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-rw-r--r--arch/mips/alchemy/common/power.c465
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diff --git a/arch/mips/alchemy/common/power.c b/arch/mips/alchemy/common/power.c
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+/*
+ * BRIEF MODULE DESCRIPTION
+ * Au1xx0 Power Management routines.
+ *
+ * Copyright 2001, 2008 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc. <source@mvista.com>
+ *
+ * Some of the routines are right out of init/main.c, whose
+ * copyrights apply here.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/pm.h>
+#include <linux/sysctl.h>
+#include <linux/jiffies.h>
+
+#include <asm/uaccess.h>
+#include <asm/cacheflush.h>
+#include <asm/mach-au1x00/au1000.h>
+
+#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
+
+static void au1000_calibrate_delay(void);
+
+extern unsigned long save_local_and_disable(int controller);
+extern void restore_local_and_enable(int controller, unsigned long mask);
+extern void local_enable_irq(unsigned int irq_nr);
+
+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.
+ * If reading a register doesn't provide a proper result for a
+ * later restore, we have to provide a function for loading that
+ * register and save a copy.
+ *
+ * We only have to save/restore registers that aren't otherwise
+ * done as part of a driver pm_* function.
+ */
+static unsigned int sleep_aux_pll_cntrl;
+static unsigned int sleep_cpu_pll_cntrl;
+static unsigned int sleep_pin_function;
+static unsigned int sleep_uart0_inten;
+static unsigned int sleep_uart0_fifoctl;
+static unsigned int sleep_uart0_linectl;
+static unsigned int sleep_uart0_clkdiv;
+static unsigned int sleep_uart0_enable;
+static unsigned int sleep_usbhost_enable;
+static unsigned int sleep_usbdev_enable;
+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;
+void wakeup_counter0_set(int ticks);
+#endif
+
+static void save_core_regs(void)
+{
+ extern void save_au1xxx_intctl(void);
+ extern void pm_eth0_shutdown(void);
+
+ /*
+ * Do the serial ports.....these really should be a pm_*
+ * registered function by the driver......but of course the
+ * standard serial driver doesn't understand our Au1xxx
+ * unique registers.
+ */
+ sleep_uart0_inten = au_readl(UART0_ADDR + UART_IER);
+ sleep_uart0_fifoctl = au_readl(UART0_ADDR + UART_FCR);
+ sleep_uart0_linectl = au_readl(UART0_ADDR + UART_LCR);
+ sleep_uart0_clkdiv = au_readl(UART0_ADDR + UART_CLK);
+ sleep_uart0_enable = au_readl(UART0_ADDR + UART_MOD_CNTRL);
+
+ /* Shutdown USB host/device. */
+ sleep_usbhost_enable = au_readl(USB_HOST_CONFIG);
+
+ /* There appears to be some undocumented reset register.... */
+ au_writel(0, 0xb0100004); au_sync();
+ au_writel(0, USB_HOST_CONFIG); au_sync();
+
+ sleep_usbdev_enable = au_readl(USBD_ENABLE);
+ au_writel(0, USBD_ENABLE); au_sync();
+
+ /* Save interrupt controller state. */
+ save_au1xxx_intctl();
+
+ /* Clocks and PLLs. */
+ sleep_aux_pll_cntrl = au_readl(SYS_AUXPLL);
+
+ /*
+ * We don't really need to do this one, but unless we
+ * write it again it won't have a valid value if we
+ * happen to read it.
+ */
+ sleep_cpu_pll_cntrl = au_readl(SYS_CPUPLL);
+
+ sleep_pin_function = au_readl(SYS_PINFUNC);
+
+ /* Save the static memory controller configuration. */
+ sleep_static_memctlr[0][0] = au_readl(MEM_STCFG0);
+ sleep_static_memctlr[0][1] = au_readl(MEM_STTIME0);
+ sleep_static_memctlr[0][2] = au_readl(MEM_STADDR0);
+ sleep_static_memctlr[1][0] = au_readl(MEM_STCFG1);
+ sleep_static_memctlr[1][1] = au_readl(MEM_STTIME1);
+ sleep_static_memctlr[1][2] = au_readl(MEM_STADDR1);
+ sleep_static_memctlr[2][0] = au_readl(MEM_STCFG2);
+ sleep_static_memctlr[2][1] = au_readl(MEM_STTIME2);
+ sleep_static_memctlr[2][2] = au_readl(MEM_STADDR2);
+ sleep_static_memctlr[3][0] = au_readl(MEM_STCFG3);
+ sleep_static_memctlr[3][1] = au_readl(MEM_STTIME3);
+ sleep_static_memctlr[3][2] = au_readl(MEM_STADDR3);
+}
+
+static void restore_core_regs(void)
+{
+ extern void restore_au1xxx_intctl(void);
+ extern void wakeup_counter0_adjust(void);
+
+ au_writel(sleep_aux_pll_cntrl, SYS_AUXPLL); au_sync();
+ au_writel(sleep_cpu_pll_cntrl, SYS_CPUPLL); au_sync();
+ au_writel(sleep_pin_function, SYS_PINFUNC); au_sync();
+
+ /* Restore the static memory controller configuration. */
+ au_writel(sleep_static_memctlr[0][0], MEM_STCFG0);
+ au_writel(sleep_static_memctlr[0][1], MEM_STTIME0);
+ au_writel(sleep_static_memctlr[0][2], MEM_STADDR0);
+ au_writel(sleep_static_memctlr[1][0], MEM_STCFG1);
+ au_writel(sleep_static_memctlr[1][1], MEM_STTIME1);
+ au_writel(sleep_static_memctlr[1][2], MEM_STADDR1);
+ au_writel(sleep_static_memctlr[2][0], MEM_STCFG2);
+ au_writel(sleep_static_memctlr[2][1], MEM_STTIME2);
+ au_writel(sleep_static_memctlr[2][2], MEM_STADDR2);
+ au_writel(sleep_static_memctlr[3][0], MEM_STCFG3);
+ au_writel(sleep_static_memctlr[3][1], MEM_STTIME3);
+ au_writel(sleep_static_memctlr[3][2], MEM_STADDR3);
+
+ /*
+ * Enable the UART if it was enabled before sleep.
+ * I guess I should define module control bits........
+ */
+ if (sleep_uart0_enable & 0x02) {
+ au_writel(0, UART0_ADDR + UART_MOD_CNTRL); au_sync();
+ au_writel(1, UART0_ADDR + UART_MOD_CNTRL); au_sync();
+ au_writel(3, UART0_ADDR + UART_MOD_CNTRL); au_sync();
+ au_writel(sleep_uart0_inten, UART0_ADDR + UART_IER); au_sync();
+ au_writel(sleep_uart0_fifoctl, UART0_ADDR + UART_FCR); au_sync();
+ au_writel(sleep_uart0_linectl, UART0_ADDR + UART_LCR); au_sync();
+ au_writel(sleep_uart0_clkdiv, UART0_ADDR + UART_CLK); au_sync();
+ }
+
+ restore_au1xxx_intctl();
+ wakeup_counter0_adjust();
+}
+
+unsigned long suspend_mode;
+
+void wakeup_from_suspend(void)
+{
+ suspend_mode = 0;
+}
+
+int au_sleep(void)
+{
+ unsigned long wakeup, flags;
+ extern void save_and_sleep(void);
+
+ spin_lock_irqsave(&pm_lock, flags);
+
+ save_core_regs();
+
+ flush_cache_all();
+
+ /**
+ ** 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. */
+#ifdef SLEEP_TEST_TIMEOUT
+ wakeup_counter0_set(sleep_ticks);
+#endif
+ 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();
+
+ save_and_sleep();
+
+ /*
+ * After a wakeup, the cpu vectors back to 0x1fc00000, so
+ * it's up to the boot code to get us back here.
+ */
+ restore_core_regs();
+ spin_unlock_irqrestore(&pm_lock, flags);
+ return 0;
+}
+
+static int pm_do_sleep(ctl_table *ctl, int write, struct file *file,
+ void __user *buffer, size_t *len, loff_t *ppos)
+{
+#ifdef SLEEP_TEST_TIMEOUT
+#define TMPBUFLEN2 16
+ char buf[TMPBUFLEN2], *p;
+#endif
+
+ if (!write)
+ *len = 0;
+ else {
+#ifdef SLEEP_TEST_TIMEOUT
+ if (*len > TMPBUFLEN2 - 1)
+ return -EFAULT;
+ if (copy_from_user(buf, buffer, *len))
+ return -EFAULT;
+ buf[*len] = 0;
+ p = buf;
+ sleep_ticks = simple_strtoul(p, &p, 0);
+#endif
+
+ au_sleep();
+ }
+ return 0;
+}
+
+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);
+ local_enable_irq(AU1000_TOY_MATCH2_INT);
+ 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;
+}
+
+
+static struct ctl_table pm_table[] = {
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "sleep",
+ .data = NULL,
+ .maxlen = 0,
+ .mode = 0600,
+ .proc_handler = &pm_do_sleep
+ },
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "freq",
+ .data = NULL,
+ .maxlen = 0,
+ .mode = 0600,
+ .proc_handler = &pm_do_freq
+ },
+ {}
+};
+
+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)
+{
+ register_sysctl_table(pm_dir_table);
+ return 0;
+}
+
+__initcall(pm_init);
+
+/*
+ * 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;
+ }
+}
+#endif /* CONFIG_PM */
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