diff options
Diffstat (limited to 'drivers/rng/stm32mp1_rng.c')
| -rw-r--r-- | drivers/rng/stm32mp1_rng.c | 61 |
1 files changed, 47 insertions, 14 deletions
diff --git a/drivers/rng/stm32mp1_rng.c b/drivers/rng/stm32mp1_rng.c index 8ea00e3e89..89da78c6c8 100644 --- a/drivers/rng/stm32mp1_rng.c +++ b/drivers/rng/stm32mp1_rng.c @@ -18,22 +18,28 @@ #include <linux/iopoll.h> #include <linux/kernel.h> -#define RNG_CR 0x00 -#define RNG_CR_RNGEN BIT(2) -#define RNG_CR_CED BIT(5) +#define RNG_CR 0x00 +#define RNG_CR_RNGEN BIT(2) +#define RNG_CR_CED BIT(5) +#define RNG_CR_CONDRST BIT(30) -#define RNG_SR 0x04 -#define RNG_SR_SEIS BIT(6) -#define RNG_SR_CEIS BIT(5) -#define RNG_SR_SECS BIT(2) -#define RNG_SR_DRDY BIT(0) +#define RNG_SR 0x04 +#define RNG_SR_SEIS BIT(6) +#define RNG_SR_CEIS BIT(5) +#define RNG_SR_SECS BIT(2) +#define RNG_SR_DRDY BIT(0) -#define RNG_DR 0x08 +#define RNG_DR 0x08 + +struct stm32_rng_data { + bool has_cond_reset; +}; struct stm32_rng_plat { fdt_addr_t base; struct clk clk; struct reset_ctl rst; + const struct stm32_rng_data *data; }; static int stm32_rng_read(struct udevice *dev, void *data, size_t len) @@ -83,18 +89,36 @@ static int stm32_rng_read(struct udevice *dev, void *data, size_t len) static int stm32_rng_init(struct stm32_rng_plat *pdata) { int err; + u32 cr, sr; err = clk_enable(&pdata->clk); if (err) return err; + cr = readl(pdata->base + RNG_CR); + /* Disable CED */ - writel(RNG_CR_RNGEN | RNG_CR_CED, pdata->base + RNG_CR); + cr |= RNG_CR_CED; + if (pdata->data->has_cond_reset) { + cr |= RNG_CR_CONDRST; + writel(cr, pdata->base + RNG_CR); + cr &= ~RNG_CR_CONDRST; + writel(cr, pdata->base + RNG_CR); + err = readl_poll_timeout(pdata->base + RNG_CR, cr, + (!(cr & RNG_CR_CONDRST)), 10000); + if (err) + return err; + } /* clear error indicators */ writel(0, pdata->base + RNG_SR); - return 0; + cr |= RNG_CR_RNGEN; + writel(cr, pdata->base + RNG_CR); + + err = readl_poll_timeout(pdata->base + RNG_SR, sr, + sr & RNG_SR_DRDY, 10000); + return err; } static int stm32_rng_cleanup(struct stm32_rng_plat *pdata) @@ -108,6 +132,8 @@ static int stm32_rng_probe(struct udevice *dev) { struct stm32_rng_plat *pdata = dev_get_plat(dev); + pdata->data = (struct stm32_rng_data *)dev_get_driver_data(dev); + reset_assert(&pdata->rst); udelay(20); reset_deassert(&pdata->rst); @@ -146,10 +172,17 @@ static const struct dm_rng_ops stm32_rng_ops = { .read = stm32_rng_read, }; +static const struct stm32_rng_data stm32mp13_rng_data = { + .has_cond_reset = true, +}; + +static const struct stm32_rng_data stm32_rng_data = { + .has_cond_reset = false, +}; + static const struct udevice_id stm32_rng_match[] = { - { - .compatible = "st,stm32-rng", - }, + {.compatible = "st,stm32mp13-rng", .data = (ulong)&stm32mp13_rng_data}, + {.compatible = "st,stm32-rng", .data = (ulong)&stm32_rng_data}, {}, }; |