wl1271: add wl1271 driver files

This driver supports the wl1271 chipset from Texas Instruments based on the
WiLink(tm) 6.0 mobile platform.  Support for wl1273 should be relatively easy
to add.  This chipset is designed for embedded devices, with good powersaving
capabilities.  The wl1271 chipset is the successor of wl1251 and supports the
802.11b/g/n standards, but currently this driver supports only b/g.

More information about this chipset can be found here:
http://focus.ti.com/general/docs/wtbu/wtbuproductcontent.tsp?templateId=6123&navigationId=12762&contentId=29993

Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 382 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/wl1271_spi.c b/drivers/net/wireless/wl12xx/wl1271_spi.c
new file mode 100644
index 000000000000..4a12880c16a8
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/wl1271_spi.c
@@ -0,0 +1,382 @@
+/*
+ * 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/module.h>
+#include <linux/platform_device.h>
+#include <linux/crc7.h>
+#include <linux/spi/spi.h>
+
+#include "wl1271.h"
+#include "wl12xx_80211.h"
+#include "wl1271_spi.h"
+
+static int wl1271_translate_reg_addr(struct wl1271 *wl, int addr)
+{
+        return addr - wl->physical_reg_addr + wl->virtual_reg_addr;
+}
+
+static int wl1271_translate_mem_addr(struct wl1271 *wl, int addr)
+{
+        return addr - wl->physical_mem_addr + wl->virtual_mem_addr;
+}
+
+
+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->spi, &m);
+
+        wl1271_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
+}
+
+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->spi, &m);
+
+        wl1271_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
+}
+
+/* Set the SPI partitions to access the chip addresses
+ *
+ * There are two VIRTUAL (SPI) partitions (the memory partition and the
+ * registers partition), which are mapped to two different areas of the
+ * PHYSICAL (hardware) memory.  This function also makes other checks to
+ * ensure that the partitions are not overlapping.  In the diagram below, the
+ * memory partition comes before the register partition, but the opposite is
+ * also supported.
+ *
+ *                               PHYSICAL address
+ *                                     space
+ *
+ *                                    |    |
+ *                                 ...+----+--> mem_start
+ *          VIRTUAL address     ...   |    |
+ *               space       ...      |    | [PART_0]
+ *                        ...         |    |
+ * 0x00000000 <--+----+...         ...+----+--> mem_start + mem_size
+ *               |    |         ...   |    |
+ *               |MEM |      ...      |    |
+ *               |    |   ...         |    |
+ *  part_size <--+----+...            |    | {unused area)
+ *               |    |   ...         |    |
+ *               |REG |      ...      |    |
+ *  part_size    |    |         ...   |    |
+ *      +     <--+----+...         ...+----+--> reg_start
+ *  reg_size              ...         |    |
+ *                           ...      |    | [PART_1]
+ *                              ...   |    |
+ *                                 ...+----+--> reg_start + reg_size
+ *                                    |    |
+ *
+ */
+int wl1271_set_partition(struct wl1271 *wl,
+                          u32 mem_start, u32 mem_size,
+                          u32 reg_start, u32 reg_size)
+{
+        struct wl1271_partition *partition;
+        struct spi_transfer t;
+        struct spi_message m;
+        size_t len, cmd_len;
+        u32 *cmd;
+        int addr;
+
+        cmd_len = sizeof(u32) + 2 * sizeof(struct wl1271_partition);
+        cmd = kzalloc(cmd_len, GFP_KERNEL);
+        if (!cmd)
+                return -ENOMEM;
+
+        spi_message_init(&m);
+        memset(&t, 0, sizeof(t));
+
+        partition = (struct wl1271_partition *) (cmd + 1);
+        addr = HW_ACCESS_PART0_SIZE_ADDR;
+        len = 2 * sizeof(struct wl1271_partition);
+
+        *cmd |= WSPI_CMD_WRITE;
+        *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
+        *cmd |= addr & WSPI_CMD_BYTE_ADDR;
+
+        wl1271_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
+                     mem_start, mem_size);
+        wl1271_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
+                     reg_start, reg_size);
+
+        /* Make sure that the two partitions together don't exceed the
+         * address range */
+        if ((mem_size + reg_size) > HW_ACCESS_MEMORY_MAX_RANGE) {
+                wl1271_debug(DEBUG_SPI, "Total size exceeds maximum virtual"
+                             " address range.  Truncating partition[0].");
+                mem_size = HW_ACCESS_MEMORY_MAX_RANGE - reg_size;
+                wl1271_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
+                             mem_start, mem_size);
+                wl1271_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
+                             reg_start, reg_size);
+        }
+
+        if ((mem_start < reg_start) &&
+            ((mem_start + mem_size) > reg_start)) {
+                /* Guarantee that the memory partition doesn't overlap the
+                 * registers partition */
+                wl1271_debug(DEBUG_SPI, "End of partition[0] is "
+                             "overlapping partition[1].  Adjusted.");
+                mem_size = reg_start - mem_start;
+                wl1271_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
+                             mem_start, mem_size);
+                wl1271_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
+                             reg_start, reg_size);
+        } else if ((reg_start < mem_start) &&
+                   ((reg_start + reg_size) > mem_start)) {
+                /* Guarantee that the register partition doesn't overlap the
+                 * memory partition */
+                wl1271_debug(DEBUG_SPI, "End of partition[1] is"
+                             " overlapping partition[0].  Adjusted.");
+                reg_size = mem_start - reg_start;
+                wl1271_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
+                             mem_start, mem_size);
+                wl1271_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
+                             reg_start, reg_size);
+        }
+
+        partition[0].start = mem_start;
+        partition[0].size  = mem_size;
+        partition[1].start = reg_start;
+        partition[1].size  = reg_size;
+
+        wl->physical_mem_addr = mem_start;
+        wl->physical_reg_addr = reg_start;
+
+        wl->virtual_mem_addr = 0;
+        wl->virtual_reg_addr = mem_size;
+
+        t.tx_buf = cmd;
+        t.len = cmd_len;
+        spi_message_add_tail(&t, &m);
+
+        spi_sync(wl->spi, &m);
+
+        kfree(cmd);
+
+        return 0;
+}
+
+void wl1271_spi_read(struct wl1271 *wl, int addr, void *buf,
+                     size_t len, bool fixed)
+{
+        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;
+
+        if (fixed)
+                *cmd |= WSPI_CMD_FIXED;
+
+        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 = WL1271_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->spi, &m);
+
+        /* FIXME: check busy words */
+
+        wl1271_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
+        wl1271_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
+}
+
+void wl1271_spi_write(struct wl1271 *wl, int addr, void *buf,
+                      size_t len, bool fixed)
+{
+        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;
+
+        if (fixed)
+                *cmd |= WSPI_CMD_FIXED;
+
+        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->spi, &m);
+
+        wl1271_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
+        wl1271_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
+}
+
+void wl1271_spi_mem_read(struct wl1271 *wl, int addr, void *buf,
+                         size_t len)
+{
+        int physical;
+
+        physical = wl1271_translate_mem_addr(wl, addr);
+
+        wl1271_spi_read(wl, physical, buf, len, false);
+}
+
+void wl1271_spi_mem_write(struct wl1271 *wl, int addr, void *buf,
+                          size_t len)
+{
+        int physical;
+
+        physical = wl1271_translate_mem_addr(wl, addr);
+
+        wl1271_spi_write(wl, physical, buf, len, false);
+}
+
+void wl1271_spi_reg_read(struct wl1271 *wl, int addr, void *buf, size_t len,
+                         bool fixed)
+{
+        int physical;
+
+        physical = wl1271_translate_reg_addr(wl, addr);
+
+        wl1271_spi_read(wl, physical, buf, len, fixed);
+}
+
+void wl1271_spi_reg_write(struct wl1271 *wl, int addr, void *buf, size_t len,
+                          bool fixed)
+{
+        int physical;
+
+        physical = wl1271_translate_reg_addr(wl, addr);
+
+        wl1271_spi_write(wl, physical, buf, len, fixed);
+}
+
+u32 wl1271_mem_read32(struct wl1271 *wl, int addr)
+{
+        return wl1271_read32(wl, wl1271_translate_mem_addr(wl, addr));
+}
+
+void wl1271_mem_write32(struct wl1271 *wl, int addr, u32 val)
+{
+        wl1271_write32(wl, wl1271_translate_mem_addr(wl, addr), val);
+}
+
+u32 wl1271_reg_read32(struct wl1271 *wl, int addr)
+{
+        return wl1271_read32(wl, wl1271_translate_reg_addr(wl, addr));
+}
+
+void wl1271_reg_write32(struct wl1271 *wl, int addr, u32 val)
+{
+        wl1271_write32(wl, wl1271_translate_reg_addr(wl, addr), val);
+}