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.
33 #include <linux/init.h>
35 #include <linux/pm_legacy.h>
36 #include <linux/sysctl.h>
37 #include <linux/jiffies.h>
39 #include <asm/uaccess.h>
40 #include <asm/cacheflush.h>
41 #include <asm/mach-au1x00/au1000.h>
47 # define DPRINTK(fmt, args...) printk("%s: " fmt, __func__, ## args)
49 # define DPRINTK(fmt, args...)
52 static void au1000_calibrate_delay(void);
54 extern unsigned long save_local_and_disable(int controller);
55 extern void restore_local_and_enable(int controller, unsigned long mask);
56 extern void local_enable_irq(unsigned int irq_nr);
58 static DEFINE_SPINLOCK(pm_lock);
60 /* We need to save/restore a bunch of core registers that are
61 * either volatile or reset to some state across a processor sleep.
62 * If reading a register doesn't provide a proper result for a
63 * later restore, we have to provide a function for loading that
64 * register and save a copy.
66 * We only have to save/restore registers that aren't otherwise
67 * done as part of a driver pm_* function.
69 static unsigned int sleep_aux_pll_cntrl;
70 static unsigned int sleep_cpu_pll_cntrl;
71 static unsigned int sleep_pin_function;
72 static unsigned int sleep_uart0_inten;
73 static unsigned int sleep_uart0_fifoctl;
74 static unsigned int sleep_uart0_linectl;
75 static unsigned int sleep_uart0_clkdiv;
76 static unsigned int sleep_uart0_enable;
77 static unsigned int sleep_usbhost_enable;
78 static unsigned int sleep_usbdev_enable;
79 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);
95 extern void save_au1xxx_intctl(void);
96 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.
111 sleep_usbhost_enable = au_readl(USB_HOST_CONFIG);
113 /* There appears to be some undocumented reset register....
115 au_writel(0, 0xb0100004); au_sync();
116 au_writel(0, USB_HOST_CONFIG); au_sync();
118 sleep_usbdev_enable = au_readl(USBD_ENABLE);
119 au_writel(0, USBD_ENABLE); au_sync();
121 /* Save interrupt controller state.
123 save_au1xxx_intctl();
127 sleep_aux_pll_cntrl = au_readl(SYS_AUXPLL);
129 /* We don't really need to do this one, but unless we
130 * write it again it won't have a valid value if we
133 sleep_cpu_pll_cntrl = au_readl(SYS_CPUPLL);
135 sleep_pin_function = au_readl(SYS_PINFUNC);
137 /* Save the static memory controller configuration.
139 sleep_static_memctlr[0][0] = au_readl(MEM_STCFG0);
140 sleep_static_memctlr[0][1] = au_readl(MEM_STTIME0);
141 sleep_static_memctlr[0][2] = au_readl(MEM_STADDR0);
142 sleep_static_memctlr[1][0] = au_readl(MEM_STCFG1);
143 sleep_static_memctlr[1][1] = au_readl(MEM_STTIME1);
144 sleep_static_memctlr[1][2] = au_readl(MEM_STADDR1);
145 sleep_static_memctlr[2][0] = au_readl(MEM_STCFG2);
146 sleep_static_memctlr[2][1] = au_readl(MEM_STTIME2);
147 sleep_static_memctlr[2][2] = au_readl(MEM_STADDR2);
148 sleep_static_memctlr[3][0] = au_readl(MEM_STCFG3);
149 sleep_static_memctlr[3][1] = au_readl(MEM_STTIME3);
150 sleep_static_memctlr[3][2] = au_readl(MEM_STADDR3);
154 restore_core_regs(void)
156 extern void restore_au1xxx_intctl(void);
157 extern void wakeup_counter0_adjust(void);
159 au_writel(sleep_aux_pll_cntrl, SYS_AUXPLL); au_sync();
160 au_writel(sleep_cpu_pll_cntrl, SYS_CPUPLL); au_sync();
161 au_writel(sleep_pin_function, SYS_PINFUNC); au_sync();
163 /* Restore the static memory controller configuration.
165 au_writel(sleep_static_memctlr[0][0], MEM_STCFG0);
166 au_writel(sleep_static_memctlr[0][1], MEM_STTIME0);
167 au_writel(sleep_static_memctlr[0][2], MEM_STADDR0);
168 au_writel(sleep_static_memctlr[1][0], MEM_STCFG1);
169 au_writel(sleep_static_memctlr[1][1], MEM_STTIME1);
170 au_writel(sleep_static_memctlr[1][2], MEM_STADDR1);
171 au_writel(sleep_static_memctlr[2][0], MEM_STCFG2);
172 au_writel(sleep_static_memctlr[2][1], MEM_STTIME2);
173 au_writel(sleep_static_memctlr[2][2], MEM_STADDR2);
174 au_writel(sleep_static_memctlr[3][0], MEM_STCFG3);
175 au_writel(sleep_static_memctlr[3][1], MEM_STTIME3);
176 au_writel(sleep_static_memctlr[3][2], MEM_STADDR3);
178 /* Enable the UART if it was enabled before sleep.
179 * I guess I should define module control bits........
181 if (sleep_uart0_enable & 0x02) {
182 au_writel(0, UART0_ADDR + UART_MOD_CNTRL); au_sync();
183 au_writel(1, UART0_ADDR + UART_MOD_CNTRL); au_sync();
184 au_writel(3, UART0_ADDR + UART_MOD_CNTRL); au_sync();
185 au_writel(sleep_uart0_inten, UART0_ADDR + UART_IER); au_sync();
186 au_writel(sleep_uart0_fifoctl, UART0_ADDR + UART_FCR); au_sync();
187 au_writel(sleep_uart0_linectl, UART0_ADDR + UART_LCR); au_sync();
188 au_writel(sleep_uart0_clkdiv, UART0_ADDR + UART_CLK); au_sync();
191 restore_au1xxx_intctl();
192 wakeup_counter0_adjust();
195 unsigned long suspend_mode;
197 void wakeup_from_suspend(void)
204 unsigned long wakeup, flags;
205 extern void save_and_sleep(void);
207 spin_lock_irqsave(&pm_lock, flags);
213 /** The code below is all system dependent and we should probably
214 ** have a function call out of here to set this up. You need
215 ** to configure the GPIO or timer interrupts that will bring
217 ** For testing, the TOY counter wakeup is useful.
221 au_writel(au_readl(SYS_PINSTATERD) & ~(1 << 11), SYS_PINSTATERD);
223 /* gpio 6 can cause a wake up event */
224 wakeup = au_readl(SYS_WAKEMSK);
225 wakeup &= ~(1 << 8); /* turn off match20 wakeup */
226 wakeup |= 1 << 6; /* turn on gpio 6 wakeup */
228 /* For testing, allow match20 to wake us up.
230 #ifdef SLEEP_TEST_TIMEOUT
231 wakeup_counter0_set(sleep_ticks);
233 wakeup = 1 << 8; /* turn on match20 wakeup */
236 au_writel(1, SYS_WAKESRC); /* clear cause */
238 au_writel(wakeup, SYS_WAKEMSK);
243 /* after a wakeup, the cpu vectors back to 0x1fc00000 so
244 * it's up to the boot code to get us back here.
247 spin_unlock_irqrestore(&pm_lock, flags);
251 static int pm_do_sleep(ctl_table * ctl, int write, struct file *file,
252 void __user *buffer, size_t * len, loff_t *ppos)
255 #ifdef SLEEP_TEST_TIMEOUT
256 #define TMPBUFLEN2 16
257 char buf[TMPBUFLEN2], *p;
263 #ifdef SLEEP_TEST_TIMEOUT
264 if (*len > TMPBUFLEN2 - 1) {
267 if (copy_from_user(buf, buffer, *len)) {
272 sleep_ticks = simple_strtoul(p, &p, 0);
274 retval = pm_send_all(PM_SUSPEND, (void *) 2);
280 retval = pm_send_all(PM_RESUME, (void *) 0);
285 static int pm_do_suspend(ctl_table * ctl, int write, struct file *file,
286 void __user *buffer, size_t * len, loff_t *ppos)
293 retval = pm_send_all(PM_SUSPEND, (void *) 2);
298 retval = pm_send_all(PM_RESUME, (void *) 0);
304 static int pm_do_freq(ctl_table * ctl, int write, struct file *file,
305 void __user *buffer, size_t * len, loff_t *ppos)
308 unsigned long val, pll;
310 #define MAX_CPU_FREQ 396
311 char buf[TMPBUFLEN], *p;
312 unsigned long flags, intc0_mask, intc1_mask;
313 unsigned long old_baud_base, old_cpu_freq, baud_rate, old_clk,
315 unsigned long new_baud_base, new_cpu_freq, new_clk, new_refresh;
317 spin_lock_irqsave(&pm_lock, flags);
321 /* Parse the new frequency */
322 if (*len > TMPBUFLEN - 1) {
323 spin_unlock_irqrestore(&pm_lock, flags);
326 if (copy_from_user(buf, buffer, *len)) {
327 spin_unlock_irqrestore(&pm_lock, flags);
332 val = simple_strtoul(p, &p, 0);
333 if (val > MAX_CPU_FREQ) {
334 spin_unlock_irqrestore(&pm_lock, flags);
339 if ((pll > 33) || (pll < 7)) { /* 396 MHz max, 84 MHz min */
340 /* revisit this for higher speed cpus */
341 spin_unlock_irqrestore(&pm_lock, flags);
345 old_baud_base = get_au1x00_uart_baud_base();
346 old_cpu_freq = get_au1x00_speed();
348 new_cpu_freq = pll * 12 * 1000000;
349 new_baud_base = (new_cpu_freq / (2 * ((int)(au_readl(SYS_POWERCTRL)&0x03) + 2) * 16));
350 set_au1x00_speed(new_cpu_freq);
351 set_au1x00_uart_baud_base(new_baud_base);
353 old_refresh = au_readl(MEM_SDREFCFG) & 0x1ffffff;
355 ((old_refresh * new_cpu_freq) /
356 old_cpu_freq) | (au_readl(MEM_SDREFCFG) & ~0x1ffffff);
358 au_writel(pll, SYS_CPUPLL);
360 au_writel(new_refresh, MEM_SDREFCFG);
363 for (i = 0; i < 4; i++) {
365 (UART_BASE + UART_MOD_CNTRL +
366 i * 0x00100000) == 3) {
368 au_readl(UART_BASE + UART_CLK +
370 // baud_rate = baud_base/clk
371 baud_rate = old_baud_base / old_clk;
372 /* we won't get an exact baud rate and the error
373 * could be significant enough that our new
374 * calculation will result in a clock that will
375 * give us a baud rate that's too far off from
376 * what we really want.
378 if (baud_rate > 100000)
380 else if (baud_rate > 50000)
382 else if (baud_rate > 30000)
384 else if (baud_rate > 17000)
388 // new_clk = new_baud_base/baud_rate
389 new_clk = new_baud_base / baud_rate;
391 UART_BASE + UART_CLK +
400 * We don't want _any_ interrupts other than match20. Otherwise our
401 * au1000_calibrate_delay() calculation will be off, potentially a lot.
403 intc0_mask = save_local_and_disable(0);
404 intc1_mask = save_local_and_disable(1);
405 local_enable_irq(AU1000_TOY_MATCH2_INT);
406 spin_unlock_irqrestore(&pm_lock, flags);
407 au1000_calibrate_delay();
408 restore_local_and_enable(0, intc0_mask);
409 restore_local_and_enable(1, intc1_mask);
415 static struct ctl_table pm_table[] = {
417 .ctl_name = CTL_UNNUMBERED,
418 .procname = "suspend",
422 .proc_handler = &pm_do_suspend
425 .ctl_name = CTL_UNNUMBERED,
430 .proc_handler = &pm_do_sleep
433 .ctl_name = CTL_UNNUMBERED,
438 .proc_handler = &pm_do_freq
443 static struct ctl_table pm_dir_table[] = {
445 .ctl_name = CTL_UNNUMBERED,
454 * Initialize power interface
456 static int __init pm_init(void)
458 register_sysctl_table(pm_dir_table);
466 * This is right out of init/main.c
469 /* This is the number of bits of precision for the loops_per_jiffy. Each
470 bit takes on average 1.5/HZ seconds. This (like the original) is a little
474 static void au1000_calibrate_delay(void)
476 unsigned long ticks, loopbit;
477 int lps_precision = LPS_PREC;
479 loops_per_jiffy = (1 << 12);
481 while (loops_per_jiffy <<= 1) {
482 /* wait for "start of" clock tick */
484 while (ticks == jiffies)
488 __delay(loops_per_jiffy);
489 ticks = jiffies - ticks;
494 /* Do a binary approximation to get loops_per_jiffy set to equal one clock
495 (up to lps_precision bits) */
496 loops_per_jiffy >>= 1;
497 loopbit = loops_per_jiffy;
498 while (lps_precision-- && (loopbit >>= 1)) {
499 loops_per_jiffy |= loopbit;
501 while (ticks == jiffies);
503 __delay(loops_per_jiffy);
504 if (jiffies != ticks) /* longer than 1 tick */
505 loops_per_jiffy &= ~loopbit;
508 #endif /* CONFIG_PM */