From: Paul Burton paul.burton@imgtec.com
Add driver for the efuse block in the JZ47xx SOC.
Cc: Daniel Schwierzeck daniel.schwierzeck@gmail.com Signed-off-by: Paul Burton paul.burton@imgtec.com Signed-off-by: Marek Vasut marek.vasut@gmail.com Signed-off-by: Ezequiel Garcia ezequiel@collabora.com --- drivers/misc/Kconfig | 6 +++ drivers/misc/Makefile | 1 + drivers/misc/jz4780_efuse.c | 104 ++++++++++++++++++++++++++++++++++++ 3 files changed, 111 insertions(+) create mode 100644 drivers/misc/jz4780_efuse.c
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 48febc47d263..704c8dd1955f 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -120,6 +120,12 @@ config FSL_SEC_MON Security Monitor can be transitioned on any security failures, like software violations or hardware security violations.
+config JZ4780_EFUSE + bool "Ingenic JZ4780 eFUSE support" + depends on ARCH_JZ47XX + help + This selects support for the eFUSE on Ingenic JZ4780 SoCs. + config MXC_OCOTP bool "Enable MXC OCOTP Driver" help diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 302d44159274..6bdf5054f475 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -62,3 +62,4 @@ obj-$(CONFIG_TEGRA_CAR) += tegra_car.o obj-$(CONFIG_TWL4030_LED) += twl4030_led.o obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress_config.o obj-$(CONFIG_WINBOND_W83627) += winbond_w83627.o +obj-$(CONFIG_JZ4780_EFUSE) += jz4780_efuse.o diff --git a/drivers/misc/jz4780_efuse.c b/drivers/misc/jz4780_efuse.c new file mode 100644 index 000000000000..7b327f54b15c --- /dev/null +++ b/drivers/misc/jz4780_efuse.c @@ -0,0 +1,104 @@ +/* + * JZ4780 EFUSE driver + * + * Copyright (c) 2014 Imagination Technologies + * Author: Alex Smith alex.smith@imgtec.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/io.h> +#include <asm/unaligned.h> +#include <errno.h> +#include <mach/jz4780.h> +#include <wait_bit.h> + +#define EFUSE_EFUCTRL 0xd0 +#define EFUSE_EFUCFG 0xd4 +#define EFUSE_EFUSTATE 0xd8 +#define EFUSE_EFUDATA(n) (0xdc + ((n) * 4)) + +#define EFUSE_EFUCTRL_RD_EN BIT(0) +#define EFUSE_EFUCTRL_LEN_BIT 16 +#define EFUSE_EFUCTRL_LEN_MASK 0x1f +#define EFUSE_EFUCTRL_ADDR_BIT 21 +#define EFUSE_EFUCTRL_ADDR_MASK 0x1ff +#define EFUSE_EFUCTRL_CS BIT(30) + +#define EFUSE_EFUCFG_RD_STROBE_BIT 16 +#define EFUSE_EFUCFG_RD_STROBE_MASK 0xf +#define EFUSE_EFUCFG_RD_ADJ_BIT 20 +#define EFUSE_EFUCFG_RD_ADJ_MASK 0xf + +#define EFUSE_EFUSTATE_RD_DONE BIT(0) + +static void jz4780_efuse_read_chunk(size_t addr, size_t count, u8 *buf) +{ + void __iomem *regs = (void __iomem *)NEMC_BASE; + size_t i; + u32 val; + int ret; + + val = EFUSE_EFUCTRL_RD_EN | + ((count - 1) << EFUSE_EFUCTRL_LEN_BIT) | + (addr << EFUSE_EFUCTRL_ADDR_BIT) | + ((addr > 0x200) ? EFUSE_EFUCTRL_CS : 0); + writel(val, regs + EFUSE_EFUCTRL); + + ret = wait_for_bit_le32(regs + EFUSE_EFUSTATE, + EFUSE_EFUSTATE_RD_DONE, true, 10000, false); + if (ret) + return; + + if ((count % 4) == 0) { + for (i = 0; i < count / 4; i++) { + val = readl(regs + EFUSE_EFUDATA(i)); + put_unaligned(val, (u32 *)(buf + (i * 4))); + } + } else { + val = readl(regs + EFUSE_EFUDATA(0)); + if (count > 2) + buf[2] = (val >> 16) & 0xff; + if (count > 1) + buf[1] = (val >> 8) & 0xff; + buf[0] = val & 0xff; + } +} + +static inline int jz4780_efuse_chunk_size(size_t count) +{ + if (count >= 32) + return 32; + else if ((count / 4) > 0) + return (count / 4) * 4; + else + return count % 4; +} + +void jz4780_efuse_read(size_t addr, size_t count, u8 *buf) +{ + size_t chunk; + + while (count > 0) { + chunk = jz4780_efuse_chunk_size(count); + jz4780_efuse_read_chunk(addr, chunk, buf); + addr += chunk; + buf += chunk; + count -= chunk; + } +} + +void jz4780_efuse_init(u32 ahb2_rate) +{ + void __iomem *regs = (void __iomem *)NEMC_BASE; + u32 rd_adj, rd_strobe, tmp; + + rd_adj = (((6500 * (ahb2_rate / 1000000)) / 1000000) + 0xf) / 2; + tmp = (((35000 * (ahb2_rate / 1000000)) / 1000000) - 4) - rd_adj; + rd_strobe = ((tmp + 0xf) / 2 < 7) ? 7 : (tmp + 0xf) / 2; + + tmp = (rd_adj << EFUSE_EFUCFG_RD_ADJ_BIT) | + (rd_strobe << EFUSE_EFUCFG_RD_STROBE_BIT); + writel(tmp, regs + EFUSE_EFUCFG); +}