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(rm9200_mck_lock); 11 12 struct sck { 13 char *n; 14 char *p; 15 u8 id; 16 }; 17 18 struct pck { 19 char *n; 20 u8 id; 21 }; 22 23 static const struct clk_master_characteristics rm9200_mck_characteristics = { 24 .output = { .min = 0, .max = 80000000 }, 25 .divisors = { 1, 2, 3, 4 }, 26 }; 27 28 static u8 rm9200_pll_out[] = { 0, 2 }; 29 30 static const struct clk_range rm9200_pll_outputs[] = { 31 { .min = 80000000, .max = 160000000 }, 32 { .min = 150000000, .max = 180000000 }, 33 }; 34 35 static const struct clk_pll_characteristics rm9200_pll_characteristics = { 36 .input = { .min = 1000000, .max = 32000000 }, 37 .num_output = ARRAY_SIZE(rm9200_pll_outputs), 38 .output = rm9200_pll_outputs, 39 .out = rm9200_pll_out, 40 }; 41 42 static const struct sck at91rm9200_systemck[] = { 43 { .n = "udpck", .p = "usbck", .id = 1 }, 44 { .n = "uhpck", .p = "usbck", .id = 4 }, 45 { .n = "pck0", .p = "prog0", .id = 8 }, 46 { .n = "pck1", .p = "prog1", .id = 9 }, 47 { .n = "pck2", .p = "prog2", .id = 10 }, 48 { .n = "pck3", .p = "prog3", .id = 11 }, 49 }; 50 51 static const struct pck at91rm9200_periphck[] = { 52 { .n = "pioA_clk", .id = 2 }, 53 { .n = "pioB_clk", .id = 3 }, 54 { .n = "pioC_clk", .id = 4 }, 55 { .n = "pioD_clk", .id = 5 }, 56 { .n = "usart0_clk", .id = 6 }, 57 { .n = "usart1_clk", .id = 7 }, 58 { .n = "usart2_clk", .id = 8 }, 59 { .n = "usart3_clk", .id = 9 }, 60 { .n = "mci0_clk", .id = 10 }, 61 { .n = "udc_clk", .id = 11 }, 62 { .n = "twi0_clk", .id = 12 }, 63 { .n = "spi0_clk", .id = 13 }, 64 { .n = "ssc0_clk", .id = 14 }, 65 { .n = "ssc1_clk", .id = 15 }, 66 { .n = "ssc2_clk", .id = 16 }, 67 { .n = "tc0_clk", .id = 17 }, 68 { .n = "tc1_clk", .id = 18 }, 69 { .n = "tc2_clk", .id = 19 }, 70 { .n = "tc3_clk", .id = 20 }, 71 { .n = "tc4_clk", .id = 21 }, 72 { .n = "tc5_clk", .id = 22 }, 73 { .n = "ohci_clk", .id = 23 }, 74 { .n = "macb0_clk", .id = 24 }, 75 }; 76 77 static void __init at91rm9200_pmc_setup(struct device_node *np) 78 { 79 const char *slowxtal_name, *mainxtal_name; 80 struct pmc_data *at91rm9200_pmc; 81 u32 usb_div[] = { 1, 2, 0, 0 }; 82 const char *parent_names[6]; 83 struct regmap *regmap; 84 struct clk_hw *hw; 85 int i; 86 bool bypass; 87 88 i = of_property_match_string(np, "clock-names", "slow_xtal"); 89 if (i < 0) 90 return; 91 92 slowxtal_name = of_clk_get_parent_name(np, i); 93 94 i = of_property_match_string(np, "clock-names", "main_xtal"); 95 if (i < 0) 96 return; 97 mainxtal_name = of_clk_get_parent_name(np, i); 98 99 regmap = device_node_to_regmap(np); 100 if (IS_ERR(regmap)) 101 return; 102 103 at91rm9200_pmc = pmc_data_allocate(PMC_PLLBCK + 1, 104 nck(at91rm9200_systemck), 105 nck(at91rm9200_periphck), 0, 4); 106 if (!at91rm9200_pmc) 107 return; 108 109 bypass = of_property_read_bool(np, "atmel,osc-bypass"); 110 111 hw = at91_clk_register_main_osc(regmap, "main_osc", mainxtal_name, NULL, 112 bypass); 113 if (IS_ERR(hw)) 114 goto err_free; 115 116 hw = at91_clk_register_rm9200_main(regmap, "mainck", "main_osc", NULL); 117 if (IS_ERR(hw)) 118 goto err_free; 119 120 at91rm9200_pmc->chws[PMC_MAIN] = hw; 121 122 hw = at91_clk_register_pll(regmap, "pllack", "mainck", 0, 123 &at91rm9200_pll_layout, 124 &rm9200_pll_characteristics); 125 if (IS_ERR(hw)) 126 goto err_free; 127 128 at91rm9200_pmc->chws[PMC_PLLACK] = hw; 129 130 hw = at91_clk_register_pll(regmap, "pllbck", "mainck", 1, 131 &at91rm9200_pll_layout, 132 &rm9200_pll_characteristics); 133 if (IS_ERR(hw)) 134 goto err_free; 135 136 at91rm9200_pmc->chws[PMC_PLLBCK] = hw; 137 138 parent_names[0] = slowxtal_name; 139 parent_names[1] = "mainck"; 140 parent_names[2] = "pllack"; 141 parent_names[3] = "pllbck"; 142 hw = at91_clk_register_master_pres(regmap, "masterck_pres", 4, 143 parent_names, NULL, 144 &at91rm9200_master_layout, 145 &rm9200_mck_characteristics, 146 &rm9200_mck_lock); 147 if (IS_ERR(hw)) 148 goto err_free; 149 150 hw = at91_clk_register_master_div(regmap, "masterck_div", 151 "masterck_pres", NULL, 152 &at91rm9200_master_layout, 153 &rm9200_mck_characteristics, 154 &rm9200_mck_lock, CLK_SET_RATE_GATE, 0); 155 if (IS_ERR(hw)) 156 goto err_free; 157 158 at91rm9200_pmc->chws[PMC_MCK] = hw; 159 160 hw = at91rm9200_clk_register_usb(regmap, "usbck", "pllbck", usb_div); 161 if (IS_ERR(hw)) 162 goto err_free; 163 164 parent_names[0] = slowxtal_name; 165 parent_names[1] = "mainck"; 166 parent_names[2] = "pllack"; 167 parent_names[3] = "pllbck"; 168 for (i = 0; i < 4; i++) { 169 char name[6]; 170 171 snprintf(name, sizeof(name), "prog%d", i); 172 173 hw = at91_clk_register_programmable(regmap, name, 174 parent_names, NULL, 4, i, 175 &at91rm9200_programmable_layout, 176 NULL); 177 if (IS_ERR(hw)) 178 goto err_free; 179 180 at91rm9200_pmc->pchws[i] = hw; 181 } 182 183 for (i = 0; i < ARRAY_SIZE(at91rm9200_systemck); i++) { 184 hw = at91_clk_register_system(regmap, at91rm9200_systemck[i].n, 185 at91rm9200_systemck[i].p, NULL, 186 at91rm9200_systemck[i].id, 0); 187 if (IS_ERR(hw)) 188 goto err_free; 189 190 at91rm9200_pmc->shws[at91rm9200_systemck[i].id] = hw; 191 } 192 193 for (i = 0; i < ARRAY_SIZE(at91rm9200_periphck); i++) { 194 hw = at91_clk_register_peripheral(regmap, 195 at91rm9200_periphck[i].n, 196 "masterck_div", NULL, 197 at91rm9200_periphck[i].id); 198 if (IS_ERR(hw)) 199 goto err_free; 200 201 at91rm9200_pmc->phws[at91rm9200_periphck[i].id] = hw; 202 } 203 204 of_clk_add_hw_provider(np, of_clk_hw_pmc_get, at91rm9200_pmc); 205 206 return; 207 208 err_free: 209 kfree(at91rm9200_pmc); 210 } 211 /* 212 * While the TCB can be used as the clocksource, the system timer is most likely 213 * to be used instead. However, the pinctrl driver doesn't support probe 214 * deferring properly. Once this is fixed, this can be switched to a platform 215 * driver. 216 */ 217 CLK_OF_DECLARE(at91rm9200_pmc, "atmel,at91rm9200-pmc", at91rm9200_pmc_setup); 218