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         /* enable access to OTG mmio so we can save OTG CAP/MUX.
  98          * FIXME: write an OTG driver and move this stuff there!
  99          */
 100         au_writel(au_readl(USB_MSR_BASE + 4) | (1 << 6), USB_MSR_BASE + 4);
 101         au_sync();
 102         sleep_usb[0] = au_readl(0xb4020020);    /* OTG_CAP */
 103         sleep_usb[1] = au_readl(0xb4020024);    /* OTG_MUX */
 104 #endif
 105
 106         /* Clocks and PLLs. */
 107         sleep_sys_clocks[0] = au_readl(SYS_FREQCTRL0);
 108         sleep_sys_clocks[1] = au_readl(SYS_FREQCTRL1);
 109         sleep_sys_clocks[2] = au_readl(SYS_CLKSRC);
 110         sleep_sys_clocks[3] = au_readl(SYS_CPUPLL);
 111         sleep_sys_clocks[4] = au_readl(SYS_AUXPLL);
 112
 113         /* pin mux config */
 114         sleep_sys_pinfunc = au_readl(SYS_PINFUNC);
 115
 116         /* Save the static memory controller configuration. */
 117         sleep_static_memctlr[0][0] = au_readl(MEM_STCFG0);
 118         sleep_static_memctlr[0][1] = au_readl(MEM_STTIME0);
 119         sleep_static_memctlr[0][2] = au_readl(MEM_STADDR0);
 120         sleep_static_memctlr[1][0] = au_readl(MEM_STCFG1);
 121         sleep_static_memctlr[1][1] = au_readl(MEM_STTIME1);
 122         sleep_static_memctlr[1][2] = au_readl(MEM_STADDR1);
 123         sleep_static_memctlr[2][0] = au_readl(MEM_STCFG2);
 124         sleep_static_memctlr[2][1] = au_readl(MEM_STTIME2);
 125         sleep_static_memctlr[2][2] = au_readl(MEM_STADDR2);
 126         sleep_static_memctlr[3][0] = au_readl(MEM_STCFG3);
 127         sleep_static_memctlr[3][1] = au_readl(MEM_STTIME3);
 128         sleep_static_memctlr[3][2] = au_readl(MEM_STADDR3);
 129 }
 130
 131 static void restore_core_regs(void)
 132 {
 133         /* restore clock configuration.  Writing CPUPLL last will
 134          * stall a bit and stabilize other clocks (unless this is
 135          * one of those Au1000 with a write-only PLL, where we dont
 136          * have a valid value)
 137          */
 138         au_writel(sleep_sys_clocks[0], SYS_FREQCTRL0);
 139         au_writel(sleep_sys_clocks[1], SYS_FREQCTRL1);
 140         au_writel(sleep_sys_clocks[2], SYS_CLKSRC);
 141         au_writel(sleep_sys_clocks[4], SYS_AUXPLL);
 142         if (!au1xxx_cpu_has_pll_wo())
 143                 au_writel(sleep_sys_clocks[3], SYS_CPUPLL);
 144         au_sync();
 145
 146         au_writel(sleep_sys_pinfunc, SYS_PINFUNC);
 147         au_sync();
 148
 149 #ifndef CONFIG_SOC_AU1200
 150         au_writel(sleep_usb[0], USB_HOST_CONFIG);
 151         au_writel(sleep_usb[1], USBD_ENABLE);
 152         au_sync();
 153 #else
 154         /* enable accces to OTG memory */
 155         au_writel(au_readl(USB_MSR_BASE + 4) | (1 << 6), USB_MSR_BASE + 4);
 156         au_sync();
 157
 158         /* restore OTG caps and port mux. */
 159         au_writel(sleep_usb[0], 0xb4020020 + 0);        /* OTG_CAP */
 160         au_sync();
 161         au_writel(sleep_usb[1], 0xb4020020 + 4);        /* OTG_MUX */
 162         au_sync();
 163 #endif
 164
 165         /* Restore the static memory controller configuration. */
 166         au_writel(sleep_static_memctlr[0][0], MEM_STCFG0);
 167         au_writel(sleep_static_memctlr[0][1], MEM_STTIME0);
 168         au_writel(sleep_static_memctlr[0][2], MEM_STADDR0);
 169         au_writel(sleep_static_memctlr[1][0], MEM_STCFG1);
 170         au_writel(sleep_static_memctlr[1][1], MEM_STTIME1);
 171         au_writel(sleep_static_memctlr[1][2], MEM_STADDR1);
 172         au_writel(sleep_static_memctlr[2][0], MEM_STCFG2);
 173         au_writel(sleep_static_memctlr[2][1], MEM_STTIME2);
 174         au_writel(sleep_static_memctlr[2][2], MEM_STADDR2);
 175         au_writel(sleep_static_memctlr[3][0], MEM_STCFG3);
 176         au_writel(sleep_static_memctlr[3][1], MEM_STTIME3);
 177         au_writel(sleep_static_memctlr[3][2], MEM_STADDR3);
 178
 179         /*
 180          * Enable the UART if it was enabled before sleep.
 181          * I guess I should define module control bits........
 182          */
 183         if (sleep_uart0_enable & 0x02) {
 184                 au_writel(0, UART0_ADDR + UART_MOD_CNTRL); au_sync();
 185                 au_writel(1, UART0_ADDR + UART_MOD_CNTRL); au_sync();
 186                 au_writel(3, UART0_ADDR + UART_MOD_CNTRL); au_sync();
 187                 au_writel(sleep_uart0_inten, UART0_ADDR + UART_IER); au_sync();
 188                 au_writel(sleep_uart0_fifoctl, UART0_ADDR + UART_FCR); au_sync();
 189                 au_writel(sleep_uart0_linectl, UART0_ADDR + UART_LCR); au_sync();
 190                 au_writel(sleep_uart0_clkdiv, UART0_ADDR + UART_CLK); au_sync();
 191         }
 192 }
 193
 194 void au_sleep(void)
 195 {
 196         save_core_regs();
 197         au1xxx_save_and_sleep();
 198         restore_core_regs();
 199 }
 200
 201 #endif  /* CONFIG_PM */