michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: flash: stm32: qspi: support 1-4-4 and 1-1-4 quad read modes

Browse source 
Adds support for 1-4-4 and 1-1-4 read modes.

SFDP is used to query for available read instructions, then the
fastest one is used.

Signed-off-by: Georgij Cernysiov <geo.cgv@gmail.com>
This commit is contained in:
Georgij Cernysiov 2022-05-06 14:03:01 +02:00 • committed by Marti Bolivar
commit bbdfe6d9e0
1 changed files with 58 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

80
drivers/flash/flash_stm32_qspi.c
View file

@ -43,6 +43,8 @@ LOG_MODULE_REGISTER(flash_stm32_qspi, CONFIG_FLASH_LOG_LEVEL);
#define STM32_QSPI_FIFO_THRESHOLD 8
#define STM32_QSPI_CLOCK_PRESCALER_MAX 255
#define STM32_QSPI_UNKNOWN_MODE (0xFF)
#define STM32_QSPI_USE_DMA DT_NODE_HAS_PROP(DT_INST_PARENT(0), dmas)
#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32_qspi_nor)
@ -90,6 +92,7 @@ struct flash_stm32_qspi_data {
struct jesd216_erase_type erase_types[JESD216_NUM_ERASE_TYPES];
/* Number of bytes per page */
uint16_t page_size;
enum jesd216_mode_type mode;
int cmd_status;
struct stream dma;
uint8_t qspi_write_cmd;
@ -133,17 +136,29 @@ static inline void qspi_set_address_size(const struct device *dev,
cmd->AddressSize = QSPI_ADDRESS_24_BITS;
}
static inline void qspi_prepare_quad_read(const struct device *dev,
static inline int qspi_prepare_quad_read(const struct device *dev,
QSPI_CommandTypeDef *cmd)
{
struct flash_stm32_qspi_data *dev_data = dev->data;
if (IS_ENABLED(STM32_QSPI_USE_QUAD_IO) && dev_data->flag_quad_io_en) {
switch (dev_data->mode) {
case JESD216_MODE_114:
cmd->AddressMode = QSPI_ADDRESS_1_LINE;
break;
case JESD216_MODE_144:
cmd->AddressMode = QSPI_ADDRESS_4_LINES;
break;
default:
return -ENOTSUP;
}
cmd->Instruction = dev_data->qspi_read_cmd;
cmd->AddressMode = QSPI_ADDRESS_4_LINES;
cmd->DataMode = QSPI_DATA_4_LINES;
cmd->DummyCycles = dev_data->qspi_read_cmd_latency;
}
return 0;
}
static inline int qspi_prepare_quad_program(const struct device *dev,
@ -329,7 +344,10 @@ static int flash_stm32_qspi_read(const struct device *dev, off_t addr,
};
qspi_set_address_size(dev, &cmd);
qspi_prepare_quad_read(dev, &cmd);
ret = qspi_prepare_quad_read(dev, &cmd);
if (ret < 0) {
return ret;
}
qspi_lock_thread(dev);
ret = qspi_read_access(dev, &cmd, data, size);
@ -884,34 +902,52 @@ static int spi_nor_process_bfp(const struct device *dev,
}
}
}
/*
* Only check if the 1-4-4 (i.e. 4READ) fast read operation is
* supported - other modes - e.g. 1-1-4 (QREAD) or 1-1-2 (DREAD) are
* not.
* Only check if the 1-4-4 (i.e. 4READ) or 1-1-4 (QREAD)
* is supported - other modes are not.
*/
if (IS_ENABLED(STM32_QSPI_USE_QUAD_IO)) {
const enum jesd216_mode_type supported_modes[] = { JESD216_MODE_114,
JESD216_MODE_144 };
struct jesd216_bfp_dw15 dw15;
struct jesd216_instr res;
rc = jesd216_bfp_read_support(php, bfp, JESD216_MODE_144, &res);
if (rc > 0) {
/* Program flash memory to use SIO[0123] */
rc = qspi_program_quad_io(dev);
if (rc) {
LOG_ERR("Unable to enable QUAD IO mode: %d\n",
rc);
return rc;
}
/* reset active mode */
data->mode = STM32_QSPI_UNKNOWN_MODE;
LOG_INF("Mode: 1-4-4 with instr:[0x%x] supported!",
res.instr);
/* query supported read modes, begin from the slowest */
for (size_t i = 0; i < ARRAY_SIZE(supported_modes); ++i) {
rc = jesd216_bfp_read_support(php, bfp, supported_modes[i], &res);
if (rc >= 0) {
LOG_INF("Quad read mode %d instr [0x%x] supported",
supported_modes[i], res.instr);
data->qspi_read_cmd = res.instr;
data->qspi_read_cmd_latency = res.wait_states;
if (res.mode_clocks) {
data->qspi_read_cmd_latency +=
res.mode_clocks;
data->mode = supported_modes[i];
data->qspi_read_cmd = res.instr;
data->qspi_read_cmd_latency = res.wait_states;
if (res.mode_clocks) {
data->qspi_read_cmd_latency += res.mode_clocks;
}
}
}
/* don't continue when there is no supported mode */
if (data->mode == STM32_QSPI_UNKNOWN_MODE) {
LOG_ERR("No supported flash read mode found");
return -ENOTSUP;
}
LOG_INF("Quad read mode %d instr [0x%x] will be used", data->mode, res.instr);
/* enable QE */
rc = qspi_program_quad_io(dev);
if (rc < 0) {
LOG_ERR("Failed to enable Quad mode: %d", rc);
return rc;
}
}
return 0;