Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6

1 files changed, 358 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..abdf171a47e
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/spi.c
@@ -0,0 +1,358 @@
+/*
+ * This file is part of wl12xx
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * Contact: Kalle Valo <kalle.valo@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/crc7.h>
+#include <linux/spi/spi.h>
+
+#include "wl12xx.h"
+#include "wl12xx_80211.h"
+#include "reg.h"
+#include "spi.h"
+#include "ps.h"
+
+static int wl12xx_translate_reg_addr(struct wl12xx *wl, int addr)
+{
+	/* If the address is lower than REGISTERS_BASE, it means that this is
+	 * a chip-specific register address, so look it up in the registers
+	 * table */
+	if (addr < REGISTERS_BASE) {
+		/* Make sure we don't go over the table */
+		if (addr >= ACX_REG_TABLE_LEN) {
+			wl12xx_error("address out of range (%d)", addr);
+			return -EINVAL;
+		}
+		addr = wl->chip.acx_reg_table[addr];
+	}
+
+	return addr - wl->physical_reg_addr + wl->virtual_reg_addr;
+}
+
+static int wl12xx_translate_mem_addr(struct wl12xx *wl, int addr)
+{
+	return addr - wl->physical_mem_addr + wl->virtual_mem_addr;
+}
+
+
+void wl12xx_spi_reset(struct wl12xx *wl)
+{
+	u8 *cmd;
+	struct spi_transfer t;
+	struct spi_message m;
+
+	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
+	if (!cmd) {
+		wl12xx_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);
+
+	wl12xx_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
+}
+
+void wl12xx_spi_init(struct wl12xx *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) {
+		wl12xx_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);
+
+	wl12xx_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
+ *                                    |    |
+ *
+ */
+void wl12xx_set_partition(struct wl12xx *wl,
+			  u32 mem_start, u32 mem_size,
+			  u32 reg_start, u32 reg_size)
+{
+	u8 tx_buf[sizeof(u32) + 2 * sizeof(struct wl12xx_partition)];
+	struct wl12xx_partition *partition;
+	struct spi_transfer t;
+	struct spi_message m;
+	u32 *cmd;
+	size_t len;
+	int addr;
+
+	spi_message_init(&m);
+	memset(&t, 0, sizeof(t));
+	memset(tx_buf, 0, sizeof(tx_buf));
+
+	cmd = (u32 *) tx_buf;
+	partition = (struct wl12xx_partition *) (tx_buf + sizeof(u32));
+	addr = HW_ACCESS_PART0_SIZE_ADDR;
+	len = 2 * sizeof(struct wl12xx_partition);
+
+	*cmd |= WSPI_CMD_WRITE;
+	*cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
+	*cmd |= addr & WSPI_CMD_BYTE_ADDR;
+
+	wl12xx_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
+		     mem_start, mem_size);
+	wl12xx_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) {
+		wl12xx_debug(DEBUG_SPI, "Total size exceeds maximum virtual"
+			     " address range.  Truncating partition[0].");
+		mem_size = HW_ACCESS_MEMORY_MAX_RANGE - reg_size;
+		wl12xx_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
+			     mem_start, mem_size);
+		wl12xx_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 */
+		wl12xx_debug(DEBUG_SPI, "End of partition[0] is "
+			     "overlapping partition[1].  Adjusted.");
+		mem_size = reg_start - mem_start;
+		wl12xx_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
+			     mem_start, mem_size);
+		wl12xx_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 */
+		wl12xx_debug(DEBUG_SPI, "End of partition[1] is"
+			     " overlapping partition[0].  Adjusted.");
+		reg_size = mem_start - reg_start;
+		wl12xx_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
+			     mem_start, mem_size);
+		wl12xx_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 = tx_buf;
+	t.len = sizeof(tx_buf);
+	spi_message_add_tail(&t, &m);
+
+	spi_sync(wl->spi, &m);
+}
+
+void wl12xx_spi_read(struct wl12xx *wl, int addr, void *buf,
+		     size_t len)
+{
+	struct spi_transfer t[3];
+	struct spi_message m;
+	char busy_buf[TNETWIF_READ_OFFSET_BYTES];
+	u32 cmd;
+
+	cmd = 0;
+	cmd |= WSPI_CMD_READ;
+	cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
+	cmd |= addr & WSPI_CMD_BYTE_ADDR;
+
+	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 = TNETWIF_READ_OFFSET_BYTES;
+	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 */
+
+	wl12xx_dump(DEBUG_SPI, "spi_read cmd -> ", &cmd, sizeof(cmd));
+	wl12xx_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
+}
+
+void wl12xx_spi_write(struct wl12xx *wl, int addr, void *buf,
+		      size_t len)
+{
+	struct spi_transfer t[2];
+	struct spi_message m;
+	u32 cmd;
+
+	cmd = 0;
+	cmd |= WSPI_CMD_WRITE;
+	cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
+	cmd |= addr & WSPI_CMD_BYTE_ADDR;
+
+	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);
+
+	wl12xx_dump(DEBUG_SPI, "spi_write cmd -> ", &cmd, sizeof(cmd));
+	wl12xx_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
+}
+
+void wl12xx_spi_mem_read(struct wl12xx *wl, int addr, void *buf,
+			 size_t len)
+{
+	int physical;
+
+	physical = wl12xx_translate_mem_addr(wl, addr);
+
+	wl12xx_spi_read(wl, physical, buf, len);
+}
+
+void wl12xx_spi_mem_write(struct wl12xx *wl, int addr, void *buf,
+			  size_t len)
+{
+	int physical;
+
+	physical = wl12xx_translate_mem_addr(wl, addr);
+
+	wl12xx_spi_write(wl, physical, buf, len);
+}
+
+u32 wl12xx_mem_read32(struct wl12xx *wl, int addr)
+{
+	return wl12xx_read32(wl, wl12xx_translate_mem_addr(wl, addr));
+}
+
+void wl12xx_mem_write32(struct wl12xx *wl, int addr, u32 val)
+{
+	wl12xx_write32(wl, wl12xx_translate_mem_addr(wl, addr), val);
+}
+
+u32 wl12xx_reg_read32(struct wl12xx *wl, int addr)
+{
+	return wl12xx_read32(wl, wl12xx_translate_reg_addr(wl, addr));
+}
+
+void wl12xx_reg_write32(struct wl12xx *wl, int addr, u32 val)
+{
+	wl12xx_write32(wl, wl12xx_translate_reg_addr(wl, addr), val);
+}