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 <mach/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 <mach/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 *************************************************************************/
ixp2000_acquire_slowport(struct slowport_cfg * new_cfg,struct slowport_cfg * old_cfg)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
ixp2000_release_slowport(struct slowport_cfg * old_cfg)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,
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,
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,
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,
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,
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,
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,
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,
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,
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,
133 }
134 };
135
ixp2000_map_io(void)136 void __init ixp2000_map_io(void)
137 {
138 iotable_init(ixp2000_io_desc, ARRAY_SIZE(ixp2000_io_desc));
139
140 /* Set slowport to 8-bit mode. */
141 ixp2000_reg_wrb(IXP2000_SLOWPORT_FRM, 1);
142 }
143
144
145 /*************************************************************************
146 * Serial port support for IXP2000
147 *************************************************************************/
148 static struct plat_serial8250_port ixp2000_serial_port[] = {
149 {
150 .mapbase = IXP2000_UART_PHYS_BASE,
151 .membase = (char *)(IXP2000_UART_VIRT_BASE + 3),
152 .irq = IRQ_IXP2000_UART,
153 .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
154 .iotype = UPIO_MEM,
155 .regshift = 2,
156 .uartclk = 50000000,
157 },
158 { },
159 };
160
161 static struct resource ixp2000_uart_resource = {
162 .start = IXP2000_UART_PHYS_BASE,
163 .end = IXP2000_UART_PHYS_BASE + 0x1f,
164 .flags = IORESOURCE_MEM,
165 };
166
167 static struct platform_device ixp2000_serial_device = {
168 .name = "serial8250",
169 .id = PLAT8250_DEV_PLATFORM,
170 .dev = {
171 .platform_data = ixp2000_serial_port,
172 },
173 .num_resources = 1,
174 .resource = &ixp2000_uart_resource,
175 };
176
ixp2000_uart_init(void)177 void __init ixp2000_uart_init(void)
178 {
179 platform_device_register(&ixp2000_serial_device);
180 }
181
182
183 /*************************************************************************
184 * Timer-tick functions for IXP2000
185 *************************************************************************/
186 static unsigned ticks_per_jiffy;
187 static unsigned ticks_per_usec;
188 static unsigned next_jiffy_time;
189 static volatile unsigned long *missing_jiffy_timer_csr;
190
ixp2000_gettimeoffset(void)191 unsigned long ixp2000_gettimeoffset (void)
192 {
193 unsigned long offset;
194
195 offset = next_jiffy_time - *missing_jiffy_timer_csr;
196
197 return offset / ticks_per_usec;
198 }
199
ixp2000_timer_interrupt(int irq,void * dev_id)200 static int ixp2000_timer_interrupt(int irq, void *dev_id)
201 {
202 /* clear timer 1 */
203 ixp2000_reg_wrb(IXP2000_T1_CLR, 1);
204
205 while ((signed long)(next_jiffy_time - *missing_jiffy_timer_csr)
206 >= ticks_per_jiffy) {
207 timer_tick();
208 next_jiffy_time -= ticks_per_jiffy;
209 }
210
211 return IRQ_HANDLED;
212 }
213
214 static struct irqaction ixp2000_timer_irq = {
215 .name = "IXP2000 Timer Tick",
216 .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
217 .handler = ixp2000_timer_interrupt,
218 };
219
ixp2000_init_time(unsigned long tick_rate)220 void __init ixp2000_init_time(unsigned long tick_rate)
221 {
222 ticks_per_jiffy = (tick_rate + HZ/2) / HZ;
223 ticks_per_usec = tick_rate / 1000000;
224
225 /*
226 * We use timer 1 as our timer interrupt.
227 */
228 ixp2000_reg_write(IXP2000_T1_CLR, 0);
229 ixp2000_reg_write(IXP2000_T1_CLD, ticks_per_jiffy - 1);
230 ixp2000_reg_write(IXP2000_T1_CTL, (1 << 7));
231
232 /*
233 * We use a second timer as a monotonic counter for tracking
234 * missed jiffies. The IXP2000 has four timers, but if we're
235 * on an A-step IXP2800, timer 2 and 3 don't work, so on those
236 * chips we use timer 4. Timer 4 is the only timer that can
237 * be used for the watchdog, so we use timer 2 if we're on a
238 * non-buggy chip.
239 */
240 if ((*IXP2000_PRODUCT_ID & 0x001ffef0) == 0x00000000) {
241 printk(KERN_INFO "Enabling IXP2800 erratum #25 workaround\n");
242
243 ixp2000_reg_write(IXP2000_T4_CLR, 0);
244 ixp2000_reg_write(IXP2000_T4_CLD, -1);
245 ixp2000_reg_wrb(IXP2000_T4_CTL, (1 << 7));
246 missing_jiffy_timer_csr = IXP2000_T4_CSR;
247 } else {
248 ixp2000_reg_write(IXP2000_T2_CLR, 0);
249 ixp2000_reg_write(IXP2000_T2_CLD, -1);
250 ixp2000_reg_wrb(IXP2000_T2_CTL, (1 << 7));
251 missing_jiffy_timer_csr = IXP2000_T2_CSR;
252 }
253 next_jiffy_time = 0xffffffff;
254
255 /* register for interrupt */
256 setup_irq(IRQ_IXP2000_TIMER1, &ixp2000_timer_irq);
257 }
258
259 /*************************************************************************
260 * GPIO helpers
261 *************************************************************************/
262 static unsigned long GPIO_IRQ_falling_edge;
263 static unsigned long GPIO_IRQ_rising_edge;
264 static unsigned long GPIO_IRQ_level_low;
265 static unsigned long GPIO_IRQ_level_high;
266
update_gpio_int_csrs(void)267 static void update_gpio_int_csrs(void)
268 {
269 ixp2000_reg_write(IXP2000_GPIO_FEDR, GPIO_IRQ_falling_edge);
270 ixp2000_reg_write(IXP2000_GPIO_REDR, GPIO_IRQ_rising_edge);
271 ixp2000_reg_write(IXP2000_GPIO_LSLR, GPIO_IRQ_level_low);
272 ixp2000_reg_wrb(IXP2000_GPIO_LSHR, GPIO_IRQ_level_high);
273 }
274
gpio_line_config(int line,int direction)275 void gpio_line_config(int line, int direction)
276 {
277 unsigned long flags;
278
279 local_irq_save(flags);
280 if (direction == GPIO_OUT) {
281 /* if it's an output, it ain't an interrupt anymore */
282 GPIO_IRQ_falling_edge &= ~(1 << line);
283 GPIO_IRQ_rising_edge &= ~(1 << line);
284 GPIO_IRQ_level_low &= ~(1 << line);
285 GPIO_IRQ_level_high &= ~(1 << line);
286 update_gpio_int_csrs();
287
288 ixp2000_reg_wrb(IXP2000_GPIO_PDSR, 1 << line);
289 } else if (direction == GPIO_IN) {
290 ixp2000_reg_wrb(IXP2000_GPIO_PDCR, 1 << line);
291 }
292 local_irq_restore(flags);
293 }
294 EXPORT_SYMBOL(gpio_line_config);
295
296
297 /*************************************************************************
298 * IRQ handling IXP2000
299 *************************************************************************/
ixp2000_GPIO_irq_handler(unsigned int irq,struct irq_desc * desc)300 static void ixp2000_GPIO_irq_handler(unsigned int irq, struct irq_desc *desc)
301 {
302 int i;
303 unsigned long status = *IXP2000_GPIO_INST;
304
305 for (i = 0; i <= 7; i++) {
306 if (status & (1<<i)) {
307 generic_handle_irq(i + IRQ_IXP2000_GPIO0);
308 }
309 }
310 }
311
ixp2000_GPIO_irq_type(unsigned int irq,unsigned int type)312 static int ixp2000_GPIO_irq_type(unsigned int irq, unsigned int type)
313 {
314 int line = irq - IRQ_IXP2000_GPIO0;
315
316 /*
317 * First, configure this GPIO line as an input.
318 */
319 ixp2000_reg_write(IXP2000_GPIO_PDCR, 1 << line);
320
321 /*
322 * Then, set the proper trigger type.
323 */
324 if (type & IRQ_TYPE_EDGE_FALLING)
325 GPIO_IRQ_falling_edge |= 1 << line;
326 else
327 GPIO_IRQ_falling_edge &= ~(1 << line);
328 if (type & IRQ_TYPE_EDGE_RISING)
329 GPIO_IRQ_rising_edge |= 1 << line;
330 else
331 GPIO_IRQ_rising_edge &= ~(1 << line);
332 if (type & IRQ_TYPE_LEVEL_LOW)
333 GPIO_IRQ_level_low |= 1 << line;
334 else
335 GPIO_IRQ_level_low &= ~(1 << line);
336 if (type & IRQ_TYPE_LEVEL_HIGH)
337 GPIO_IRQ_level_high |= 1 << line;
338 else
339 GPIO_IRQ_level_high &= ~(1 << line);
340 update_gpio_int_csrs();
341
342 return 0;
343 }
344
ixp2000_GPIO_irq_mask_ack(unsigned int irq)345 static void ixp2000_GPIO_irq_mask_ack(unsigned int irq)
346 {
347 ixp2000_reg_write(IXP2000_GPIO_INCR, (1 << (irq - IRQ_IXP2000_GPIO0)));
348
349 ixp2000_reg_write(IXP2000_GPIO_EDSR, (1 << (irq - IRQ_IXP2000_GPIO0)));
350 ixp2000_reg_write(IXP2000_GPIO_LDSR, (1 << (irq - IRQ_IXP2000_GPIO0)));
351 ixp2000_reg_wrb(IXP2000_GPIO_INST, (1 << (irq - IRQ_IXP2000_GPIO0)));
352 }
353
ixp2000_GPIO_irq_mask(unsigned int irq)354 static void ixp2000_GPIO_irq_mask(unsigned int irq)
355 {
356 ixp2000_reg_wrb(IXP2000_GPIO_INCR, (1 << (irq - IRQ_IXP2000_GPIO0)));
357 }
358
ixp2000_GPIO_irq_unmask(unsigned int irq)359 static void ixp2000_GPIO_irq_unmask(unsigned int irq)
360 {
361 ixp2000_reg_write(IXP2000_GPIO_INSR, (1 << (irq - IRQ_IXP2000_GPIO0)));
362 }
363
364 static struct irq_chip ixp2000_GPIO_irq_chip = {
365 .ack = ixp2000_GPIO_irq_mask_ack,
366 .mask = ixp2000_GPIO_irq_mask,
367 .unmask = ixp2000_GPIO_irq_unmask,
368 .set_type = ixp2000_GPIO_irq_type,
369 };
370
ixp2000_pci_irq_mask(unsigned int irq)371 static void ixp2000_pci_irq_mask(unsigned int irq)
372 {
373 unsigned long temp = *IXP2000_PCI_XSCALE_INT_ENABLE;
374 if (irq == IRQ_IXP2000_PCIA)
375 ixp2000_reg_wrb(IXP2000_PCI_XSCALE_INT_ENABLE, (temp & ~(1 << 26)));
376 else if (irq == IRQ_IXP2000_PCIB)
377 ixp2000_reg_wrb(IXP2000_PCI_XSCALE_INT_ENABLE, (temp & ~(1 << 27)));
378 }
379
ixp2000_pci_irq_unmask(unsigned int irq)380 static void ixp2000_pci_irq_unmask(unsigned int irq)
381 {
382 unsigned long temp = *IXP2000_PCI_XSCALE_INT_ENABLE;
383 if (irq == IRQ_IXP2000_PCIA)
384 ixp2000_reg_write(IXP2000_PCI_XSCALE_INT_ENABLE, (temp | (1 << 26)));
385 else if (irq == IRQ_IXP2000_PCIB)
386 ixp2000_reg_write(IXP2000_PCI_XSCALE_INT_ENABLE, (temp | (1 << 27)));
387 }
388
389 /*
390 * Error interrupts. These are used extensively by the microengine drivers
391 */
ixp2000_err_irq_handler(unsigned int irq,struct irq_desc * desc)392 static void ixp2000_err_irq_handler(unsigned int irq, struct irq_desc *desc)
393 {
394 int i;
395 unsigned long status = *IXP2000_IRQ_ERR_STATUS;
396
397 for(i = 31; i >= 0; i--) {
398 if(status & (1 << i)) {
399 generic_handle_irq(IRQ_IXP2000_DRAM0_MIN_ERR + i);
400 }
401 }
402 }
403
ixp2000_err_irq_mask(unsigned int irq)404 static void ixp2000_err_irq_mask(unsigned int irq)
405 {
406 ixp2000_reg_write(IXP2000_IRQ_ERR_ENABLE_CLR,
407 (1 << (irq - IRQ_IXP2000_DRAM0_MIN_ERR)));
408 }
409
ixp2000_err_irq_unmask(unsigned int irq)410 static void ixp2000_err_irq_unmask(unsigned int irq)
411 {
412 ixp2000_reg_write(IXP2000_IRQ_ERR_ENABLE_SET,
413 (1 << (irq - IRQ_IXP2000_DRAM0_MIN_ERR)));
414 }
415
416 static struct irq_chip ixp2000_err_irq_chip = {
417 .ack = ixp2000_err_irq_mask,
418 .mask = ixp2000_err_irq_mask,
419 .unmask = ixp2000_err_irq_unmask
420 };
421
422 static struct irq_chip ixp2000_pci_irq_chip = {
423 .ack = ixp2000_pci_irq_mask,
424 .mask = ixp2000_pci_irq_mask,
425 .unmask = ixp2000_pci_irq_unmask
426 };
427
ixp2000_irq_mask(unsigned int irq)428 static void ixp2000_irq_mask(unsigned int irq)
429 {
430 ixp2000_reg_wrb(IXP2000_IRQ_ENABLE_CLR, (1 << irq));
431 }
432
ixp2000_irq_unmask(unsigned int irq)433 static void ixp2000_irq_unmask(unsigned int irq)
434 {
435 ixp2000_reg_write(IXP2000_IRQ_ENABLE_SET, (1 << irq));
436 }
437
438 static struct irq_chip ixp2000_irq_chip = {
439 .ack = ixp2000_irq_mask,
440 .mask = ixp2000_irq_mask,
441 .unmask = ixp2000_irq_unmask
442 };
443
ixp2000_init_irq(void)444 void __init ixp2000_init_irq(void)
445 {
446 int irq;
447
448 /*
449 * Mask all sources
450 */
451 ixp2000_reg_write(IXP2000_IRQ_ENABLE_CLR, 0xffffffff);
452 ixp2000_reg_write(IXP2000_FIQ_ENABLE_CLR, 0xffffffff);
453
454 /* clear all GPIO edge/level detects */
455 ixp2000_reg_write(IXP2000_GPIO_REDR, 0);
456 ixp2000_reg_write(IXP2000_GPIO_FEDR, 0);
457 ixp2000_reg_write(IXP2000_GPIO_LSHR, 0);
458 ixp2000_reg_write(IXP2000_GPIO_LSLR, 0);
459 ixp2000_reg_write(IXP2000_GPIO_INCR, -1);
460
461 /* clear PCI interrupt sources */
462 ixp2000_reg_wrb(IXP2000_PCI_XSCALE_INT_ENABLE, 0);
463
464 /*
465 * Certain bits in the IRQ status register of the
466 * IXP2000 are reserved. Instead of trying to map
467 * things non 1:1 from bit position to IRQ number,
468 * we mark the reserved IRQs as invalid. This makes
469 * our mask/unmask code much simpler.
470 */
471 for (irq = IRQ_IXP2000_SOFT_INT; irq <= IRQ_IXP2000_THDB3; irq++) {
472 if ((1 << irq) & IXP2000_VALID_IRQ_MASK) {
473 set_irq_chip(irq, &ixp2000_irq_chip);
474 set_irq_handler(irq, handle_level_irq);
475 set_irq_flags(irq, IRQF_VALID);
476 } else set_irq_flags(irq, 0);
477 }
478
479 for (irq = IRQ_IXP2000_DRAM0_MIN_ERR; irq <= IRQ_IXP2000_SP_INT; irq++) {
480 if((1 << (irq - IRQ_IXP2000_DRAM0_MIN_ERR)) &
481 IXP2000_VALID_ERR_IRQ_MASK) {
482 set_irq_chip(irq, &ixp2000_err_irq_chip);
483 set_irq_handler(irq, handle_level_irq);
484 set_irq_flags(irq, IRQF_VALID);
485 }
486 else
487 set_irq_flags(irq, 0);
488 }
489 set_irq_chained_handler(IRQ_IXP2000_ERRSUM, ixp2000_err_irq_handler);
490
491 for (irq = IRQ_IXP2000_GPIO0; irq <= IRQ_IXP2000_GPIO7; irq++) {
492 set_irq_chip(irq, &ixp2000_GPIO_irq_chip);
493 set_irq_handler(irq, handle_level_irq);
494 set_irq_flags(irq, IRQF_VALID);
495 }
496 set_irq_chained_handler(IRQ_IXP2000_GPIO, ixp2000_GPIO_irq_handler);
497
498 /*
499 * Enable PCI irqs. The actual PCI[AB] decoding is done in
500 * entry-macro.S, so we don't need a chained handler for the
501 * PCI interrupt source.
502 */
503 ixp2000_reg_write(IXP2000_IRQ_ENABLE_SET, (1 << IRQ_IXP2000_PCI));
504 for (irq = IRQ_IXP2000_PCIA; irq <= IRQ_IXP2000_PCIB; irq++) {
505 set_irq_chip(irq, &ixp2000_pci_irq_chip);
506 set_irq_handler(irq, handle_level_irq);
507 set_irq_flags(irq, IRQF_VALID);
508 }
509 }
510
511