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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * JZ4780 EFUSE driver
- *
- * Copyright (c) 2014 Imagination Technologies
- * Author: Alex Smith <alex.smith@imgtec.com>
- */
- #include <common.h>
- #include <asm/io.h>
- #include <asm/unaligned.h>
- #include <errno.h>
- #include <linux/bitops.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);
- }
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