arch/arm/mach-pxa/pxa25x.c

   1 /*
   2  *  linux/arch/arm/mach-pxa/pxa25x.c
   3  *
   4  *  Author:     Nicolas Pitre
   5  *  Created:    Jun 15, 2001
   6  *  Copyright:  MontaVista Software Inc.
   7  *
   8  * Code specific to PXA21x/25x/26x variants.
   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 version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * Since this file should be linked before any other machine specific file,
  15  * the __initcall() here will be executed first.  This serves as default
  16  * initialization stuff for PXA machines which can be overridden later if
  17  * need be.
  18  */
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/init.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/suspend.h>
  24 #include <linux/sysdev.h>
  25
  26 #include <asm/hardware.h>
  27 #include <asm/arch/irqs.h>
  28 #include <asm/arch/pxa-regs.h>
  29 #include <asm/arch/mfp-pxa25x.h>
  30 #include <asm/arch/pm.h>
  31 #include <asm/arch/dma.h>
  32
  33 #include "generic.h"
  34 #include "devices.h"
  35 #include "clock.h"
  36
  37 /*
  38  * Various clock factors driven by the CCCR register.
  39  */
  40
  41 /* Crystal Frequency to Memory Frequency Multiplier (L) */
  42 static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
  43
  44 /* Memory Frequency to Run Mode Frequency Multiplier (M) */
  45 static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
  46
  47 /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
  48 /* Note: we store the value N * 2 here. */
  49 static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
  50
  51 /* Crystal clock */
  52 #define BASE_CLK        3686400
  53
  54 /*
  55  * Get the clock frequency as reflected by CCCR and the turbo flag.
  56  * We assume these values have been applied via a fcs.
  57  * If info is not 0 we also display the current settings.
  58  */
  59 unsigned int pxa25x_get_clk_frequency_khz(int info)
  60 {
  61         unsigned long cccr, turbo;
  62         unsigned int l, L, m, M, n2, N;
  63
  64         cccr = CCCR;
  65         asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );
  66
  67         l  =  L_clk_mult[(cccr >> 0) & 0x1f];
  68         m  =  M_clk_mult[(cccr >> 5) & 0x03];
  69         n2 = N2_clk_mult[(cccr >> 7) & 0x07];
  70
  71         L = l * BASE_CLK;
  72         M = m * L;
  73         N = n2 * M / 2;
  74
  75         if(info)
  76         {
  77                 L += 5000;
  78                 printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
  79                         L / 1000000, (L % 1000000) / 10000, l );
  80                 M += 5000;
  81                 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
  82                         M / 1000000, (M % 1000000) / 10000, m );
  83                 N += 5000;
  84                 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
  85                         N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,
  86                         (turbo & 1) ? "" : "in" );
  87         }
  88
  89         return (turbo & 1) ? (N/1000) : (M/1000);
  90 }
  91
  92 /*
  93  * Return the current memory clock frequency in units of 10kHz
  94  */
  95 unsigned int pxa25x_get_memclk_frequency_10khz(void)
  96 {
  97         return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;
  98 }
  99
 100 static unsigned long clk_pxa25x_lcd_getrate(struct clk *clk)
 101 {
 102         return pxa25x_get_memclk_frequency_10khz() * 10000;
 103 }
 104
 105 static const struct clkops clk_pxa25x_lcd_ops = {
 106         .enable         = clk_cken_enable,
 107         .disable        = clk_cken_disable,
 108         .getrate        = clk_pxa25x_lcd_getrate,
 109 };
 110
 111 /*
 112  * 3.6864MHz -> OST, GPIO, SSP, PWM, PLLs (95.842MHz, 147.456MHz)
 113  * 95.842MHz -> MMC 19.169MHz, I2C 31.949MHz, FICP 47.923MHz, USB 47.923MHz
 114  * 147.456MHz -> UART 14.7456MHz, AC97 12.288MHz, I2S 5.672MHz (allegedly)
 115  */
 116 static struct clk pxa25x_hwuart_clk =
 117         INIT_CKEN("UARTCLK", HWUART, 14745600, 1, &pxa_device_hwuart.dev)
 118 ;
 119
 120 static struct clk pxa25x_clks[] = {
 121         INIT_CK("LCDCLK", LCD, &clk_pxa25x_lcd_ops, &pxa_device_fb.dev),
 122         INIT_CKEN("UARTCLK", FFUART, 14745600, 1, &pxa_device_ffuart.dev),
 123         INIT_CKEN("UARTCLK", BTUART, 14745600, 1, &pxa_device_btuart.dev),
 124         INIT_CKEN("UARTCLK", STUART, 14745600, 1, NULL),
 125         INIT_CKEN("UDCCLK", USB, 47923000, 5, &pxa_device_udc.dev),
 126         INIT_CKEN("MMCCLK", MMC, 19169000, 0, &pxa_device_mci.dev),
 127         INIT_CKEN("I2CCLK", I2C, 31949000, 0, &pxa_device_i2c.dev),
 128
 129         INIT_CKEN("SSPCLK",  SSP, 3686400, 0, &pxa25x_device_ssp.dev),
 130         INIT_CKEN("SSPCLK", NSSP, 3686400, 0, &pxa25x_device_nssp.dev),
 131         INIT_CKEN("SSPCLK", ASSP, 3686400, 0, &pxa25x_device_assp.dev),
 132
 133         INIT_CKEN("AC97CLK",     AC97,     24576000, 0, NULL),
 134
 135         /*
 136         INIT_CKEN("PWMCLK",  PWM0, 3686400,  0, NULL),
 137         INIT_CKEN("PWMCLK",  PWM0, 3686400,  0, NULL),
 138         INIT_CKEN("I2SCLK",  I2S,  14745600, 0, NULL),
 139         */
 140         INIT_CKEN("FICPCLK", FICP, 47923000, 0, NULL),
 141 };
 142
 143 #ifdef CONFIG_PM
 144
 145 #define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
 146 #define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]
 147
 148 /*
 149  * List of global PXA peripheral registers to preserve.
 150  * More ones like CP and general purpose register values are preserved
 151  * with the stack pointer in sleep.S.
 152  */
 153 enum {  SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2,
 154
 155         SLEEP_SAVE_GAFR0_L, SLEEP_SAVE_GAFR0_U,
 156         SLEEP_SAVE_GAFR1_L, SLEEP_SAVE_GAFR1_U,
 157         SLEEP_SAVE_GAFR2_L, SLEEP_SAVE_GAFR2_U,
 158
 159         SLEEP_SAVE_PSTR,
 160
 161         SLEEP_SAVE_CKEN,
 162
 163         SLEEP_SAVE_COUNT
 164 };
 165
 166
 167 static void pxa25x_cpu_pm_save(unsigned long *sleep_save)
 168 {
 169         SAVE(PGSR0); SAVE(PGSR1); SAVE(PGSR2);
 170
 171         SAVE(GAFR0_L); SAVE(GAFR0_U);
 172         SAVE(GAFR1_L); SAVE(GAFR1_U);
 173         SAVE(GAFR2_L); SAVE(GAFR2_U);
 174
 175         SAVE(CKEN);
 176         SAVE(PSTR);
 177
 178         /* Clear GPIO transition detect bits */
 179         GEDR0 = GEDR0; GEDR1 = GEDR1; GEDR2 = GEDR2;
 180 }
 181
 182 static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
 183 {
 184         /* ensure not to come back here if it wasn't intended */
 185         PSPR = 0;
 186
 187         /* restore registers */
 188         RESTORE(GAFR0_L); RESTORE(GAFR0_U);
 189         RESTORE(GAFR1_L); RESTORE(GAFR1_U);
 190         RESTORE(GAFR2_L); RESTORE(GAFR2_U);
 191         RESTORE(PGSR0); RESTORE(PGSR1); RESTORE(PGSR2);
 192
 193         PSSR = PSSR_RDH | PSSR_PH;
 194
 195         RESTORE(CKEN);
 196         RESTORE(PSTR);
 197 }
 198
 199 static void pxa25x_cpu_pm_enter(suspend_state_t state)
 200 {
 201         /* Clear reset status */
 202         RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;
 203
 204         switch (state) {
 205         case PM_SUSPEND_MEM:
 206                 /* set resume return address */
 207                 PSPR = virt_to_phys(pxa_cpu_resume);
 208                 pxa25x_cpu_suspend(PWRMODE_SLEEP);
 209                 break;
 210         }
 211 }
 212
 213 static struct pxa_cpu_pm_fns pxa25x_cpu_pm_fns = {
 214         .save_count     = SLEEP_SAVE_COUNT,
 215         .valid          = suspend_valid_only_mem,
 216         .save           = pxa25x_cpu_pm_save,
 217         .restore        = pxa25x_cpu_pm_restore,
 218         .enter          = pxa25x_cpu_pm_enter,
 219 };
 220
 221 static void __init pxa25x_init_pm(void)
 222 {
 223         pxa_cpu_pm_fns = &pxa25x_cpu_pm_fns;
 224 }
 225 #else
 226 static inline void pxa25x_init_pm(void) {}
 227 #endif
 228
 229 /* PXA25x: supports wakeup from GPIO0..GPIO15 and RTC alarm
 230  */
 231
 232 static int pxa25x_set_wake(unsigned int irq, unsigned int on)
 233 {
 234         int gpio = IRQ_TO_GPIO(irq);
 235         uint32_t mask = 0;
 236
 237         if (gpio >= 0 && gpio < 85)
 238                 return gpio_set_wake(gpio, on);
 239
 240         if (irq == IRQ_RTCAlrm) {
 241                 mask = PWER_RTC;
 242                 goto set_pwer;
 243         }
 244
 245         return -EINVAL;
 246
 247 set_pwer:
 248         if (on)
 249                 PWER |= mask;
 250         else
 251                 PWER &=~mask;
 252
 253         return 0;
 254 }
 255
 256 void __init pxa25x_init_irq(void)
 257 {
 258         pxa_init_irq(32, pxa25x_set_wake);
 259         pxa_init_gpio(85, pxa25x_set_wake);
 260 }
 261
 262 static struct platform_device *pxa25x_devices[] __initdata = {
 263         &pxa_device_udc,
 264         &pxa_device_ffuart,
 265         &pxa_device_btuart,
 266         &pxa_device_stuart,
 267         &pxa_device_i2s,
 268         &pxa_device_rtc,
 269         &pxa25x_device_ssp,
 270         &pxa25x_device_nssp,
 271         &pxa25x_device_assp,
 272 };
 273
 274 static struct sys_device pxa25x_sysdev[] = {
 275         {
 276                 .cls    = &pxa_irq_sysclass,
 277         }, {
 278                 .cls    = &pxa_gpio_sysclass,
 279         },
 280 };
 281
 282 static int __init pxa25x_init(void)
 283 {
 284         int i, ret = 0;
 285
 286         /* Only add HWUART for PXA255/26x; PXA210/250/27x do not have it. */
 287         if (cpu_is_pxa25x())
 288                 clks_register(&pxa25x_hwuart_clk, 1);
 289
 290         if (cpu_is_pxa21x() || cpu_is_pxa25x()) {
 291                 clks_register(pxa25x_clks, ARRAY_SIZE(pxa25x_clks));
 292
 293                 if ((ret = pxa_init_dma(16)))
 294                         return ret;
 295
 296                 pxa25x_init_pm();
 297
 298                 for (i = 0; i < ARRAY_SIZE(pxa25x_sysdev); i++) {
 299                         ret = sysdev_register(&pxa25x_sysdev[i]);
 300                         if (ret)
 301                                 pr_err("failed to register sysdev[%d]\n", i);
 302                 }
 303
 304                 ret = platform_add_devices(pxa25x_devices,
 305                                            ARRAY_SIZE(pxa25x_devices));
 306                 if (ret)
 307                         return ret;
 308         }
 309
 310         /* Only add HWUART for PXA255/26x; PXA210/250/27x do not have it. */
 311         if (cpu_is_pxa25x())
 312                 ret = platform_device_register(&pxa_device_hwuart);
 313
 314         return ret;
 315 }
 316
 317 postcore_initcall(pxa25x_init);