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
 102 struct platform_device nuc900_serial_device = {
 103         .name                   = "serial8250",
 104         .id                     = PLAT8250_DEV_PLATFORM,
 105         .dev                    = {
 106                 .platform_data  = nuc900_uart_data,
 107         },
 108 };
 109
 110 /*Set NUC900 series cpu frequence*/
 111 static int __init nuc900_set_clkval(unsigned int cpufreq)
 112 {
 113         unsigned int pllclk, ahbclk, apbclk, val;
 114
 115         pllclk = 0;
 116         ahbclk = 0;
 117         apbclk = 0;
 118
 119         switch (cpufreq) {
 120         case 66:
 121                 pllclk = PLL_66MHZ;
 122                 ahbclk = AHB_CPUCLK_1_1;
 123                 apbclk = APB_AHB_1_2;
 124                 break;
 125
 126         case 100:
 127                 pllclk = PLL_100MHZ;
 128                 ahbclk = AHB_CPUCLK_1_1;
 129                 apbclk = APB_AHB_1_2;
 130                 break;
 131
 132         case 120:
 133                 pllclk = PLL_120MHZ;
 134                 ahbclk = AHB_CPUCLK_1_2;
 135                 apbclk = APB_AHB_1_2;
 136                 break;
 137
 138         case 166:
 139                 pllclk = PLL_166MHZ;
 140                 ahbclk = AHB_CPUCLK_1_2;
 141                 apbclk = APB_AHB_1_2;
 142                 break;
 143
 144         case 200:
 145                 pllclk = PLL_200MHZ;
 146                 ahbclk = AHB_CPUCLK_1_2;
 147                 apbclk = APB_AHB_1_2;
 148                 break;
 149         }
 150
 151         __raw_writel(pllclk, REG_PLLCON0);
 152
 153         val = __raw_readl(REG_CLKDIV);
 154         val &= ~(0x03 << 24 | 0x03 << 26);
 155         val |= (ahbclk << 24 | apbclk << 26);
 156         __raw_writel(val, REG_CLKDIV);
 157
 158         return  0;
 159 }
 160 static int __init nuc900_set_cpufreq(char *str)
 161 {
 162         unsigned long cpufreq, val;
 163
 164         if (!*str)
 165                 return 0;
 166
 167         strict_strtoul(str, 0, &cpufreq);
 168
 169         nuc900_clock_source(NULL, "ext");
 170
 171         nuc900_set_clkval(cpufreq);
 172
 173         mdelay(1);
 174
 175         val = __raw_readl(REG_CKSKEW);
 176         val &= ~0xff;
 177         val |= DEFAULTSKEW;
 178         __raw_writel(val, REG_CKSKEW);
 179
 180         nuc900_clock_source(NULL, "pll0");
 181
 182         return 1;
 183 }
 184
 185 __setup("cpufreq=", nuc900_set_cpufreq);
 186
 187 /*Init NUC900 evb io*/
 188
 189 void __init nuc900_map_io(struct map_desc *mach_desc, int mach_size)
 190 {
 191         unsigned long idcode = 0x0;
 192
 193         iotable_init(mach_desc, mach_size);
 194         iotable_init(nuc900_iodesc, ARRAY_SIZE(nuc900_iodesc));
 195
 196         idcode = __raw_readl(NUC900PDID);
 197         if (idcode == NUC910_CPUID)
 198                 printk(KERN_INFO "CPU type 0x%08lx is NUC910\n", idcode);
 199         else if (idcode == NUC920_CPUID)
 200                 printk(KERN_INFO "CPU type 0x%08lx is NUC920\n", idcode);
 201         else if (idcode == NUC950_CPUID)
 202                 printk(KERN_INFO "CPU type 0x%08lx is NUC950\n", idcode);
 203         else if (idcode == NUC960_CPUID)
 204                 printk(KERN_INFO "CPU type 0x%08lx is NUC960\n", idcode);
 205 }
 206
 207 /*Init NUC900 clock*/
 208
 209 void __init nuc900_init_clocks(void)
 210 {
 211         clks_register(nuc900_clkregs, ARRAY_SIZE(nuc900_clkregs));
 212 }
 213