drivers/clk/at91/pmc.c

   1 /*
   2  *  Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  */
  10
  11 #include <linux/clk-provider.h>
  12 #include <linux/clkdev.h>
  13 #include <linux/clk/at91_pmc.h>
  14 #include <linux/of.h>
  15 #include <linux/of_address.h>
  16 #include <linux/mfd/syscon.h>
  17 #include <linux/regmap.h>
  18
  19 #include <asm/proc-fns.h>
  20
  21 #include "pmc.h"
  22
  23 void __iomem *at91_pmc_base;
  24 EXPORT_SYMBOL_GPL(at91_pmc_base);
  25
  26 void at91rm9200_idle(void)
  27 {
  28         /*
  29          * Disable the processor clock.  The processor will be automatically
  30          * re-enabled by an interrupt or by a reset.
  31          */
  32         at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
  33 }
  34
  35 void at91sam9_idle(void)
  36 {
  37         at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
  38         cpu_do_idle();
  39 }
  40
  41 int of_at91_get_clk_range(struct device_node *np, const char *propname,
  42                           struct clk_range *range)
  43 {
  44         u32 min, max;
  45         int ret;
  46
  47         ret = of_property_read_u32_index(np, propname, 0, &min);
  48         if (ret)
  49                 return ret;
  50
  51         ret = of_property_read_u32_index(np, propname, 1, &max);
  52         if (ret)
  53                 return ret;
  54
  55         if (range) {
  56                 range->min = min;
  57                 range->max = max;
  58         }
  59
  60         return 0;
  61 }
  62 EXPORT_SYMBOL_GPL(of_at91_get_clk_range);
  63
  64 static const struct at91_pmc_caps at91rm9200_caps = {
  65         .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
  66                           AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
  67                           AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY |
  68                           AT91_PMC_PCK3RDY,
  69 };
  70
  71 static const struct at91_pmc_caps at91sam9260_caps = {
  72         .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
  73                           AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
  74                           AT91_PMC_PCK1RDY,
  75 };
  76
  77 static const struct at91_pmc_caps at91sam9g45_caps = {
  78         .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
  79                           AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
  80                           AT91_PMC_PCK1RDY,
  81 };
  82
  83 static const struct at91_pmc_caps at91sam9n12_caps = {
  84         .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
  85                           AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
  86                           AT91_PMC_PCK1RDY | AT91_PMC_MOSCSELS |
  87                           AT91_PMC_MOSCRCS | AT91_PMC_CFDEV,
  88 };
  89
  90 static const struct at91_pmc_caps at91sam9x5_caps = {
  91         .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
  92                           AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
  93                           AT91_PMC_PCK1RDY | AT91_PMC_MOSCSELS |
  94                           AT91_PMC_MOSCRCS | AT91_PMC_CFDEV,
  95 };
  96
  97 static const struct at91_pmc_caps sama5d2_caps = {
  98         .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
  99                           AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
 100                           AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY |
 101                           AT91_PMC_MOSCSELS | AT91_PMC_MOSCRCS |
 102                           AT91_PMC_CFDEV | AT91_PMC_GCKRDY,
 103 };
 104
 105 static const struct at91_pmc_caps sama5d3_caps = {
 106         .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
 107                           AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
 108                           AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY |
 109                           AT91_PMC_MOSCSELS | AT91_PMC_MOSCRCS |
 110                           AT91_PMC_CFDEV,
 111 };
 112
 113 static struct at91_pmc *__init at91_pmc_init(struct device_node *np,
 114                                              struct regmap *regmap,
 115                                              void __iomem *regbase,
 116                                              const struct at91_pmc_caps *caps)
 117 {
 118         struct at91_pmc *pmc;
 119
 120         if (!regbase || !caps)
 121                 return NULL;
 122
 123         at91_pmc_base = regbase;
 124
 125         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
 126         if (!pmc)
 127                 return NULL;
 128
 129         pmc->regmap = regmap;
 130         pmc->caps = caps;
 131
 132         regmap_write(pmc->regmap, AT91_PMC_IDR, 0xffffffff);
 133
 134         return pmc;
 135 }
 136
 137 static void __init of_at91_pmc_setup(struct device_node *np,
 138                                      const struct at91_pmc_caps *caps)
 139 {
 140         struct at91_pmc *pmc;
 141         void __iomem *regbase = of_iomap(np, 0);
 142         struct regmap *regmap;
 143
 144         regmap = syscon_node_to_regmap(np);
 145         if (IS_ERR(regmap))
 146                 panic("Could not retrieve syscon regmap");
 147
 148         pmc = at91_pmc_init(np, regmap, regbase, caps);
 149         if (!pmc)
 150                 return;
 151 }
 152
 153 static void __init of_at91rm9200_pmc_setup(struct device_node *np)
 154 {
 155         of_at91_pmc_setup(np, &at91rm9200_caps);
 156 }
 157 CLK_OF_DECLARE(at91rm9200_clk_pmc, "atmel,at91rm9200-pmc",
 158                of_at91rm9200_pmc_setup);
 159
 160 static void __init of_at91sam9260_pmc_setup(struct device_node *np)
 161 {
 162         of_at91_pmc_setup(np, &at91sam9260_caps);
 163 }
 164 CLK_OF_DECLARE(at91sam9260_clk_pmc, "atmel,at91sam9260-pmc",
 165                of_at91sam9260_pmc_setup);
 166
 167 static void __init of_at91sam9g45_pmc_setup(struct device_node *np)
 168 {
 169         of_at91_pmc_setup(np, &at91sam9g45_caps);
 170 }
 171 CLK_OF_DECLARE(at91sam9g45_clk_pmc, "atmel,at91sam9g45-pmc",
 172                of_at91sam9g45_pmc_setup);
 173
 174 static void __init of_at91sam9n12_pmc_setup(struct device_node *np)
 175 {
 176         of_at91_pmc_setup(np, &at91sam9n12_caps);
 177 }
 178 CLK_OF_DECLARE(at91sam9n12_clk_pmc, "atmel,at91sam9n12-pmc",
 179                of_at91sam9n12_pmc_setup);
 180
 181 static void __init of_at91sam9x5_pmc_setup(struct device_node *np)
 182 {
 183         of_at91_pmc_setup(np, &at91sam9x5_caps);
 184 }
 185 CLK_OF_DECLARE(at91sam9x5_clk_pmc, "atmel,at91sam9x5-pmc",
 186                of_at91sam9x5_pmc_setup);
 187
 188 static void __init of_sama5d2_pmc_setup(struct device_node *np)
 189 {
 190         of_at91_pmc_setup(np, &sama5d2_caps);
 191 }
 192 CLK_OF_DECLARE(sama5d2_clk_pmc, "atmel,sama5d2-pmc",
 193                of_sama5d2_pmc_setup);
 194
 195 static void __init of_sama5d3_pmc_setup(struct device_node *np)
 196 {
 197         of_at91_pmc_setup(np, &sama5d3_caps);
 198 }
 199 CLK_OF_DECLARE(sama5d3_clk_pmc, "atmel,sama5d3-pmc",
 200                of_sama5d3_pmc_setup);