// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2012 - 2018 Microchip Technology Inc., and its subsidiaries. * All rights reserved. */ #include <linux/clk.h> #include <linux/spi/spi.h> #include <linux/crc7.h> #include <linux/crc-itu-t.h> #include <linux/gpio/consumer.h> #include "netdev.h" #include "cfg80211.h" #define SPI_MODALIAS … static bool enable_crc7; /* protect SPI commands with CRC7 */ module_param(enable_crc7, bool, 0644); MODULE_PARM_DESC(…) …; static bool enable_crc16; /* protect SPI data with CRC16 */ module_param(enable_crc16, bool, 0644); MODULE_PARM_DESC(…) …; /* * For CMD_SINGLE_READ and CMD_INTERNAL_READ, WILC may insert one or * more zero bytes between the command response and the DATA Start tag * (0xf3). This behavior appears to be undocumented in "ATWILC1000 * USER GUIDE" (https://tinyurl.com/4hhshdts) but we have observed 1-4 * zero bytes when the SPI bus operates at 48MHz and none when it * operates at 1MHz. */ #define WILC_SPI_RSP_HDR_EXTRA_DATA … struct wilc_spi { … }; static const struct wilc_hif_func wilc_hif_spi; static int wilc_spi_reset(struct wilc *wilc); static int wilc_spi_configure_bus_protocol(struct wilc *wilc); static int wilc_validate_chipid(struct wilc *wilc); /******************************************** * * Spi protocol Function * ********************************************/ #define CMD_DMA_WRITE … #define CMD_DMA_READ … #define CMD_INTERNAL_WRITE … #define CMD_INTERNAL_READ … #define CMD_TERMINATE … #define CMD_REPEAT … #define CMD_DMA_EXT_WRITE … #define CMD_DMA_EXT_READ … #define CMD_SINGLE_WRITE … #define CMD_SINGLE_READ … #define CMD_RESET … #define SPI_RETRY_MAX_LIMIT … #define SPI_ENABLE_VMM_RETRY_LIMIT … /* SPI response fields (section 11.1.2 in ATWILC1000 User Guide): */ #define RSP_START_FIELD … #define RSP_TYPE_FIELD … /* SPI response values for the response fields: */ #define RSP_START_TAG … #define RSP_TYPE_FIRST_PACKET … #define RSP_TYPE_INNER_PACKET … #define RSP_TYPE_LAST_PACKET … #define RSP_STATE_NO_ERROR … #define PROTOCOL_REG_PKT_SZ_MASK … #define PROTOCOL_REG_CRC16_MASK … #define PROTOCOL_REG_CRC7_MASK … /* * The SPI data packet size may be any integer power of two in the * range from 256 to 8192 bytes. */ #define DATA_PKT_LOG_SZ_MIN … #define DATA_PKT_LOG_SZ_MAX … /* * Select the data packet size (log2 of number of bytes): Use the * maximum data packet size. We only retransmit complete packets, so * there is no benefit from using smaller data packets. */ #define DATA_PKT_LOG_SZ … #define DATA_PKT_SZ … #define WILC_SPI_COMMAND_STAT_SUCCESS … #define WILC_GET_RESP_HDR_START(h) … struct wilc_spi_cmd { … } __packed; struct wilc_spi_read_rsp_data { … } __packed; struct wilc_spi_rsp_data { … } __packed; struct wilc_spi_special_cmd_rsp { … } __packed; static int wilc_parse_gpios(struct wilc *wilc) { … } static void wilc_wlan_power(struct wilc *wilc, bool on) { … } static int wilc_bus_probe(struct spi_device *spi) { … } static void wilc_bus_remove(struct spi_device *spi) { … } static const struct of_device_id wilc_of_match[] = …; MODULE_DEVICE_TABLE(of, wilc_of_match); static const struct spi_device_id wilc_spi_id[] = …; MODULE_DEVICE_TABLE(spi, wilc_spi_id); static struct spi_driver wilc_spi_driver = …; module_spi_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; static int wilc_spi_tx(struct wilc *wilc, u8 *b, u32 len) { … } static int wilc_spi_rx(struct wilc *wilc, u8 *rb, u32 rlen) { … } static int wilc_spi_tx_rx(struct wilc *wilc, u8 *wb, u8 *rb, u32 rlen) { … } static int spi_data_write(struct wilc *wilc, u8 *b, u32 sz) { … } /******************************************** * * Spi Internal Read/Write Function * ********************************************/ static u8 wilc_get_crc7(u8 *buffer, u32 len) { … } static int wilc_spi_single_read(struct wilc *wilc, u8 cmd, u32 adr, void *b, u8 clockless) { … } static int wilc_spi_write_cmd(struct wilc *wilc, u8 cmd, u32 adr, u32 data, u8 clockless) { … } static int wilc_spi_dma_rw(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz) { … } static int wilc_spi_special_cmd(struct wilc *wilc, u8 cmd) { … } static void wilc_spi_reset_cmd_sequence(struct wilc *wl, u8 attempt, u32 addr) { … } static int wilc_spi_read_reg(struct wilc *wilc, u32 addr, u32 *data) { … } static int wilc_spi_read(struct wilc *wilc, u32 addr, u8 *buf, u32 size) { … } static int spi_internal_write(struct wilc *wilc, u32 adr, u32 dat) { … } static int spi_internal_read(struct wilc *wilc, u32 adr, u32 *data) { … } /******************************************** * * Spi interfaces * ********************************************/ static int wilc_spi_write_reg(struct wilc *wilc, u32 addr, u32 data) { … } static int spi_data_rsp(struct wilc *wilc, u8 cmd) { … } static int wilc_spi_write(struct wilc *wilc, u32 addr, u8 *buf, u32 size) { … } /******************************************** * * Bus interfaces * ********************************************/ static int wilc_spi_reset(struct wilc *wilc) { … } static bool wilc_spi_is_init(struct wilc *wilc) { … } static int wilc_spi_deinit(struct wilc *wilc) { … } static int wilc_spi_init(struct wilc *wilc, bool resume) { … } static int wilc_spi_configure_bus_protocol(struct wilc *wilc) { … } static int wilc_validate_chipid(struct wilc *wilc) { … } static int wilc_spi_read_size(struct wilc *wilc, u32 *size) { … } static int wilc_spi_read_int(struct wilc *wilc, u32 *int_status) { … } static int wilc_spi_clear_int_ext(struct wilc *wilc, u32 val) { … } static int wilc_spi_sync_ext(struct wilc *wilc, int nint) { … } /* Global spi HIF function table */ static const struct wilc_hif_func wilc_hif_spi = …;
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