summaryrefslogtreecommitdiffstats
path: root/drivers/spi/spi-orion.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/spi/spi-orion.c')
-rw-r--r--drivers/spi/spi-orion.c863
1 files changed, 863 insertions, 0 deletions
diff --git a/drivers/spi/spi-orion.c b/drivers/spi/spi-orion.c
new file mode 100644
index 0000000000..1f10f5c8e3
--- /dev/null
+++ b/drivers/spi/spi-orion.c
@@ -0,0 +1,863 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Marvell Orion SPI controller driver
+ *
+ * Author: Shadi Ammouri <shadi@marvell.com>
+ * Copyright (C) 2007-2008 Marvell Ltd.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/spi/spi.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/clk.h>
+#include <linux/sizes.h>
+#include <asm/unaligned.h>
+
+#define DRIVER_NAME "orion_spi"
+
+/* Runtime PM autosuspend timeout: PM is fairly light on this driver */
+#define SPI_AUTOSUSPEND_TIMEOUT 200
+
+/* Some SoCs using this driver support up to 8 chip selects.
+ * It is up to the implementer to only use the chip selects
+ * that are available.
+ */
+#define ORION_NUM_CHIPSELECTS 8
+
+#define ORION_SPI_WAIT_RDY_MAX_LOOP 2000 /* in usec */
+
+#define ORION_SPI_IF_CTRL_REG 0x00
+#define ORION_SPI_IF_CONFIG_REG 0x04
+#define ORION_SPI_IF_RXLSBF BIT(14)
+#define ORION_SPI_IF_TXLSBF BIT(13)
+#define ORION_SPI_DATA_OUT_REG 0x08
+#define ORION_SPI_DATA_IN_REG 0x0c
+#define ORION_SPI_INT_CAUSE_REG 0x10
+#define ORION_SPI_TIMING_PARAMS_REG 0x18
+
+/* Register for the "Direct Mode" */
+#define SPI_DIRECT_WRITE_CONFIG_REG 0x20
+
+#define ORION_SPI_TMISO_SAMPLE_MASK (0x3 << 6)
+#define ORION_SPI_TMISO_SAMPLE_1 (1 << 6)
+#define ORION_SPI_TMISO_SAMPLE_2 (2 << 6)
+
+#define ORION_SPI_MODE_CPOL (1 << 11)
+#define ORION_SPI_MODE_CPHA (1 << 12)
+#define ORION_SPI_IF_8_16_BIT_MODE (1 << 5)
+#define ORION_SPI_CLK_PRESCALE_MASK 0x1F
+#define ARMADA_SPI_CLK_PRESCALE_MASK 0xDF
+#define ORION_SPI_MODE_MASK (ORION_SPI_MODE_CPOL | \
+ ORION_SPI_MODE_CPHA)
+#define ORION_SPI_CS_MASK 0x1C
+#define ORION_SPI_CS_SHIFT 2
+#define ORION_SPI_CS(cs) ((cs << ORION_SPI_CS_SHIFT) & \
+ ORION_SPI_CS_MASK)
+
+enum orion_spi_type {
+ ORION_SPI,
+ ARMADA_SPI,
+};
+
+struct orion_spi_dev {
+ enum orion_spi_type typ;
+ /*
+ * min_divisor and max_hz should be exclusive, the only we can
+ * have both is for managing the armada-370-spi case with old
+ * device tree
+ */
+ unsigned long max_hz;
+ unsigned int min_divisor;
+ unsigned int max_divisor;
+ u32 prescale_mask;
+ bool is_errata_50mhz_ac;
+};
+
+struct orion_direct_acc {
+ void __iomem *vaddr;
+ u32 size;
+};
+
+struct orion_child_options {
+ struct orion_direct_acc direct_access;
+};
+
+struct orion_spi {
+ struct spi_controller *host;
+ void __iomem *base;
+ struct clk *clk;
+ struct clk *axi_clk;
+ const struct orion_spi_dev *devdata;
+ struct device *dev;
+
+ struct orion_child_options child[ORION_NUM_CHIPSELECTS];
+};
+
+#ifdef CONFIG_PM
+static int orion_spi_runtime_suspend(struct device *dev);
+static int orion_spi_runtime_resume(struct device *dev);
+#endif
+
+static inline void __iomem *spi_reg(struct orion_spi *orion_spi, u32 reg)
+{
+ return orion_spi->base + reg;
+}
+
+static inline void
+orion_spi_setbits(struct orion_spi *orion_spi, u32 reg, u32 mask)
+{
+ void __iomem *reg_addr = spi_reg(orion_spi, reg);
+ u32 val;
+
+ val = readl(reg_addr);
+ val |= mask;
+ writel(val, reg_addr);
+}
+
+static inline void
+orion_spi_clrbits(struct orion_spi *orion_spi, u32 reg, u32 mask)
+{
+ void __iomem *reg_addr = spi_reg(orion_spi, reg);
+ u32 val;
+
+ val = readl(reg_addr);
+ val &= ~mask;
+ writel(val, reg_addr);
+}
+
+static int orion_spi_baudrate_set(struct spi_device *spi, unsigned int speed)
+{
+ u32 tclk_hz;
+ u32 rate;
+ u32 prescale;
+ u32 reg;
+ struct orion_spi *orion_spi;
+ const struct orion_spi_dev *devdata;
+
+ orion_spi = spi_controller_get_devdata(spi->controller);
+ devdata = orion_spi->devdata;
+
+ tclk_hz = clk_get_rate(orion_spi->clk);
+
+ if (devdata->typ == ARMADA_SPI) {
+ /*
+ * Given the core_clk (tclk_hz) and the target rate (speed) we
+ * determine the best values for SPR (in [0 .. 15]) and SPPR (in
+ * [0..7]) such that
+ *
+ * core_clk / (SPR * 2 ** SPPR)
+ *
+ * is as big as possible but not bigger than speed.
+ */
+
+ /* best integer divider: */
+ unsigned divider = DIV_ROUND_UP(tclk_hz, speed);
+ unsigned spr, sppr;
+
+ if (divider < 16) {
+ /* This is the easy case, divider is less than 16 */
+ spr = divider;
+ sppr = 0;
+
+ } else {
+ unsigned two_pow_sppr;
+ /*
+ * Find the highest bit set in divider. This and the
+ * three next bits define SPR (apart from rounding).
+ * SPPR is then the number of zero bits that must be
+ * appended:
+ */
+ sppr = fls(divider) - 4;
+
+ /*
+ * As SPR only has 4 bits, we have to round divider up
+ * to the next multiple of 2 ** sppr.
+ */
+ two_pow_sppr = 1 << sppr;
+ divider = (divider + two_pow_sppr - 1) & -two_pow_sppr;
+
+ /*
+ * recalculate sppr as rounding up divider might have
+ * increased it enough to change the position of the
+ * highest set bit. In this case the bit that now
+ * doesn't make it into SPR is 0, so there is no need to
+ * round again.
+ */
+ sppr = fls(divider) - 4;
+ spr = divider >> sppr;
+
+ /*
+ * Now do range checking. SPR is constructed to have a
+ * width of 4 bits, so this is fine for sure. So we
+ * still need to check for sppr to fit into 3 bits:
+ */
+ if (sppr > 7)
+ return -EINVAL;
+ }
+
+ prescale = ((sppr & 0x6) << 5) | ((sppr & 0x1) << 4) | spr;
+ } else {
+ /*
+ * the supported rates are: 4,6,8...30
+ * round up as we look for equal or less speed
+ */
+ rate = DIV_ROUND_UP(tclk_hz, speed);
+ rate = roundup(rate, 2);
+
+ /* check if requested speed is too small */
+ if (rate > 30)
+ return -EINVAL;
+
+ if (rate < 4)
+ rate = 4;
+
+ /* Convert the rate to SPI clock divisor value. */
+ prescale = 0x10 + rate/2;
+ }
+
+ reg = readl(spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
+ reg = ((reg & ~devdata->prescale_mask) | prescale);
+ writel(reg, spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
+
+ return 0;
+}
+
+static void
+orion_spi_mode_set(struct spi_device *spi)
+{
+ u32 reg;
+ struct orion_spi *orion_spi;
+
+ orion_spi = spi_controller_get_devdata(spi->controller);
+
+ reg = readl(spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
+ reg &= ~ORION_SPI_MODE_MASK;
+ if (spi->mode & SPI_CPOL)
+ reg |= ORION_SPI_MODE_CPOL;
+ if (spi->mode & SPI_CPHA)
+ reg |= ORION_SPI_MODE_CPHA;
+ if (spi->mode & SPI_LSB_FIRST)
+ reg |= ORION_SPI_IF_RXLSBF | ORION_SPI_IF_TXLSBF;
+ else
+ reg &= ~(ORION_SPI_IF_RXLSBF | ORION_SPI_IF_TXLSBF);
+
+ writel(reg, spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
+}
+
+static void
+orion_spi_50mhz_ac_timing_erratum(struct spi_device *spi, unsigned int speed)
+{
+ u32 reg;
+ struct orion_spi *orion_spi;
+
+ orion_spi = spi_controller_get_devdata(spi->controller);
+
+ /*
+ * Erratum description: (Erratum NO. FE-9144572) The device
+ * SPI interface supports frequencies of up to 50 MHz.
+ * However, due to this erratum, when the device core clock is
+ * 250 MHz and the SPI interfaces is configured for 50MHz SPI
+ * clock and CPOL=CPHA=1 there might occur data corruption on
+ * reads from the SPI device.
+ * Erratum Workaround:
+ * Work in one of the following configurations:
+ * 1. Set CPOL=CPHA=0 in "SPI Interface Configuration
+ * Register".
+ * 2. Set TMISO_SAMPLE value to 0x2 in "SPI Timing Parameters 1
+ * Register" before setting the interface.
+ */
+ reg = readl(spi_reg(orion_spi, ORION_SPI_TIMING_PARAMS_REG));
+ reg &= ~ORION_SPI_TMISO_SAMPLE_MASK;
+
+ if (clk_get_rate(orion_spi->clk) == 250000000 &&
+ speed == 50000000 && spi->mode & SPI_CPOL &&
+ spi->mode & SPI_CPHA)
+ reg |= ORION_SPI_TMISO_SAMPLE_2;
+ else
+ reg |= ORION_SPI_TMISO_SAMPLE_1; /* This is the default value */
+
+ writel(reg, spi_reg(orion_spi, ORION_SPI_TIMING_PARAMS_REG));
+}
+
+/*
+ * called only when no transfer is active on the bus
+ */
+static int
+orion_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
+{
+ struct orion_spi *orion_spi;
+ unsigned int speed = spi->max_speed_hz;
+ unsigned int bits_per_word = spi->bits_per_word;
+ int rc;
+
+ orion_spi = spi_controller_get_devdata(spi->controller);
+
+ if ((t != NULL) && t->speed_hz)
+ speed = t->speed_hz;
+
+ if ((t != NULL) && t->bits_per_word)
+ bits_per_word = t->bits_per_word;
+
+ orion_spi_mode_set(spi);
+
+ if (orion_spi->devdata->is_errata_50mhz_ac)
+ orion_spi_50mhz_ac_timing_erratum(spi, speed);
+
+ rc = orion_spi_baudrate_set(spi, speed);
+ if (rc)
+ return rc;
+
+ if (bits_per_word == 16)
+ orion_spi_setbits(orion_spi, ORION_SPI_IF_CONFIG_REG,
+ ORION_SPI_IF_8_16_BIT_MODE);
+ else
+ orion_spi_clrbits(orion_spi, ORION_SPI_IF_CONFIG_REG,
+ ORION_SPI_IF_8_16_BIT_MODE);
+
+ return 0;
+}
+
+static void orion_spi_set_cs(struct spi_device *spi, bool enable)
+{
+ struct orion_spi *orion_spi;
+ void __iomem *ctrl_reg;
+ u32 val;
+
+ orion_spi = spi_controller_get_devdata(spi->controller);
+ ctrl_reg = spi_reg(orion_spi, ORION_SPI_IF_CTRL_REG);
+
+ val = readl(ctrl_reg);
+
+ /* Clear existing chip-select and assertion state */
+ val &= ~(ORION_SPI_CS_MASK | 0x1);
+
+ /*
+ * If this line is using a GPIO to control chip select, this internal
+ * .set_cs() function will still be called, so we clear any previous
+ * chip select. The CS we activate will not have any elecrical effect,
+ * as it is handled by a GPIO, but that doesn't matter. What we need
+ * is to deassert the old chip select and assert some other chip select.
+ */
+ val |= ORION_SPI_CS(spi_get_chipselect(spi, 0));
+
+ /*
+ * Chip select logic is inverted from spi_set_cs(). For lines using a
+ * GPIO to do chip select SPI_CS_HIGH is enforced and inversion happens
+ * in the GPIO library, but we don't care about that, because in those
+ * cases we are dealing with an unused native CS anyways so the polarity
+ * doesn't matter.
+ */
+ if (!enable)
+ val |= 0x1;
+
+ /*
+ * To avoid toggling unwanted chip selects update the register
+ * with a single write.
+ */
+ writel(val, ctrl_reg);
+}
+
+static inline int orion_spi_wait_till_ready(struct orion_spi *orion_spi)
+{
+ int i;
+
+ for (i = 0; i < ORION_SPI_WAIT_RDY_MAX_LOOP; i++) {
+ if (readl(spi_reg(orion_spi, ORION_SPI_INT_CAUSE_REG)))
+ return 1;
+
+ udelay(1);
+ }
+
+ return -1;
+}
+
+static inline int
+orion_spi_write_read_8bit(struct spi_device *spi,
+ const u8 **tx_buf, u8 **rx_buf)
+{
+ void __iomem *tx_reg, *rx_reg, *int_reg;
+ struct orion_spi *orion_spi;
+ bool cs_single_byte;
+
+ cs_single_byte = spi->mode & SPI_CS_WORD;
+
+ orion_spi = spi_controller_get_devdata(spi->controller);
+
+ if (cs_single_byte)
+ orion_spi_set_cs(spi, 0);
+
+ tx_reg = spi_reg(orion_spi, ORION_SPI_DATA_OUT_REG);
+ rx_reg = spi_reg(orion_spi, ORION_SPI_DATA_IN_REG);
+ int_reg = spi_reg(orion_spi, ORION_SPI_INT_CAUSE_REG);
+
+ /* clear the interrupt cause register */
+ writel(0x0, int_reg);
+
+ if (tx_buf && *tx_buf)
+ writel(*(*tx_buf)++, tx_reg);
+ else
+ writel(0, tx_reg);
+
+ if (orion_spi_wait_till_ready(orion_spi) < 0) {
+ if (cs_single_byte) {
+ orion_spi_set_cs(spi, 1);
+ /* Satisfy some SLIC devices requirements */
+ udelay(4);
+ }
+ dev_err(&spi->dev, "TXS timed out\n");
+ return -1;
+ }
+
+ if (rx_buf && *rx_buf)
+ *(*rx_buf)++ = readl(rx_reg);
+
+ if (cs_single_byte) {
+ orion_spi_set_cs(spi, 1);
+ /* Satisfy some SLIC devices requirements */
+ udelay(4);
+ }
+
+ return 1;
+}
+
+static inline int
+orion_spi_write_read_16bit(struct spi_device *spi,
+ const u16 **tx_buf, u16 **rx_buf)
+{
+ void __iomem *tx_reg, *rx_reg, *int_reg;
+ struct orion_spi *orion_spi;
+
+ if (spi->mode & SPI_CS_WORD) {
+ dev_err(&spi->dev, "SPI_CS_WORD is only supported for 8 bit words\n");
+ return -1;
+ }
+
+ orion_spi = spi_controller_get_devdata(spi->controller);
+ tx_reg = spi_reg(orion_spi, ORION_SPI_DATA_OUT_REG);
+ rx_reg = spi_reg(orion_spi, ORION_SPI_DATA_IN_REG);
+ int_reg = spi_reg(orion_spi, ORION_SPI_INT_CAUSE_REG);
+
+ /* clear the interrupt cause register */
+ writel(0x0, int_reg);
+
+ if (tx_buf && *tx_buf)
+ writel(__cpu_to_le16(get_unaligned((*tx_buf)++)), tx_reg);
+ else
+ writel(0, tx_reg);
+
+ if (orion_spi_wait_till_ready(orion_spi) < 0) {
+ dev_err(&spi->dev, "TXS timed out\n");
+ return -1;
+ }
+
+ if (rx_buf && *rx_buf)
+ put_unaligned(__le16_to_cpu(readl(rx_reg)), (*rx_buf)++);
+
+ return 1;
+}
+
+static unsigned int
+orion_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer)
+{
+ unsigned int count;
+ int word_len;
+ struct orion_spi *orion_spi;
+ int cs = spi_get_chipselect(spi, 0);
+ void __iomem *vaddr;
+
+ word_len = spi->bits_per_word;
+ count = xfer->len;
+
+ orion_spi = spi_controller_get_devdata(spi->controller);
+
+ /*
+ * Use SPI direct write mode if base address is available
+ * and SPI_CS_WORD flag is not set.
+ * Otherwise fall back to PIO mode for this transfer.
+ */
+ vaddr = orion_spi->child[cs].direct_access.vaddr;
+
+ if (vaddr && xfer->tx_buf && word_len == 8 && (spi->mode & SPI_CS_WORD) == 0) {
+ unsigned int cnt = count / 4;
+ unsigned int rem = count % 4;
+
+ /*
+ * Send the TX-data to the SPI device via the direct
+ * mapped address window
+ */
+ iowrite32_rep(vaddr, xfer->tx_buf, cnt);
+ if (rem) {
+ u32 *buf = (u32 *)xfer->tx_buf;
+
+ iowrite8_rep(vaddr, &buf[cnt], rem);
+ }
+
+ return count;
+ }
+
+ if (word_len == 8) {
+ const u8 *tx = xfer->tx_buf;
+ u8 *rx = xfer->rx_buf;
+
+ do {
+ if (orion_spi_write_read_8bit(spi, &tx, &rx) < 0)
+ goto out;
+ count--;
+ spi_delay_exec(&xfer->word_delay, xfer);
+ } while (count);
+ } else if (word_len == 16) {
+ const u16 *tx = xfer->tx_buf;
+ u16 *rx = xfer->rx_buf;
+
+ do {
+ if (orion_spi_write_read_16bit(spi, &tx, &rx) < 0)
+ goto out;
+ count -= 2;
+ spi_delay_exec(&xfer->word_delay, xfer);
+ } while (count);
+ }
+
+out:
+ return xfer->len - count;
+}
+
+static int orion_spi_transfer_one(struct spi_controller *host,
+ struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ int status = 0;
+
+ status = orion_spi_setup_transfer(spi, t);
+ if (status < 0)
+ return status;
+
+ if (t->len)
+ orion_spi_write_read(spi, t);
+
+ return status;
+}
+
+static int orion_spi_setup(struct spi_device *spi)
+{
+ int ret;
+#ifdef CONFIG_PM
+ struct orion_spi *orion_spi = spi_controller_get_devdata(spi->controller);
+ struct device *dev = orion_spi->dev;
+
+ orion_spi_runtime_resume(dev);
+#endif
+
+ ret = orion_spi_setup_transfer(spi, NULL);
+
+#ifdef CONFIG_PM
+ orion_spi_runtime_suspend(dev);
+#endif
+
+ return ret;
+}
+
+static int orion_spi_reset(struct orion_spi *orion_spi)
+{
+ /* Verify that the CS is deasserted */
+ orion_spi_clrbits(orion_spi, ORION_SPI_IF_CTRL_REG, 0x1);
+
+ /* Don't deassert CS between the direct mapped SPI transfers */
+ writel(0, spi_reg(orion_spi, SPI_DIRECT_WRITE_CONFIG_REG));
+
+ return 0;
+}
+
+static const struct orion_spi_dev orion_spi_dev_data = {
+ .typ = ORION_SPI,
+ .min_divisor = 4,
+ .max_divisor = 30,
+ .prescale_mask = ORION_SPI_CLK_PRESCALE_MASK,
+};
+
+static const struct orion_spi_dev armada_370_spi_dev_data = {
+ .typ = ARMADA_SPI,
+ .min_divisor = 4,
+ .max_divisor = 1920,
+ .max_hz = 50000000,
+ .prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK,
+};
+
+static const struct orion_spi_dev armada_xp_spi_dev_data = {
+ .typ = ARMADA_SPI,
+ .max_hz = 50000000,
+ .max_divisor = 1920,
+ .prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK,
+};
+
+static const struct orion_spi_dev armada_375_spi_dev_data = {
+ .typ = ARMADA_SPI,
+ .min_divisor = 15,
+ .max_divisor = 1920,
+ .prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK,
+};
+
+static const struct orion_spi_dev armada_380_spi_dev_data = {
+ .typ = ARMADA_SPI,
+ .max_hz = 50000000,
+ .max_divisor = 1920,
+ .prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK,
+ .is_errata_50mhz_ac = true,
+};
+
+static const struct of_device_id orion_spi_of_match_table[] = {
+ {
+ .compatible = "marvell,orion-spi",
+ .data = &orion_spi_dev_data,
+ },
+ {
+ .compatible = "marvell,armada-370-spi",
+ .data = &armada_370_spi_dev_data,
+ },
+ {
+ .compatible = "marvell,armada-375-spi",
+ .data = &armada_375_spi_dev_data,
+ },
+ {
+ .compatible = "marvell,armada-380-spi",
+ .data = &armada_380_spi_dev_data,
+ },
+ {
+ .compatible = "marvell,armada-390-spi",
+ .data = &armada_xp_spi_dev_data,
+ },
+ {
+ .compatible = "marvell,armada-xp-spi",
+ .data = &armada_xp_spi_dev_data,
+ },
+
+ {}
+};
+MODULE_DEVICE_TABLE(of, orion_spi_of_match_table);
+
+static int orion_spi_probe(struct platform_device *pdev)
+{
+ const struct orion_spi_dev *devdata;
+ struct spi_controller *host;
+ struct orion_spi *spi;
+ struct resource *r;
+ unsigned long tclk_hz;
+ int status = 0;
+ struct device_node *np;
+
+ host = spi_alloc_host(&pdev->dev, sizeof(*spi));
+ if (host == NULL) {
+ dev_dbg(&pdev->dev, "host allocation failed\n");
+ return -ENOMEM;
+ }
+
+ if (pdev->id != -1)
+ host->bus_num = pdev->id;
+ if (pdev->dev.of_node) {
+ u32 cell_index;
+
+ if (!of_property_read_u32(pdev->dev.of_node, "cell-index",
+ &cell_index))
+ host->bus_num = cell_index;
+ }
+
+ /* we support all 4 SPI modes and LSB first option */
+ host->mode_bits = SPI_CPHA | SPI_CPOL | SPI_LSB_FIRST | SPI_CS_WORD;
+ host->set_cs = orion_spi_set_cs;
+ host->transfer_one = orion_spi_transfer_one;
+ host->num_chipselect = ORION_NUM_CHIPSELECTS;
+ host->setup = orion_spi_setup;
+ host->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
+ host->auto_runtime_pm = true;
+ host->use_gpio_descriptors = true;
+ host->flags = SPI_CONTROLLER_GPIO_SS;
+
+ platform_set_drvdata(pdev, host);
+
+ spi = spi_controller_get_devdata(host);
+ spi->host = host;
+ spi->dev = &pdev->dev;
+
+ devdata = device_get_match_data(&pdev->dev);
+ devdata = devdata ? devdata : &orion_spi_dev_data;
+ spi->devdata = devdata;
+
+ spi->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(spi->clk)) {
+ status = PTR_ERR(spi->clk);
+ goto out;
+ }
+
+ status = clk_prepare_enable(spi->clk);
+ if (status)
+ goto out;
+
+ /* The following clock is only used by some SoCs */
+ spi->axi_clk = devm_clk_get(&pdev->dev, "axi");
+ if (PTR_ERR(spi->axi_clk) == -EPROBE_DEFER) {
+ status = -EPROBE_DEFER;
+ goto out_rel_clk;
+ }
+ if (!IS_ERR(spi->axi_clk))
+ clk_prepare_enable(spi->axi_clk);
+
+ tclk_hz = clk_get_rate(spi->clk);
+
+ /*
+ * With old device tree, armada-370-spi could be used with
+ * Armada XP, however for this SoC the maximum frequency is
+ * 50MHz instead of tclk/4. On Armada 370, tclk cannot be
+ * higher than 200MHz. So, in order to be able to handle both
+ * SoCs, we can take the minimum of 50MHz and tclk/4.
+ */
+ if (of_device_is_compatible(pdev->dev.of_node,
+ "marvell,armada-370-spi"))
+ host->max_speed_hz = min(devdata->max_hz,
+ DIV_ROUND_UP(tclk_hz, devdata->min_divisor));
+ else if (devdata->min_divisor)
+ host->max_speed_hz =
+ DIV_ROUND_UP(tclk_hz, devdata->min_divisor);
+ else
+ host->max_speed_hz = devdata->max_hz;
+ host->min_speed_hz = DIV_ROUND_UP(tclk_hz, devdata->max_divisor);
+
+ spi->base = devm_platform_get_and_ioremap_resource(pdev, 0, &r);
+ if (IS_ERR(spi->base)) {
+ status = PTR_ERR(spi->base);
+ goto out_rel_axi_clk;
+ }
+
+ for_each_available_child_of_node(pdev->dev.of_node, np) {
+ struct orion_direct_acc *dir_acc;
+ u32 cs;
+
+ /* Get chip-select number from the "reg" property */
+ status = of_property_read_u32(np, "reg", &cs);
+ if (status) {
+ dev_err(&pdev->dev,
+ "%pOF has no valid 'reg' property (%d)\n",
+ np, status);
+ continue;
+ }
+
+ /*
+ * Check if an address is configured for this SPI device. If
+ * not, the MBus mapping via the 'ranges' property in the 'soc'
+ * node is not configured and this device should not use the
+ * direct mode. In this case, just continue with the next
+ * device.
+ */
+ status = of_address_to_resource(pdev->dev.of_node, cs + 1, r);
+ if (status)
+ continue;
+
+ /*
+ * Only map one page for direct access. This is enough for the
+ * simple TX transfer which only writes to the first word.
+ * This needs to get extended for the direct SPI NOR / SPI NAND
+ * support, once this gets implemented.
+ */
+ dir_acc = &spi->child[cs].direct_access;
+ dir_acc->vaddr = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE);
+ if (!dir_acc->vaddr) {
+ status = -ENOMEM;
+ of_node_put(np);
+ goto out_rel_axi_clk;
+ }
+ dir_acc->size = PAGE_SIZE;
+
+ dev_info(&pdev->dev, "CS%d configured for direct access\n", cs);
+ }
+
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
+ pm_runtime_enable(&pdev->dev);
+
+ status = orion_spi_reset(spi);
+ if (status < 0)
+ goto out_rel_pm;
+
+ host->dev.of_node = pdev->dev.of_node;
+ status = spi_register_controller(host);
+ if (status < 0)
+ goto out_rel_pm;
+
+ return status;
+
+out_rel_pm:
+ pm_runtime_disable(&pdev->dev);
+out_rel_axi_clk:
+ clk_disable_unprepare(spi->axi_clk);
+out_rel_clk:
+ clk_disable_unprepare(spi->clk);
+out:
+ spi_controller_put(host);
+ return status;
+}
+
+
+static void orion_spi_remove(struct platform_device *pdev)
+{
+ struct spi_controller *host = platform_get_drvdata(pdev);
+ struct orion_spi *spi = spi_controller_get_devdata(host);
+
+ pm_runtime_get_sync(&pdev->dev);
+ clk_disable_unprepare(spi->axi_clk);
+ clk_disable_unprepare(spi->clk);
+
+ spi_unregister_controller(host);
+ pm_runtime_disable(&pdev->dev);
+}
+
+MODULE_ALIAS("platform:" DRIVER_NAME);
+
+#ifdef CONFIG_PM
+static int orion_spi_runtime_suspend(struct device *dev)
+{
+ struct spi_controller *host = dev_get_drvdata(dev);
+ struct orion_spi *spi = spi_controller_get_devdata(host);
+
+ clk_disable_unprepare(spi->axi_clk);
+ clk_disable_unprepare(spi->clk);
+ return 0;
+}
+
+static int orion_spi_runtime_resume(struct device *dev)
+{
+ struct spi_controller *host = dev_get_drvdata(dev);
+ struct orion_spi *spi = spi_controller_get_devdata(host);
+
+ if (!IS_ERR(spi->axi_clk))
+ clk_prepare_enable(spi->axi_clk);
+ return clk_prepare_enable(spi->clk);
+}
+#endif
+
+static const struct dev_pm_ops orion_spi_pm_ops = {
+ SET_RUNTIME_PM_OPS(orion_spi_runtime_suspend,
+ orion_spi_runtime_resume,
+ NULL)
+};
+
+static struct platform_driver orion_spi_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .pm = &orion_spi_pm_ops,
+ .of_match_table = of_match_ptr(orion_spi_of_match_table),
+ },
+ .probe = orion_spi_probe,
+ .remove_new = orion_spi_remove,
+};
+
+module_platform_driver(orion_spi_driver);
+
+MODULE_DESCRIPTION("Orion SPI driver");
+MODULE_AUTHOR("Shadi Ammouri <shadi@marvell.com>");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-25 22:43:33 +0000