wl1271: Moved common IO functions from wl271_spi.c to wl1271_io.c

In prepraration for integration of SDIO implementation moved some IO
functions common for SPI and SDIO to separate file.

Signed-off-by: Teemu Paasikivi <ext-teemu.3.paasikivi@nokia.com>
Reviewed-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 203 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/wl1271_io.c b/drivers/net/wireless/wl12xx/wl1271_io.c
new file mode 100644
index 000000000000..dcb588b4670d
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/wl1271_io.c
@@ -0,0 +1,203 @@
+/*
+ * This file is part of wl1271
+ *
+ * Copyright (C) 2008-2010 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"
+#include "wl1271_io.h"
+
+static int wl1271_translate_addr(struct wl1271 *wl, int addr)
+{
+        /*
+         * To translate, first check to which window of addresses the
+         * particular address belongs. Then subtract the starting address
+         * of that window from the address. Then, add offset of the
+         * translated region.
+         *
+         * The translated regions occur next to each other in physical device
+         * memory, so just add the sizes of the preceeding address regions to
+         * get the offset to the new region.
+         *
+         * Currently, only the two first regions are addressed, and the
+         * assumption is that all addresses will fall into either of those
+         * two.
+         */
+        if ((addr >= wl->part.reg.start) &&
+            (addr < wl->part.reg.start + wl->part.reg.size))
+                return addr - wl->part.reg.start + wl->part.mem.size;
+        else
+                return addr - wl->part.mem.start;
+}
+
+/* Set the SPI partitions to access the chip addresses
+ *
+ * To simplify driver code, a fixed (virtual) memory map is defined for
+ * register and memory addresses. Because in the chipset, in different stages
+ * of operation, those addresses will move around, an address translation
+ * mechanism is required.
+ *
+ * There are four partitions (three memory and one register partition),
+ * which are mapped to two different areas of the hardware memory.
+ *
+ *                                Virtual address
+ *                                     space
+ *
+ *                                    |    |
+ *                                 ...+----+--> mem.start
+ *          Physical address    ...   |    |
+ *               space       ...      |    | [PART_0]
+ *                        ...         |    |
+ *  00000000  <--+----+...         ...+----+--> mem.start + mem.size
+ *               |    |         ...   |    |
+ *               |MEM |      ...      |    |
+ *               |    |   ...         |    |
+ *  mem.size  <--+----+...            |    | {unused area)
+ *               |    |   ...         |    |
+ *               |REG |      ...      |    |
+ *  mem.size     |    |         ...   |    |
+ *      +     <--+----+...         ...+----+--> reg.start
+ *  reg.size     |    |   ...         |    |
+ *               |MEM2|      ...      |    | [PART_1]
+ *               |    |         ...   |    |
+ *                                 ...+----+--> reg.start + reg.size
+ *                                    |    |
+ *
+ */
+int wl1271_set_partition(struct wl1271 *wl,
+                         struct wl1271_partition_set *p)
+{
+        /* copy partition info */
+        memcpy(&wl->part, p, sizeof(*p));
+
+        wl1271_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
+                     p->mem.start, p->mem.size);
+        wl1271_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
+                     p->reg.start, p->reg.size);
+        wl1271_debug(DEBUG_SPI, "mem2_start %08X mem2_size %08X",
+                     p->mem2.start, p->mem2.size);
+        wl1271_debug(DEBUG_SPI, "mem3_start %08X mem3_size %08X",
+                     p->mem3.start, p->mem3.size);
+
+        /* write partition info to the chipset */
+        wl1271_raw_write32(wl, HW_PART0_START_ADDR, p->mem.start);
+        wl1271_raw_write32(wl, HW_PART0_SIZE_ADDR, p->mem.size);
+        wl1271_raw_write32(wl, HW_PART1_START_ADDR, p->reg.start);
+        wl1271_raw_write32(wl, HW_PART1_SIZE_ADDR, p->reg.size);
+        wl1271_raw_write32(wl, HW_PART2_START_ADDR, p->mem2.start);
+        wl1271_raw_write32(wl, HW_PART2_SIZE_ADDR, p->mem2.size);
+        wl1271_raw_write32(wl, HW_PART3_START_ADDR, p->mem3.start);
+
+        return 0;
+}
+
+void wl1271_raw_write(struct wl1271 *wl, int addr, void *buf,
+                      size_t len, bool fixed)
+{
+        wl1271_spi_raw_write(wl, addr, buf, len, fixed);
+}
+
+void wl1271_raw_read(struct wl1271 *wl, int addr, void *buf,
+                     size_t len, bool fixed)
+{
+        wl1271_spi_read(wl, addr, buf, len, fixed);
+}
+
+void wl1271_spi_read(struct wl1271 *wl, int addr, void *buf, size_t len,
+                     bool fixed)
+{
+        int physical;
+
+        physical = wl1271_translate_addr(wl, addr);
+
+        wl1271_spi_raw_read(wl, physical, buf, len, fixed);
+}
+
+void wl1271_spi_write(struct wl1271 *wl, int addr, void *buf, size_t len,
+                      bool fixed)
+{
+        int physical;
+
+        physical = wl1271_translate_addr(wl, addr);
+
+        wl1271_spi_raw_write(wl, physical, buf, len, fixed);
+}
+
+u32 wl1271_spi_read32(struct wl1271 *wl, int addr)
+{
+        return wl1271_raw_read32(wl, wl1271_translate_addr(wl, addr));
+}
+
+void wl1271_spi_write32(struct wl1271 *wl, int addr, u32 val)
+{
+        wl1271_raw_write32(wl, wl1271_translate_addr(wl, addr), val);
+}
+
+void wl1271_top_reg_write(struct wl1271 *wl, int addr, u16 val)
+{
+        /* write address >> 1 + 0x30000 to OCP_POR_CTR */
+        addr = (addr >> 1) + 0x30000;
+        wl1271_spi_write32(wl, OCP_POR_CTR, addr);
+
+        /* write value to OCP_POR_WDATA */
+        wl1271_spi_write32(wl, OCP_DATA_WRITE, val);
+
+        /* write 1 to OCP_CMD */
+        wl1271_spi_write32(wl, OCP_CMD, OCP_CMD_WRITE);
+}
+
+u16 wl1271_top_reg_read(struct wl1271 *wl, int addr)
+{
+        u32 val;
+        int timeout = OCP_CMD_LOOP;
+
+        /* write address >> 1 + 0x30000 to OCP_POR_CTR */
+        addr = (addr >> 1) + 0x30000;
+        wl1271_spi_write32(wl, OCP_POR_CTR, addr);
+
+        /* write 2 to OCP_CMD */
+        wl1271_spi_write32(wl, OCP_CMD, OCP_CMD_READ);
+
+        /* poll for data ready */
+        do {
+                val = wl1271_spi_read32(wl, OCP_DATA_READ);
+        } while (!(val & OCP_READY_MASK) && --timeout);
+
+        if (!timeout) {
+                wl1271_warning("Top register access timed out.");
+                return 0xffff;
+        }
+
+        /* check data status and return if OK */
+        if ((val & OCP_STATUS_MASK) == OCP_STATUS_OK)
+                return val & 0xffff;
+        else {
+                wl1271_warning("Top register access returned error.");
+                return 0xffff;
+        }
+}
+