2 * arch/arm/mach-ixp4xx/common.c
4 * Generic code shared across all IXP4XX platforms
6 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
8 * Copyright 2002 (c) Intel Corporation
9 * Copyright 2003-2004 (c) MontaVista, Software, Inc.
11 * This file is licensed under the terms of the GNU General Public
12 * License version 2. This program is licensed "as is" without any
13 * warranty of any kind, whether express or implied.
16 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/serial.h>
20 #include <linux/sched.h>
21 #include <linux/tty.h>
22 #include <linux/platform_device.h>
23 #include <linux/serial_core.h>
24 #include <linux/bootmem.h>
25 #include <linux/interrupt.h>
26 #include <linux/bitops.h>
27 #include <linux/time.h>
28 #include <linux/timex.h>
29 #include <linux/clocksource.h>
30 #include <linux/clockchips.h>
32 #include <asm/arch/udc.h>
33 #include <asm/hardware.h>
34 #include <asm/uaccess.h>
36 #include <asm/pgtable.h>
40 #include <asm/mach/map.h>
41 #include <asm/mach/irq.h>
42 #include <asm/mach/time.h>
44 static int __init ixp4xx_clocksource_init(void);
45 static int __init ixp4xx_clockevent_init(void);
46 static struct clock_event_device clockevent_ixp4xx;
48 /*************************************************************************
49 * IXP4xx chipset I/O mapping
50 *************************************************************************/
51 static struct map_desc ixp4xx_io_desc[] __initdata = {
52 { /* UART, Interrupt ctrl, GPIO, timers, NPEs, MACs, USB .... */
53 .virtual = IXP4XX_PERIPHERAL_BASE_VIRT,
54 .pfn = __phys_to_pfn(IXP4XX_PERIPHERAL_BASE_PHYS),
55 .length = IXP4XX_PERIPHERAL_REGION_SIZE,
57 }, { /* Expansion Bus Config Registers */
58 .virtual = IXP4XX_EXP_CFG_BASE_VIRT,
59 .pfn = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS),
60 .length = IXP4XX_EXP_CFG_REGION_SIZE,
62 }, { /* PCI Registers */
63 .virtual = IXP4XX_PCI_CFG_BASE_VIRT,
64 .pfn = __phys_to_pfn(IXP4XX_PCI_CFG_BASE_PHYS),
65 .length = IXP4XX_PCI_CFG_REGION_SIZE,
68 #ifdef CONFIG_DEBUG_LL
69 { /* Debug UART mapping */
70 .virtual = IXP4XX_DEBUG_UART_BASE_VIRT,
71 .pfn = __phys_to_pfn(IXP4XX_DEBUG_UART_BASE_PHYS),
72 .length = IXP4XX_DEBUG_UART_REGION_SIZE,
78 void __init ixp4xx_map_io(void)
80 iotable_init(ixp4xx_io_desc, ARRAY_SIZE(ixp4xx_io_desc));
84 /*************************************************************************
85 * IXP4xx chipset IRQ handling
87 * TODO: GPIO IRQs should be marked invalid until the user of the IRQ
88 * (be it PCI or something else) configures that GPIO line
90 **************************************************************************/
91 enum ixp4xx_irq_type {
92 IXP4XX_IRQ_LEVEL, IXP4XX_IRQ_EDGE
95 /* Each bit represents an IRQ: 1: edge-triggered, 0: level triggered */
96 static unsigned long long ixp4xx_irq_edge = 0;
99 * IRQ -> GPIO mapping table
101 static signed char irq2gpio[32] = {
102 -1, -1, -1, -1, -1, -1, 0, 1,
103 -1, -1, -1, -1, -1, -1, -1, -1,
104 -1, -1, -1, 2, 3, 4, 5, 6,
105 7, 8, 9, 10, 11, 12, -1, -1,
108 static int ixp4xx_set_irq_type(unsigned int irq, unsigned int type)
110 int line = irq2gpio[irq];
112 enum ixp4xx_irq_type irq_type;
113 volatile u32 *int_reg;
123 int_style = IXP4XX_GPIO_STYLE_TRANSITIONAL;
124 irq_type = IXP4XX_IRQ_EDGE;
127 int_style = IXP4XX_GPIO_STYLE_RISING_EDGE;
128 irq_type = IXP4XX_IRQ_EDGE;
131 int_style = IXP4XX_GPIO_STYLE_FALLING_EDGE;
132 irq_type = IXP4XX_IRQ_EDGE;
135 int_style = IXP4XX_GPIO_STYLE_ACTIVE_HIGH;
136 irq_type = IXP4XX_IRQ_LEVEL;
139 int_style = IXP4XX_GPIO_STYLE_ACTIVE_LOW;
140 irq_type = IXP4XX_IRQ_LEVEL;
146 if (irq_type == IXP4XX_IRQ_EDGE)
147 ixp4xx_irq_edge |= (1 << irq);
149 ixp4xx_irq_edge &= ~(1 << irq);
151 if (line >= 8) { /* pins 8-15 */
153 int_reg = IXP4XX_GPIO_GPIT2R;
154 } else { /* pins 0-7 */
155 int_reg = IXP4XX_GPIO_GPIT1R;
158 /* Clear the style for the appropriate pin */
159 *int_reg &= ~(IXP4XX_GPIO_STYLE_CLEAR <<
160 (line * IXP4XX_GPIO_STYLE_SIZE));
162 *IXP4XX_GPIO_GPISR = (1 << line);
164 /* Set the new style */
165 *int_reg |= (int_style << (line * IXP4XX_GPIO_STYLE_SIZE));
167 /* Configure the line as an input */
168 gpio_line_config(line, IXP4XX_GPIO_IN);
173 static void ixp4xx_irq_mask(unsigned int irq)
175 if (cpu_is_ixp46x() && irq >= 32)
176 *IXP4XX_ICMR2 &= ~(1 << (irq - 32));
178 *IXP4XX_ICMR &= ~(1 << irq);
181 static void ixp4xx_irq_ack(unsigned int irq)
183 int line = (irq < 32) ? irq2gpio[irq] : -1;
186 *IXP4XX_GPIO_GPISR = (1 << line);
190 * Level triggered interrupts on GPIO lines can only be cleared when the
191 * interrupt condition disappears.
193 static void ixp4xx_irq_unmask(unsigned int irq)
195 if (!(ixp4xx_irq_edge & (1 << irq)))
198 if (cpu_is_ixp46x() && irq >= 32)
199 *IXP4XX_ICMR2 |= (1 << (irq - 32));
201 *IXP4XX_ICMR |= (1 << irq);
204 static struct irq_chip ixp4xx_irq_chip = {
206 .ack = ixp4xx_irq_ack,
207 .mask = ixp4xx_irq_mask,
208 .unmask = ixp4xx_irq_unmask,
209 .set_type = ixp4xx_set_irq_type,
212 void __init ixp4xx_init_irq(void)
216 /* Route all sources to IRQ instead of FIQ */
219 /* Disable all interrupt */
222 if (cpu_is_ixp46x()) {
223 /* Route upper 32 sources to IRQ instead of FIQ */
224 *IXP4XX_ICLR2 = 0x00;
226 /* Disable upper 32 interrupts */
227 *IXP4XX_ICMR2 = 0x00;
230 /* Default to all level triggered */
231 for(i = 0; i < NR_IRQS; i++) {
232 set_irq_chip(i, &ixp4xx_irq_chip);
233 set_irq_handler(i, handle_level_irq);
234 set_irq_flags(i, IRQF_VALID);
239 /*************************************************************************
241 * We use OS timer1 on the CPU for the timer tick and the timestamp
242 * counter as a source of real clock ticks to account for missed jiffies.
243 *************************************************************************/
245 static irqreturn_t ixp4xx_timer_interrupt(int irq, void *dev_id)
247 struct clock_event_device *evt = &clockevent_ixp4xx;
249 /* Clear Pending Interrupt by writing '1' to it */
250 *IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND;
252 evt->event_handler(evt);
257 static struct irqaction ixp4xx_timer_irq = {
259 .flags = IRQF_DISABLED | IRQF_TIMER,
260 .handler = ixp4xx_timer_interrupt,
263 static void __init ixp4xx_timer_init(void)
265 /* Reset/disable counter */
268 /* Clear Pending Interrupt by writing '1' to it */
269 *IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND;
271 /* Reset time-stamp counter */
274 /* Connect the interrupt handler and enable the interrupt */
275 setup_irq(IRQ_IXP4XX_TIMER1, &ixp4xx_timer_irq);
277 ixp4xx_clocksource_init();
278 ixp4xx_clockevent_init();
281 struct sys_timer ixp4xx_timer = {
282 .init = ixp4xx_timer_init,
285 static struct pxa2xx_udc_mach_info ixp4xx_udc_info;
287 void __init ixp4xx_set_udc_info(struct pxa2xx_udc_mach_info *info)
289 memcpy(&ixp4xx_udc_info, info, sizeof *info);
292 static struct resource ixp4xx_udc_resources[] = {
296 .flags = IORESOURCE_MEM,
299 .start = IRQ_IXP4XX_USB,
300 .end = IRQ_IXP4XX_USB,
301 .flags = IORESOURCE_IRQ,
306 * USB device controller. The IXP4xx uses the same controller as PXA2XX,
307 * so we just use the same device.
309 static struct platform_device ixp4xx_udc_device = {
310 .name = "pxa2xx-udc",
313 .resource = ixp4xx_udc_resources,
315 .platform_data = &ixp4xx_udc_info,
319 static struct platform_device *ixp4xx_devices[] __initdata = {
323 static struct resource ixp46x_i2c_resources[] = {
327 .flags = IORESOURCE_MEM,
330 .start = IRQ_IXP4XX_I2C,
331 .end = IRQ_IXP4XX_I2C,
332 .flags = IORESOURCE_IRQ
337 * I2C controller. The IXP46x uses the same block as the IOP3xx, so
338 * we just use the same device name.
340 static struct platform_device ixp46x_i2c_controller = {
341 .name = "IOP3xx-I2C",
344 .resource = ixp46x_i2c_resources
347 static struct platform_device *ixp46x_devices[] __initdata = {
348 &ixp46x_i2c_controller
351 unsigned long ixp4xx_exp_bus_size;
352 EXPORT_SYMBOL(ixp4xx_exp_bus_size);
354 void __init ixp4xx_sys_init(void)
356 ixp4xx_exp_bus_size = SZ_16M;
358 platform_add_devices(ixp4xx_devices, ARRAY_SIZE(ixp4xx_devices));
360 if (cpu_is_ixp46x()) {
363 platform_add_devices(ixp46x_devices,
364 ARRAY_SIZE(ixp46x_devices));
366 for (region = 0; region < 7; region++) {
367 if((*(IXP4XX_EXP_REG(0x4 * region)) & 0x200)) {
368 ixp4xx_exp_bus_size = SZ_32M;
374 printk("IXP4xx: Using %luMiB expansion bus window size\n",
375 ixp4xx_exp_bus_size >> 20);
381 cycle_t ixp4xx_get_cycles(void)
386 static struct clocksource clocksource_ixp4xx = {
389 .read = ixp4xx_get_cycles,
390 .mask = CLOCKSOURCE_MASK(32),
392 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
395 unsigned long ixp4xx_timer_freq = FREQ;
396 static int __init ixp4xx_clocksource_init(void)
398 clocksource_ixp4xx.mult =
399 clocksource_hz2mult(ixp4xx_timer_freq,
400 clocksource_ixp4xx.shift);
401 clocksource_register(&clocksource_ixp4xx);
409 static int ixp4xx_set_next_event(unsigned long evt,
410 struct clock_event_device *unused)
412 unsigned long opts = *IXP4XX_OSRT1 & IXP4XX_OST_RELOAD_MASK;
414 *IXP4XX_OSRT1 = (evt & ~IXP4XX_OST_RELOAD_MASK) | opts;
419 static void ixp4xx_set_mode(enum clock_event_mode mode,
420 struct clock_event_device *evt)
422 unsigned long opts, osrt = *IXP4XX_OSRT1 & ~IXP4XX_OST_RELOAD_MASK;
425 case CLOCK_EVT_MODE_PERIODIC:
426 osrt = LATCH & ~IXP4XX_OST_RELOAD_MASK;
427 opts = IXP4XX_OST_ENABLE;
429 case CLOCK_EVT_MODE_ONESHOT:
430 /* period set by 'set next_event' */
432 opts = IXP4XX_OST_ENABLE | IXP4XX_OST_ONE_SHOT;
434 case CLOCK_EVT_MODE_SHUTDOWN:
435 case CLOCK_EVT_MODE_UNUSED:
441 *IXP4XX_OSRT1 = osrt | opts;
444 static struct clock_event_device clockevent_ixp4xx = {
445 .name = "ixp4xx timer1",
446 .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
449 .set_mode = ixp4xx_set_mode,
450 .set_next_event = ixp4xx_set_next_event,
453 static int __init ixp4xx_clockevent_init(void)
455 clockevent_ixp4xx.mult = div_sc(FREQ, NSEC_PER_SEC,
456 clockevent_ixp4xx.shift);
457 clockevent_ixp4xx.max_delta_ns =
458 clockevent_delta2ns(0xfffffffe, &clockevent_ixp4xx);
459 clockevent_ixp4xx.min_delta_ns =
460 clockevent_delta2ns(0xf, &clockevent_ixp4xx);
461 clockevent_ixp4xx.cpumask = cpumask_of_cpu(0);
463 clockevents_register_device(&clockevent_ixp4xx);