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SAMA5D2 and SAMA7G5 have a special power saving mode (backup mode) where most of the SoC's components are powered off (including PMC). Resuming from this mode is done with the help of bootloader. Peripherals are not aware of the power saving mode thus most of them are disabling clocks in proper suspend API and re-enable them in resume API without taking into account the previously setup rate. Moreover some of the peripherals are acting as wakeup sources and are not disabling the clocks in this scenario, when suspending. Since backup mode cuts the power for peripherals, in resume part these clocks needs to be re-configured. The initial PMC suspend/resume code was designed only for SAMA5D2's PMC (as it was the only one supporting backup mode). SAMA7G supports also backup mode and its PMC is different (few new functionalities, different registers offsets, different offsets in registers for each functionalities). To address both SAMA5D2 and SAMA7G5 PMC add .save_context()/.resume_context() support to each clocks driver and call this from PMC driver. Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> Link: https://lore.kernel.org/r/20211011112719.3951784-2-claudiu.beznea@microchip.com Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
154 lines
3.1 KiB
C
154 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
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*/
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/clk/at91_pmc.h>
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#include <linux/of.h>
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#include <linux/mfd/syscon.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/syscore_ops.h>
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#include <asm/proc-fns.h>
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#include "pmc.h"
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#define PMC_MAX_IDS 128
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#define PMC_MAX_PCKS 8
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int of_at91_get_clk_range(struct device_node *np, const char *propname,
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struct clk_range *range)
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{
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u32 min, max;
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int ret;
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ret = of_property_read_u32_index(np, propname, 0, &min);
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if (ret)
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return ret;
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ret = of_property_read_u32_index(np, propname, 1, &max);
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if (ret)
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return ret;
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if (range) {
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range->min = min;
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range->max = max;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_at91_get_clk_range);
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struct clk_hw *of_clk_hw_pmc_get(struct of_phandle_args *clkspec, void *data)
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{
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unsigned int type = clkspec->args[0];
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unsigned int idx = clkspec->args[1];
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struct pmc_data *pmc_data = data;
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switch (type) {
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case PMC_TYPE_CORE:
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if (idx < pmc_data->ncore)
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return pmc_data->chws[idx];
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break;
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case PMC_TYPE_SYSTEM:
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if (idx < pmc_data->nsystem)
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return pmc_data->shws[idx];
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break;
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case PMC_TYPE_PERIPHERAL:
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if (idx < pmc_data->nperiph)
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return pmc_data->phws[idx];
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break;
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case PMC_TYPE_GCK:
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if (idx < pmc_data->ngck)
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return pmc_data->ghws[idx];
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break;
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case PMC_TYPE_PROGRAMMABLE:
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if (idx < pmc_data->npck)
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return pmc_data->pchws[idx];
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break;
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default:
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break;
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}
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pr_err("%s: invalid type (%u) or index (%u)\n", __func__, type, idx);
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return ERR_PTR(-EINVAL);
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}
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struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
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unsigned int nperiph, unsigned int ngck,
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unsigned int npck)
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{
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unsigned int num_clks = ncore + nsystem + nperiph + ngck + npck;
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struct pmc_data *pmc_data;
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pmc_data = kzalloc(struct_size(pmc_data, hwtable, num_clks),
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GFP_KERNEL);
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if (!pmc_data)
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return NULL;
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pmc_data->ncore = ncore;
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pmc_data->chws = pmc_data->hwtable;
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pmc_data->nsystem = nsystem;
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pmc_data->shws = pmc_data->chws + ncore;
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pmc_data->nperiph = nperiph;
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pmc_data->phws = pmc_data->shws + nsystem;
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pmc_data->ngck = ngck;
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pmc_data->ghws = pmc_data->phws + nperiph;
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pmc_data->npck = npck;
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pmc_data->pchws = pmc_data->ghws + ngck;
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return pmc_data;
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}
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#ifdef CONFIG_PM
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static int at91_pmc_suspend(void)
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{
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return clk_save_context();
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}
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static void at91_pmc_resume(void)
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{
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clk_restore_context();
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}
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static struct syscore_ops pmc_syscore_ops = {
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.suspend = at91_pmc_suspend,
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.resume = at91_pmc_resume,
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};
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static const struct of_device_id sama5d2_pmc_dt_ids[] = {
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{ .compatible = "atmel,sama5d2-pmc" },
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{ /* sentinel */ }
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};
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static int __init pmc_register_ops(void)
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{
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struct device_node *np;
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np = of_find_matching_node(NULL, sama5d2_pmc_dt_ids);
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if (!np)
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return -ENODEV;
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if (!of_device_is_available(np)) {
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of_node_put(np);
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return -ENODEV;
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}
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of_node_put(np);
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register_syscore_ops(&pmc_syscore_ops);
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return 0;
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}
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/* This has to happen before arch_initcall because of the tcb_clksrc driver */
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postcore_initcall(pmc_register_ops);
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#endif
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