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nvmem: rockchip-efuse: clear efuse timing after read

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Clear efuse timing after read to avoid efuse misoperation.

Change-Id: I459d01af9c9a84ab6c621e5e5cf3f01213b4f7f9
Signed-off-by: Liang Chen <cl@rock-chips.com>
This commit is contained in:
Liang Chen
2019-08-08 14:49:53 +08:00
committed by Finley Xiao
parent e8b8a27f7e
commit cb4ecc7dc3
1 changed files with 22 additions and 8 deletions
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30
drivers/nvmem/rockchip-efuse.c
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@@ -103,11 +103,6 @@ struct rockchip_efuse_chip {
static void rk1808_efuse_timing_init(void __iomem *base)
{
static bool init;
if (init)
return;
/* enable auto mode */
writel(readl(base + RK1808_MOD) & (~RK1808_USER_MODE),
base + RK1808_MOD);
@@ -123,8 +118,25 @@ static void rk1808_efuse_timing_init(void __iomem *base)
writel((T_LOAD_R_S << 16) | T_LOAD_R_L, base + T_LOAD_R);
writel((T_ADDR_R_S << 16) | T_ADDR_R_L, base + T_ADDR_R);
writel((T_STROBE_R_S << 16) | T_STROBE_R_L, base + T_STROBE_R);
}
init = true;
static void rk1808_efuse_timing_deinit(void __iomem *base)
{
/* disable auto mode */
writel(readl(base + RK1808_MOD) | RK1808_USER_MODE,
base + RK1808_MOD);
/* clear efuse timing */
writel(0, base + T_CSB_P);
writel(0, base + T_PGENB_P);
writel(0, base + T_LOAD_P);
writel(0, base + T_ADDR_P);
writel(0, base + T_STROBE_P);
writel(0, base + T_CSB_R);
writel(0, base + T_PGENB_R);
writel(0, base + T_LOAD_R);
writel(0, base + T_ADDR_R);
writel(0, base + T_STROBE_R);
}
static int rockchip_rk1808_efuse_read(void *context, unsigned int offset,
@@ -149,8 +161,6 @@ static int rockchip_rk1808_efuse_read(void *context, unsigned int offset,
return ret;
}
rk1808_efuse_timing_init(efuse->base);
addr_start = rounddown(offset, RK1808_NBYTES) / RK1808_NBYTES;
addr_end = roundup(offset + bytes, RK1808_NBYTES) / RK1808_NBYTES;
addr_offset = offset % RK1808_NBYTES;
@@ -162,6 +172,8 @@ static int rockchip_rk1808_efuse_read(void *context, unsigned int offset,
goto nomem;
}
rk1808_efuse_timing_init(efuse->base);
while (addr_len--) {
writel(RK1808_AUTO_RD | RK1808_AUTO_ENB |
((addr_start++ & RK1808_A_MASK) << RK1808_A_SHIFT),
@@ -180,8 +192,10 @@ static int rockchip_rk1808_efuse_read(void *context, unsigned int offset,
}
memcpy(val, buf + addr_offset, bytes);
err:
rk1808_efuse_timing_deinit(efuse->base);
kfree(buf);
nomem:
rk1808_efuse_timing_deinit(efuse->base);
clk_disable_unprepare(efuse->clk);
clk_disable_unprepare(efuse->sclk);