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cf-enabler.c

/* $Id: cf-enabler.c,v 1.4 2004/02/22 22:44:36 kkojima Exp $
 *
 *  linux/drivers/block/cf-enabler.c
 *
 *  Copyright (C) 1999  Niibe Yutaka
 *  Copyright (C) 2000  Toshiharu Nozawa
 *  Copyright (C) 2001  A&D Co., Ltd.
 *
 *  Enable the CF configuration.
 */

#include <linux/init.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <asm/irq.h>

/*
 * You can connect Compact Flash directly to the bus of SuperH.
 * This is the enabler for that.
 *
 * SIM: How generic is this really? It looks pretty board, or at
 * least SH sub-type, specific to me.
 * I know it doesn't work on the Overdrive!
 */

/*
 * 0xB8000000 : Attribute
 * 0xB8001000 : Common Memory
 * 0xBA000000 : I/O
 */
#if defined(CONFIG_CPU_SH4)
/* SH4 can't access PCMCIA interface through P2 area.
 * we must remap it with appropriate attribute bit of the page set.
 * this part is based on Greg Banks' hd64465_ss.c implementation - Masahiro Abe */

#if defined(CONFIG_CF_AREA6)
#define slot_no 0
#else
#define slot_no 1
#endif

/* use this pointer to access to directly connected compact flash io area*/
void *cf_io_base;

static int __init allocate_cf_area(void)
{
      pgprot_t prot;
      unsigned long paddrbase, psize;

      /* open I/O area window */
      paddrbase = virt_to_phys((void*)CONFIG_CF_BASE_ADDR);
      psize = PAGE_SIZE;
      prot = PAGE_KERNEL_PCC(slot_no, _PAGE_PCC_IO16);
      cf_io_base = p3_ioremap(paddrbase, psize, prot.pgprot);
      if (!cf_io_base) {
            printk("allocate_cf_area : can't open CF I/O window!\n");
            return -ENOMEM;
      }
/*    printk("p3_ioremap(paddr=0x%08lx, psize=0x%08lx, prot=0x%08lx)=0x%08lx\n",
            paddrbase, psize, prot.pgprot, cf_io_base);*/

      /* XXX : do we need attribute and common-memory area also? */

      return 0;
}
#endif

static int __init cf_init_default(void)
{
/* You must have enabled the card, and set the level interrupt
 * before reaching this point. Possibly in boot ROM or boot loader.
 */
#if defined(CONFIG_CPU_SH4)
      allocate_cf_area();
#endif

      return 0;
}

#if defined(CONFIG_SH_SOLUTION_ENGINE)
#include <mach-se/mach/se.h>
#elif defined(CONFIG_SH_7722_SOLUTION_ENGINE)
#include <mach-se/mach/se7722.h>
#elif defined(CONFIG_SH_7721_SOLUTION_ENGINE)
#include <mach-se/mach/se7721.h>
#endif

/*
 * SolutionEngine Seriese
 *
 * about MS770xSE
 * 0xB8400000 : Common Memory
 * 0xB8500000 : Attribute
 * 0xB8600000 : I/O
 *
 * about MS7722SE
 * 0xB0400000 : Common Memory
 * 0xB0500000 : Attribute
 * 0xB0600000 : I/O
 */

#if defined(CONFIG_SH_SOLUTION_ENGINE) || \
    defined(CONFIG_SH_7722_SOLUTION_ENGINE) || \
    defined(CONFIG_SH_7721_SOLUTION_ENGINE)
static int __init cf_init_se(void)
{
      if ((ctrl_inw(MRSHPC_CSR) & 0x000c) != 0)
            return 0;   /* Not detected */

      if ((ctrl_inw(MRSHPC_CSR) & 0x0080) == 0) {
            ctrl_outw(0x0674, MRSHPC_CPWCR); /* Card Vcc is 3.3v? */
      } else {
            ctrl_outw(0x0678, MRSHPC_CPWCR); /* Card Vcc is 5V */
      }

      /*
       *  PC-Card window open
       *  flag == COMMON/ATTRIBUTE/IO
       */
      /* common window open */
      ctrl_outw(0x8a84, MRSHPC_MW0CR1);
      if((ctrl_inw(MRSHPC_CSR) & 0x4000) != 0)
            /* common mode & bus width 16bit SWAP = 1*/
            ctrl_outw(0x0b00, MRSHPC_MW0CR2);
      else
            /* common mode & bus width 16bit SWAP = 0*/
            ctrl_outw(0x0300, MRSHPC_MW0CR2);

      /* attribute window open */
      ctrl_outw(0x8a85, MRSHPC_MW1CR1);
      if ((ctrl_inw(MRSHPC_CSR) & 0x4000) != 0)
            /* attribute mode & bus width 16bit SWAP = 1*/
            ctrl_outw(0x0a00, MRSHPC_MW1CR2);
      else
            /* attribute mode & bus width 16bit SWAP = 0*/
            ctrl_outw(0x0200, MRSHPC_MW1CR2);

      /* I/O window open */
      ctrl_outw(0x8a86, MRSHPC_IOWCR1);
      ctrl_outw(0x0008, MRSHPC_CDCR);      /* I/O card mode */
      if ((ctrl_inw(MRSHPC_CSR) & 0x4000) != 0)
            ctrl_outw(0x0a00, MRSHPC_IOWCR2); /* bus width 16bit SWAP = 1*/
      else
            ctrl_outw(0x0200, MRSHPC_IOWCR2); /* bus width 16bit SWAP = 0*/

      ctrl_outw(0x2000, MRSHPC_ICR);
      ctrl_outb(0x00, PA_MRSHPC_MW2 + 0x206);
      ctrl_outb(0x42, PA_MRSHPC_MW2 + 0x200);
      return 0;
}
#else
static int __init cf_init_se(void)
{
      return -1;
}
#endif

static int __init cf_init(void)
{
      if (mach_is_se() || mach_is_7722se() || mach_is_7721se())
            return cf_init_se();

      return cf_init_default();
}

__initcall (cf_init);

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