drivers/clk/at91/pmc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
   4  */
   5
   6 #include <linux/clk.h>
   7 #include <linux/clk-provider.h>
   8 #include <linux/clkdev.h>
   9 #include <linux/clk/at91_pmc.h>
  10 #include <linux/of.h>
  11 #include <linux/of_address.h>
  12 #include <linux/mfd/syscon.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/regmap.h>
  15 #include <linux/syscore_ops.h>
  16
  17 #include <asm/proc-fns.h>
  18
  19 #include "pmc.h"
  20
  21 #define PMC_MAX_IDS 128
  22 #define PMC_MAX_PCKS 8
  23
  24 int of_at91_get_clk_range(struct device_node *np, const char *propname,
  25                           struct clk_range *range)
  26 {
  27         u32 min, max;
  28         int ret;
  29
  30         ret = of_property_read_u32_index(np, propname, 0, &min);
  31         if (ret)
  32                 return ret;
  33
  34         ret = of_property_read_u32_index(np, propname, 1, &max);
  35         if (ret)
  36                 return ret;
  37
  38         if (range) {
  39                 range->min = min;
  40                 range->max = max;
  41         }
  42
  43         return 0;
  44 }
  45 EXPORT_SYMBOL_GPL(of_at91_get_clk_range);
  46
  47 struct clk_hw *of_clk_hw_pmc_get(struct of_phandle_args *clkspec, void *data)
  48 {
  49         unsigned int type = clkspec->args[0];
  50         unsigned int idx = clkspec->args[1];
  51         struct pmc_data *pmc_data = data;
  52
  53         switch (type) {
  54         case PMC_TYPE_CORE:
  55                 if (idx < pmc_data->ncore)
  56                         return pmc_data->chws[idx];
  57                 break;
  58         case PMC_TYPE_SYSTEM:
  59                 if (idx < pmc_data->nsystem)
  60                         return pmc_data->shws[idx];
  61                 break;
  62         case PMC_TYPE_PERIPHERAL:
  63                 if (idx < pmc_data->nperiph)
  64                         return pmc_data->phws[idx];
  65                 break;
  66         case PMC_TYPE_GCK:
  67                 if (idx < pmc_data->ngck)
  68                         return pmc_data->ghws[idx];
  69                 break;
  70         case PMC_TYPE_PROGRAMMABLE:
  71                 if (idx < pmc_data->npck)
  72                         return pmc_data->pchws[idx];
  73                 break;
  74         default:
  75                 break;
  76         }
  77
  78         pr_err("%s: invalid type (%u) or index (%u)\n", __func__, type, idx);
  79
  80         return ERR_PTR(-EINVAL);
  81 }
  82
  83 struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
  84                                    unsigned int nperiph, unsigned int ngck,
  85                                    unsigned int npck)
  86 {
  87         unsigned int num_clks = ncore + nsystem + nperiph + ngck + npck;
  88         struct pmc_data *pmc_data;
  89
  90         pmc_data = kzalloc(struct_size(pmc_data, hwtable, num_clks),
  91                            GFP_KERNEL);
  92         if (!pmc_data)
  93                 return NULL;
  94
  95         pmc_data->ncore = ncore;
  96         pmc_data->chws = pmc_data->hwtable;
  97
  98         pmc_data->nsystem = nsystem;
  99         pmc_data->shws = pmc_data->chws + ncore;
 100
 101         pmc_data->nperiph = nperiph;
 102         pmc_data->phws = pmc_data->shws + nsystem;
 103
 104         pmc_data->ngck = ngck;
 105         pmc_data->ghws = pmc_data->phws + nperiph;
 106
 107         pmc_data->npck = npck;
 108         pmc_data->pchws = pmc_data->ghws + ngck;
 109
 110         return pmc_data;
 111 }
 112
 113 #ifdef CONFIG_PM
 114
 115 /* Address in SECURAM that say if we suspend to backup mode. */
 116 static void __iomem *at91_pmc_backup_suspend;
 117
 118 static int at91_pmc_suspend(void)
 119 {
 120         unsigned int backup;
 121
 122         if (!at91_pmc_backup_suspend)
 123                 return 0;
 124
 125         backup = readl_relaxed(at91_pmc_backup_suspend);
 126         if (!backup)
 127                 return 0;
 128
 129         return clk_save_context();
 130 }
 131
 132 static void at91_pmc_resume(void)
 133 {
 134         unsigned int backup;
 135
 136         if (!at91_pmc_backup_suspend)
 137                 return;
 138
 139         backup = readl_relaxed(at91_pmc_backup_suspend);
 140         if (!backup)
 141                 return;
 142
 143         clk_restore_context();
 144 }
 145
 146 static struct syscore_ops pmc_syscore_ops = {
 147         .suspend = at91_pmc_suspend,
 148         .resume = at91_pmc_resume,
 149 };
 150
 151 static const struct of_device_id pmc_dt_ids[] = {
 152         { .compatible = "atmel,sama5d2-pmc" },
 153         { .compatible = "microchip,sama7g5-pmc", },
 154         { /* sentinel */ }
 155 };
 156
 157 static int __init pmc_register_ops(void)
 158 {
 159         struct device_node *np;
 160
 161         np = of_find_matching_node(NULL, pmc_dt_ids);
 162         if (!np)
 163                 return -ENODEV;
 164
 165         if (!of_device_is_available(np)) {
 166                 of_node_put(np);
 167                 return -ENODEV;
 168         }
 169         of_node_put(np);
 170
 171         np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
 172         if (!np)
 173                 return -ENODEV;
 174
 175         if (!of_device_is_available(np)) {
 176                 of_node_put(np);
 177                 return -ENODEV;
 178         }
 179         of_node_put(np);
 180
 181         at91_pmc_backup_suspend = of_iomap(np, 0);
 182         if (!at91_pmc_backup_suspend) {
 183                 pr_warn("%s(): unable to map securam\n", __func__);
 184                 return -ENOMEM;
 185         }
 186
 187         register_syscore_ops(&pmc_syscore_ops);
 188
 189         return 0;
 190 }
 191 /* This has to happen before arch_initcall because of the tcb_clksrc driver */
 192 postcore_initcall(pmc_register_ops);
 193 #endif