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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/clk/at91_pmc.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/mfd/syscon.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/syscore_ops.h>
#include <asm/proc-fns.h>
#include "pmc.h"
#define PMC_MAX_IDS 128
#define PMC_MAX_PCKS 8
int of_at91_get_clk_range(struct device_node *np, const char *propname,
struct clk_range *range)
{
u32 min, max;
int ret;
ret = of_property_read_u32_index(np, propname, 0, &min);
if (ret)
return ret;
ret = of_property_read_u32_index(np, propname, 1, &max);
if (ret)
return ret;
if (range) {
range->min = min;
range->max = max;
}
return 0;
}
EXPORT_SYMBOL_GPL(of_at91_get_clk_range);
struct clk_hw *of_clk_hw_pmc_get(struct of_phandle_args *clkspec, void *data)
{
unsigned int type = clkspec->args[0];
unsigned int idx = clkspec->args[1];
struct pmc_data *pmc_data = data;
switch (type) {
case PMC_TYPE_CORE:
if (idx < pmc_data->ncore)
return pmc_data->chws[idx];
break;
case PMC_TYPE_SYSTEM:
if (idx < pmc_data->nsystem)
return pmc_data->shws[idx];
break;
case PMC_TYPE_PERIPHERAL:
if (idx < pmc_data->nperiph)
return pmc_data->phws[idx];
break;
case PMC_TYPE_GCK:
if (idx < pmc_data->ngck)
return pmc_data->ghws[idx];
break;
case PMC_TYPE_PROGRAMMABLE:
if (idx < pmc_data->npck)
return pmc_data->pchws[idx];
break;
default:
break;
}
pr_err("%s: invalid type (%u) or index (%u)\n", __func__, type, idx);
return ERR_PTR(-EINVAL);
}
struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
unsigned int nperiph, unsigned int ngck,
unsigned int npck)
{
unsigned int num_clks = ncore + nsystem + nperiph + ngck + npck;
struct pmc_data *pmc_data;
pmc_data = kzalloc(struct_size(pmc_data, hwtable, num_clks),
GFP_KERNEL);
if (!pmc_data)
return NULL;
pmc_data->ncore = ncore;
pmc_data->chws = pmc_data->hwtable;
pmc_data->nsystem = nsystem;
pmc_data->shws = pmc_data->chws + ncore;
pmc_data->nperiph = nperiph;
pmc_data->phws = pmc_data->shws + nsystem;
pmc_data->ngck = ngck;
pmc_data->ghws = pmc_data->phws + nperiph;
pmc_data->npck = npck;
pmc_data->pchws = pmc_data->ghws + ngck;
return pmc_data;
}
#ifdef CONFIG_PM
/* Address in SECURAM that say if we suspend to backup mode. */
static void __iomem *at91_pmc_backup_suspend;
static int at91_pmc_suspend(void)
{
unsigned int backup;
if (!at91_pmc_backup_suspend)
return 0;
backup = readl_relaxed(at91_pmc_backup_suspend);
if (!backup)
return 0;
return clk_save_context();
}
static void at91_pmc_resume(void)
{
unsigned int backup;
if (!at91_pmc_backup_suspend)
return;
backup = readl_relaxed(at91_pmc_backup_suspend);
if (!backup)
return;
clk_restore_context();
}
static struct syscore_ops pmc_syscore_ops = {
.suspend = at91_pmc_suspend,
.resume = at91_pmc_resume,
};
static const struct of_device_id pmc_dt_ids[] = {
{ .compatible = "atmel,sama5d2-pmc" },
{ .compatible = "microchip,sama7g5-pmc", },
{ .compatible = "microchip,sama7d65-pmc", },
{ /* sentinel */ }
};
static int __init pmc_register_ops(void)
{
struct device_node *np;
np = of_find_matching_node(NULL, pmc_dt_ids);
if (!np)
return -ENODEV;
if (!of_device_is_available(np)) {
of_node_put(np);
return -ENODEV;
}
of_node_put(np);
np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
if (!np)
return -ENODEV;
if (!of_device_is_available(np)) {
of_node_put(np);
return -ENODEV;
}
of_node_put(np);
at91_pmc_backup_suspend = of_iomap(np, 0);
if (!at91_pmc_backup_suspend) {
pr_warn("%s(): unable to map securam\n", __func__);
return -ENOMEM;
}
register_syscore_ops(&pmc_syscore_ops);
return 0;
}
/* This has to happen before arch_initcall because of the tcb_clksrc driver */
postcore_initcall(pmc_register_ops);
#endif
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