diff options
Diffstat (limited to 'drivers/net/wireless/wl1251/spi.c')
-rw-r--r-- | drivers/net/wireless/wl1251/spi.c | 346 |
1 files changed, 346 insertions, 0 deletions
diff --git a/drivers/net/wireless/wl1251/spi.c b/drivers/net/wireless/wl1251/spi.c new file mode 100644 index 0000000..88fa8e6 --- /dev/null +++ b/drivers/net/wireless/wl1251/spi.c @@ -0,0 +1,346 @@ +/* + * 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/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 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, +}; + +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; + } + + 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, + .bus = &spi_bus_type, + .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"); |