Re: [PATCH 3/3] SPI: Ingenic: Add SFC support for Ingenic SoCs.

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Hi Zhou,
Le dim., juil. 24 2022 at 01:26:56 +0800, Zhou Yanjie <zhouyanjie@xxxxxxxxxxxxxx> a écrit : 
Hi Paul,

On 2022/7/23 上午4:03, Paul Cercueil wrote:

Hi Zhou,
Le sam., juil. 23 2022 at 00:48:30 +0800, 周琰杰 (Zhou Yanjie) <zhouyanjie@xxxxxxxxxxxxxx> a écrit : 
Add SFC support for the X1000 SoC, the X1600 SoC, and the X2000 SoC
from Ingenic.

Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@xxxxxxxxxxxxxx>
---
 drivers/spi/Kconfig           |   9 +
 drivers/spi/Makefile          |   1 +
drivers/spi/spi-ingenic-sfc.c | 662 ++++++++++++++++++++++++++++++++++++++++++ 
 3 files changed, 672 insertions(+)
 create mode 100644 drivers/spi/spi-ingenic-sfc.c

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 3b1044e..1077bd3 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -437,6 +437,15 @@ config SPI_INGENIC
       To compile this driver as a module, choose M here: the module
       will be called spi-ingenic.

+config SPI_INGENIC_SFC
+    tristate "Ingenic SoCs SPI Flash Controller"
+    depends on MACH_INGENIC || COMPILE_TEST
+    help
+ This enables support for the Ingenic SoCs SPI flash controller. 
+
+      To compile this driver as a module, choose M here: the module
+      will be called ingenic-sfc.
+
 config SPI_INTEL
     tristate

diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 0f44eb6..f3e42c0 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -62,6 +62,7 @@ obj-$(CONFIG_SPI_HISI_SFC_V3XX) += spi-hisi-sfc-v3xx.o 
 obj-$(CONFIG_SPI_IMG_SPFI)        += spi-img-spfi.o
 obj-$(CONFIG_SPI_IMX)            += spi-imx.o
 obj-$(CONFIG_SPI_INGENIC)        += spi-ingenic.o
+obj-$(CONFIG_SPI_INGENIC_SFC)    += spi-ingenic-sfc.o
 obj-$(CONFIG_SPI_INTEL)            += spi-intel.o
 obj-$(CONFIG_SPI_INTEL_PCI)        += spi-intel-pci.o
 obj-$(CONFIG_SPI_INTEL_PLATFORM)    += spi-intel-platform.o
diff --git a/drivers/spi/spi-ingenic-sfc.c b/drivers/spi/spi-ingenic-sfc.c 
new file mode 100644
index 00000000..a565546
--- /dev/null
+++ b/drivers/spi/spi-ingenic-sfc.c
@@ -0,0 +1,662 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)


Dual-license driver? That's not what MODULE_LICENSE() says.
My fault, forgot to modify MODULE_LICENSE(), will fix it in the next version. 



+/*
+ * Ingenic SoCs SPI Flash Controller Driver
+ * Copyright (c) 2022 周琰杰 (Zhou Yanjie) <zhouyanjie@xxxxxxxxxxxxxx> 
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi-mem.h>
+
+/* SFC register offsets */
+#define SFC_REG_GLB                        0x0000
+#define SFC_REG_DEV_CONF                0x0004
+#define SFC_REG_DEV_STA_EXP                0x0008
+#define SFC_REG_DEV_STA_RT                0x000c
+#define SFC_REG_DEV_STA_MSK                0x0010
+#define SFC_REG_TRAN_CONF(n)            (0x0014 + n * 4)
+#define SFC_REG_TRAN_CFG0(n)            (0x0014 + n * 4)
You should protect the macro parameter. If you do for instance SFC_REG_TRAN_CONF(x + 1) it would resolve to (0x0014 + x + 1 * 4) which is not what you'd want. 



Sure, will fix it.
Also - looks like SFC_REG_TRAN_CONF() and SFC_REG_TRAN_CFG0() are the same thing, that's on purpose? 


+#define SFC_REG_TRAN_LEN 0x002c
+#define SFC_REG_DEV_ADDR(n)                (0x0030 + n * 4)
+#define SFC_REG_DEV_ADDR_PLUS(n)        (0x0048 + n * 4)
+#define SFC_REG_MEM_ADDR                0x0060
+#define SFC_REG_TRIG                    0x0064
+#define SFC_REG_SR                        0x0068
+#define SFC_REG_SCR                        0x006c
+#define SFC_REG_INTC                    0x0070
+#define SFC_REG_FSM                        0x0074
+#define SFC_REG_CGE                        0x0078
+#define SFC_REG_TRAN_CFG1(n)            (0x009c + n * 4)
+#define SFC_REG_DR                        0x1000
+
+/* bits within the GLB register */
+#define GLB_TRAN_DIR_MASK                GENMASK(13, 13)
+#define GLB_TRAN_DIR_WRITE                0x1
+#define GLB_TRAN_DIR_READ                0x0


When it's a single bit - just use BIT().



Sure.





+#define GLB_THRESHOLD_MASK GENMASK(12, 7)
+#define GLB_OP_MODE_MASK                GENMASK(6, 6)


Same here, and I see it a few times below as well.



Sure.



+#define GLB_OP_MODE_DMA                    0x1
+#define GLB_OP_MODE_SLAVE                0x0
+#define GLB_PHASE_NUM_MASK                GENMASK(5, 3)
+#define GLB_WP_EN                        BIT(2)
+#define GLB_BURST_MD_MASK                GENMASK(1, 0)
+#define GLB_BURST_MD_INCR32                0x3
+#define GLB_BURST_MD_INCR16                0x2
+#define GLB_BURST_MD_INCR8                0x1
+#define GLB_BURST_MD_INCR4                0x0
+
+/* bits within the DEV_CONF register */
+#define DEV_CONF_SMP_DELAY_MASK            GENMASK(20, 16)
+#define DEV_CONF_SMP_DELAY_180DEG        0x4
+#define DEV_CONF_SMP_DELAY_HALF_CYCLE    0x1
+#define DEV_CONF_CMD_TYPE_MASK            GENMASK(15, 15)
+#define DEV_CONF_CMD_TYPE_16BIT            0x1
+#define DEV_CONF_CMD_TYPE_8BIT            0x0
+#define DEV_CONF_STA_TYPE_MASK            GENMASK(14, 13)
+#define DEV_CONF_THOLD_MASK                GENMASK(12, 11)
+#define DEV_CONF_TSETUP_MASK            GENMASK(10, 9)
+#define DEV_CONF_TSH_MASK                GENMASK(8, 5)
+#define DEV_CONF_CPHA                    BIT(4)
+#define DEV_CONF_CPOL                    BIT(3)
+#define DEV_CONF_CE_DL                    BIT(2)
+#define DEV_CONF_HOLD_DL                BIT(1)
+#define DEV_CONF_WP_DL                    BIT(0)
+
+/* bits within the TRAN_CONF(n) register */
+#define TRAN_CONF_TRAN_MODE_MASK        GENMASK(31, 29)
+#define TRAN_CONF_ADDR_WIDTH_MASK        GENMASK(28, 26)
+#define TRAN_CONF_POLL_EN                BIT(25)
+#define TRAN_CONF_CMD_EN                BIT(24)
+#define TRAN_CONF_PHASE_FORMAT_MASK        GENMASK(23, 23)
+#define TRAN_CONF_DMY_BITS_MASK            GENMASK(22, 17)
+#define TRAN_CONF_DATA_EN                BIT(16)
+#define TRAN_CONF_CMD_MASK                GENMASK(15, 0)
+
+/* bits within the TRIG register */
+#define TRIG_FLUSH                        BIT(2)
+#define TRIG_STOP                        BIT(1)
+#define TRIG_START                        BIT(0)
+
+/* bits within the SR register */
+#define SR_FIFO_NUM_MASK                GENMASK(22, 16)
+#define SR_END                            BIT(4)
+#define SR_TRAN_REQ                        BIT(3)
+#define SR_RECE_REQ                        BIT(2)
+#define SR_OVER                            BIT(1)
+#define SR_UNDER                        BIT(0)
+
+/* bits within the SCR register */
+#define SCR_CLR_END                        BIT(4)
+#define SCR_CLR_TREQ                    BIT(3)
+#define SCR_CLR_RREQ                    BIT(2)
+#define SCR_CLR_OVER                    BIT(1)
+#define SCR_CLR_UNDER                    BIT(0)
+
+/* bits within the INTC register */
+#define INTC_MASK_END                    BIT(4)
+#define INTC_MASK_TREQ                    BIT(3)
+#define INTC_MASK_RREQ                    BIT(2)
+#define INTC_MASK_OVER                    BIT(1)
+#define INTC_MASK_UNDER                    BIT(0)
+
+/* bits within the TRAN_CFG1(n) register */
+#define TRAN_CFG1_TRAN_MODE_MASK        GENMASK(7, 4)
+
+#define TRAN_MODE_STANDARD                0
+#define TRAN_MODE_DUAL_DATA                1
+#define TRAN_MODE_DUAL_IO                2
+#define TRAN_MODE_DUAL_FULL                3
+#define TRAN_MODE_QUAD_DATA                5
+#define TRAN_MODE_QUAD_IO                6
+#define TRAN_MODE_QUAD_FULL                7
+#define TRAN_MODE_OCTAL_DATA            9
+#define TRAN_MODE_OCTAL_IO                10
+#define TRAN_MODE_OCTAL_FULL            11
+
+#define INGENIC_SFC_FIFO_SIZE            (64 * 4)
+
+#define INGENIC_SFC_TRANSFER_TIMEOUT    1000
Maybe add the unit name in the macro as well - INGENIC_SFC_TRANSFER_TIMEOUT_MS. 


Sure.





+
+enum ingenic_sfc_version {
+    ID_X1000,
+    ID_X1600,
+    ID_X2000,
+};
+
+struct ingenic_soc_info {
+    enum ingenic_sfc_version version;
+
+    unsigned int max_bus_width;
+
+    const u32 tran_mode_mask;
+};
+
+struct ingenic_sfc {
+    const struct ingenic_soc_info *soc_info;
+
+    void __iomem *base;
+    struct device *dev;
+    struct clk *clk;
+    int irq;
+
+    struct completion completion;
+};
+
+static irqreturn_t ingenic_sfc_irq_handler(int irq, void *data)
+{
+    struct ingenic_sfc *sfc = data;
+
+    writel(0x1f, sfc->base + SFC_REG_INTC);
+
+    complete(&sfc->completion);
+
+    return IRQ_HANDLED;
+}
+
+static int ingenic_sfc_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) 
+{
+    uintptr_t addr = (uintptr_t)op->data.buf.in;
+
+ if (op->data.nbytes > INGENIC_SFC_FIFO_SIZE && !IS_ALIGNED(addr, 4)) 
+        op->data.nbytes = INGENIC_SFC_FIFO_SIZE;
+
+    return 0;
+}
+
+static bool ingenic_sfc_supports_op(struct spi_mem *mem, const struct spi_mem_op *op) 
+{
+    struct spi_device *spi = mem->spi;
+ struct ingenic_sfc *sfc = spi_controller_get_devdata(spi->master); 
+    uintptr_t addr = (uintptr_t)op->data.buf.in;
+
+ /* The controller only supports Standard SPI mode, Duall mode, Quad mode and Octal mode. */ 

Dual*



Oops, will fix it.





+    if (op->cmd.buswidth > sfc->soc_info->max_bus_width ||
+        op->addr.buswidth > sfc->soc_info->max_bus_width ||
+        op->dummy.buswidth > sfc->soc_info->max_bus_width ||
+        op->data.buswidth > sfc->soc_info->max_bus_width)
+        return false;
+
+    /* Max 32 dummy clock cycles supported */
+ if (op->dummy.nbytes && op->dummy.nbytes * 8 / op->dummy.buswidth > 32) 
+        return false;
+
+    /* Max rx data length, check controller limits and alignment */
+    if (op->data.dir == SPI_MEM_DATA_IN &&
+ op->data.nbytes > INGENIC_SFC_FIFO_SIZE && !IS_ALIGNED(addr, 4))
This does the same check than in ingenic_sfc_adjust_op_size(), maybe move it to a new inline function? 



Sure.



+        return false;
+
+    /* Max 6 bytes address width supported */
+    if (op->addr.nbytes > 6)
+        return false;
+
+    return spi_mem_default_supports_op(mem, op);
+}
+
+static void ingenic_sfc_set_transfer_mode(struct ingenic_sfc *sfc, const struct spi_mem_op *op) 
+{
+    int val;
+
+    val = readl(sfc->base + (sfc->soc_info->version >= ID_X1600 ?
+            SFC_REG_TRAN_CFG1(0) : SFC_REG_TRAN_CONF(0)));


As Krzysztof said - ugh.



Will fix it.
Also, instead of having a "version" enum in your soc_info, why not just have a "reg_conf" field that gives you directly the right register? 



We still need a version to distinguish the SFC before X1600 SoC and
the SFC after X1600 SoC, because in addition to the difference in the
cfg register, another difference is that the SFC before X1600 SoC does
not support address unaligned RX DMA transfer, while SFC in X1600 and
later SoCs can support this feature.


Then add a .dma_supports_unaligned_address field.







+    val &= ~sfc->soc_info->tran_mode_mask;
+    if (op->cmd.buswidth == 8)
+ val |= (TRAN_MODE_OCTAL_FULL << (ffs(sfc->soc_info->tran_mode_mask) - 1)) & 
+                sfc->soc_info->tran_mode_mask;


Looks like you're really trying to reinvent the wheel.
val |= FIELD_PREP(sfc->soc_info->tran_mode_mask, TRAN_MODE_OCTAL_FULL); 

using <linux/bitfield.h>.
Also, just define a 'mode' variable and set it in your if/else blocks, that would look much better. Then you can set val |= FIELD_PREP(..., mode) at the end. 


Sure, will change this in the next version.





+    else if (op->cmd.buswidth == 4)
+ val |= (TRAN_MODE_QUAD_FULL << (ffs(sfc->soc_info->tran_mode_mask) - 1)) & 
+                sfc->soc_info->tran_mode_mask;
+    else if (op->cmd.buswidth == 2)
+ val |= (TRAN_MODE_DUAL_FULL << (ffs(sfc->soc_info->tran_mode_mask) - 1)) & 
+                sfc->soc_info->tran_mode_mask;
+    else if (op->addr.buswidth == 8)
+ val |= (TRAN_MODE_OCTAL_IO << (ffs(sfc->soc_info->tran_mode_mask) - 1)) & 
+                sfc->soc_info->tran_mode_mask;
+    else if (op->addr.buswidth == 4)
+ val |= (TRAN_MODE_QUAD_IO << (ffs(sfc->soc_info->tran_mode_mask) - 1)) & 
+                sfc->soc_info->tran_mode_mask;
+    else if (op->addr.buswidth == 2)
+ val |= (TRAN_MODE_DUAL_IO << (ffs(sfc->soc_info->tran_mode_mask) - 1)) & 
+                sfc->soc_info->tran_mode_mask;
+    else if (op->data.buswidth == 8)
+ val |= (TRAN_MODE_OCTAL_DATA << (ffs(sfc->soc_info->tran_mode_mask) - 1)) & 
+                sfc->soc_info->tran_mode_mask;
+    else if (op->data.buswidth == 4)
+ val |= (TRAN_MODE_QUAD_DATA << (ffs(sfc->soc_info->tran_mode_mask) - 1)) & 
+                sfc->soc_info->tran_mode_mask;
+    else if (op->data.buswidth == 2)
+ val |= (TRAN_MODE_DUAL_DATA << (ffs(sfc->soc_info->tran_mode_mask) - 1)) & 
+                sfc->soc_info->tran_mode_mask;
+    else
+ val |= (TRAN_MODE_STANDARD << (ffs(sfc->soc_info->tran_mode_mask) - 1)) & 
+                sfc->soc_info->tran_mode_mask;
+    writel(val, sfc->base + (sfc->soc_info->version >= ID_X1600 ?
+            SFC_REG_TRAN_CFG1(0) : SFC_REG_TRAN_CONF(0)));
+}
+
+/*
+ * We only need PIO mode to handle the SPI_MEM_NO_DATA transfers,
+ * and the unaligned accesses in SPI_MEM_DATA_IN transfers.
+ */
+static void ingenic_sfc_read_rxfifo(struct ingenic_sfc *sfc, u8 *to, unsigned int len) 
+{
+    void __iomem *from;
+
+    from = sfc->base + SFC_REG_DR;
+
+    for (; len >= 4; len -= 4, to += 4) {
+        u32 val = __raw_readl(from);
+        memcpy(to, &val, 4);
No need to use memcpy for 4 bytes. You can do: put_unaligned(val, (u32 *)to); 



Sure.



+    }
+
+    if (len) {
+        u32 val = __raw_readl(from);
+        memcpy(to, &val, len);
Hmm, I'm not sure that is endian-safe. I would prefer if you copied byte by byte. 



Sure.



+    }
+}
+
+static int ingenic_sfc_exec_op_pio(struct ingenic_sfc *sfc, const struct spi_mem_op *op) 
+{
+    int ret, val;
+
+    val = readl(sfc->base + SFC_REG_GLB);
+    u32p_replace_bits(&val, GLB_TRAN_DIR_READ, GLB_TRAN_DIR_MASK);
+    u32p_replace_bits(&val, GLB_OP_MODE_SLAVE, GLB_OP_MODE_MASK);
+    writel(val, sfc->base + SFC_REG_GLB);


By the way, have you considered using regmap?
It would give you things like regmap_update_bits() for this kind of things, and regmap_field() to handle your conf register being at a different address across SoCs.
It seems that the overhead of using regmap will be greater than using readl and writel, the purpose of using readl and writel is to minimize overhead and maximize performance. :)
If you really think that this is a valid reason not to use regmap, then prove it with a benchmark, because I'm *very* doubtful about your claim. 

Cheers,
-Paul


+
+    val = TRAN_CONF_CMD_EN | op->cmd.opcode;
+
+    if (op->addr.nbytes > 0) {
+ val |= FIELD_PREP(TRAN_CONF_ADDR_WIDTH_MASK, op->addr.nbytes); 
+
+ writel(op->addr.val & 0xffffffff, sfc->base + SFC_REG_DEV_ADDR(0)); + writel(op->addr.val >> 32, sfc->base + SFC_REG_DEV_ADDR_PLUS(0)); 
+    }
+
+    if (op->dummy.nbytes > 0)
+        val |= FIELD_PREP(TRAN_CONF_DMY_BITS_MASK,
+                op->dummy.nbytes * 8 / op->dummy.buswidth);
+
+    if (op->data.nbytes > 0)
+        val |= TRAN_CONF_DATA_EN;
+
+    writel(val, sfc->base + SFC_REG_TRAN_CONF(0));
+    writel(op->data.nbytes, sfc->base + SFC_REG_TRAN_LEN);
+
+    ingenic_sfc_set_transfer_mode(sfc, op);
+
+    writel(0x1f, sfc->base + SFC_REG_SCR);


Random 0x1f value here, maybe use a macro?



Sure.
+ writel(~(INTC_MASK_END | INTC_MASK_RREQ), sfc->base + SFC_REG_INTC); 
+
+    writel(0, sfc->base + SFC_REG_MEM_ADDR);
+
+    writel(TRIG_FLUSH, sfc->base + SFC_REG_TRIG);
+    writel(TRIG_START, sfc->base + SFC_REG_TRIG);
+
+    ret = wait_for_completion_timeout(&sfc->completion,
+            msecs_to_jiffies(INGENIC_SFC_TRANSFER_TIMEOUT));
+    if (!ret) {
+        writel(0x1f, sfc->base + SFC_REG_INTC);
+        writel(0x1f, sfc->base + SFC_REG_SCR);
+ dev_err(sfc->dev, "line:%d Timeout for ACK from SFC device\n", __LINE__); 
+        return -ETIMEDOUT;
+    }
+
+    ingenic_sfc_read_rxfifo(sfc, op->data.buf.in, op->data.nbytes);
+ readl_poll_timeout(sfc->base + SFC_REG_SR, val, val & SR_END, 10, 0); 

Infinite timeout? Is that very wise?



Will fix it in the next version.





+
+ writel(INTC_MASK_END | INTC_MASK_RREQ, sfc->base + SFC_REG_SCR); 
+    writel(TRIG_STOP, sfc->base + SFC_REG_TRIG);
+
+    return 0;
+}
+
+static int ingenic_sfc_exec_op_dma(struct ingenic_sfc *sfc, const struct spi_mem_op *op) 
+{
+    dma_addr_t addr;
+    int ret, val;
+
+    val = readl(sfc->base + SFC_REG_GLB);
+    u32p_replace_bits(&val, op->data.dir == SPI_MEM_DATA_IN ?
+ GLB_TRAN_DIR_READ : GLB_TRAN_DIR_WRITE, GLB_TRAN_DIR_MASK); 
+    u32p_replace_bits(&val, GLB_OP_MODE_DMA, GLB_OP_MODE_MASK);
+    writel(val, sfc->base + SFC_REG_GLB);
+
+    val = TRAN_CONF_CMD_EN | op->cmd.opcode;
+
+    if (op->addr.nbytes > 0) {
+ val |= FIELD_PREP(TRAN_CONF_ADDR_WIDTH_MASK, op->addr.nbytes); + writel(op->addr.val & 0xffffffff, sfc->base + SFC_REG_DEV_ADDR(0)); + writel(op->addr.val >> 32, sfc->base + SFC_REG_DEV_ADDR_PLUS(0)); 
+    }
+
+    if (op->dummy.nbytes > 0)
+        val |= FIELD_PREP(TRAN_CONF_DMY_BITS_MASK,
+                op->dummy.nbytes * 8 / op->dummy.buswidth);
+
+    if (op->data.nbytes > 0)
+        val |= TRAN_CONF_DATA_EN;
There's a lot of code duplication here with ingenic_sfc_exec_op_pio(). A lot can be factorized. 


Sure, I will try to do it.





+
+    writel(val, sfc->base + SFC_REG_TRAN_CONF(0));
+    writel(op->data.nbytes, sfc->base + SFC_REG_TRAN_LEN);
+
+    ingenic_sfc_set_transfer_mode(sfc, op);
+
+    writel(0x1f, sfc->base + SFC_REG_SCR);
+    writel(~INTC_MASK_END, sfc->base + SFC_REG_INTC);
+
+    switch (op->data.dir) {
+    case SPI_MEM_DATA_IN:
+ addr = dma_map_single(sfc->dev, op->data.buf.in, op->data.nbytes, DMA_FROM_DEVICE); 
+        if (dma_mapping_error(sfc->dev, addr)) {
+            dev_err(sfc->dev, "RX DMA　memory not mapped\n");
+            return -ENOMEM;
+        }
+
+        writel(addr, sfc->base + SFC_REG_MEM_ADDR);
+        break;
+
+    case SPI_MEM_DATA_OUT:
+        addr = dma_map_single(sfc->dev, (void *)op->data.buf.out,
+                op->data.nbytes, DMA_TO_DEVICE);
+        if (dma_mapping_error(sfc->dev, addr)) {
+            dev_err(sfc->dev, "TX DMA　memory not mapped\n");
+            return -ENOMEM;
+        }
+
+        writel(addr, sfc->base + SFC_REG_MEM_ADDR);
+        break;
+
+    default:
+        return -EINVAL;
+    }
+
+    writel(TRIG_START, sfc->base + SFC_REG_TRIG);
+
+    ret = wait_for_completion_timeout(&sfc->completion,
+            msecs_to_jiffies(INGENIC_SFC_TRANSFER_TIMEOUT));
+    if (!ret) {
+        writel(0x1f, sfc->base + SFC_REG_INTC);
+        writel(0x1f, sfc->base + SFC_REG_SCR);
+ dev_err(sfc->dev, "line:%d Timeout for ACK from SFC device\n", __LINE__); 
+        return -ETIMEDOUT;
+    }
+
+    dma_unmap_single(sfc->dev, addr, op->data.nbytes,
+ op->data.dir == SPI_MEM_DATA_IN ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
Use a small inline function for that too. My personal rule is that ?: is fine if the line fits in 80 characters, but if you have to break, then you really need to move it somewhere else. 



Sure.



+
+    writel(INTC_MASK_END, sfc->base + SFC_REG_SCR);
+    writel(TRIG_STOP, sfc->base + SFC_REG_TRIG);
+
+    return 0;
+}
+
+static int ingenic_sfc_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) 
+{
+    struct spi_device *spi = mem->spi;
+ struct ingenic_sfc *sfc = spi_controller_get_devdata(spi->master); 
+    uintptr_t addr = (uintptr_t)op->data.buf.in;
+
+    init_completion(&sfc->completion);
+
+    switch (op->data.dir) {
+    case SPI_MEM_DATA_IN:
+ if (sfc->soc_info->version >= ID_X1600 || IS_ALIGNED(addr, 4)) 
+            break;
+
+        fallthrough;
+
+    case SPI_MEM_NO_DATA:
+        return ingenic_sfc_exec_op_pio(sfc, op);
+
+    default:
+        break;
+    }
+
+    return ingenic_sfc_exec_op_dma(sfc, op);
+}
+
+static int ingenic_sfc_poll_status(struct spi_mem *mem, const struct spi_mem_op *op, 
+            u16 mask, u16 match, unsigned long initial_delay_us,
+ unsigned long polling_delay_us, unsigned long timeout_ms) 
+{
+    struct spi_device *spi = mem->spi;
+ struct ingenic_sfc *sfc = spi_controller_get_devdata(spi->master); 
+    int ret, val;
+
+    init_completion(&sfc->completion);
+
+    val = readl(sfc->base + SFC_REG_GLB);
+    u32p_replace_bits(&val, GLB_TRAN_DIR_READ, GLB_TRAN_DIR_MASK);
+    u32p_replace_bits(&val, GLB_OP_MODE_SLAVE, GLB_OP_MODE_MASK);
+    writel(val, sfc->base + SFC_REG_GLB);
+
+    writel(match, sfc->base + SFC_REG_DEV_STA_EXP);
+    writel(mask, sfc->base + SFC_REG_DEV_STA_MSK);
+
+    val = TRAN_CONF_POLL_EN | TRAN_CONF_CMD_EN | op->cmd.opcode;
+
+    if (op->addr.nbytes > 0) {
+ val |= FIELD_PREP(TRAN_CONF_ADDR_WIDTH_MASK, op->addr.nbytes); 
+
+ writel(op->addr.val & 0xffffffff, sfc->base + SFC_REG_DEV_ADDR(0)); + writel(op->addr.val >> 32, sfc->base + SFC_REG_DEV_ADDR_PLUS(0)); 
+    }
+
+    if (op->dummy.nbytes > 0)
+        val |= FIELD_PREP(TRAN_CONF_DMY_BITS_MASK,
+                op->dummy.nbytes * 8 / op->dummy.buswidth);
+
+    if (op->data.nbytes > 0)
+        val |= TRAN_CONF_DATA_EN;
+
+    writel(val, sfc->base + SFC_REG_TRAN_CONF(0));
+    writel(op->data.nbytes, sfc->base + SFC_REG_TRAN_LEN);
+
+    ingenic_sfc_set_transfer_mode(sfc, op);
+
+    writel(0x1f, sfc->base + SFC_REG_SCR);
+    writel(~INTC_MASK_END, sfc->base + SFC_REG_INTC);
+
+    writel(0, sfc->base + SFC_REG_MEM_ADDR);
+
+    writel(TRIG_START, sfc->base + SFC_REG_TRIG);
+
+    ret = wait_for_completion_timeout(&sfc->completion,
+            msecs_to_jiffies(INGENIC_SFC_TRANSFER_TIMEOUT));
+    if (!ret) {
+        writel(0x1f, sfc->base + SFC_REG_INTC);
+        writel(0x1f, sfc->base + SFC_REG_SCR);
+ dev_err(sfc->dev, "line:%d Timeout for ACK from SFC device\n", __LINE__); 
+        return -ETIMEDOUT;
+    }
+
+    writel(SCR_CLR_END, sfc->base + SFC_REG_SCR);
+    writel(TRIG_STOP, sfc->base + SFC_REG_TRIG);
+
+    return 0;
+}
+
+static const struct spi_controller_mem_ops ingenic_sfc_mem_ops = {
+    .adjust_op_size = ingenic_sfc_adjust_op_size,
+    .supports_op = ingenic_sfc_supports_op,
+    .exec_op = ingenic_sfc_exec_op,
+    .poll_status = ingenic_sfc_poll_status,
+};
+
+static int ingenic_sfc_setup(struct spi_device *spi)
+{
+ struct ingenic_sfc *sfc = spi_controller_get_devdata(spi->master); 
+    unsigned long rate;
+    int ret, val;
+
+    if (!spi->max_speed_hz)
+        return -EINVAL;


Maybe set a sane default?



Sure.





+
+    ret = clk_set_rate(sfc->clk, spi->max_speed_hz * 2);
+    if (ret)
+        return -EINVAL;
+
+    writel(TRIG_STOP, sfc->base + SFC_REG_TRIG);
+    writel(0, sfc->base + SFC_REG_DEV_CONF);
+    writel(0, sfc->base + SFC_REG_CGE);
+
+    val = readl(sfc->base + SFC_REG_GLB);
+    u32p_replace_bits(&val, 64 - 1, GLB_THRESHOLD_MASK);
+    writel(val, sfc->base + SFC_REG_GLB);
+
+    val = readl(sfc->base + SFC_REG_DEV_CONF);
+
+    /* cpha bit:0 , cpol bit:0 */
+    val &= ~(DEV_CONF_CPHA | DEV_CONF_CPOL);
+    val |= spi->mode & SPI_CPHA ? DEV_CONF_CPHA : 0;
+    val |= spi->mode & SPI_CPOL ? DEV_CONF_CPOL : 0;
+
+    /* ce_dl bit:1, hold bit:1, wp bit:1 */
+    val |= (DEV_CONF_CE_DL | DEV_CONF_HOLD_DL | DEV_CONF_WP_DL);
+
+    writel(val, sfc->base + SFC_REG_DEV_CONF);
+
+    val = readl(sfc->base + SFC_REG_GLB);
+    u32p_replace_bits(&val, GLB_OP_MODE_SLAVE, GLB_OP_MODE_MASK);
+    writel(val, sfc->base + SFC_REG_GLB);
+
+    rate = clk_get_rate(sfc->clk);
I'd suggest using clk_round_rate() before clk_set_rate() because then you know what frequency it's going to be, and you don't have to call clk_get_rate() afterwards. 



Sure, will try.


Thanks and best regards!



Cheers,
-Paul


+    val = readl(sfc->base + SFC_REG_DEV_CONF);
+    if (sfc->soc_info->version >= ID_X1600 && rate >= 200000000)
+ u32p_replace_bits(&val, DEV_CONF_SMP_DELAY_180DEG, DEV_CONF_SMP_DELAY_MASK); + else if (sfc->soc_info->version == ID_X1000 && rate >= 100000000) + u32p_replace_bits(&val, DEV_CONF_SMP_DELAY_HALF_CYCLE, DEV_CONF_SMP_DELAY_MASK); 
+    writel(val, sfc->base + SFC_REG_DEV_CONF);
+
+    return 0;
+}
+
+static int ingenic_sfc_probe(struct platform_device *pdev)
+{
+    struct ingenic_sfc *sfc;
+    struct spi_controller *ctlr;
+    int ret;
+
+    ctlr = spi_alloc_master(&pdev->dev, sizeof(*sfc));
+    if (!ctlr)
+        return -ENOMEM;
+
+    sfc = spi_controller_get_devdata(ctlr);
+
+    sfc->soc_info = of_device_get_match_data(&pdev->dev);
+    if (!sfc->soc_info) {
+        dev_err(&pdev->dev, "No of match data provided\n");
+        ret = -ENODEV;
+        goto err_put_master;
+    }
+
+    sfc->base = devm_platform_ioremap_resource(pdev, 0);
+    if (IS_ERR(sfc->base)) {
+        ret = PTR_ERR(sfc->base);
+        goto err_put_master;
+    }
+
+    sfc->clk = devm_clk_get(&pdev->dev, "sfc");
+    if (IS_ERR(sfc->clk)) {
+        ret = IS_ERR(sfc->clk);
+        goto err_put_master;
+    }
+
+    ret = clk_prepare_enable(sfc->clk);
+    if (ret)
+        goto err_put_master;
+
+    sfc->irq = platform_get_irq(pdev, 0);
+    if (sfc->irq < 0) {
+        ret = sfc->irq;
+        goto err_put_master;
+    }
+
+    sfc->dev = &pdev->dev;
+
+    platform_set_drvdata(pdev, sfc);
+
+ ret = devm_request_irq(&pdev->dev, sfc->irq, ingenic_sfc_irq_handler, 0, 
+            dev_name(&pdev->dev), sfc);
+    if (ret) {
+ dev_err(&pdev->dev, "Failed to request irq%d, ret = %d\n", sfc->irq, ret); 
+        goto err_put_master;
+    }
+
+    ctlr->bus_num = -1;
+    ctlr->num_chipselect = 1;
+    ctlr->mem_ops = &ingenic_sfc_mem_ops;
+    ctlr->dev.of_node = pdev->dev.of_node;
+    ctlr->setup = ingenic_sfc_setup;
+    ctlr->mode_bits = SPI_CPHA | SPI_CPOL |
+            SPI_RX_DUAL | SPI_RX_QUAD | SPI_TX_DUAL | SPI_TX_QUAD;
+    if (sfc->soc_info->version >= ID_X2000)
+        ctlr->mode_bits |= SPI_RX_OCTAL | SPI_TX_OCTAL;
+
+    ret = devm_spi_register_controller(&pdev->dev, ctlr);
+    if (ret)
+        goto err_put_master;
+
+    return 0;
+
+err_put_master:
+    spi_master_put(ctlr);
+
+    return ret;
+}
+
+static const struct ingenic_soc_info x1000_soc_info = {
+    .version = ID_X1000,
+
+    .max_bus_width = 4,
+
+    .tran_mode_mask = TRAN_CONF_TRAN_MODE_MASK,
+};
+
+static const struct ingenic_soc_info x1600_soc_info = {
+    .version = ID_X1600,
+
+    .max_bus_width = 4,
+
+    .tran_mode_mask = TRAN_CONF_TRAN_MODE_MASK,
+};
+
+static const struct ingenic_soc_info x2000_soc_info = {
+    .version = ID_X2000,
+
+    .max_bus_width = 8,
+
+    .tran_mode_mask = TRAN_CFG1_TRAN_MODE_MASK,
+};
+
+static const struct of_device_id ingenic_sfc_of_matches[] = {
+    { .compatible = "ingenic,x1000-sfc", .data = &x1000_soc_info },
+    { .compatible = "ingenic,x1600-sfc", .data = &x1600_soc_info },
+    { .compatible = "ingenic,x2000-sfc", .data = &x2000_soc_info },
+    { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ingenic_sfc_of_matches);
+
+static struct platform_driver ingenic_sfc_driver = {
+    .driver = {
+        .name = "ingenic-sfc",
+        .of_match_table = ingenic_sfc_of_matches,
+    },
+    .probe = ingenic_sfc_probe,
+};
+module_platform_driver(ingenic_sfc_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("周琰杰 (Zhou Yanjie) <zhouyanjie@xxxxxxxxxxxxxx>"); 
+MODULE_DESCRIPTION("Ingenic SoCs SPI Flash Controller Driver");
--
2.7.4
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