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Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Philipp Tomsich49cd8e82017-05-05 19:21:38 +02002/*
3 * eFuse driver for Rockchip devices
4 *
5 * Copyright 2017, Theobroma Systems Design und Consulting GmbH
6 * Written by Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Philipp Tomsich49cd8e82017-05-05 19:21:38 +02007 */
8
9#include <common.h>
10#include <asm/io.h>
11#include <command.h>
12#include <display_options.h>
13#include <dm.h>
14#include <linux/bitops.h>
15#include <linux/delay.h>
16#include <misc.h>
17
18#define RK3399_A_SHIFT 16
19#define RK3399_A_MASK 0x3ff
20#define RK3399_NFUSES 32
21#define RK3399_BYTES_PER_FUSE 4
22#define RK3399_STROBSFTSEL BIT(9)
23#define RK3399_RSB BIT(7)
24#define RK3399_PD BIT(5)
25#define RK3399_PGENB BIT(3)
26#define RK3399_LOAD BIT(2)
27#define RK3399_STROBE BIT(1)
28#define RK3399_CSB BIT(0)
29
30struct rockchip_efuse_regs {
31 u32 ctrl; /* 0x00 efuse control register */
32 u32 dout; /* 0x04 efuse data out register */
33 u32 rf; /* 0x08 efuse redundancy bit used register */
34 u32 _rsvd0;
35 u32 jtag_pass; /* 0x10 JTAG password */
36 u32 strobe_finish_ctrl;
37 /* 0x14 efuse strobe finish control register */
38};
39
40struct rockchip_efuse_platdata {
41 void __iomem *base;
42 struct clk *clk;
43};
44
45#if defined(DEBUG)
Simon Glass09140112020-05-10 11:40:03 -060046static int dump_efuses(struct cmd_tbl *cmdtp, int flag,
47 int argc, char *const argv[])
Philipp Tomsich49cd8e82017-05-05 19:21:38 +020048{
49 /*
50 * N.B.: This function is tailored towards the RK3399 and assumes that
51 * there's always 32 fuses x 32 bits (i.e. 128 bytes of data) to
52 * be read.
53 */
54
55 struct udevice *dev;
56 u8 fuses[128];
57 int ret;
58
59 /* retrieve the device */
60 ret = uclass_get_device_by_driver(UCLASS_MISC,
61 DM_GET_DRIVER(rockchip_efuse), &dev);
62 if (ret) {
63 printf("%s: no misc-device found\n", __func__);
64 return 0;
65 }
66
67 ret = misc_read(dev, 0, &fuses, sizeof(fuses));
Simon Glass8729b1a2018-11-06 15:21:39 -070068 if (ret < 0) {
Philipp Tomsich49cd8e82017-05-05 19:21:38 +020069 printf("%s: misc_read failed\n", __func__);
70 return 0;
71 }
72
73 printf("efuse-contents:\n");
74 print_buffer(0, fuses, 1, 128, 16);
75
76 return 0;
77}
78
79U_BOOT_CMD(
80 rk3399_dump_efuses, 1, 1, dump_efuses,
81 "Dump the content of the efuses",
82 ""
83);
84#endif
85
86static int rockchip_rk3399_efuse_read(struct udevice *dev, int offset,
87 void *buf, int size)
88{
89 struct rockchip_efuse_platdata *plat = dev_get_platdata(dev);
90 struct rockchip_efuse_regs *efuse =
91 (struct rockchip_efuse_regs *)plat->base;
92
93 unsigned int addr_start, addr_end, addr_offset;
94 u32 out_value;
95 u8 bytes[RK3399_NFUSES * RK3399_BYTES_PER_FUSE];
96 int i = 0;
97 u32 addr;
98
99 addr_start = offset / RK3399_BYTES_PER_FUSE;
100 addr_offset = offset % RK3399_BYTES_PER_FUSE;
101 addr_end = DIV_ROUND_UP(offset + size, RK3399_BYTES_PER_FUSE);
102
103 /* cap to the size of the efuse block */
104 if (addr_end > RK3399_NFUSES)
105 addr_end = RK3399_NFUSES;
106
107 writel(RK3399_LOAD | RK3399_PGENB | RK3399_STROBSFTSEL | RK3399_RSB,
108 &efuse->ctrl);
109 udelay(1);
110 for (addr = addr_start; addr < addr_end; addr++) {
111 setbits_le32(&efuse->ctrl,
112 RK3399_STROBE | (addr << RK3399_A_SHIFT));
113 udelay(1);
114 out_value = readl(&efuse->dout);
115 clrbits_le32(&efuse->ctrl, RK3399_STROBE);
116 udelay(1);
117
118 memcpy(&bytes[i], &out_value, RK3399_BYTES_PER_FUSE);
119 i += RK3399_BYTES_PER_FUSE;
120 }
121
122 /* Switch to standby mode */
123 writel(RK3399_PD | RK3399_CSB, &efuse->ctrl);
124
125 memcpy(buf, bytes + addr_offset, size);
126
127 return 0;
128}
129
130static int rockchip_efuse_read(struct udevice *dev, int offset,
131 void *buf, int size)
132{
133 return rockchip_rk3399_efuse_read(dev, offset, buf, size);
134}
135
136static const struct misc_ops rockchip_efuse_ops = {
137 .read = rockchip_efuse_read,
138};
139
140static int rockchip_efuse_ofdata_to_platdata(struct udevice *dev)
141{
142 struct rockchip_efuse_platdata *plat = dev_get_platdata(dev);
143
Philipp Tomsichf6230a02017-09-12 17:32:26 +0200144 plat->base = dev_read_addr_ptr(dev);
Philipp Tomsich49cd8e82017-05-05 19:21:38 +0200145 return 0;
146}
147
148static const struct udevice_id rockchip_efuse_ids[] = {
149 { .compatible = "rockchip,rk3399-efuse" },
150 {}
151};
152
153U_BOOT_DRIVER(rockchip_efuse) = {
154 .name = "rockchip_efuse",
155 .id = UCLASS_MISC,
156 .of_match = rockchip_efuse_ids,
157 .ofdata_to_platdata = rockchip_efuse_ofdata_to_platdata,
158 .platdata_auto_alloc_size = sizeof(struct rockchip_efuse_platdata),
159 .ops = &rockchip_efuse_ops,
160};