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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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e6f990a883
This removes the FIXME message above ocpi_enable being declared for proper locking in this function. As of the current kernel verisons there is no need for locking as only one driver uses this function currently and therefore there is no need for real locking requirements. Signed-off-by: Nicholas Krause <xerofoify@gmail.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/*
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* linux/arch/arm/plat-omap/ocpi.c
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*
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* Minimal OCP bus support for omap16xx
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*
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* Copyright (C) 2003 - 2005 Nokia Corporation
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* Copyright (C) 2012 Texas Instruments, Inc.
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* Written by Tony Lindgren <tony@atomide.com>
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*
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* Modified for clock framework by Paul Mundt <paul.mundt@nokia.com>.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include "common.h"
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#define OCPI_BASE 0xfffec320
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#define OCPI_FAULT (OCPI_BASE + 0x00)
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#define OCPI_CMD_FAULT (OCPI_BASE + 0x04)
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#define OCPI_SINT0 (OCPI_BASE + 0x08)
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#define OCPI_TABORT (OCPI_BASE + 0x0c)
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#define OCPI_SINT1 (OCPI_BASE + 0x10)
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#define OCPI_PROT (OCPI_BASE + 0x14)
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#define OCPI_SEC (OCPI_BASE + 0x18)
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/* USB OHCI OCPI access error registers */
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#define HOSTUEADDR 0xfffba0e0
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#define HOSTUESTATUS 0xfffba0e4
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static struct clk *ocpi_ck;
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/*
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* Enables device access to OMAP buses via the OCPI bridge
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*/
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int ocpi_enable(void)
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{
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unsigned int val;
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if (!cpu_is_omap16xx())
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return -ENODEV;
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/* Enable access for OHCI in OCPI */
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val = omap_readl(OCPI_PROT);
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val &= ~0xff;
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/* val &= (1 << 0); Allow access only to EMIFS */
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omap_writel(val, OCPI_PROT);
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val = omap_readl(OCPI_SEC);
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val &= ~0xff;
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omap_writel(val, OCPI_SEC);
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return 0;
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}
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EXPORT_SYMBOL(ocpi_enable);
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static int __init omap_ocpi_init(void)
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{
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if (!cpu_is_omap16xx())
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return -ENODEV;
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ocpi_ck = clk_get(NULL, "l3_ocpi_ck");
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if (IS_ERR(ocpi_ck))
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return PTR_ERR(ocpi_ck);
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clk_enable(ocpi_ck);
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ocpi_enable();
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pr_info("OMAP OCPI interconnect driver loaded\n");
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return 0;
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}
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static void __exit omap_ocpi_exit(void)
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{
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/* REVISIT: Disable OCPI */
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if (!cpu_is_omap16xx())
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return;
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clk_disable(ocpi_ck);
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clk_put(ocpi_ck);
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}
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MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
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MODULE_DESCRIPTION("OMAP OCPI bus controller module");
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MODULE_LICENSE("GPL");
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module_init(omap_ocpi_init);
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module_exit(omap_ocpi_exit);
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