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-rw-r--r--arch/mips/alchemy/common/power.c465
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diff --git a/arch/mips/alchemy/common/power.c b/arch/mips/alchemy/common/power.c
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1/*
2 * BRIEF MODULE DESCRIPTION
3 * Au1xx0 Power Management routines.
4 *
5 * Copyright 2001, 2008 MontaVista Software Inc.
6 * Author: MontaVista Software, Inc. <source@mvista.com>
7 *
8 * Some of the routines are right out of init/main.c, whose
9 * copyrights apply here.
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
15 *
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
19 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
22 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
23 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * You should have received a copy of the GNU General Public License along
28 * with this program; if not, write to the Free Software Foundation, Inc.,
29 * 675 Mass Ave, Cambridge, MA 02139, USA.
30 */
31
32#include <linux/init.h>
33#include <linux/pm.h>
34#include <linux/sysctl.h>
35#include <linux/jiffies.h>
36
37#include <asm/uaccess.h>
38#include <asm/cacheflush.h>
39#include <asm/mach-au1x00/au1000.h>
40
41#ifdef CONFIG_PM
42
43#define DEBUG 1
44#ifdef DEBUG
45#define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __func__, ## args)
46#else
47#define DPRINTK(fmt, args...)
48#endif
49
50static void au1000_calibrate_delay(void);
51
52extern unsigned long save_local_and_disable(int controller);
53extern void restore_local_and_enable(int controller, unsigned long mask);
54extern void local_enable_irq(unsigned int irq_nr);
55
56static DEFINE_SPINLOCK(pm_lock);
57
58/*
59 * We need to save/restore a bunch of core registers that are
60 * either volatile or reset to some state across a processor sleep.
61 * If reading a register doesn't provide a proper result for a
62 * later restore, we have to provide a function for loading that
63 * register and save a copy.
64 *
65 * We only have to save/restore registers that aren't otherwise
66 * done as part of a driver pm_* function.
67 */
68static unsigned int sleep_aux_pll_cntrl;
69static unsigned int sleep_cpu_pll_cntrl;
70static unsigned int sleep_pin_function;
71static unsigned int sleep_uart0_inten;
72static unsigned int sleep_uart0_fifoctl;
73static unsigned int sleep_uart0_linectl;
74static unsigned int sleep_uart0_clkdiv;
75static unsigned int sleep_uart0_enable;
76static unsigned int sleep_usbhost_enable;
77static unsigned int sleep_usbdev_enable;
78static unsigned int sleep_static_memctlr[4][3];
79
80/*
81 * Define this to cause the value you write to /proc/sys/pm/sleep to
82 * set the TOY timer for the amount of time you want to sleep.
83 * This is done mainly for testing, but may be useful in other cases.
84 * The value is number of 32KHz ticks to sleep.
85 */
86#define SLEEP_TEST_TIMEOUT 1
87#ifdef SLEEP_TEST_TIMEOUT
88static int sleep_ticks;
89void wakeup_counter0_set(int ticks);
90#endif
91
92static void save_core_regs(void)
93{
94 extern void save_au1xxx_intctl(void);
95 extern void pm_eth0_shutdown(void);
96
97 /*
98 * Do the serial ports.....these really should be a pm_*
99 * registered function by the driver......but of course the
100 * standard serial driver doesn't understand our Au1xxx
101 * unique registers.
102 */
103 sleep_uart0_inten = au_readl(UART0_ADDR + UART_IER);
104 sleep_uart0_fifoctl = au_readl(UART0_ADDR + UART_FCR);
105 sleep_uart0_linectl = au_readl(UART0_ADDR + UART_LCR);
106 sleep_uart0_clkdiv = au_readl(UART0_ADDR + UART_CLK);
107 sleep_uart0_enable = au_readl(UART0_ADDR + UART_MOD_CNTRL);
108
109 /* Shutdown USB host/device. */
110 sleep_usbhost_enable = au_readl(USB_HOST_CONFIG);
111
112 /* There appears to be some undocumented reset register.... */
113 au_writel(0, 0xb0100004); au_sync();
114 au_writel(0, USB_HOST_CONFIG); au_sync();
115
116 sleep_usbdev_enable = au_readl(USBD_ENABLE);
117 au_writel(0, USBD_ENABLE); au_sync();
118
119 /* Save interrupt controller state. */
120 save_au1xxx_intctl();
121
122 /* Clocks and PLLs. */
123 sleep_aux_pll_cntrl = au_readl(SYS_AUXPLL);
124
125 /*
126 * We don't really need to do this one, but unless we
127 * write it again it won't have a valid value if we
128 * happen to read it.
129 */
130 sleep_cpu_pll_cntrl = au_readl(SYS_CPUPLL);
131
132 sleep_pin_function = au_readl(SYS_PINFUNC);
133
134 /* Save the static memory controller configuration. */
135 sleep_static_memctlr[0][0] = au_readl(MEM_STCFG0);
136 sleep_static_memctlr[0][1] = au_readl(MEM_STTIME0);
137 sleep_static_memctlr[0][2] = au_readl(MEM_STADDR0);
138 sleep_static_memctlr[1][0] = au_readl(MEM_STCFG1);
139 sleep_static_memctlr[1][1] = au_readl(MEM_STTIME1);
140 sleep_static_memctlr[1][2] = au_readl(MEM_STADDR1);
141 sleep_static_memctlr[2][0] = au_readl(MEM_STCFG2);
142 sleep_static_memctlr[2][1] = au_readl(MEM_STTIME2);
143 sleep_static_memctlr[2][2] = au_readl(MEM_STADDR2);
144 sleep_static_memctlr[3][0] = au_readl(MEM_STCFG3);
145 sleep_static_memctlr[3][1] = au_readl(MEM_STTIME3);
146 sleep_static_memctlr[3][2] = au_readl(MEM_STADDR3);
147}
148
149static void restore_core_regs(void)
150{
151 extern void restore_au1xxx_intctl(void);
152 extern void wakeup_counter0_adjust(void);
153
154 au_writel(sleep_aux_pll_cntrl, SYS_AUXPLL); au_sync();
155 au_writel(sleep_cpu_pll_cntrl, SYS_CPUPLL); au_sync();
156 au_writel(sleep_pin_function, SYS_PINFUNC); au_sync();
157
158 /* Restore the static memory controller configuration. */
159 au_writel(sleep_static_memctlr[0][0], MEM_STCFG0);
160 au_writel(sleep_static_memctlr[0][1], MEM_STTIME0);
161 au_writel(sleep_static_memctlr[0][2], MEM_STADDR0);
162 au_writel(sleep_static_memctlr[1][0], MEM_STCFG1);
163 au_writel(sleep_static_memctlr[1][1], MEM_STTIME1);
164 au_writel(sleep_static_memctlr[1][2], MEM_STADDR1);
165 au_writel(sleep_static_memctlr[2][0], MEM_STCFG2);
166 au_writel(sleep_static_memctlr[2][1], MEM_STTIME2);
167 au_writel(sleep_static_memctlr[2][2], MEM_STADDR2);
168 au_writel(sleep_static_memctlr[3][0], MEM_STCFG3);
169 au_writel(sleep_static_memctlr[3][1], MEM_STTIME3);
170 au_writel(sleep_static_memctlr[3][2], MEM_STADDR3);
171
172 /*
173 * Enable the UART if it was enabled before sleep.
174 * I guess I should define module control bits........
175 */
176 if (sleep_uart0_enable & 0x02) {
177 au_writel(0, UART0_ADDR + UART_MOD_CNTRL); au_sync();
178 au_writel(1, UART0_ADDR + UART_MOD_CNTRL); au_sync();
179 au_writel(3, UART0_ADDR + UART_MOD_CNTRL); au_sync();
180 au_writel(sleep_uart0_inten, UART0_ADDR + UART_IER); au_sync();
181 au_writel(sleep_uart0_fifoctl, UART0_ADDR + UART_FCR); au_sync();
182 au_writel(sleep_uart0_linectl, UART0_ADDR + UART_LCR); au_sync();
183 au_writel(sleep_uart0_clkdiv, UART0_ADDR + UART_CLK); au_sync();
184 }
185
186 restore_au1xxx_intctl();
187 wakeup_counter0_adjust();
188}
189
190unsigned long suspend_mode;
191
192void wakeup_from_suspend(void)
193{
194 suspend_mode = 0;
195}
196
197int au_sleep(void)
198{
199 unsigned long wakeup, flags;
200 extern void save_and_sleep(void);
201
202 spin_lock_irqsave(&pm_lock, flags);
203
204 save_core_regs();
205
206 flush_cache_all();
207
208 /**
209 ** The code below is all system dependent and we should probably
210 ** have a function call out of here to set this up. You need
211 ** to configure the GPIO or timer interrupts that will bring
212 ** you out of sleep.
213 ** For testing, the TOY counter wakeup is useful.
214 **/
215#if 0
216 au_writel(au_readl(SYS_PINSTATERD) & ~(1 << 11), SYS_PINSTATERD);
217
218 /* GPIO 6 can cause a wake up event */
219 wakeup = au_readl(SYS_WAKEMSK);
220 wakeup &= ~(1 << 8); /* turn off match20 wakeup */
221 wakeup |= 1 << 6; /* turn on GPIO 6 wakeup */
222#else
223 /* For testing, allow match20 to wake us up. */
224#ifdef SLEEP_TEST_TIMEOUT
225 wakeup_counter0_set(sleep_ticks);
226#endif
227 wakeup = 1 << 8; /* turn on match20 wakeup */
228 wakeup = 0;
229#endif
230 au_writel(1, SYS_WAKESRC); /* clear cause */
231 au_sync();
232 au_writel(wakeup, SYS_WAKEMSK);
233 au_sync();
234
235 save_and_sleep();
236
237 /*
238 * After a wakeup, the cpu vectors back to 0x1fc00000, so
239 * it's up to the boot code to get us back here.
240 */
241 restore_core_regs();
242 spin_unlock_irqrestore(&pm_lock, flags);
243 return 0;
244}
245
246static int pm_do_sleep(ctl_table *ctl, int write, struct file *file,
247 void __user *buffer, size_t *len, loff_t *ppos)
248{
249#ifdef SLEEP_TEST_TIMEOUT
250#define TMPBUFLEN2 16
251 char buf[TMPBUFLEN2], *p;
252#endif
253
254 if (!write)
255 *len = 0;
256 else {
257#ifdef SLEEP_TEST_TIMEOUT
258 if (*len > TMPBUFLEN2 - 1)
259 return -EFAULT;
260 if (copy_from_user(buf, buffer, *len))
261 return -EFAULT;
262 buf[*len] = 0;
263 p = buf;
264 sleep_ticks = simple_strtoul(p, &p, 0);
265#endif
266
267 au_sleep();
268 }
269 return 0;
270}
271
272static int pm_do_freq(ctl_table *ctl, int write, struct file *file,
273 void __user *buffer, size_t *len, loff_t *ppos)
274{
275 int retval = 0, i;
276 unsigned long val, pll;
277#define TMPBUFLEN 64
278#define MAX_CPU_FREQ 396
279 char buf[TMPBUFLEN], *p;
280 unsigned long flags, intc0_mask, intc1_mask;
281 unsigned long old_baud_base, old_cpu_freq, old_clk, old_refresh;
282 unsigned long new_baud_base, new_cpu_freq, new_clk, new_refresh;
283 unsigned long baud_rate;
284
285 spin_lock_irqsave(&pm_lock, flags);
286 if (!write)
287 *len = 0;
288 else {
289 /* Parse the new frequency */
290 if (*len > TMPBUFLEN - 1) {
291 spin_unlock_irqrestore(&pm_lock, flags);
292 return -EFAULT;
293 }
294 if (copy_from_user(buf, buffer, *len)) {
295 spin_unlock_irqrestore(&pm_lock, flags);
296 return -EFAULT;
297 }
298 buf[*len] = 0;
299 p = buf;
300 val = simple_strtoul(p, &p, 0);
301 if (val > MAX_CPU_FREQ) {
302 spin_unlock_irqrestore(&pm_lock, flags);
303 return -EFAULT;
304 }
305
306 pll = val / 12;
307 if ((pll > 33) || (pll < 7)) { /* 396 MHz max, 84 MHz min */
308 /* Revisit this for higher speed CPUs */
309 spin_unlock_irqrestore(&pm_lock, flags);
310 return -EFAULT;
311 }
312
313 old_baud_base = get_au1x00_uart_baud_base();
314 old_cpu_freq = get_au1x00_speed();
315
316 new_cpu_freq = pll * 12 * 1000000;
317 new_baud_base = (new_cpu_freq / (2 * ((int)(au_readl(SYS_POWERCTRL)
318 & 0x03) + 2) * 16));
319 set_au1x00_speed(new_cpu_freq);
320 set_au1x00_uart_baud_base(new_baud_base);
321
322 old_refresh = au_readl(MEM_SDREFCFG) & 0x1ffffff;
323 new_refresh = ((old_refresh * new_cpu_freq) / old_cpu_freq) |
324 (au_readl(MEM_SDREFCFG) & ~0x1ffffff);
325
326 au_writel(pll, SYS_CPUPLL);
327 au_sync_delay(1);
328 au_writel(new_refresh, MEM_SDREFCFG);
329 au_sync_delay(1);
330
331 for (i = 0; i < 4; i++)
332 if (au_readl(UART_BASE + UART_MOD_CNTRL +
333 i * 0x00100000) == 3) {
334 old_clk = au_readl(UART_BASE + UART_CLK +
335 i * 0x00100000);
336 baud_rate = old_baud_base / old_clk;
337 /*
338 * We won't get an exact baud rate and the error
339 * could be significant enough that our new
340 * calculation will result in a clock that will
341 * give us a baud rate that's too far off from
342 * what we really want.
343 */
344 if (baud_rate > 100000)
345 baud_rate = 115200;
346 else if (baud_rate > 50000)
347 baud_rate = 57600;
348 else if (baud_rate > 30000)
349 baud_rate = 38400;
350 else if (baud_rate > 17000)
351 baud_rate = 19200;
352 else
353 baud_rate = 9600;
354 new_clk = new_baud_base / baud_rate;
355 au_writel(new_clk, UART_BASE + UART_CLK +
356 i * 0x00100000);
357 au_sync_delay(10);
358 }
359 }
360
361 /*
362 * We don't want _any_ interrupts other than match20. Otherwise our
363 * au1000_calibrate_delay() calculation will be off, potentially a lot.
364 */
365 intc0_mask = save_local_and_disable(0);
366 intc1_mask = save_local_and_disable(1);
367 local_enable_irq(AU1000_TOY_MATCH2_INT);
368 spin_unlock_irqrestore(&pm_lock, flags);
369 au1000_calibrate_delay();
370 restore_local_and_enable(0, intc0_mask);
371 restore_local_and_enable(1, intc1_mask);
372
373 return retval;
374}
375
376
377static struct ctl_table pm_table[] = {
378 {
379 .ctl_name = CTL_UNNUMBERED,
380 .procname = "sleep",
381 .data = NULL,
382 .maxlen = 0,
383 .mode = 0600,
384 .proc_handler = &pm_do_sleep
385 },
386 {
387 .ctl_name = CTL_UNNUMBERED,
388 .procname = "freq",
389 .data = NULL,
390 .maxlen = 0,
391 .mode = 0600,
392 .proc_handler = &pm_do_freq
393 },
394 {}
395};
396
397static struct ctl_table pm_dir_table[] = {
398 {
399 .ctl_name = CTL_UNNUMBERED,
400 .procname = "pm",
401 .mode = 0555,
402 .child = pm_table
403 },
404 {}
405};
406
407/*
408 * Initialize power interface
409 */
410static int __init pm_init(void)
411{
412 register_sysctl_table(pm_dir_table);
413 return 0;
414}
415
416__initcall(pm_init);
417
418/*
419 * This is right out of init/main.c
420 */
421
422/*
423 * This is the number of bits of precision for the loops_per_jiffy.
424 * Each bit takes on average 1.5/HZ seconds. This (like the original)
425 * is a little better than 1%.
426 */
427#define LPS_PREC 8
428
429static void au1000_calibrate_delay(void)
430{
431 unsigned long ticks, loopbit;
432 int lps_precision = LPS_PREC;
433
434 loops_per_jiffy = 1 << 12;
435
436 while (loops_per_jiffy <<= 1) {
437 /* Wait for "start of" clock tick */
438 ticks = jiffies;
439 while (ticks == jiffies)
440 /* nothing */ ;
441 /* Go ... */
442 ticks = jiffies;
443 __delay(loops_per_jiffy);
444 ticks = jiffies - ticks;
445 if (ticks)
446 break;
447 }
448
449 /*
450 * Do a binary approximation to get loops_per_jiffy set to be equal
451 * one clock (up to lps_precision bits)
452 */
453 loops_per_jiffy >>= 1;
454 loopbit = loops_per_jiffy;
455 while (lps_precision-- && (loopbit >>= 1)) {
456 loops_per_jiffy |= loopbit;
457 ticks = jiffies;
458 while (ticks == jiffies);
459 ticks = jiffies;
460 __delay(loops_per_jiffy);
461 if (jiffies != ticks) /* longer than 1 tick */
462 loops_per_jiffy &= ~loopbit;
463 }
464}
465#endif /* CONFIG_PM */
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