This adds a simple driver to dump specified values of Rockchip SoC from otp, such as cpu-leakage, id etc.
Signed-off-by: Alexander Shiyan <[email protected]> --- drivers/nvmem/Kconfig | 7 + drivers/nvmem/Makefile | 1 + drivers/nvmem/rockchip-otp.c | 448 +++++++++++++++++++++++++++++++++++ 3 files changed, 456 insertions(+) create mode 100644 drivers/nvmem/rockchip-otp.c diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index 2e60734156..bea356c900 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -58,6 +58,13 @@ config EEPROM_93XX46 supports both read and write commands and also the command to erase the whole EEPROM. +config NVMEM_ROCKCHIP_OTP + tristate "Rockchip OTP controller support" + depends on ARCH_ROCKCHIP || COMPILE_TEST + help + This is a simple driver to dump specified values of Rockchip SoC + from otp, such as cpu-leakage, id etc. + config STM32_BSEC tristate "STM32 Boot and security and OTP control" depends on ARCH_STM32MP diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile index 62a1f925dd..a3f3c31602 100644 --- a/drivers/nvmem/Makefile +++ b/drivers/nvmem/Makefile @@ -27,4 +27,5 @@ nvmem_bsec-y := bsec.o obj-$(CONFIG_KVX_OTP_NV) += nvmem-kvx-otp-nv.o nvmem-kvx-otp-nv-y := kvx-otp-nv.o +obj-$(CONFIG_NVMEM_ROCKCHIP_OTP)+= rockchip-otp.o obj-$(CONFIG_STARFIVE_OTP) += starfive-otp.o diff --git a/drivers/nvmem/rockchip-otp.c b/drivers/nvmem/rockchip-otp.c new file mode 100644 index 0000000000..b8da4c5380 --- /dev/null +++ b/drivers/nvmem/rockchip-otp.c @@ -0,0 +1,448 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Rockchip OTP Driver + * + * Copyright (c) 2018 Rockchip Electronics Co. Ltd. + * Author: Finley Xiao <[email protected]> + */ + +#include <common.h> +#include <driver.h> +#include <init.h> +#include <of.h> +#include <of_device.h> +#include <linux/clk.h> +#include <linux/iopoll.h> +#include <linux/nvmem-provider.h> +#include <linux/reset.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_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 + +#define RK3568_NBYTES 2 + +/* 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 *clks; + int num_clks; + int (*reg_read)(void *ctx, unsigned int reg, void *val, size_t val_size); +}; + +struct rockchip_otp { + struct device *dev; + void __iomem *base; + struct clk_bulk_data *clks; + struct reset_control *rst; + const struct rockchip_data *data; +}; + +static int rockchip_otp_reset(struct rockchip_otp *otp) +{ + int ret; + + ret = reset_control_assert(otp->rst); + if (ret) { + dev_err(otp->dev, "failed to assert otp phy %d\n", ret); + return ret; + } + + udelay(2); + + ret = reset_control_deassert(otp->rst); + if (ret) { + dev_err(otp->dev, "failed to deassert otp phy %d\n", ret); + return ret; + } + + return 0; +} + +static int rockchip_otp_wait_status(struct rockchip_otp *otp, + unsigned int reg, u32 flag) +{ + u32 status = 0; + int ret; + + ret = readl_poll_timeout(otp->base + reg, status, + (status & flag), OTPC_TIMEOUT); + if (ret) + return ret; + + /* clean int status */ + writel(flag, otp->base + reg); + + return 0; +} + +static int rockchip_otp_ecc_enable(struct rockchip_otp *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_INT_STATUS, OTPC_SBPI_DONE); + if (ret < 0) + dev_err(otp->dev, "timeout during ecc_enable\n"); + + return ret; +} + +static int px30_otp_read(void *context, unsigned int offset, + void *val, size_t bytes) +{ + struct rockchip_otp *otp = context; + u8 *buf = val; + int ret; + + ret = rockchip_otp_reset(otp); + if (ret) { + dev_err(otp->dev, "failed to reset otp phy\n"); + return ret; + } + + ret = rockchip_otp_ecc_enable(otp, false); + if (ret < 0) { + dev_err(otp->dev, "rockchip_otp_ecc_enable err\n"); + return ret; + } + + writel(OTPC_USE_USER | OTPC_USE_USER_MASK, otp->base + OTPC_USER_CTRL); + udelay(5); + while (bytes--) { + 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_INT_STATUS, OTPC_USER_DONE); + if (ret < 0) { + dev_err(otp->dev, "timeout during read setup\n"); + goto read_end; + } + *buf++ = readb(otp->base + OTPC_USER_Q); + } + +read_end: + writel(0x0 | OTPC_USE_USER_MASK, otp->base + OTPC_USER_CTRL); + + return ret; +} + +static int rk3568_otp_read(void *context, unsigned int offset, void *val, + size_t bytes) +{ + struct rockchip_otp *otp = context; + unsigned int addr_start, addr_end, addr_offset, addr_len; + u32 out_value; + u8 *buf; + int ret = 0, i = 0; + + addr_start = rounddown(offset, RK3568_NBYTES) / RK3568_NBYTES; + addr_end = roundup(offset + bytes, RK3568_NBYTES) / RK3568_NBYTES; + addr_offset = offset % RK3568_NBYTES; + addr_len = addr_end - addr_start; + + buf = kzalloc(array3_size(addr_len, RK3568_NBYTES, sizeof(*buf)), + GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = rockchip_otp_reset(otp); + if (ret) { + dev_err(otp->dev, "failed to reset otp phy\n"); + goto out; + } + + ret = rockchip_otp_ecc_enable(otp, false); + if (ret < 0) { + dev_err(otp->dev, "rockchip_otp_ecc_enable err\n"); + goto out; + } + + writel(OTPC_USE_USER | OTPC_USE_USER_MASK, otp->base + OTPC_USER_CTRL); + udelay(5); + while (addr_len--) { + writel(addr_start++ | 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_INT_STATUS, OTPC_USER_DONE); + if (ret < 0) { + dev_err(otp->dev, "timeout during read setup\n"); + goto read_end; + } + out_value = readl(otp->base + OTPC_USER_Q); + memcpy(&buf[i], &out_value, RK3568_NBYTES); + i += RK3568_NBYTES; + } + + memcpy(val, buf + addr_offset, bytes); + +read_end: + writel(0x0 | OTPC_USE_USER_MASK, otp->base + OTPC_USER_CTRL); +out: + kfree(buf); + + 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 = 0, 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) +{ + struct rockchip_otp *otp = context; + int ret; + + if (!otp->data || !otp->data->reg_read) + return -EINVAL; + + ret = clk_bulk_enable(otp->data->num_clks, otp->clks); + if (ret < 0) { + dev_err(otp->dev, "failed to prepare/enable clks\n"); + return ret; + } + + ret = otp->data->reg_read(context, offset, val, bytes); + + clk_bulk_disable(otp->data->num_clks, otp->clks); + + return ret; +} + +static struct nvmem_config otp_config = { + .name = "rockchip-otp", + .read_only = true, + .stride = 1, + .word_size = 1, + .reg_read = rockchip_otp_read, +}; + +static const char * const px30_otp_clocks[] = { + "otp", "apb_pclk", "phy", +}; + +static const struct rockchip_data px30_data = { + .size = 0x40, + .clks = px30_otp_clocks, + .num_clks = ARRAY_SIZE(px30_otp_clocks), + .reg_read = px30_otp_read, +}; + +static const char * const rk3568_otp_clocks[] = { + "usr", "sbpi", "apb", "phy", +}; + +static const struct rockchip_data rk3568_data = { + .size = 0x80, + .clks = rk3568_otp_clocks, + .num_clks = ARRAY_SIZE(rk3568_otp_clocks), + .reg_read = rk3568_otp_read, +}; + +static const char * const rk3588_otp_clocks[] = { + "otp", "apb_pclk", "phy", "arb", +}; + +static const struct rockchip_data rk3588_data = { + .size = 0x400, + .clks = rk3588_otp_clocks, + .num_clks = ARRAY_SIZE(rk3588_otp_clocks), + .reg_read = rk3588_otp_read, +}; + +static __maybe_unused const struct of_device_id rockchip_otp_match[] = { + { + .compatible = "rockchip,px30-otp", + .data = &px30_data, + }, + { + .compatible = "rockchip,rk3308-otp", + .data = &px30_data, + }, + { + .compatible = "rockchip,rk3568-otp", + .data = &rk3568_data, + }, + { + .compatible = "rockchip,rk3588-otp", + .data = &rk3588_data, + }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, rockchip_otp_match); + +static int rockchip_otp_probe(struct device *dev) +{ + struct rockchip_otp *otp; + const struct rockchip_data *data; + struct nvmem_device *nvmem; + struct resource *res; + int ret, i; + + data = of_device_get_match_data(dev); + if (!data) + return dev_err_probe(dev, -EINVAL, "failed to get match data\n"); + + otp = kzalloc(sizeof(*otp), GFP_KERNEL); + if (!otp) + return -ENOMEM; + + res = dev_request_mem_resource(dev, 0); + if (IS_ERR(res)) { + ret = PTR_ERR(res); + goto err_free; + } + + otp->data = data; + otp->dev = dev; + otp->base = IOMEM(res->start); + + otp->clks = kcalloc(data->num_clks, sizeof(*otp->clks), GFP_KERNEL); + if (!otp->clks) { + ret = -ENOMEM; + goto err_free; + } + + for (i = 0; i < data->num_clks; ++i) + otp->clks[i].id = data->clks[i]; + + ret = clk_bulk_get_optional(dev, data->num_clks, otp->clks); + if (ret) + goto err_clk; + + otp->rst = reset_control_get(dev, NULL); + if (IS_ERR(otp->rst)) { + ret = PTR_ERR(otp->rst); + goto err_rst; + } + + otp_config.size = data->size; + otp_config.priv = otp; + otp_config.dev = dev; + + nvmem = nvmem_register(&otp_config); + if (!IS_ERR(nvmem)) + return 0; + + ret = PTR_ERR(nvmem); + + reset_control_put(otp->rst); + +err_rst: + clk_bulk_put_all(data->num_clks, otp->clks); + +err_clk: + kfree(otp->clks); + +err_free: + kfree(otp); + + return ret; +} + +static struct driver rockchip_otp_driver = { + .name = "rockchip-otp", + .probe = rockchip_otp_probe, + .of_compatible = DRV_OF_COMPAT(rockchip_otp_match), +}; +device_platform_driver(rockchip_otp_driver); -- 2.39.1
