drivers/clk/at91/at91sam9rl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/clk-provider.h>
   3 #include <linux/mfd/syscon.h>
   4 #include <linux/slab.h>
   5
   6 #include <dt-bindings/clock/at91.h>
   7
   8 #include "pmc.h"
   9
  10 static const struct clk_master_characteristics sam9rl_mck_characteristics = {
  11         .output = { .min = 0, .max = 94000000 },
  12         .divisors = { 1, 2, 4, 0 },
  13 };
  14
  15 static u8 sam9rl_plla_out[] = { 0, 2 };
  16
  17 static const struct clk_range sam9rl_plla_outputs[] = {
  18         { .min = 80000000, .max = 200000000 },
  19         { .min = 190000000, .max = 240000000 },
  20 };
  21
  22 static const struct clk_pll_characteristics sam9rl_plla_characteristics = {
  23         .input = { .min = 1000000, .max = 32000000 },
  24         .num_output = ARRAY_SIZE(sam9rl_plla_outputs),
  25         .output = sam9rl_plla_outputs,
  26         .out = sam9rl_plla_out,
  27 };
  28
  29 static const struct {
  30         char *n;
  31         char *p;
  32         u8 id;
  33 } at91sam9rl_systemck[] = {
  34         { .n = "pck0",  .p = "prog0",    .id = 8 },
  35         { .n = "pck1",  .p = "prog1",    .id = 9 },
  36 };
  37
  38 static const struct {
  39         char *n;
  40         u8 id;
  41 } at91sam9rl_periphck[] = {
  42         { .n = "pioA_clk",   .id = 2, },
  43         { .n = "pioB_clk",   .id = 3, },
  44         { .n = "pioC_clk",   .id = 4, },
  45         { .n = "pioD_clk",   .id = 5, },
  46         { .n = "usart0_clk", .id = 6, },
  47         { .n = "usart1_clk", .id = 7, },
  48         { .n = "usart2_clk", .id = 8, },
  49         { .n = "usart3_clk", .id = 9, },
  50         { .n = "mci0_clk",   .id = 10, },
  51         { .n = "twi0_clk",   .id = 11, },
  52         { .n = "twi1_clk",   .id = 12, },
  53         { .n = "spi0_clk",   .id = 13, },
  54         { .n = "ssc0_clk",   .id = 14, },
  55         { .n = "ssc1_clk",   .id = 15, },
  56         { .n = "tc0_clk",    .id = 16, },
  57         { .n = "tc1_clk",    .id = 17, },
  58         { .n = "tc2_clk",    .id = 18, },
  59         { .n = "pwm_clk",    .id = 19, },
  60         { .n = "adc_clk",    .id = 20, },
  61         { .n = "dma0_clk",   .id = 21, },
  62         { .n = "udphs_clk",  .id = 22, },
  63         { .n = "lcd_clk",    .id = 23, },
  64 };
  65
  66 static void __init at91sam9rl_pmc_setup(struct device_node *np)
  67 {
  68         const char *slck_name, *mainxtal_name;
  69         struct pmc_data *at91sam9rl_pmc;
  70         const char *parent_names[6];
  71         struct regmap *regmap;
  72         struct clk_hw *hw;
  73         int i;
  74
  75         i = of_property_match_string(np, "clock-names", "slow_clk");
  76         if (i < 0)
  77                 return;
  78
  79         slck_name = of_clk_get_parent_name(np, i);
  80
  81         i = of_property_match_string(np, "clock-names", "main_xtal");
  82         if (i < 0)
  83                 return;
  84         mainxtal_name = of_clk_get_parent_name(np, i);
  85
  86         regmap = syscon_node_to_regmap(np);
  87         if (IS_ERR(regmap))
  88                 return;
  89
  90         at91sam9rl_pmc = pmc_data_allocate(PMC_MAIN + 1,
  91                                            nck(at91sam9rl_systemck),
  92                                            nck(at91sam9rl_periphck), 0);
  93         if (!at91sam9rl_pmc)
  94                 return;
  95
  96         hw = at91_clk_register_rm9200_main(regmap, "mainck", mainxtal_name);
  97         if (IS_ERR(hw))
  98                 goto err_free;
  99
 100         at91sam9rl_pmc->chws[PMC_MAIN] = hw;
 101
 102         hw = at91_clk_register_pll(regmap, "pllack", "mainck", 0,
 103                                    &at91rm9200_pll_layout,
 104                                    &sam9rl_plla_characteristics);
 105         if (IS_ERR(hw))
 106                 goto err_free;
 107
 108         hw = at91_clk_register_utmi(regmap, NULL, "utmick", "mainck");
 109         if (IS_ERR(hw))
 110                 goto err_free;
 111
 112         at91sam9rl_pmc->chws[PMC_UTMI] = hw;
 113
 114         parent_names[0] = slck_name;
 115         parent_names[1] = "mainck";
 116         parent_names[2] = "pllack";
 117         parent_names[3] = "utmick";
 118         hw = at91_clk_register_master(regmap, "masterck", 4, parent_names,
 119                                       &at91rm9200_master_layout,
 120                                       &sam9rl_mck_characteristics);
 121         if (IS_ERR(hw))
 122                 goto err_free;
 123
 124         at91sam9rl_pmc->chws[PMC_MCK] = hw;
 125
 126         parent_names[0] = slck_name;
 127         parent_names[1] = "mainck";
 128         parent_names[2] = "pllack";
 129         parent_names[3] = "utmick";
 130         parent_names[4] = "masterck";
 131         for (i = 0; i < 2; i++) {
 132                 char name[6];
 133
 134                 snprintf(name, sizeof(name), "prog%d", i);
 135
 136                 hw = at91_clk_register_programmable(regmap, name,
 137                                                     parent_names, 5, i,
 138                                                     &at91rm9200_programmable_layout);
 139                 if (IS_ERR(hw))
 140                         goto err_free;
 141         }
 142
 143         for (i = 0; i < ARRAY_SIZE(at91sam9rl_systemck); i++) {
 144                 hw = at91_clk_register_system(regmap, at91sam9rl_systemck[i].n,
 145                                               at91sam9rl_systemck[i].p,
 146                                               at91sam9rl_systemck[i].id);
 147                 if (IS_ERR(hw))
 148                         goto err_free;
 149
 150                 at91sam9rl_pmc->shws[at91sam9rl_systemck[i].id] = hw;
 151         }
 152
 153         for (i = 0; i < ARRAY_SIZE(at91sam9rl_periphck); i++) {
 154                 hw = at91_clk_register_peripheral(regmap,
 155                                                   at91sam9rl_periphck[i].n,
 156                                                   "masterck",
 157                                                   at91sam9rl_periphck[i].id);
 158                 if (IS_ERR(hw))
 159                         goto err_free;
 160
 161                 at91sam9rl_pmc->phws[at91sam9rl_periphck[i].id] = hw;
 162         }
 163
 164         of_clk_add_hw_provider(np, of_clk_hw_pmc_get, at91sam9rl_pmc);
 165
 166         return;
 167
 168 err_free:
 169         pmc_data_free(at91sam9rl_pmc);
 170 }
 171 CLK_OF_DECLARE_DRIVER(at91sam9rl_pmc, "atmel,at91sam9rl-pmc", at91sam9rl_pmc_setup);