nvmem: rockchip-efuse: add rk3368-efuse support

This adds the necessary data for handling efuse on the rk3368.
As efuse of rk3368 is secure, use secure interface to access efuse.

Change-Id: I72c29348b7744b232d75ab51c56dc7de0988c24e
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>

diff --git a/Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt b/Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt
index fba905b32aac2d0024ac982bf4b580053bd518e7..36ee06eb8469241e71232e8fca7f7c160afd9bcb 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,rk3288-efuse" - for RK3288 SoCs.
   - "rockchip,rk3366-efuse" - for RK3366 SoCs.
+  - "rockchip,rk3368-efuse" - for RK3368 SoCs.
   - "rockchip,rk3399-efuse" - for RK3399 SoCs.
 - reg: Should contain the registers location and exact eFuse size
 - clocks: Should be the clock id of eFuse

diff --git a/drivers/nvmem/rockchip-efuse.c b/drivers/nvmem/rockchip-efuse.c
index 0995634ba1bac092bc1e3cd448f3418832cf8e6a..986734aef252060b9bf931b81653ab40d6e99b71 100644 (file)
--- a/drivers/nvmem/rockchip-efuse.c
+++ b/drivers/nvmem/rockchip-efuse.c
@@ -24,6 +24,7 @@
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
+#include <linux/rockchip/rockchip_sip.h>
 
 #define RK3288_A_SHIFT         6
 #define RK3288_A_MASK          0x3ff
@@ -55,6 +56,7 @@ struct rockchip_efuse_chip {
        struct device *dev;
        void __iomem *base;
        struct clk *clk;
+       phys_addr_t phys;
 };
 
 static int rockchip_rk3288_efuse_read(void *context, unsigned int offset,
@@ -137,6 +139,51 @@ static int rockchip_rk3366_efuse_read(void *context, unsigned int offset,
        return 0;
 }
 
+static int rockchip_rk3368_efuse_read(void *context, unsigned int offset,
+                                     void *val, size_t bytes)
+{
+       struct rockchip_efuse_chip *efuse = context;
+       u8 *buf = val;
+       u32 wr_val;
+       int ret;
+
+       ret = clk_prepare_enable(efuse->clk);
+       if (ret < 0) {
+               dev_err(efuse->dev, "failed to prepare/enable efuse clk\n");
+               return ret;
+       }
+
+       sip_smc_secure_reg_write(efuse->phys + REG_EFUSE_CTRL,
+                                RK3288_LOAD | RK3288_PGENB);
+       udelay(1);
+       while (bytes--) {
+               wr_val = sip_smc_secure_reg_read(efuse->phys + REG_EFUSE_CTRL) &
+                        (~(RK3288_A_MASK << RK3288_A_SHIFT));
+               sip_smc_secure_reg_write(efuse->phys + REG_EFUSE_CTRL, wr_val);
+               wr_val = sip_smc_secure_reg_read(efuse->phys + REG_EFUSE_CTRL) |
+                        ((offset++ & RK3288_A_MASK) << RK3288_A_SHIFT);
+               sip_smc_secure_reg_write(efuse->phys + REG_EFUSE_CTRL, wr_val);
+               udelay(1);
+               wr_val = sip_smc_secure_reg_read(efuse->phys + REG_EFUSE_CTRL) |
+                        RK3288_STROBE;
+               sip_smc_secure_reg_write(efuse->phys + REG_EFUSE_CTRL, wr_val);
+               udelay(1);
+               *buf++ = sip_smc_secure_reg_read(efuse->phys + REG_EFUSE_DOUT);
+               wr_val = sip_smc_secure_reg_read(efuse->phys + REG_EFUSE_CTRL) &
+                        (~RK3288_STROBE);
+               sip_smc_secure_reg_write(efuse->phys + REG_EFUSE_CTRL, wr_val);
+               udelay(1);
+       }
+
+       /* Switch to standby mode */
+       sip_smc_secure_reg_write(efuse->phys + REG_EFUSE_CTRL,
+                                RK3288_PGENB | RK3288_CSB);
+
+       clk_disable_unprepare(efuse->clk);
+
+       return 0;
+}
+
 static int rockchip_rk3399_efuse_read(void *context, unsigned int offset,
                                      void *val, size_t bytes)
 {
@@ -222,6 +269,10 @@ static const struct of_device_id rockchip_efuse_match[] = {
                .compatible = "rockchip,rk3366-efuse",
                .data = (void *)&rockchip_rk3366_efuse_read,
        },
+       {
+               .compatible = "rockchip,rk3368-efuse",
+               .data = (void *)&rockchip_rk3368_efuse_read,
+       },
        {
                .compatible = "rockchip,rk3399-efuse",
                .data = (void *)&rockchip_rk3399_efuse_read,
@@ -250,6 +301,7 @@ static int __init rockchip_efuse_probe(struct platform_device *pdev)
                return -ENOMEM;
 
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       efuse->phys = res->start;
        efuse->base = devm_ioremap_resource(&pdev->dev, res);
        if (IS_ERR(efuse->base))
                return PTR_ERR(efuse->base);