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