nvmem: rockchip-efuse: add support for rk3328-efuse

This adds the necessary data for handling eFuse on the rk3328.

Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt b/Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt
index a6ef46dd1283f7a560fabcf171a8c083f35c001f..265bdb7dc8aa524fc75383ee01512b2eabcf5dd0 100644 (file)
--- a/Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt
+++ b/Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt
@@ -6,6 +6,7 @@ Required properties:
   - "rockchip,rk3188-efuse" - for RK3188 SoCs.
   - "rockchip,rk3228-efuse" - for RK3228 SoCs.
   - "rockchip,rk3288-efuse" - for RK3288 SoCs.
+  - "rockchip,rk3328-efuse" - for RK3328 SoCs.
   - "rockchip,rk3368-efuse" - for RK3368 SoCs.
   - "rockchip,rk3399-efuse" - for RK3399 SoCs.
 - reg: Should contain the registers location and exact eFuse size

diff --git a/drivers/nvmem/rockchip-efuse.c b/drivers/nvmem/rockchip-efuse.c
index a91372816c0aa1aa92849dc59f2ca0f1be7e106c..f13a8335f3642d576a09cd73c7add3934f29cd8f 100644 (file)
--- a/drivers/nvmem/rockchip-efuse.c
+++ b/drivers/nvmem/rockchip-efuse.c
@@ -32,6 +32,14 @@
 #define RK3288_STROBE          BIT(1)
 #define RK3288_CSB             BIT(0)
 
+#define RK3328_SECURE_SIZES    96
+#define RK3328_INT_STATUS      0x0018
+#define RK3328_DOUT            0x0020
+#define RK3328_AUTO_CTRL       0x0024
+#define RK3328_INT_FINISH      BIT(0)
+#define RK3328_AUTO_ENB                BIT(0)
+#define RK3328_AUTO_RD         BIT(1)
+
 #define RK3399_A_SHIFT         16
 #define RK3399_A_MASK          0x3ff
 #define RK3399_NBYTES          4
@@ -92,6 +100,60 @@ static int rockchip_rk3288_efuse_read(void *context, unsigned int offset,
        return 0;
 }
 
+static int rockchip_rk3328_efuse_read(void *context, unsigned int offset,
+                                     void *val, size_t bytes)
+{
+       struct rockchip_efuse_chip *efuse = context;
+       unsigned int addr_start, addr_end, addr_offset, addr_len;
+       u32 out_value, status;
+       u8 *buf;
+       int ret, i = 0;
+
+       ret = clk_prepare_enable(efuse->clk);
+       if (ret < 0) {
+               dev_err(efuse->dev, "failed to prepare/enable efuse clk\n");
+               return ret;
+       }
+
+       /* 128 Byte efuse, 96 Byte for secure, 32 Byte for non-secure */
+       offset += RK3328_SECURE_SIZES;
+       addr_start = rounddown(offset, RK3399_NBYTES) / RK3399_NBYTES;
+       addr_end = roundup(offset + bytes, RK3399_NBYTES) / RK3399_NBYTES;
+       addr_offset = offset % RK3399_NBYTES;
+       addr_len = addr_end - addr_start;
+
+       buf = kzalloc(sizeof(*buf) * addr_len * RK3399_NBYTES, GFP_KERNEL);
+       if (!buf) {
+               ret = -ENOMEM;
+               goto nomem;
+       }
+
+       while (addr_len--) {
+               writel(RK3328_AUTO_RD | RK3328_AUTO_ENB |
+                      ((addr_start++ & RK3399_A_MASK) << RK3399_A_SHIFT),
+                      efuse->base + RK3328_AUTO_CTRL);
+               udelay(4);
+               status = readl(efuse->base + RK3328_INT_STATUS);
+               if (!(status & RK3328_INT_FINISH)) {
+                       ret = -EIO;
+                       goto err;
+               }
+               out_value = readl(efuse->base + RK3328_DOUT);
+               writel(RK3328_INT_FINISH, efuse->base + RK3328_INT_STATUS);
+
+               memcpy(&buf[i], &out_value, RK3399_NBYTES);
+               i += RK3399_NBYTES;
+       }
+
+       memcpy(val, buf + addr_offset, bytes);
+err:
+       kfree(buf);
+nomem:
+       clk_disable_unprepare(efuse->clk);
+
+       return ret;
+}
+
 static int rockchip_rk3399_efuse_read(void *context, unsigned int offset,
                                      void *val, size_t bytes)
 {
@@ -180,6 +242,10 @@ static const struct of_device_id rockchip_efuse_match[] = {
                .compatible = "rockchip,rk3368-efuse",
                .data = (void *)&rockchip_rk3288_efuse_read,
        },
+       {
+               .compatible = "rockchip,rk3328-efuse",
+               .data = (void *)&rockchip_rk3328_efuse_read,
+       },
        {
                .compatible = "rockchip,rk3399-efuse",
                .data = (void *)&rockchip_rk3399_efuse_read,