/* * 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/mach-au1x00/au1000.h> #ifdef CONFIG_PM /* * 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_usb[2]; static unsigned int sleep_sys_clocks[5]; static unsigned int sleep_sys_pinfunc; static unsigned int sleep_static_memctlr[4][3]; static void save_core_regs(void) { #ifndef CONFIG_SOC_AU1200 /* Shutdown USB host/device. */ sleep_usb[0] = 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_usb[1] = au_readl(USBD_ENABLE); au_writel(0, USBD_ENABLE); au_sync(); #else /* AU1200 */ /* enable access to OTG mmio so we can save OTG CAP/MUX. * FIXME: write an OTG driver and move this stuff there! */ au_writel(au_readl(USB_MSR_BASE + 4) | (1 << 6), USB_MSR_BASE + 4); au_sync(); sleep_usb[0] = au_readl(0xb4020020); /* OTG_CAP */ sleep_usb[1] = au_readl(0xb4020024); /* OTG_MUX */ #endif /* Clocks and PLLs. */ sleep_sys_clocks[0] = au_readl(SYS_FREQCTRL0); sleep_sys_clocks[1] = au_readl(SYS_FREQCTRL1); sleep_sys_clocks[2] = au_readl(SYS_CLKSRC); sleep_sys_clocks[3] = au_readl(SYS_CPUPLL); sleep_sys_clocks[4] = au_readl(SYS_AUXPLL); /* pin mux config */ sleep_sys_pinfunc = 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) { /* restore clock configuration. Writing CPUPLL last will * stall a bit and stabilize other clocks (unless this is * one of those Au1000 with a write-only PLL, where we dont * have a valid value) */ au_writel(sleep_sys_clocks[0], SYS_FREQCTRL0); au_writel(sleep_sys_clocks[1], SYS_FREQCTRL1); au_writel(sleep_sys_clocks[2], SYS_CLKSRC); au_writel(sleep_sys_clocks[4], SYS_AUXPLL); if (!au1xxx_cpu_has_pll_wo()) au_writel(sleep_sys_clocks[3], SYS_CPUPLL); au_sync(); au_writel(sleep_sys_pinfunc, SYS_PINFUNC); au_sync(); #ifndef CONFIG_SOC_AU1200 au_writel(sleep_usb[0], USB_HOST_CONFIG); au_writel(sleep_usb[1], USBD_ENABLE); au_sync(); #else /* enable access to OTG memory */ au_writel(au_readl(USB_MSR_BASE + 4) | (1 << 6), USB_MSR_BASE + 4); au_sync(); /* restore OTG caps and port mux. */ au_writel(sleep_usb[0], 0xb4020020 + 0); /* OTG_CAP */ au_sync(); au_writel(sleep_usb[1], 0xb4020020 + 4); /* OTG_MUX */ au_sync(); #endif /* 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); } void au_sleep(void) { int cpuid = alchemy_get_cputype(); if (cpuid != ALCHEMY_CPU_UNKNOWN) { save_core_regs(); if (cpuid <= ALCHEMY_CPU_AU1500) alchemy_sleep_au1000(); else if (cpuid <= ALCHEMY_CPU_AU1200) alchemy_sleep_au1550(); restore_core_regs(); } } #endif /* CONFIG_PM */