wl1251: add NVS in EEPROM support

wl1251 supports also that NVS is stored in a separate EEPROM, add support
for that.

kvalo: use platform data instead Kconfig and use kernel style
Signed-off-by: NDavid-John Willis <John.Willis@Distant-earth.com>
Signed-off-by: NKalle Valo <kalle.valo@nokia.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1251.h

@@ -269,6 +269,7 @@ struct wl1251 {
 
 	void (*set_power)(bool enable);
 	int irq;
+	bool use_eeprom;
 
 	enum wl1251_state state;
 	struct mutex mutex;

drivers/net/wireless/wl12xx/wl1251_boot.c

@@ -494,13 +494,19 @@ int wl1251_boot(struct wl1251 *wl)
 		goto out;
 
 	/* 2. start processing NVS file */
-	ret = wl1251_boot_upload_nvs(wl);
-	if (ret < 0)
-		goto out;
-
-	/* write firmware's last address (ie. it's length) to
-	 * ACX_EEPROMLESS_IND_REG */
-	wl1251_reg_write32(wl, ACX_EEPROMLESS_IND_REG, wl->fw_len);
+	if (wl->use_eeprom) {
+		wl1251_reg_write32(wl, ACX_REG_EE_START, START_EEPROM_MGR);
+		msleep(4000);
+		wl1251_reg_write32(wl, ACX_EEPROMLESS_IND_REG, USE_EEPROM);
+	} else {
+		ret = wl1251_boot_upload_nvs(wl);
+		if (ret < 0)
+			goto out;
+
+		/* write firmware's last address (ie. it's length) to
+		 * ACX_EEPROMLESS_IND_REG */
+		wl1251_reg_write32(wl, ACX_EEPROMLESS_IND_REG, wl->fw_len);
+	}
 
 	/* 6. read the EEPROM parameters */
 	tmp = wl1251_reg_read32(wl, SCR_PAD2);

drivers/net/wireless/wl12xx/wl1251_reg.h

@@ -370,6 +370,7 @@ enum wl12xx_acx_int_reg {
  EEPROM location specified in the EE_ADDR register.
  The Wlan hardware hardware clears this bit automatically.
 *===============================================*/
+#define EE_CTL                              (REGISTERS_BASE + 0x2000)
 #define ACX_EE_CTL_REG                      EE_CTL
 #define EE_WRITE                            0x00000001ul
 #define EE_READ                             0x00000002ul
@@ -380,6 +381,7 @@ enum wl12xx_acx_int_reg {
   This register specifies the address
   within the EEPROM from/to which to read/write data.
   ===============================================*/
+#define EE_ADDR                             (REGISTERS_BASE + 0x2008)
 #define ACX_EE_ADDR_REG                     EE_ADDR
 
 /*===============================================
@@ -389,8 +391,12 @@ enum wl12xx_acx_int_reg {
   data from the EEPROM or the write data
   to be written to the EEPROM.
   ===============================================*/
+#define EE_DATA                             (REGISTERS_BASE + 0x2004)
 #define ACX_EE_DATA_REG                     EE_DATA
 
+#define EEPROM_ACCESS_TO                    10000   /* timeout counter */
+#define START_EEPROM_MGR                    0x00000001
+
 /*===============================================
   EEPROM Base Address  - 32bit RW
   ------------------------------------------

drivers/net/wireless/wl12xx/wl1251_spi.c

@@ -270,6 +270,8 @@ static int __devinit wl1251_spi_probe(struct spi_device *spi)
 		return -ENODEV;
 	}
 
+	wl->use_eeprom = pdata->use_eeprom;
+
 	ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl);
 	if (ret < 0) {
 		wl1251_error("request_irq() failed: %d", ret);

include/linux/spi/wl12xx.h

@@ -26,6 +26,7 @@
 
 struct wl12xx_platform_data {
 	void (*set_power)(bool enable);
+	bool use_eeprom;
 };
 
 #endif