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ar71xx: add support for reading the MAC address from OTP ROM on AR933x

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SVN-Revision: 32446
This commit is contained in:
Felix Fietkau 2012-06-19 00:21:58 +00:00
parent 231f5ebb28
commit 5d364d0ca1
1 changed files with 166 additions and 0 deletions
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166
target/linux/ar71xx/patches-3.3/620-MIPS-ath79-OTP-support.patch Normal file
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@ -0,0 +1,166 @@
--- a/arch/mips/ath79/dev-wmac.c
+++ b/arch/mips/ath79/dev-wmac.c
@@ -121,6 +121,137 @@ static void ar934x_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
@@ -13,5 +13,6 @@
#define _ATH79_DEV_WMAC_H
void ath79_register_wmac(u8 *cal_data, u8 *mac_addr);
+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
@@ -78,6 +78,14 @@
#define AR934X_EHCI_BASE 0x1b000000
#define AR934X_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
*/