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 <asm/hardware.h>
26 #include <asm/arch/pxa3xx-regs.h>
27 #include <asm/arch/ohci.h>
28 #include <asm/arch/pm.h>
29 #include <asm/arch/dma.h>
30 #include <asm/arch/ssp.h>
36 /* Crystal clock: 13MHz */
37 #define BASE_CLK 13000000
39 /* Ring Oscillator Clock: 60MHz */
40 #define RO_CLK 60000000
42 #define ACCR_D0CS (1 << 26)
43 #define ACCR_PCCE (1 << 11)
45 /* crystal frequency to static memory controller multiplier (SMCFS) */
46 static unsigned char smcfs_mult[8] = { 6, 0, 8, 0, 0, 16, };
48 /* crystal frequency to HSIO bus frequency multiplier (HSS) */
49 static unsigned char hss_mult[4] = { 8, 12, 16, 0 };
52 * Get the clock frequency as reflected by CCSR and the turbo flag.
53 * We assume these values have been applied via a fcs.
54 * If info is not 0 we also display the current settings.
56 unsigned int pxa3xx_get_clk_frequency_khz(int info)
58 unsigned long acsr, xclkcfg;
59 unsigned int t, xl, xn, hss, ro, XL, XN, CLK, HSS;
61 /* Read XCLKCFG register turbo bit */
62 __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg));
68 xn = (acsr >> 8) & 0x7;
69 hss = (acsr >> 14) & 0x3;
74 ro = acsr & ACCR_D0CS;
76 CLK = (ro) ? RO_CLK : ((t) ? XN : XL);
77 HSS = (ro) ? RO_CLK : hss_mult[hss] * BASE_CLK;
80 pr_info("RO Mode clock: %d.%02dMHz (%sactive)\n",
81 RO_CLK / 1000000, (RO_CLK % 1000000) / 10000,
83 pr_info("Run Mode clock: %d.%02dMHz (*%d)\n",
84 XL / 1000000, (XL % 1000000) / 10000, xl);
85 pr_info("Turbo Mode clock: %d.%02dMHz (*%d, %sactive)\n",
86 XN / 1000000, (XN % 1000000) / 10000, xn,
88 pr_info("HSIO bus clock: %d.%02dMHz\n",
89 HSS / 1000000, (HSS % 1000000) / 10000);
96 * Return the current static memory controller clock frequency
99 unsigned int pxa3xx_get_memclk_frequency_10khz(void)
102 unsigned int smcfs, clk = 0;
106 smcfs = (acsr >> 23) & 0x7;
107 clk = (acsr & ACCR_D0CS) ? RO_CLK : smcfs_mult[smcfs] * BASE_CLK;
109 return (clk / 10000);
113 * Return the current AC97 clock frequency.
115 static unsigned long clk_pxa3xx_ac97_getrate(struct clk *clk)
117 unsigned long rate = 312000000;
118 unsigned long ac97_div;
122 /* This may loose precision for some rates but won't for the
123 * standard 24.576MHz.
125 rate /= (ac97_div >> 12) & 0x7fff;
126 rate *= (ac97_div & 0xfff);
132 * Return the current HSIO bus clock frequency
134 static unsigned long clk_pxa3xx_hsio_getrate(struct clk *clk)
137 unsigned int hss, hsio_clk;
141 hss = (acsr >> 14) & 0x3;
142 hsio_clk = (acsr & ACCR_D0CS) ? RO_CLK : hss_mult[hss] * BASE_CLK;
147 static void clk_pxa3xx_cken_enable(struct clk *clk)
149 unsigned long mask = 1ul << (clk->cken & 0x1f);
157 static void clk_pxa3xx_cken_disable(struct clk *clk)
159 unsigned long mask = 1ul << (clk->cken & 0x1f);
167 static const struct clkops clk_pxa3xx_cken_ops = {
168 .enable = clk_pxa3xx_cken_enable,
169 .disable = clk_pxa3xx_cken_disable,
172 static const struct clkops clk_pxa3xx_hsio_ops = {
173 .enable = clk_pxa3xx_cken_enable,
174 .disable = clk_pxa3xx_cken_disable,
175 .getrate = clk_pxa3xx_hsio_getrate,
178 static const struct clkops clk_pxa3xx_ac97_ops = {
179 .enable = clk_pxa3xx_cken_enable,
180 .disable = clk_pxa3xx_cken_disable,
181 .getrate = clk_pxa3xx_ac97_getrate,
184 static void clk_pout_enable(struct clk *clk)
189 static void clk_pout_disable(struct clk *clk)
194 static const struct clkops clk_pout_ops = {
195 .enable = clk_pout_enable,
196 .disable = clk_pout_disable,
199 #define PXA3xx_CKEN(_name, _cken, _rate, _delay, _dev) \
203 .ops = &clk_pxa3xx_cken_ops, \
205 .cken = CKEN_##_cken, \
209 #define PXA3xx_CK(_name, _cken, _ops, _dev) \
214 .cken = CKEN_##_cken, \
217 static struct clk pxa3xx_clks[] = {
220 .ops = &clk_pout_ops,
225 PXA3xx_CK("LCDCLK", LCD, &clk_pxa3xx_hsio_ops, &pxa_device_fb.dev),
226 PXA3xx_CK("CAMCLK", CAMERA, &clk_pxa3xx_hsio_ops, NULL),
227 PXA3xx_CK("AC97CLK", AC97, &clk_pxa3xx_ac97_ops, NULL),
229 PXA3xx_CKEN("UARTCLK", FFUART, 14857000, 1, &pxa_device_ffuart.dev),
230 PXA3xx_CKEN("UARTCLK", BTUART, 14857000, 1, &pxa_device_btuart.dev),
231 PXA3xx_CKEN("UARTCLK", STUART, 14857000, 1, NULL),
233 PXA3xx_CKEN("I2CCLK", I2C, 32842000, 0, &pxa_device_i2c.dev),
234 PXA3xx_CKEN("UDCCLK", UDC, 48000000, 5, &pxa_device_udc.dev),
235 PXA3xx_CKEN("USBCLK", USBH, 48000000, 0, &pxa27x_device_ohci.dev),
236 PXA3xx_CKEN("KBDCLK", KEYPAD, 32768, 0, &pxa27x_device_keypad.dev),
238 PXA3xx_CKEN("SSPCLK", SSP1, 13000000, 0, &pxa27x_device_ssp1.dev),
239 PXA3xx_CKEN("SSPCLK", SSP2, 13000000, 0, &pxa27x_device_ssp2.dev),
240 PXA3xx_CKEN("SSPCLK", SSP3, 13000000, 0, &pxa27x_device_ssp3.dev),
241 PXA3xx_CKEN("SSPCLK", SSP4, 13000000, 0, &pxa3xx_device_ssp4.dev),
243 PXA3xx_CKEN("MMCCLK", MMC1, 19500000, 0, &pxa_device_mci.dev),
244 PXA3xx_CKEN("MMCCLK", MMC2, 19500000, 0, &pxa3xx_device_mci2.dev),
245 PXA3xx_CKEN("MMCCLK", MMC3, 19500000, 0, &pxa3xx_device_mci3.dev),
250 #define ISRAM_START 0x5c000000
251 #define ISRAM_SIZE SZ_256K
253 static void __iomem *sram;
254 static unsigned long wakeup_src;
256 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
257 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
259 enum { SLEEP_SAVE_START = 0,
267 static void pxa3xx_cpu_pm_save(unsigned long *sleep_save)
274 static void pxa3xx_cpu_pm_restore(unsigned long *sleep_save)
282 * Enter a standby mode (S0D1C2 or S0D2C2). Upon wakeup, the dynamic
283 * memory controller has to be reinitialised, so we place some code
284 * in the SRAM to perform this function.
286 * We disable FIQs across the standby - otherwise, we might receive a
287 * FIQ while the SDRAM is unavailable.
289 static void pxa3xx_cpu_standby(unsigned int pwrmode)
291 extern const char pm_enter_standby_start[], pm_enter_standby_end[];
292 void (*fn)(unsigned int) = (void __force *)(sram + 0x8000);
294 memcpy_toio(sram + 0x8000, pm_enter_standby_start,
295 pm_enter_standby_end - pm_enter_standby_start);
299 AD2D0ER = wakeup_src;
313 * NOTE: currently, the OBM (OEM Boot Module) binary comes along with
314 * PXA3xx development kits assumes that the resuming process continues
315 * with the address stored within the first 4 bytes of SDRAM. The PSPR
316 * register is used privately by BootROM and OBM, and _must_ be set to
317 * 0x5c014000 for the moment.
319 static void pxa3xx_cpu_pm_suspend(void)
321 volatile unsigned long *p = (volatile void *)0xc0000000;
322 unsigned long saved_data = *p;
324 extern void pxa3xx_cpu_suspend(void);
325 extern void pxa3xx_cpu_resume(void);
327 /* resuming from D2 requires the HSIO2/BOOT/TPM clocks enabled */
328 CKENA |= (1 << CKEN_BOOT) | (1 << CKEN_TPM);
329 CKENB |= 1 << (CKEN_HSIO2 & 0x1f);
331 /* clear and setup wakeup source */
337 PCFR |= (1u << 13); /* L1_DIS */
338 PCFR &= ~((1u << 12) | (1u << 1)); /* L0_EN | SL_ROD */
342 /* overwrite with the resume address */
343 *p = virt_to_phys(pxa3xx_cpu_resume);
345 pxa3xx_cpu_suspend();
352 static void pxa3xx_cpu_pm_enter(suspend_state_t state)
355 * Don't sleep if no wakeup sources are defined
357 if (wakeup_src == 0) {
358 printk(KERN_ERR "Not suspending: no wakeup sources\n");
363 case PM_SUSPEND_STANDBY:
364 pxa3xx_cpu_standby(PXA3xx_PM_S0D2C2);
368 pxa3xx_cpu_pm_suspend();
373 static int pxa3xx_cpu_pm_valid(suspend_state_t state)
375 return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
378 static struct pxa_cpu_pm_fns pxa3xx_cpu_pm_fns = {
379 .save_size = SLEEP_SAVE_SIZE,
380 .save = pxa3xx_cpu_pm_save,
381 .restore = pxa3xx_cpu_pm_restore,
382 .valid = pxa3xx_cpu_pm_valid,
383 .enter = pxa3xx_cpu_pm_enter,
386 static void __init pxa3xx_init_pm(void)
388 sram = ioremap(ISRAM_START, ISRAM_SIZE);
390 printk(KERN_ERR "Unable to map ISRAM: disabling standby/suspend\n");
395 * Since we copy wakeup code into the SRAM, we need to ensure
396 * that it is preserved over the low power modes. Note: bit 8
397 * is undocumented in the developer manual, but must be set.
399 AD1R |= ADXR_L2 | ADXR_R0;
400 AD2R |= ADXR_L2 | ADXR_R0;
401 AD3R |= ADXR_L2 | ADXR_R0;
404 * Clear the resume enable registers.
411 pxa_cpu_pm_fns = &pxa3xx_cpu_pm_fns;
414 static int pxa3xx_set_wake(unsigned int irq, unsigned int on)
416 unsigned long flags, mask = 0;
420 mask = ADXER_MFP_WSSP3;
433 mask = ADXER_MFP_WAC97;
439 mask = ADXER_MFP_WSSP2;
442 mask = ADXER_MFP_WI2C;
445 mask = ADXER_MFP_WUART3;
448 mask = ADXER_MFP_WUART2;
451 mask = ADXER_MFP_WUART1;
454 mask = ADXER_MFP_WMMC1;
457 mask = ADXER_MFP_WSSP1;
463 mask = ADXER_MFP_WSSP4;
472 mask = ADXER_MFP_WMMC2;
475 mask = ADXER_MFP_WFLASH;
481 mask = ADXER_WEXTWAKE0;
484 mask = ADXER_WEXTWAKE1;
487 mask = ADXER_MFP_GEN12;
493 local_irq_save(flags);
498 local_irq_restore(flags);
503 static inline void pxa3xx_init_pm(void) {}
504 #define pxa3xx_set_wake NULL
507 void __init pxa3xx_init_irq(void)
509 /* enable CP6 access */
511 __asm__ __volatile__("mrc p15, 0, %0, c15, c1, 0\n": "=r"(value));
513 __asm__ __volatile__("mcr p15, 0, %0, c15, c1, 0\n": :"r"(value));
515 pxa_init_irq(56, pxa3xx_set_wake);
516 pxa_init_gpio(128, NULL);
520 * device registration specific to PXA3xx.
523 static struct platform_device *devices[] __initdata = {
536 static struct sys_device pxa3xx_sysdev[] = {
538 .cls = &pxa_irq_sysclass,
540 .cls = &pxa3xx_mfp_sysclass,
542 .cls = &pxa_gpio_sysclass,
546 static int __init pxa3xx_init(void)
550 if (cpu_is_pxa3xx()) {
552 * clear RDH bit every time after reset
554 * Note: the last 3 bits DxS are write-1-to-clear so carefully
555 * preserve them here in case they will be referenced later
557 ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S);
559 clks_register(pxa3xx_clks, ARRAY_SIZE(pxa3xx_clks));
561 if ((ret = pxa_init_dma(32)))
566 for (i = 0; i < ARRAY_SIZE(pxa3xx_sysdev); i++) {
567 ret = sysdev_register(&pxa3xx_sysdev[i]);
569 pr_err("failed to register sysdev[%d]\n", i);
572 ret = platform_add_devices(devices, ARRAY_SIZE(devices));
578 postcore_initcall(pxa3xx_init);