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![Philipp Tomsich](/assets/img/avatar_default.png)
With the dev_read_addr_ptr function available, we can change the efuse driver to use it (and eliminate the explicit type-cast). Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com> Reviewed-by: Simon Glass <sjg@chromium.org>
162 lines
4.0 KiB
C
162 lines
4.0 KiB
C
/*
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* eFuse driver for Rockchip devices
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*
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* Copyright 2017, Theobroma Systems Design und Consulting GmbH
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* Written by Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <command.h>
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#include <display_options.h>
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#include <dm.h>
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#include <misc.h>
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#define RK3399_A_SHIFT 16
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#define RK3399_A_MASK 0x3ff
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#define RK3399_NFUSES 32
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#define RK3399_BYTES_PER_FUSE 4
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#define RK3399_STROBSFTSEL BIT(9)
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#define RK3399_RSB BIT(7)
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#define RK3399_PD BIT(5)
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#define RK3399_PGENB BIT(3)
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#define RK3399_LOAD BIT(2)
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#define RK3399_STROBE BIT(1)
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#define RK3399_CSB BIT(0)
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struct rockchip_efuse_regs {
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u32 ctrl; /* 0x00 efuse control register */
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u32 dout; /* 0x04 efuse data out register */
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u32 rf; /* 0x08 efuse redundancy bit used register */
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u32 _rsvd0;
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u32 jtag_pass; /* 0x10 JTAG password */
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u32 strobe_finish_ctrl;
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/* 0x14 efuse strobe finish control register */
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};
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struct rockchip_efuse_platdata {
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void __iomem *base;
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struct clk *clk;
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};
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#if defined(DEBUG)
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static int dump_efuses(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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/*
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* N.B.: This function is tailored towards the RK3399 and assumes that
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* there's always 32 fuses x 32 bits (i.e. 128 bytes of data) to
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* be read.
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*/
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struct udevice *dev;
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u8 fuses[128];
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int ret;
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/* retrieve the device */
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ret = uclass_get_device_by_driver(UCLASS_MISC,
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DM_GET_DRIVER(rockchip_efuse), &dev);
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if (ret) {
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printf("%s: no misc-device found\n", __func__);
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return 0;
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}
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ret = misc_read(dev, 0, &fuses, sizeof(fuses));
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if (ret) {
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printf("%s: misc_read failed\n", __func__);
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return 0;
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}
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printf("efuse-contents:\n");
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print_buffer(0, fuses, 1, 128, 16);
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return 0;
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}
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U_BOOT_CMD(
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rk3399_dump_efuses, 1, 1, dump_efuses,
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"Dump the content of the efuses",
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""
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);
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#endif
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static int rockchip_rk3399_efuse_read(struct udevice *dev, int offset,
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void *buf, int size)
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{
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struct rockchip_efuse_platdata *plat = dev_get_platdata(dev);
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struct rockchip_efuse_regs *efuse =
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(struct rockchip_efuse_regs *)plat->base;
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unsigned int addr_start, addr_end, addr_offset;
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u32 out_value;
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u8 bytes[RK3399_NFUSES * RK3399_BYTES_PER_FUSE];
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int i = 0;
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u32 addr;
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addr_start = offset / RK3399_BYTES_PER_FUSE;
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addr_offset = offset % RK3399_BYTES_PER_FUSE;
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addr_end = DIV_ROUND_UP(offset + size, RK3399_BYTES_PER_FUSE);
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/* cap to the size of the efuse block */
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if (addr_end > RK3399_NFUSES)
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addr_end = RK3399_NFUSES;
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writel(RK3399_LOAD | RK3399_PGENB | RK3399_STROBSFTSEL | RK3399_RSB,
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&efuse->ctrl);
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udelay(1);
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for (addr = addr_start; addr < addr_end; addr++) {
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setbits_le32(&efuse->ctrl,
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RK3399_STROBE | (addr << RK3399_A_SHIFT));
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udelay(1);
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out_value = readl(&efuse->dout);
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clrbits_le32(&efuse->ctrl, RK3399_STROBE);
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udelay(1);
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memcpy(&bytes[i], &out_value, RK3399_BYTES_PER_FUSE);
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i += RK3399_BYTES_PER_FUSE;
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}
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/* Switch to standby mode */
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writel(RK3399_PD | RK3399_CSB, &efuse->ctrl);
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memcpy(buf, bytes + addr_offset, size);
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return 0;
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}
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static int rockchip_efuse_read(struct udevice *dev, int offset,
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void *buf, int size)
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{
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return rockchip_rk3399_efuse_read(dev, offset, buf, size);
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}
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static const struct misc_ops rockchip_efuse_ops = {
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.read = rockchip_efuse_read,
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};
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static int rockchip_efuse_ofdata_to_platdata(struct udevice *dev)
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{
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struct rockchip_efuse_platdata *plat = dev_get_platdata(dev);
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plat->base = dev_read_addr_ptr(dev);
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return 0;
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}
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static const struct udevice_id rockchip_efuse_ids[] = {
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{ .compatible = "rockchip,rk3399-efuse" },
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{}
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};
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U_BOOT_DRIVER(rockchip_efuse) = {
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.name = "rockchip_efuse",
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.id = UCLASS_MISC,
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.of_match = rockchip_efuse_ids,
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.ofdata_to_platdata = rockchip_efuse_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct rockchip_efuse_platdata),
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.ops = &rockchip_efuse_ops,
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};
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