arch/arm/mach-w90x900/cpu.c

   1 /*
   2  * linux/arch/arm/mach-w90x900/cpu.c
   3  *
   4  * Copyright (c) 2009 Nuvoton corporation.
   5  *
   6  * Wan ZongShun <mcuos.com@gmail.com>
   7  *
   8  * NUC900 series cpu common support
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation;version 2 of the License.
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/types.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/list.h>
  20 #include <linux/timer.h>
  21 #include <linux/init.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/io.h>
  24 #include <linux/serial_8250.h>
  25 #include <linux/delay.h>
  26
  27 #include <asm/mach/arch.h>
  28 #include <asm/mach/map.h>
  29 #include <asm/mach/irq.h>
  30 #include <asm/irq.h>
  31 #include <asm/system_misc.h>
  32
  33 #include <mach/hardware.h>
  34 #include <mach/regs-serial.h>
  35 #include <mach/regs-clock.h>
  36 #include <mach/regs-ebi.h>
  37 #include <mach/regs-timer.h>
  38
  39 #include "cpu.h"
  40 #include "clock.h"
  41 #include "nuc9xx.h"
  42
  43 /* Initial IO mappings */
  44
  45 static struct map_desc nuc900_iodesc[] __initdata = {
  46         IODESC_ENT(IRQ),
  47         IODESC_ENT(GCR),
  48         IODESC_ENT(UART),
  49         IODESC_ENT(TIMER),
  50         IODESC_ENT(EBI),
  51         IODESC_ENT(GPIO),
  52 };
  53
  54 /* Initial clock declarations. */
  55 static DEFINE_CLK(lcd, 0);
  56 static DEFINE_CLK(audio, 1);
  57 static DEFINE_CLK(fmi, 4);
  58 static DEFINE_SUBCLK(ms, 0);
  59 static DEFINE_SUBCLK(sd, 1);
  60 static DEFINE_CLK(dmac, 5);
  61 static DEFINE_CLK(atapi, 6);
  62 static DEFINE_CLK(emc, 7);
  63 static DEFINE_SUBCLK(rmii, 2);
  64 static DEFINE_CLK(usbd, 8);
  65 static DEFINE_CLK(usbh, 9);
  66 static DEFINE_CLK(g2d, 10);
  67 static DEFINE_CLK(pwm, 18);
  68 static DEFINE_CLK(ps2, 24);
  69 static DEFINE_CLK(kpi, 25);
  70 static DEFINE_CLK(wdt, 26);
  71 static DEFINE_CLK(gdma, 27);
  72 static DEFINE_CLK(adc, 28);
  73 static DEFINE_CLK(usi, 29);
  74 static DEFINE_CLK(ext, 0);
  75 static DEFINE_CLK(timer0, 19);
  76 static DEFINE_CLK(timer1, 20);
  77 static DEFINE_CLK(timer2, 21);
  78 static DEFINE_CLK(timer3, 22);
  79 static DEFINE_CLK(timer4, 23);
  80
  81 static struct clk_lookup nuc900_clkregs[] = {
  82         DEF_CLKLOOK(&clk_lcd, "nuc900-lcd", NULL),
  83         DEF_CLKLOOK(&clk_audio, "nuc900-ac97", NULL),
  84         DEF_CLKLOOK(&clk_fmi, "nuc900-fmi", NULL),
  85         DEF_CLKLOOK(&clk_ms, "nuc900-fmi", "MS"),
  86         DEF_CLKLOOK(&clk_sd, "nuc900-fmi", "SD"),
  87         DEF_CLKLOOK(&clk_dmac, "nuc900-dmac", NULL),
  88         DEF_CLKLOOK(&clk_atapi, "nuc900-atapi", NULL),
  89         DEF_CLKLOOK(&clk_emc, "nuc900-emc", NULL),
  90         DEF_CLKLOOK(&clk_rmii, "nuc900-emc", "RMII"),
  91         DEF_CLKLOOK(&clk_usbd, "nuc900-usbd", NULL),
  92         DEF_CLKLOOK(&clk_usbh, "nuc900-usbh", NULL),
  93         DEF_CLKLOOK(&clk_g2d, "nuc900-g2d", NULL),
  94         DEF_CLKLOOK(&clk_pwm, "nuc900-pwm", NULL),
  95         DEF_CLKLOOK(&clk_ps2, "nuc900-ps2", NULL),
  96         DEF_CLKLOOK(&clk_kpi, "nuc900-kpi", NULL),
  97         DEF_CLKLOOK(&clk_wdt, "nuc900-wdt", NULL),
  98         DEF_CLKLOOK(&clk_gdma, "nuc900-gdma", NULL),
  99         DEF_CLKLOOK(&clk_adc, "nuc900-ts", NULL),
 100         DEF_CLKLOOK(&clk_usi, "nuc900-spi", NULL),
 101         DEF_CLKLOOK(&clk_ext, NULL, "ext"),
 102         DEF_CLKLOOK(&clk_timer0, NULL, "timer0"),
 103         DEF_CLKLOOK(&clk_timer1, NULL, "timer1"),
 104         DEF_CLKLOOK(&clk_timer2, NULL, "timer2"),
 105         DEF_CLKLOOK(&clk_timer3, NULL, "timer3"),
 106         DEF_CLKLOOK(&clk_timer4, NULL, "timer4"),
 107 };
 108
 109 /* Initial serial platform data */
 110
 111 struct plat_serial8250_port nuc900_uart_data[] = {
 112         NUC900_8250PORT(UART0),
 113         {},
 114 };
 115
 116 struct platform_device nuc900_serial_device = {
 117         .name                   = "serial8250",
 118         .id                     = PLAT8250_DEV_PLATFORM,
 119         .dev                    = {
 120                 .platform_data  = nuc900_uart_data,
 121         },
 122 };
 123
 124 /*Set NUC900 series cpu frequence*/
 125 static int __init nuc900_set_clkval(unsigned int cpufreq)
 126 {
 127         unsigned int pllclk, ahbclk, apbclk, val;
 128
 129         pllclk = 0;
 130         ahbclk = 0;
 131         apbclk = 0;
 132
 133         switch (cpufreq) {
 134         case 66:
 135                 pllclk = PLL_66MHZ;
 136                 ahbclk = AHB_CPUCLK_1_1;
 137                 apbclk = APB_AHB_1_2;
 138                 break;
 139
 140         case 100:
 141                 pllclk = PLL_100MHZ;
 142                 ahbclk = AHB_CPUCLK_1_1;
 143                 apbclk = APB_AHB_1_2;
 144                 break;
 145
 146         case 120:
 147                 pllclk = PLL_120MHZ;
 148                 ahbclk = AHB_CPUCLK_1_2;
 149                 apbclk = APB_AHB_1_2;
 150                 break;
 151
 152         case 166:
 153                 pllclk = PLL_166MHZ;
 154                 ahbclk = AHB_CPUCLK_1_2;
 155                 apbclk = APB_AHB_1_2;
 156                 break;
 157
 158         case 200:
 159                 pllclk = PLL_200MHZ;
 160                 ahbclk = AHB_CPUCLK_1_2;
 161                 apbclk = APB_AHB_1_2;
 162                 break;
 163         }
 164
 165         __raw_writel(pllclk, REG_PLLCON0);
 166
 167         val = __raw_readl(REG_CLKDIV);
 168         val &= ~(0x03 << 24 | 0x03 << 26);
 169         val |= (ahbclk << 24 | apbclk << 26);
 170         __raw_writel(val, REG_CLKDIV);
 171
 172         return  0;
 173 }
 174 static int __init nuc900_set_cpufreq(char *str)
 175 {
 176         unsigned long cpufreq, val;
 177
 178         if (!*str)
 179                 return 0;
 180
 181         if (kstrtoul(str, 0, &cpufreq))
 182                 return 0;
 183
 184         nuc900_clock_source(NULL, "ext");
 185
 186         nuc900_set_clkval(cpufreq);
 187
 188         mdelay(1);
 189
 190         val = __raw_readl(REG_CKSKEW);
 191         val &= ~0xff;
 192         val |= DEFAULTSKEW;
 193         __raw_writel(val, REG_CKSKEW);
 194
 195         nuc900_clock_source(NULL, "pll0");
 196
 197         return 1;
 198 }
 199
 200 __setup("cpufreq=", nuc900_set_cpufreq);
 201
 202 /*Init NUC900 evb io*/
 203
 204 void __init nuc900_map_io(struct map_desc *mach_desc, int mach_size)
 205 {
 206         unsigned long idcode = 0x0;
 207
 208         iotable_init(mach_desc, mach_size);
 209         iotable_init(nuc900_iodesc, ARRAY_SIZE(nuc900_iodesc));
 210
 211         idcode = __raw_readl(NUC900PDID);
 212         if (idcode == NUC910_CPUID)
 213                 printk(KERN_INFO "CPU type 0x%08lx is NUC910\n", idcode);
 214         else if (idcode == NUC920_CPUID)
 215                 printk(KERN_INFO "CPU type 0x%08lx is NUC920\n", idcode);
 216         else if (idcode == NUC950_CPUID)
 217                 printk(KERN_INFO "CPU type 0x%08lx is NUC950\n", idcode);
 218         else if (idcode == NUC960_CPUID)
 219                 printk(KERN_INFO "CPU type 0x%08lx is NUC960\n", idcode);
 220 }
 221
 222 /*Init NUC900 clock*/
 223
 224 void __init nuc900_init_clocks(void)
 225 {
 226         clkdev_add_table(nuc900_clkregs, ARRAY_SIZE(nuc900_clkregs));
 227 }
 228
 229 #define WTCR    (TMR_BA + 0x1C)
 230 #define WTCLK   (1 << 10)
 231 #define WTE     (1 << 7)
 232 #define WTRE    (1 << 1)
 233
 234 void nuc9xx_restart(enum reboot_mode mode, const char *cmd)
 235 {
 236         if (mode == REBOOT_SOFT) {
 237                 /* Jump into ROM at address 0 */
 238                 soft_restart(0);
 239         } else {
 240                 __raw_writel(WTE | WTRE | WTCLK, WTCR);
 241         }
 242 }