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Subject[PATCH v12 2/4] mtd: spi-nor: add spi-mem support in cadence-quadspi controller driver
Date
From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>

This patch adds a spi-mem framework adaptation over cadence-quadspi driver.

Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
---
drivers/mtd/spi-nor/cadence-quadspi.c | 538 +++++++++++++---------------------
1 file changed, 209 insertions(+), 329 deletions(-)

diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
index 494dcab4aaaa..7b52e109036e 100644
--- a/drivers/mtd/spi-nor/cadence-quadspi.c
+++ b/drivers/mtd/spi-nor/cadence-quadspi.c
@@ -3,6 +3,8 @@
* Driver for Cadence QSPI Controller
*
* Copyright Altera Corporation (C) 2012-2014. All rights reserved.
+ * Copyright Intel Corporation (C) 2019-2020. All rights reserved.
+ * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
*/
#include <linux/clk.h>
#include <linux/completion.h>
@@ -17,9 +19,6 @@
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/partitions.h>
-#include <linux/mtd/spi-nor.h>
#include <linux/of_device.h>
#include <linux/of.h>
#include <linux/platform_device.h>
@@ -27,6 +26,7 @@
#include <linux/reset.h>
#include <linux/sched.h>
#include <linux/spi/spi.h>
+#include <linux/spi/spi-mem.h>
#include <linux/timer.h>

#define CQSPI_NAME "cadence-qspi"
@@ -34,17 +34,14 @@

/* Quirks */
#define CQSPI_NEEDS_WR_DELAY BIT(0)
+#define CQSPI_DISABLE_DAC_MODE BIT(1)

-/* Capabilities mask */
-#define CQSPI_BASE_HWCAPS_MASK \
- (SNOR_HWCAPS_READ | SNOR_HWCAPS_READ_FAST | \
- SNOR_HWCAPS_READ_1_1_2 | SNOR_HWCAPS_READ_1_1_4 | \
- SNOR_HWCAPS_PP)
+/* Capabilities*/
+#define CQSPI_SUPPORTS_OCTAL BIT(0)

struct cqspi_st;

struct cqspi_flash_pdata {
- struct spi_nor nor;
struct cqspi_st *cqspi;
u32 clk_rate;
u32 read_delay;
@@ -57,7 +54,6 @@ struct cqspi_flash_pdata {
u8 data_width;
u8 cs;
bool registered;
- bool use_direct_mode;
};

struct cqspi_st {
@@ -70,23 +66,20 @@ struct cqspi_st {
void __iomem *ahb_base;
resource_size_t ahb_size;
struct completion transfer_complete;
- struct mutex bus_mutex;

struct dma_chan *rx_chan;
struct completion rx_dma_complete;
dma_addr_t mmap_phys_base;

int current_cs;
- int current_page_size;
- int current_erase_size;
- int current_addr_width;
- unsigned long master_ref_clk_hz;
bool is_decoded_cs;
+ unsigned long master_ref_clk_hz;
u32 fifo_depth;
u32 fifo_width;
bool rclk_en;
u32 trigger_address;
u32 wr_delay;
+ bool use_dac_mode;
struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT];
};

@@ -181,6 +174,9 @@ struct cqspi_driver_platdata {
#define CQSPI_REG_SDRAMLEVEL_RD_MASK 0xFFFF
#define CQSPI_REG_SDRAMLEVEL_WR_MASK 0xFFFF

+#define CQSPI_REG_WR_COMPLETION_CTRL 0x38
+#define CQSPI_REG_WR_DISABLE_AUTO_POLL BIT(14)
+
#define CQSPI_REG_IRQSTATUS 0x40
#define CQSPI_REG_IRQMASK 0x44

@@ -285,9 +281,8 @@ static irqreturn_t cqspi_irq_handler(int this_irq, void *dev)
return IRQ_HANDLED;
}

-static unsigned int cqspi_calc_rdreg(struct spi_nor *nor)
+static unsigned int cqspi_calc_rdreg(struct cqspi_flash_pdata *f_pdata)
{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
u32 rdreg = 0;

rdreg |= f_pdata->inst_width << CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB;
@@ -354,19 +349,21 @@ static int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg)
return cqspi_wait_idle(cqspi);
}

-static int cqspi_command_read(struct spi_nor *nor, u8 opcode,
- u8 *rxbuf, size_t n_rx)
+static int cqspi_command_read(struct cqspi_flash_pdata *f_pdata,
+ const struct spi_mem_op *op)
{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
struct cqspi_st *cqspi = f_pdata->cqspi;
void __iomem *reg_base = cqspi->iobase;
+ u8 *rxbuf = op->data.buf.in;
+ u8 opcode = op->cmd.opcode;
+ size_t n_rx = op->data.nbytes;
unsigned int rdreg;
unsigned int reg;
size_t read_len;
int status;

if (!n_rx || n_rx > CQSPI_STIG_DATA_LEN_MAX || !rxbuf) {
- dev_err(nor->dev,
+ dev_err(&cqspi->pdev->dev,
"Invalid input argument, len %zu rxbuf 0x%p\n",
n_rx, rxbuf);
return -EINVAL;
@@ -374,7 +371,7 @@ static int cqspi_command_read(struct spi_nor *nor, u8 opcode,

reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;

- rdreg = cqspi_calc_rdreg(nor);
+ rdreg = cqspi_calc_rdreg(f_pdata);
writel(rdreg, reg_base + CQSPI_REG_RD_INSTR);

reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB);
@@ -403,25 +400,35 @@ static int cqspi_command_read(struct spi_nor *nor, u8 opcode,
return 0;
}

-static int cqspi_command_write(struct spi_nor *nor, const u8 opcode,
- const u8 *txbuf, size_t n_tx)
+static int cqspi_command_write(struct cqspi_flash_pdata *f_pdata,
+ const struct spi_mem_op *op)
{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
struct cqspi_st *cqspi = f_pdata->cqspi;
void __iomem *reg_base = cqspi->iobase;
+ const u8 opcode = op->cmd.opcode;
+ const u8 *txbuf = op->data.buf.out;
+ size_t n_tx = op->data.nbytes;
unsigned int reg;
unsigned int data;
size_t write_len;
- int ret;

if (n_tx > CQSPI_STIG_DATA_LEN_MAX || (n_tx && !txbuf)) {
- dev_err(nor->dev,
+ dev_err(&cqspi->pdev->dev,
"Invalid input argument, cmdlen %zu txbuf 0x%p\n",
n_tx, txbuf);
return -EINVAL;
}

reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+
+ if (op->addr.nbytes) {
+ reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB);
+ reg |= ((op->addr.nbytes - 1) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK)
+ << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;
+
+ writel(op->addr.val, reg_base + CQSPI_REG_CMDADDRESS);
+ }
+
if (n_tx) {
reg |= (0x1 << CQSPI_REG_CMDCTRL_WR_EN_LSB);
reg |= ((n_tx - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK)
@@ -439,73 +446,46 @@ static int cqspi_command_write(struct spi_nor *nor, const u8 opcode,
writel(data, reg_base + CQSPI_REG_CMDWRITEDATAUPPER);
}
}
- ret = cqspi_exec_flash_cmd(cqspi, reg);
- return ret;
-}
-
-static int cqspi_command_write_addr(struct spi_nor *nor,
- const u8 opcode, const unsigned int addr)
-{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
- struct cqspi_st *cqspi = f_pdata->cqspi;
- void __iomem *reg_base = cqspi->iobase;
- unsigned int reg;
-
- reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
- reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB);
- reg |= ((nor->addr_width - 1) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK)
- << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;
-
- writel(addr, reg_base + CQSPI_REG_CMDADDRESS);

return cqspi_exec_flash_cmd(cqspi, reg);
}

-static int cqspi_read_setup(struct spi_nor *nor)
+static int cqspi_read_setup(struct cqspi_flash_pdata *f_pdata,
+ const struct spi_mem_op *op)
{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
struct cqspi_st *cqspi = f_pdata->cqspi;
void __iomem *reg_base = cqspi->iobase;
unsigned int dummy_clk = 0;
unsigned int reg;

- reg = nor->read_opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB;
- reg |= cqspi_calc_rdreg(nor);
+ reg = op->cmd.opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB;
+ reg |= cqspi_calc_rdreg(f_pdata);

/* Setup dummy clock cycles */
- dummy_clk = nor->read_dummy;
+ dummy_clk = op->dummy.nbytes * 8;
if (dummy_clk > CQSPI_DUMMY_CLKS_MAX)
dummy_clk = CQSPI_DUMMY_CLKS_MAX;

- if (dummy_clk / 8) {
- reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB);
- /* Set mode bits high to ensure chip doesn't enter XIP */
- writel(0xFF, reg_base + CQSPI_REG_MODE_BIT);
-
- /* Need to subtract the mode byte (8 clocks). */
- if (f_pdata->inst_width != CQSPI_INST_TYPE_QUAD)
- dummy_clk -= 8;
-
- if (dummy_clk)
- reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK)
- << CQSPI_REG_RD_INSTR_DUMMY_LSB;
- }
+ if (dummy_clk / 8)
+ reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK)
+ << CQSPI_REG_RD_INSTR_DUMMY_LSB;

writel(reg, reg_base + CQSPI_REG_RD_INSTR);

/* Set address width */
reg = readl(reg_base + CQSPI_REG_SIZE);
reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
- reg |= (nor->addr_width - 1);
+ reg |= (op->addr.nbytes - 1);
writel(reg, reg_base + CQSPI_REG_SIZE);
return 0;
}

-static int cqspi_indirect_read_execute(struct spi_nor *nor, u8 *rxbuf,
- loff_t from_addr, const size_t n_rx)
+static int cqspi_indirect_read_execute(struct cqspi_flash_pdata *f_pdata,
+ u8 *rxbuf, loff_t from_addr,
+ const size_t n_rx)
{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
struct cqspi_st *cqspi = f_pdata->cqspi;
+ struct device *dev = &cqspi->pdev->dev;
void __iomem *reg_base = cqspi->iobase;
void __iomem *ahb_base = cqspi->ahb_base;
unsigned int remaining = n_rx;
@@ -528,13 +508,13 @@ static int cqspi_indirect_read_execute(struct spi_nor *nor, u8 *rxbuf,

while (remaining > 0) {
if (!wait_for_completion_timeout(&cqspi->transfer_complete,
- msecs_to_jiffies(CQSPI_READ_TIMEOUT_MS)))
+ msecs_to_jiffies(CQSPI_READ_TIMEOUT_MS)))
ret = -ETIMEDOUT;

bytes_to_read = cqspi_get_rd_sram_level(cqspi);

if (ret && bytes_to_read == 0) {
- dev_err(nor->dev, "Indirect read timeout, no bytes\n");
+ dev_err(dev, "Indirect read timeout, no bytes\n");
goto failrd;
}

@@ -570,8 +550,7 @@ static int cqspi_indirect_read_execute(struct spi_nor *nor, u8 *rxbuf,
ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_INDIRECTRD,
CQSPI_REG_INDIRECTRD_DONE_MASK, 0);
if (ret) {
- dev_err(nor->dev,
- "Indirect read completion error (%i)\n", ret);
+ dev_err(dev, "Indirect read completion error (%i)\n", ret);
goto failrd;
}

@@ -593,32 +572,32 @@ static int cqspi_indirect_read_execute(struct spi_nor *nor, u8 *rxbuf,
return ret;
}

-static int cqspi_write_setup(struct spi_nor *nor)
+static int cqspi_write_setup(struct cqspi_flash_pdata *f_pdata,
+ const struct spi_mem_op *op)
{
unsigned int reg;
- struct cqspi_flash_pdata *f_pdata = nor->priv;
struct cqspi_st *cqspi = f_pdata->cqspi;
void __iomem *reg_base = cqspi->iobase;

/* Set opcode. */
- reg = nor->program_opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB;
+ reg = op->cmd.opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB;
writel(reg, reg_base + CQSPI_REG_WR_INSTR);
- reg = cqspi_calc_rdreg(nor);
+ reg = cqspi_calc_rdreg(f_pdata);
writel(reg, reg_base + CQSPI_REG_RD_INSTR);

reg = readl(reg_base + CQSPI_REG_SIZE);
reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
- reg |= (nor->addr_width - 1);
+ reg |= (op->addr.nbytes - 1);
writel(reg, reg_base + CQSPI_REG_SIZE);
return 0;
}

-static int cqspi_indirect_write_execute(struct spi_nor *nor, loff_t to_addr,
- const u8 *txbuf, const size_t n_tx)
+static int cqspi_indirect_write_execute(struct cqspi_flash_pdata *f_pdata,
+ loff_t to_addr, const u8 *txbuf,
+ const size_t n_tx)
{
- const unsigned int page_size = nor->page_size;
- struct cqspi_flash_pdata *f_pdata = nor->priv;
struct cqspi_st *cqspi = f_pdata->cqspi;
+ struct device *dev = &cqspi->pdev->dev;
void __iomem *reg_base = cqspi->iobase;
unsigned int remaining = n_tx;
unsigned int write_bytes;
@@ -648,7 +627,7 @@ static int cqspi_indirect_write_execute(struct spi_nor *nor, loff_t to_addr,
while (remaining > 0) {
size_t write_words, mod_bytes;

- write_bytes = remaining > page_size ? page_size : remaining;
+ write_bytes = remaining;
write_words = write_bytes / 4;
mod_bytes = write_bytes % 4;
/* Write 4 bytes at a time then single bytes. */
@@ -665,8 +644,8 @@ static int cqspi_indirect_write_execute(struct spi_nor *nor, loff_t to_addr,
}

if (!wait_for_completion_timeout(&cqspi->transfer_complete,
- msecs_to_jiffies(CQSPI_TIMEOUT_MS))) {
- dev_err(nor->dev, "Indirect write timeout\n");
+ msecs_to_jiffies(CQSPI_TIMEOUT_MS))) {
+ dev_err(dev, "Indirect write timeout\n");
ret = -ETIMEDOUT;
goto failwr;
}
@@ -681,8 +660,7 @@ static int cqspi_indirect_write_execute(struct spi_nor *nor, loff_t to_addr,
ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_INDIRECTWR,
CQSPI_REG_INDIRECTWR_DONE_MASK, 0);
if (ret) {
- dev_err(nor->dev,
- "Indirect write completion error (%i)\n", ret);
+ dev_err(dev, "Indirect write completion error (%i)\n", ret);
goto failwr;
}

@@ -706,9 +684,8 @@ static int cqspi_indirect_write_execute(struct spi_nor *nor, loff_t to_addr,
return ret;
}

-static void cqspi_chipselect(struct spi_nor *nor)
+static void cqspi_chipselect(struct cqspi_flash_pdata *f_pdata)
{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
struct cqspi_st *cqspi = f_pdata->cqspi;
void __iomem *reg_base = cqspi->iobase;
unsigned int chip_select = f_pdata->cs;
@@ -736,32 +713,6 @@ static void cqspi_chipselect(struct spi_nor *nor)
writel(reg, reg_base + CQSPI_REG_CONFIG);
}

-static void cqspi_configure_cs_and_sizes(struct spi_nor *nor)
-{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
- struct cqspi_st *cqspi = f_pdata->cqspi;
- void __iomem *iobase = cqspi->iobase;
- unsigned int reg;
-
- /* configure page size and block size. */
- reg = readl(iobase + CQSPI_REG_SIZE);
- reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB);
- reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB);
- reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
- reg |= (nor->page_size << CQSPI_REG_SIZE_PAGE_LSB);
- reg |= (ilog2(nor->mtd.erasesize) << CQSPI_REG_SIZE_BLOCK_LSB);
- reg |= (nor->addr_width - 1);
- writel(reg, iobase + CQSPI_REG_SIZE);
-
- /* configure the chip select */
- cqspi_chipselect(nor);
-
- /* Store the new configuration of the controller */
- cqspi->current_page_size = nor->page_size;
- cqspi->current_erase_size = nor->mtd.erasesize;
- cqspi->current_addr_width = nor->addr_width;
-}
-
static unsigned int calculate_ticks_for_ns(const unsigned int ref_clk_hz,
const unsigned int ns_val)
{
@@ -773,9 +724,8 @@ static unsigned int calculate_ticks_for_ns(const unsigned int ref_clk_hz,
return ticks;
}

-static void cqspi_delay(struct spi_nor *nor)
+static void cqspi_delay(struct cqspi_flash_pdata *f_pdata)
{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
struct cqspi_st *cqspi = f_pdata->cqspi;
void __iomem *iobase = cqspi->iobase;
const unsigned int ref_clk_hz = cqspi->master_ref_clk_hz;
@@ -859,33 +809,27 @@ static void cqspi_controller_enable(struct cqspi_st *cqspi, bool enable)
writel(reg, reg_base + CQSPI_REG_CONFIG);
}

-static void cqspi_configure(struct spi_nor *nor)
+static void cqspi_configure(struct cqspi_flash_pdata *f_pdata,
+ unsigned long sclk)
{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
struct cqspi_st *cqspi = f_pdata->cqspi;
- const unsigned int sclk = f_pdata->clk_rate;
int switch_cs = (cqspi->current_cs != f_pdata->cs);
int switch_ck = (cqspi->sclk != sclk);

- if ((cqspi->current_page_size != nor->page_size) ||
- (cqspi->current_erase_size != nor->mtd.erasesize) ||
- (cqspi->current_addr_width != nor->addr_width))
- switch_cs = 1;
-
if (switch_cs || switch_ck)
cqspi_controller_enable(cqspi, 0);

/* Switch chip select. */
if (switch_cs) {
cqspi->current_cs = f_pdata->cs;
- cqspi_configure_cs_and_sizes(nor);
+ cqspi_chipselect(f_pdata);
}

/* Setup baudrate divisor and delays */
if (switch_ck) {
cqspi->sclk = sclk;
cqspi_config_baudrate_div(cqspi);
- cqspi_delay(nor);
+ cqspi_delay(f_pdata);
cqspi_readdata_capture(cqspi, !cqspi->rclk_en,
f_pdata->read_delay);
}
@@ -894,26 +838,25 @@ static void cqspi_configure(struct spi_nor *nor)
cqspi_controller_enable(cqspi, 1);
}

-static int cqspi_set_protocol(struct spi_nor *nor, const int read)
+static int cqspi_set_protocol(struct cqspi_flash_pdata *f_pdata,
+ const struct spi_mem_op *op)
{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
-
f_pdata->inst_width = CQSPI_INST_TYPE_SINGLE;
f_pdata->addr_width = CQSPI_INST_TYPE_SINGLE;
f_pdata->data_width = CQSPI_INST_TYPE_SINGLE;

- if (read) {
- switch (nor->read_proto) {
- case SNOR_PROTO_1_1_1:
+ if (op->data.dir == SPI_MEM_DATA_IN) {
+ switch (op->data.buswidth) {
+ case 1:
f_pdata->data_width = CQSPI_INST_TYPE_SINGLE;
break;
- case SNOR_PROTO_1_1_2:
+ case 2:
f_pdata->data_width = CQSPI_INST_TYPE_DUAL;
break;
- case SNOR_PROTO_1_1_4:
+ case 4:
f_pdata->data_width = CQSPI_INST_TYPE_QUAD;
break;
- case SNOR_PROTO_1_1_8:
+ case 8:
f_pdata->data_width = CQSPI_INST_TYPE_OCTAL;
break;
default:
@@ -921,36 +864,32 @@ static int cqspi_set_protocol(struct spi_nor *nor, const int read)
}
}

- cqspi_configure(nor);
-
return 0;
}

-static ssize_t cqspi_write(struct spi_nor *nor, loff_t to,
- size_t len, const u_char *buf)
+static ssize_t cqspi_write(struct cqspi_flash_pdata *f_pdata,
+ const struct spi_mem_op *op)
{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
struct cqspi_st *cqspi = f_pdata->cqspi;
+ loff_t to = op->addr.val;
+ size_t len = op->data.nbytes;
+ const u_char *buf = op->data.buf.out;
int ret;

- ret = cqspi_set_protocol(nor, 0);
+ ret = cqspi_set_protocol(f_pdata, op);
if (ret)
return ret;

- ret = cqspi_write_setup(nor);
+ ret = cqspi_write_setup(f_pdata, op);
if (ret)
return ret;

- if (f_pdata->use_direct_mode) {
+ if (cqspi->use_dac_mode && ((to + len) <= cqspi->ahb_size)) {
memcpy_toio(cqspi->ahb_base + to, buf, len);
- ret = cqspi_wait_idle(cqspi);
- } else {
- ret = cqspi_indirect_write_execute(nor, to, buf, len);
+ return cqspi_wait_idle(cqspi);
}
- if (ret)
- return ret;

- return len;
+ return cqspi_indirect_write_execute(f_pdata, to, buf, len);
}

static void cqspi_rx_dma_callback(void *param)
@@ -960,11 +899,11 @@ static void cqspi_rx_dma_callback(void *param)
complete(&cqspi->rx_dma_complete);
}

-static int cqspi_direct_read_execute(struct spi_nor *nor, u_char *buf,
- loff_t from, size_t len)
+static int cqspi_direct_read_execute(struct cqspi_flash_pdata *f_pdata,
+ u_char *buf, loff_t from, size_t len)
{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
struct cqspi_st *cqspi = f_pdata->cqspi;
+ struct device *dev = &cqspi->pdev->dev;
enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
dma_addr_t dma_src = (dma_addr_t)cqspi->mmap_phys_base + from;
int ret = 0;
@@ -977,15 +916,15 @@ static int cqspi_direct_read_execute(struct spi_nor *nor, u_char *buf,
return 0;
}

- dma_dst = dma_map_single(nor->dev, buf, len, DMA_FROM_DEVICE);
- if (dma_mapping_error(nor->dev, dma_dst)) {
- dev_err(nor->dev, "dma mapping failed\n");
+ dma_dst = dma_map_single(dev, buf, len, DMA_FROM_DEVICE);
+ if (dma_mapping_error(dev, dma_dst)) {
+ dev_err(dev, "dma mapping failed\n");
return -ENOMEM;
}
tx = dmaengine_prep_dma_memcpy(cqspi->rx_chan, dma_dst, dma_src,
len, flags);
if (!tx) {
- dev_err(nor->dev, "device_prep_dma_memcpy error\n");
+ dev_err(dev, "device_prep_dma_memcpy error\n");
ret = -EIO;
goto err_unmap;
}
@@ -997,7 +936,7 @@ static int cqspi_direct_read_execute(struct spi_nor *nor, u_char *buf,

ret = dma_submit_error(cookie);
if (ret) {
- dev_err(nor->dev, "dma_submit_error %d\n", cookie);
+ dev_err(dev, "dma_submit_error %d\n", cookie);
ret = -EIO;
goto err_unmap;
}
@@ -1006,99 +945,68 @@ static int cqspi_direct_read_execute(struct spi_nor *nor, u_char *buf,
if (!wait_for_completion_timeout(&cqspi->rx_dma_complete,
msecs_to_jiffies(len))) {
dmaengine_terminate_sync(cqspi->rx_chan);
- dev_err(nor->dev, "DMA wait_for_completion_timeout\n");
+ dev_err(dev, "DMA wait_for_completion_timeout\n");
ret = -ETIMEDOUT;
goto err_unmap;
}

err_unmap:
- dma_unmap_single(nor->dev, dma_dst, len, DMA_FROM_DEVICE);
+ dma_unmap_single(dev, dma_dst, len, DMA_FROM_DEVICE);

return ret;
}

-static ssize_t cqspi_read(struct spi_nor *nor, loff_t from,
- size_t len, u_char *buf)
-{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
- int ret;
-
- ret = cqspi_set_protocol(nor, 1);
- if (ret)
- return ret;
-
- ret = cqspi_read_setup(nor);
- if (ret)
- return ret;
-
- if (f_pdata->use_direct_mode)
- ret = cqspi_direct_read_execute(nor, buf, from, len);
- else
- ret = cqspi_indirect_read_execute(nor, buf, from, len);
- if (ret)
- return ret;
-
- return len;
-}
-
-static int cqspi_erase(struct spi_nor *nor, loff_t offs)
+static ssize_t cqspi_read(struct cqspi_flash_pdata *f_pdata,
+ const struct spi_mem_op *op)
{
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ loff_t from = op->addr.val;
+ size_t len = op->data.nbytes;
+ u_char *buf = op->data.buf.in;
int ret;

- ret = cqspi_set_protocol(nor, 0);
+ ret = cqspi_set_protocol(f_pdata, op);
if (ret)
return ret;

- /* Send write enable, then erase commands. */
- ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
+ ret = cqspi_read_setup(f_pdata, op);
if (ret)
return ret;

- /* Set up command buffer. */
- ret = cqspi_command_write_addr(nor, nor->erase_opcode, offs);
- if (ret)
- return ret;
+ if (cqspi->use_dac_mode && ((from + len) <= cqspi->ahb_size))
+ return cqspi_direct_read_execute(f_pdata, buf, from, len);

- return 0;
+ return cqspi_indirect_read_execute(f_pdata, buf, from, len);
}

-static int cqspi_prep(struct spi_nor *nor)
+static int cqspi_mem_process(struct spi_mem *mem, const struct spi_mem_op *op)
{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
- struct cqspi_st *cqspi = f_pdata->cqspi;
-
- mutex_lock(&cqspi->bus_mutex);
-
- return 0;
-}
+ struct cqspi_st *cqspi = spi_master_get_devdata(mem->spi->master);
+ struct cqspi_flash_pdata *f_pdata;

-static void cqspi_unprep(struct spi_nor *nor)
-{
- struct cqspi_flash_pdata *f_pdata = nor->priv;
- struct cqspi_st *cqspi = f_pdata->cqspi;
+ f_pdata = &cqspi->f_pdata[mem->spi->chip_select];
+ cqspi_configure(f_pdata, mem->spi->max_speed_hz);

- mutex_unlock(&cqspi->bus_mutex);
-}
+ if (op->data.dir == SPI_MEM_DATA_IN && op->data.buf.in) {
+ if (!op->addr.nbytes)
+ return cqspi_command_read(f_pdata, op);

-static int cqspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, size_t len)
-{
- int ret;
+ return cqspi_read(f_pdata, op);
+ }

- ret = cqspi_set_protocol(nor, 0);
- if (!ret)
- ret = cqspi_command_read(nor, opcode, buf, len);
+ if (!op->addr.nbytes || !op->data.buf.out)
+ return cqspi_command_write(f_pdata, op);

- return ret;
+ return cqspi_write(f_pdata, op);
}

-static int cqspi_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
- size_t len)
+static int cqspi_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
{
int ret;

- ret = cqspi_set_protocol(nor, 0);
- if (!ret)
- ret = cqspi_command_write(nor, opcode, buf, len);
+ ret = cqspi_mem_process(mem, op);
+ if (ret)
+ dev_err(&mem->spi->dev, "operation failed with %d\n", ret);

return ret;
}
@@ -1140,26 +1048,24 @@ static int cqspi_of_get_flash_pdata(struct platform_device *pdev,
return 0;
}

-static int cqspi_of_get_pdata(struct platform_device *pdev)
+static int cqspi_of_get_pdata(struct cqspi_st *cqspi)
{
- struct device_node *np = pdev->dev.of_node;
- struct cqspi_st *cqspi = platform_get_drvdata(pdev);
-
- cqspi->is_decoded_cs = of_property_read_bool(np, "cdns,is-decoded-cs");
+ struct device *dev = &cqspi->pdev->dev;
+ struct device_node *np = dev->of_node;

if (of_property_read_u32(np, "cdns,fifo-depth", &cqspi->fifo_depth)) {
- dev_err(&pdev->dev, "couldn't determine fifo-depth\n");
+ dev_err(dev, "couldn't determine fifo-depth\n");
return -ENXIO;
}

if (of_property_read_u32(np, "cdns,fifo-width", &cqspi->fifo_width)) {
- dev_err(&pdev->dev, "couldn't determine fifo-width\n");
+ dev_err(dev, "couldn't determine fifo-width\n");
return -ENXIO;
}

if (of_property_read_u32(np, "cdns,trigger-address",
&cqspi->trigger_address)) {
- dev_err(&pdev->dev, "couldn't determine trigger-address\n");
+ dev_err(dev, "couldn't determine trigger-address\n");
return -ENXIO;
}

@@ -1170,8 +1076,6 @@ static int cqspi_of_get_pdata(struct platform_device *pdev)

static void cqspi_controller_init(struct cqspi_st *cqspi)
{
- u32 reg;
-
cqspi_controller_enable(cqspi, 0);

/* Configure the remap address register, no remap */
@@ -1194,15 +1098,26 @@ static void cqspi_controller_init(struct cqspi_st *cqspi)
writel(cqspi->fifo_depth * cqspi->fifo_width / 8,
cqspi->iobase + CQSPI_REG_INDIRECTWRWATERMARK);

- /* Enable Direct Access Controller */
- reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);
- reg |= CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL;
- writel(reg, cqspi->iobase + CQSPI_REG_CONFIG);
+ /*
+ * Disable Direct Access Controller and Auto polling when not
+ * supported.
+ */
+ if (!cqspi->use_dac_mode) {
+ u32 reg;
+
+ reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);
+ reg &= ~CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL;
+ writel(reg, cqspi->iobase + CQSPI_REG_CONFIG);
+
+ reg = readl(cqspi->iobase + CQSPI_REG_WR_COMPLETION_CTRL);
+ reg |= CQSPI_REG_WR_DISABLE_AUTO_POLL;
+ writel(reg, cqspi->iobase + CQSPI_REG_WR_COMPLETION_CTRL);
+ }

cqspi_controller_enable(cqspi, 1);
}

-static void cqspi_request_mmap_dma(struct cqspi_st *cqspi)
+static int cqspi_request_mmap_dma(struct cqspi_st *cqspi)
{
dma_cap_mask_t mask;

@@ -1211,131 +1126,82 @@ static void cqspi_request_mmap_dma(struct cqspi_st *cqspi)

cqspi->rx_chan = dma_request_chan_by_mask(&mask);
if (IS_ERR(cqspi->rx_chan)) {
- dev_err(&cqspi->pdev->dev, "No Rx DMA available\n");
+ int ret = PTR_ERR(cqspi->rx_chan);
+
+ if (ret == -EPROBE_DEFER)
+ dev_err(&cqspi->pdev->dev, "No Rx DMA available\n");
cqspi->rx_chan = NULL;
+
+ return ret;
}
init_completion(&cqspi->rx_dma_complete);
+
+ return 0;
}

-static const struct spi_nor_controller_ops cqspi_controller_ops = {
- .prepare = cqspi_prep,
- .unprepare = cqspi_unprep,
- .read_reg = cqspi_read_reg,
- .write_reg = cqspi_write_reg,
- .read = cqspi_read,
- .write = cqspi_write,
- .erase = cqspi_erase,
+static const struct spi_controller_mem_ops cqspi_mem_ops = {
+ .exec_op = cqspi_exec_mem_op,
};

-static int cqspi_setup_flash(struct cqspi_st *cqspi, struct device_node *np)
+static int cqspi_setup_flash(struct cqspi_st *cqspi)
{
struct platform_device *pdev = cqspi->pdev;
struct device *dev = &pdev->dev;
- const struct cqspi_driver_platdata *ddata;
- struct spi_nor_hwcaps hwcaps;
+ struct device_node *np = dev->of_node;
struct cqspi_flash_pdata *f_pdata;
- struct spi_nor *nor;
- struct mtd_info *mtd;
unsigned int cs;
- int i, ret;
-
- ddata = of_device_get_match_data(dev);
- if (!ddata) {
- dev_err(dev, "Couldn't find driver data\n");
- return -EINVAL;
- }
- hwcaps.mask = ddata->hwcaps_mask;
+ int ret;

/* Get flash device data */
for_each_available_child_of_node(dev->of_node, np) {
ret = of_property_read_u32(np, "reg", &cs);
if (ret) {
dev_err(dev, "Couldn't determine chip select.\n");
- goto err;
+ return -EINVAL;
}

if (cs >= CQSPI_MAX_CHIPSELECT) {
- ret = -EINVAL;
dev_err(dev, "Chip select %d out of range.\n", cs);
- goto err;
+ return -EINVAL;
}

f_pdata = &cqspi->f_pdata[cs];
f_pdata->cqspi = cqspi;
f_pdata->cs = cs;

- ret = cqspi_of_get_flash_pdata(pdev, f_pdata, np);
- if (ret)
- goto err;
-
- nor = &f_pdata->nor;
- mtd = &nor->mtd;
-
- mtd->priv = nor;
-
- nor->dev = dev;
- spi_nor_set_flash_node(nor, np);
- nor->priv = f_pdata;
- nor->controller_ops = &cqspi_controller_ops;
-
- mtd->name = devm_kasprintf(dev, GFP_KERNEL, "%s.%d",
- dev_name(dev), cs);
- if (!mtd->name) {
- ret = -ENOMEM;
- goto err;
- }
-
- ret = spi_nor_scan(nor, NULL, &hwcaps);
- if (ret)
- goto err;
-
- ret = mtd_device_register(mtd, NULL, 0);
- if (ret)
- goto err;
-
- f_pdata->registered = true;
-
- if (mtd->size <= cqspi->ahb_size) {
- f_pdata->use_direct_mode = true;
- dev_dbg(nor->dev, "using direct mode for %s\n",
- mtd->name);
-
- if (!cqspi->rx_chan)
- cqspi_request_mmap_dma(cqspi);
- }
+ return cqspi_of_get_flash_pdata(pdev, f_pdata, np);
}

return 0;
-
-err:
- for (i = 0; i < CQSPI_MAX_CHIPSELECT; i++)
- if (cqspi->f_pdata[i].registered)
- mtd_device_unregister(&cqspi->f_pdata[i].nor.mtd);
- return ret;
}

static int cqspi_probe(struct platform_device *pdev)
{
- struct device_node *np = pdev->dev.of_node;
+ const struct cqspi_driver_platdata *ddata;
+ struct reset_control *rstc, *rstc_ocp;
struct device *dev = &pdev->dev;
+ struct spi_master *master;
+ struct resource *res_ahb;
struct cqspi_st *cqspi;
struct resource *res;
- struct resource *res_ahb;
- struct reset_control *rstc, *rstc_ocp;
- const struct cqspi_driver_platdata *ddata;
int ret;
int irq;

- cqspi = devm_kzalloc(dev, sizeof(*cqspi), GFP_KERNEL);
- if (!cqspi)
+ master = spi_alloc_master(&pdev->dev, sizeof(*cqspi));
+ if (!master) {
+ dev_err(&pdev->dev, "spi_alloc_master failed\n");
return -ENOMEM;
+ }
+ master->mode_bits = SPI_RX_QUAD | SPI_TX_DUAL | SPI_RX_DUAL;
+ master->mem_ops = &cqspi_mem_ops;
+ master->dev.of_node = pdev->dev.of_node;
+
+ cqspi = spi_master_get_devdata(master);

- mutex_init(&cqspi->bus_mutex);
cqspi->pdev = pdev;
- platform_set_drvdata(pdev, cqspi);

/* Obtain configuration from OF. */
- ret = cqspi_of_get_pdata(pdev);
+ ret = cqspi_of_get_pdata(cqspi);
if (ret) {
dev_err(dev, "Cannot get mandatory OF data.\n");
return -ENODEV;
@@ -1390,13 +1256,13 @@ static int cqspi_probe(struct platform_device *pdev)
rstc = devm_reset_control_get_optional_exclusive(dev, "qspi");
if (IS_ERR(rstc)) {
dev_err(dev, "Cannot get QSPI reset.\n");
- return PTR_ERR(rstc);
+ goto probe_reset_failed;
}

rstc_ocp = devm_reset_control_get_optional_exclusive(dev, "qspi-ocp");
if (IS_ERR(rstc_ocp)) {
dev_err(dev, "Cannot get QSPI OCP reset.\n");
- return PTR_ERR(rstc_ocp);
+ goto probe_reset_failed;
}

reset_control_assert(rstc);
@@ -1407,15 +1273,21 @@ static int cqspi_probe(struct platform_device *pdev)

cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk);
ddata = of_device_get_match_data(dev);
- if (ddata && (ddata->quirks & CQSPI_NEEDS_WR_DELAY))
- cqspi->wr_delay = 5 * DIV_ROUND_UP(NSEC_PER_SEC,
- cqspi->master_ref_clk_hz);
+ if (ddata) {
+ if (ddata->quirks & CQSPI_NEEDS_WR_DELAY)
+ cqspi->wr_delay = 5 * DIV_ROUND_UP(NSEC_PER_SEC,
+ cqspi->master_ref_clk_hz);
+ if (ddata->hwcaps_mask & CQSPI_SUPPORTS_OCTAL)
+ master->mode_bits |= SPI_RX_OCTAL;
+ if (!(ddata->quirks & CQSPI_DISABLE_DAC_MODE))
+ cqspi->use_dac_mode = true;
+ }

ret = devm_request_irq(dev, irq, cqspi_irq_handler, 0,
pdev->name, cqspi);
if (ret) {
dev_err(dev, "Cannot request IRQ.\n");
- goto probe_irq_failed;
+ goto probe_reset_failed;
}

cqspi_wait_idle(cqspi);
@@ -1423,16 +1295,28 @@ static int cqspi_probe(struct platform_device *pdev)
cqspi->current_cs = -1;
cqspi->sclk = 0;

- ret = cqspi_setup_flash(cqspi, np);
+ ret = cqspi_setup_flash(cqspi);
if (ret) {
- dev_err(dev, "Cadence QSPI NOR probe failed %d\n", ret);
+ dev_err(dev, "failed to setup flash parameters %d\n", ret);
goto probe_setup_failed;
}

- return ret;
+ if (cqspi->use_dac_mode) {
+ ret = cqspi_request_mmap_dma(cqspi);
+ if (ret == -EPROBE_DEFER)
+ goto probe_setup_failed;
+ }
+
+ ret = devm_spi_register_master(dev, master);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register SPI ctlr %d\n", ret);
+ goto probe_setup_failed;
+ }
+
+ return 0;
probe_setup_failed:
cqspi_controller_enable(cqspi, 0);
-probe_irq_failed:
+probe_reset_failed:
clk_disable_unprepare(cqspi->clk);
probe_clk_failed:
pm_runtime_put_sync(dev);
@@ -1443,11 +1327,6 @@ static int cqspi_probe(struct platform_device *pdev)
static int cqspi_remove(struct platform_device *pdev)
{
struct cqspi_st *cqspi = platform_get_drvdata(pdev);
- int i;
-
- for (i = 0; i < CQSPI_MAX_CHIPSELECT; i++)
- if (cqspi->f_pdata[i].registered)
- mtd_device_unregister(&cqspi->f_pdata[i].nor.mtd);

cqspi_controller_enable(cqspi, 0);

@@ -1490,16 +1369,15 @@ static const struct dev_pm_ops cqspi__dev_pm_ops = {
#endif

static const struct cqspi_driver_platdata cdns_qspi = {
- .hwcaps_mask = CQSPI_BASE_HWCAPS_MASK,
+ .quirks = CQSPI_DISABLE_DAC_MODE,
};

static const struct cqspi_driver_platdata k2g_qspi = {
- .hwcaps_mask = CQSPI_BASE_HWCAPS_MASK,
.quirks = CQSPI_NEEDS_WR_DELAY,
};

static const struct cqspi_driver_platdata am654_ospi = {
- .hwcaps_mask = CQSPI_BASE_HWCAPS_MASK | SNOR_HWCAPS_READ_1_1_8,
+ .hwcaps_mask = CQSPI_SUPPORTS_OCTAL,
.quirks = CQSPI_NEEDS_WR_DELAY,
};

@@ -1538,3 +1416,5 @@ MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" CQSPI_NAME);
MODULE_AUTHOR("Ley Foon Tan <lftan@altera.com>");
MODULE_AUTHOR("Graham Moore <grmoore@opensource.altera.com>");
+MODULE_AUTHOR("Vadivel Murugan R <vadivel.muruganx.ramuthevar@intel.com>");
+MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>");
--
2.11.0
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  Last update: 2020-03-10 02:53    [W:0.124 / U:1.468 seconds]
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