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);
+}