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 struct at91_pmc_caps {
  24         u32 available_irqs;
  25 };
  26
  27 struct at91_pmc {
  28         struct regmap *regmap;
  29         const struct at91_pmc_caps *caps;
  30 };
  31
  32 void __iomem *at91_pmc_base;
  33 EXPORT_SYMBOL_GPL(at91_pmc_base);
  34
  35 void at91rm9200_idle(void)
  36 {
  37         /*
  38          * Disable the processor clock.  The processor will be automatically
  39          * re-enabled by an interrupt or by a reset.
  40          */
  41         at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
  42 }
  43
  44 void at91sam9_idle(void)
  45 {
  46         at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
  47         cpu_do_idle();
  48 }
  49
  50 int of_at91_get_clk_range(struct device_node *np, const char *propname,
  51                           struct clk_range *range)
  52 {
  53         u32 min, max;
  54         int ret;
  55
  56         ret = of_property_read_u32_index(np, propname, 0, &min);
  57         if (ret)
  58                 return ret;
  59
  60         ret = of_property_read_u32_index(np, propname, 1, &max);
  61         if (ret)
  62                 return ret;
  63
  64         if (range) {
  65                 range->min = min;
  66                 range->max = max;
  67         }
  68
  69         return 0;
  70 }
  71 EXPORT_SYMBOL_GPL(of_at91_get_clk_range);
  72
  73 static const struct at91_pmc_caps at91rm9200_caps = {
  74         .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
  75                           AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
  76                           AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY |
  77                           AT91_PMC_PCK3RDY,
  78 };
  79
  80 static const struct at91_pmc_caps at91sam9260_caps = {
  81         .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
  82                           AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
  83                           AT91_PMC_PCK1RDY,
  84 };
  85
  86 static const struct at91_pmc_caps at91sam9g45_caps = {
  87         .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
  88                           AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
  89                           AT91_PMC_PCK1RDY,
  90 };
  91
  92 static const struct at91_pmc_caps at91sam9n12_caps = {
  93         .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
  94                           AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
  95                           AT91_PMC_PCK1RDY | AT91_PMC_MOSCSELS |
  96                           AT91_PMC_MOSCRCS | AT91_PMC_CFDEV,
  97 };
  98
  99 static const struct at91_pmc_caps at91sam9x5_caps = {
 100         .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
 101                           AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
 102                           AT91_PMC_PCK1RDY | AT91_PMC_MOSCSELS |
 103                           AT91_PMC_MOSCRCS | AT91_PMC_CFDEV,
 104 };
 105
 106 static const struct at91_pmc_caps sama5d2_caps = {
 107         .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
 108                           AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
 109                           AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY |
 110                           AT91_PMC_MOSCSELS | AT91_PMC_MOSCRCS |
 111                           AT91_PMC_CFDEV | AT91_PMC_GCKRDY,
 112 };
 113
 114 static const struct at91_pmc_caps sama5d3_caps = {
 115         .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
 116                           AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
 117                           AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY |
 118                           AT91_PMC_MOSCSELS | AT91_PMC_MOSCRCS |
 119                           AT91_PMC_CFDEV,
 120 };
 121
 122 static void __init of_at91_pmc_setup(struct device_node *np,
 123                                      const struct at91_pmc_caps *caps)
 124 {
 125         struct at91_pmc *pmc;
 126         void __iomem *regbase = of_iomap(np, 0);
 127         struct regmap *regmap;
 128
 129         at91_pmc_base = regbase;
 130
 131         regmap = syscon_node_to_regmap(np);
 132         if (IS_ERR(regmap))
 133                 panic("Could not retrieve syscon regmap");
 134
 135         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
 136         if (!pmc)
 137                 return;
 138
 139         pmc->regmap = regmap;
 140         pmc->caps = caps;
 141
 142         regmap_write(pmc->regmap, AT91_PMC_IDR, 0xffffffff);
 143
 144 }
 145
 146 static void __init of_at91rm9200_pmc_setup(struct device_node *np)
 147 {
 148         of_at91_pmc_setup(np, &at91rm9200_caps);
 149 }
 150 CLK_OF_DECLARE(at91rm9200_clk_pmc, "atmel,at91rm9200-pmc",
 151                of_at91rm9200_pmc_setup);
 152
 153 static void __init of_at91sam9260_pmc_setup(struct device_node *np)
 154 {
 155         of_at91_pmc_setup(np, &at91sam9260_caps);
 156 }
 157 CLK_OF_DECLARE(at91sam9260_clk_pmc, "atmel,at91sam9260-pmc",
 158                of_at91sam9260_pmc_setup);
 159
 160 static void __init of_at91sam9g45_pmc_setup(struct device_node *np)
 161 {
 162         of_at91_pmc_setup(np, &at91sam9g45_caps);
 163 }
 164 CLK_OF_DECLARE(at91sam9g45_clk_pmc, "atmel,at91sam9g45-pmc",
 165                of_at91sam9g45_pmc_setup);
 166
 167 static void __init of_at91sam9n12_pmc_setup(struct device_node *np)
 168 {
 169         of_at91_pmc_setup(np, &at91sam9n12_caps);
 170 }
 171 CLK_OF_DECLARE(at91sam9n12_clk_pmc, "atmel,at91sam9n12-pmc",
 172                of_at91sam9n12_pmc_setup);
 173
 174 static void __init of_at91sam9x5_pmc_setup(struct device_node *np)
 175 {
 176         of_at91_pmc_setup(np, &at91sam9x5_caps);
 177 }
 178 CLK_OF_DECLARE(at91sam9x5_clk_pmc, "atmel,at91sam9x5-pmc",
 179                of_at91sam9x5_pmc_setup);
 180
 181 static void __init of_sama5d2_pmc_setup(struct device_node *np)
 182 {
 183         of_at91_pmc_setup(np, &sama5d2_caps);
 184 }
 185 CLK_OF_DECLARE(sama5d2_clk_pmc, "atmel,sama5d2-pmc",
 186                of_sama5d2_pmc_setup);
 187
 188 static void __init of_sama5d3_pmc_setup(struct device_node *np)
 189 {
 190         of_at91_pmc_setup(np, &sama5d3_caps);
 191 }
 192 CLK_OF_DECLARE(sama5d3_clk_pmc, "atmel,sama5d3-pmc",
 193                of_sama5d3_pmc_setup);