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Diffstat (limited to 'arch/mips/alchemy/common/power.c')
| -rw-r--r-- | arch/mips/alchemy/common/power.c | 465 |
1 files changed, 465 insertions, 0 deletions
diff --git a/arch/mips/alchemy/common/power.c b/arch/mips/alchemy/common/power.c new file mode 100644 index 00000000000..bd854a6d1d8 --- /dev/null +++ b/arch/mips/alchemy/common/power.c @@ -0,0 +1,465 @@ +/* + * 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 */ |