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
  14 #include <asm/io.h>
  15 #include <asm/irq.h>
  16
  17 /*
  18  * You can connect Compact Flash directly to the bus of SuperH.
  19  * This is the enabler for that.
  20  *
  21  * SIM: How generic is this really? It looks pretty board, or at
  22  * least SH sub-type, specific to me.
  23  * I know it doesn't work on the Overdrive!
  24  */
  25
  26 /*
  27  * 0xB8000000 : Attribute
  28  * 0xB8001000 : Common Memory
  29  * 0xBA000000 : I/O
  30  */
  31 #if defined(CONFIG_IDE) && defined(CONFIG_CPU_SH4)
  32 /* SH4 can't access PCMCIA interface through P2 area.
  33  * we must remap it with appropreate attribute bit of the page set.
  34  * this part is based on Greg Banks' hd64465_ss.c implementation - Masahiro Abe */
  35 #include <linux/mm.h>
  36 #include <linux/vmalloc.h>
  37
  38 #if defined(CONFIG_CF_AREA6)
  39 #define slot_no 0
  40 #else
  41 #define slot_no 1
  42 #endif
  43
  44 /* defined in mm/ioremap.c */
  45 extern void * p3_ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags);
  46
  47 /* use this pointer to access to directly connected compact flash io area*/
  48 void *cf_io_base;
  49
  50 static int __init allocate_cf_area(void)
  51 {
  52         pgprot_t prot;
  53         unsigned long paddrbase, psize;
  54
  55         /* open I/O area window */
  56         paddrbase = virt_to_phys((void*)CONFIG_CF_BASE_ADDR);
  57         psize = PAGE_SIZE;
  58         prot = PAGE_KERNEL_PCC(slot_no, _PAGE_PCC_IO16);
  59         cf_io_base = p3_ioremap(paddrbase, psize, prot.pgprot);
  60         if (!cf_io_base) {
  61                 printk("allocate_cf_area : can't open CF I/O window!\n");
  62                 return -ENOMEM;
  63         }
  64 /*      printk("p3_ioremap(paddr=0x%08lx, psize=0x%08lx, prot=0x%08lx)=0x%08lx\n",
  65                 paddrbase, psize, prot.pgprot, cf_io_base);*/
  66
  67         /* XXX : do we need attribute and common-memory area also? */
  68
  69         return 0;
  70 }
  71 #endif
  72
  73 static int __init cf_init_default(void)
  74 {
  75 /* You must have enabled the card, and set the level interrupt
  76  * before reaching this point. Possibly in boot ROM or boot loader.
  77  */
  78 #if defined(CONFIG_IDE) && defined(CONFIG_CPU_SH4)
  79         allocate_cf_area();
  80 #endif
  81 #if defined(CONFIG_SH_UNKNOWN)
  82         /* This should be done in each board's init_xxx_irq. */
  83         make_imask_irq(14);
  84         disable_irq(14);
  85 #endif
  86         return 0;
  87 }
  88
  89 #if defined(CONFIG_SH_SOLUTION_ENGINE)
  90 #include <asm/se/se.h>
  91
  92 /*
  93  * SolutionEngine
  94  *
  95  * 0xB8400000 : Common Memory
  96  * 0xB8500000 : Attribute
  97  * 0xB8600000 : I/O
  98  */
  99
 100 static int __init cf_init_se(void)
 101 {
 102         if ((ctrl_inw(MRSHPC_CSR) & 0x000c) != 0)
 103                 return 0;       /* Not detected */
 104
 105         if ((ctrl_inw(MRSHPC_CSR) & 0x0080) == 0) {
 106                 ctrl_outw(0x0674, MRSHPC_CPWCR); /* Card Vcc is 3.3v? */
 107         } else {
 108                 ctrl_outw(0x0678, MRSHPC_CPWCR); /* Card Vcc is 5V */
 109         }
 110
 111         /*
 112          *  PC-Card window open
 113          *  flag == COMMON/ATTRIBUTE/IO
 114          */
 115         /* common window open */
 116         ctrl_outw(0x8a84, MRSHPC_MW0CR1);/* window 0xb8400000 */
 117         if((ctrl_inw(MRSHPC_CSR) & 0x4000) != 0)
 118                 /* common mode & bus width 16bit SWAP = 1*/
 119                 ctrl_outw(0x0b00, MRSHPC_MW0CR2);
 120         else
 121                 /* common mode & bus width 16bit SWAP = 0*/
 122                 ctrl_outw(0x0300, MRSHPC_MW0CR2);
 123
 124         /* attribute window open */
 125         ctrl_outw(0x8a85, MRSHPC_MW1CR1);/* window 0xb8500000 */
 126         if ((ctrl_inw(MRSHPC_CSR) & 0x4000) != 0)
 127                 /* attribute mode & bus width 16bit SWAP = 1*/
 128                 ctrl_outw(0x0a00, MRSHPC_MW1CR2);
 129         else
 130                 /* attribute mode & bus width 16bit SWAP = 0*/
 131                 ctrl_outw(0x0200, MRSHPC_MW1CR2);
 132
 133         /* I/O window open */
 134         ctrl_outw(0x8a86, MRSHPC_IOWCR1);/* I/O window 0xb8600000 */
 135         ctrl_outw(0x0008, MRSHPC_CDCR);  /* I/O card mode */
 136         if ((ctrl_inw(MRSHPC_CSR) & 0x4000) != 0)
 137                 ctrl_outw(0x0a00, MRSHPC_IOWCR2); /* bus width 16bit SWAP = 1*/
 138         else
 139                 ctrl_outw(0x0200, MRSHPC_IOWCR2); /* bus width 16bit SWAP = 0*/
 140
 141         ctrl_outw(0x2000, MRSHPC_ICR);
 142         ctrl_outb(0x00, PA_MRSHPC_MW2 + 0x206);
 143         ctrl_outb(0x42, PA_MRSHPC_MW2 + 0x200);
 144         return 0;
 145 }
 146 #endif
 147
 148 int __init cf_init(void)
 149 {
 150 #if defined(CONFIG_SH_SOLUTION_ENGINE)
 151         if (MACH_SE)
 152                 return cf_init_se();
 153 #endif
 154         return cf_init_default();
 155 }
 156
 157 __initcall (cf_init);