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