[RFC,v4,3/5] spi: mtk: Add mediatek SPI Nand Flash interface driver

Xiangsheng Hou xiangsheng.hou at mediatek.com
Tue Nov 30 00:32:00 PST 2021


The SPI Nand Flash interface driver cowork with Mediatek pipelined
HW ECC engine.

Signed-off-by: Xiangsheng Hou <xiangsheng.hou at mediatek.com>
---
 drivers/spi/Kconfig        |   11 +
 drivers/spi/Makefile       |    1 +
 drivers/spi/spi-mtk-snfi.c | 1117 ++++++++++++++++++++++++++++++++++++
 3 files changed, 1129 insertions(+)
 create mode 100644 drivers/spi/spi-mtk-snfi.c

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 596705d24400..9cb6a173b1ef 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -535,6 +535,17 @@ config SPI_MT65XX
 	  say Y or M here.If you are not sure, say N.
 	  SPI drivers for Mediatek MT65XX and MT81XX series ARM SoCs.
 
+config SPI_MTK_SNFI
+	tristate "MediaTek SPI NAND interface"
+	depends on MTD
+	select MTD_SPI_NAND
+	select MTD_NAND_ECC_MTK
+	help
+	  This selects the SPI NAND FLASH interface(SNFI),
+	  which could be found on MediaTek Soc.
+	  Say Y or M here.If you are not sure, say N.
+	  Note Parallel Nand and SPI NAND is alternative on MediaTek SoCs.
+
 config SPI_MT7621
 	tristate "MediaTek MT7621 SPI Controller"
 	depends on RALINK || COMPILE_TEST
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index dd7393a6046f..57d11eecf662 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -73,6 +73,7 @@ obj-$(CONFIG_SPI_MPC52xx)		+= spi-mpc52xx.o
 obj-$(CONFIG_SPI_MT65XX)                += spi-mt65xx.o
 obj-$(CONFIG_SPI_MT7621)		+= spi-mt7621.o
 obj-$(CONFIG_SPI_MTK_NOR)		+= spi-mtk-nor.o
+obj-$(CONFIG_SPI_MTK_SNFI)              += spi-mtk-snfi.o
 obj-$(CONFIG_SPI_MXIC)			+= spi-mxic.o
 obj-$(CONFIG_SPI_MXS)			+= spi-mxs.o
 obj-$(CONFIG_SPI_NPCM_FIU)		+= spi-npcm-fiu.o
diff --git a/drivers/spi/spi-mtk-snfi.c b/drivers/spi/spi-mtk-snfi.c
new file mode 100644
index 000000000000..b4dce6d78176
--- /dev/null
+++ b/drivers/spi/spi-mtk-snfi.c
@@ -0,0 +1,1117 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for MediaTek SPI Nand Flash interface
+ *
+ * Copyright (C) 2021 MediaTek Inc.
+ * Authors:	Xiangsheng Hou	<xiangsheng.hou at mediatek.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/nand-ecc-mtk.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi-mem.h>
+
+/* Registers used by the driver */
+#define NFI_CNFG		(0x00)
+#define		CNFG_DMA		BIT(0)
+#define		CNFG_READ_EN		BIT(1)
+#define		CNFG_DMA_BURST_EN	BIT(2)
+#define		CNFG_HW_ECC_EN		BIT(8)
+#define		CNFG_AUTO_FMT_EN	BIT(9)
+#define		CNFG_OP_CUST		GENMASK(14, 13)
+#define NFI_PAGEFMT		(0x04)
+#define		PAGEFMT_512_2K		(0)
+#define		PAGEFMT_2K_4K		(1)
+#define		PAGEFMT_4K_8K		(2)
+#define		PAGEFMT_8K_16K		(3)
+#define		PAGEFMT_PAGE_MASK	GENMASK(1, 0)
+#define		PAGEFMT_SEC_SEL_512	BIT(2)
+#define		PAGEFMT_FDM_SHIFT	(8)
+#define		PAGEFMT_FDM_ECC_SHIFT	(12)
+#define		PAGEFMT_SPARE_SHIFT	(16)
+#define		PAGEFMT_SPARE_MASK	GENMASK(21, 16)
+#define NFI_CON			(0x08)
+#define		CON_FIFO_FLUSH		BIT(0)
+#define		CON_NFI_RST		BIT(1)
+#define		CON_BRD			BIT(8)
+#define		CON_BWR			BIT(9)
+#define		CON_SEC_SHIFT		(12)
+#define		CON_SEC_MASK		GENMASK(16, 12)
+#define NFI_INTR_EN		(0x10)
+#define		INTR_CUS_PROG_EN	BIT(7)
+#define		INTR_CUS_READ_EN	BIT(8)
+#define		INTR_IRQ_EN		BIT(31)
+#define NFI_INTR_STA		(0x14)
+#define NFI_CMD			(0x20)
+#define		CMD_DUMMY		(0x00)
+#define NFI_STRDATA		(0x40)
+#define		STAR_EN			BIT(0)
+#define NFI_STA			(0x60)
+#define		NFI_FSM_MASK		GENMASK(19, 16)
+#define		STA_EMP_PAGE		BIT(12)
+#define NFI_ADDRCNTR		(0x70)
+#define		CNTR_MASK		GENMASK(16, 12)
+#define		ADDRCNTR_SEC_SHIFT	(12)
+#define		ADDRCNTR_SEC(val) \
+		(((val) & CNTR_MASK) >> ADDRCNTR_SEC_SHIFT)
+#define NFI_STRADDR		(0x80)
+#define NFI_BYTELEN		(0x84)
+#define NFI_FDML(x)		(0xA0 + (x) * sizeof(u32) * 2)
+#define NFI_FDMM(x)		(0xA4 + (x) * sizeof(u32) * 2)
+#define NFI_MASTERSTA		(0x224)
+#define		AHB_BUS_BUSY		GENMASK(1, 0)
+#define SNFI_MAC_CTL		(0x500)
+#define		MAC_WIP			BIT(0)
+#define		MAC_WIP_READY		BIT(1)
+#define		MAC_TRIG		BIT(2)
+#define		MAC_EN			BIT(3)
+#define		MAC_SIO_SEL		BIT(4)
+#define SNFI_MAC_OUTL		(0x504)
+#define SNFI_MAC_INL		(0x508)
+#define SNFI_RD_CTL2		(0x510)
+#define		RD_CMD_MASK		GENMASK(7, 0)
+#define		RD_DUMMY_SHIFT		(8)
+#define SNFI_RD_CTL3		(0x514)
+#define		RD_ADDR_MASK		GENMASK(16, 0)
+#define SNFI_PG_CTL1		(0x524)
+#define		WR_LOAD_CMD_MASK	GENMASK(15, 8)
+#define		WR_LOAD_CMD_SHIFT	(8)
+#define SNFI_PG_CTL2		(0x528)
+#define		WR_LOAD_ADDR_MASK	GENMASK(15, 0)
+#define SNFI_MISC_CTL		(0x538)
+#define		RD_CUSTOM_EN		BIT(6)
+#define		WR_CUSTOM_EN		BIT(7)
+#define		LATCH_LAT_SHIFT		(8)
+#define		LATCH_LAT_MASK		GENMASK(9, 8)
+#define		RD_MODE_X2		BIT(16)
+#define		RD_MODE_X4		BIT(17)
+#define		RD_MODE_DQUAL		BIT(18)
+#define		RD_MODE_MASK		GENMASK(18, 16)
+#define		WR_X4_EN		BIT(20)
+#define		SW_RST			BIT(28)
+#define SNFI_MISC_CTL2		(0x53c)
+#define		WR_LEN_SHIFT		(16)
+#define SNFI_DLY_CTL3		(0x548)
+#define		SAM_DLY_MASK		GENMASK(5, 0)
+#define SNFI_STA_CTL1		(0x550)
+#define		SPI_STATE		GENMASK(3, 0)
+#define		CUS_READ_DONE		BIT(27)
+#define		CUS_PROG_DONE		BIT(28)
+#define SNFI_CNFG		(0x55c)
+#define		SNFI_MODE_EN		BIT(0)
+#define SNFI_GPRAM_DATA		(0x800)
+#define		SNFI_GPRAM_MAX_LEN	(160)
+
+#define MTK_SNFI_TIMEOUT		(500000)
+#define MTK_SNFI_RESET_TIMEOUT		(1000000)
+#define MTK_SNFI_AUTOSUSPEND_DELAY	(1000)
+#define KB(x)				((x) * 1024UL)
+
+struct mtk_snfi_caps {
+	u8 pageformat_spare_shift;
+};
+
+struct mtk_snfi {
+	struct device *dev;
+	struct completion done;
+	void __iomem *regs;
+	const struct mtk_snfi_caps *caps;
+
+	struct clk *nfi_clk;
+	struct clk *snfi_clk;
+	struct clk *hclk;
+
+	struct nand_ecc_engine *engine;
+
+	u32 sample_delay;
+	u32 read_latency;
+
+	void *tx_buf;
+	dma_addr_t dma_addr;
+};
+
+static struct mtk_ecc_engine *mtk_snfi_to_ecc_engine(struct mtk_snfi *snfi)
+{
+	return snfi->engine->priv;
+}
+
+static void mtk_snfi_mac_enable(struct mtk_snfi *snfi)
+{
+	u32 val;
+
+	val = readl(snfi->regs + SNFI_MAC_CTL);
+	val &= ~MAC_SIO_SEL;
+	val |= MAC_EN;
+
+	writel(val, snfi->regs + SNFI_MAC_CTL);
+}
+
+static int mtk_snfi_mac_trigger(struct mtk_snfi *snfi)
+{
+	int ret;
+	u32 val;
+
+	val = readl(snfi->regs + SNFI_MAC_CTL);
+	val |= MAC_TRIG;
+	writel(val, snfi->regs + SNFI_MAC_CTL);
+
+	ret = readl_poll_timeout_atomic(snfi->regs + SNFI_MAC_CTL,
+					val, val & MAC_WIP_READY,
+					0, MTK_SNFI_TIMEOUT);
+	if (ret < 0) {
+		dev_err(snfi->dev, "wait for wip ready timeout\n");
+		return -EIO;
+	}
+
+	ret = readl_poll_timeout_atomic(snfi->regs + SNFI_MAC_CTL,
+					val, !(val & MAC_WIP), 0,
+					MTK_SNFI_TIMEOUT);
+	if (ret < 0) {
+		dev_err(snfi->dev, "command write timeout\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static void mtk_snfi_mac_disable(struct mtk_snfi *snfi)
+{
+	u32 val;
+
+	val = readl(snfi->regs + SNFI_MAC_CTL);
+	val &= ~(MAC_TRIG | MAC_EN);
+	writel(val, snfi->regs + SNFI_MAC_CTL);
+}
+
+static int mtk_snfi_mac_op(struct mtk_snfi *snfi)
+{
+	int ret;
+
+	mtk_snfi_mac_enable(snfi);
+	ret = mtk_snfi_mac_trigger(snfi);
+	mtk_snfi_mac_disable(snfi);
+
+	return ret;
+}
+
+static inline void mtk_snfi_read_oob_free(struct mtk_snfi *snfi,
+					  const struct spi_mem_op *op)
+{
+	struct mtk_ecc_engine *eng = mtk_snfi_to_ecc_engine(snfi);
+	u8 *oobptr = op->data.buf.in;
+	u32 vall, valm;
+	int i, j;
+
+	oobptr += eng->section_size * eng->nsteps;
+	for (i = 0; i < eng->nsteps; i++) {
+		vall = readl(snfi->regs + NFI_FDML(i));
+		valm = readl(snfi->regs + NFI_FDMM(i));
+
+		for (j = 0; j < eng->oob_free; j++)
+			oobptr[j] = (j >= 4 ? valm : vall) >> ((j % 4) * 8);
+
+		oobptr += eng->oob_free;
+	}
+}
+
+static inline void mtk_snfi_write_oob_free(struct mtk_snfi *snfi,
+					   const struct spi_mem_op *op)
+{
+	struct mtk_ecc_engine *eng = mtk_snfi_to_ecc_engine(snfi);
+	const u8 *oobptr = op->data.buf.out;
+	u32 vall, valm;
+	int i, j;
+
+	oobptr += eng->section_size * eng->nsteps;
+	for (i = 0; i < eng->nsteps; i++) {
+		vall = 0;
+		valm = 0;
+		for (j = 0; j < 8; j++) {
+			if (j < 4)
+				vall |= (j < eng->oob_free ? oobptr[j] : 0xff)
+					<< (j * 8);
+			else
+				valm |= (j < eng->oob_free ? oobptr[j] : 0xff)
+					<< ((j - 4) * 8);
+		}
+
+		writel(vall, snfi->regs + NFI_FDML(i));
+		writel(valm, snfi->regs + NFI_FDMM(i));
+		oobptr += eng->oob_free;
+	}
+}
+
+static irqreturn_t mtk_snfi_irq(int irq, void *id)
+{
+	struct mtk_snfi *snfi = id;
+	u32 sta, ien;
+
+	sta = readl(snfi->regs + NFI_INTR_STA);
+	ien = readl(snfi->regs + NFI_INTR_EN);
+
+	if (!(sta & ien))
+		return IRQ_NONE;
+
+	writel(0, snfi->regs + NFI_INTR_EN);
+	complete(&snfi->done);
+
+	return IRQ_HANDLED;
+}
+
+static int mtk_snfi_enable_clk(struct device *dev, struct mtk_snfi *snfi)
+{
+	int ret;
+
+	ret = clk_prepare_enable(snfi->nfi_clk);
+	if (ret) {
+		dev_err(dev, "failed to enable nfi clk\n");
+		return ret;
+	}
+
+	ret = clk_prepare_enable(snfi->snfi_clk);
+	if (ret) {
+		dev_err(dev, "failed to enable snfi clk\n");
+		clk_disable_unprepare(snfi->nfi_clk);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(snfi->hclk);
+	if (ret) {
+		dev_err(dev, "failed to enable hclk\n");
+		clk_disable_unprepare(snfi->nfi_clk);
+		clk_disable_unprepare(snfi->snfi_clk);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void mtk_snfi_disable_clk(struct mtk_snfi *snfi)
+{
+	clk_disable_unprepare(snfi->nfi_clk);
+	clk_disable_unprepare(snfi->snfi_clk);
+	clk_disable_unprepare(snfi->hclk);
+}
+
+static int mtk_snfi_reset(struct mtk_snfi *snfi)
+{
+	u32 val;
+	int ret;
+
+	val = readl(snfi->regs + SNFI_MISC_CTL) | SW_RST;
+	writel(val, snfi->regs + SNFI_MISC_CTL);
+
+	ret = readw_poll_timeout(snfi->regs + SNFI_STA_CTL1, val,
+				 !(val & SPI_STATE), 0,
+				 MTK_SNFI_RESET_TIMEOUT);
+	if (ret) {
+		dev_warn(snfi->dev, "wait spi idle timeout 0x%x\n", val);
+		return ret;
+	}
+
+	val = readl(snfi->regs + SNFI_MISC_CTL);
+	val &= ~SW_RST;
+	writel(val, snfi->regs + SNFI_MISC_CTL);
+
+	writew(CON_FIFO_FLUSH | CON_NFI_RST, snfi->regs + NFI_CON);
+	ret = readw_poll_timeout(snfi->regs + NFI_STA, val,
+				 !(val & NFI_FSM_MASK), 0,
+				 MTK_SNFI_RESET_TIMEOUT);
+	if (ret) {
+		dev_warn(snfi->dev, "wait nfi fsm idle timeout 0x%x\n", val);
+		return ret;
+	}
+
+	val = readl(snfi->regs + NFI_STRDATA);
+	val &= ~STAR_EN;
+	writew(val, snfi->regs + NFI_STRDATA);
+
+	return 0;
+}
+
+static int mtk_snfi_init(struct mtk_snfi *snfi)
+{
+	int ret;
+	u32 val;
+
+	ret = mtk_snfi_reset(snfi);
+	if (ret)
+		return ret;
+
+	writel(SNFI_MODE_EN, snfi->regs + SNFI_CNFG);
+
+	if (snfi->sample_delay) {
+		val = readl(snfi->regs + SNFI_DLY_CTL3);
+		val &= ~SAM_DLY_MASK;
+		val |= snfi->sample_delay;
+		writel(val, snfi->regs + SNFI_DLY_CTL3);
+	}
+
+	if (snfi->read_latency) {
+		val = readl(snfi->regs + SNFI_MISC_CTL);
+		val &= ~LATCH_LAT_MASK;
+		val |= (snfi->read_latency << LATCH_LAT_SHIFT);
+		writel(val, snfi->regs + SNFI_MISC_CTL);
+	}
+
+	return 0;
+}
+
+static void mtk_snfi_prepare_for_tx(struct mtk_snfi *snfi,
+				    const struct spi_mem_op *op)
+{
+	struct mtk_ecc_engine *eng = mtk_snfi_to_ecc_engine(snfi);
+	u32 val;
+
+	val = readl(snfi->regs + SNFI_PG_CTL1);
+	val &= ~WR_LOAD_CMD_MASK;
+	val |= op->cmd.opcode << WR_LOAD_CMD_SHIFT;
+	writel(val, snfi->regs + SNFI_PG_CTL1);
+
+	writel(op->addr.val & WR_LOAD_ADDR_MASK,
+	       snfi->regs + SNFI_PG_CTL2);
+
+	val = readl(snfi->regs + SNFI_MISC_CTL);
+	val |= WR_CUSTOM_EN;
+	if (op->data.buswidth == 4)
+		val |= WR_X4_EN;
+	writel(val, snfi->regs + SNFI_MISC_CTL);
+
+	val = eng->nsteps * (eng->oob_per_section + eng->section_size);
+	writel(val << WR_LEN_SHIFT, snfi->regs + SNFI_MISC_CTL2);
+
+	writel(INTR_CUS_PROG_EN | INTR_IRQ_EN, snfi->regs + NFI_INTR_EN);
+}
+
+static void mtk_snfi_prepare_for_rx(struct mtk_snfi *snfi,
+				    const struct spi_mem_op *op)
+{
+	struct mtk_ecc_engine *eng = mtk_snfi_to_ecc_engine(snfi);
+	u32 val, dummy_cycle;
+
+	dummy_cycle = (op->dummy.nbytes << 3) >>
+			(ffs(op->dummy.buswidth) - 1);
+	val = (op->cmd.opcode & RD_CMD_MASK) |
+		  (dummy_cycle << RD_DUMMY_SHIFT);
+	writel(val, snfi->regs + SNFI_RD_CTL2);
+
+	writel(op->addr.val & RD_ADDR_MASK,
+	       snfi->regs + SNFI_RD_CTL3);
+
+	val = readl(snfi->regs + SNFI_MISC_CTL);
+	val |= RD_CUSTOM_EN;
+	val &= ~RD_MODE_MASK;
+	if (op->data.buswidth == 4)
+		val |= RD_MODE_X4;
+	else if (op->data.buswidth == 2)
+		val |= RD_MODE_X2;
+
+	if (op->addr.buswidth != 1)
+		val |= RD_MODE_DQUAL;
+
+	writel(val, snfi->regs + SNFI_MISC_CTL);
+
+	val = eng->nsteps * (eng->oob_per_section + eng->section_size);
+	writel(val, snfi->regs + SNFI_MISC_CTL2);
+
+	writel(INTR_CUS_READ_EN | INTR_IRQ_EN, snfi->regs + NFI_INTR_EN);
+}
+
+static int mtk_snfi_prepare(struct mtk_snfi *snfi,
+			    const struct spi_mem_op *op, bool rx)
+{
+	struct mtk_ecc_engine *eng = mtk_snfi_to_ecc_engine(snfi);
+	dma_addr_t addr;
+	int ret;
+	u32 val;
+
+	addr = dma_map_single(snfi->dev,
+			      op->data.buf.in, op->data.nbytes,
+			      rx ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+	ret = dma_mapping_error(snfi->dev, addr);
+	if (ret) {
+		dev_err(snfi->dev, "dma mapping error\n");
+		return -EINVAL;
+	}
+
+	snfi->dma_addr = addr;
+	writel(lower_32_bits(addr), snfi->regs + NFI_STRADDR);
+
+	if (op->ecc_en && !rx)
+		mtk_snfi_write_oob_free(snfi, op);
+
+	val = readw(snfi->regs + NFI_CNFG);
+	val |= CNFG_DMA | CNFG_DMA_BURST_EN | CNFG_OP_CUST;
+	val |= rx ? CNFG_READ_EN : 0;
+
+	if (op->ecc_en)
+		val |= CNFG_HW_ECC_EN | CNFG_AUTO_FMT_EN;
+
+	writew(val, snfi->regs + NFI_CNFG);
+
+	writel(eng->nsteps << CON_SEC_SHIFT, snfi->regs + NFI_CON);
+
+	init_completion(&snfi->done);
+
+	/* trigger state machine to custom op mode */
+	writel(CMD_DUMMY, snfi->regs + NFI_CMD);
+
+	if (rx)
+		mtk_snfi_prepare_for_rx(snfi, op);
+	else
+		mtk_snfi_prepare_for_tx(snfi, op);
+
+	return 0;
+}
+
+static void mtk_snfi_trigger(struct mtk_snfi *snfi,
+			     const struct spi_mem_op *op, bool rx)
+{
+	u32 val;
+
+	val = readl(snfi->regs + NFI_CON);
+	val |= rx ? CON_BRD : CON_BWR;
+	writew(val, snfi->regs + NFI_CON);
+
+	writew(STAR_EN, snfi->regs + NFI_STRDATA);
+}
+
+static int mtk_snfi_wait_done(struct mtk_snfi *snfi,
+			      const struct spi_mem_op *op, bool rx)
+{
+	struct mtk_ecc_engine *eng = mtk_snfi_to_ecc_engine(snfi);
+	struct device *dev = snfi->dev;
+	u32 val;
+	int ret;
+
+	ret = wait_for_completion_timeout(&snfi->done, msecs_to_jiffies(500));
+	if (!ret) {
+		dev_err(dev, "wait for %d completion done timeout\n", rx);
+		return -ETIMEDOUT;
+	}
+
+	if (rx) {
+		ret = readl_poll_timeout_atomic(snfi->regs + NFI_BYTELEN,
+						val,
+						ADDRCNTR_SEC(val) >=
+						eng->nsteps,
+						0, MTK_SNFI_TIMEOUT);
+		if (ret) {
+			dev_err(dev, "wait for rx section count timeout\n");
+			return -ETIMEDOUT;
+		}
+
+		ret = readl_poll_timeout_atomic(snfi->regs + NFI_MASTERSTA,
+						val,
+						!(val & AHB_BUS_BUSY),
+						0, MTK_SNFI_TIMEOUT);
+		if (ret) {
+			dev_err(dev, "wait for bus busy timeout\n");
+			return -ETIMEDOUT;
+		}
+	} else {
+		ret = readl_poll_timeout_atomic(snfi->regs + NFI_ADDRCNTR,
+						val,
+						ADDRCNTR_SEC(val) >=
+						eng->nsteps,
+						0, MTK_SNFI_TIMEOUT);
+		if (ret) {
+			dev_err(dev, "wait for tx section count timeout\n");
+			return -ETIMEDOUT;
+		}
+	}
+
+	return 0;
+}
+
+static void mtk_snfi_complete(struct mtk_snfi *snfi,
+			      const struct spi_mem_op *op, bool rx)
+{
+	u32 val;
+
+	dma_unmap_single(snfi->dev,
+			 snfi->dma_addr, op->data.nbytes,
+			 rx ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+
+	if (op->ecc_en && rx)
+		mtk_snfi_read_oob_free(snfi, op);
+
+	val = readl(snfi->regs + SNFI_MISC_CTL);
+	val &= rx ? ~RD_CUSTOM_EN : ~WR_CUSTOM_EN;
+	writel(val, snfi->regs + SNFI_MISC_CTL);
+
+	val = readl(snfi->regs + SNFI_STA_CTL1);
+	val |= rx ? CUS_READ_DONE : CUS_PROG_DONE;
+	writew(val, snfi->regs + SNFI_STA_CTL1);
+	val &= rx ? ~CUS_READ_DONE : ~CUS_PROG_DONE;
+	writew(val, snfi->regs + SNFI_STA_CTL1);
+
+	/* Disable interrupt */
+	val = readl(snfi->regs + NFI_INTR_EN);
+	val &= rx ? ~INTR_CUS_READ_EN : ~INTR_CUS_PROG_EN;
+	writew(val, snfi->regs + NFI_INTR_EN);
+
+	writew(0, snfi->regs + NFI_CNFG);
+	writew(0, snfi->regs + NFI_CON);
+}
+
+static int mtk_snfi_transfer_dma(struct mtk_snfi *snfi,
+				 const struct spi_mem_op *op, bool rx)
+{
+	int ret;
+
+	ret = mtk_snfi_prepare(snfi, op, rx);
+	if (ret)
+		return ret;
+
+	mtk_snfi_trigger(snfi, op, rx);
+
+	ret = mtk_snfi_wait_done(snfi, op, rx);
+
+	mtk_snfi_complete(snfi, op, rx);
+
+	return ret;
+}
+
+static int mtk_snfi_transfer_mac(struct mtk_snfi *snfi,
+				 const u8 *txbuf, u8 *rxbuf,
+				 const u32 txlen, const u32 rxlen)
+{
+	u32 i, j, val, tmp;
+	u8 *p_tmp = (u8 *)(&tmp);
+	u32 offset = 0;
+	int ret = 0;
+
+	/* Move tx data to gpram in snfi mac mode */
+	for (i = 0; i < txlen; ) {
+		for (j = 0, tmp = 0; i < txlen && j < 4; i++, j++)
+			p_tmp[j] = txbuf[i];
+
+		writel(tmp, snfi->regs + SNFI_GPRAM_DATA + offset);
+		offset += 4;
+	}
+
+	writel(txlen, snfi->regs + SNFI_MAC_OUTL);
+	writel(rxlen, snfi->regs + SNFI_MAC_INL);
+
+	ret = mtk_snfi_mac_op(snfi);
+	if (ret) {
+		dev_warn(snfi->dev, "snfi mac operation fail\n");
+		return ret;
+	}
+
+	/* Get tx data from gpram in snfi mac mode */
+	if (rxlen)
+		for (i = 0, offset = rounddown(txlen, 4); i < rxlen; ) {
+			val = readl(snfi->regs +
+				    SNFI_GPRAM_DATA + offset);
+			for (j = 0; i < rxlen && j < 4; i++, j++, rxbuf++) {
+				if (i == 0)
+					j = txlen % 4;
+				*rxbuf = (val >> (j * 8)) & 0xff;
+			}
+			offset += 4;
+		}
+
+	return ret;
+}
+
+static int mtk_snfi_exec_op(struct spi_mem *mem,
+			    const struct spi_mem_op *op)
+{
+	struct mtk_snfi *snfi = spi_controller_get_devdata(mem->spi->master);
+	u8 *buf, *txbuf = snfi->tx_buf, *rxbuf = NULL;
+	u32 txlen = 0, rxlen = 0;
+	int i, ret = 0;
+	bool rx;
+
+	rx = op->data.dir == SPI_MEM_DATA_IN;
+
+	ret = mtk_snfi_reset(snfi);
+	if (ret) {
+		dev_warn(snfi->dev, "snfi reset fail\n");
+		return ret;
+	}
+
+	/*
+	 * If tx/rx data buswidth is not 0/1, use snfi DMA mode.
+	 * Otherwise, use snfi mac mode.
+	 */
+	if (op->data.buswidth != 1 && op->data.buswidth != 0) {
+		ret = mtk_snfi_transfer_dma(snfi, op, rx);
+		if (ret)
+			dev_warn(snfi->dev, "snfi dma transfer %d fail %d\n",
+				 rx, ret);
+		return ret;
+	}
+
+	txbuf[txlen++] = op->cmd.opcode;
+
+	if (op->addr.nbytes)
+		for (i = 0; i < op->addr.nbytes; i++)
+			txbuf[txlen++] = op->addr.val >>
+					(8 * (op->addr.nbytes - i - 1));
+
+	txlen += op->dummy.nbytes;
+
+	if (op->data.dir == SPI_MEM_DATA_OUT) {
+		buf = (u8 *)op->data.buf.out;
+		for (i = 0; i < op->data.nbytes; i++)
+			txbuf[txlen++] = buf[i];
+	}
+
+	if (op->data.dir == SPI_MEM_DATA_IN) {
+		rxbuf = (u8 *)op->data.buf.in;
+		rxlen = op->data.nbytes;
+	}
+
+	ret = mtk_snfi_transfer_mac(snfi, txbuf, rxbuf, txlen, rxlen);
+	if (ret)
+		dev_warn(snfi->dev, "snfi mac transfer %d fail %d\n",
+			 op->data.dir, ret);
+
+	return ret;
+}
+
+static int mtk_snfi_check_buswidth(u8 width)
+{
+	switch (width) {
+	case 1:
+	case 2:
+	case 4:
+		return 0;
+
+	default:
+		break;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static bool mtk_snfi_supports_op(struct spi_mem *mem,
+				 const struct spi_mem_op *op)
+{
+	int ret = 0;
+
+	if (!spi_mem_default_supports_op(mem, op))
+		return false;
+
+	if (op->cmd.buswidth != 1)
+		return false;
+
+	/*
+	 * For one operation will use snfi mac mode when data
+	 * buswidth is 0/1. However, the HW ECC engine can not
+	 * be used in mac mode.
+	 */
+	if (op->ecc_en && op->data.buswidth == 1 &&
+	    op->data.nbytes >= SNFI_GPRAM_MAX_LEN)
+		return false;
+
+	switch (op->data.dir) {
+	/* For spi mem data in, can support 1/2/4 buswidth */
+	case SPI_MEM_DATA_IN:
+		if (op->addr.nbytes)
+			ret |= mtk_snfi_check_buswidth(op->addr.buswidth);
+
+		if (op->dummy.nbytes)
+			ret |= mtk_snfi_check_buswidth(op->dummy.buswidth);
+
+		if (op->data.nbytes)
+			ret |= mtk_snfi_check_buswidth(op->data.buswidth);
+
+		if (ret)
+			return false;
+
+		break;
+	case SPI_MEM_DATA_OUT:
+		/*
+		 * For spi mem data out, can support 0/1 buswidth
+		 * for addr/dummy and 1/4 buswidth for data.
+		 */
+		if (op->addr.buswidth != 0 && op->addr.buswidth != 1)
+			return false;
+
+		if (op->dummy.buswidth != 0 && op->dummy.buswidth != 1)
+			return false;
+
+		if (op->data.buswidth != 1 && op->data.buswidth != 4)
+			return false;
+
+		break;
+	default:
+		break;
+	}
+
+	return true;
+}
+
+static int mtk_snfi_adjust_op_size(struct spi_mem *mem,
+				   struct spi_mem_op *op)
+{
+	u32 len, max_len;
+
+	/*
+	 * The op size only support SNFI_GPRAM_MAX_LEN which will
+	 * use the snfi mac mode when data buswidth is 0/1.
+	 * Otherwise, the snfi can max support 16KB.
+	 */
+	if (op->data.buswidth == 1 || op->data.buswidth == 0)
+		max_len = SNFI_GPRAM_MAX_LEN;
+	else
+		max_len = KB(16);
+
+	len = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes;
+	if (len > max_len)
+		return -EOPNOTSUPP;
+
+	if ((len + op->data.nbytes) > max_len)
+		op->data.nbytes = max_len - len;
+
+	return 0;
+}
+
+static const struct mtk_snfi_caps mtk_snfi_caps_mt7622 = {
+	.pageformat_spare_shift = 16,
+};
+
+static const struct spi_controller_mem_ops mtk_snfi_ops = {
+	.adjust_op_size = mtk_snfi_adjust_op_size,
+	.supports_op = mtk_snfi_supports_op,
+	.exec_op = mtk_snfi_exec_op,
+};
+
+static const struct of_device_id mtk_snfi_id_table[] = {
+	{ .compatible = "mediatek,mt7622-snfi",
+	  .data = &mtk_snfi_caps_mt7622,
+	},
+	{  /* sentinel */ }
+};
+
+/* ECC wrapper */
+static struct mtk_snfi *mtk_nand_to_spi(struct nand_device *nand)
+{
+	struct device *dev = nand->ecc.engine->dev;
+	struct spi_master *master = dev_get_drvdata(dev);
+	struct mtk_snfi *snfi = spi_master_get_devdata(master);
+
+	return snfi;
+}
+
+static int mtk_snfi_config(struct nand_device *nand,
+			   struct mtk_snfi *snfi)
+{
+	struct mtk_ecc_engine *eng = mtk_snfi_to_ecc_engine(snfi);
+	u32 val;
+
+	switch (nanddev_page_size(nand)) {
+	case 512:
+		val = PAGEFMT_512_2K | PAGEFMT_SEC_SEL_512;
+		break;
+	case KB(2):
+		if (eng->section_size == 512)
+			val = PAGEFMT_2K_4K | PAGEFMT_SEC_SEL_512;
+		else
+			val = PAGEFMT_512_2K;
+		break;
+	case KB(4):
+		if (eng->section_size == 512)
+			val = PAGEFMT_4K_8K | PAGEFMT_SEC_SEL_512;
+		else
+			val = PAGEFMT_2K_4K;
+		break;
+	case KB(8):
+		if (eng->section_size == 512)
+			val = PAGEFMT_8K_16K | PAGEFMT_SEC_SEL_512;
+		else
+			val = PAGEFMT_4K_8K;
+		break;
+	case KB(16):
+		val = PAGEFMT_8K_16K;
+		break;
+	default:
+		dev_err(snfi->dev, "invalid page len: %d\n",
+			nanddev_page_size(nand));
+		return -EINVAL;
+	}
+
+	val |= eng->oob_per_section_idx << PAGEFMT_SPARE_SHIFT;
+	val |= eng->oob_free << PAGEFMT_FDM_SHIFT;
+	val |= eng->oob_free_protected << PAGEFMT_FDM_ECC_SHIFT;
+	writel(val, snfi->regs + NFI_PAGEFMT);
+
+	return 0;
+}
+
+static int mtk_snfi_ecc_init_ctx(struct nand_device *nand)
+{
+	struct nand_ecc_engine_ops *ops = mtk_ecc_get_pipelined_ops();
+
+	return ops->init_ctx(nand);
+}
+
+static void mtk_snfi_ecc_cleanup_ctx(struct nand_device *nand)
+{
+	struct nand_ecc_engine_ops *ops = mtk_ecc_get_pipelined_ops();
+
+	ops->cleanup_ctx(nand);
+}
+
+static int mtk_snfi_ecc_prepare_io_req(struct nand_device *nand,
+				       struct nand_page_io_req *req)
+{
+	struct nand_ecc_engine_ops *ops = mtk_ecc_get_pipelined_ops();
+	struct mtk_snfi *snfi = mtk_nand_to_spi(nand);
+	int ret;
+
+	ret = mtk_snfi_config(nand, snfi);
+	if (ret)
+		return ret;
+
+	return ops->prepare_io_req(nand, req);
+}
+
+static int mtk_snfi_ecc_finish_io_req(struct nand_device *nand,
+				      struct nand_page_io_req *req)
+{
+	struct nand_ecc_engine_ops *ops = mtk_ecc_get_pipelined_ops();
+	struct mtk_ecc_engine *eng = nand_to_ecc_ctx(nand);
+	struct mtk_snfi *snfi = mtk_nand_to_spi(nand);
+
+	if (req->mode != MTD_OPS_RAW)
+		eng->read_empty = readl(snfi->regs + NFI_STA) & STA_EMP_PAGE;
+
+	return ops->finish_io_req(nand, req);
+}
+
+static struct nand_ecc_engine_ops mtk_snfi_ecc_engine_pipelined_ops = {
+	.init_ctx = mtk_snfi_ecc_init_ctx,
+	.cleanup_ctx = mtk_snfi_ecc_cleanup_ctx,
+	.prepare_io_req = mtk_snfi_ecc_prepare_io_req,
+	.finish_io_req = mtk_snfi_ecc_finish_io_req,
+};
+
+static int mtk_snfi_ecc_probe(struct platform_device *pdev,
+			      struct mtk_snfi *snfi)
+{
+	struct nand_ecc_engine *ecceng;
+
+	if (!mtk_ecc_get_pipelined_ops())
+		return -EOPNOTSUPP;
+
+	ecceng = devm_kzalloc(&pdev->dev, sizeof(*ecceng), GFP_KERNEL);
+	if (!ecceng)
+		return -ENOMEM;
+
+	ecceng->dev = &pdev->dev;
+	ecceng->ops = &mtk_snfi_ecc_engine_pipelined_ops;
+
+	nand_ecc_register_on_host_hw_engine(ecceng);
+
+	snfi->engine = ecceng;
+
+	return 0;
+}
+
+static int mtk_snfi_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct spi_controller *ctlr;
+	struct mtk_snfi *snfi;
+	struct resource *res;
+	int ret, irq;
+	u32 val = 0;
+
+	ctlr = spi_alloc_master(&pdev->dev, sizeof(*snfi));
+	if (!ctlr)
+		return -ENOMEM;
+
+	snfi = spi_controller_get_devdata(ctlr);
+	snfi->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	snfi->regs = devm_ioremap_resource(snfi->dev, res);
+	if (IS_ERR(snfi->regs)) {
+		ret = PTR_ERR(snfi->regs);
+		goto err_put_master;
+	}
+
+	ret = of_property_read_u32(np, "sample-delay", &val);
+	if (!ret)
+		snfi->sample_delay = val;
+
+	ret = of_property_read_u32(np, "read-latency", &val);
+	if (!ret)
+		snfi->read_latency = val;
+
+	snfi->nfi_clk = devm_clk_get(snfi->dev, "nfi_clk");
+	if (IS_ERR(snfi->nfi_clk)) {
+		dev_err(snfi->dev, "not found nfi clk\n");
+		ret = PTR_ERR(snfi->nfi_clk);
+		goto err_put_master;
+	}
+
+	snfi->snfi_clk = devm_clk_get(snfi->dev, "snfi_clk");
+	if (IS_ERR(snfi->snfi_clk)) {
+		dev_err(snfi->dev, "not found snfi clk\n");
+		ret = PTR_ERR(snfi->snfi_clk);
+		goto err_put_master;
+	}
+
+	snfi->hclk = devm_clk_get(snfi->dev, "hclk");
+	if (IS_ERR(snfi->hclk)) {
+		dev_err(snfi->dev, "not found hclk\n");
+		ret = PTR_ERR(snfi->hclk);
+		goto err_put_master;
+	}
+
+	ret = mtk_snfi_enable_clk(snfi->dev, snfi);
+	if (ret)
+		goto err_put_master;
+
+	snfi->caps = of_device_get_match_data(snfi->dev);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(snfi->dev, "not found snfi irq resource\n");
+		ret = -EINVAL;
+		goto clk_disable;
+	}
+
+	ret = devm_request_irq(snfi->dev, irq, mtk_snfi_irq,
+			       0, "mtk-snfi", snfi);
+	if (ret) {
+		dev_err(snfi->dev, "failed to request snfi irq\n");
+		goto clk_disable;
+	}
+
+	ret = dma_set_mask(snfi->dev, DMA_BIT_MASK(32));
+	if (ret) {
+		dev_err(snfi->dev, "failed to set dma mask\n");
+		goto clk_disable;
+	}
+
+	snfi->tx_buf = kzalloc(SNFI_GPRAM_MAX_LEN, GFP_KERNEL);
+	if (!snfi->tx_buf) {
+		ret = -ENOMEM;
+		goto clk_disable;
+	}
+
+	ctlr->dev.of_node = np;
+	ctlr->mem_ops = &mtk_snfi_ops;
+	ctlr->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD | SPI_TX_QUAD;
+	ctlr->auto_runtime_pm = true;
+
+	dev_set_drvdata(snfi->dev, ctlr);
+
+	ret = mtk_snfi_init(snfi);
+	if (ret) {
+		dev_err(snfi->dev, "failed to init snfi\n");
+		goto free_buf;
+	}
+
+	ret = mtk_snfi_ecc_probe(pdev, snfi);
+	if (ret) {
+		dev_warn(snfi->dev, "ECC engine not available\n");
+		goto free_buf;
+	}
+
+	pm_runtime_enable(snfi->dev);
+
+	ret = devm_spi_register_master(snfi->dev, ctlr);
+	if (ret) {
+		dev_err(snfi->dev, "failed to register spi master\n");
+		goto disable_pm_runtime;
+	}
+
+	return 0;
+
+disable_pm_runtime:
+	pm_runtime_disable(snfi->dev);
+
+free_buf:
+	kfree(snfi->tx_buf);
+
+clk_disable:
+	mtk_snfi_disable_clk(snfi);
+
+err_put_master:
+	spi_master_put(ctlr);
+
+	return ret;
+}
+
+static int mtk_snfi_remove(struct platform_device *pdev)
+{
+	struct spi_controller *ctlr = dev_get_drvdata(&pdev->dev);
+	struct mtk_snfi *snfi = spi_controller_get_devdata(ctlr);
+	struct nand_ecc_engine *eng = snfi->engine;
+
+	pm_runtime_disable(snfi->dev);
+	nand_ecc_unregister_on_host_hw_engine(eng);
+	kfree(snfi->tx_buf);
+	spi_master_put(ctlr);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int mtk_snfi_runtime_suspend(struct device *dev)
+{
+	struct spi_controller *ctlr = dev_get_drvdata(dev);
+	struct mtk_snfi *snfi = spi_controller_get_devdata(ctlr);
+
+	mtk_snfi_disable_clk(snfi);
+
+	return 0;
+}
+
+static int mtk_snfi_runtime_resume(struct device *dev)
+{
+	struct spi_controller *ctlr = dev_get_drvdata(dev);
+	struct mtk_snfi *snfi = spi_controller_get_devdata(ctlr);
+	int ret;
+
+	ret = mtk_snfi_enable_clk(dev, snfi);
+	if (ret)
+		return ret;
+
+	ret = mtk_snfi_init(snfi);
+	if (ret)
+		dev_err(dev, "failed to init snfi\n");
+
+	return ret;
+}
+#endif /* CONFIG_PM */
+
+static const struct dev_pm_ops mtk_snfi_pm_ops = {
+	SET_RUNTIME_PM_OPS(mtk_snfi_runtime_suspend,
+			   mtk_snfi_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
+};
+
+static struct platform_driver mtk_snfi_driver = {
+	.driver = {
+		.name	= "mtk-snfi",
+		.of_match_table = mtk_snfi_id_table,
+		.pm = &mtk_snfi_pm_ops,
+	},
+	.probe		= mtk_snfi_probe,
+	.remove		= mtk_snfi_remove,
+};
+
+module_platform_driver(mtk_snfi_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Xiangsheng Hou <xiangsheng.hou at mediatek.com>");
+MODULE_DESCRIPTION("Mediatek SPI Nand Flash interface driver");
-- 
2.25.1




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