diff options
Diffstat (limited to 'target/linux/realtek/patches-5.10/004-5.12-spi-realtek-rtl-add-support-for-realtek-rtl838x-rtl839x-spi-controllers.patch')
-rw-r--r-- | target/linux/realtek/patches-5.10/004-5.12-spi-realtek-rtl-add-support-for-realtek-rtl838x-rtl839x-spi-controllers.patch | 248 |
1 files changed, 0 insertions, 248 deletions
diff --git a/target/linux/realtek/patches-5.10/004-5.12-spi-realtek-rtl-add-support-for-realtek-rtl838x-rtl839x-spi-controllers.patch b/target/linux/realtek/patches-5.10/004-5.12-spi-realtek-rtl-add-support-for-realtek-rtl838x-rtl839x-spi-controllers.patch deleted file mode 100644 index 090847baad..0000000000 --- a/target/linux/realtek/patches-5.10/004-5.12-spi-realtek-rtl-add-support-for-realtek-rtl838x-rtl839x-spi-controllers.patch +++ /dev/null @@ -1,248 +0,0 @@ -From a8af5cc2ff1e804694629a8ef320935629dd15ba Mon Sep 17 00:00:00 2001 -From: Bert Vermeulen <bert@biot.com> -Date: Wed, 20 Jan 2021 14:59:28 +0100 -Subject: spi: realtek-rtl: Add support for Realtek RTL838x/RTL839x SPI - controllers - -This driver likely also supports earlier (RTL8196) and later (RTL93xx) -SoCs. - -The SPI hardware in these SoCs is specifically intended for connecting NOR -bootflash chips, and only used for that in dozens of examined devices. -However boiled down to basics, it's really just a half-duplex SPI -controller. - -The hardware appears to have a vestigial second chip-select control, but -it hasn't been seen in the wild and is thus not supported. - -Signed-off-by: Bert Vermeulen <bert@biot.com> -Link: https://lore.kernel.org/r/20210120135928.246054-3-bert@biot.com -Signed-off-by: Mark Brown <broonie@kernel.org> ---- - drivers/spi/Makefile | 1 + - drivers/spi/spi-realtek-rtl.c | 209 ++++++++++++++++++++++++++++++++++++++++++ - 2 files changed, 210 insertions(+) - create mode 100644 drivers/spi/spi-realtek-rtl.c - ---- a/drivers/spi/Makefile -+++ b/drivers/spi/Makefile -@@ -94,6 +94,7 @@ obj-$(CONFIG_SPI_QCOM_QSPI) += spi-qcom - obj-$(CONFIG_SPI_QUP) += spi-qup.o - obj-$(CONFIG_SPI_ROCKCHIP) += spi-rockchip.o - obj-$(CONFIG_SPI_RB4XX) += spi-rb4xx.o -+obj-$(CONFIG_MACH_REALTEK_RTL) += spi-realtek-rtl.o - obj-$(CONFIG_SPI_RPCIF) += spi-rpc-if.o - obj-$(CONFIG_SPI_RSPI) += spi-rspi.o - obj-$(CONFIG_SPI_S3C24XX) += spi-s3c24xx-hw.o ---- /dev/null -+++ b/drivers/spi/spi-realtek-rtl.c -@@ -0,0 +1,209 @@ -+// SPDX-License-Identifier: GPL-2.0-only -+ -+#include <linux/module.h> -+#include <linux/platform_device.h> -+#include <linux/mod_devicetable.h> -+#include <linux/spi/spi.h> -+ -+struct rtspi { -+ void __iomem *base; -+}; -+ -+/* SPI Flash Configuration Register */ -+#define RTL_SPI_SFCR 0x00 -+#define RTL_SPI_SFCR_RBO BIT(28) -+#define RTL_SPI_SFCR_WBO BIT(27) -+ -+/* SPI Flash Control and Status Register */ -+#define RTL_SPI_SFCSR 0x08 -+#define RTL_SPI_SFCSR_CSB0 BIT(31) -+#define RTL_SPI_SFCSR_CSB1 BIT(30) -+#define RTL_SPI_SFCSR_RDY BIT(27) -+#define RTL_SPI_SFCSR_CS BIT(24) -+#define RTL_SPI_SFCSR_LEN_MASK ~(0x03 << 28) -+#define RTL_SPI_SFCSR_LEN1 (0x00 << 28) -+#define RTL_SPI_SFCSR_LEN4 (0x03 << 28) -+ -+/* SPI Flash Data Register */ -+#define RTL_SPI_SFDR 0x0c -+ -+#define REG(x) (rtspi->base + x) -+ -+ -+static void rt_set_cs(struct spi_device *spi, bool active) -+{ -+ struct rtspi *rtspi = spi_controller_get_devdata(spi->controller); -+ u32 value; -+ -+ /* CS0 bit is active low */ -+ value = readl(REG(RTL_SPI_SFCSR)); -+ if (active) -+ value |= RTL_SPI_SFCSR_CSB0; -+ else -+ value &= ~RTL_SPI_SFCSR_CSB0; -+ writel(value, REG(RTL_SPI_SFCSR)); -+} -+ -+static void set_size(struct rtspi *rtspi, int size) -+{ -+ u32 value; -+ -+ value = readl(REG(RTL_SPI_SFCSR)); -+ value &= RTL_SPI_SFCSR_LEN_MASK; -+ if (size == 4) -+ value |= RTL_SPI_SFCSR_LEN4; -+ else if (size == 1) -+ value |= RTL_SPI_SFCSR_LEN1; -+ writel(value, REG(RTL_SPI_SFCSR)); -+} -+ -+static inline void wait_ready(struct rtspi *rtspi) -+{ -+ while (!(readl(REG(RTL_SPI_SFCSR)) & RTL_SPI_SFCSR_RDY)) -+ cpu_relax(); -+} -+static void send4(struct rtspi *rtspi, const u32 *buf) -+{ -+ wait_ready(rtspi); -+ set_size(rtspi, 4); -+ writel(*buf, REG(RTL_SPI_SFDR)); -+} -+ -+static void send1(struct rtspi *rtspi, const u8 *buf) -+{ -+ wait_ready(rtspi); -+ set_size(rtspi, 1); -+ writel(buf[0] << 24, REG(RTL_SPI_SFDR)); -+} -+ -+static void rcv4(struct rtspi *rtspi, u32 *buf) -+{ -+ wait_ready(rtspi); -+ set_size(rtspi, 4); -+ *buf = readl(REG(RTL_SPI_SFDR)); -+} -+ -+static void rcv1(struct rtspi *rtspi, u8 *buf) -+{ -+ wait_ready(rtspi); -+ set_size(rtspi, 1); -+ *buf = readl(REG(RTL_SPI_SFDR)) >> 24; -+} -+ -+static int transfer_one(struct spi_controller *ctrl, struct spi_device *spi, -+ struct spi_transfer *xfer) -+{ -+ struct rtspi *rtspi = spi_controller_get_devdata(ctrl); -+ void *rx_buf; -+ const void *tx_buf; -+ int cnt; -+ -+ tx_buf = xfer->tx_buf; -+ rx_buf = xfer->rx_buf; -+ cnt = xfer->len; -+ if (tx_buf) { -+ while (cnt >= 4) { -+ send4(rtspi, tx_buf); -+ tx_buf += 4; -+ cnt -= 4; -+ } -+ while (cnt) { -+ send1(rtspi, tx_buf); -+ tx_buf++; -+ cnt--; -+ } -+ } else if (rx_buf) { -+ while (cnt >= 4) { -+ rcv4(rtspi, rx_buf); -+ rx_buf += 4; -+ cnt -= 4; -+ } -+ while (cnt) { -+ rcv1(rtspi, rx_buf); -+ rx_buf++; -+ cnt--; -+ } -+ } -+ -+ spi_finalize_current_transfer(ctrl); -+ -+ return 0; -+} -+ -+static void init_hw(struct rtspi *rtspi) -+{ -+ u32 value; -+ -+ /* Turn on big-endian byte ordering */ -+ value = readl(REG(RTL_SPI_SFCR)); -+ value |= RTL_SPI_SFCR_RBO | RTL_SPI_SFCR_WBO; -+ writel(value, REG(RTL_SPI_SFCR)); -+ -+ value = readl(REG(RTL_SPI_SFCSR)); -+ /* Permanently disable CS1, since it's never used */ -+ value |= RTL_SPI_SFCSR_CSB1; -+ /* Select CS0 for use */ -+ value &= RTL_SPI_SFCSR_CS; -+ writel(value, REG(RTL_SPI_SFCSR)); -+} -+ -+static int realtek_rtl_spi_probe(struct platform_device *pdev) -+{ -+ struct spi_controller *ctrl; -+ struct rtspi *rtspi; -+ int err; -+ -+ ctrl = devm_spi_alloc_master(&pdev->dev, sizeof(*rtspi)); -+ if (!ctrl) { -+ dev_err(&pdev->dev, "Error allocating SPI controller\n"); -+ return -ENOMEM; -+ } -+ platform_set_drvdata(pdev, ctrl); -+ rtspi = spi_controller_get_devdata(ctrl); -+ -+ rtspi->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); -+ if (IS_ERR(rtspi->base)) { -+ dev_err(&pdev->dev, "Could not map SPI register address"); -+ return -ENOMEM; -+ } -+ -+ init_hw(rtspi); -+ -+ ctrl->dev.of_node = pdev->dev.of_node; -+ ctrl->flags = SPI_CONTROLLER_HALF_DUPLEX; -+ ctrl->set_cs = rt_set_cs; -+ ctrl->transfer_one = transfer_one; -+ -+ err = devm_spi_register_controller(&pdev->dev, ctrl); -+ if (err) { -+ dev_err(&pdev->dev, "Could not register SPI controller\n"); -+ return -ENODEV; -+ } -+ -+ return 0; -+} -+ -+ -+static const struct of_device_id realtek_rtl_spi_of_ids[] = { -+ { .compatible = "realtek,rtl8380-spi" }, -+ { .compatible = "realtek,rtl8382-spi" }, -+ { .compatible = "realtek,rtl8391-spi" }, -+ { .compatible = "realtek,rtl8392-spi" }, -+ { .compatible = "realtek,rtl8393-spi" }, -+ { /* sentinel */ } -+}; -+MODULE_DEVICE_TABLE(of, realtek_rtl_spi_of_ids); -+ -+static struct platform_driver realtek_rtl_spi_driver = { -+ .probe = realtek_rtl_spi_probe, -+ .driver = { -+ .name = "realtek-rtl-spi", -+ .of_match_table = realtek_rtl_spi_of_ids, -+ }, -+}; -+ -+module_platform_driver(realtek_rtl_spi_driver); -+ -+MODULE_LICENSE("GPL v2"); -+MODULE_AUTHOR("Bert Vermeulen <bert@biot.com>"); -+MODULE_DESCRIPTION("Realtek RTL SPI driver"); |