/* * linux/arch/arm/mach-pxa/pxa25x.c * * Author: Nicolas Pitre * Created: Jun 15, 2001 * Copyright: MontaVista Software Inc. * * Code specific to PXA21x/25x/26x variants. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Since this file should be linked before any other machine specific file, * the __initcall() here will be executed first. This serves as default * initialization stuff for PXA machines which can be overridden later if * need be. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "generic.h" #include "devices.h" #include "clock.h" /* * Various clock factors driven by the CCCR register. */ /* Crystal Frequency to Memory Frequency Multiplier (L) */ static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, }; /* Memory Frequency to Run Mode Frequency Multiplier (M) */ static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 }; /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */ /* Note: we store the value N * 2 here. */ static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 }; /* Crystal clock */ #define BASE_CLK 3686400 /* * Get the clock frequency as reflected by CCCR and the turbo flag. * We assume these values have been applied via a fcs. * If info is not 0 we also display the current settings. */ unsigned int pxa25x_get_clk_frequency_khz(int info) { unsigned long cccr, turbo; unsigned int l, L, m, M, n2, N; cccr = CCCR; asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) ); l = L_clk_mult[(cccr >> 0) & 0x1f]; m = M_clk_mult[(cccr >> 5) & 0x03]; n2 = N2_clk_mult[(cccr >> 7) & 0x07]; L = l * BASE_CLK; M = m * L; N = n2 * M / 2; if(info) { L += 5000; printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n", L / 1000000, (L % 1000000) / 10000, l ); M += 5000; printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n", M / 1000000, (M % 1000000) / 10000, m ); N += 5000; printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n", N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5, (turbo & 1) ? "" : "in" ); } return (turbo & 1) ? (N/1000) : (M/1000); } /* * Return the current memory clock frequency in units of 10kHz */ unsigned int pxa25x_get_memclk_frequency_10khz(void) { return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000; } static unsigned long clk_pxa25x_lcd_getrate(struct clk *clk) { return pxa25x_get_memclk_frequency_10khz() * 10000; } static const struct clkops clk_pxa25x_lcd_ops = { .enable = clk_cken_enable, .disable = clk_cken_disable, .getrate = clk_pxa25x_lcd_getrate, }; static unsigned long gpio12_config_32k[] = { GPIO12_32KHz, }; static unsigned long gpio12_config_gpio[] = { GPIO12_GPIO, }; static void clk_gpio12_enable(struct clk *clk) { pxa2xx_mfp_config(gpio12_config_32k, 1); } static void clk_gpio12_disable(struct clk *clk) { pxa2xx_mfp_config(gpio12_config_gpio, 1); } static const struct clkops clk_pxa25x_gpio12_ops = { .enable = clk_gpio12_enable, .disable = clk_gpio12_disable, }; static unsigned long gpio11_config_3m6[] = { GPIO11_3_6MHz, }; static unsigned long gpio11_config_gpio[] = { GPIO11_GPIO, }; static void clk_gpio11_enable(struct clk *clk) { pxa2xx_mfp_config(gpio11_config_3m6, 1); } static void clk_gpio11_disable(struct clk *clk) { pxa2xx_mfp_config(gpio11_config_gpio, 1); } static const struct clkops clk_pxa25x_gpio11_ops = { .enable = clk_gpio11_enable, .disable = clk_gpio11_disable, }; /* * 3.6864MHz -> OST, GPIO, SSP, PWM, PLLs (95.842MHz, 147.456MHz) * 95.842MHz -> MMC 19.169MHz, I2C 31.949MHz, FICP 47.923MHz, USB 47.923MHz * 147.456MHz -> UART 14.7456MHz, AC97 12.288MHz, I2S 5.672MHz (allegedly) */ static struct clk pxa25x_hwuart_clk = INIT_CKEN("UARTCLK", HWUART, 14745600, 1, &pxa_device_hwuart.dev) ; /* * PXA 2xx clock declarations. */ static struct clk pxa25x_clks[] = { INIT_CK("LCDCLK", LCD, &clk_pxa25x_lcd_ops, &pxa_device_fb.dev), INIT_CKEN("UARTCLK", FFUART, 14745600, 1, &pxa_device_ffuart.dev), INIT_CKEN("UARTCLK", BTUART, 14745600, 1, &pxa_device_btuart.dev), INIT_CKEN("UARTCLK", STUART, 14745600, 1, NULL), INIT_CKEN("UDCCLK", USB, 47923000, 5, &pxa25x_device_udc.dev), INIT_CLK("GPIO11_CLK", &clk_pxa25x_gpio11_ops, 3686400, 0, NULL), INIT_CLK("GPIO12_CLK", &clk_pxa25x_gpio12_ops, 32768, 0, NULL), INIT_CKEN("MMCCLK", MMC, 19169000, 0, &pxa_device_mci.dev), INIT_CKEN("I2CCLK", I2C, 31949000, 0, &pxa_device_i2c.dev), INIT_CKEN("SSPCLK", SSP, 3686400, 0, &pxa25x_device_ssp.dev), INIT_CKEN("SSPCLK", NSSP, 3686400, 0, &pxa25x_device_nssp.dev), INIT_CKEN("SSPCLK", ASSP, 3686400, 0, &pxa25x_device_assp.dev), INIT_CKEN("PWMCLK", PWM0, 3686400, 0, &pxa25x_device_pwm0.dev), INIT_CKEN("PWMCLK", PWM1, 3686400, 0, &pxa25x_device_pwm1.dev), INIT_CKEN("AC97CLK", AC97, 24576000, 0, NULL), /* INIT_CKEN("I2SCLK", I2S, 14745600, 0, NULL), */ INIT_CKEN("FICPCLK", FICP, 47923000, 0, NULL), }; #ifdef CONFIG_PM #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x] /* * List of global PXA peripheral registers to preserve. * More ones like CP and general purpose register values are preserved * with the stack pointer in sleep.S. */ enum { SLEEP_SAVE_PSTR, SLEEP_SAVE_CKEN, SLEEP_SAVE_COUNT }; static void pxa25x_cpu_pm_save(unsigned long *sleep_save) { SAVE(CKEN); SAVE(PSTR); } static void pxa25x_cpu_pm_restore(unsigned long *sleep_save) { RESTORE(CKEN); RESTORE(PSTR); } static void pxa25x_cpu_pm_enter(suspend_state_t state) { /* Clear reset status */ RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR; switch (state) { case PM_SUSPEND_MEM: pxa25x_cpu_suspend(PWRMODE_SLEEP); break; } } static int pxa25x_cpu_pm_prepare(void) { /* set resume return address */ PSPR = virt_to_phys(pxa_cpu_resume); return 0; } static void pxa25x_cpu_pm_finish(void) { /* ensure not to come back here if it wasn't intended */ PSPR = 0; } static struct pxa_cpu_pm_fns pxa25x_cpu_pm_fns = { .save_count = SLEEP_SAVE_COUNT, .valid = suspend_valid_only_mem, .save = pxa25x_cpu_pm_save, .restore = pxa25x_cpu_pm_restore, .enter = pxa25x_cpu_pm_enter, .prepare = pxa25x_cpu_pm_prepare, .finish = pxa25x_cpu_pm_finish, }; static void __init pxa25x_init_pm(void) { pxa_cpu_pm_fns = &pxa25x_cpu_pm_fns; } #else static inline void pxa25x_init_pm(void) {} #endif /* PXA25x: supports wakeup from GPIO0..GPIO15 and RTC alarm */ static int pxa25x_set_wake(unsigned int irq, unsigned int on) { int gpio = IRQ_TO_GPIO(irq); uint32_t mask = 0; if (gpio >= 0 && gpio < 85) return gpio_set_wake(gpio, on); if (irq == IRQ_RTCAlrm) { mask = PWER_RTC; goto set_pwer; } return -EINVAL; set_pwer: if (on) PWER |= mask; else PWER &=~mask; return 0; } void __init pxa25x_init_irq(void) { pxa_init_irq(32, pxa25x_set_wake); pxa_init_gpio(85, pxa25x_set_wake); } static struct platform_device *pxa25x_devices[] __initdata = { &pxa25x_device_udc, &pxa_device_ffuart, &pxa_device_btuart, &pxa_device_stuart, &pxa_device_i2s, &pxa_device_rtc, &pxa25x_device_ssp, &pxa25x_device_nssp, &pxa25x_device_assp, &pxa25x_device_pwm0, &pxa25x_device_pwm1, }; static struct sys_device pxa25x_sysdev[] = { { .cls = &pxa_irq_sysclass, }, { .cls = &pxa2xx_mfp_sysclass, }, { .cls = &pxa_gpio_sysclass, }, }; static int __init pxa25x_init(void) { int i, ret = 0; if (cpu_is_pxa25x()) { reset_status = RCSR; clks_register(pxa25x_clks, ARRAY_SIZE(pxa25x_clks)); if ((ret = pxa_init_dma(16))) return ret; pxa25x_init_pm(); for (i = 0; i < ARRAY_SIZE(pxa25x_sysdev); i++) { ret = sysdev_register(&pxa25x_sysdev[i]); if (ret) pr_err("failed to register sysdev[%d]\n", i); } ret = platform_add_devices(pxa25x_devices, ARRAY_SIZE(pxa25x_devices)); if (ret) return ret; } /* Only add HWUART for PXA255/26x; PXA210/250 do not have it. */ if (cpu_is_pxa255()) { clks_register(&pxa25x_hwuart_clk, 1); ret = platform_device_register(&pxa_device_hwuart); } return ret; } postcore_initcall(pxa25x_init);