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