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zephyr/drivers/spi/spi_mchp_mss.c

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/*
* Copyright (c) 2022 Microchip Technology Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT microchip_mpfs_spi
#include <zephyr/device.h>
#include <zephyr/drivers/spi.h>
#include <zephyr/sys/sys_io.h>
#include <zephyr/sys/util.h>
#include <zephyr/logging/log.h>
#include <zephyr/irq.h>
LOG_MODULE_REGISTER(mss_spi, CONFIG_SPI_LOG_LEVEL);
#include "spi_context.h"
/* MSS SPI Register offsets */
#define MSS_SPI_REG_CONTROL (0x00)
#define MSS_SPI_REG_TXRXDF_SIZE (0x04)
#define MSS_SPI_REG_STATUS (0x08)
#define MSS_SPI_REG_INT_CLEAR (0x0c)
#define MSS_SPI_REG_RX_DATA (0x10)
#define MSS_SPI_REG_TX_DATA (0x14)
#define MSS_SPI_REG_CLK_GEN (0x18)
#define MSS_SPI_REG_SS (0x1c)
#define MSS_SPI_REG_MIS (0x20)
#define MSS_SPI_REG_RIS (0x24)
#define MSS_SPI_REG_CONTROL2 (0x28)
#define MSS_SPI_REG_COMMAND (0x2c)
#define MSS_SPI_REG_PKTSIZE (0x30)
#define MSS_SPI_REG_CMD_SIZE (0x34)
#define MSS_SPI_REG_HWSTATUS (0x38)
#define MSS_SPI_REG_FRAMESUP (0x50)
/* SPICR bit definitions */
#define MSS_SPI_CONTROL_ENABLE BIT(0)
#define MSS_SPI_CONTROL_MASTER BIT(1)
#define MSS_SPI_CONTROL_PROTO_MSK BIT(2)
#define MSS_SPI_CONTROL_PROTO_MOTO (0 << 2)
#define MSS_SPI_CONTROL_RX_DATA_INT BIT(4)
#define MSS_SPI_CONTROL_TX_DATA_INT BIT(5)
#define MSS_SPI_CONTROL_RX_OVER_INT BIT(6)
#define MSS_SPI_CONTROL_TX_UNDER_INT BIT(7)
#define MSS_SPI_CONTROL_CNT_MSK (0xffff << 8)
#define MSS_SPI_CONTROL_CNT_SHF (8)
#define MSS_SPI_CONTROL_SPO BIT(24)
#define MSS_SPI_CONTROL_SPH BIT(25)
#define MSS_SPI_CONTROL_SPS BIT(26)
#define MSS_SPI_CONTROL_FRAMEURUN BIT(27)
#define MSS_SPI_CONTROL_CLKMODE BIT(28)
#define MSS_SPI_CONTROL_BIGFIFO BIT(29)
#define MSS_SPI_CONTROL_OENOFF BIT(30)
#define MSS_SPI_CONTROL_RESET BIT(31)
/* SPIFRAMESIZE bit definitions */
#define MSS_SPI_FRAMESIZE_DEFAULT (8)
/* SPISS bit definitions */
#define MSS_SPI_SSEL_MASK (0xff)
#define MSS_SPI_DIRECT (0x100)
#define MSS_SPI_SSELOUT (0x200)
#define MSS_SPI_MIN_SLAVE (0)
#define MSS_SPI_MAX_SLAVE (7)
/* SPIST bit definitions */
#define MSS_SPI_STATUS_ACTIVE BIT(14)
#define MSS_SPI_STATUS_SSEL BIT(13)
#define MSS_SPI_STATUS_FRAMESTART BIT(12)
#define MSS_SPI_STATUS_TXFIFO_EMPTY_NEXT_READ BIT(11)
#define MSS_SPI_STATUS_TXFIFO_EMPTY BIT(10)
#define MSS_SPI_STATUS_TXFIFO_FULL_NEXT_WRITE BIT(9)
#define MSS_SPI_STATUS_TXFIFO_FULL BIT(8)
#define MSS_SPI_STATUS_RXFIFO_EMPTY_NEXT_READ BIT(7)
#define MSS_SPI_STATUS_RXFIFO_EMPTY BIT(6)
#define MSS_SPI_STATUS_RXFIFO_FULL_NEXT_WRITE BIT(5)
#define MSS_SPI_STATUS_RXFIFO_FULL BIT(4)
#define MSS_SPI_STATUS_TX_UNDERRUN BIT(3)
#define MSS_SPI_STATUS_RX_OVERFLOW BIT(2)
#define MSS_SPI_STATUS_RXDAT_RCED BIT(1)
#define MSS_SPI_STATUS_TXDAT_SENT BIT(0)
/* SPIINT register defines */
#define MSS_SPI_INT_TXDONE BIT(0)
#define MSS_SPI_INT_RXRDY BIT(1)
#define MSS_SPI_INT_RX_CH_OVRFLW BIT(2)
#define MSS_SPI_INT_TX_CH_UNDRUN BIT(3)
#define MSS_SPI_INT_CMD BIT(4)
#define MSS_SPI_INT_SSEND BIT(5)
/* SPICOMMAND bit definitions */
#define MSS_SPI_COMMAND_FIFO_MASK (0xC)
/* SPIFRAMESUP bit definitions */
#define MSS_SPI_FRAMESUP_UP_BYTES_MSK (0xFFFF << 16)
#define MSS_SPI_FRAMESUP_LO_BYTES_MSK (0xFFFF << 0)
struct mss_spi_config {
mm_reg_t base;
uint8_t clk_gen;
int clock_freq;
};
struct mss_spi_transfer {
uint32_t rx_len;
uint32_t control;
};
struct mss_spi_data {
struct spi_context ctx;
struct mss_spi_transfer xfer;
};
static inline uint32_t mss_spi_read(const struct mss_spi_config *cfg, mm_reg_t offset)
{
return sys_read32(cfg->base + offset);
}
static inline void mss_spi_write(const struct mss_spi_config *cfg, mm_reg_t offset, uint32_t val)
{
sys_write32(val, cfg->base + offset);
}
static inline void mss_spi_hw_tfsz_set(const struct mss_spi_config *cfg, int len)
{
uint32_t control;
mss_spi_write(cfg, MSS_SPI_REG_FRAMESUP, (len & MSS_SPI_FRAMESUP_UP_BYTES_MSK));
control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
control &= ~MSS_SPI_CONTROL_CNT_MSK;
control |= ((len & MSS_SPI_FRAMESUP_LO_BYTES_MSK) << MSS_SPI_CONTROL_CNT_SHF);
mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
}
static inline void mss_spi_enable_controller(const struct mss_spi_config *cfg)
{
uint32_t control;
control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
control |= MSS_SPI_CONTROL_ENABLE;
mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
}
static inline void mss_spi_disable_controller(const struct mss_spi_config *cfg)
{
uint32_t control;
control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
control &= ~MSS_SPI_CONTROL_ENABLE;
mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
}
static void mss_spi_enable_ints(const struct mss_spi_config *cfg)
{
uint32_t control;
uint32_t mask = MSS_SPI_CONTROL_RX_DATA_INT | MSS_SPI_CONTROL_TX_DATA_INT |
MSS_SPI_CONTROL_RX_OVER_INT | MSS_SPI_CONTROL_TX_UNDER_INT;
control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
control |= mask;
mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
}
static void mss_spi_disable_ints(const struct mss_spi_config *cfg)
{
uint32_t control;
uint32_t mask = MSS_SPI_CONTROL_RX_DATA_INT | MSS_SPI_CONTROL_TX_DATA_INT |
MSS_SPI_CONTROL_RX_OVER_INT | MSS_SPI_CONTROL_TX_UNDER_INT;
mask = ~mask;
control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
control &= ~mask;
mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
}
static inline void mss_spi_readwr_fifo(const struct device *dev)
{
const struct mss_spi_config *cfg = dev->config;
struct mss_spi_data *data = dev->data;
struct spi_context *ctx = &data->ctx;
struct mss_spi_transfer *xfer = &data->xfer;
uint32_t rx_raw = 0, rd_byte_size, tr_len;
uint32_t data8, transfer_idx = 0;
int count;
tr_len = spi_context_longest_current_buf(ctx);
count = spi_context_total_tx_len(ctx);
if (ctx->rx_buf) {
rd_byte_size = count - tr_len;
} else {
rd_byte_size = 0;
}
mss_spi_hw_tfsz_set(cfg, count);
mss_spi_enable_ints(cfg);
spi_context_update_rx(ctx, 1, xfer->rx_len);
while (transfer_idx < count) {
if (!(mss_spi_read(cfg, MSS_SPI_REG_STATUS) & MSS_SPI_STATUS_RXFIFO_EMPTY)) {
rx_raw = mss_spi_read(cfg, MSS_SPI_REG_RX_DATA);
if (transfer_idx >= tr_len) {
if (spi_context_rx_buf_on(ctx)) {
UNALIGNED_PUT(rx_raw, (uint8_t *)ctx->rx_buf);
spi_context_update_rx(ctx, 1, 1);
}
}
++transfer_idx;
}
if (!(mss_spi_read(cfg, MSS_SPI_REG_STATUS) & MSS_SPI_STATUS_TXFIFO_FULL)) {
if (spi_context_tx_buf_on(ctx)) {
data8 = ctx->tx_buf[0];
mss_spi_write(cfg, MSS_SPI_REG_TX_DATA, data8);
spi_context_update_tx(ctx, 1, 1);
} else {
mss_spi_write(cfg, MSS_SPI_REG_TX_DATA, 0x0);
}
}
}
}
static inline int mss_spi_select_slave(const struct mss_spi_config *cfg, int cs)
{
uint32_t slave;
uint32_t reg = mss_spi_read(cfg, MSS_SPI_REG_SS);
slave = (cs >= MSS_SPI_MIN_SLAVE && cs <= MSS_SPI_MAX_SLAVE) ? (1 << cs) : 0;
reg &= ~MSS_SPI_SSEL_MASK;
reg |= slave;
mss_spi_write(cfg, MSS_SPI_REG_SS, reg);
return 0;
}
static inline void mss_spi_activate_cs(struct mss_spi_config *cfg)
{
uint32_t reg = mss_spi_read(cfg, MSS_SPI_REG_SS);
reg |= MSS_SPI_SSELOUT;
mss_spi_write(cfg, MSS_SPI_REG_SS, reg);
}
static inline void mss_spi_deactivate_cs(const struct mss_spi_config *cfg)
{
uint32_t reg = mss_spi_read(cfg, MSS_SPI_REG_SS);
reg &= ~MSS_SPI_SSELOUT;
mss_spi_write(cfg, MSS_SPI_REG_SS, reg);
}
static inline int mss_spi_clk_gen_set(const struct mss_spi_config *cfg,
const struct spi_config *spi_cfg)
{
uint32_t idx, clkrate, val = 0, speed;
if (spi_cfg->frequency > cfg->clock_freq) {
speed = cfg->clock_freq / 2;
}
for (idx = 1; idx < 16; idx++) {
clkrate = cfg->clock_freq / (2 * idx);
if (clkrate <= spi_cfg->frequency) {
val = idx;
break;
}
}
mss_spi_write(cfg, MSS_SPI_REG_CLK_GEN, val);
return 0;
}
static inline int mss_spi_hw_mode_set(const struct mss_spi_config *cfg, unsigned int mode)
{
uint32_t control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
/* set the mode */
if (mode & SPI_MODE_CPHA) {
control |= MSS_SPI_CONTROL_SPH;
} else {
control &= ~MSS_SPI_CONTROL_SPH;
}
if (mode & SPI_MODE_CPOL) {
control |= MSS_SPI_CONTROL_SPO;
} else {
control &= ~MSS_SPI_CONTROL_SPO;
}
mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
return 0;
}
static void mss_spi_interrupt(const struct device *dev)
{
const struct mss_spi_config *cfg = dev->config;
struct mss_spi_data *data = dev->data;
struct spi_context *ctx = &data->ctx;
int intfield = mss_spi_read(cfg, MSS_SPI_REG_MIS) & 0xf;
if (intfield == 0) {
return;
}
mss_spi_write(cfg, MSS_SPI_REG_INT_CLEAR, intfield);
spi_context_complete(ctx, dev, 0);
}
static int mss_spi_release(const struct device *dev, const struct spi_config *config)
{
const struct mss_spi_config *cfg = dev->config;
struct mss_spi_data *data = dev->data;
mss_spi_disable_ints(cfg);
/* release kernel resources */
spi_context_unlock_unconditionally(&data->ctx);
mss_spi_disable_controller(cfg);
return 0;
}
static int mss_spi_configure(const struct device *dev, const struct spi_config *spi_cfg)
{
const struct mss_spi_config *cfg = dev->config;
struct mss_spi_data *data = dev->data;
struct spi_context *ctx = &data->ctx;
struct mss_spi_transfer *xfer = &data->xfer;
uint32_t control;
if (spi_cfg->operation & (SPI_TRANSFER_LSB | SPI_OP_MODE_SLAVE | SPI_MODE_LOOP)) {
LOG_WRN("not supported operation\n\r");
return -ENOTSUP;
}
if (SPI_WORD_SIZE_GET(spi_cfg->operation) != MSS_SPI_FRAMESIZE_DEFAULT) {
return -ENOTSUP;
}
ctx->config = spi_cfg;
mss_spi_select_slave(cfg, spi_cfg->slave);
control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
/*
* Fill up the default values
* Slave select behaviour set
* Fifo depth greater than 4 frames
* Methodology to calculate SPI Clock:
* 0: SPICLK = 1 / (2 CLK_GEN + 1) , CLK_GEN is from 0 to 15
* 1: SPICLK = 1 / (2 * (CLK_GEN + 1)) , CLK_GEN is from 0 to 255
*/
mss_spi_write(cfg, MSS_SPI_REG_CONTROL, xfer->control);
if (mss_spi_clk_gen_set(cfg, spi_cfg)) {
LOG_ERR("can't set clk divider\n");
return -EINVAL;
}
mss_spi_hw_mode_set(cfg, spi_cfg->operation);
mss_spi_write(cfg, MSS_SPI_REG_TXRXDF_SIZE, MSS_SPI_FRAMESIZE_DEFAULT);
mss_spi_enable_controller(cfg);
mss_spi_write(cfg, MSS_SPI_REG_COMMAND, MSS_SPI_COMMAND_FIFO_MASK);
return 0;
}
static int mss_spi_transceive(const struct device *dev, const struct spi_config *spi_cfg,
const struct spi_buf_set *tx_bufs, const struct spi_buf_set *rx_bufs,
bool async, spi_callback_t cb, void *userdata)
{
const struct mss_spi_config *config = dev->config;
struct mss_spi_data *data = dev->data;
struct spi_context *ctx = &data->ctx;
struct mss_spi_transfer *xfer = &data->xfer;
int ret = 0;
spi_context_lock(ctx, async, cb, userdata, spi_cfg);
ret = mss_spi_configure(dev, spi_cfg);
if (ret) {
LOG_ERR("Fail to configure\n\r");
goto out;
}
spi_context_buffers_setup(ctx, tx_bufs, rx_bufs, 1);
xfer->rx_len = ctx->rx_len;
mss_spi_readwr_fifo(dev);
ret = spi_context_wait_for_completion(ctx);
out:
spi_context_release(ctx, ret);
mss_spi_disable_ints(config);
mss_spi_disable_controller(config);
return ret;
}
static int mss_spi_transceive_blocking(const struct device *dev, const struct spi_config *spi_cfg,
const struct spi_buf_set *tx_bufs,
const struct spi_buf_set *rx_bufs)
{
return mss_spi_transceive(dev, spi_cfg, tx_bufs, rx_bufs, false, NULL, NULL);
}
#ifdef CONFIG_SPI_ASYNC
static int mss_spi_transceive_async(const struct device *dev, const struct spi_config *spi_cfg,
const struct spi_buf_set *tx_bufs,
const struct spi_buf_set *rx_bufs, spi_callback_t cb,
void *userdata)
{
return mss_spi_transceive(dev, spi_cfg, tx_bufs, rx_bufs, true, cb, userdata);
}
#endif /* CONFIG_SPI_ASYNC */
static int mss_spi_init(const struct device *dev)
{
const struct mss_spi_config *cfg = dev->config;
struct mss_spi_data *data = dev->data;
struct mss_spi_transfer *xfer = &data->xfer;
int ret = 0;
uint32_t control = 0;
/* Remove SPI from Reset */
control = mss_spi_read(cfg, MSS_SPI_REG_CONTROL);
control &= ~MSS_SPI_CONTROL_RESET;
mss_spi_write(cfg, MSS_SPI_REG_CONTROL, control);
/* Set master mode */
mss_spi_disable_controller(cfg);
xfer->control = (MSS_SPI_CONTROL_SPS | MSS_SPI_CONTROL_BIGFIFO | MSS_SPI_CONTROL_MASTER |
MSS_SPI_CONTROL_CLKMODE);
spi_context_unlock_unconditionally(&data->ctx);
return ret;
}
#define MICROCHIP_SPI_PM_OPS (NULL)
static const struct spi_driver_api mss_spi_driver_api = {
.transceive = mss_spi_transceive_blocking,
#ifdef CONFIG_SPI_ASYNC
.transceive_async = mss_spi_transceive_async,
#endif /* CONFIG_SPI_ASYNC */
.release = mss_spi_release,
};
#define MSS_SPI_INIT(n) \
static int mss_spi_init_##n(const struct device *dev) \
{ \
mss_spi_init(dev); \
\
IRQ_CONNECT(DT_INST_IRQN(n), DT_INST_IRQ(n, priority), mss_spi_interrupt, \
DEVICE_DT_INST_GET(n), 0); \
\
irq_enable(DT_INST_IRQN(n)); \
\
return 0; \
} \
\
static const struct mss_spi_config mss_spi_config_##n = { \
.base = DT_INST_REG_ADDR(n), \
.clock_freq = DT_INST_PROP(n, clock_frequency), \
}; \
\
static struct mss_spi_data mss_spi_data_##n = { \
SPI_CONTEXT_INIT_LOCK(mss_spi_data_##n, ctx), \
SPI_CONTEXT_INIT_SYNC(mss_spi_data_##n, ctx), \
}; \
\
DEVICE_DT_INST_DEFINE(n, mss_spi_init_##n, NULL, &mss_spi_data_##n, &mss_spi_config_##n, \
POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
&mss_spi_driver_api);
DT_INST_FOREACH_STATUS_OKAY(MSS_SPI_INIT)
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