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 /* Quick acpi hack. This will have to change! */
67 #define ACPI_S1_SLP_TYP 19
71 static DEFINE_SPINLOCK(pm_lock);
73 /* We need to save/restore a bunch of core registers that are
74 * either volatile or reset to some state across a processor sleep.
75 * If reading a register doesn't provide a proper result for a
76 * later restore, we have to provide a function for loading that
77 * register and save a copy.
79 * We only have to save/restore registers that aren't otherwise
80 * done as part of a driver pm_* function.
82 static unsigned int sleep_aux_pll_cntrl;
83 static unsigned int sleep_cpu_pll_cntrl;
84 static unsigned int sleep_pin_function;
85 static unsigned int sleep_uart0_inten;
86 static unsigned int sleep_uart0_fifoctl;
87 static unsigned int sleep_uart0_linectl;
88 static unsigned int sleep_uart0_clkdiv;
89 static unsigned int sleep_uart0_enable;
90 static unsigned int sleep_usbhost_enable;
91 static unsigned int sleep_usbdev_enable;
92 static unsigned int sleep_static_memctlr[4][3];
94 /* Define this to cause the value you write to /proc/sys/pm/sleep to
95 * set the TOY timer for the amount of time you want to sleep.
96 * This is done mainly for testing, but may be useful in other cases.
97 * The value is number of 32KHz ticks to sleep.
99 #define SLEEP_TEST_TIMEOUT 1
100 #ifdef SLEEP_TEST_TIMEOUT
101 static int sleep_ticks;
102 void wakeup_counter0_set(int ticks);
108 extern void save_au1xxx_intctl(void);
109 extern void pm_eth0_shutdown(void);
111 /* Do the serial ports.....these really should be a pm_*
112 * registered function by the driver......but of course the
113 * standard serial driver doesn't understand our Au1xxx
116 sleep_uart0_inten = au_readl(UART0_ADDR + UART_IER);
117 sleep_uart0_fifoctl = au_readl(UART0_ADDR + UART_FCR);
118 sleep_uart0_linectl = au_readl(UART0_ADDR + UART_LCR);
119 sleep_uart0_clkdiv = au_readl(UART0_ADDR + UART_CLK);
120 sleep_uart0_enable = au_readl(UART0_ADDR + UART_MOD_CNTRL);
122 /* Shutdown USB host/device.
124 sleep_usbhost_enable = au_readl(USB_HOST_CONFIG);
126 /* There appears to be some undocumented reset register....
128 au_writel(0, 0xb0100004); au_sync();
129 au_writel(0, USB_HOST_CONFIG); au_sync();
131 sleep_usbdev_enable = au_readl(USBD_ENABLE);
132 au_writel(0, USBD_ENABLE); au_sync();
134 /* Save interrupt controller state.
136 save_au1xxx_intctl();
140 sleep_aux_pll_cntrl = au_readl(SYS_AUXPLL);
142 /* We don't really need to do this one, but unless we
143 * write it again it won't have a valid value if we
146 sleep_cpu_pll_cntrl = au_readl(SYS_CPUPLL);
148 sleep_pin_function = au_readl(SYS_PINFUNC);
150 /* Save the static memory controller configuration.
152 sleep_static_memctlr[0][0] = au_readl(MEM_STCFG0);
153 sleep_static_memctlr[0][1] = au_readl(MEM_STTIME0);
154 sleep_static_memctlr[0][2] = au_readl(MEM_STADDR0);
155 sleep_static_memctlr[1][0] = au_readl(MEM_STCFG1);
156 sleep_static_memctlr[1][1] = au_readl(MEM_STTIME1);
157 sleep_static_memctlr[1][2] = au_readl(MEM_STADDR1);
158 sleep_static_memctlr[2][0] = au_readl(MEM_STCFG2);
159 sleep_static_memctlr[2][1] = au_readl(MEM_STTIME2);
160 sleep_static_memctlr[2][2] = au_readl(MEM_STADDR2);
161 sleep_static_memctlr[3][0] = au_readl(MEM_STCFG3);
162 sleep_static_memctlr[3][1] = au_readl(MEM_STTIME3);
163 sleep_static_memctlr[3][2] = au_readl(MEM_STADDR3);
167 restore_core_regs(void)
169 extern void restore_au1xxx_intctl(void);
170 extern void wakeup_counter0_adjust(void);
172 au_writel(sleep_aux_pll_cntrl, SYS_AUXPLL); au_sync();
173 au_writel(sleep_cpu_pll_cntrl, SYS_CPUPLL); au_sync();
174 au_writel(sleep_pin_function, SYS_PINFUNC); au_sync();
176 /* Restore the static memory controller configuration.
178 au_writel(sleep_static_memctlr[0][0], MEM_STCFG0);
179 au_writel(sleep_static_memctlr[0][1], MEM_STTIME0);
180 au_writel(sleep_static_memctlr[0][2], MEM_STADDR0);
181 au_writel(sleep_static_memctlr[1][0], MEM_STCFG1);
182 au_writel(sleep_static_memctlr[1][1], MEM_STTIME1);
183 au_writel(sleep_static_memctlr[1][2], MEM_STADDR1);
184 au_writel(sleep_static_memctlr[2][0], MEM_STCFG2);
185 au_writel(sleep_static_memctlr[2][1], MEM_STTIME2);
186 au_writel(sleep_static_memctlr[2][2], MEM_STADDR2);
187 au_writel(sleep_static_memctlr[3][0], MEM_STCFG3);
188 au_writel(sleep_static_memctlr[3][1], MEM_STTIME3);
189 au_writel(sleep_static_memctlr[3][2], MEM_STADDR3);
191 /* Enable the UART if it was enabled before sleep.
192 * I guess I should define module control bits........
194 if (sleep_uart0_enable & 0x02) {
195 au_writel(0, UART0_ADDR + UART_MOD_CNTRL); au_sync();
196 au_writel(1, UART0_ADDR + UART_MOD_CNTRL); au_sync();
197 au_writel(3, UART0_ADDR + UART_MOD_CNTRL); au_sync();
198 au_writel(sleep_uart0_inten, UART0_ADDR + UART_IER); au_sync();
199 au_writel(sleep_uart0_fifoctl, UART0_ADDR + UART_FCR); au_sync();
200 au_writel(sleep_uart0_linectl, UART0_ADDR + UART_LCR); au_sync();
201 au_writel(sleep_uart0_clkdiv, UART0_ADDR + UART_CLK); au_sync();
204 restore_au1xxx_intctl();
205 wakeup_counter0_adjust();
208 unsigned long suspend_mode;
210 void wakeup_from_suspend(void)
217 unsigned long wakeup, flags;
218 extern void save_and_sleep(void);
220 spin_lock_irqsave(&pm_lock,flags);
226 /** The code below is all system dependent and we should probably
227 ** have a function call out of here to set this up. You need
228 ** to configure the GPIO or timer interrupts that will bring
230 ** For testing, the TOY counter wakeup is useful.
234 au_writel(au_readl(SYS_PINSTATERD) & ~(1 << 11), SYS_PINSTATERD);
236 /* gpio 6 can cause a wake up event */
237 wakeup = au_readl(SYS_WAKEMSK);
238 wakeup &= ~(1 << 8); /* turn off match20 wakeup */
239 wakeup |= 1 << 6; /* turn on gpio 6 wakeup */
241 /* For testing, allow match20 to wake us up.
243 #ifdef SLEEP_TEST_TIMEOUT
244 wakeup_counter0_set(sleep_ticks);
246 wakeup = 1 << 8; /* turn on match20 wakeup */
249 au_writel(1, SYS_WAKESRC); /* clear cause */
251 au_writel(wakeup, SYS_WAKEMSK);
256 /* after a wakeup, the cpu vectors back to 0x1fc00000 so
257 * it's up to the boot code to get us back here.
260 spin_unlock_irqrestore(&pm_lock, flags);
264 static int pm_do_sleep(ctl_table * ctl, int write, struct file *file,
265 void __user *buffer, size_t * len, loff_t *ppos)
268 #ifdef SLEEP_TEST_TIMEOUT
269 #define TMPBUFLEN2 16
270 char buf[TMPBUFLEN2], *p;
276 #ifdef SLEEP_TEST_TIMEOUT
277 if (*len > TMPBUFLEN2 - 1) {
280 if (copy_from_user(buf, buffer, *len)) {
285 sleep_ticks = simple_strtoul(p, &p, 0);
287 retval = pm_send_all(PM_SUSPEND, (void *) 2);
293 retval = pm_send_all(PM_RESUME, (void *) 0);
298 static int pm_do_suspend(ctl_table * ctl, int write, struct file *file,
299 void __user *buffer, size_t * len, loff_t *ppos)
306 retval = pm_send_all(PM_SUSPEND, (void *) 2);
311 retval = pm_send_all(PM_RESUME, (void *) 0);
317 static int pm_do_freq(ctl_table * ctl, int write, struct file *file,
318 void __user *buffer, size_t * len, loff_t *ppos)
321 unsigned long val, pll;
323 #define MAX_CPU_FREQ 396
324 char buf[TMPBUFLEN], *p;
325 unsigned long flags, intc0_mask, intc1_mask;
326 unsigned long old_baud_base, old_cpu_freq, baud_rate, old_clk,
328 unsigned long new_baud_base, new_cpu_freq, new_clk, new_refresh;
330 spin_lock_irqsave(&pm_lock, flags);
334 /* Parse the new frequency */
335 if (*len > TMPBUFLEN - 1) {
336 spin_unlock_irqrestore(&pm_lock, flags);
339 if (copy_from_user(buf, buffer, *len)) {
340 spin_unlock_irqrestore(&pm_lock, flags);
345 val = simple_strtoul(p, &p, 0);
346 if (val > MAX_CPU_FREQ) {
347 spin_unlock_irqrestore(&pm_lock, flags);
352 if ((pll > 33) || (pll < 7)) { /* 396 MHz max, 84 MHz min */
353 /* revisit this for higher speed cpus */
354 spin_unlock_irqrestore(&pm_lock, flags);
358 old_baud_base = get_au1x00_uart_baud_base();
359 old_cpu_freq = get_au1x00_speed();
361 new_cpu_freq = pll * 12 * 1000000;
362 new_baud_base = (new_cpu_freq / (2 * ((int)(au_readl(SYS_POWERCTRL)&0x03) + 2) * 16));
363 set_au1x00_speed(new_cpu_freq);
364 set_au1x00_uart_baud_base(new_baud_base);
366 old_refresh = au_readl(MEM_SDREFCFG) & 0x1ffffff;
368 ((old_refresh * new_cpu_freq) /
369 old_cpu_freq) | (au_readl(MEM_SDREFCFG) & ~0x1ffffff);
371 au_writel(pll, SYS_CPUPLL);
373 au_writel(new_refresh, MEM_SDREFCFG);
376 for (i = 0; i < 4; i++) {
378 (UART_BASE + UART_MOD_CNTRL +
379 i * 0x00100000) == 3) {
381 au_readl(UART_BASE + UART_CLK +
383 // baud_rate = baud_base/clk
384 baud_rate = old_baud_base / old_clk;
385 /* we won't get an exact baud rate and the error
386 * could be significant enough that our new
387 * calculation will result in a clock that will
388 * give us a baud rate that's too far off from
389 * what we really want.
391 if (baud_rate > 100000)
393 else if (baud_rate > 50000)
395 else if (baud_rate > 30000)
397 else if (baud_rate > 17000)
401 // new_clk = new_baud_base/baud_rate
402 new_clk = new_baud_base / baud_rate;
404 UART_BASE + UART_CLK +
412 /* We don't want _any_ interrupts other than
413 * match20. Otherwise our au1000_calibrate_delay()
414 * calculation will be off, potentially a lot.
416 intc0_mask = save_local_and_disable(0);
417 intc1_mask = save_local_and_disable(1);
418 local_enable_irq(AU1000_TOY_MATCH2_INT);
419 spin_unlock_irqrestore(&pm_lock, flags);
420 au1000_calibrate_delay();
421 restore_local_and_enable(0, intc0_mask);
422 restore_local_and_enable(1, intc1_mask);
427 static struct ctl_table pm_table[] = {
428 {ACPI_S1_SLP_TYP, "suspend", NULL, 0, 0600, NULL, &pm_do_suspend},
429 {ACPI_SLEEP, "sleep", NULL, 0, 0600, NULL, &pm_do_sleep},
430 {CTL_ACPI, "freq", NULL, 0, 0600, NULL, &pm_do_freq},
434 static struct ctl_table pm_dir_table[] = {
435 {CTL_ACPI, "pm", NULL, 0, 0555, pm_table},
440 * Initialize power interface
442 static int __init pm_init(void)
444 register_sysctl_table(pm_dir_table, 1);
452 * This is right out of init/main.c
455 /* This is the number of bits of precision for the loops_per_jiffy. Each
456 bit takes on average 1.5/HZ seconds. This (like the original) is a little
460 static void au1000_calibrate_delay(void)
462 unsigned long ticks, loopbit;
463 int lps_precision = LPS_PREC;
465 loops_per_jiffy = (1 << 12);
467 while (loops_per_jiffy <<= 1) {
468 /* wait for "start of" clock tick */
470 while (ticks == jiffies)
474 __delay(loops_per_jiffy);
475 ticks = jiffies - ticks;
480 /* Do a binary approximation to get loops_per_jiffy set to equal one clock
481 (up to lps_precision bits) */
482 loops_per_jiffy >>= 1;
483 loopbit = loops_per_jiffy;
484 while (lps_precision-- && (loopbit >>= 1)) {
485 loops_per_jiffy |= loopbit;
487 while (ticks == jiffies);
489 __delay(loops_per_jiffy);
490 if (jiffies != ticks) /* longer than 1 tick */
491 loops_per_jiffy &= ~loopbit;
494 #endif /* CONFIG_PM */