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mtd: spi-nor: cadence-quadspi: Add support for direct access mode

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Cadence QSPI controller provides direct access mode through which flash
can be accessed in a memory-mapped IO mode. This enables read/write to
flash using memcpy*() functions. This mode provides higher throughput
for both read/write operations when compared to current indirect mode of
operation.

This patch therefore adds support to use QSPI in direct mode. If the
window reserved in SoC's memory map for MMIO access is less that of
flash size(like on most SoCFPGA variants), then the driver falls back
to indirect mode of operation.

On TI's 66AK2G SoC, with ARM running at 600MHz and QSPI at 96MHz
switching to direct mode improves read throughput from 3MB/s to 8MB/s.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>
This commit is contained in:
Vignesh R 2017-12-29 14:41:03 +05:30 committed by Cyrille Pitchen
parent e4b580bc04
commit a27f2eaf2b
1 changed files with 29 additions and 2 deletions
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31
drivers/mtd/spi-nor/cadence-quadspi.c
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@ -58,6 +58,7 @@ struct cqspi_flash_pdata {
u8 data_width;
u8 cs;
bool registered;
bool use_direct_mode;
};
struct cqspi_st {
@ -68,6 +69,7 @@ struct cqspi_st {
void __iomem *iobase;
void __iomem *ahb_base;
resource_size_t ahb_size;
struct completion transfer_complete;
struct mutex bus_mutex;
@ -103,6 +105,7 @@ struct cqspi_st {
/* Register map */
#define CQSPI_REG_CONFIG 0x00
#define CQSPI_REG_CONFIG_ENABLE_MASK BIT(0)
#define CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL BIT(7)
#define CQSPI_REG_CONFIG_DECODE_MASK BIT(9)
#define CQSPI_REG_CONFIG_CHIPSELECT_LSB 10
#define CQSPI_REG_CONFIG_DMA_MASK BIT(15)
@ -890,6 +893,8 @@ static int cqspi_set_protocol(struct spi_nor *nor, const int read)
static ssize_t cqspi_write(struct spi_nor *nor, loff_t to,
size_t len, const u_char *buf)
{
struct cqspi_flash_pdata *f_pdata = nor->priv;
struct cqspi_st *cqspi = f_pdata->cqspi;
int ret;
ret = cqspi_set_protocol(nor, 0);
@ -900,7 +905,10 @@ static ssize_t cqspi_write(struct spi_nor *nor, loff_t to,
if (ret)
return ret;
ret = cqspi_indirect_write_execute(nor, to, buf, len);
if (f_pdata->use_direct_mode)
memcpy_toio(cqspi->ahb_base + to, buf, len);
else
ret = cqspi_indirect_write_execute(nor, to, buf, len);
if (ret)
return ret;
@ -910,6 +918,8 @@ static ssize_t cqspi_write(struct spi_nor *nor, loff_t to,
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;
struct cqspi_st *cqspi = f_pdata->cqspi;
int ret;
ret = cqspi_set_protocol(nor, 1);
@ -920,7 +930,10 @@ static ssize_t cqspi_read(struct spi_nor *nor, loff_t from,
if (ret)
return ret;
ret = cqspi_indirect_read_execute(nor, buf, from, len);
if (f_pdata->use_direct_mode)
memcpy_fromio(buf, cqspi->ahb_base + from, len);
else
ret = cqspi_indirect_read_execute(nor, buf, from, len);
if (ret)
return ret;
@ -1055,6 +1068,8 @@ 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 */
@ -1077,6 +1092,11 @@ 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);
cqspi_controller_enable(cqspi, 1);
}
@ -1152,6 +1172,12 @@ static int cqspi_setup_flash(struct cqspi_st *cqspi, struct device_node *np)
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);
}
}
return 0;
@ -1211,6 +1237,7 @@ static int cqspi_probe(struct platform_device *pdev)
dev_err(dev, "Cannot remap AHB address.\n");
return PTR_ERR(cqspi->ahb_base);
}
cqspi->ahb_size = resource_size(res_ahb);
init_completion(&cqspi->transfer_complete);