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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2015-2016 Reinhard Pfau <reinhard.pfau@gdsys.cc>
- */
- #include <config.h>
- #include <common.h>
- #include <errno.h>
- #include <asm/io.h>
- #include <asm/arch/cpu.h>
- #include <asm/arch/efuse.h>
- #include <asm/arch/soc.h>
- #include <linux/delay.h>
- #include <linux/mbus.h>
- #if defined(CONFIG_MVEBU_EFUSE_FAKE)
- #define DRY_RUN
- #else
- #undef DRY_RUN
- #endif
- #define MBUS_EFUSE_BASE 0xF6000000
- #define MBUS_EFUSE_SIZE BIT(20)
- #define MVEBU_EFUSE_CONTROL (MVEBU_REGISTER(0xE4008))
- enum {
- MVEBU_EFUSE_CTRL_PROGRAM_ENABLE = (1 << 31),
- };
- struct mvebu_hd_efuse {
- u32 bits_31_0;
- u32 bits_63_32;
- u32 bit64;
- u32 reserved0;
- };
- #ifndef DRY_RUN
- static struct mvebu_hd_efuse *efuses =
- (struct mvebu_hd_efuse *)(MBUS_EFUSE_BASE + 0xF9000);
- #else
- static struct mvebu_hd_efuse efuses[EFUSE_LINE_MAX + 1];
- #endif
- static int efuse_initialised;
- static struct mvebu_hd_efuse *get_efuse_line(int nr)
- {
- if (nr < 0 || nr > 63 || !efuse_initialised)
- return NULL;
- return efuses + nr;
- }
- static void enable_efuse_program(void)
- {
- #ifndef DRY_RUN
- setbits_le32(MVEBU_EFUSE_CONTROL, MVEBU_EFUSE_CTRL_PROGRAM_ENABLE);
- #endif
- }
- static void disable_efuse_program(void)
- {
- #ifndef DRY_RUN
- clrbits_le32(MVEBU_EFUSE_CONTROL, MVEBU_EFUSE_CTRL_PROGRAM_ENABLE);
- #endif
- }
- static int do_prog_efuse(struct mvebu_hd_efuse *efuse,
- struct efuse_val *new_val, u32 mask0, u32 mask1)
- {
- struct efuse_val val;
- val.dwords.d[0] = readl(&efuse->bits_31_0);
- val.dwords.d[1] = readl(&efuse->bits_63_32);
- val.lock = readl(&efuse->bit64);
- if (val.lock & 1)
- return -EPERM;
- val.dwords.d[0] |= (new_val->dwords.d[0] & mask0);
- val.dwords.d[1] |= (new_val->dwords.d[1] & mask1);
- val.lock |= new_val->lock;
- writel(val.dwords.d[0], &efuse->bits_31_0);
- mdelay(1);
- writel(val.dwords.d[1], &efuse->bits_63_32);
- mdelay(1);
- writel(val.lock, &efuse->bit64);
- mdelay(5);
- return 0;
- }
- static int prog_efuse(int nr, struct efuse_val *new_val, u32 mask0, u32 mask1)
- {
- struct mvebu_hd_efuse *efuse;
- int res = 0;
- res = mvebu_efuse_init_hw();
- if (res)
- return res;
- efuse = get_efuse_line(nr);
- if (!efuse)
- return -ENODEV;
- if (!new_val)
- return -EINVAL;
- /* only write a fuse line with lock bit */
- if (!new_val->lock)
- return -EINVAL;
- /* according to specs ECC protection bits must be 0 on write */
- if (new_val->bytes.d[7] & 0xFE)
- return -EINVAL;
- if (!new_val->dwords.d[0] && !new_val->dwords.d[1] && (mask0 | mask1))
- return 0;
- enable_efuse_program();
- res = do_prog_efuse(efuse, new_val, mask0, mask1);
- disable_efuse_program();
- return res;
- }
- int mvebu_efuse_init_hw(void)
- {
- int ret;
- if (efuse_initialised)
- return 0;
- ret = mvebu_mbus_add_window_by_id(
- CPU_TARGET_SATA23_DFX, 0xA, MBUS_EFUSE_BASE, MBUS_EFUSE_SIZE);
- if (ret)
- return ret;
- efuse_initialised = 1;
- return 0;
- }
- int mvebu_read_efuse(int nr, struct efuse_val *val)
- {
- struct mvebu_hd_efuse *efuse;
- int res;
- res = mvebu_efuse_init_hw();
- if (res)
- return res;
- efuse = get_efuse_line(nr);
- if (!efuse)
- return -ENODEV;
- if (!val)
- return -EINVAL;
- val->dwords.d[0] = readl(&efuse->bits_31_0);
- val->dwords.d[1] = readl(&efuse->bits_63_32);
- val->lock = readl(&efuse->bit64);
- return 0;
- }
- int mvebu_write_efuse(int nr, struct efuse_val *val)
- {
- return prog_efuse(nr, val, ~0, ~0);
- }
- int mvebu_lock_efuse(int nr)
- {
- struct efuse_val val = {
- .lock = 1,
- };
- return prog_efuse(nr, &val, 0, 0);
- }
- /*
- * wrapper funcs providing the fuse API
- *
- * we use the following mapping:
- * "bank" -> eFuse line
- * "word" -> 0: bits 0-31
- * 1: bits 32-63
- * 2: bit 64 (lock)
- */
- static struct efuse_val prog_val;
- static int valid_prog_words;
- int fuse_read(u32 bank, u32 word, u32 *val)
- {
- struct efuse_val fuse_line;
- int res;
- if (bank < EFUSE_LINE_MIN || bank > EFUSE_LINE_MAX || word > 2)
- return -EINVAL;
- res = mvebu_read_efuse(bank, &fuse_line);
- if (res)
- return res;
- if (word < 2)
- *val = fuse_line.dwords.d[word];
- else
- *val = fuse_line.lock;
- return res;
- }
- int fuse_sense(u32 bank, u32 word, u32 *val)
- {
- /* not supported */
- return -ENOSYS;
- }
- int fuse_prog(u32 bank, u32 word, u32 val)
- {
- int res = 0;
- /*
- * NOTE: Fuse line should be written as whole.
- * So how can we do that with this API?
- * For now: remember values for word == 0 and word == 1 and write the
- * whole line when word == 2.
- * This implies that we always require all 3 fuse prog cmds (one for
- * for each word) to write a single fuse line.
- * Exception is a single write to word 2 which will lock the fuse line.
- *
- * Hope that will be OK.
- */
- if (bank < EFUSE_LINE_MIN || bank > EFUSE_LINE_MAX || word > 2)
- return -EINVAL;
- if (word < 2) {
- prog_val.dwords.d[word] = val;
- valid_prog_words |= (1 << word);
- } else if ((valid_prog_words & 3) == 0 && val) {
- res = mvebu_lock_efuse(bank);
- valid_prog_words = 0;
- } else if ((valid_prog_words & 3) != 3 || !val) {
- res = -EINVAL;
- } else {
- prog_val.lock = val != 0;
- res = mvebu_write_efuse(bank, &prog_val);
- valid_prog_words = 0;
- }
- return res;
- }
- int fuse_override(u32 bank, u32 word, u32 val)
- {
- /* not supported */
- return -ENOSYS;
- }
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