[PATCH] ide_cs: Make ide_cs work with the memory space of CF-Cards if IO space is not available

[Thomas Kleffel (maintech GmbH)]

From: Thomas Kleffel <tk at maintech.de>

this patch enables ide_cs to access CF-cards via their common memory 
rather than via their IO space.

Signed-off-by: Thomas Kleffel <tk at maintech.de>
---

This patch is against 2.6.17-rc3

The reason why this patch makes sense is that it is pretty easy to build 
a CF-Interface out of a simple address/data-bus if you only use common 
and attribute memory. Adding the capability to access IO space makes 
things more complicated.

If you just want to use CF-Storage cards, access to common and attribute 
memory is enough as the IDE registers are available there, as well.

I have submitted a patch to RMK which enables the AT91RM9200's CF 
interface to work in that mode.

diff -uprN l1/drivers/ide/legacy/ide-cs.c l2/drivers/ide/legacy/ide-cs.c
--- l1/drivers/ide/legacy/ide-cs.c      2006-05-11 00:19:59.000000000 +0200
+++ l2/drivers/ide/legacy/ide-cs.c      2006-05-11 03:38:03.000000000 +0200
@@ -263,6 +263,29 @@ static int ide_config(struct pcmcia_devi
            break;
        }

+       if ((cfg->mem.nwin > 0) || (stk->dflt.mem.nwin > 0)) {
+           win_req_t req;
+           memreq_t map;
+
+           cistpl_mem_t *mem = (cfg->mem.nwin) ? &cfg->mem : 
&stk->dflt.mem;
+           req.Attributes = WIN_DATA_WIDTH_16|WIN_MEMORY_TYPE_CM;
+           req.Attributes |= WIN_ENABLE;
+           req.Base = mem->win[0].host_addr;
+           req.Size = mem->win[0].len;
+
+           req.AccessSpeed = 0;
+           if (pcmcia_request_window(&link, &req, &link->win) != 0)
+               goto next_entry;
+           map.Page = 0; map.CardOffset = mem->win[0].card_addr;
+           if (pcmcia_map_mem_page(link->win, &map) != 0)
+               goto next_entry;
+
+           io_base = (unsigned long) ioremap(req.Base, req.Size);
+           ctl_base = io_base + 0x0e;
+
+           break;
+       }
+
     next_entry:
        if (cfg->flags & CISTPL_CFTABLE_DEFAULT)
            memcpy(&stk->dflt, cfg, sizeof(stk->dflt));