arch/arm/mach-s3c64xx/common.c

   1 /*
   2  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   3  *              http://www.samsung.com
   4  *
   5  * Copyright 2008 Openmoko, Inc.
   6  * Copyright 2008 Simtec Electronics
   7  *      Ben Dooks <ben@simtec.co.uk>
   8  *      http://armlinux.simtec.co.uk/
   9  *
  10  * Common Codes for S3C64XX machines
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 /*
  18  * NOTE: Code in this file is not used when booting with Device Tree support.
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/clk-provider.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/ioport.h>
  27 #include <linux/serial_core.h>
  28 #include <linux/serial_s3c.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/reboot.h>
  31 #include <linux/io.h>
  32 #include <linux/dma-mapping.h>
  33 #include <linux/irq.h>
  34 #include <linux/gpio.h>
  35 #include <linux/irqchip/arm-vic.h>
  36 #include <clocksource/samsung_pwm.h>
  37
  38 #include <asm/mach/arch.h>
  39 #include <asm/mach/map.h>
  40 #include <asm/system_misc.h>
  41
  42 #include <mach/map.h>
  43 #include <mach/hardware.h>
  44 #include <mach/regs-gpio.h>
  45 #include <mach/gpio-samsung.h>
  46
  47 #include <plat/cpu.h>
  48 #include <plat/devs.h>
  49 #include <plat/pm.h>
  50 #include <plat/gpio-cfg.h>
  51 #include <plat/irq-uart.h>
  52 #include <plat/pwm-core.h>
  53 #include <plat/regs-irqtype.h>
  54 #include <plat/watchdog-reset.h>
  55
  56 #include "common.h"
  57
  58 /* External clock frequency */
  59 static unsigned long xtal_f = 12000000, xusbxti_f = 48000000;
  60
  61 void __init s3c64xx_set_xtal_freq(unsigned long freq)
  62 {
  63         xtal_f = freq;
  64 }
  65
  66 void __init s3c64xx_set_xusbxti_freq(unsigned long freq)
  67 {
  68         xusbxti_f = freq;
  69 }
  70
  71 /* uart registration process */
  72
  73 static void __init s3c64xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  74 {
  75         s3c24xx_init_uartdevs("s3c6400-uart", s3c64xx_uart_resources, cfg, no);
  76 }
  77
  78 /* table of supported CPUs */
  79
  80 static const char name_s3c6400[] = "S3C6400";
  81 static const char name_s3c6410[] = "S3C6410";
  82
  83 static struct cpu_table cpu_ids[] __initdata = {
  84         {
  85                 .idcode         = S3C6400_CPU_ID,
  86                 .idmask         = S3C64XX_CPU_MASK,
  87                 .map_io         = s3c6400_map_io,
  88                 .init_uarts     = s3c64xx_init_uarts,
  89                 .init           = s3c6400_init,
  90                 .name           = name_s3c6400,
  91         }, {
  92                 .idcode         = S3C6410_CPU_ID,
  93                 .idmask         = S3C64XX_CPU_MASK,
  94                 .map_io         = s3c6410_map_io,
  95                 .init_uarts     = s3c64xx_init_uarts,
  96                 .init           = s3c6410_init,
  97                 .name           = name_s3c6410,
  98         },
  99 };
 100
 101 /* minimal IO mapping */
 102
 103 /* see notes on uart map in arch/arm/mach-s3c64xx/include/mach/debug-macro.S */
 104 #define UART_OFFS (S3C_PA_UART & 0xfffff)
 105
 106 static struct map_desc s3c_iodesc[] __initdata = {
 107         {
 108                 .virtual        = (unsigned long)S3C_VA_SYS,
 109                 .pfn            = __phys_to_pfn(S3C64XX_PA_SYSCON),
 110                 .length         = SZ_4K,
 111                 .type           = MT_DEVICE,
 112         }, {
 113                 .virtual        = (unsigned long)S3C_VA_MEM,
 114                 .pfn            = __phys_to_pfn(S3C64XX_PA_SROM),
 115                 .length         = SZ_4K,
 116                 .type           = MT_DEVICE,
 117         }, {
 118                 .virtual        = (unsigned long)(S3C_VA_UART + UART_OFFS),
 119                 .pfn            = __phys_to_pfn(S3C_PA_UART),
 120                 .length         = SZ_4K,
 121                 .type           = MT_DEVICE,
 122         }, {
 123                 .virtual        = (unsigned long)VA_VIC0,
 124                 .pfn            = __phys_to_pfn(S3C64XX_PA_VIC0),
 125                 .length         = SZ_16K,
 126                 .type           = MT_DEVICE,
 127         }, {
 128                 .virtual        = (unsigned long)VA_VIC1,
 129                 .pfn            = __phys_to_pfn(S3C64XX_PA_VIC1),
 130                 .length         = SZ_16K,
 131                 .type           = MT_DEVICE,
 132         }, {
 133                 .virtual        = (unsigned long)S3C_VA_TIMER,
 134                 .pfn            = __phys_to_pfn(S3C_PA_TIMER),
 135                 .length         = SZ_16K,
 136                 .type           = MT_DEVICE,
 137         }, {
 138                 .virtual        = (unsigned long)S3C64XX_VA_GPIO,
 139                 .pfn            = __phys_to_pfn(S3C64XX_PA_GPIO),
 140                 .length         = SZ_4K,
 141                 .type           = MT_DEVICE,
 142         }, {
 143                 .virtual        = (unsigned long)S3C64XX_VA_MODEM,
 144                 .pfn            = __phys_to_pfn(S3C64XX_PA_MODEM),
 145                 .length         = SZ_4K,
 146                 .type           = MT_DEVICE,
 147         }, {
 148                 .virtual        = (unsigned long)S3C_VA_WATCHDOG,
 149                 .pfn            = __phys_to_pfn(S3C64XX_PA_WATCHDOG),
 150                 .length         = SZ_4K,
 151                 .type           = MT_DEVICE,
 152         }, {
 153                 .virtual        = (unsigned long)S3C_VA_USB_HSPHY,
 154                 .pfn            = __phys_to_pfn(S3C64XX_PA_USB_HSPHY),
 155                 .length         = SZ_1K,
 156                 .type           = MT_DEVICE,
 157         },
 158 };
 159
 160 static struct bus_type s3c64xx_subsys = {
 161         .name           = "s3c64xx-core",
 162         .dev_name       = "s3c64xx-core",
 163 };
 164
 165 static struct device s3c64xx_dev = {
 166         .bus    = &s3c64xx_subsys,
 167 };
 168
 169 static struct samsung_pwm_variant s3c64xx_pwm_variant = {
 170         .bits           = 32,
 171         .div_base       = 0,
 172         .has_tint_cstat = true,
 173         .tclk_mask      = (1 << 7) | (1 << 6) | (1 << 5),
 174 };
 175
 176 void __init samsung_set_timer_source(unsigned int event, unsigned int source)
 177 {
 178         s3c64xx_pwm_variant.output_mask = BIT(SAMSUNG_PWM_NUM) - 1;
 179         s3c64xx_pwm_variant.output_mask &= ~(BIT(event) | BIT(source));
 180 }
 181
 182 void __init samsung_timer_init(void)
 183 {
 184         unsigned int timer_irqs[SAMSUNG_PWM_NUM] = {
 185                 IRQ_TIMER0_VIC, IRQ_TIMER1_VIC, IRQ_TIMER2_VIC,
 186                 IRQ_TIMER3_VIC, IRQ_TIMER4_VIC,
 187         };
 188
 189         samsung_pwm_clocksource_init(S3C_VA_TIMER,
 190                                         timer_irqs, &s3c64xx_pwm_variant);
 191 }
 192
 193 /* read cpu identification code */
 194
 195 void __init s3c64xx_init_io(struct map_desc *mach_desc, int size)
 196 {
 197         /* initialise the io descriptors we need for initialisation */
 198         iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
 199         iotable_init(mach_desc, size);
 200
 201         /* detect cpu id */
 202         s3c64xx_init_cpu();
 203
 204         s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids));
 205
 206         samsung_pwm_set_platdata(&s3c64xx_pwm_variant);
 207 }
 208
 209 static __init int s3c64xx_dev_init(void)
 210 {
 211         /* Not applicable when using DT. */
 212         if (of_have_populated_dt())
 213                 return 0;
 214
 215         subsys_system_register(&s3c64xx_subsys, NULL);
 216         return device_register(&s3c64xx_dev);
 217 }
 218 core_initcall(s3c64xx_dev_init);
 219
 220 /*
 221  * setup the sources the vic should advertise resume
 222  * for, even though it is not doing the wake
 223  * (set_irq_wake needs to be valid)
 224  */
 225 #define IRQ_VIC0_RESUME (1 << (IRQ_RTC_TIC - IRQ_VIC0_BASE))
 226 #define IRQ_VIC1_RESUME (1 << (IRQ_RTC_ALARM - IRQ_VIC1_BASE) | \
 227                          1 << (IRQ_PENDN - IRQ_VIC1_BASE) |     \
 228                          1 << (IRQ_HSMMC0 - IRQ_VIC1_BASE) |    \
 229                          1 << (IRQ_HSMMC1 - IRQ_VIC1_BASE) |    \
 230                          1 << (IRQ_HSMMC2 - IRQ_VIC1_BASE))
 231
 232 void __init s3c64xx_init_irq(u32 vic0_valid, u32 vic1_valid)
 233 {
 234         /*
 235          * FIXME: there is no better place to put this at the moment
 236          * (s3c64xx_clk_init needs ioremap and must happen before init_time
 237          * samsung_wdt_reset_init needs clocks)
 238          */
 239         s3c64xx_clk_init(NULL, xtal_f, xusbxti_f, soc_is_s3c6400(), S3C_VA_SYS);
 240         samsung_wdt_reset_init(S3C_VA_WATCHDOG);
 241
 242         printk(KERN_DEBUG "%s: initialising interrupts\n", __func__);
 243
 244         /* initialise the pair of VICs */
 245         vic_init(VA_VIC0, IRQ_VIC0_BASE, vic0_valid, IRQ_VIC0_RESUME);
 246         vic_init(VA_VIC1, IRQ_VIC1_BASE, vic1_valid, IRQ_VIC1_RESUME);
 247 }
 248
 249 #define eint_offset(irq)        ((irq) - IRQ_EINT(0))
 250 #define eint_irq_to_bit(irq)    ((u32)(1 << eint_offset(irq)))
 251
 252 static inline void s3c_irq_eint_mask(struct irq_data *data)
 253 {
 254         u32 mask;
 255
 256         mask = __raw_readl(S3C64XX_EINT0MASK);
 257         mask |= (u32)data->chip_data;
 258         __raw_writel(mask, S3C64XX_EINT0MASK);
 259 }
 260
 261 static void s3c_irq_eint_unmask(struct irq_data *data)
 262 {
 263         u32 mask;
 264
 265         mask = __raw_readl(S3C64XX_EINT0MASK);
 266         mask &= ~((u32)data->chip_data);
 267         __raw_writel(mask, S3C64XX_EINT0MASK);
 268 }
 269
 270 static inline void s3c_irq_eint_ack(struct irq_data *data)
 271 {
 272         __raw_writel((u32)data->chip_data, S3C64XX_EINT0PEND);
 273 }
 274
 275 static void s3c_irq_eint_maskack(struct irq_data *data)
 276 {
 277         /* compiler should in-line these */
 278         s3c_irq_eint_mask(data);
 279         s3c_irq_eint_ack(data);
 280 }
 281
 282 static int s3c_irq_eint_set_type(struct irq_data *data, unsigned int type)
 283 {
 284         int offs = eint_offset(data->irq);
 285         int pin, pin_val;
 286         int shift;
 287         u32 ctrl, mask;
 288         u32 newvalue = 0;
 289         void __iomem *reg;
 290
 291         if (offs > 27)
 292                 return -EINVAL;
 293
 294         if (offs <= 15)
 295                 reg = S3C64XX_EINT0CON0;
 296         else
 297                 reg = S3C64XX_EINT0CON1;
 298
 299         switch (type) {
 300         case IRQ_TYPE_NONE:
 301                 printk(KERN_WARNING "No edge setting!\n");
 302                 break;
 303
 304         case IRQ_TYPE_EDGE_RISING:
 305                 newvalue = S3C2410_EXTINT_RISEEDGE;
 306                 break;
 307
 308         case IRQ_TYPE_EDGE_FALLING:
 309                 newvalue = S3C2410_EXTINT_FALLEDGE;
 310                 break;
 311
 312         case IRQ_TYPE_EDGE_BOTH:
 313                 newvalue = S3C2410_EXTINT_BOTHEDGE;
 314                 break;
 315
 316         case IRQ_TYPE_LEVEL_LOW:
 317                 newvalue = S3C2410_EXTINT_LOWLEV;
 318                 break;
 319
 320         case IRQ_TYPE_LEVEL_HIGH:
 321                 newvalue = S3C2410_EXTINT_HILEV;
 322                 break;
 323
 324         default:
 325                 printk(KERN_ERR "No such irq type %d", type);
 326                 return -1;
 327         }
 328
 329         if (offs <= 15)
 330                 shift = (offs / 2) * 4;
 331         else
 332                 shift = ((offs - 16) / 2) * 4;
 333         mask = 0x7 << shift;
 334
 335         ctrl = __raw_readl(reg);
 336         ctrl &= ~mask;
 337         ctrl |= newvalue << shift;
 338         __raw_writel(ctrl, reg);
 339
 340         /* set the GPIO pin appropriately */
 341
 342         if (offs < 16) {
 343                 pin = S3C64XX_GPN(offs);
 344                 pin_val = S3C_GPIO_SFN(2);
 345         } else if (offs < 23) {
 346                 pin = S3C64XX_GPL(offs + 8 - 16);
 347                 pin_val = S3C_GPIO_SFN(3);
 348         } else {
 349                 pin = S3C64XX_GPM(offs - 23);
 350                 pin_val = S3C_GPIO_SFN(3);
 351         }
 352
 353         s3c_gpio_cfgpin(pin, pin_val);
 354
 355         return 0;
 356 }
 357
 358 static struct irq_chip s3c_irq_eint = {
 359         .name           = "s3c-eint",
 360         .irq_mask       = s3c_irq_eint_mask,
 361         .irq_unmask     = s3c_irq_eint_unmask,
 362         .irq_mask_ack   = s3c_irq_eint_maskack,
 363         .irq_ack        = s3c_irq_eint_ack,
 364         .irq_set_type   = s3c_irq_eint_set_type,
 365         .irq_set_wake   = s3c_irqext_wake,
 366 };
 367
 368 /* s3c_irq_demux_eint
 369  *
 370  * This function demuxes the IRQ from the group0 external interrupts,
 371  * from IRQ_EINT(0) to IRQ_EINT(27). It is designed to be inlined into
 372  * the specific handlers s3c_irq_demux_eintX_Y.
 373  */
 374 static inline void s3c_irq_demux_eint(unsigned int start, unsigned int end)
 375 {
 376         u32 status = __raw_readl(S3C64XX_EINT0PEND);
 377         u32 mask = __raw_readl(S3C64XX_EINT0MASK);
 378         unsigned int irq;
 379
 380         status &= ~mask;
 381         status >>= start;
 382         status &= (1 << (end - start + 1)) - 1;
 383
 384         for (irq = IRQ_EINT(start); irq <= IRQ_EINT(end); irq++) {
 385                 if (status & 1)
 386                         generic_handle_irq(irq);
 387
 388                 status >>= 1;
 389         }
 390 }
 391
 392 static void s3c_irq_demux_eint0_3(unsigned int irq, struct irq_desc *desc)
 393 {
 394         s3c_irq_demux_eint(0, 3);
 395 }
 396
 397 static void s3c_irq_demux_eint4_11(unsigned int irq, struct irq_desc *desc)
 398 {
 399         s3c_irq_demux_eint(4, 11);
 400 }
 401
 402 static void s3c_irq_demux_eint12_19(unsigned int irq, struct irq_desc *desc)
 403 {
 404         s3c_irq_demux_eint(12, 19);
 405 }
 406
 407 static void s3c_irq_demux_eint20_27(unsigned int irq, struct irq_desc *desc)
 408 {
 409         s3c_irq_demux_eint(20, 27);
 410 }
 411
 412 static int __init s3c64xx_init_irq_eint(void)
 413 {
 414         int irq;
 415
 416         /* On DT-enabled systems EINTs are handled by pinctrl-s3c64xx driver. */
 417         if (of_have_populated_dt())
 418                 return -ENODEV;
 419
 420         for (irq = IRQ_EINT(0); irq <= IRQ_EINT(27); irq++) {
 421                 irq_set_chip_and_handler(irq, &s3c_irq_eint, handle_level_irq);
 422                 irq_set_chip_data(irq, (void *)eint_irq_to_bit(irq));
 423                 irq_clear_status_flags(irq, IRQ_NOREQUEST);
 424         }
 425
 426         irq_set_chained_handler(IRQ_EINT0_3, s3c_irq_demux_eint0_3);
 427         irq_set_chained_handler(IRQ_EINT4_11, s3c_irq_demux_eint4_11);
 428         irq_set_chained_handler(IRQ_EINT12_19, s3c_irq_demux_eint12_19);
 429         irq_set_chained_handler(IRQ_EINT20_27, s3c_irq_demux_eint20_27);
 430
 431         return 0;
 432 }
 433 arch_initcall(s3c64xx_init_irq_eint);
 434
 435 void s3c64xx_restart(enum reboot_mode mode, const char *cmd)
 436 {
 437         if (mode != REBOOT_SOFT)
 438                 samsung_wdt_reset();
 439
 440         /* if all else fails, or mode was for soft, jump to 0 */
 441         soft_restart(0);
 442 }