xref: /linux/arch/arm/mach-shmobile/pm-rcar-gen2.c (revision 0ea5c948cb64bab5bc7a5516774eb8536f05aa0d)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * R-Car Generation 2 Power management support
4  *
5  * Copyright (C) 2013 - 2015  Renesas Electronics Corporation
6  * Copyright (C) 2011  Renesas Solutions Corp.
7  * Copyright (C) 2011  Magnus Damm
8  */
9 
10 #include <linux/kernel.h>
11 #include <linux/ioport.h>
12 #include <linux/of.h>
13 #include <linux/of_address.h>
14 #include <linux/smp.h>
15 #include <asm/io.h>
16 #include <asm/cputype.h>
17 #include "common.h"
18 #include "rcar-gen2.h"
19 
20 /* RST */
21 #define RST		0xe6160000
22 
23 #define CA15BAR		0x0020		/* CA15 Boot Address Register */
24 #define CA7BAR		0x0030		/* CA7 Boot Address Register */
25 #define CA15RESCNT	0x0040		/* CA15 Reset Control Register */
26 #define CA7RESCNT	0x0044		/* CA7 Reset Control Register */
27 
28 /* SYS Boot Address Register */
29 #define SBAR_BAREN	BIT(4)		/* SBAR is valid */
30 
31 /* Reset Control Registers */
32 #define CA15RESCNT_CODE	0xa5a50000
33 #define CA15RESCNT_CPUS	0xf		/* CPU0-3 */
34 #define CA7RESCNT_CODE	0x5a5a0000
35 #define CA7RESCNT_CPUS	0xf		/* CPU0-3 */
36 
37 /* On-chip RAM */
38 #define ICRAM1		0xe63c0000	/* Inter Connect RAM1 (4 KiB) */
39 
phys_to_sbar(phys_addr_t addr)40 static inline u32 phys_to_sbar(phys_addr_t addr)
41 {
42 	return (addr >> 8) & 0xfffffc00;
43 }
44 
rcar_gen2_pm_init(void)45 void __init rcar_gen2_pm_init(void)
46 {
47 	void __iomem *p;
48 	u32 bar;
49 	struct device_node *np;
50 	bool has_a7 = false;
51 	bool has_a15 = false;
52 	struct resource res;
53 	int error;
54 
55 	if (!request_mem_region(0, SZ_256K, "Boot Area")) {
56 		pr_err("Failed to request boot area\n");
57 		return;
58 	}
59 
60 	for_each_of_cpu_node(np) {
61 		if (of_device_is_compatible(np, "arm,cortex-a15"))
62 			has_a15 = true;
63 		else if (of_device_is_compatible(np, "arm,cortex-a7"))
64 			has_a7 = true;
65 	}
66 
67 	np = of_find_compatible_node(NULL, NULL, "renesas,smp-sram");
68 	if (!np) {
69 		/* No smp-sram in DT, fall back to hardcoded address */
70 		res = (struct resource)DEFINE_RES_MEM(ICRAM1,
71 						      shmobile_boot_size);
72 		goto map;
73 	}
74 
75 	error = of_address_to_resource(np, 0, &res);
76 	of_node_put(np);
77 	if (error) {
78 		pr_err("Failed to get smp-sram address: %d\n", error);
79 		return;
80 	}
81 
82 map:
83 	/* RAM for jump stub, because BAR requires 256KB aligned address */
84 	if (res.start & (256 * 1024 - 1) ||
85 	    resource_size(&res) < shmobile_boot_size) {
86 		pr_err("Invalid smp-sram region\n");
87 		return;
88 	}
89 
90 	p = ioremap(res.start, resource_size(&res));
91 	if (!p)
92 		return;
93 	/*
94 	 * install the reset vector, use the largest version if we have enough
95 	 * memory available
96 	 */
97 	if (resource_size(&res) >= shmobile_boot_size_gen2) {
98 		shmobile_boot_cpu_gen2 = read_cpuid_mpidr();
99 		memcpy_toio(p, shmobile_boot_vector_gen2,
100 			    shmobile_boot_size_gen2);
101 	} else {
102 		memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size);
103 	}
104 	iounmap(p);
105 
106 	/* setup reset vectors */
107 	p = ioremap(RST, 0x63);
108 	bar = phys_to_sbar(res.start);
109 	if (has_a15) {
110 		writel_relaxed(bar, p + CA15BAR);
111 		writel_relaxed(bar | SBAR_BAREN, p + CA15BAR);
112 
113 		/* de-assert reset for CA15 CPUs */
114 		writel_relaxed((readl_relaxed(p + CA15RESCNT) &
115 				~CA15RESCNT_CPUS) | CA15RESCNT_CODE,
116 			       p + CA15RESCNT);
117 	}
118 	if (has_a7) {
119 		writel_relaxed(bar, p + CA7BAR);
120 		writel_relaxed(bar | SBAR_BAREN, p + CA7BAR);
121 
122 		/* de-assert reset for CA7 CPUs */
123 		writel_relaxed((readl_relaxed(p + CA7RESCNT) &
124 				~CA7RESCNT_CPUS) | CA7RESCNT_CODE,
125 			       p + CA7RESCNT);
126 	}
127 	iounmap(p);
128 
129 	shmobile_smp_apmu_suspend_init();
130 }
131