/* * arch/arm/mach-ep93xx/core.c * Core routines for Cirrus EP93xx chips. * * Copyright (C) 2006 Lennert Buytenhek * Copyright (C) 2007 Herbert Valerio Riedel * * Thanks go to Michael Burian and Ray Lehtiniemi for their key * role in the ep93xx linux community. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. */ #define pr_fmt(fmt) "ep93xx " KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /************************************************************************* * Static I/O mappings that are needed for all EP93xx platforms *************************************************************************/ static struct map_desc ep93xx_io_desc[] __initdata = { { .virtual = EP93XX_AHB_VIRT_BASE, .pfn = __phys_to_pfn(EP93XX_AHB_PHYS_BASE), .length = EP93XX_AHB_SIZE, .type = MT_DEVICE, }, { .virtual = EP93XX_APB_VIRT_BASE, .pfn = __phys_to_pfn(EP93XX_APB_PHYS_BASE), .length = EP93XX_APB_SIZE, .type = MT_DEVICE, }, }; void __init ep93xx_map_io(void) { iotable_init(ep93xx_io_desc, ARRAY_SIZE(ep93xx_io_desc)); } /************************************************************************* * Timer handling for EP93xx ************************************************************************* * The ep93xx has four internal timers. Timers 1, 2 (both 16 bit) and * 3 (32 bit) count down at 508 kHz, are self-reloading, and can generate * an interrupt on underflow. Timer 4 (40 bit) counts down at 983.04 kHz, * is free-running, and can't generate interrupts. * * The 508 kHz timers are ideal for use for the timer interrupt, as the * most common values of HZ divide 508 kHz nicely. We pick one of the 16 * bit timers (timer 1) since we don't need more than 16 bits of reload * value as long as HZ >= 8. * * The higher clock rate of timer 4 makes it a better choice than the * other timers for use in gettimeoffset(), while the fact that it can't * generate interrupts means we don't have to worry about not being able * to use this timer for something else. We also use timer 4 for keeping * track of lost jiffies. */ #define EP93XX_TIMER_REG(x) (EP93XX_TIMER_BASE + (x)) #define EP93XX_TIMER1_LOAD EP93XX_TIMER_REG(0x00) #define EP93XX_TIMER1_VALUE EP93XX_TIMER_REG(0x04) #define EP93XX_TIMER1_CONTROL EP93XX_TIMER_REG(0x08) #define EP93XX_TIMER123_CONTROL_ENABLE (1 << 7) #define EP93XX_TIMER123_CONTROL_MODE (1 << 6) #define EP93XX_TIMER123_CONTROL_CLKSEL (1 << 3) #define EP93XX_TIMER1_CLEAR EP93XX_TIMER_REG(0x0c) #define EP93XX_TIMER2_LOAD EP93XX_TIMER_REG(0x20) #define EP93XX_TIMER2_VALUE EP93XX_TIMER_REG(0x24) #define EP93XX_TIMER2_CONTROL EP93XX_TIMER_REG(0x28) #define EP93XX_TIMER2_CLEAR EP93XX_TIMER_REG(0x2c) #define EP93XX_TIMER4_VALUE_LOW EP93XX_TIMER_REG(0x60) #define EP93XX_TIMER4_VALUE_HIGH EP93XX_TIMER_REG(0x64) #define EP93XX_TIMER4_VALUE_HIGH_ENABLE (1 << 8) #define EP93XX_TIMER3_LOAD EP93XX_TIMER_REG(0x80) #define EP93XX_TIMER3_VALUE EP93XX_TIMER_REG(0x84) #define EP93XX_TIMER3_CONTROL EP93XX_TIMER_REG(0x88) #define EP93XX_TIMER3_CLEAR EP93XX_TIMER_REG(0x8c) #define EP93XX_TIMER123_CLOCK 508469 #define EP93XX_TIMER4_CLOCK 983040 #define TIMER1_RELOAD ((EP93XX_TIMER123_CLOCK / HZ) - 1) #define TIMER4_TICKS_PER_JIFFY DIV_ROUND_CLOSEST(CLOCK_TICK_RATE, HZ) static unsigned int last_jiffy_time; static irqreturn_t ep93xx_timer_interrupt(int irq, void *dev_id) { /* Writing any value clears the timer interrupt */ __raw_writel(1, EP93XX_TIMER1_CLEAR); /* Recover lost jiffies */ while ((signed long) (__raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time) >= TIMER4_TICKS_PER_JIFFY) { last_jiffy_time += TIMER4_TICKS_PER_JIFFY; timer_tick(); } return IRQ_HANDLED; } static struct irqaction ep93xx_timer_irq = { .name = "ep93xx timer", .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, .handler = ep93xx_timer_interrupt, }; static void __init ep93xx_timer_init(void) { u32 tmode = EP93XX_TIMER123_CONTROL_MODE | EP93XX_TIMER123_CONTROL_CLKSEL; /* Enable periodic HZ timer. */ __raw_writel(tmode, EP93XX_TIMER1_CONTROL); __raw_writel(TIMER1_RELOAD, EP93XX_TIMER1_LOAD); __raw_writel(tmode | EP93XX_TIMER123_CONTROL_ENABLE, EP93XX_TIMER1_CONTROL); /* Enable lost jiffy timer. */ __raw_writel(EP93XX_TIMER4_VALUE_HIGH_ENABLE, EP93XX_TIMER4_VALUE_HIGH); setup_irq(IRQ_EP93XX_TIMER1, &ep93xx_timer_irq); } static unsigned long ep93xx_gettimeoffset(void) { int offset; offset = __raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time; /* Calculate (1000000 / 983040) * offset. */ return offset + (53 * offset / 3072); } struct sys_timer ep93xx_timer = { .init = ep93xx_timer_init, .offset = ep93xx_gettimeoffset, }; /************************************************************************* * EP93xx IRQ handling *************************************************************************/ extern void ep93xx_gpio_init_irq(void); void __init ep93xx_init_irq(void) { vic_init(EP93XX_VIC1_BASE, 0, EP93XX_VIC1_VALID_IRQ_MASK, 0); vic_init(EP93XX_VIC2_BASE, 32, EP93XX_VIC2_VALID_IRQ_MASK, 0); ep93xx_gpio_init_irq(); } /************************************************************************* * EP93xx System Controller Software Locked register handling *************************************************************************/ /* * syscon_swlock prevents anything else from writing to the syscon * block while a software locked register is being written. */ static DEFINE_SPINLOCK(syscon_swlock); void ep93xx_syscon_swlocked_write(unsigned int val, void __iomem *reg) { unsigned long flags; spin_lock_irqsave(&syscon_swlock, flags); __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK); __raw_writel(val, reg); spin_unlock_irqrestore(&syscon_swlock, flags); } EXPORT_SYMBOL(ep93xx_syscon_swlocked_write); void ep93xx_devcfg_set_clear(unsigned int set_bits, unsigned int clear_bits) { unsigned long flags; unsigned int val; spin_lock_irqsave(&syscon_swlock, flags); val = __raw_readl(EP93XX_SYSCON_DEVCFG); val |= set_bits; val &= ~clear_bits; __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK); __raw_writel(val, EP93XX_SYSCON_DEVCFG); spin_unlock_irqrestore(&syscon_swlock, flags); } EXPORT_SYMBOL(ep93xx_devcfg_set_clear); /************************************************************************* * EP93xx peripheral handling *************************************************************************/ #define EP93XX_UART_MCR_OFFSET (0x0100) static void ep93xx_uart_set_mctrl(struct amba_device *dev, void __iomem *base, unsigned int mctrl) { unsigned int mcr; mcr = 0; if (!(mctrl & TIOCM_RTS)) mcr |= 2; if (!(mctrl & TIOCM_DTR)) mcr |= 1; __raw_writel(mcr, base + EP93XX_UART_MCR_OFFSET); } static struct amba_pl010_data ep93xx_uart_data = { .set_mctrl = ep93xx_uart_set_mctrl, }; static struct amba_device uart1_device = { .dev = { .init_name = "apb:uart1", .platform_data = &ep93xx_uart_data, }, .res = { .start = EP93XX_UART1_PHYS_BASE, .end = EP93XX_UART1_PHYS_BASE + 0x0fff, .flags = IORESOURCE_MEM, }, .irq = { IRQ_EP93XX_UART1, NO_IRQ }, .periphid = 0x00041010, }; static struct amba_device uart2_device = { .dev = { .init_name = "apb:uart2", .platform_data = &ep93xx_uart_data, }, .res = { .start = EP93XX_UART2_PHYS_BASE, .end = EP93XX_UART2_PHYS_BASE + 0x0fff, .flags = IORESOURCE_MEM, }, .irq = { IRQ_EP93XX_UART2, NO_IRQ }, .periphid = 0x00041010, }; static struct amba_device uart3_device = { .dev = { .init_name = "apb:uart3", .platform_data = &ep93xx_uart_data, }, .res = { .start = EP93XX_UART3_PHYS_BASE, .end = EP93XX_UART3_PHYS_BASE + 0x0fff, .flags = IORESOURCE_MEM, }, .irq = { IRQ_EP93XX_UART3, NO_IRQ }, .periphid = 0x00041010, }; static struct resource ep93xx_rtc_resource[] = { { .start = EP93XX_RTC_PHYS_BASE, .end = EP93XX_RTC_PHYS_BASE + 0x10c - 1, .flags = IORESOURCE_MEM, }, }; static struct platform_device ep93xx_rtc_device = { .name = "ep93xx-rtc", .id = -1, .num_resources = ARRAY_SIZE(ep93xx_rtc_resource), .resource = ep93xx_rtc_resource, }; static struct resource ep93xx_ohci_resources[] = { [0] = { .start = EP93XX_USB_PHYS_BASE, .end = EP93XX_USB_PHYS_BASE + 0x0fff, .flags = IORESOURCE_MEM, }, [1] = { .start = IRQ_EP93XX_USB, .end = IRQ_EP93XX_USB, .flags = IORESOURCE_IRQ, }, }; static struct platform_device ep93xx_ohci_device = { .name = "ep93xx-ohci", .id = -1, .dev = { .dma_mask = &ep93xx_ohci_device.dev.coherent_dma_mask, .coherent_dma_mask = DMA_BIT_MASK(32), }, .num_resources = ARRAY_SIZE(ep93xx_ohci_resources), .resource = ep93xx_ohci_resources, }; /************************************************************************* * EP93xx ethernet peripheral handling *************************************************************************/ static struct ep93xx_eth_data ep93xx_eth_data; static struct resource ep93xx_eth_resource[] = { { .start = EP93XX_ETHERNET_PHYS_BASE, .end = EP93XX_ETHERNET_PHYS_BASE + 0xffff, .flags = IORESOURCE_MEM, }, { .start = IRQ_EP93XX_ETHERNET, .end = IRQ_EP93XX_ETHERNET, .flags = IORESOURCE_IRQ, } }; static struct platform_device ep93xx_eth_device = { .name = "ep93xx-eth", .id = -1, .dev = { .platform_data = &ep93xx_eth_data, }, .num_resources = ARRAY_SIZE(ep93xx_eth_resource), .resource = ep93xx_eth_resource, }; /** * ep93xx_register_eth - Register the built-in ethernet platform device. * @data: platform specific ethernet configuration (__initdata) * @copy_addr: flag indicating that the MAC address should be copied * from the IndAd registers (as programmed by the bootloader) */ void __init ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr) { if (copy_addr) memcpy_fromio(data->dev_addr, EP93XX_ETHERNET_BASE + 0x50, 6); ep93xx_eth_data = *data; platform_device_register(&ep93xx_eth_device); } /************************************************************************* * EP93xx i2c peripheral handling *************************************************************************/ static struct i2c_gpio_platform_data ep93xx_i2c_data; static struct platform_device ep93xx_i2c_device = { .name = "i2c-gpio", .id = 0, .dev = { .platform_data = &ep93xx_i2c_data, }, }; /** * ep93xx_register_i2c - Register the i2c platform device. * @data: platform specific i2c-gpio configuration (__initdata) * @devices: platform specific i2c bus device information (__initdata) * @num: the number of devices on the i2c bus */ void __init ep93xx_register_i2c(struct i2c_gpio_platform_data *data, struct i2c_board_info *devices, int num) { /* * Set the EEPROM interface pin drive type control. * Defines the driver type for the EECLK and EEDAT pins as either * open drain, which will require an external pull-up, or a normal * CMOS driver. */ if (data->sda_is_open_drain && data->sda_pin != EP93XX_GPIO_LINE_EEDAT) pr_warning("sda != EEDAT, open drain has no effect\n"); if (data->scl_is_open_drain && data->scl_pin != EP93XX_GPIO_LINE_EECLK) pr_warning("scl != EECLK, open drain has no effect\n"); __raw_writel((data->sda_is_open_drain << 1) | (data->scl_is_open_drain << 0), EP93XX_GPIO_EEDRIVE); ep93xx_i2c_data = *data; i2c_register_board_info(0, devices, num); platform_device_register(&ep93xx_i2c_device); } /************************************************************************* * EP93xx LEDs *************************************************************************/ static struct gpio_led ep93xx_led_pins[] = { { .name = "platform:grled", .gpio = EP93XX_GPIO_LINE_GRLED, }, { .name = "platform:rdled", .gpio = EP93XX_GPIO_LINE_RDLED, }, }; static struct gpio_led_platform_data ep93xx_led_data = { .num_leds = ARRAY_SIZE(ep93xx_led_pins), .leds = ep93xx_led_pins, }; static struct platform_device ep93xx_leds = { .name = "leds-gpio", .id = -1, .dev = { .platform_data = &ep93xx_led_data, }, }; /************************************************************************* * EP93xx pwm peripheral handling *************************************************************************/ static struct resource ep93xx_pwm0_resource[] = { { .start = EP93XX_PWM_PHYS_BASE, .end = EP93XX_PWM_PHYS_BASE + 0x10 - 1, .flags = IORESOURCE_MEM, }, }; static struct platform_device ep93xx_pwm0_device = { .name = "ep93xx-pwm", .id = 0, .num_resources = ARRAY_SIZE(ep93xx_pwm0_resource), .resource = ep93xx_pwm0_resource, }; static struct resource ep93xx_pwm1_resource[] = { { .start = EP93XX_PWM_PHYS_BASE + 0x20, .end = EP93XX_PWM_PHYS_BASE + 0x30 - 1, .flags = IORESOURCE_MEM, }, }; static struct platform_device ep93xx_pwm1_device = { .name = "ep93xx-pwm", .id = 1, .num_resources = ARRAY_SIZE(ep93xx_pwm1_resource), .resource = ep93xx_pwm1_resource, }; void __init ep93xx_register_pwm(int pwm0, int pwm1) { if (pwm0) platform_device_register(&ep93xx_pwm0_device); /* NOTE: EP9307 does not have PWMOUT1 (pin EGPIO14) */ if (pwm1) platform_device_register(&ep93xx_pwm1_device); } int ep93xx_pwm_acquire_gpio(struct platform_device *pdev) { int err; if (pdev->id == 0) { err = 0; } else if (pdev->id == 1) { err = gpio_request(EP93XX_GPIO_LINE_EGPIO14, dev_name(&pdev->dev)); if (err) return err; err = gpio_direction_output(EP93XX_GPIO_LINE_EGPIO14, 0); if (err) goto fail; /* PWM 1 output on EGPIO[14] */ ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_PONG); } else { err = -ENODEV; } return err; fail: gpio_free(EP93XX_GPIO_LINE_EGPIO14); return err; } EXPORT_SYMBOL(ep93xx_pwm_acquire_gpio); void ep93xx_pwm_release_gpio(struct platform_device *pdev) { if (pdev->id == 1) { gpio_direction_input(EP93XX_GPIO_LINE_EGPIO14); gpio_free(EP93XX_GPIO_LINE_EGPIO14); /* EGPIO[14] used for GPIO */ ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_PONG); } } EXPORT_SYMBOL(ep93xx_pwm_release_gpio); /************************************************************************* * EP93xx video peripheral handling *************************************************************************/ static struct ep93xxfb_mach_info ep93xxfb_data; static struct resource ep93xx_fb_resource[] = { { .start = EP93XX_RASTER_PHYS_BASE, .end = EP93XX_RASTER_PHYS_BASE + 0x800 - 1, .flags = IORESOURCE_MEM, }, }; static struct platform_device ep93xx_fb_device = { .name = "ep93xx-fb", .id = -1, .dev = { .platform_data = &ep93xxfb_data, .coherent_dma_mask = DMA_BIT_MASK(32), .dma_mask = &ep93xx_fb_device.dev.coherent_dma_mask, }, .num_resources = ARRAY_SIZE(ep93xx_fb_resource), .resource = ep93xx_fb_resource, }; /** * ep93xx_register_fb - Register the framebuffer platform device. * @data: platform specific framebuffer configuration (__initdata) */ void __init ep93xx_register_fb(struct ep93xxfb_mach_info *data) { ep93xxfb_data = *data; platform_device_register(&ep93xx_fb_device); } /************************************************************************* * EP93xx matrix keypad peripheral handling *************************************************************************/ static struct ep93xx_keypad_platform_data ep93xx_keypad_data; static struct resource ep93xx_keypad_resource[] = { { .start = EP93XX_KEY_MATRIX_PHYS_BASE, .end = EP93XX_KEY_MATRIX_PHYS_BASE + 0x0c - 1, .flags = IORESOURCE_MEM, }, { .start = IRQ_EP93XX_KEY, .end = IRQ_EP93XX_KEY, .flags = IORESOURCE_IRQ, }, }; static struct platform_device ep93xx_keypad_device = { .name = "ep93xx-keypad", .id = -1, .dev = { .platform_data = &ep93xx_keypad_data, }, .num_resources = ARRAY_SIZE(ep93xx_keypad_resource), .resource = ep93xx_keypad_resource, }; /** * ep93xx_register_keypad - Register the keypad platform device. * @data: platform specific keypad configuration (__initdata) */ void __init ep93xx_register_keypad(struct ep93xx_keypad_platform_data *data) { ep93xx_keypad_data = *data; platform_device_register(&ep93xx_keypad_device); } int ep93xx_keypad_acquire_gpio(struct platform_device *pdev) { int err; int i; for (i = 0; i < 8; i++) { err = gpio_request(EP93XX_GPIO_LINE_C(i), dev_name(&pdev->dev)); if (err) goto fail_gpio_c; err = gpio_request(EP93XX_GPIO_LINE_D(i), dev_name(&pdev->dev)); if (err) goto fail_gpio_d; } /* Enable the keypad controller; GPIO ports C and D used for keypad */ ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_KEYS | EP93XX_SYSCON_DEVCFG_GONK); return 0; fail_gpio_d: gpio_free(EP93XX_GPIO_LINE_C(i)); fail_gpio_c: for ( ; i >= 0; --i) { gpio_free(EP93XX_GPIO_LINE_C(i)); gpio_free(EP93XX_GPIO_LINE_D(i)); } return err; } EXPORT_SYMBOL(ep93xx_keypad_acquire_gpio); void ep93xx_keypad_release_gpio(struct platform_device *pdev) { int i; for (i = 0; i < 8; i++) { gpio_free(EP93XX_GPIO_LINE_C(i)); gpio_free(EP93XX_GPIO_LINE_D(i)); } /* Disable the keypad controller; GPIO ports C and D used for GPIO */ ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS | EP93XX_SYSCON_DEVCFG_GONK); } EXPORT_SYMBOL(ep93xx_keypad_release_gpio); extern void ep93xx_gpio_init(void); void __init ep93xx_init_devices(void) { /* Disallow access to MaverickCrunch initially */ ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_CPENA); ep93xx_gpio_init(); amba_device_register(&uart1_device, &iomem_resource); amba_device_register(&uart2_device, &iomem_resource); amba_device_register(&uart3_device, &iomem_resource); platform_device_register(&ep93xx_rtc_device); platform_device_register(&ep93xx_ohci_device); platform_device_register(&ep93xx_leds); }