2 * arch/arm/mach-ep93xx/core.c
3 * Core routines for Cirrus EP93xx chips.
5 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
7 * Thanks go to Michael Burian and Ray Lehtiniemi for their key
8 * role in the ep93xx linux community.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
16 #include <linux/config.h>
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/spinlock.h>
20 #include <linux/sched.h>
21 #include <linux/interrupt.h>
22 #include <linux/serial.h>
23 #include <linux/tty.h>
24 #include <linux/bitops.h>
25 #include <linux/serial.h>
26 #include <linux/serial_8250.h>
27 #include <linux/serial_core.h>
28 #include <linux/device.h>
30 #include <linux/time.h>
31 #include <linux/timex.h>
32 #include <linux/delay.h>
33 #include <linux/termios.h>
34 #include <linux/amba/bus.h>
35 #include <linux/amba/serial.h>
37 #include <asm/types.h>
38 #include <asm/setup.h>
39 #include <asm/memory.h>
40 #include <asm/hardware.h>
42 #include <asm/system.h>
43 #include <asm/tlbflush.h>
44 #include <asm/pgtable.h>
47 #include <asm/mach/map.h>
48 #include <asm/mach/time.h>
49 #include <asm/mach/irq.h>
50 #include <asm/arch/gpio.h>
52 #include <asm/hardware/vic.h>
55 /*************************************************************************
56 * Static I/O mappings that are needed for all EP93xx platforms
57 *************************************************************************/
58 static struct map_desc ep93xx_io_desc[] __initdata = {
60 .virtual = EP93XX_AHB_VIRT_BASE,
61 .pfn = __phys_to_pfn(EP93XX_AHB_PHYS_BASE),
62 .length = EP93XX_AHB_SIZE,
65 .virtual = EP93XX_APB_VIRT_BASE,
66 .pfn = __phys_to_pfn(EP93XX_APB_PHYS_BASE),
67 .length = EP93XX_APB_SIZE,
72 void __init ep93xx_map_io(void)
74 iotable_init(ep93xx_io_desc, ARRAY_SIZE(ep93xx_io_desc));
78 /*************************************************************************
79 * Timer handling for EP93xx
80 *************************************************************************
81 * The ep93xx has four internal timers. Timers 1, 2 (both 16 bit) and
82 * 3 (32 bit) count down at 508 kHz, are self-reloading, and can generate
83 * an interrupt on underflow. Timer 4 (40 bit) counts down at 983.04 kHz,
84 * is free-running, and can't generate interrupts.
86 * The 508 kHz timers are ideal for use for the timer interrupt, as the
87 * most common values of HZ divide 508 kHz nicely. We pick one of the 16
88 * bit timers (timer 1) since we don't need more than 16 bits of reload
89 * value as long as HZ >= 8.
91 * The higher clock rate of timer 4 makes it a better choice than the
92 * other timers for use in gettimeoffset(), while the fact that it can't
93 * generate interrupts means we don't have to worry about not being able
94 * to use this timer for something else. We also use timer 4 for keeping
95 * track of lost jiffies.
97 static unsigned int last_jiffy_time;
99 #define TIMER4_TICKS_PER_JIFFY ((CLOCK_TICK_RATE + (HZ/2)) / HZ)
101 static int ep93xx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
103 write_seqlock(&xtime_lock);
105 __raw_writel(1, EP93XX_TIMER1_CLEAR);
107 (__raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time)
108 >= TIMER4_TICKS_PER_JIFFY) {
109 last_jiffy_time += TIMER4_TICKS_PER_JIFFY;
113 write_sequnlock(&xtime_lock);
118 static struct irqaction ep93xx_timer_irq = {
119 .name = "ep93xx timer",
120 .flags = SA_INTERRUPT | SA_TIMER,
121 .handler = ep93xx_timer_interrupt,
124 static void __init ep93xx_timer_init(void)
126 /* Enable periodic HZ timer. */
127 __raw_writel(0x48, EP93XX_TIMER1_CONTROL);
128 __raw_writel((508469 / HZ) - 1, EP93XX_TIMER1_LOAD);
129 __raw_writel(0xc8, EP93XX_TIMER1_CONTROL);
131 /* Enable lost jiffy timer. */
132 __raw_writel(0x100, EP93XX_TIMER4_VALUE_HIGH);
134 setup_irq(IRQ_EP93XX_TIMER1, &ep93xx_timer_irq);
137 static unsigned long ep93xx_gettimeoffset(void)
141 offset = __raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time;
143 /* Calculate (1000000 / 983040) * offset. */
144 return offset + (53 * offset / 3072);
147 struct sys_timer ep93xx_timer = {
148 .init = ep93xx_timer_init,
149 .offset = ep93xx_gettimeoffset,
153 /*************************************************************************
154 * GPIO handling for EP93xx
155 *************************************************************************/
156 static unsigned char gpio_int_enable[2];
157 static unsigned char gpio_int_type1[2];
158 static unsigned char gpio_int_type2[2];
160 static void update_gpio_ab_int_params(int port)
163 __raw_writeb(0, EP93XX_GPIO_A_INT_ENABLE);
164 __raw_writeb(gpio_int_type2[0], EP93XX_GPIO_A_INT_TYPE2);
165 __raw_writeb(gpio_int_type1[0], EP93XX_GPIO_A_INT_TYPE1);
166 __raw_writeb(gpio_int_enable[0], EP93XX_GPIO_A_INT_ENABLE);
167 } else if (port == 1) {
168 __raw_writeb(0, EP93XX_GPIO_B_INT_ENABLE);
169 __raw_writeb(gpio_int_type2[1], EP93XX_GPIO_B_INT_TYPE2);
170 __raw_writeb(gpio_int_type1[1], EP93XX_GPIO_B_INT_TYPE1);
171 __raw_writeb(gpio_int_enable[1], EP93XX_GPIO_B_INT_ENABLE);
176 static unsigned char data_register_offset[8] = {
177 0x00, 0x04, 0x08, 0x0c, 0x20, 0x30, 0x38, 0x40,
180 static unsigned char data_direction_register_offset[8] = {
181 0x10, 0x14, 0x18, 0x1c, 0x24, 0x34, 0x3c, 0x44,
184 void gpio_line_config(int line, int direction)
186 unsigned int data_direction_register;
190 data_direction_register =
191 EP93XX_GPIO_REG(data_direction_register_offset[line >> 3]);
193 local_irq_save(flags);
194 if (direction == GPIO_OUT) {
195 if (line >= 0 && line < 16) {
196 gpio_int_enable[line >> 3] &= ~(1 << (line & 7));
197 update_gpio_ab_int_params(line >> 3);
200 v = __raw_readb(data_direction_register);
201 v |= 1 << (line & 7);
202 __raw_writeb(v, data_direction_register);
203 } else if (direction == GPIO_IN) {
204 v = __raw_readb(data_direction_register);
205 v &= ~(1 << (line & 7));
206 __raw_writeb(v, data_direction_register);
208 local_irq_restore(flags);
210 EXPORT_SYMBOL(gpio_line_config);
212 int gpio_line_get(int line)
214 unsigned int data_register;
216 data_register = EP93XX_GPIO_REG(data_register_offset[line >> 3]);
218 return !!(__raw_readb(data_register) & (1 << (line & 7)));
220 EXPORT_SYMBOL(gpio_line_get);
222 void gpio_line_set(int line, int value)
224 unsigned int data_register;
228 data_register = EP93XX_GPIO_REG(data_register_offset[line >> 3]);
230 local_irq_save(flags);
231 if (value == EP93XX_GPIO_HIGH) {
232 v = __raw_readb(data_register);
233 v |= 1 << (line & 7);
234 __raw_writeb(v, data_register);
235 } else if (value == EP93XX_GPIO_LOW) {
236 v = __raw_readb(data_register);
237 v &= ~(1 << (line & 7));
238 __raw_writeb(v, data_register);
240 local_irq_restore(flags);
242 EXPORT_SYMBOL(gpio_line_set);
245 /*************************************************************************
246 * EP93xx IRQ handling
247 *************************************************************************/
248 static void ep93xx_gpio_ab_irq_handler(unsigned int irq,
249 struct irqdesc *desc, struct pt_regs *regs)
251 unsigned char status;
254 status = __raw_readb(EP93XX_GPIO_A_INT_STATUS);
255 for (i = 0; i < 8; i++) {
256 if (status & (1 << i)) {
257 desc = irq_desc + IRQ_EP93XX_GPIO(0) + i;
258 desc_handle_irq(IRQ_EP93XX_GPIO(0) + i, desc, regs);
262 status = __raw_readb(EP93XX_GPIO_B_INT_STATUS);
263 for (i = 0; i < 8; i++) {
264 if (status & (1 << i)) {
265 desc = irq_desc + IRQ_EP93XX_GPIO(8) + i;
266 desc_handle_irq(IRQ_EP93XX_GPIO(8) + i, desc, regs);
271 static void ep93xx_gpio_ab_irq_mask_ack(unsigned int irq)
273 int line = irq - IRQ_EP93XX_GPIO(0);
274 int port = line >> 3;
276 gpio_int_enable[port] &= ~(1 << (line & 7));
277 update_gpio_ab_int_params(port);
280 __raw_writel(1 << (line & 7), EP93XX_GPIO_B_INT_ACK);
282 __raw_writel(1 << (line & 7), EP93XX_GPIO_A_INT_ACK);
286 static void ep93xx_gpio_ab_irq_mask(unsigned int irq)
288 int line = irq - IRQ_EP93XX_GPIO(0);
289 int port = line >> 3;
291 gpio_int_enable[port] &= ~(1 << (line & 7));
292 update_gpio_ab_int_params(port);
295 static void ep93xx_gpio_ab_irq_unmask(unsigned int irq)
297 int line = irq - IRQ_EP93XX_GPIO(0);
298 int port = line >> 3;
300 gpio_int_enable[port] |= 1 << (line & 7);
301 update_gpio_ab_int_params(port);
306 * gpio_int_type1 controls whether the interrupt is level (0) or
307 * edge (1) triggered, while gpio_int_type2 controls whether it
308 * triggers on low/falling (0) or high/rising (1).
310 static int ep93xx_gpio_ab_irq_type(unsigned int irq, unsigned int type)
315 line = irq - IRQ_EP93XX_GPIO(0);
316 gpio_line_config(line, GPIO_IN);
321 if (type & IRQT_RISING) {
322 gpio_int_type1[port] |= 1 << line;
323 gpio_int_type2[port] |= 1 << line;
324 } else if (type & IRQT_FALLING) {
325 gpio_int_type1[port] |= 1 << line;
326 gpio_int_type2[port] &= ~(1 << line);
327 } else if (type & IRQT_HIGH) {
328 gpio_int_type1[port] &= ~(1 << line);
329 gpio_int_type2[port] |= 1 << line;
330 } else if (type & IRQT_LOW) {
331 gpio_int_type1[port] &= ~(1 << line);
332 gpio_int_type2[port] &= ~(1 << line);
334 update_gpio_ab_int_params(port);
339 static struct irqchip ep93xx_gpio_ab_irq_chip = {
340 .ack = ep93xx_gpio_ab_irq_mask_ack,
341 .mask = ep93xx_gpio_ab_irq_mask,
342 .unmask = ep93xx_gpio_ab_irq_unmask,
343 .set_type = ep93xx_gpio_ab_irq_type,
347 void __init ep93xx_init_irq(void)
351 vic_init((void *)EP93XX_VIC1_BASE, 0, EP93XX_VIC1_VALID_IRQ_MASK);
352 vic_init((void *)EP93XX_VIC2_BASE, 32, EP93XX_VIC2_VALID_IRQ_MASK);
354 for (irq = IRQ_EP93XX_GPIO(0) ; irq <= IRQ_EP93XX_GPIO(15); irq++) {
355 set_irq_chip(irq, &ep93xx_gpio_ab_irq_chip);
356 set_irq_handler(irq, do_level_IRQ);
357 set_irq_flags(irq, IRQF_VALID);
359 set_irq_chained_handler(IRQ_EP93XX_GPIO_AB, ep93xx_gpio_ab_irq_handler);
363 /*************************************************************************
364 * EP93xx peripheral handling
365 *************************************************************************/
366 #define EP93XX_UART_MCR_OFFSET (0x0100)
368 static void ep93xx_uart_set_mctrl(struct amba_device *dev,
369 void __iomem *base, unsigned int mctrl)
374 if (!(mctrl & TIOCM_RTS))
376 if (!(mctrl & TIOCM_DTR))
379 __raw_writel(mcr, base + EP93XX_UART_MCR_OFFSET);
382 static struct amba_pl010_data ep93xx_uart_data = {
383 .set_mctrl = ep93xx_uart_set_mctrl,
386 static struct amba_device uart1_device = {
388 .bus_id = "apb:uart1",
389 .platform_data = &ep93xx_uart_data,
392 .start = EP93XX_UART1_PHYS_BASE,
393 .end = EP93XX_UART1_PHYS_BASE + 0x0fff,
394 .flags = IORESOURCE_MEM,
396 .irq = { IRQ_EP93XX_UART1, NO_IRQ },
397 .periphid = 0x00041010,
400 static struct amba_device uart2_device = {
402 .bus_id = "apb:uart2",
403 .platform_data = &ep93xx_uart_data,
406 .start = EP93XX_UART2_PHYS_BASE,
407 .end = EP93XX_UART2_PHYS_BASE + 0x0fff,
408 .flags = IORESOURCE_MEM,
410 .irq = { IRQ_EP93XX_UART2, NO_IRQ },
411 .periphid = 0x00041010,
414 static struct amba_device uart3_device = {
416 .bus_id = "apb:uart3",
417 .platform_data = &ep93xx_uart_data,
420 .start = EP93XX_UART3_PHYS_BASE,
421 .end = EP93XX_UART3_PHYS_BASE + 0x0fff,
422 .flags = IORESOURCE_MEM,
424 .irq = { IRQ_EP93XX_UART3, NO_IRQ },
425 .periphid = 0x00041010,
429 static struct platform_device ep93xx_rtc_device = {
430 .name = "ep93xx-rtc",
436 static struct resource ep93xx_ohci_resources[] = {
438 .start = EP93XX_USB_PHYS_BASE,
439 .end = EP93XX_USB_PHYS_BASE + 0x0fff,
440 .flags = IORESOURCE_MEM,
443 .start = IRQ_EP93XX_USB,
444 .end = IRQ_EP93XX_USB,
445 .flags = IORESOURCE_IRQ,
449 static struct platform_device ep93xx_ohci_device = {
450 .name = "ep93xx-ohci",
453 .dma_mask = (void *)0xffffffff,
454 .coherent_dma_mask = 0xffffffff,
456 .num_resources = ARRAY_SIZE(ep93xx_ohci_resources),
457 .resource = ep93xx_ohci_resources,
461 void __init ep93xx_init_devices(void)
468 * Disallow access to MaverickCrunch initially.
470 v = __raw_readl(EP93XX_SYSCON_DEVICE_CONFIG);
471 v &= ~EP93XX_SYSCON_DEVICE_CONFIG_CRUNCH_ENABLE;
472 __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
473 __raw_writel(v, EP93XX_SYSCON_DEVICE_CONFIG);
475 amba_device_register(&uart1_device, &iomem_resource);
476 amba_device_register(&uart2_device, &iomem_resource);
477 amba_device_register(&uart3_device, &iomem_resource);
479 platform_device_register(&ep93xx_rtc_device);
480 platform_device_register(&ep93xx_ohci_device);