From: INAGAKI Hiroshi Date: Thu, 6 May 2021 10:30:58 +0000 (+0900) Subject: realtek: backport spi-realtek-rtl driver from 5.12 to 5.10 X-Git-Tag: v22.03.0-rc1~1700 X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=0b000cbfe0aa0323bffa855ef8449c0687a4c071;p=openwrt%2Fopenwrt.git realtek: backport spi-realtek-rtl driver from 5.12 to 5.10 This patch backports "spi-realtek-rtl" driver to Kernel 5.10 from 5.12. "MACH_REALTEK_RTL" is used as a platform name in upstream, but "RTL838X" is used in OpenWrt, so update the dependency by the additional patch. Signed-off-by: INAGAKI Hiroshi --- diff --git a/target/linux/realtek/patches-5.10/003-5.12-spi-realtek-rtl838x-rtl839x-spi-controller.patch b/target/linux/realtek/patches-5.10/003-5.12-spi-realtek-rtl838x-rtl839x-spi-controller.patch new file mode 100644 index 0000000000..035b0e655f --- /dev/null +++ b/target/linux/realtek/patches-5.10/003-5.12-spi-realtek-rtl838x-rtl839x-spi-controller.patch @@ -0,0 +1,63 @@ +From 6acbd614c2c8d3b8de5fb7605d6e24b9b3a8a17b Mon Sep 17 00:00:00 2001 +From: Bert Vermeulen +Date: Wed, 20 Jan 2021 14:59:27 +0100 +Subject: spi: Realtek RTL838x/RTL839x SPI controller + +Signed-off-by: Bert Vermeulen +Link: https://lore.kernel.org/r/20210120135928.246054-2-bert@biot.com +Signed-off-by: Mark Brown +--- + .../devicetree/bindings/spi/realtek,rtl-spi.yaml | 41 ++++++++++++++++++++++ + 1 file changed, 41 insertions(+) + create mode 100644 Documentation/devicetree/bindings/spi/realtek,rtl-spi.yaml + +diff --git a/Documentation/devicetree/bindings/spi/realtek,rtl-spi.yaml b/Documentation/devicetree/bindings/spi/realtek,rtl-spi.yaml +new file mode 100644 +index 0000000000000..30a62a211984f +--- /dev/null ++++ b/Documentation/devicetree/bindings/spi/realtek,rtl-spi.yaml +@@ -0,0 +1,41 @@ ++# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) ++%YAML 1.2 ++--- ++$id: http://devicetree.org/schemas/spi/realtek,rtl-spi.yaml# ++$schema: http://devicetree.org/meta-schemas/core.yaml# ++ ++title: Realtek RTL838x/RTL839x SPI controller ++ ++maintainers: ++ - Bert Vermeulen ++ - Birger Koblitz ++ ++allOf: ++ - $ref: "spi-controller.yaml#" ++ ++properties: ++ compatible: ++ oneOf: ++ - const: realtek,rtl8380-spi ++ - const: realtek,rtl8382-spi ++ - const: realtek,rtl8391-spi ++ - const: realtek,rtl8392-spi ++ - const: realtek,rtl8393-spi ++ ++ reg: ++ maxItems: 1 ++ ++required: ++ - compatible ++ - reg ++ ++unevaluatedProperties: false ++ ++examples: ++ - | ++ spi: spi@1200 { ++ compatible = "realtek,rtl8382-spi"; ++ reg = <0x1200 0x100>; ++ #address-cells = <1>; ++ #size-cells = <0>; ++ }; +-- +cgit 1.2.3-1.el7 + 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 new file mode 100644 index 0000000000..090847baad --- /dev/null +++ b/target/linux/realtek/patches-5.10/004-5.12-spi-realtek-rtl-add-support-for-realtek-rtl838x-rtl839x-spi-controllers.patch @@ -0,0 +1,248 @@ +From a8af5cc2ff1e804694629a8ef320935629dd15ba Mon Sep 17 00:00:00 2001 +From: Bert Vermeulen +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 +Link: https://lore.kernel.org/r/20210120135928.246054-3-bert@biot.com +Signed-off-by: Mark Brown +--- + 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 ++#include ++#include ++#include ++ ++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 "); ++MODULE_DESCRIPTION("Realtek RTL SPI driver"); diff --git a/target/linux/realtek/patches-5.10/304-spi-update-dependency-for-spi-realtek-rtl.patch b/target/linux/realtek/patches-5.10/304-spi-update-dependency-for-spi-realtek-rtl.patch new file mode 100644 index 0000000000..6975bfd228 --- /dev/null +++ b/target/linux/realtek/patches-5.10/304-spi-update-dependency-for-spi-realtek-rtl.patch @@ -0,0 +1,11 @@ +--- a/drivers/spi/Makefile ++++ b/drivers/spi/Makefile +@@ -94,7 +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-$(CONFIG_RTL838X) += spi-realtek-rtl.o + obj-$(CONFIG_SPI_RPCIF) += spi-rpc-if.o + obj-$(CONFIG_SPI_RSPI) += spi-rspi.o + obj-$(CONFIG_SPI_S3C24XX) += spi-s3c24xx-hw.o