Merge with /pub/scm/linux/kernel/git/torvalds/linux-2.6.git (68984aed) · Commits · e / devices / android_kernel_teracube_2e

Documentation/arm/Samsung-S3C24XX/USB-Host.txt

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		S3C24XX USB Host support
		========================



		Introduction
		------------

		This document details the S3C2410/S3C2440 in-built OHCI USB host support.

		Configuration
		-------------

		Enable at least the following kernel options:

		menuconfig:

		Device Drivers --->
		USB support --->
		<*> Support for Host-side USB
		<*> OHCI HCD support


		.config:
		CONFIG_USB
		CONFIG_USB_OHCI_HCD


		Once these options are configured, the standard set of USB device
		drivers can be configured and used.


		Board Support
		-------------

		The driver attaches to a platform device, which will need to be
		added by the board specific support file in linux/arch/arm/mach-s3c2410,
		such as mach-bast.c or mach-smdk2410.c

		The platform device's platform_data field is only needed if the
		board implements extra power control or over-current monitoring.

		The OHCI driver does not ensure the state of the S3C2410's MISCCTRL
		register, so if both ports are to be used for the host, then it is
		the board support file's responsibility to ensure that the second
		port is configured to be connected to the OHCI core.


		Platform Data
		-------------

		See linux/include/asm-arm/arch-s3c2410/usb-control.h for the
		descriptions of the platform device data. An implementation
		can be found in linux/arch/arm/mach-s3c2410/usb-simtec.c .

		The `struct s3c2410_hcd_info` contains a pair of functions
		that get called to enable over-current detection, and to
		control the port power status.

		The ports are numbered 0 and 1.

		power_control:

		Called to enable or disable the power on the port.

		enable_oc:

		Called to enable or disable the over-current monitoring.
		This should claim or release the resources being used to
		check the power condition on the port, such as an IRQ.

		report_oc:

		The OHCI driver fills this field in for the over-current code
		to call when there is a change to the over-current state on
		an port. The ports argument is a bitmask of 1 bit per port,
		with bit X being 1 for an over-current on port X.

		The function s3c2410_usb_report_oc() has been provided to
		ensure this is called correctly.

		port[x]:

		This is struct describes each port, 0 or 1. The platform driver
		should set the flags field of each port to S3C_HCDFLG_USED if
		the port is enabled.



		Document Author
		---------------

		Ben Dooks, (c) 2005 Simtec Electronics

MAINTAINERS

+1 −1

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		@@ -784,7 +784,7 @@ DVB SUBSYSTEM AND DRIVERS
		P: LinuxTV.org Project
		M: linux-dvb-maintainer@linuxtv.org
		L: linux-dvb@linuxtv.org (subscription required)
		W: http://linuxtv.org/developer/dvb.xml
		W: http://linuxtv.org/
		S: Supported

		EATA-DMA SCSI DRIVER

arch/arm/kernel/entry-armv.S

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		@@ -533,6 +533,13 @@ ENTRY(__switch_to)
		ldr r3, [r2, #TI_TP_VALUE]
		stmia ip!, {r4 - sl, fp, sp, lr} @ Store most regs on stack
		ldr r6, [r2, #TI_CPU_DOMAIN]!
		#if __LINUX_ARM_ARCH__ >= 6
		#ifdef CONFIG_CPU_MPCORE
		clrex
		#else
		strex r3, r4, [ip] @ Clear exclusive monitor
		#endif
		#endif
		#if defined(CONFIG_CPU_XSCALE) && !defined(CONFIG_IWMMXT)
		mra r4, r5, acc0
		stmia ip, {r4, r5}

arch/arm/lib/bitops.h

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		#if __LINUX_ARM_ARCH__ >= 6
		#include <linux/config.h>

		#if __LINUX_ARM_ARCH__ >= 6 && defined(CONFIG_CPU_MPCORE)
		.macro bitop, instr
		mov r2, #1
		and r3, r0, #7 @ Get bit offset

arch/arm/mach-s3c2410/usb-simtec.c

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		/* linux/arch/arm/mach-s3c2410/usb-simtec.c
		*
		* Copyright (c) 2004 Simtec Electronics
		* Copyright (c) 2004,2005 Simtec Electronics
		* Ben Dooks <ben@simtec.co.uk>
		*
		* http://www.simtec.co.uk/products/EB2410ITX/
		@@ -14,6 +14,8 @@
		* Modifications:
		* 14-Sep-2004 BJD Created
		* 18-Oct-2004 BJD Cleanups, and added code to report OC cleared
		* 09-Aug-2005 BJD Renamed s3c2410_report_oc to s3c2410_usb_report_oc
		* 09-Aug-2005 BJD Ports powered only if both are enabled
		*/

		#define DEBUG
		@@ -47,13 +49,19 @@
		* designed boards.
		*/

		static unsigned int power_state[2];

		static void
		usb_simtec_powercontrol(int port, int to)
		{
		pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);

		if (port == 1)
		s3c2410_gpio_setpin(S3C2410_GPB4, to ? 0:1);
		power_state[port] = to;

		if (power_state[0] && power_state[1])
		s3c2410_gpio_setpin(S3C2410_GPB4, 0);
		else
		s3c2410_gpio_setpin(S3C2410_GPB4, 1);
		}

		static irqreturn_t
		@@ -63,10 +71,10 @@ usb_simtec_ocirq(int irq, void pw, struct pt_regs regs)

		if (s3c2410_gpio_getpin(S3C2410_GPG10) == 0) {
		pr_debug("usb_simtec: over-current irq (oc detected)\n");
		s3c2410_report_oc(info, 3);
		s3c2410_usb_report_oc(info, 3);
		} else {
		pr_debug("usb_simtec: over-current irq (oc cleared)\n");
		s3c2410_report_oc(info, 0);
		s3c2410_usb_report_oc(info, 0);
		}

		return IRQ_HANDLED;