2 * Copyright (C) 2012 Samsung Electronics.
3 * Kyungmin Park <kyungmin.park@samsung.com>
4 * Tomasz Figa <t.figa@samsung.com>
6 * This program is free software,you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/kernel.h>
13 #include <linux/init.h>
15 #include <linux/of_address.h>
17 #include <asm/cacheflush.h>
18 #include <asm/cputype.h>
19 #include <asm/firmware.h>
20 #include <asm/suspend.h>
27 #define EXYNOS_SLEEP_MAGIC 0x00000bad
28 #define EXYNOS_AFTR_MAGIC 0xfcba0d10
29 #define EXYNOS_BOOT_ADDR 0x8
30 #define EXYNOS_BOOT_FLAG 0xc
32 static void exynos_save_cp15(void)
34 /* Save Power control and Diagnostic registers */
35 asm ("mrc p15, 0, %0, c15, c0, 0\n"
36 "mrc p15, 0, %1, c15, c0, 1\n"
37 : "=r" (cp15_save_power), "=r" (cp15_save_diag)
41 static int exynos_do_idle(unsigned long mode)
45 if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
47 __raw_writel(virt_to_phys(exynos_cpu_resume_ns),
48 sysram_ns_base_addr + 0x24);
49 __raw_writel(EXYNOS_AFTR_MAGIC, sysram_ns_base_addr + 0x20);
50 exynos_smc(SMC_CMD_CPU0AFTR, 0, 0, 0);
52 case FW_DO_IDLE_SLEEP:
53 exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
58 static int exynos_cpu_boot(int cpu)
61 * Exynos3250 doesn't need to send smc command for secondary CPU boot
62 * because Exynos3250 removes WFE in secure mode.
64 if (soc_is_exynos3250())
68 * The second parameter of SMC_CMD_CPU1BOOT command means CPU id.
69 * But, Exynos4212 has only one secondary CPU so second parameter
70 * isn't used for informing secure firmware about CPU id.
72 if (soc_is_exynos4212())
75 exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
79 static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
81 void __iomem *boot_reg;
83 if (!sysram_ns_base_addr)
86 boot_reg = sysram_ns_base_addr + 0x1c;
89 * Almost all Exynos-series of SoCs that run in secure mode don't need
90 * additional offset for every CPU, with Exynos4412 being the only
93 if (soc_is_exynos4412())
96 __raw_writel(boot_addr, boot_reg);
100 static int exynos_cpu_suspend(unsigned long arg)
105 exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
107 pr_info("Failed to suspend the system\n");
108 writel(0, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
112 static int exynos_suspend(void)
114 if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
117 writel(EXYNOS_SLEEP_MAGIC, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
118 writel(virt_to_phys(exynos_cpu_resume_ns),
119 sysram_ns_base_addr + EXYNOS_BOOT_ADDR);
121 return cpu_suspend(0, exynos_cpu_suspend);
124 static int exynos_resume(void)
126 writel(0, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
131 static const struct firmware_ops exynos_firmware_ops = {
132 .do_idle = IS_ENABLED(CONFIG_EXYNOS_CPU_SUSPEND) ? exynos_do_idle : NULL,
133 .set_cpu_boot_addr = exynos_set_cpu_boot_addr,
134 .cpu_boot = exynos_cpu_boot,
135 .suspend = IS_ENABLED(CONFIG_PM_SLEEP) ? exynos_suspend : NULL,
136 .resume = IS_ENABLED(CONFIG_EXYNOS_CPU_SUSPEND) ? exynos_resume : NULL,
139 void __init exynos_firmware_init(void)
141 struct device_node *nd;
144 nd = of_find_compatible_node(NULL, NULL,
145 "samsung,secure-firmware");
149 addr = of_get_address(nd, 0, NULL, NULL);
151 pr_err("%s: No address specified.\n", __func__);
155 pr_info("Running under secure firmware.\n");
157 register_firmware_ops(&exynos_firmware_ops);