This adds a simple driver for reading the efuse block of the RK3399. It should be easy enough to add drivers for other devices (e.g. the RK3328, RK3368, etc.) by passing the device details via driver_data.

Unlike the kernel driver (using the nvmem subsystem), we don't expose the efuse as multiple named cells, but rather as a linear memory that can be read using misc_read(...).

The primary use case (as of today) is the generation of a 'serial#' (and a 'cpuid#') environment variable for the RK3399-Q7 (Puma) system-on-module.

Note that this adds a debug-only (i.e. only if DEBUG is defined) command 'rk3399_dump_efuses' that dumps the efuse block's content. N.B.: The name 'rk3399_dump_efuses' was intentionally chosen to include a SoC-name (together with a comment in the function) to remind whoever adds support for additional SoCs that this function currently makes assumptions regarding the size of the fuse-box based on the RK3399. The hope is that the function is adjusted to reflect any changes resulting from generalising the driver for multiple SoCs and is then renamed.

Signed-off-by: Philipp Tomsich philipp.tomsich@theobroma-systems.com

Reviewed-by: Simon Glass sjg@chromium.org

---

Changes in v3: - uses uclass_get_device_by_driver() to ensure we don't pick up the wrong misc-device

Changes in v2: None

drivers/misc/Kconfig | 14 ++++ drivers/misc/Makefile | 1 + drivers/misc/rockchip-efuse.c | 162 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 177 insertions(+) create mode 100644 drivers/misc/rockchip-efuse.c

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 1aae4bc..ed57414 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -20,6 +20,19 @@ config ALTERA_SYSID Select this to enable a sysid for Altera devices. Please find details on the "Embedded Peripherals IP User Guide" of Altera.

+config ROCKCHIP_EFUSE + bool "Rockchip e-fuse support" + depends on MISC + help + Enable (read-only) access for the e-fuse 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. + + This driver currently supports the RK3399 only, but can easily be + extended (by porting the read function from the Linux kernel sources) + to support other recent Rockchip devices. + config CMD_CROS_EC bool "Enable crosec command" depends on CROS_EC @@ -167,4 +180,5 @@ config I2C_EEPROM depends on MISC help Enable a generic driver for EEPROMs attached via I2C. + endmenu diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 4543cd6..42d946a 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -50,3 +50,4 @@ obj-$(CONFIG_PCA9551_LED) += pca9551_led.o obj-$(CONFIG_FSL_DEVICE_DISABLE) += fsl_devdis.o obj-$(CONFIG_WINBOND_W83627) += winbond_w83627.o obj-$(CONFIG_QFW) += qfw.o +obj-$(CONFIG_ROCKCHIP_EFUSE) += rockchip-efuse.o \ No newline at end of file diff --git a/drivers/misc/rockchip-efuse.c b/drivers/misc/rockchip-efuse.c new file mode 100644 index 0000000..f4e31e2 --- /dev/null +++ b/drivers/misc/rockchip-efuse.c @@ -0,0 +1,162 @@ +/* + * eFuse driver for Rockchip devices + * + * Copyright 2017, Theobroma Systems Design und Consulting GmbH + * Written by Philipp Tomsich philipp.tomsich@theobroma-systems.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/io.h> +#include <command.h> +#include <display_options.h> +#include <dm.h> +#include <linux/bitops.h> +#include <linux/delay.h> +#include <misc.h> + +#define RK3399_A_SHIFT 16 +#define RK3399_A_MASK 0x3ff +#define RK3399_NFUSES 32 +#define RK3399_BYTES_PER_FUSE 4 +#define RK3399_STROBSFTSEL BIT(9) +#define RK3399_RSB BIT(7) +#define RK3399_PD BIT(5) +#define RK3399_PGENB BIT(3) +#define RK3399_LOAD BIT(2) +#define RK3399_STROBE BIT(1) +#define RK3399_CSB BIT(0) + +struct rockchip_efuse_regs { + u32 ctrl; /* 0x00 efuse control register */ + u32 dout; /* 0x04 efuse data out register */ + u32 rf; /* 0x08 efuse redundancy bit used register */ + u32 _rsvd0; + u32 jtag_pass; /* 0x10 JTAG password */ + u32 strobe_finish_ctrl; + /* 0x14 efuse strobe finish control register */ +}; + +struct rockchip_efuse_platdata { + void __iomem *base; + struct clk *clk; +}; + +#if defined(DEBUG) +static int dump_efuses(cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]) +{ + /* + * N.B.: This function is tailored towards the RK3399 and assumes that + * there's always 32 fuses x 32 bits (i.e. 128 bytes of data) to + * be read. + */ + + struct udevice *dev; + u8 fuses[128]; + int ret; + + /* retrieve the device */ + ret = uclass_get_device_by_driver(UCLASS_MISC, + DM_GET_DRIVER(rockchip_efuse), &dev); + if (ret) { + printf("%s: no misc-device found\n", __func__); + return 0; + } + + ret = misc_read(dev, 0, &fuses, sizeof(fuses)); + if (ret) { + printf("%s: misc_read failed\n", __func__); + return 0; + } + + printf("efuse-contents:\n"); + print_buffer(0, fuses, 1, 128, 16); + + return 0; +} + +U_BOOT_CMD( + rk3399_dump_efuses, 1, 1, dump_efuses, + "Dump the content of the efuses", + "" +); +#endif + +static int rockchip_rk3399_efuse_read(struct udevice *dev, int offset, + void *buf, int size) +{ + struct rockchip_efuse_platdata *plat = dev_get_platdata(dev); + struct rockchip_efuse_regs *efuse = + (struct rockchip_efuse_regs *)plat->base; + + unsigned int addr_start, addr_end, addr_offset; + u32 out_value; + u8 bytes[RK3399_NFUSES * RK3399_BYTES_PER_FUSE]; + int i = 0; + u32 addr; + + addr_start = offset / RK3399_BYTES_PER_FUSE; + addr_offset = offset % RK3399_BYTES_PER_FUSE; + addr_end = DIV_ROUND_UP(offset + size, RK3399_BYTES_PER_FUSE); + + /* cap to the size of the efuse block */ + if (addr_end > RK3399_NFUSES) + addr_end = RK3399_NFUSES; + + writel(RK3399_LOAD | RK3399_PGENB | RK3399_STROBSFTSEL | RK3399_RSB, + &efuse->ctrl); + udelay(1); + for (addr = addr_start; addr < addr_end; addr++) { + setbits_le32(&efuse->ctrl, + RK3399_STROBE | (addr << RK3399_A_SHIFT)); + udelay(1); + out_value = readl(&efuse->dout); + clrbits_le32(&efuse->ctrl, RK3399_STROBE); + udelay(1); + + memcpy(&bytes[i], &out_value, RK3399_BYTES_PER_FUSE); + i += RK3399_BYTES_PER_FUSE; + } + + /* Switch to standby mode */ + writel(RK3399_PD | RK3399_CSB, &efuse->ctrl); + + memcpy(buf, bytes + addr_offset, size); + + return 0; +} + +static int rockchip_efuse_read(struct udevice *dev, int offset, + void *buf, int size) +{ + return rockchip_rk3399_efuse_read(dev, offset, buf, size); +} + +static const struct misc_ops rockchip_efuse_ops = { + .read = rockchip_efuse_read, +}; + +static int rockchip_efuse_ofdata_to_platdata(struct udevice *dev) +{ + struct rockchip_efuse_platdata *plat = dev_get_platdata(dev); + + plat->base = (void *)dev_get_addr(dev); + return 0; +} + +static const struct udevice_id rockchip_efuse_ids[] = { + { .compatible = "rockchip,rk3399-efuse" }, + {} +}; + +U_BOOT_DRIVER(rockchip_efuse) = { + .name = "rockchip_efuse", + .id = UCLASS_MISC, + .of_match = rockchip_efuse_ids, + .ofdata_to_platdata = rockchip_efuse_ofdata_to_platdata, + .platdata_auto_alloc_size = sizeof(struct rockchip_efuse_platdata), + .ops = &rockchip_efuse_ops, +}; +

With our efuse driver for the RK3399 ready, we can add the board-specific code that consumes the cpuid from the efuse block and postprocesses it into the system serial (using the same CRC32 based derivation as in Linux).

We expose the cpuid via two distinct environment variables: serial# - the serial number, as derived in Linux cpuid# - the raw 16 byte CPU id field from the fuse block

Signed-off-by: Philipp Tomsich philipp.tomsich@theobroma-systems.com ---

Changes in v3: None Changes in v2: None

board/theobroma-systems/puma_rk3399/puma-rk3399.c | 79 +++++++++++++++++++++++ include/configs/puma_rk3399.h | 6 ++ 2 files changed, 85 insertions(+)

diff --git a/board/theobroma-systems/puma_rk3399/puma-rk3399.c b/board/theobroma-systems/puma_rk3399/puma-rk3399.c index 6231369..72719f3 100644 --- a/board/theobroma-systems/puma_rk3399/puma-rk3399.c +++ b/board/theobroma-systems/puma_rk3399/puma-rk3399.c @@ -9,6 +9,7 @@ #include <ram.h> #include <dm/pinctrl.h> #include <dm/uclass-internal.h> +#include <misc.h> #include <asm/arch/periph.h> #include <power/regulator.h> #include <u-boot/sha256.h> @@ -16,6 +17,9 @@ #include <usb.h> #include <dwc3-uboot.h>

+#define RK3399_CPUID_OFF 0x7 +#define RK3399_CPUID_LEN 0x10 + DECLARE_GLOBAL_DATA_PTR;

#define RK3399_CPUID_OFF 0x7 @@ -66,6 +70,81 @@ out: return 0; }

+static void setup_serial(void) +{ +#if CONFIG_IS_ENABLED(ROCKCHIP_EFUSE) + struct udevice *dev; + int ret, i; + u8 cpuid[RK3399_CPUID_LEN]; + u8 low[RK3399_CPUID_LEN/2], high[RK3399_CPUID_LEN/2]; + char cpuid_str[RK3399_CPUID_LEN * 2 + 1]; + u64 serialno; + char serialno_str[16]; + + /* the first misc device will be used */ + ret = uclass_get_device(UCLASS_MISC, 0, &dev); + if (ret) { + debug("%s: could not find efuse device\n", __func__); + return; + } + + /* read the cpu_id range from the efuses */ + ret = misc_read(dev, RK3399_CPUID_OFF, &cpuid, sizeof(cpuid)); + if (ret) { + debug("%s: reading cpuid from the efuses failed\n", + __func__); + return; + } + + memset(cpuid_str, 0, sizeof(cpuid_str)); + for (i = 0; i < 16; i++) + sprintf(&cpuid_str[i * 2], "%02x", cpuid[i]); + + debug("cpuid: %s\n", cpuid_str); + + /* + * Mix the cpuid bytes using the same rules as in + * ${linux}/drivers/soc/rockchip/rockchip-cpuinfo.c + */ + for (i = 0; i < 8; i++) { + low[i] = cpuid[1 + (i << 1)]; + high[i] = cpuid[i << 1]; + } + + serialno = crc32_no_comp(0, low, 8); + serialno |= (u64)crc32_no_comp(serialno, high, 8) << 32; + snprintf(serialno_str, sizeof(serialno_str), "%llx", serialno); + + setenv("cpuid#", cpuid_str); + setenv("serial#", serialno_str); +#endif + + return; +} + +int misc_init_r(void) +{ + setup_serial(); + + return 0; +} + +#ifdef CONFIG_SERIAL_TAG +void get_board_serial(struct tag_serialnr *serialnr) +{ + char *serial_string; + u64 serial = 0; + + serial_string = getenv("serial#"); + + if (serial_string) + serial = simple_strtoull(serial_string, NULL, 16); + + serialnr->high = (u32)(serial >> 32); + serialnr->low = (u32)(serial & 0xffffffff); +} +#endif + int dram_init(void) { struct ram_info ram; diff --git a/include/configs/puma_rk3399.h b/include/configs/puma_rk3399.h index f778744..4081362 100644 --- a/include/configs/puma_rk3399.h +++ b/include/configs/puma_rk3399.h @@ -22,4 +22,10 @@

#define SDRAM_BANK_SIZE (2UL << 30)

+#define CONFIG_MISC_INIT_R +#define CONFIG_SERIAL_TAG +#define CONFIG_ENV_OVERWRITE + +#define CONFIG_SYS_WHITE_ON_BLACK + #endif