There is a defect in imx6 LPM design.  When SW tries to enter low power
mode with following sequence, the chip will enter low power mode before
A9 CPU execute WFI instruction:

1. Set CCM_CLPCR[1:0] to 2'b00;
2. ARM CPU enters WFI;
3. ARM CPU wakeup from an interrupt event, which is masked by GPC or not
   visible to GPC, such as interrupt from local timer;
4. Set CCM_CLPCR[1:0] to 2'b01 or 2'b10;
5. ARM CPU execute WFI.

Before the last step, the chip will enter WAIT mode if CCM_CLPCR[1:0] is
set to 2'b01, or enter STOP mode if CCM_CLPCR[1:0] is set to 2'b10.

The patch implements a recommended workaround for this issue.

1. SW triggers irq #32(IOMUX) to be always pending manually by setting
   IOMUX_GPR1_GINT bit;
2. SW should then unmask it in GPC before setting CCM LPM;
3. SW should mask it right after CCM LPM is set (bit0-1 of CCM_CLPCR).
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

The WB and RBC configuration calls are currently made from
imx6q_set_lpm() for WAIT_CLOCKED and WAIT_UNCLOCKED mode with a simple
state tracking.  This becomes unnecessary since we can make the calls
from imx6q_pm_enter() directly now for suspend.

More importantly, the current call of imx6q_enable_wb() from
imx6q_set_lpm() is buggy.  The CLPCR register bits configured by
imx6q_enable_wb() will get lost, because imx6q_set_lpm() caches the same
register and write it back at the end of the function.  That's why the
imx6dl suspend/resume does not work currently - the wakeup from suspend
triggers a reset on imx6dl.

Moves the WB and RBC calls into imx6q_pm_enter() to save the state
tracking and fixes above bug, so that suspend/resume can start working
on imx6dl.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

The LPM (Low Power Mode) code that currently sits in imx6q clock driver
will be reused by imx6sl.  Let's move it into pm-imx6q.c, so that we
can keep clock driver SoC specific and reuse pm-imx6q.c on imx6sl.

In order to avoid adding another ioremap for CCM block,
imx6q_pm_set_ccm_base() is created to let clock driver set up ccm_base
for pm code.

During the move, the unused CCGR macros get removed.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Since commit 70dc8a48 (checkpatch: warn when using extern with function
prototypes in .h files), we will get checkpatch warning when updating
common.h following the existing convention which has extern for function
prototypes.

Let's change the convention to not use extern with function prototypes
in this header.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

From hotplug stress test result, resetting core during enable/disable
operation can improve cpu hotplug stability.  So let's set
SRC reset bit in imx_enable_cpu() for the core when its enable bit is
accessed.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

When imx_cpu_die() is being called, the cpu should never return from the
call but just in WFI and wait for hardware to take it down.  So let's
do cpu_do_idle() repeatly in the call.  Doing this help improve the
relibility of hotplug operation.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

This is very useful for detecting 'circular locking dependency' issues.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Having CONFIG_DEBUG_GPIO=y leads to several debug messages polluting kernel log:

[    0.580325] of_get_named_gpio_flags: can't parse gpios property of node '/regulators/3p3v[0]'
[    0.581185] 3P3V: 3300 mV
[    0.584827] of_get_named_gpio_flags exited with status 124
[    0.585852] vddio-sd0: 3300 mV
[    0.590023] of_get_named_gpio_flags exited with status 79
[    0.590770] fec-3v3: 3300 mV
[    0.594805] of_get_named_gpio_flags exited with status 105
[    0.595491] usb0_vbus: 5000 mV
[    0.599687] of_get_named_gpio_flags exited with status 104
[    0.600380] usb1_vbus: 5000 mV
[    0.604463] of_get_named_gpio_flags exited with status 126
[    0.605153] lcd-3v3: 3300 mV
[    0.608970] of_get_named_gpio_flags exited with status 77

Turn this option off, as these messages are not really useful for normal usage.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

The imx6q_restart() works fine with normal reboot but will run into
problem with emergency reboot like sysrq-b.  In that case, of_iomap()
gets called from interrupt context and hence triggers the BUG_ON in
__get_vm_area_node().

Actually, since commit c1e31d12 (ARM: imx: create
mxc_arch_reset_init_dt() for DT boot), imx6q/dl should try to use
mxc_restart() by calling mxc_arch_reset_init_dt() beforehand, where
things like of_iomap() can be done.

The patch updates mxc_restart() a little bit to get it work for imx6q/dl
and kill imx6q_restart() completely.
Reported-by: NNathan Lynch <nathan_lynch@mentor.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

As mx53 is a dt-only SoC, we should retrieve the iomuxc base address from the
device tree, instead of using the old MX53_IO_ADDRESS method.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

As mx53 is a dt-only SoC, we should retrieve the tzic base address from the
device tree, instead of using the old MX53_IO_ADDRESS method.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

As mx53 is a dt-only SoC, we should retrieve the gpt base address and irq
from the device tree, instead of using the old MX53_IO_ADDRESS method.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Generated by doing:

make mxs_defconfig
Manually selected the CHIPIDEA_UDC driver
make savedefconfig
cp defconfig arch/arm/configs/mxs_defconfig
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

The IS_ERR() macro is defined in the linux/err.h header file, so include
it explicitly.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Generated by doing:

make imx_v6_v7_defconfig
Manually selected the CHIPIDEA_UDC driver
make savedefconfig
cp defconfig arch/arm/configs/imx_v6_v7_defconfig
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Generated by doing:

make imx_v6_v7_defconfig
Manually selected the IMX_SPDIF driver
make savedefconfig
cp defconfig arch/arm/configs/imx_v6_v7_defconfig
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Update imx6q clock initialization and Kconfig for PCIe support.
Signed-off-by: NSean Cross <xobs@kosagi.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

The i.MX6 has two general-purpose LVDS clocks that can be driven
from a variety of sources.  This patch adds a mux and a gate for
both of these clocks.
Signed-off-by: NSean Cross <xobs@kosagi.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

The mx53_display_revision() declaration in common.h is stale and used
nowhere, so remove it.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

The patch enables soc bus infrastructure and adds a function
imx_soc_device_init() to report soc info via soc device interface for
imx6qdl and imx6sl.  With the support, user space can get soc related
info by looking at sysfs like below.

  $ cat /sys/devices/soc0/machine
  Freescale i.MX6 Quad SABRE Smart Device Board
  $ cat /sys/devices/soc0/family
  Freescale i.MX
  $ cat /sys/devices/soc0/soc_id
  i.MX6Q
  $ cat /sys/devices/soc0/revision
  1.2
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Add imx6sl support into imx_init_revision_from_anatop(), so that it can
be used to initialize cpu type and revision on imx6sl.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

The patch creates a common function imx_init_revision_from_anatop() by
merging imx6q_init_revision() and imx_anatop_get_digprog(), so that any
SoC that encodes revision info in anatop can use it to initialize
revision.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

It calls imx_set_soc_revision() to set up soc revision in
imx6q_init_revision(), and replaces all the occurrences of
imx6q_revision() with common helper imx_get_soc_revision().
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Similar to what we do for cpu type, the patch adds helper functions
imx_set_soc_revision() and imx_get_soc_revision() to maintain
imx_soc_revision in cpu.c.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Add low-level debug support for vybrid, so that earlyprintk can be
enabled for debugging early boot issue.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

This flag is a NOOP since 2.6.35 and can be removed.

This is an update for 3.11 of a patch already sent for 3.10
Signed-off-by: NMichael Opdenacker <michael.opdenacker@free-electrons.com>
Acked-by: NSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Config iomux-gpr1 to select clock source for fec system clock.
Clear gpr1[14], gpr1[18-17] bit to select the fec clock source
from internal anatop PLL.
Signed-off-by: NFugang Duan <B38611@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Add imx6sl iomux-gpr register field define in "imx6q-iomuxc-gpr.h" header
file, which is not fully define all iomux-gpr registers and fields, only
add fec related macro define.
Signed-off-by: NFugang Duan <B38611@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

There's a pll4_audio_div clock, an extra divider for pll4, missing
in current clock tree, thus add it.
Signed-off-by: NNicolin Chen <b42378@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

With arch/arm calling of_clk_init(NULL) from time_init(), we can now
remove custom .init_time hooks.
Signed-off-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: NTony Prisk <linux@prisktech.co.nz>

With arch/arm calling of_clk_init(NULL) from time_init(), we can now
remove custom .init_time hooks. The call to versatile_sched_clock_init
is moved to .init_early instead, were it is also for non-DT boards.
Signed-off-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: NJon Medhurst (Tixy) <tixy@linaro.org>
Acked-by: NPawel Moll <pawel.moll@arm.com>

With arch/arm calling of_clk_init(NULL) from time_init(), we can now
remove custom .init_time hooks.
Signed-off-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: NStephen Warren <swarren@nvidia.com>

With arch/arm calling of_clk_init(NULL) from time_init(), we can now
remove custom .init_time hooks.
Signed-off-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

With arch/arm calling of_clk_init(NULL) from time_init(), we can now
remove custom .init_time hooks. To get rid of it, move l2cc init to
.init_machine hook instead.
Signed-off-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: NSrinivas Kandagatla <srinivas.kandagatla@st.com>

With arch/arm calling of_clk_init(NULL) from time_init(), we can now
remove custom .init_time hooks.
Signed-off-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: NDinh Nguyen <dinguyen@altera.com>

With arch/arm calling of_clk_init(NULL) from time_init(), we can now
remove custom .init_time hooks.
Signed-off-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: NHeiko Stuebner <heiko@sntech.de>

With arch/arm calling of_clk_init(NULL) from time_init(), we can now
remove custom .init_time hooks.
Signed-off-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: NBarry Song <baohua.song@csr.com>

With arch/arm calling of_clk_init(NULL) from time_init(), we can now
remove custom .init_time hooks.
Signed-off-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>