From: Jassi Brar <jaswinder.singh@xxxxxxxxxx>
This patch adds support for controller found on synquacer platforms.
Signed-off-by: Jassi Brar <jaswinder.singh@xxxxxxxxxx>
---
drivers/spi/Kconfig | 11 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-synquacer.c | 661 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 673 insertions(+)
create mode 100644 drivers/spi/spi-synquacer.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 6037839..9e04bbe 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -659,6 +659,17 @@ config SPI_SUN6I
help
This enables using the SPI controller on the Allwinner A31 SoCs.
+config SPI_SYNQUACER
+ tristate "Socionext's Synquacer HighSpeed SPI controller"
+ depends on ARCH_SYNQUACER || COMPILE_TEST
+ select SPI_BITBANG
+ help
+ SPI driver for Socionext's High speed SPI controller which provides
+ various operating modes for interfacing to serial peripheral devices
+ that use the de-facto standard SPI protocol.
+
+ It also supports the new dual-bit and quad-bit SPI protocol.
+
config SPI_MXS
tristate "Freescale MXS SPI controller"
depends on ARCH_MXS
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 34c5f28..7c222f2 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -96,6 +96,7 @@ obj-$(CONFIG_SPI_STM32) += spi-stm32.o
obj-$(CONFIG_SPI_ST_SSC4) += spi-st-ssc4.o
obj-$(CONFIG_SPI_SUN4I) += spi-sun4i.o
obj-$(CONFIG_SPI_SUN6I) += spi-sun6i.o
+obj-$(CONFIG_SPI_SYNQUACER) += spi-synquacer.o
obj-$(CONFIG_SPI_TEGRA114) += spi-tegra114.o
obj-$(CONFIG_SPI_TEGRA20_SFLASH) += spi-tegra20-sflash.o
obj-$(CONFIG_SPI_TEGRA20_SLINK) += spi-tegra20-slink.o
diff --git a/drivers/spi/spi-synquacer.c b/drivers/spi/spi-synquacer.c
new file mode 100644
index 0000000..15568b1
--- /dev/null
+++ b/drivers/spi/spi-synquacer.c
@@ -0,0 +1,661 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Synquacer HSSPI controller driver
+//
+// Copyright (c) 2015-2018 Socionext Inc.
+// Copyright (c) 2018 Linaro Ltd.
+//
+
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+#include <linux/spinlock.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+
+#define MCTRL 0x0
+#define MEN BIT(0)
+#define CSEN BIT(1)
+#define BPCLK BIT(3)
+#define MES BIT(4)
+#define SYNCON BIT(5)
+
+#define PCC0 0x4
+#define PCC(n) (PCC0 + (n) * 4)
+#define RTM BIT(3)
+#define ACES BIT(2)
+#define SAFESYNC BIT(16)
+#define CPHA BIT(0)
+#define CPOL BIT(1)
+#define SSPOL BIT(4)
+#define SDIR BIT(7)
+#define SS2CD 5
+#define SENDIAN BIT(8)
+#define CDRS_SHIFT 9
+#define CDRS_MASK 0x7f
+
+#define TXF 0x14
+#define TXE 0x18
+#define TXC 0x1c
+#define RXF 0x20
+#define RXE 0x24
+#define RXC 0x28
+
+#define FAULTF 0x2c
+#define FAULTC 0x30
+
+#define DMCFG 0x34
+#define SSDC BIT(1)
+#define MSTARTEN BIT(2)
+
+#define DMSTART 0x38
+#define TRIGGER BIT(0)
+#define DMSTOP BIT(8)
+#define CS_MASK 3
+#define CS_SHIFT 16
+#define DATA_TXRX 0
+#define DATA_RX 1
+#define DATA_TX 2
+#define DATA_MASK 3
+#define DATA_SHIFT 26
+#define BUS_WIDTH 24
+
+#define DMBCC 0x3c
+#define DMSTATUS 0x40
+#define RX_DATA_MASK 0x1f
+#define RX_DATA_SHIFT 8
+#define TX_DATA_MASK 0x1f
+#define TX_DATA_SHIFT 16
+
+#define TXBITCNT 0x44
+
+#define FIFOCFG 0x4c
+#define BPW_MASK 0x3
+#define BPW_SHIFT 8
+#define RX_FLUSH BIT(11)
+#define TX_FLUSH BIT(12)
+#define RX_TRSHLD_MASK 0xf
+#define RX_TRSHLD_SHIFT 0
+#define TX_TRSHLD_MASK 0xf
+#define TX_TRSHLD_SHIFT 4
+
+#define TXFIFO 0x50
+#define RXFIFO 0x90
+#define MID 0xfc
+
+#define FIFO_DEPTH 16
+#define TX_TRSHLD 4
+#define RX_TRSHLD (FIFO_DEPTH - TX_TRSHLD)
+
+#define TXBIT BIT(1)
+#define RXBIT BIT(2)
+
+#define IHCLK 0
+#define IPCLK 1
+
+struct synquacer_spi {
+ struct device *dev;
+ struct spi_master *master;
+
+ unsigned int cs;
+ unsigned int bpw;
+ unsigned int mode;
+ unsigned int speed;
+ bool aces, rtm;
+ void *rx_buf;
+ const void *tx_buf;
+ struct clk *clk[2];
+ void __iomem *regs;
+ unsigned int tx_words, rx_words;
+ unsigned int bus_width;
+};
+
+static void read_fifo(struct synquacer_spi *sspi)
+{
+ u32 len = readl_relaxed(sspi->regs + DMSTATUS);
+ int i;
+
+ len = (len >> RX_DATA_SHIFT) & RX_DATA_MASK;
+ len = min_t(unsigned int, len, sspi->rx_words);
+
+ switch (sspi->bpw) {
+ case 8:
+ {
+ u8 *buf = sspi->rx_buf;
+
+ for (i = 0; i < len; i++)
+ *buf++ = readb_relaxed(sspi->regs + RXFIFO);
+ sspi->rx_buf = buf;
+ break;
+ }
+ case 16:
+ {
+ u16 *buf = sspi->rx_buf;
+
+ for (i = 0; i < len; i++)
+ *buf++ = readw_relaxed(sspi->regs + RXFIFO);
+ sspi->rx_buf = buf;
+ break;
+ }
+ default:
+ {
+ u32 *buf = sspi->rx_buf;
+
+ for (i = 0; i < len; i++)
+ *buf++ = readl_relaxed(sspi->regs + RXFIFO);
+ sspi->rx_buf = buf;
+ break;
+ }
+ }
+
+ sspi->rx_words -= len;
+}
+
+static void write_fifo(struct synquacer_spi *sspi)
+{
+ u32 len = readl_relaxed(sspi->regs + DMSTATUS);
+ int i;
+
+ len = (len >> TX_DATA_SHIFT) & TX_DATA_MASK;
+ len = min_t(unsigned int, FIFO_DEPTH - len, sspi->tx_words);
+
+ switch (sspi->bpw) {
+ case 8:
+ {
+ const u8 *buf = sspi->tx_buf;
+
+ for (i = 0; i < len; i++)
+ writeb_relaxed(*buf++, sspi->regs + TXFIFO);
+ sspi->tx_buf = buf;
+ break;
+ }
+ case 16:
+ {
+ const u16 *buf = sspi->tx_buf;
+
+ for (i = 0; i < len; i++)
+ writew_relaxed(*buf++, sspi->regs + TXFIFO);
+ sspi->tx_buf = buf;
+ break;
+ }
+ default:
+ {
+ const u32 *buf = sspi->tx_buf;
+
+ for (i = 0; i < len; i++)
+ writel_relaxed(*buf++, sspi->regs + TXFIFO);
+ sspi->tx_buf = buf;
+ break;
+ }
+ }
+ sspi->tx_words -= len;
+}
+
+static int synquacer_spi_config(struct spi_master *master,
+ struct spi_device *spi,
+ struct spi_transfer *xfer)
+{
+ struct synquacer_spi *sspi = spi_master_get_devdata(master);
+ unsigned int speed, mode, bpw, cs, bus_width;
+ unsigned long rate;
+ u32 val, div;
+
+ /* Full Duplex only on 1bit wide bus */
+ if (xfer->rx_buf && xfer->tx_buf &&
+ (xfer->rx_nbits != 1 || xfer->tx_nbits != 1)) {
+ dev_err(sspi->dev,
+ "RX and TX bus widths must match for Full-Duplex!\n");
+ return -EINVAL;
+ }
+
+ if (xfer->tx_buf)
+ bus_width = xfer->tx_nbits;
+ else
+ bus_width = xfer->rx_nbits;
+
+ mode = spi->mode;
+ cs = spi->chip_select;
+ speed = xfer->speed_hz;
+ bpw = xfer->bits_per_word;
+
+ /* return if nothing to change */
+ if (speed == sspi->speed &&
+ bus_width == sspi->bus_width && bpw == sspi->bpw &&
+ mode == sspi->mode && cs == sspi->cs) {
+ return 0;
+ }
+
+ rate = master->max_speed_hz;
+
+ div = DIV_ROUND_UP(rate, speed);
+ if (div > 254) {
+ dev_err(sspi->dev, "Requested rate too low (%u)\n",
+ sspi->speed);
+ return -EINVAL;
+ }
+
+ val = readl_relaxed(sspi->regs + PCC(cs));
+ val &= ~SAFESYNC;
+ if (bpw == 8 && (mode & (SPI_TX_DUAL | SPI_RX_DUAL)) && div < 3)
+ val |= SAFESYNC;
+ if (bpw == 8 && (mode & (SPI_TX_QUAD | SPI_RX_QUAD)) && div < 6)
+ val |= SAFESYNC;
+ if (bpw == 16 && (mode & (SPI_TX_QUAD | SPI_RX_QUAD)) && div < 3)
+ val |= SAFESYNC;
+
+ if (mode & SPI_CPHA)
+ val |= CPHA;
+ else
+ val &= ~CPHA;
+
+ if (mode & SPI_CPOL)
+ val |= CPOL;
+ else
+ val &= ~CPOL;
+
+ if (mode & SPI_CS_HIGH)
+ val |= SSPOL;
+ else
+ val &= ~SSPOL;
+
+ if (mode & SPI_LSB_FIRST)
+ val |= SDIR;
+ else
+ val &= ~SDIR;
+
+ if (sspi->aces)
+ val |= ACES;
+ else
+ val &= ~ACES;
+
+ if (sspi->rtm)
+ val |= RTM;
+ else
+ val &= ~RTM;
+
+ val |= (3 << SS2CD);
+ val |= SENDIAN;
+
+ val &= ~(CDRS_MASK << CDRS_SHIFT);
+ val |= ((div >> 1) << CDRS_SHIFT);
+
+ writel_relaxed(val, sspi->regs + PCC(cs));
+
+ val = readl_relaxed(sspi->regs + FIFOCFG);
+ val &= ~(BPW_MASK << BPW_SHIFT);
+ val |= ((bpw / 8 - 1) << BPW_SHIFT);
+ writel_relaxed(val, sspi->regs + FIFOCFG);
+
+ val = readl_relaxed(sspi->regs + DMSTART);
+ val &= ~(DATA_MASK << DATA_SHIFT);
+
+ if (xfer->tx_buf && xfer->rx_buf)
+ val |= (DATA_TXRX << DATA_SHIFT);
+ else if (xfer->rx_buf)
+ val |= (DATA_RX << DATA_SHIFT);
+ else
+ val |= (DATA_TX << DATA_SHIFT);
+
+ val &= ~(3 << BUS_WIDTH);
+ val |= ((bus_width >> 1) << BUS_WIDTH);
+ writel_relaxed(val, sspi->regs + DMSTART);
+
+ sspi->bpw = bpw;
+ sspi->mode = mode;
+ sspi->speed = speed;
+ sspi->cs = spi->chip_select;
+ sspi->bus_width = bus_width;
+
+ return 0;
+}
+
+static int synquacer_spi_transfer_one(struct spi_master *master,
+ struct spi_device *spi,
+ struct spi_transfer *xfer)
+{
+ struct synquacer_spi *sspi = spi_master_get_devdata(master);
+ int ret, words, busy = 0;
+ unsigned long bpw;
+ u32 val;
+
+ val = readl_relaxed(sspi->regs + FIFOCFG);
+ val |= RX_FLUSH;
+ val |= TX_FLUSH;
+ writel_relaxed(val, sspi->regs + FIFOCFG);
+
+ /* See if we can transfer 4-bytes as 1 word even if not asked */
+ bpw = xfer->bits_per_word;
+ if (bpw == 8 && !(xfer->len % 4) && !(spi->mode & SPI_LSB_FIRST))
+ xfer->bits_per_word = 32;
+
+ ret = synquacer_spi_config(master, spi, xfer);
+
+ /* restore */
+ xfer->bits_per_word = bpw;
+
+ if (ret)
+ return ret;
+
+ sspi->tx_buf = xfer->tx_buf;
+ sspi->rx_buf = xfer->rx_buf;
+
+ switch (sspi->bpw) {
+ case 8:
+ words = xfer->len;
+ break;
+ case 16:
+ words = xfer->len / 2;
+ break;
+ default:
+ words = xfer->len / 4;
+ break;
+ }
+
+ if (xfer->tx_buf) {
+ busy |= TXBIT;
+ sspi->tx_words = words;
+ } else {
+ sspi->tx_words = 0;
+ }
+
+ if (xfer->rx_buf) {
+ busy |= RXBIT;
+ sspi->rx_words = words;
+ } else {
+ sspi->rx_words = 0;
+ }
+
+ if (xfer->tx_buf)
+ write_fifo(sspi);
+
+ if (xfer->rx_buf) {
+ val = readl_relaxed(sspi->regs + FIFOCFG);
+ val &= ~(RX_TRSHLD_MASK << RX_TRSHLD_SHIFT);
+ val |= ((sspi->rx_words > FIFO_DEPTH ?
+ RX_TRSHLD : sspi->rx_words) << RX_TRSHLD_SHIFT);
+ writel_relaxed(val, sspi->regs + FIFOCFG);
+ }
+
+ writel_relaxed(~0, sspi->regs + TXC);
+ writel_relaxed(~0, sspi->regs + RXC);
+
+ /* Trigger */
+ val = readl_relaxed(sspi->regs + DMSTART);
+ val |= TRIGGER;
+ writel_relaxed(val, sspi->regs + DMSTART);
+
+ while (busy & (RXBIT | TXBIT)) {
+ if (sspi->rx_words)
+ read_fifo(sspi);
+ else
+ busy &= ~RXBIT;
+
+ if (sspi->tx_words) {
+ write_fifo(sspi);
+ } else {
+ u32 len;
+
+ do { /* wait for shifter to empty out */
+ cpu_relax();
+ len = readl_relaxed(sspi->regs + DMSTATUS);
+ len = (len >> TX_DATA_SHIFT) & TX_DATA_MASK;
+ } while (xfer->tx_buf && len);
+ busy &= ~TXBIT;
+ }
+ }
+
+ return 0;
+}
+
+static void synquacer_spi_set_cs(struct spi_device *spi, bool enable)
+{
+ struct synquacer_spi *sspi = spi_master_get_devdata(spi->master);
+ u32 val;
+
+ val = readl_relaxed(sspi->regs + DMSTART);
+ val &= ~(CS_MASK << CS_SHIFT);
+ val |= spi->chip_select << CS_SHIFT;
+
+ if (!enable) {
+ writel_relaxed(val, sspi->regs + DMSTART);
+
+ val = readl_relaxed(sspi->regs + DMSTART);
+ val &= ~DMSTOP;
+ writel_relaxed(val, sspi->regs + DMSTART);
+ } else {
+ val |= DMSTOP;
+ writel_relaxed(val, sspi->regs + DMSTART);
+
+ if (sspi->rx_buf) {
+ u32 buf[16];
+
+ sspi->rx_buf = buf;
+ sspi->rx_words = 16;
+ read_fifo(sspi);
+ }
+ }
+}
+
+static int synquacer_spi_enable(struct spi_master *master)
+{
+ struct synquacer_spi *sspi = spi_master_get_devdata(master);
+ u32 val;
+
+ /* Disable module */
+ writel_relaxed(0, sspi->regs + MCTRL);
+ val = 0xfffff;
+ while (--val && (readl_relaxed(sspi->regs + MCTRL) & MES))
+ cpu_relax();
+ if (!val)
+ return -EBUSY;
+
+ writel_relaxed(0, sspi->regs + TXE);
+ writel_relaxed(0, sspi->regs + RXE);
+ val = readl_relaxed(sspi->regs + TXF);
+ writel_relaxed(val, sspi->regs + TXC);
+ val = readl_relaxed(sspi->regs + RXF);
+ writel_relaxed(val, sspi->regs + RXC);
+ val = readl_relaxed(sspi->regs + FAULTF);
+ writel_relaxed(val, sspi->regs + FAULTC);
+
+ val = readl_relaxed(sspi->regs + DMCFG);
+ val &= ~SSDC;
+ val &= ~MSTARTEN;
+ writel_relaxed(val, sspi->regs + DMCFG);
+
+ val = readl_relaxed(sspi->regs + MCTRL);
+ if (IS_ERR(sspi->clk[IPCLK]))
+ val &= ~BPCLK;
+ else
+ val |= BPCLK;
+
+ val &= ~CSEN;
+ val |= MEN;
+ val |= SYNCON;
+ writel_relaxed(val, sspi->regs + MCTRL);
+
+ return 0;
+}
+
+static int synquacer_spi_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct spi_master *master;
+ struct synquacer_spi *sspi;
+ struct resource *res;
+ int ret;
+
+ master = spi_alloc_master(&pdev->dev, sizeof(*sspi));
+ if (!master)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, master);
+
+ sspi = spi_master_get_devdata(master);
+ sspi->dev = &pdev->dev;
+ sspi->master = master;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ sspi->regs = devm_ioremap_resource(sspi->dev, res);
+ if (IS_ERR(sspi->regs)) {
+ ret = PTR_ERR(sspi->regs);
+ goto put_spi;
+ }
+
+ sspi->clk[IHCLK] = devm_clk_get(sspi->dev, "iHCLK");
+ if (IS_ERR(sspi->clk[IHCLK])) {
+ dev_err(&pdev->dev, "iHCLK not found\n");
+ ret = PTR_ERR(sspi->clk[IHCLK]);
+ goto put_spi;
+ }
+
+ sspi->clk[IPCLK] = devm_clk_get(sspi->dev, "iPCLK");
+
+ sspi->aces = of_property_read_bool(np, "socionext,set-aces");
+ sspi->rtm = of_property_read_bool(np, "socionext,use-rtm");
+
+ master->num_chipselect = 4; /* max 4 supported */
+
+ clk_prepare_enable(sspi->clk[IPCLK]);
+ ret = clk_prepare_enable(sspi->clk[IHCLK]);
+ if (ret)
+ goto put_spi;
+
+ master->dev.of_node = np;
+ master->auto_runtime_pm = true;
+ master->bus_num = pdev->id;
+
+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_TX_DUAL | SPI_RX_DUAL |
+ SPI_TX_QUAD | SPI_RX_QUAD;
+ master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(24)
+ | SPI_BPW_MASK(16) | SPI_BPW_MASK(8);
+
+ if (!IS_ERR(sspi->clk[IPCLK]))
+ master->max_speed_hz = clk_get_rate(sspi->clk[IPCLK]);
+ else
+ master->max_speed_hz = clk_get_rate(sspi->clk[IHCLK]);
+ master->min_speed_hz = master->max_speed_hz / 254;
+
+ master->set_cs = synquacer_spi_set_cs;
+ master->transfer_one = synquacer_spi_transfer_one;
+
+ ret = synquacer_spi_enable(master);
+ if (ret)
+ goto fail_enable;
+
+ pm_runtime_set_active(sspi->dev);
+ pm_runtime_enable(sspi->dev);
+
+ ret = devm_spi_register_master(sspi->dev, master);
+ if (ret)
+ goto disable_pm;
+
+ return 0;
+
+disable_pm:
+ pm_runtime_disable(sspi->dev);
+fail_enable:
+ clk_disable_unprepare(sspi->clk[IHCLK]);
+ clk_disable_unprepare(sspi->clk[IPCLK]);
+put_spi:
+ spi_master_put(master);
+
+ return ret;
+}
+
+static int synquacer_spi_remove(struct platform_device *pdev)
+{
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct synquacer_spi *sspi = spi_master_get_devdata(master);
+
+ pm_runtime_disable(sspi->dev);
+ clk_disable_unprepare(sspi->clk[IHCLK]);
+ clk_disable_unprepare(sspi->clk[IPCLK]);
+ spi_master_put(master);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int synquacer_spi_suspend(struct device *dev)
+{
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct synquacer_spi *sspi = spi_master_get_devdata(master);
+ int ret;
+
+ ret = spi_master_suspend(master);
+ if (ret)
+ return ret;
+
+ if (!pm_runtime_suspended(dev)) {
+ clk_disable_unprepare(sspi->clk[IPCLK]);
+ clk_disable_unprepare(sspi->clk[IHCLK]);
+ }
+
+ return ret;
+}
+
+static int synquacer_spi_resume(struct device *dev)
+{
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct synquacer_spi *sspi = spi_master_get_devdata(master);
+ int ret;
+
+ if (!pm_runtime_suspended(dev)) {
+ /* Ensure reconfigure during next xfer */
+ sspi->speed = 0;
+
+ clk_prepare_enable(sspi->clk[IPCLK]);
+ ret = clk_prepare_enable(sspi->clk[IHCLK]);
+ if (ret < 0) {
+ dev_err(dev, "failed to enable clk (%d)\n", ret);
+ return ret;
+ }
+
+ ret = synquacer_spi_enable(master);
+ if (ret) {
+ dev_err(dev, "failed to enable spi (%d)\n", ret);
+ return ret;
+ }
+ }
+
+ ret = spi_master_resume(master);
+ if (ret < 0) {
+ clk_disable_unprepare(sspi->clk[IHCLK]);
+ clk_disable_unprepare(sspi->clk[IPCLK]);
+ }
+
+ return ret;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops synquacer_spi_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(synquacer_spi_suspend, synquacer_spi_resume)
+};
+
+static const struct of_device_id synquacer_spi_of_match[] = {
+ {.compatible = "socionext,synquacer-spi",},
+ {},
+};
+MODULE_DEVICE_TABLE(of, synquacer_spi_of_match);
+
+static struct platform_driver synquacer_spi_driver = {
+ .driver = {
+ .name = "synquacer-spi",
+ .pm = &synquacer_spi_pm_ops,
+ .of_match_table = of_match_ptr(synquacer_spi_of_match),
+ },
+ .probe = synquacer_spi_probe,
+ .remove = synquacer_spi_remove,
+};
+module_platform_driver(synquacer_spi_driver);
+
+MODULE_DESCRIPTION("Socionext Synquacer HS-SPI controller driver");
+MODULE_AUTHOR("Jassi Brar <jaswinder.singh@xxxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
--
2.7.4
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