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Diffstat (limited to '')
| -rw-r--r-- | drivers/st/spi/stm32_qspi.c | 508 |
1 files changed, 508 insertions, 0 deletions
diff --git a/drivers/st/spi/stm32_qspi.c b/drivers/st/spi/stm32_qspi.c new file mode 100644 index 0000000..73aa9ac --- /dev/null +++ b/drivers/st/spi/stm32_qspi.c @@ -0,0 +1,508 @@ +/* + * Copyright (c) 2019-2022, STMicroelectronics - All Rights Reserved + * + * SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause + */ + +#include <inttypes.h> + +#include <common/debug.h> +#include <common/fdt_wrappers.h> +#include <drivers/clk.h> +#include <drivers/delay_timer.h> +#include <drivers/spi_mem.h> +#include <drivers/st/stm32_gpio.h> +#include <drivers/st/stm32_qspi.h> +#include <drivers/st/stm32mp_reset.h> +#include <lib/mmio.h> +#include <lib/utils_def.h> +#include <libfdt.h> + +#include <platform_def.h> + +/* Timeout for device interface reset */ +#define TIMEOUT_US_1_MS 1000U + +/* QUADSPI registers */ +#define QSPI_CR 0x00U +#define QSPI_DCR 0x04U +#define QSPI_SR 0x08U +#define QSPI_FCR 0x0CU +#define QSPI_DLR 0x10U +#define QSPI_CCR 0x14U +#define QSPI_AR 0x18U +#define QSPI_ABR 0x1CU +#define QSPI_DR 0x20U +#define QSPI_PSMKR 0x24U +#define QSPI_PSMAR 0x28U +#define QSPI_PIR 0x2CU +#define QSPI_LPTR 0x30U + +/* QUADSPI control register */ +#define QSPI_CR_EN BIT(0) +#define QSPI_CR_ABORT BIT(1) +#define QSPI_CR_DMAEN BIT(2) +#define QSPI_CR_TCEN BIT(3) +#define QSPI_CR_SSHIFT BIT(4) +#define QSPI_CR_DFM BIT(6) +#define QSPI_CR_FSEL BIT(7) +#define QSPI_CR_FTHRES_SHIFT 8U +#define QSPI_CR_TEIE BIT(16) +#define QSPI_CR_TCIE BIT(17) +#define QSPI_CR_FTIE BIT(18) +#define QSPI_CR_SMIE BIT(19) +#define QSPI_CR_TOIE BIT(20) +#define QSPI_CR_APMS BIT(22) +#define QSPI_CR_PMM BIT(23) +#define QSPI_CR_PRESCALER_MASK GENMASK_32(31, 24) +#define QSPI_CR_PRESCALER_SHIFT 24U + +/* QUADSPI device configuration register */ +#define QSPI_DCR_CKMODE BIT(0) +#define QSPI_DCR_CSHT_MASK GENMASK_32(10, 8) +#define QSPI_DCR_CSHT_SHIFT 8U +#define QSPI_DCR_FSIZE_MASK GENMASK_32(20, 16) +#define QSPI_DCR_FSIZE_SHIFT 16U + +/* QUADSPI status register */ +#define QSPI_SR_TEF BIT(0) +#define QSPI_SR_TCF BIT(1) +#define QSPI_SR_FTF BIT(2) +#define QSPI_SR_SMF BIT(3) +#define QSPI_SR_TOF BIT(4) +#define QSPI_SR_BUSY BIT(5) + +/* QUADSPI flag clear register */ +#define QSPI_FCR_CTEF BIT(0) +#define QSPI_FCR_CTCF BIT(1) +#define QSPI_FCR_CSMF BIT(3) +#define QSPI_FCR_CTOF BIT(4) + +/* QUADSPI communication configuration register */ +#define QSPI_CCR_DDRM BIT(31) +#define QSPI_CCR_DHHC BIT(30) +#define QSPI_CCR_SIOO BIT(28) +#define QSPI_CCR_FMODE_SHIFT 26U +#define QSPI_CCR_DMODE_SHIFT 24U +#define QSPI_CCR_DCYC_SHIFT 18U +#define QSPI_CCR_ABSIZE_SHIFT 16U +#define QSPI_CCR_ABMODE_SHIFT 14U +#define QSPI_CCR_ADSIZE_SHIFT 12U +#define QSPI_CCR_ADMODE_SHIFT 10U +#define QSPI_CCR_IMODE_SHIFT 8U +#define QSPI_CCR_IND_WRITE 0U +#define QSPI_CCR_IND_READ 1U +#define QSPI_CCR_MEM_MAP 3U + +#define QSPI_MAX_CHIP 2U + +#define QSPI_FIFO_TIMEOUT_US 30U +#define QSPI_CMD_TIMEOUT_US 1000U +#define QSPI_BUSY_TIMEOUT_US 100U +#define QSPI_ABT_TIMEOUT_US 100U + +#define DT_QSPI_COMPAT "st,stm32f469-qspi" + +#define FREQ_100MHZ 100000000U + +struct stm32_qspi_ctrl { + uintptr_t reg_base; + uintptr_t mm_base; + size_t mm_size; + unsigned long clock_id; + unsigned int reset_id; +}; + +static struct stm32_qspi_ctrl stm32_qspi; + +static uintptr_t qspi_base(void) +{ + return stm32_qspi.reg_base; +} + +static int stm32_qspi_wait_for_not_busy(void) +{ + uint64_t timeout = timeout_init_us(QSPI_BUSY_TIMEOUT_US); + + while ((mmio_read_32(qspi_base() + QSPI_SR) & QSPI_SR_BUSY) != 0U) { + if (timeout_elapsed(timeout)) { + ERROR("%s: busy timeout\n", __func__); + return -ETIMEDOUT; + } + } + + return 0; +} + +static int stm32_qspi_wait_cmd(const struct spi_mem_op *op) +{ + int ret = 0; + uint64_t timeout; + + timeout = timeout_init_us(QSPI_CMD_TIMEOUT_US); + while ((mmio_read_32(qspi_base() + QSPI_SR) & QSPI_SR_TCF) == 0U) { + if (timeout_elapsed(timeout)) { + ret = -ETIMEDOUT; + break; + } + } + + if (ret == 0) { + if ((mmio_read_32(qspi_base() + QSPI_SR) & QSPI_SR_TEF) != 0U) { + ERROR("%s: transfer error\n", __func__); + ret = -EIO; + } + } else { + ERROR("%s: cmd timeout\n", __func__); + } + + /* Clear flags */ + mmio_write_32(qspi_base() + QSPI_FCR, QSPI_FCR_CTCF | QSPI_FCR_CTEF); + + if (ret == 0) { + ret = stm32_qspi_wait_for_not_busy(); + } + + return ret; +} + +static void stm32_qspi_read_fifo(uint8_t *val, uintptr_t addr) +{ + *val = mmio_read_8(addr); +} + +static void stm32_qspi_write_fifo(uint8_t *val, uintptr_t addr) +{ + mmio_write_8(addr, *val); +} + +static int stm32_qspi_poll(const struct spi_mem_op *op) +{ + void (*fifo)(uint8_t *val, uintptr_t addr); + uint32_t len; + uint8_t *buf; + + if (op->data.dir == SPI_MEM_DATA_IN) { + fifo = stm32_qspi_read_fifo; + } else { + fifo = stm32_qspi_write_fifo; + } + + buf = (uint8_t *)op->data.buf; + + for (len = op->data.nbytes; len != 0U; len--) { + uint64_t timeout = timeout_init_us(QSPI_FIFO_TIMEOUT_US); + + while ((mmio_read_32(qspi_base() + QSPI_SR) & + QSPI_SR_FTF) == 0U) { + if (timeout_elapsed(timeout)) { + ERROR("%s: fifo timeout\n", __func__); + return -ETIMEDOUT; + } + } + + fifo(buf++, qspi_base() + QSPI_DR); + } + + return 0; +} + +static int stm32_qspi_mm(const struct spi_mem_op *op) +{ + memcpy(op->data.buf, + (void *)(stm32_qspi.mm_base + (size_t)op->addr.val), + op->data.nbytes); + + return 0; +} + +static int stm32_qspi_tx(const struct spi_mem_op *op, uint8_t mode) +{ + if (op->data.nbytes == 0U) { + return 0; + } + + if (mode == QSPI_CCR_MEM_MAP) { + return stm32_qspi_mm(op); + } + + return stm32_qspi_poll(op); +} + +static unsigned int stm32_qspi_get_mode(uint8_t buswidth) +{ + if (buswidth == 4U) { + return 3U; + } + + return buswidth; +} + +static int stm32_qspi_exec_op(const struct spi_mem_op *op) +{ + uint64_t timeout; + uint32_t ccr; + size_t addr_max; + uint8_t mode = QSPI_CCR_IND_WRITE; + int ret; + + VERBOSE("%s: cmd:%x mode:%d.%d.%d.%d addr:%" PRIx64 " len:%x\n", + __func__, op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth, + op->dummy.buswidth, op->data.buswidth, + op->addr.val, op->data.nbytes); + + addr_max = op->addr.val + op->data.nbytes + 1U; + + if ((op->data.dir == SPI_MEM_DATA_IN) && (op->data.nbytes != 0U)) { + if ((addr_max < stm32_qspi.mm_size) && + (op->addr.buswidth != 0U)) { + mode = QSPI_CCR_MEM_MAP; + } else { + mode = QSPI_CCR_IND_READ; + } + } + + if (op->data.nbytes != 0U) { + mmio_write_32(qspi_base() + QSPI_DLR, op->data.nbytes - 1U); + } + + ccr = mode << QSPI_CCR_FMODE_SHIFT; + ccr |= op->cmd.opcode; + ccr |= stm32_qspi_get_mode(op->cmd.buswidth) << QSPI_CCR_IMODE_SHIFT; + + if (op->addr.nbytes != 0U) { + ccr |= (op->addr.nbytes - 1U) << QSPI_CCR_ADSIZE_SHIFT; + ccr |= stm32_qspi_get_mode(op->addr.buswidth) << + QSPI_CCR_ADMODE_SHIFT; + } + + if ((op->dummy.buswidth != 0U) && (op->dummy.nbytes != 0U)) { + ccr |= (op->dummy.nbytes * 8U / op->dummy.buswidth) << + QSPI_CCR_DCYC_SHIFT; + } + + if (op->data.nbytes != 0U) { + ccr |= stm32_qspi_get_mode(op->data.buswidth) << + QSPI_CCR_DMODE_SHIFT; + } + + mmio_write_32(qspi_base() + QSPI_CCR, ccr); + + if ((op->addr.nbytes != 0U) && (mode != QSPI_CCR_MEM_MAP)) { + mmio_write_32(qspi_base() + QSPI_AR, op->addr.val); + } + + ret = stm32_qspi_tx(op, mode); + + /* + * Abort in: + * - Error case. + * - Memory mapped read: prefetching must be stopped if we read the last + * byte of device (device size - fifo size). If device size is not + * known then prefetching is always stopped. + */ + if ((ret != 0) || (mode == QSPI_CCR_MEM_MAP)) { + goto abort; + } + + /* Wait end of TX in indirect mode */ + ret = stm32_qspi_wait_cmd(op); + if (ret != 0) { + goto abort; + } + + return 0; + +abort: + mmio_setbits_32(qspi_base() + QSPI_CR, QSPI_CR_ABORT); + + /* Wait clear of abort bit by hardware */ + timeout = timeout_init_us(QSPI_ABT_TIMEOUT_US); + while ((mmio_read_32(qspi_base() + QSPI_CR) & QSPI_CR_ABORT) != 0U) { + if (timeout_elapsed(timeout)) { + ret = -ETIMEDOUT; + break; + } + } + + mmio_write_32(qspi_base() + QSPI_FCR, QSPI_FCR_CTCF); + + if (ret != 0) { + ERROR("%s: exec op error\n", __func__); + } + + return ret; +} + +static int stm32_qspi_claim_bus(unsigned int cs) +{ + uint32_t cr; + + if (cs >= QSPI_MAX_CHIP) { + return -ENODEV; + } + + /* Set chip select and enable the controller */ + cr = QSPI_CR_EN; + if (cs == 1U) { + cr |= QSPI_CR_FSEL; + } + + mmio_clrsetbits_32(qspi_base() + QSPI_CR, QSPI_CR_FSEL, cr); + + return 0; +} + +static void stm32_qspi_release_bus(void) +{ + mmio_clrbits_32(qspi_base() + QSPI_CR, QSPI_CR_EN); +} + +static int stm32_qspi_set_speed(unsigned int hz) +{ + unsigned long qspi_clk = clk_get_rate(stm32_qspi.clock_id); + uint32_t prescaler = UINT8_MAX; + uint32_t csht; + int ret; + + if (qspi_clk == 0U) { + return -EINVAL; + } + + if (hz > 0U) { + prescaler = div_round_up(qspi_clk, hz) - 1U; + if (prescaler > UINT8_MAX) { + prescaler = UINT8_MAX; + } + } + + csht = div_round_up((5U * qspi_clk) / (prescaler + 1U), FREQ_100MHZ); + csht = ((csht - 1U) << QSPI_DCR_CSHT_SHIFT) & QSPI_DCR_CSHT_MASK; + + ret = stm32_qspi_wait_for_not_busy(); + if (ret != 0) { + return ret; + } + + mmio_clrsetbits_32(qspi_base() + QSPI_CR, QSPI_CR_PRESCALER_MASK, + prescaler << QSPI_CR_PRESCALER_SHIFT); + + mmio_clrsetbits_32(qspi_base() + QSPI_DCR, QSPI_DCR_CSHT_MASK, csht); + + VERBOSE("%s: speed=%lu\n", __func__, qspi_clk / (prescaler + 1U)); + + return 0; +} + +static int stm32_qspi_set_mode(unsigned int mode) +{ + int ret; + + ret = stm32_qspi_wait_for_not_busy(); + if (ret != 0) { + return ret; + } + + if ((mode & SPI_CS_HIGH) != 0U) { + return -ENODEV; + } + + if (((mode & SPI_CPHA) != 0U) && ((mode & SPI_CPOL) != 0U)) { + mmio_setbits_32(qspi_base() + QSPI_DCR, QSPI_DCR_CKMODE); + } else if (((mode & SPI_CPHA) == 0U) && ((mode & SPI_CPOL) == 0U)) { + mmio_clrbits_32(qspi_base() + QSPI_DCR, QSPI_DCR_CKMODE); + } else { + return -ENODEV; + } + + VERBOSE("%s: mode=0x%x\n", __func__, mode); + + if ((mode & SPI_RX_QUAD) != 0U) { + VERBOSE("rx: quad\n"); + } else if ((mode & SPI_RX_DUAL) != 0U) { + VERBOSE("rx: dual\n"); + } else { + VERBOSE("rx: single\n"); + } + + if ((mode & SPI_TX_QUAD) != 0U) { + VERBOSE("tx: quad\n"); + } else if ((mode & SPI_TX_DUAL) != 0U) { + VERBOSE("tx: dual\n"); + } else { + VERBOSE("tx: single\n"); + } + + return 0; +} + +static const struct spi_bus_ops stm32_qspi_bus_ops = { + .claim_bus = stm32_qspi_claim_bus, + .release_bus = stm32_qspi_release_bus, + .set_speed = stm32_qspi_set_speed, + .set_mode = stm32_qspi_set_mode, + .exec_op = stm32_qspi_exec_op, +}; + +int stm32_qspi_init(void) +{ + size_t size; + int qspi_node; + struct dt_node_info info; + void *fdt = NULL; + int ret; + + if (fdt_get_address(&fdt) == 0) { + return -FDT_ERR_NOTFOUND; + } + + qspi_node = dt_get_node(&info, -1, DT_QSPI_COMPAT); + if (qspi_node < 0) { + ERROR("No QSPI ctrl found\n"); + return -FDT_ERR_NOTFOUND; + } + + if (info.status == DT_DISABLED) { + return -FDT_ERR_NOTFOUND; + } + + ret = fdt_get_reg_props_by_name(fdt, qspi_node, "qspi", + &stm32_qspi.reg_base, &size); + if (ret != 0) { + return ret; + } + + ret = fdt_get_reg_props_by_name(fdt, qspi_node, "qspi_mm", + &stm32_qspi.mm_base, + &stm32_qspi.mm_size); + if (ret != 0) { + return ret; + } + + if (dt_set_pinctrl_config(qspi_node) != 0) { + return -FDT_ERR_BADVALUE; + } + + if ((info.clock < 0) || (info.reset < 0)) { + return -FDT_ERR_BADVALUE; + } + + stm32_qspi.clock_id = (unsigned long)info.clock; + stm32_qspi.reset_id = (unsigned int)info.reset; + + clk_enable(stm32_qspi.clock_id); + + ret = stm32mp_reset_assert(stm32_qspi.reset_id, TIMEOUT_US_1_MS); + if (ret != 0) { + panic(); + } + ret = stm32mp_reset_deassert(stm32_qspi.reset_id, TIMEOUT_US_1_MS); + if (ret != 0) { + panic(); + } + + mmio_write_32(qspi_base() + QSPI_CR, QSPI_CR_SSHIFT); + mmio_write_32(qspi_base() + QSPI_DCR, QSPI_DCR_FSIZE_MASK); + + return spi_mem_init_slave(fdt, qspi_node, &stm32_qspi_bus_ops); +}; |