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MIPS: Alchemy: new userspace suspend interface for development boards.
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Replace the current sysctl-based suspend interface with a new sysfs-
based one which also uses the Linux-2.6 suspend model.

To configure wakeup sources, a subtree for the demoboards is created
under /sys/power/db1x:

sys/
`-- power
    `-- db1x
        |-- gpio0
        |-- gpio1
        |-- gpio2
        |-- gpio3
        |-- gpio4
        |-- gpio5
        |-- gpio6
        |-- gpio7
        |-- timer
        |-- timer_timeout
        |-- wakemsk
        `-- wakesrc

The nodes 'gpio[0-7]' and 'timer' configure the GPIO0..7 and M2
bits of the SYS_WAKEMSK (wakeup source enable) register.  Writing '1'
enables a wakesource, 0 disables it.

The 'timer_timeout' node holds the timeout in seconds after which the
TOYMATCH2 event should wake the system.

The 'wakesrc' node holds the SYS_WAKESRC register after wakeup (in hex),
the 'wakemsk' node can be used to get/set the wakeup mask directly.

For example, to have the timer wake the system after 10 seconds of sleep,
the following must be done in userspace:

echo 10 > /sys/power/db1x/timer_timeout
echo 1 > /sys/power/db1x/timer
echo mem > /sys/power/sleep

This patch also removes the homebrew CPU frequency switching code.  I don't
understand how it could have ever worked reliably; it does not communicate
the clock changes to peripheral devices other than uarts.

Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

 create mode 100644 arch/mips/alchemy/devboards/pm.c
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Manuel Lauss authored and Ralf Baechle committed Jan 11, 2009
1 parent ac15dad commit 61f9c58
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Showing 5 changed files with 234 additions and 353 deletions.
44 changes: 0 additions & 44 deletions arch/mips/alchemy/common/irq.c
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Original file line number Diff line number Diff line change
Expand Up @@ -37,8 +37,6 @@
#include <asm/mach-pb1x00/pb1000.h>
#endif

static DEFINE_SPINLOCK(irq_lock);

static int au1x_ic_settype(unsigned int irq, unsigned int flow_type);

/* per-processor fixed function irqs */
Expand Down Expand Up @@ -611,45 +609,3 @@ void __init arch_init_irq(void)

set_c0_status(IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3);
}

unsigned long save_local_and_disable(int controller)
{
int i;
unsigned long flags, mask;

spin_lock_irqsave(&irq_lock, flags);
if (controller) {
mask = au_readl(IC1_MASKSET);
for (i = 0; i < 32; i++)
au1x_ic1_mask(i + AU1000_INTC1_INT_BASE);
} else {
mask = au_readl(IC0_MASKSET);
for (i = 0; i < 32; i++)
au1x_ic0_mask(i + AU1000_INTC0_INT_BASE);
}
spin_unlock_irqrestore(&irq_lock, flags);

return mask;
}

void restore_local_and_enable(int controller, unsigned long mask)
{
int i;
unsigned long flags, new_mask;

spin_lock_irqsave(&irq_lock, flags);
for (i = 0; i < 32; i++)
if (mask & (1 << i)) {
if (controller)
au1x_ic1_unmask(i + AU1000_INTC1_INT_BASE);
else
au1x_ic0_unmask(i + AU1000_INTC0_INT_BASE);
}

if (controller)
new_mask = au_readl(IC1_MASKSET);
else
new_mask = au_readl(IC0_MASKSET);

spin_unlock_irqrestore(&irq_lock, flags);
}
309 changes: 0 additions & 309 deletions arch/mips/alchemy/common/power.c
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Original file line number Diff line number Diff line change
Expand Up @@ -42,18 +42,6 @@

#ifdef CONFIG_PM

#define DEBUG 1
#ifdef DEBUG
#define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __func__, ## args)
#else
#define DPRINTK(fmt, args...)
#endif

extern unsigned long save_local_and_disable(int controller);
extern void restore_local_and_enable(int controller, unsigned long mask);

static DEFINE_SPINLOCK(pm_lock);

/*
* We need to save/restore a bunch of core registers that are
* either volatile or reset to some state across a processor sleep.
Expand All @@ -74,21 +62,6 @@ static unsigned int sleep_sys_clocks[5];
static unsigned int sleep_sys_pinfunc;
static unsigned int sleep_static_memctlr[4][3];

/*
* Define this to cause the value you write to /proc/sys/pm/sleep to
* set the TOY timer for the amount of time you want to sleep.
* This is done mainly for testing, but may be useful in other cases.
* The value is number of 32KHz ticks to sleep.
*/
#define SLEEP_TEST_TIMEOUT 1
#ifdef SLEEP_TEST_TIMEOUT
static int sleep_ticks;
static void wakeup_counter0_set(int ticks)
{
au_writel(au_readl(SYS_TOYREAD) + ticks, SYS_TOYMATCH2);
au_sync();
}
#endif

static void save_core_regs(void)
{
Expand Down Expand Up @@ -234,293 +207,11 @@ static void restore_core_regs(void)
#endif
}

unsigned long suspend_mode;

void wakeup_from_suspend(void)
{
suspend_mode = 0;
}

void au_sleep(void)
{
save_core_regs();
au1xxx_save_and_sleep();
restore_core_regs();
}

static int pm_do_sleep(ctl_table *ctl, int write, struct file *file,
void __user *buffer, size_t *len, loff_t *ppos)
{
unsigned long wakeup, flags;
int ret;
#ifdef SLEEP_TEST_TIMEOUT
#define TMPBUFLEN2 16
char buf[TMPBUFLEN2], *p;
#endif

spin_lock_irqsave(&pm_lock, flags);

if (!write) {
*len = 0;
ret = 0;
goto out_unlock;
};

#ifdef SLEEP_TEST_TIMEOUT
if (*len > TMPBUFLEN2 - 1) {
ret = -EFAULT;
goto out_unlock;
}
if (copy_from_user(buf, buffer, *len)) {
return -EFAULT;
goto out_unlock;
}
buf[*len] = 0;
p = buf;
sleep_ticks = simple_strtoul(p, &p, 0);
wakeup_counter0_set(sleep_ticks);
#endif

/**
** The code below is all system dependent and we should probably
** have a function call out of here to set this up. You need
** to configure the GPIO or timer interrupts that will bring
** you out of sleep.
** For testing, the TOY counter wakeup is useful.
**/
#if 0
au_writel(au_readl(SYS_PINSTATERD) & ~(1 << 11), SYS_PINSTATERD);

/* GPIO 6 can cause a wake up event */
wakeup = au_readl(SYS_WAKEMSK);
wakeup &= ~(1 << 8); /* turn off match20 wakeup */
wakeup |= 1 << 6; /* turn on GPIO 6 wakeup */
#else
/* For testing, allow match20 to wake us up. */
wakeup = 1 << 8; /* turn on match20 wakeup */
wakeup = 0;
#endif
au_writel(1, SYS_WAKESRC); /* clear cause */
au_sync();
au_writel(wakeup, SYS_WAKEMSK);
au_sync();

au_sleep();
ret = 0;

out_unlock:
spin_unlock_irqrestore(&pm_lock, flags);
return ret;
}

#if !defined(CONFIG_SOC_AU1200) && !defined(CONFIG_SOC_AU1550)

/*
* This is right out of init/main.c
*/

/*
* This is the number of bits of precision for the loops_per_jiffy.
* Each bit takes on average 1.5/HZ seconds. This (like the original)
* is a little better than 1%.
*/
#define LPS_PREC 8

static void au1000_calibrate_delay(void)
{
unsigned long ticks, loopbit;
int lps_precision = LPS_PREC;

loops_per_jiffy = 1 << 12;

while (loops_per_jiffy <<= 1) {
/* Wait for "start of" clock tick */
ticks = jiffies;
while (ticks == jiffies)
/* nothing */ ;
/* Go ... */
ticks = jiffies;
__delay(loops_per_jiffy);
ticks = jiffies - ticks;
if (ticks)
break;
}

/*
* Do a binary approximation to get loops_per_jiffy set to be equal
* one clock (up to lps_precision bits)
*/
loops_per_jiffy >>= 1;
loopbit = loops_per_jiffy;
while (lps_precision-- && (loopbit >>= 1)) {
loops_per_jiffy |= loopbit;
ticks = jiffies;
while (ticks == jiffies);
ticks = jiffies;
__delay(loops_per_jiffy);
if (jiffies != ticks) /* longer than 1 tick */
loops_per_jiffy &= ~loopbit;
}
}

static int pm_do_freq(ctl_table *ctl, int write, struct file *file,
void __user *buffer, size_t *len, loff_t *ppos)
{
int retval = 0, i;
unsigned long val, pll;
#define TMPBUFLEN 64
#define MAX_CPU_FREQ 396
char buf[TMPBUFLEN], *p;
unsigned long flags, intc0_mask, intc1_mask;
unsigned long old_baud_base, old_cpu_freq, old_clk, old_refresh;
unsigned long new_baud_base, new_cpu_freq, new_clk, new_refresh;
unsigned long baud_rate;

spin_lock_irqsave(&pm_lock, flags);
if (!write)
*len = 0;
else {
/* Parse the new frequency */
if (*len > TMPBUFLEN - 1) {
spin_unlock_irqrestore(&pm_lock, flags);
return -EFAULT;
}
if (copy_from_user(buf, buffer, *len)) {
spin_unlock_irqrestore(&pm_lock, flags);
return -EFAULT;
}
buf[*len] = 0;
p = buf;
val = simple_strtoul(p, &p, 0);
if (val > MAX_CPU_FREQ) {
spin_unlock_irqrestore(&pm_lock, flags);
return -EFAULT;
}

pll = val / 12;
if ((pll > 33) || (pll < 7)) { /* 396 MHz max, 84 MHz min */
/* Revisit this for higher speed CPUs */
spin_unlock_irqrestore(&pm_lock, flags);
return -EFAULT;
}

old_baud_base = get_au1x00_uart_baud_base();
old_cpu_freq = get_au1x00_speed();

new_cpu_freq = pll * 12 * 1000000;
new_baud_base = (new_cpu_freq / (2 * ((int)(au_readl(SYS_POWERCTRL)
& 0x03) + 2) * 16));
set_au1x00_speed(new_cpu_freq);
set_au1x00_uart_baud_base(new_baud_base);

old_refresh = au_readl(MEM_SDREFCFG) & 0x1ffffff;
new_refresh = ((old_refresh * new_cpu_freq) / old_cpu_freq) |
(au_readl(MEM_SDREFCFG) & ~0x1ffffff);

au_writel(pll, SYS_CPUPLL);
au_sync_delay(1);
au_writel(new_refresh, MEM_SDREFCFG);
au_sync_delay(1);

for (i = 0; i < 4; i++)
if (au_readl(UART_BASE + UART_MOD_CNTRL +
i * 0x00100000) == 3) {
old_clk = au_readl(UART_BASE + UART_CLK +
i * 0x00100000);
baud_rate = old_baud_base / old_clk;
/*
* We won't get an exact baud rate and the error
* could be significant enough that our new
* calculation will result in a clock that will
* give us a baud rate that's too far off from
* what we really want.
*/
if (baud_rate > 100000)
baud_rate = 115200;
else if (baud_rate > 50000)
baud_rate = 57600;
else if (baud_rate > 30000)
baud_rate = 38400;
else if (baud_rate > 17000)
baud_rate = 19200;
else
baud_rate = 9600;
new_clk = new_baud_base / baud_rate;
au_writel(new_clk, UART_BASE + UART_CLK +
i * 0x00100000);
au_sync_delay(10);
}
}

/*
* We don't want _any_ interrupts other than match20. Otherwise our
* au1000_calibrate_delay() calculation will be off, potentially a lot.
*/
intc0_mask = save_local_and_disable(0);
intc1_mask = save_local_and_disable(1);
val = 1 << (AU1000_TOY_MATCH2_INT - AU1000_INTC0_INT_BASE);
au_writel(val, IC0_MASKSET); /* unmask */
au_writel(val, IC0_WAKESET); /* enable wake-from-sleep */
au_sync();
spin_unlock_irqrestore(&pm_lock, flags);
au1000_calibrate_delay();
restore_local_and_enable(0, intc0_mask);
restore_local_and_enable(1, intc1_mask);

return retval;
}
#endif

static struct ctl_table pm_table[] = {
{
.ctl_name = CTL_UNNUMBERED,
.procname = "sleep",
.data = NULL,
.maxlen = 0,
.mode = 0600,
.proc_handler = &pm_do_sleep
},
#if !defined(CONFIG_SOC_AU1200) && !defined(CONFIG_SOC_AU1550)
{
.ctl_name = CTL_UNNUMBERED,
.procname = "freq",
.data = NULL,
.maxlen = 0,
.mode = 0600,
.proc_handler = &pm_do_freq
},
#endif
{}
};

static struct ctl_table pm_dir_table[] = {
{
.ctl_name = CTL_UNNUMBERED,
.procname = "pm",
.mode = 0555,
.child = pm_table
},
{}
};

/*
* Initialize power interface
*/
static int __init pm_init(void)
{
/* init TOY to tick at 1Hz. No need to wait for access bits
* since there's plenty of time between here and the first
* suspend cycle.
*/
if (au_readl(SYS_TOYTRIM) != 32767) {
au_writel(32767, SYS_TOYTRIM);
au_sync();
}

register_sysctl_table(pm_dir_table);
return 0;
}

__initcall(pm_init);

#endif /* CONFIG_PM */
1 change: 1 addition & 0 deletions arch/mips/alchemy/devboards/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
#

obj-y += prom.o
obj-$(CONFIG_PM) += pm.o
obj-$(CONFIG_MIPS_PB1000) += pb1000/
obj-$(CONFIG_MIPS_PB1100) += pb1100/
obj-$(CONFIG_MIPS_PB1200) += pb1200/
Expand Down
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