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
  32 #include <mach/hardware.h>
  33 #include <mach/regs-serial.h>
  34 #include <mach/regs-clock.h>
  35 #include <mach/regs-ebi.h>
  36
  37 #include "cpu.h"
  38 #include "clock.h"
  39
  40 /* Initial IO mappings */
  41
  42 static struct map_desc nuc900_iodesc[] __initdata = {
  43         IODESC_ENT(IRQ),
  44         IODESC_ENT(GCR),
  45         IODESC_ENT(UART),
  46         IODESC_ENT(TIMER),
  47         IODESC_ENT(EBI),
  48 };
  49
  50 /* Initial clock declarations. */
  51 static DEFINE_CLK(lcd, 0);
  52 static DEFINE_CLK(audio, 1);
  53 static DEFINE_CLK(fmi, 4);
  54 static DEFINE_SUBCLK(ms, 0);
  55 static DEFINE_SUBCLK(sd, 1);
  56 static DEFINE_CLK(dmac, 5);
  57 static DEFINE_CLK(atapi, 6);
  58 static DEFINE_CLK(emc, 7);
  59 static DEFINE_SUBCLK(rmii, 2);
  60 static DEFINE_CLK(usbd, 8);
  61 static DEFINE_CLK(usbh, 9);
  62 static DEFINE_CLK(g2d, 10);;
  63 static DEFINE_CLK(pwm, 18);
  64 static DEFINE_CLK(ps2, 24);
  65 static DEFINE_CLK(kpi, 25);
  66 static DEFINE_CLK(wdt, 26);
  67 static DEFINE_CLK(gdma, 27);
  68 static DEFINE_CLK(adc, 28);
  69 static DEFINE_CLK(usi, 29);
  70 static DEFINE_CLK(ext, 0);
  71
  72 static struct clk_lookup nuc900_clkregs[] = {
  73         DEF_CLKLOOK(&clk_lcd, "nuc900-lcd", NULL),
  74         DEF_CLKLOOK(&clk_audio, "nuc900-audio", NULL),
  75         DEF_CLKLOOK(&clk_fmi, "nuc900-fmi", NULL),
  76         DEF_CLKLOOK(&clk_ms, "nuc900-fmi", "MS"),
  77         DEF_CLKLOOK(&clk_sd, "nuc900-fmi", "SD"),
  78         DEF_CLKLOOK(&clk_dmac, "nuc900-dmac", NULL),
  79         DEF_CLKLOOK(&clk_atapi, "nuc900-atapi", NULL),
  80         DEF_CLKLOOK(&clk_emc, "nuc900-emc", NULL),
  81         DEF_CLKLOOK(&clk_rmii, "nuc900-emc", "RMII"),
  82         DEF_CLKLOOK(&clk_usbd, "nuc900-usbd", NULL),
  83         DEF_CLKLOOK(&clk_usbh, "nuc900-usbh", NULL),
  84         DEF_CLKLOOK(&clk_g2d, "nuc900-g2d", NULL),
  85         DEF_CLKLOOK(&clk_pwm, "nuc900-pwm", NULL),
  86         DEF_CLKLOOK(&clk_ps2, "nuc900-ps2", NULL),
  87         DEF_CLKLOOK(&clk_kpi, "nuc900-kpi", NULL),
  88         DEF_CLKLOOK(&clk_wdt, "nuc900-wdt", NULL),
  89         DEF_CLKLOOK(&clk_gdma, "nuc900-gdma", NULL),
  90         DEF_CLKLOOK(&clk_adc, "nuc900-adc", NULL),
  91         DEF_CLKLOOK(&clk_usi, "nuc900-spi", NULL),
  92         DEF_CLKLOOK(&clk_ext, NULL, "ext"),
  93 };
  94
  95 /* Initial serial platform data */
  96
  97 struct plat_serial8250_port nuc900_uart_data[] = {
  98         NUC900_8250PORT(UART0),
  99 };
 100
 101 struct platform_device nuc900_serial_device = {
 102         .name                   = "serial8250",
 103         .id                     = PLAT8250_DEV_PLATFORM,
 104         .dev                    = {
 105                 .platform_data  = nuc900_uart_data,
 106         },
 107 };
 108
 109 /*Set NUC900 series cpu frequence*/
 110 static int __init nuc900_set_clkval(unsigned int cpufreq)
 111 {
 112         unsigned int pllclk, ahbclk, apbclk, val;
 113
 114         pllclk = 0;
 115         ahbclk = 0;
 116         apbclk = 0;
 117
 118         switch (cpufreq) {
 119         case 66:
 120                 pllclk = PLL_66MHZ;
 121                 ahbclk = AHB_CPUCLK_1_1;
 122                 apbclk = APB_AHB_1_2;
 123                 break;
 124
 125         case 100:
 126                 pllclk = PLL_100MHZ;
 127                 ahbclk = AHB_CPUCLK_1_1;
 128                 apbclk = APB_AHB_1_2;
 129                 break;
 130
 131         case 120:
 132                 pllclk = PLL_120MHZ;
 133                 ahbclk = AHB_CPUCLK_1_2;
 134                 apbclk = APB_AHB_1_2;
 135                 break;
 136
 137         case 166:
 138                 pllclk = PLL_166MHZ;
 139                 ahbclk = AHB_CPUCLK_1_2;
 140                 apbclk = APB_AHB_1_2;
 141                 break;
 142
 143         case 200:
 144                 pllclk = PLL_200MHZ;
 145                 ahbclk = AHB_CPUCLK_1_2;
 146                 apbclk = APB_AHB_1_2;
 147                 break;
 148         }
 149
 150         __raw_writel(pllclk, REG_PLLCON0);
 151
 152         val = __raw_readl(REG_CLKDIV);
 153         val &= ~(0x03 << 24 | 0x03 << 26);
 154         val |= (ahbclk << 24 | apbclk << 26);
 155         __raw_writel(val, REG_CLKDIV);
 156
 157         return  0;
 158 }
 159 static int __init nuc900_set_cpufreq(char *str)
 160 {
 161         unsigned long cpufreq, val;
 162
 163         if (!*str)
 164                 return 0;
 165
 166         strict_strtoul(str, 0, &cpufreq);
 167
 168         nuc900_clock_source(NULL, "ext");
 169
 170         nuc900_set_clkval(cpufreq);
 171
 172         mdelay(1);
 173
 174         val = __raw_readl(REG_CKSKEW);
 175         val &= ~0xff;
 176         val |= DEFAULTSKEW;
 177         __raw_writel(val, REG_CKSKEW);
 178
 179         nuc900_clock_source(NULL, "pll0");
 180
 181         return 1;
 182 }
 183
 184 __setup("cpufreq=", nuc900_set_cpufreq);
 185
 186 /*Init NUC900 evb io*/
 187
 188 void __init nuc900_map_io(struct map_desc *mach_desc, int mach_size)
 189 {
 190         unsigned long idcode = 0x0;
 191
 192         iotable_init(mach_desc, mach_size);
 193         iotable_init(nuc900_iodesc, ARRAY_SIZE(nuc900_iodesc));
 194
 195         idcode = __raw_readl(NUC900PDID);
 196         if (idcode == NUC910_CPUID)
 197                 printk(KERN_INFO "CPU type 0x%08lx is NUC910\n", idcode);
 198         else if (idcode == NUC920_CPUID)
 199                 printk(KERN_INFO "CPU type 0x%08lx is NUC920\n", idcode);
 200         else if (idcode == NUC950_CPUID)
 201                 printk(KERN_INFO "CPU type 0x%08lx is NUC950\n", idcode);
 202         else if (idcode == NUC960_CPUID)
 203                 printk(KERN_INFO "CPU type 0x%08lx is NUC960\n", idcode);
 204 }
 205
 206 /*Init NUC900 clock*/
 207
 208 void __init nuc900_init_clocks(void)
 209 {
 210         clks_register(nuc900_clkregs, ARRAY_SIZE(nuc900_clkregs));
 211 }
 212