drivers/clk/at91/at91sam9n12.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 DEFINE_SPINLOCK(at91sam9n12_mck_lock);
  11
  12 static const struct clk_master_characteristics mck_characteristics = {
  13         .output = { .min = 0, .max = 133333333 },
  14         .divisors = { 1, 2, 4, 3 },
  15         .have_div3_pres = 1,
  16 };
  17
  18 static u8 plla_out[] = { 0, 1, 2, 3, 0, 1, 2, 3 };
  19
  20 static u16 plla_icpll[] = { 0, 0, 0, 0, 1, 1, 1, 1 };
  21
  22 static const struct clk_range plla_outputs[] = {
  23         { .min = 745000000, .max = 800000000 },
  24         { .min = 695000000, .max = 750000000 },
  25         { .min = 645000000, .max = 700000000 },
  26         { .min = 595000000, .max = 650000000 },
  27         { .min = 545000000, .max = 600000000 },
  28         { .min = 495000000, .max = 555000000 },
  29         { .min = 445000000, .max = 500000000 },
  30         { .min = 400000000, .max = 450000000 },
  31 };
  32
  33 static const struct clk_pll_characteristics plla_characteristics = {
  34         .input = { .min = 2000000, .max = 32000000 },
  35         .num_output = ARRAY_SIZE(plla_outputs),
  36         .output = plla_outputs,
  37         .icpll = plla_icpll,
  38         .out = plla_out,
  39 };
  40
  41 static u8 pllb_out[] = { 0 };
  42
  43 static const struct clk_range pllb_outputs[] = {
  44         { .min = 30000000, .max = 100000000 },
  45 };
  46
  47 static const struct clk_pll_characteristics pllb_characteristics = {
  48         .input = { .min = 2000000, .max = 32000000 },
  49         .num_output = ARRAY_SIZE(pllb_outputs),
  50         .output = pllb_outputs,
  51         .out = pllb_out,
  52 };
  53
  54 static const struct {
  55         char *n;
  56         char *p;
  57         u8 id;
  58 } at91sam9n12_systemck[] = {
  59         { .n = "ddrck", .p = "masterck_div", .id = 2 },
  60         { .n = "lcdck", .p = "masterck_div", .id = 3 },
  61         { .n = "uhpck", .p = "usbck",        .id = 6 },
  62         { .n = "udpck", .p = "usbck",        .id = 7 },
  63         { .n = "pck0",  .p = "prog0",        .id = 8 },
  64         { .n = "pck1",  .p = "prog1",        .id = 9 },
  65 };
  66
  67 static const struct clk_pcr_layout at91sam9n12_pcr_layout = {
  68         .offset = 0x10c,
  69         .cmd = BIT(12),
  70         .pid_mask = GENMASK(5, 0),
  71         .div_mask = GENMASK(17, 16),
  72 };
  73
  74 struct pck {
  75         char *n;
  76         u8 id;
  77 };
  78
  79 static const struct pck at91sam9n12_periphck[] = {
  80         { .n = "pioAB_clk",  .id = 2, },
  81         { .n = "pioCD_clk",  .id = 3, },
  82         { .n = "fuse_clk",   .id = 4, },
  83         { .n = "usart0_clk", .id = 5, },
  84         { .n = "usart1_clk", .id = 6, },
  85         { .n = "usart2_clk", .id = 7, },
  86         { .n = "usart3_clk", .id = 8, },
  87         { .n = "twi0_clk",   .id = 9, },
  88         { .n = "twi1_clk",   .id = 10, },
  89         { .n = "mci0_clk",   .id = 12, },
  90         { .n = "spi0_clk",   .id = 13, },
  91         { .n = "spi1_clk",   .id = 14, },
  92         { .n = "uart0_clk",  .id = 15, },
  93         { .n = "uart1_clk",  .id = 16, },
  94         { .n = "tcb_clk",    .id = 17, },
  95         { .n = "pwm_clk",    .id = 18, },
  96         { .n = "adc_clk",    .id = 19, },
  97         { .n = "dma0_clk",   .id = 20, },
  98         { .n = "uhphs_clk",  .id = 22, },
  99         { .n = "udphs_clk",  .id = 23, },
 100         { .n = "lcdc_clk",   .id = 25, },
 101         { .n = "sha_clk",    .id = 27, },
 102         { .n = "ssc0_clk",   .id = 28, },
 103         { .n = "aes_clk",    .id = 29, },
 104         { .n = "trng_clk",   .id = 30, },
 105 };
 106
 107 static void __init at91sam9n12_pmc_setup(struct device_node *np)
 108 {
 109         struct clk_range range = CLK_RANGE(0, 0);
 110         const char *slck_name, *mainxtal_name;
 111         struct pmc_data *at91sam9n12_pmc;
 112         const char *parent_names[6];
 113         struct regmap *regmap;
 114         struct clk_hw *hw;
 115         int i;
 116         bool bypass;
 117
 118         i = of_property_match_string(np, "clock-names", "slow_clk");
 119         if (i < 0)
 120                 return;
 121
 122         slck_name = of_clk_get_parent_name(np, i);
 123
 124         i = of_property_match_string(np, "clock-names", "main_xtal");
 125         if (i < 0)
 126                 return;
 127         mainxtal_name = of_clk_get_parent_name(np, i);
 128
 129         regmap = device_node_to_regmap(np);
 130         if (IS_ERR(regmap))
 131                 return;
 132
 133         at91sam9n12_pmc = pmc_data_allocate(PMC_PLLBCK + 1,
 134                                            nck(at91sam9n12_systemck), 31, 0, 2);
 135         if (!at91sam9n12_pmc)
 136                 return;
 137
 138         hw = at91_clk_register_main_rc_osc(regmap, "main_rc_osc", 12000000,
 139                                            50000000);
 140         if (IS_ERR(hw))
 141                 goto err_free;
 142
 143         bypass = of_property_read_bool(np, "atmel,osc-bypass");
 144
 145         hw = at91_clk_register_main_osc(regmap, "main_osc", mainxtal_name,
 146                                         bypass);
 147         if (IS_ERR(hw))
 148                 goto err_free;
 149
 150         parent_names[0] = "main_rc_osc";
 151         parent_names[1] = "main_osc";
 152         hw = at91_clk_register_sam9x5_main(regmap, "mainck", parent_names, 2);
 153         if (IS_ERR(hw))
 154                 goto err_free;
 155
 156         at91sam9n12_pmc->chws[PMC_MAIN] = hw;
 157
 158         hw = at91_clk_register_pll(regmap, "pllack", "mainck", 0,
 159                                    &at91rm9200_pll_layout, &plla_characteristics);
 160         if (IS_ERR(hw))
 161                 goto err_free;
 162
 163         hw = at91_clk_register_plldiv(regmap, "plladivck", "pllack");
 164         if (IS_ERR(hw))
 165                 goto err_free;
 166
 167         at91sam9n12_pmc->chws[PMC_PLLACK] = hw;
 168
 169         hw = at91_clk_register_pll(regmap, "pllbck", "mainck", 1,
 170                                    &at91rm9200_pll_layout, &pllb_characteristics);
 171         if (IS_ERR(hw))
 172                 goto err_free;
 173
 174         at91sam9n12_pmc->chws[PMC_PLLBCK] = hw;
 175
 176         parent_names[0] = slck_name;
 177         parent_names[1] = "mainck";
 178         parent_names[2] = "plladivck";
 179         parent_names[3] = "pllbck";
 180         hw = at91_clk_register_master_pres(regmap, "masterck_pres", 4,
 181                                            parent_names,
 182                                            &at91sam9x5_master_layout,
 183                                            &mck_characteristics,
 184                                            &at91sam9n12_mck_lock,
 185                                            CLK_SET_RATE_GATE, INT_MIN);
 186         if (IS_ERR(hw))
 187                 goto err_free;
 188
 189         hw = at91_clk_register_master_div(regmap, "masterck_div",
 190                                           "masterck_pres",
 191                                           &at91sam9x5_master_layout,
 192                                           &mck_characteristics,
 193                                           &at91sam9n12_mck_lock,
 194                                           CLK_SET_RATE_GATE);
 195         if (IS_ERR(hw))
 196                 goto err_free;
 197
 198         at91sam9n12_pmc->chws[PMC_MCK] = hw;
 199
 200         hw = at91sam9n12_clk_register_usb(regmap, "usbck", "pllbck");
 201         if (IS_ERR(hw))
 202                 goto err_free;
 203
 204         parent_names[0] = slck_name;
 205         parent_names[1] = "mainck";
 206         parent_names[2] = "plladivck";
 207         parent_names[3] = "pllbck";
 208         parent_names[4] = "masterck_div";
 209         for (i = 0; i < 2; i++) {
 210                 char name[6];
 211
 212                 snprintf(name, sizeof(name), "prog%d", i);
 213
 214                 hw = at91_clk_register_programmable(regmap, name,
 215                                                     parent_names, 5, i,
 216                                                     &at91sam9x5_programmable_layout,
 217                                                     NULL);
 218                 if (IS_ERR(hw))
 219                         goto err_free;
 220
 221                 at91sam9n12_pmc->pchws[i] = hw;
 222         }
 223
 224         for (i = 0; i < ARRAY_SIZE(at91sam9n12_systemck); i++) {
 225                 hw = at91_clk_register_system(regmap, at91sam9n12_systemck[i].n,
 226                                               at91sam9n12_systemck[i].p,
 227                                               at91sam9n12_systemck[i].id);
 228                 if (IS_ERR(hw))
 229                         goto err_free;
 230
 231                 at91sam9n12_pmc->shws[at91sam9n12_systemck[i].id] = hw;
 232         }
 233
 234         for (i = 0; i < ARRAY_SIZE(at91sam9n12_periphck); i++) {
 235                 hw = at91_clk_register_sam9x5_peripheral(regmap, &pmc_pcr_lock,
 236                                                          &at91sam9n12_pcr_layout,
 237                                                          at91sam9n12_periphck[i].n,
 238                                                          "masterck_div",
 239                                                          at91sam9n12_periphck[i].id,
 240                                                          &range, INT_MIN);
 241                 if (IS_ERR(hw))
 242                         goto err_free;
 243
 244                 at91sam9n12_pmc->phws[at91sam9n12_periphck[i].id] = hw;
 245         }
 246
 247         of_clk_add_hw_provider(np, of_clk_hw_pmc_get, at91sam9n12_pmc);
 248
 249         return;
 250
 251 err_free:
 252         kfree(at91sam9n12_pmc);
 253 }
 254 /*
 255  * The TCB is used as the clocksource so its clock is needed early. This means
 256  * this can't be a platform driver.
 257  */
 258 CLK_OF_DECLARE_DRIVER(at91sam9n12_pmc, "atmel,at91sam9n12-pmc",
 259                       at91sam9n12_pmc_setup);