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Linux 2.6.25-rc4
[linux-2.6/next.git] / arch / arm / mach-ixp2000 / core.c
blob81cdc826720663722f574605d58cc9b99833cbd5
1 /*
2 * arch/arm/mach-ixp2000/core.c
3 *
4 * Common routines used by all IXP2400/2800 based platforms.
5 *
6 * Author: Deepak Saxena <dsaxena@plexity.net>
7 *
8 * Copyright 2004 (C) MontaVista Software, Inc.
9 *
10 * Based on work Copyright (C) 2002-2003 Intel Corporation
11 *
12 * This file is licensed under the terms of the GNU General Public
13 * License version 2. This program is licensed "as is" without any
14 * warranty of any kind, whether express or implied.
15 */
16
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/irq.h>
23 #include <linux/serial.h>
24 #include <linux/tty.h>
25 #include <linux/bitops.h>
26 #include <linux/serial_8250.h>
27 #include <linux/mm.h>
28
29 #include <asm/types.h>
30 #include <asm/setup.h>
31 #include <asm/memory.h>
32 #include <asm/hardware.h>
33 #include <asm/irq.h>
34 #include <asm/system.h>
35 #include <asm/tlbflush.h>
36 #include <asm/pgtable.h>
37
38 #include <asm/mach/map.h>
39 #include <asm/mach/time.h>
40 #include <asm/mach/irq.h>
41
42 #include <asm/arch/gpio.h>
43
44 static DEFINE_SPINLOCK(ixp2000_slowport_lock);
45 static unsigned long ixp2000_slowport_irq_flags;
46
47 /*************************************************************************
48 * Slowport access routines
49 *************************************************************************/
50 void ixp2000_acquire_slowport(struct slowport_cfg *new_cfg, struct slowport_cfg *old_cfg)
51 {
52 spin_lock_irqsave(&ixp2000_slowport_lock, ixp2000_slowport_irq_flags);
53
54 old_cfg->CCR = *IXP2000_SLOWPORT_CCR;
55 old_cfg->WTC = *IXP2000_SLOWPORT_WTC2;
56 old_cfg->RTC = *IXP2000_SLOWPORT_RTC2;
57 old_cfg->PCR = *IXP2000_SLOWPORT_PCR;
58 old_cfg->ADC = *IXP2000_SLOWPORT_ADC;
59
60 ixp2000_reg_write(IXP2000_SLOWPORT_CCR, new_cfg->CCR);
61 ixp2000_reg_write(IXP2000_SLOWPORT_WTC2, new_cfg->WTC);
62 ixp2000_reg_write(IXP2000_SLOWPORT_RTC2, new_cfg->RTC);
63 ixp2000_reg_write(IXP2000_SLOWPORT_PCR, new_cfg->PCR);
64 ixp2000_reg_wrb(IXP2000_SLOWPORT_ADC, new_cfg->ADC);
65 }
66
67 void ixp2000_release_slowport(struct slowport_cfg *old_cfg)
68 {
69 ixp2000_reg_write(IXP2000_SLOWPORT_CCR, old_cfg->CCR);
70 ixp2000_reg_write(IXP2000_SLOWPORT_WTC2, old_cfg->WTC);
71 ixp2000_reg_write(IXP2000_SLOWPORT_RTC2, old_cfg->RTC);
72 ixp2000_reg_write(IXP2000_SLOWPORT_PCR, old_cfg->PCR);
73 ixp2000_reg_wrb(IXP2000_SLOWPORT_ADC, old_cfg->ADC);
74
75 spin_unlock_irqrestore(&ixp2000_slowport_lock,
76 ixp2000_slowport_irq_flags);
77 }
78
79 /*************************************************************************
80 * Chip specific mappings shared by all IXP2000 systems
81 *************************************************************************/
82 static struct map_desc ixp2000_io_desc[] __initdata = {
83 {
84 .virtual = IXP2000_CAP_VIRT_BASE,
85 .pfn = __phys_to_pfn(IXP2000_CAP_PHYS_BASE),
86 .length = IXP2000_CAP_SIZE,
87 .type = MT_DEVICE_IXP2000,
88 }, {
89 .virtual = IXP2000_INTCTL_VIRT_BASE,
90 .pfn = __phys_to_pfn(IXP2000_INTCTL_PHYS_BASE),
91 .length = IXP2000_INTCTL_SIZE,
92 .type = MT_DEVICE_IXP2000,
93 }, {
94 .virtual = IXP2000_PCI_CREG_VIRT_BASE,
95 .pfn = __phys_to_pfn(IXP2000_PCI_CREG_PHYS_BASE),
96 .length = IXP2000_PCI_CREG_SIZE,
97 .type = MT_DEVICE_IXP2000,
98 }, {
99 .virtual = IXP2000_PCI_CSR_VIRT_BASE,
100 .pfn = __phys_to_pfn(IXP2000_PCI_CSR_PHYS_BASE),
101 .length = IXP2000_PCI_CSR_SIZE,
102 .type = MT_DEVICE_IXP2000,
103 }, {
104 .virtual = IXP2000_MSF_VIRT_BASE,
105 .pfn = __phys_to_pfn(IXP2000_MSF_PHYS_BASE),
106 .length = IXP2000_MSF_SIZE,
107 .type = MT_DEVICE_IXP2000,
108 }, {
109 .virtual = IXP2000_SCRATCH_RING_VIRT_BASE,
110 .pfn = __phys_to_pfn(IXP2000_SCRATCH_RING_PHYS_BASE),
111 .length = IXP2000_SCRATCH_RING_SIZE,
112 .type = MT_DEVICE_IXP2000,
113 }, {
114 .virtual = IXP2000_SRAM0_VIRT_BASE,
115 .pfn = __phys_to_pfn(IXP2000_SRAM0_PHYS_BASE),
116 .length = IXP2000_SRAM0_SIZE,
117 .type = MT_DEVICE_IXP2000,
118 }, {
119 .virtual = IXP2000_PCI_IO_VIRT_BASE,
120 .pfn = __phys_to_pfn(IXP2000_PCI_IO_PHYS_BASE),
121 .length = IXP2000_PCI_IO_SIZE,
122 .type = MT_DEVICE_IXP2000,
123 }, {
124 .virtual = IXP2000_PCI_CFG0_VIRT_BASE,
125 .pfn = __phys_to_pfn(IXP2000_PCI_CFG0_PHYS_BASE),
126 .length = IXP2000_PCI_CFG0_SIZE,
127 .type = MT_DEVICE_IXP2000,
128 }, {
129 .virtual = IXP2000_PCI_CFG1_VIRT_BASE,
130 .pfn = __phys_to_pfn(IXP2000_PCI_CFG1_PHYS_BASE),
131 .length = IXP2000_PCI_CFG1_SIZE,
132 .type = MT_DEVICE_IXP2000,
133 }
134 };
135
136 void __init ixp2000_map_io(void)
137 {
138 /*
139 * On IXP2400 CPUs we need to use MT_DEVICE_IXP2000 so that
140 * XCB=101 (to avoid triggering erratum #66), and given that
141 * this mode speeds up I/O accesses and we have write buffer
142 * flushes in the right places anyway, it doesn't hurt to use
143 * XCB=101 for all IXP2000s.
144 */
145 iotable_init(ixp2000_io_desc, ARRAY_SIZE(ixp2000_io_desc));
146
147 /* Set slowport to 8-bit mode. */
148 ixp2000_reg_wrb(IXP2000_SLOWPORT_FRM, 1);
149 }
150
151
152 /*************************************************************************
153 * Serial port support for IXP2000
154 *************************************************************************/
155 static struct plat_serial8250_port ixp2000_serial_port[] = {
156 {
157 .mapbase = IXP2000_UART_PHYS_BASE,
158 .membase = (char *)(IXP2000_UART_VIRT_BASE + 3),
159 .irq = IRQ_IXP2000_UART,
160 .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
161 .iotype = UPIO_MEM,
162 .regshift = 2,
163 .uartclk = 50000000,
164 },
165 { },
166 };
167
168 static struct resource ixp2000_uart_resource = {
169 .start = IXP2000_UART_PHYS_BASE,
170 .end = IXP2000_UART_PHYS_BASE + 0x1f,
171 .flags = IORESOURCE_MEM,
172 };
173
174 static struct platform_device ixp2000_serial_device = {
175 .name = "serial8250",
176 .id = PLAT8250_DEV_PLATFORM,
177 .dev = {
178 .platform_data = ixp2000_serial_port,
179 },
180 .num_resources = 1,
181 .resource = &ixp2000_uart_resource,
182 };
183
184 void __init ixp2000_uart_init(void)
185 {
186 platform_device_register(&ixp2000_serial_device);
187 }
188
189
190 /*************************************************************************
191 * Timer-tick functions for IXP2000
192 *************************************************************************/
193 static unsigned ticks_per_jiffy;
194 static unsigned ticks_per_usec;
195 static unsigned next_jiffy_time;
196 static volatile unsigned long *missing_jiffy_timer_csr;
197
198 unsigned long ixp2000_gettimeoffset (void)
199 {
200 unsigned long offset;
201
202 offset = next_jiffy_time - *missing_jiffy_timer_csr;
203
204 return offset / ticks_per_usec;
205 }
206
207 static int ixp2000_timer_interrupt(int irq, void *dev_id)
208 {
209 /* clear timer 1 */
210 ixp2000_reg_wrb(IXP2000_T1_CLR, 1);
211
212 while ((signed long)(next_jiffy_time - *missing_jiffy_timer_csr)
213 >= ticks_per_jiffy) {
214 timer_tick();
215 next_jiffy_time -= ticks_per_jiffy;
216 }
217
218 return IRQ_HANDLED;
219 }
220
221 static struct irqaction ixp2000_timer_irq = {
222 .name = "IXP2000 Timer Tick",
223 .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
224 .handler = ixp2000_timer_interrupt,
225 };
226
227 void __init ixp2000_init_time(unsigned long tick_rate)
228 {
229 ticks_per_jiffy = (tick_rate + HZ/2) / HZ;
230 ticks_per_usec = tick_rate / 1000000;
231
232 /*
233 * We use timer 1 as our timer interrupt.
234 */
235 ixp2000_reg_write(IXP2000_T1_CLR, 0);
236 ixp2000_reg_write(IXP2000_T1_CLD, ticks_per_jiffy - 1);
237 ixp2000_reg_write(IXP2000_T1_CTL, (1 << 7));
238
239 /*
240 * We use a second timer as a monotonic counter for tracking
241 * missed jiffies. The IXP2000 has four timers, but if we're
242 * on an A-step IXP2800, timer 2 and 3 don't work, so on those
243 * chips we use timer 4. Timer 4 is the only timer that can
244 * be used for the watchdog, so we use timer 2 if we're on a
245 * non-buggy chip.
246 */
247 if ((*IXP2000_PRODUCT_ID & 0x001ffef0) == 0x00000000) {
248 printk(KERN_INFO "Enabling IXP2800 erratum #25 workaround\n");
249
250 ixp2000_reg_write(IXP2000_T4_CLR, 0);
251 ixp2000_reg_write(IXP2000_T4_CLD, -1);
252 ixp2000_reg_wrb(IXP2000_T4_CTL, (1 << 7));
253 missing_jiffy_timer_csr = IXP2000_T4_CSR;
254 } else {
255 ixp2000_reg_write(IXP2000_T2_CLR, 0);
256 ixp2000_reg_write(IXP2000_T2_CLD, -1);
257 ixp2000_reg_wrb(IXP2000_T2_CTL, (1 << 7));
258 missing_jiffy_timer_csr = IXP2000_T2_CSR;
259 }
260 next_jiffy_time = 0xffffffff;
261
262 /* register for interrupt */
263 setup_irq(IRQ_IXP2000_TIMER1, &ixp2000_timer_irq);
264 }
265
266 /*************************************************************************
267 * GPIO helpers
268 *************************************************************************/
269 static unsigned long GPIO_IRQ_falling_edge;
270 static unsigned long GPIO_IRQ_rising_edge;
271 static unsigned long GPIO_IRQ_level_low;
272 static unsigned long GPIO_IRQ_level_high;
273
274 static void update_gpio_int_csrs(void)
275 {
276 ixp2000_reg_write(IXP2000_GPIO_FEDR, GPIO_IRQ_falling_edge);
277 ixp2000_reg_write(IXP2000_GPIO_REDR, GPIO_IRQ_rising_edge);
278 ixp2000_reg_write(IXP2000_GPIO_LSLR, GPIO_IRQ_level_low);
279 ixp2000_reg_wrb(IXP2000_GPIO_LSHR, GPIO_IRQ_level_high);
280 }
281
282 void gpio_line_config(int line, int direction)
283 {
284 unsigned long flags;
285
286 local_irq_save(flags);
287 if (direction == GPIO_OUT) {
288 /* if it's an output, it ain't an interrupt anymore */
289 GPIO_IRQ_falling_edge &= ~(1 << line);
290 GPIO_IRQ_rising_edge &= ~(1 << line);
291 GPIO_IRQ_level_low &= ~(1 << line);
292 GPIO_IRQ_level_high &= ~(1 << line);
293 update_gpio_int_csrs();
294
295 ixp2000_reg_wrb(IXP2000_GPIO_PDSR, 1 << line);
296 } else if (direction == GPIO_IN) {
297 ixp2000_reg_wrb(IXP2000_GPIO_PDCR, 1 << line);
298 }
299 local_irq_restore(flags);
300 }
301 EXPORT_SYMBOL(gpio_line_config);
302
303
304 /*************************************************************************
305 * IRQ handling IXP2000
306 *************************************************************************/
307 static void ixp2000_GPIO_irq_handler(unsigned int irq, struct irq_desc *desc)
308 {
309 int i;
310 unsigned long status = *IXP2000_GPIO_INST;
311
312 for (i = 0; i <= 7; i++) {
313 if (status & (1<<i)) {
314 desc = irq_desc + i + IRQ_IXP2000_GPIO0;
315 desc_handle_irq(i + IRQ_IXP2000_GPIO0, desc);
316 }
317 }
318 }
319
320 static int ixp2000_GPIO_irq_type(unsigned int irq, unsigned int type)
321 {
322 int line = irq - IRQ_IXP2000_GPIO0;
323
324 /*
325 * First, configure this GPIO line as an input.
326 */
327 ixp2000_reg_write(IXP2000_GPIO_PDCR, 1 << line);
328
329 /*
330 * Then, set the proper trigger type.
331 */
332 if (type & IRQT_FALLING)
333 GPIO_IRQ_falling_edge |= 1 << line;
334 else
335 GPIO_IRQ_falling_edge &= ~(1 << line);
336 if (type & IRQT_RISING)
337 GPIO_IRQ_rising_edge |= 1 << line;
338 else
339 GPIO_IRQ_rising_edge &= ~(1 << line);
340 if (type & IRQT_LOW)
341 GPIO_IRQ_level_low |= 1 << line;
342 else
343 GPIO_IRQ_level_low &= ~(1 << line);
344 if (type & IRQT_HIGH)
345 GPIO_IRQ_level_high |= 1 << line;
346 else
347 GPIO_IRQ_level_high &= ~(1 << line);
348 update_gpio_int_csrs();
349
350 return 0;
351 }
352
353 static void ixp2000_GPIO_irq_mask_ack(unsigned int irq)
354 {
355 ixp2000_reg_write(IXP2000_GPIO_INCR, (1 << (irq - IRQ_IXP2000_GPIO0)));
356
357 ixp2000_reg_write(IXP2000_GPIO_EDSR, (1 << (irq - IRQ_IXP2000_GPIO0)));
358 ixp2000_reg_write(IXP2000_GPIO_LDSR, (1 << (irq - IRQ_IXP2000_GPIO0)));
359 ixp2000_reg_wrb(IXP2000_GPIO_INST, (1 << (irq - IRQ_IXP2000_GPIO0)));
360 }
361
362 static void ixp2000_GPIO_irq_mask(unsigned int irq)
363 {
364 ixp2000_reg_wrb(IXP2000_GPIO_INCR, (1 << (irq - IRQ_IXP2000_GPIO0)));
365 }
366
367 static void ixp2000_GPIO_irq_unmask(unsigned int irq)
368 {
369 ixp2000_reg_write(IXP2000_GPIO_INSR, (1 << (irq - IRQ_IXP2000_GPIO0)));
370 }
371
372 static struct irq_chip ixp2000_GPIO_irq_chip = {
373 .ack = ixp2000_GPIO_irq_mask_ack,
374 .mask = ixp2000_GPIO_irq_mask,
375 .unmask = ixp2000_GPIO_irq_unmask,
376 .set_type = ixp2000_GPIO_irq_type,
377 };
378
379 static void ixp2000_pci_irq_mask(unsigned int irq)
380 {
381 unsigned long temp = *IXP2000_PCI_XSCALE_INT_ENABLE;
382 if (irq == IRQ_IXP2000_PCIA)
383 ixp2000_reg_wrb(IXP2000_PCI_XSCALE_INT_ENABLE, (temp & ~(1 << 26)));
384 else if (irq == IRQ_IXP2000_PCIB)
385 ixp2000_reg_wrb(IXP2000_PCI_XSCALE_INT_ENABLE, (temp & ~(1 << 27)));
386 }
387
388 static void ixp2000_pci_irq_unmask(unsigned int irq)
389 {
390 unsigned long temp = *IXP2000_PCI_XSCALE_INT_ENABLE;
391 if (irq == IRQ_IXP2000_PCIA)
392 ixp2000_reg_write(IXP2000_PCI_XSCALE_INT_ENABLE, (temp | (1 << 26)));
393 else if (irq == IRQ_IXP2000_PCIB)
394 ixp2000_reg_write(IXP2000_PCI_XSCALE_INT_ENABLE, (temp | (1 << 27)));
395 }
396
397 /*
398 * Error interrupts. These are used extensively by the microengine drivers
399 */
400 static void ixp2000_err_irq_handler(unsigned int irq, struct irq_desc *desc)
401 {
402 int i;
403 unsigned long status = *IXP2000_IRQ_ERR_STATUS;
404
405 for(i = 31; i >= 0; i--) {
406 if(status & (1 << i)) {
407 desc = irq_desc + IRQ_IXP2000_DRAM0_MIN_ERR + i;
408 desc_handle_irq(IRQ_IXP2000_DRAM0_MIN_ERR + i, desc);
409 }
410 }
411 }
412
413 static void ixp2000_err_irq_mask(unsigned int irq)
414 {
415 ixp2000_reg_write(IXP2000_IRQ_ERR_ENABLE_CLR,
416 (1 << (irq - IRQ_IXP2000_DRAM0_MIN_ERR)));
417 }
418
419 static void ixp2000_err_irq_unmask(unsigned int irq)
420 {
421 ixp2000_reg_write(IXP2000_IRQ_ERR_ENABLE_SET,
422 (1 << (irq - IRQ_IXP2000_DRAM0_MIN_ERR)));
423 }
424
425 static struct irq_chip ixp2000_err_irq_chip = {
426 .ack = ixp2000_err_irq_mask,
427 .mask = ixp2000_err_irq_mask,
428 .unmask = ixp2000_err_irq_unmask
429 };
430
431 static struct irq_chip ixp2000_pci_irq_chip = {
432 .ack = ixp2000_pci_irq_mask,
433 .mask = ixp2000_pci_irq_mask,
434 .unmask = ixp2000_pci_irq_unmask
435 };
436
437 static void ixp2000_irq_mask(unsigned int irq)
438 {
439 ixp2000_reg_wrb(IXP2000_IRQ_ENABLE_CLR, (1 << irq));
440 }
441
442 static void ixp2000_irq_unmask(unsigned int irq)
443 {
444 ixp2000_reg_write(IXP2000_IRQ_ENABLE_SET, (1 << irq));
445 }
446
447 static struct irq_chip ixp2000_irq_chip = {
448 .ack = ixp2000_irq_mask,
449 .mask = ixp2000_irq_mask,
450 .unmask = ixp2000_irq_unmask
451 };
452
453 void __init ixp2000_init_irq(void)
454 {
455 int irq;
456
457 /*
458 * Mask all sources
459 */
460 ixp2000_reg_write(IXP2000_IRQ_ENABLE_CLR, 0xffffffff);
461 ixp2000_reg_write(IXP2000_FIQ_ENABLE_CLR, 0xffffffff);
462
463 /* clear all GPIO edge/level detects */
464 ixp2000_reg_write(IXP2000_GPIO_REDR, 0);
465 ixp2000_reg_write(IXP2000_GPIO_FEDR, 0);
466 ixp2000_reg_write(IXP2000_GPIO_LSHR, 0);
467 ixp2000_reg_write(IXP2000_GPIO_LSLR, 0);
468 ixp2000_reg_write(IXP2000_GPIO_INCR, -1);
469
470 /* clear PCI interrupt sources */
471 ixp2000_reg_wrb(IXP2000_PCI_XSCALE_INT_ENABLE, 0);
472
473 /*
474 * Certain bits in the IRQ status register of the
475 * IXP2000 are reserved. Instead of trying to map
476 * things non 1:1 from bit position to IRQ number,
477 * we mark the reserved IRQs as invalid. This makes
478 * our mask/unmask code much simpler.
479 */
480 for (irq = IRQ_IXP2000_SOFT_INT; irq <= IRQ_IXP2000_THDB3; irq++) {
481 if ((1 << irq) & IXP2000_VALID_IRQ_MASK) {
482 set_irq_chip(irq, &ixp2000_irq_chip);
483 set_irq_handler(irq, handle_level_irq);
484 set_irq_flags(irq, IRQF_VALID);
485 } else set_irq_flags(irq, 0);
486 }
487
488 for (irq = IRQ_IXP2000_DRAM0_MIN_ERR; irq <= IRQ_IXP2000_SP_INT; irq++) {
489 if((1 << (irq - IRQ_IXP2000_DRAM0_MIN_ERR)) &
490 IXP2000_VALID_ERR_IRQ_MASK) {
491 set_irq_chip(irq, &ixp2000_err_irq_chip);
492 set_irq_handler(irq, handle_level_irq);
493 set_irq_flags(irq, IRQF_VALID);
494 }
495 else
496 set_irq_flags(irq, 0);
497 }
498 set_irq_chained_handler(IRQ_IXP2000_ERRSUM, ixp2000_err_irq_handler);
499
500 for (irq = IRQ_IXP2000_GPIO0; irq <= IRQ_IXP2000_GPIO7; irq++) {
501 set_irq_chip(irq, &ixp2000_GPIO_irq_chip);
502 set_irq_handler(irq, handle_level_irq);
503 set_irq_flags(irq, IRQF_VALID);
504 }
505 set_irq_chained_handler(IRQ_IXP2000_GPIO, ixp2000_GPIO_irq_handler);
506
507 /*
508 * Enable PCI irqs. The actual PCI[AB] decoding is done in
509 * entry-macro.S, so we don't need a chained handler for the
510 * PCI interrupt source.
511 */
512 ixp2000_reg_write(IXP2000_IRQ_ENABLE_SET, (1 << IRQ_IXP2000_PCI));
513 for (irq = IRQ_IXP2000_PCIA; irq <= IRQ_IXP2000_PCIB; irq++) {
514 set_irq_chip(irq, &ixp2000_pci_irq_chip);
515 set_irq_handler(irq, handle_level_irq);
516 set_irq_flags(irq, IRQF_VALID);
517 }
518 }
519
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