Hi Alan,
On 5/22/15 1:02 PM, Alan Tull wrote:
> Add code that requests that the sdr controller go into
> self-refresh mode. This code is run from ocram.
>
> This patch assumes that u-boot has already configured sdr:
> sdr.ctrlcfg.lowpwreq.selfrfshmask = 3
> sdr.ctrlcfg.lowpwrtiming.clkdisablecycles = 8
> sdr.ctrlcfg.dramtiming4.selfrfshexit = 512
>
> Suspend-to-RAM and EDAC support are mutually exclusive on SOCFPGA
> platforms. CONFIG_SOCFPGA_SUSPEND enables suspend-to-RAM and
> prevents selecting CONFIG_EDAC_ALTERA_MC.
>
> How to suspend to ram:
> $ echo enabled > \
> /sys/devices/soc/ffc02000.serial0/tty/ttyS0/power/wakeup
>
> $ echo -n mem > /sys/power/state
>
> Signed-off-by: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx>
> Cc: Pavel Machek <pavel@xxxxxxx>
> Cc: Arnd Bergmann <arnd@xxxxxxxx>
> Cc: Dinh Nguyen <dinguyen@xxxxxxxxxxxxxxxxxxxxx>
> Cc: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
> ---
> v2: use Generic on-chip SRAM driver to allocate ocram
> rm fncpy_align since generic allocator handles alignment
> check __arm_ioremap_exec return code
> check for NULL pointers
> add a comment regarding sdram controller configuration
> v3: fix renamed #define
> propagate socfpga_setup_ocram_self_refresh error code
> v4: Kconfig: don't need to select GENERIC_ALLOCATER
> add CONFIG_SOCFPGA_SUSPEND
> make s2r and EDAC support mutually exclusive
> socfpga.c: add sdr_ctl_base_addr
> return error if ocram not available in device tree
> update copyright years
> ---
<snip>
> +
> +static int socfpga_pm_suspend(unsigned long arg)
> +{
> + u32 ret;
> +
> + if (!sdr_ctl_base_addr || !socfpga_scu_base_addr)
> + return -EFAULT;
> +
> + ret = socfpga_sdram_self_refresh_in_ocram(
> + (u32)sdr_ctl_base_addr, (u32)socfpga_scu_base_addr);
> +
I had a patch that removed socfpga_scu_base_addr from being a global and
just a local variable in:
f6e14376fb20 ARM: socfpga: use of_iomap to map the SCU
This patch will be in v4.2 and is currently in arm-soc/next or
at my fork: kernel/git/dinguyen/linux.git socfpga_for_next_arria10
So you will either need to make socfpga_scu_base_addr global again, or
you can use the asm instruction to get the SCU base addr.
Sorry about that..
Dinh
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