2 * R-Car Generation 2 Power management support
4 * Copyright (C) 2013 - 2015 Renesas Electronics Corporation
5 * Copyright (C) 2011 Renesas Solutions Corp.
6 * Copyright (C) 2011 Magnus Damm
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
13 #include <linux/kernel.h>
14 #include <linux/ioport.h>
16 #include <linux/of_address.h>
17 #include <linux/smp.h>
18 #include <linux/soc/renesas/rcar-sysc.h>
21 #include "rcar-gen2.h"
24 #define RST 0xe6160000
26 #define CA15BAR 0x0020 /* CA15 Boot Address Register */
27 #define CA7BAR 0x0030 /* CA7 Boot Address Register */
28 #define CA15RESCNT 0x0040 /* CA15 Reset Control Register */
29 #define CA7RESCNT 0x0044 /* CA7 Reset Control Register */
31 /* SYS Boot Address Register */
32 #define SBAR_BAREN BIT(4) /* SBAR is valid */
34 /* Reset Control Registers */
35 #define CA15RESCNT_CODE 0xa5a50000
36 #define CA15RESCNT_CPUS 0xf /* CPU0-3 */
37 #define CA7RESCNT_CODE 0x5a5a0000
38 #define CA7RESCNT_CPUS 0xf /* CPU0-3 */
42 #define ICRAM1 0xe63c0000 /* Inter Connect RAM1 (4 KiB) */
44 static inline u32 phys_to_sbar(phys_addr_t addr)
46 return (addr >> 8) & 0xfffffc00;
53 #if defined(CONFIG_SMP)
55 static void __init rcar_gen2_sysc_init(u32 syscier)
57 rcar_sysc_init(0xe6180000, syscier);
60 #else /* CONFIG_SMP */
62 static inline void rcar_gen2_sysc_init(u32 syscier) {}
64 #endif /* CONFIG_SMP */
66 void __init rcar_gen2_pm_init(void)
71 struct device_node *np, *cpus;
81 cpus = of_find_node_by_path("/cpus");
85 for_each_child_of_node(cpus, np) {
86 if (of_device_is_compatible(np, "arm,cortex-a15"))
88 else if (of_device_is_compatible(np, "arm,cortex-a7"))
92 if (of_machine_is_compatible("renesas,r8a7790"))
94 else if (of_machine_is_compatible("renesas,r8a7791"))
97 np = of_find_compatible_node(NULL, NULL, "renesas,smp-sram");
99 /* No smp-sram in DT, fall back to hardcoded address */
100 res = (struct resource)DEFINE_RES_MEM(ICRAM1,
105 error = of_address_to_resource(np, 0, &res);
107 pr_err("Failed to get smp-sram address: %d\n", error);
112 /* RAM for jump stub, because BAR requires 256KB aligned address */
113 if (res.start & (256 * 1024 - 1) ||
114 resource_size(&res) < shmobile_boot_size) {
115 pr_err("Invalid smp-sram region\n");
119 p = ioremap(res.start, resource_size(&res));
123 memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size);
126 /* setup reset vectors */
127 p = ioremap_nocache(RST, 0x63);
128 bar = phys_to_sbar(res.start);
130 writel_relaxed(bar, p + CA15BAR);
131 writel_relaxed(bar | SBAR_BAREN, p + CA15BAR);
133 /* de-assert reset for CA15 CPUs */
134 writel_relaxed((readl_relaxed(p + CA15RESCNT) &
135 ~CA15RESCNT_CPUS) | CA15RESCNT_CODE,
139 writel_relaxed(bar, p + CA7BAR);
140 writel_relaxed(bar | SBAR_BAREN, p + CA7BAR);
142 /* de-assert reset for CA7 CPUs */
143 writel_relaxed((readl_relaxed(p + CA7RESCNT) &
144 ~CA7RESCNT_CPUS) | CA7RESCNT_CODE,
149 rcar_gen2_sysc_init(syscier);
150 shmobile_smp_apmu_suspend_init();