blob: fec8fce21d606156fa431bdabcee228fd8936e21 [file] [log] [blame]
/*
* Copyright (c) 2021 BrainCo Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT gd_gd32_spi
#include <errno.h>
#include <zephyr/kernel.h>
#include <zephyr/drivers/pinctrl.h>
#include <zephyr/drivers/spi.h>
#include <gd32_rcu.h>
#include <gd32_spi.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(spi_gd32);
#include "spi_context.h"
/* SPI error status mask. */
#define SPI_GD32_ERR_MASK (SPI_STAT_RXORERR | SPI_STAT_CONFERR | SPI_STAT_CRCERR)
#define GD32_SPI_PSC_MAX 0x7U
#if defined(CONFIG_SOC_SERIES_GD32F4XX) || \
defined(CONFIG_SOC_SERIES_GD32F403) || \
defined(CONFIG_SOC_SERIES_GD32VF103) || \
defined(CONFIG_SOC_SERIES_GD32E10X)
#define RCU_APB1EN_OFFSET APB1EN_REG_OFFSET
#elif defined(CONFIG_SOC_SERIES_GD32F3X0)
#define RCU_APB1EN_OFFSET IDX_APB1EN
#else
#error Unknown GD32 soc series
#endif
/* Obtain RCU register offset from RCU clock value */
#define RCU_CLOCK_OFFSET(rcu_clock) ((rcu_clock) >> 6U)
struct spi_gd32_config {
uint32_t reg;
uint32_t rcu_periph_clock;
const struct pinctrl_dev_config *pcfg;
};
struct spi_gd32_data {
struct spi_context ctx;
};
static int spi_gd32_get_err(const struct spi_gd32_config *cfg)
{
uint32_t stat = SPI_STAT(cfg->reg);
if (stat & SPI_GD32_ERR_MASK) {
LOG_ERR("spi%u error status detected, err = %u",
cfg->reg, stat & (uint32_t)SPI_GD32_ERR_MASK);
return -EIO;
}
return 0;
}
static bool spi_gd32_transfer_ongoing(struct spi_gd32_data *data)
{
return spi_context_tx_on(&data->ctx) ||
spi_context_rx_on(&data->ctx);
}
static uint32_t spi_gd32_bus_freq_get(uint32_t rcu_periph_clock)
{
uint32_t rcu_bus;
if (RCU_CLOCK_OFFSET(rcu_periph_clock) == RCU_APB1EN_OFFSET) {
rcu_bus = CK_APB1;
} else {
rcu_bus = CK_APB2;
}
return rcu_clock_freq_get(rcu_bus);
}
static int spi_gd32_configure(const struct device *dev,
const struct spi_config *config)
{
struct spi_gd32_data *data = dev->data;
const struct spi_gd32_config *cfg = dev->config;
uint32_t bus_freq;
if (spi_context_configured(&data->ctx, config)) {
return 0;
}
if (SPI_OP_MODE_GET(config->operation) == SPI_OP_MODE_SLAVE) {
LOG_ERR("Slave mode not supported");
return -ENOTSUP;
}
SPI_CTL0(cfg->reg) &= ~SPI_CTL0_SPIEN;
SPI_CTL0(cfg->reg) |= SPI_MASTER;
SPI_CTL0(cfg->reg) &= ~SPI_TRANSMODE_BDTRANSMIT;
if (SPI_WORD_SIZE_GET(config->operation) == 8) {
SPI_CTL0(cfg->reg) |= SPI_FRAMESIZE_8BIT;
} else {
SPI_CTL0(cfg->reg) |= SPI_FRAMESIZE_16BIT;
}
/* Reset to hardware NSS mode. */
SPI_CTL0(cfg->reg) &= ~SPI_CTL0_SWNSSEN;
if (config->cs != NULL) {
SPI_CTL0(cfg->reg) |= SPI_CTL0_SWNSSEN;
} else {
/*
* For single master env,
* hardware NSS mode also need to set the NSSDRV bit.
*/
SPI_CTL1(cfg->reg) |= SPI_CTL1_NSSDRV;
}
SPI_CTL0(cfg->reg) &= ~SPI_CTL0_LF;
if (config->operation & SPI_TRANSFER_LSB) {
SPI_CTL0(cfg->reg) |= SPI_CTL0_LF;
}
SPI_CTL0(cfg->reg) &= ~SPI_CTL0_CKPL;
if (config->operation & SPI_MODE_CPOL) {
SPI_CTL0(cfg->reg) |= SPI_CTL0_CKPL;
}
SPI_CTL0(cfg->reg) &= ~SPI_CTL0_CKPH;
if (config->operation & SPI_MODE_CPHA) {
SPI_CTL0(cfg->reg) |= SPI_CTL0_CKPH;
}
bus_freq = spi_gd32_bus_freq_get(cfg->rcu_periph_clock);
for (uint8_t i = 0U; i <= GD32_SPI_PSC_MAX; i++) {
bus_freq = bus_freq >> 1U;
if (bus_freq <= config->frequency) {
SPI_CTL0(cfg->reg) &= ~SPI_CTL0_PSC;
SPI_CTL0(cfg->reg) |= CTL0_PSC(i);
break;
}
}
data->ctx.config = config;
return 0;
}
static int spi_gd32_frame_exchange(const struct device *dev)
{
struct spi_gd32_data *data = dev->data;
const struct spi_gd32_config *cfg = dev->config;
struct spi_context *ctx = &data->ctx;
uint16_t tx_frame = 0U, rx_frame = 0U;
if (SPI_WORD_SIZE_GET(ctx->config->operation) == 8) {
if (spi_context_tx_buf_on(ctx)) {
tx_frame = UNALIGNED_GET((uint8_t *)(data->ctx.tx_buf));
}
/* For 8 bits mode, spi will forced SPI_DATA[15:8] to 0. */
SPI_DATA(cfg->reg) = tx_frame;
spi_context_update_tx(ctx, 1, 1);
} else {
if (spi_context_tx_buf_on(ctx)) {
tx_frame = UNALIGNED_GET((uint8_t *)(data->ctx.tx_buf));
}
SPI_DATA(cfg->reg) = tx_frame;
spi_context_update_tx(ctx, 2, 1);
}
while ((SPI_STAT(cfg->reg) & SPI_STAT_RBNE) == 0) {
/* NOP */
}
if (SPI_WORD_SIZE_GET(data->ctx.config->operation) == 8) {
/* For 8 bits mode, spi will forced SPI_DATA[15:8] to 0. */
rx_frame = SPI_DATA(cfg->reg);
if (spi_context_rx_buf_on(ctx)) {
UNALIGNED_PUT(rx_frame, (uint8_t *)data->ctx.rx_buf);
}
spi_context_update_rx(ctx, 1, 1);
} else {
rx_frame = SPI_DATA(cfg->reg);
if (spi_context_rx_buf_on(ctx)) {
UNALIGNED_PUT(rx_frame, (uint16_t *)data->ctx.rx_buf);
}
spi_context_update_rx(ctx, 2, 1);
}
return spi_gd32_get_err(cfg);
}
static int spi_gd32_transceive(const struct device *dev,
const struct spi_config *config,
const struct spi_buf_set *tx_bufs,
const struct spi_buf_set *rx_bufs)
{
struct spi_gd32_data *data = dev->data;
const struct spi_gd32_config *cfg = dev->config;
int ret;
spi_context_lock(&data->ctx, false, NULL, config);
ret = spi_gd32_configure(dev, config);
if (ret < 0) {
goto error;
}
SPI_CTL0(cfg->reg) |= SPI_CTL0_SPIEN;
spi_context_buffers_setup(&data->ctx, tx_bufs, rx_bufs, 1);
spi_context_cs_control(&data->ctx, true);
do {
ret = spi_gd32_frame_exchange(dev);
if (ret < 0) {
break;
}
} while (spi_gd32_transfer_ongoing(data));
spi_context_cs_control(&data->ctx, false);
SPI_CTL0(cfg->reg) &= ~SPI_CTL0_SPIEN;
error:
spi_context_release(&data->ctx, ret);
return ret;
}
static int spi_gd32_release(const struct device *dev,
const struct spi_config *config)
{
struct spi_gd32_data *data = dev->data;
spi_context_unlock_unconditionally(&data->ctx);
return 0;
}
static struct spi_driver_api spi_gd32_driver_api = {
.transceive = spi_gd32_transceive,
.release = spi_gd32_release
};
int spi_gd32_init(const struct device *dev)
{
struct spi_gd32_data *data = dev->data;
const struct spi_gd32_config *cfg = dev->config;
int ret;
rcu_periph_clock_enable(cfg->rcu_periph_clock);
ret = pinctrl_apply_state(cfg->pcfg, PINCTRL_STATE_DEFAULT);
if (ret) {
LOG_ERR("Failed to apply pinctrl state");
return ret;
}
ret = spi_context_cs_configure_all(&data->ctx);
if (ret < 0) {
return ret;
}
spi_context_unlock_unconditionally(&data->ctx);
return 0;
}
#define GD32_SPI_INIT(idx) \
PINCTRL_DT_INST_DEFINE(idx); \
static struct spi_gd32_data spi_gd32_data_##idx = { \
SPI_CONTEXT_INIT_LOCK(spi_gd32_data_##idx, ctx), \
SPI_CONTEXT_INIT_SYNC(spi_gd32_data_##idx, ctx), \
SPI_CONTEXT_CS_GPIOS_INITIALIZE(DT_DRV_INST(idx), ctx) \
}; \
static struct spi_gd32_config spi_gd32_config_##idx = { \
.reg = DT_INST_REG_ADDR(idx), \
.rcu_periph_clock = DT_INST_PROP(idx, rcu_periph_clock), \
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(idx), \
}; \
DEVICE_DT_INST_DEFINE(idx, &spi_gd32_init, NULL, &spi_gd32_data_##idx, \
&spi_gd32_config_##idx, POST_KERNEL, \
CONFIG_SPI_INIT_PRIORITY, &spi_gd32_driver_api);
DT_INST_FOREACH_STATUS_OKAY(GD32_SPI_INIT)