[PATCH v3 0/4] Add Rockchip SFC(serial flash controller) support

[PATCH v3 0/4] Add Rockchip SFC(serial flash controller) support

[Chris Morgan]

From: Chris Morgan <macromorgan@hotmail.com>

I'm trying to revive an abandoned patch series for the Rockchip serial
flash controller (SFC) found on the Rockchip PX30 SOC, as well as other
SOCs by Rockchip. I'm picking this up from version 8 of the patch
series located from here:

http://patchwork.ozlabs.org/project/linux-mtd/cover/1518091958-3672-1-git-send-email-andy.yan@rock-chips.com/

Changes made in v3:
 - Changed the name of the clocks to sfc/ahb (from clk-sfc/clk-hsfc).
 - Changed the compatible string from rockchip,sfc to
   rockchip,rk3036-sfc. A quick glance at the datasheets suggests this
   driver should work for the PX30, RK180x, RK3036, RK312x, RK3308 and
   RV1108 SoCs, and possibly more. However, I am currently only able
   to test this on a PX30 (an RK3326). The technical reference manuals
   appear to list the same registers for each device.
 - Corrected devicetree documentation for formatting and to note these
   changes.
 - Replaced the maintainer with Heiko Stuebner and myself, as we will
   take ownership of this going forward.
 - Noted that the device (per the reference manual) supports 4 CS, but
   I am only able to test a single CS (CS 0).
 - Reordered patches to comply with upstream rules.

Changes made in v2:
 - Reimplemented driver using spi-mem subsystem.
 - Removed power management code as I couldn't get it working properly.
 - Added device tree bindings for Odroid Go Advance.

Changes made in this new series versus the v8 of the old series:
 - Added function to read spi-rx-bus-width from device tree, in the
   event that the SPI chip supports 4x mode but only has 2 pins
   wired (such as the Odroid Go Advance).
 - Changed device tree documentation from txt to yaml format.
 - Made "reset" message a dev_dbg from a dev_info.
 - Changed read and write fifo functions to remove redundant checks.
 - Changed the write and read from relaxed to non-relaxed when
   starting the DMA transfer or reading the DMA IRQ.
 - Changed from dma_coerce_mask_and_coherent to just
   dma_set_mask_and_coherent.
 - Changed name of get_if_type to rockchip_sfc_get_if_type.

Chris Morgan (4):
  dt-bindings: rockchip-sfc: Bindings for Rockchip serial flash
    controller
  spi: rockchip-sfc: add rockchip serial flash controller driver
  arm64: dts: rockchip: Add SFC to PX30
  arm64: dts: rockchip: Enable SFC for Odroid Go Advance

 .../devicetree/bindings/spi/rockchip,sfc.yaml |  87 ++
 arch/arm64/boot/dts/rockchip/px30.dtsi        |  38 +
 .../boot/dts/rockchip/rk3326-odroid-go2.dts   |  16 +
 drivers/spi/Kconfig                           |   9 +
 drivers/spi/Makefile                          |   1 +
 drivers/spi/spi-rockchip-sfc.c                | 861 ++++++++++++++++++
 6 files changed, 1012 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/rockchip,sfc.yaml
 create mode 100644 drivers/spi/spi-rockchip-sfc.c

-- 
2.25.1


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[PATCH v3 1/4] dt-bindings: rockchip-sfc: Bindings for Rockchip serial flash controller

[Chris Morgan]

From: Chris Morgan <macromorgan@hotmail.com>

Add bindings for the Rockchip serial flash controller. New device
specific parameter of rockchip,sfc-no-dma included in documentation.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
---
 .../devicetree/bindings/spi/rockchip,sfc.yaml | 87 +++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/rockchip,sfc.yaml

diff --git a/Documentation/devicetree/bindings/spi/rockchip,sfc.yaml b/Documentation/devicetree/bindings/spi/rockchip,sfc.yaml
new file mode 100644
index 000000000000..d5f8edd621ae
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/rockchip,sfc.yaml
@@ -0,0 +1,87 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/rockchip,sfc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip Serial Flash Controller (SFC)
+
+maintainers:
+  - Heiko Stuebner <heiko@sntech.de>
+  - Chris Morgan <macromorgan@hotmail.com>
+
+allOf:
+  - $ref: spi-controller.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - const: rockchip,px30-sfc
+      - const: rockchip,rk1806-sfc
+      - const: rockchip,rk1808-sfc
+      - const: rockchip,rk312x-sfc
+      - const: rockchip,rk3308-sfc
+      - const: rockchip,rv1108-sfc
+      - items:
+          - const: rockchip,rk3036-sfc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Bus Clock
+      - description: Module Clock
+
+  clock-names:
+    items:
+      - const: ahb
+      - const: sfc
+
+  power-domains:
+    maxItems: 1
+
+  rockchip,sfc-no-dma:
+    vendor,bool-property:
+      descrption: Boolean value for disabling DMA
+      type: boolean
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/px30-cru.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    sfc: spi@ff3a0000 {
+        compatible = "rockchip,px30-sfc","rockchip,rk3036-sfc";
+        reg = <0x0 0xff3a0000 0x0 0x4000>;
+        interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&cru SCLK_SFC>, <&cru HCLK_SFC>;
+        clock-names = "sfc", "ahb";
+        pinctrl-0 = <&sfc_clk &sfc_cs &sfc_bus2>;
+        pinctrl-names = "default";
+        power-domains = <&power PX30_PD_MMC_NAND>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        flash@0 {
+            compatible = "jedec,spi-nor";
+            spi-max-frequency = <108000000>;
+            reg = <0>;
+            spi-rx-bus-width = <2>;
+            spi-tx-bus-width = <2>;
+        };
+    };
+
+...
-- 
2.25.1


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[PATCH v3 2/4] spi: rockchip-sfc: add rockchip serial flash controller driver

[Chris Morgan]

From: Chris Morgan <macromorgan@hotmail.com>

Add the rockchip serial flash controller (SFC) driver.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
---
 drivers/spi/Kconfig            |   9 +
 drivers/spi/Makefile           |   1 +
 drivers/spi/spi-rockchip-sfc.c | 861 +++++++++++++++++++++++++++++++++
 3 files changed, 871 insertions(+)
 create mode 100644 drivers/spi/spi-rockchip-sfc.c

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index f4481fe48bf0..4d81ba7841e2 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -658,6 +658,15 @@ config SPI_ROCKCHIP
 	  The main usecase of this controller is to use spi flash as boot
 	  device.
 
+config SPI_ROCKCHIP_SFC
+	tristate "Rockchip Serial Flash Controller (SFC)"
+	depends on ARCH_ROCKCHIP || COMPILE_TEST
+	depends on HAS_IOMEM && HAS_DMA
+	help
+	  This enables support for Rockchip serial flash controller. This
+	  is a specialized controller used to access SPI flash on some
+	  Rockchip SOCs.
+
 config SPI_RB4XX
 	tristate "Mikrotik RB4XX SPI master"
 	depends on SPI_MASTER && ATH79
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 13e54c45e9df..699db95c8441 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -95,6 +95,7 @@ obj-$(CONFIG_SPI_QCOM_GENI)		+= spi-geni-qcom.o
 obj-$(CONFIG_SPI_QCOM_QSPI)		+= spi-qcom-qspi.o
 obj-$(CONFIG_SPI_QUP)			+= spi-qup.o
 obj-$(CONFIG_SPI_ROCKCHIP)		+= spi-rockchip.o
+obj-$(CONFIG_SPI_ROCKCHIP_SFC)		+= spi-rockchip-sfc.o
 obj-$(CONFIG_SPI_RB4XX)			+= spi-rb4xx.o
 obj-$(CONFIG_MACH_REALTEK_RTL)		+= spi-realtek-rtl.o
 obj-$(CONFIG_SPI_RPCIF)			+= spi-rpc-if.o
diff --git a/drivers/spi/spi-rockchip-sfc.c b/drivers/spi/spi-rockchip-sfc.c
new file mode 100644
index 000000000000..c039f96d2327
--- /dev/null
+++ b/drivers/spi/spi-rockchip-sfc.c
@@ -0,0 +1,861 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Rockchip Serial Flash Controller Driver
+ *
+ * Copyright (c) 2017, Rockchip Inc.
+ * Author: Shawn Lin <shawn.lin@rock-chips.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/dma-mapping.h>
+#include <linux/iopoll.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/spi/spi-mem.h>
+
+/* System control */
+#define SFC_CTRL			0x0
+#define  SFC_CTRL_COMMON_BITS_1		0x0
+#define  SFC_CTRL_COMMON_BITS_2		0x1
+#define  SFC_CTRL_COMMON_BITS_4		0x2
+#define  SFC_CTRL_DATA_BITS_SHIFT	12
+#define  SFC_CTRL_ADDR_BITS_SHIFT	10
+#define  SFC_CTRL_CMD_BITS_SHIFT	8
+#define  SFC_CTRL_PHASE_SEL_NEGETIVE	BIT(1)
+
+/* Interrupt mask */
+#define SFC_IMR				0x4
+#define  SFC_IMR_RX_FULL		BIT(0)
+#define  SFC_IMR_RX_UFLOW		BIT(1)
+#define  SFC_IMR_TX_OFLOW		BIT(2)
+#define  SFC_IMR_TX_EMPTY		BIT(3)
+#define  SFC_IMR_TRAN_FINISH		BIT(4)
+#define  SFC_IMR_BUS_ERR		BIT(5)
+#define  SFC_IMR_NSPI_ERR		BIT(6)
+#define  SFC_IMR_DMA			BIT(7)
+
+/* Interrupt clear */
+#define SFC_ICLR			0x8
+#define  SFC_ICLR_RX_FULL		BIT(0)
+#define  SFC_ICLR_RX_UFLOW		BIT(1)
+#define  SFC_ICLR_TX_OFLOW		BIT(2)
+#define  SFC_ICLR_TX_EMPTY		BIT(3)
+#define  SFC_ICLR_TRAN_FINISH		BIT(4)
+#define  SFC_ICLR_BUS_ERR		BIT(5)
+#define  SFC_ICLR_NSPI_ERR		BIT(6)
+#define  SFC_ICLR_DMA			BIT(7)
+
+/* FIFO threshold level */
+#define SFC_FTLR			0xc
+#define  SFC_FTLR_TX_SHIFT		0
+#define  SFC_FTLR_TX_MASK		0x1f
+#define  SFC_FTLR_RX_SHIFT		8
+#define  SFC_FTLR_RX_MASK		0x1f
+
+/* Reset FSM and FIFO */
+#define SFC_RCVR			0x10
+#define  SFC_RCVR_RESET			BIT(0)
+
+/* Enhanced mode */
+#define SFC_AX				0x14
+
+/* Address Bit number */
+#define SFC_ABIT			0x18
+
+/* Interrupt status */
+#define SFC_ISR				0x1c
+#define  SFC_ISR_RX_FULL_SHIFT		BIT(0)
+#define  SFC_ISR_RX_UFLOW_SHIFT		BIT(1)
+#define  SFC_ISR_TX_OFLOW_SHIFT		BIT(2)
+#define  SFC_ISR_TX_EMPTY_SHIFT		BIT(3)
+#define  SFC_ISR_TX_FINISH_SHIFT	BIT(4)
+#define  SFC_ISR_BUS_ERR_SHIFT		BIT(5)
+#define  SFC_ISR_NSPI_ERR_SHIFT		BIT(6)
+#define  SFC_ISR_DMA_SHIFT		BIT(7)
+
+/* FIFO status */
+#define SFC_FSR				0x20
+#define  SFC_FSR_TX_IS_FULL		BIT(0)
+#define  SFC_FSR_TX_IS_EMPTY		BIT(1)
+#define  SFC_FSR_RX_IS_EMPTY		BIT(2)
+#define  SFC_FSR_RX_IS_FULL		BIT(3)
+#define  SFC_FSR_TXLV_MASK		GENMASK(12, 8)
+#define  SFC_FSR_TXLV_SHIFT		8
+#define  SFC_FSR_RXLV_MASK		GENMASK(20, 16)
+#define  SFC_FSR_RXLV_SHIFT		16
+
+/* FSM status */
+#define SFC_SR				0x24
+#define  SFC_SR_IS_IDLE			0x0
+#define  SFC_SR_IS_BUSY			0x1
+
+/* Raw interrupt status */
+#define SFC_RISR			0x28
+#define  SFC_RISR_RX_FULL		BIT(0)
+#define  SFC_RISR_RX_UNDERFLOW		BIT(1)
+#define  SFC_RISR_TX_OVERFLOW		BIT(2)
+#define  SFC_RISR_TX_EMPTY		BIT(3)
+#define  SFC_RISR_TRAN_FINISH		BIT(4)
+#define  SFC_RISR_BUS_ERR		BIT(5)
+#define  SFC_RISR_NSPI_ERR		BIT(6)
+#define  SFC_RISR_DMA			BIT(7)
+
+/* Master trigger */
+#define SFC_DMA_TRIGGER			0x80
+
+/* Src or Dst addr for master */
+#define SFC_DMA_ADDR			0x84
+
+/* Command */
+#define SFC_CMD				0x100
+#define  SFC_CMD_IDX_SHIFT		0
+#define  SFC_CMD_DUMMY_SHIFT		8
+#define  SFC_CMD_DIR_RD			0
+#define  SFC_CMD_DIR_WR			1
+#define  SFC_CMD_DIR_SHIFT		12
+#define  SFC_CMD_ADDR_ZERO		(0x0 << 14)
+#define  SFC_CMD_ADDR_24BITS		(0x1 << 14)
+#define  SFC_CMD_ADDR_32BITS		(0x2 << 14)
+#define  SFC_CMD_ADDR_FRS		(0x3 << 14)
+#define  SFC_CMD_TRAN_BYTES_SHIFT	16
+#define  SFC_CMD_CS_SHIFT		30
+
+/* Address */
+#define SFC_ADDR			0x104
+
+/* Data */
+#define SFC_DATA			0x108
+
+/* The controller and documentation reports that it supports up to 4 CS
+ * devices (0-3), however I have only been able to test a single CS (CS 0)
+ * due to the configuration of my device.
+ */
+#define SFC_MAX_CHIPSELECT_NUM		4
+
+/* The SFC can transfer max 16KB - 1 at one time
+ * we set it to 15.5KB here for alignment.
+ */
+#define SFC_MAX_TRANS_BYTES		(512 * 31)
+
+/* Maximum clock values from datasheet suggest keeping clock value under
+ * 150MHz. No minimum or average value is suggested, but the U-boot BSP driver
+ * has a minimum of 10MHz and a default of 80MHz which seems reasonable.
+ */
+#define SFC_MIN_SPEED_HZ		(10 * 1000 * 1000)
+#define SFC_DEFAULT_SPEED_HZ		(80 * 1000 * 1000)
+#define SFC_MAX_SPEED_HZ		(150 * 1000 * 1000)
+
+#define SFC_CMD_DUMMY(x) \
+	((x) << SFC_CMD_DUMMY_SHIFT)
+
+enum rockchip_sfc_iftype {
+	IF_TYPE_STD,
+	IF_TYPE_DUAL,
+	IF_TYPE_QUAD,
+};
+
+struct rockchip_sfc;
+struct rockchip_sfc_chip_priv {
+	u8 cs;
+	u32 clk_rate;
+	struct rockchip_sfc *sfc;
+};
+
+struct rockchip_sfc {
+	struct device *dev;
+	void __iomem *regbase;
+	struct clk *hclk;
+	struct clk *clk;
+	/* virtual mapped addr for dma_buffer */
+	void *buffer;
+	dma_addr_t dma_buffer;
+	struct completion cp;
+	struct rockchip_sfc_chip_priv flash[SFC_MAX_CHIPSELECT_NUM];
+	u8 num_chip;
+	bool use_dma;
+};
+
+static int rockchip_sfc_get_if_type(const struct spi_mem_op *op,
+				    struct rockchip_sfc *sfc)
+{
+	if (op->data.buswidth == 2)
+		return IF_TYPE_DUAL;
+	else if (op->data.buswidth == 4)
+		return IF_TYPE_QUAD;
+	else if (op->data.buswidth == 1)
+		return IF_TYPE_STD;
+
+	dev_err(sfc->dev, "unsupported SPI read mode\n");
+
+	return -EINVAL;
+}
+
+static int rockchip_sfc_reset(struct rockchip_sfc *sfc)
+{
+	int err;
+	u32 status;
+
+	writel_relaxed(SFC_RCVR_RESET, sfc->regbase + SFC_RCVR);
+
+	err = readl_poll_timeout(sfc->regbase + SFC_RCVR, status,
+				 !(status & SFC_RCVR_RESET), 20,
+				 jiffies_to_usecs(HZ));
+	if (err)
+		dev_err(sfc->dev, "SFC reset never finished\n");
+
+	/* Still need to clear the masked interrupt from RISR */
+	writel_relaxed(SFC_ICLR_RX_FULL | SFC_ICLR_RX_UFLOW |
+		       SFC_ICLR_TX_OFLOW | SFC_ICLR_TX_EMPTY |
+		       SFC_ICLR_TRAN_FINISH | SFC_ICLR_BUS_ERR |
+		       SFC_ICLR_NSPI_ERR | SFC_ICLR_DMA,
+		       sfc->regbase + SFC_ICLR);
+
+	dev_dbg(sfc->dev, "reset\n");
+
+	return err;
+}
+
+static int rockchip_sfc_init(struct rockchip_sfc *sfc)
+{
+	int err;
+
+	err = clk_set_rate(sfc->clk, SFC_DEFAULT_SPEED_HZ);
+	if (err)
+		return err;
+
+	err = rockchip_sfc_reset(sfc);
+	if (err)
+		return err;
+
+	/* Mask all eight interrupts */
+	writel_relaxed(0xff, sfc->regbase + SFC_IMR);
+
+	writel_relaxed(SFC_CTRL_PHASE_SEL_NEGETIVE, sfc->regbase + SFC_CTRL);
+
+	return 0;
+}
+
+static inline int rockchip_sfc_get_fifo_level(struct rockchip_sfc *sfc, int wr)
+{
+	u32 fsr = readl_relaxed(sfc->regbase + SFC_FSR);
+	int level;
+
+	if (wr)
+		level = (fsr & SFC_FSR_TXLV_MASK) >> SFC_FSR_TXLV_SHIFT;
+	else
+		level = (fsr & SFC_FSR_RXLV_MASK) >> SFC_FSR_RXLV_SHIFT;
+
+	return level;
+}
+
+static int rockchip_sfc_wait_fifo_ready(struct rockchip_sfc *sfc, int wr, u32 timeout)
+{
+	unsigned long deadline = jiffies + timeout;
+	int level;
+
+	while (!(level = rockchip_sfc_get_fifo_level(sfc, wr))) {
+		if (time_after_eq(jiffies, deadline)) {
+			dev_warn(sfc->dev, "%s fifo timeout\n", wr ? "write" : "read");
+			return -ETIMEDOUT;
+		}
+		udelay(1);
+	}
+
+	return level;
+}
+
+/* The SFC_CTRL register is a global control register,
+ * when the controller is in busy state(SFC_SR),
+ * SFC_CTRL cannot be set.
+ */
+static void rockchip_sfc_wait_idle(struct rockchip_sfc *sfc, u32 timeout_us)
+{
+	u32 status;
+	int ret;
+
+	ret = readl_poll_timeout(sfc->regbase + SFC_SR, status,
+				 !(status & SFC_SR_IS_BUSY),
+				 20, timeout_us);
+	if (ret) {
+		dev_err(sfc->dev, "wait sfc idle timeout\n");
+		rockchip_sfc_reset(sfc);
+	}
+}
+
+static void rockchip_sfc_setup_ctrl(struct rockchip_sfc *sfc)
+{
+	u32 reg;
+
+	reg = IF_TYPE_STD << SFC_CTRL_DATA_BITS_SHIFT;
+	reg |= IF_TYPE_STD << SFC_CTRL_ADDR_BITS_SHIFT;
+	reg |= IF_TYPE_STD << SFC_CTRL_CMD_BITS_SHIFT;
+	reg |= SFC_CTRL_PHASE_SEL_NEGETIVE;
+
+	rockchip_sfc_wait_idle(sfc, 10000);
+
+	writel_relaxed(reg, sfc->regbase + SFC_CTRL);
+}
+
+static int rockchip_sfc_op_reg(struct rockchip_sfc_chip_priv *priv,
+			       u8 opcode, int len, u8 optype)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+	u32 reg;
+
+	rockchip_sfc_setup_ctrl(sfc);
+
+	reg = opcode << SFC_CMD_IDX_SHIFT;
+	reg |= len << SFC_CMD_TRAN_BYTES_SHIFT;
+	reg |= priv->cs << SFC_CMD_CS_SHIFT;
+	reg |= optype << SFC_CMD_DIR_SHIFT;
+	writel_relaxed(reg, sfc->regbase + SFC_CMD);
+
+	return 0;
+}
+
+static int rockchip_sfc_write_fifo(struct rockchip_sfc *sfc, const u8 *buf, int len)
+{
+	u8 bytes = len & 0x3;
+	u32 dwords;
+	int tx_level;
+	u32 write_words;
+	u32 tmp = 0;
+
+	dwords = len >> 2;
+	while (dwords) {
+		tx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_WR, HZ);
+		if (tx_level < 0)
+			return tx_level;
+		write_words = min_t(u32, tx_level, dwords);
+		iowrite32_rep(sfc->regbase + SFC_DATA, buf, write_words);
+		buf += write_words << 2;
+		dwords -= write_words;
+		}
+
+	/* write the rest non word aligned bytes */
+	if (bytes) {
+		tx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_WR, HZ);
+		if (tx_level < 0)
+			return tx_level;
+		memcpy(&tmp, buf, bytes);
+		writel_relaxed(tmp, sfc->regbase + SFC_DATA);
+	}
+
+	return len;
+}
+
+static int rockchip_sfc_read_fifo(struct rockchip_sfc *sfc, u8 *buf, int len)
+{
+	u8 bytes = len & 0x3;
+	u32 dwords;
+	u8 read_words;
+	int rx_level;
+	int tmp;
+
+	/* word aligned access only */
+	dwords = len >> 2;
+	while (dwords) {
+		rx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_RD, HZ);
+		if (rx_level < 0)
+			return rx_level;
+		read_words = min_t(u32, rx_level, dwords);
+		ioread32_rep(sfc->regbase + SFC_DATA, buf, read_words);
+		buf += read_words << 2;
+		dwords -= read_words;
+		}
+
+	/* read the rest non word aligned bytes */
+	if (bytes) {
+		rx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_RD, HZ);
+		if (rx_level < 0)
+			return rx_level;
+		tmp = readl_relaxed(sfc->regbase + SFC_DATA);
+		memcpy(buf, &tmp, bytes);
+	}
+
+	return len;
+}
+
+static int rockchip_sfc_read_reg(struct rockchip_sfc_chip_priv *priv,
+				 const struct spi_mem_op *op)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+	int ret;
+	int trans;
+	size_t n_rx = op->data.nbytes;
+	u8 opcode = op->cmd.opcode;
+	u8 *rxbuf = op->data.buf.in;
+
+	trans = min_t(int, n_rx, SFC_MAX_TRANS_BYTES);
+	ret = rockchip_sfc_op_reg(priv, opcode, trans, SFC_CMD_DIR_RD);
+	if (ret)
+		return ret;
+
+	ret = rockchip_sfc_read_fifo(sfc, rxbuf, trans);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int rockchip_sfc_write_reg(struct rockchip_sfc_chip_priv *priv,
+				  const struct spi_mem_op *op)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+	int ret;
+	size_t n_tx = op->data.nbytes;
+	u8 opcode = op->cmd.opcode;
+	const u8 *txbuf = op->data.buf.out;
+
+	ret = rockchip_sfc_op_reg(priv, opcode, n_tx, SFC_CMD_DIR_WR);
+	if (ret)
+		return ret;
+	ret = rockchip_sfc_write_fifo(sfc, txbuf, n_tx);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int rockchip_sfc_setup_transfer(struct rockchip_sfc_chip_priv *priv,
+				       const struct spi_mem_op *op,
+				       loff_t from_to, size_t len, u8 op_type)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+	u8 if_type = IF_TYPE_STD;
+	u8 addr_width = op->addr.nbytes;
+	u8 read_dummy_bits = op->dummy.nbytes << 3;
+	u32 reg;
+
+	if (op_type == SFC_CMD_DIR_RD)
+		if_type = rockchip_sfc_get_if_type(op, sfc);
+
+	rockchip_sfc_wait_idle(sfc, 10000);
+
+	writel_relaxed((if_type << SFC_CTRL_DATA_BITS_SHIFT) |
+		       (IF_TYPE_STD << SFC_CTRL_ADDR_BITS_SHIFT) |
+		       (IF_TYPE_STD << SFC_CTRL_CMD_BITS_SHIFT) |
+		       SFC_CTRL_PHASE_SEL_NEGETIVE,
+		       sfc->regbase + SFC_CTRL);
+
+	reg = op->cmd.opcode << SFC_CMD_IDX_SHIFT;
+
+	reg |= op_type << SFC_CMD_DIR_SHIFT;
+	reg |= (addr_width == 4) ?
+		SFC_CMD_ADDR_32BITS : SFC_CMD_ADDR_24BITS;
+
+	reg |= priv->cs << SFC_CMD_CS_SHIFT;
+	reg |= len << SFC_CMD_TRAN_BYTES_SHIFT;
+
+	if (op_type == SFC_CMD_DIR_RD)
+		reg |= SFC_CMD_DUMMY(read_dummy_bits);
+
+	writel_relaxed(reg, sfc->regbase + SFC_CMD);
+	writel_relaxed(from_to, sfc->regbase + SFC_ADDR);
+
+	return 0;
+}
+
+static int rockchip_sfc_do_dma_transfer(struct rockchip_sfc_chip_priv *priv,
+					const struct spi_mem_op *op, loff_t from_to,
+					dma_addr_t dma_buf, size_t len, u8 op_type)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+	u32 reg;
+	int err = 0;
+
+	init_completion(&sfc->cp);
+
+	writel_relaxed(SFC_ICLR_RX_FULL | SFC_ICLR_RX_UFLOW |
+		       SFC_ICLR_TX_OFLOW | SFC_ICLR_TX_EMPTY |
+		       SFC_ICLR_TRAN_FINISH | SFC_ICLR_BUS_ERR |
+		       SFC_ICLR_NSPI_ERR | SFC_ICLR_DMA,
+		       sfc->regbase + SFC_ICLR);
+
+	/* Enable transfer complete interrupt */
+	reg = readl_relaxed(sfc->regbase + SFC_IMR);
+	reg &= ~SFC_IMR_TRAN_FINISH;
+	writel_relaxed(reg, sfc->regbase + SFC_IMR);
+
+	err = rockchip_sfc_setup_transfer(priv, op, from_to, len, op_type);
+	if (err < 0)
+		return err;
+
+	writel_relaxed(dma_buf, sfc->regbase + SFC_DMA_ADDR);
+
+	/*
+	 * Start dma but note that the sfc->dma_buffer is derived from
+	 * dmam_alloc_coherent so we don't actually need any sync operations
+	 * for coherent dma memory.
+	 */
+	writel(0x1, sfc->regbase + SFC_DMA_TRIGGER);
+
+	/* Wait for the interrupt. */
+	if (!wait_for_completion_timeout(&sfc->cp, msecs_to_jiffies(2000))) {
+		dev_err(sfc->dev, "DMA wait for transfer finish timeout\n");
+		err = -ETIMEDOUT;
+	}
+
+	writel_relaxed(SFC_ICLR_RX_FULL | SFC_ICLR_RX_UFLOW |
+		       SFC_ICLR_TX_OFLOW | SFC_ICLR_TX_EMPTY |
+		       SFC_ICLR_TRAN_FINISH | SFC_ICLR_BUS_ERR |
+		       SFC_ICLR_NSPI_ERR | SFC_ICLR_DMA,
+		       sfc->regbase + SFC_ICLR);
+	/* Disable transfer finish interrupt */
+	reg = readl_relaxed(sfc->regbase + SFC_IMR);
+	reg |= SFC_IMR_TRAN_FINISH;
+	writel_relaxed(reg, sfc->regbase + SFC_IMR);
+
+	if (err) {
+		rockchip_sfc_reset(sfc);
+		return err;
+	}
+
+	return 0;
+}
+
+static inline int rockchip_sfc_pio_write(struct rockchip_sfc *sfc, u_char *buf,
+					 size_t len)
+{
+	return rockchip_sfc_write_fifo(sfc, buf, len);
+}
+
+static inline int rockchip_sfc_pio_read(struct rockchip_sfc *sfc, u_char *buf,
+					size_t len)
+{
+	return rockchip_sfc_read_fifo(sfc, buf, len);
+}
+
+static int rockchip_sfc_pio_transfer(struct rockchip_sfc_chip_priv *priv,
+				     const struct spi_mem_op *op, loff_t from_to, size_t len,
+				     u_char *buf, u8 op_type)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+	size_t trans;
+	int ret;
+
+	trans = min_t(size_t, SFC_MAX_TRANS_BYTES, len);
+	ret = rockchip_sfc_setup_transfer(priv, op, from_to, trans, op_type);
+	if (ret < 0)
+		return ret;
+
+	if (op_type == SFC_CMD_DIR_WR)
+		ret = rockchip_sfc_pio_write(sfc, buf, trans);
+	else
+		ret = rockchip_sfc_pio_read(sfc, buf, trans);
+
+	return ret;
+}
+
+static int rockchip_sfc_dma_transfer(struct rockchip_sfc_chip_priv *priv,
+				     const struct spi_mem_op *op, loff_t from_to, size_t len,
+				     u_char *buf, u8 op_type)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+	size_t trans;
+	int ret;
+
+	trans = min_t(size_t, SFC_MAX_TRANS_BYTES, len);
+
+	if (op_type == SFC_CMD_DIR_WR)
+		memcpy(sfc->buffer, buf, trans);
+
+	ret = rockchip_sfc_do_dma_transfer(priv, op, from_to, sfc->dma_buffer,
+					   trans, op_type);
+	if (ret) {
+		dev_warn(sfc->dev, "DMA timeout\n");
+		return ret;
+	}
+
+	if (op_type == SFC_CMD_DIR_RD)
+		memcpy(buf, sfc->buffer, trans);
+
+	return trans;
+}
+
+static ssize_t rockchip_sfc_do_rd_wr(struct rockchip_sfc_chip_priv *priv,
+				     const struct spi_mem_op *op, loff_t from_to, size_t len,
+				     u_char *buf, u32 op_type)
+{
+	struct rockchip_sfc *sfc = priv->sfc;
+
+	/* DMA can only handle word aligned transfer chunks */
+	if (likely(sfc->use_dma) && !(len & 0x3))
+		return rockchip_sfc_dma_transfer(priv, op, from_to, len, buf, op_type);
+	else
+		return rockchip_sfc_pio_transfer(priv, op, from_to, len, buf, op_type);
+}
+
+static ssize_t rockchip_sfc_read(struct rockchip_sfc_chip_priv *priv,
+				 const struct spi_mem_op *op)
+{
+	loff_t from = op->addr.val;
+	size_t len = op->data.nbytes;
+	u_char *read_buf = op->data.buf.in;
+
+	return rockchip_sfc_do_rd_wr(priv, op, from, len, read_buf, SFC_CMD_DIR_RD);
+}
+
+static ssize_t rockchip_sfc_write(struct rockchip_sfc_chip_priv *priv,
+				  const struct spi_mem_op *op)
+{
+	loff_t to = op->addr.val;
+	size_t len = op->data.nbytes;
+	const u_char *write_buf = op->data.buf.out;
+
+	return rockchip_sfc_do_rd_wr(priv, op, to, len, (u_char *)write_buf, SFC_CMD_DIR_WR);
+}
+
+static int rockchip_sfc_mem_process(struct spi_mem *mem, const struct spi_mem_op *op)
+{
+	struct rockchip_sfc *sfc = spi_master_get_devdata(mem->spi->master);
+	struct rockchip_sfc_chip_priv *priv = &sfc->flash[mem->spi->chip_select];
+
+	if (op->data.dir == SPI_MEM_DATA_IN && op->data.buf.in) {
+		if (!op->addr.nbytes)
+			return rockchip_sfc_read_reg(priv, op);
+
+		return rockchip_sfc_read(priv, op);
+	}
+
+	if (!op->addr.nbytes || !op->data.buf.out)
+		return rockchip_sfc_write_reg(priv, op);
+
+	return rockchip_sfc_write(priv, op);
+}
+
+static int rockchip_sfc_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
+{
+	struct rockchip_sfc *sfc = spi_master_get_devdata(mem->spi->master);
+	struct rockchip_sfc_chip_priv *priv = &sfc->flash[mem->spi->chip_select];
+	int ret;
+
+	ret = clk_set_rate(sfc->clk, priv->clk_rate);
+	if (ret)
+		return ret;
+
+	ret = rockchip_sfc_mem_process(mem, op);
+	if (ret < 0) {
+		dev_err(&mem->spi->dev, "operation failed with %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const char *rockchip_sfc_get_name(struct spi_mem *mem)
+{
+	struct rockchip_sfc *sfc = spi_master_get_devdata(mem->spi->master);
+	struct device *dev = sfc->dev;
+
+	return devm_kasprintf(dev, GFP_KERNEL, "%s.%d", dev_name(dev), mem->spi->chip_select);
+}
+
+static const struct spi_controller_mem_ops rockchip_sfc_mem_ops = {
+	.exec_op = rockchip_sfc_exec_mem_op,
+	.get_name = rockchip_sfc_get_name,
+};
+
+static int rockchip_sfc_register(struct device_node *np,
+				 struct rockchip_sfc *sfc)
+{
+	struct device *dev = sfc->dev;
+	int ret;
+
+	ret = of_property_read_u8(np, "reg", &sfc->flash[sfc->num_chip].cs);
+	if (ret) {
+		dev_err(dev, "No reg property for %s\n",
+			np->full_name);
+		return ret;
+	}
+
+	ret = of_property_read_u32(np, "spi-max-frequency",
+				   &sfc->flash[sfc->num_chip].clk_rate);
+	if (ret) {
+		dev_err(dev, "No spi-max-frequency property for %s\n",
+			np->full_name);
+		return ret;
+	}
+
+	sfc->flash[sfc->num_chip].sfc = sfc;
+	sfc->num_chip++;
+	return 0;
+}
+
+static int rockchip_sfc_register_all(struct rockchip_sfc *sfc)
+{
+	struct device *dev = sfc->dev;
+	struct device_node *np;
+	int ret;
+
+	for_each_available_child_of_node(dev->of_node, np) {
+		ret = rockchip_sfc_register(np, sfc);
+		if (ret)
+			dev_err(dev, "Failed to register all chips\n");
+			return ret;
+
+		if (sfc->num_chip >= SFC_MAX_CHIPSELECT_NUM) {
+			dev_warn(dev, "Exceeds the max cs limitation\n");
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static irqreturn_t rockchip_sfc_irq_handler(int irq, void *dev_id)
+{
+	struct rockchip_sfc *sfc = dev_id;
+	u32 reg;
+
+	reg = readl(sfc->regbase + SFC_RISR);
+
+	/* Clear interrupt */
+	writel_relaxed(reg, sfc->regbase + SFC_ICLR);
+
+	if (reg & SFC_RISR_TRAN_FINISH)
+		complete(&sfc->cp);
+
+	return IRQ_HANDLED;
+}
+
+static int rockchip_sfc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct spi_master *master;
+	struct resource *res;
+	struct rockchip_sfc *sfc;
+	int ret;
+
+	master = spi_alloc_master(&pdev->dev, sizeof(*sfc));
+	if (!master) {
+		dev_err(&pdev->dev, "spi_alloc_master failed\n");
+		return -ENOMEM;
+	}
+
+	master->mem_ops = &rockchip_sfc_mem_ops;
+	master->dev.of_node = pdev->dev.of_node;
+	master->mode_bits = SPI_RX_QUAD | SPI_RX_DUAL;
+	master->min_speed_hz = SFC_MIN_SPEED_HZ;
+	master->max_speed_hz = SFC_MAX_SPEED_HZ;
+
+	sfc = spi_master_get_devdata(master);
+	sfc->dev = dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	sfc->regbase = devm_ioremap_resource(dev, res);
+	if (IS_ERR(sfc->regbase))
+		return PTR_ERR(sfc->regbase);
+
+	sfc->clk = devm_clk_get(&pdev->dev, "sfc");
+	if (IS_ERR(sfc->clk)) {
+		dev_err(&pdev->dev, "Failed to get sfc interface clk\n");
+		return PTR_ERR(sfc->clk);
+	}
+
+	sfc->hclk = devm_clk_get(&pdev->dev, "ahb");
+	if (IS_ERR(sfc->hclk)) {
+		dev_err(&pdev->dev, "Failed to get sfc ahb clk\n");
+		return PTR_ERR(sfc->hclk);
+	}
+
+	sfc->use_dma = !of_property_read_bool(sfc->dev->of_node,
+					      "rockchip,sfc-no-dma");
+
+	if (sfc->use_dma) {
+		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+		if (ret) {
+			dev_warn(dev, "Unable to set dma mask\n");
+			return ret;
+		}
+
+		sfc->buffer = dmam_alloc_coherent(dev, SFC_MAX_TRANS_BYTES,
+						  &sfc->dma_buffer,
+						  GFP_KERNEL);
+		if (!sfc->buffer)
+			return -ENOMEM;
+	}
+
+	ret = clk_prepare_enable(sfc->hclk);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to enable ahb clk\n");
+		goto err_hclk;
+	}
+
+	ret = clk_prepare_enable(sfc->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to enable interface clk\n");
+		goto err_clk;
+	}
+
+	/* Find the irq */
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0) {
+		dev_err(dev, "Failed to get the irq\n");
+		goto err_irq;
+	}
+
+	ret = devm_request_irq(dev, ret, rockchip_sfc_irq_handler,
+			       0, pdev->name, sfc);
+	if (ret) {
+		dev_err(dev, "Failed to request irq\n");
+		goto err_irq;
+	}
+
+	sfc->num_chip = 0;
+	ret = rockchip_sfc_init(sfc);
+	if (ret)
+		goto err_irq;
+
+	ret = rockchip_sfc_register_all(sfc);
+	if (ret)
+		goto err_irq;
+
+	ret = devm_spi_register_master(dev, master);
+	if (ret)
+		goto err_irq;
+
+	return 0;
+
+err_irq:
+	clk_disable_unprepare(sfc->clk);
+err_clk:
+	clk_disable_unprepare(sfc->hclk);
+err_hclk:
+	return ret;
+}
+
+static int rockchip_sfc_remove(struct platform_device *pdev)
+{
+	struct rockchip_sfc *sfc = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(sfc->clk);
+	clk_disable_unprepare(sfc->hclk);
+	return 0;
+}
+
+static const struct of_device_id rockchip_sfc_dt_ids[] = {
+	{ .compatible = "rockchip,rk3036-sfc"},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rockchip_sfc_dt_ids);
+
+static struct platform_driver rockchip_sfc_driver = {
+	.driver = {
+		.name	= "rockchip-sfc",
+		.of_match_table = rockchip_sfc_dt_ids,
+	},
+	.probe	= rockchip_sfc_probe,
+	.remove	= rockchip_sfc_remove,
+};
+module_platform_driver(rockchip_sfc_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Rockchip Serial Flash Controller Driver");
+MODULE_AUTHOR("Shawn Lin <shawn.lin@rock-chips.com>");
-- 
2.25.1


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[PATCH v3 3/4] arm64: dts: rockchip: Add SFC to PX30

[Chris Morgan]

From: Chris Morgan <macromorgan@hotmail.com>

Add a devicetree entry for the Rockchip SFC for the PX30 SOC.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
---
 arch/arm64/boot/dts/rockchip/px30.dtsi | 38 ++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/px30.dtsi b/arch/arm64/boot/dts/rockchip/px30.dtsi
index 09baa8a167ce..1f4feb53e270 100644
--- a/arch/arm64/boot/dts/rockchip/px30.dtsi
+++ b/arch/arm64/boot/dts/rockchip/px30.dtsi
@@ -966,6 +966,18 @@ emmc: mmc@ff390000 {
 		status = "disabled";
 	};
 
+	sfc: spi@ff3a0000 {
+		compatible = "rockchip,px30-sfc","rockchip,rk3036-sfc";
+		reg = <0x0 0xff3a0000 0x0 0x4000>;
+		interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cru SCLK_SFC>, <&cru HCLK_SFC>;
+		clock-names = "sfc", "ahb";
+		pinctrl-0 = <&sfc_clk &sfc_cs &sfc_bus4>;
+		pinctrl-names = "default";
+		power-domains = <&power PX30_PD_MMC_NAND>;
+		status = "disabled";
+	};
+
 	nfc: nand-controller@ff3b0000 {
 		compatible = "rockchip,px30-nfc";
 		reg = <0x0 0xff3b0000 0x0 0x4000>;
@@ -1967,6 +1979,32 @@ flash_bus8: flash-bus8 {
 			};
 		};
 
+		serial_flash {
+			sfc_bus4: sfc-bus4 {
+				rockchip,pins =
+					<1 RK_PA0 3 &pcfg_pull_none>,
+					<1 RK_PA1 3 &pcfg_pull_none>,
+					<1 RK_PA2 3 &pcfg_pull_none>,
+					<1 RK_PA3 3 &pcfg_pull_none>;
+			};
+
+			sfc_bus2: sfc-bus2 {
+				rockchip,pins =
+					<1 RK_PA0 3 &pcfg_pull_none>,
+					<1 RK_PA1 3 &pcfg_pull_none>;
+			};
+
+			sfc_cs: sfc-cs {
+				rockchip,pins =
+					<1 RK_PA4 3 &pcfg_pull_none>;
+			};
+
+			sfc_clk: sfc-clk {
+				rockchip,pins =
+					<1 RK_PB1 3 &pcfg_pull_none>;
+			};
+		};
+
 		lcdc {
 			lcdc_rgb_dclk_pin: lcdc-rgb-dclk-pin {
 				rockchip,pins =
-- 
2.25.1


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[PATCH v4 4/4] arm64: dts: rockchip: Enable SFC for Odroid Go Advance

[Chris Morgan]

From: Chris Morgan <macromorgan@hotmail.com>

This enables the Rockchip Serial Flash Controller for the Odroid Go
Advance. Note that while the attached SPI NOR flash and the controller
both support quad read mode, only 2 of the required 4 pins are present.
The rx and tx bus width is set to 2 for this reason.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
---
 .../boot/dts/rockchip/rk3326-odroid-go2.dts      | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts b/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts
index 49c97f76df77..46f1d2f356cc 100644
--- a/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts
@@ -484,6 +484,22 @@ &sdmmc {
 	status = "okay";
 };
 
+&sfc {
+	pinctrl-0 = <&sfc_clk &sfc_cs &sfc_bus2>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		spi-max-frequency = <108000000>;
+		reg = <0>;
+		spi-rx-bus-width = <2>;
+		spi-tx-bus-width = <2>;
+	};
+};
+
 &tsadc {
 	status = "okay";
 };
-- 
2.25.1


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Re: [PATCH v3 1/4] dt-bindings: rockchip-sfc: Bindings for Rockchip serial flash controller

[Johan Jonker]

Hi Chris,

Some comments. Have a look if it's useful.

===
About the title:

dt-bindings: spi: add Rockchip Serial Flash Controller

Include a driver group name.
Start with a verb.
No need to mention "bindings" twice.

===

In order to get this patch reviewed by rob+dt you must include:
devicetree@vger.kernel.org

Check your review status here:
https://patchwork.ozlabs.org/project/devicetree-bindings/list/

Get the other lists and maintainers with:
./scripts/get_maintainer.pl --noroles --norolestats --nogit-fallback
--nogit <patch1> <patch2>

===

Check document with:

make ARCH=arm dt_binding_check
DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/rockchip-sfc.yaml

make ARCH=arm dtbs_check
DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/rockchip-sfc.yaml

make ARCH=arm64 dtbs_check
DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/rockchip-sfc.yaml

Remove any errors before submitting.

===

In this serie you are introducing 4 new compatible strings, then also
add 4 entries to dtsi files for the completeness.
Could you give us a complete package?

rockchip,px30-sfc
rockchip,rk3036-sfc
rockchip,rk3308-sfc
rockchip,rv1108-sfc

ARM: dts: rockchip: add sfc node for rv1108
Copy node from manufacturer tree in rv1108.dtsi

ARM: dts: rockchip: add sfc node for rk3036
https://github.com/rockchip-linux/kernel/commit/57bfc68e70cb58bd4786a6baff6315f252a19088

arm64: dts: rockchip: add sfc node for PX30

arm64: dts: rockchip: add sfc node for rk3308
https://github.com/rockchip-linux/kernel/commit/036e7e07a41c264a076c70ebf20cfeca031799a0

Fix there commit message and clock names.

===

Johan

On 6/1/21 10:10 PM, Chris Morgan wrote:
> From: Chris Morgan <macromorgan@hotmail.com>
> 
> Add bindings for the Rockchip serial flash controller. New device
> specific parameter of rockchip,sfc-no-dma included in documentation.
> 
> Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
> ---
>  .../devicetree/bindings/spi/rockchip,sfc.yaml | 87 +++++++++++++++++++
>  1 file changed, 87 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/spi/rockchip,sfc.yaml
> 

> diff --git a/Documentation/devicetree/bindings/spi/rockchip,sfc.yaml b/Documentation/devicetree/bindings/spi/rockchip,sfc.yaml
> new file mode 100644
> index 000000000000..d5f8edd621ae
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/rockchip,sfc.yaml
> @@ -0,0 +1,87 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/spi/rockchip,sfc.yaml#

rockchip-sfc.yaml

The comma is only used between <manufacturer>,<SoC name>-<function> I think.
Ask a maintainer for exact name.


> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Rockchip Serial Flash Controller (SFC)
> +
> +maintainers:

> +  - Heiko Stuebner <heiko@sntech.de>
> +  - Chris Morgan <macromorgan@hotmail.com>

sort
no hotmail because it screws the message-ID

> +
> +allOf:
> +  - $ref: spi-controller.yaml#
> +
> +properties:
> +  compatible:

> +    oneOf:

This format is wrong. Use fall back strings.

> +      - const: rockchip,px30-sfc

> +      - const: rockchip,rk1806-sfc
> +      - const: rockchip,rk1808-sfc
> +      - const: rockchip,rk312x-sfc

remove
I would advice against introducing compatible strings for boards that we
don't have support for in mainline. Limit to things that we know what
they look like.

> +      - const: rockchip,rk3308-sfc
> +      - const: rockchip,rv1108-sfc
> +      - items:
> +          - const: rockchip,rk3036-sfc

    oneOf:
      - const: rockchip,rk3036-sfc
      - items:
          - enum:
              - rockchip,px30-sfc
              - rockchip,rk3308-sfc
              - rockchip,rv1108-sfc
          - const: rockchip,rk3036-sfc

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:

> +      - description: Bus Clock
> +      - description: Module Clock

swap

> +
> +  clock-names:
> +    items:

> +      - const: ahb
> +      - const: sfc

swap
You must keep them in the same order as in your example and in the dtsi
files (both mainline as manufacturer tree).

Maybe use this:

      - const: clk
      - const: hclk


#define HCLK_SFC		257
#define SCLK_SFC		58

	COMPOSITE(SCLK_SFC, "clk_sfc", mux_gpll_cpll_p, 0,
			PX30_CLKSEL_CON(22), 7, 1, MFLAGS, 0, 7, DFLAGS,
			PX30_CLKGATE_CON(6), 7, GFLAGS),

	GATE(HCLK_SFC, "hclk_sfc", "hclk_mmc_nand", 0, PX30_CLKGATE_CON(6), 11,
GFLAGS),

===

From clk-rk3036.c:

	COMPOSITE(SCLK_SFC, "sclk_sfc", mux_pll_src_apll_dpll_gpll_usb480m_p, 0,
			RK2928_CLKSEL_CON(16), 0, 2, MFLAGS, 2, 5, DFLAGS,
			RK2928_CLKGATE_CON(10), 5, GFLAGS),


	GATE(0, "hclk_sfc", "hclk_peri", CLK_IGNORE_UNUSED,
RK2928_CLKGATE_CON(3), 14, GFLAGS),

The HCLK_SFC is missing and ignored in rk3036-cru.h and clk-rk3036.c
Maybe this needs a fix?

#define HCLK_SFC		454

See:
clk: rockchip: rk3036: export the sfc clocks
https://github.com/rockchip-linux/kernel/commit/8373cf713ddd32037dc86462cac2d2d3cc859a99

Maybe add more patches to your serie? ;)

===

> +
> +  power-domains:
> +    maxItems: 1
> +
> +  rockchip,sfc-no-dma:

> +    vendor,bool-property:

remove
See example vendor,bool-property at:
Documentation/devicetree/bindings/example-schema.yaml

> +      descrption: Boolean value for disabling DMA

description:

> +      type: boolean
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/px30-cru.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>

    #include <dt-bindings/power/px30-power.h>

> +
> +    sfc: spi@ff3a0000 {
> +        compatible = "rockchip,px30-sfc","rockchip,rk3036-sfc";
> +        reg = <0x0 0xff3a0000 0x0 0x4000>;
> +        interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
> +        clocks = <&cru SCLK_SFC>, <&cru HCLK_SFC>;
> +        clock-names = "sfc", "ahb";
> +        pinctrl-0 = <&sfc_clk &sfc_cs &sfc_bus2>;
> +        pinctrl-names = "default";

> +        power-domains = <&power PX30_PD_MMC_NAND>;

Add include for PX30_PD_MMC_NAND.

Check your example with scripts before you submit!

> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +

> +        flash@0 {

This controller handles only serial flash for now.
So limit that with patternProperties.
Also users can't add more then 4 subnodes.
That's where these documents are for, so add!


> +            compatible = "jedec,spi-nor";

> +            reg = <0>;

            spi-max-frequency = <108000000>;

> +            spi-rx-bus-width = <2>;
> +            spi-tx-bus-width = <2>;

The sort order is:
compatible
reg
interrupts
the rest in alphabetical order
(no status in YAML examples)


> +        };
> +    };
> +
> +...
> 

______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

Re: [PATCH v3 1/4] dt-bindings: rockchip-sfc: Bindings for Rockchip serial flash controller

[Chris Morgan]

On Wed, Jun 02, 2021 at 10:13:35AM +0200, Johan Jonker wrote:
> Hi Chris,
> 
> Some comments. Have a look if it's useful.
> 

All comments are useful. Thank you for your input. :)

> ===
> About the title:
> 
> dt-bindings: spi: add Rockchip Serial Flash Controller
> 
> Include a driver group name.
> Start with a verb.
> No need to mention "bindings" twice.
> 
> ===
> 
> In order to get this patch reviewed by rob+dt you must include:
> devicetree@vger.kernel.org
> 
> Check your review status here:
> https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatchwork.ozlabs.org%2Fproject%2Fdevicetree-bindings%2Flist%2F&data=04%7C01%7C%7Cbadb9f60f0114af4d80308d9259e53f6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637582184210841031%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=KhqRF2ly0Smf%2F1aE7yTrJ4FO5XPldagRW1gI8RF515E%3D&reserved=0
> 
> Get the other lists and maintainers with:
> ./scripts/get_maintainer.pl --noroles --norolestats --nogit-fallback
> --nogit <patch1> <patch2>

Thank you, for now I've just been using the get_maintainer.pl and trying
not to bother too many people. I'll do this though going forward.

> 
> ===
> 
> Check document with:
> 
> make ARCH=arm dt_binding_check
> DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/rockchip-sfc.yaml
> 
> make ARCH=arm dtbs_check
> DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/rockchip-sfc.yaml
> 
> make ARCH=arm64 dtbs_check
> DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/rockchip-sfc.yaml
> 
> Remove any errors before submitting.
> 
> ===
> 
> In this serie you are introducing 4 new compatible strings, then also
> add 4 entries to dtsi files for the completeness.
> Could you give us a complete package?
> 
> rockchip,px30-sfc
> rockchip,rk3036-sfc
> rockchip,rk3308-sfc
> rockchip,rv1108-sfc
> 

Excluding the px30 I will not be able to test these. Should I just update
the compatible strings and clock names then?

> ARM: dts: rockchip: add sfc node for rv1108
> Copy node from manufacturer tree in rv1108.dtsi
> 
> ARM: dts: rockchip: add sfc node for rk3036
> https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Frockchip-linux%2Fkernel%2Fcommit%2F57bfc68e70cb58bd4786a6baff6315f252a19088&amp;data=04%7C01%7C%7Cbadb9f60f0114af4d80308d9259e53f6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637582184210841031%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=C5k6bCkt8qlzOquK9rECDN9fTK6HQDzxTR4Vp4othtA%3D&amp;reserved=0
> 
> arm64: dts: rockchip: add sfc node for PX30
> 
> arm64: dts: rockchip: add sfc node for rk3308
> https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Frockchip-linux%2Fkernel%2Fcommit%2F036e7e07a41c264a076c70ebf20cfeca031799a0&amp;data=04%7C01%7C%7Cbadb9f60f0114af4d80308d9259e53f6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637582184210841031%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=NAdFO27S6zQdSjG%2FHMdZfe%2Bx9Nh9VQJhGVAhTopFY7s%3D&amp;reserved=0
> 
> Fix there commit message and clock names.
> 
> ===
> 
> Johan
> 
> On 6/1/21 10:10 PM, Chris Morgan wrote:
> > From: Chris Morgan <macromorgan@hotmail.com>
> > 
> > Add bindings for the Rockchip serial flash controller. New device
> > specific parameter of rockchip,sfc-no-dma included in documentation.
> > 
> > Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
> > ---
> >  .../devicetree/bindings/spi/rockchip,sfc.yaml | 87 +++++++++++++++++++
> >  1 file changed, 87 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/spi/rockchip,sfc.yaml
> > 
> 
> > diff --git a/Documentation/devicetree/bindings/spi/rockchip,sfc.yaml b/Documentation/devicetree/bindings/spi/rockchip,sfc.yaml
> > new file mode 100644
> > index 000000000000..d5f8edd621ae
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/spi/rockchip,sfc.yaml
> > @@ -0,0 +1,87 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevicetree.org%2Fschemas%2Fspi%2Frockchip%2Csfc.yaml%23&amp;data=04%7C01%7C%7Cbadb9f60f0114af4d80308d9259e53f6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637582184210841031%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=RvUO4cmMOZb9B5l2MtUK3riDKebGLlKWt0KnnKaqENQ%3D&amp;reserved=0
> 
> rockchip-sfc.yaml
> 
> The comma is only used between <manufacturer>,<SoC name>-<function> I think.
> Ask a maintainer for exact name.

I was basing this off of names like renesas,rspi.yaml and cdns,qspi-nor.yaml,
but this is probably a good question for the maintainers.

> 
> 
> > +$schema: https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevicetree.org%2Fmeta-schemas%2Fcore.yaml%23&amp;data=04%7C01%7C%7Cbadb9f60f0114af4d80308d9259e53f6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637582184210841031%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=OSRmMArQEVaWsZ%2BnxrqvfmO1pWk6dyjWVTunbw6j1Po%3D&amp;reserved=0
> > +
> > +title: Rockchip Serial Flash Controller (SFC)
> > +
> > +maintainers:
> 
> > +  - Heiko Stuebner <heiko@sntech.de>
> > +  - Chris Morgan <macromorgan@hotmail.com>
> 
> sort
> no hotmail because it screws the message-ID

Is that a hard and fast rule? The Hotmail address I will be able to
respond to much quicker. I've actually had that address since before
they got bought by Microsoft. Worst case I can do the gmail I submit
patches from, though, but Hotmail is still preferred by me.

> 
> > +
> > +allOf:
> > +  - $ref: spi-controller.yaml#
> > +
> > +properties:
> > +  compatible:
> 
> > +    oneOf:
> 
> This format is wrong. Use fall back strings.
> 

Thank you, I was confused on this one section. I'll try to clean it up
more.

> > +      - const: rockchip,px30-sfc
> 
> > +      - const: rockchip,rk1806-sfc
> > +      - const: rockchip,rk1808-sfc
> > +      - const: rockchip,rk312x-sfc
> 
> remove
> I would advice against introducing compatible strings for boards that we
> don't have support for in mainline. Limit to things that we know what
> they look like.

I was under the impression these were also supported by upstream, but I'll
remove them if they aren't.

> 
> > +      - const: rockchip,rk3308-sfc
> > +      - const: rockchip,rv1108-sfc
> > +      - items:
> > +          - const: rockchip,rk3036-sfc
> 
>     oneOf:
>       - const: rockchip,rk3036-sfc
>       - items:
>           - enum:
>               - rockchip,px30-sfc
>               - rockchip,rk3308-sfc
>               - rockchip,rv1108-sfc
>           - const: rockchip,rk3036-sfc
> 
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    items:
> 
> > +      - description: Bus Clock
> > +      - description: Module Clock
> 
> swap
> 
> > +
> > +  clock-names:
> > +    items:
> 
> > +      - const: ahb
> > +      - const: sfc
> 
> swap
> You must keep them in the same order as in your example and in the dtsi
> files (both mainline as manufacturer tree).
> 
> Maybe use this:
> 
>       - const: clk
>       - const: hclk

Heiko suggested we use clk and ahb as the clock names, to be consistent
with the NAND flash controller hardware.

> 
> 
> #define HCLK_SFC		257
> #define SCLK_SFC		58
> 
> 	COMPOSITE(SCLK_SFC, "clk_sfc", mux_gpll_cpll_p, 0,
> 			PX30_CLKSEL_CON(22), 7, 1, MFLAGS, 0, 7, DFLAGS,
> 			PX30_CLKGATE_CON(6), 7, GFLAGS),
> 
> 	GATE(HCLK_SFC, "hclk_sfc", "hclk_mmc_nand", 0, PX30_CLKGATE_CON(6), 11,
> GFLAGS),
> 
> ===
> 
> From clk-rk3036.c:
> 
> 	COMPOSITE(SCLK_SFC, "sclk_sfc", mux_pll_src_apll_dpll_gpll_usb480m_p, 0,
> 			RK2928_CLKSEL_CON(16), 0, 2, MFLAGS, 2, 5, DFLAGS,
> 			RK2928_CLKGATE_CON(10), 5, GFLAGS),
> 
> 
> 	GATE(0, "hclk_sfc", "hclk_peri", CLK_IGNORE_UNUSED,
> RK2928_CLKGATE_CON(3), 14, GFLAGS),
> 
> The HCLK_SFC is missing and ignored in rk3036-cru.h and clk-rk3036.c
> Maybe this needs a fix?

It possibly does, but aside from hoping that I'm doing it right I lack the
necessary hardware to test the changes. I can make educated guesses though
by looking at the datasheet and board support package kernel.

> 
> #define HCLK_SFC		454
> 
> See:
> clk: rockchip: rk3036: export the sfc clocks
> https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Frockchip-linux%2Fkernel%2Fcommit%2F8373cf713ddd32037dc86462cac2d2d3cc859a99&amp;data=04%7C01%7C%7Cbadb9f60f0114af4d80308d9259e53f6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637582184210851028%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=KZiR3s3opSYS6uplRJ%2B726qiFWY5tEfvo6GKAp4w81A%3D&amp;reserved=0
> 
> Maybe add more patches to your serie? ;)
> 
> ===
> 
> > +
> > +  power-domains:
> > +    maxItems: 1
> > +
> > +  rockchip,sfc-no-dma:
> 
> > +    vendor,bool-property:
> 
> remove
> See example vendor,bool-property at:
> Documentation/devicetree/bindings/example-schema.yaml
> 
> > +      descrption: Boolean value for disabling DMA
> 
> description:
> 
> > +      type: boolean
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - clocks
> > +  - clock-names
> > +
> > +unevaluatedProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/clock/px30-cru.h>
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> 
>     #include <dt-bindings/power/px30-power.h>
> 
> > +
> > +    sfc: spi@ff3a0000 {
> > +        compatible = "rockchip,px30-sfc","rockchip,rk3036-sfc";
> > +        reg = <0x0 0xff3a0000 0x0 0x4000>;
> > +        interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
> > +        clocks = <&cru SCLK_SFC>, <&cru HCLK_SFC>;
> > +        clock-names = "sfc", "ahb";
> > +        pinctrl-0 = <&sfc_clk &sfc_cs &sfc_bus2>;
> > +        pinctrl-names = "default";
> 
> > +        power-domains = <&power PX30_PD_MMC_NAND>;
> 
> Add include for PX30_PD_MMC_NAND.
> 
> Check your example with scripts before you submit!
> 
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> 
> > +        flash@0 {
> 
> This controller handles only serial flash for now.
> So limit that with patternProperties.
> Also users can't add more then 4 subnodes.
> That's where these documents are for, so add!
> 
> 
> > +            compatible = "jedec,spi-nor";
> 
> > +            reg = <0>;
> 
>             spi-max-frequency = <108000000>;
> 
> > +            spi-rx-bus-width = <2>;
> > +            spi-tx-bus-width = <2>;
> 
> The sort order is:
> compatible
> reg
> interrupts
> the rest in alphabetical order
> (no status in YAML examples)
> 
> 
> > +        };
> > +    };
> > +
> > +...
> > 

______________________________________________________
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Re: [PATCH v3 2/4] spi: rockchip-sfc: add rockchip serial flash controller driver

[Mark Brown]

[-- Attachment #1.1: Type: text/plain, Size: 2716 bytes --]

On Tue, Jun 01, 2021 at 03:10:19PM -0500, Chris Morgan wrote:

This looks mostly good, a few mostly minor comments below:

> @@ -0,0 +1,861 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Rockchip Serial Flash Controller Driver

Please make the entire comment a C++ one to make things look more
intentional.

> +static int rockchip_sfc_get_if_type(const struct spi_mem_op *op,
> +				    struct rockchip_sfc *sfc)
> +{
> +	if (op->data.buswidth == 2)
> +		return IF_TYPE_DUAL;
> +	else if (op->data.buswidth == 4)
> +		return IF_TYPE_QUAD;
> +	else if (op->data.buswidth == 1)
> +		return IF_TYPE_STD;
> +
> +	dev_err(sfc->dev, "unsupported SPI read mode\n");
> +
> +	return -EINVAL;
> +}

This would be more idiomatically implemented as a switch statement.

> +static int rockchip_sfc_wait_fifo_ready(struct rockchip_sfc *sfc, int wr, u32 timeout)
> +{
> +	unsigned long deadline = jiffies + timeout;
> +	int level;
> +
> +	while (!(level = rockchip_sfc_get_fifo_level(sfc, wr))) {
> +		if (time_after_eq(jiffies, deadline)) {
> +			dev_warn(sfc->dev, "%s fifo timeout\n", wr ? "write" : "read");
> +			return -ETIMEDOUT;
> +		}
> +		udelay(1);
> +	}
> +
> +	return level;

The use of the assignment in the while conditional makes it hard to tell
if this code is doing what was intended.

> +static int rockchip_sfc_write_fifo(struct rockchip_sfc *sfc, const u8 *buf, int len)
> +{
> +	u8 bytes = len & 0x3;
> +	u32 dwords;
> +	int tx_level;
> +	u32 write_words;
> +	u32 tmp = 0;
> +
> +	dwords = len >> 2;
> +	while (dwords) {
> +		tx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_WR, HZ);
> +		if (tx_level < 0)
> +			return tx_level;
> +		write_words = min_t(u32, tx_level, dwords);
> +		iowrite32_rep(sfc->regbase + SFC_DATA, buf, write_words);
> +		buf += write_words << 2;
> +		dwords -= write_words;
> +		}

Weird indentation on the } here.

> +	/* write the rest non word aligned bytes */
> +	if (bytes) {
> +		tx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_WR, HZ);

It's not the source buffer being aligned that's the issue here, it's the
buffer not being a multiple of word size.

> +static irqreturn_t rockchip_sfc_irq_handler(int irq, void *dev_id)
> +{
> +	struct rockchip_sfc *sfc = dev_id;
> +	u32 reg;
> +
> +	reg = readl(sfc->regbase + SFC_RISR);
> +
> +	/* Clear interrupt */
> +	writel_relaxed(reg, sfc->regbase + SFC_ICLR);
> +
> +	if (reg & SFC_RISR_TRAN_FINISH)
> +		complete(&sfc->cp);
> +
> +	return IRQ_HANDLED;
> +}

This will silently clear any unknown interrupt, and silently claim to
have handled an interrupt even if none happened (eg, due to shared IRQs)
- it would be better to only ack interrupts we handle and return
IRQ_NONE if we didn't handle any.

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