usb: chipidea: imx: add return value check for devm_regulator_get

- If devm_regulator_get returns -EPROBE_DEFER, we also return
-EPROBE_DEFER to wait regulator being ready later.
- If devm_regulator_get returns -ENODEV, we think there is
no "vbus-supply" node at DT, it means this board doesn't need
vbus control.
- If devm_regulator_get returns other error values, it means
there are something wrong for getting this regulator.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
usb: chipidea: udc: otg_set_peripheral is useless for some chipidea users

It is useless at below cases:
- If we implement both usb host and device at chipidea driver.
- If we don't need phy->otg.

Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
usb: chipidea: otg: Add otg file used to access otgsc

This file is mainly used to access otgsc currently, it may
add otg related things in the future.

Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
usb: chipidea: Add role init and destory APIs

- The role's init will be called at probe procedure.
- The role's destory will be called at fail patch
at probe and driver's removal.
- The role's start/stop will be called when specific
role has started.

Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
usb: chipidea: add flag CI_HDRC_DUAL_ROLE_NOT_OTG

Since we need otgsc to know vbus's status at some chipidea
controllers even it is peripheral-only mode. Besides, some
SoCs (eg, AR9331 SoC) don't have otgsc register even
the DCCPARAMS_DC and DCCPARAMS_HC are both 1 at CAP_DCCPARAMS.

We inroduce flag CI_HDRC_DUAL_ROLE_NOT_OTG to indicate if the
controller is dual role, but not supports OTG. If this flag is
not set, we follow the rule that if DCCPARAMS_DC and DCCPARAMS_HC
are both 1 at CAP_DCCPARAMS, then this controller is otg capable.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
usb: chipidea: disable all interrupts and clear all interrupts status

During the initialization, it needs to disable all interrupts
enable bit as well as clear all interrupts status bits to avoid
exceptional interrupt.

Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
usb: chipidea: move otg relate things to otg file

Move otg relate things to otg file.

Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
usb: chipidea: add vbus interrupt handler

We add vbus interrupt handler at ci_otg_work, it uses OTGSC_BSV(at otgsc)
to know it is connect or disconnet event.
Meanwhile, we introduce two flags id_event and b_sess_valid_event to
indicate it is an id interrupt or a vbus interrupt.

Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
usb: chipidea: add wait vbus lower than OTGSC_BSV before role starts

When the gadget role starts, we need to make sure the vbus is lower
than OTGSC_BSV, or there will be an vbus interrupt since we use
B_SESSION_VALID as vbus interrupt to indicate connect and disconnect.
When the host role starts, it may not be useful to wait vbus to lower
than OTGSC_BSV, but it can indicate some hardware problems like the
vbus is still higher than OTGSC_BSV after we disconnect to host some
time later (5000 milliseconds currently), which is obvious not correct.

Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
usb: chipidea: udc: misuse flag CI_HDRC_REGS_SHARED and CI_HDRC_PULLUP_ON_VBUS

CI_HDRC_REGS_SHARED stands for the controller registers is shared
with other USB drivers, if all USB drivers are at chipidea/, it doesn't
needed to set.
CI_HDRC_PULLUP_ON_VBUS stands for pullup dp when the vbus is on. This
flag doesn't need to set if the vbus is always on for gadget
since dp has always pulled up after the gadget has initialized.

So, the current code seems to misuse this two flags.
- When the gadget initializes, the controller doesn't need to run if
it depends on vbus (CI_HDRC_PULLUP_ON_VBUS), it does not
relate to shared register.
- When the gadget starts (load one gadget module), the controller
can run if vbus is on (CI_HDRC_PULLUP_ON_VBUS), it also does not
relate to shared register.

Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
usb: chipidea: udc: .pullup is valid when vbus is on at CI_HDRC_PULLUP_ON_VBUS

When the flag CI_HDRC_PULLUP_ON_VBUS is set, .pullup should only be
called when the vbus is active. When the CI_HDRC_PULLUP_ON_VBUS
is set, the controller only begins to run when the vbus is on,
So, it is only meaningful software set pullup/pulldown after
the controller begins to run.

Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
usb: chipidea: udc: fix the oops when plugs in usb cable after rmmod gadget

When we rmmod gadget, the ci->driver needs to be cleared.
Otherwise, we plug in usb cable again, the driver will
consider gadget is there, in fact, it was removed.

Besides, consolidate the calling of ci->driver->disconnect, when
we do rmmod gadget, the gadget's disconnect should be called from
udc core.

Below is the oops this patch fixes.

root@freescale ~$ ci_hdrc ci_hdrc.0: Connected to host
Unable to handle kernel paging request at virtual address 7f01171c
pgd = 80004000
[7f01171c] *pgd=4fa1e811, *pte=00000000, *ppte=00000000
Internal error: Oops: 7 [#1] SMP ARM
Modules linked in: f_acm libcomposite u_serial [last unloaded: g_serial]
CPU: 0    Not tainted  (3.8.0-rc5+ #221)
PC is at _gadget_stop_activity+0xbc/0x128
LR is at ep_fifo_flush+0x68/0xa0
pc : [<803634cc>]    lr : [<80363938>]    psr: 20000193
sp : 806c7dc8  ip : 00000000  fp : 806c7de4
r10: 00000000  r9 : 80710ea4  r8 : 00000000
r7 : bf834094  r6 : bf834098  r5 : bf834010  r4 : bf8340a0
r3 : 7f011708  r2 : 01940194  r1 : a0000193  r0 : bf834014
Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: 10c53c7d  Table: 4f06404a  DAC: 00000017
Process swapper/0 (pid: 0, stack limit = 0x806c6238)
Stack: (0x806c7dc8 to 0x806c8000)
7dc0:                   bf834010 bf809950 bf834010 0000004b 806c7e44 806c7de8
7de0: 80365400 8036341c 0000ec1c 00000000 0000ec1c 00000040 fff5ede0 bf834014
7e00: 000a1220 00000000 0000002e ffffd958 806c7e3c 806c7e20 8004e870 bf834010
7e20: bf809950 0000004b 0000004b 00000000 80710ea4 00000000 806c7e5c 806c7e48
7e40: 80362888 80365154 bfb35180 bf809950 806c7e9c 806c7e60 8008111c 803627f4
7e60: 00989680 00000000 bf809900 bf809964 812df8c0 bf809900 bf809950 806c3f2c
7e80: 0000004b 00000000 412fc09a 00000000 806c7eb4 806c7ea0 80081368 800810b8
7ea0: bf809900 bf809950 806c7ecc 806c7eb8 800843c8 8008130c 0000004b 806cf748
7ec0: 806c7ee4 806c7ed0 80081088 8008432c 806c6000 806cf748 806c7f0c 806c7ee8
7ee0: 8000fa44 8008105c f400010c 806ce974 806c7f30 f4000110 806d29e8 412fc09a
7f00: 806c7f2c 806c7f10 80008584 8000f9f4 8000fbd0 60000013 ffffffff 806c7f64
7f20: 806c7f84 806c7f30 8000eac0 80008554 00000000 00000000 0000000f 8001aea0
7f40: 806c6000 80712a48 804f0040 00000000 806d29e8 412fc09a 00000000 806c7f84
7f60: 806c7f88 806c7f78 8000fbcc 8000fbd0 60000013 ffffffff 806c7fac 806c7f88
7f80: 8001015c 8000fb9c 806cf5b0 80712980 806a4528 8fffffff 1000406a 412fc09a
7fa0: 806c7fbc 806c7fb0 804e5334 800100ac 806c7ff4 806c7fc0 80668940 804e52d4
7fc0: ffffffff ffffffff 806684bc 00000000 00000000 806a4528 10c53c7d 806ce94c
7fe0: 806a4524 806d29dc 00000000 806c7ff8 10008078 806686b0 00000000 00000000
Backtrace:
[<80363410>] (_gadget_stop_activity+0x0/0x128) from [<80365400>] (udc_irq+0x2b8/0xf38)
 r7:0000004b r6:bf834010 r5:bf809950 r4:bf834010
 [<80365148>] (udc_irq+0x0/0xf38) from [<80362888>] (ci_irq+0xa0/0xf4)
[<803627e8>] (ci_irq+0x0/0xf4) from [<8008111c>] (handle_irq_event_percpu+0x70/0x254)
 r5:bf809950 r4:bfb35180
 [<800810ac>] (handle_irq_event_percpu+0x0/0x254) from [<80081368>] (handle_irq_event+0x68/0x88)
[<80081300>] (handle_irq_event+0x0/0x88) from [<800843c8>] (handle_fasteoi_irq+0xa8/0x178)
 r5:bf809950 r4:bf809900
 [<80084320>] (handle_fasteoi_irq+0x0/0x178) from [<80081088>] (generic_handle_irq+0x38/0x40)
 r5:806cf748 r4:0000004b
 [<80081050>] (generic_handle_irq+0x0/0x40) from [<8000fa44>] (handle_IRQ+0x5c/0xbc)
 r5:806cf748 r4:806c6000
 [<8000f9e8>] (handle_IRQ+0x0/0xbc) from [<80008584>] (gic_handle_irq+0x3c/0x70)
 r9:412fc09a r8:806d29e8 r7:f4000110 r6:806c7f30 r5:806ce974
 r4:f400010c
 [<80008548>] (gic_handle_irq+0x0/0x70) from [<8000eac0>] (__irq_svc+0x40/0x54)
Exception stack(0x806c7f30 to 0x806c7f78)
7f20:                                     00000000 00000000 0000000f 8001aea0
7f40: 806c6000 80712a48 804f0040 00000000 806d29e8 412fc09a 00000000 806c7f84
7f60: 806c7f88 806c7f78 8000fbcc 8000fbd0 60000013 ffffffff
 r7:806c7f64 r6:ffffffff r5:60000013 r4:8000fbd0
 [<8000fb90>] (default_idle+0x0/0x4c) from [<8001015c>] (cpu_idle+0xbc/0xf8)
[<800100a0>] (cpu_idle+0x0/0xf8) from [<804e5334>] (rest_init+0x6c/0x84)
 r9:412fc09a r8:1000406a r7:8fffffff r6:806a4528 r5:80712980
 r4:806cf5b0
 [<804e52c8>] (rest_init+0x0/0x84) from [<80668940>] (start_kernel+0x29c/0x2ec)
[<806686a4>] (start_kernel+0x0/0x2ec) from [<10008078>] (0x10008078)
Code: e12fff33 e5953200 e3530000 0a000002 (e5933014)
---[ end trace aade28ad434062bd ]---
Kernel panic - not syncing: 0xbf8bdfa8)
df60: 00000000 00000000 0000000f 8001aea0 bf8bc000 80712a48 804f0040 00000000
df80: 806d29e8 412fc09a 00000000 bf8bdfb4 bf8bdfb8 bf8bdfa8 8000fbcc 8000fbd0
dfa0: 60000013 ffffffff
 r7:bf8bdf94 r6:ffffffff r5:60000013 r4:8000fbd0
 [<8000fb90>] (default_idle+0x0/0x4c) from [<8001015c>] (cpu_idle+0xbc/0xf8)
[<800100a0>] (cpu_idle+0x0/0xf8) from [<804e7930>] (secondary_start_kernel+0x120/0x148)
 r9:412fc09a r8:1000406a r7:80712d20 r6:10c03c7d r5:00000002
 r4:806e2008
 [<804e7810>] (secondary_start_kernel+0x0/0x148) from [<104e7148>] (0x104e7148)
 r5:0000001f r4:4f8a806a
 CPU3: stopping
 Backtrace:
 [<800132e8>] (dump_backtrace+0x0/0x114) from [<804ea684>] (dump_stack+0x20/0x24)
 r7:00000000 r6:806c3f2c r5:806cf748 r4:80712d18
 [<804ea664>] (dump_stack+0x0/0x24) from [<80014adc>] (handle_IPI+0x140/0x18c)
[<8001499c>] (handle_IPI+0x0/0x18c) from [<800085b0>] (gic_handle_irq+0x68/0x70)
 r9:412fc09a r8:806d29e8 r7:f4000110 r6:bf8bff60 r5:806ce974
 r4:f400010c
 [<80008548>] (gic_handle_irq+0x0/0x70) from [<8000eac0>] (__irq_svc+0x40/0x54)
Exception stack(0xbf8bff60 to 0xbf8bffa8)
ff60: 00000000 00000000 0000000f 8001aea0 bf8be000 80712a48 804f0040 00000000
ff80: 806d29e8 412fc09a 00000000 bf8bffb4 bf8bffb8 bf8bffa8 8000fbcc 8000fbd0
ffa0: 60000013 ffffffff
 r7:bf8bff94 r6:ffffffff r5:60000013 r4:8000fbd0
 [<8000fb90>] (default_idle+0x0/0x4c) from [<8001015c>] (cpu_idle+0xbc/0xf8)
[<800100a0>] (cpu_idle+0x0/0xf8) from [<804e7930>] (secondary_start_kernel+0x120/0x148)
 r9:412fc09a r8:1000406a r7:80712d20 r6:10c03c7d r5:00000003
 r4:806e2008
 [<804e7810>] (secondary_start_kernel+0x0/0x148) from [<104e7148>] (0x104e7148)
 r5:0000001f r4:4f8a806a
 CPU1: stopping
 Backtrace:
 [<800132e8>] (dump_backtrace+0x0/0x114) from [<804ea684>] (dump_stack+0x20/0x24)
 r7:00000000 r6:806c3f2c r5:806cf748 r4:80712d18
 [<804ea664>] (dump_stack+0x0/0x24) from [<80014adc>] (handle_IPI+0x140/0x18c)
[<8001499c>] (handle_IPI+0x0/0x18c) from [<800085b0>] (gic_handle_irq+0x68/0x70)
 r9:412fc09a r8:806d29e8 r7:f4000110 r6:bf8bbf60 r5:806ce974
 r4:f400010c
 [<80008548>] (gic_handle_irq+0x0/0x70) from [<8000eac0>] (__irq_svc+0x40/0x54)
Exception stack(0xbf8bbf60 to 0xbf8bbfa8)
bf60: 00000000 00000000 0000000f 8001aea0 bf8ba000 80712a48 804f0040 00000000
bf80: 806d29e8 412fc09a 00000000 bf8bbfb4 bf8bbfb8 bf8bbfa8 8000fbcc 8000fbd0
bfa0: 60000013 ffffffff
 r7:bf8bbf94 r6:ffffffff r5:60000013 r4:8000fbd0
 [<8000fb90>] (default_idle+0x0/0x4c) from [<8001015c>] (cpu_idle+0xbc/0xf8)
[<800100a0>] (cpu_idle+0x0/0xf8) from [<804e7930>] (secondary_start_kernel+0x120/0x148)
 r9:412fc09a r8:1000406a r7:80712d20 r6:10c03c7d r5:00000001
 r4:806e2008

Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>