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 000000000000..88fa8e69d0d1
--- /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");