| /** |
| * Copyright (c) 2018 Linaro |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| #define LOG_LEVEL CONFIG_WIFI_LOG_LEVEL |
| #include <logging/log.h> |
| LOG_MODULE_REGISTER(wifi_eswifi_bus_spi); |
| |
| #include <zephyr.h> |
| #include <kernel.h> |
| #include <device.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <gpio.h> |
| #include <spi.h> |
| |
| #include "eswifi.h" |
| |
| #define ESWIFI_SPI_THREAD_STACK_SIZE 1024 |
| K_THREAD_STACK_MEMBER(eswifi_spi_poll_stack, ESWIFI_SPI_THREAD_STACK_SIZE); |
| |
| #define SPI_READ_CHUNK_SIZE 32 |
| |
| struct eswifi_spi_data { |
| struct device *spi_dev; |
| struct eswifi_gpio csn; |
| struct eswifi_gpio dr; |
| struct k_thread poll_thread; |
| struct spi_config spi_cfg; |
| struct spi_cs_control spi_cs; |
| }; |
| |
| static struct eswifi_spi_data eswifi_spi0; /* Static instance */ |
| |
| static bool eswifi_spi_cmddata_ready(struct eswifi_spi_data *spi) |
| { |
| int value; |
| |
| gpio_pin_read(spi->dr.dev, spi->dr.pin, &value); |
| |
| return value ? true : false; |
| } |
| |
| static int eswifi_spi_wait_cmddata_ready(struct eswifi_spi_data *spi) |
| { |
| unsigned int max_retries = 60 * 1000; /* 1 minute */ |
| |
| do { |
| /* allow other threads to be scheduled */ |
| k_sleep(1); |
| } while (!eswifi_spi_cmddata_ready(spi) && --max_retries); |
| |
| return max_retries ? 0 : -ETIMEDOUT; |
| } |
| |
| static int eswifi_spi_write(struct eswifi_dev *eswifi, char *data, size_t dlen) |
| { |
| struct eswifi_spi_data *spi = eswifi->bus_data; |
| struct spi_buf spi_tx_buf[1]; |
| struct spi_buf_set spi_tx; |
| int status; |
| |
| spi_tx_buf[0].buf = data; |
| spi_tx_buf[0].len = dlen / 2; /* 16-bit words */ |
| spi_tx.buffers = spi_tx_buf; |
| spi_tx.count = ARRAY_SIZE(spi_tx_buf); |
| |
| status = spi_write(spi->spi_dev, &spi->spi_cfg, &spi_tx); |
| if (status) { |
| LOG_ERR("SPI write error %d", status); |
| } else { |
| status = dlen; |
| } |
| |
| return status; |
| } |
| |
| static int eswifi_spi_read(struct eswifi_dev *eswifi, char *data, size_t dlen) |
| { |
| struct eswifi_spi_data *spi = eswifi->bus_data; |
| struct spi_buf spi_rx_buf[1]; |
| struct spi_buf_set spi_rx; |
| int status; |
| |
| spi_rx_buf[0].buf = data; |
| spi_rx_buf[0].len = dlen / 2; /* 16-bit words */ |
| spi_rx.buffers = spi_rx_buf; |
| spi_rx.count = ARRAY_SIZE(spi_rx_buf); |
| |
| status = spi_read(spi->spi_dev, &spi->spi_cfg, &spi_rx); |
| if (status) { |
| LOG_ERR("SPI read error %d", status); |
| } else { |
| status = dlen; |
| } |
| |
| return status; |
| } |
| |
| static int eswifi_spi_request(struct eswifi_dev *eswifi, char *cmd, size_t clen, |
| char *rsp, size_t rlen) |
| { |
| struct eswifi_spi_data *spi = eswifi->bus_data; |
| unsigned int offset = 0, to_read = SPI_READ_CHUNK_SIZE; |
| char tmp[2]; |
| int err; |
| |
| LOG_DBG("cmd=%p (%u byte), rsp=%p (%u byte)", cmd, clen, rsp, rlen); |
| |
| /* |
| * CMD/DATA protocol: |
| * 1. Module raises data-ready when ready for **command phase** |
| * 2. Host announces command start by lowering chip-select (csn) |
| * 3. Host write the command (possibly several spi transfers) |
| * 4. Host announces end of command by raising chip-select |
| * 5. Module lowers data-ready signal |
| * 6. Module raises data-ready to signal start of the **data phase** |
| * 7. Host lowers chip-select |
| * 8. Host fetch data as long as data-ready pin is up |
| * 9. Module lowers data-ready to signal the end of the data Phase |
| * 10. Host raises chip-select |
| * |
| * Note: |
| * All commands to the eS-WiFi module must be post-padded with |
| * 0x0A (Line Feed) to an even number of bytes. |
| * All data from eS-WiFi module are post-padded with 0x15(NAK) to an |
| * even number of bytes. |
| */ |
| |
| if (!cmd) { |
| goto data; |
| } |
| |
| /* CMD/DATA READY signals the Command Phase */ |
| err = eswifi_spi_wait_cmddata_ready(spi); |
| if (err) { |
| LOG_ERR("CMD ready timeout\n"); |
| return err; |
| } |
| |
| if (clen % 2) { /* Add post-padding if necessary */ |
| /* cmd is a string so cmd[clen] is 0x00 */ |
| cmd[clen] = 0x0a; |
| clen++; |
| } |
| |
| eswifi_spi_write(eswifi, cmd, clen); |
| |
| /* Our device is flagged with SPI_HOLD_ON_CS|SPI_LOCK_ON, release */ |
| spi_release(spi->spi_dev, &spi->spi_cfg); |
| |
| data: |
| /* CMD/DATA READY signals the Data Phase */ |
| err = eswifi_spi_wait_cmddata_ready(spi); |
| if (err) { |
| LOG_ERR("DATA ready timeout\n"); |
| return err; |
| } |
| |
| while (eswifi_spi_cmddata_ready(spi) && to_read) { |
| to_read = min(rlen - offset, to_read); |
| memset(rsp + offset, 0, to_read); |
| eswifi_spi_read(eswifi, rsp + offset, to_read); |
| offset += to_read; |
| k_yield(); |
| } |
| |
| /* Flush remaining data if receiving buffer not large enough */ |
| while (eswifi_spi_cmddata_ready(spi)) { |
| eswifi_spi_read(eswifi, tmp, 2); |
| k_sleep(1); |
| } |
| |
| /* Our device is flagged with SPI_HOLD_ON_CS|SPI_LOCK_ON, release */ |
| spi_release(spi->spi_dev, &spi->spi_cfg); |
| |
| LOG_DBG("success"); |
| |
| return offset; |
| } |
| |
| static void eswifi_spi_read_msg(struct eswifi_dev *eswifi) |
| { |
| char cmd[] = "MR\r"; |
| char *rsp; |
| int err; |
| |
| eswifi_lock(eswifi); |
| |
| err = eswifi_at_cmd_rsp(eswifi, cmd, &rsp); |
| if (err < 0) { |
| LOG_ERR("Unable to read msg %d", err); |
| } |
| |
| eswifi_unlock(eswifi); |
| } |
| |
| static void eswifi_spi_poll_thread(void *p1) |
| { |
| struct eswifi_dev *eswifi = p1; |
| |
| while (1) { |
| k_sleep(K_MSEC(1000)); |
| eswifi_spi_read_msg(eswifi); |
| } |
| } |
| |
| int eswifi_spi_init(struct eswifi_dev *eswifi) |
| { |
| struct eswifi_spi_data *spi = &eswifi_spi0; /* Static instance */ |
| |
| /* SPI DEV */ |
| spi->spi_dev = device_get_binding(DT_INVENTEK_ESWIFI_ESWIFI0_BUS_NAME); |
| if (!spi->spi_dev) { |
| LOG_ERR("Failed to initialize SPI driver"); |
| return -ENODEV; |
| } |
| |
| /* SPI DATA READY PIN */ |
| spi->dr.dev = device_get_binding( |
| DT_INVENTEK_ESWIFI_ESWIFI0_DATA_GPIOS_CONTROLLER); |
| if (!spi->dr.dev) { |
| LOG_ERR("Failed to initialize GPIO driver: %s", |
| DT_INVENTEK_ESWIFI_ESWIFI0_DATA_GPIOS_CONTROLLER); |
| return -ENODEV; |
| } |
| spi->dr.pin = DT_INVENTEK_ESWIFI_ESWIFI0_DATA_GPIOS_PIN; |
| gpio_pin_configure(spi->dr.dev, spi->dr.pin, GPIO_DIR_IN); |
| |
| |
| /* SPI CONFIG/CS */ |
| spi->spi_cfg.frequency = DT_INVENTEK_ESWIFI_ESWIFI0_SPI_MAX_FREQUENCY; |
| spi->spi_cfg.operation = (SPI_OP_MODE_MASTER | SPI_TRANSFER_MSB | |
| SPI_WORD_SET(16) | SPI_LINES_SINGLE | |
| SPI_HOLD_ON_CS | SPI_LOCK_ON); |
| spi->spi_cfg.slave = DT_INVENTEK_ESWIFI_ESWIFI0_BASE_ADDRESS; |
| spi->spi_cs.gpio_dev = |
| device_get_binding(DT_INVENTEK_ESWIFI_ESWIFI0_CS_GPIO_CONTROLLER); |
| spi->spi_cs.gpio_pin = DT_INVENTEK_ESWIFI_ESWIFI0_CS_GPIO_PIN; |
| spi->spi_cs.delay = 1000; |
| spi->spi_cfg.cs = &spi->spi_cs; |
| |
| eswifi->bus_data = spi; |
| |
| LOG_DBG("success"); |
| |
| k_thread_create(&spi->poll_thread, eswifi_spi_poll_stack, |
| ESWIFI_SPI_THREAD_STACK_SIZE, |
| (k_thread_entry_t)eswifi_spi_poll_thread, eswifi, NULL, |
| NULL, K_PRIO_COOP(CONFIG_WIFI_ESWIFI_THREAD_PRIO), 0, |
| K_NO_WAIT); |
| |
| return 0; |
| } |
| |
| struct eswifi_bus_ops eswifi_bus_ops_spi = { |
| .init = eswifi_spi_init, |
| .request = eswifi_spi_request, |
| }; |