2 * arch/arm/mach-ep93xx/core.c
3 * Core routines for Cirrus EP93xx chips.
5 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
6 * Copyright (C) 2007 Herbert Valerio Riedel <hvr@gnu.org>
8 * Thanks go to Michael Burian and Ray Lehtiniemi for their key
9 * role in the ep93xx linux community.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
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_8250.h>
26 #include <linux/serial_core.h>
27 #include <linux/device.h>
29 #include <linux/time.h>
30 #include <linux/timex.h>
31 #include <linux/delay.h>
32 #include <linux/termios.h>
33 #include <linux/amba/bus.h>
34 #include <linux/amba/serial.h>
37 #include <asm/types.h>
38 #include <asm/setup.h>
39 #include <asm/memory.h>
40 #include <mach/hardware.h>
42 #include <asm/system.h>
43 #include <asm/tlbflush.h>
44 #include <asm/pgtable.h>
46 #include <asm/mach/map.h>
47 #include <asm/mach/time.h>
48 #include <asm/mach/irq.h>
49 #include <mach/gpio.h>
51 #include <asm/hardware/vic.h>
54 /*************************************************************************
55 * Static I/O mappings that are needed for all EP93xx platforms
56 *************************************************************************/
57 static struct map_desc ep93xx_io_desc[] __initdata = {
59 .virtual = EP93XX_AHB_VIRT_BASE,
60 .pfn = __phys_to_pfn(EP93XX_AHB_PHYS_BASE),
61 .length = EP93XX_AHB_SIZE,
64 .virtual = EP93XX_APB_VIRT_BASE,
65 .pfn = __phys_to_pfn(EP93XX_APB_PHYS_BASE),
66 .length = EP93XX_APB_SIZE,
71 void __init ep93xx_map_io(void)
73 iotable_init(ep93xx_io_desc, ARRAY_SIZE(ep93xx_io_desc));
77 /*************************************************************************
78 * Timer handling for EP93xx
79 *************************************************************************
80 * The ep93xx has four internal timers. Timers 1, 2 (both 16 bit) and
81 * 3 (32 bit) count down at 508 kHz, are self-reloading, and can generate
82 * an interrupt on underflow. Timer 4 (40 bit) counts down at 983.04 kHz,
83 * is free-running, and can't generate interrupts.
85 * The 508 kHz timers are ideal for use for the timer interrupt, as the
86 * most common values of HZ divide 508 kHz nicely. We pick one of the 16
87 * bit timers (timer 1) since we don't need more than 16 bits of reload
88 * value as long as HZ >= 8.
90 * The higher clock rate of timer 4 makes it a better choice than the
91 * other timers for use in gettimeoffset(), while the fact that it can't
92 * generate interrupts means we don't have to worry about not being able
93 * to use this timer for something else. We also use timer 4 for keeping
94 * track of lost jiffies.
96 static unsigned int last_jiffy_time;
98 #define TIMER4_TICKS_PER_JIFFY ((CLOCK_TICK_RATE + (HZ/2)) / HZ)
100 static int ep93xx_timer_interrupt(int irq, void *dev_id)
102 __raw_writel(1, EP93XX_TIMER1_CLEAR);
104 (__raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time)
105 >= TIMER4_TICKS_PER_JIFFY) {
106 last_jiffy_time += TIMER4_TICKS_PER_JIFFY;
113 static struct irqaction ep93xx_timer_irq = {
114 .name = "ep93xx timer",
115 .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
116 .handler = ep93xx_timer_interrupt,
119 static void __init ep93xx_timer_init(void)
121 /* Enable periodic HZ timer. */
122 __raw_writel(0x48, EP93XX_TIMER1_CONTROL);
123 __raw_writel((508469 / HZ) - 1, EP93XX_TIMER1_LOAD);
124 __raw_writel(0xc8, EP93XX_TIMER1_CONTROL);
126 /* Enable lost jiffy timer. */
127 __raw_writel(0x100, EP93XX_TIMER4_VALUE_HIGH);
129 setup_irq(IRQ_EP93XX_TIMER1, &ep93xx_timer_irq);
132 static unsigned long ep93xx_gettimeoffset(void)
136 offset = __raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time;
138 /* Calculate (1000000 / 983040) * offset. */
139 return offset + (53 * offset / 3072);
142 struct sys_timer ep93xx_timer = {
143 .init = ep93xx_timer_init,
144 .offset = ep93xx_gettimeoffset,
148 /*************************************************************************
149 * GPIO handling for EP93xx
150 *************************************************************************/
151 static unsigned char gpio_int_unmasked[3];
152 static unsigned char gpio_int_enabled[3];
153 static unsigned char gpio_int_type1[3];
154 static unsigned char gpio_int_type2[3];
156 /* Port ordering is: A B F */
157 static const u8 int_type1_register_offset[3] = { 0x90, 0xac, 0x4c };
158 static const u8 int_type2_register_offset[3] = { 0x94, 0xb0, 0x50 };
159 static const u8 eoi_register_offset[3] = { 0x98, 0xb4, 0x54 };
160 static const u8 int_en_register_offset[3] = { 0x9c, 0xb8, 0x58 };
162 void ep93xx_gpio_update_int_params(unsigned port)
166 __raw_writeb(0, EP93XX_GPIO_REG(int_en_register_offset[port]));
168 __raw_writeb(gpio_int_type2[port],
169 EP93XX_GPIO_REG(int_type2_register_offset[port]));
171 __raw_writeb(gpio_int_type1[port],
172 EP93XX_GPIO_REG(int_type1_register_offset[port]));
174 __raw_writeb(gpio_int_unmasked[port] & gpio_int_enabled[port],
175 EP93XX_GPIO_REG(int_en_register_offset[port]));
178 void ep93xx_gpio_int_mask(unsigned line)
180 gpio_int_unmasked[line >> 3] &= ~(1 << (line & 7));
183 /*************************************************************************
184 * EP93xx IRQ handling
185 *************************************************************************/
186 static void ep93xx_gpio_ab_irq_handler(unsigned int irq, struct irq_desc *desc)
188 unsigned char status;
191 status = __raw_readb(EP93XX_GPIO_A_INT_STATUS);
192 for (i = 0; i < 8; i++) {
193 if (status & (1 << i)) {
194 int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_A(0)) + i;
195 generic_handle_irq(gpio_irq);
199 status = __raw_readb(EP93XX_GPIO_B_INT_STATUS);
200 for (i = 0; i < 8; i++) {
201 if (status & (1 << i)) {
202 int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_B(0)) + i;
203 desc = irq_desc + gpio_irq;
204 generic_handle_irq(gpio_irq);
209 static void ep93xx_gpio_f_irq_handler(unsigned int irq, struct irq_desc *desc)
212 * map discontiguous hw irq range to continous sw irq range:
214 * IRQ_EP93XX_GPIO{0..7}MUX -> gpio_to_irq(EP93XX_GPIO_LINE_F({0..7})
216 int port_f_idx = ((irq + 1) & 7) ^ 4; /* {19..22,47..50} -> {0..7} */
217 int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_F(0)) + port_f_idx;
219 generic_handle_irq(gpio_irq);
222 static void ep93xx_gpio_irq_ack(unsigned int irq)
224 int line = irq_to_gpio(irq);
225 int port = line >> 3;
226 int port_mask = 1 << (line & 7);
228 if ((irq_desc[irq].status & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
229 gpio_int_type2[port] ^= port_mask; /* switch edge direction */
230 ep93xx_gpio_update_int_params(port);
233 __raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
236 static void ep93xx_gpio_irq_mask_ack(unsigned int irq)
238 int line = irq_to_gpio(irq);
239 int port = line >> 3;
240 int port_mask = 1 << (line & 7);
242 if ((irq_desc[irq].status & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
243 gpio_int_type2[port] ^= port_mask; /* switch edge direction */
245 gpio_int_unmasked[port] &= ~port_mask;
246 ep93xx_gpio_update_int_params(port);
248 __raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
251 static void ep93xx_gpio_irq_mask(unsigned int irq)
253 int line = irq_to_gpio(irq);
254 int port = line >> 3;
256 gpio_int_unmasked[port] &= ~(1 << (line & 7));
257 ep93xx_gpio_update_int_params(port);
260 static void ep93xx_gpio_irq_unmask(unsigned int irq)
262 int line = irq_to_gpio(irq);
263 int port = line >> 3;
265 gpio_int_unmasked[port] |= 1 << (line & 7);
266 ep93xx_gpio_update_int_params(port);
271 * gpio_int_type1 controls whether the interrupt is level (0) or
272 * edge (1) triggered, while gpio_int_type2 controls whether it
273 * triggers on low/falling (0) or high/rising (1).
275 static int ep93xx_gpio_irq_type(unsigned int irq, unsigned int type)
277 struct irq_desc *desc = irq_desc + irq;
278 const int gpio = irq_to_gpio(irq);
279 const int port = gpio >> 3;
280 const int port_mask = 1 << (gpio & 7);
282 gpio_direction_input(gpio);
285 case IRQ_TYPE_EDGE_RISING:
286 gpio_int_type1[port] |= port_mask;
287 gpio_int_type2[port] |= port_mask;
288 desc->handle_irq = handle_edge_irq;
290 case IRQ_TYPE_EDGE_FALLING:
291 gpio_int_type1[port] |= port_mask;
292 gpio_int_type2[port] &= ~port_mask;
293 desc->handle_irq = handle_edge_irq;
295 case IRQ_TYPE_LEVEL_HIGH:
296 gpio_int_type1[port] &= ~port_mask;
297 gpio_int_type2[port] |= port_mask;
298 desc->handle_irq = handle_level_irq;
300 case IRQ_TYPE_LEVEL_LOW:
301 gpio_int_type1[port] &= ~port_mask;
302 gpio_int_type2[port] &= ~port_mask;
303 desc->handle_irq = handle_level_irq;
305 case IRQ_TYPE_EDGE_BOTH:
306 gpio_int_type1[port] |= port_mask;
307 /* set initial polarity based on current input level */
308 if (gpio_get_value(gpio))
309 gpio_int_type2[port] &= ~port_mask; /* falling */
311 gpio_int_type2[port] |= port_mask; /* rising */
312 desc->handle_irq = handle_edge_irq;
315 pr_err("ep93xx: failed to set irq type %d for gpio %d\n",
320 gpio_int_enabled[port] |= port_mask;
322 desc->status &= ~IRQ_TYPE_SENSE_MASK;
323 desc->status |= type & IRQ_TYPE_SENSE_MASK;
325 ep93xx_gpio_update_int_params(port);
330 static struct irq_chip ep93xx_gpio_irq_chip = {
332 .ack = ep93xx_gpio_irq_ack,
333 .mask_ack = ep93xx_gpio_irq_mask_ack,
334 .mask = ep93xx_gpio_irq_mask,
335 .unmask = ep93xx_gpio_irq_unmask,
336 .set_type = ep93xx_gpio_irq_type,
340 void __init ep93xx_init_irq(void)
344 vic_init((void *)EP93XX_VIC1_BASE, 0, EP93XX_VIC1_VALID_IRQ_MASK);
345 vic_init((void *)EP93XX_VIC2_BASE, 32, EP93XX_VIC2_VALID_IRQ_MASK);
347 for (gpio_irq = gpio_to_irq(0);
348 gpio_irq <= gpio_to_irq(EP93XX_GPIO_LINE_MAX_IRQ); ++gpio_irq) {
349 set_irq_chip(gpio_irq, &ep93xx_gpio_irq_chip);
350 set_irq_handler(gpio_irq, handle_level_irq);
351 set_irq_flags(gpio_irq, IRQF_VALID);
354 set_irq_chained_handler(IRQ_EP93XX_GPIO_AB, ep93xx_gpio_ab_irq_handler);
355 set_irq_chained_handler(IRQ_EP93XX_GPIO0MUX, ep93xx_gpio_f_irq_handler);
356 set_irq_chained_handler(IRQ_EP93XX_GPIO1MUX, ep93xx_gpio_f_irq_handler);
357 set_irq_chained_handler(IRQ_EP93XX_GPIO2MUX, ep93xx_gpio_f_irq_handler);
358 set_irq_chained_handler(IRQ_EP93XX_GPIO3MUX, ep93xx_gpio_f_irq_handler);
359 set_irq_chained_handler(IRQ_EP93XX_GPIO4MUX, ep93xx_gpio_f_irq_handler);
360 set_irq_chained_handler(IRQ_EP93XX_GPIO5MUX, ep93xx_gpio_f_irq_handler);
361 set_irq_chained_handler(IRQ_EP93XX_GPIO6MUX, ep93xx_gpio_f_irq_handler);
362 set_irq_chained_handler(IRQ_EP93XX_GPIO7MUX, ep93xx_gpio_f_irq_handler);
366 /*************************************************************************
367 * EP93xx peripheral handling
368 *************************************************************************/
369 #define EP93XX_UART_MCR_OFFSET (0x0100)
371 static void ep93xx_uart_set_mctrl(struct amba_device *dev,
372 void __iomem *base, unsigned int mctrl)
377 if (!(mctrl & TIOCM_RTS))
379 if (!(mctrl & TIOCM_DTR))
382 __raw_writel(mcr, base + EP93XX_UART_MCR_OFFSET);
385 static struct amba_pl010_data ep93xx_uart_data = {
386 .set_mctrl = ep93xx_uart_set_mctrl,
389 static struct amba_device uart1_device = {
391 .bus_id = "apb:uart1",
392 .platform_data = &ep93xx_uart_data,
395 .start = EP93XX_UART1_PHYS_BASE,
396 .end = EP93XX_UART1_PHYS_BASE + 0x0fff,
397 .flags = IORESOURCE_MEM,
399 .irq = { IRQ_EP93XX_UART1, NO_IRQ },
400 .periphid = 0x00041010,
403 static struct amba_device uart2_device = {
405 .bus_id = "apb:uart2",
406 .platform_data = &ep93xx_uart_data,
409 .start = EP93XX_UART2_PHYS_BASE,
410 .end = EP93XX_UART2_PHYS_BASE + 0x0fff,
411 .flags = IORESOURCE_MEM,
413 .irq = { IRQ_EP93XX_UART2, NO_IRQ },
414 .periphid = 0x00041010,
417 static struct amba_device uart3_device = {
419 .bus_id = "apb:uart3",
420 .platform_data = &ep93xx_uart_data,
423 .start = EP93XX_UART3_PHYS_BASE,
424 .end = EP93XX_UART3_PHYS_BASE + 0x0fff,
425 .flags = IORESOURCE_MEM,
427 .irq = { IRQ_EP93XX_UART3, NO_IRQ },
428 .periphid = 0x00041010,
432 static struct platform_device ep93xx_rtc_device = {
433 .name = "ep93xx-rtc",
439 static struct resource ep93xx_ohci_resources[] = {
441 .start = EP93XX_USB_PHYS_BASE,
442 .end = EP93XX_USB_PHYS_BASE + 0x0fff,
443 .flags = IORESOURCE_MEM,
446 .start = IRQ_EP93XX_USB,
447 .end = IRQ_EP93XX_USB,
448 .flags = IORESOURCE_IRQ,
452 static struct platform_device ep93xx_ohci_device = {
453 .name = "ep93xx-ohci",
456 .dma_mask = (void *)0xffffffff,
457 .coherent_dma_mask = 0xffffffff,
459 .num_resources = ARRAY_SIZE(ep93xx_ohci_resources),
460 .resource = ep93xx_ohci_resources,
463 static struct ep93xx_eth_data ep93xx_eth_data;
465 static struct resource ep93xx_eth_resource[] = {
467 .start = EP93XX_ETHERNET_PHYS_BASE,
468 .end = EP93XX_ETHERNET_PHYS_BASE + 0xffff,
469 .flags = IORESOURCE_MEM,
471 .start = IRQ_EP93XX_ETHERNET,
472 .end = IRQ_EP93XX_ETHERNET,
473 .flags = IORESOURCE_IRQ,
477 static struct platform_device ep93xx_eth_device = {
478 .name = "ep93xx-eth",
481 .platform_data = &ep93xx_eth_data,
483 .num_resources = ARRAY_SIZE(ep93xx_eth_resource),
484 .resource = ep93xx_eth_resource,
487 void __init ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr)
490 memcpy(data->dev_addr,
491 (void *)(EP93XX_ETHERNET_BASE + 0x50), 6);
494 ep93xx_eth_data = *data;
495 platform_device_register(&ep93xx_eth_device);
498 extern void ep93xx_gpio_init(void);
500 void __init ep93xx_init_devices(void)
505 * Disallow access to MaverickCrunch initially.
507 v = __raw_readl(EP93XX_SYSCON_DEVICE_CONFIG);
508 v &= ~EP93XX_SYSCON_DEVICE_CONFIG_CRUNCH_ENABLE;
509 __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
510 __raw_writel(v, EP93XX_SYSCON_DEVICE_CONFIG);
514 amba_device_register(&uart1_device, &iomem_resource);
515 amba_device_register(&uart2_device, &iomem_resource);
516 amba_device_register(&uart3_device, &iomem_resource);
518 platform_device_register(&ep93xx_rtc_device);
519 platform_device_register(&ep93xx_ohci_device);