[PATCH] mtd: spi-nor: add hisilicon spi-nor flash controller driver

Jiancheng Xue
2015-12-30T02:26:11Z

add hisilicon spi-nor flash controller driver

Signed-off-by: Binquan Peng <pengbinquan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Signed-off-by: Jiancheng Xue <xuejiancheng-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
---
.../devicetree/bindings/spi/spi-hisi-sfc.txt | 24 +
drivers/mtd/spi-nor/Kconfig | 7 +
drivers/mtd/spi-nor/Makefile | 1 +
drivers/mtd/spi-nor/hisi-sfc.c | 505 +++++++++++++++++++++
4 files changed, 537 insertions(+)
create mode 100644 Documentation/devicetree/bindings/spi/spi-hisi-sfc.txt
create mode 100644 drivers/mtd/spi-nor/hisi-sfc.c

diff --git a/Documentation/devicetree/bindings/spi/spi-hisi-sfc.txt b/Documentation/devicetree/bindings/spi/spi-hisi-sfc.txt
new file mode 100644
index 0000000..170885a
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-hisi-sfc.txt
@@ -0,0 +1,24 @@
+HiSilicon SPI-NOR Flash Controller
+
+Required properties:
+- compatible : Should be "hisilicon,hisi-sfc".
+- address-cells: number of cells required to define a chip select
+ address on the SPI bus. Should be set to 1. See spi-bus.txt.
+- size-cells:Should be 0.
+- reg : Offset and length of the register set for the controller device.
+- reg-names: Must include the following two entries:"control","memory".
+- clocks: handle to spi-nor flash controller clock.
+
+Example:
+spi-nor-controller@14000000 {
+ compatible = "hisilicon,hisi-sfc";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0x10000000 0x1000>, <0x14000000 0x1000000>;
+ reg-names = "control", "memory";
+ clocks = <&clock HI3519_FMC_CLK>;
+ spi-nor@0 {
+ compatible = "jedec,spi-nor";
+ reg = <0>;
+ };
+};
diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig
index 2fe2a7e..7fe1564 100644
--- a/drivers/mtd/spi-nor/Kconfig
+++ b/drivers/mtd/spi-nor/Kconfig
@@ -30,6 +30,12 @@ config SPI_FSL_QUADSPI
This controller does not support generic SPI. It only supports
SPI NOR.

+config SPI_HISI_SFC
+ tristate "Hisilicon SPI-NOR Flash Controller(SFC)"
+ depends on ARCH_HISI
+ help
+ This enables support for hisilicon SPI-NOR flash controller.
+
config SPI_NXP_SPIFI
tristate "NXP SPI Flash Interface (SPIFI)"
depends on OF && (ARCH_LPC18XX || COMPILE_TEST)
@@ -41,4 +47,5 @@ config SPI_NXP_SPIFI
Flash. Enable this option if you have a device with a SPIFI
controller and want to access the Flash as a mtd device.

+
endif # MTD_SPI_NOR
diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile
index e53333e..8cea3c5 100644
--- a/drivers/mtd/spi-nor/Makefile
+++ b/drivers/mtd/spi-nor/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_MTD_SPI_NOR) += spi-nor.o
obj-$(CONFIG_SPI_FSL_QUADSPI) += fsl-quadspi.o
+obj-$(CONFIG_SPI_HISI_SFC) += hisi-sfc.o
obj-$(CONFIG_SPI_NXP_SPIFI) += nxp-spifi.o
diff --git a/drivers/mtd/spi-nor/hisi-sfc.c b/drivers/mtd/spi-nor/hisi-sfc.c
new file mode 100644
index 0000000..fd9649a
--- /dev/null
+++ b/drivers/mtd/spi-nor/hisi-sfc.c
@@ -0,0 +1,505 @@
+/* HiSilicon SPI Nor Flash Controller Driver
+ *
+ * Copyright (c) 2015 HiSilicon Technologies Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/mtd/mtd.h>
+#include <linux/of_platform.h>
+#include <linux/mtd/spi-nor.h>
+
+/* Hardware register offsets and field definitions */
+#define FMC_CFG 0x00
+#define SPI_NOR_ADDR_MODE BIT(10)
+#define FMC_GLOBAL_CFG 0x04
+#define FMC_GLOBAL_CFG_WP_ENABLE BIT(6)
+#define FMC_SPI_TIMING_CFG 0x08
+#define TIMING_CFG_TCSH(nr) (((nr) & 0xf) << 8)
+#define TIMING_CFG_TCSS(nr) (((nr) & 0xf) << 4)
+#define TIMING_CFG_TSHSL(nr) ((nr) & 0xf)
+#define CS_HOLD_TIME 0x6
+#define CS_SETUP_TIME 0x6
+#define CS_DESELECT_TIME 0xf
+#define FMC_INT 0x18
+#define FMC_INT_OP_DONE BIT(0)
+#define FMC_INT_CLR 0x20
+#define FMC_CMD 0x24
+#define FMC_CMD_CMD1(_cmd) ((_cmd) & 0xff)
+#define FMC_ADDRL 0x2c
+#define FMC_OP_CFG 0x30
+#define OP_CFG_FM_CS(_cs) ((_cs) << 11)
+#define OP_CFG_MEM_IF_TYPE(_type) (((_type) & 0x7) << 7)
+#define OP_CFG_ADDR_NUM(_addr) (((_addr) & 0x7) << 4)
+#define OP_CFG_DUMMY_NUM(_dummy) ((_dummy) & 0xf)
+#define FMC_DATA_NUM 0x38
+#define FMC_DATA_NUM_CNT(_n) ((_n) & 0x3fff)
+#define FMC_OP 0x3c
+#define FMC_OP_DUMMY_EN BIT(8)
+#define FMC_OP_CMD1_EN BIT(7)
+#define FMC_OP_ADDR_EN BIT(6)
+#define FMC_OP_WRITE_DATA_EN BIT(5)
+#define FMC_OP_READ_DATA_EN BIT(2)
+#define FMC_OP_READ_STATUS_EN BIT(1)
+#define FMC_OP_REG_OP_START BIT(0)
+#define FMC_DMA_LEN 0x40
+#define FMC_DMA_LEN_SET(_len) ((_len) & 0x0fffffff)
+#define FMC_DMA_SADDR_D0 0x4c
+#define HIFMC_DMA_MAX_LEN (4096)
+#define HIFMC_DMA_MASK (HIFMC_DMA_MAX_LEN - 1)
+#define FMC_OP_DMA 0x68
+#define OP_CTRL_RD_OPCODE(_code) (((_code) & 0xff) << 16)
+#define OP_CTRL_WR_OPCODE(_code) (((_code) & 0xff) << 8)
+#define OP_CTRL_RW_OP(_op) ((_op) << 1)
+#define OP_CTRL_DMA_OP_READY BIT(0)
+#define FMC_OP_READ 0x0
+#define FMC_OP_WRITE 0x1
+#define FMC_WAIT_TIMEOUT 10000000
+
+enum hifmc_iftype {
+ IF_TYPE_STD,
+ IF_TYPE_DUAL,
+ IF_TYPE_DIO,
+ IF_TYPE_QUAD,
+ IF_TYPE_QIO,
+};
+
+struct hifmc_priv {
+ int chipselect;
+ u32 clkrate;
+ struct hifmc_host *host;
+};
+
+#define HIFMC_MAX_CHIP_NUM 2
+struct hifmc_host {
+ struct device *dev;
+ struct mutex lock;
+
+ void __iomem *regbase;
+ void __iomem *iobase;
+ struct clk *clk;
+ void *buffer;
+ dma_addr_t dma_buffer;
+
+ struct spi_nor nor[HIFMC_MAX_CHIP_NUM];
+ struct hifmc_priv priv[HIFMC_MAX_CHIP_NUM];
+ int num_chip;
+};
+
+static inline int wait_op_finish(struct hifmc_host *host)
+{
+ unsigned int reg, timeout = FMC_WAIT_TIMEOUT;
+
+ do {
+ reg = readl(host->regbase + FMC_INT);
+ } while (!(reg & FMC_INT_OP_DONE) && --timeout);
+
+ if (!timeout) {
+ dev_dbg(host->dev, "wait for operation finish timeout\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+static int get_if_type(enum read_mode flash_read)
+{
+ enum hifmc_iftype if_type;
+
+ switch (flash_read) {
+ case SPI_NOR_DUAL:
+ if_type = IF_TYPE_DUAL;
+ break;
+ case SPI_NOR_QUAD:
+ if_type = IF_TYPE_QUAD;
+ break;
+ case SPI_NOR_NORMAL:
+ case SPI_NOR_FAST:
+ default:
+ if_type = IF_TYPE_STD;
+ break;
+ }
+
+ return if_type;
+}
+
+void hisi_spi_nor_init(struct hifmc_host *host)
+{
+ unsigned int reg;
+
+ reg = TIMING_CFG_TCSH(CS_HOLD_TIME)
+ | TIMING_CFG_TCSS(CS_SETUP_TIME)
+ | TIMING_CFG_TSHSL(CS_DESELECT_TIME);
+ writel(reg, host->regbase + FMC_SPI_TIMING_CFG);
+}
+
+static int hisi_spi_nor_prep(struct spi_nor *nor, enum spi_nor_ops ops)
+{
+ struct hifmc_priv *priv = nor->priv;
+ struct hifmc_host *host = priv->host;
+ int ret;
+
+ mutex_lock(&host->lock);
+
+ ret = clk_set_rate(host->clk, priv->clkrate);
+ if (ret)
+ goto out;
+
+ ret = clk_prepare_enable(host->clk);
+ if (ret)
+ goto out;
+
+ return 0;
+
+out:
+ mutex_unlock(&host->lock);
+ return ret;
+}
+
+static void hisi_spi_nor_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
+{
+ struct hifmc_priv *priv = nor->priv;
+ struct hifmc_host *host = priv->host;
+
+ clk_disable_unprepare(host->clk);
+ mutex_unlock(&host->lock);
+}
+
+static void hisi_spi_nor_cmd_prepare(struct hifmc_host *host, u8 cmd, u8 *buf,
+ u32 *opcfg)
+{
+ u32 reg;
+
+ *opcfg = 0;
+ *opcfg |= FMC_OP_CMD1_EN;
+ switch (cmd) {
+ case SPINOR_OP_RDID:
+ case SPINOR_OP_RDSR:
+ case SPINOR_OP_RDCR:
+ *opcfg |= FMC_OP_READ_DATA_EN;
+ break;
+ case SPINOR_OP_WREN:
+ reg = readl(host->regbase + FMC_GLOBAL_CFG);
+ if (reg & FMC_GLOBAL_CFG_WP_ENABLE) {
+ reg &= ~FMC_GLOBAL_CFG_WP_ENABLE;
+ writel(reg, host->regbase + FMC_GLOBAL_CFG);
+ }
+ break;
+ case SPINOR_OP_WRSR:
+ *opcfg |= FMC_OP_WRITE_DATA_EN;
+ break;
+ case SPINOR_OP_BE_4K:
+ case SPINOR_OP_BE_4K_PMC:
+ case SPINOR_OP_SE_4B:
+ case SPINOR_OP_SE:
+ *opcfg |= FMC_OP_ADDR_EN;
+ break;
+ case SPINOR_OP_EN4B:
+ reg = readl(host->regbase + FMC_CFG);
+ reg |= SPI_NOR_ADDR_MODE;
+ writel(reg, host->regbase + FMC_CFG);
+ break;
+ case SPINOR_OP_EX4B:
+ reg = readl(host->regbase + FMC_CFG);
+ reg &= ~SPI_NOR_ADDR_MODE;
+ writel(reg, host->regbase + FMC_CFG);
+ break;
+ case SPINOR_OP_CHIP_ERASE:
+ default:
+ break;
+ }
+}
+
+static int hisi_spi_nor_send_cmd(struct spi_nor *nor, u8 cmd, u8 *buf, int len)
+{
+ struct hifmc_priv *priv = nor->priv;
+ struct hifmc_host *host = priv->host;
+ u32 reg, op_cfg = 0;
+
+ hisi_spi_nor_cmd_prepare(host, cmd, buf, &op_cfg);
+
+ reg = FMC_CMD_CMD1(cmd);
+ writel(reg, host->regbase + FMC_CMD);
+
+ if (op_cfg & FMC_OP_ADDR_EN) {
+ reg = (u32)buf;
+ writel(reg, host->regbase + FMC_ADDRL);
+ }
+
+ reg = OP_CFG_FM_CS(priv->chipselect);
+ if (op_cfg & FMC_OP_ADDR_EN)
+ reg |= OP_CFG_ADDR_NUM(nor->addr_width);
+ writel(reg, host->regbase + FMC_OP_CFG);
+
+ reg = FMC_DATA_NUM_CNT(len);
+ writel(reg, host->regbase + FMC_DATA_NUM);
+
+ writel(0xff, host->regbase + FMC_INT_CLR);
+ reg = op_cfg | FMC_OP_REG_OP_START;
+ writel(reg, host->regbase + FMC_OP);
+ wait_op_finish(host);
+
+ return 0;
+}
+
+static int hisi_spi_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
+ int len)
+{
+ struct hifmc_priv *priv = nor->priv;
+ struct hifmc_host *host = priv->host;
+ int ret;
+
+ ret = hisi_spi_nor_send_cmd(nor, opcode, buf, len);
+ if (ret)
+ return ret;
+
+ memcpy(buf, host->iobase, len);
+
+ return ret;
+}
+
+static int hisi_spi_nor_write_reg(struct spi_nor *nor, u8 opcode,
+ u8 *buf, int len)
+{
+ struct hifmc_priv *priv = nor->priv;
+ struct hifmc_host *host = priv->host;
+
+ if (len)
+ memcpy(host->iobase, buf, len);
+
+ return hisi_spi_nor_send_cmd(nor, opcode, buf, len);
+}
+
+static void hisi_spi_nor_dma_transfer(struct spi_nor *nor, u32 start_off,
+ u32 dma_buf, u32 len, u8 op_type)
+{
+ struct hifmc_priv *priv = nor->priv;
+ struct hifmc_host *host = priv->host;
+ u8 if_type = 0, dummy = 0;
+ u8 w_cmd = 0, r_cmd = 0;
+ u32 reg;
+
+ writel(start_off, host->regbase + FMC_ADDRL);
+
+ if (op_type == FMC_OP_READ) {
+ if_type = get_if_type(nor->flash_read);
+ dummy = nor->read_dummy >> 3;
+ r_cmd = nor->read_opcode;
+ } else
+ w_cmd = nor->program_opcode;
+
+ reg = OP_CFG_FM_CS(priv->chipselect)
+ | OP_CFG_MEM_IF_TYPE(if_type)
+ | OP_CFG_ADDR_NUM(nor->addr_width)
+ | OP_CFG_DUMMY_NUM(dummy);
+ writel(reg, host->regbase + FMC_OP_CFG);
+
+ reg = FMC_DMA_LEN_SET(len);
+ writel(reg, host->regbase + FMC_DMA_LEN);
+ writel(dma_buf, host->regbase + FMC_DMA_SADDR_D0);
+
+ reg = OP_CTRL_RD_OPCODE(r_cmd)
+ | OP_CTRL_WR_OPCODE(w_cmd)
+ | OP_CTRL_RW_OP(op_type)
+ | OP_CTRL_DMA_OP_READY;
+ writel(0xff, host->regbase + FMC_INT_CLR);
+ writel(reg, host->regbase + FMC_OP_DMA);
+ wait_op_finish(host);
+}
+
+static int hisi_spi_nor_read(struct spi_nor *nor, loff_t from, size_t len,
+ size_t *retlen, u_char *read_buf)
+{
+ struct hifmc_priv *priv = nor->priv;
+ struct hifmc_host *host = priv->host;
+ unsigned char *ptr = read_buf;
+ int num;
+
+ while (len > 0) {
+ num = (len >= HIFMC_DMA_MAX_LEN)
+ ? HIFMC_DMA_MAX_LEN : len;
+ hisi_spi_nor_dma_transfer(nor, from, host->dma_buffer,
+ num, FMC_OP_READ);
+ memcpy(ptr, host->buffer, num);
+ ptr += num;
+ from += num;
+ len -= num;
+ }
+ *retlen += (size_t)(ptr - read_buf);
+
+ return 0;
+}
+
+static void hisi_spi_nor_write(struct spi_nor *nor, loff_t to,
+ size_t len, size_t *retlen, const u_char *write_buf)
+{
+ struct hifmc_priv *priv = nor->priv;
+ struct hifmc_host *host = priv->host;
+ const unsigned char *ptr = write_buf;
+ int num;
+
+ while (len > 0) {
+ if (to & HIFMC_DMA_MASK)
+ num = (HIFMC_DMA_MAX_LEN - (to & HIFMC_DMA_MASK))
+ >= len ? len
+ : (HIFMC_DMA_MAX_LEN - (to & HIFMC_DMA_MASK));
+ else
+ num = (len >= HIFMC_DMA_MAX_LEN)
+ ? HIFMC_DMA_MAX_LEN : len;
+ memcpy(host->buffer, ptr, num);
+ hisi_spi_nor_dma_transfer(nor, to, host->dma_buffer, num,
+ FMC_OP_WRITE);
+ to += num;
+ ptr += num;
+ len -= num;
+ }
+ *retlen += (size_t)(ptr - write_buf);
+}
+
+static int hisi_spi_nor_erase(struct spi_nor *nor, loff_t offs)
+{
+ return hisi_spi_nor_send_cmd(nor, nor->erase_opcode,
+ (u8 *)(u32)offs, 0);
+}
+
+static int hisi_spi_nor_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct hifmc_host *host;
+ struct device_node *np;
+ int ret, i = 0;
+
+ host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
+ if (!host)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, host);
+ host->dev = dev;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "control");
+ host->regbase = devm_ioremap_resource(dev, res);
+ if (IS_ERR(host->regbase))
+ return PTR_ERR(host->regbase);
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "memory");
+ host->iobase = devm_ioremap_resource(dev, res);
+ if (IS_ERR(host->iobase))
+ return PTR_ERR(host->iobase);
+
+ host->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(host->clk))
+ return PTR_ERR(host->clk);
+
+ host->buffer = dmam_alloc_coherent(dev, HIFMC_DMA_MAX_LEN,
+ &host->dma_buffer, GFP_KERNEL);
+ if (!host->buffer)
+ return -ENOMEM;
+
+ mutex_init(&host->lock);
+ clk_prepare_enable(host->clk);
+ hisi_spi_nor_init(host);
+
+ for_each_available_child_of_node(dev->of_node, np) {
+ struct spi_nor *nor;
+ struct hifmc_priv *priv;
+ struct mtd_info *mtd;
+ struct mtd_partition *parts = NULL;
+ int nr_parts = 0;
+
+ nor = &host->nor[i];
+ mtd = &nor->mtd;
+ priv = &host->priv[i];
+
+ mtd->name = np->name;
+ nor->dev = dev;
+ nor->flash_node = np;
+ ret = of_property_read_u32(np, "reg", &priv->chipselect);
+ if (ret)
+ goto fail;
+ ret = of_property_read_u32(np, "spi-max-frequency",
+ &priv->clkrate);
+ if (ret)
+ goto fail;
+ priv->host = host;
+ nor->priv = priv;
+
+ nor->prepare = hisi_spi_nor_prep;
+ nor->unprepare = hisi_spi_nor_unprep;
+ nor->read_reg = hisi_spi_nor_read_reg;
+ nor->write_reg = hisi_spi_nor_write_reg;
+ nor->read = hisi_spi_nor_read;
+ nor->write = hisi_spi_nor_write;
+ nor->erase = hisi_spi_nor_erase;
+ ret = spi_nor_scan(nor, NULL, SPI_NOR_QUAD);
+ if (ret)
+ goto fail;
+
+ ret = mtd_device_register(mtd, parts, nr_parts);
+ if (ret)
+ goto fail;
+
+ i++;
+ host->num_chip++;
+ if (i == HIFMC_MAX_CHIP_NUM)
+ break;
+ }
+
+ return 0;
+
+fail:
+ for (i = 0; i < host->num_chip; i++)
+ mtd_device_unregister(&host->nor[i].mtd);
+
+ clk_disable_unprepare(host->clk);
+ mutex_destroy(&host->lock);
+
+ return ret;
+}
+
+static int hisi_spi_nor_remove(struct platform_device *pdev)
+{
+ struct hifmc_host *host = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < host->num_chip; i++)
+ mtd_device_unregister(&host->nor[i].mtd);
+
+ clk_disable_unprepare(host->clk);
+ mutex_destroy(&host->lock);
+
+ return 0;
+}
+
+static const struct of_device_id hisi_spi_nor_dt_ids[] = {
+ { .compatible = "hisilicon,hisi-sfc"},
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, hisi_spi_nor_dt_ids);
+
+static struct platform_driver hisi_spi_nor_driver = {
+ .driver = {
+ .name = "hisi-sfc",
+ .of_match_table = hisi_spi_nor_dt_ids,
+ },
+ .probe = hisi_spi_nor_probe,
+ .remove = hisi_spi_nor_remove,
+};
+module_platform_driver(hisi_spi_nor_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("HiSilicon SPI Nor Flash Controller Driver");
--
1.9.1

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