1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (C) 2012 Samsung Electronics.
4 // Kyungmin Park <kyungmin.park@samsung.com>
5 // Tomasz Figa <t.figa@samsung.com>
6
7 #include <linux/kernel.h>
8 #include <linux/io.h>
9 #include <linux/init.h>
10 #include <linux/of.h>
11 #include <linux/of_address.h>
12
13 #include <asm/cacheflush.h>
14 #include <asm/cputype.h>
15 #include <asm/firmware.h>
16 #include <asm/hardware/cache-l2x0.h>
17 #include <asm/suspend.h>
18
19 #include "common.h"
20 #include "smc.h"
21
22 #define EXYNOS_BOOT_ADDR 0x8
23 #define EXYNOS_BOOT_FLAG 0xc
24
25 static void exynos_save_cp15(void)
26 {
27 /* Save Power control and Diagnostic registers */
28 asm ("mrc p15, 0, %0, c15, c0, 0\n"
29 "mrc p15, 0, %1, c15, c0, 1\n"
30 : "=r" (cp15_save_power), "=r" (cp15_save_diag)
31 : : "cc");
32 }
33
34 static int exynos_do_idle(unsigned long mode)
35 {
36 switch (mode) {
37 case FW_DO_IDLE_AFTR:
38 if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
39 exynos_save_cp15();
40 writel_relaxed(__pa_symbol(exynos_cpu_resume_ns),
41 sysram_ns_base_addr + 0x24);
42 writel_relaxed(EXYNOS_AFTR_MAGIC, sysram_ns_base_addr + 0x20);
43 if (soc_is_exynos3250()) {
44 flush_cache_all();
45 exynos_smc(SMC_CMD_SAVE, OP_TYPE_CORE,
46 SMC_POWERSTATE_IDLE, 0);
47 exynos_smc(SMC_CMD_SHUTDOWN, OP_TYPE_CLUSTER,
48 SMC_POWERSTATE_IDLE, 0);
49 } else
50 exynos_smc(SMC_CMD_CPU0AFTR, 0, 0, 0);
51 break;
52 case FW_DO_IDLE_SLEEP:
53 exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
54 }
55 return 0;
56 }
57
58 static int exynos_cpu_boot(int cpu)
59 {
60 /*
61 * Exynos3250 doesn't need to send smc command for secondary CPU boot
62 * because Exynos3250 removes WFE in secure mode.
63 *
64 * On Exynos5 devices the call is ignored by trustzone firmware.
65 */
66 if (!soc_is_exynos4210() && !soc_is_exynos4212() &&
67 !soc_is_exynos4412())
68 return 0;
69
70 /*
71 * The second parameter of SMC_CMD_CPU1BOOT command means CPU id.
72 * But, Exynos4212 has only one secondary CPU so second parameter
73 * isn't used for informing secure firmware about CPU id.
74 */
75 if (soc_is_exynos4212())
76 cpu = 0;
77
78 exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
79 return 0;
80 }
81
82 static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
83 {
84 void __iomem *boot_reg;
85
86 if (!sysram_ns_base_addr)
87 return -ENODEV;
88
89 boot_reg = sysram_ns_base_addr + 0x1c;
90
91 /*
92 * Almost all Exynos-series of SoCs that run in secure mode don't need
93 * additional offset for every CPU, with Exynos4412 being the only
94 * exception.
95 */
96 if (soc_is_exynos4412())
97 boot_reg += 4 * cpu;
98
99 writel_relaxed(boot_addr, boot_reg);
100 return 0;
101 }
102
103 static int exynos_get_cpu_boot_addr(int cpu, unsigned long *boot_addr)
104 {
105 void __iomem *boot_reg;
106
107 if (!sysram_ns_base_addr)
108 return -ENODEV;
109
110 boot_reg = sysram_ns_base_addr + 0x1c;
111
112 if (soc_is_exynos4412())
113 boot_reg += 4 * cpu;
114
115 *boot_addr = readl_relaxed(boot_reg);
116 return 0;
117 }
118
119 static int exynos_cpu_suspend(unsigned long arg)
120 {
121 flush_cache_all();
122 outer_flush_all();
123
124 exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
125
126 pr_info("Failed to suspend the system\n");
127 writel(0, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
128 return 1;
129 }
130
131 static int exynos_suspend(void)
132 {
133 if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
134 exynos_save_cp15();
135
136 writel(EXYNOS_SLEEP_MAGIC, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
137 writel(__pa_symbol(exynos_cpu_resume_ns),
138 sysram_ns_base_addr + EXYNOS_BOOT_ADDR);
139
140 return cpu_suspend(0, exynos_cpu_suspend);
141 }
142
143 static int exynos_resume(void)
144 {
145 writel(0, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
146
147 return 0;
148 }
149
150 static const struct firmware_ops exynos_firmware_ops = {
151 .do_idle = IS_ENABLED(CONFIG_EXYNOS_CPU_SUSPEND) ? exynos_do_idle : NULL,
152 .set_cpu_boot_addr = exynos_set_cpu_boot_addr,
153 .get_cpu_boot_addr = exynos_get_cpu_boot_addr,
154 .cpu_boot = exynos_cpu_boot,
155 .suspend = IS_ENABLED(CONFIG_PM_SLEEP) ? exynos_suspend : NULL,
156 .resume = IS_ENABLED(CONFIG_EXYNOS_CPU_SUSPEND) ? exynos_resume : NULL,
157 };
158
159 static void exynos_l2_write_sec(unsigned long val, unsigned reg)
160 {
161 static int l2cache_enabled;
162
163 switch (reg) {
164 case L2X0_CTRL:
165 if (val & L2X0_CTRL_EN) {
166 /*
167 * Before the cache can be enabled, due to firmware
168 * design, SMC_CMD_L2X0INVALL must be called.
169 */
170 if (!l2cache_enabled) {
171 exynos_smc(SMC_CMD_L2X0INVALL, 0, 0, 0);
172 l2cache_enabled = 1;
173 }
174 } else {
175 l2cache_enabled = 0;
176 }
177 exynos_smc(SMC_CMD_L2X0CTRL, val, 0, 0);
178 break;
179
180 case L2X0_DEBUG_CTRL:
181 exynos_smc(SMC_CMD_L2X0DEBUG, val, 0, 0);
182 break;
183
184 default:
185 WARN_ONCE(1, "%s: ignoring write to reg 0x%x\n", __func__, reg);
186 }
187 }
188
189 static void exynos_l2_configure(const struct l2x0_regs *regs)
190 {
191 exynos_smc(SMC_CMD_L2X0SETUP1, regs->tag_latency, regs->data_latency,
192 regs->prefetch_ctrl);
193 exynos_smc(SMC_CMD_L2X0SETUP2, regs->pwr_ctrl, regs->aux_ctrl, 0);
194 }
195
196 bool __init exynos_secure_firmware_available(void)
197 {
198 struct device_node *nd;
199 const __be32 *addr;
200
201 nd = of_find_compatible_node(NULL, NULL,
202 "samsung,secure-firmware");
203 if (!nd)
204 return false;
205
206 addr = of_get_address(nd, 0, NULL, NULL);
207 of_node_put(nd);
208 if (!addr) {
209 pr_err("%s: No address specified.\n", __func__);
210 return false;
211 }
212
213 return true;
214 }
215
216 void __init exynos_firmware_init(void)
217 {
218 if (!exynos_secure_firmware_available())
219 return;
220
221 pr_info("Running under secure firmware.\n");
222
223 register_firmware_ops(&exynos_firmware_ops);
224
225 /*
226 * Exynos 4 SoCs (based on Cortex A9 and equipped with L2C-310),
227 * running under secure firmware, require certain registers of L2
228 * cache controller to be written in secure mode. Here .write_sec
229 * callback is provided to perform necessary SMC calls.
230 */
231 if (IS_ENABLED(CONFIG_CACHE_L2X0) &&
232 read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) {
233 outer_cache.write_sec = exynos_l2_write_sec;
234 outer_cache.configure = exynos_l2_configure;
235 }
236 }
237
238 #define REG_CPU_STATE_ADDR (sysram_ns_base_addr + 0x28)
239 #define BOOT_MODE_MASK 0x1f
240
241 void exynos_set_boot_flag(unsigned int cpu, unsigned int mode)
242 {
243 unsigned int tmp;
244
245 tmp = readl_relaxed(REG_CPU_STATE_ADDR + cpu * 4);
246
247 if (mode & BOOT_MODE_MASK)
248 tmp &= ~BOOT_MODE_MASK;
249
250 tmp |= mode;
251 writel_relaxed(tmp, REG_CPU_STATE_ADDR + cpu * 4);
252 }
253
254 void exynos_clear_boot_flag(unsigned int cpu, unsigned int mode)
255 {
256 unsigned int tmp;
257
258 tmp = readl_relaxed(REG_CPU_STATE_ADDR + cpu * 4);
259 tmp &= ~mode;
260 writel_relaxed(tmp, REG_CPU_STATE_ADDR + cpu * 4);
261 }
262
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