release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/alchemy/common/power.c

   1 /*
   2  * BRIEF MODULE DESCRIPTION
   3  *      Au1xx0 Power Management routines.
   4  *
   5  * Copyright 2001, 2008 MontaVista Software Inc.
   6  * Author: MontaVista Software, Inc. <source@mvista.com>
   7  *
   8  *  Some of the routines are right out of init/main.c, whose
   9  *  copyrights apply here.
  10  *
  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.
  15  *
  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.
  26  *
  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.
  30  */
  31
  32 #include <linux/init.h>
  33 #include <linux/pm.h>
  34 #include <linux/sysctl.h>
  35 #include <linux/jiffies.h>
  36
  37 #include <asm/uaccess.h>
  38 #include <asm/mach-au1x00/au1000.h>
  39
  40 #ifdef CONFIG_PM
  41
  42 /*
  43  * We need to save/restore a bunch of core registers that are
  44  * either volatile or reset to some state across a processor sleep.
  45  * If reading a register doesn't provide a proper result for a
  46  * later restore, we have to provide a function for loading that
  47  * register and save a copy.
  48  *
  49  * We only have to save/restore registers that aren't otherwise
  50  * done as part of a driver pm_* function.
  51  */
  52 static unsigned int sleep_uart0_inten;
  53 static unsigned int sleep_uart0_fifoctl;
  54 static unsigned int sleep_uart0_linectl;
  55 static unsigned int sleep_uart0_clkdiv;
  56 static unsigned int sleep_uart0_enable;
  57 static unsigned int sleep_usb[2];
  58 static unsigned int sleep_sys_clocks[5];
  59 static unsigned int sleep_sys_pinfunc;
  60 static unsigned int sleep_static_memctlr[4][3];
  61
  62
  63 static void save_core_regs(void)
  64 {
  65         extern void save_au1xxx_intctl(void);
  66         extern void pm_eth0_shutdown(void);
  67
  68         /*
  69          * Do the serial ports.....these really should be a pm_*
  70          * registered function by the driver......but of course the
  71          * standard serial driver doesn't understand our Au1xxx
  72          * unique registers.
  73          */
  74         sleep_uart0_inten = au_readl(UART0_ADDR + UART_IER);
  75         sleep_uart0_fifoctl = au_readl(UART0_ADDR + UART_FCR);
  76         sleep_uart0_linectl = au_readl(UART0_ADDR + UART_LCR);
  77         sleep_uart0_clkdiv = au_readl(UART0_ADDR + UART_CLK);
  78         sleep_uart0_enable = au_readl(UART0_ADDR + UART_MOD_CNTRL);
  79         au_sync();
  80
  81 #ifndef CONFIG_SOC_AU1200
  82         /* Shutdown USB host/device. */
  83         sleep_usb[0] = au_readl(USB_HOST_CONFIG);
  84
  85         /* There appears to be some undocumented reset register.... */
  86         au_writel(0, 0xb0100004);
  87         au_sync();
  88         au_writel(0, USB_HOST_CONFIG);
  89         au_sync();
  90
  91         sleep_usb[1] = au_readl(USBD_ENABLE);
  92         au_writel(0, USBD_ENABLE);
  93         au_sync();
  94
  95 #else   /* AU1200 */
  96
  97         au_writel(au_readl(USB_MSR_BASE + 4) | (1 << 6), USB_MSR_BASE + 4);
  98         au_sync();
  99         sleep_usb[0] = au_readl(0xb4020020);    /* OTG_CAP */
 100         sleep_usb[1] = au_readl(0xb4020024);    /* OTG_MUX */
 101 #endif
 102
 103         /* Clocks and PLLs. */
 104         sleep_sys_clocks[0] = au_readl(SYS_FREQCTRL0);
 105         sleep_sys_clocks[1] = au_readl(SYS_FREQCTRL1);
 106         sleep_sys_clocks[2] = au_readl(SYS_CLKSRC);
 107         sleep_sys_clocks[3] = au_readl(SYS_CPUPLL);
 108         sleep_sys_clocks[4] = au_readl(SYS_AUXPLL);
 109
 110         /* pin mux config */
 111         sleep_sys_pinfunc = au_readl(SYS_PINFUNC);
 112
 113         /* Save the static memory controller configuration. */
 114         sleep_static_memctlr[0][0] = au_readl(MEM_STCFG0);
 115         sleep_static_memctlr[0][1] = au_readl(MEM_STTIME0);
 116         sleep_static_memctlr[0][2] = au_readl(MEM_STADDR0);
 117         sleep_static_memctlr[1][0] = au_readl(MEM_STCFG1);
 118         sleep_static_memctlr[1][1] = au_readl(MEM_STTIME1);
 119         sleep_static_memctlr[1][2] = au_readl(MEM_STADDR1);
 120         sleep_static_memctlr[2][0] = au_readl(MEM_STCFG2);
 121         sleep_static_memctlr[2][1] = au_readl(MEM_STTIME2);
 122         sleep_static_memctlr[2][2] = au_readl(MEM_STADDR2);
 123         sleep_static_memctlr[3][0] = au_readl(MEM_STCFG3);
 124         sleep_static_memctlr[3][1] = au_readl(MEM_STTIME3);
 125         sleep_static_memctlr[3][2] = au_readl(MEM_STADDR3);
 126 }
 127
 128 static void restore_core_regs(void)
 129 {
 130         /* restore clock configuration.  Writing CPUPLL last will
 131          * stall a bit and stabilize other clocks (unless this is
 132          * one of those Au1000 with a write-only PLL, where we dont
 133          * have a valid value)
 134          */
 135         au_writel(sleep_sys_clocks[0], SYS_FREQCTRL0);
 136         au_writel(sleep_sys_clocks[1], SYS_FREQCTRL1);
 137         au_writel(sleep_sys_clocks[2], SYS_CLKSRC);
 138         au_writel(sleep_sys_clocks[4], SYS_AUXPLL);
 139         if (!au1xxx_cpu_has_pll_wo())
 140                 au_writel(sleep_sys_clocks[3], SYS_CPUPLL);
 141         au_sync();
 142
 143         au_writel(sleep_sys_pinfunc, SYS_PINFUNC);
 144         au_sync();
 145
 146 #ifndef CONFIG_SOC_AU1200
 147         au_writel(sleep_usb[0], USB_HOST_CONFIG);
 148         au_writel(sleep_usb[1], USBD_ENABLE);
 149         au_sync();
 150 #else
 151         /* enable accces to OTG memory */
 152         au_writel(au_readl(USB_MSR_BASE + 4) | (1 << 6), USB_MSR_BASE + 4);
 153         au_sync();
 154
 155         /* restore OTG caps and port mux. */
 156         au_writel(sleep_usb[0], 0xb4020020 + 0);        /* OTG_CAP */
 157         au_sync();
 158         au_writel(sleep_usb[1], 0xb4020020 + 4);        /* OTG_MUX */
 159         au_sync();
 160 #endif
 161
 162         /* Restore the static memory controller configuration. */
 163         au_writel(sleep_static_memctlr[0][0], MEM_STCFG0);
 164         au_writel(sleep_static_memctlr[0][1], MEM_STTIME0);
 165         au_writel(sleep_static_memctlr[0][2], MEM_STADDR0);
 166         au_writel(sleep_static_memctlr[1][0], MEM_STCFG1);
 167         au_writel(sleep_static_memctlr[1][1], MEM_STTIME1);
 168         au_writel(sleep_static_memctlr[1][2], MEM_STADDR1);
 169         au_writel(sleep_static_memctlr[2][0], MEM_STCFG2);
 170         au_writel(sleep_static_memctlr[2][1], MEM_STTIME2);
 171         au_writel(sleep_static_memctlr[2][2], MEM_STADDR2);
 172         au_writel(sleep_static_memctlr[3][0], MEM_STCFG3);
 173         au_writel(sleep_static_memctlr[3][1], MEM_STTIME3);
 174         au_writel(sleep_static_memctlr[3][2], MEM_STADDR3);
 175
 176         /*
 177          * Enable the UART if it was enabled before sleep.
 178          * I guess I should define module control bits........
 179          */
 180         if (sleep_uart0_enable & 0x02) {
 181                 au_writel(0, UART0_ADDR + UART_MOD_CNTRL); au_sync();
 182                 au_writel(1, UART0_ADDR + UART_MOD_CNTRL); au_sync();
 183                 au_writel(3, UART0_ADDR + UART_MOD_CNTRL); au_sync();
 184                 au_writel(sleep_uart0_inten, UART0_ADDR + UART_IER); au_sync();
 185                 au_writel(sleep_uart0_fifoctl, UART0_ADDR + UART_FCR); au_sync();
 186                 au_writel(sleep_uart0_linectl, UART0_ADDR + UART_LCR); au_sync();
 187                 au_writel(sleep_uart0_clkdiv, UART0_ADDR + UART_CLK); au_sync();
 188         }
 189 }
 190
 191 void au_sleep(void)
 192 {
 193         int cpuid = alchemy_get_cputype();
 194         if (cpuid != ALCHEMY_CPU_UNKNOWN) {
 195                 save_core_regs();
 196                 if (cpuid <= ALCHEMY_CPU_AU1500)
 197                         alchemy_sleep_au1000();
 198                 else if (cpuid <= ALCHEMY_CPU_AU1200)
 199                         alchemy_sleep_au1550();
 200                 restore_core_regs();
 201         }
 202 }
 203
 204 #endif  /* CONFIG_PM */