3  * Apple SMC Reboot/Poweroff Handler
14 #include <linux/reboot.h>
89 	struct macsmc_reboot *reboot = data->cb_data;  in macsmc_prepare_atomic()  local
91 	dev_info(reboot->dev, "Preparing SMC for atomic mode\n");  in macsmc_prepare_atomic()
93 	apple_smc_enter_atomic(reboot->smc);  in macsmc_prepare_atomic()
99 	struct macsmc_reboot *reboot = data->cb_data;  in macsmc_power_off()  local
101 	dev_info(reboot->dev, "Issuing power off (off1)\n");  in macsmc_power_off()
103 	if (apple_smc_write_u32_atomic(reboot->smc, SMC_KEY(MBSE), SMC_KEY(off1)) < 0) {  in macsmc_power_off()
104 		dev_err(reboot->dev, "Failed to issue MBSE = off1 (power_off)\n");  in macsmc_power_off()
115 	struct macsmc_reboot *reboot = data->cb_data;  in macsmc_restart()  local
117 	dev_info(reboot->dev, "Issuing restart (phra)\n");  in macsmc_restart()
119 	if (apple_smc_write_u32_atomic(reboot->smc, SMC_KEY(MBSE), SMC_KEY(phra)) < 0) {  in macsmc_restart()
120 		dev_err(reboot->dev, "Failed to issue MBSE = phra (restart)\n");  in macsmc_restart()
131 	struct macsmc_reboot *reboot = container_of(this, struct macsmc_reboot, reboot_notify);  in macsmc_reboot_notify()  local
148 	dev_info(reboot->dev, "Preparing for reboot (%p4ch)\n", &val);  in macsmc_reboot_notify()
151 	if (apple_smc_write_u32(reboot->smc, SMC_KEY(MBSE), val) < 0)  in macsmc_reboot_notify()
152 		dev_err(reboot->dev, "Failed to issue MBSE = %p4ch (reboot_prepare)\n", &val);  in macsmc_reboot_notify()
154 	/* Set the boot_stage to 0, which means we're doing a clean shutdown/reboot. */  in macsmc_reboot_notify()
155 	if (reboot->nvm.boot_stage &&  in macsmc_reboot_notify()
156 	    nvmem_cell_set_u8(reboot->nvm.boot_stage, BOOT_STAGE_SHUTDOWN) < 0)  in macsmc_reboot_notify()
157 		dev_err(reboot->dev, "Failed to write boot_stage\n");  in macsmc_reboot_notify()
160 	 * Set the PMU flag to actually reboot into the off state.  in macsmc_reboot_notify()
161 	 * Without this, the device will just reboot. We make it optional in case it is no longer  in macsmc_reboot_notify()
164 	if (reboot->nvm.shutdown_flag &&  in macsmc_reboot_notify()
165 	    nvmem_cell_set_u8(reboot->nvm.shutdown_flag, shutdown_flag) < 0)  in macsmc_reboot_notify()
166 		dev_err(reboot->dev, "Failed to write shutdown_flag\n");  in macsmc_reboot_notify()
171 static void macsmc_power_init_error_counts(struct macsmc_reboot *reboot)  in macsmc_power_init_error_counts()  argument
175 	if (!reboot->nvm.boot_error_count || !reboot->nvm.panic_count)  in macsmc_power_init_error_counts()
178 	boot_error_count = nvmem_cell_get_u8(reboot->nvm.boot_error_count);  in macsmc_power_init_error_counts()
180 		dev_err(reboot->dev, "Failed to read boot_error_count (%d)\n", boot_error_count);  in macsmc_power_init_error_counts()
184 	panic_count = nvmem_cell_get_u8(reboot->nvm.panic_count);  in macsmc_power_init_error_counts()
186 		dev_err(reboot->dev, "Failed to read panic_count (%d)\n", panic_count);  in macsmc_power_init_error_counts()
193 	dev_warn(reboot->dev, "PMU logged %d boot error(s) and %d panic(s)\n",  in macsmc_power_init_error_counts()
196 	if (nvmem_cell_set_u8(reboot->nvm.panic_count, 0) < 0)  in macsmc_power_init_error_counts()
197 		dev_err(reboot->dev, "Failed to reset panic_count\n");  in macsmc_power_init_error_counts()
198 	if (nvmem_cell_set_u8(reboot->nvm.boot_error_count, 0) < 0)  in macsmc_power_init_error_counts()
199 		dev_err(reboot->dev, "Failed to reset boot_error_count\n");  in macsmc_power_init_error_counts()
205 	struct macsmc_reboot *reboot;  in macsmc_reboot_probe()  local
208 	reboot = devm_kzalloc(&pdev->dev, sizeof(*reboot), GFP_KERNEL);  in macsmc_reboot_probe()
209 	if (!reboot)  in macsmc_reboot_probe()
212 	reboot->dev = &pdev->dev;  in macsmc_reboot_probe()
213 	reboot->smc = smc;  in macsmc_reboot_probe()
215 	platform_set_drvdata(pdev, reboot);  in macsmc_reboot_probe()
230 		reboot->nvm_cells[i] = cell;  in macsmc_reboot_probe()
234 	if (reboot->nvm.boot_stage &&  in macsmc_reboot_probe()
235 	    nvmem_cell_set_u8(reboot->nvm.boot_stage, BOOT_STAGE_KERNEL_STARTED) < 0)  in macsmc_reboot_probe()
236 		dev_err(reboot->dev, "Failed to write boot_stage\n");  in macsmc_reboot_probe()
239 	macsmc_power_init_error_counts(reboot);  in macsmc_reboot_probe()
241 	reboot->reboot_notify.notifier_call = macsmc_reboot_notify;  in macsmc_reboot_probe()
244 					    SYS_OFF_PRIO_HIGH, macsmc_prepare_atomic, reboot);  in macsmc_reboot_probe()
249 					    macsmc_power_off, reboot);  in macsmc_reboot_probe()
255 					    SYS_OFF_PRIO_HIGH, macsmc_prepare_atomic, reboot);  in macsmc_reboot_probe()
260 					    macsmc_restart, reboot);  in macsmc_reboot_probe()
264 	ret = devm_register_reboot_notifier(&pdev->dev, &reboot->reboot_notify);  in macsmc_reboot_probe()
266 		return dev_err_probe(&pdev->dev, ret, "Failed to register reboot notifier\n");  in macsmc_reboot_probe()
268 	dev_info(&pdev->dev, "Handling reboot and poweroff requests via SMC\n");  in macsmc_reboot_probe()
274 	{ .compatible = "apple,smc-reboot", },
281 		.name = "macsmc-reboot",
289 MODULE_DESCRIPTION("Apple SMC reboot/poweroff driver");