diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/soc/ti/pm33xx.c | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/drivers/soc/ti/pm33xx.c b/drivers/soc/ti/pm33xx.c new file mode 100644 index 000000000..d0dab3236 --- /dev/null +++ b/drivers/soc/ti/pm33xx.c @@ -0,0 +1,363 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * AM33XX Power Management Routines + * + * Copyright (C) 2012-2018 Texas Instruments Incorporated - http://www.ti.com/ + * Vaibhav Bedia, Dave Gerlach + */ + +#include <linux/cpu.h> +#include <linux/err.h> +#include <linux/genalloc.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_data/pm33xx.h> +#include <linux/platform_device.h> +#include <linux/sizes.h> +#include <linux/sram.h> +#include <linux/suspend.h> +#include <linux/ti-emif-sram.h> +#include <linux/wkup_m3_ipc.h> + +#include <asm/proc-fns.h> +#include <asm/suspend.h> +#include <asm/system_misc.h> + +#define AMX3_PM_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \ + (unsigned long)pm_sram->do_wfi) + +static int (*am33xx_do_wfi_sram)(unsigned long unused); +static phys_addr_t am33xx_do_wfi_sram_phys; + +static struct gen_pool *sram_pool, *sram_pool_data; +static unsigned long ocmcram_location, ocmcram_location_data; + +static struct am33xx_pm_platform_data *pm_ops; +static struct am33xx_pm_sram_addr *pm_sram; + +static struct device *pm33xx_dev; +static struct wkup_m3_ipc *m3_ipc; + +static unsigned long suspend_wfi_flags; + +static u32 sram_suspend_address(unsigned long addr) +{ + return ((unsigned long)am33xx_do_wfi_sram + + AMX3_PM_SRAM_SYMBOL_OFFSET(addr)); +} + +#ifdef CONFIG_SUSPEND +static int am33xx_pm_suspend(suspend_state_t suspend_state) +{ + int i, ret = 0; + + ret = pm_ops->soc_suspend((unsigned long)suspend_state, + am33xx_do_wfi_sram, suspend_wfi_flags); + + if (ret) { + dev_err(pm33xx_dev, "PM: Kernel suspend failure\n"); + } else { + i = m3_ipc->ops->request_pm_status(m3_ipc); + + switch (i) { + case 0: + dev_info(pm33xx_dev, + "PM: Successfully put all powerdomains to target state\n"); + break; + case 1: + dev_err(pm33xx_dev, + "PM: Could not transition all powerdomains to target state\n"); + ret = -1; + break; + default: + dev_err(pm33xx_dev, + "PM: CM3 returned unknown result = %d\n", i); + ret = -1; + } + } + + return ret; +} + +static int am33xx_pm_enter(suspend_state_t suspend_state) +{ + int ret = 0; + + switch (suspend_state) { + case PM_SUSPEND_MEM: + case PM_SUSPEND_STANDBY: + ret = am33xx_pm_suspend(suspend_state); + break; + default: + ret = -EINVAL; + } + + return ret; +} + +static int am33xx_pm_begin(suspend_state_t state) +{ + int ret = -EINVAL; + + switch (state) { + case PM_SUSPEND_MEM: + ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_DEEPSLEEP); + break; + case PM_SUSPEND_STANDBY: + ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_STANDBY); + break; + } + + return ret; +} + +static void am33xx_pm_end(void) +{ + m3_ipc->ops->finish_low_power(m3_ipc); +} + +static int am33xx_pm_valid(suspend_state_t state) +{ + switch (state) { + case PM_SUSPEND_STANDBY: + case PM_SUSPEND_MEM: + return 1; + default: + return 0; + } +} + +static const struct platform_suspend_ops am33xx_pm_ops = { + .begin = am33xx_pm_begin, + .end = am33xx_pm_end, + .enter = am33xx_pm_enter, + .valid = am33xx_pm_valid, +}; +#endif /* CONFIG_SUSPEND */ + +static void am33xx_pm_set_ipc_ops(void) +{ + u32 resume_address; + int temp; + + temp = ti_emif_get_mem_type(); + if (temp < 0) { + dev_err(pm33xx_dev, "PM: Cannot determine memory type, no PM available\n"); + return; + } + m3_ipc->ops->set_mem_type(m3_ipc, temp); + + /* Physical resume address to be used by ROM code */ + resume_address = am33xx_do_wfi_sram_phys + + *pm_sram->resume_offset + 0x4; + + m3_ipc->ops->set_resume_address(m3_ipc, (void *)resume_address); +} + +static void am33xx_pm_free_sram(void) +{ + gen_pool_free(sram_pool, ocmcram_location, *pm_sram->do_wfi_sz); + gen_pool_free(sram_pool_data, ocmcram_location_data, + sizeof(struct am33xx_pm_ro_sram_data)); +} + +/* + * Push the minimal suspend-resume code to SRAM + */ +static int am33xx_pm_alloc_sram(void) +{ + struct device_node *np; + int ret = 0; + + np = of_find_compatible_node(NULL, NULL, "ti,omap3-mpu"); + if (!np) { + np = of_find_compatible_node(NULL, NULL, "ti,omap4-mpu"); + if (!np) { + dev_err(pm33xx_dev, "PM: %s: Unable to find device node for mpu\n", + __func__); + return -ENODEV; + } + } + + sram_pool = of_gen_pool_get(np, "pm-sram", 0); + if (!sram_pool) { + dev_err(pm33xx_dev, "PM: %s: Unable to get sram pool for ocmcram\n", + __func__); + ret = -ENODEV; + goto mpu_put_node; + } + + sram_pool_data = of_gen_pool_get(np, "pm-sram", 1); + if (!sram_pool_data) { + dev_err(pm33xx_dev, "PM: %s: Unable to get sram data pool for ocmcram\n", + __func__); + ret = -ENODEV; + goto mpu_put_node; + } + + ocmcram_location = gen_pool_alloc(sram_pool, *pm_sram->do_wfi_sz); + if (!ocmcram_location) { + dev_err(pm33xx_dev, "PM: %s: Unable to allocate memory from ocmcram\n", + __func__); + ret = -ENOMEM; + goto mpu_put_node; + } + + ocmcram_location_data = gen_pool_alloc(sram_pool_data, + sizeof(struct emif_regs_amx3)); + if (!ocmcram_location_data) { + dev_err(pm33xx_dev, "PM: Unable to allocate memory from ocmcram\n"); + gen_pool_free(sram_pool, ocmcram_location, *pm_sram->do_wfi_sz); + ret = -ENOMEM; + } + +mpu_put_node: + of_node_put(np); + return ret; +} + +static int am33xx_push_sram_idle(void) +{ + struct am33xx_pm_ro_sram_data ro_sram_data; + int ret; + u32 table_addr, ro_data_addr; + void *copy_addr; + + ro_sram_data.amx3_pm_sram_data_virt = ocmcram_location_data; + ro_sram_data.amx3_pm_sram_data_phys = + gen_pool_virt_to_phys(sram_pool_data, ocmcram_location_data); + ro_sram_data.rtc_base_virt = pm_ops->get_rtc_base_addr(); + + /* Save physical address to calculate resume offset during pm init */ + am33xx_do_wfi_sram_phys = gen_pool_virt_to_phys(sram_pool, + ocmcram_location); + + am33xx_do_wfi_sram = sram_exec_copy(sram_pool, (void *)ocmcram_location, + pm_sram->do_wfi, + *pm_sram->do_wfi_sz); + if (!am33xx_do_wfi_sram) { + dev_err(pm33xx_dev, + "PM: %s: am33xx_do_wfi copy to sram failed\n", + __func__); + return -ENODEV; + } + + table_addr = + sram_suspend_address((unsigned long)pm_sram->emif_sram_table); + ret = ti_emif_copy_pm_function_table(sram_pool, (void *)table_addr); + if (ret) { + dev_dbg(pm33xx_dev, + "PM: %s: EMIF function copy failed\n", __func__); + return -EPROBE_DEFER; + } + + ro_data_addr = + sram_suspend_address((unsigned long)pm_sram->ro_sram_data); + copy_addr = sram_exec_copy(sram_pool, (void *)ro_data_addr, + &ro_sram_data, + sizeof(ro_sram_data)); + if (!copy_addr) { + dev_err(pm33xx_dev, + "PM: %s: ro_sram_data copy to sram failed\n", + __func__); + return -ENODEV; + } + + return 0; +} + +static int am33xx_pm_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + int ret; + + if (!of_machine_is_compatible("ti,am33xx") && + !of_machine_is_compatible("ti,am43")) + return -ENODEV; + + pm_ops = dev->platform_data; + if (!pm_ops) { + dev_err(dev, "PM: Cannot get core PM ops!\n"); + return -ENODEV; + } + + pm_sram = pm_ops->get_sram_addrs(); + if (!pm_sram) { + dev_err(dev, "PM: Cannot get PM asm function addresses!!\n"); + return -ENODEV; + } + + pm33xx_dev = dev; + + ret = am33xx_pm_alloc_sram(); + if (ret) + return ret; + + ret = am33xx_push_sram_idle(); + if (ret) + goto err_free_sram; + + m3_ipc = wkup_m3_ipc_get(); + if (!m3_ipc) { + dev_dbg(dev, "PM: Cannot get wkup_m3_ipc handle\n"); + ret = -EPROBE_DEFER; + goto err_free_sram; + } + + am33xx_pm_set_ipc_ops(); + +#ifdef CONFIG_SUSPEND + suspend_set_ops(&am33xx_pm_ops); +#endif /* CONFIG_SUSPEND */ + + /* + * For a system suspend we must flush the caches, we want + * the DDR in self-refresh, we want to save the context + * of the EMIF, and we want the wkup_m3 to handle low-power + * transition. + */ + suspend_wfi_flags |= WFI_FLAG_FLUSH_CACHE; + suspend_wfi_flags |= WFI_FLAG_SELF_REFRESH; + suspend_wfi_flags |= WFI_FLAG_SAVE_EMIF; + suspend_wfi_flags |= WFI_FLAG_WAKE_M3; + + ret = pm_ops->init(); + if (ret) { + dev_err(dev, "Unable to call core pm init!\n"); + ret = -ENODEV; + goto err_put_wkup_m3_ipc; + } + + return 0; + +err_put_wkup_m3_ipc: + wkup_m3_ipc_put(m3_ipc); +err_free_sram: + am33xx_pm_free_sram(); + pm33xx_dev = NULL; + return ret; +} + +static int am33xx_pm_remove(struct platform_device *pdev) +{ + suspend_set_ops(NULL); + wkup_m3_ipc_put(m3_ipc); + am33xx_pm_free_sram(); + return 0; +} + +static struct platform_driver am33xx_pm_driver = { + .driver = { + .name = "pm33xx", + }, + .probe = am33xx_pm_probe, + .remove = am33xx_pm_remove, +}; +module_platform_driver(am33xx_pm_driver); + +MODULE_ALIAS("platform:pm33xx"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("am33xx power management driver"); |