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 if (IS_ERR(hw)) 186 goto err_free; 187 188 hw = at91_clk_register_master_div(regmap, "masterck_div", 189 "masterck_pres", 190 &at91sam9x5_master_layout, 191 &mck_characteristics, 192 &at91sam9n12_mck_lock, 193 CLK_SET_RATE_GATE, 0); 194 if (IS_ERR(hw)) 195 goto err_free; 196 197 at91sam9n12_pmc->chws[PMC_MCK] = hw; 198 199 hw = at91sam9n12_clk_register_usb(regmap, "usbck", "pllbck"); 200 if (IS_ERR(hw)) 201 goto err_free; 202 203 parent_names[0] = slck_name; 204 parent_names[1] = "mainck"; 205 parent_names[2] = "plladivck"; 206 parent_names[3] = "pllbck"; 207 parent_names[4] = "masterck_div"; 208 for (i = 0; i < 2; i++) { 209 char name[6]; 210 211 snprintf(name, sizeof(name), "prog%d", i); 212 213 hw = at91_clk_register_programmable(regmap, name, 214 parent_names, 5, i, 215 &at91sam9x5_programmable_layout, 216 NULL); 217 if (IS_ERR(hw)) 218 goto err_free; 219 220 at91sam9n12_pmc->pchws[i] = hw; 221 } 222 223 for (i = 0; i < ARRAY_SIZE(at91sam9n12_systemck); i++) { 224 hw = at91_clk_register_system(regmap, at91sam9n12_systemck[i].n, 225 at91sam9n12_systemck[i].p, 226 at91sam9n12_systemck[i].id); 227 if (IS_ERR(hw)) 228 goto err_free; 229 230 at91sam9n12_pmc->shws[at91sam9n12_systemck[i].id] = hw; 231 } 232 233 for (i = 0; i < ARRAY_SIZE(at91sam9n12_periphck); i++) { 234 hw = at91_clk_register_sam9x5_peripheral(regmap, &pmc_pcr_lock, 235 &at91sam9n12_pcr_layout, 236 at91sam9n12_periphck[i].n, 237 "masterck_div", 238 at91sam9n12_periphck[i].id, 239 &range, INT_MIN); 240 if (IS_ERR(hw)) 241 goto err_free; 242 243 at91sam9n12_pmc->phws[at91sam9n12_periphck[i].id] = hw; 244 } 245 246 of_clk_add_hw_provider(np, of_clk_hw_pmc_get, at91sam9n12_pmc); 247 248 return; 249 250 err_free: 251 kfree(at91sam9n12_pmc); 252 } 253 /* 254 * The TCB is used as the clocksource so its clock is needed early. This means 255 * this can't be a platform driver. 256 */ 257 CLK_OF_DECLARE(at91sam9n12_pmc, "atmel,at91sam9n12-pmc", at91sam9n12_pmc_setup); 258