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Linux 3.11-rc3
[cris-mirror.git] / arch / arm / mach-clps711x / common.c
blob4ca2f3ca2de42efe618530332885492e4e223385
1 /*
2 * linux/arch/arm/mach-clps711x/core.c
3 *
4 * Core support for the CLPS711x-based machines.
5 *
6 * Copyright (C) 2001,2011 Deep Blue Solutions Ltd
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22 #include <linux/io.h>
23 #include <linux/init.h>
24 #include <linux/sizes.h>
25 #include <linux/interrupt.h>
26 #include <linux/irq.h>
27 #include <linux/clk.h>
28 #include <linux/clkdev.h>
29 #include <linux/clockchips.h>
30 #include <linux/clocksource.h>
31 #include <linux/clk-provider.h>
32
33 #include <asm/exception.h>
34 #include <asm/mach/irq.h>
35 #include <asm/mach/map.h>
36 #include <asm/mach/time.h>
37 #include <asm/sched_clock.h>
38 #include <asm/system_misc.h>
39
40 #include <mach/hardware.h>
41
42 static struct clk *clk_pll, *clk_bus, *clk_uart, *clk_timerl, *clk_timerh,
43 *clk_tint, *clk_spi;
44
45 /*
46 * This maps the generic CLPS711x registers
47 */
48 static struct map_desc clps711x_io_desc[] __initdata = {
49 {
50 .virtual = (unsigned long)CLPS711X_VIRT_BASE,
51 .pfn = __phys_to_pfn(CLPS711X_PHYS_BASE),
52 .length = SZ_64K,
53 .type = MT_DEVICE
54 }
55 };
56
57 void __init clps711x_map_io(void)
58 {
59 iotable_init(clps711x_io_desc, ARRAY_SIZE(clps711x_io_desc));
60 }
61
62 static void int1_mask(struct irq_data *d)
63 {
64 u32 intmr1;
65
66 intmr1 = clps_readl(INTMR1);
67 intmr1 &= ~(1 << d->irq);
68 clps_writel(intmr1, INTMR1);
69 }
70
71 static void int1_eoi(struct irq_data *d)
72 {
73 switch (d->irq) {
74 case IRQ_CSINT: clps_writel(0, COEOI); break;
75 case IRQ_TC1OI: clps_writel(0, TC1EOI); break;
76 case IRQ_TC2OI: clps_writel(0, TC2EOI); break;
77 case IRQ_RTCMI: clps_writel(0, RTCEOI); break;
78 case IRQ_TINT: clps_writel(0, TEOI); break;
79 case IRQ_UMSINT: clps_writel(0, UMSEOI); break;
80 }
81 }
82
83 static void int1_unmask(struct irq_data *d)
84 {
85 u32 intmr1;
86
87 intmr1 = clps_readl(INTMR1);
88 intmr1 |= 1 << d->irq;
89 clps_writel(intmr1, INTMR1);
90 }
91
92 static struct irq_chip int1_chip = {
93 .name = "Interrupt Vector 1",
94 .irq_eoi = int1_eoi,
95 .irq_mask = int1_mask,
96 .irq_unmask = int1_unmask,
97 };
98
99 static void int2_mask(struct irq_data *d)
100 {
101 u32 intmr2;
102
103 intmr2 = clps_readl(INTMR2);
104 intmr2 &= ~(1 << (d->irq - 16));
105 clps_writel(intmr2, INTMR2);
106 }
107
108 static void int2_eoi(struct irq_data *d)
109 {
110 switch (d->irq) {
111 case IRQ_KBDINT: clps_writel(0, KBDEOI); break;
112 }
113 }
114
115 static void int2_unmask(struct irq_data *d)
116 {
117 u32 intmr2;
118
119 intmr2 = clps_readl(INTMR2);
120 intmr2 |= 1 << (d->irq - 16);
121 clps_writel(intmr2, INTMR2);
122 }
123
124 static struct irq_chip int2_chip = {
125 .name = "Interrupt Vector 2",
126 .irq_eoi = int2_eoi,
127 .irq_mask = int2_mask,
128 .irq_unmask = int2_unmask,
129 };
130
131 static void int3_mask(struct irq_data *d)
132 {
133 u32 intmr3;
134
135 intmr3 = clps_readl(INTMR3);
136 intmr3 &= ~(1 << (d->irq - 32));
137 clps_writel(intmr3, INTMR3);
138 }
139
140 static void int3_unmask(struct irq_data *d)
141 {
142 u32 intmr3;
143
144 intmr3 = clps_readl(INTMR3);
145 intmr3 |= 1 << (d->irq - 32);
146 clps_writel(intmr3, INTMR3);
147 }
148
149 static struct irq_chip int3_chip = {
150 .name = "Interrupt Vector 3",
151 .irq_mask = int3_mask,
152 .irq_unmask = int3_unmask,
153 };
154
155 static struct {
156 int nr;
157 struct irq_chip *chip;
158 irq_flow_handler_t handle;
159 } clps711x_irqdescs[] __initdata = {
160 { IRQ_CSINT, &int1_chip, handle_fasteoi_irq, },
161 { IRQ_EINT1, &int1_chip, handle_level_irq, },
162 { IRQ_EINT2, &int1_chip, handle_level_irq, },
163 { IRQ_EINT3, &int1_chip, handle_level_irq, },
164 { IRQ_TC1OI, &int1_chip, handle_fasteoi_irq, },
165 { IRQ_TC2OI, &int1_chip, handle_fasteoi_irq, },
166 { IRQ_RTCMI, &int1_chip, handle_fasteoi_irq, },
167 { IRQ_TINT, &int1_chip, handle_fasteoi_irq, },
168 { IRQ_UTXINT1, &int1_chip, handle_level_irq, },
169 { IRQ_URXINT1, &int1_chip, handle_level_irq, },
170 { IRQ_UMSINT, &int1_chip, handle_fasteoi_irq, },
171 { IRQ_SSEOTI, &int1_chip, handle_level_irq, },
172 { IRQ_KBDINT, &int2_chip, handle_fasteoi_irq, },
173 { IRQ_SS2RX, &int2_chip, handle_level_irq, },
174 { IRQ_SS2TX, &int2_chip, handle_level_irq, },
175 { IRQ_UTXINT2, &int2_chip, handle_level_irq, },
176 { IRQ_URXINT2, &int2_chip, handle_level_irq, },
177 };
178
179 void __init clps711x_init_irq(void)
180 {
181 unsigned int i;
182
183 /* Disable interrupts */
184 clps_writel(0, INTMR1);
185 clps_writel(0, INTMR2);
186 clps_writel(0, INTMR3);
187
188 /* Clear down any pending interrupts */
189 clps_writel(0, BLEOI);
190 clps_writel(0, MCEOI);
191 clps_writel(0, COEOI);
192 clps_writel(0, TC1EOI);
193 clps_writel(0, TC2EOI);
194 clps_writel(0, RTCEOI);
195 clps_writel(0, TEOI);
196 clps_writel(0, UMSEOI);
197 clps_writel(0, KBDEOI);
198 clps_writel(0, SRXEOF);
199 clps_writel(0xffffffff, DAISR);
200
201 for (i = 0; i < ARRAY_SIZE(clps711x_irqdescs); i++) {
202 irq_set_chip_and_handler(clps711x_irqdescs[i].nr,
203 clps711x_irqdescs[i].chip,
204 clps711x_irqdescs[i].handle);
205 set_irq_flags(clps711x_irqdescs[i].nr,
206 IRQF_VALID | IRQF_PROBE);
207 }
208
209 if (IS_ENABLED(CONFIG_FIQ)) {
210 init_FIQ(0);
211 irq_set_chip_and_handler(IRQ_DAIINT, &int3_chip,
212 handle_bad_irq);
213 set_irq_flags(IRQ_DAIINT,
214 IRQF_VALID | IRQF_PROBE | IRQF_NOAUTOEN);
215 }
216 }
217
218 static inline u32 fls16(u32 x)
219 {
220 u32 r = 15;
221
222 if (!(x & 0xff00)) {
223 x <<= 8;
224 r -= 8;
225 }
226 if (!(x & 0xf000)) {
227 x <<= 4;
228 r -= 4;
229 }
230 if (!(x & 0xc000)) {
231 x <<= 2;
232 r -= 2;
233 }
234 if (!(x & 0x8000))
235 r--;
236
237 return r;
238 }
239
240 asmlinkage void __exception_irq_entry clps711x_handle_irq(struct pt_regs *regs)
241 {
242 do {
243 u32 irqstat;
244 void __iomem *base = CLPS711X_VIRT_BASE;
245
246 irqstat = readw_relaxed(base + INTSR1) &
247 readw_relaxed(base + INTMR1);
248 if (irqstat)
249 handle_IRQ(fls16(irqstat), regs);
250
251 irqstat = readw_relaxed(base + INTSR2) &
252 readw_relaxed(base + INTMR2);
253 if (irqstat) {
254 handle_IRQ(fls16(irqstat) + 16, regs);
255 continue;
256 }
257
258 break;
259 } while (1);
260 }
261
262 static u32 notrace clps711x_sched_clock_read(void)
263 {
264 return ~readw_relaxed(CLPS711X_VIRT_BASE + TC1D);
265 }
266
267 static void clps711x_clockevent_set_mode(enum clock_event_mode mode,
268 struct clock_event_device *evt)
269 {
270 disable_irq(IRQ_TC2OI);
271
272 switch (mode) {
273 case CLOCK_EVT_MODE_PERIODIC:
274 enable_irq(IRQ_TC2OI);
275 break;
276 case CLOCK_EVT_MODE_ONESHOT:
277 /* Not supported */
278 case CLOCK_EVT_MODE_SHUTDOWN:
279 case CLOCK_EVT_MODE_UNUSED:
280 case CLOCK_EVT_MODE_RESUME:
281 /* Left event sources disabled, no more interrupts appear */
282 break;
283 }
284 }
285
286 static struct clock_event_device clockevent_clps711x = {
287 .name = "clps711x-clockevent",
288 .rating = 300,
289 .features = CLOCK_EVT_FEAT_PERIODIC,
290 .set_mode = clps711x_clockevent_set_mode,
291 };
292
293 static irqreturn_t clps711x_timer_interrupt(int irq, void *dev_id)
294 {
295 clockevent_clps711x.event_handler(&clockevent_clps711x);
296
297 return IRQ_HANDLED;
298 }
299
300 static struct irqaction clps711x_timer_irq = {
301 .name = "clps711x-timer",
302 .flags = IRQF_TIMER | IRQF_IRQPOLL,
303 .handler = clps711x_timer_interrupt,
304 };
305
306 static void add_fixed_clk(struct clk *clk, const char *name, int rate)
307 {
308 clk = clk_register_fixed_rate(NULL, name, NULL, CLK_IS_ROOT, rate);
309 clk_register_clkdev(clk, name, NULL);
310 }
311
312 void __init clps711x_timer_init(void)
313 {
314 int osc, ext, pll, cpu, bus, timl, timh, uart, spi;
315 u32 tmp;
316
317 osc = 3686400;
318 ext = 13000000;
319
320 tmp = clps_readl(PLLR) >> 24;
321 if (tmp)
322 pll = (osc * tmp) / 2;
323 else
324 pll = 73728000; /* Default value */
325
326 tmp = clps_readl(SYSFLG2);
327 if (tmp & SYSFLG2_CKMODE) {
328 cpu = ext;
329 bus = cpu;
330 spi = 135400;
331 pll = 0;
332 } else {
333 cpu = pll;
334 if (cpu >= 36864000)
335 bus = cpu / 2;
336 else
337 bus = 36864000 / 2;
338 spi = cpu / 576;
339 }
340
341 uart = bus / 10;
342
343 if (tmp & SYSFLG2_CKMODE) {
344 tmp = clps_readl(SYSCON2);
345 if (tmp & SYSCON2_OSTB)
346 timh = ext / 26;
347 else
348 timh = 541440;
349 } else
350 timh = DIV_ROUND_CLOSEST(cpu, 144);
351
352 timl = DIV_ROUND_CLOSEST(timh, 256);
353
354 /* All clocks are fixed */
355 add_fixed_clk(clk_pll, "pll", pll);
356 add_fixed_clk(clk_bus, "bus", bus);
357 add_fixed_clk(clk_uart, "uart", uart);
358 add_fixed_clk(clk_timerl, "timer_lf", timl);
359 add_fixed_clk(clk_timerh, "timer_hf", timh);
360 add_fixed_clk(clk_tint, "tint", 64);
361 add_fixed_clk(clk_spi, "spi", spi);
362
363 pr_info("CPU frequency set at %i Hz.\n", cpu);
364
365 /* Start Timer1 in free running mode (Low frequency) */
366 tmp = clps_readl(SYSCON1) & ~(SYSCON1_TC1S | SYSCON1_TC1M);
367 clps_writel(tmp, SYSCON1);
368
369 setup_sched_clock(clps711x_sched_clock_read, 16, timl);
370
371 clocksource_mmio_init(CLPS711X_VIRT_BASE + TC1D,
372 "clps711x_clocksource", timl, 300, 16,
373 clocksource_mmio_readw_down);
374
375 /* Set Timer2 prescaler */
376 clps_writew(DIV_ROUND_CLOSEST(timh, HZ), TC2D);
377
378 /* Start Timer2 in prescale mode (High frequency)*/
379 tmp = clps_readl(SYSCON1) | SYSCON1_TC2M | SYSCON1_TC2S;
380 clps_writel(tmp, SYSCON1);
381
382 clockevents_config_and_register(&clockevent_clps711x, timh, 0, 0);
383
384 setup_irq(IRQ_TC2OI, &clps711x_timer_irq);
385 }
386
387 void clps711x_restart(enum reboot_mode mode, const char *cmd)
388 {
389 soft_restart(0);
390 }
391
392 static void clps711x_idle(void)
393 {
394 clps_writel(1, HALT);
395 asm("mov r0, r0");
396 asm("mov r0, r0");
397 }
398
399 void __init clps711x_init_early(void)
400 {
401 arm_pm_idle = clps711x_idle;
402 }
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