Re: [PATCH] ide_cs: Make ide_cs work with the memory space of CF-Cards if IO space is not available (2nd revision)

Re: [PATCH] ide_cs: Make ide_cs work with the memory space of CF-Cards if IO space is not available (2nd revision)

[Thomas Kleffel (maintech GmbH)]

[-- Attachment #1: Type: text/plain, Size: 916 bytes --]

From: Thomas Kleffel <tk@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@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.

I made some changes based on the feedback from Alan Cox and Iain Barker.

The window size was changed from 16 to 0 (autodetect) on suggestion from 
Iain Barker. 16 didn't work with one of his cards.

Thomas



[-- Attachment #2: ide_cs.mem.patch --]
[-- Type: text/x-patch, Size: 4309 bytes --]

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 22:32:54.000000000 +0200
@@ -146,7 +146,16 @@ static void ide_detach(struct pcmcia_dev
     kfree(link->priv);
 } /* ide_detach */
 
-static int idecs_register(unsigned long io, unsigned long ctl, unsigned long irq, struct pcmcia_device *handle)
+static void idecs_mmio_fixup(ide_hwif_t *hwif)
+{
+	default_hwif_mmiops(hwif);
+	hwif->mmio = 2;
+	
+	ide_undecoded_slave(hwif);
+}
+
+static int idecs_register(unsigned long io, unsigned long ctl, 
+	unsigned long irq, struct pcmcia_device *handle, int is_mmio)
 {
     hw_regs_t hw;
     memset(&hw, 0, sizeof(hw));
@@ -154,7 +163,19 @@ static int idecs_register(unsigned long 
     hw.irq = irq;
     hw.chipset = ide_pci;
     hw.dev = &handle->dev;
-    return ide_register_hw_with_fixup(&hw, NULL, ide_undecoded_slave);
+    
+    if(is_mmio)
+    	return ide_register_hw_with_fixup(&hw, NULL, idecs_mmio_fixup);
+    else
+        return ide_register_hw_with_fixup(&hw, NULL, ide_undecoded_slave);
+}
+
+void outb_io(unsigned char value, unsigned long port) {
+	outb(value, port);
+}
+
+void outb_mem(unsigned char value, unsigned long port) {
+	writeb(value, (void __iomem *) port);
 }
 
 /*======================================================================
@@ -180,7 +201,8 @@ static int ide_config(struct pcmcia_devi
     } *stk = NULL;
     cistpl_cftable_entry_t *cfg;
     int i, pass, last_ret = 0, last_fn = 0, hd, is_kme = 0;
-    unsigned long io_base, ctl_base;
+    unsigned long io_base, ctl_base, is_mmio;
+    void (*my_outb)(unsigned char, unsigned long);
 
     DEBUG(0, "ide_config(0x%p)\n", link);
 
@@ -210,7 +232,7 @@ static int ide_config(struct pcmcia_devi
     /* Not sure if this is right... look up the current Vcc */
     CS_CHECK(GetConfigurationInfo, pcmcia_get_configuration_info(link, &stk->conf));
 
-    pass = io_base = ctl_base = 0;
+    pass = io_base = ctl_base = is_mmio = 0;
     tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
     tuple.Attributes = 0;
     CS_CHECK(GetFirstTuple, pcmcia_get_first_tuple(link, &tuple));
@@ -263,6 +285,33 @@ 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;
+	    
+	    if (mem->win[0].len < 16) 
+	    	goto next_entry;
+	    
+	    req.Attributes = WIN_DATA_WIDTH_16|WIN_MEMORY_TYPE_CM;
+	    req.Attributes |= WIN_ENABLE;
+	    req.Base = mem->win[0].host_addr;
+	    req.Size = 0;
+
+	    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;
+    	    is_mmio = 1;
+
+	    break;
+	}
+
     next_entry:
 	if (cfg->flags & CISTPL_CFTABLE_DEFAULT)
 	    memcpy(&stk->dflt, cfg, sizeof(stk->dflt));
@@ -277,22 +326,27 @@ static int ide_config(struct pcmcia_devi
 
     CS_CHECK(RequestIRQ, pcmcia_request_irq(link, &link->irq));
     CS_CHECK(RequestConfiguration, pcmcia_request_configuration(link, &link->conf));
+    
+    if(is_mmio) 
+    	my_outb = outb_mem;
+    else
+    	my_outb = outb_io;
 
     /* disable drive interrupts during IDE probe */
-    outb(0x02, ctl_base);
+    my_outb(0x02, ctl_base);
 
     /* special setup for KXLC005 card */
     if (is_kme)
-	outb(0x81, ctl_base+1);
+	my_outb(0x81, ctl_base+1);
 
     /* retry registration in case device is still spinning up */
     for (hd = -1, i = 0; i < 10; i++) {
-	hd = idecs_register(io_base, ctl_base, link->irq.AssignedIRQ, link);
+	hd = idecs_register(io_base, ctl_base, link->irq.AssignedIRQ, link, is_mmio);
 	if (hd >= 0) break;
 	if (link->io.NumPorts1 == 0x20) {
-	    outb(0x02, ctl_base + 0x10);
+	    my_outb(0x02, ctl_base + 0x10);
 	    hd = idecs_register(io_base + 0x10, ctl_base + 0x10,
-				link->irq.AssignedIRQ, link);
+				link->irq.AssignedIRQ, link, is_mmio);
 	    if (hd >= 0) {
 		io_base += 0x10;
 		ctl_base += 0x10;

Re: [PATCH] ide_cs: Make ide_cs work with the memory space of CF-Cards if IO space is not available (2nd revision)

[David Vrabel]

Thomas Kleffel (maintech GmbH) wrote:
> 
> +void outb_io(unsigned char value, unsigned long port) {
> +	outb(value, port);
> +}
> +
> +void outb_mem(unsigned char value, unsigned long port) {
> +	writeb(value, (void __iomem *) port);
>  }

[...]

> +    if(is_mmio) 
> +    	my_outb = outb_mem;
> +    else
> +    	my_outb = outb_io;


Shouldn't you convert ide_cs to use iowrite8 (and friends) instead of
doing this?

David Vrabel

Re: [PATCH] ide_cs: Make ide_cs work with the memory space of CF-Cards if IO space is not available (2nd revision)

[Thomas Kleffel (maintech GmbH)]

David Vrabel wrote:

>Thomas Kleffel (maintech GmbH) wrote:
>  
>
>>+void outb_io(unsigned char value, unsigned long port) {
>>+	outb(value, port);
>>+}
>>+
>>+void outb_mem(unsigned char value, unsigned long port) {
>>+	writeb(value, (void __iomem *) port);
>> }
>>    
>>
>
>[...]
>
>  
>
>>+    if(is_mmio) 
>>+    	my_outb = outb_mem;
>>+    else
>>+    	my_outb = outb_io;
>>    
>>
>
>
>Shouldn't you convert ide_cs to use iowrite8 (and friends) instead of
>doing this?
>  
>
You're right. I didn't know about iowrite8.

I'll post a new revision soon.

Thomas

RE: [PATCH] ide_cs: Make ide_cs work with the memory space of CF-Cards if IO space is not available (2nd revision)

[Iain Barker]

Thomas Kleffel (maintech GmbH) wrote:
> +    if(is_mmio) 
> +    	my_outb = outb_mem;
> +    else
> +    	my_outb = outb_io;

David Vrabel wrote:
> Shouldn't you convert ide_cs to use iowrite8 (and friends) instead of
> doing this?


Actually, I think even better to use the primitives from ide-iops.c ?

i.e. the members of default_hwif_iops and default_hwif_mmiops, which
map to the ide_mm_outb and ide_outb functions used by the rest of the
IDE driver code?

- Iain

Re: [PATCH] ide_cs: Make ide_cs work with the memory space of CF-Cards if IO space is not available (2nd revision)

[Thomas Kleffel (maintech GmbH)]

Hi,

>Thomas Kleffel (maintech GmbH) wrote:
>  
>
>>+    if(is_mmio) 
>>+    	my_outb = outb_mem;
>>+    else
>>+    	my_outb = outb_io;
>>    
>>
>
>David Vrabel wrote:
>  
>
>>Shouldn't you convert ide_cs to use iowrite8 (and friends) instead of
>>doing this?
>>    
>>
>
>
>Actually, I think even better to use the primitives from ide-iops.c ?
>  
>
They're declared static in ide-iops.c and I can't get them out of the 
ide_hwif_t struct as it is initialized after I need the primitives.

I think the simplest way is to use my own primitives.

Thomas