2 * BRIEF MODULE DESCRIPTION
3 * Au1xx0 Power Management routines.
5 * Copyright 2001, 2008 MontaVista Software Inc.
6 * Author: MontaVista Software, Inc. <source@mvista.com>
8 * Some of the routines are right out of init/main.c, whose
9 * copyrights apply here.
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.
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.
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.
32 #include <linux/init.h>
34 #include <linux/sysctl.h>
35 #include <linux/jiffies.h>
37 #include <asm/uaccess.h>
38 #include <asm/cacheflush.h>
39 #include <asm/mach-au1x00/au1000.h>
45 #define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __func__, ## args)
47 #define DPRINTK(fmt, args...)
50 static void au1000_calibrate_delay(void);
52 extern unsigned long save_local_and_disable(int controller
);
53 extern void restore_local_and_enable(int controller
, unsigned long mask
);
54 extern void local_enable_irq(unsigned int irq_nr
);
56 static DEFINE_SPINLOCK(pm_lock
);
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.
65 * We only have to save/restore registers that aren't otherwise
66 * done as part of a driver pm_* function.
68 static unsigned int sleep_aux_pll_cntrl
;
69 static unsigned int sleep_cpu_pll_cntrl
;
70 static unsigned int sleep_pin_function
;
71 static unsigned int sleep_uart0_inten
;
72 static unsigned int sleep_uart0_fifoctl
;
73 static unsigned int sleep_uart0_linectl
;
74 static unsigned int sleep_uart0_clkdiv
;
75 static unsigned int sleep_uart0_enable
;
76 static unsigned int sleep_usbhost_enable
;
77 static unsigned int sleep_usbdev_enable
;
78 static unsigned int sleep_static_memctlr
[4][3];
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.
86 #define SLEEP_TEST_TIMEOUT 1
87 #ifdef SLEEP_TEST_TIMEOUT
88 static int sleep_ticks
;
89 void wakeup_counter0_set(int ticks
);
92 static void save_core_regs(void)
94 extern void save_au1xxx_intctl(void);
95 extern void pm_eth0_shutdown(void);
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
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
);
109 /* Shutdown USB host/device. */
110 sleep_usbhost_enable
= au_readl(USB_HOST_CONFIG
);
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();
116 sleep_usbdev_enable
= au_readl(USBD_ENABLE
);
117 au_writel(0, USBD_ENABLE
); au_sync();
119 /* Save interrupt controller state. */
120 save_au1xxx_intctl();
122 /* Clocks and PLLs. */
123 sleep_aux_pll_cntrl
= au_readl(SYS_AUXPLL
);
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
130 sleep_cpu_pll_cntrl
= au_readl(SYS_CPUPLL
);
132 sleep_pin_function
= au_readl(SYS_PINFUNC
);
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
);
149 static void restore_core_regs(void)
151 extern void restore_au1xxx_intctl(void);
152 extern void wakeup_counter0_adjust(void);
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();
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
);
173 * Enable the UART if it was enabled before sleep.
174 * I guess I should define module control bits........
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();
186 restore_au1xxx_intctl();
187 wakeup_counter0_adjust();
190 unsigned long suspend_mode
;
192 void wakeup_from_suspend(void)
199 unsigned long wakeup
, flags
;
200 extern void save_and_sleep(void);
202 spin_lock_irqsave(&pm_lock
, flags
);
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
213 ** For testing, the TOY counter wakeup is useful.
216 au_writel(au_readl(SYS_PINSTATERD
) & ~(1 << 11), SYS_PINSTATERD
);
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 */
223 /* For testing, allow match20 to wake us up. */
224 #ifdef SLEEP_TEST_TIMEOUT
225 wakeup_counter0_set(sleep_ticks
);
227 wakeup
= 1 << 8; /* turn on match20 wakeup */
230 au_writel(1, SYS_WAKESRC
); /* clear cause */
232 au_writel(wakeup
, SYS_WAKEMSK
);
238 * After a wakeup, the cpu vectors back to 0x1fc00000, so
239 * it's up to the boot code to get us back here.
242 spin_unlock_irqrestore(&pm_lock
, flags
);
246 static int pm_do_sleep(ctl_table
*ctl
, int write
, struct file
*file
,
247 void __user
*buffer
, size_t *len
, loff_t
*ppos
)
249 #ifdef SLEEP_TEST_TIMEOUT
250 #define TMPBUFLEN2 16
251 char buf
[TMPBUFLEN2
], *p
;
257 #ifdef SLEEP_TEST_TIMEOUT
258 if (*len
> TMPBUFLEN2
- 1)
260 if (copy_from_user(buf
, buffer
, *len
))
264 sleep_ticks
= simple_strtoul(p
, &p
, 0);
272 static int pm_do_freq(ctl_table
*ctl
, int write
, struct file
*file
,
273 void __user
*buffer
, size_t *len
, loff_t
*ppos
)
276 unsigned long val
, pll
;
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
;
285 spin_lock_irqsave(&pm_lock
, flags
);
289 /* Parse the new frequency */
290 if (*len
> TMPBUFLEN
- 1) {
291 spin_unlock_irqrestore(&pm_lock
, flags
);
294 if (copy_from_user(buf
, buffer
, *len
)) {
295 spin_unlock_irqrestore(&pm_lock
, flags
);
300 val
= simple_strtoul(p
, &p
, 0);
301 if (val
> MAX_CPU_FREQ
) {
302 spin_unlock_irqrestore(&pm_lock
, flags
);
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
);
313 old_baud_base
= get_au1x00_uart_baud_base();
314 old_cpu_freq
= get_au1x00_speed();
316 new_cpu_freq
= pll
* 12 * 1000000;
317 new_baud_base
= (new_cpu_freq
/ (2 * ((int)(au_readl(SYS_POWERCTRL
)
319 set_au1x00_speed(new_cpu_freq
);
320 set_au1x00_uart_baud_base(new_baud_base
);
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);
326 au_writel(pll
, SYS_CPUPLL
);
328 au_writel(new_refresh
, MEM_SDREFCFG
);
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
+
336 baud_rate
= old_baud_base
/ old_clk
;
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.
344 if (baud_rate
> 100000)
346 else if (baud_rate
> 50000)
348 else if (baud_rate
> 30000)
350 else if (baud_rate
> 17000)
354 new_clk
= new_baud_base
/ baud_rate
;
355 au_writel(new_clk
, UART_BASE
+ UART_CLK
+
362 * We don't want _any_ interrupts other than match20. Otherwise our
363 * au1000_calibrate_delay() calculation will be off, potentially a lot.
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
);
377 static struct ctl_table pm_table
[] = {
379 .ctl_name
= CTL_UNNUMBERED
,
384 .proc_handler
= &pm_do_sleep
387 .ctl_name
= CTL_UNNUMBERED
,
392 .proc_handler
= &pm_do_freq
397 static struct ctl_table pm_dir_table
[] = {
399 .ctl_name
= CTL_UNNUMBERED
,
408 * Initialize power interface
410 static int __init
pm_init(void)
412 register_sysctl_table(pm_dir_table
);
419 * This is right out of init/main.c
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%.
429 static void au1000_calibrate_delay(void)
431 unsigned long ticks
, loopbit
;
432 int lps_precision
= LPS_PREC
;
434 loops_per_jiffy
= 1 << 12;
436 while (loops_per_jiffy
<<= 1) {
437 /* Wait for "start of" clock tick */
439 while (ticks
== jiffies
)
443 __delay(loops_per_jiffy
);
444 ticks
= jiffies
- ticks
;
450 * Do a binary approximation to get loops_per_jiffy set to be equal
451 * one clock (up to lps_precision bits)
453 loops_per_jiffy
>>= 1;
454 loopbit
= loops_per_jiffy
;
455 while (lps_precision
-- && (loopbit
>>= 1)) {
456 loops_per_jiffy
|= loopbit
;
458 while (ticks
== jiffies
);
460 __delay(loops_per_jiffy
);
461 if (jiffies
!= ticks
) /* longer than 1 tick */
462 loops_per_jiffy
&= ~loopbit
;
465 #endif /* CONFIG_PM */