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/amba/bus.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/io.h>
  19 #include <linux/cnt32_to_63.h>
  20 #include <linux/usb/musb.h>
  21
  22 #include <asm/irq.h>
  23 #include <mach/hardware.h>
  24 #include <mach/pm.h>
  25
  26 /*
  27  * This is the PKUnity sched_clock implementation.  This has
  28  * a resolution of 271ns, and a maximum value of 32025597s (370 days).
  29  *
  30  * The return value is guaranteed to be monotonic in that range as
  31  * long as there is always less than 582 seconds between successive
  32  * calls to this function.
  33  *
  34  *  ( * 1E9 / CLOCK_TICK_RATE ) -> about 2235/32
  35  */
  36 unsigned long long sched_clock(void)
  37 {
  38         unsigned long long v = cnt32_to_63(readl(OST_OSCR));
  39
  40         /* original conservative method, but overflow frequently
  41          * v *= NSEC_PER_SEC >> 12;
  42          * do_div(v, CLOCK_TICK_RATE >> 12);
  43          */
  44         v = ((v & 0x7fffffffffffffffULL) * 2235) >> 5;
  45
  46         return v;
  47 }
  48
  49 static struct resource puv3_usb_resources[] = {
  50         /* order is significant! */
  51         {
  52                 .start          = io_v2p(PKUNITY_USB_BASE),
  53                 .end            = io_v2p(PKUNITY_USB_BASE) + 0x3ff,
  54                 .flags          = IORESOURCE_MEM,
  55         }, {
  56                 .start          = IRQ_USB,
  57                 .flags          = IORESOURCE_IRQ,
  58         }, {
  59                 .start          = IRQ_USB,
  60                 .flags          = IORESOURCE_IRQ,
  61         },
  62 };
  63
  64 static struct musb_hdrc_config  puv3_usb_config[] = {
  65         {
  66                 .num_eps = 16,
  67                 .multipoint = 1,
  68 #ifdef CONFIG_USB_INVENTRA_DMA
  69                 .dma = 1,
  70                 .dma_channels = 8,
  71 #endif
  72         },
  73 };
  74
  75 static struct musb_hdrc_platform_data puv3_usb_plat = {
  76         .mode           = MUSB_HOST,
  77         .min_power      = 100,
  78         .clock          = 0,
  79         .config         = puv3_usb_config,
  80 };
  81
  82 static struct resource puv3_mmc_resources[] = {
  83         [0] = {
  84                 .start  = io_v2p(PKUNITY_SDC_BASE),
  85                 .end    = io_v2p(PKUNITY_SDC_BASE) + 0xfff,
  86                 .flags  = IORESOURCE_MEM,
  87         },
  88         [1] = {
  89                 .start  = IRQ_SDC,
  90                 .end    = IRQ_SDC,
  91                 .flags  = IORESOURCE_IRQ,
  92         },
  93 };
  94
  95 static struct resource puv3_unigfx_resources[] = {
  96         [0] = {
  97                 .start  = io_v2p(PKUNITY_UNIGFX_BASE),
  98                 .end    = io_v2p(PKUNITY_UNIGFX_BASE) + 0xfff,
  99                 .flags  = IORESOURCE_MEM,
 100         },
 101 };
 102
 103 static struct resource puv3_rtc_resources[] = {
 104         [0] = {
 105                 .start = io_v2p(PKUNITY_RTC_BASE),
 106                 .end   = io_v2p(PKUNITY_RTC_BASE) + 0xff,
 107                 .flags = IORESOURCE_MEM,
 108         },
 109         [1] = {
 110                 .start = IRQ_RTCAlarm,
 111                 .end   = IRQ_RTCAlarm,
 112                 .flags = IORESOURCE_IRQ,
 113         },
 114         [2] = {
 115                 .start = IRQ_RTC,
 116                 .end   = IRQ_RTC,
 117                 .flags = IORESOURCE_IRQ
 118         }
 119 };
 120
 121 static struct resource puv3_pwm_resources[] = {
 122         [0] = {
 123                 .start  = io_v2p(PKUNITY_OST_BASE) + 0x80,
 124                 .end    = io_v2p(PKUNITY_OST_BASE) + 0xff,
 125                 .flags  = IORESOURCE_MEM,
 126         },
 127 };
 128
 129 static struct resource puv3_uart0_resources[] = {
 130         [0] = {
 131                 .start = io_v2p(PKUNITY_UART0_BASE),
 132                 .end   = io_v2p(PKUNITY_UART0_BASE) + 0xff,
 133                 .flags = IORESOURCE_MEM,
 134         },
 135         [1] = {
 136                 .start = IRQ_UART0,
 137                 .end   = IRQ_UART0,
 138                 .flags = IORESOURCE_IRQ
 139         }
 140 };
 141
 142 static struct resource puv3_uart1_resources[] = {
 143         [0] = {
 144                 .start = io_v2p(PKUNITY_UART1_BASE),
 145                 .end   = io_v2p(PKUNITY_UART1_BASE) + 0xff,
 146                 .flags = IORESOURCE_MEM,
 147         },
 148         [1] = {
 149                 .start = IRQ_UART1,
 150                 .end   = IRQ_UART1,
 151                 .flags = IORESOURCE_IRQ
 152         }
 153 };
 154
 155 static struct resource puv3_umal_resources[] = {
 156         [0] = {
 157                 .start = io_v2p(PKUNITY_UMAL_BASE),
 158                 .end   = io_v2p(PKUNITY_UMAL_BASE) + 0x1fff,
 159                 .flags = IORESOURCE_MEM,
 160         },
 161         [1] = {
 162                 .start = IRQ_UMAL,
 163                 .end   = IRQ_UMAL,
 164                 .flags = IORESOURCE_IRQ
 165         }
 166 };
 167
 168 #ifdef CONFIG_PUV3_PM
 169
 170 #define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
 171 #define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]
 172
 173 /*
 174  * List of global PXA peripheral registers to preserve.
 175  * More ones like CP and general purpose register values are preserved
 176  * with the stack pointer in sleep.S.
 177  */
 178 enum {
 179         SLEEP_SAVE_PM_PLLDDRCFG,
 180         SLEEP_SAVE_COUNT
 181 };
 182
 183
 184 static void puv3_cpu_pm_save(unsigned long *sleep_save)
 185 {
 186 /*      SAVE(PM_PLLDDRCFG); */
 187 }
 188
 189 static void puv3_cpu_pm_restore(unsigned long *sleep_save)
 190 {
 191 /*      RESTORE(PM_PLLDDRCFG); */
 192 }
 193
 194 static int puv3_cpu_pm_prepare(void)
 195 {
 196         /* set resume return address */
 197         writel(virt_to_phys(puv3_cpu_resume), PM_DIVCFG);
 198         return 0;
 199 }
 200
 201 static void puv3_cpu_pm_enter(suspend_state_t state)
 202 {
 203         /* Clear reset status */
 204         writel(RESETC_RSSR_HWR | RESETC_RSSR_WDR
 205                         | RESETC_RSSR_SMR | RESETC_RSSR_SWR, RESETC_RSSR);
 206
 207         switch (state) {
 208 /*      case PM_SUSPEND_ON:
 209                 puv3_cpu_idle();
 210                 break; */
 211         case PM_SUSPEND_MEM:
 212                 puv3_cpu_pm_prepare();
 213                 puv3_cpu_suspend(PM_PMCR_SFB);
 214                 break;
 215         }
 216 }
 217
 218 static int puv3_cpu_pm_valid(suspend_state_t state)
 219 {
 220         return state == PM_SUSPEND_MEM;
 221 }
 222
 223 static void puv3_cpu_pm_finish(void)
 224 {
 225         /* ensure not to come back here if it wasn't intended */
 226         /* PSPR = 0; */
 227 }
 228
 229 static struct puv3_cpu_pm_fns puv3_cpu_pm_fnss = {
 230         .save_count     = SLEEP_SAVE_COUNT,
 231         .valid          = puv3_cpu_pm_valid,
 232         .save           = puv3_cpu_pm_save,
 233         .restore        = puv3_cpu_pm_restore,
 234         .enter          = puv3_cpu_pm_enter,
 235         .prepare        = puv3_cpu_pm_prepare,
 236         .finish         = puv3_cpu_pm_finish,
 237 };
 238
 239 static void __init puv3_init_pm(void)
 240 {
 241         puv3_cpu_pm_fns = &puv3_cpu_pm_fnss;
 242 }
 243 #else
 244 static inline void puv3_init_pm(void) {}
 245 #endif
 246
 247 void puv3_ps2_init(void)
 248 {
 249         struct clk *bclk32;
 250
 251         bclk32 = clk_get(NULL, "BUS32_CLK");
 252         writel(clk_get_rate(bclk32) / 200000, PS2_CNT); /* should > 5us */
 253 }
 254
 255 void __init puv3_core_init(void)
 256 {
 257         puv3_init_pm();
 258         puv3_ps2_init();
 259
 260         platform_device_register_simple("PKUnity-v3-RTC", -1,
 261                         puv3_rtc_resources, ARRAY_SIZE(puv3_rtc_resources));
 262         platform_device_register_simple("PKUnity-v3-UMAL", -1,
 263                         puv3_umal_resources, ARRAY_SIZE(puv3_umal_resources));
 264         platform_device_register_simple("PKUnity-v3-MMC", -1,
 265                         puv3_mmc_resources, ARRAY_SIZE(puv3_mmc_resources));
 266         platform_device_register_simple("PKUnity-v3-UNIGFX", -1,
 267                         puv3_unigfx_resources, ARRAY_SIZE(puv3_unigfx_resources));
 268         platform_device_register_simple("PKUnity-v3-PWM", -1,
 269                         puv3_pwm_resources, ARRAY_SIZE(puv3_pwm_resources));
 270         platform_device_register_simple("PKUnity-v3-UART", 0,
 271                         puv3_uart0_resources, ARRAY_SIZE(puv3_uart0_resources));
 272         platform_device_register_simple("PKUnity-v3-UART", 1,
 273                         puv3_uart1_resources, ARRAY_SIZE(puv3_uart1_resources));
 274         platform_device_register_simple("PKUnity-v3-AC97", -1, NULL, 0);
 275         platform_device_register_resndata(&platform_bus, "musb_hdrc", -1,
 276                         puv3_usb_resources, ARRAY_SIZE(puv3_usb_resources),
 277                         &puv3_usb_plat, sizeof(puv3_usb_plat));
 278 }
 279