arch/arm/mach-omap/ocpi.c

   1 /*
   2  * linux/arch/arm/mach-omap/ocpi.c
   3  *
   4  * Minimal OCP bus support for OMAP-1610 and OMAP-5912
   5  *
   6  * Copyright (C) 2003 - 2004 Nokia Corporation
   7  * Written by Tony Lindgren <tony@atomide.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #include <linux/config.h>
  25 #include <linux/module.h>
  26 #include <linux/version.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
  33 #include <asm/io.h>
  34 #include <asm/arch/hardware.h>
  35
  36 #define OCPI_BASE               0xfffec320
  37 #define OCPI_FAULT              (OCPI_BASE + 0x00)
  38 #define OCPI_CMD_FAULT          (OCPI_BASE + 0x04)
  39 #define OCPI_SINT0              (OCPI_BASE + 0x08)
  40 #define OCPI_TABORT             (OCPI_BASE + 0x0c)
  41 #define OCPI_SINT1              (OCPI_BASE + 0x10)
  42 #define OCPI_PROT               (OCPI_BASE + 0x14)
  43 #define OCPI_SEC                (OCPI_BASE + 0x18)
  44
  45 #define EN_OCPI_CK              (1 << 0)
  46 #define IDLOCPI_ARM             (1 << 1)
  47
  48 /* USB OHCI OCPI access error registers */
  49 #define HOSTUEADDR      0xfffba0e0
  50 #define HOSTUESTATUS    0xfffba0e4
  51
  52 /*
  53  * Enables device access to OMAP buses via the OCPI bridge
  54  * FIXME: Add locking
  55  */
  56 int ocpi_enable(void)
  57 {
  58         unsigned int val;
  59
  60         /* Make sure there's clock for OCPI */
  61
  62 #if defined(CONFIG_ARCH_OMAP1610) || defined(CONFIG_ARCH_OMAP1710)
  63         if (cpu_is_omap1610() || cpu_is_omap1710()) {
  64                 val = omap_readl(OMAP1610_ARM_IDLECT3);
  65                 val |= EN_OCPI_CK;
  66                 val &= ~IDLOCPI_ARM;
  67                 omap_writel(val, OMAP1610_ARM_IDLECT3);
  68         }
  69 #endif
  70 #ifdef CONFIG_ARCH_OMAP5912
  71         if (cpu_is_omap5912()) {
  72                 val = omap_readl(OMAP5912_ARM_IDLECT3);
  73                 val |= EN_OCPI_CK;
  74                 val &= ~IDLOCPI_ARM;
  75                 omap_writel(val, OMAP5912_ARM_IDLECT3);
  76         }
  77 #endif
  78         /* Enable access for OHCI in OCPI */
  79         val = omap_readl(OCPI_PROT);
  80         val &= ~0xff;
  81         //val &= (1 << 0);      /* Allow access only to EMIFS */
  82         omap_writel(val, OCPI_PROT);
  83
  84         val = omap_readl(OCPI_SEC);
  85         val &= ~0xff;
  86         omap_writel(val, OCPI_SEC);
  87
  88         return 0;
  89 }
  90 EXPORT_SYMBOL(ocpi_enable);
  91
  92 int ocpi_status(void)
  93 {
  94         printk("OCPI: addr: 0x%08x cmd: 0x%08x\n"
  95                "      ohci-addr: 0x%08x ohci-status: 0x%08x\n",
  96                omap_readl(OCPI_FAULT), omap_readl(OCPI_CMD_FAULT),
  97                omap_readl(HOSTUEADDR), omap_readl(HOSTUESTATUS));
  98
  99         return 1;
 100 }
 101 EXPORT_SYMBOL(ocpi_status);
 102
 103 static int __init omap_ocpi_init(void)
 104 {
 105         ocpi_enable();
 106         printk("OMAP OCPI interconnect driver loaded\n");
 107
 108         return 0;
 109 }
 110
 111 static void __exit omap_ocpi_exit(void)
 112 {
 113         /* FIXME: Disable OCPI */
 114 }
 115
 116 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 117 MODULE_DESCRIPTION("OMAP OCPI bus controller module");
 118 MODULE_LICENSE("GPL");
 119 module_init(omap_ocpi_init);
 120 module_exit(omap_ocpi_exit);