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/hardware/cache-l2x0.h>
21 #include <asm/suspend.h>
26 #define EXYNOS_BOOT_ADDR 0x8
27 #define EXYNOS_BOOT_FLAG 0xc
29 static void exynos_save_cp15(void)
31 /* Save Power control and Diagnostic registers */
32 asm ("mrc p15, 0, %0, c15, c0, 0\n"
33 "mrc p15, 0, %1, c15, c0, 1\n"
34 : "=r" (cp15_save_power
), "=r" (cp15_save_diag
)
38 static int exynos_do_idle(unsigned long mode
)
42 if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9
)
44 __raw_writel(virt_to_phys(exynos_cpu_resume_ns
),
45 sysram_ns_base_addr
+ 0x24);
46 __raw_writel(EXYNOS_AFTR_MAGIC
, sysram_ns_base_addr
+ 0x20);
47 if (soc_is_exynos3250()) {
49 exynos_smc(SMC_CMD_SAVE
, OP_TYPE_CORE
,
50 SMC_POWERSTATE_IDLE
, 0);
51 exynos_smc(SMC_CMD_SHUTDOWN
, OP_TYPE_CLUSTER
,
52 SMC_POWERSTATE_IDLE
, 0);
54 exynos_smc(SMC_CMD_CPU0AFTR
, 0, 0, 0);
56 case FW_DO_IDLE_SLEEP
:
57 exynos_smc(SMC_CMD_SLEEP
, 0, 0, 0);
62 static int exynos_cpu_boot(int cpu
)
65 * Exynos3250 doesn't need to send smc command for secondary CPU boot
66 * because Exynos3250 removes WFE in secure mode.
68 if (soc_is_exynos3250())
72 * The second parameter of SMC_CMD_CPU1BOOT command means CPU id.
73 * But, Exynos4212 has only one secondary CPU so second parameter
74 * isn't used for informing secure firmware about CPU id.
76 if (soc_is_exynos4212())
79 exynos_smc(SMC_CMD_CPU1BOOT
, cpu
, 0, 0);
83 static int exynos_set_cpu_boot_addr(int cpu
, unsigned long boot_addr
)
85 void __iomem
*boot_reg
;
87 if (!sysram_ns_base_addr
)
90 boot_reg
= sysram_ns_base_addr
+ 0x1c;
93 * Almost all Exynos-series of SoCs that run in secure mode don't need
94 * additional offset for every CPU, with Exynos4412 being the only
97 if (soc_is_exynos4412())
100 __raw_writel(boot_addr
, boot_reg
);
104 static int exynos_get_cpu_boot_addr(int cpu
, unsigned long *boot_addr
)
106 void __iomem
*boot_reg
;
108 if (!sysram_ns_base_addr
)
111 boot_reg
= sysram_ns_base_addr
+ 0x1c;
113 if (soc_is_exynos4412())
116 *boot_addr
= __raw_readl(boot_reg
);
120 static int exynos_cpu_suspend(unsigned long arg
)
125 exynos_smc(SMC_CMD_SLEEP
, 0, 0, 0);
127 pr_info("Failed to suspend the system\n");
128 writel(0, sysram_ns_base_addr
+ EXYNOS_BOOT_FLAG
);
132 static int exynos_suspend(void)
134 if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9
)
137 writel(EXYNOS_SLEEP_MAGIC
, sysram_ns_base_addr
+ EXYNOS_BOOT_FLAG
);
138 writel(virt_to_phys(exynos_cpu_resume_ns
),
139 sysram_ns_base_addr
+ EXYNOS_BOOT_ADDR
);
141 return cpu_suspend(0, exynos_cpu_suspend
);
144 static int exynos_resume(void)
146 writel(0, sysram_ns_base_addr
+ EXYNOS_BOOT_FLAG
);
151 static const struct firmware_ops exynos_firmware_ops
= {
152 .do_idle
= IS_ENABLED(CONFIG_EXYNOS_CPU_SUSPEND
) ? exynos_do_idle
: NULL
,
153 .set_cpu_boot_addr
= exynos_set_cpu_boot_addr
,
154 .get_cpu_boot_addr
= exynos_get_cpu_boot_addr
,
155 .cpu_boot
= exynos_cpu_boot
,
156 .suspend
= IS_ENABLED(CONFIG_PM_SLEEP
) ? exynos_suspend
: NULL
,
157 .resume
= IS_ENABLED(CONFIG_EXYNOS_CPU_SUSPEND
) ? exynos_resume
: NULL
,
160 static void exynos_l2_write_sec(unsigned long val
, unsigned reg
)
162 static int l2cache_enabled
;
166 if (val
& L2X0_CTRL_EN
) {
168 * Before the cache can be enabled, due to firmware
169 * design, SMC_CMD_L2X0INVALL must be called.
171 if (!l2cache_enabled
) {
172 exynos_smc(SMC_CMD_L2X0INVALL
, 0, 0, 0);
178 exynos_smc(SMC_CMD_L2X0CTRL
, val
, 0, 0);
181 case L2X0_DEBUG_CTRL
:
182 exynos_smc(SMC_CMD_L2X0DEBUG
, val
, 0, 0);
186 WARN_ONCE(1, "%s: ignoring write to reg 0x%x\n", __func__
, reg
);
190 static void exynos_l2_configure(const struct l2x0_regs
*regs
)
192 exynos_smc(SMC_CMD_L2X0SETUP1
, regs
->tag_latency
, regs
->data_latency
,
193 regs
->prefetch_ctrl
);
194 exynos_smc(SMC_CMD_L2X0SETUP2
, regs
->pwr_ctrl
, regs
->aux_ctrl
, 0);
197 void __init
exynos_firmware_init(void)
199 struct device_node
*nd
;
202 nd
= of_find_compatible_node(NULL
, NULL
,
203 "samsung,secure-firmware");
207 addr
= of_get_address(nd
, 0, NULL
, NULL
);
209 pr_err("%s: No address specified.\n", __func__
);
213 pr_info("Running under secure firmware.\n");
215 register_firmware_ops(&exynos_firmware_ops
);
218 * Exynos 4 SoCs (based on Cortex A9 and equipped with L2C-310),
219 * running under secure firmware, require certain registers of L2
220 * cache controller to be written in secure mode. Here .write_sec
221 * callback is provided to perform necessary SMC calls.
223 if (IS_ENABLED(CONFIG_CACHE_L2X0
) &&
224 read_cpuid_part() == ARM_CPU_PART_CORTEX_A9
) {
225 outer_cache
.write_sec
= exynos_l2_write_sec
;
226 outer_cache
.configure
= exynos_l2_configure
;
230 #define REG_CPU_STATE_ADDR (sysram_ns_base_addr + 0x28)
231 #define BOOT_MODE_MASK 0x1f
233 void exynos_set_boot_flag(unsigned int cpu
, unsigned int mode
)
237 tmp
= __raw_readl(REG_CPU_STATE_ADDR
+ cpu
* 4);
239 if (mode
& BOOT_MODE_MASK
)
240 tmp
&= ~BOOT_MODE_MASK
;
243 __raw_writel(tmp
, REG_CPU_STATE_ADDR
+ cpu
* 4);
246 void exynos_clear_boot_flag(unsigned int cpu
, unsigned int mode
)
250 tmp
= __raw_readl(REG_CPU_STATE_ADDR
+ cpu
* 4);
252 __raw_writel(tmp
, REG_CPU_STATE_ADDR
+ cpu
* 4);