1/* 2 * linux/arch/arm/plat-omap/ocpi.c 3 * 4 * Minimal OCP bus support for omap16xx 5 * 6 * Copyright (C) 2003 - 2005 Nokia Corporation 7 * Written by Tony Lindgren <tony@atomide.com> 8 * 9 * Modified for clock framework by Paul Mundt <paul.mundt@nokia.com>. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 24 */ 25 26#include <linux/module.h> 27#include <linux/types.h> 28#include <linux/errno.h> 29#include <linux/kernel.h> 30#include <linux/init.h> 31#include <linux/spinlock.h> 32#include <linux/err.h> 33#include <linux/clk.h> 34#include <linux/io.h> 35 36#include <mach/hardware.h> 37 38#define OCPI_BASE 0xfffec320 39#define OCPI_FAULT (OCPI_BASE + 0x00) 40#define OCPI_CMD_FAULT (OCPI_BASE + 0x04) 41#define OCPI_SINT0 (OCPI_BASE + 0x08) 42#define OCPI_TABORT (OCPI_BASE + 0x0c) 43#define OCPI_SINT1 (OCPI_BASE + 0x10) 44#define OCPI_PROT (OCPI_BASE + 0x14) 45#define OCPI_SEC (OCPI_BASE + 0x18) 46 47/* USB OHCI OCPI access error registers */ 48#define HOSTUEADDR 0xfffba0e0 49#define HOSTUESTATUS 0xfffba0e4 50 51static struct clk *ocpi_ck; 52 53int ocpi_enable(void) 54{ 55 unsigned int val; 56 57 if (!cpu_is_omap16xx()) 58 return -ENODEV; 59 60 /* Enable access for OHCI in OCPI */ 61 val = omap_readl(OCPI_PROT); 62 val &= ~0xff; 63 //val &= (1 << 0); /* Allow access only to EMIFS */ 64 omap_writel(val, OCPI_PROT); 65 66 val = omap_readl(OCPI_SEC); 67 val &= ~0xff; 68 omap_writel(val, OCPI_SEC); 69 70 return 0; 71} 72EXPORT_SYMBOL(ocpi_enable); 73 74static int __init omap_ocpi_init(void) 75{ 76 if (!cpu_is_omap16xx()) 77 return -ENODEV; 78 79 ocpi_ck = clk_get(NULL, "l3_ocpi_ck"); 80 if (IS_ERR(ocpi_ck)) 81 return PTR_ERR(ocpi_ck); 82 83 clk_enable(ocpi_ck); 84 ocpi_enable(); 85 printk("OMAP OCPI interconnect driver loaded\n"); 86 87 return 0; 88} 89 90static void __exit omap_ocpi_exit(void) 91{ 92 /* REVISIT: Disable OCPI */ 93 94 if (!cpu_is_omap16xx()) 95 return; 96 97 clk_disable(ocpi_ck); 98 clk_put(ocpi_ck); 99} 100 101MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>"); 102MODULE_DESCRIPTION("OMAP OCPI bus controller module"); 103MODULE_LICENSE("GPL"); 104module_init(omap_ocpi_init); 105module_exit(omap_ocpi_exit); 106