arch/sh/kernel/cf-enabler.c

   1 /* $Id: cf-enabler.c,v 1.4 2004/02/22 22:44:36 kkojima Exp $
   2  *
   3  *  linux/drivers/block/cf-enabler.c
   4  *
   5  *  Copyright (C) 1999  Niibe Yutaka
   6  *  Copyright (C) 2000  Toshiharu Nozawa
   7  *  Copyright (C) 2001  A&D Co., Ltd.
   8  *
   9  *  Enable the CF configuration.
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/mm.h>
  14 #include <linux/vmalloc.h>
  15 #include <linux/interrupt.h>
  16 #include <asm/io.h>
  17 #include <asm/irq.h>
  18
  19 /*
  20  * You can connect Compact Flash directly to the bus of SuperH.
  21  * This is the enabler for that.
  22  *
  23  * SIM: How generic is this really? It looks pretty board, or at
  24  * least SH sub-type, specific to me.
  25  * I know it doesn't work on the Overdrive!
  26  */
  27
  28 /*
  29  * 0xB8000000 : Attribute
  30  * 0xB8001000 : Common Memory
  31  * 0xBA000000 : I/O
  32  */
  33 #if defined(CONFIG_CPU_SH4)
  34 /* SH4 can't access PCMCIA interface through P2 area.
  35  * we must remap it with appropriate attribute bit of the page set.
  36  * this part is based on Greg Banks' hd64465_ss.c implementation - Masahiro Abe */
  37
  38 #if defined(CONFIG_CF_AREA6)
  39 #define slot_no 0
  40 #else
  41 #define slot_no 1
  42 #endif
  43
  44 /* use this pointer to access to directly connected compact flash io area*/
  45 void *cf_io_base;
  46
  47 static int __init allocate_cf_area(void)
  48 {
  49         pgprot_t prot;
  50         unsigned long paddrbase, psize;
  51
  52         /* open I/O area window */
  53         paddrbase = virt_to_phys((void*)CONFIG_CF_BASE_ADDR);
  54         psize = PAGE_SIZE;
  55         prot = PAGE_KERNEL_PCC(slot_no, _PAGE_PCC_IO16);
  56         cf_io_base = p3_ioremap(paddrbase, psize, prot.pgprot);
  57         if (!cf_io_base) {
  58                 printk("allocate_cf_area : can't open CF I/O window!\n");
  59                 return -ENOMEM;
  60         }
  61 /*      printk("p3_ioremap(paddr=0x%08lx, psize=0x%08lx, prot=0x%08lx)=0x%08lx\n",
  62                 paddrbase, psize, prot.pgprot, cf_io_base);*/
  63
  64         /* XXX : do we need attribute and common-memory area also? */
  65
  66         return 0;
  67 }
  68 #endif
  69
  70 static int __init cf_init_default(void)
  71 {
  72 /* You must have enabled the card, and set the level interrupt
  73  * before reaching this point. Possibly in boot ROM or boot loader.
  74  */
  75 #if defined(CONFIG_CPU_SH4)
  76         allocate_cf_area();
  77 #endif
  78
  79         return 0;
  80 }
  81
  82 #if defined(CONFIG_SH_SOLUTION_ENGINE)
  83 #include <asm/se.h>
  84 #elif defined(CONFIG_SH_7722_SOLUTION_ENGINE)
  85 #include <asm/se7722.h>
  86 #endif
  87
  88 /*
  89  * SolutionEngine Seriese
  90  *
  91  * about MS770xSE
  92  * 0xB8400000 : Common Memory
  93  * 0xB8500000 : Attribute
  94  * 0xB8600000 : I/O
  95  *
  96  * about MS7722SE
  97  * 0xB0400000 : Common Memory
  98  * 0xB0500000 : Attribute
  99  * 0xB0600000 : I/O
 100  */
 101
 102 #if defined(CONFIG_SH_SOLUTION_ENGINE) || defined(CONFIG_SH_7722_SOLUTION_ENGINE)
 103 static int __init cf_init_se(void)
 104 {
 105         if ((ctrl_inw(MRSHPC_CSR) & 0x000c) != 0)
 106                 return 0;       /* Not detected */
 107
 108         if ((ctrl_inw(MRSHPC_CSR) & 0x0080) == 0) {
 109                 ctrl_outw(0x0674, MRSHPC_CPWCR); /* Card Vcc is 3.3v? */
 110         } else {
 111                 ctrl_outw(0x0678, MRSHPC_CPWCR); /* Card Vcc is 5V */
 112         }
 113
 114         /*
 115          *  PC-Card window open
 116          *  flag == COMMON/ATTRIBUTE/IO
 117          */
 118         /* common window open */
 119         ctrl_outw(0x8a84, MRSHPC_MW0CR1);
 120         if((ctrl_inw(MRSHPC_CSR) & 0x4000) != 0)
 121                 /* common mode & bus width 16bit SWAP = 1*/
 122                 ctrl_outw(0x0b00, MRSHPC_MW0CR2);
 123         else
 124                 /* common mode & bus width 16bit SWAP = 0*/
 125                 ctrl_outw(0x0300, MRSHPC_MW0CR2);
 126
 127         /* attribute window open */
 128         ctrl_outw(0x8a85, MRSHPC_MW1CR1);
 129         if ((ctrl_inw(MRSHPC_CSR) & 0x4000) != 0)
 130                 /* attribute mode & bus width 16bit SWAP = 1*/
 131                 ctrl_outw(0x0a00, MRSHPC_MW1CR2);
 132         else
 133                 /* attribute mode & bus width 16bit SWAP = 0*/
 134                 ctrl_outw(0x0200, MRSHPC_MW1CR2);
 135
 136         /* I/O window open */
 137         ctrl_outw(0x8a86, MRSHPC_IOWCR1);
 138         ctrl_outw(0x0008, MRSHPC_CDCR);  /* I/O card mode */
 139         if ((ctrl_inw(MRSHPC_CSR) & 0x4000) != 0)
 140                 ctrl_outw(0x0a00, MRSHPC_IOWCR2); /* bus width 16bit SWAP = 1*/
 141         else
 142                 ctrl_outw(0x0200, MRSHPC_IOWCR2); /* bus width 16bit SWAP = 0*/
 143
 144         ctrl_outw(0x2000, MRSHPC_ICR);
 145         ctrl_outb(0x00, PA_MRSHPC_MW2 + 0x206);
 146         ctrl_outb(0x42, PA_MRSHPC_MW2 + 0x200);
 147         return 0;
 148 }
 149 #else
 150 static int __init cf_init_se(void)
 151 {
 152         return -1;
 153 }
 154 #endif
 155
 156 int __init cf_init(void)
 157 {
 158         if( mach_is_se() || mach_is_7722se() ){
 159                 return cf_init_se();
 160         }
 161
 162         return cf_init_default();
 163 }
 164
 165 __initcall (cf_init);