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Philipp Tomsich49cd8e82017-05-05 19:21:38 +02001/*
2 * eFuse driver for Rockchip devices
3 *
4 * Copyright 2017, Theobroma Systems Design und Consulting GmbH
5 * Written by Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
6 *
7 * SPDX-License-Identifier: GPL-2.0+
8 */
9
10#include <common.h>
11#include <asm/io.h>
12#include <command.h>
13#include <display_options.h>
14#include <dm.h>
15#include <linux/bitops.h>
16#include <linux/delay.h>
17#include <misc.h>
18
19#define RK3399_A_SHIFT 16
20#define RK3399_A_MASK 0x3ff
21#define RK3399_NFUSES 32
22#define RK3399_BYTES_PER_FUSE 4
23#define RK3399_STROBSFTSEL BIT(9)
24#define RK3399_RSB BIT(7)
25#define RK3399_PD BIT(5)
26#define RK3399_PGENB BIT(3)
27#define RK3399_LOAD BIT(2)
28#define RK3399_STROBE BIT(1)
29#define RK3399_CSB BIT(0)
30
31struct rockchip_efuse_regs {
32 u32 ctrl; /* 0x00 efuse control register */
33 u32 dout; /* 0x04 efuse data out register */
34 u32 rf; /* 0x08 efuse redundancy bit used register */
35 u32 _rsvd0;
36 u32 jtag_pass; /* 0x10 JTAG password */
37 u32 strobe_finish_ctrl;
38 /* 0x14 efuse strobe finish control register */
39};
40
41struct rockchip_efuse_platdata {
42 void __iomem *base;
43 struct clk *clk;
44};
45
46#if defined(DEBUG)
47static int dump_efuses(cmd_tbl_t *cmdtp, int flag,
48 int argc, char * const argv[])
49{
50 /*
51 * N.B.: This function is tailored towards the RK3399 and assumes that
52 * there's always 32 fuses x 32 bits (i.e. 128 bytes of data) to
53 * be read.
54 */
55
56 struct udevice *dev;
57 u8 fuses[128];
58 int ret;
59
60 /* retrieve the device */
61 ret = uclass_get_device_by_driver(UCLASS_MISC,
62 DM_GET_DRIVER(rockchip_efuse), &dev);
63 if (ret) {
64 printf("%s: no misc-device found\n", __func__);
65 return 0;
66 }
67
68 ret = misc_read(dev, 0, &fuses, sizeof(fuses));
69 if (ret) {
70 printf("%s: misc_read failed\n", __func__);
71 return 0;
72 }
73
74 printf("efuse-contents:\n");
75 print_buffer(0, fuses, 1, 128, 16);
76
77 return 0;
78}
79
80U_BOOT_CMD(
81 rk3399_dump_efuses, 1, 1, dump_efuses,
82 "Dump the content of the efuses",
83 ""
84);
85#endif
86
87static int rockchip_rk3399_efuse_read(struct udevice *dev, int offset,
88 void *buf, int size)
89{
90 struct rockchip_efuse_platdata *plat = dev_get_platdata(dev);
91 struct rockchip_efuse_regs *efuse =
92 (struct rockchip_efuse_regs *)plat->base;
93
94 unsigned int addr_start, addr_end, addr_offset;
95 u32 out_value;
96 u8 bytes[RK3399_NFUSES * RK3399_BYTES_PER_FUSE];
97 int i = 0;
98 u32 addr;
99
100 addr_start = offset / RK3399_BYTES_PER_FUSE;
101 addr_offset = offset % RK3399_BYTES_PER_FUSE;
102 addr_end = DIV_ROUND_UP(offset + size, RK3399_BYTES_PER_FUSE);
103
104 /* cap to the size of the efuse block */
105 if (addr_end > RK3399_NFUSES)
106 addr_end = RK3399_NFUSES;
107
108 writel(RK3399_LOAD | RK3399_PGENB | RK3399_STROBSFTSEL | RK3399_RSB,
109 &efuse->ctrl);
110 udelay(1);
111 for (addr = addr_start; addr < addr_end; addr++) {
112 setbits_le32(&efuse->ctrl,
113 RK3399_STROBE | (addr << RK3399_A_SHIFT));
114 udelay(1);
115 out_value = readl(&efuse->dout);
116 clrbits_le32(&efuse->ctrl, RK3399_STROBE);
117 udelay(1);
118
119 memcpy(&bytes[i], &out_value, RK3399_BYTES_PER_FUSE);
120 i += RK3399_BYTES_PER_FUSE;
121 }
122
123 /* Switch to standby mode */
124 writel(RK3399_PD | RK3399_CSB, &efuse->ctrl);
125
126 memcpy(buf, bytes + addr_offset, size);
127
128 return 0;
129}
130
131static int rockchip_efuse_read(struct udevice *dev, int offset,
132 void *buf, int size)
133{
134 return rockchip_rk3399_efuse_read(dev, offset, buf, size);
135}
136
137static const struct misc_ops rockchip_efuse_ops = {
138 .read = rockchip_efuse_read,
139};
140
141static int rockchip_efuse_ofdata_to_platdata(struct udevice *dev)
142{
143 struct rockchip_efuse_platdata *plat = dev_get_platdata(dev);
144
Philipp Tomsichf6230a02017-09-12 17:32:26 +0200145 plat->base = dev_read_addr_ptr(dev);
Philipp Tomsich49cd8e82017-05-05 19:21:38 +0200146 return 0;
147}
148
149static const struct udevice_id rockchip_efuse_ids[] = {
150 { .compatible = "rockchip,rk3399-efuse" },
151 {}
152};
153
154U_BOOT_DRIVER(rockchip_efuse) = {
155 .name = "rockchip_efuse",
156 .id = UCLASS_MISC,
157 .of_match = rockchip_efuse_ids,
158 .ofdata_to_platdata = rockchip_efuse_ofdata_to_platdata,
159 .platdata_auto_alloc_size = sizeof(struct rockchip_efuse_platdata),
160 .ops = &rockchip_efuse_ops,
161};