1 files changed, 493 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/spi.c b/drivers/net/wireless/wl12xx/spi.c
new file mode 100644
index 00000000000..e0b3736d7e1
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/spi.c
@@ -0,0 +1,493 @@
+/*
+ * This file is part of wl1271
+ *
+ * Copyright (C) 2008-2009 Nokia Corporation
+ *
+ * Contact: Luciano Coelho <luciano.coelho@nokia.com>
+ *
+ * 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/crc7.h>
+#include <linux/spi/spi.h>
+#include <linux/wl12xx.h>
+#include <linux/slab.h>
+
+#include "wl12xx.h"
+#include "wl12xx_80211.h"
+#include "io.h"
+
+#include "reg.h"
+
+#define WSPI_CMD_READ                 0x40000000
+#define WSPI_CMD_WRITE                0x00000000
+#define WSPI_CMD_FIXED                0x20000000
+#define WSPI_CMD_BYTE_LENGTH          0x1FFE0000
+#define WSPI_CMD_BYTE_LENGTH_OFFSET   17
+#define WSPI_CMD_BYTE_ADDR            0x0001FFFF
+
+#define WSPI_INIT_CMD_CRC_LEN       5
+
+#define WSPI_INIT_CMD_START         0x00
+#define WSPI_INIT_CMD_TX            0x40
+/* the extra bypass bit is sampled by the TNET as '1' */
+#define WSPI_INIT_CMD_BYPASS_BIT    0x80
+#define WSPI_INIT_CMD_FIXEDBUSY_LEN 0x07
+#define WSPI_INIT_CMD_EN_FIXEDBUSY  0x80
+#define WSPI_INIT_CMD_DIS_FIXEDBUSY 0x00
+#define WSPI_INIT_CMD_IOD           0x40
+#define WSPI_INIT_CMD_IP            0x20
+#define WSPI_INIT_CMD_CS            0x10
+#define WSPI_INIT_CMD_WS            0x08
+#define WSPI_INIT_CMD_WSPI          0x01
+#define WSPI_INIT_CMD_END           0x01
+
+#define WSPI_INIT_CMD_LEN           8
+
+#define HW_ACCESS_WSPI_FIXED_BUSY_LEN \
+                ((WL1271_BUSY_WORD_LEN - 4) / sizeof(u32))
+#define HW_ACCESS_WSPI_INIT_CMD_MASK  0
+
+/* HW limitation: maximum possible chunk size is 4095 bytes */
+#define WSPI_MAX_CHUNK_SIZE    4092
+
+#define WSPI_MAX_NUM_OF_CHUNKS (WL1271_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE)
+
+static inline struct spi_device *wl_to_spi(struct wl1271 *wl)
+{
+        return wl->if_priv;
+}
+
+static struct device *wl1271_spi_wl_to_dev(struct wl1271 *wl)
+{
+        return &(wl_to_spi(wl)->dev);
+}
+
+static void wl1271_spi_disable_interrupts(struct wl1271 *wl)
+{
+        disable_irq(wl->irq);
+}
+
+static void wl1271_spi_enable_interrupts(struct wl1271 *wl)
+{
+        enable_irq(wl->irq);
+}
+
+static void wl1271_spi_reset(struct wl1271 *wl)
+{
+        u8 *cmd;
+        struct spi_transfer t;
+        struct spi_message m;
+
+        cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
+        if (!cmd) {
+                wl1271_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);
+
+        wl1271_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
+        kfree(cmd);
+}
+
+static void wl1271_spi_init(struct wl1271 *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) {
+                wl1271_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);
+        wl1271_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
+        kfree(cmd);
+}
+
+#define WL1271_BUSY_WORD_TIMEOUT 1000
+
+static int wl1271_spi_read_busy(struct wl1271 *wl)
+{
+        struct spi_transfer t[1];
+        struct spi_message m;
+        u32 *busy_buf;
+        int num_busy_bytes = 0;
+
+        /*
+         * Read further busy words from SPI until a non-busy word is
+         * encountered, then read the data itself into the buffer.
+         */
+
+        num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT;
+        busy_buf = wl->buffer_busyword;
+        while (num_busy_bytes) {
+                num_busy_bytes--;
+                spi_message_init(&m);
+                memset(t, 0, sizeof(t));
+                t[0].rx_buf = busy_buf;
+                t[0].len = sizeof(u32);
+                t[0].cs_change = true;
+                spi_message_add_tail(&t[0], &m);
+                spi_sync(wl_to_spi(wl), &m);
+
+                if (*busy_buf & 0x1)
+                        return 0;
+        }
+
+        /* The SPI bus is unresponsive, the read failed. */
+        wl1271_error("SPI read busy-word timeout!\n");
+        return -ETIMEDOUT;
+}
+
+static void wl1271_spi_raw_read(struct wl1271 *wl, int addr, void *buf,
+                                size_t len, bool fixed)
+{
+        struct spi_transfer t[2];
+        struct spi_message m;
+        u32 *busy_buf;
+        u32 *cmd;
+        u32 chunk_len;
+
+        while (len > 0) {
+                chunk_len = min((size_t)WSPI_MAX_CHUNK_SIZE, len);
+
+                cmd = &wl->buffer_cmd;
+                busy_buf = wl->buffer_busyword;
+
+                *cmd = 0;
+                *cmd |= WSPI_CMD_READ;
+                *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
+                        WSPI_CMD_BYTE_LENGTH;
+                *cmd |= addr & WSPI_CMD_BYTE_ADDR;
+
+                if (fixed)
+                        *cmd |= WSPI_CMD_FIXED;
+
+                spi_message_init(&m);
+                memset(t, 0, sizeof(t));
+
+                t[0].tx_buf = cmd;
+                t[0].len = 4;
+                t[0].cs_change = true;
+                spi_message_add_tail(&t[0], &m);
+
+                /* Busy and non busy words read */
+                t[1].rx_buf = busy_buf;
+                t[1].len = WL1271_BUSY_WORD_LEN;
+                t[1].cs_change = true;
+                spi_message_add_tail(&t[1], &m);
+
+                spi_sync(wl_to_spi(wl), &m);
+
+                if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) &&
+                    wl1271_spi_read_busy(wl)) {
+                        memset(buf, 0, chunk_len);
+                        return;
+                }
+
+                spi_message_init(&m);
+                memset(t, 0, sizeof(t));
+
+                t[0].rx_buf = buf;
+                t[0].len = chunk_len;
+                t[0].cs_change = true;
+                spi_message_add_tail(&t[0], &m);
+
+                spi_sync(wl_to_spi(wl), &m);
+
+                wl1271_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
+                wl1271_dump(DEBUG_SPI, "spi_read buf <- ", buf, chunk_len);
+
+                if (!fixed)
+                        addr += chunk_len;
+                buf += chunk_len;
+                len -= chunk_len;
+        }
+}
+
+static void wl1271_spi_raw_write(struct wl1271 *wl, int addr, void *buf,
+                          size_t len, bool fixed)
+{
+        struct spi_transfer t[2 * WSPI_MAX_NUM_OF_CHUNKS];
+        struct spi_message m;
+        u32 commands[WSPI_MAX_NUM_OF_CHUNKS];
+        u32 *cmd;
+        u32 chunk_len;
+        int i;
+
+        WARN_ON(len > WL1271_AGGR_BUFFER_SIZE);
+
+        spi_message_init(&m);
+        memset(t, 0, sizeof(t));
+
+        cmd = &commands[0];
+        i = 0;
+        while (len > 0) {
+                chunk_len = min((size_t)WSPI_MAX_CHUNK_SIZE, len);
+
+                *cmd = 0;
+                *cmd |= WSPI_CMD_WRITE;
+                *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
+                        WSPI_CMD_BYTE_LENGTH;
+                *cmd |= addr & WSPI_CMD_BYTE_ADDR;
+
+                if (fixed)
+                        *cmd |= WSPI_CMD_FIXED;
+
+                t[i].tx_buf = cmd;
+                t[i].len = sizeof(*cmd);
+                spi_message_add_tail(&t[i++], &m);
+
+                t[i].tx_buf = buf;
+                t[i].len = chunk_len;
+                spi_message_add_tail(&t[i++], &m);
+
+                wl1271_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
+                wl1271_dump(DEBUG_SPI, "spi_write buf -> ", buf, chunk_len);
+
+                if (!fixed)
+                        addr += chunk_len;
+                buf += chunk_len;
+                len -= chunk_len;
+                cmd++;
+        }
+
+        spi_sync(wl_to_spi(wl), &m);
+}
+
+static irqreturn_t wl1271_hardirq(int irq, void *cookie)
+{
+        struct wl1271 *wl = cookie;
+        unsigned long flags;
+
+        wl1271_debug(DEBUG_IRQ, "IRQ");
+
+        /* complete the ELP completion */
+        spin_lock_irqsave(&wl->wl_lock, flags);
+        set_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags);
+        if (wl->elp_compl) {
+                complete(wl->elp_compl);
+                wl->elp_compl = NULL;
+        }
+        spin_unlock_irqrestore(&wl->wl_lock, flags);
+
+        return IRQ_WAKE_THREAD;
+}
+
+static int wl1271_spi_set_power(struct wl1271 *wl, bool enable)
+{
+        if (wl->set_power)
+                wl->set_power(enable);
+
+        return 0;
+}
+
+static struct wl1271_if_operations spi_ops = {
+        .read           = wl1271_spi_raw_read,
+        .write          = wl1271_spi_raw_write,
+        .reset          = wl1271_spi_reset,
+        .init           = wl1271_spi_init,
+        .power          = wl1271_spi_set_power,
+        .dev            = wl1271_spi_wl_to_dev,
+        .enable_irq     = wl1271_spi_enable_interrupts,
+        .disable_irq    = wl1271_spi_disable_interrupts,
+        .set_block_size = NULL,
+};
+
+static int __devinit wl1271_probe(struct spi_device *spi)
+{
+        struct wl12xx_platform_data *pdata;
+        struct ieee80211_hw *hw;
+        struct wl1271 *wl;
+        unsigned long irqflags;
+        int ret;
+
+        pdata = spi->dev.platform_data;
+        if (!pdata) {
+                wl1271_error("no platform data");
+                return -ENODEV;
+        }
+
+        hw = wl1271_alloc_hw();
+        if (IS_ERR(hw))
+                return PTR_ERR(hw);
+
+        wl = hw->priv;
+
+        dev_set_drvdata(&spi->dev, wl);
+        wl->if_priv = spi;
+
+        wl->if_ops = &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) {
+                wl1271_error("spi_setup failed");
+                goto out_free;
+        }
+
+        wl->set_power = pdata->set_power;
+        if (!wl->set_power) {
+                wl1271_error("set power function missing in platform data");
+                ret = -ENODEV;
+                goto out_free;
+        }
+
+        wl->ref_clock = pdata->board_ref_clock;
+        wl->tcxo_clock = pdata->board_tcxo_clock;
+        wl->platform_quirks = pdata->platform_quirks;
+
+        if (wl->platform_quirks & WL12XX_PLATFORM_QUIRK_EDGE_IRQ)
+                irqflags = IRQF_TRIGGER_RISING;
+        else
+                irqflags = IRQF_TRIGGER_HIGH | IRQF_ONESHOT;
+
+        wl->irq = spi->irq;
+        if (wl->irq < 0) {
+                wl1271_error("irq missing in platform data");
+                ret = -ENODEV;
+                goto out_free;
+        }
+
+        ret = request_threaded_irq(wl->irq, wl1271_hardirq, wl1271_irq,
+                                   irqflags,
+                                   DRIVER_NAME, wl);
+        if (ret < 0) {
+                wl1271_error("request_irq() failed: %d", ret);
+                goto out_free;
+        }
+
+        disable_irq(wl->irq);
+
+        ret = wl1271_init_ieee80211(wl);
+        if (ret)
+                goto out_irq;
+
+        ret = wl1271_register_hw(wl);
+        if (ret)
+                goto out_irq;
+
+        return 0;
+
+ out_irq:
+        free_irq(wl->irq, wl);
+
+ out_free:
+        wl1271_free_hw(wl);
+
+        return ret;
+}
+
+static int __devexit wl1271_remove(struct spi_device *spi)
+{
+        struct wl1271 *wl = dev_get_drvdata(&spi->dev);
+
+        wl1271_unregister_hw(wl);
+        free_irq(wl->irq, wl);
+        wl1271_free_hw(wl);
+
+        return 0;
+}
+
+
+static struct spi_driver wl1271_spi_driver = {
+        .driver = {
+                .name           = "wl1271_spi",
+                .bus            = &spi_bus_type,
+                .owner          = THIS_MODULE,
+        },
+
+        .probe          = wl1271_probe,
+        .remove         = __devexit_p(wl1271_remove),
+};
+
+static int __init wl1271_init(void)
+{
+        return spi_register_driver(&wl1271_spi_driver);
+}
+
+static void __exit wl1271_exit(void)
+{
+        spi_unregister_driver(&wl1271_spi_driver);
+}
+
+module_init(wl1271_init);
+module_exit(wl1271_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
+MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
+MODULE_FIRMWARE(WL1271_FW_NAME);
+MODULE_FIRMWARE(WL128X_FW_NAME);
+MODULE_FIRMWARE(WL127X_AP_FW_NAME);
+MODULE_FIRMWARE(WL128X_AP_FW_NAME);
+MODULE_ALIAS("spi:wl1271");