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 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/ioport.h>
  22 #include <linux/serial_core.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/io.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/irq.h>
  27 #include <linux/gpio.h>
  28
  29 #include <asm/mach/arch.h>
  30 #include <asm/mach/map.h>
  31 #include <asm/hardware/vic.h>
  32 #include <asm/system_misc.h>
  33
  34 #include <mach/map.h>
  35 #include <mach/hardware.h>
  36 #include <mach/regs-gpio.h>
  37
  38 #include <plat/cpu.h>
  39 #include <plat/clock.h>
  40 #include <plat/devs.h>
  41 #include <plat/pm.h>
  42 #include <plat/gpio-cfg.h>
  43 #include <plat/irq-uart.h>
  44 #include <plat/irq-vic-timer.h>
  45 #include <plat/regs-irqtype.h>
  46 #include <plat/regs-serial.h>
  47 #include <plat/watchdog-reset.h>
  48
  49 #include "common.h"
  50
  51 /* uart registration process */
  52
  53 static void __init s3c64xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  54 {
  55         s3c24xx_init_uartdevs("s3c6400-uart", s3c64xx_uart_resources, cfg, no);
  56 }
  57
  58 /* table of supported CPUs */
  59
  60 static const char name_s3c6400[] = "S3C6400";
  61 static const char name_s3c6410[] = "S3C6410";
  62
  63 static struct cpu_table cpu_ids[] __initdata = {
  64         {
  65                 .idcode         = S3C6400_CPU_ID,
  66                 .idmask         = S3C64XX_CPU_MASK,
  67                 .map_io         = s3c6400_map_io,
  68                 .init_clocks    = s3c6400_init_clocks,
  69                 .init_uarts     = s3c64xx_init_uarts,
  70                 .init           = s3c6400_init,
  71                 .name           = name_s3c6400,
  72         }, {
  73                 .idcode         = S3C6410_CPU_ID,
  74                 .idmask         = S3C64XX_CPU_MASK,
  75                 .map_io         = s3c6410_map_io,
  76                 .init_clocks    = s3c6410_init_clocks,
  77                 .init_uarts     = s3c64xx_init_uarts,
  78                 .init           = s3c6410_init,
  79                 .name           = name_s3c6410,
  80         },
  81 };
  82
  83 /* minimal IO mapping */
  84
  85 /* see notes on uart map in arch/arm/mach-s3c64xx/include/mach/debug-macro.S */
  86 #define UART_OFFS (S3C_PA_UART & 0xfffff)
  87
  88 static struct map_desc s3c_iodesc[] __initdata = {
  89         {
  90                 .virtual        = (unsigned long)S3C_VA_SYS,
  91                 .pfn            = __phys_to_pfn(S3C64XX_PA_SYSCON),
  92                 .length         = SZ_4K,
  93                 .type           = MT_DEVICE,
  94         }, {
  95                 .virtual        = (unsigned long)S3C_VA_MEM,
  96                 .pfn            = __phys_to_pfn(S3C64XX_PA_SROM),
  97                 .length         = SZ_4K,
  98                 .type           = MT_DEVICE,
  99         }, {
 100                 .virtual        = (unsigned long)(S3C_VA_UART + UART_OFFS),
 101                 .pfn            = __phys_to_pfn(S3C_PA_UART),
 102                 .length         = SZ_4K,
 103                 .type           = MT_DEVICE,
 104         }, {
 105                 .virtual        = (unsigned long)VA_VIC0,
 106                 .pfn            = __phys_to_pfn(S3C64XX_PA_VIC0),
 107                 .length         = SZ_16K,
 108                 .type           = MT_DEVICE,
 109         }, {
 110                 .virtual        = (unsigned long)VA_VIC1,
 111                 .pfn            = __phys_to_pfn(S3C64XX_PA_VIC1),
 112                 .length         = SZ_16K,
 113                 .type           = MT_DEVICE,
 114         }, {
 115                 .virtual        = (unsigned long)S3C_VA_TIMER,
 116                 .pfn            = __phys_to_pfn(S3C_PA_TIMER),
 117                 .length         = SZ_16K,
 118                 .type           = MT_DEVICE,
 119         }, {
 120                 .virtual        = (unsigned long)S3C64XX_VA_GPIO,
 121                 .pfn            = __phys_to_pfn(S3C64XX_PA_GPIO),
 122                 .length         = SZ_4K,
 123                 .type           = MT_DEVICE,
 124         }, {
 125                 .virtual        = (unsigned long)S3C64XX_VA_MODEM,
 126                 .pfn            = __phys_to_pfn(S3C64XX_PA_MODEM),
 127                 .length         = SZ_4K,
 128                 .type           = MT_DEVICE,
 129         }, {
 130                 .virtual        = (unsigned long)S3C_VA_WATCHDOG,
 131                 .pfn            = __phys_to_pfn(S3C64XX_PA_WATCHDOG),
 132                 .length         = SZ_4K,
 133                 .type           = MT_DEVICE,
 134         }, {
 135                 .virtual        = (unsigned long)S3C_VA_USB_HSPHY,
 136                 .pfn            = __phys_to_pfn(S3C64XX_PA_USB_HSPHY),
 137                 .length         = SZ_1K,
 138                 .type           = MT_DEVICE,
 139         },
 140 };
 141
 142 static struct bus_type s3c64xx_subsys = {
 143         .name           = "s3c64xx-core",
 144         .dev_name       = "s3c64xx-core",
 145 };
 146
 147 static struct device s3c64xx_dev = {
 148         .bus    = &s3c64xx_subsys,
 149 };
 150
 151 /* read cpu identification code */
 152
 153 void __init s3c64xx_init_io(struct map_desc *mach_desc, int size)
 154 {
 155         /* initialise the io descriptors we need for initialisation */
 156         iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
 157         iotable_init(mach_desc, size);
 158         init_consistent_dma_size(SZ_8M);
 159
 160         /* detect cpu id */
 161         s3c64xx_init_cpu();
 162
 163         s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids));
 164 }
 165
 166 static __init int s3c64xx_dev_init(void)
 167 {
 168         subsys_system_register(&s3c64xx_subsys, NULL);
 169         return device_register(&s3c64xx_dev);
 170 }
 171 core_initcall(s3c64xx_dev_init);
 172
 173 /*
 174  * setup the sources the vic should advertise resume
 175  * for, even though it is not doing the wake
 176  * (set_irq_wake needs to be valid)
 177  */
 178 #define IRQ_VIC0_RESUME (1 << (IRQ_RTC_TIC - IRQ_VIC0_BASE))
 179 #define IRQ_VIC1_RESUME (1 << (IRQ_RTC_ALARM - IRQ_VIC1_BASE) | \
 180                          1 << (IRQ_PENDN - IRQ_VIC1_BASE) |     \
 181                          1 << (IRQ_HSMMC0 - IRQ_VIC1_BASE) |    \
 182                          1 << (IRQ_HSMMC1 - IRQ_VIC1_BASE) |    \
 183                          1 << (IRQ_HSMMC2 - IRQ_VIC1_BASE))
 184
 185 void __init s3c64xx_init_irq(u32 vic0_valid, u32 vic1_valid)
 186 {
 187         printk(KERN_DEBUG "%s: initialising interrupts\n", __func__);
 188
 189         /* initialise the pair of VICs */
 190         vic_init(VA_VIC0, IRQ_VIC0_BASE, vic0_valid, IRQ_VIC0_RESUME);
 191         vic_init(VA_VIC1, IRQ_VIC1_BASE, vic1_valid, IRQ_VIC1_RESUME);
 192
 193         /* add the timer sub-irqs */
 194         s3c_init_vic_timer_irq(5, IRQ_TIMER0);
 195 }
 196
 197 #define eint_offset(irq)        ((irq) - IRQ_EINT(0))
 198 #define eint_irq_to_bit(irq)    ((u32)(1 << eint_offset(irq)))
 199
 200 static inline void s3c_irq_eint_mask(struct irq_data *data)
 201 {
 202         u32 mask;
 203
 204         mask = __raw_readl(S3C64XX_EINT0MASK);
 205         mask |= (u32)data->chip_data;
 206         __raw_writel(mask, S3C64XX_EINT0MASK);
 207 }
 208
 209 static void s3c_irq_eint_unmask(struct irq_data *data)
 210 {
 211         u32 mask;
 212
 213         mask = __raw_readl(S3C64XX_EINT0MASK);
 214         mask &= ~((u32)data->chip_data);
 215         __raw_writel(mask, S3C64XX_EINT0MASK);
 216 }
 217
 218 static inline void s3c_irq_eint_ack(struct irq_data *data)
 219 {
 220         __raw_writel((u32)data->chip_data, S3C64XX_EINT0PEND);
 221 }
 222
 223 static void s3c_irq_eint_maskack(struct irq_data *data)
 224 {
 225         /* compiler should in-line these */
 226         s3c_irq_eint_mask(data);
 227         s3c_irq_eint_ack(data);
 228 }
 229
 230 static int s3c_irq_eint_set_type(struct irq_data *data, unsigned int type)
 231 {
 232         int offs = eint_offset(data->irq);
 233         int pin, pin_val;
 234         int shift;
 235         u32 ctrl, mask;
 236         u32 newvalue = 0;
 237         void __iomem *reg;
 238
 239         if (offs > 27)
 240                 return -EINVAL;
 241
 242         if (offs <= 15)
 243                 reg = S3C64XX_EINT0CON0;
 244         else
 245                 reg = S3C64XX_EINT0CON1;
 246
 247         switch (type) {
 248         case IRQ_TYPE_NONE:
 249                 printk(KERN_WARNING "No edge setting!\n");
 250                 break;
 251
 252         case IRQ_TYPE_EDGE_RISING:
 253                 newvalue = S3C2410_EXTINT_RISEEDGE;
 254                 break;
 255
 256         case IRQ_TYPE_EDGE_FALLING:
 257                 newvalue = S3C2410_EXTINT_FALLEDGE;
 258                 break;
 259
 260         case IRQ_TYPE_EDGE_BOTH:
 261                 newvalue = S3C2410_EXTINT_BOTHEDGE;
 262                 break;
 263
 264         case IRQ_TYPE_LEVEL_LOW:
 265                 newvalue = S3C2410_EXTINT_LOWLEV;
 266                 break;
 267
 268         case IRQ_TYPE_LEVEL_HIGH:
 269                 newvalue = S3C2410_EXTINT_HILEV;
 270                 break;
 271
 272         default:
 273                 printk(KERN_ERR "No such irq type %d", type);
 274                 return -1;
 275         }
 276
 277         if (offs <= 15)
 278                 shift = (offs / 2) * 4;
 279         else
 280                 shift = ((offs - 16) / 2) * 4;
 281         mask = 0x7 << shift;
 282
 283         ctrl = __raw_readl(reg);
 284         ctrl &= ~mask;
 285         ctrl |= newvalue << shift;
 286         __raw_writel(ctrl, reg);
 287
 288         /* set the GPIO pin appropriately */
 289
 290         if (offs < 16) {
 291                 pin = S3C64XX_GPN(offs);
 292                 pin_val = S3C_GPIO_SFN(2);
 293         } else if (offs < 23) {
 294                 pin = S3C64XX_GPL(offs + 8 - 16);
 295                 pin_val = S3C_GPIO_SFN(3);
 296         } else {
 297                 pin = S3C64XX_GPM(offs - 23);
 298                 pin_val = S3C_GPIO_SFN(3);
 299         }
 300
 301         s3c_gpio_cfgpin(pin, pin_val);
 302
 303         return 0;
 304 }
 305
 306 static struct irq_chip s3c_irq_eint = {
 307         .name           = "s3c-eint",
 308         .irq_mask       = s3c_irq_eint_mask,
 309         .irq_unmask     = s3c_irq_eint_unmask,
 310         .irq_mask_ack   = s3c_irq_eint_maskack,
 311         .irq_ack        = s3c_irq_eint_ack,
 312         .irq_set_type   = s3c_irq_eint_set_type,
 313         .irq_set_wake   = s3c_irqext_wake,
 314 };
 315
 316 /* s3c_irq_demux_eint
 317  *
 318  * This function demuxes the IRQ from the group0 external interrupts,
 319  * from IRQ_EINT(0) to IRQ_EINT(27). It is designed to be inlined into
 320  * the specific handlers s3c_irq_demux_eintX_Y.
 321  */
 322 static inline void s3c_irq_demux_eint(unsigned int start, unsigned int end)
 323 {
 324         u32 status = __raw_readl(S3C64XX_EINT0PEND);
 325         u32 mask = __raw_readl(S3C64XX_EINT0MASK);
 326         unsigned int irq;
 327
 328         status &= ~mask;
 329         status >>= start;
 330         status &= (1 << (end - start + 1)) - 1;
 331
 332         for (irq = IRQ_EINT(start); irq <= IRQ_EINT(end); irq++) {
 333                 if (status & 1)
 334                         generic_handle_irq(irq);
 335
 336                 status >>= 1;
 337         }
 338 }
 339
 340 static void s3c_irq_demux_eint0_3(unsigned int irq, struct irq_desc *desc)
 341 {
 342         s3c_irq_demux_eint(0, 3);
 343 }
 344
 345 static void s3c_irq_demux_eint4_11(unsigned int irq, struct irq_desc *desc)
 346 {
 347         s3c_irq_demux_eint(4, 11);
 348 }
 349
 350 static void s3c_irq_demux_eint12_19(unsigned int irq, struct irq_desc *desc)
 351 {
 352         s3c_irq_demux_eint(12, 19);
 353 }
 354
 355 static void s3c_irq_demux_eint20_27(unsigned int irq, struct irq_desc *desc)
 356 {
 357         s3c_irq_demux_eint(20, 27);
 358 }
 359
 360 static int __init s3c64xx_init_irq_eint(void)
 361 {
 362         int irq;
 363
 364         for (irq = IRQ_EINT(0); irq <= IRQ_EINT(27); irq++) {
 365                 irq_set_chip_and_handler(irq, &s3c_irq_eint, handle_level_irq);
 366                 irq_set_chip_data(irq, (void *)eint_irq_to_bit(irq));
 367                 set_irq_flags(irq, IRQF_VALID);
 368         }
 369
 370         irq_set_chained_handler(IRQ_EINT0_3, s3c_irq_demux_eint0_3);
 371         irq_set_chained_handler(IRQ_EINT4_11, s3c_irq_demux_eint4_11);
 372         irq_set_chained_handler(IRQ_EINT12_19, s3c_irq_demux_eint12_19);
 373         irq_set_chained_handler(IRQ_EINT20_27, s3c_irq_demux_eint20_27);
 374
 375         return 0;
 376 }
 377 arch_initcall(s3c64xx_init_irq_eint);
 378
 379 void s3c64xx_restart(char mode, const char *cmd)
 380 {
 381         if (mode != 's')
 382                 arch_wdt_reset();
 383
 384         /* if all else fails, or mode was for soft, jump to 0 */
 385         soft_restart(0);
 386 }