302 lines
7.6 KiB
C
302 lines
7.6 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
/*
|
||
|
* Rockchip eFuse Driver
|
||
|
*
|
||
|
* Copyright (c) 2015 Rockchip Electronics Co. Ltd.
|
||
|
* Author: Caesar Wang <wxt@rock-chips.com>
|
||
|
*/
|
||
|
|
||
|
#include <linux/clk.h>
|
||
|
#include <linux/delay.h>
|
||
|
#include <linux/device.h>
|
||
|
#include <linux/io.h>
|
||
|
#include <linux/module.h>
|
||
|
#include <linux/nvmem-provider.h>
|
||
|
#include <linux/slab.h>
|
||
|
#include <linux/of.h>
|
||
|
#include <linux/of_platform.h>
|
||
|
#include <linux/platform_device.h>
|
||
|
|
||
|
#define RK3288_A_SHIFT 6
|
||
|
#define RK3288_A_MASK 0x3ff
|
||
|
#define RK3288_PGENB BIT(3)
|
||
|
#define RK3288_LOAD BIT(2)
|
||
|
#define RK3288_STROBE BIT(1)
|
||
|
#define RK3288_CSB BIT(0)
|
||
|
|
||
|
#define RK3328_SECURE_SIZES 96
|
||
|
#define RK3328_INT_STATUS 0x0018
|
||
|
#define RK3328_DOUT 0x0020
|
||
|
#define RK3328_AUTO_CTRL 0x0024
|
||
|
#define RK3328_INT_FINISH BIT(0)
|
||
|
#define RK3328_AUTO_ENB BIT(0)
|
||
|
#define RK3328_AUTO_RD BIT(1)
|
||
|
|
||
|
#define RK3399_A_SHIFT 16
|
||
|
#define RK3399_A_MASK 0x3ff
|
||
|
#define RK3399_NBYTES 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)
|
||
|
|
||
|
#define REG_EFUSE_CTRL 0x0000
|
||
|
#define REG_EFUSE_DOUT 0x0004
|
||
|
|
||
|
struct rockchip_efuse_chip {
|
||
|
struct device *dev;
|
||
|
void __iomem *base;
|
||
|
struct clk *clk;
|
||
|
};
|
||
|
|
||
|
static int rockchip_rk3288_efuse_read(void *context, unsigned int offset,
|
||
|
void *val, size_t bytes)
|
||
|
{
|
||
|
struct rockchip_efuse_chip *efuse = context;
|
||
|
u8 *buf = val;
|
||
|
int ret;
|
||
|
|
||
|
ret = clk_prepare_enable(efuse->clk);
|
||
|
if (ret < 0) {
|
||
|
dev_err(efuse->dev, "failed to prepare/enable efuse clk\n");
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
writel(RK3288_LOAD | RK3288_PGENB, efuse->base + REG_EFUSE_CTRL);
|
||
|
udelay(1);
|
||
|
while (bytes--) {
|
||
|
writel(readl(efuse->base + REG_EFUSE_CTRL) &
|
||
|
(~(RK3288_A_MASK << RK3288_A_SHIFT)),
|
||
|
efuse->base + REG_EFUSE_CTRL);
|
||
|
writel(readl(efuse->base + REG_EFUSE_CTRL) |
|
||
|
((offset++ & RK3288_A_MASK) << RK3288_A_SHIFT),
|
||
|
efuse->base + REG_EFUSE_CTRL);
|
||
|
udelay(1);
|
||
|
writel(readl(efuse->base + REG_EFUSE_CTRL) |
|
||
|
RK3288_STROBE, efuse->base + REG_EFUSE_CTRL);
|
||
|
udelay(1);
|
||
|
*buf++ = readb(efuse->base + REG_EFUSE_DOUT);
|
||
|
writel(readl(efuse->base + REG_EFUSE_CTRL) &
|
||
|
(~RK3288_STROBE), efuse->base + REG_EFUSE_CTRL);
|
||
|
udelay(1);
|
||
|
}
|
||
|
|
||
|
/* Switch to standby mode */
|
||
|
writel(RK3288_PGENB | RK3288_CSB, efuse->base + REG_EFUSE_CTRL);
|
||
|
|
||
|
clk_disable_unprepare(efuse->clk);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int rockchip_rk3328_efuse_read(void *context, unsigned int offset,
|
||
|
void *val, size_t bytes)
|
||
|
{
|
||
|
struct rockchip_efuse_chip *efuse = context;
|
||
|
unsigned int addr_start, addr_end, addr_offset, addr_len;
|
||
|
u32 out_value, status;
|
||
|
u8 *buf;
|
||
|
int ret, i = 0;
|
||
|
|
||
|
ret = clk_prepare_enable(efuse->clk);
|
||
|
if (ret < 0) {
|
||
|
dev_err(efuse->dev, "failed to prepare/enable efuse clk\n");
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/* 128 Byte efuse, 96 Byte for secure, 32 Byte for non-secure */
|
||
|
offset += RK3328_SECURE_SIZES;
|
||
|
addr_start = rounddown(offset, RK3399_NBYTES) / RK3399_NBYTES;
|
||
|
addr_end = roundup(offset + bytes, RK3399_NBYTES) / RK3399_NBYTES;
|
||
|
addr_offset = offset % RK3399_NBYTES;
|
||
|
addr_len = addr_end - addr_start;
|
||
|
|
||
|
buf = kzalloc(array3_size(addr_len, RK3399_NBYTES, sizeof(*buf)),
|
||
|
GFP_KERNEL);
|
||
|
if (!buf) {
|
||
|
ret = -ENOMEM;
|
||
|
goto nomem;
|
||
|
}
|
||
|
|
||
|
while (addr_len--) {
|
||
|
writel(RK3328_AUTO_RD | RK3328_AUTO_ENB |
|
||
|
((addr_start++ & RK3399_A_MASK) << RK3399_A_SHIFT),
|
||
|
efuse->base + RK3328_AUTO_CTRL);
|
||
|
udelay(4);
|
||
|
status = readl(efuse->base + RK3328_INT_STATUS);
|
||
|
if (!(status & RK3328_INT_FINISH)) {
|
||
|
ret = -EIO;
|
||
|
goto err;
|
||
|
}
|
||
|
out_value = readl(efuse->base + RK3328_DOUT);
|
||
|
writel(RK3328_INT_FINISH, efuse->base + RK3328_INT_STATUS);
|
||
|
|
||
|
memcpy(&buf[i], &out_value, RK3399_NBYTES);
|
||
|
i += RK3399_NBYTES;
|
||
|
}
|
||
|
|
||
|
memcpy(val, buf + addr_offset, bytes);
|
||
|
err:
|
||
|
kfree(buf);
|
||
|
nomem:
|
||
|
clk_disable_unprepare(efuse->clk);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int rockchip_rk3399_efuse_read(void *context, unsigned int offset,
|
||
|
void *val, size_t bytes)
|
||
|
{
|
||
|
struct rockchip_efuse_chip *efuse = context;
|
||
|
unsigned int addr_start, addr_end, addr_offset, addr_len;
|
||
|
u32 out_value;
|
||
|
u8 *buf;
|
||
|
int ret, i = 0;
|
||
|
|
||
|
ret = clk_prepare_enable(efuse->clk);
|
||
|
if (ret < 0) {
|
||
|
dev_err(efuse->dev, "failed to prepare/enable efuse clk\n");
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
addr_start = rounddown(offset, RK3399_NBYTES) / RK3399_NBYTES;
|
||
|
addr_end = roundup(offset + bytes, RK3399_NBYTES) / RK3399_NBYTES;
|
||
|
addr_offset = offset % RK3399_NBYTES;
|
||
|
addr_len = addr_end - addr_start;
|
||
|
|
||
|
buf = kzalloc(array3_size(addr_len, RK3399_NBYTES, sizeof(*buf)),
|
||
|
GFP_KERNEL);
|
||
|
if (!buf) {
|
||
|
clk_disable_unprepare(efuse->clk);
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
|
||
|
writel(RK3399_LOAD | RK3399_PGENB | RK3399_STROBSFTSEL | RK3399_RSB,
|
||
|
efuse->base + REG_EFUSE_CTRL);
|
||
|
udelay(1);
|
||
|
while (addr_len--) {
|
||
|
writel(readl(efuse->base + REG_EFUSE_CTRL) | RK3399_STROBE |
|
||
|
((addr_start++ & RK3399_A_MASK) << RK3399_A_SHIFT),
|
||
|
efuse->base + REG_EFUSE_CTRL);
|
||
|
udelay(1);
|
||
|
out_value = readl(efuse->base + REG_EFUSE_DOUT);
|
||
|
writel(readl(efuse->base + REG_EFUSE_CTRL) & (~RK3399_STROBE),
|
||
|
efuse->base + REG_EFUSE_CTRL);
|
||
|
udelay(1);
|
||
|
|
||
|
memcpy(&buf[i], &out_value, RK3399_NBYTES);
|
||
|
i += RK3399_NBYTES;
|
||
|
}
|
||
|
|
||
|
/* Switch to standby mode */
|
||
|
writel(RK3399_PD | RK3399_CSB, efuse->base + REG_EFUSE_CTRL);
|
||
|
|
||
|
memcpy(val, buf + addr_offset, bytes);
|
||
|
|
||
|
kfree(buf);
|
||
|
|
||
|
clk_disable_unprepare(efuse->clk);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct nvmem_config econfig = {
|
||
|
.name = "rockchip-efuse",
|
||
|
.stride = 1,
|
||
|
.word_size = 1,
|
||
|
.read_only = true,
|
||
|
};
|
||
|
|
||
|
static const struct of_device_id rockchip_efuse_match[] = {
|
||
|
/* deprecated but kept around for dts binding compatibility */
|
||
|
{
|
||
|
.compatible = "rockchip,rockchip-efuse",
|
||
|
.data = (void *)&rockchip_rk3288_efuse_read,
|
||
|
},
|
||
|
{
|
||
|
.compatible = "rockchip,rk3066a-efuse",
|
||
|
.data = (void *)&rockchip_rk3288_efuse_read,
|
||
|
},
|
||
|
{
|
||
|
.compatible = "rockchip,rk3188-efuse",
|
||
|
.data = (void *)&rockchip_rk3288_efuse_read,
|
||
|
},
|
||
|
{
|
||
|
.compatible = "rockchip,rk3228-efuse",
|
||
|
.data = (void *)&rockchip_rk3288_efuse_read,
|
||
|
},
|
||
|
{
|
||
|
.compatible = "rockchip,rk3288-efuse",
|
||
|
.data = (void *)&rockchip_rk3288_efuse_read,
|
||
|
},
|
||
|
{
|
||
|
.compatible = "rockchip,rk3368-efuse",
|
||
|
.data = (void *)&rockchip_rk3288_efuse_read,
|
||
|
},
|
||
|
{
|
||
|
.compatible = "rockchip,rk3328-efuse",
|
||
|
.data = (void *)&rockchip_rk3328_efuse_read,
|
||
|
},
|
||
|
{
|
||
|
.compatible = "rockchip,rk3399-efuse",
|
||
|
.data = (void *)&rockchip_rk3399_efuse_read,
|
||
|
},
|
||
|
{ /* sentinel */},
|
||
|
};
|
||
|
MODULE_DEVICE_TABLE(of, rockchip_efuse_match);
|
||
|
|
||
|
static int rockchip_efuse_probe(struct platform_device *pdev)
|
||
|
{
|
||
|
struct resource *res;
|
||
|
struct nvmem_device *nvmem;
|
||
|
struct rockchip_efuse_chip *efuse;
|
||
|
const void *data;
|
||
|
struct device *dev = &pdev->dev;
|
||
|
|
||
|
data = of_device_get_match_data(dev);
|
||
|
if (!data) {
|
||
|
dev_err(dev, "failed to get match data\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
efuse = devm_kzalloc(dev, sizeof(struct rockchip_efuse_chip),
|
||
|
GFP_KERNEL);
|
||
|
if (!efuse)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||
|
efuse->base = devm_ioremap_resource(dev, res);
|
||
|
if (IS_ERR(efuse->base))
|
||
|
return PTR_ERR(efuse->base);
|
||
|
|
||
|
efuse->clk = devm_clk_get(dev, "pclk_efuse");
|
||
|
if (IS_ERR(efuse->clk))
|
||
|
return PTR_ERR(efuse->clk);
|
||
|
|
||
|
efuse->dev = dev;
|
||
|
if (of_property_read_u32(dev->of_node, "rockchip,efuse-size",
|
||
|
&econfig.size))
|
||
|
econfig.size = resource_size(res);
|
||
|
econfig.reg_read = data;
|
||
|
econfig.priv = efuse;
|
||
|
econfig.dev = efuse->dev;
|
||
|
nvmem = devm_nvmem_register(dev, &econfig);
|
||
|
|
||
|
return PTR_ERR_OR_ZERO(nvmem);
|
||
|
}
|
||
|
|
||
|
static struct platform_driver rockchip_efuse_driver = {
|
||
|
.probe = rockchip_efuse_probe,
|
||
|
.driver = {
|
||
|
.name = "rockchip-efuse",
|
||
|
.of_match_table = rockchip_efuse_match,
|
||
|
},
|
||
|
};
|
||
|
|
||
|
module_platform_driver(rockchip_efuse_driver);
|
||
|
MODULE_DESCRIPTION("rockchip_efuse driver");
|
||
|
MODULE_LICENSE("GPL v2");
|