diff --git a/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig index 21d9db2638..ccdb624ba7 100644 --- a/arch/arm/mach-mvebu/Kconfig +++ b/arch/arm/mach-mvebu/Kconfig @@ -44,6 +44,7 @@ config ARMADA_XP config ARMADA_3700 bool select ARM64 + select HAVE_MVEBU_EFUSE # Armada 7K and 8K are very similar - use only one Kconfig symbol for both config ARMADA_8K diff --git a/arch/arm/mach-mvebu/Makefile b/arch/arm/mach-mvebu/Makefile index a5a20877dd..1b451889d2 100644 --- a/arch/arm/mach-mvebu/Makefile +++ b/arch/arm/mach-mvebu/Makefile @@ -27,7 +27,10 @@ obj-$(CONFIG_ARMADA_375) += ../../../drivers/ddr/marvell/axp/xor.o obj-$(CONFIG_ARMADA_38X) += ../../../drivers/ddr/marvell/a38x/xor.o obj-$(CONFIG_ARMADA_XP) += ../../../drivers/ddr/marvell/axp/xor.o obj-$(CONFIG_ARMADA_MSYS) += ../../../drivers/ddr/marvell/axp/xor.o + +ifdef CONFIG_ARMADA_38X obj-$(CONFIG_MVEBU_EFUSE) += efuse.o +endif extra-y += kwbimage.cfg diff --git a/arch/arm/mach-mvebu/armada3700/Makefile b/arch/arm/mach-mvebu/armada3700/Makefile index 031b3e854e..cd74726cc7 100644 --- a/arch/arm/mach-mvebu/armada3700/Makefile +++ b/arch/arm/mach-mvebu/armada3700/Makefile @@ -3,3 +3,4 @@ # Copyright (C) 2016 Stefan Roese obj-y = cpu.o +obj-$(CONFIG_MVEBU_EFUSE) += efuse.o diff --git a/arch/arm/mach-mvebu/armada3700/efuse.c b/arch/arm/mach-mvebu/armada3700/efuse.c new file mode 100644 index 0000000000..03778f17ea --- /dev/null +++ b/arch/arm/mach-mvebu/armada3700/efuse.c @@ -0,0 +1,136 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) 2017 Marvell International Ltd. + * (C) 2021 Pali Rohár + */ + +#include +#include +#include +#include +#include + +#define OTP_NB_REG_BASE ((void __iomem *)MVEBU_REGISTER(0x12600)) +#define OTP_SB_REG_BASE ((void __iomem *)MVEBU_REGISTER(0x1A200)) + +#define OTP_CONTROL_OFF 0x00 +#define OTP_MODE_BIT BIT(15) +#define OTP_RPTR_RST_BIT BIT(14) +#define OTP_POR_B_BIT BIT(13) +#define OTP_PRDT_BIT BIT(3) +#define OTP_READ_PORT_OFF 0x04 +#define OTP_READ_POINTER_OFF 0x08 +#define OTP_PTR_INC_BIT BIT(8) + +static void otp_read_parallel(void __iomem *base, u32 *data, u32 count) +{ + u32 regval; + + /* 1. Clear OTP_MODE_NB to parallel mode */ + regval = readl(base + OTP_CONTROL_OFF); + regval &= ~OTP_MODE_BIT; + writel(regval, base + OTP_CONTROL_OFF); + + /* 2. Set OTP_POR_B_NB enter normal operation */ + regval = readl(base + OTP_CONTROL_OFF); + regval |= OTP_POR_B_BIT; + writel(regval, base + OTP_CONTROL_OFF); + + /* 3. Set OTP_PTR_INC_NB to auto-increment pointer after each read */ + regval = readl(base + OTP_READ_POINTER_OFF); + regval |= OTP_PTR_INC_BIT; + writel(regval, base + OTP_READ_POINTER_OFF); + + /* 4. Set OTP_RPTR_RST_NB, then clear the same field */ + regval = readl(base + OTP_CONTROL_OFF); + regval |= OTP_RPTR_RST_BIT; + writel(regval, base + OTP_CONTROL_OFF); + + regval = readl(base + OTP_CONTROL_OFF); + regval &= ~OTP_RPTR_RST_BIT; + writel(regval, base + OTP_CONTROL_OFF); + + /* 5. Toggle OTP_PRDT_NB + * a. Set OTP_PRDT_NB to 1. + * b. Clear OTP_PRDT_NB to 0. + * c. Wait for a minimum of 100 ns. + * d. Set OTP_PRDT_NB to 1 + */ + regval = readl(base + OTP_CONTROL_OFF); + regval |= OTP_PRDT_BIT; + writel(regval, base + OTP_CONTROL_OFF); + + regval = readl(base + OTP_CONTROL_OFF); + regval &= ~OTP_PRDT_BIT; + writel(regval, base + OTP_CONTROL_OFF); + + ndelay(100); + + regval = readl(base + OTP_CONTROL_OFF); + regval |= OTP_PRDT_BIT; + writel(regval, base + OTP_CONTROL_OFF); + + while (count-- > 0) { + /* 6. Read the content of OTP 32-bits at a time */ + ndelay(100000); + *(data++) = readl(base + OTP_READ_PORT_OFF); + } +} + +/* + * Banks 0-43 are used for accessing Security OTP (44 rows with 67 bits via 44 banks and words 0-2) + * Bank 44 is used for accessing North Bridge OTP (69 bits via words 0-2) + * Bank 45 is used for accessing South Bridge OTP (97 bits via words 0-3) + */ + +#define RWTM_ROWS 44 +#define RWTM_MAX_BANK (RWTM_ROWS - 1) +#define RWTM_ROW_WORDS 3 +#define OTP_NB_BANK RWTM_ROWS +#define OTP_NB_WORDS 3 +#define OTP_SB_BANK (RWTM_ROWS + 1) +#define OTP_SB_WORDS 4 + +int fuse_read(u32 bank, u32 word, u32 *val) +{ + if (bank <= RWTM_MAX_BANK) { + if (word >= RWTM_ROW_WORDS) + return -EINVAL; + /* TODO: not implemented yet */ + return -ENOSYS; + } else if (bank == OTP_NB_BANK) { + u32 data[OTP_NB_WORDS]; + if (word >= OTP_NB_WORDS) + return -EINVAL; + otp_read_parallel(OTP_NB_REG_BASE, data, OTP_NB_WORDS); + *val = data[word]; + return 0; + } else if (bank == OTP_SB_BANK) { + u32 data[OTP_SB_WORDS]; + if (word >= OTP_SB_WORDS) + return -EINVAL; + otp_read_parallel(OTP_SB_REG_BASE, data, OTP_SB_WORDS); + *val = data[word]; + return 0; + } else { + return -EINVAL; + } +} + +int fuse_prog(u32 bank, u32 word, u32 val) +{ + /* TODO: not implemented yet */ + return -ENOSYS; +} + +int fuse_sense(u32 bank, u32 word, u32 *val) +{ + /* not supported */ + return -ENOSYS; +} + +int fuse_override(u32 bank, u32 word, u32 val) +{ + /* not supported */ + return -ENOSYS; +}