arch/unicore32/kernel/puv3-core.c

   1 /*
   2  *  linux/arch/unicore32/kernel/puv3-core.c
   3  *
   4  * Code specific to PKUnity SoC and UniCore ISA
   5  *
   6  *      Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
   7  *      Copyright (C) 2001-2010 Guan Xuetao
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/device.h>
  16 #include <linux/sysdev.h>
  17 #include <linux/amba/bus.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/io.h>
  20 #include <linux/cnt32_to_63.h>
  21 #include <linux/usb/musb.h>
  22
  23 #include <asm/irq.h>
  24 #include <mach/hardware.h>
  25 #include <mach/pm.h>
  26
  27 /*
  28  * This is the PKUnity sched_clock implementation.  This has
  29  * a resolution of 271ns, and a maximum value of 32025597s (370 days).
  30  *
  31  * The return value is guaranteed to be monotonic in that range as
  32  * long as there is always less than 582 seconds between successive
  33  * calls to this function.
  34  *
  35  *  ( * 1E9 / CLOCK_TICK_RATE ) -> about 2235/32
  36  */
  37 unsigned long long sched_clock(void)
  38 {
  39         unsigned long long v = cnt32_to_63(OST_OSCR);
  40
  41         /* original conservative method, but overflow frequently
  42          * v *= NSEC_PER_SEC >> 12;
  43          * do_div(v, CLOCK_TICK_RATE >> 12);
  44          */
  45         v = ((v & 0x7fffffffffffffffULL) * 2235) >> 5;
  46
  47         return v;
  48 }
  49
  50 static struct resource puv3_usb_resources[] = {
  51         /* order is significant! */
  52         {
  53                 .start          = PKUNITY_USB_BASE,
  54                 .end            = PKUNITY_USB_BASE + 0x3ff,
  55                 .flags          = IORESOURCE_MEM,
  56         }, {
  57                 .start          = IRQ_USB,
  58                 .flags          = IORESOURCE_IRQ,
  59         }, {
  60                 .start          = IRQ_USB,
  61                 .flags          = IORESOURCE_IRQ,
  62         },
  63 };
  64
  65 static struct musb_hdrc_config  puv3_usb_config[] = {
  66         {
  67                 .num_eps = 16,
  68                 .multipoint = 1,
  69 #ifdef CONFIG_USB_INVENTRA_DMA
  70                 .dma = 1,
  71                 .dma_channels = 8,
  72 #endif
  73         },
  74 };
  75
  76 static struct musb_hdrc_platform_data puv3_usb_plat = {
  77         .mode           = MUSB_HOST,
  78         .min_power      = 100,
  79         .clock          = 0,
  80         .config         = puv3_usb_config,
  81 };
  82
  83 static struct resource puv3_mmc_resources[] = {
  84         [0] = {
  85                 .start  = PKUNITY_SDC_BASE,
  86                 .end    = PKUNITY_SDC_BASE + 0xfff,
  87                 .flags  = IORESOURCE_MEM,
  88         },
  89         [1] = {
  90                 .start  = IRQ_SDC,
  91                 .end    = IRQ_SDC,
  92                 .flags  = IORESOURCE_IRQ,
  93         },
  94 };
  95
  96 static struct resource puv3_rtc_resources[] = {
  97         [0] = {
  98                 .start = PKUNITY_RTC_BASE,
  99                 .end   = PKUNITY_RTC_BASE + 0xff,
 100                 .flags = IORESOURCE_MEM,
 101         },
 102         [1] = {
 103                 .start = IRQ_RTCAlarm,
 104                 .end   = IRQ_RTCAlarm,
 105                 .flags = IORESOURCE_IRQ,
 106         },
 107         [2] = {
 108                 .start = IRQ_RTC,
 109                 .end   = IRQ_RTC,
 110                 .flags = IORESOURCE_IRQ
 111         }
 112 };
 113
 114 static struct resource puv3_pwm_resources[] = {
 115         [0] = {
 116                 .start  = PKUNITY_OST_BASE + 0x80,
 117                 .end    = PKUNITY_OST_BASE + 0xff,
 118                 .flags  = IORESOURCE_MEM,
 119         },
 120 };
 121
 122 static struct resource puv3_uart0_resources[] = {
 123         [0] = {
 124                 .start = PKUNITY_UART0_BASE,
 125                 .end   = PKUNITY_UART0_BASE + 0xff,
 126                 .flags = IORESOURCE_MEM,
 127         },
 128         [1] = {
 129                 .start = IRQ_UART0,
 130                 .end   = IRQ_UART0,
 131                 .flags = IORESOURCE_IRQ
 132         }
 133 };
 134
 135 static struct resource puv3_uart1_resources[] = {
 136         [0] = {
 137                 .start = PKUNITY_UART1_BASE,
 138                 .end   = PKUNITY_UART1_BASE + 0xff,
 139                 .flags = IORESOURCE_MEM,
 140         },
 141         [1] = {
 142                 .start = IRQ_UART1,
 143                 .end   = IRQ_UART1,
 144                 .flags = IORESOURCE_IRQ
 145         }
 146 };
 147
 148 static struct resource puv3_umal_resources[] = {
 149         [0] = {
 150                 .start = PKUNITY_UMAL_BASE,
 151                 .end   = PKUNITY_UMAL_BASE + 0x1fff,
 152                 .flags = IORESOURCE_MEM,
 153         },
 154         [1] = {
 155                 .start = IRQ_UMAL,
 156                 .end   = IRQ_UMAL,
 157                 .flags = IORESOURCE_IRQ
 158         }
 159 };
 160
 161 #ifdef CONFIG_PUV3_PM
 162
 163 #define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
 164 #define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]
 165
 166 /*
 167  * List of global PXA peripheral registers to preserve.
 168  * More ones like CP and general purpose register values are preserved
 169  * with the stack pointer in sleep.S.
 170  */
 171 enum {
 172         SLEEP_SAVE_PM_PLLDDRCFG,
 173         SLEEP_SAVE_COUNT
 174 };
 175
 176
 177 static void puv3_cpu_pm_save(unsigned long *sleep_save)
 178 {
 179 /*      SAVE(PM_PLLDDRCFG); */
 180 }
 181
 182 static void puv3_cpu_pm_restore(unsigned long *sleep_save)
 183 {
 184 /*      RESTORE(PM_PLLDDRCFG); */
 185 }
 186
 187 static int puv3_cpu_pm_prepare(void)
 188 {
 189         /* set resume return address */
 190         PM_DIVCFG = virt_to_phys(puv3_cpu_resume);
 191         return 0;
 192 }
 193
 194 static void puv3_cpu_pm_enter(suspend_state_t state)
 195 {
 196         /* Clear reset status */
 197         RESETC_RSSR = RESETC_RSSR_HWR | RESETC_RSSR_WDR
 198                         | RESETC_RSSR_SMR | RESETC_RSSR_SWR;
 199
 200         switch (state) {
 201 /*      case PM_SUSPEND_ON:
 202                 puv3_cpu_idle();
 203                 break; */
 204         case PM_SUSPEND_MEM:
 205                 puv3_cpu_pm_prepare();
 206                 puv3_cpu_suspend(PM_PMCR_SFB);
 207                 break;
 208         }
 209 }
 210
 211 static int puv3_cpu_pm_valid(suspend_state_t state)
 212 {
 213         return state == PM_SUSPEND_MEM;
 214 }
 215
 216 static void puv3_cpu_pm_finish(void)
 217 {
 218         /* ensure not to come back here if it wasn't intended */
 219         /* PSPR = 0; */
 220 }
 221
 222 static struct puv3_cpu_pm_fns puv3_cpu_pm_fnss = {
 223         .save_count     = SLEEP_SAVE_COUNT,
 224         .valid          = puv3_cpu_pm_valid,
 225         .save           = puv3_cpu_pm_save,
 226         .restore        = puv3_cpu_pm_restore,
 227         .enter          = puv3_cpu_pm_enter,
 228         .prepare        = puv3_cpu_pm_prepare,
 229         .finish         = puv3_cpu_pm_finish,
 230 };
 231
 232 static void __init puv3_init_pm(void)
 233 {
 234         puv3_cpu_pm_fns = &puv3_cpu_pm_fnss;
 235 }
 236 #else
 237 static inline void puv3_init_pm(void) {}
 238 #endif
 239
 240 void puv3_ps2_init(void)
 241 {
 242         struct clk *bclk32;
 243
 244         bclk32 = clk_get(NULL, "BUS32_CLK");
 245         PS2_CNT = clk_get_rate(bclk32) / 200000; /* should > 5us */
 246 }
 247
 248 void __init puv3_core_init(void)
 249 {
 250         puv3_init_pm();
 251         puv3_ps2_init();
 252
 253         platform_device_register_simple("PKUnity-v3-RTC", -1,
 254                         puv3_rtc_resources, ARRAY_SIZE(puv3_rtc_resources));
 255         platform_device_register_simple("PKUnity-v3-UMAL", -1,
 256                         puv3_umal_resources, ARRAY_SIZE(puv3_umal_resources));
 257         platform_device_register_simple("PKUnity-v3-MMC", -1,
 258                         puv3_mmc_resources, ARRAY_SIZE(puv3_mmc_resources));
 259         platform_device_register_simple("PKUnity-v3-PWM", -1,
 260                         puv3_pwm_resources, ARRAY_SIZE(puv3_pwm_resources));
 261         platform_device_register_simple("PKUnity-v3-UART", 0,
 262                         puv3_uart0_resources, ARRAY_SIZE(puv3_uart0_resources));
 263         platform_device_register_simple("PKUnity-v3-UART", 1,
 264                         puv3_uart1_resources, ARRAY_SIZE(puv3_uart1_resources));
 265         platform_device_register_simple("PKUnity-v3-AC97", -1, NULL, 0);
 266         platform_device_register_resndata(&platform_bus, "musb_hdrc", -1,
 267                         puv3_usb_resources, ARRAY_SIZE(puv3_usb_resources),
 268                         &puv3_usb_plat, sizeof(puv3_usb_plat));
 269 }
 270