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> 192152fbbdSTony Lindgren #include <linux/of_address.h> 20afe761f8SDave Gerlach #include <linux/platform_data/pm33xx.h> 21afe761f8SDave Gerlach #include <linux/platform_device.h> 225a99ae00SKeerthy #include <linux/rtc.h> 235a99ae00SKeerthy #include <linux/rtc/rtc-omap.h> 24afe761f8SDave Gerlach #include <linux/sizes.h> 25afe761f8SDave Gerlach #include <linux/sram.h> 26afe761f8SDave Gerlach #include <linux/suspend.h> 27afe761f8SDave Gerlach #include <linux/ti-emif-sram.h> 28afe761f8SDave Gerlach #include <linux/wkup_m3_ipc.h> 29afe761f8SDave Gerlach 30afe761f8SDave Gerlach #include <asm/proc-fns.h> 31afe761f8SDave Gerlach #include <asm/suspend.h> 32afe761f8SDave Gerlach #include <asm/system_misc.h> 33afe761f8SDave Gerlach 34afe761f8SDave Gerlach #define AMX3_PM_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \ 35afe761f8SDave Gerlach (unsigned long)pm_sram->do_wfi) 36afe761f8SDave Gerlach 375a99ae00SKeerthy #define RTC_SCRATCH_RESUME_REG 0 385a99ae00SKeerthy #define RTC_SCRATCH_MAGIC_REG 1 395a99ae00SKeerthy #define RTC_REG_BOOT_MAGIC 0x8cd0 /* RTC */ 405a99ae00SKeerthy #define GIC_INT_SET_PENDING_BASE 0x200 415a99ae00SKeerthy #define AM43XX_GIC_DIST_BASE 0x48241000 425a99ae00SKeerthy 432152fbbdSTony Lindgren static void __iomem *rtc_base_virt; 442152fbbdSTony Lindgren static struct clk *rtc_fck; 455a99ae00SKeerthy static u32 rtc_magic_val; 465a99ae00SKeerthy 47afe761f8SDave Gerlach static int (*am33xx_do_wfi_sram)(unsigned long unused); 48afe761f8SDave Gerlach static phys_addr_t am33xx_do_wfi_sram_phys; 49afe761f8SDave Gerlach 50afe761f8SDave Gerlach static struct gen_pool *sram_pool, *sram_pool_data; 51afe761f8SDave Gerlach static unsigned long ocmcram_location, ocmcram_location_data; 52afe761f8SDave Gerlach 535a99ae00SKeerthy static struct rtc_device *omap_rtc; 545a99ae00SKeerthy static void __iomem *gic_dist_base; 555a99ae00SKeerthy 56afe761f8SDave Gerlach static struct am33xx_pm_platform_data *pm_ops; 57afe761f8SDave Gerlach static struct am33xx_pm_sram_addr *pm_sram; 58afe761f8SDave Gerlach 59afe761f8SDave Gerlach static struct device *pm33xx_dev; 60afe761f8SDave Gerlach static struct wkup_m3_ipc *m3_ipc; 61afe761f8SDave Gerlach 625a99ae00SKeerthy #ifdef CONFIG_SUSPEND 635a99ae00SKeerthy static int rtc_only_idle; 645a99ae00SKeerthy static int retrigger_irq; 6574655749SDave Gerlach static unsigned long suspend_wfi_flags; 6674655749SDave Gerlach 675a99ae00SKeerthy static struct wkup_m3_wakeup_src wakeup_src = {.irq_nr = 0, 685a99ae00SKeerthy .src = "Unknown", 695a99ae00SKeerthy }; 705a99ae00SKeerthy 715a99ae00SKeerthy static struct wkup_m3_wakeup_src rtc_alarm_wakeup = { 725a99ae00SKeerthy .irq_nr = 108, .src = "RTC Alarm", 735a99ae00SKeerthy }; 745a99ae00SKeerthy 755a99ae00SKeerthy static struct wkup_m3_wakeup_src rtc_ext_wakeup = { 765a99ae00SKeerthy .irq_nr = 0, .src = "Ext wakeup", 775a99ae00SKeerthy }; 785a99ae00SKeerthy #endif 795a99ae00SKeerthy 80afe761f8SDave Gerlach static u32 sram_suspend_address(unsigned long addr) 81afe761f8SDave Gerlach { 82afe761f8SDave Gerlach return ((unsigned long)am33xx_do_wfi_sram + 83afe761f8SDave Gerlach AMX3_PM_SRAM_SYMBOL_OFFSET(addr)); 84afe761f8SDave Gerlach } 85afe761f8SDave Gerlach 861c6c0354SKeerthy static int am33xx_push_sram_idle(void) 871c6c0354SKeerthy { 881c6c0354SKeerthy struct am33xx_pm_ro_sram_data ro_sram_data; 891c6c0354SKeerthy int ret; 901c6c0354SKeerthy u32 table_addr, ro_data_addr; 911c6c0354SKeerthy void *copy_addr; 921c6c0354SKeerthy 931c6c0354SKeerthy ro_sram_data.amx3_pm_sram_data_virt = ocmcram_location_data; 941c6c0354SKeerthy ro_sram_data.amx3_pm_sram_data_phys = 951c6c0354SKeerthy gen_pool_virt_to_phys(sram_pool_data, ocmcram_location_data); 962152fbbdSTony Lindgren ro_sram_data.rtc_base_virt = rtc_base_virt; 971c6c0354SKeerthy 981c6c0354SKeerthy /* Save physical address to calculate resume offset during pm init */ 991c6c0354SKeerthy am33xx_do_wfi_sram_phys = gen_pool_virt_to_phys(sram_pool, 1001c6c0354SKeerthy ocmcram_location); 1011c6c0354SKeerthy 1021c6c0354SKeerthy am33xx_do_wfi_sram = sram_exec_copy(sram_pool, (void *)ocmcram_location, 1031c6c0354SKeerthy pm_sram->do_wfi, 1041c6c0354SKeerthy *pm_sram->do_wfi_sz); 1051c6c0354SKeerthy if (!am33xx_do_wfi_sram) { 1061c6c0354SKeerthy dev_err(pm33xx_dev, 1071c6c0354SKeerthy "PM: %s: am33xx_do_wfi copy to sram failed\n", 1081c6c0354SKeerthy __func__); 1091c6c0354SKeerthy return -ENODEV; 1101c6c0354SKeerthy } 1111c6c0354SKeerthy 1121c6c0354SKeerthy table_addr = 1131c6c0354SKeerthy sram_suspend_address((unsigned long)pm_sram->emif_sram_table); 1141c6c0354SKeerthy ret = ti_emif_copy_pm_function_table(sram_pool, (void *)table_addr); 1151c6c0354SKeerthy if (ret) { 1161c6c0354SKeerthy dev_dbg(pm33xx_dev, 1171c6c0354SKeerthy "PM: %s: EMIF function copy failed\n", __func__); 1181c6c0354SKeerthy return -EPROBE_DEFER; 1191c6c0354SKeerthy } 1201c6c0354SKeerthy 1211c6c0354SKeerthy ro_data_addr = 1221c6c0354SKeerthy sram_suspend_address((unsigned long)pm_sram->ro_sram_data); 1231c6c0354SKeerthy copy_addr = sram_exec_copy(sram_pool, (void *)ro_data_addr, 1241c6c0354SKeerthy &ro_sram_data, 1251c6c0354SKeerthy sizeof(ro_sram_data)); 1261c6c0354SKeerthy if (!copy_addr) { 1271c6c0354SKeerthy dev_err(pm33xx_dev, 1281c6c0354SKeerthy "PM: %s: ro_sram_data copy to sram failed\n", 1291c6c0354SKeerthy __func__); 1301c6c0354SKeerthy return -ENODEV; 1311c6c0354SKeerthy } 1321c6c0354SKeerthy 1331c6c0354SKeerthy return 0; 1341c6c0354SKeerthy } 1351c6c0354SKeerthy 1366afaff1cSDave Gerlach static int am33xx_do_sram_idle(u32 wfi_flags) 1376afaff1cSDave Gerlach { 1386afaff1cSDave Gerlach int ret = 0; 1396afaff1cSDave Gerlach 1406afaff1cSDave Gerlach if (!m3_ipc || !pm_ops) 1416afaff1cSDave Gerlach return 0; 1426afaff1cSDave Gerlach 1436afaff1cSDave Gerlach if (wfi_flags & WFI_FLAG_WAKE_M3) 1446afaff1cSDave Gerlach ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_IDLE); 1456afaff1cSDave Gerlach 1466afaff1cSDave Gerlach return pm_ops->cpu_suspend(am33xx_do_wfi_sram, wfi_flags); 1476afaff1cSDave Gerlach } 1486afaff1cSDave Gerlach 1495a99ae00SKeerthy static int __init am43xx_map_gic(void) 1505a99ae00SKeerthy { 1515a99ae00SKeerthy gic_dist_base = ioremap(AM43XX_GIC_DIST_BASE, SZ_4K); 1525a99ae00SKeerthy 1535a99ae00SKeerthy if (!gic_dist_base) 1545a99ae00SKeerthy return -ENOMEM; 1555a99ae00SKeerthy 1565a99ae00SKeerthy return 0; 1575a99ae00SKeerthy } 1585a99ae00SKeerthy 159afe761f8SDave Gerlach #ifdef CONFIG_SUSPEND 1604a65bbb9SYueHaibing static struct wkup_m3_wakeup_src rtc_wake_src(void) 1615a99ae00SKeerthy { 1625a99ae00SKeerthy u32 i; 1635a99ae00SKeerthy 1642152fbbdSTony Lindgren i = __raw_readl(rtc_base_virt + 0x44) & 0x40; 1655a99ae00SKeerthy 1665a99ae00SKeerthy if (i) { 1675a99ae00SKeerthy retrigger_irq = rtc_alarm_wakeup.irq_nr; 1685a99ae00SKeerthy return rtc_alarm_wakeup; 1695a99ae00SKeerthy } 1705a99ae00SKeerthy 1715a99ae00SKeerthy retrigger_irq = rtc_ext_wakeup.irq_nr; 1725a99ae00SKeerthy 1735a99ae00SKeerthy return rtc_ext_wakeup; 1745a99ae00SKeerthy } 1755a99ae00SKeerthy 1764a65bbb9SYueHaibing static int am33xx_rtc_only_idle(unsigned long wfi_flags) 1775a99ae00SKeerthy { 1785a99ae00SKeerthy omap_rtc_power_off_program(&omap_rtc->dev); 1795a99ae00SKeerthy am33xx_do_wfi_sram(wfi_flags); 1805a99ae00SKeerthy return 0; 1815a99ae00SKeerthy } 1825a99ae00SKeerthy 1832152fbbdSTony Lindgren /* 1842152fbbdSTony Lindgren * Note that the RTC module clock must be re-enabled only for rtc+ddr suspend. 1852152fbbdSTony Lindgren * And looks like the module can stay in SYSC_IDLE_SMART_WKUP mode configured 1862152fbbdSTony Lindgren * by the interconnect code just fine for both rtc+ddr suspend and retention 1872152fbbdSTony Lindgren * suspend. 1882152fbbdSTony Lindgren */ 189afe761f8SDave Gerlach static int am33xx_pm_suspend(suspend_state_t suspend_state) 190afe761f8SDave Gerlach { 191afe761f8SDave Gerlach int i, ret = 0; 192afe761f8SDave Gerlach 1935a99ae00SKeerthy if (suspend_state == PM_SUSPEND_MEM && 1945a99ae00SKeerthy pm_ops->check_off_mode_enable()) { 1952152fbbdSTony Lindgren ret = clk_prepare_enable(rtc_fck); 1962152fbbdSTony Lindgren if (ret) { 1972152fbbdSTony Lindgren dev_err(pm33xx_dev, "Failed to enable clock: %i\n", ret); 1982152fbbdSTony Lindgren return ret; 1992152fbbdSTony Lindgren } 2002152fbbdSTony Lindgren 2015a99ae00SKeerthy pm_ops->save_context(); 2025a99ae00SKeerthy suspend_wfi_flags |= WFI_FLAG_RTC_ONLY; 2035a99ae00SKeerthy clk_save_context(); 2045a99ae00SKeerthy ret = pm_ops->soc_suspend(suspend_state, am33xx_rtc_only_idle, 2055a99ae00SKeerthy suspend_wfi_flags); 2065a99ae00SKeerthy 2075a99ae00SKeerthy suspend_wfi_flags &= ~WFI_FLAG_RTC_ONLY; 20845450f36SKeerthy dev_info(pm33xx_dev, "Entering RTC Only mode with DDR in self-refresh\n"); 2095a99ae00SKeerthy 2105a99ae00SKeerthy if (!ret) { 2115a99ae00SKeerthy clk_restore_context(); 2125a99ae00SKeerthy pm_ops->restore_context(); 2135a99ae00SKeerthy m3_ipc->ops->set_rtc_only(m3_ipc); 2145a99ae00SKeerthy am33xx_push_sram_idle(); 2155a99ae00SKeerthy } 2165a99ae00SKeerthy } else { 2175a99ae00SKeerthy ret = pm_ops->soc_suspend(suspend_state, am33xx_do_wfi_sram, 2185a99ae00SKeerthy suspend_wfi_flags); 2195a99ae00SKeerthy } 220afe761f8SDave Gerlach 221afe761f8SDave Gerlach if (ret) { 222afe761f8SDave Gerlach dev_err(pm33xx_dev, "PM: Kernel suspend failure\n"); 223afe761f8SDave Gerlach } else { 224afe761f8SDave Gerlach i = m3_ipc->ops->request_pm_status(m3_ipc); 225afe761f8SDave Gerlach 226afe761f8SDave Gerlach switch (i) { 227afe761f8SDave Gerlach case 0: 228afe761f8SDave Gerlach dev_info(pm33xx_dev, 229afe761f8SDave Gerlach "PM: Successfully put all powerdomains to target state\n"); 230afe761f8SDave Gerlach break; 231afe761f8SDave Gerlach case 1: 232afe761f8SDave Gerlach dev_err(pm33xx_dev, 233afe761f8SDave Gerlach "PM: Could not transition all powerdomains to target state\n"); 234afe761f8SDave Gerlach ret = -1; 235afe761f8SDave Gerlach break; 236afe761f8SDave Gerlach default: 237afe761f8SDave Gerlach dev_err(pm33xx_dev, 238afe761f8SDave Gerlach "PM: CM3 returned unknown result = %d\n", i); 239afe761f8SDave Gerlach ret = -1; 240afe761f8SDave Gerlach } 2415a99ae00SKeerthy 2425a99ae00SKeerthy /* print the wakeup reason */ 2435a99ae00SKeerthy if (rtc_only_idle) { 2445a99ae00SKeerthy wakeup_src = rtc_wake_src(); 2455a99ae00SKeerthy pr_info("PM: Wakeup source %s\n", wakeup_src.src); 2465a99ae00SKeerthy } else { 2475a99ae00SKeerthy pr_info("PM: Wakeup source %s\n", 2485a99ae00SKeerthy m3_ipc->ops->request_wake_src(m3_ipc)); 249afe761f8SDave Gerlach } 2505a99ae00SKeerthy } 2515a99ae00SKeerthy 2525a99ae00SKeerthy if (suspend_state == PM_SUSPEND_MEM && pm_ops->check_off_mode_enable()) 2532152fbbdSTony Lindgren clk_disable_unprepare(rtc_fck); 254afe761f8SDave Gerlach 255afe761f8SDave Gerlach return ret; 256afe761f8SDave Gerlach } 257afe761f8SDave Gerlach 258afe761f8SDave Gerlach static int am33xx_pm_enter(suspend_state_t suspend_state) 259afe761f8SDave Gerlach { 260afe761f8SDave Gerlach int ret = 0; 261afe761f8SDave Gerlach 262afe761f8SDave Gerlach switch (suspend_state) { 263afe761f8SDave Gerlach case PM_SUSPEND_MEM: 264afe761f8SDave Gerlach case PM_SUSPEND_STANDBY: 265afe761f8SDave Gerlach ret = am33xx_pm_suspend(suspend_state); 266afe761f8SDave Gerlach break; 267afe761f8SDave Gerlach default: 268afe761f8SDave Gerlach ret = -EINVAL; 269afe761f8SDave Gerlach } 270afe761f8SDave Gerlach 271afe761f8SDave Gerlach return ret; 272afe761f8SDave Gerlach } 273afe761f8SDave Gerlach 274afe761f8SDave Gerlach static int am33xx_pm_begin(suspend_state_t state) 275afe761f8SDave Gerlach { 276afe761f8SDave Gerlach int ret = -EINVAL; 2775a99ae00SKeerthy struct nvmem_device *nvmem; 2785a99ae00SKeerthy 2795a99ae00SKeerthy if (state == PM_SUSPEND_MEM && pm_ops->check_off_mode_enable()) { 2805a99ae00SKeerthy nvmem = devm_nvmem_device_get(&omap_rtc->dev, 2815a99ae00SKeerthy "omap_rtc_scratch0"); 282d8e0cecbSKeerthy if (!IS_ERR(nvmem)) 2835a99ae00SKeerthy nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4, 4, 2845a99ae00SKeerthy (void *)&rtc_magic_val); 2855a99ae00SKeerthy rtc_only_idle = 1; 2865a99ae00SKeerthy } else { 2875a99ae00SKeerthy rtc_only_idle = 0; 2885a99ae00SKeerthy } 289afe761f8SDave Gerlach 2906afaff1cSDave Gerlach pm_ops->begin_suspend(); 2916afaff1cSDave Gerlach 292afe761f8SDave Gerlach switch (state) { 293afe761f8SDave Gerlach case PM_SUSPEND_MEM: 294afe761f8SDave Gerlach ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_DEEPSLEEP); 295afe761f8SDave Gerlach break; 296afe761f8SDave Gerlach case PM_SUSPEND_STANDBY: 297afe761f8SDave Gerlach ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_STANDBY); 298afe761f8SDave Gerlach break; 299afe761f8SDave Gerlach } 300afe761f8SDave Gerlach 301afe761f8SDave Gerlach return ret; 302afe761f8SDave Gerlach } 303afe761f8SDave Gerlach 304afe761f8SDave Gerlach static void am33xx_pm_end(void) 305afe761f8SDave Gerlach { 3065a99ae00SKeerthy u32 val = 0; 3075a99ae00SKeerthy struct nvmem_device *nvmem; 3085a99ae00SKeerthy 3095a99ae00SKeerthy nvmem = devm_nvmem_device_get(&omap_rtc->dev, "omap_rtc_scratch0"); 310d8e0cecbSKeerthy if (IS_ERR(nvmem)) 311d8e0cecbSKeerthy return; 312d8e0cecbSKeerthy 313afe761f8SDave Gerlach m3_ipc->ops->finish_low_power(m3_ipc); 3145a99ae00SKeerthy if (rtc_only_idle) { 315d8e0cecbSKeerthy if (retrigger_irq) { 3165a99ae00SKeerthy /* 3175a99ae00SKeerthy * 32 bits of Interrupt Set-Pending correspond to 32 3185a99ae00SKeerthy * 32 interrupts. Compute the bit offset of the 3195a99ae00SKeerthy * Interrupt and set that particular bit 3205a99ae00SKeerthy * Compute the register offset by dividing interrupt 3215a99ae00SKeerthy * number by 32 and mutiplying by 4 3225a99ae00SKeerthy */ 3235a99ae00SKeerthy writel_relaxed(1 << (retrigger_irq & 31), 3245a99ae00SKeerthy gic_dist_base + GIC_INT_SET_PENDING_BASE 3255a99ae00SKeerthy + retrigger_irq / 32 * 4); 326d8e0cecbSKeerthy } 327d8e0cecbSKeerthy 3285a99ae00SKeerthy nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4, 4, 3295a99ae00SKeerthy (void *)&val); 3305a99ae00SKeerthy } 3315a99ae00SKeerthy 3325a99ae00SKeerthy rtc_only_idle = 0; 3336afaff1cSDave Gerlach 3346afaff1cSDave Gerlach pm_ops->finish_suspend(); 335afe761f8SDave Gerlach } 336afe761f8SDave Gerlach 337afe761f8SDave Gerlach static int am33xx_pm_valid(suspend_state_t state) 338afe761f8SDave Gerlach { 339afe761f8SDave Gerlach switch (state) { 340afe761f8SDave Gerlach case PM_SUSPEND_STANDBY: 341afe761f8SDave Gerlach case PM_SUSPEND_MEM: 342afe761f8SDave Gerlach return 1; 343afe761f8SDave Gerlach default: 344afe761f8SDave Gerlach return 0; 345afe761f8SDave Gerlach } 346afe761f8SDave Gerlach } 347afe761f8SDave Gerlach 348afe761f8SDave Gerlach static const struct platform_suspend_ops am33xx_pm_ops = { 349afe761f8SDave Gerlach .begin = am33xx_pm_begin, 350afe761f8SDave Gerlach .end = am33xx_pm_end, 351afe761f8SDave Gerlach .enter = am33xx_pm_enter, 352afe761f8SDave Gerlach .valid = am33xx_pm_valid, 353afe761f8SDave Gerlach }; 354afe761f8SDave Gerlach #endif /* CONFIG_SUSPEND */ 355afe761f8SDave Gerlach 356afe761f8SDave Gerlach static void am33xx_pm_set_ipc_ops(void) 357afe761f8SDave Gerlach { 358afe761f8SDave Gerlach u32 resume_address; 359afe761f8SDave Gerlach int temp; 360afe761f8SDave Gerlach 361afe761f8SDave Gerlach temp = ti_emif_get_mem_type(); 362afe761f8SDave Gerlach if (temp < 0) { 363afe761f8SDave Gerlach dev_err(pm33xx_dev, "PM: Cannot determine memory type, no PM available\n"); 364afe761f8SDave Gerlach return; 365afe761f8SDave Gerlach } 366afe761f8SDave Gerlach m3_ipc->ops->set_mem_type(m3_ipc, temp); 367afe761f8SDave Gerlach 368afe761f8SDave Gerlach /* Physical resume address to be used by ROM code */ 369afe761f8SDave Gerlach resume_address = am33xx_do_wfi_sram_phys + 370afe761f8SDave Gerlach *pm_sram->resume_offset + 0x4; 371afe761f8SDave Gerlach 372afe761f8SDave Gerlach m3_ipc->ops->set_resume_address(m3_ipc, (void *)resume_address); 373afe761f8SDave Gerlach } 374afe761f8SDave Gerlach 375afe761f8SDave Gerlach static void am33xx_pm_free_sram(void) 376afe761f8SDave Gerlach { 377afe761f8SDave Gerlach gen_pool_free(sram_pool, ocmcram_location, *pm_sram->do_wfi_sz); 378afe761f8SDave Gerlach gen_pool_free(sram_pool_data, ocmcram_location_data, 379afe761f8SDave Gerlach sizeof(struct am33xx_pm_ro_sram_data)); 380afe761f8SDave Gerlach } 381afe761f8SDave Gerlach 382afe761f8SDave Gerlach /* 383afe761f8SDave Gerlach * Push the minimal suspend-resume code to SRAM 384afe761f8SDave Gerlach */ 385afe761f8SDave Gerlach static int am33xx_pm_alloc_sram(void) 386afe761f8SDave Gerlach { 387afe761f8SDave Gerlach struct device_node *np; 388afe761f8SDave Gerlach int ret = 0; 389afe761f8SDave Gerlach 390afe761f8SDave Gerlach np = of_find_compatible_node(NULL, NULL, "ti,omap3-mpu"); 391afe761f8SDave Gerlach if (!np) { 392afe761f8SDave Gerlach np = of_find_compatible_node(NULL, NULL, "ti,omap4-mpu"); 393afe761f8SDave Gerlach if (!np) { 394afe761f8SDave Gerlach dev_err(pm33xx_dev, "PM: %s: Unable to find device node for mpu\n", 395afe761f8SDave Gerlach __func__); 396afe761f8SDave Gerlach return -ENODEV; 397afe761f8SDave Gerlach } 398afe761f8SDave Gerlach } 399afe761f8SDave Gerlach 400afe761f8SDave Gerlach sram_pool = of_gen_pool_get(np, "pm-sram", 0); 401afe761f8SDave Gerlach if (!sram_pool) { 402afe761f8SDave Gerlach dev_err(pm33xx_dev, "PM: %s: Unable to get sram pool for ocmcram\n", 403afe761f8SDave Gerlach __func__); 404afe761f8SDave Gerlach ret = -ENODEV; 405afe761f8SDave Gerlach goto mpu_put_node; 406afe761f8SDave Gerlach } 407afe761f8SDave Gerlach 408afe761f8SDave Gerlach sram_pool_data = of_gen_pool_get(np, "pm-sram", 1); 409afe761f8SDave Gerlach if (!sram_pool_data) { 410afe761f8SDave Gerlach dev_err(pm33xx_dev, "PM: %s: Unable to get sram data pool for ocmcram\n", 411afe761f8SDave Gerlach __func__); 412afe761f8SDave Gerlach ret = -ENODEV; 413afe761f8SDave Gerlach goto mpu_put_node; 414afe761f8SDave Gerlach } 415afe761f8SDave Gerlach 416afe761f8SDave Gerlach ocmcram_location = gen_pool_alloc(sram_pool, *pm_sram->do_wfi_sz); 417afe761f8SDave Gerlach if (!ocmcram_location) { 418afe761f8SDave Gerlach dev_err(pm33xx_dev, "PM: %s: Unable to allocate memory from ocmcram\n", 419afe761f8SDave Gerlach __func__); 420afe761f8SDave Gerlach ret = -ENOMEM; 421afe761f8SDave Gerlach goto mpu_put_node; 422afe761f8SDave Gerlach } 423afe761f8SDave Gerlach 424afe761f8SDave Gerlach ocmcram_location_data = gen_pool_alloc(sram_pool_data, 425afe761f8SDave Gerlach sizeof(struct emif_regs_amx3)); 426afe761f8SDave Gerlach if (!ocmcram_location_data) { 427afe761f8SDave Gerlach dev_err(pm33xx_dev, "PM: Unable to allocate memory from ocmcram\n"); 428afe761f8SDave Gerlach gen_pool_free(sram_pool, ocmcram_location, *pm_sram->do_wfi_sz); 429afe761f8SDave Gerlach ret = -ENOMEM; 430afe761f8SDave Gerlach } 431afe761f8SDave Gerlach 432afe761f8SDave Gerlach mpu_put_node: 433afe761f8SDave Gerlach of_node_put(np); 434afe761f8SDave Gerlach return ret; 435afe761f8SDave Gerlach } 436afe761f8SDave Gerlach 4375a99ae00SKeerthy static int am33xx_pm_rtc_setup(void) 4385a99ae00SKeerthy { 4395a99ae00SKeerthy struct device_node *np; 4405a99ae00SKeerthy unsigned long val = 0; 4415a99ae00SKeerthy struct nvmem_device *nvmem; 4422152fbbdSTony Lindgren int error; 4435a99ae00SKeerthy 4445a99ae00SKeerthy np = of_find_node_by_name(NULL, "rtc"); 4455a99ae00SKeerthy 4465a99ae00SKeerthy if (of_device_is_available(np)) { 4472152fbbdSTony Lindgren /* RTC interconnect target module clock */ 4482152fbbdSTony Lindgren rtc_fck = of_clk_get_by_name(np->parent, "fck"); 4492152fbbdSTony Lindgren if (IS_ERR(rtc_fck)) 4502152fbbdSTony Lindgren return PTR_ERR(rtc_fck); 4512152fbbdSTony Lindgren 4522152fbbdSTony Lindgren rtc_base_virt = of_iomap(np, 0); 4532152fbbdSTony Lindgren if (!rtc_base_virt) { 4542152fbbdSTony Lindgren pr_warn("PM: could not iomap rtc"); 4552152fbbdSTony Lindgren error = -ENODEV; 4562152fbbdSTony Lindgren goto err_clk_put; 4572152fbbdSTony Lindgren } 4582152fbbdSTony Lindgren 4595a99ae00SKeerthy omap_rtc = rtc_class_open("rtc0"); 4605a99ae00SKeerthy if (!omap_rtc) { 4615a99ae00SKeerthy pr_warn("PM: rtc0 not available"); 4622152fbbdSTony Lindgren error = -EPROBE_DEFER; 4632152fbbdSTony Lindgren goto err_iounmap; 4645a99ae00SKeerthy } 4655a99ae00SKeerthy 4665a99ae00SKeerthy nvmem = devm_nvmem_device_get(&omap_rtc->dev, 4675a99ae00SKeerthy "omap_rtc_scratch0"); 468d8e0cecbSKeerthy if (!IS_ERR(nvmem)) { 4695a99ae00SKeerthy nvmem_device_read(nvmem, RTC_SCRATCH_MAGIC_REG * 4, 4705a99ae00SKeerthy 4, (void *)&rtc_magic_val); 4715a99ae00SKeerthy if ((rtc_magic_val & 0xffff) != RTC_REG_BOOT_MAGIC) 4725a99ae00SKeerthy pr_warn("PM: bootloader does not support rtc-only!\n"); 4735a99ae00SKeerthy 4745a99ae00SKeerthy nvmem_device_write(nvmem, RTC_SCRATCH_MAGIC_REG * 4, 4755a99ae00SKeerthy 4, (void *)&val); 4765a99ae00SKeerthy val = pm_sram->resume_address; 4775a99ae00SKeerthy nvmem_device_write(nvmem, RTC_SCRATCH_RESUME_REG * 4, 4785a99ae00SKeerthy 4, (void *)&val); 4795a99ae00SKeerthy } 4805a99ae00SKeerthy } else { 4815a99ae00SKeerthy pr_warn("PM: no-rtc available, rtc-only mode disabled.\n"); 4825a99ae00SKeerthy } 4835a99ae00SKeerthy 4845a99ae00SKeerthy return 0; 4852152fbbdSTony Lindgren 4862152fbbdSTony Lindgren err_iounmap: 4872152fbbdSTony Lindgren iounmap(rtc_base_virt); 4882152fbbdSTony Lindgren err_clk_put: 4892152fbbdSTony Lindgren clk_put(rtc_fck); 4902152fbbdSTony Lindgren 4912152fbbdSTony Lindgren return error; 4925a99ae00SKeerthy } 4935a99ae00SKeerthy 494afe761f8SDave Gerlach static int am33xx_pm_probe(struct platform_device *pdev) 495afe761f8SDave Gerlach { 496afe761f8SDave Gerlach struct device *dev = &pdev->dev; 497afe761f8SDave Gerlach int ret; 498afe761f8SDave Gerlach 499afe761f8SDave Gerlach if (!of_machine_is_compatible("ti,am33xx") && 500afe761f8SDave Gerlach !of_machine_is_compatible("ti,am43")) 501afe761f8SDave Gerlach return -ENODEV; 502afe761f8SDave Gerlach 503afe761f8SDave Gerlach pm_ops = dev->platform_data; 504afe761f8SDave Gerlach if (!pm_ops) { 505afe761f8SDave Gerlach dev_err(dev, "PM: Cannot get core PM ops!\n"); 506afe761f8SDave Gerlach return -ENODEV; 507afe761f8SDave Gerlach } 508afe761f8SDave Gerlach 5095a99ae00SKeerthy ret = am43xx_map_gic(); 5105a99ae00SKeerthy if (ret) { 5115a99ae00SKeerthy pr_err("PM: Could not ioremap GIC base\n"); 5125a99ae00SKeerthy return ret; 5135a99ae00SKeerthy } 5145a99ae00SKeerthy 515afe761f8SDave Gerlach pm_sram = pm_ops->get_sram_addrs(); 516afe761f8SDave Gerlach if (!pm_sram) { 517afe761f8SDave Gerlach dev_err(dev, "PM: Cannot get PM asm function addresses!!\n"); 518afe761f8SDave Gerlach return -ENODEV; 519afe761f8SDave Gerlach } 520afe761f8SDave Gerlach 5215a99ae00SKeerthy m3_ipc = wkup_m3_ipc_get(); 5225a99ae00SKeerthy if (!m3_ipc) { 5235a99ae00SKeerthy pr_err("PM: Cannot get wkup_m3_ipc handle\n"); 5245a99ae00SKeerthy return -EPROBE_DEFER; 5255a99ae00SKeerthy } 5265a99ae00SKeerthy 527afe761f8SDave Gerlach pm33xx_dev = dev; 528afe761f8SDave Gerlach 529afe761f8SDave Gerlach ret = am33xx_pm_alloc_sram(); 530afe761f8SDave Gerlach if (ret) 531afe761f8SDave Gerlach return ret; 532afe761f8SDave Gerlach 5335a99ae00SKeerthy ret = am33xx_pm_rtc_setup(); 534afe761f8SDave Gerlach if (ret) 535afe761f8SDave Gerlach goto err_free_sram; 536afe761f8SDave Gerlach 5375a99ae00SKeerthy ret = am33xx_push_sram_idle(); 5385a99ae00SKeerthy if (ret) 539afe761f8SDave Gerlach goto err_free_sram; 540afe761f8SDave Gerlach 541afe761f8SDave Gerlach am33xx_pm_set_ipc_ops(); 542afe761f8SDave Gerlach 543afe761f8SDave Gerlach #ifdef CONFIG_SUSPEND 544afe761f8SDave Gerlach suspend_set_ops(&am33xx_pm_ops); 545afe761f8SDave Gerlach 54674655749SDave Gerlach /* 54774655749SDave Gerlach * For a system suspend we must flush the caches, we want 54874655749SDave Gerlach * the DDR in self-refresh, we want to save the context 54974655749SDave Gerlach * of the EMIF, and we want the wkup_m3 to handle low-power 55074655749SDave Gerlach * transition. 55174655749SDave Gerlach */ 55274655749SDave Gerlach suspend_wfi_flags |= WFI_FLAG_FLUSH_CACHE; 55374655749SDave Gerlach suspend_wfi_flags |= WFI_FLAG_SELF_REFRESH; 55474655749SDave Gerlach suspend_wfi_flags |= WFI_FLAG_SAVE_EMIF; 55574655749SDave Gerlach suspend_wfi_flags |= WFI_FLAG_WAKE_M3; 5565a99ae00SKeerthy #endif /* CONFIG_SUSPEND */ 55774655749SDave Gerlach 5586afaff1cSDave Gerlach ret = pm_ops->init(am33xx_do_sram_idle); 559afe761f8SDave Gerlach if (ret) { 560afe761f8SDave Gerlach dev_err(dev, "Unable to call core pm init!\n"); 561afe761f8SDave Gerlach ret = -ENODEV; 562afe761f8SDave Gerlach goto err_put_wkup_m3_ipc; 563afe761f8SDave Gerlach } 564afe761f8SDave Gerlach 565afe761f8SDave Gerlach return 0; 566afe761f8SDave Gerlach 567afe761f8SDave Gerlach err_put_wkup_m3_ipc: 568afe761f8SDave Gerlach wkup_m3_ipc_put(m3_ipc); 569afe761f8SDave Gerlach err_free_sram: 570afe761f8SDave Gerlach am33xx_pm_free_sram(); 571afe761f8SDave Gerlach pm33xx_dev = NULL; 572afe761f8SDave Gerlach return ret; 573afe761f8SDave Gerlach } 574afe761f8SDave Gerlach 575afe761f8SDave Gerlach static int am33xx_pm_remove(struct platform_device *pdev) 576afe761f8SDave Gerlach { 5776afaff1cSDave Gerlach if (pm_ops->deinit) 5786afaff1cSDave Gerlach pm_ops->deinit(); 579afe761f8SDave Gerlach suspend_set_ops(NULL); 580afe761f8SDave Gerlach wkup_m3_ipc_put(m3_ipc); 581afe761f8SDave Gerlach am33xx_pm_free_sram(); 5822152fbbdSTony Lindgren iounmap(rtc_base_virt); 5832152fbbdSTony Lindgren clk_put(rtc_fck); 584afe761f8SDave Gerlach return 0; 585afe761f8SDave Gerlach } 586afe761f8SDave Gerlach 587afe761f8SDave Gerlach static struct platform_driver am33xx_pm_driver = { 588afe761f8SDave Gerlach .driver = { 589afe761f8SDave Gerlach .name = "pm33xx", 590afe761f8SDave Gerlach }, 591afe761f8SDave Gerlach .probe = am33xx_pm_probe, 592afe761f8SDave Gerlach .remove = am33xx_pm_remove, 593afe761f8SDave Gerlach }; 594afe761f8SDave Gerlach module_platform_driver(am33xx_pm_driver); 595afe761f8SDave Gerlach 596afe761f8SDave Gerlach MODULE_ALIAS("platform:pm33xx"); 597afe761f8SDave Gerlach MODULE_LICENSE("GPL v2"); 598afe761f8SDave Gerlach MODULE_DESCRIPTION("am33xx power management driver"); 599