2 * linux/arch/arm/mach-pxa/pxa3xx.c
4 * code specific to pxa3xx aka Monahans
6 * Copyright (C) 2006 Marvell International Ltd.
8 * 2007-09-02: eric miao <eric.miao@marvell.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/init.h>
20 #include <linux/platform_device.h>
21 #include <linux/irq.h>
23 #include <linux/sysdev.h>
25 #include <mach/hardware.h>
26 #include <mach/pxa3xx-regs.h>
27 #include <mach/reset.h>
28 #include <mach/ohci.h>
38 /* Crystal clock: 13MHz */
39 #define BASE_CLK 13000000
41 /* Ring Oscillator Clock: 60MHz */
42 #define RO_CLK 60000000
44 #define ACCR_D0CS (1 << 26)
45 #define ACCR_PCCE (1 << 11)
47 /* crystal frequency to static memory controller multiplier (SMCFS) */
48 static unsigned char smcfs_mult[8] = { 6, 0, 8, 0, 0, 16, };
50 /* crystal frequency to HSIO bus frequency multiplier (HSS) */
51 static unsigned char hss_mult[4] = { 8, 12, 16, 0 };
54 * Get the clock frequency as reflected by CCSR and the turbo flag.
55 * We assume these values have been applied via a fcs.
56 * If info is not 0 we also display the current settings.
58 unsigned int pxa3xx_get_clk_frequency_khz(int info)
60 unsigned long acsr, xclkcfg;
61 unsigned int t, xl, xn, hss, ro, XL, XN, CLK, HSS;
63 /* Read XCLKCFG register turbo bit */
64 __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg));
70 xn = (acsr >> 8) & 0x7;
71 hss = (acsr >> 14) & 0x3;
76 ro = acsr & ACCR_D0CS;
78 CLK = (ro) ? RO_CLK : ((t) ? XN : XL);
79 HSS = (ro) ? RO_CLK : hss_mult[hss] * BASE_CLK;
82 pr_info("RO Mode clock: %d.%02dMHz (%sactive)\n",
83 RO_CLK / 1000000, (RO_CLK % 1000000) / 10000,
85 pr_info("Run Mode clock: %d.%02dMHz (*%d)\n",
86 XL / 1000000, (XL % 1000000) / 10000, xl);
87 pr_info("Turbo Mode clock: %d.%02dMHz (*%d, %sactive)\n",
88 XN / 1000000, (XN % 1000000) / 10000, xn,
90 pr_info("HSIO bus clock: %d.%02dMHz\n",
91 HSS / 1000000, (HSS % 1000000) / 10000);
98 * Return the current static memory controller clock frequency
101 unsigned int pxa3xx_get_memclk_frequency_10khz(void)
104 unsigned int smcfs, clk = 0;
108 smcfs = (acsr >> 23) & 0x7;
109 clk = (acsr & ACCR_D0CS) ? RO_CLK : smcfs_mult[smcfs] * BASE_CLK;
111 return (clk / 10000);
114 void pxa3xx_clear_reset_status(unsigned int mask)
116 /* RESET_STATUS_* has a 1:1 mapping with ARSR */
121 * Return the current AC97 clock frequency.
123 static unsigned long clk_pxa3xx_ac97_getrate(struct clk *clk)
125 unsigned long rate = 312000000;
126 unsigned long ac97_div;
130 /* This may loose precision for some rates but won't for the
131 * standard 24.576MHz.
133 rate /= (ac97_div >> 12) & 0x7fff;
134 rate *= (ac97_div & 0xfff);
140 * Return the current HSIO bus clock frequency
142 static unsigned long clk_pxa3xx_hsio_getrate(struct clk *clk)
145 unsigned int hss, hsio_clk;
149 hss = (acsr >> 14) & 0x3;
150 hsio_clk = (acsr & ACCR_D0CS) ? RO_CLK : hss_mult[hss] * BASE_CLK;
155 void clk_pxa3xx_cken_enable(struct clk *clk)
157 unsigned long mask = 1ul << (clk->cken & 0x1f);
165 void clk_pxa3xx_cken_disable(struct clk *clk)
167 unsigned long mask = 1ul << (clk->cken & 0x1f);
175 const struct clkops clk_pxa3xx_cken_ops = {
176 .enable = clk_pxa3xx_cken_enable,
177 .disable = clk_pxa3xx_cken_disable,
180 static const struct clkops clk_pxa3xx_hsio_ops = {
181 .enable = clk_pxa3xx_cken_enable,
182 .disable = clk_pxa3xx_cken_disable,
183 .getrate = clk_pxa3xx_hsio_getrate,
186 static const struct clkops clk_pxa3xx_ac97_ops = {
187 .enable = clk_pxa3xx_cken_enable,
188 .disable = clk_pxa3xx_cken_disable,
189 .getrate = clk_pxa3xx_ac97_getrate,
192 static void clk_pout_enable(struct clk *clk)
197 static void clk_pout_disable(struct clk *clk)
202 static const struct clkops clk_pout_ops = {
203 .enable = clk_pout_enable,
204 .disable = clk_pout_disable,
207 static void clk_dummy_enable(struct clk *clk)
211 static void clk_dummy_disable(struct clk *clk)
215 static const struct clkops clk_dummy_ops = {
216 .enable = clk_dummy_enable,
217 .disable = clk_dummy_disable,
220 static struct clk clk_pxa3xx_pout = {
221 .ops = &clk_pout_ops,
226 static struct clk clk_dummy = {
227 .ops = &clk_dummy_ops,
230 static DEFINE_PXA3_CK(pxa3xx_lcd, LCD, &clk_pxa3xx_hsio_ops);
231 static DEFINE_PXA3_CK(pxa3xx_camera, CAMERA, &clk_pxa3xx_hsio_ops);
232 static DEFINE_PXA3_CK(pxa3xx_ac97, AC97, &clk_pxa3xx_ac97_ops);
233 static DEFINE_PXA3_CKEN(pxa3xx_ffuart, FFUART, 14857000, 1);
234 static DEFINE_PXA3_CKEN(pxa3xx_btuart, BTUART, 14857000, 1);
235 static DEFINE_PXA3_CKEN(pxa3xx_stuart, STUART, 14857000, 1);
236 static DEFINE_PXA3_CKEN(pxa3xx_i2c, I2C, 32842000, 0);
237 static DEFINE_PXA3_CKEN(pxa3xx_udc, UDC, 48000000, 5);
238 static DEFINE_PXA3_CKEN(pxa3xx_usbh, USBH, 48000000, 0);
239 static DEFINE_PXA3_CKEN(pxa3xx_keypad, KEYPAD, 32768, 0);
240 static DEFINE_PXA3_CKEN(pxa3xx_ssp1, SSP1, 13000000, 0);
241 static DEFINE_PXA3_CKEN(pxa3xx_ssp2, SSP2, 13000000, 0);
242 static DEFINE_PXA3_CKEN(pxa3xx_ssp3, SSP3, 13000000, 0);
243 static DEFINE_PXA3_CKEN(pxa3xx_ssp4, SSP4, 13000000, 0);
244 static DEFINE_PXA3_CKEN(pxa3xx_pwm0, PWM0, 13000000, 0);
245 static DEFINE_PXA3_CKEN(pxa3xx_pwm1, PWM1, 13000000, 0);
246 static DEFINE_PXA3_CKEN(pxa3xx_mmc1, MMC1, 19500000, 0);
247 static DEFINE_PXA3_CKEN(pxa3xx_mmc2, MMC2, 19500000, 0);
249 static struct clk_lookup pxa3xx_clkregs[] = {
250 INIT_CLKREG(&clk_pxa3xx_pout, NULL, "CLK_POUT"),
251 /* Power I2C clock is always on */
252 INIT_CLKREG(&clk_dummy, "pxa2xx-i2c.1", NULL),
253 INIT_CLKREG(&clk_pxa3xx_lcd, "pxa2xx-fb", NULL),
254 INIT_CLKREG(&clk_pxa3xx_camera, NULL, "CAMCLK"),
255 INIT_CLKREG(&clk_pxa3xx_ac97, NULL, "AC97CLK"),
256 INIT_CLKREG(&clk_pxa3xx_ffuart, "pxa2xx-uart.0", NULL),
257 INIT_CLKREG(&clk_pxa3xx_btuart, "pxa2xx-uart.1", NULL),
258 INIT_CLKREG(&clk_pxa3xx_stuart, "pxa2xx-uart.2", NULL),
259 INIT_CLKREG(&clk_pxa3xx_stuart, "pxa2xx-ir", "UARTCLK"),
260 INIT_CLKREG(&clk_pxa3xx_i2c, "pxa2xx-i2c.0", NULL),
261 INIT_CLKREG(&clk_pxa3xx_udc, "pxa27x-udc", NULL),
262 INIT_CLKREG(&clk_pxa3xx_usbh, "pxa27x-ohci", NULL),
263 INIT_CLKREG(&clk_pxa3xx_keypad, "pxa27x-keypad", NULL),
264 INIT_CLKREG(&clk_pxa3xx_ssp1, "pxa27x-ssp.0", NULL),
265 INIT_CLKREG(&clk_pxa3xx_ssp2, "pxa27x-ssp.1", NULL),
266 INIT_CLKREG(&clk_pxa3xx_ssp3, "pxa27x-ssp.2", NULL),
267 INIT_CLKREG(&clk_pxa3xx_ssp4, "pxa27x-ssp.3", NULL),
268 INIT_CLKREG(&clk_pxa3xx_pwm0, "pxa27x-pwm.0", NULL),
269 INIT_CLKREG(&clk_pxa3xx_pwm1, "pxa27x-pwm.1", NULL),
270 INIT_CLKREG(&clk_pxa3xx_mmc1, "pxa2xx-mci.0", NULL),
271 INIT_CLKREG(&clk_pxa3xx_mmc2, "pxa2xx-mci.1", NULL),
276 #define ISRAM_START 0x5c000000
277 #define ISRAM_SIZE SZ_256K
279 static void __iomem *sram;
280 static unsigned long wakeup_src;
282 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
283 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
285 enum { SLEEP_SAVE_CKENA,
292 static void pxa3xx_cpu_pm_save(unsigned long *sleep_save)
299 static void pxa3xx_cpu_pm_restore(unsigned long *sleep_save)
307 * Enter a standby mode (S0D1C2 or S0D2C2). Upon wakeup, the dynamic
308 * memory controller has to be reinitialised, so we place some code
309 * in the SRAM to perform this function.
311 * We disable FIQs across the standby - otherwise, we might receive a
312 * FIQ while the SDRAM is unavailable.
314 static void pxa3xx_cpu_standby(unsigned int pwrmode)
316 extern const char pm_enter_standby_start[], pm_enter_standby_end[];
317 void (*fn)(unsigned int) = (void __force *)(sram + 0x8000);
319 memcpy_toio(sram + 0x8000, pm_enter_standby_start,
320 pm_enter_standby_end - pm_enter_standby_start);
324 AD2D0ER = wakeup_src;
338 * NOTE: currently, the OBM (OEM Boot Module) binary comes along with
339 * PXA3xx development kits assumes that the resuming process continues
340 * with the address stored within the first 4 bytes of SDRAM. The PSPR
341 * register is used privately by BootROM and OBM, and _must_ be set to
342 * 0x5c014000 for the moment.
344 static void pxa3xx_cpu_pm_suspend(void)
346 volatile unsigned long *p = (volatile void *)0xc0000000;
347 unsigned long saved_data = *p;
349 extern void pxa3xx_cpu_suspend(void);
350 extern void pxa3xx_cpu_resume(void);
352 /* resuming from D2 requires the HSIO2/BOOT/TPM clocks enabled */
353 CKENA |= (1 << CKEN_BOOT) | (1 << CKEN_TPM);
354 CKENB |= 1 << (CKEN_HSIO2 & 0x1f);
356 /* clear and setup wakeup source */
362 PCFR |= (1u << 13); /* L1_DIS */
363 PCFR &= ~((1u << 12) | (1u << 1)); /* L0_EN | SL_ROD */
367 /* overwrite with the resume address */
368 *p = virt_to_phys(pxa3xx_cpu_resume);
370 pxa3xx_cpu_suspend();
377 static void pxa3xx_cpu_pm_enter(suspend_state_t state)
380 * Don't sleep if no wakeup sources are defined
382 if (wakeup_src == 0) {
383 printk(KERN_ERR "Not suspending: no wakeup sources\n");
388 case PM_SUSPEND_STANDBY:
389 pxa3xx_cpu_standby(PXA3xx_PM_S0D2C2);
393 pxa3xx_cpu_pm_suspend();
398 static int pxa3xx_cpu_pm_valid(suspend_state_t state)
400 return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
403 static struct pxa_cpu_pm_fns pxa3xx_cpu_pm_fns = {
404 .save_count = SLEEP_SAVE_COUNT,
405 .save = pxa3xx_cpu_pm_save,
406 .restore = pxa3xx_cpu_pm_restore,
407 .valid = pxa3xx_cpu_pm_valid,
408 .enter = pxa3xx_cpu_pm_enter,
411 static void __init pxa3xx_init_pm(void)
413 sram = ioremap(ISRAM_START, ISRAM_SIZE);
415 printk(KERN_ERR "Unable to map ISRAM: disabling standby/suspend\n");
420 * Since we copy wakeup code into the SRAM, we need to ensure
421 * that it is preserved over the low power modes. Note: bit 8
422 * is undocumented in the developer manual, but must be set.
424 AD1R |= ADXR_L2 | ADXR_R0;
425 AD2R |= ADXR_L2 | ADXR_R0;
426 AD3R |= ADXR_L2 | ADXR_R0;
429 * Clear the resume enable registers.
436 pxa_cpu_pm_fns = &pxa3xx_cpu_pm_fns;
439 static int pxa3xx_set_wake(unsigned int irq, unsigned int on)
441 unsigned long flags, mask = 0;
445 mask = ADXER_MFP_WSSP3;
458 mask = ADXER_MFP_WAC97;
464 mask = ADXER_MFP_WSSP2;
467 mask = ADXER_MFP_WI2C;
470 mask = ADXER_MFP_WUART3;
473 mask = ADXER_MFP_WUART2;
476 mask = ADXER_MFP_WUART1;
479 mask = ADXER_MFP_WMMC1;
482 mask = ADXER_MFP_WSSP1;
488 mask = ADXER_MFP_WSSP4;
497 mask = ADXER_MFP_WMMC2;
500 mask = ADXER_MFP_WFLASH;
506 mask = ADXER_WEXTWAKE0;
509 mask = ADXER_WEXTWAKE1;
512 mask = ADXER_MFP_GEN12;
518 local_irq_save(flags);
523 local_irq_restore(flags);
528 static inline void pxa3xx_init_pm(void) {}
529 #define pxa3xx_set_wake NULL
532 void __init pxa3xx_init_irq(void)
534 /* enable CP6 access */
536 __asm__ __volatile__("mrc p15, 0, %0, c15, c1, 0\n": "=r"(value));
538 __asm__ __volatile__("mcr p15, 0, %0, c15, c1, 0\n": :"r"(value));
540 pxa_init_irq(56, pxa3xx_set_wake);
541 pxa_init_gpio(128, NULL);
545 * device registration specific to PXA3xx.
548 void __init pxa3xx_set_i2c_power_info(struct i2c_pxa_platform_data *info)
550 pxa_register_device(&pxa3xx_device_i2c_power, info);
553 static struct platform_device *devices[] __initdata = {
554 /* &pxa_device_udc, The UDC driver is PXA25x only */
569 static struct sys_device pxa3xx_sysdev[] = {
571 .cls = &pxa_irq_sysclass,
573 .cls = &pxa3xx_mfp_sysclass,
575 .cls = &pxa_gpio_sysclass,
579 static int __init pxa3xx_init(void)
583 if (cpu_is_pxa3xx()) {
588 * clear RDH bit every time after reset
590 * Note: the last 3 bits DxS are write-1-to-clear so carefully
591 * preserve them here in case they will be referenced later
593 ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S);
595 clks_register(pxa3xx_clkregs, ARRAY_SIZE(pxa3xx_clkregs));
597 if ((ret = pxa_init_dma(32)))
602 for (i = 0; i < ARRAY_SIZE(pxa3xx_sysdev); i++) {
603 ret = sysdev_register(&pxa3xx_sysdev[i]);
605 pr_err("failed to register sysdev[%d]\n", i);
608 ret = platform_add_devices(devices, ARRAY_SIZE(devices));
614 postcore_initcall(pxa3xx_init);