forked from luck/tmp_suning_uos_patched
9952f6918d
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 228 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528171438.107155473@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
138 lines
3.0 KiB
C
138 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* arch/arm/mach-socfpga/pm.c
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*
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* Copyright (C) 2014-2015 Altera Corporation. All rights reserved.
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*
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* with code from pm-imx6.c
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* Copyright 2011-2014 Freescale Semiconductor, Inc.
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* Copyright 2011 Linaro Ltd.
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*/
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#include <linux/bitops.h>
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#include <linux/genalloc.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/of_platform.h>
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#include <linux/suspend.h>
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#include <asm/suspend.h>
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#include <asm/fncpy.h>
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#include "core.h"
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/* Pointer to function copied to ocram */
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static u32 (*socfpga_sdram_self_refresh_in_ocram)(u32 sdr_base);
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static int socfpga_setup_ocram_self_refresh(void)
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{
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struct platform_device *pdev;
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phys_addr_t ocram_pbase;
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struct device_node *np;
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struct gen_pool *ocram_pool;
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unsigned long ocram_base;
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void __iomem *suspend_ocram_base;
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int ret = 0;
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np = of_find_compatible_node(NULL, NULL, "mmio-sram");
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if (!np) {
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pr_err("%s: Unable to find mmio-sram in dtb\n", __func__);
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return -ENODEV;
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}
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pdev = of_find_device_by_node(np);
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if (!pdev) {
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pr_warn("%s: failed to find ocram device!\n", __func__);
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ret = -ENODEV;
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goto put_node;
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}
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ocram_pool = gen_pool_get(&pdev->dev, NULL);
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if (!ocram_pool) {
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pr_warn("%s: ocram pool unavailable!\n", __func__);
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ret = -ENODEV;
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goto put_node;
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}
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ocram_base = gen_pool_alloc(ocram_pool, socfpga_sdram_self_refresh_sz);
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if (!ocram_base) {
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pr_warn("%s: unable to alloc ocram!\n", __func__);
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ret = -ENOMEM;
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goto put_node;
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}
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ocram_pbase = gen_pool_virt_to_phys(ocram_pool, ocram_base);
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suspend_ocram_base = __arm_ioremap_exec(ocram_pbase,
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socfpga_sdram_self_refresh_sz,
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false);
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if (!suspend_ocram_base) {
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pr_warn("%s: __arm_ioremap_exec failed!\n", __func__);
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ret = -ENOMEM;
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goto put_node;
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}
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/* Copy the code that puts DDR in self refresh to ocram */
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socfpga_sdram_self_refresh_in_ocram =
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(void *)fncpy(suspend_ocram_base,
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&socfpga_sdram_self_refresh,
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socfpga_sdram_self_refresh_sz);
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WARN(!socfpga_sdram_self_refresh_in_ocram,
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"could not copy function to ocram");
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if (!socfpga_sdram_self_refresh_in_ocram)
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ret = -EFAULT;
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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 socfpga_pm_suspend(unsigned long arg)
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{
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u32 ret;
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if (!sdr_ctl_base_addr)
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return -EFAULT;
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ret = socfpga_sdram_self_refresh_in_ocram((u32)sdr_ctl_base_addr);
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pr_debug("%s self-refresh loops request=%d exit=%d\n", __func__,
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ret & 0xffff, (ret >> 16) & 0xffff);
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return 0;
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}
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static int socfpga_pm_enter(suspend_state_t state)
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{
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switch (state) {
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case PM_SUSPEND_MEM:
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outer_disable();
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cpu_suspend(0, socfpga_pm_suspend);
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outer_resume();
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static const struct platform_suspend_ops socfpga_pm_ops = {
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.valid = suspend_valid_only_mem,
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.enter = socfpga_pm_enter,
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};
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static int __init socfpga_pm_init(void)
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{
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int ret;
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ret = socfpga_setup_ocram_self_refresh();
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if (ret)
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return ret;
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suspend_set_ops(&socfpga_pm_ops);
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pr_info("SoCFPGA initialized for DDR self-refresh during suspend.\n");
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return 0;
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}
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arch_initcall(socfpga_pm_init);
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