1afe761f8SDave Gerlach // SPDX-License-Identifier: GPL-2.0 2afe761f8SDave Gerlach /* 3afe761f8SDave Gerlach * AM33XX Power Management Routines 4afe761f8SDave Gerlach * 5afe761f8SDave Gerlach * Copyright (C) 2012-2018 Texas Instruments Incorporated - http://www.ti.com/ 6afe761f8SDave Gerlach * Vaibhav Bedia, Dave Gerlach 7afe761f8SDave Gerlach */ 8afe761f8SDave Gerlach 95a99ae00SKeerthy #include <linux/clk.h> 10afe761f8SDave Gerlach #include <linux/cpu.h> 11afe761f8SDave Gerlach #include <linux/err.h> 12afe761f8SDave Gerlach #include <linux/genalloc.h> 13afe761f8SDave Gerlach #include <linux/kernel.h> 14afe761f8SDave Gerlach #include <linux/init.h> 15afe761f8SDave Gerlach #include <linux/io.h> 16afe761f8SDave Gerlach #include <linux/module.h> 175a99ae00SKeerthy #include <linux/nvmem-consumer.h> 18afe761f8SDave Gerlach #include <linux/of.h> 19afe761f8SDave Gerlach #include <linux/platform_data/pm33xx.h> 20afe761f8SDave Gerlach #include <linux/platform_device.h> 215a99ae00SKeerthy #include <linux/rtc.h> 225a99ae00SKeerthy #include <linux/rtc/rtc-omap.h> 23afe761f8SDave Gerlach #include <linux/sizes.h> 24afe761f8SDave Gerlach #include <linux/sram.h> 25afe761f8SDave Gerlach #include <linux/suspend.h> 26afe761f8SDave Gerlach #include <linux/ti-emif-sram.h> 27afe761f8SDave Gerlach #include <linux/wkup_m3_ipc.h> 28afe761f8SDave Gerlach 29afe761f8SDave Gerlach #include <asm/proc-fns.h> 30afe761f8SDave Gerlach #include <asm/suspend.h> 31afe761f8SDave Gerlach #include <asm/system_misc.h> 32afe761f8SDave Gerlach 33afe761f8SDave Gerlach #define AMX3_PM_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \ 34afe761f8SDave Gerlach (unsigned long)pm_sram->do_wfi) 35afe761f8SDave Gerlach 365a99ae00SKeerthy #define RTC_SCRATCH_RESUME_REG 0 375a99ae00SKeerthy #define RTC_SCRATCH_MAGIC_REG 1 385a99ae00SKeerthy #define RTC_REG_BOOT_MAGIC 0x8cd0 /* RTC */ 395a99ae00SKeerthy #define GIC_INT_SET_PENDING_BASE 0x200 405a99ae00SKeerthy #define AM43XX_GIC_DIST_BASE 0x48241000 415a99ae00SKeerthy 425a99ae00SKeerthy static u32 rtc_magic_val; 435a99ae00SKeerthy 44afe761f8SDave Gerlach static int (*am33xx_do_wfi_sram)(unsigned long unused); 45afe761f8SDave Gerlach static phys_addr_t am33xx_do_wfi_sram_phys; 46afe761f8SDave Gerlach 47afe761f8SDave Gerlach static struct gen_pool *sram_pool, *sram_pool_data; 48afe761f8SDave Gerlach static unsigned long ocmcram_location, ocmcram_location_data; 49afe761f8SDave Gerlach 505a99ae00SKeerthy static struct rtc_device *omap_rtc; 515a99ae00SKeerthy static void __iomem *gic_dist_base; 525a99ae00SKeerthy 53afe761f8SDave Gerlach static struct am33xx_pm_platform_data *pm_ops; 54afe761f8SDave Gerlach static struct am33xx_pm_sram_addr *pm_sram; 55afe761f8SDave Gerlach 56afe761f8SDave Gerlach static struct device *pm33xx_dev; 57afe761f8SDave Gerlach static struct wkup_m3_ipc *m3_ipc; 58afe761f8SDave Gerlach 595a99ae00SKeerthy #ifdef CONFIG_SUSPEND 605a99ae00SKeerthy static int rtc_only_idle; 615a99ae00SKeerthy static int retrigger_irq; 6274655749SDave Gerlach static unsigned long suspend_wfi_flags; 6374655749SDave Gerlach 645a99ae00SKeerthy static struct wkup_m3_wakeup_src wakeup_src = {.irq_nr = 0, 655a99ae00SKeerthy .src = "Unknown", 665a99ae00SKeerthy }; 675a99ae00SKeerthy 685a99ae00SKeerthy static struct wkup_m3_wakeup_src rtc_alarm_wakeup = { 695a99ae00SKeerthy .irq_nr = 108, .src = "RTC Alarm", 705a99ae00SKeerthy }; 715a99ae00SKeerthy 725a99ae00SKeerthy static struct wkup_m3_wakeup_src rtc_ext_wakeup = { 735a99ae00SKeerthy .irq_nr = 0, .src = "Ext wakeup", 745a99ae00SKeerthy }; 755a99ae00SKeerthy #endif 765a99ae00SKeerthy 77afe761f8SDave Gerlach static u32 sram_suspend_address(unsigned long addr) 78afe761f8SDave Gerlach { 79afe761f8SDave Gerlach return ((unsigned long)am33xx_do_wfi_sram + 80afe761f8SDave Gerlach AMX3_PM_SRAM_SYMBOL_OFFSET(addr)); 81afe761f8SDave Gerlach } 82afe761f8SDave Gerlach 831c6c0354SKeerthy static int am33xx_push_sram_idle(void) 841c6c0354SKeerthy { 851c6c0354SKeerthy struct am33xx_pm_ro_sram_data ro_sram_data; 861c6c0354SKeerthy int ret; 871c6c0354SKeerthy u32 table_addr, ro_data_addr; 881c6c0354SKeerthy void *copy_addr; 891c6c0354SKeerthy 901c6c0354SKeerthy ro_sram_data.amx3_pm_sram_data_virt = ocmcram_location_data; 911c6c0354SKeerthy ro_sram_data.amx3_pm_sram_data_phys = 921c6c0354SKeerthy gen_pool_virt_to_phys(sram_pool_data, ocmcram_location_data); 931c6c0354SKeerthy ro_sram_data.rtc_base_virt = pm_ops->get_rtc_base_addr(); 941c6c0354SKeerthy 951c6c0354SKeerthy /* Save physical address to calculate resume offset during pm init */ 961c6c0354SKeerthy am33xx_do_wfi_sram_phys = gen_pool_virt_to_phys(sram_pool, 971c6c0354SKeerthy ocmcram_location); 981c6c0354SKeerthy 991c6c0354SKeerthy am33xx_do_wfi_sram = sram_exec_copy(sram_pool, (void *)ocmcram_location, 1001c6c0354SKeerthy pm_sram->do_wfi, 1011c6c0354SKeerthy *pm_sram->do_wfi_sz); 1021c6c0354SKeerthy if (!am33xx_do_wfi_sram) { 1031c6c0354SKeerthy dev_err(pm33xx_dev, 1041c6c0354SKeerthy "PM: %s: am33xx_do_wfi copy to sram failed\n", 1051c6c0354SKeerthy __func__); 1061c6c0354SKeerthy return -ENODEV; 1071c6c0354SKeerthy } 1081c6c0354SKeerthy 1091c6c0354SKeerthy table_addr = 1101c6c0354SKeerthy sram_suspend_address((unsigned long)pm_sram->emif_sram_table); 1111c6c0354SKeerthy ret = ti_emif_copy_pm_function_table(sram_pool, (void *)table_addr); 1121c6c0354SKeerthy if (ret) { 1131c6c0354SKeerthy dev_dbg(pm33xx_dev, 1141c6c0354SKeerthy "PM: %s: EMIF function copy failed\n", __func__); 1151c6c0354SKeerthy return -EPROBE_DEFER; 1161c6c0354SKeerthy } 1171c6c0354SKeerthy 1181c6c0354SKeerthy ro_data_addr = 1191c6c0354SKeerthy sram_suspend_address((unsigned long)pm_sram->ro_sram_data); 1201c6c0354SKeerthy copy_addr = sram_exec_copy(sram_pool, (void *)ro_data_addr, 1211c6c0354SKeerthy &ro_sram_data, 1221c6c0354SKeerthy sizeof(ro_sram_data)); 1231c6c0354SKeerthy if (!copy_addr) { 1241c6c0354SKeerthy dev_err(pm33xx_dev, 1251c6c0354SKeerthy "PM: %s: ro_sram_data copy to sram failed\n", 1261c6c0354SKeerthy __func__); 1271c6c0354SKeerthy return -ENODEV; 1281c6c0354SKeerthy } 1291c6c0354SKeerthy 1301c6c0354SKeerthy return 0; 1311c6c0354SKeerthy } 1321c6c0354SKeerthy 1336afaff1cSDave Gerlach static int am33xx_do_sram_idle(u32 wfi_flags) 1346afaff1cSDave Gerlach { 1356afaff1cSDave Gerlach int ret = 0; 1366afaff1cSDave Gerlach 1376afaff1cSDave Gerlach if (!m3_ipc || !pm_ops) 1386afaff1cSDave Gerlach return 0; 1396afaff1cSDave Gerlach 1406afaff1cSDave Gerlach if (wfi_flags & WFI_FLAG_WAKE_M3) 1416afaff1cSDave Gerlach ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_IDLE); 1426afaff1cSDave Gerlach 1436afaff1cSDave Gerlach return pm_ops->cpu_suspend(am33xx_do_wfi_sram, wfi_flags); 1446afaff1cSDave Gerlach } 1456afaff1cSDave Gerlach 1465a99ae00SKeerthy static int __init am43xx_map_gic(void) 1475a99ae00SKeerthy { 1485a99ae00SKeerthy gic_dist_base = ioremap(AM43XX_GIC_DIST_BASE, SZ_4K); 1495a99ae00SKeerthy 1505a99ae00SKeerthy if (!gic_dist_base) 1515a99ae00SKeerthy return -ENOMEM; 1525a99ae00SKeerthy 1535a99ae00SKeerthy return 0; 1545a99ae00SKeerthy } 1555a99ae00SKeerthy 156afe761f8SDave Gerlach #ifdef CONFIG_SUSPEND 1574a65bbb9SYueHaibing static struct wkup_m3_wakeup_src rtc_wake_src(void) 1585a99ae00SKeerthy { 1595a99ae00SKeerthy u32 i; 1605a99ae00SKeerthy 1615a99ae00SKeerthy i = __raw_readl(pm_ops->get_rtc_base_addr() + 0x44) & 0x40; 1625a99ae00SKeerthy 1635a99ae00SKeerthy if (i) { 1645a99ae00SKeerthy retrigger_irq = rtc_alarm_wakeup.irq_nr; 1655a99ae00SKeerthy return rtc_alarm_wakeup; 1665a99ae00SKeerthy } 1675a99ae00SKeerthy 1685a99ae00SKeerthy retrigger_irq = rtc_ext_wakeup.irq_nr; 1695a99ae00SKeerthy 1705a99ae00SKeerthy return rtc_ext_wakeup; 1715a99ae00SKeerthy } 1725a99ae00SKeerthy 1734a65bbb9SYueHaibing static int am33xx_rtc_only_idle(unsigned long wfi_flags) 1745a99ae00SKeerthy { 1755a99ae00SKeerthy omap_rtc_power_off_program(&omap_rtc->dev); 1765a99ae00SKeerthy am33xx_do_wfi_sram(wfi_flags); 1775a99ae00SKeerthy return 0; 1785a99ae00SKeerthy } 1795a99ae00SKeerthy 180afe761f8SDave Gerlach static int am33xx_pm_suspend(suspend_state_t suspend_state) 181afe761f8SDave Gerlach { 182afe761f8SDave Gerlach int i, ret = 0; 183afe761f8SDave Gerlach 1845a99ae00SKeerthy if (suspend_state == PM_SUSPEND_MEM && 1855a99ae00SKeerthy pm_ops->check_off_mode_enable()) { 1865a99ae00SKeerthy pm_ops->prepare_rtc_suspend(); 1875a99ae00SKeerthy pm_ops->save_context(); 1885a99ae00SKeerthy suspend_wfi_flags |= WFI_FLAG_RTC_ONLY; 1895a99ae00SKeerthy clk_save_context(); 1905a99ae00SKeerthy ret = pm_ops->soc_suspend(suspend_state, am33xx_rtc_only_idle, 1915a99ae00SKeerthy suspend_wfi_flags); 1925a99ae00SKeerthy 1935a99ae00SKeerthy suspend_wfi_flags &= ~WFI_FLAG_RTC_ONLY; 19445450f36SKeerthy dev_info(pm33xx_dev, "Entering RTC Only mode with DDR in self-refresh\n"); 1955a99ae00SKeerthy 1965a99ae00SKeerthy if (!ret) { 1975a99ae00SKeerthy clk_restore_context(); 1985a99ae00SKeerthy pm_ops->restore_context(); 1995a99ae00SKeerthy m3_ipc->ops->set_rtc_only(m3_ipc); 2005a99ae00SKeerthy am33xx_push_sram_idle(); 2015a99ae00SKeerthy } 2025a99ae00SKeerthy } else { 2035a99ae00SKeerthy ret = pm_ops->soc_suspend(suspend_state, am33xx_do_wfi_sram, 2045a99ae00SKeerthy suspend_wfi_flags); 2055a99ae00SKeerthy } 206afe761f8SDave Gerlach 207afe761f8SDave Gerlach if (ret) { 208afe761f8SDave Gerlach dev_err(pm33xx_dev, "PM: Kernel suspend failure\n"); 209afe761f8SDave Gerlach } else { 210afe761f8SDave Gerlach i = m3_ipc->ops->request_pm_status(m3_ipc); 211afe761f8SDave Gerlach 212afe761f8SDave Gerlach switch (i) { 213afe761f8SDave Gerlach case 0: 214afe761f8SDave Gerlach dev_info(pm33xx_dev, 215afe761f8SDave Gerlach "PM: Successfully put all powerdomains to target state\n"); 216afe761f8SDave Gerlach break; 217afe761f8SDave Gerlach case 1: 218afe761f8SDave Gerlach dev_err(pm33xx_dev, 219afe761f8SDave Gerlach "PM: Could not transition all powerdomains to target state\n"); 220afe761f8SDave Gerlach ret = -1; 221afe761f8SDave Gerlach break; 222afe761f8SDave Gerlach default: 223afe761f8SDave Gerlach dev_err(pm33xx_dev, 224afe761f8SDave Gerlach "PM: CM3 returned unknown result = %d\n", i); 225afe761f8SDave Gerlach ret = -1; 226afe761f8SDave Gerlach } 2275a99ae00SKeerthy 2285a99ae00SKeerthy /* print the wakeup reason */ 2295a99ae00SKeerthy if (rtc_only_idle) { 2305a99ae00SKeerthy wakeup_src = rtc_wake_src(); 2315a99ae00SKeerthy pr_info("PM: Wakeup source %s\n", wakeup_src.src); 2325a99ae00SKeerthy } else { 2335a99ae00SKeerthy pr_info("PM: Wakeup source %s\n", 2345a99ae00SKeerthy m3_ipc->ops->request_wake_src(m3_ipc)); 235afe761f8SDave Gerlach } 2365a99ae00SKeerthy } 2375a99ae00SKeerthy 2385a99ae00SKeerthy if (suspend_state == PM_SUSPEND_MEM && pm_ops->check_off_mode_enable()) 2395a99ae00SKeerthy pm_ops->prepare_rtc_resume(); 240afe761f8SDave Gerlach 241afe761f8SDave Gerlach return ret; 242afe761f8SDave Gerlach } 243afe761f8SDave Gerlach 244afe761f8SDave Gerlach static int am33xx_pm_enter(suspend_state_t suspend_state) 245afe761f8SDave Gerlach { 246afe761f8SDave Gerlach int ret = 0; 247afe761f8SDave Gerlach 248afe761f8SDave Gerlach switch (suspend_state) { 249afe761f8SDave Gerlach case PM_SUSPEND_MEM: 250afe761f8SDave Gerlach case PM_SUSPEND_STANDBY: 251afe761f8SDave Gerlach ret = am33xx_pm_suspend(suspend_state); 252afe761f8SDave Gerlach break; 253afe761f8SDave Gerlach default: 254afe761f8SDave Gerlach ret = -EINVAL; 255afe761f8SDave Gerlach } 256afe761f8SDave Gerlach 257afe761f8SDave Gerlach return ret; 258afe761f8SDave Gerlach } 259afe761f8SDave Gerlach 260afe761f8SDave Gerlach static int am33xx_pm_begin(suspend_state_t state) 261afe761f8SDave Gerlach { 262afe761f8SDave Gerlach int ret = -EINVAL; 2635a99ae00SKeerthy struct nvmem_device *nvmem; 2645a99ae00SKeerthy 2655a99ae00SKeerthy if (state == PM_SUSPEND_MEM && pm_ops->check_off_mode_enable()) { 2665a99ae00SKeerthy nvmem = devm_nvmem_device_get(&omap_rtc->dev, 2675a99ae00SKeerthy "omap_rtc_scratch0"); 268d8e0cecbSKeerthy if (!IS_ERR(nvmem)) 2695a99ae00SKeerthy nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4, 4, 2705a99ae00SKeerthy (void *)&rtc_magic_val); 2715a99ae00SKeerthy rtc_only_idle = 1; 2725a99ae00SKeerthy } else { 2735a99ae00SKeerthy rtc_only_idle = 0; 2745a99ae00SKeerthy } 275afe761f8SDave Gerlach 2766afaff1cSDave Gerlach pm_ops->begin_suspend(); 2776afaff1cSDave Gerlach 278afe761f8SDave Gerlach switch (state) { 279afe761f8SDave Gerlach case PM_SUSPEND_MEM: 280afe761f8SDave Gerlach ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_DEEPSLEEP); 281afe761f8SDave Gerlach break; 282afe761f8SDave Gerlach case PM_SUSPEND_STANDBY: 283afe761f8SDave Gerlach ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_STANDBY); 284afe761f8SDave Gerlach break; 285afe761f8SDave Gerlach } 286afe761f8SDave Gerlach 287afe761f8SDave Gerlach return ret; 288afe761f8SDave Gerlach } 289afe761f8SDave Gerlach 290afe761f8SDave Gerlach static void am33xx_pm_end(void) 291afe761f8SDave Gerlach { 2925a99ae00SKeerthy u32 val = 0; 2935a99ae00SKeerthy struct nvmem_device *nvmem; 2945a99ae00SKeerthy 2955a99ae00SKeerthy nvmem = devm_nvmem_device_get(&omap_rtc->dev, "omap_rtc_scratch0"); 296d8e0cecbSKeerthy if (IS_ERR(nvmem)) 297d8e0cecbSKeerthy return; 298d8e0cecbSKeerthy 299afe761f8SDave Gerlach m3_ipc->ops->finish_low_power(m3_ipc); 3005a99ae00SKeerthy if (rtc_only_idle) { 301d8e0cecbSKeerthy if (retrigger_irq) { 3025a99ae00SKeerthy /* 3035a99ae00SKeerthy * 32 bits of Interrupt Set-Pending correspond to 32 3045a99ae00SKeerthy * 32 interrupts. Compute the bit offset of the 3055a99ae00SKeerthy * Interrupt and set that particular bit 3065a99ae00SKeerthy * Compute the register offset by dividing interrupt 3075a99ae00SKeerthy * number by 32 and mutiplying by 4 3085a99ae00SKeerthy */ 3095a99ae00SKeerthy writel_relaxed(1 << (retrigger_irq & 31), 3105a99ae00SKeerthy gic_dist_base + GIC_INT_SET_PENDING_BASE 3115a99ae00SKeerthy + retrigger_irq / 32 * 4); 312d8e0cecbSKeerthy } 313d8e0cecbSKeerthy 3145a99ae00SKeerthy nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4, 4, 3155a99ae00SKeerthy (void *)&val); 3165a99ae00SKeerthy } 3175a99ae00SKeerthy 3185a99ae00SKeerthy rtc_only_idle = 0; 3196afaff1cSDave Gerlach 3206afaff1cSDave Gerlach pm_ops->finish_suspend(); 321afe761f8SDave Gerlach } 322afe761f8SDave Gerlach 323afe761f8SDave Gerlach static int am33xx_pm_valid(suspend_state_t state) 324afe761f8SDave Gerlach { 325afe761f8SDave Gerlach switch (state) { 326afe761f8SDave Gerlach case PM_SUSPEND_STANDBY: 327afe761f8SDave Gerlach case PM_SUSPEND_MEM: 328afe761f8SDave Gerlach return 1; 329afe761f8SDave Gerlach default: 330afe761f8SDave Gerlach return 0; 331afe761f8SDave Gerlach } 332afe761f8SDave Gerlach } 333afe761f8SDave Gerlach 334afe761f8SDave Gerlach static const struct platform_suspend_ops am33xx_pm_ops = { 335afe761f8SDave Gerlach .begin = am33xx_pm_begin, 336afe761f8SDave Gerlach .end = am33xx_pm_end, 337afe761f8SDave Gerlach .enter = am33xx_pm_enter, 338afe761f8SDave Gerlach .valid = am33xx_pm_valid, 339afe761f8SDave Gerlach }; 340afe761f8SDave Gerlach #endif /* CONFIG_SUSPEND */ 341afe761f8SDave Gerlach 342afe761f8SDave Gerlach static void am33xx_pm_set_ipc_ops(void) 343afe761f8SDave Gerlach { 344afe761f8SDave Gerlach u32 resume_address; 345afe761f8SDave Gerlach int temp; 346afe761f8SDave Gerlach 347afe761f8SDave Gerlach temp = ti_emif_get_mem_type(); 348afe761f8SDave Gerlach if (temp < 0) { 349afe761f8SDave Gerlach dev_err(pm33xx_dev, "PM: Cannot determine memory type, no PM available\n"); 350afe761f8SDave Gerlach return; 351afe761f8SDave Gerlach } 352afe761f8SDave Gerlach m3_ipc->ops->set_mem_type(m3_ipc, temp); 353afe761f8SDave Gerlach 354afe761f8SDave Gerlach /* Physical resume address to be used by ROM code */ 355afe761f8SDave Gerlach resume_address = am33xx_do_wfi_sram_phys + 356afe761f8SDave Gerlach *pm_sram->resume_offset + 0x4; 357afe761f8SDave Gerlach 358afe761f8SDave Gerlach m3_ipc->ops->set_resume_address(m3_ipc, (void *)resume_address); 359afe761f8SDave Gerlach } 360afe761f8SDave Gerlach 361afe761f8SDave Gerlach static void am33xx_pm_free_sram(void) 362afe761f8SDave Gerlach { 363afe761f8SDave Gerlach gen_pool_free(sram_pool, ocmcram_location, *pm_sram->do_wfi_sz); 364afe761f8SDave Gerlach gen_pool_free(sram_pool_data, ocmcram_location_data, 365afe761f8SDave Gerlach sizeof(struct am33xx_pm_ro_sram_data)); 366afe761f8SDave Gerlach } 367afe761f8SDave Gerlach 368afe761f8SDave Gerlach /* 369afe761f8SDave Gerlach * Push the minimal suspend-resume code to SRAM 370afe761f8SDave Gerlach */ 371afe761f8SDave Gerlach static int am33xx_pm_alloc_sram(void) 372afe761f8SDave Gerlach { 373afe761f8SDave Gerlach struct device_node *np; 374afe761f8SDave Gerlach int ret = 0; 375afe761f8SDave Gerlach 376afe761f8SDave Gerlach np = of_find_compatible_node(NULL, NULL, "ti,omap3-mpu"); 377afe761f8SDave Gerlach if (!np) { 378afe761f8SDave Gerlach np = of_find_compatible_node(NULL, NULL, "ti,omap4-mpu"); 379afe761f8SDave Gerlach if (!np) { 380afe761f8SDave Gerlach dev_err(pm33xx_dev, "PM: %s: Unable to find device node for mpu\n", 381afe761f8SDave Gerlach __func__); 382afe761f8SDave Gerlach return -ENODEV; 383afe761f8SDave Gerlach } 384afe761f8SDave Gerlach } 385afe761f8SDave Gerlach 386afe761f8SDave Gerlach sram_pool = of_gen_pool_get(np, "pm-sram", 0); 387afe761f8SDave Gerlach if (!sram_pool) { 388afe761f8SDave Gerlach dev_err(pm33xx_dev, "PM: %s: Unable to get sram pool for ocmcram\n", 389afe761f8SDave Gerlach __func__); 390afe761f8SDave Gerlach ret = -ENODEV; 391afe761f8SDave Gerlach goto mpu_put_node; 392afe761f8SDave Gerlach } 393afe761f8SDave Gerlach 394afe761f8SDave Gerlach sram_pool_data = of_gen_pool_get(np, "pm-sram", 1); 395afe761f8SDave Gerlach if (!sram_pool_data) { 396afe761f8SDave Gerlach dev_err(pm33xx_dev, "PM: %s: Unable to get sram data pool for ocmcram\n", 397afe761f8SDave Gerlach __func__); 398afe761f8SDave Gerlach ret = -ENODEV; 399afe761f8SDave Gerlach goto mpu_put_node; 400afe761f8SDave Gerlach } 401afe761f8SDave Gerlach 402afe761f8SDave Gerlach ocmcram_location = gen_pool_alloc(sram_pool, *pm_sram->do_wfi_sz); 403afe761f8SDave Gerlach if (!ocmcram_location) { 404afe761f8SDave Gerlach dev_err(pm33xx_dev, "PM: %s: Unable to allocate memory from ocmcram\n", 405afe761f8SDave Gerlach __func__); 406afe761f8SDave Gerlach ret = -ENOMEM; 407afe761f8SDave Gerlach goto mpu_put_node; 408afe761f8SDave Gerlach } 409afe761f8SDave Gerlach 410afe761f8SDave Gerlach ocmcram_location_data = gen_pool_alloc(sram_pool_data, 411afe761f8SDave Gerlach sizeof(struct emif_regs_amx3)); 412afe761f8SDave Gerlach if (!ocmcram_location_data) { 413afe761f8SDave Gerlach dev_err(pm33xx_dev, "PM: Unable to allocate memory from ocmcram\n"); 414afe761f8SDave Gerlach gen_pool_free(sram_pool, ocmcram_location, *pm_sram->do_wfi_sz); 415afe761f8SDave Gerlach ret = -ENOMEM; 416afe761f8SDave Gerlach } 417afe761f8SDave Gerlach 418afe761f8SDave Gerlach mpu_put_node: 419afe761f8SDave Gerlach of_node_put(np); 420afe761f8SDave Gerlach return ret; 421afe761f8SDave Gerlach } 422afe761f8SDave Gerlach 4235a99ae00SKeerthy static int am33xx_pm_rtc_setup(void) 4245a99ae00SKeerthy { 4255a99ae00SKeerthy struct device_node *np; 4265a99ae00SKeerthy unsigned long val = 0; 4275a99ae00SKeerthy struct nvmem_device *nvmem; 4285a99ae00SKeerthy 4295a99ae00SKeerthy np = of_find_node_by_name(NULL, "rtc"); 4305a99ae00SKeerthy 4315a99ae00SKeerthy if (of_device_is_available(np)) { 4325a99ae00SKeerthy omap_rtc = rtc_class_open("rtc0"); 4335a99ae00SKeerthy if (!omap_rtc) { 4345a99ae00SKeerthy pr_warn("PM: rtc0 not available"); 4355a99ae00SKeerthy return -EPROBE_DEFER; 4365a99ae00SKeerthy } 4375a99ae00SKeerthy 4385a99ae00SKeerthy nvmem = devm_nvmem_device_get(&omap_rtc->dev, 4395a99ae00SKeerthy "omap_rtc_scratch0"); 440d8e0cecbSKeerthy if (!IS_ERR(nvmem)) { 4415a99ae00SKeerthy nvmem_device_read(nvmem, RTC_SCRATCH_MAGIC_REG * 4, 4425a99ae00SKeerthy 4, (void *)&rtc_magic_val); 4435a99ae00SKeerthy if ((rtc_magic_val & 0xffff) != RTC_REG_BOOT_MAGIC) 4445a99ae00SKeerthy pr_warn("PM: bootloader does not support rtc-only!\n"); 4455a99ae00SKeerthy 4465a99ae00SKeerthy nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4, 4475a99ae00SKeerthy 4, (void *)&val); 4485a99ae00SKeerthy val = pm_sram->resume_address; 4495a99ae00SKeerthy nvmem_device_write(nvmem, RTC_SCRATCH_RESUME_REG * 4, 4505a99ae00SKeerthy 4, (void *)&val); 4515a99ae00SKeerthy } 4525a99ae00SKeerthy } else { 4535a99ae00SKeerthy pr_warn("PM: no-rtc available, rtc-only mode disabled.\n"); 4545a99ae00SKeerthy } 4555a99ae00SKeerthy 4565a99ae00SKeerthy return 0; 4575a99ae00SKeerthy } 4585a99ae00SKeerthy 459afe761f8SDave Gerlach static int am33xx_pm_probe(struct platform_device *pdev) 460afe761f8SDave Gerlach { 461afe761f8SDave Gerlach struct device *dev = &pdev->dev; 462afe761f8SDave Gerlach int ret; 463afe761f8SDave Gerlach 464afe761f8SDave Gerlach if (!of_machine_is_compatible("ti,am33xx") && 465afe761f8SDave Gerlach !of_machine_is_compatible("ti,am43")) 466afe761f8SDave Gerlach return -ENODEV; 467afe761f8SDave Gerlach 468afe761f8SDave Gerlach pm_ops = dev->platform_data; 469afe761f8SDave Gerlach if (!pm_ops) { 470afe761f8SDave Gerlach dev_err(dev, "PM: Cannot get core PM ops!\n"); 471afe761f8SDave Gerlach return -ENODEV; 472afe761f8SDave Gerlach } 473afe761f8SDave Gerlach 4745a99ae00SKeerthy ret = am43xx_map_gic(); 4755a99ae00SKeerthy if (ret) { 4765a99ae00SKeerthy pr_err("PM: Could not ioremap GIC base\n"); 4775a99ae00SKeerthy return ret; 4785a99ae00SKeerthy } 4795a99ae00SKeerthy 480afe761f8SDave Gerlach pm_sram = pm_ops->get_sram_addrs(); 481afe761f8SDave Gerlach if (!pm_sram) { 482afe761f8SDave Gerlach dev_err(dev, "PM: Cannot get PM asm function addresses!!\n"); 483afe761f8SDave Gerlach return -ENODEV; 484afe761f8SDave Gerlach } 485afe761f8SDave Gerlach 4865a99ae00SKeerthy m3_ipc = wkup_m3_ipc_get(); 4875a99ae00SKeerthy if (!m3_ipc) { 4885a99ae00SKeerthy pr_err("PM: Cannot get wkup_m3_ipc handle\n"); 4895a99ae00SKeerthy return -EPROBE_DEFER; 4905a99ae00SKeerthy } 4915a99ae00SKeerthy 492afe761f8SDave Gerlach pm33xx_dev = dev; 493afe761f8SDave Gerlach 494afe761f8SDave Gerlach ret = am33xx_pm_alloc_sram(); 495afe761f8SDave Gerlach if (ret) 496afe761f8SDave Gerlach return ret; 497afe761f8SDave Gerlach 4985a99ae00SKeerthy ret = am33xx_pm_rtc_setup(); 499afe761f8SDave Gerlach if (ret) 500afe761f8SDave Gerlach goto err_free_sram; 501afe761f8SDave Gerlach 5025a99ae00SKeerthy ret = am33xx_push_sram_idle(); 5035a99ae00SKeerthy if (ret) 504afe761f8SDave Gerlach goto err_free_sram; 505afe761f8SDave Gerlach 506afe761f8SDave Gerlach am33xx_pm_set_ipc_ops(); 507afe761f8SDave Gerlach 508afe761f8SDave Gerlach #ifdef CONFIG_SUSPEND 509afe761f8SDave Gerlach suspend_set_ops(&am33xx_pm_ops); 510afe761f8SDave Gerlach 51174655749SDave Gerlach /* 51274655749SDave Gerlach * For a system suspend we must flush the caches, we want 51374655749SDave Gerlach * the DDR in self-refresh, we want to save the context 51474655749SDave Gerlach * of the EMIF, and we want the wkup_m3 to handle low-power 51574655749SDave Gerlach * transition. 51674655749SDave Gerlach */ 51774655749SDave Gerlach suspend_wfi_flags |= WFI_FLAG_FLUSH_CACHE; 51874655749SDave Gerlach suspend_wfi_flags |= WFI_FLAG_SELF_REFRESH; 51974655749SDave Gerlach suspend_wfi_flags |= WFI_FLAG_SAVE_EMIF; 52074655749SDave Gerlach suspend_wfi_flags |= WFI_FLAG_WAKE_M3; 5215a99ae00SKeerthy #endif /* CONFIG_SUSPEND */ 52274655749SDave Gerlach 5236afaff1cSDave Gerlach ret = pm_ops->init(am33xx_do_sram_idle); 524afe761f8SDave Gerlach if (ret) { 525afe761f8SDave Gerlach dev_err(dev, "Unable to call core pm init!\n"); 526afe761f8SDave Gerlach ret = -ENODEV; 527afe761f8SDave Gerlach goto err_put_wkup_m3_ipc; 528afe761f8SDave Gerlach } 529afe761f8SDave Gerlach 530afe761f8SDave Gerlach return 0; 531afe761f8SDave Gerlach 532afe761f8SDave Gerlach err_put_wkup_m3_ipc: 533afe761f8SDave Gerlach wkup_m3_ipc_put(m3_ipc); 534afe761f8SDave Gerlach err_free_sram: 535afe761f8SDave Gerlach am33xx_pm_free_sram(); 536afe761f8SDave Gerlach pm33xx_dev = NULL; 537afe761f8SDave Gerlach return ret; 538afe761f8SDave Gerlach } 539afe761f8SDave Gerlach 540afe761f8SDave Gerlach static int am33xx_pm_remove(struct platform_device *pdev) 541afe761f8SDave Gerlach { 5426afaff1cSDave Gerlach if (pm_ops->deinit) 5436afaff1cSDave Gerlach pm_ops->deinit(); 544afe761f8SDave Gerlach suspend_set_ops(NULL); 545afe761f8SDave Gerlach wkup_m3_ipc_put(m3_ipc); 546afe761f8SDave Gerlach am33xx_pm_free_sram(); 547afe761f8SDave Gerlach return 0; 548afe761f8SDave Gerlach } 549afe761f8SDave Gerlach 550afe761f8SDave Gerlach static struct platform_driver am33xx_pm_driver = { 551afe761f8SDave Gerlach .driver = { 552afe761f8SDave Gerlach .name = "pm33xx", 553afe761f8SDave Gerlach }, 554afe761f8SDave Gerlach .probe = am33xx_pm_probe, 555afe761f8SDave Gerlach .remove = am33xx_pm_remove, 556afe761f8SDave Gerlach }; 557afe761f8SDave Gerlach module_platform_driver(am33xx_pm_driver); 558afe761f8SDave Gerlach 559afe761f8SDave Gerlach MODULE_ALIAS("platform:pm33xx"); 560afe761f8SDave Gerlach MODULE_LICENSE("GPL v2"); 561afe761f8SDave Gerlach MODULE_DESCRIPTION("am33xx power management driver"); 562