SD/MMC with db1100

SD/MMC with db1100

[Yasushi SHOJI]

Hello all,

I'm now tring SD subsystem on Au1100 with Syrah Rev 1.

Before porting handhelds.org's mmc driver, I just tried the attached
code, but it doesn't seems to work.

SD controler seems to emit right command to sd card, but there is no
response from sd card and timeouts.

Could someone enlighten me what's wrong with my code? or does anyone
successfully used sd/mmc on au1?

tia,
--
         yashi (leaving to Canada in a few hours...)



#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>

#include <asm/au1000.h>

MODULE_LICENSE("GPL");

int sd_init(void)
{
        u32 cpupll, sd;

        au_writel(0xffffffff, 0xb0600018); /* clear all status */

        /* just checking */
        cpupll = au_readl(0xb1900060) & 0x3f;
        sd = (au_readl(0xb190003c) & 0x3) + 2;
        printk("CPU PLL %d => CPU freq %dMHz\n", cpupll, 12 * cpupll);
        printk("System Bus clock Div %d => System Bus %dMHz\n",
               sd, 12 * cpupll / sd);
        printk("Peripheral clock is %dkHz\n",
               (12 * 1000) * cpupll / sd / 2);

        /* SD Enable Register */
        au_writel(0x1, 0xb060000c);      /* periperal rest: R */
        au_writel(0x3, 0xb060000c);      /* periperal reset and clock enable: R | CE */

        mdelay(1);

        /* SD Config Register */
        au_writel(0x3ff, 0xb0600008);    /* set slowest clock */

        printk("SD Clock is %dHz\n", (12 * 1000 * 1000) * cpupll / sd / 2 / (2*((0x1ff)+1)));

        /* SD Config Register 2*/
        au_writel(0x2, 0xb0600010);      /* FF(Force FIFO flush and reset) */
        au_writel(0x0, 0xb0600010);      /* clear FF */
        au_writel(0x1, 0xb0600010);      /* Enable serial interface state machine */

        /* SD Timeout Register */
        au_writel(0x1fffff, 0xb0600038); /* max timeout */

        /* CMD0 */
        au_writel(0x0, 0xb0600024);
        au_writel(0x1, 0xb0600020);

        while (!(au_readl(0xb0600018) & 0x10000))
                ;

        printk("Status Register %#x\n", au_readl(0xb0600018));
        au_writel(0x10000, 0xb0600018);
        printk("Status Register %#x\n", au_readl(0xb0600018));

        /* CMD1 */
        au_writel(0x0, 0xb0600024);
        au_writel(0x30101, 0xb0600020);  /* R3 | CMD1 | CT 0 | GO */
//        au_writel(0x0, 0xb0600024); /* ocr */
//        au_writel(0x32901, 0xb0600020);  /* R3 | CMD1 | CT 0 | GO */

        while (!(au_readl(0xb0600018) & 0x10000) &&
               !(au_readl(0xb0600018) & 0x20000))
                ;

        printk("Status Register %#x\n", au_readl(0xb0600018));

        printk("Response Register 0 %#x\n", au_readl(0xb0600034));
        printk("Response Register 1 %#x\n", au_readl(0xb0600030));
        printk("Response Register 2 %#x\n", au_readl(0xb060002c));
        printk("Response Register 3 %#x\n", au_readl(0xb0600028));

        mdelay(100);
        printk("Status Register %#x\n", au_readl(0xb0600018));

        return -1; /* too lazy to rmmod */
}

void sd_cleanup(void)
{
}

module_init(sd_init);
module_exit(sd_cleanup);

Re: SD/MMC with db1100

[Dan Malek]

Yasushi SHOJI wrote:

> Could someone enlighten me what's wrong with my code? or does anyone
> successfully used sd/mmc on au1?

There is a patch in Ralf's hands for the sd/mmc on this board.  If
it doesn't show up soon, we'll find a way to get it to you.


	-- Dan

Re: SD/MMC with db1100

[Pete Popov]

On Sun, 2003-08-24 at 18:01, Dan Malek wrote:
> Yasushi SHOJI wrote:
> 
> > Could someone enlighten me what's wrong with my code? or does anyone
> > successfully used sd/mmc on au1?
> 
> There is a patch in Ralf's hands for the sd/mmc on this board.  If
> it doesn't show up soon, we'll find a way to get it to you.

It's been there for a little while now -- a couple of weeks or so I
think.

ftp.linux-mips.org:/pub/linux/mips/people/ppopov/au1x_mmc.patch


Pete

Re: SD/MMC with db1100

[Yasushi SHOJI]

At 25 Aug 2003 09:16:15 -0700,
Pete Popov wrote:
> 
> On Sun, 2003-08-24 at 18:01, Dan Malek wrote:
> > Yasushi SHOJI wrote:
> > 
> > > Could someone enlighten me what's wrong with my code? or does anyone
> > > successfully used sd/mmc on au1?
> > 
> > There is a patch in Ralf's hands for the sd/mmc on this board.  If
> > it doesn't show up soon, we'll find a way to get it to you.
> 
> It's been there for a little while now -- a couple of weeks or so I
> think.
> 
> ftp.linux-mips.org:/pub/linux/mips/people/ppopov/au1x_mmc.patch

Thanks for the patch, Dan and Pete.

I just got back from vacation and tried the patch. The result was same
as what I tested with my code. My card doesn't respond to Command 1,
MMC_SEND_OP_COND.

The controller _seems_ sending the command on the data line; I checked
with logic analyzer.

I've been using Panasonic's SD card, RP-SD064B; and Hagiwara syscom's
MMC card, HB28D032MM2.

is there anything that I need to do use SD other than the patch?

thanks in advance,
--
       yashi