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hwrng: rockchip: add RK_RNG support

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Use "rockchip,rkrng" as compatible.

Change-Id: I261f4da9d100eb3a693bf4cf65117422773e8a8c
Signed-off-by: Lin Jinhan <troy.lin@rock-chips.com>
This commit is contained in:
Lin Jinhan
2022-11-04 10:26:57 +08:00
parent fa61a34f45
commit e0cfc605b3
1 changed files with 97 additions and 23 deletions
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drivers/char/hw_random/rockchip-rng.c
+97 -23
View File
@@ -87,6 +87,27 @@
#define TRNG_v1_VERSION_CODE 0x46bc
/* end of TRNG_V1 register define */
/* start of RKRNG register define */
#define RKRNG_CTRL 0x0010
#define RKRNG_CTRL_INST_REQ BIT(0)
#define RKRNG_CTRL_RESEED_REQ BIT(1)
#define RKRNG_CTRL_TEST_REQ BIT(2)
#define RKRNG_CTRL_SW_DRNG_REQ BIT(3)
#define RKRNG_CTRL_SW_TRNG_REQ BIT(4)
#define RKRNG_STATE 0x0014
#define RKRNG_STATE_INST_ACK BIT(0)
#define RKRNG_STATE_RESEED_ACK BIT(1)
#define RKRNG_STATE_TEST_ACK BIT(2)
#define RKRNG_STATE_SW_DRNG_ACK BIT(3)
#define RKRNG_STATE_SW_TRNG_ACK BIT(4)
/* DRNG_DATA_0 ~ DNG_DATA_7 */
#define RKRNG_DRNG_DATA_0 0x0070
#define RKRNG_DRNG_DATA_7 0x008C
/* end of RKRNG register define */
struct rk_rng_soc_data {
u32 default_offset;
@@ -178,7 +199,7 @@ static void rk_rng_read_regs(struct rk_rng *rng, u32 offset, void *buf,
*(u32 *)(buf + i) = be32_to_cpu(rk_rng_readl(rng, offset + i));
}
static int rk_crypto_v1_read(struct hwrng *rng, void *buf, size_t max, bool wait)
static int crypto_v1_read(struct hwrng *rng, void *buf, size_t max, bool wait)
{
int ret = 0;
u32 reg_ctrl = 0;
@@ -213,7 +234,7 @@ out:
return ret;
}
static int rk_crypto_v2_read(struct hwrng *rng, void *buf, size_t max, bool wait)
static int crypto_v2_read(struct hwrng *rng, void *buf, size_t max, bool wait)
{
int ret = 0;
u32 reg_ctrl = 0;
@@ -249,19 +270,13 @@ out:
return ret;
}
static int rk_trng_v1_init(struct hwrng *rng)
static int trng_v1_init(struct hwrng *rng)
{
int ret;
uint32_t auto_reseed_cnt = 1000;
uint32_t reg_ctrl, status, version;
struct rk_rng *rk_rng = container_of(rng, struct rk_rng, rng);
ret = pm_runtime_get_sync(rk_rng->dev);
if (ret < 0) {
pm_runtime_put_noidle(rk_rng->dev);
return ret;
}
version = rk_rng_readl(rk_rng, TRNG_V1_VERSION);
if (version != TRNG_v1_VERSION_CODE) {
dev_err(rk_rng->dev,
@@ -300,13 +315,11 @@ static int rk_trng_v1_init(struct hwrng *rng)
ret = 0;
exit:
pm_runtime_mark_last_busy(rk_rng->dev);
pm_runtime_put_sync_autosuspend(rk_rng->dev);
return ret;
}
static int rk_trng_v1_read(struct hwrng *rng, void *buf, size_t max, bool wait)
static int trng_v1_read(struct hwrng *rng, void *buf, size_t max, bool wait)
{
int ret = 0;
u32 reg_ctrl = 0;
@@ -350,37 +363,92 @@ out:
return ret;
}
static const struct rk_rng_soc_data rk_crypto_v1_soc_data = {
static int rkrng_init(struct hwrng *rng)
{
struct rk_rng *rk_rng = container_of(rng, struct rk_rng, rng);
u32 reg = 0;
rk_rng_writel(rk_rng, HIWORD_UPDATE(0, 0xffff, 0), RKRNG_CTRL);
reg = rk_rng_readl(rk_rng, RKRNG_STATE);
rk_rng_writel(rk_rng, reg, RKRNG_STATE);
return 0;
}
static int rkrng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
{
struct rk_rng *rk_rng = container_of(rng, struct rk_rng, rng);
u32 reg_ctrl = 0;
int ret;
reg_ctrl = RKRNG_CTRL_SW_DRNG_REQ;
rk_rng_writel(rk_rng, HIWORD_UPDATE(reg_ctrl, 0xffff, 0), RKRNG_CTRL);
ret = readl_poll_timeout(rk_rng->mem + RKRNG_STATE, reg_ctrl,
(reg_ctrl & RKRNG_STATE_SW_DRNG_ACK),
ROCKCHIP_POLL_PERIOD_US,
ROCKCHIP_POLL_TIMEOUT_US);
if (ret)
goto exit;
rk_rng_writel(rk_rng, reg_ctrl, RKRNG_STATE);
ret = min_t(size_t, max, RK_MAX_RNG_BYTE);
rk_rng_read_regs(rk_rng, RKRNG_DRNG_DATA_0, buf, ret);
exit:
/* close TRNG */
rk_rng_writel(rk_rng, HIWORD_UPDATE(0, 0xffff, 0), RKRNG_CTRL);
return ret;
}
static const struct rk_rng_soc_data crypto_v1_soc_data = {
.default_offset = 0,
.rk_rng_read = rk_crypto_v1_read,
.rk_rng_read = crypto_v1_read,
};
static const struct rk_rng_soc_data rk_crypto_v2_soc_data = {
static const struct rk_rng_soc_data crypto_v2_soc_data = {
.default_offset = CRYPTO_V2_RNG_DEFAULT_OFFSET,
.rk_rng_read = rk_crypto_v2_read,
.rk_rng_read = crypto_v2_read,
};
static const struct rk_rng_soc_data rk_trng_v1_soc_data = {
static const struct rk_rng_soc_data trng_v1_soc_data = {
.default_offset = 0,
.rk_rng_init = rk_trng_v1_init,
.rk_rng_read = rk_trng_v1_read,
.rk_rng_init = trng_v1_init,
.rk_rng_read = trng_v1_read,
};
static const struct rk_rng_soc_data rkrng_soc_data = {
.default_offset = 0,
.rk_rng_init = rkrng_init,
.rk_rng_read = rkrng_read,
};
static const struct of_device_id rk_rng_dt_match[] = {
{
.compatible = "rockchip,cryptov1-rng",
.data = (void *)&rk_crypto_v1_soc_data,
.data = (void *)&crypto_v1_soc_data,
},
{
.compatible = "rockchip,cryptov2-rng",
.data = (void *)&rk_crypto_v2_soc_data,
.data = (void *)&crypto_v2_soc_data,
},
{
.compatible = "rockchip,trngv1",
.data = (void *)&rk_trng_v1_soc_data,
.data = (void *)&trng_v1_soc_data,
},
{
.compatible = "rockchip,rkrng",
.data = (void *)&rkrng_soc_data,
},
{ },
};
@@ -450,9 +518,15 @@ static int rk_rng_probe(struct platform_device *pdev)
}
/* for some platform need hardware operation when probe */
if (rk_rng->soc_data->rk_rng_init)
if (rk_rng->soc_data->rk_rng_init) {
pm_runtime_get_sync(rk_rng->dev);
ret = rk_rng->soc_data->rk_rng_init(&rk_rng->rng);
pm_runtime_mark_last_busy(rk_rng->dev);
pm_runtime_put_sync_autosuspend(rk_rng->dev);
}
return ret;
}