2 * BRIEF MODULE DESCRIPTION
3 * Au1000 Power Management routines.
5 * Copyright 2001 MontaVista Software Inc.
6 * Author: MontaVista Software, Inc.
7 * ppopov@mvista.com or source@mvista.com
9 * Some of the routines are right out of init/main.c, whose
10 * copyrights apply here.
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
20 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
24 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 * You should have received a copy of the GNU General Public License along
29 * with this program; if not, write to the Free Software Foundation, Inc.,
30 * 675 Mass Ave, Cambridge, MA 02139, USA.
32 #include <linux/init.h>
34 #include <linux/pm_legacy.h>
35 #include <linux/slab.h>
36 #include <linux/sysctl.h>
37 #include <linux/jiffies.h>
39 #include <asm/string.h>
40 #include <asm/uaccess.h>
42 #include <asm/system.h>
43 #include <asm/cacheflush.h>
44 #include <asm/mach-au1x00/au1000.h>
50 # define DPRINTK(fmt, args...) printk("%s: " fmt, __FUNCTION__ , ## args)
52 # define DPRINTK(fmt, args...)
55 static void au1000_calibrate_delay(void);
57 extern void set_au1x00_speed(unsigned int new_freq);
58 extern unsigned int get_au1x00_speed(void);
59 extern unsigned long get_au1x00_uart_baud_base(void);
60 extern void set_au1x00_uart_baud_base(unsigned long new_baud_base);
61 extern unsigned long save_local_and_disable(int controller);
62 extern void restore_local_and_enable(int controller, unsigned long mask);
63 extern void local_enable_irq(unsigned int irq_nr);
65 static DEFINE_SPINLOCK(pm_lock);
67 /* We need to save/restore a bunch of core registers that are
68 * either volatile or reset to some state across a processor sleep.
69 * If reading a register doesn't provide a proper result for a
70 * later restore, we have to provide a function for loading that
71 * register and save a copy.
73 * We only have to save/restore registers that aren't otherwise
74 * done as part of a driver pm_* function.
76 static unsigned int sleep_aux_pll_cntrl;
77 static unsigned int sleep_cpu_pll_cntrl;
78 static unsigned int sleep_pin_function;
79 static unsigned int sleep_uart0_inten;
80 static unsigned int sleep_uart0_fifoctl;
81 static unsigned int sleep_uart0_linectl;
82 static unsigned int sleep_uart0_clkdiv;
83 static unsigned int sleep_uart0_enable;
84 static unsigned int sleep_usbhost_enable;
85 static unsigned int sleep_usbdev_enable;
86 static unsigned int sleep_static_memctlr[4][3];
88 /* Define this to cause the value you write to /proc/sys/pm/sleep to
89 * set the TOY timer for the amount of time you want to sleep.
90 * This is done mainly for testing, but may be useful in other cases.
91 * The value is number of 32KHz ticks to sleep.
93 #define SLEEP_TEST_TIMEOUT 1
94 #ifdef SLEEP_TEST_TIMEOUT
95 static int sleep_ticks;
96 void wakeup_counter0_set(int ticks);
102 extern void save_au1xxx_intctl(void);
103 extern void pm_eth0_shutdown(void);
105 /* Do the serial ports.....these really should be a pm_*
106 * registered function by the driver......but of course the
107 * standard serial driver doesn't understand our Au1xxx
110 sleep_uart0_inten = au_readl(UART0_ADDR + UART_IER);
111 sleep_uart0_fifoctl = au_readl(UART0_ADDR + UART_FCR);
112 sleep_uart0_linectl = au_readl(UART0_ADDR + UART_LCR);
113 sleep_uart0_clkdiv = au_readl(UART0_ADDR + UART_CLK);
114 sleep_uart0_enable = au_readl(UART0_ADDR + UART_MOD_CNTRL);
116 /* Shutdown USB host/device.
118 sleep_usbhost_enable = au_readl(USB_HOST_CONFIG);
120 /* There appears to be some undocumented reset register....
122 au_writel(0, 0xb0100004); au_sync();
123 au_writel(0, USB_HOST_CONFIG); au_sync();
125 sleep_usbdev_enable = au_readl(USBD_ENABLE);
126 au_writel(0, USBD_ENABLE); au_sync();
128 /* Save interrupt controller state.
130 save_au1xxx_intctl();
134 sleep_aux_pll_cntrl = au_readl(SYS_AUXPLL);
136 /* We don't really need to do this one, but unless we
137 * write it again it won't have a valid value if we
140 sleep_cpu_pll_cntrl = au_readl(SYS_CPUPLL);
142 sleep_pin_function = au_readl(SYS_PINFUNC);
144 /* Save the static memory controller configuration.
146 sleep_static_memctlr[0][0] = au_readl(MEM_STCFG0);
147 sleep_static_memctlr[0][1] = au_readl(MEM_STTIME0);
148 sleep_static_memctlr[0][2] = au_readl(MEM_STADDR0);
149 sleep_static_memctlr[1][0] = au_readl(MEM_STCFG1);
150 sleep_static_memctlr[1][1] = au_readl(MEM_STTIME1);
151 sleep_static_memctlr[1][2] = au_readl(MEM_STADDR1);
152 sleep_static_memctlr[2][0] = au_readl(MEM_STCFG2);
153 sleep_static_memctlr[2][1] = au_readl(MEM_STTIME2);
154 sleep_static_memctlr[2][2] = au_readl(MEM_STADDR2);
155 sleep_static_memctlr[3][0] = au_readl(MEM_STCFG3);
156 sleep_static_memctlr[3][1] = au_readl(MEM_STTIME3);
157 sleep_static_memctlr[3][2] = au_readl(MEM_STADDR3);
161 restore_core_regs(void)
163 extern void restore_au1xxx_intctl(void);
164 extern void wakeup_counter0_adjust(void);
166 au_writel(sleep_aux_pll_cntrl, SYS_AUXPLL); au_sync();
167 au_writel(sleep_cpu_pll_cntrl, SYS_CPUPLL); au_sync();
168 au_writel(sleep_pin_function, SYS_PINFUNC); au_sync();
170 /* Restore the static memory controller configuration.
172 au_writel(sleep_static_memctlr[0][0], MEM_STCFG0);
173 au_writel(sleep_static_memctlr[0][1], MEM_STTIME0);
174 au_writel(sleep_static_memctlr[0][2], MEM_STADDR0);
175 au_writel(sleep_static_memctlr[1][0], MEM_STCFG1);
176 au_writel(sleep_static_memctlr[1][1], MEM_STTIME1);
177 au_writel(sleep_static_memctlr[1][2], MEM_STADDR1);
178 au_writel(sleep_static_memctlr[2][0], MEM_STCFG2);
179 au_writel(sleep_static_memctlr[2][1], MEM_STTIME2);
180 au_writel(sleep_static_memctlr[2][2], MEM_STADDR2);
181 au_writel(sleep_static_memctlr[3][0], MEM_STCFG3);
182 au_writel(sleep_static_memctlr[3][1], MEM_STTIME3);
183 au_writel(sleep_static_memctlr[3][2], MEM_STADDR3);
185 /* Enable the UART if it was enabled before sleep.
186 * I guess I should define module control bits........
188 if (sleep_uart0_enable & 0x02) {
189 au_writel(0, UART0_ADDR + UART_MOD_CNTRL); au_sync();
190 au_writel(1, UART0_ADDR + UART_MOD_CNTRL); au_sync();
191 au_writel(3, UART0_ADDR + UART_MOD_CNTRL); au_sync();
192 au_writel(sleep_uart0_inten, UART0_ADDR + UART_IER); au_sync();
193 au_writel(sleep_uart0_fifoctl, UART0_ADDR + UART_FCR); au_sync();
194 au_writel(sleep_uart0_linectl, UART0_ADDR + UART_LCR); au_sync();
195 au_writel(sleep_uart0_clkdiv, UART0_ADDR + UART_CLK); au_sync();
198 restore_au1xxx_intctl();
199 wakeup_counter0_adjust();
202 unsigned long suspend_mode;
204 void wakeup_from_suspend(void)
211 unsigned long wakeup, flags;
212 extern void save_and_sleep(void);
214 spin_lock_irqsave(&pm_lock, flags);
220 /** The code below is all system dependent and we should probably
221 ** have a function call out of here to set this up. You need
222 ** to configure the GPIO or timer interrupts that will bring
224 ** For testing, the TOY counter wakeup is useful.
228 au_writel(au_readl(SYS_PINSTATERD) & ~(1 << 11), SYS_PINSTATERD);
230 /* gpio 6 can cause a wake up event */
231 wakeup = au_readl(SYS_WAKEMSK);
232 wakeup &= ~(1 << 8); /* turn off match20 wakeup */
233 wakeup |= 1 << 6; /* turn on gpio 6 wakeup */
235 /* For testing, allow match20 to wake us up.
237 #ifdef SLEEP_TEST_TIMEOUT
238 wakeup_counter0_set(sleep_ticks);
240 wakeup = 1 << 8; /* turn on match20 wakeup */
243 au_writel(1, SYS_WAKESRC); /* clear cause */
245 au_writel(wakeup, SYS_WAKEMSK);
250 /* after a wakeup, the cpu vectors back to 0x1fc00000 so
251 * it's up to the boot code to get us back here.
254 spin_unlock_irqrestore(&pm_lock, flags);
258 static int pm_do_sleep(ctl_table * ctl, int write, struct file *file,
259 void __user *buffer, size_t * len, loff_t *ppos)
262 #ifdef SLEEP_TEST_TIMEOUT
263 #define TMPBUFLEN2 16
264 char buf[TMPBUFLEN2], *p;
270 #ifdef SLEEP_TEST_TIMEOUT
271 if (*len > TMPBUFLEN2 - 1) {
274 if (copy_from_user(buf, buffer, *len)) {
279 sleep_ticks = simple_strtoul(p, &p, 0);
281 retval = pm_send_all(PM_SUSPEND, (void *) 2);
287 retval = pm_send_all(PM_RESUME, (void *) 0);
292 static int pm_do_suspend(ctl_table * ctl, int write, struct file *file,
293 void __user *buffer, size_t * len, loff_t *ppos)
300 retval = pm_send_all(PM_SUSPEND, (void *) 2);
305 retval = pm_send_all(PM_RESUME, (void *) 0);
311 static int pm_do_freq(ctl_table * ctl, int write, struct file *file,
312 void __user *buffer, size_t * len, loff_t *ppos)
315 unsigned long val, pll;
317 #define MAX_CPU_FREQ 396
318 char buf[TMPBUFLEN], *p;
319 unsigned long flags, intc0_mask, intc1_mask;
320 unsigned long old_baud_base, old_cpu_freq, baud_rate, old_clk,
322 unsigned long new_baud_base, new_cpu_freq, new_clk, new_refresh;
324 spin_lock_irqsave(&pm_lock, flags);
328 /* Parse the new frequency */
329 if (*len > TMPBUFLEN - 1) {
330 spin_unlock_irqrestore(&pm_lock, flags);
333 if (copy_from_user(buf, buffer, *len)) {
334 spin_unlock_irqrestore(&pm_lock, flags);
339 val = simple_strtoul(p, &p, 0);
340 if (val > MAX_CPU_FREQ) {
341 spin_unlock_irqrestore(&pm_lock, flags);
346 if ((pll > 33) || (pll < 7)) { /* 396 MHz max, 84 MHz min */
347 /* revisit this for higher speed cpus */
348 spin_unlock_irqrestore(&pm_lock, flags);
352 old_baud_base = get_au1x00_uart_baud_base();
353 old_cpu_freq = get_au1x00_speed();
355 new_cpu_freq = pll * 12 * 1000000;
356 new_baud_base = (new_cpu_freq / (2 * ((int)(au_readl(SYS_POWERCTRL)&0x03) + 2) * 16));
357 set_au1x00_speed(new_cpu_freq);
358 set_au1x00_uart_baud_base(new_baud_base);
360 old_refresh = au_readl(MEM_SDREFCFG) & 0x1ffffff;
362 ((old_refresh * new_cpu_freq) /
363 old_cpu_freq) | (au_readl(MEM_SDREFCFG) & ~0x1ffffff);
365 au_writel(pll, SYS_CPUPLL);
367 au_writel(new_refresh, MEM_SDREFCFG);
370 for (i = 0; i < 4; i++) {
372 (UART_BASE + UART_MOD_CNTRL +
373 i * 0x00100000) == 3) {
375 au_readl(UART_BASE + UART_CLK +
377 // baud_rate = baud_base/clk
378 baud_rate = old_baud_base / old_clk;
379 /* we won't get an exact baud rate and the error
380 * could be significant enough that our new
381 * calculation will result in a clock that will
382 * give us a baud rate that's too far off from
383 * what we really want.
385 if (baud_rate > 100000)
387 else if (baud_rate > 50000)
389 else if (baud_rate > 30000)
391 else if (baud_rate > 17000)
395 // new_clk = new_baud_base/baud_rate
396 new_clk = new_baud_base / baud_rate;
398 UART_BASE + UART_CLK +
407 * We don't want _any_ interrupts other than match20. Otherwise our
408 * au1000_calibrate_delay() calculation will be off, potentially a lot.
410 intc0_mask = save_local_and_disable(0);
411 intc1_mask = save_local_and_disable(1);
412 local_enable_irq(AU1000_TOY_MATCH2_INT);
413 spin_unlock_irqrestore(&pm_lock, flags);
414 au1000_calibrate_delay();
415 restore_local_and_enable(0, intc0_mask);
416 restore_local_and_enable(1, intc1_mask);
422 static struct ctl_table pm_table[] = {
424 .ctl_name = CTL_UNNUMBERED,
425 .procname = "suspend",
429 .proc_handler = &pm_do_suspend
432 .ctl_name = CTL_UNNUMBERED,
437 .proc_handler = &pm_do_sleep
440 .ctl_name = CTL_UNNUMBERED,
445 .proc_handler = &pm_do_freq
450 static struct ctl_table pm_dir_table[] = {
452 .ctl_name = CTL_UNNUMBERED,
461 * Initialize power interface
463 static int __init pm_init(void)
465 register_sysctl_table(pm_dir_table);
473 * This is right out of init/main.c
476 /* This is the number of bits of precision for the loops_per_jiffy. Each
477 bit takes on average 1.5/HZ seconds. This (like the original) is a little
481 static void au1000_calibrate_delay(void)
483 unsigned long ticks, loopbit;
484 int lps_precision = LPS_PREC;
486 loops_per_jiffy = (1 << 12);
488 while (loops_per_jiffy <<= 1) {
489 /* wait for "start of" clock tick */
491 while (ticks == jiffies)
495 __delay(loops_per_jiffy);
496 ticks = jiffies - ticks;
501 /* Do a binary approximation to get loops_per_jiffy set to equal one clock
502 (up to lps_precision bits) */
503 loops_per_jiffy >>= 1;
504 loopbit = loops_per_jiffy;
505 while (lps_precision-- && (loopbit >>= 1)) {
506 loops_per_jiffy |= loopbit;
508 while (ticks == jiffies);
510 __delay(loops_per_jiffy);
511 if (jiffies != ticks) /* longer than 1 tick */
512 loops_per_jiffy &= ~loopbit;
515 #endif /* CONFIG_PM */