diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/nvmem/rockchip-efuse.c | 133 |
1 files changed, 114 insertions, 19 deletions
diff --git a/drivers/nvmem/rockchip-efuse.c b/drivers/nvmem/rockchip-efuse.c index 4d3f391f0a0b..423907bdd259 100644 --- a/drivers/nvmem/rockchip-efuse.c +++ b/drivers/nvmem/rockchip-efuse.c @@ -22,17 +22,29 @@ #include <linux/nvmem-provider.h> #include <linux/slab.h> #include <linux/of.h> +#include <linux/of_platform.h> #include <linux/platform_device.h> -#define EFUSE_A_SHIFT 6 -#define EFUSE_A_MASK 0x3ff -#define EFUSE_PGENB BIT(3) -#define EFUSE_LOAD BIT(2) -#define EFUSE_STROBE BIT(1) -#define EFUSE_CSB BIT(0) - -#define REG_EFUSE_CTRL 0x0000 -#define REG_EFUSE_DOUT 0x0004 +#define RK3288_A_SHIFT 6 +#define RK3288_A_MASK 0x3ff +#define RK3288_PGENB BIT(3) +#define RK3288_LOAD BIT(2) +#define RK3288_STROBE BIT(1) +#define RK3288_CSB BIT(0) + +#define RK3399_A_SHIFT 16 +#define RK3399_A_MASK 0x3ff +#define RK3399_NBYTES 4 +#define RK3399_STROBSFTSEL BIT(9) +#define RK3399_RSB BIT(7) +#define RK3399_PD BIT(5) +#define RK3399_PGENB BIT(3) +#define RK3399_LOAD BIT(2) +#define RK3399_STROBE BIT(1) +#define RK3399_CSB BIT(0) + +#define REG_EFUSE_CTRL 0x0000 +#define REG_EFUSE_DOUT 0x0004 struct rockchip_efuse_chip { struct device *dev; @@ -40,8 +52,8 @@ struct rockchip_efuse_chip { struct clk *clk; }; -static int rockchip_efuse_read(void *context, unsigned int offset, - void *val, size_t bytes) +static int rockchip_rk3288_efuse_read(void *context, unsigned int offset, + void *val, size_t bytes) { struct rockchip_efuse_chip *efuse = context; u8 *buf = val; @@ -53,27 +65,82 @@ static int rockchip_efuse_read(void *context, unsigned int offset, return ret; } - writel(EFUSE_LOAD | EFUSE_PGENB, efuse->base + REG_EFUSE_CTRL); + writel(RK3288_LOAD | RK3288_PGENB, efuse->base + REG_EFUSE_CTRL); udelay(1); while (bytes--) { writel(readl(efuse->base + REG_EFUSE_CTRL) & - (~(EFUSE_A_MASK << EFUSE_A_SHIFT)), + (~(RK3288_A_MASK << RK3288_A_SHIFT)), efuse->base + REG_EFUSE_CTRL); writel(readl(efuse->base + REG_EFUSE_CTRL) | - ((offset++ & EFUSE_A_MASK) << EFUSE_A_SHIFT), + ((offset++ & RK3288_A_MASK) << RK3288_A_SHIFT), efuse->base + REG_EFUSE_CTRL); udelay(1); writel(readl(efuse->base + REG_EFUSE_CTRL) | - EFUSE_STROBE, efuse->base + REG_EFUSE_CTRL); + RK3288_STROBE, efuse->base + REG_EFUSE_CTRL); udelay(1); *buf++ = readb(efuse->base + REG_EFUSE_DOUT); writel(readl(efuse->base + REG_EFUSE_CTRL) & - (~EFUSE_STROBE), efuse->base + REG_EFUSE_CTRL); + (~RK3288_STROBE), efuse->base + REG_EFUSE_CTRL); + udelay(1); + } + + /* Switch to standby mode */ + writel(RK3288_PGENB | RK3288_CSB, efuse->base + REG_EFUSE_CTRL); + + clk_disable_unprepare(efuse->clk); + + return 0; +} + +static int rockchip_rk3399_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; + 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; + } + + 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) { + clk_disable_unprepare(efuse->clk); + return -ENOMEM; + } + + writel(RK3399_LOAD | RK3399_PGENB | RK3399_STROBSFTSEL | RK3399_RSB, + efuse->base + REG_EFUSE_CTRL); + udelay(1); + while (addr_len--) { + writel(readl(efuse->base + REG_EFUSE_CTRL) | RK3399_STROBE | + ((addr_start++ & RK3399_A_MASK) << RK3399_A_SHIFT), + efuse->base + REG_EFUSE_CTRL); udelay(1); + out_value = readl(efuse->base + REG_EFUSE_DOUT); + writel(readl(efuse->base + REG_EFUSE_CTRL) & (~RK3399_STROBE), + efuse->base + REG_EFUSE_CTRL); + udelay(1); + + memcpy(&buf[i], &out_value, RK3399_NBYTES); + i += RK3399_NBYTES; } /* Switch to standby mode */ - writel(EFUSE_PGENB | EFUSE_CSB, efuse->base + REG_EFUSE_CTRL); + writel(RK3399_PD | RK3399_CSB, efuse->base + REG_EFUSE_CTRL); + + memcpy(val, buf + addr_offset, bytes); + + kfree(buf); clk_disable_unprepare(efuse->clk); @@ -89,7 +156,27 @@ static struct nvmem_config econfig = { }; static const struct of_device_id rockchip_efuse_match[] = { - { .compatible = "rockchip,rockchip-efuse", }, + /* deprecated but kept around for dts binding compatibility */ + { + .compatible = "rockchip,rockchip-efuse", + .data = (void *)&rockchip_rk3288_efuse_read, + }, + { + .compatible = "rockchip,rk3066a-efuse", + .data = (void *)&rockchip_rk3288_efuse_read, + }, + { + .compatible = "rockchip,rk3188-efuse", + .data = (void *)&rockchip_rk3288_efuse_read, + }, + { + .compatible = "rockchip,rk3288-efuse", + .data = (void *)&rockchip_rk3288_efuse_read, + }, + { + .compatible = "rockchip,rk3399-efuse", + .data = (void *)&rockchip_rk3399_efuse_read, + }, { /* sentinel */}, }; MODULE_DEVICE_TABLE(of, rockchip_efuse_match); @@ -99,6 +186,14 @@ static int rockchip_efuse_probe(struct platform_device *pdev) struct resource *res; struct nvmem_device *nvmem; struct rockchip_efuse_chip *efuse; + const struct of_device_id *match; + struct device *dev = &pdev->dev; + + match = of_match_device(dev->driver->of_match_table, dev); + if (!match || !match->data) { + dev_err(dev, "failed to get match data\n"); + return -EINVAL; + } efuse = devm_kzalloc(&pdev->dev, sizeof(struct rockchip_efuse_chip), GFP_KERNEL); @@ -116,7 +211,7 @@ static int rockchip_efuse_probe(struct platform_device *pdev) efuse->dev = &pdev->dev; econfig.size = resource_size(res); - econfig.reg_read = rockchip_efuse_read; + econfig.reg_read = match->data; econfig.priv = efuse; econfig.dev = efuse->dev; nvmem = nvmem_register(&econfig); |