/* * This file is part of wl1251 * * Copyright (C) 2008 Nokia Corporation * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA * */ #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/crc7.h> #include <linux/spi/spi.h> #include <linux/wl12xx.h> #include "wl1251.h" #include "reg.h" #include "spi.h" static irqreturn_t wl1251_irq(int irq, void *cookie) { struct wl1251 *wl; wl1251_debug(DEBUG_IRQ, "IRQ"); wl = cookie; ieee80211_queue_work(wl->hw, &wl->irq_work); return IRQ_HANDLED; } static struct spi_device *wl_to_spi(struct wl1251 *wl) { return wl->if_priv; } static void wl1251_spi_reset(struct wl1251 *wl) { u8 *cmd; struct spi_transfer t; struct spi_message m; cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); if (!cmd) { wl1251_error("could not allocate cmd for spi reset"); return; } memset(&t, 0, sizeof(t)); spi_message_init(&m); memset(cmd, 0xff, WSPI_INIT_CMD_LEN); t.tx_buf = cmd; t.len = WSPI_INIT_CMD_LEN; spi_message_add_tail(&t, &m); spi_sync(wl_to_spi(wl), &m); wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN); } static void wl1251_spi_wake(struct wl1251 *wl) { u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd; struct spi_transfer t; struct spi_message m; cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); if (!cmd) { wl1251_error("could not allocate cmd for spi init"); return; } memset(crc, 0, sizeof(crc)); memset(&t, 0, sizeof(t)); spi_message_init(&m); /* * Set WSPI_INIT_COMMAND * the data is being send from the MSB to LSB */ cmd[2] = 0xff; cmd[3] = 0xff; cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX; cmd[0] = 0; cmd[7] = 0; cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3; cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN; if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0) cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY; else cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY; cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS; crc[0] = cmd[1]; crc[1] = cmd[0]; crc[2] = cmd[7]; crc[3] = cmd[6]; crc[4] = cmd[5]; cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1; cmd[4] |= WSPI_INIT_CMD_END; t.tx_buf = cmd; t.len = WSPI_INIT_CMD_LEN; spi_message_add_tail(&t, &m); spi_sync(wl_to_spi(wl), &m); wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN); } static void wl1251_spi_reset_wake(struct wl1251 *wl) { wl1251_spi_reset(wl); wl1251_spi_wake(wl); } static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf, size_t len) { struct spi_transfer t[3]; struct spi_message m; u8 *busy_buf; u32 *cmd; cmd = &wl->buffer_cmd; busy_buf = wl->buffer_busyword; *cmd = 0; *cmd |= WSPI_CMD_READ; *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; *cmd |= addr & WSPI_CMD_BYTE_ADDR; spi_message_init(&m); memset(t, 0, sizeof(t)); t[0].tx_buf = cmd; t[0].len = 4; spi_message_add_tail(&t[0], &m); /* Busy and non busy words read */ t[1].rx_buf = busy_buf; t[1].len = WL1251_BUSY_WORD_LEN; spi_message_add_tail(&t[1], &m); t[2].rx_buf = buf; t[2].len = len; spi_message_add_tail(&t[2], &m); spi_sync(wl_to_spi(wl), &m); /* FIXME: check busy words */ wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd)); wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len); } static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf, size_t len) { struct spi_transfer t[2]; struct spi_message m; u32 *cmd; cmd = &wl->buffer_cmd; *cmd = 0; *cmd |= WSPI_CMD_WRITE; *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; *cmd |= addr & WSPI_CMD_BYTE_ADDR; spi_message_init(&m); memset(t, 0, sizeof(t)); t[0].tx_buf = cmd; t[0].len = sizeof(*cmd); spi_message_add_tail(&t[0], &m); t[1].tx_buf = buf; t[1].len = len; spi_message_add_tail(&t[1], &m); spi_sync(wl_to_spi(wl), &m); wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd)); wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len); } static void wl1251_spi_enable_irq(struct wl1251 *wl) { return enable_irq(wl->irq); } static void wl1251_spi_disable_irq(struct wl1251 *wl) { return disable_irq(wl->irq); } static int wl1251_spi_set_power(struct wl1251 *wl, bool enable) { if (wl->set_power) wl->set_power(enable); return 0; } static const struct wl1251_if_operations wl1251_spi_ops = { .read = wl1251_spi_read, .write = wl1251_spi_write, .reset = wl1251_spi_reset_wake, .enable_irq = wl1251_spi_enable_irq, .disable_irq = wl1251_spi_disable_irq, .power = wl1251_spi_set_power, }; static int __devinit wl1251_spi_probe(struct spi_device *spi) { struct wl12xx_platform_data *pdata; struct ieee80211_hw *hw; struct wl1251 *wl; int ret; pdata = spi->dev.platform_data; if (!pdata) { wl1251_error("no platform data"); return -ENODEV; } hw = wl1251_alloc_hw(); if (IS_ERR(hw)) return PTR_ERR(hw); wl = hw->priv; SET_IEEE80211_DEV(hw, &spi->dev); dev_set_drvdata(&spi->dev, wl); wl->if_priv = spi; wl->if_ops = &wl1251_spi_ops; /* This is the only SPI value that we need to set here, the rest * comes from the board-peripherals file */ spi->bits_per_word = 32; ret = spi_setup(spi); if (ret < 0) { wl1251_error("spi_setup failed"); goto out_free; } wl->set_power = pdata->set_power; if (!wl->set_power) { wl1251_error("set power function missing in platform data"); return -ENODEV; } wl->irq = spi->irq; if (wl->irq < 0) { wl1251_error("irq missing in platform data"); return -ENODEV; } wl->use_eeprom = pdata->use_eeprom; ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl); if (ret < 0) { wl1251_error("request_irq() failed: %d", ret); goto out_free; } irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING); disable_irq(wl->irq); ret = wl1251_init_ieee80211(wl); if (ret) goto out_irq; return 0; out_irq: free_irq(wl->irq, wl); out_free: ieee80211_free_hw(hw); return ret; } static int __devexit wl1251_spi_remove(struct spi_device *spi) { struct wl1251 *wl = dev_get_drvdata(&spi->dev); free_irq(wl->irq, wl); wl1251_free_hw(wl); return 0; } static struct spi_driver wl1251_spi_driver = { .driver = { .name = DRIVER_NAME, .owner = THIS_MODULE, }, .probe = wl1251_spi_probe, .remove = __devexit_p(wl1251_spi_remove), }; static int __init wl1251_spi_init(void) { int ret; ret = spi_register_driver(&wl1251_spi_driver); if (ret < 0) { wl1251_error("failed to register spi driver: %d", ret); goto out; } out: return ret; } static void __exit wl1251_spi_exit(void) { spi_unregister_driver(&wl1251_spi_driver); wl1251_notice("unloaded"); } module_init(wl1251_spi_init); module_exit(wl1251_spi_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>"); MODULE_ALIAS("spi:wl1251");