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