LXR linux/arch/arm/mach-omap1/ocpi.c

   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 * Copyright (C) 2012 Texas Instruments, Inc.
   8 * Written by Tony Lindgren <tony@atomide.com>
   9 *
  10 * Modified for clock framework by Paul Mundt <paul.mundt@nokia.com>.
  11 *
  12 * This program is free software; you can redistribute it and/or modify
  13 * it under the terms of the GNU General Public License as published by
  14 * the Free Software Foundation; either version 2 of the License, or
  15 * (at your option) any later version.
  16 *
  17 * This program is distributed in the hope that it will be useful,
  18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  20 * GNU General Public License for more details.
  21 *
  22 * You should have received a copy of the GNU General Public License
  23 * along with this program; if not, write to the Free Software
  24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25 */
  26
  27#include <linux/module.h>
  28#include <linux/types.h>
  29#include <linux/errno.h>
  30#include <linux/kernel.h>
  31#include <linux/init.h>
  32#include <linux/spinlock.h>
  33#include <linux/err.h>
  34#include <linux/clk.h>
  35#include <linux/io.h>
  36
  37#include <mach/hardware.h>
  38
  39#include "common.h"
  40
  41#define OCPI_BASE               0xfffec320
  42#define OCPI_FAULT              (OCPI_BASE + 0x00)
  43#define OCPI_CMD_FAULT          (OCPI_BASE + 0x04)
  44#define OCPI_SINT0              (OCPI_BASE + 0x08)
  45#define OCPI_TABORT             (OCPI_BASE + 0x0c)
  46#define OCPI_SINT1              (OCPI_BASE + 0x10)
  47#define OCPI_PROT               (OCPI_BASE + 0x14)
  48#define OCPI_SEC                (OCPI_BASE + 0x18)
  49
  50/* USB OHCI OCPI access error registers */
  51#define HOSTUEADDR      0xfffba0e0
  52#define HOSTUESTATUS    0xfffba0e4
  53
  54static struct clk *ocpi_ck;
  55
  56/*
  57 * Enables device access to OMAP buses via the OCPI bridge
  58 * FIXME: Add locking
  59 */
  60int ocpi_enable(void)
  61{
  62        unsigned int val;
  63
  64        if (!cpu_is_omap16xx())
  65                return -ENODEV;
  66
  67        /* Enable access for OHCI in OCPI */
  68        val = omap_readl(OCPI_PROT);
  69        val &= ~0xff;
  70        /* val &= (1 << 0);      Allow access only to EMIFS */
  71        omap_writel(val, OCPI_PROT);
  72
  73        val = omap_readl(OCPI_SEC);
  74        val &= ~0xff;
  75        omap_writel(val, OCPI_SEC);
  76
  77        return 0;
  78}
  79EXPORT_SYMBOL(ocpi_enable);
  80
  81static int __init omap_ocpi_init(void)
  82{
  83        if (!cpu_is_omap16xx())
  84                return -ENODEV;
  85
  86        ocpi_ck = clk_get(NULL, "l3_ocpi_ck");
  87        if (IS_ERR(ocpi_ck))
  88                return PTR_ERR(ocpi_ck);
  89
  90        clk_enable(ocpi_ck);
  91        ocpi_enable();
  92        pr_info("OMAP OCPI interconnect driver loaded\n");
  93
  94        return 0;
  95}
  96
  97static void __exit omap_ocpi_exit(void)
  98{
  99        /* REVISIT: Disable OCPI */
 100
 101        if (!cpu_is_omap16xx())
 102                return;
 103
 104        clk_disable(ocpi_ck);
 105        clk_put(ocpi_ck);
 106}
 107
 108MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 109MODULE_DESCRIPTION("OMAP OCPI bus controller module");
 110MODULE_LICENSE("GPL");
 111module_init(omap_ocpi_init);
 112module_exit(omap_ocpi_exit);
 113