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>
37 /* Crystal clock: 13MHz */
38 #define BASE_CLK 13000000
40 /* Ring Oscillator Clock: 60MHz */
41 #define RO_CLK 60000000
43 #define ACCR_D0CS (1 << 26)
44 #define ACCR_PCCE (1 << 11)
46 /* crystal frequency to static memory controller multiplier (SMCFS) */
47 static unsigned char smcfs_mult[8] = { 6, 0, 8, 0, 0, 16, };
49 /* crystal frequency to HSIO bus frequency multiplier (HSS) */
50 static unsigned char hss_mult[4] = { 8, 12, 16, 0 };
53 * Get the clock frequency as reflected by CCSR and the turbo flag.
54 * We assume these values have been applied via a fcs.
55 * If info is not 0 we also display the current settings.
57 unsigned int pxa3xx_get_clk_frequency_khz(int info)
59 unsigned long acsr, xclkcfg;
60 unsigned int t, xl, xn, hss, ro, XL, XN, CLK, HSS;
62 /* Read XCLKCFG register turbo bit */
63 __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg));
69 xn = (acsr >> 8) & 0x7;
70 hss = (acsr >> 14) & 0x3;
75 ro = acsr & ACCR_D0CS;
77 CLK = (ro) ? RO_CLK : ((t) ? XN : XL);
78 HSS = (ro) ? RO_CLK : hss_mult[hss] * BASE_CLK;
81 pr_info("RO Mode clock: %d.%02dMHz (%sactive)\n",
82 RO_CLK / 1000000, (RO_CLK % 1000000) / 10000,
84 pr_info("Run Mode clock: %d.%02dMHz (*%d)\n",
85 XL / 1000000, (XL % 1000000) / 10000, xl);
86 pr_info("Turbo Mode clock: %d.%02dMHz (*%d, %sactive)\n",
87 XN / 1000000, (XN % 1000000) / 10000, xn,
89 pr_info("HSIO bus clock: %d.%02dMHz\n",
90 HSS / 1000000, (HSS % 1000000) / 10000);
97 * Return the current static memory controller clock frequency
100 unsigned int pxa3xx_get_memclk_frequency_10khz(void)
103 unsigned int smcfs, clk = 0;
107 smcfs = (acsr >> 23) & 0x7;
108 clk = (acsr & ACCR_D0CS) ? RO_CLK : smcfs_mult[smcfs] * BASE_CLK;
110 return (clk / 10000);
113 void pxa3xx_clear_reset_status(unsigned int mask)
115 /* RESET_STATUS_* has a 1:1 mapping with ARSR */
120 * Return the current AC97 clock frequency.
122 static unsigned long clk_pxa3xx_ac97_getrate(struct clk *clk)
124 unsigned long rate = 312000000;
125 unsigned long ac97_div;
129 /* This may loose precision for some rates but won't for the
130 * standard 24.576MHz.
132 rate /= (ac97_div >> 12) & 0x7fff;
133 rate *= (ac97_div & 0xfff);
139 * Return the current HSIO bus clock frequency
141 static unsigned long clk_pxa3xx_hsio_getrate(struct clk *clk)
144 unsigned int hss, hsio_clk;
148 hss = (acsr >> 14) & 0x3;
149 hsio_clk = (acsr & ACCR_D0CS) ? RO_CLK : hss_mult[hss] * BASE_CLK;
154 void clk_pxa3xx_cken_enable(struct clk *clk)
156 unsigned long mask = 1ul << (clk->cken & 0x1f);
164 void clk_pxa3xx_cken_disable(struct clk *clk)
166 unsigned long mask = 1ul << (clk->cken & 0x1f);
174 const struct clkops clk_pxa3xx_cken_ops = {
175 .enable = clk_pxa3xx_cken_enable,
176 .disable = clk_pxa3xx_cken_disable,
179 static const struct clkops clk_pxa3xx_hsio_ops = {
180 .enable = clk_pxa3xx_cken_enable,
181 .disable = clk_pxa3xx_cken_disable,
182 .getrate = clk_pxa3xx_hsio_getrate,
185 static const struct clkops clk_pxa3xx_ac97_ops = {
186 .enable = clk_pxa3xx_cken_enable,
187 .disable = clk_pxa3xx_cken_disable,
188 .getrate = clk_pxa3xx_ac97_getrate,
191 static void clk_pout_enable(struct clk *clk)
196 static void clk_pout_disable(struct clk *clk)
201 static const struct clkops clk_pout_ops = {
202 .enable = clk_pout_enable,
203 .disable = clk_pout_disable,
206 static struct clk pxa3xx_clks[] = {
209 .ops = &clk_pout_ops,
214 PXA3xx_CK("LCDCLK", LCD, &clk_pxa3xx_hsio_ops, &pxa_device_fb.dev),
215 PXA3xx_CK("CAMCLK", CAMERA, &clk_pxa3xx_hsio_ops, NULL),
216 PXA3xx_CK("AC97CLK", AC97, &clk_pxa3xx_ac97_ops, NULL),
218 PXA3xx_CKEN("UARTCLK", FFUART, 14857000, 1, &pxa_device_ffuart.dev),
219 PXA3xx_CKEN("UARTCLK", BTUART, 14857000, 1, &pxa_device_btuart.dev),
220 PXA3xx_CKEN("UARTCLK", STUART, 14857000, 1, NULL),
222 PXA3xx_CKEN("I2CCLK", I2C, 32842000, 0, &pxa_device_i2c.dev),
223 PXA3xx_CKEN("UDCCLK", UDC, 48000000, 5, &pxa27x_device_udc.dev),
224 PXA3xx_CKEN("USBCLK", USBH, 48000000, 0, &pxa27x_device_ohci.dev),
225 PXA3xx_CKEN("KBDCLK", KEYPAD, 32768, 0, &pxa27x_device_keypad.dev),
227 PXA3xx_CKEN("SSPCLK", SSP1, 13000000, 0, &pxa27x_device_ssp1.dev),
228 PXA3xx_CKEN("SSPCLK", SSP2, 13000000, 0, &pxa27x_device_ssp2.dev),
229 PXA3xx_CKEN("SSPCLK", SSP3, 13000000, 0, &pxa27x_device_ssp3.dev),
230 PXA3xx_CKEN("SSPCLK", SSP4, 13000000, 0, &pxa3xx_device_ssp4.dev),
231 PXA3xx_CKEN("PWMCLK", PWM0, 13000000, 0, &pxa27x_device_pwm0.dev),
232 PXA3xx_CKEN("PWMCLK", PWM1, 13000000, 0, &pxa27x_device_pwm1.dev),
234 PXA3xx_CKEN("MMCCLK", MMC1, 19500000, 0, &pxa_device_mci.dev),
235 PXA3xx_CKEN("MMCCLK", MMC2, 19500000, 0, &pxa3xx_device_mci2.dev),
240 #define ISRAM_START 0x5c000000
241 #define ISRAM_SIZE SZ_256K
243 static void __iomem *sram;
244 static unsigned long wakeup_src;
246 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
247 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
249 enum { SLEEP_SAVE_CKENA,
256 static void pxa3xx_cpu_pm_save(unsigned long *sleep_save)
263 static void pxa3xx_cpu_pm_restore(unsigned long *sleep_save)
271 * Enter a standby mode (S0D1C2 or S0D2C2). Upon wakeup, the dynamic
272 * memory controller has to be reinitialised, so we place some code
273 * in the SRAM to perform this function.
275 * We disable FIQs across the standby - otherwise, we might receive a
276 * FIQ while the SDRAM is unavailable.
278 static void pxa3xx_cpu_standby(unsigned int pwrmode)
280 extern const char pm_enter_standby_start[], pm_enter_standby_end[];
281 void (*fn)(unsigned int) = (void __force *)(sram + 0x8000);
283 memcpy_toio(sram + 0x8000, pm_enter_standby_start,
284 pm_enter_standby_end - pm_enter_standby_start);
288 AD2D0ER = wakeup_src;
302 * NOTE: currently, the OBM (OEM Boot Module) binary comes along with
303 * PXA3xx development kits assumes that the resuming process continues
304 * with the address stored within the first 4 bytes of SDRAM. The PSPR
305 * register is used privately by BootROM and OBM, and _must_ be set to
306 * 0x5c014000 for the moment.
308 static void pxa3xx_cpu_pm_suspend(void)
310 volatile unsigned long *p = (volatile void *)0xc0000000;
311 unsigned long saved_data = *p;
313 extern void pxa3xx_cpu_suspend(void);
314 extern void pxa3xx_cpu_resume(void);
316 /* resuming from D2 requires the HSIO2/BOOT/TPM clocks enabled */
317 CKENA |= (1 << CKEN_BOOT) | (1 << CKEN_TPM);
318 CKENB |= 1 << (CKEN_HSIO2 & 0x1f);
320 /* clear and setup wakeup source */
326 PCFR |= (1u << 13); /* L1_DIS */
327 PCFR &= ~((1u << 12) | (1u << 1)); /* L0_EN | SL_ROD */
331 /* overwrite with the resume address */
332 *p = virt_to_phys(pxa3xx_cpu_resume);
334 pxa3xx_cpu_suspend();
341 static void pxa3xx_cpu_pm_enter(suspend_state_t state)
344 * Don't sleep if no wakeup sources are defined
346 if (wakeup_src == 0) {
347 printk(KERN_ERR "Not suspending: no wakeup sources\n");
352 case PM_SUSPEND_STANDBY:
353 pxa3xx_cpu_standby(PXA3xx_PM_S0D2C2);
357 pxa3xx_cpu_pm_suspend();
362 static int pxa3xx_cpu_pm_valid(suspend_state_t state)
364 return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
367 static struct pxa_cpu_pm_fns pxa3xx_cpu_pm_fns = {
368 .save_count = SLEEP_SAVE_COUNT,
369 .save = pxa3xx_cpu_pm_save,
370 .restore = pxa3xx_cpu_pm_restore,
371 .valid = pxa3xx_cpu_pm_valid,
372 .enter = pxa3xx_cpu_pm_enter,
375 static void __init pxa3xx_init_pm(void)
377 sram = ioremap(ISRAM_START, ISRAM_SIZE);
379 printk(KERN_ERR "Unable to map ISRAM: disabling standby/suspend\n");
384 * Since we copy wakeup code into the SRAM, we need to ensure
385 * that it is preserved over the low power modes. Note: bit 8
386 * is undocumented in the developer manual, but must be set.
388 AD1R |= ADXR_L2 | ADXR_R0;
389 AD2R |= ADXR_L2 | ADXR_R0;
390 AD3R |= ADXR_L2 | ADXR_R0;
393 * Clear the resume enable registers.
400 pxa_cpu_pm_fns = &pxa3xx_cpu_pm_fns;
403 static int pxa3xx_set_wake(unsigned int irq, unsigned int on)
405 unsigned long flags, mask = 0;
409 mask = ADXER_MFP_WSSP3;
422 mask = ADXER_MFP_WAC97;
428 mask = ADXER_MFP_WSSP2;
431 mask = ADXER_MFP_WI2C;
434 mask = ADXER_MFP_WUART3;
437 mask = ADXER_MFP_WUART2;
440 mask = ADXER_MFP_WUART1;
443 mask = ADXER_MFP_WMMC1;
446 mask = ADXER_MFP_WSSP1;
452 mask = ADXER_MFP_WSSP4;
461 mask = ADXER_MFP_WMMC2;
464 mask = ADXER_MFP_WFLASH;
470 mask = ADXER_WEXTWAKE0;
473 mask = ADXER_WEXTWAKE1;
476 mask = ADXER_MFP_GEN12;
482 local_irq_save(flags);
487 local_irq_restore(flags);
492 static inline void pxa3xx_init_pm(void) {}
493 #define pxa3xx_set_wake NULL
496 void __init pxa3xx_init_irq(void)
498 /* enable CP6 access */
500 __asm__ __volatile__("mrc p15, 0, %0, c15, c1, 0\n": "=r"(value));
502 __asm__ __volatile__("mcr p15, 0, %0, c15, c1, 0\n": :"r"(value));
504 pxa_init_irq(56, pxa3xx_set_wake);
505 pxa_init_gpio(128, NULL);
509 * device registration specific to PXA3xx.
512 static struct platform_device *devices[] __initdata = {
513 /* &pxa_device_udc, The UDC driver is PXA25x only */
527 static struct sys_device pxa3xx_sysdev[] = {
529 .cls = &pxa_irq_sysclass,
531 .cls = &pxa3xx_mfp_sysclass,
533 .cls = &pxa_gpio_sysclass,
537 static int __init pxa3xx_init(void)
541 if (cpu_is_pxa3xx()) {
546 * clear RDH bit every time after reset
548 * Note: the last 3 bits DxS are write-1-to-clear so carefully
549 * preserve them here in case they will be referenced later
551 ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S);
553 clks_register(pxa3xx_clks, ARRAY_SIZE(pxa3xx_clks));
555 if ((ret = pxa_init_dma(32)))
560 for (i = 0; i < ARRAY_SIZE(pxa3xx_sysdev); i++) {
561 ret = sysdev_register(&pxa3xx_sysdev[i]);
563 pr_err("failed to register sysdev[%d]\n", i);
566 ret = platform_add_devices(devices, ARRAY_SIZE(devices));
572 postcore_initcall(pxa3xx_init);