[PATCH v9 1/2] spi: ca_sflash: Add CAxxxx SPI Flash Controller

* [PATCH v9 1/2] spi: ca_sflash: Add CAxxxx SPI Flash Controller
@ 2020-06-01 20:26 Alex Nemirovsky
  2020-06-01 20:26 ` [PATCH v9 2/2] board: presidio-asic: Add SPI NOR support Alex Nemirovsky
  2020-06-17 20:12 ` [PATCH v9 1/2] spi: ca_sflash: Add CAxxxx SPI Flash Controller Alex Nemirovsky
  0 siblings, 2 replies; 4+ messages in thread
From: Alex Nemirovsky @ 2020-06-01 20:26 UTC (permalink / raw)
  To: u-boot

From: Pengpeng Chen <pengpeng.chen@cortina-access.com>

Add SPI Flash controller driver for Cortina Access
CAxxxx SoCs

Signed-off-by: Pengpeng Chen <pengpeng.chen@cortina-access.com>
Signed-off-by: Alex Nemirovsky <alex.nemirovsky@cortina-access.com>
CC: Jagan Teki <jagan@amarulasolutions.com>
CC: Vignesh R <vigneshr@ti.com>
CC: Tom Rini <trini@konsulko.com>

---

Changes in v9:
- Clean up MAINTAINERS changes

Changes in v8:
- No code change
- Split out individual driver from Cortina Package 2 patch series
to help streamline acceptence into master

Changes in v7:
- Replace substring "OPCODE" with "OP" in MACROs to help
reduce code line lengths
- Replace substring "_MASK" with "_MSK" in MACROs to help
reduce code line lengths

Changes in v5: None
Changes in v3:
- Fixup syntax issues related to checkpatch.pl cleanup

 MAINTAINERS             |   2 +
 drivers/spi/Kconfig     |   8 +
 drivers/spi/Makefile    |   1 +
 drivers/spi/ca_sflash.c | 576 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 587 insertions(+)
 create mode 100644 drivers/spi/ca_sflash.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 8add9d4..a503f98 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -181,6 +181,7 @@ F:	drivers/gpio/cortina_gpio.c
 F:	drivers/watchdog/cortina_wdt.c
 F:	drivers/serial/serial_cortina.c
 F:	drivers/mmc/ca_dw_mmc.c
+F:	drivers/spi/ca_sflash.c
 
 ARM/CZ.NIC TURRIS MOX SUPPORT
 M:	Marek Behun <marek.behun@nic.cz>
@@ -732,6 +733,7 @@ F:	drivers/gpio/cortina_gpio.c
 F:	drivers/watchdog/cortina_wdt.c
 F:	drivers/serial/serial_cortina.c
 F:	drivers/mmc/ca_dw_mmc.c
+F:	drivers/spi/ca_sflash.c
 
 MIPS MSCC
 M:	Gregory CLEMENT <gregory.clement@bootlin.com>
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index dccd5ea..09f2a2a 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -106,6 +106,14 @@ config BCMSTB_SPI
 	  be used to access the SPI flash on platforms embedding this
 	  Broadcom SPI core.
 
+config CORTINA_SFLASH
+	bool "Cortina-Access Serial Flash controller driver"
+	depends on DM_SPI && SPI_MEM
+	help
+	  Enable the Cortina-Access Serial Flash controller driver. This driver
+	  can be used to access the SPI NOR/NAND flash on platforms embedding this
+	  Cortina-Access IP core.
+
 config CADENCE_QSPI
 	bool "Cadence QSPI driver"
 	help
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 6441694..5e53f11 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_BCM63XX_SPI) += bcm63xx_spi.o
 obj-$(CONFIG_BCMSTB_SPI) += bcmstb_spi.o
 obj-$(CONFIG_CADENCE_QSPI) += cadence_qspi.o cadence_qspi_apb.o
 obj-$(CONFIG_CF_SPI) += cf_spi.o
+obj-$(CONFIG_CORTINA_SFLASH) += ca_sflash.o
 obj-$(CONFIG_DAVINCI_SPI) += davinci_spi.o
 obj-$(CONFIG_DESIGNWARE_SPI) += designware_spi.o
 obj-$(CONFIG_EXYNOS_SPI) += exynos_spi.o
diff --git a/drivers/spi/ca_sflash.c b/drivers/spi/ca_sflash.c
new file mode 100644
index 0000000..00af6bf
--- /dev/null
+++ b/drivers/spi/ca_sflash.c
@@ -0,0 +1,576 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for Cortina SPI-FLASH Controller
+ *
+ * Copyright (C) 2020 Cortina Access Inc. All Rights Reserved.
+ *
+ * Author: PengPeng Chen <pengpeng.chen@cortina-access.com>
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <clk.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <linux/compat.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/ioport.h>
+#include <linux/sizes.h>
+#include <spi.h>
+#include <spi-mem.h>
+#include <reset.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct ca_sflash_regs {
+	u32 idr;		/* 0x00:Flash word ID Register */
+	u32 tc;			/* 0x04:Flash Timeout Counter Register */
+	u32 sr;			/* 0x08:Flash Status Register */
+	u32 tr;			/* 0x0C:Flash Type Register */
+	u32 asr;		/* 0x10:Flash ACCESS START/BUSY Register */
+	u32 isr;		/* 0x14:Flash Interrupt Status Register */
+	u32 imr;		/* 0x18:Flash Interrupt Mask Register */
+	u32 fcr;		/* 0x1C:NAND Flash FIFO Control Register */
+	u32 ffsr;		/* 0x20:Flash FIFO Status Register */
+	u32 ffar;		/* 0x24:Flash FIFO ADDRESS Register */
+	u32 ffmar;		/* 0x28:Flash FIFO MATCHING ADDRESS Register */
+	u32 ffdr;		/* 0x2C:Flash FIFO Data Register */
+	u32 ar;			/* 0x30:Serial Flash Access Register */
+	u32 ear;		/* 0x34:Serial Flash Extend Access Register */
+	u32 adr;		/* 0x38:Serial Flash ADdress Register */
+	u32 dr;			/* 0x3C:Serial Flash Data Register */
+	u32 tmr;		/* 0x40:Serial Flash Timing Register */
+};
+
+/*
+ * FLASH_TYPE
+ */
+#define CA_FLASH_TR_PIN			BIT(15)
+#define CA_FLASH_TR_TYPE_MSK		GENMASK(14, 12)
+#define CA_FLASH_TR_TYPE(tp)		(((tp) << 12) & CA_FLASH_TR_TYPE_MSK)
+#define CA_FLASH_TR_WIDTH			BIT(11)
+#define CA_FLASH_TR_SIZE_MSK		GENMASK(10, 9)
+#define CA_FLASH_TR_SIZE(sz)		(((sz) << 9) & CA_FLASH_TR_SIZE_MSK)
+
+/*
+ * FLASH_FLASH_ACCESS_START
+ */
+#define CA_FLASH_ASR_IND_START_EN	BIT(1)
+#define CA_FLASH_ASR_DMA_START_EN	BIT(3)
+#define CA_FLASH_ASR_WR_ACCESS_EN	BIT(9)
+
+/*
+ * FLASH_FLASH_INTERRUPT
+ */
+#define CA_FLASH_ISR_REG_IRQ		BIT(1)
+#define CA_FLASH_ISR_FIFO_IRQ		BIT(2)
+
+/*
+ * FLASH_SF_ACCESS
+ */
+#define CA_SF_AR_OP_MSK		GENMASK(7, 0)
+#define CA_SF_AR_OP(op)		((op) << 0 & CA_SF_AR_OP_MSK)
+#define CA_SF_AR_ACCODE_MSK		GENMASK(11, 8)
+#define CA_SF_AR_ACCODE(ac)		(((ac) << 8) & CA_SF_AR_ACCODE_MSK)
+#define CA_SF_AR_FORCE_TERM		BIT(12)
+#define CA_SF_AR_FORCE_BURST		BIT(13)
+#define CA_SF_AR_AUTO_MODE_EN		BIT(15)
+#define CA_SF_AR_CHIP_EN_ALT		BIT(16)
+#define CA_SF_AR_HI_SPEED_RD		BIT(17)
+#define CA_SF_AR_MIO_INF_DC		BIT(24)
+#define CA_SF_AR_MIO_INF_AC		BIT(25)
+#define CA_SF_AR_MIO_INF_CC		BIT(26)
+#define CA_SF_AR_DDR_MSK		GENMASK(29, 28)
+#define CA_SF_AR_DDR(ddr)		(((ddr) << 28) & CA_SF_AR_DDR_MSK)
+#define CA_SF_AR_MIO_INF_MSK		GENMASK(31, 30)
+#define CA_SF_AR_MIO_INF(io)		(((io) << 30) & CA_SF_AR_MIO_INF_MSK)
+
+/*
+ * FLASH_SF_EXT_ACCESS
+ */
+#define CA_SF_EAR_OP_MSK		GENMASK(7, 0)
+#define CA_SF_EAR_OP(op)		(((op) << 0) & CA_SF_EAR_OP_MSK)
+#define CA_SF_EAR_DATA_CNT_MSK		GENMASK(20, 8)
+#define CA_SF_EAR_DATA_CNT(cnt)		(((cnt) << 8) & CA_SF_EAR_DATA_CNT_MSK)
+#define CA_SF_EAR_DATA_CNT_MAX		(4096)
+#define CA_SF_EAR_ADDR_CNT_MSK		GENMASK(23, 21)
+#define CA_SF_EAR_ADDR_CNT(cnt)		(((cnt) << 21) & CA_SF_EAR_ADDR_CNT_MSK)
+#define CA_SF_EAR_ADDR_CNT_MAX		(5)
+#define CA_SF_EAR_DUMY_CNT_MSK		GENMASK(29, 24)
+#define CA_SF_EAR_DUMY_CNT(cnt)		(((cnt) << 24) & CA_SF_EAR_DUMY_CNT_MSK)
+#define CA_SF_EAR_DUMY_CNT_MAX		(32)
+#define CA_SF_EAR_DRD_CMD_EN		BIT(31)
+
+/*
+ * FLASH_SF_ADDRESS
+ */
+#define CA_SF_ADR_REG_MSK		GENMASK(31, 0)
+#define CA_SF_ADR_REG(addr)		(((addr) << 0) & CA_SF_ADR_REG_MSK)
+
+/*
+ * FLASH_SF_DATA
+ */
+#define CA_SF_DR_REG_MSK		GENMASK(31, 0)
+#define CA_SF_DR_REG(addr)		(((addr) << 0) & CA_SF_DR_REG_MSK)
+
+/*
+ * FLASH_SF_TIMING
+ */
+#define CA_SF_TMR_IDLE_MSK		GENMASK(7, 0)
+#define CA_SF_TMR_IDLE(idle)		(((idle) << 0) & CA_SF_TMR_IDLE_MSK)
+#define CA_SF_TMR_HOLD_MSK		GENMASK(15, 8)
+#define CA_SF_TMR_HOLD(hold)		(((hold) << 8) & CA_SF_TMR_HOLD_MSK)
+#define CA_SF_TMR_SETUP_MSK		GENMASK(23, 16)
+#define CA_SF_TMR_SETUP(setup)		(((setup) << 16) & CA_SF_TMR_SETUP_MSK)
+#define CA_SF_TMR_CLK_MSK		GENMASK(26, 24)
+#define CA_SF_TMR_CLK(clk)		(((clk) << 24) & CA_SF_TMR_CLK_MSK)
+
+#define CA_SFLASH_IND_WRITE		0
+#define CA_SFLASH_IND_READ		1
+#define CA_SFLASH_MEM_MAP		3
+#define CA_SFLASH_FIFO_TIMEOUT_US	30000
+#define CA_SFLASH_BUSY_TIMEOUT_US	40000
+
+#define CA_SF_AC_OP			0x00
+#define CA_SF_AC_OP_1_DATA		0x01
+#define CA_SF_AC_OP_2_DATA		0x02
+#define CA_SF_AC_OP_3_DATA		0x03
+#define CA_SF_AC_OP_4_DATA		0x04
+#define CA_SF_AC_OP_3_ADDR		0x05
+#define CA_SF_AC_OP_4_ADDR		(CA_SF_AC_OP_3_ADDR)
+#define CA_SF_AC_OP_3_ADDR_1_DATA	0x06
+#define CA_SF_AC_OP_4_ADDR_1_DATA	(CA_SF_AC_OP_3_ADDR_1_DATA << 2)
+#define CA_SF_AC_OP_3_ADDR_2_DATA	0x07
+#define CA_SF_AC_OP_4_ADDR_2_DATA	(CA_SF_AC_OP_3_ADDR_2_DATA << 2)
+#define CA_SF_AC_OP_3_ADDR_3_DATA	0x08
+#define CA_SF_AC_OP_4_ADDR_3_DATA	(CA_SF_AC_OP_3_ADDR_3_DATA << 2)
+#define CA_SF_AC_OP_3_ADDR_4_DATA	0x09
+#define CA_SF_AC_OP_4_ADDR_4_DATA	(CA_SF_AC_OP_3_ADDR_4_DATA << 2)
+#define CA_SF_AC_OP_3_ADDR_X_1_DATA	0x0A
+#define CA_SF_AC_OP_4_ADDR_X_1_DATA	(CA_SF_AC_OP_3_ADDR_X_1_DATA << 2)
+#define CA_SF_AC_OP_3_ADDR_X_2_DATA	0x0B
+#define CA_SF_AC_OP_4_ADDR_X_2_DATA	(CA_SF_AC_OP_3_ADDR_X_2_DATA << 2)
+#define CA_SF_AC_OP_3_ADDR_X_3_DATA	0x0C
+#define CA_SF_AC_OP_4_ADDR_X_3_DATA	(CA_SF_AC_OP_3_ADDR_X_3_DATA << 2)
+#define CA_SF_AC_OP_3_ADDR_X_4_DATA	0x0D
+#define CA_SF_AC_OP_4_ADDR_X_4_DATA	(CA_SF_AC_OP_3_ADDR_X_4_DATA << 2)
+#define CA_SF_AC_OP_3_ADDR_4X_1_DATA	0x0E
+#define CA_SF_AC_OP_4_ADDR_4X_1_DATA	(CA_SF_AC_OP_3_ADDR_4X_1_DATA << 2)
+#define CA_SF_AC_OP_EXTEND		0x0F
+
+#define CA_SF_ACCESS_MIO_SINGLE		0
+#define CA_SF_ACCESS_MIO_DUAL		1
+#define CA_SF_ACCESS_MIO_QUARD		2
+
+enum access_type {
+	RD_ACCESS,
+	WR_ACCESS,
+};
+
+struct ca_sflash_priv {
+	struct ca_sflash_regs *regs;
+	u8 rx_width;
+	u8 tx_width;
+};
+
+/*
+ * This function doesn't do anything except help with debugging
+ */
+static int ca_sflash_claim_bus(struct udevice *dev)
+{
+	debug("%s:\n", __func__);
+	return 0;
+}
+
+static int ca_sflash_release_bus(struct udevice *dev)
+{
+	debug("%s:\n", __func__);
+	return 0;
+}
+
+static int ca_sflash_set_speed(struct udevice *dev, uint speed)
+{
+	debug("%s:\n", __func__);
+	return 0;
+}
+
+static int ca_sflash_set_mode(struct udevice *dev, uint mode)
+{
+	struct ca_sflash_priv *priv = dev_get_priv(dev);
+
+	if (mode & SPI_RX_QUAD)
+		priv->rx_width = 4;
+	else if (mode & SPI_RX_DUAL)
+		priv->rx_width = 2;
+	else
+		priv->rx_width = 1;
+
+	if (mode & SPI_TX_QUAD)
+		priv->tx_width = 4;
+	else if (mode & SPI_TX_DUAL)
+		priv->tx_width = 2;
+	else
+		priv->tx_width = 1;
+
+	debug("%s: mode=%d, rx_width=%d, tx_width=%d\n",
+	      __func__, mode, priv->rx_width, priv->tx_width);
+
+	return 0;
+}
+
+static int _ca_sflash_wait_for_not_busy(struct ca_sflash_priv *priv)
+{
+	u32 asr;
+
+	if (readl_poll_timeout(&priv->regs->asr, asr,
+			       !(asr & CA_FLASH_ASR_IND_START_EN),
+			       CA_SFLASH_BUSY_TIMEOUT_US)) {
+		pr_err("busy timeout (stat:%#x)\n", asr);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int _ca_sflash_wait_cmd(struct ca_sflash_priv *priv,
+			       enum access_type type)
+{
+	if (type == WR_ACCESS) {
+		/* Enable write access and start the sflash indirect access */
+		clrsetbits_le32(&priv->regs->asr, GENMASK(31, 0),
+				CA_FLASH_ASR_WR_ACCESS_EN
+				| CA_FLASH_ASR_IND_START_EN);
+	} else if (type == RD_ACCESS) {
+		/* Start the sflash indirect access */
+		clrsetbits_le32(&priv->regs->asr, GENMASK(31, 0),
+				CA_FLASH_ASR_IND_START_EN);
+	} else {
+		printf("%s: !error access type.\n", __func__);
+		return -1;
+	}
+
+	/* Wait til the action(rd/wr) completed */
+	return _ca_sflash_wait_for_not_busy(priv);
+}
+
+static int _ca_sflash_read(struct ca_sflash_priv *priv,
+			   u8 *buf, unsigned int data_len)
+{
+	u32 reg_data;
+	int len;
+
+	len = data_len;
+	while (len >= 4) {
+		if (_ca_sflash_wait_cmd(priv, RD_ACCESS))
+			return -1;
+		reg_data = readl(&priv->regs->dr);
+		*buf++ = reg_data & 0xFF;
+		*buf++ = (reg_data >> 8) & 0xFF;
+		*buf++ = (reg_data >> 16) & 0xFF;
+		*buf++ = (reg_data >> 24) & 0xFF;
+		len -= 4;
+		debug("%s: reg_data=%#08x\n",
+		      __func__, reg_data);
+	}
+
+	if (len > 0) {
+		if (_ca_sflash_wait_cmd(priv, RD_ACCESS))
+			return -1;
+		reg_data = readl(&priv->regs->dr);
+		debug("%s: reg_data=%#08x\n",
+		      __func__, reg_data);
+	}
+
+	switch (len) {
+	case 3:
+		*buf++ = reg_data & 0xFF;
+		*buf++ = (reg_data >> 8) & 0xFF;
+		*buf++ = (reg_data >> 16) & 0xFF;
+		break;
+	case 2:
+		*buf++ = reg_data & 0xFF;
+		*buf++ = (reg_data >> 8) & 0xFF;
+		break;
+	case 1:
+		*buf++ = reg_data & 0xFF;
+		break;
+	case 0:
+		break;
+	default:
+		printf("%s: error data_length %d!\n", __func__, len);
+	}
+
+	return 0;
+}
+
+static int _ca_sflash_mio_set(struct ca_sflash_priv *priv,
+			      u8 width)
+{
+	if (width == 4) {
+		setbits_le32(&priv->regs->ar,
+			     CA_SF_AR_MIO_INF_DC
+			     | CA_SF_AR_MIO_INF(CA_SF_ACCESS_MIO_QUARD)
+			     | CA_SF_AR_FORCE_BURST);
+	} else if (width == 2) {
+		setbits_le32(&priv->regs->ar,
+			     CA_SF_AR_MIO_INF_DC
+			     | CA_SF_AR_MIO_INF(CA_SF_ACCESS_MIO_DUAL)
+			     | CA_SF_AR_FORCE_BURST);
+	} else if (width == 1) {
+		setbits_le32(&priv->regs->ar,
+			     CA_SF_AR_MIO_INF(CA_SF_ACCESS_MIO_SINGLE)
+			     | CA_SF_AR_FORCE_BURST);
+	} else {
+		printf("%s: error rx/tx width  %d!\n", __func__, width);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int _ca_sflash_write(struct ca_sflash_priv *priv,
+			    u8 *buf, unsigned int data_len)
+{
+	u32 reg_data;
+	int len;
+
+	len = data_len;
+	while (len > 0) {
+		reg_data = buf[0]
+			| (buf[1] << 8)
+			| (buf[2] << 16)
+			| (buf[3] << 24);
+
+		debug("%s: reg_data=%#08x\n",
+		      __func__, reg_data);
+		/* Fill data */
+		clrsetbits_le32(&priv->regs->dr, GENMASK(31, 0), reg_data);
+
+		if (_ca_sflash_wait_cmd(priv, WR_ACCESS))
+			return -1;
+
+		len -= 4;
+		buf += 4;
+	}
+
+	return 0;
+}
+
+static int _ca_sflash_access_data(struct ca_sflash_priv *priv,
+				  struct spi_mem_op *op)
+{
+	int total_cnt;
+	unsigned int len;
+	unsigned int data_cnt = op->data.nbytes;
+	u64 addr_offset = op->addr.val;
+	u8 addr_cnt = op->addr.nbytes;
+	u8 *data_buf = NULL;
+	u8 *buf = NULL;
+
+	if (op->data.dir == SPI_MEM_DATA_IN)
+		data_buf = (u8 *)op->data.buf.in;
+	else
+		data_buf = (u8 *)op->data.buf.out;
+
+	if (data_cnt > CA_SF_EAR_DATA_CNT_MAX)
+		buf = malloc(CA_SF_EAR_DATA_CNT_MAX);
+	else
+		buf = malloc(data_cnt);
+
+	total_cnt = data_cnt;
+	while (total_cnt > 0) {
+		/* Fill address */
+		if (addr_cnt > 0)
+			clrsetbits_le32(&priv->regs->adr,
+					GENMASK(31, 0), (u32)addr_offset);
+
+		if (total_cnt > CA_SF_EAR_DATA_CNT_MAX) {
+			len = CA_SF_EAR_DATA_CNT_MAX;
+			addr_offset += CA_SF_EAR_DATA_CNT_MAX;
+			/* Clear start bit before next bulk read */
+			clrbits_le32(&priv->regs->asr, GENMASK(31, 0));
+		} else {
+			len = total_cnt;
+		}
+
+		memset(buf, 0, len);
+		if (op->data.dir == SPI_MEM_DATA_IN) {
+			if (_ca_sflash_read(priv, buf, len))
+				break;
+			memcpy(data_buf, buf, len);
+		} else {
+			memcpy(buf, data_buf, len);
+			if (_ca_sflash_write(priv, buf, len))
+				break;
+		}
+
+		total_cnt -= len;
+		data_buf += len;
+	}
+	if (buf)
+		free(buf);
+
+	return total_cnt > 0 ? -1 : 0;
+}
+
+static int _ca_sflash_issue_cmd(struct ca_sflash_priv *priv,
+				struct spi_mem_op *op, u8 opcode)
+{
+	u8 dummy_cnt = op->dummy.nbytes;
+	u8 addr_cnt = op->addr.nbytes;
+	u8 mio_width;
+	unsigned int data_cnt = op->data.nbytes;
+	u64 addr_offset = op->addr.val;
+
+	/* Set the access register */
+	clrsetbits_le32(&priv->regs->ar,
+			GENMASK(31, 0), CA_SF_AR_ACCODE(opcode));
+
+	if (opcode == CA_SF_AC_OP_EXTEND) { /* read_data, write_data */
+		if (data_cnt > 6) {
+			if (op->data.dir == SPI_MEM_DATA_IN)
+				mio_width = priv->rx_width;
+			else
+				mio_width = priv->tx_width;
+			if (_ca_sflash_mio_set(priv, mio_width))
+				return -1;
+		}
+		debug("%s: FLASH ACCESS reg=%#08x\n",
+		      __func__, readl(&priv->regs->ar));
+
+		/* Use command in extend_access register */
+		clrsetbits_le32(&priv->regs->ear,
+				GENMASK(31, 0), CA_SF_EAR_OP(op->cmd.opcode)
+				| CA_SF_EAR_DUMY_CNT(dummy_cnt * 8 - 1)
+				| CA_SF_EAR_ADDR_CNT(addr_cnt - 1)
+				| CA_SF_EAR_DATA_CNT(4 - 1)
+				| CA_SF_EAR_DRD_CMD_EN);
+		debug("%s: FLASH EXT ACCESS reg=%#08x\n",
+		      __func__, readl(&priv->regs->ear));
+
+		if (_ca_sflash_access_data(priv, op))
+			return -1;
+	} else { /* reset_op, wr_enable, wr_disable */
+		setbits_le32(&priv->regs->ar,
+			     CA_SF_AR_OP(op->cmd.opcode));
+		debug("%s: FLASH ACCESS reg=%#08x\n",
+		      __func__, readl(&priv->regs->ar));
+
+		if (opcode == CA_SF_AC_OP_4_ADDR) { /* erase_op */
+			/* Configure address length */
+			if (addr_cnt > 3)	/* 4 Bytes address */
+				setbits_le32(&priv->regs->tr,
+					     CA_FLASH_TR_SIZE(2));
+			else				/* 3 Bytes address */
+				clrbits_le32(&priv->regs->tr,
+					     CA_FLASH_TR_SIZE_MSK);
+
+			/* Fill address */
+			if (addr_cnt > 0)
+				clrsetbits_le32(&priv->regs->adr,
+						GENMASK(31, 0),
+						(u32)addr_offset);
+		}
+
+		if (_ca_sflash_wait_cmd(priv, RD_ACCESS))
+			return -1;
+	}
+	/* elapse 10us before issuing any other command */
+	udelay(10);
+
+	return 0;
+}
+
+static int ca_sflash_exec_op(struct spi_slave *slave,
+			     const struct spi_mem_op *op)
+{
+	struct ca_sflash_priv *priv = dev_get_priv(slave->dev->parent);
+	u8 opcode;
+
+	debug("%s: cmd:%#02x addr.val:%#llx addr.len:%#x data.len:%#x data.dir:%#x\n",
+	      __func__, op->cmd.opcode, op->addr.val,
+	      op->addr.nbytes, op->data.nbytes, op->data.dir);
+
+	if (op->data.nbytes == 0 && op->addr.nbytes == 0) {
+		opcode = CA_SF_AC_OP;
+	} else if (op->data.nbytes == 0 && op->addr.nbytes > 0) {
+		opcode = CA_SF_AC_OP_4_ADDR;
+	} else if (op->data.nbytes > 0) {
+		opcode = CA_SF_AC_OP_EXTEND;
+	} else {
+		printf("%s: can't support cmd.opcode:(%#02x) type currently!\n",
+		       __func__, op->cmd.opcode);
+		return -1;
+	}
+
+	return _ca_sflash_issue_cmd(priv, (struct spi_mem_op *)op, opcode);
+}
+
+static void ca_sflash_init(struct ca_sflash_priv *priv)
+{
+	/* Set FLASH_TYPE as serial flash, value: 0x0400*/
+	clrsetbits_le32(&priv->regs->tr,
+			GENMASK(31, 0), CA_FLASH_TR_SIZE(2));
+	debug("%s: FLASH_TYPE reg=%#x\n",
+	      __func__, readl(&priv->regs->tr));
+
+	/* Minimize flash timing, value: 0x07010101 */
+	clrsetbits_le32(&priv->regs->tmr,
+			GENMASK(31, 0),
+			CA_SF_TMR_CLK(0x07)
+			| CA_SF_TMR_SETUP(0x01)
+			| CA_SF_TMR_HOLD(0x01)
+			| CA_SF_TMR_IDLE(0x01));
+	debug("%s: FLASH_TIMING reg=%#x\n",
+	      __func__, readl(&priv->regs->tmr));
+}
+
+static int ca_sflash_probe(struct udevice *dev)
+{
+	struct ca_sflash_priv *priv = dev_get_priv(dev);
+	struct resource res;
+	int ret;
+
+	/* Map the registers */
+	ret = dev_read_resource_byname(dev, "sflash-regs", &res);
+	if (ret) {
+		dev_err(dev, "can't get regs base addresses(ret = %d)!\n", ret);
+		return ret;
+	}
+	priv->regs = devm_ioremap(dev, res.start, resource_size(&res));
+	if (IS_ERR(priv->regs))
+		return PTR_ERR(priv->regs);
+
+	ca_sflash_init(priv);
+
+	printf("SFLASH: Controller probed ready\n");
+	return 0;
+}
+
+static const struct spi_controller_mem_ops ca_sflash_mem_ops = {
+	.exec_op = ca_sflash_exec_op,
+};
+
+static const struct dm_spi_ops ca_sflash_ops = {
+	.claim_bus = ca_sflash_claim_bus,
+	.release_bus = ca_sflash_release_bus,
+	.set_speed = ca_sflash_set_speed,
+	.set_mode = ca_sflash_set_mode,
+	.mem_ops = &ca_sflash_mem_ops,
+};
+
+static const struct udevice_id ca_sflash_ids[] = {
+	{.compatible = "cortina,ca-sflash"},
+	{}
+};
+
+U_BOOT_DRIVER(ca_sflash) = {
+	.name = "ca_sflash",
+	.id = UCLASS_SPI,
+	.of_match = ca_sflash_ids,
+	.ops = &ca_sflash_ops,
+	.priv_auto_alloc_size = sizeof(struct ca_sflash_priv),
+	.probe = ca_sflash_probe,
+};
-- 
2.7.4

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