rockchip-otp.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2019 Fuzhou Rockchip Electronics Co., Ltd
*/
#include <common.h>
#include <asm/io.h>
#include <command.h>
#include <dm.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <misc.h>
/* OTP Register Offsets */
#define OTPC_SBPI_CTRL 0x0020
#define OTPC_SBPI_CMD_VALID_PRE 0x0024
#define OTPC_SBPI_CS_VALID_PRE 0x0028
#define OTPC_SBPI_STATUS 0x002C
#define OTPC_USER_CTRL 0x0100
#define OTPC_USER_ADDR 0x0104
#define OTPC_USER_ENABLE 0x0108
#define OTPC_USER_QP 0x0120
#define OTPC_USER_Q 0x0124
#define OTPC_INT_STATUS 0x0304
#define OTPC_SBPI_CMD0_OFFSET 0x1000
#define OTPC_SBPI_CMD1_OFFSET 0x1004
/* OTP Register bits and masks */
#define OTPC_USER_ADDR_MASK GENMASK(31, 16)
#define OTPC_USE_USER BIT(0)
#define OTPC_USE_USER_MASK GENMASK(16, 16)
#define OTPC_USER_FSM_ENABLE BIT(0)
#define OTPC_USER_FSM_ENABLE_MASK GENMASK(16, 16)
#define OTPC_SBPI_DONE BIT(1)
#define OTPC_USER_DONE BIT(2)
#define SBPI_DAP_ADDR 0x02
#define SBPI_DAP_ADDR_SHIFT 8
#define SBPI_DAP_ADDR_MASK GENMASK(31, 24)
#define SBPI_CMD_VALID_MASK GENMASK(31, 16)
#define SBPI_DAP_CMD_WRF 0xC0
#define SBPI_DAP_REG_ECC 0x3A
#define SBPI_ECC_ENABLE 0x00
#define SBPI_ECC_DISABLE 0x09
#define SBPI_ENABLE BIT(0)
#define SBPI_ENABLE_MASK GENMASK(16, 16)
#define OTPC_TIMEOUT 10000
struct rockchip_otp_platdata {
void __iomem *base;
unsigned long secure_conf_base;
unsigned long otp_mask_base;
};
static int rockchip_otp_wait_status(struct rockchip_otp_platdata *otp,
u32 flag)
{
int delay = OTPC_TIMEOUT;
while (!(readl(otp->base + OTPC_INT_STATUS) & flag)) {
udelay(1);
delay--;
if (delay <= 0) {
printf("%s: wait init status timeout\n", __func__);
return -ETIMEDOUT;
}
}
/* clean int status */
writel(flag, otp->base + OTPC_INT_STATUS);
return 0;
}
static int rockchip_otp_ecc_enable(struct rockchip_otp_platdata *otp,
bool enable)
{
int ret = 0;
writel(SBPI_DAP_ADDR_MASK | (SBPI_DAP_ADDR << SBPI_DAP_ADDR_SHIFT),
otp->base + OTPC_SBPI_CTRL);
writel(SBPI_CMD_VALID_MASK | 0x1, otp->base + OTPC_SBPI_CMD_VALID_PRE);
writel(SBPI_DAP_CMD_WRF | SBPI_DAP_REG_ECC,
otp->base + OTPC_SBPI_CMD0_OFFSET);
if (enable)
writel(SBPI_ECC_ENABLE, otp->base + OTPC_SBPI_CMD1_OFFSET);
else
writel(SBPI_ECC_DISABLE, otp->base + OTPC_SBPI_CMD1_OFFSET);
writel(SBPI_ENABLE_MASK | SBPI_ENABLE, otp->base + OTPC_SBPI_CTRL);
ret = rockchip_otp_wait_status(otp, OTPC_SBPI_DONE);
if (ret < 0)
printf("%s timeout during ecc_enable\n", __func__);
return ret;
}
static int rockchip_px30_otp_read(struct udevice *dev, int offset,
void *buf, int size)
{
struct rockchip_otp_platdata *otp = dev_get_platdata(dev);
u8 *buffer = buf;
int ret = 0;
ret = rockchip_otp_ecc_enable(otp, false);
if (ret < 0) {
printf("%s rockchip_otp_ecc_enable err\n", __func__);
return ret;
}
writel(OTPC_USE_USER | OTPC_USE_USER_MASK, otp->base + OTPC_USER_CTRL);
udelay(5);
while (size--) {
writel(offset++ | OTPC_USER_ADDR_MASK,
otp->base + OTPC_USER_ADDR);
writel(OTPC_USER_FSM_ENABLE | OTPC_USER_FSM_ENABLE_MASK,
otp->base + OTPC_USER_ENABLE);
ret = rockchip_otp_wait_status(otp, OTPC_USER_DONE);
if (ret < 0) {
printf("%s timeout during read setup\n", __func__);
goto read_end;
}
*buffer++ = readb(otp->base + OTPC_USER_Q);
}
read_end:
writel(0x0 | OTPC_USE_USER_MASK, otp->base + OTPC_USER_CTRL);
return ret;
}
static int rockchip_otp_read(struct udevice *dev, int offset,
void *buf, int size)
{
return rockchip_px30_otp_read(dev, offset, buf, size);
}
static const struct misc_ops rockchip_otp_ops = {
.read = rockchip_otp_read,
};
static int rockchip_otp_ofdata_to_platdata(struct udevice *dev)
{
struct rockchip_otp_platdata *otp = dev_get_platdata(dev);
otp->base = dev_read_addr_ptr(dev);
return 0;
}
static const struct udevice_id rockchip_otp_ids[] = {
{
.compatible = "rockchip,px30-otp",
.data = (ulong)&rockchip_px30_otp_read,
},
{
.compatible = "rockchip,rk3308-otp",
.data = (ulong)&rockchip_px30_otp_read,
},
{}
};
U_BOOT_DRIVER(rockchip_otp) = {
.name = "rockchip_otp",
.id = UCLASS_MISC,
.of_match = rockchip_otp_ids,
.ops = &rockchip_otp_ops,
.ofdata_to_platdata = rockchip_otp_ofdata_to_platdata,
.platdata_auto_alloc_size = sizeof(struct rockchip_otp_platdata),
};