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/io.h> 17 #include <linux/interrupt.h> 18 #include <linux/irq.h> 19 #include <linux/irqchip/chained_irq.h> 20 #include <linux/irqdomain.h> 21 #include <linux/of_irq.h> 22 23 #include <asm/proc-fns.h> 24 25 #include "pmc.h" 26 27 void __iomem *at91_pmc_base; 28 EXPORT_SYMBOL_GPL(at91_pmc_base); 29 30 void at91rm9200_idle(void) 31 { 32 /* 33 * Disable the processor clock. The processor will be automatically 34 * re-enabled by an interrupt or by a reset. 35 */ 36 at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK); 37 } 38 39 void at91sam9_idle(void) 40 { 41 at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK); 42 cpu_do_idle(); 43 } 44 45 int of_at91_get_clk_range(struct device_node *np, const char *propname, 46 struct clk_range *range) 47 { 48 u32 min, max; 49 int ret; 50 51 ret = of_property_read_u32_index(np, propname, 0, &min); 52 if (ret) 53 return ret; 54 55 ret = of_property_read_u32_index(np, propname, 1, &max); 56 if (ret) 57 return ret; 58 59 if (range) { 60 range->min = min; 61 range->max = max; 62 } 63 64 return 0; 65 } 66 EXPORT_SYMBOL_GPL(of_at91_get_clk_range); 67 68 static void pmc_irq_mask(struct irq_data *d) 69 { 70 struct at91_pmc *pmc = irq_data_get_irq_chip_data(d); 71 72 pmc_write(pmc, AT91_PMC_IDR, 1 << d->hwirq); 73 } 74 75 static void pmc_irq_unmask(struct irq_data *d) 76 { 77 struct at91_pmc *pmc = irq_data_get_irq_chip_data(d); 78 79 pmc_write(pmc, AT91_PMC_IER, 1 << d->hwirq); 80 } 81 82 static int pmc_irq_set_type(struct irq_data *d, unsigned type) 83 { 84 if (type != IRQ_TYPE_LEVEL_HIGH) { 85 pr_warn("PMC: type not supported (support only IRQ_TYPE_LEVEL_HIGH type)\n"); 86 return -EINVAL; 87 } 88 89 return 0; 90 } 91 92 static void pmc_irq_suspend(struct irq_data *d) 93 { 94 struct at91_pmc *pmc = irq_data_get_irq_chip_data(d); 95 96 pmc->imr = pmc_read(pmc, AT91_PMC_IMR); 97 pmc_write(pmc, AT91_PMC_IDR, pmc->imr); 98 } 99 100 static void pmc_irq_resume(struct irq_data *d) 101 { 102 struct at91_pmc *pmc = irq_data_get_irq_chip_data(d); 103 104 pmc_write(pmc, AT91_PMC_IER, pmc->imr); 105 } 106 107 static struct irq_chip pmc_irq = { 108 .name = "PMC", 109 .irq_disable = pmc_irq_mask, 110 .irq_mask = pmc_irq_mask, 111 .irq_unmask = pmc_irq_unmask, 112 .irq_set_type = pmc_irq_set_type, 113 .irq_suspend = pmc_irq_suspend, 114 .irq_resume = pmc_irq_resume, 115 }; 116 117 static struct lock_class_key pmc_lock_class; 118 119 static int pmc_irq_map(struct irq_domain *h, unsigned int virq, 120 irq_hw_number_t hw) 121 { 122 struct at91_pmc *pmc = h->host_data; 123 124 irq_set_lockdep_class(virq, &pmc_lock_class); 125 126 irq_set_chip_and_handler(virq, &pmc_irq, 127 handle_level_irq); 128 set_irq_flags(virq, IRQF_VALID); 129 irq_set_chip_data(virq, pmc); 130 131 return 0; 132 } 133 134 static int pmc_irq_domain_xlate(struct irq_domain *d, 135 struct device_node *ctrlr, 136 const u32 *intspec, unsigned int intsize, 137 irq_hw_number_t *out_hwirq, 138 unsigned int *out_type) 139 { 140 struct at91_pmc *pmc = d->host_data; 141 const struct at91_pmc_caps *caps = pmc->caps; 142 143 if (WARN_ON(intsize < 1)) 144 return -EINVAL; 145 146 *out_hwirq = intspec[0]; 147 148 if (!(caps->available_irqs & (1 << *out_hwirq))) 149 return -EINVAL; 150 151 *out_type = IRQ_TYPE_LEVEL_HIGH; 152 153 return 0; 154 } 155 156 static struct irq_domain_ops pmc_irq_ops = { 157 .map = pmc_irq_map, 158 .xlate = pmc_irq_domain_xlate, 159 }; 160 161 static irqreturn_t pmc_irq_handler(int irq, void *data) 162 { 163 struct at91_pmc *pmc = (struct at91_pmc *)data; 164 unsigned long sr; 165 int n; 166 167 sr = pmc_read(pmc, AT91_PMC_SR) & pmc_read(pmc, AT91_PMC_IMR); 168 if (!sr) 169 return IRQ_NONE; 170 171 for_each_set_bit(n, &sr, BITS_PER_LONG) 172 generic_handle_irq(irq_find_mapping(pmc->irqdomain, n)); 173 174 return IRQ_HANDLED; 175 } 176 177 static const struct at91_pmc_caps at91rm9200_caps = { 178 .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB | 179 AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY | 180 AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY | 181 AT91_PMC_PCK3RDY, 182 }; 183 184 static const struct at91_pmc_caps at91sam9260_caps = { 185 .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB | 186 AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY | 187 AT91_PMC_PCK1RDY, 188 }; 189 190 static const struct at91_pmc_caps at91sam9g45_caps = { 191 .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY | 192 AT91_PMC_LOCKU | AT91_PMC_PCK0RDY | 193 AT91_PMC_PCK1RDY, 194 }; 195 196 static const struct at91_pmc_caps at91sam9n12_caps = { 197 .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB | 198 AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY | 199 AT91_PMC_PCK1RDY | AT91_PMC_MOSCSELS | 200 AT91_PMC_MOSCRCS | AT91_PMC_CFDEV, 201 }; 202 203 static const struct at91_pmc_caps at91sam9x5_caps = { 204 .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY | 205 AT91_PMC_LOCKU | AT91_PMC_PCK0RDY | 206 AT91_PMC_PCK1RDY | AT91_PMC_MOSCSELS | 207 AT91_PMC_MOSCRCS | AT91_PMC_CFDEV, 208 }; 209 210 static const struct at91_pmc_caps sama5d3_caps = { 211 .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY | 212 AT91_PMC_LOCKU | AT91_PMC_PCK0RDY | 213 AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY | 214 AT91_PMC_MOSCSELS | AT91_PMC_MOSCRCS | 215 AT91_PMC_CFDEV, 216 }; 217 218 static struct at91_pmc *__init at91_pmc_init(struct device_node *np, 219 void __iomem *regbase, int virq, 220 const struct at91_pmc_caps *caps) 221 { 222 struct at91_pmc *pmc; 223 224 if (!regbase || !virq || !caps) 225 return NULL; 226 227 at91_pmc_base = regbase; 228 229 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 230 if (!pmc) 231 return NULL; 232 233 spin_lock_init(&pmc->lock); 234 pmc->regbase = regbase; 235 pmc->virq = virq; 236 pmc->caps = caps; 237 238 pmc->irqdomain = irq_domain_add_linear(np, 32, &pmc_irq_ops, pmc); 239 240 if (!pmc->irqdomain) 241 goto out_free_pmc; 242 243 pmc_write(pmc, AT91_PMC_IDR, 0xffffffff); 244 if (request_irq(pmc->virq, pmc_irq_handler, 245 IRQF_SHARED | IRQF_COND_SUSPEND, "pmc", pmc)) 246 goto out_remove_irqdomain; 247 248 return pmc; 249 250 out_remove_irqdomain: 251 irq_domain_remove(pmc->irqdomain); 252 out_free_pmc: 253 kfree(pmc); 254 255 return NULL; 256 } 257 258 static const struct of_device_id pmc_clk_ids[] __initconst = { 259 /* Slow oscillator */ 260 { 261 .compatible = "atmel,at91sam9260-clk-slow", 262 .data = of_at91sam9260_clk_slow_setup, 263 }, 264 /* Main clock */ 265 { 266 .compatible = "atmel,at91rm9200-clk-main-osc", 267 .data = of_at91rm9200_clk_main_osc_setup, 268 }, 269 { 270 .compatible = "atmel,at91sam9x5-clk-main-rc-osc", 271 .data = of_at91sam9x5_clk_main_rc_osc_setup, 272 }, 273 { 274 .compatible = "atmel,at91rm9200-clk-main", 275 .data = of_at91rm9200_clk_main_setup, 276 }, 277 { 278 .compatible = "atmel,at91sam9x5-clk-main", 279 .data = of_at91sam9x5_clk_main_setup, 280 }, 281 /* PLL clocks */ 282 { 283 .compatible = "atmel,at91rm9200-clk-pll", 284 .data = of_at91rm9200_clk_pll_setup, 285 }, 286 { 287 .compatible = "atmel,at91sam9g45-clk-pll", 288 .data = of_at91sam9g45_clk_pll_setup, 289 }, 290 { 291 .compatible = "atmel,at91sam9g20-clk-pllb", 292 .data = of_at91sam9g20_clk_pllb_setup, 293 }, 294 { 295 .compatible = "atmel,sama5d3-clk-pll", 296 .data = of_sama5d3_clk_pll_setup, 297 }, 298 { 299 .compatible = "atmel,at91sam9x5-clk-plldiv", 300 .data = of_at91sam9x5_clk_plldiv_setup, 301 }, 302 /* Master clock */ 303 { 304 .compatible = "atmel,at91rm9200-clk-master", 305 .data = of_at91rm9200_clk_master_setup, 306 }, 307 { 308 .compatible = "atmel,at91sam9x5-clk-master", 309 .data = of_at91sam9x5_clk_master_setup, 310 }, 311 /* System clocks */ 312 { 313 .compatible = "atmel,at91rm9200-clk-system", 314 .data = of_at91rm9200_clk_sys_setup, 315 }, 316 /* Peripheral clocks */ 317 { 318 .compatible = "atmel,at91rm9200-clk-peripheral", 319 .data = of_at91rm9200_clk_periph_setup, 320 }, 321 { 322 .compatible = "atmel,at91sam9x5-clk-peripheral", 323 .data = of_at91sam9x5_clk_periph_setup, 324 }, 325 /* Programmable clocks */ 326 { 327 .compatible = "atmel,at91rm9200-clk-programmable", 328 .data = of_at91rm9200_clk_prog_setup, 329 }, 330 { 331 .compatible = "atmel,at91sam9g45-clk-programmable", 332 .data = of_at91sam9g45_clk_prog_setup, 333 }, 334 { 335 .compatible = "atmel,at91sam9x5-clk-programmable", 336 .data = of_at91sam9x5_clk_prog_setup, 337 }, 338 /* UTMI clock */ 339 #if defined(CONFIG_HAVE_AT91_UTMI) 340 { 341 .compatible = "atmel,at91sam9x5-clk-utmi", 342 .data = of_at91sam9x5_clk_utmi_setup, 343 }, 344 #endif 345 /* USB clock */ 346 #if defined(CONFIG_HAVE_AT91_USB_CLK) 347 { 348 .compatible = "atmel,at91rm9200-clk-usb", 349 .data = of_at91rm9200_clk_usb_setup, 350 }, 351 { 352 .compatible = "atmel,at91sam9x5-clk-usb", 353 .data = of_at91sam9x5_clk_usb_setup, 354 }, 355 { 356 .compatible = "atmel,at91sam9n12-clk-usb", 357 .data = of_at91sam9n12_clk_usb_setup, 358 }, 359 #endif 360 /* SMD clock */ 361 #if defined(CONFIG_HAVE_AT91_SMD) 362 { 363 .compatible = "atmel,at91sam9x5-clk-smd", 364 .data = of_at91sam9x5_clk_smd_setup, 365 }, 366 #endif 367 #if defined(CONFIG_HAVE_AT91_H32MX) 368 { 369 .compatible = "atmel,sama5d4-clk-h32mx", 370 .data = of_sama5d4_clk_h32mx_setup, 371 }, 372 #endif 373 { /*sentinel*/ } 374 }; 375 376 static void __init of_at91_pmc_setup(struct device_node *np, 377 const struct at91_pmc_caps *caps) 378 { 379 struct at91_pmc *pmc; 380 struct device_node *childnp; 381 void (*clk_setup)(struct device_node *, struct at91_pmc *); 382 const struct of_device_id *clk_id; 383 void __iomem *regbase = of_iomap(np, 0); 384 int virq; 385 386 if (!regbase) 387 return; 388 389 virq = irq_of_parse_and_map(np, 0); 390 if (!virq) 391 return; 392 393 pmc = at91_pmc_init(np, regbase, virq, caps); 394 if (!pmc) 395 return; 396 for_each_child_of_node(np, childnp) { 397 clk_id = of_match_node(pmc_clk_ids, childnp); 398 if (!clk_id) 399 continue; 400 clk_setup = clk_id->data; 401 clk_setup(childnp, pmc); 402 } 403 } 404 405 static void __init of_at91rm9200_pmc_setup(struct device_node *np) 406 { 407 of_at91_pmc_setup(np, &at91rm9200_caps); 408 } 409 CLK_OF_DECLARE(at91rm9200_clk_pmc, "atmel,at91rm9200-pmc", 410 of_at91rm9200_pmc_setup); 411 412 static void __init of_at91sam9260_pmc_setup(struct device_node *np) 413 { 414 of_at91_pmc_setup(np, &at91sam9260_caps); 415 } 416 CLK_OF_DECLARE(at91sam9260_clk_pmc, "atmel,at91sam9260-pmc", 417 of_at91sam9260_pmc_setup); 418 419 static void __init of_at91sam9g45_pmc_setup(struct device_node *np) 420 { 421 of_at91_pmc_setup(np, &at91sam9g45_caps); 422 } 423 CLK_OF_DECLARE(at91sam9g45_clk_pmc, "atmel,at91sam9g45-pmc", 424 of_at91sam9g45_pmc_setup); 425 426 static void __init of_at91sam9n12_pmc_setup(struct device_node *np) 427 { 428 of_at91_pmc_setup(np, &at91sam9n12_caps); 429 } 430 CLK_OF_DECLARE(at91sam9n12_clk_pmc, "atmel,at91sam9n12-pmc", 431 of_at91sam9n12_pmc_setup); 432 433 static void __init of_at91sam9x5_pmc_setup(struct device_node *np) 434 { 435 of_at91_pmc_setup(np, &at91sam9x5_caps); 436 } 437 CLK_OF_DECLARE(at91sam9x5_clk_pmc, "atmel,at91sam9x5-pmc", 438 of_at91sam9x5_pmc_setup); 439 440 static void __init of_sama5d3_pmc_setup(struct device_node *np) 441 { 442 of_at91_pmc_setup(np, &sama5d3_caps); 443 } 444 CLK_OF_DECLARE(sama5d3_clk_pmc, "atmel,sama5d3-pmc", 445 of_sama5d3_pmc_setup); 446