and Reset SSC */
+	writel_relaxed(0x0, spi_st->base + SSC_I2C);
+	var = readw(spi_st->base + SSC_CTL);
+	var |= SSC_CTL_SR;
+	writel_relaxed(var, spi_st->base + SSC_CTL);
+
+	udelay(1);
+	var = readl_relaxed(spi_st->base + SSC_CTL);
+	var &= ~SSC_CTL_SR;
+	writel_relaxed(var, spi_st->base + SSC_CTL);
+
+	/* Set SSC into slave mode before reconfiguring PIO pins */
+	var = readl_relaxed(spi_st->base + SSC_CTL);
+	var &= ~SSC_CTL_MS;
+	writel_relaxed(var, spi_st->base + SSC_CTL);
+
+	/* Start "bitbang" worker */
+	ret = spi_bitbang_start(&spi_st->bitbang);
+	if (ret) {
+		dev_err(&pdev->dev, "bitbang start failed [%d]\n", ret);
+		goto clk_disable;
+	}
+
+	dev_info(&pdev->dev, "registered SPI Bus %d\n", master->bus_num);
+
+	platform_set_drvdata(pdev, master);
+
+	/* by default the device is on */
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
+	return 0;
+
+clk_disable:
+	clk_disable_unprepare(spi_st->clk);
+free_master:
+	spi_master_put(master);
+
+	return ret;
+}
+
+static int spi_st_remove(struct platform_device *pdev)
+{
+	struct spi_master *master = platform_get_drvdata(pdev);
+	struct spi_st *spi_st = spi_master_get_devdata(master);
+
+	spi_bitbang_stop(&spi_st->bitbang);
+	clk_disable_unprepare(spi_st->clk);
+
+	if (spi_st->pins_sleep)
+		pinctrl_select_state(pdev->dev.pins->p, spi_st->pins_sleep);
+
+	spi_master_put(spi_st->bitbang.master);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int spi_st_suspend(struct device *dev)
+{
+	struct spi_master *master = dev_get_drvdata(dev);
+	struct spi_st *spi_st = spi_master_get_devdata(master);
+
+	writel_relaxed(0, spi_st->base + SSC_IEN);
+
+	if (!IS_ERR(spi_st->pins_sleep))
+		pinctrl_select_state(dev->pins->p, spi_st->pins_sleep);
+
+	clk_disable_unprepare(spi_st->clk);
+
+	return 0;
+}
+
+static int spi_st_resume(struct device *dev)
+{
+	struct spi_master *master = dev_get_drvdata(dev);
+	struct spi_st *spi_st = spi_master_get_devdata(master);
+	int ret;
+
+	ret = clk_prepare_enable(spi_st->clk);
+
+	if (!IS_ERR(dev->pins->default_state))
+		pinctrl_select_state(dev->pins->p, dev->pins->default_state);
+
+	return ret;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(spi_st_pm, spi_st_suspend, spi_st_resume);
+
+static struct of_device_id stm_spi_match[] = {
+	{ .compatible = "st,comms-ssc-spi", },
+	{ .compatible = "st,comms-ssc4-spi", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, stm_spi_match);
+
+static struct platform_driver spi_st_driver = {
+	.driver = {
+		.name = "spi-st",
+		.pm = &spi_st_pm,
+		.of_match_table = of_match_ptr(stm_spi_match),
+	},
+	.probe = spi_st_probe,
+	.remove = spi_st_remove,
+};
+module_platform_driver(spi_st_driver);
+
+MODULE_AUTHOR("Patrice Chotard <patrice.chotard@st.com>");
+MODULE_DESCRIPTION("STM SSC SPI driver");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1

[STLinux Kernel] [PATCH 1/4] spi: Add new driver for STMicroelectronics' SPI Controller

[Peter Griffin]

Hi Lee,

<snip>

> +static int spi_st_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct device *dev = &pdev->dev;
> +	struct spi_master *master;
> +	struct resource *res;
> +	struct spi_st *spi_st;
> +	int num_cs, cs_gpio, i, ret = 0;
> +	u32 var;
> +	
> +	printk("LEE: %s: %s()[%d]: Probing\n", __FILE__, __func__, __LINE__);

You've left a debug print in here.

regards,

Peter.

[PATCH 1/4] spi: Add new driver for STMicroelectronics' SPI Controller

[Mark Brown]

On Thu, Nov 27, 2014 at 11:43:53AM +0000, Lee Jones wrote:

> +config SPI_ST
> +	tristate "STMicroelectronics SPI SSC-based driver"

Please select a more specific symbol, I bet ST already have other sPI
controllers.  Based on the descripton SPI_ST_SSC might work.

> +	depends on ARCH_STI

Please add an || COMPILE_TEST unless there's a good reason not to,
there's no obvious one.  You may have an OF dependency though if the
functions you call aren't stubbed, I've not checked.

> +struct spi_st {
> +	/* SSC SPI Controller */
> +	struct spi_bitbang	bitbang;

Is there a good reason for using bitbang over the core transmit_one()
interface?  The operations are basically the same but more modern and
the functionality is more discoverable.

> +static void spi_st_gpio_chipselect(struct spi_device *spi, int is_active)
> +{
> +	int cs = spi->cs_gpio;
> +	int out;
> +
> +	if (cs == -ENOENT)
> +		return;
> +
> +	out = (spi->mode & SPI_CS_HIGH) ? is_active : !is_active;
> +	gpio_set_value(cs, out);

The core can handle GPIO chip selects automatically.

> +static int spi_st_setup_transfer(struct spi_device *spi,
> +				 struct spi_transfer *t)
> +{
> +	struct spi_st *spi_st = spi_master_get_devdata(spi->master);
> +	u32 spi_st_clk, sscbrg, var, hz;
> +	u8 bits_per_word;
> +
> +	bits_per_word 	= t ? t->bits_per_word	: spi->bits_per_word;
> +	hz		= t ? t->speed_hz	: spi->max_speed_hz;

Please avoid the ternery operator; in this case the core should already
be ensuring that these parameters are configured on every transfer.

> +	/* Actually, can probably support 2-16 without any other changees */
> +	if (bits_per_word != 8 && bits_per_word != 16) {
> +		dev_err(&spi->dev, "unsupported bits_per_word %d\n",
> +			bits_per_word);
> +		return -EINVAL;
> +	}

Set bits_per_word_mask and the core will do this.

> +	} else if (spi_st->bits_per_word == 8 && !(t->len & 0x1)) {
> +		/*
> +		 * If transfer is even-length, and 8 bits-per-word, then
> +		 * implement as half-length 16 bits-per-word transfer
> +		 */
> +		spi_st->bytes_per_word = 2;
> +		spi_st->words_remaining = t->len/2;
> +
> +		/* Set SSC_CTL to 16 bits-per-word */
> +		ctl = readl_relaxed(spi_st->base + SSC_CTL);
> +		writel_relaxed((ctl | 0xf), spi_st->base + SSC_CTL);
> +
> +		readl_relaxed(spi_st->base + SSC_RBUF);

No byte swapping issues here?

> +	init_completion(&spi_st->done);

reinit_completion().

> +	/* Wait for transfer to complete */
> +	wait_for_completion(&spi_st->done);

Should have a timeout of some kind, if you use transfer_one() it'll
provide one.

> +	pm_runtime_put(spi_st->dev);

The core can do runtime PM for you.

> +	printk("LEE: %s: %s()[%d]: Probing\n", __FILE__, __func__, __LINE__);

Tsk.

> +	spi_st->clk = of_clk_get_by_name(np, "ssc");
> +	if (IS_ERR(spi_st->clk)) {
> +		dev_err(&pdev->dev, "Unable to request clock\n");
> +		ret = PTR_ERR(spi_st->clk);
> +		goto free_master;
> +	}

Why is this of_get_clk_by_name() and not just devm_clk_get()?

> +	/* Disable I2C and Reset SSC */
> +	writel_relaxed(0x0, spi_st->base + SSC_I2C);
> +	var = readw(spi_st->base + SSC_CTL);
> +	var |= SSC_CTL_SR;
> +	writel_relaxed(var, spi_st->base + SSC_CTL);
> +
> +	udelay(1);
> +	var = readl_relaxed(spi_st->base + SSC_CTL);
> +	var &= ~SSC_CTL_SR;
> +	writel_relaxed(var, spi_st->base + SSC_CTL);
> +
> +	/* Set SSC into slave mode before reconfiguring PIO pins */
> +	var = readl_relaxed(spi_st->base + SSC_CTL);
> +	var &= ~SSC_CTL_MS;
> +	writel_relaxed(var, spi_st->base + SSC_CTL);

We requested the interrupt before putting the hardware into a known good
state - it'd be safer to do things the other way around.

> +	dev_info(&pdev->dev, "registered SPI Bus %d\n", master->bus_num);

This is just noise, remove it.

> +	/* by default the device is on */
> +	pm_runtime_set_active(&pdev->dev);
> +	pm_runtime_enable(&pdev->dev);

You should do this before registering the device so that we don't get
confused about runtime PM if we start using the device immediately.

> +#ifdef CONFIG_PM_SLEEP
> +static int spi_st_suspend(struct device *dev)

> +static SIMPLE_DEV_PM_OPS(spi_st_pm, spi_st_suspend, spi_st_resume);

These look like they should be runtime PM ops too - I'd expect to at
least have the clocks disabled by runtime PM, 
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[PATCH 1/4] spi: Add new driver for STMicroelectronics' SPI Controller

[Lee Jones]

[...]

> > +struct spi_st {
> > +	/* SSC SPI Controller */
> > +	struct spi_bitbang	bitbang;
> 
> Is there a good reason for using bitbang over the core transmit_one()
> interface?  The operations are basically the same but more modern and
> the functionality is more discoverable.

I don't know enough about SPI to answer that question.  I will look
into moving over to transmit_one().  Most of the design decisions in
this driver were taken back when you were probably wearing denim
jackets and supporting an afro. ;) 


> > +	} else if (spi_st->bits_per_word == 8 && !(t->len & 0x1)) {
> > +		/*
> > +		 * If transfer is even-length, and 8 bits-per-word, then
> > +		 * implement as half-length 16 bits-per-word transfer
> > +		 */
> > +		spi_st->bytes_per_word = 2;
> > +		spi_st->words_remaining = t->len/2;
> > +
> > +		/* Set SSC_CTL to 16 bits-per-word */
> > +		ctl = readl_relaxed(spi_st->base + SSC_CTL);
> > +		writel_relaxed((ctl | 0xf), spi_st->base + SSC_CTL);
> > +
> > +		readl_relaxed(spi_st->base + SSC_RBUF);
> 
> No byte swapping issues here?

I think this implementation has been pretty heavily tested.  What
should I be looking out for?

[...]

> > +	printk("LEE: %s: %s()[%d]: Probing\n", __FILE__, __func__, __LINE__);
> 
> Tsk.

School boy error!

> > +	spi_st->clk = of_clk_get_by_name(np, "ssc");
> > +	if (IS_ERR(spi_st->clk)) {
> > +		dev_err(&pdev->dev, "Unable to request clock\n");
> > +		ret = PTR_ERR(spi_st->clk);
> > +		goto free_master;
> > +	}
> 
> Why is this of_get_clk_by_name() and not just devm_clk_get()?

Probably historical and I didn't notice.

I'll look into swapping it over.

[...]

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org ? Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

[PATCH 1/4] spi: Add new driver for STMicroelectronics' SPI Controller

[Mark Brown]

On Thu, Nov 27, 2014 at 03:05:08PM +0000, Lee Jones wrote:

> > > +		/* Set SSC_CTL to 16 bits-per-word */
> > > +		ctl = readl_relaxed(spi_st->base + SSC_CTL);
> > > +		writel_relaxed((ctl | 0xf), spi_st->base + SSC_CTL);

> > > +		readl_relaxed(spi_st->base + SSC_RBUF);

> > No byte swapping issues here?

> I think this implementation has been pretty heavily tested.  What
> should I be looking out for?

The bytes on the bus should be in exactly the same order as in memory if
the word size is 8, SPI words should be big endian normally.
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[PATCH 1/4] spi: Add new driver for STMicroelectronics' SPI Controller

[Maxime Coquelin]

On 11/27/2014 12:43 PM, Lee Jones wrote:
> This patch adds support for the SPI portion of ST's SSC device.
>
> Signed-off-by: Lee Jones <lee.jones@linaro.org>
> ---
>   drivers/spi/Kconfig  |   8 +
>   drivers/spi/Makefile |   1 +
>   drivers/spi/spi-st.c | 535 +++++++++++++++++++++++++++++++++++++++++++++++++++
>   3 files changed, 544 insertions(+)
>   create mode 100644 drivers/spi/spi-st.c
<snip>

> +
> +static int spi_st_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct device *dev = &pdev->dev;
> +	struct spi_master *master;
> +	struct resource *res;
> +	struct spi_st *spi_st;
> +	int num_cs, cs_gpio, i, ret = 0;
> +	u32 var;
> +	
> +	printk("LEE: %s: %s()[%d]: Probing\n", __FILE__, __func__, __LINE__);
> +
> +	master = spi_alloc_master(&pdev->dev, sizeof(*spi_st));
> +	if (!master) {
> +		dev_err(&pdev->dev, "failed to allocate spi master\n");
> +		return -ENOMEM;
> +	}
> +	spi_st = spi_master_get_devdata(master);
> +
> +	if (!IS_ERR(dev->pins->p)) {
> +		spi_st->pins_sleep =
> +			pinctrl_lookup_state(dev->pins->p, PINCTRL_STATE_SLEEP);
> +		if (IS_ERR(spi_st->pins_sleep))
> +			dev_warn(&pdev->dev, "could not get sleep pinstate\n");
> +	}
> +
> +	num_cs = of_gpio_named_count(np, "cs-gpios");
> +
> +	for (i = 0; i < num_cs; i++) {
> +		cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
> +
> +		if (!gpio_is_valid(cs_gpio)) {
> +			dev_err(&pdev->dev,
> +				"%d is not a valid gpio\n", cs_gpio);
> +			return -EINVAL;
> +		}
> +			
> +		if (devm_gpio_request(&pdev->dev, cs_gpio, pdev->name)) {
> +			dev_err(&pdev->dev,
> +				"could not request %d gpio\n", cs_gpio);
> +			return -EINVAL;
> +		}
> +	}
> +
> +	spi_st->clk = of_clk_get_by_name(np, "ssc");
> +	if (IS_ERR(spi_st->clk)) {
> +		dev_err(&pdev->dev, "Unable to request clock\n");
> +		ret = PTR_ERR(spi_st->clk);
> +		goto free_master;
> +	}
> +
> +	ret = clk_prepare_enable(spi_st->clk);
> +	if (ret)
> +		goto free_master;
> +
> +	master->dev.of_node		= np;
> +	master->bus_num			= pdev->id;
> +	master->mode_bits		= MODEBITS;
> +	spi_st->bitbang.master		= spi_master_get(master);
> +	spi_st->bitbang.setup_transfer	= spi_st_setup_transfer;
> +	spi_st->bitbang.txrx_bufs	= spi_st_txrx_bufs;
> +	spi_st->bitbang.master->setup	= spi_st_setup;
> +	spi_st->bitbang.master->cleanup	= spi_st_cleanup;
> +	spi_st->bitbang.chipselect	= spi_st_gpio_chipselect;
> +	spi_st->dev			= dev;
> +
> +	init_completion(&spi_st->done);
> +
> +	/* Get resources */
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	spi_st->base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(spi_st->base)) {
> +		ret = PTR_ERR(spi_st->base);
> +		goto clk_disable;
> +	}
> +
> +	spi_st->irq = irq_of_parse_and_map(np, 0);
> +	if (!spi_st->irq) {
> +		dev_err(&pdev->dev, "IRQ missing or invalid\n");
> +		ret = -EINVAL;
> +		goto clk_disable;
> +	}
> +
> +	ret = devm_request_irq(&pdev->dev, spi_st->irq, spi_st_irq, 0,
> +			       pdev->name, spi_st);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Failed to request irq %d\n", spi_st->irq);
> +		goto clk_disable;
> +	}
> +
> +	/* Disable I2C and Reset SSC */
> +	writel_relaxed(0x0, spi_st->base + SSC_I2C);
> +	var = readw(spi_st->base + SSC_CTL);
Why not readw_relaxed to be consistent with readl:s?
> +	var |= SSC_CTL_SR;
> +	writel_relaxed(var, spi_st->base + SSC_CTL);
> +
> +	udelay(1);
> +	var = readl_relaxed(spi_st->base + SSC_CTL);
> +	var &= ~SSC_CTL_SR;
> +	writel_relaxed(var, spi_st->base + SSC_CTL);
> +
> +	/* Set SSC into slave mode before reconfiguring PIO pins */
> +	var = readl_relaxed(spi_st->base + SSC_CTL);
> +	var &= ~SSC_CTL_MS;
> +	writel_relaxed(var, spi_st->base + SSC_CTL);
> +
> +	/* Start "bitbang" worker */
> +	ret = spi_bitbang_start(&spi_st->bitbang);
> +	if (ret) {
> +		dev_err(&pdev->dev, "bitbang start failed [%d]\n", ret);
> +		goto clk_disable;
> +	}
> +
> +	dev_info(&pdev->dev, "registered SPI Bus %d\n", master->bus_num);
> +
> +	platform_set_drvdata(pdev, master);

Shouldn't you call devm_spi_register_master ?
> +
> +	/* by default the device is on */
> +	pm_runtime_set_active(&pdev->dev);
> +	pm_runtime_enable(&pdev->dev);
> +
> +	return 0;
> +
> +clk_disable:
> +	clk_disable_unprepare(spi_st->clk);
> +free_master:
> +	spi_master_put(master);
> +
> +	return ret;
> +}
> +
> +static int spi_st_remove(struct platform_device *pdev)
> +{
> +	struct spi_master *master = platform_get_drvdata(pdev);
> +	struct spi_st *spi_st = spi_master_get_devdata(master);
> +
> +	spi_bitbang_stop(&spi_st->bitbang);
> +	clk_disable_unprepare(spi_st->clk);
> +
> +	if (spi_st->pins_sleep)
> +		pinctrl_select_state(pdev->dev.pins->p, spi_st->pins_sleep);
You should use pinctrl_pm_select_sleep_state(dev); instead.

> +
> +	spi_master_put(spi_st->bitbang.master);
If you use devm_spi_register_master at probe time,
you shouldn't need to call spi_master_put IIUC.

> +
> +	return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int spi_st_suspend(struct device *dev)
> +{
> +	struct spi_master *master = dev_get_drvdata(dev);
> +	struct spi_st *spi_st = spi_master_get_devdata(master);
> +
> +	writel_relaxed(0, spi_st->base + SSC_IEN);
> +
> +	if (!IS_ERR(spi_st->pins_sleep))
> +		pinctrl_select_state(dev->pins->p, spi_st->pins_sleep);
Ditto
> +
> +	clk_disable_unprepare(spi_st->clk);
> +
> +	return 0;
> +}
> +
> +static int spi_st_resume(struct device *dev)
> +{
> +	struct spi_master *master = dev_get_drvdata(dev);
> +	struct spi_st *spi_st = spi_master_get_devdata(master);
> +	int ret;
> +
> +	ret = clk_prepare_enable(spi_st->clk);
> +
> +	if (!IS_ERR(dev->pins->default_state))
> +		pinctrl_select_state(dev->pins->p, dev->pins->default_state);
     pinctrl_pm_select_default_state(i2c_dev->dev);
     pinctrl_pm_select_idle_state(i2c_dev->dev);

> +
> +	return ret;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(spi_st_pm, spi_st_suspend, spi_st_resume);
> +
> +static struct of_device_id stm_spi_match[] = {
> +	{ .compatible = "st,comms-ssc-spi", },
> +	{ .compatible = "st,comms-ssc4-spi", },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, stm_spi_match);
> +
> +static struct platform_driver spi_st_driver = {
> +	.driver = {
> +		.name = "spi-st",
> +		.pm = &spi_st_pm,
> +		.of_match_table = of_match_ptr(stm_spi_match),
> +	},
> +	.probe = spi_st_probe,
> +	.remove = spi_st_remove,
> +};
> +module_platform_driver(spi_st_driver);
> +
> +MODULE_AUTHOR("Patrice Chotard <patrice.chotard@st.com>");
> +MODULE_DESCRIPTION("STM SSC SPI driver");
> +MODULE_LICENSE("GPL v2");

[PATCH 2/4] spi: st: Provide Device Tree binding documentation

[Lee Jones]

This patch adds DT documentation for the SPI portion of ST's SSC device.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 Documentation/devicetree/bindings/spi/spi-st.txt | 40 ++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/spi-st.txt

diff --git a/Documentation/devicetree/bindings/spi/spi-st.txt b/Documentation/devicetree/bindings/spi/spi-st.txt
new file mode 100644
index 0000000..efef468e
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-st.txt
@@ -0,0 +1,40 @@
+STMicroelectronics SSC (SPI) Controller
+---------------------------------------
+
+Required properties:
+- compatible	: "st,comms-ssc-spi" or "st,comms-ssc4-spi"
+- reg		: Offset and length of the device's register set
+- interrupts	: The interrupt specifier
+- clock-names	: Must contain "ssc"
+- clocks	: Must contain an entry for each name in clock-names
+		    See ../clk/*
+- pinctrl-names	: Uses "default", can use "sleep" if provided
+		    See ../pinctrl/pinctrl-binding.txt
+
+Optional properties:
+- cs-gpios	: List of GPIO chip selects
+		    See ../spi/spi-bus.txt
+
+Child nodes represent devices on the SPI bus
+  See ../spi/spi-bus.txt
+
+Example:
+	spi at 9840000 {
+		compatible	= "st,comms-ssc-spi";
+		reg		= <0x9840000 0x110>;
+		interrupts	= <GIC_SPI 112 IRQ_TYPE_LEVEL_HIGH>;
+		clocks		= <&clk_s_c0_flexgen CLK_EXT2F_A9>;
+		clock-names	= "ssc";
+		pinctrl-0	= <&pinctrl_spi0_default>;
+		pinctrl-names	= "default";
+		cs-gpios	= <&pio17 5 0>;
+		#address-cells	= <1>;
+		#size-cells	= <0>;
+
+		st95hf at 0{
+			compatible		= "st,st95hf";
+			reg			= <0>;
+			spi-max-frequency	= <1000000>;
+			interrupts		= <2 IRQ_TYPE_EDGE_FALLING>;
+		};
+	};
-- 
1.9.1

[PATCH 2/4] spi: st: Provide Device Tree binding documentation

[Mark Brown]

On Thu, Nov 27, 2014 at 11:43:54AM +0000, Lee Jones wrote:

> +Required properties:
> +- compatible	: "st,comms-ssc-spi" or "st,comms-ssc4-spi"

What do the two different compatible strings mean (for example, should
ssc4 be used for version 4 and higher or is it just a quirk for that
version)?
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[PATCH 2/4] spi: st: Provide Device Tree binding documentation

[Lee Jones]

On Thu, 27 Nov 2014, Mark Brown wrote:

> On Thu, Nov 27, 2014 at 11:43:54AM +0000, Lee Jones wrote:
> 
> > +Required properties:
> > +- compatible	: "st,comms-ssc-spi" or "st,comms-ssc4-spi"
> 
> What do the two different compatible strings mean (for example, should
> ssc4 be used for version 4 and higher or is it just a quirk for that
> version)?

This appears to be historical.  There aren't any functional
differences i.e. we don't match on them.  I believe the former is a
more informal, generic name and the latter is the official name of the
IP block.  The I2C component already upstreamed has the same naming
conventions by the looks of it.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org ? Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

[PATCH 2/4] spi: st: Provide Device Tree binding documentation

[Mark Brown]

On Thu, Nov 27, 2014 at 02:55:42PM +0000, Lee Jones wrote:
> On Thu, 27 Nov 2014, Mark Brown wrote:

> > What do the two different compatible strings mean (for example, should
> > ssc4 be used for version 4 and higher or is it just a quirk for that
> > version)?

> This appears to be historical.  There aren't any functional
> differences i.e. we don't match on them.  I believe the former is a
> more informal, generic name and the latter is the official name of the
> IP block.  The I2C component already upstreamed has the same naming
> conventions by the looks of it.

Probably best to say something or retire one then.
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[PATCH 3/4] ARM: sti: Provide DT nodes for SSC[0..4]

[Lee Jones]

The Synchronous Serial Controller is used to provide SPI.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 arch/arm/boot/dts/stih407.dtsi | 54 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/arch/arm/boot/dts/stih407.dtsi b/arch/arm/boot/dts/stih407.dtsi
index 50637f5..245aa31 100644
--- a/arch/arm/boot/dts/stih407.dtsi
+++ b/arch/arm/boot/dts/stih407.dtsi
@@ -275,5 +275,59 @@
 
 			status = "disabled";
 		};
+
+		spi at 9840000 {
+			compatible = "st,comms-ssc-spi";
+			reg = <0x9840000 0x110>;
+			interrupts = <GIC_SPI 112 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk_s_c0_flexgen CLK_EXT2F_A9>;
+			clock-names = "ssc";
+			pinctrl-0 = <&pinctrl_spi0_default>;
+			pinctrl-names = "default";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			status = "disabled";
+		};
+
+		spi at 9841000 {
+			compatible = "st,comms-ssc-spi";
+			reg = <0x9841000 0x110>;
+			interrupts = <GIC_SPI 113 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk_s_c0_flexgen CLK_EXT2F_A9>;
+			clock-names = "ssc";
+
+			status = "disabled";
+		};
+
+		spi at 9842000 {
+			compatible = "st,comms-ssc-spi";
+			reg = <0x9842000 0x110>;
+			interrupts = <GIC_SPI 114 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk_s_c0_flexgen CLK_EXT2F_A9>;
+			clock-names = "ssc";
+
+			status = "disabled";
+		};
+
+		spi at 9843000 {
+			compatible = "st,comms-ssc-spi";
+			reg = <0x9843000 0x110>;
+			interrupts = <GIC_SPI 115 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk_s_c0_flexgen CLK_EXT2F_A9>;
+			clock-names = "ssc";
+
+			status = "disabled";
+		};
+
+		spi at 9844000 {
+			compatible = "st,comms-ssc-spi";
+			reg = <0x9844000 0x110>;
+			interrupts = <GIC_SPI 116 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk_s_c0_flexgen CLK_EXT2F_A9>;
+			clock-names = "ssc";
+
+			status = "disabled";
+		};
 	};
 };
-- 
1.9.1

[PATCH 4/4] ARM: sti: Provide DT nodes for SBC SSC[0..2]

[Lee Jones]

The Synchronous Serial Controller is used to provide SPI.

These are the ports which are located on the Stand-By Controller (SBC).

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 arch/arm/boot/dts/stih407.dtsi | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/arch/arm/boot/dts/stih407.dtsi b/arch/arm/boot/dts/stih407.dtsi
index 245aa31..cff106d 100644
--- a/arch/arm/boot/dts/stih407.dtsi
+++ b/arch/arm/boot/dts/stih407.dtsi
@@ -329,5 +329,36 @@
 
 			status = "disabled";
 		};
+
+		/* SBC SSC */
+		spi at 9540000 {
+			compatible = "st,comms-ssc-spi";
+			reg = <0x9540000 0x110>;
+			interrupts = <GIC_SPI 135 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk_sysin>;
+			clock-names = "ssc";
+
+			status = "disabled";
+		};
+
+		spi at 9541000 {
+			compatible = "st,comms-ssc-spi";
+			reg = <0x9541000 0x110>;
+			interrupts = <GIC_SPI 136 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk_sysin>;
+			clock-names = "ssc";
+
+			status = "disabled";
+		};
+
+		spi at 9542000 {
+			compatible = "st,comms-ssc-spi";
+			reg = <0x9542000 0x110>;
+			interrupts = <GIC_SPI 137 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk_sysin>;
+			clock-names = "ssc";
+
+			status = "disabled";
+		};
 	};
 };
-- 
1.9.1