openwrt/target/linux/ar71xx/patches-4.4/523-MIPS-ath79-OTP-support.patch

--- a/arch/mips/ath79/dev-wmac.c
+++ b/arch/mips/ath79/dev-wmac.c
@@ -167,6 +167,137 @@ static void qca955x_wmac_setup(void)
 		ath79_wmac_data.is_clk_25mhz = true;
 }
 
+static bool __init
+ar93xx_wmac_otp_read_word(void __iomem *base, int addr, u32 *data)
+{
+	int timeout = 1000;
+	u32 val;
+
+	__raw_readl(base + AR9300_OTP_BASE + (4 * addr));
+	while (timeout--) {
+		val = __raw_readl(base + AR9300_OTP_STATUS);
+		if ((val & AR9300_OTP_STATUS_TYPE) == AR9300_OTP_STATUS_VALID)
+			break;
+
+		udelay(10);
+	}
+
+	if (!timeout)
+		return false;
+
+	*data = __raw_readl(base + AR9300_OTP_READ_DATA);
+	return true;
+}
+
+static bool __init
+ar93xx_wmac_otp_read(void __iomem *base, int addr, u8 *dest, int len)
+{
+	u32 data;
+	int i;
+
+	for (i = 0; i < len; i++) {
+		int offset = 8 * ((addr - i) % 4);
+
+		if (!ar93xx_wmac_otp_read_word(base, (addr - i) / 4, &data))
+			return false;
+
+		dest[i] = (data >> offset) & 0xff;
+	}
+
+	return true;
+}
+
+static bool __init
+ar93xx_wmac_otp_uncompress(void __iomem *base, int addr, int len, u8 *dest,
+			   int dest_start, int dest_len)
+{
+	int dest_bytes = 0;
+	int offset = 0;
+	int end = addr - len;
+	u8 hdr[2];
+
+	while (addr > end) {
+		if (!ar93xx_wmac_otp_read(base, addr, hdr, 2))
+			return false;
+
+		addr -= 2;
+		offset += hdr[0];
+
+		if (offset <= dest_start + dest_len &&
+		    offset + len >= dest_start) {
+			int data_offset = 0;
+			int dest_offset = 0;
+			int copy_len;
+
+			if (offset < dest_start)
+				data_offset = dest_start - offset;
+			else
+				dest_offset = offset - dest_start;
+
+			copy_len = len - data_offset;
+			if (copy_len > dest_len - dest_offset)
+				copy_len = dest_len - dest_offset;
+
+			ar93xx_wmac_otp_read(base, addr - data_offset,
+					     dest + dest_offset,
+					     copy_len);
+
+			dest_bytes += copy_len;
+		}
+		addr -= hdr[1];
+	}
+	return !!dest_bytes;
+}
+
+bool __init ar93xx_wmac_read_mac_address(u8 *dest)
+{
+	void __iomem *base;
+	bool ret = false;
+	int addr = 0x1ff;
+	unsigned int len;
+	u32 hdr_u32;
+	u8 *hdr = (u8 *) &hdr_u32;
+	u8 mac[6] = { 0x00, 0x02, 0x03, 0x04, 0x05, 0x06 };
+	int mac_start = 2, mac_end = 8;
+
+	BUG_ON(!soc_is_ar933x() && !soc_is_ar934x());
+	base = ioremap_nocache(AR933X_WMAC_BASE, AR933X_WMAC_SIZE);
+	while (addr > sizeof(hdr)) {
+		if (!ar93xx_wmac_otp_read(base, addr, hdr, sizeof(hdr)))
+			break;
+
+		if (hdr_u32 == 0 || hdr_u32 == ~0)
+			break;
+
+		len = (hdr[1] << 4) | (hdr[2] >> 4);
+		addr -= 4;
+
+		switch (hdr[0] >> 5) {
+		case 0:
+			if (len < mac_end)
+				break;
+
+			ar93xx_wmac_otp_read(base, addr - mac_start, mac, 6);
+			ret = true;
+			break;
+		case 3:
+			ret |= ar93xx_wmac_otp_uncompress(base, addr, len, mac,
+							  mac_start, 6);
+			break;
+		default:
+			break;
+		}
+
+		addr -= len + 2;
+	}
+
+	iounmap(base);
+	if (ret)
+		memcpy(dest, mac, 6);
+
+	return ret;
+}
+
 void __init ath79_register_wmac(u8 *cal_data, u8 *mac_addr)
 {
 	if (soc_is_ar913x())
--- a/arch/mips/ath79/dev-wmac.h
+++ b/arch/mips/ath79/dev-wmac.h
@@ -14,5 +14,6 @@
 
 void ath79_register_wmac(u8 *cal_data, u8 *mac_addr);
 void ath79_register_wmac_simple(void);
+bool ar93xx_wmac_read_mac_address(u8 *dest);
 
 #endif /* _ATH79_DEV_WMAC_H */
--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
@@ -112,6 +112,14 @@
 #define QCA955X_EHCI1_BASE	0x1b400000
 #define QCA955X_EHCI_SIZE	0x1000
 
+#define AR9300_OTP_BASE		0x14000
+#define AR9300_OTP_STATUS	0x15f18
+#define AR9300_OTP_STATUS_TYPE		0x7
+#define AR9300_OTP_STATUS_VALID		0x4
+#define AR9300_OTP_STATUS_ACCESS_BUSY	0x2
+#define AR9300_OTP_STATUS_SM_BUSY	0x1
+#define AR9300_OTP_READ_DATA	0x15f1c
+
 /*
  * DDR_CTRL block
  */