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 <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
  37 #if defined(CONFIG_CF_AREA6)
  38 #define slot_no 0
  39 #else
  40 #define slot_no 1
  41 #endif
  42
  43 /* use this pointer to access to directly connected compact flash io area*/
  44 void *cf_io_base;
  45
  46 static int __init allocate_cf_area(void)
  47 {
  48         pgprot_t prot;
  49         unsigned long paddrbase, psize;
  50
  51         /* open I/O area window */
  52         paddrbase = virt_to_phys((void*)CONFIG_CF_BASE_ADDR);
  53         psize = PAGE_SIZE;
  54         prot = PAGE_KERNEL_PCC(slot_no, _PAGE_PCC_IO16);
  55         cf_io_base = p3_ioremap(paddrbase, psize, prot.pgprot);
  56         if (!cf_io_base) {
  57                 printk("allocate_cf_area : can't open CF I/O window!\n");
  58                 return -ENOMEM;
  59         }
  60 /*      printk("p3_ioremap(paddr=0x%08lx, psize=0x%08lx, prot=0x%08lx)=0x%08lx\n",
  61                 paddrbase, psize, prot.pgprot, cf_io_base);*/
  62
  63         /* XXX : do we need attribute and common-memory area also? */
  64
  65         return 0;
  66 }
  67 #endif
  68
  69 static int __init cf_init_default(void)
  70 {
  71 /* You must have enabled the card, and set the level interrupt
  72  * before reaching this point. Possibly in boot ROM or boot loader.
  73  */
  74 #if defined(CONFIG_IDE) && defined(CONFIG_CPU_SH4)
  75         allocate_cf_area();
  76 #endif
  77 #if defined(CONFIG_SH_UNKNOWN)
  78         /* This should be done in each board's init_xxx_irq. */
  79         make_imask_irq(14);
  80         disable_irq(14);
  81 #endif
  82         return 0;
  83 }
  84
  85 #if defined(CONFIG_SH_SOLUTION_ENGINE)
  86 #include <asm/se.h>
  87
  88 /*
  89  * SolutionEngine
  90  *
  91  * 0xB8400000 : Common Memory
  92  * 0xB8500000 : Attribute
  93  * 0xB8600000 : I/O
  94  */
  95
  96 static int __init cf_init_se(void)
  97 {
  98         if ((ctrl_inw(MRSHPC_CSR) & 0x000c) != 0)
  99                 return 0;       /* Not detected */
 100
 101         if ((ctrl_inw(MRSHPC_CSR) & 0x0080) == 0) {
 102                 ctrl_outw(0x0674, MRSHPC_CPWCR); /* Card Vcc is 3.3v? */
 103         } else {
 104                 ctrl_outw(0x0678, MRSHPC_CPWCR); /* Card Vcc is 5V */
 105         }
 106
 107         /*
 108          *  PC-Card window open
 109          *  flag == COMMON/ATTRIBUTE/IO
 110          */
 111         /* common window open */
 112         ctrl_outw(0x8a84, MRSHPC_MW0CR1);/* window 0xb8400000 */
 113         if((ctrl_inw(MRSHPC_CSR) & 0x4000) != 0)
 114                 /* common mode & bus width 16bit SWAP = 1*/
 115                 ctrl_outw(0x0b00, MRSHPC_MW0CR2);
 116         else
 117                 /* common mode & bus width 16bit SWAP = 0*/
 118                 ctrl_outw(0x0300, MRSHPC_MW0CR2);
 119
 120         /* attribute window open */
 121         ctrl_outw(0x8a85, MRSHPC_MW1CR1);/* window 0xb8500000 */
 122         if ((ctrl_inw(MRSHPC_CSR) & 0x4000) != 0)
 123                 /* attribute mode & bus width 16bit SWAP = 1*/
 124                 ctrl_outw(0x0a00, MRSHPC_MW1CR2);
 125         else
 126                 /* attribute mode & bus width 16bit SWAP = 0*/
 127                 ctrl_outw(0x0200, MRSHPC_MW1CR2);
 128
 129         /* I/O window open */
 130         ctrl_outw(0x8a86, MRSHPC_IOWCR1);/* I/O window 0xb8600000 */
 131         ctrl_outw(0x0008, MRSHPC_CDCR);  /* I/O card mode */
 132         if ((ctrl_inw(MRSHPC_CSR) & 0x4000) != 0)
 133                 ctrl_outw(0x0a00, MRSHPC_IOWCR2); /* bus width 16bit SWAP = 1*/
 134         else
 135                 ctrl_outw(0x0200, MRSHPC_IOWCR2); /* bus width 16bit SWAP = 0*/
 136
 137         ctrl_outw(0x2000, MRSHPC_ICR);
 138         ctrl_outb(0x00, PA_MRSHPC_MW2 + 0x206);
 139         ctrl_outb(0x42, PA_MRSHPC_MW2 + 0x200);
 140         return 0;
 141 }
 142 #endif
 143
 144 int __init cf_init(void)
 145 {
 146 #if defined(CONFIG_SH_SOLUTION_ENGINE)
 147         if (MACH_SE)
 148                 return cf_init_se();
 149 #endif
 150         return cf_init_default();
 151 }
 152
 153 __initcall (cf_init);