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![Claudiu Beznea](/assets/img/avatar_default.png)
Add SAMA7G5 to the list of available PMCs such that the suspend/resume code for clocks to be used on backup mode. Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> Link: https://lore.kernel.org/r/20211011112719.3951784-7-claudiu.beznea@microchip.com Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
193 lines
3.9 KiB
C
193 lines
3.9 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/of_address.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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/* Address in SECURAM that say if we suspend to backup mode. */
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static void __iomem *at91_pmc_backup_suspend;
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static int at91_pmc_suspend(void)
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{
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unsigned int backup;
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if (!at91_pmc_backup_suspend)
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return 0;
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backup = readl_relaxed(at91_pmc_backup_suspend);
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if (!backup)
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return 0;
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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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unsigned int backup;
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if (!at91_pmc_backup_suspend)
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return;
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backup = readl_relaxed(at91_pmc_backup_suspend);
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if (!backup)
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return;
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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 pmc_dt_ids[] = {
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{ .compatible = "atmel,sama5d2-pmc" },
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{ .compatible = "microchip,sama7g5-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, 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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np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
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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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at91_pmc_backup_suspend = of_iomap(np, 0);
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if (!at91_pmc_backup_suspend) {
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pr_warn("%s(): unable to map securam\n", __func__);
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return -ENOMEM;
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}
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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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