/*
* 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/pm.h>
#include <linux/sysctl.h>
#include <linux/jiffies.h>
#include <linux/uaccess.h>
#include <asm /mach-au1x00/au1000.h>
/*
* 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_sys_clocks[5 ];
static unsigned int sleep_sys_pinfunc;
static unsigned int sleep_static_memctlr[4 ][3 ];
static void save_core_regs(void )
{
/* Clocks and PLLs. */
sleep_sys_clocks[0 ] = alchemy_rdsys(AU1000_SYS_FREQCTRL0);
sleep_sys_clocks[1 ] = alchemy_rdsys(AU1000_SYS_FREQCTRL1);
sleep_sys_clocks[2 ] = alchemy_rdsys(AU1000_SYS_CLKSRC);
sleep_sys_clocks[3 ] = alchemy_rdsys(AU1000_SYS_CPUPLL);
sleep_sys_clocks[4 ] = alchemy_rdsys(AU1000_SYS_AUXPLL);
/* pin mux config */
sleep_sys_pinfunc = alchemy_rdsys(AU1000_SYS_PINFUNC);
/* Save the static memory controller configuration. */
sleep_static_memctlr[0 ][0 ] = alchemy_rdsmem(AU1000_MEM_STCFG0);
sleep_static_memctlr[0 ][1 ] = alchemy_rdsmem(AU1000_MEM_STTIME0);
sleep_static_memctlr[0 ][2 ] = alchemy_rdsmem(AU1000_MEM_STADDR0);
sleep_static_memctlr[1 ][0 ] = alchemy_rdsmem(AU1000_MEM_STCFG1);
sleep_static_memctlr[1 ][1 ] = alchemy_rdsmem(AU1000_MEM_STTIME1);
sleep_static_memctlr[1 ][2 ] = alchemy_rdsmem(AU1000_MEM_STADDR1);
sleep_static_memctlr[2 ][0 ] = alchemy_rdsmem(AU1000_MEM_STCFG2);
sleep_static_memctlr[2 ][1 ] = alchemy_rdsmem(AU1000_MEM_STTIME2);
sleep_static_memctlr[2 ][2 ] = alchemy_rdsmem(AU1000_MEM_STADDR2);
sleep_static_memctlr[3 ][0 ] = alchemy_rdsmem(AU1000_MEM_STCFG3);
sleep_static_memctlr[3 ][1 ] = alchemy_rdsmem(AU1000_MEM_STTIME3);
sleep_static_memctlr[3 ][2 ] = alchemy_rdsmem(AU1000_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 )
*/
alchemy_wrsys(sleep_sys_clocks[0 ], AU1000_SYS_FREQCTRL0);
alchemy_wrsys(sleep_sys_clocks[1 ], AU1000_SYS_FREQCTRL1);
alchemy_wrsys(sleep_sys_clocks[2 ], AU1000_SYS_CLKSRC);
alchemy_wrsys(sleep_sys_clocks[4 ], AU1000_SYS_AUXPLL);
if (!au1xxx_cpu_has_pll_wo())
alchemy_wrsys(sleep_sys_clocks[3 ], AU1000_SYS_CPUPLL);
alchemy_wrsys(sleep_sys_pinfunc, AU1000_SYS_PINFUNC);
/* Restore the static memory controller configuration. */
alchemy_wrsmem(sleep_static_memctlr[0 ][0 ], AU1000_MEM_STCFG0);
alchemy_wrsmem(sleep_static_memctlr[0 ][1 ], AU1000_MEM_STTIME0);
alchemy_wrsmem(sleep_static_memctlr[0 ][2 ], AU1000_MEM_STADDR0);
alchemy_wrsmem(sleep_static_memctlr[1 ][0 ], AU1000_MEM_STCFG1);
alchemy_wrsmem(sleep_static_memctlr[1 ][1 ], AU1000_MEM_STTIME1);
alchemy_wrsmem(sleep_static_memctlr[1 ][2 ], AU1000_MEM_STADDR1);
alchemy_wrsmem(sleep_static_memctlr[2 ][0 ], AU1000_MEM_STCFG2);
alchemy_wrsmem(sleep_static_memctlr[2 ][1 ], AU1000_MEM_STTIME2);
alchemy_wrsmem(sleep_static_memctlr[2 ][2 ], AU1000_MEM_STADDR2);
alchemy_wrsmem(sleep_static_memctlr[3 ][0 ], AU1000_MEM_STCFG3);
alchemy_wrsmem(sleep_static_memctlr[3 ][1 ], AU1000_MEM_STTIME3);
alchemy_wrsmem(sleep_static_memctlr[3 ][2 ], AU1000_MEM_STADDR3);
}
void au_sleep(void )
{
save_core_regs();
switch (alchemy_get_cputype()) {
case ALCHEMY_CPU_AU1000:
case ALCHEMY_CPU_AU1500:
case ALCHEMY_CPU_AU1100:
alchemy_sleep_au1000();
break ;
case ALCHEMY_CPU_AU1550:
case ALCHEMY_CPU_AU1200:
alchemy_sleep_au1550();
break ;
case ALCHEMY_CPU_AU1300:
alchemy_sleep_au1300();
break ;
}
restore_core_regs();
}
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