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/pm_legacy.h>
35 #include <linux/sysctl.h>
36 #include <linux/jiffies.h>
38 #include <asm/uaccess.h>
39 #include <asm/cacheflush.h>
40 #include <asm/mach-au1x00/au1000.h>
46 #define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __func__, ## args)
48 #define DPRINTK(fmt, args...)
51 static void au1000_calibrate_delay(void);
53 extern unsigned long save_local_and_disable(int controller);
54 extern void restore_local_and_enable(int controller, unsigned long mask);
55 extern void local_enable_irq(unsigned int irq_nr);
57 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];
82 * Define this to cause the value you write to /proc/sys/pm/sleep to
83 * set the TOY timer for the amount of time you want to sleep.
84 * This is done mainly for testing, but may be useful in other cases.
85 * The value is number of 32KHz ticks to sleep.
87 #define SLEEP_TEST_TIMEOUT 1
88 #ifdef SLEEP_TEST_TIMEOUT
89 static int sleep_ticks;
90 void wakeup_counter0_set(int ticks);
93 static void save_core_regs(void)
95 extern void save_au1xxx_intctl(void);
96 extern void pm_eth0_shutdown(void);
99 * Do the serial ports.....these really should be a pm_*
100 * registered function by the driver......but of course the
101 * standard serial driver doesn't understand our Au1xxx
104 sleep_uart0_inten = au_readl(UART0_ADDR + UART_IER);
105 sleep_uart0_fifoctl = au_readl(UART0_ADDR + UART_FCR);
106 sleep_uart0_linectl = au_readl(UART0_ADDR + UART_LCR);
107 sleep_uart0_clkdiv = au_readl(UART0_ADDR + UART_CLK);
108 sleep_uart0_enable = au_readl(UART0_ADDR + UART_MOD_CNTRL);
110 /* Shutdown USB host/device. */
111 sleep_usbhost_enable = au_readl(USB_HOST_CONFIG);
113 /* There appears to be some undocumented reset register.... */
114 au_writel(0, 0xb0100004); au_sync();
115 au_writel(0, USB_HOST_CONFIG); au_sync();
117 sleep_usbdev_enable = au_readl(USBD_ENABLE);
118 au_writel(0, USBD_ENABLE); au_sync();
120 /* Save interrupt controller state. */
121 save_au1xxx_intctl();
123 /* Clocks and PLLs. */
124 sleep_aux_pll_cntrl = au_readl(SYS_AUXPLL);
127 * We don't really need to do this one, but unless we
128 * write it again it won't have a valid value if we
131 sleep_cpu_pll_cntrl = au_readl(SYS_CPUPLL);
133 sleep_pin_function = au_readl(SYS_PINFUNC);
135 /* Save the static memory controller configuration. */
136 sleep_static_memctlr[0][0] = au_readl(MEM_STCFG0);
137 sleep_static_memctlr[0][1] = au_readl(MEM_STTIME0);
138 sleep_static_memctlr[0][2] = au_readl(MEM_STADDR0);
139 sleep_static_memctlr[1][0] = au_readl(MEM_STCFG1);
140 sleep_static_memctlr[1][1] = au_readl(MEM_STTIME1);
141 sleep_static_memctlr[1][2] = au_readl(MEM_STADDR1);
142 sleep_static_memctlr[2][0] = au_readl(MEM_STCFG2);
143 sleep_static_memctlr[2][1] = au_readl(MEM_STTIME2);
144 sleep_static_memctlr[2][2] = au_readl(MEM_STADDR2);
145 sleep_static_memctlr[3][0] = au_readl(MEM_STCFG3);
146 sleep_static_memctlr[3][1] = au_readl(MEM_STTIME3);
147 sleep_static_memctlr[3][2] = au_readl(MEM_STADDR3);
150 static void restore_core_regs(void)
152 extern void restore_au1xxx_intctl(void);
153 extern void wakeup_counter0_adjust(void);
155 au_writel(sleep_aux_pll_cntrl, SYS_AUXPLL); au_sync();
156 au_writel(sleep_cpu_pll_cntrl, SYS_CPUPLL); au_sync();
157 au_writel(sleep_pin_function, SYS_PINFUNC); au_sync();
159 /* Restore the static memory controller configuration. */
160 au_writel(sleep_static_memctlr[0][0], MEM_STCFG0);
161 au_writel(sleep_static_memctlr[0][1], MEM_STTIME0);
162 au_writel(sleep_static_memctlr[0][2], MEM_STADDR0);
163 au_writel(sleep_static_memctlr[1][0], MEM_STCFG1);
164 au_writel(sleep_static_memctlr[1][1], MEM_STTIME1);
165 au_writel(sleep_static_memctlr[1][2], MEM_STADDR1);
166 au_writel(sleep_static_memctlr[2][0], MEM_STCFG2);
167 au_writel(sleep_static_memctlr[2][1], MEM_STTIME2);
168 au_writel(sleep_static_memctlr[2][2], MEM_STADDR2);
169 au_writel(sleep_static_memctlr[3][0], MEM_STCFG3);
170 au_writel(sleep_static_memctlr[3][1], MEM_STTIME3);
171 au_writel(sleep_static_memctlr[3][2], MEM_STADDR3);
174 * Enable the UART if it was enabled before sleep.
175 * I guess I should define module control bits........
177 if (sleep_uart0_enable & 0x02) {
178 au_writel(0, UART0_ADDR + UART_MOD_CNTRL); au_sync();
179 au_writel(1, UART0_ADDR + UART_MOD_CNTRL); au_sync();
180 au_writel(3, UART0_ADDR + UART_MOD_CNTRL); au_sync();
181 au_writel(sleep_uart0_inten, UART0_ADDR + UART_IER); au_sync();
182 au_writel(sleep_uart0_fifoctl, UART0_ADDR + UART_FCR); au_sync();
183 au_writel(sleep_uart0_linectl, UART0_ADDR + UART_LCR); au_sync();
184 au_writel(sleep_uart0_clkdiv, UART0_ADDR + UART_CLK); au_sync();
187 restore_au1xxx_intctl();
188 wakeup_counter0_adjust();
191 unsigned long suspend_mode;
193 void wakeup_from_suspend(void)
200 unsigned long wakeup, flags;
201 extern void save_and_sleep(void);
203 spin_lock_irqsave(&pm_lock, flags);
210 ** The code below is all system dependent and we should probably
211 ** have a function call out of here to set this up. You need
212 ** to configure the GPIO or timer interrupts that will bring
214 ** For testing, the TOY counter wakeup is useful.
217 au_writel(au_readl(SYS_PINSTATERD) & ~(1 << 11), SYS_PINSTATERD);
219 /* GPIO 6 can cause a wake up event */
220 wakeup = au_readl(SYS_WAKEMSK);
221 wakeup &= ~(1 << 8); /* turn off match20 wakeup */
222 wakeup |= 1 << 6; /* turn on GPIO 6 wakeup */
224 /* For testing, allow match20 to wake us up. */
225 #ifdef SLEEP_TEST_TIMEOUT
226 wakeup_counter0_set(sleep_ticks);
228 wakeup = 1 << 8; /* turn on match20 wakeup */
231 au_writel(1, SYS_WAKESRC); /* clear cause */
233 au_writel(wakeup, SYS_WAKEMSK);
239 * After a wakeup, the cpu vectors back to 0x1fc00000, so
240 * it's up to the boot code to get us back here.
243 spin_unlock_irqrestore(&pm_lock, flags);
247 static int pm_do_sleep(ctl_table *ctl, int write, struct file *file,
248 void __user *buffer, size_t *len, loff_t *ppos)
250 #ifdef SLEEP_TEST_TIMEOUT
251 #define TMPBUFLEN2 16
252 char buf[TMPBUFLEN2], *p;
258 #ifdef SLEEP_TEST_TIMEOUT
259 if (*len > TMPBUFLEN2 - 1)
261 if (copy_from_user(buf, buffer, *len))
265 sleep_ticks = simple_strtoul(p, &p, 0);
273 static int pm_do_freq(ctl_table *ctl, int write, struct file *file,
274 void __user *buffer, size_t *len, loff_t *ppos)
277 unsigned long val, pll;
279 #define MAX_CPU_FREQ 396
280 char buf[TMPBUFLEN], *p;
281 unsigned long flags, intc0_mask, intc1_mask;
282 unsigned long old_baud_base, old_cpu_freq, old_clk, old_refresh;
283 unsigned long new_baud_base, new_cpu_freq, new_clk, new_refresh;
284 unsigned long baud_rate;
286 spin_lock_irqsave(&pm_lock, flags);
290 /* Parse the new frequency */
291 if (*len > TMPBUFLEN - 1) {
292 spin_unlock_irqrestore(&pm_lock, flags);
295 if (copy_from_user(buf, buffer, *len)) {
296 spin_unlock_irqrestore(&pm_lock, flags);
301 val = simple_strtoul(p, &p, 0);
302 if (val > MAX_CPU_FREQ) {
303 spin_unlock_irqrestore(&pm_lock, flags);
308 if ((pll > 33) || (pll < 7)) { /* 396 MHz max, 84 MHz min */
309 /* Revisit this for higher speed CPUs */
310 spin_unlock_irqrestore(&pm_lock, flags);
314 old_baud_base = get_au1x00_uart_baud_base();
315 old_cpu_freq = get_au1x00_speed();
317 new_cpu_freq = pll * 12 * 1000000;
318 new_baud_base = (new_cpu_freq / (2 * ((int)(au_readl(SYS_POWERCTRL)
320 set_au1x00_speed(new_cpu_freq);
321 set_au1x00_uart_baud_base(new_baud_base);
323 old_refresh = au_readl(MEM_SDREFCFG) & 0x1ffffff;
324 new_refresh = ((old_refresh * new_cpu_freq) / old_cpu_freq) |
325 (au_readl(MEM_SDREFCFG) & ~0x1ffffff);
327 au_writel(pll, SYS_CPUPLL);
329 au_writel(new_refresh, MEM_SDREFCFG);
332 for (i = 0; i < 4; i++)
333 if (au_readl(UART_BASE + UART_MOD_CNTRL +
334 i * 0x00100000) == 3) {
335 old_clk = au_readl(UART_BASE + UART_CLK +
337 baud_rate = old_baud_base / old_clk;
339 * We won't get an exact baud rate and the error
340 * could be significant enough that our new
341 * calculation will result in a clock that will
342 * give us a baud rate that's too far off from
343 * what we really want.
345 if (baud_rate > 100000)
347 else if (baud_rate > 50000)
349 else if (baud_rate > 30000)
351 else if (baud_rate > 17000)
355 new_clk = new_baud_base / baud_rate;
356 au_writel(new_clk, UART_BASE + UART_CLK +
363 * We don't want _any_ interrupts other than match20. Otherwise our
364 * au1000_calibrate_delay() calculation will be off, potentially a lot.
366 intc0_mask = save_local_and_disable(0);
367 intc1_mask = save_local_and_disable(1);
368 local_enable_irq(AU1000_TOY_MATCH2_INT);
369 spin_unlock_irqrestore(&pm_lock, flags);
370 au1000_calibrate_delay();
371 restore_local_and_enable(0, intc0_mask);
372 restore_local_and_enable(1, intc1_mask);
378 static struct ctl_table pm_table[] = {
380 .ctl_name = CTL_UNNUMBERED,
385 .proc_handler = &pm_do_sleep
388 .ctl_name = CTL_UNNUMBERED,
393 .proc_handler = &pm_do_freq
398 static struct ctl_table pm_dir_table[] = {
400 .ctl_name = CTL_UNNUMBERED,
409 * Initialize power interface
411 static int __init pm_init(void)
413 register_sysctl_table(pm_dir_table);
420 * This is right out of init/main.c
424 * This is the number of bits of precision for the loops_per_jiffy.
425 * Each bit takes on average 1.5/HZ seconds. This (like the original)
426 * is a little better than 1%.
430 static void au1000_calibrate_delay(void)
432 unsigned long ticks, loopbit;
433 int lps_precision = LPS_PREC;
435 loops_per_jiffy = 1 << 12;
437 while (loops_per_jiffy <<= 1) {
438 /* Wait for "start of" clock tick */
440 while (ticks == jiffies)
444 __delay(loops_per_jiffy);
445 ticks = jiffies - ticks;
451 * Do a binary approximation to get loops_per_jiffy set to be equal
452 * one clock (up to lps_precision bits)
454 loops_per_jiffy >>= 1;
455 loopbit = loops_per_jiffy;
456 while (lps_precision-- && (loopbit >>= 1)) {
457 loops_per_jiffy |= loopbit;
459 while (ticks == jiffies);
461 __delay(loops_per_jiffy);
462 if (jiffies != ticks) /* longer than 1 tick */
463 loops_per_jiffy &= ~loopbit;
466 #endif /* CONFIG_PM */