[PATCH v4 2/6] cpufreq: sun50i: add a100 cpufreq support

[Shuosheng Huang]

Add cpufreq nvmem based for allwinner a100 SoC, it's similar to h6.

Signed-off-by: Shuosheng Huang <huangshuosheng@xxxxxxxxxxxxxxxxx>
---
 drivers/cpufreq/cpufreq-dt-platdev.c   |  1 +
 drivers/cpufreq/sun50i-cpufreq-nvmem.c | 32 ++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
index 3776d960f405..2ebf5d9cb616 100644
--- a/drivers/cpufreq/cpufreq-dt-platdev.c
+++ b/drivers/cpufreq/cpufreq-dt-platdev.c
@@ -102,6 +102,7 @@ static const struct of_device_id whitelist[] __initconst = {
  */
 static const struct of_device_id blacklist[] __initconst = {
 	{ .compatible = "allwinner,sun50i-h6", },
+	{ .compatible = "allwinner,sun50i-a100", },
 
 	{ .compatible = "calxeda,highbank", },
 	{ .compatible = "calxeda,ecx-2000", },
diff --git a/drivers/cpufreq/sun50i-cpufreq-nvmem.c b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
index 3c0531938d1a..aead98164373 100644
--- a/drivers/cpufreq/sun50i-cpufreq-nvmem.c
+++ b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
@@ -22,6 +22,9 @@
 #define SUN50I_H6_NVMEM_MASK		0x7
 #define SUN50I_H6_NVMEM_SHIFT		5
 
+#define SUN50I_A100_NVMEM_MASK		0xf
+#define SUN50I_A100_NVMEM_SHIFT		12
+
 struct sunxi_cpufreq_soc_data {
 	int (*efuse_xlate)(struct nvmem_cell *speedbin_nvmem);
 };
@@ -52,6 +55,30 @@ static int sun50i_h6_efuse_xlate(struct nvmem_cell *speedbin_nvmem)
 		return 0;
 }
 
+static int sun50i_a100_efuse_xlate(struct nvmem_cell *speedbin_nvmem)
+{
+	size_t len;
+	u32 *speedbin;
+	u32 efuse_value;
+
+	speedbin = nvmem_cell_read(speedbin_nvmem, &len);
+	if (IS_ERR(speedbin))
+		return PTR_ERR(speedbin);
+
+	efuse_value = (*(u16 *)efuse >> SUN50I_A100_NVMEM_SHIFT) &
+			  SUN50I_A100_NVMEM_MASK;
+	kfree(speedbin);
+
+	switch (efuse_value) {
+	case 0b100:
+		return 2;
+	case 0b010:
+		return 1;
+	default:
+		return 0;
+	}
+}
+
 /**
  * sun50i_cpufreq_get_efuse() - Determine speed grade from efuse value
  * @soc_data: pointer to sunxi_cpufreq_soc_data context
@@ -184,8 +211,13 @@ static const struct sunxi_cpufreq_soc_data sun50i_h6_data = {
 	.efuse_xlate = sun50i_h6_efuse_xlate,
 };
 
+static const struct sunxi_cpufreq_soc_data sun50i_a100_data = {
+	.efuse_xlate = sun50i_a100_efuse_xlate,
+};
+
 static const struct of_device_id sun50i_cpufreq_match_list[] = {
 	{ .compatible = "allwinner,sun50i-h6", .data = &sun50i_h6_data },
+	{ .compatible = "allwinner,sun50i-a100", .data = &sun50i_a100_data },
 	{}
 };
 
-- 
2.28.0