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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
- */
- #include <linux/clk-provider.h>
- #include <linux/clkdev.h>
- #include <linux/clk/at91_pmc.h>
- #include <linux/of.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 <dt-bindings/clock/at91.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
- static struct regmap *pmcreg;
- static u8 registered_ids[PMC_MAX_IDS];
- static u8 registered_pcks[PMC_MAX_PCKS];
- static struct
- {
- u32 scsr;
- u32 pcsr0;
- u32 uckr;
- u32 mor;
- u32 mcfr;
- u32 pllar;
- u32 mckr;
- u32 usb;
- u32 imr;
- u32 pcsr1;
- u32 pcr[PMC_MAX_IDS];
- u32 audio_pll0;
- u32 audio_pll1;
- u32 pckr[PMC_MAX_PCKS];
- } pmc_cache;
- /*
- * As Peripheral ID 0 is invalid on AT91 chips, the identifier is stored
- * without alteration in the table, and 0 is for unused clocks.
- */
- void pmc_register_id(u8 id)
- {
- int i;
- for (i = 0; i < PMC_MAX_IDS; i++) {
- if (registered_ids[i] == 0) {
- registered_ids[i] = id;
- break;
- }
- if (registered_ids[i] == id)
- break;
- }
- }
- /*
- * As Programmable Clock 0 is valid on AT91 chips, there is an offset
- * of 1 between the stored value and the real clock ID.
- */
- void pmc_register_pck(u8 pck)
- {
- int i;
- for (i = 0; i < PMC_MAX_PCKS; i++) {
- if (registered_pcks[i] == 0) {
- registered_pcks[i] = pck + 1;
- break;
- }
- if (registered_pcks[i] == (pck + 1))
- break;
- }
- }
- static int pmc_suspend(void)
- {
- int i;
- u8 num;
- regmap_read(pmcreg, AT91_PMC_SCSR, &pmc_cache.scsr);
- regmap_read(pmcreg, AT91_PMC_PCSR, &pmc_cache.pcsr0);
- regmap_read(pmcreg, AT91_CKGR_UCKR, &pmc_cache.uckr);
- regmap_read(pmcreg, AT91_CKGR_MOR, &pmc_cache.mor);
- regmap_read(pmcreg, AT91_CKGR_MCFR, &pmc_cache.mcfr);
- regmap_read(pmcreg, AT91_CKGR_PLLAR, &pmc_cache.pllar);
- regmap_read(pmcreg, AT91_PMC_MCKR, &pmc_cache.mckr);
- regmap_read(pmcreg, AT91_PMC_USB, &pmc_cache.usb);
- regmap_read(pmcreg, AT91_PMC_IMR, &pmc_cache.imr);
- regmap_read(pmcreg, AT91_PMC_PCSR1, &pmc_cache.pcsr1);
- for (i = 0; registered_ids[i]; i++) {
- regmap_write(pmcreg, AT91_PMC_PCR,
- (registered_ids[i] & AT91_PMC_PCR_PID_MASK));
- regmap_read(pmcreg, AT91_PMC_PCR,
- &pmc_cache.pcr[registered_ids[i]]);
- }
- for (i = 0; registered_pcks[i]; i++) {
- num = registered_pcks[i] - 1;
- regmap_read(pmcreg, AT91_PMC_PCKR(num), &pmc_cache.pckr[num]);
- }
- return 0;
- }
- static bool pmc_ready(unsigned int mask)
- {
- unsigned int status;
- regmap_read(pmcreg, AT91_PMC_SR, &status);
- return ((status & mask) == mask) ? 1 : 0;
- }
- static void pmc_resume(void)
- {
- int i;
- u8 num;
- u32 tmp;
- u32 mask = AT91_PMC_MCKRDY | AT91_PMC_LOCKA;
- regmap_read(pmcreg, AT91_PMC_MCKR, &tmp);
- if (pmc_cache.mckr != tmp)
- pr_warn("MCKR was not configured properly by the firmware\n");
- regmap_read(pmcreg, AT91_CKGR_PLLAR, &tmp);
- if (pmc_cache.pllar != tmp)
- pr_warn("PLLAR was not configured properly by the firmware\n");
- regmap_write(pmcreg, AT91_PMC_SCER, pmc_cache.scsr);
- regmap_write(pmcreg, AT91_PMC_PCER, pmc_cache.pcsr0);
- regmap_write(pmcreg, AT91_CKGR_UCKR, pmc_cache.uckr);
- regmap_write(pmcreg, AT91_CKGR_MOR, pmc_cache.mor);
- regmap_write(pmcreg, AT91_CKGR_MCFR, pmc_cache.mcfr);
- regmap_write(pmcreg, AT91_PMC_USB, pmc_cache.usb);
- regmap_write(pmcreg, AT91_PMC_IMR, pmc_cache.imr);
- regmap_write(pmcreg, AT91_PMC_PCER1, pmc_cache.pcsr1);
- for (i = 0; registered_ids[i]; i++) {
- regmap_write(pmcreg, AT91_PMC_PCR,
- pmc_cache.pcr[registered_ids[i]] |
- AT91_PMC_PCR_CMD);
- }
- for (i = 0; registered_pcks[i]; i++) {
- num = registered_pcks[i] - 1;
- regmap_write(pmcreg, AT91_PMC_PCKR(num), pmc_cache.pckr[num]);
- }
- if (pmc_cache.uckr & AT91_PMC_UPLLEN)
- mask |= AT91_PMC_LOCKU;
- while (!pmc_ready(mask))
- cpu_relax();
- }
- static struct syscore_ops pmc_syscore_ops = {
- .suspend = pmc_suspend,
- .resume = pmc_resume,
- };
- static const struct of_device_id sama5d2_pmc_dt_ids[] = {
- { .compatible = "atmel,sama5d2-pmc" },
- { /* sentinel */ }
- };
- static int __init pmc_register_ops(void)
- {
- struct device_node *np;
- np = of_find_matching_node(NULL, sama5d2_pmc_dt_ids);
- if (!np)
- return -ENODEV;
- if (!of_device_is_available(np)) {
- of_node_put(np);
- return -ENODEV;
- }
- pmcreg = device_node_to_regmap(np);
- of_node_put(np);
- if (IS_ERR(pmcreg))
- return PTR_ERR(pmcreg);
- 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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