1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * arch/arm/cpu/armv7/rmobile/cpu_info-rcar.c
4 *
5 * Copyright (C) 2013,2014 Renesas Electronics Corporation
6 */
7 #include <common.h>
8 #include <asm/io.h>
9
10 #define PRR_MASK 0x7fff
11 #define R8A7796_REV_1_0 0x5200
12 #define R8A7796_REV_1_1 0x5210
13
14 static u32 rmobile_get_prr(void);
15
rmobile_get_cpu_type(void)16 u32 rmobile_get_cpu_type(void)
17 {
18 return (rmobile_get_prr() & 0x00007F00) >> 8;
19 }
20
rmobile_get_cpu_rev_integer(void)21 u32 rmobile_get_cpu_rev_integer(void)
22 {
23 const u32 prr = rmobile_get_prr();
24
25 if ((prr & PRR_MASK) == R8A7796_REV_1_1)
26 return 1;
27 else
28 return ((prr & 0x000000F0) >> 4) + 1;
29 }
30
rmobile_get_cpu_rev_fraction(void)31 u32 rmobile_get_cpu_rev_fraction(void)
32 {
33 const u32 prr = rmobile_get_prr();
34
35 if ((prr & PRR_MASK) == R8A7796_REV_1_1)
36 return 1;
37 else
38 return prr & 0x0000000F;
39 }
40
41 #if !CONFIG_IS_ENABLED(DM) || !CONFIG_IS_ENABLED(SYSCON)
rmobile_get_prr(void)42 static u32 rmobile_get_prr(void)
43 {
44 /*
45 * On RCar/RMobile Gen2 and older systems, the PRR is always
46 * located at the address below. On newer systems, the PRR
47 * may be located at different address, but that information
48 * is obtained from DT. This code will be removed when all
49 * of the older systems get converted to DM and OF control.
50 */
51 return readl(0xFF000044);
52 }
53 #else
54
55 #include <dm.h>
56 #include <syscon.h>
57 #include <regmap.h>
58
59 struct renesas_prr_priv {
60 fdt_addr_t regs;
61 };
62
63 enum {
64 PRR_RCAR,
65 };
66
rmobile_get_prr(void)67 static u32 rmobile_get_prr(void)
68 {
69 struct regmap *map;
70
71 map = syscon_get_regmap_by_driver_data(PRR_RCAR);
72 if (!map) {
73 printf("PRR regmap failed!\n");
74 hang();
75 }
76
77 return readl(map->ranges[0].start);
78 }
79
80 static const struct udevice_id renesas_prr_ids[] = {
81 { .compatible = "renesas,prr", .data = PRR_RCAR },
82 { }
83 };
84
85 U_BOOT_DRIVER(renesas_prr) = {
86 .name = "renesas_prr",
87 .id = UCLASS_SYSCON,
88 .of_match = renesas_prr_ids,
89 .flags = DM_FLAG_PRE_RELOC,
90 };
91 #endif
92