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Merge tag 'tags/cleanup2-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[mirror_ubuntu-artful-kernel.git] / arch / arm / mach-integrator / integrator_ap.c
1 /*
2 * linux/arch/arm/mach-integrator/integrator_ap.c
3 *
4 * Copyright (C) 2000-2003 Deep Blue Solutions Ltd
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20 #include <linux/types.h>
21 #include <linux/kernel.h>
22 #include <linux/init.h>
23 #include <linux/list.h>
24 #include <linux/platform_device.h>
25 #include <linux/slab.h>
26 #include <linux/string.h>
27 #include <linux/syscore_ops.h>
28 #include <linux/amba/bus.h>
29 #include <linux/amba/kmi.h>
30 #include <linux/clocksource.h>
31 #include <linux/clockchips.h>
32 #include <linux/interrupt.h>
33 #include <linux/io.h>
34 #include <linux/irqchip/versatile-fpga.h>
35 #include <linux/mtd/physmap.h>
36 #include <linux/clk.h>
37 #include <linux/platform_data/clk-integrator.h>
38 #include <linux/of_irq.h>
39 #include <linux/of_address.h>
40 #include <linux/of_platform.h>
41 #include <linux/stat.h>
42 #include <linux/sys_soc.h>
43 #include <linux/termios.h>
44 #include <linux/sched_clock.h>
45 #include <linux/clk-provider.h>
46
47 #include <asm/hardware/arm_timer.h>
48 #include <asm/setup.h>
49 #include <asm/param.h> /* HZ */
50 #include <asm/mach-types.h>
51
52 #include <asm/mach/arch.h>
53 #include <asm/mach/irq.h>
54 #include <asm/mach/map.h>
55 #include <asm/mach/time.h>
56
57 #include "hardware.h"
58 #include "cm.h"
59 #include "common.h"
60 #include "pci_v3.h"
61 #include "lm.h"
62
63 /* Base address to the AP system controller */
64 void __iomem *ap_syscon_base;
65 /* Base address to the external bus interface */
66 static void __iomem *ebi_base;
67
68
69 /*
70 * All IO addresses are mapped onto VA 0xFFFx.xxxx, where x.xxxx
71 * is the (PA >> 12).
72 *
73 * Setup a VA for the Integrator interrupt controller (for header #0,
74 * just for now).
75 */
76 #define VA_IC_BASE __io_address(INTEGRATOR_IC_BASE)
77
78 /*
79 * Logical Physical
80 * ef000000 Cache flush
81 * f1100000 11000000 System controller registers
82 * f1300000 13000000 Counter/Timer
83 * f1400000 14000000 Interrupt controller
84 * f1600000 16000000 UART 0
85 * f1700000 17000000 UART 1
86 * f1a00000 1a000000 Debug LEDs
87 * f1b00000 1b000000 GPIO
88 */
89
90 static struct map_desc ap_io_desc[] __initdata __maybe_unused = {
91 {
92 .virtual = IO_ADDRESS(INTEGRATOR_CT_BASE),
93 .pfn = __phys_to_pfn(INTEGRATOR_CT_BASE),
94 .length = SZ_4K,
95 .type = MT_DEVICE
96 }, {
97 .virtual = IO_ADDRESS(INTEGRATOR_IC_BASE),
98 .pfn = __phys_to_pfn(INTEGRATOR_IC_BASE),
99 .length = SZ_4K,
100 .type = MT_DEVICE
101 }, {
102 .virtual = IO_ADDRESS(INTEGRATOR_UART0_BASE),
103 .pfn = __phys_to_pfn(INTEGRATOR_UART0_BASE),
104 .length = SZ_4K,
105 .type = MT_DEVICE
106 }, {
107 .virtual = IO_ADDRESS(INTEGRATOR_DBG_BASE),
108 .pfn = __phys_to_pfn(INTEGRATOR_DBG_BASE),
109 .length = SZ_4K,
110 .type = MT_DEVICE
111 }, {
112 .virtual = IO_ADDRESS(INTEGRATOR_AP_GPIO_BASE),
113 .pfn = __phys_to_pfn(INTEGRATOR_AP_GPIO_BASE),
114 .length = SZ_4K,
115 .type = MT_DEVICE
116 }
117 };
118
119 static void __init ap_map_io(void)
120 {
121 iotable_init(ap_io_desc, ARRAY_SIZE(ap_io_desc));
122 pci_v3_early_init();
123 }
124
125 #ifdef CONFIG_PM
126 static unsigned long ic_irq_enable;
127
128 static int irq_suspend(void)
129 {
130 ic_irq_enable = readl(VA_IC_BASE + IRQ_ENABLE);
131 return 0;
132 }
133
134 static void irq_resume(void)
135 {
136 /* disable all irq sources */
137 cm_clear_irqs();
138 writel(-1, VA_IC_BASE + IRQ_ENABLE_CLEAR);
139 writel(-1, VA_IC_BASE + FIQ_ENABLE_CLEAR);
140
141 writel(ic_irq_enable, VA_IC_BASE + IRQ_ENABLE_SET);
142 }
143 #else
144 #define irq_suspend NULL
145 #define irq_resume NULL
146 #endif
147
148 static struct syscore_ops irq_syscore_ops = {
149 .suspend = irq_suspend,
150 .resume = irq_resume,
151 };
152
153 static int __init irq_syscore_init(void)
154 {
155 register_syscore_ops(&irq_syscore_ops);
156
157 return 0;
158 }
159
160 device_initcall(irq_syscore_init);
161
162 /*
163 * Flash handling.
164 */
165 static int ap_flash_init(struct platform_device *dev)
166 {
167 u32 tmp;
168
169 writel(INTEGRATOR_SC_CTRL_nFLVPPEN | INTEGRATOR_SC_CTRL_nFLWP,
170 ap_syscon_base + INTEGRATOR_SC_CTRLC_OFFSET);
171
172 tmp = readl(ebi_base + INTEGRATOR_EBI_CSR1_OFFSET) |
173 INTEGRATOR_EBI_WRITE_ENABLE;
174 writel(tmp, ebi_base + INTEGRATOR_EBI_CSR1_OFFSET);
175
176 if (!(readl(ebi_base + INTEGRATOR_EBI_CSR1_OFFSET)
177 & INTEGRATOR_EBI_WRITE_ENABLE)) {
178 writel(0xa05f, ebi_base + INTEGRATOR_EBI_LOCK_OFFSET);
179 writel(tmp, ebi_base + INTEGRATOR_EBI_CSR1_OFFSET);
180 writel(0, ebi_base + INTEGRATOR_EBI_LOCK_OFFSET);
181 }
182 return 0;
183 }
184
185 static void ap_flash_exit(struct platform_device *dev)
186 {
187 u32 tmp;
188
189 writel(INTEGRATOR_SC_CTRL_nFLVPPEN | INTEGRATOR_SC_CTRL_nFLWP,
190 ap_syscon_base + INTEGRATOR_SC_CTRLC_OFFSET);
191
192 tmp = readl(ebi_base + INTEGRATOR_EBI_CSR1_OFFSET) &
193 ~INTEGRATOR_EBI_WRITE_ENABLE;
194 writel(tmp, ebi_base + INTEGRATOR_EBI_CSR1_OFFSET);
195
196 if (readl(ebi_base + INTEGRATOR_EBI_CSR1_OFFSET) &
197 INTEGRATOR_EBI_WRITE_ENABLE) {
198 writel(0xa05f, ebi_base + INTEGRATOR_EBI_LOCK_OFFSET);
199 writel(tmp, ebi_base + INTEGRATOR_EBI_CSR1_OFFSET);
200 writel(0, ebi_base + INTEGRATOR_EBI_LOCK_OFFSET);
201 }
202 }
203
204 static void ap_flash_set_vpp(struct platform_device *pdev, int on)
205 {
206 if (on)
207 writel(INTEGRATOR_SC_CTRL_nFLVPPEN,
208 ap_syscon_base + INTEGRATOR_SC_CTRLS_OFFSET);
209 else
210 writel(INTEGRATOR_SC_CTRL_nFLVPPEN,
211 ap_syscon_base + INTEGRATOR_SC_CTRLC_OFFSET);
212 }
213
214 static struct physmap_flash_data ap_flash_data = {
215 .width = 4,
216 .init = ap_flash_init,
217 .exit = ap_flash_exit,
218 .set_vpp = ap_flash_set_vpp,
219 };
220
221 /*
222 * For the PL010 found in the Integrator/AP some of the UART control is
223 * implemented in the system controller and accessed using a callback
224 * from the driver.
225 */
226 static void integrator_uart_set_mctrl(struct amba_device *dev,
227 void __iomem *base, unsigned int mctrl)
228 {
229 unsigned int ctrls = 0, ctrlc = 0, rts_mask, dtr_mask;
230 u32 phybase = dev->res.start;
231
232 if (phybase == INTEGRATOR_UART0_BASE) {
233 /* UART0 */
234 rts_mask = 1 << 4;
235 dtr_mask = 1 << 5;
236 } else {
237 /* UART1 */
238 rts_mask = 1 << 6;
239 dtr_mask = 1 << 7;
240 }
241
242 if (mctrl & TIOCM_RTS)
243 ctrlc |= rts_mask;
244 else
245 ctrls |= rts_mask;
246
247 if (mctrl & TIOCM_DTR)
248 ctrlc |= dtr_mask;
249 else
250 ctrls |= dtr_mask;
251
252 __raw_writel(ctrls, ap_syscon_base + INTEGRATOR_SC_CTRLS_OFFSET);
253 __raw_writel(ctrlc, ap_syscon_base + INTEGRATOR_SC_CTRLC_OFFSET);
254 }
255
256 struct amba_pl010_data ap_uart_data = {
257 .set_mctrl = integrator_uart_set_mctrl,
258 };
259
260 /*
261 * Where is the timer (VA)?
262 */
263 #define TIMER0_VA_BASE __io_address(INTEGRATOR_TIMER0_BASE)
264 #define TIMER1_VA_BASE __io_address(INTEGRATOR_TIMER1_BASE)
265 #define TIMER2_VA_BASE __io_address(INTEGRATOR_TIMER2_BASE)
266
267 static unsigned long timer_reload;
268
269 static u64 notrace integrator_read_sched_clock(void)
270 {
271 return -readl((void __iomem *) TIMER2_VA_BASE + TIMER_VALUE);
272 }
273
274 static void integrator_clocksource_init(unsigned long inrate,
275 void __iomem *base)
276 {
277 u32 ctrl = TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC;
278 unsigned long rate = inrate;
279
280 if (rate >= 1500000) {
281 rate /= 16;
282 ctrl |= TIMER_CTRL_DIV16;
283 }
284
285 writel(0xffff, base + TIMER_LOAD);
286 writel(ctrl, base + TIMER_CTRL);
287
288 clocksource_mmio_init(base + TIMER_VALUE, "timer2",
289 rate, 200, 16, clocksource_mmio_readl_down);
290 sched_clock_register(integrator_read_sched_clock, 16, rate);
291 }
292
293 static void __iomem * clkevt_base;
294
295 /*
296 * IRQ handler for the timer
297 */
298 static irqreturn_t integrator_timer_interrupt(int irq, void *dev_id)
299 {
300 struct clock_event_device *evt = dev_id;
301
302 /* clear the interrupt */
303 writel(1, clkevt_base + TIMER_INTCLR);
304
305 evt->event_handler(evt);
306
307 return IRQ_HANDLED;
308 }
309
310 static void clkevt_set_mode(enum clock_event_mode mode, struct clock_event_device *evt)
311 {
312 u32 ctrl = readl(clkevt_base + TIMER_CTRL) & ~TIMER_CTRL_ENABLE;
313
314 /* Disable timer */
315 writel(ctrl, clkevt_base + TIMER_CTRL);
316
317 switch (mode) {
318 case CLOCK_EVT_MODE_PERIODIC:
319 /* Enable the timer and start the periodic tick */
320 writel(timer_reload, clkevt_base + TIMER_LOAD);
321 ctrl |= TIMER_CTRL_PERIODIC | TIMER_CTRL_ENABLE;
322 writel(ctrl, clkevt_base + TIMER_CTRL);
323 break;
324 case CLOCK_EVT_MODE_ONESHOT:
325 /* Leave the timer disabled, .set_next_event will enable it */
326 ctrl &= ~TIMER_CTRL_PERIODIC;
327 writel(ctrl, clkevt_base + TIMER_CTRL);
328 break;
329 case CLOCK_EVT_MODE_UNUSED:
330 case CLOCK_EVT_MODE_SHUTDOWN:
331 case CLOCK_EVT_MODE_RESUME:
332 default:
333 /* Just leave in disabled state */
334 break;
335 }
336
337 }
338
339 static int clkevt_set_next_event(unsigned long next, struct clock_event_device *evt)
340 {
341 unsigned long ctrl = readl(clkevt_base + TIMER_CTRL);
342
343 writel(ctrl & ~TIMER_CTRL_ENABLE, clkevt_base + TIMER_CTRL);
344 writel(next, clkevt_base + TIMER_LOAD);
345 writel(ctrl | TIMER_CTRL_ENABLE, clkevt_base + TIMER_CTRL);
346
347 return 0;
348 }
349
350 static struct clock_event_device integrator_clockevent = {
351 .name = "timer1",
352 .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
353 .set_mode = clkevt_set_mode,
354 .set_next_event = clkevt_set_next_event,
355 .rating = 300,
356 };
357
358 static struct irqaction integrator_timer_irq = {
359 .name = "timer",
360 .flags = IRQF_TIMER | IRQF_IRQPOLL,
361 .handler = integrator_timer_interrupt,
362 .dev_id = &integrator_clockevent,
363 };
364
365 static void integrator_clockevent_init(unsigned long inrate,
366 void __iomem *base, int irq)
367 {
368 unsigned long rate = inrate;
369 unsigned int ctrl = 0;
370
371 clkevt_base = base;
372 /* Calculate and program a divisor */
373 if (rate > 0x100000 * HZ) {
374 rate /= 256;
375 ctrl |= TIMER_CTRL_DIV256;
376 } else if (rate > 0x10000 * HZ) {
377 rate /= 16;
378 ctrl |= TIMER_CTRL_DIV16;
379 }
380 timer_reload = rate / HZ;
381 writel(ctrl, clkevt_base + TIMER_CTRL);
382
383 setup_irq(irq, &integrator_timer_irq);
384 clockevents_config_and_register(&integrator_clockevent,
385 rate,
386 1,
387 0xffffU);
388 }
389
390 void __init ap_init_early(void)
391 {
392 }
393
394 static void __init ap_of_timer_init(void)
395 {
396 struct device_node *node;
397 const char *path;
398 void __iomem *base;
399 int err;
400 int irq;
401 struct clk *clk;
402 unsigned long rate;
403
404 of_clk_init(NULL);
405
406 err = of_property_read_string(of_aliases,
407 "arm,timer-primary", &path);
408 if (WARN_ON(err))
409 return;
410 node = of_find_node_by_path(path);
411 base = of_iomap(node, 0);
412 if (WARN_ON(!base))
413 return;
414
415 clk = of_clk_get(node, 0);
416 BUG_ON(IS_ERR(clk));
417 clk_prepare_enable(clk);
418 rate = clk_get_rate(clk);
419
420 writel(0, base + TIMER_CTRL);
421 integrator_clocksource_init(rate, base);
422
423 err = of_property_read_string(of_aliases,
424 "arm,timer-secondary", &path);
425 if (WARN_ON(err))
426 return;
427 node = of_find_node_by_path(path);
428 base = of_iomap(node, 0);
429 if (WARN_ON(!base))
430 return;
431 irq = irq_of_parse_and_map(node, 0);
432
433 clk = of_clk_get(node, 0);
434 BUG_ON(IS_ERR(clk));
435 clk_prepare_enable(clk);
436 rate = clk_get_rate(clk);
437
438 writel(0, base + TIMER_CTRL);
439 integrator_clockevent_init(rate, base, irq);
440 }
441
442 static const struct of_device_id fpga_irq_of_match[] __initconst = {
443 { .compatible = "arm,versatile-fpga-irq", .data = fpga_irq_of_init, },
444 { /* Sentinel */ }
445 };
446
447 static void __init ap_init_irq_of(void)
448 {
449 cm_init();
450 of_irq_init(fpga_irq_of_match);
451 }
452
453 /* For the Device Tree, add in the UART callbacks as AUXDATA */
454 static struct of_dev_auxdata ap_auxdata_lookup[] __initdata = {
455 OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_RTC_BASE,
456 "rtc", NULL),
457 OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART0_BASE,
458 "uart0", &ap_uart_data),
459 OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART1_BASE,
460 "uart1", &ap_uart_data),
461 OF_DEV_AUXDATA("arm,primecell", KMI0_BASE,
462 "kmi0", NULL),
463 OF_DEV_AUXDATA("arm,primecell", KMI1_BASE,
464 "kmi1", NULL),
465 OF_DEV_AUXDATA("cfi-flash", INTEGRATOR_FLASH_BASE,
466 "physmap-flash", &ap_flash_data),
467 { /* sentinel */ },
468 };
469
470 static const struct of_device_id ap_syscon_match[] = {
471 { .compatible = "arm,integrator-ap-syscon"},
472 { },
473 };
474
475 static const struct of_device_id ebi_match[] = {
476 { .compatible = "arm,external-bus-interface"},
477 { },
478 };
479
480 static void __init ap_init_of(void)
481 {
482 unsigned long sc_dec;
483 struct device_node *root;
484 struct device_node *syscon;
485 struct device_node *ebi;
486 struct device *parent;
487 struct soc_device *soc_dev;
488 struct soc_device_attribute *soc_dev_attr;
489 u32 ap_sc_id;
490 int err;
491 int i;
492
493 /* Here we create an SoC device for the root node */
494 root = of_find_node_by_path("/");
495 if (!root)
496 return;
497
498 syscon = of_find_matching_node(root, ap_syscon_match);
499 if (!syscon)
500 return;
501 ebi = of_find_matching_node(root, ebi_match);
502 if (!ebi)
503 return;
504
505 ap_syscon_base = of_iomap(syscon, 0);
506 if (!ap_syscon_base)
507 return;
508 ebi_base = of_iomap(ebi, 0);
509 if (!ebi_base)
510 return;
511
512 ap_sc_id = readl(ap_syscon_base);
513
514 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
515 if (!soc_dev_attr)
516 return;
517
518 err = of_property_read_string(root, "compatible",
519 &soc_dev_attr->soc_id);
520 if (err)
521 return;
522 err = of_property_read_string(root, "model", &soc_dev_attr->machine);
523 if (err)
524 return;
525 soc_dev_attr->family = "Integrator";
526 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%c",
527 'A' + (ap_sc_id & 0x0f));
528
529 soc_dev = soc_device_register(soc_dev_attr);
530 if (IS_ERR(soc_dev)) {
531 kfree(soc_dev_attr->revision);
532 kfree(soc_dev_attr);
533 return;
534 }
535
536 parent = soc_device_to_device(soc_dev);
537 integrator_init_sysfs(parent, ap_sc_id);
538
539 of_platform_populate(root, of_default_bus_match_table,
540 ap_auxdata_lookup, parent);
541
542 sc_dec = readl(ap_syscon_base + INTEGRATOR_SC_DEC_OFFSET);
543 for (i = 0; i < 4; i++) {
544 struct lm_device *lmdev;
545
546 if ((sc_dec & (16 << i)) == 0)
547 continue;
548
549 lmdev = kzalloc(sizeof(struct lm_device), GFP_KERNEL);
550 if (!lmdev)
551 continue;
552
553 lmdev->resource.start = 0xc0000000 + 0x10000000 * i;
554 lmdev->resource.end = lmdev->resource.start + 0x0fffffff;
555 lmdev->resource.flags = IORESOURCE_MEM;
556 lmdev->irq = irq_of_parse_and_map(syscon, i);
557 lmdev->id = i;
558
559 lm_device_register(lmdev);
560 }
561 }
562
563 static const char * ap_dt_board_compat[] = {
564 "arm,integrator-ap",
565 NULL,
566 };
567
568 DT_MACHINE_START(INTEGRATOR_AP_DT, "ARM Integrator/AP (Device Tree)")
569 .reserve = integrator_reserve,
570 .map_io = ap_map_io,
571 .init_early = ap_init_early,
572 .init_irq = ap_init_irq_of,
573 .handle_irq = fpga_handle_irq,
574 .init_time = ap_of_timer_init,
575 .init_machine = ap_init_of,
576 .restart = integrator_restart,
577 .dt_compat = ap_dt_board_compat,
578 MACHINE_END
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