/* * Copyright (c) 2011 Samsung Electronics Co., Ltd. * http://www.samsung.com * * Copyright 2008 Openmoko, Inc. * Copyright 2008 Simtec Electronics * Ben Dooks * http://armlinux.simtec.co.uk/ * * Common Codes for S3C64XX machines * * 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. */ /* * NOTE: Code in this file is not used when booting with Device Tree support. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "common.h" /* External clock frequency */ static unsigned long xtal_f = 12000000, xusbxti_f = 48000000; void __init s3c64xx_set_xtal_freq(unsigned long freq) { xtal_f = freq; } void __init s3c64xx_set_xusbxti_freq(unsigned long freq) { xusbxti_f = freq; } /* uart registration process */ static void __init s3c64xx_init_uarts(struct s3c2410_uartcfg *cfg, int no) { s3c24xx_init_uartdevs("s3c6400-uart", s3c64xx_uart_resources, cfg, no); } /* table of supported CPUs */ static const char name_s3c6400[] = "S3C6400"; static const char name_s3c6410[] = "S3C6410"; static struct cpu_table cpu_ids[] __initdata = { { .idcode = S3C6400_CPU_ID, .idmask = S3C64XX_CPU_MASK, .map_io = s3c6400_map_io, .init_uarts = s3c64xx_init_uarts, .init = s3c6400_init, .name = name_s3c6400, }, { .idcode = S3C6410_CPU_ID, .idmask = S3C64XX_CPU_MASK, .map_io = s3c6410_map_io, .init_uarts = s3c64xx_init_uarts, .init = s3c6410_init, .name = name_s3c6410, }, }; /* minimal IO mapping */ /* see notes on uart map in arch/arm/mach-s3c64xx/include/mach/debug-macro.S */ #define UART_OFFS (S3C_PA_UART & 0xfffff) static struct map_desc s3c_iodesc[] __initdata = { { .virtual = (unsigned long)S3C_VA_SYS, .pfn = __phys_to_pfn(S3C64XX_PA_SYSCON), .length = SZ_4K, .type = MT_DEVICE, }, { .virtual = (unsigned long)S3C_VA_MEM, .pfn = __phys_to_pfn(S3C64XX_PA_SROM), .length = SZ_4K, .type = MT_DEVICE, }, { .virtual = (unsigned long)(S3C_VA_UART + UART_OFFS), .pfn = __phys_to_pfn(S3C_PA_UART), .length = SZ_4K, .type = MT_DEVICE, }, { .virtual = (unsigned long)VA_VIC0, .pfn = __phys_to_pfn(S3C64XX_PA_VIC0), .length = SZ_16K, .type = MT_DEVICE, }, { .virtual = (unsigned long)VA_VIC1, .pfn = __phys_to_pfn(S3C64XX_PA_VIC1), .length = SZ_16K, .type = MT_DEVICE, }, { .virtual = (unsigned long)S3C_VA_TIMER, .pfn = __phys_to_pfn(S3C_PA_TIMER), .length = SZ_16K, .type = MT_DEVICE, }, { .virtual = (unsigned long)S3C64XX_VA_GPIO, .pfn = __phys_to_pfn(S3C64XX_PA_GPIO), .length = SZ_4K, .type = MT_DEVICE, }, { .virtual = (unsigned long)S3C64XX_VA_MODEM, .pfn = __phys_to_pfn(S3C64XX_PA_MODEM), .length = SZ_4K, .type = MT_DEVICE, }, { .virtual = (unsigned long)S3C_VA_WATCHDOG, .pfn = __phys_to_pfn(S3C64XX_PA_WATCHDOG), .length = SZ_4K, .type = MT_DEVICE, }, { .virtual = (unsigned long)S3C_VA_USB_HSPHY, .pfn = __phys_to_pfn(S3C64XX_PA_USB_HSPHY), .length = SZ_1K, .type = MT_DEVICE, }, }; static struct bus_type s3c64xx_subsys = { .name = "s3c64xx-core", .dev_name = "s3c64xx-core", }; static struct device s3c64xx_dev = { .bus = &s3c64xx_subsys, }; static struct samsung_pwm_variant s3c64xx_pwm_variant = { .bits = 32, .div_base = 0, .has_tint_cstat = true, .tclk_mask = (1 << 7) | (1 << 6) | (1 << 5), }; void __init samsung_set_timer_source(unsigned int event, unsigned int source) { s3c64xx_pwm_variant.output_mask = BIT(SAMSUNG_PWM_NUM) - 1; s3c64xx_pwm_variant.output_mask &= ~(BIT(event) | BIT(source)); } void __init samsung_timer_init(void) { unsigned int timer_irqs[SAMSUNG_PWM_NUM] = { IRQ_TIMER0_VIC, IRQ_TIMER1_VIC, IRQ_TIMER2_VIC, IRQ_TIMER3_VIC, IRQ_TIMER4_VIC, }; samsung_pwm_clocksource_init(S3C_VA_TIMER, timer_irqs, &s3c64xx_pwm_variant); } /* read cpu identification code */ void __init s3c64xx_init_io(struct map_desc *mach_desc, int size) { /* initialise the io descriptors we need for initialisation */ iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc)); iotable_init(mach_desc, size); /* detect cpu id */ s3c64xx_init_cpu(); s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids)); samsung_pwm_set_platdata(&s3c64xx_pwm_variant); } static __init int s3c64xx_dev_init(void) { /* Not applicable when using DT. */ if (of_have_populated_dt()) return 0; subsys_system_register(&s3c64xx_subsys, NULL); return device_register(&s3c64xx_dev); } core_initcall(s3c64xx_dev_init); /* * setup the sources the vic should advertise resume * for, even though it is not doing the wake * (set_irq_wake needs to be valid) */ #define IRQ_VIC0_RESUME (1 << (IRQ_RTC_TIC - IRQ_VIC0_BASE)) #define IRQ_VIC1_RESUME (1 << (IRQ_RTC_ALARM - IRQ_VIC1_BASE) | \ 1 << (IRQ_PENDN - IRQ_VIC1_BASE) | \ 1 << (IRQ_HSMMC0 - IRQ_VIC1_BASE) | \ 1 << (IRQ_HSMMC1 - IRQ_VIC1_BASE) | \ 1 << (IRQ_HSMMC2 - IRQ_VIC1_BASE)) void __init s3c64xx_init_irq(u32 vic0_valid, u32 vic1_valid) { /* * FIXME: there is no better place to put this at the moment * (s3c64xx_clk_init needs ioremap and must happen before init_time * samsung_wdt_reset_init needs clocks) */ s3c64xx_clk_init(NULL, xtal_f, xusbxti_f, soc_is_s3c6400(), S3C_VA_SYS); samsung_wdt_reset_init(S3C_VA_WATCHDOG); printk(KERN_DEBUG "%s: initialising interrupts\n", __func__); /* initialise the pair of VICs */ vic_init(VA_VIC0, IRQ_VIC0_BASE, vic0_valid, IRQ_VIC0_RESUME); vic_init(VA_VIC1, IRQ_VIC1_BASE, vic1_valid, IRQ_VIC1_RESUME); } #define eint_offset(irq) ((irq) - IRQ_EINT(0)) #define eint_irq_to_bit(irq) ((u32)(1 << eint_offset(irq))) static inline void s3c_irq_eint_mask(struct irq_data *data) { u32 mask; mask = __raw_readl(S3C64XX_EINT0MASK); mask |= (u32)data->chip_data; __raw_writel(mask, S3C64XX_EINT0MASK); } static void s3c_irq_eint_unmask(struct irq_data *data) { u32 mask; mask = __raw_readl(S3C64XX_EINT0MASK); mask &= ~((u32)data->chip_data); __raw_writel(mask, S3C64XX_EINT0MASK); } static inline void s3c_irq_eint_ack(struct irq_data *data) { __raw_writel((u32)data->chip_data, S3C64XX_EINT0PEND); } static void s3c_irq_eint_maskack(struct irq_data *data) { /* compiler should in-line these */ s3c_irq_eint_mask(data); s3c_irq_eint_ack(data); } static int s3c_irq_eint_set_type(struct irq_data *data, unsigned int type) { int offs = eint_offset(data->irq); int pin, pin_val; int shift; u32 ctrl, mask; u32 newvalue = 0; void __iomem *reg; if (offs > 27) return -EINVAL; if (offs <= 15) reg = S3C64XX_EINT0CON0; else reg = S3C64XX_EINT0CON1; switch (type) { case IRQ_TYPE_NONE: printk(KERN_WARNING "No edge setting!\n"); break; case IRQ_TYPE_EDGE_RISING: newvalue = S3C2410_EXTINT_RISEEDGE; break; case IRQ_TYPE_EDGE_FALLING: newvalue = S3C2410_EXTINT_FALLEDGE; break; case IRQ_TYPE_EDGE_BOTH: newvalue = S3C2410_EXTINT_BOTHEDGE; break; case IRQ_TYPE_LEVEL_LOW: newvalue = S3C2410_EXTINT_LOWLEV; break; case IRQ_TYPE_LEVEL_HIGH: newvalue = S3C2410_EXTINT_HILEV; break; default: printk(KERN_ERR "No such irq type %d", type); return -1; } if (offs <= 15) shift = (offs / 2) * 4; else shift = ((offs - 16) / 2) * 4; mask = 0x7 << shift; ctrl = __raw_readl(reg); ctrl &= ~mask; ctrl |= newvalue << shift; __raw_writel(ctrl, reg); /* set the GPIO pin appropriately */ if (offs < 16) { pin = S3C64XX_GPN(offs); pin_val = S3C_GPIO_SFN(2); } else if (offs < 23) { pin = S3C64XX_GPL(offs + 8 - 16); pin_val = S3C_GPIO_SFN(3); } else { pin = S3C64XX_GPM(offs - 23); pin_val = S3C_GPIO_SFN(3); } s3c_gpio_cfgpin(pin, pin_val); return 0; } static struct irq_chip s3c_irq_eint = { .name = "s3c-eint", .irq_mask = s3c_irq_eint_mask, .irq_unmask = s3c_irq_eint_unmask, .irq_mask_ack = s3c_irq_eint_maskack, .irq_ack = s3c_irq_eint_ack, .irq_set_type = s3c_irq_eint_set_type, .irq_set_wake = s3c_irqext_wake, }; /* s3c_irq_demux_eint * * This function demuxes the IRQ from the group0 external interrupts, * from IRQ_EINT(0) to IRQ_EINT(27). It is designed to be inlined into * the specific handlers s3c_irq_demux_eintX_Y. */ static inline void s3c_irq_demux_eint(unsigned int start, unsigned int end) { u32 status = __raw_readl(S3C64XX_EINT0PEND); u32 mask = __raw_readl(S3C64XX_EINT0MASK); unsigned int irq; status &= ~mask; status >>= start; status &= (1 << (end - start + 1)) - 1; for (irq = IRQ_EINT(start); irq <= IRQ_EINT(end); irq++) { if (status & 1) generic_handle_irq(irq); status >>= 1; } } static void s3c_irq_demux_eint0_3(unsigned int irq, struct irq_desc *desc) { s3c_irq_demux_eint(0, 3); } static void s3c_irq_demux_eint4_11(unsigned int irq, struct irq_desc *desc) { s3c_irq_demux_eint(4, 11); } static void s3c_irq_demux_eint12_19(unsigned int irq, struct irq_desc *desc) { s3c_irq_demux_eint(12, 19); } static void s3c_irq_demux_eint20_27(unsigned int irq, struct irq_desc *desc) { s3c_irq_demux_eint(20, 27); } static int __init s3c64xx_init_irq_eint(void) { int irq; /* On DT-enabled systems EINTs are handled by pinctrl-s3c64xx driver. */ if (of_have_populated_dt()) return -ENODEV; for (irq = IRQ_EINT(0); irq <= IRQ_EINT(27); irq++) { irq_set_chip_and_handler(irq, &s3c_irq_eint, handle_level_irq); irq_set_chip_data(irq, (void *)eint_irq_to_bit(irq)); set_irq_flags(irq, IRQF_VALID); } irq_set_chained_handler(IRQ_EINT0_3, s3c_irq_demux_eint0_3); irq_set_chained_handler(IRQ_EINT4_11, s3c_irq_demux_eint4_11); irq_set_chained_handler(IRQ_EINT12_19, s3c_irq_demux_eint12_19); irq_set_chained_handler(IRQ_EINT20_27, s3c_irq_demux_eint20_27); return 0; } arch_initcall(s3c64xx_init_irq_eint); void s3c64xx_restart(enum reboot_mode mode, const char *cmd) { if (mode != REBOOT_SOFT) samsung_wdt_reset(); /* if all else fails, or mode was for soft, jump to 0 */ soft_restart(0); }