MIPS: ralink: Add support for mt7688

MT7688 is similar tot he MT7628 but has a different wifi radio.

Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11439/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 29 insertions, 6 deletions

diff --git a/arch/mips/ralink/mt7620.c b/arch/mips/ralink/mt7620.c
index 2ea5ff6dc22e..4d1a0339dd54 100644
--- a/arch/mips/ralink/mt7620.c
+++ b/arch/mips/ralink/mt7620.c
@@ -40,6 +40,12 @@
 /* is this a MT7620 or a MT7628 */
 enum mt762x_soc_type mt762x_soc;
 
+/* EFUSE bits */
+#define EFUSE_MT7688            0x100000
+
+/* DRAM type bit */
+#define DRAM_TYPE_MT7628_MASK   0x1
+
 /* does the board have sdram or ddram */
 static int dram_type;
 
@@ -227,6 +233,12 @@ static struct rt2880_pmx_group mt7628an_pinmux_data[] = {
         { 0 }
 };
 
+static inline int is_mt76x8(void)
+{
+        return mt762x_soc == MT762X_SOC_MT7628AN ||
+               mt762x_soc == MT762X_SOC_MT7688;
+}
+
 static __init u32
 mt7620_calc_rate(u32 ref_rate, u32 mul, u32 div)
 {
@@ -381,7 +393,7 @@ void __init ralink_clk_init(void)
 #define RINT(x)         ((x) / 1000000)
 #define RFRAC(x)        (((x) / 1000) % 1000)
 
-        if (mt762x_soc == MT762X_SOC_MT7628AN) {
+        if (is_mt76x8()) {
                 if (xtal_rate == MHZ(40))
                         cpu_rate = MHZ(580);
                 else
@@ -511,8 +523,15 @@ void prom_soc_init(struct ralink_soc_info *soc_info)
 #endif
                 }
         } else if (n0 == MT7620_CHIP_NAME0 && n1 == MT7628_CHIP_NAME1) {
-                mt762x_soc = MT762X_SOC_MT7628AN;
-                name = "MT7628AN";
+                u32 efuse = __raw_readl(sysc + SYSC_REG_EFUSE_CFG);
+
+                if (efuse & EFUSE_MT7688) {
+                        mt762x_soc = MT762X_SOC_MT7688;
+                        name = "MT7688";
+                } else {
+                        mt762x_soc = MT762X_SOC_MT7628AN;
+                        name = "MT7628AN";
+                }
                 soc_info->compatible = "ralink,mt7628an-soc";
         } else {
                 panic("mt762x: unknown SoC, n0:%08x n1:%08x\n", n0, n1);
@@ -525,10 +544,14 @@ void prom_soc_init(struct ralink_soc_info *soc_info)
                 (rev & CHIP_REV_ECO_MASK));
 
         cfg0 = __raw_readl(sysc + SYSC_REG_SYSTEM_CONFIG0);
-        dram_type = (cfg0 >> SYSCFG0_DRAM_TYPE_SHIFT) & SYSCFG0_DRAM_TYPE_MASK;
+        if (is_mt76x8())
+                dram_type = cfg0 & DRAM_TYPE_MT7628_MASK;
+        else
+                dram_type = (cfg0 >> SYSCFG0_DRAM_TYPE_SHIFT) &
+                            SYSCFG0_DRAM_TYPE_MASK;
 
         soc_info->mem_base = MT7620_DRAM_BASE;
-        if (mt762x_soc == MT762X_SOC_MT7628AN)
+        if (is_mt76x8())
                 mt7628_dram_init(soc_info);
         else
                 mt7620_dram_init(soc_info);
@@ -541,7 +564,7 @@ void prom_soc_init(struct ralink_soc_info *soc_info)
         pr_info("Digital PMU set to %s control\n",
                 (pmu1 & DIG_SW_SEL) ? ("sw") : ("hw"));
 
-        if (mt762x_soc == MT762X_SOC_MT7628AN)
+        if (is_mt76x8())
                 rt2880_pinmux_data = mt7628an_pinmux_data;
         else
                 rt2880_pinmux_data = mt7620a_pinmux_data;