Add support for Direct Access Controller mode of Cadence QSPI. This
allows MMIO access to SPI NOR flash providing better read performance.
Signed-off-by: Vignesh R <vigne...@ti.com>
Signed-off-by: Vignesh Raghavendra <vigne...@ti.com>
---
drivers/spi/cadence_qspi.c | 40 ++++++++++++----------
drivers/spi/cadence_qspi.h | 19 ++++++-----
drivers/spi/cadence_qspi_apb.c | 61 +++++++++++++++++++++++++++++-----
3 files changed, 87 insertions(+), 33 deletions(-)
diff --git a/drivers/spi/cadence_qspi.c b/drivers/spi/cadence_qspi.c
index 673a2e9a6c4c..6c98cbf39ae4 100644
--- a/drivers/spi/cadence_qspi.c
+++ b/drivers/spi/cadence_qspi.c
@@ -12,12 +12,13 @@
#include <spi.h>
#include <spi-mem.h>
#include <linux/errno.h>
+#include <linux/sizes.h>
#include "cadence_qspi.h"
#define CQSPI_STIG_READ 0
#define CQSPI_STIG_WRITE 1
-#define CQSPI_INDIRECT_READ 2
-#define CQSPI_INDIRECT_WRITE 3
+#define CQSPI_READ 2
+#define CQSPI_WRITE 3
static int cadence_spi_write_speed(struct udevice *bus, uint hz)
{
@@ -189,6 +190,7 @@ static int cadence_spi_remove(struct udevice *dev)
static int cadence_spi_set_mode(struct udevice *bus, uint mode)
{
+ struct cadence_spi_platdata *plat = bus->platdata;
struct cadence_spi_priv *priv = dev_get_priv(bus);
/* Disable QSPI */
@@ -197,6 +199,10 @@ static int cadence_spi_set_mode(struct udevice *bus, uint
mode)
/* Set SPI mode */
cadence_qspi_apb_set_clk_mode(priv->regbase, mode);
+ /* Enable Direct Access Controller */
+ if (plat->use_dac_mode)
+ cadence_qspi_apb_dac_mode_enable(priv->regbase);
+
/* Enable QSPI */
cadence_qspi_apb_controller_enable(priv->regbase);
@@ -221,12 +227,12 @@ static int cadence_spi_mem_exec_op(struct spi_slave *spi,
if (!op->addr.nbytes)
mode = CQSPI_STIG_READ;
else
- mode = CQSPI_INDIRECT_READ;
+ mode = CQSPI_READ;
} else {
if (!op->addr.nbytes || !op->data.buf.out)
mode = CQSPI_STIG_WRITE;
else
- mode = CQSPI_INDIRECT_WRITE;
+ mode = CQSPI_WRITE;
}
switch (mode) {
@@ -236,19 +242,15 @@ static int cadence_spi_mem_exec_op(struct spi_slave *spi,
case CQSPI_STIG_WRITE:
err = cadence_qspi_apb_command_write(base, op);
break;
- case CQSPI_INDIRECT_READ:
- err = cadence_qspi_apb_indirect_read_setup(plat, op);
- if (!err) {
- err = cadence_qspi_apb_indirect_read_execute
- (plat, op->data.nbytes, op->data.buf.in);
- }
+ case CQSPI_READ:
+ err = cadence_qspi_apb_read_setup(plat, op);
+ if (!err)
+ err = cadence_qspi_apb_read_execute(plat, op);
break;
- case CQSPI_INDIRECT_WRITE:
- err = cadence_qspi_apb_indirect_write_setup(plat, op);
- if (!err) {
- err = cadence_qspi_apb_indirect_write_execute
- (plat, op->data.nbytes, op->data.buf.out);
- }
+ case CQSPI_WRITE:
+ err = cadence_qspi_apb_write_setup(plat, op);
+ if (!err)
+ err = cadence_qspi_apb_write_execute(plat, op);
break;
default:
err = -1;
@@ -264,13 +266,17 @@ static int cadence_spi_ofdata_to_platdata(struct udevice
*bus)
ofnode subnode;
plat->regbase = (void *)devfdt_get_addr_index(bus, 0);
- plat->ahbbase = (void *)devfdt_get_addr_index(bus, 1);
+ plat->ahbbase = (void *)devfdt_get_addr_size_index(bus, 1,
+ &plat->ahbsize);
plat->is_decoded_cs = dev_read_bool(bus, "cdns,is-decoded-cs");
plat->fifo_depth = dev_read_u32_default(bus, "cdns,fifo-depth", 128);
plat->fifo_width = dev_read_u32_default(bus, "cdns,fifo-width", 4);
plat->trigger_address = dev_read_u32_default(bus,
"cdns,trigger-address",
0);
+ /* Use DAC mode only when MMIO window is at least 8M wide */
+ if (plat->ahbsize >= SZ_8M)
+ plat->use_dac_mode = true;
/* All other paramters are embedded in the child node */
subnode = dev_read_first_subnode(bus);
diff --git a/drivers/spi/cadence_qspi.h b/drivers/spi/cadence_qspi.h
index e655b027d788..619f0bed8efd 100644
--- a/drivers/spi/cadence_qspi.h
+++ b/drivers/spi/cadence_qspi.h
@@ -23,6 +23,8 @@ struct cadence_spi_platdata {
u32 fifo_depth;
u32 fifo_width;
u32 trigger_address;
+ fdt_addr_t ahbsize;
+ bool use_dac_mode;
/* Flash parameters */
u32 page_size;
@@ -52,20 +54,21 @@ struct cadence_spi_priv {
void cadence_qspi_apb_controller_init(struct cadence_spi_platdata *plat);
void cadence_qspi_apb_controller_enable(void *reg_base_addr);
void cadence_qspi_apb_controller_disable(void *reg_base_addr);
+void cadence_qspi_apb_dac_mode_enable(void *reg_base);
int cadence_qspi_apb_command_read(void *reg_base_addr,
const struct spi_mem_op *op);
int cadence_qspi_apb_command_write(void *reg_base_addr,
const struct spi_mem_op *op);
-int cadence_qspi_apb_indirect_read_setup(struct cadence_spi_platdata *plat,
- const struct spi_mem_op *op);
-int cadence_qspi_apb_indirect_read_execute(struct cadence_spi_platdata *plat,
- unsigned int rxlen, u8 *rxbuf);
-int cadence_qspi_apb_indirect_write_setup(struct cadence_spi_platdata *plat,
- const struct spi_mem_op *op);
-int cadence_qspi_apb_indirect_write_execute(struct cadence_spi_platdata *plat,
- unsigned int txlen, const u8 *txbuf);
+int cadence_qspi_apb_read_setup(struct cadence_spi_platdata *plat,
+ const struct spi_mem_op *op);
+int cadence_qspi_apb_read_execute(struct cadence_spi_platdata *plat,
+ const struct spi_mem_op *op);
+int cadence_qspi_apb_write_setup(struct cadence_spi_platdata *plat,
+ const struct spi_mem_op *op);
+int cadence_qspi_apb_write_execute(struct cadence_spi_platdata *plat,
+ const struct spi_mem_op *op);
void cadence_qspi_apb_chipselect(void *reg_base,
unsigned int chip_select, unsigned int decoder_enable);
diff --git a/drivers/spi/cadence_qspi_apb.c b/drivers/spi/cadence_qspi_apb.c
index 8dd0495dfcf4..fd491f2c8104 100644
--- a/drivers/spi/cadence_qspi_apb.c
+++ b/drivers/spi/cadence_qspi_apb.c
@@ -189,6 +189,15 @@ void cadence_qspi_apb_controller_disable(void *reg_base)
writel(reg, reg_base + CQSPI_REG_CONFIG);
}
+void cadence_qspi_apb_dac_mode_enable(void *reg_base)
+{
+ unsigned int reg;
+
+ reg = readl(reg_base + CQSPI_REG_CONFIG);
+ reg |= CQSPI_REG_CONFIG_DIRECT;
+ writel(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
/* Return 1 if idle, otherwise return 0 (busy). */
static unsigned int cadence_qspi_wait_idle(void *reg_base)
{
@@ -512,8 +521,8 @@ int cadence_qspi_apb_command_write(void *reg_base, const
struct spi_mem_op *op)
}
/* Opcode + Address (3/4 bytes) + dummy bytes (0-4 bytes) */
-int cadence_qspi_apb_indirect_read_setup(struct cadence_spi_platdata *plat,
- const struct spi_mem_op *op)
+int cadence_qspi_apb_read_setup(struct cadence_spi_platdata *plat,
+ const struct spi_mem_op *op)
{
unsigned int reg;
unsigned int rd_reg;
@@ -577,8 +586,9 @@ static int cadence_qspi_wait_for_data(struct
cadence_spi_platdata *plat)
return -ETIMEDOUT;
}
-int cadence_qspi_apb_indirect_read_execute(struct cadence_spi_platdata *plat,
- unsigned int n_rx, u8 *rxbuf)
+static int
+cadence_qspi_apb_indirect_read_execute(struct cadence_spi_platdata *plat,
+ unsigned int n_rx, u8 *rxbuf)
{
unsigned int remaining = n_rx;
unsigned int bytes_to_read = 0;
@@ -639,9 +649,26 @@ failrd:
return ret;
}
+int cadence_qspi_apb_read_execute(struct cadence_spi_platdata *plat,
+ const struct spi_mem_op *op)
+{
+ u32 from = op->addr.val;
+ void *buf = op->data.buf.in;
+ size_t len = op->data.nbytes;
+
+ if (plat->use_dac_mode && (from + len < plat->ahbsize)) {
+ memcpy_fromio(buf, plat->ahbbase + from, len);
+ if (!cadence_qspi_wait_idle(plat->regbase))
+ return -EIO;
+ return 0;
+ }
+
+ return cadence_qspi_apb_indirect_read_execute(plat, len, buf);
+}
+
/* Opcode + Address (3/4 bytes) */
-int cadence_qspi_apb_indirect_write_setup(struct cadence_spi_platdata *plat,
- const struct spi_mem_op *op)
+int cadence_qspi_apb_write_setup(struct cadence_spi_platdata *plat,
+ const struct spi_mem_op *op)
{
unsigned int reg;
@@ -662,8 +689,9 @@ int cadence_qspi_apb_indirect_write_setup(struct
cadence_spi_platdata *plat,
return 0;
}
-int cadence_qspi_apb_indirect_write_execute(struct cadence_spi_platdata *plat,
- unsigned int n_tx, const u8 *txbuf)
+static int
+cadence_qspi_apb_indirect_write_execute(struct cadence_spi_platdata *plat,
+ unsigned int n_tx, const u8 *txbuf)
{
unsigned int page_size = plat->page_size;
unsigned int remaining = n_tx;
@@ -735,6 +763,23 @@ failwr:
return ret;
}
+int cadence_qspi_apb_write_execute(struct cadence_spi_platdata *plat,
+ const struct spi_mem_op *op)
+{
+ u32 to = op->addr.val;
+ const void *buf = op->data.buf.out;
+ size_t len = op->data.nbytes;
+
+ if (plat->use_dac_mode && (to + len < plat->ahbsize)) {
+ memcpy_toio(plat->ahbbase + to, buf, len);
+ if (!cadence_qspi_wait_idle(plat->regbase))
+ return -EIO;
+ return 0;
+ }
+
+ return cadence_qspi_apb_indirect_write_execute(plat, len, buf);
+}
+
void cadence_qspi_apb_enter_xip(void *reg_base, char xip_dummy)
{
unsigned int reg;
--
2.23.0
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