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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [arm/] [plat-omap/] [ocpi.c] - Rev 3
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/* * linux/arch/arm/plat-omap/ocpi.c * * Minimal OCP bus support for omap16xx * * Copyright (C) 2003 - 2005 Nokia Corporation * Written by Tony Lindgren <tony@atomide.com> * * Modified for clock framework by Paul Mundt <paul.mundt@nokia.com>. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/module.h> #include <linux/types.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/spinlock.h> #include <linux/err.h> #include <linux/clk.h> #include <asm/io.h> #include <asm/hardware.h> #define OCPI_BASE 0xfffec320 #define OCPI_FAULT (OCPI_BASE + 0x00) #define OCPI_CMD_FAULT (OCPI_BASE + 0x04) #define OCPI_SINT0 (OCPI_BASE + 0x08) #define OCPI_TABORT (OCPI_BASE + 0x0c) #define OCPI_SINT1 (OCPI_BASE + 0x10) #define OCPI_PROT (OCPI_BASE + 0x14) #define OCPI_SEC (OCPI_BASE + 0x18) /* USB OHCI OCPI access error registers */ #define HOSTUEADDR 0xfffba0e0 #define HOSTUESTATUS 0xfffba0e4 static struct clk *ocpi_ck; /* * Enables device access to OMAP buses via the OCPI bridge * FIXME: Add locking */ int ocpi_enable(void) { unsigned int val; if (!cpu_is_omap16xx()) return -ENODEV; /* Enable access for OHCI in OCPI */ val = omap_readl(OCPI_PROT); val &= ~0xff; //val &= (1 << 0); /* Allow access only to EMIFS */ omap_writel(val, OCPI_PROT); val = omap_readl(OCPI_SEC); val &= ~0xff; omap_writel(val, OCPI_SEC); return 0; } EXPORT_SYMBOL(ocpi_enable); static int __init omap_ocpi_init(void) { if (!cpu_is_omap16xx()) return -ENODEV; ocpi_ck = clk_get(NULL, "l3_ocpi_ck"); if (IS_ERR(ocpi_ck)) return PTR_ERR(ocpi_ck); clk_enable(ocpi_ck); ocpi_enable(); printk("OMAP OCPI interconnect driver loaded\n"); return 0; } static void __exit omap_ocpi_exit(void) { /* REVISIT: Disable OCPI */ if (!cpu_is_omap16xx()) return; clk_disable(ocpi_ck); clk_put(ocpi_ck); } MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>"); MODULE_DESCRIPTION("OMAP OCPI bus controller module"); MODULE_LICENSE("GPL"); module_init(omap_ocpi_init); module_exit(omap_ocpi_exit);