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[u-boot] / drivers / misc / rockchip-efuse.c
1 /*
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
31 struct 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
41 struct rockchip_efuse_platdata {
42         void __iomem *base;
43         struct clk *clk;
44 };
45
46 #if defined(DEBUG)
47 static 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
80 U_BOOT_CMD(
81         rk3399_dump_efuses, 1, 1, dump_efuses,
82         "Dump the content of the efuses",
83         ""
84 );
85 #endif
86
87 static 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
131 static 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
137 static const struct misc_ops rockchip_efuse_ops = {
138         .read = rockchip_efuse_read,
139 };
140
141 static int rockchip_efuse_ofdata_to_platdata(struct udevice *dev)
142 {
143         struct rockchip_efuse_platdata *plat = dev_get_platdata(dev);
144
145         plat->base = dev_read_addr_ptr(dev);
146         return 0;
147 }
148
149 static const struct udevice_id rockchip_efuse_ids[] = {
150         { .compatible = "rockchip,rk3399-efuse" },
151         {}
152 };
153
154 U_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 };