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 is removed.
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

Signed-off-by: Peter Chen <peter.chen@freescale.com>
usb: chipidea: imx: select usb id pin using syscon interface

otg_id_pin_select_change is set, we need to select usb id pin.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
usb: chipidea: usbmisc: rename file, struct and functions to usbmisc_imx

This driver will be used for every Freescale SoC which has this misc
memory layout to control the basic usb handling. So better name this
driver, function and struct names in a more generic way.

Reported-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
usb: chipidea: usbmisc: unset global varibale usbmisc on driver remove

The probe function checks usbmisc to be NULL in the beginning. Without
this patch the can only be loaded once.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
usb: chipidea: usbmisc: fix a potential race condition

This fixes a potential race condition where the ci13xxx_imx glue code
could be fast enough to call one of the usbmisc_ops before he got a
valid value on the static usbmisc pointer. To fix that we first set
usbmisc, then call usbmisc_set_ops().

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
usb: chipidea: usbmisc: prepare driver to handle more than one soc

This attaches the usbmisc_ops to the of_device_id data and
makes it possible to define special functions per soc.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
usb: chipidea: usbmisc: add mx53 support

This adds mx53 as the next user of the usbmisc driver and makes it
possible to disable the overcurrent-detection of the internal phy.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
usb: chipidea: usbmisc: add post handling and errata fix for mx25

This adds a post handling routine which is called after
ci13xxx_add_device was called. The first user is the mx25, which has to
disable the external-vbus-divider after the udc has started.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
usb: chipidea: imx: Add system suspend/resume API

During the system suspend/resume procedure, the USB also
needs to go suspend/resume procedure, this patch adds
related APIs. It is tested at i.mx6q sabrelite. Meanwhile,
it fixes the bug that the USB will out of work after
system suspend/resume.

Signed-off-by: Peter Chen <peter.chen@freescale.com>