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// SPDX-License-Identifier: GPL-2.0+
/*
* eFuse driver for Rockchip devices
*
* Copyright 2017, Theobroma Systems Design und Consulting GmbH
* Written by Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
*/
#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 <malloc.h>
#include <misc.h>
#define EFUSE_CTRL 0x0000
#define RK3399_A_SHIFT 16
#define RK3399_A_MASK GENMASK(25, 16)
#define RK3399_ADDR(n) ((n) << RK3399_A_SHIFT)
#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)
#define EFUSE_DOUT 0x0004
struct rockchip_efuse_plat {
void __iomem *base;
};
struct rockchip_efuse_data {
int (*read)(struct udevice *dev, int offset, void *buf, int size);
int size;
int block_size;
};
#if defined(DEBUG)
static int dump_efuse(struct cmd_tbl *cmdtp, int flag,
int argc, char *const argv[])
{
struct udevice *dev;
u8 data[4];
int ret, i;
ret = uclass_get_device_by_driver(UCLASS_MISC,
DM_DRIVER_GET(rockchip_efuse), &dev);
if (ret) {
printf("%s: no misc-device found\n", __func__);
return 0;
}
for (i = 0; true; i += sizeof(data)) {
ret = misc_read(dev, i, &data, sizeof(data));
if (ret < 0)
return 0;
print_buffer(i, data, 1, sizeof(data), sizeof(data));
}
return 0;
}
U_BOOT_CMD(
dump_efuse, 1, 1, dump_efuse,
"Dump the content of the efuse",
""
);
#endif
static int rockchip_rk3399_efuse_read(struct udevice *dev, int offset,
void *buf, int size)
{
struct rockchip_efuse_plat *efuse = dev_get_plat(dev);
u32 *buffer = buf;
/* Switch to array read mode */
writel(RK3399_LOAD | RK3399_PGENB | RK3399_STROBSFTSEL | RK3399_RSB,
efuse->base + EFUSE_CTRL);
udelay(1);
while (size--) {
setbits_le32(efuse->base + EFUSE_CTRL,
RK3399_STROBE | RK3399_ADDR(offset++));
udelay(1);
*buffer++ = readl(efuse->base + EFUSE_DOUT);
clrbits_le32(efuse->base + EFUSE_CTRL, RK3399_STROBE);
udelay(1);
}
/* Switch to power-down mode */
writel(RK3399_PD | RK3399_CSB, efuse->base + EFUSE_CTRL);
return 0;
}
static int rockchip_efuse_read(struct udevice *dev, int offset,
void *buf, int size)
{
const struct rockchip_efuse_data *data =
(void *)dev_get_driver_data(dev);
u32 block_start, block_end, block_offset, blocks;
u8 *buffer;
int ret;
if (offset < 0 || !buf || size <= 0 || offset + size > data->size)
return -EINVAL;
if (!data->read)
return -ENOSYS;
if (data->block_size <= 1)
return data->read(dev, offset, buf, size);
block_start = offset / data->block_size;
block_offset = offset % data->block_size;
block_end = DIV_ROUND_UP(offset + size, data->block_size);
blocks = block_end - block_start;
buffer = calloc(blocks, data->block_size);
if (!buffer)
return -ENOMEM;
ret = data->read(dev, block_start, buffer, blocks);
if (!ret)
memcpy(buf, buffer + block_offset, size);
free(buffer);
return ret;
}
static const struct misc_ops rockchip_efuse_ops = {
.read = rockchip_efuse_read,
};
static int rockchip_efuse_of_to_plat(struct udevice *dev)
{
struct rockchip_efuse_plat *plat = dev_get_plat(dev);
plat->base = dev_read_addr_ptr(dev);
return 0;
}
static const struct rockchip_efuse_data rk3399_data = {
.read = rockchip_rk3399_efuse_read,
.size = 0x80,
.block_size = 4,
};
static const struct udevice_id rockchip_efuse_ids[] = {
{
.compatible = "rockchip,rk3399-efuse",
.data = (ulong)&rk3399_data,
},
{}
};
U_BOOT_DRIVER(rockchip_efuse) = {
.name = "rockchip_efuse",
.id = UCLASS_MISC,
.of_match = rockchip_efuse_ids,
.of_to_plat = rockchip_efuse_of_to_plat,
.plat_auto = sizeof(struct rockchip_efuse_plat),
.ops = &rockchip_efuse_ops,
};
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