1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/arch/arm/mach-pxa/pxa3xx.c 4 * 5 * code specific to pxa3xx aka Monahans 6 * 7 * Copyright (C) 2006 Marvell International Ltd. 8 * 9 * 2007-09-02: eric miao <eric.miao@marvell.com> 10 * initial version 11 */ 12 #include <linux/dmaengine.h> 13 #include <linux/dma/pxa-dma.h> 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/init.h> 17 #include <linux/gpio-pxa.h> 18 #include <linux/pm.h> 19 #include <linux/platform_device.h> 20 #include <linux/irq.h> 21 #include <linux/irqchip.h> 22 #include <linux/io.h> 23 #include <linux/of.h> 24 #include <linux/syscore_ops.h> 25 #include <linux/platform_data/i2c-pxa.h> 26 #include <linux/platform_data/mmp_dma.h> 27 #include <linux/soc/pxa/cpu.h> 28 #include <linux/clk/pxa.h> 29 30 #include <asm/mach/map.h> 31 #include <asm/suspend.h> 32 #include "pxa3xx-regs.h" 33 #include "reset.h" 34 #include <linux/platform_data/usb-ohci-pxa27x.h> 35 #include "pm.h" 36 #include "addr-map.h" 37 #include "smemc.h" 38 #include "irqs.h" 39 40 #include "generic.h" 41 #include "devices.h" 42 43 #define PECR_IE(n) ((1 << ((n) * 2)) << 28) 44 #define PECR_IS(n) ((1 << ((n) * 2)) << 29) 45 46 extern void __init pxa_dt_irq_init(int (*fn)(struct irq_data *, unsigned int)); 47 48 /* 49 * NAND NFC: DFI bus arbitration subset 50 */ 51 #define NDCR (*(volatile u32 __iomem*)(NAND_VIRT + 0)) 52 #define NDCR_ND_ARB_EN (1 << 12) 53 #define NDCR_ND_ARB_CNTL (1 << 19) 54 55 #define CKEN_BOOT 11 /* < Boot rom clock enable */ 56 #define CKEN_TPM 19 /* < TPM clock enable */ 57 #define CKEN_HSIO2 41 /* < HSIO2 clock enable */ 58 59 #ifdef CONFIG_PM 60 61 #define ISRAM_START 0x5c000000 62 #define ISRAM_SIZE SZ_256K 63 64 static void __iomem *sram; 65 static unsigned long wakeup_src; 66 67 /* 68 * Enter a standby mode (S0D1C2 or S0D2C2). Upon wakeup, the dynamic 69 * memory controller has to be reinitialised, so we place some code 70 * in the SRAM to perform this function. 71 * 72 * We disable FIQs across the standby - otherwise, we might receive a 73 * FIQ while the SDRAM is unavailable. 74 */ 75 static void pxa3xx_cpu_standby(unsigned int pwrmode) 76 { 77 void (*fn)(unsigned int) = (void __force *)(sram + 0x8000); 78 79 memcpy_toio(sram + 0x8000, pm_enter_standby_start, 80 pm_enter_standby_end - pm_enter_standby_start); 81 82 AD2D0SR = ~0; 83 AD2D1SR = ~0; 84 AD2D0ER = wakeup_src; 85 AD2D1ER = 0; 86 ASCR = ASCR; 87 ARSR = ARSR; 88 89 local_fiq_disable(); 90 fn(pwrmode); 91 local_fiq_enable(); 92 93 AD2D0ER = 0; 94 AD2D1ER = 0; 95 } 96 97 /* 98 * NOTE: currently, the OBM (OEM Boot Module) binary comes along with 99 * PXA3xx development kits assumes that the resuming process continues 100 * with the address stored within the first 4 bytes of SDRAM. The PSPR 101 * register is used privately by BootROM and OBM, and _must_ be set to 102 * 0x5c014000 for the moment. 103 */ 104 static void pxa3xx_cpu_pm_suspend(void) 105 { 106 volatile unsigned long *p = (volatile void *)0xc0000000; 107 unsigned long saved_data = *p; 108 #ifndef CONFIG_IWMMXT 109 u64 acc0; 110 111 #ifdef CONFIG_CC_IS_GCC 112 asm volatile(".arch_extension xscale\n\t" 113 "mra %Q0, %R0, acc0" : "=r" (acc0)); 114 #else 115 asm volatile("mrrc p0, 0, %Q0, %R0, c0" : "=r" (acc0)); 116 #endif 117 #endif 118 119 /* resuming from D2 requires the HSIO2/BOOT/TPM clocks enabled */ 120 CKENA |= (1 << CKEN_BOOT) | (1 << CKEN_TPM); 121 CKENB |= 1 << (CKEN_HSIO2 & 0x1f); 122 123 /* clear and setup wakeup source */ 124 AD3SR = ~0; 125 AD3ER = wakeup_src; 126 ASCR = ASCR; 127 ARSR = ARSR; 128 129 PCFR |= (1u << 13); /* L1_DIS */ 130 PCFR &= ~((1u << 12) | (1u << 1)); /* L0_EN | SL_ROD */ 131 132 PSPR = 0x5c014000; 133 134 /* overwrite with the resume address */ 135 *p = __pa_symbol(cpu_resume); 136 137 cpu_suspend(0, pxa3xx_finish_suspend); 138 139 *p = saved_data; 140 141 AD3ER = 0; 142 143 #ifndef CONFIG_IWMMXT 144 #ifndef CONFIG_AS_IS_LLVM 145 asm volatile(".arch_extension xscale\n\t" 146 "mar acc0, %Q0, %R0" : "=r" (acc0)); 147 #else 148 asm volatile("mcrr p0, 0, %Q0, %R0, c0" :: "r" (acc0)); 149 #endif 150 #endif 151 } 152 153 static void pxa3xx_cpu_pm_enter(suspend_state_t state) 154 { 155 /* 156 * Don't sleep if no wakeup sources are defined 157 */ 158 if (wakeup_src == 0) { 159 printk(KERN_ERR "Not suspending: no wakeup sources\n"); 160 return; 161 } 162 163 switch (state) { 164 case PM_SUSPEND_STANDBY: 165 pxa3xx_cpu_standby(PXA3xx_PM_S0D2C2); 166 break; 167 168 case PM_SUSPEND_MEM: 169 pxa3xx_cpu_pm_suspend(); 170 break; 171 } 172 } 173 174 static int pxa3xx_cpu_pm_valid(suspend_state_t state) 175 { 176 return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY; 177 } 178 179 static struct pxa_cpu_pm_fns pxa3xx_cpu_pm_fns = { 180 .valid = pxa3xx_cpu_pm_valid, 181 .enter = pxa3xx_cpu_pm_enter, 182 }; 183 184 static void __init pxa3xx_init_pm(void) 185 { 186 sram = ioremap(ISRAM_START, ISRAM_SIZE); 187 if (!sram) { 188 printk(KERN_ERR "Unable to map ISRAM: disabling standby/suspend\n"); 189 return; 190 } 191 192 /* 193 * Since we copy wakeup code into the SRAM, we need to ensure 194 * that it is preserved over the low power modes. Note: bit 8 195 * is undocumented in the developer manual, but must be set. 196 */ 197 AD1R |= ADXR_L2 | ADXR_R0; 198 AD2R |= ADXR_L2 | ADXR_R0; 199 AD3R |= ADXR_L2 | ADXR_R0; 200 201 /* 202 * Clear the resume enable registers. 203 */ 204 AD1D0ER = 0; 205 AD2D0ER = 0; 206 AD2D1ER = 0; 207 AD3ER = 0; 208 209 pxa_cpu_pm_fns = &pxa3xx_cpu_pm_fns; 210 } 211 212 static int pxa3xx_set_wake(struct irq_data *d, unsigned int on) 213 { 214 unsigned long flags, mask = 0; 215 216 switch (d->irq) { 217 case IRQ_SSP3: 218 mask = ADXER_MFP_WSSP3; 219 break; 220 case IRQ_MSL: 221 mask = ADXER_WMSL0; 222 break; 223 case IRQ_USBH2: 224 case IRQ_USBH1: 225 mask = ADXER_WUSBH; 226 break; 227 case IRQ_KEYPAD: 228 mask = ADXER_WKP; 229 break; 230 case IRQ_AC97: 231 mask = ADXER_MFP_WAC97; 232 break; 233 case IRQ_USIM: 234 mask = ADXER_WUSIM0; 235 break; 236 case IRQ_SSP2: 237 mask = ADXER_MFP_WSSP2; 238 break; 239 case IRQ_I2C: 240 mask = ADXER_MFP_WI2C; 241 break; 242 case IRQ_STUART: 243 mask = ADXER_MFP_WUART3; 244 break; 245 case IRQ_BTUART: 246 mask = ADXER_MFP_WUART2; 247 break; 248 case IRQ_FFUART: 249 mask = ADXER_MFP_WUART1; 250 break; 251 case IRQ_MMC: 252 mask = ADXER_MFP_WMMC1; 253 break; 254 case IRQ_SSP: 255 mask = ADXER_MFP_WSSP1; 256 break; 257 case IRQ_RTCAlrm: 258 mask = ADXER_WRTC; 259 break; 260 case IRQ_SSP4: 261 mask = ADXER_MFP_WSSP4; 262 break; 263 case IRQ_TSI: 264 mask = ADXER_WTSI; 265 break; 266 case IRQ_USIM2: 267 mask = ADXER_WUSIM1; 268 break; 269 case IRQ_MMC2: 270 mask = ADXER_MFP_WMMC2; 271 break; 272 case IRQ_NAND: 273 mask = ADXER_MFP_WFLASH; 274 break; 275 case IRQ_USB2: 276 mask = ADXER_WUSB2; 277 break; 278 case IRQ_WAKEUP0: 279 mask = ADXER_WEXTWAKE0; 280 break; 281 case IRQ_WAKEUP1: 282 mask = ADXER_WEXTWAKE1; 283 break; 284 case IRQ_MMC3: 285 mask = ADXER_MFP_GEN12; 286 break; 287 default: 288 return -EINVAL; 289 } 290 291 local_irq_save(flags); 292 if (on) 293 wakeup_src |= mask; 294 else 295 wakeup_src &= ~mask; 296 local_irq_restore(flags); 297 298 return 0; 299 } 300 #else 301 static inline void pxa3xx_init_pm(void) {} 302 #define pxa3xx_set_wake NULL 303 #endif 304 305 static void pxa_ack_ext_wakeup(struct irq_data *d) 306 { 307 PECR |= PECR_IS(d->irq - IRQ_WAKEUP0); 308 } 309 310 static void pxa_mask_ext_wakeup(struct irq_data *d) 311 { 312 pxa_mask_irq(d); 313 PECR &= ~PECR_IE(d->irq - IRQ_WAKEUP0); 314 } 315 316 static void pxa_unmask_ext_wakeup(struct irq_data *d) 317 { 318 pxa_unmask_irq(d); 319 PECR |= PECR_IE(d->irq - IRQ_WAKEUP0); 320 } 321 322 static int pxa_set_ext_wakeup_type(struct irq_data *d, unsigned int flow_type) 323 { 324 if (flow_type & IRQ_TYPE_EDGE_RISING) 325 PWER |= 1 << (d->irq - IRQ_WAKEUP0); 326 327 if (flow_type & IRQ_TYPE_EDGE_FALLING) 328 PWER |= 1 << (d->irq - IRQ_WAKEUP0 + 2); 329 330 return 0; 331 } 332 333 static struct irq_chip pxa_ext_wakeup_chip = { 334 .name = "WAKEUP", 335 .irq_ack = pxa_ack_ext_wakeup, 336 .irq_mask = pxa_mask_ext_wakeup, 337 .irq_unmask = pxa_unmask_ext_wakeup, 338 .irq_set_type = pxa_set_ext_wakeup_type, 339 }; 340 341 static void __init pxa_init_ext_wakeup_irq(int (*fn)(struct irq_data *, 342 unsigned int)) 343 { 344 int irq; 345 346 for (irq = IRQ_WAKEUP0; irq <= IRQ_WAKEUP1; irq++) { 347 irq_set_chip_and_handler(irq, &pxa_ext_wakeup_chip, 348 handle_edge_irq); 349 irq_clear_status_flags(irq, IRQ_NOREQUEST); 350 } 351 352 pxa_ext_wakeup_chip.irq_set_wake = fn; 353 } 354 355 static void __init __pxa3xx_init_irq(void) 356 { 357 /* enable CP6 access */ 358 u32 value; 359 __asm__ __volatile__("mrc p15, 0, %0, c15, c1, 0\n": "=r"(value)); 360 value |= (1 << 6); 361 __asm__ __volatile__("mcr p15, 0, %0, c15, c1, 0\n": :"r"(value)); 362 363 pxa_init_ext_wakeup_irq(pxa3xx_set_wake); 364 } 365 366 static int __init __init 367 pxa3xx_dt_init_irq(struct device_node *node, struct device_node *parent) 368 { 369 __pxa3xx_init_irq(); 370 pxa_dt_irq_init(pxa3xx_set_wake); 371 set_handle_irq(ichp_handle_irq); 372 373 return 0; 374 } 375 IRQCHIP_DECLARE(pxa3xx_intc, "marvell,pxa-intc", pxa3xx_dt_init_irq); 376 377 static struct map_desc pxa3xx_io_desc[] __initdata = { 378 { /* Mem Ctl */ 379 .virtual = (unsigned long)SMEMC_VIRT, 380 .pfn = __phys_to_pfn(PXA3XX_SMEMC_BASE), 381 .length = SMEMC_SIZE, 382 .type = MT_DEVICE 383 }, { 384 .virtual = (unsigned long)NAND_VIRT, 385 .pfn = __phys_to_pfn(NAND_PHYS), 386 .length = NAND_SIZE, 387 .type = MT_DEVICE 388 }, 389 }; 390 391 void __init pxa3xx_map_io(void) 392 { 393 pxa_map_io(); 394 iotable_init(ARRAY_AND_SIZE(pxa3xx_io_desc)); 395 pxa3xx_get_clk_frequency_khz(1); 396 } 397 398 static int __init pxa3xx_init(void) 399 { 400 int ret = 0; 401 402 if (cpu_is_pxa3xx()) { 403 404 pxa_register_wdt(ARSR); 405 406 /* 407 * clear RDH bit every time after reset 408 * 409 * Note: the last 3 bits DxS are write-1-to-clear so carefully 410 * preserve them here in case they will be referenced later 411 */ 412 ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S); 413 414 /* 415 * Disable DFI bus arbitration, to prevent a system bus lock if 416 * somebody disables the NAND clock (unused clock) while this 417 * bit remains set. 418 */ 419 NDCR = (NDCR & ~NDCR_ND_ARB_EN) | NDCR_ND_ARB_CNTL; 420 421 pxa3xx_init_pm(); 422 423 enable_irq_wake(IRQ_WAKEUP0); 424 if (cpu_is_pxa320()) 425 enable_irq_wake(IRQ_WAKEUP1); 426 427 register_syscore_ops(&pxa_irq_syscore_ops); 428 register_syscore_ops(&pxa3xx_mfp_syscore_ops); 429 } 430 431 return ret; 432 } 433 434 postcore_initcall(pxa3xx_init); 435