From a907dc3f25fa90becb4202c7cf973b4fc5abaa1b Mon Sep 17 00:00:00 2001 From: Finley Xiao Date: Wed, 25 Sep 2019 17:57:49 +0200 Subject: [PATCH] misc: add driver for the Rockchip otp controller Newer Rockchip socs like the px30 use a different ip block to handle one-time-programmable memory, so add a misc driver for it as well. Signed-off-by: Finley Xiao Signed-off-by: Heiko Stuebner Reviewed-by: Kever Yang --- drivers/misc/Kconfig | 9 +++ drivers/misc/Makefile | 1 + drivers/misc/rockchip-otp.c | 176 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 186 insertions(+) create mode 100644 drivers/misc/rockchip-otp.c diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 7a8ba58..82bb093 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -59,6 +59,15 @@ config ROCKCHIP_EFUSE extended (by porting the read function from the Linux kernel sources) to support other recent Rockchip devices. +config ROCKCHIP_OTP + bool "Rockchip OTP Support" + depends on MISC + help + Enable (read-only) access for the one-time-programmable memory block + found in Rockchip SoCs: accesses can either be made using byte + addressing and a length or through child-nodes that are generated + based on the e-fuse map retrieved from the DTS. + config VEXPRESS_CONFIG bool "Enable support for Arm Versatile Express config bus" depends on MISC diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 870655e..55976d6 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -53,6 +53,7 @@ obj-$(CONFIG_PCA9551_LED) += pca9551_led.o obj-$(CONFIG_$(SPL_)PWRSEQ) += pwrseq-uclass.o obj-$(CONFIG_QFW) += qfw.o obj-$(CONFIG_ROCKCHIP_EFUSE) += rockchip-efuse.o +obj-$(CONFIG_ROCKCHIP_OTP) += rockchip-otp.o obj-$(CONFIG_SANDBOX) += syscon_sandbox.o misc_sandbox.o obj-$(CONFIG_SMSC_LPC47M) += smsc_lpc47m.o obj-$(CONFIG_SMSC_SIO1007) += smsc_sio1007.o diff --git a/drivers/misc/rockchip-otp.c b/drivers/misc/rockchip-otp.c new file mode 100644 index 0000000..bdd443b --- /dev/null +++ b/drivers/misc/rockchip-otp.c @@ -0,0 +1,176 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2019 Fuzhou Rockchip Electronics Co., Ltd + */ + +#include +#include +#include +#include +#include +#include +#include + +/* 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), +}; -- 2.7.4