[PATCH 7/8] nvmem: rockchip-otp: Add support for RK3588

Cristian Ciocaltea
2023-05-01T08:44:42Z

Add support for the OTP memory device found on the Rockchip RK3588 SoC.

While here, remove the unnecessary 'void *' casts in the OF device ID
table.

Co-developed-by: Finley Xiao <finley.xiao@rock-chips.com>
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
---
drivers/nvmem/rockchip-otp.c | 78 +++++++++++++++++++++++++++++++++++-
1 file changed, 76 insertions(+), 2 deletions(-)

diff --git a/drivers/nvmem/rockchip-otp.c b/drivers/nvmem/rockchip-otp.c
index 4370d6c5e4e9..022691cadf94 100644
--- a/drivers/nvmem/rockchip-otp.c
+++ b/drivers/nvmem/rockchip-otp.c
@@ -54,6 +54,19 @@

#define OTPC_TIMEOUT 10000

+/* RK3588 Register */
+#define RK3588_OTPC_AUTO_CTRL 0x04
+#define RK3588_OTPC_AUTO_EN 0x08
+#define RK3588_OTPC_INT_ST 0x84
+#define RK3588_OTPC_DOUT0 0x20
+#define RK3588_NO_SECURE_OFFSET 0x300
+#define RK3588_NBYTES 4
+#define RK3588_BURST_NUM 1
+#define RK3588_BURST_SHIFT 8
+#define RK3588_ADDR_SHIFT 16
+#define RK3588_AUTO_EN BIT(0)
+#define RK3588_RD_DONE BIT(1)
+
struct rockchip_data {
int size;
const char * const *clocks;
@@ -171,6 +184,52 @@ static int px30_otp_read(void *context, unsigned int offset,
return ret;
}

+static int rk3588_otp_read(void *context, unsigned int offset,
+ void *val, size_t bytes)
+{
+ struct rockchip_otp *otp = context;
+ unsigned int addr_start, addr_end, addr_len;
+ int ret, i = 0;
+ u32 data;
+ u8 *buf;
+
+ addr_start = round_down(offset, RK3588_NBYTES) / RK3588_NBYTES;
+ addr_end = round_up(offset + bytes, RK3588_NBYTES) / RK3588_NBYTES;
+ addr_len = addr_end - addr_start;
+ addr_start += RK3588_NO_SECURE_OFFSET;
+
+ buf = kzalloc(array_size(addr_len, RK3588_NBYTES), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ while (addr_len--) {
+ writel((addr_start << RK3588_ADDR_SHIFT) |
+ (RK3588_BURST_NUM << RK3588_BURST_SHIFT),
+ otp->base + RK3588_OTPC_AUTO_CTRL);
+ writel(RK3588_AUTO_EN, otp->base + RK3588_OTPC_AUTO_EN);
+
+ ret = rockchip_otp_wait_status(otp, RK3588_OTPC_INT_ST,
+ RK3588_RD_DONE);
+ if (ret < 0) {
+ dev_err(otp->dev, "timeout during read setup\n");
+ goto read_end;
+ }
+
+ data = readl(otp->base + RK3588_OTPC_DOUT0);
+ memcpy(&buf[i], &data, RK3588_NBYTES);
+
+ i += RK3588_NBYTES;
+ addr_start++;
+ }
+
+ memcpy(val, buf + offset % RK3588_NBYTES, bytes);
+
+read_end:
+ kfree(buf);
+
+ return ret;
+}
+
static int rockchip_otp_read(void *context, unsigned int offset,
void *val, size_t bytes)
{
@@ -213,14 +272,29 @@ static const struct rockchip_data px30_data = {
.reg_read = px30_otp_read,
};

+static const char * const rk3588_otp_clocks[] = {
+ "otpc", "apb", "arb", "phy",
+};
+
+static const struct rockchip_data rk3588_data = {
+ .size = 0x400,
+ .clocks = rk3588_otp_clocks,
+ .num_clks = ARRAY_SIZE(rk3588_otp_clocks),
+ .reg_read = rk3588_otp_read,
+};
+
static const struct of_device_id rockchip_otp_match[] = {
{
.compatible = "rockchip,px30-otp",
- .data = (void *)&px30_data,
+ .data = &px30_data,
},
{
.compatible = "rockchip,rk3308-otp",
- .data = (void *)&px30_data,
+ .data = &px30_data,
+ },
+ {
+ .compatible = "rockchip,rk3588-otp",
+ .data = &rk3588_data,
},
{ /* sentinel */ },
};
--
2.40.0