summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/wl12xx/spi.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/wireless/wl12xx/spi.c')
-rw-r--r--drivers/net/wireless/wl12xx/spi.c498
1 files changed, 498 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..46714910f98
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/spi.c
@@ -0,0 +1,498 @@
+/*
+ * 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/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);
+ kfree(cmd);
+
+ wl1271_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
+}
+
+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_irq(int irq, void *cookie)
+{
+ struct wl1271 *wl;
+ unsigned long flags;
+
+ wl1271_debug(DEBUG_IRQ, "IRQ");
+
+ wl = cookie;
+
+ /* complete the ELP completion */
+ spin_lock_irqsave(&wl->wl_lock, flags);
+ if (wl->elp_compl) {
+ complete(wl->elp_compl);
+ wl->elp_compl = NULL;
+ }
+
+ if (!test_and_set_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
+ ieee80211_queue_work(wl->hw, &wl->irq_work);
+ set_bit(WL1271_FLAG_IRQ_PENDING, &wl->flags);
+ spin_unlock_irqrestore(&wl->wl_lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+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
+};
+
+static int __devinit wl1271_probe(struct spi_device *spi)
+{
+ struct wl12xx_platform_data *pdata;
+ struct ieee80211_hw *hw;
+ struct wl1271 *wl;
+ 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->irq = spi->irq;
+ if (wl->irq < 0) {
+ wl1271_error("irq missing in platform data");
+ ret = -ENODEV;
+ goto out_free;
+ }
+
+ ret = request_irq(wl->irq, wl1271_irq, 0, DRIVER_NAME, wl);
+ if (ret < 0) {
+ wl1271_error("request_irq() failed: %d", ret);
+ goto out_free;
+ }
+
+ set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
+
+ disable_irq(wl->irq);
+
+ ret = wl1271_init_ieee80211(wl);
+ if (ret)
+ goto out_irq;
+
+ ret = wl1271_register_hw(wl);
+ if (ret)
+ goto out_irq;
+
+ wl1271_notice("initialized");
+
+ 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)
+{
+ int ret;
+
+ ret = spi_register_driver(&wl1271_spi_driver);
+ if (ret < 0) {
+ wl1271_error("failed to register spi driver: %d", ret);
+ goto out;
+ }
+
+out:
+ return ret;
+}
+
+static void __exit wl1271_exit(void)
+{
+ spi_unregister_driver(&wl1271_spi_driver);
+
+ wl1271_notice("unloaded");
+}
+
+module_init(wl1271_init);
+module_exit(wl1271_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Luciano Coelho <luciano.coelho@nokia.com>");
+MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
+MODULE_FIRMWARE(WL1271_FW_NAME);
+MODULE_ALIAS("spi:wl1271");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-11 09:27:08 +0000