Cleaned up AMD Au1200 IDE driver:

README for MIPS AU1XXX IDE driver - Released 2005-07-15

ABOUT

-----

This file describes the 'drivers/ide/mips/au1xxx-ide.c', related files and the

services they provide.

If you are short in patience and just want to know how to add your hard disc to

the white or black list, go to the 'ADD NEW HARD DISC TO WHITE OR BLACK LIST'

section.

LICENSE

-------

Copyright (c) 2003-2005 AMD, Personal Connectivity Solutions

This program is free software; you can redistribute it and/or modify it under

the terms of the GNU General Public License as published by the Free Software

Foundation; either version 2 of the License, or (at your option) any later

version.

THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,

INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR

BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

POSSIBILITY OF SUCH DAMAGE.

You should have received a copy of the GNU General Public License along with

this program; if not, write to the Free Software Foundation, Inc.,

675 Mass Ave, Cambridge, MA 02139, USA.

Note: for more information, please refer "AMD Alchemy Au1200/Au1550 IDE

      Interface and Linux Device Driver" Application Note.

FILES, CONFIGS AND COMPATABILITY

--------------------------------

Two files are introduced:

  a) 'include/asm-mips/mach-au1x00/au1xxx_ide.h'

     containes : struct _auide_hwif

                 struct drive_list_entry dma_white_list

                 struct drive_list_entry dma_black_list

                 timing parameters for PIO mode 0/1/2/3/4

                 timing parameters for MWDMA 0/1/2

  b) 'drivers/ide/mips/au1xxx-ide.c'

     contains the functionality of the AU1XXX IDE driver

Four configs variables are introduced:

  CONFIG_BLK_DEV_IDE_AU1XXX_PIO_DBDMA    - enable the PIO+DBDMA mode

  CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA  - enable the MWDMA mode

  CONFIG_BLK_DEV_IDE_AU1XXX_BURSTABLE_ON - set Burstable FIFO in DBDMA

                                           controler

  CONFIG_BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ - maximum transfer size

                                           per descriptor

If MWDMA is enabled and the connected hard disc is not on the white list, the

kernel switches to a "safe mwdma mode" at boot time. In this mode the IDE

performance is substantial slower then in full speed mwdma. In this case

please add your hard disc to the white list (follow instruction from 'ADD NEW

HARD DISC TO WHITE OR BLACK LIST' section).

SUPPORTED IDE MODES

-------------------

The AU1XXX IDE driver supported all PIO modes - PIO mode 0/1/2/3/4 - and all

MWDMA modes - MWDMA 0/1/2 -. There is no support for SWDMA and UDMA mode.

To change the PIO mode use the program hdparm with option -p, e.g.

'hdparm -p0 [device]' for PIO mode 0. To enable the MWDMA mode use the option

-X, e.g. 'hdparm -X32 [device]' for MWDMA mode 0.

PERFORMANCE CONFIGURATIONS

--------------------------

If the used system doesn't need USB support enable the following kernel configs:

CONFIG_IDE=y

CONFIG_BLK_DEV_IDE=y

CONFIG_IDE_GENERIC=y

CONFIG_BLK_DEV_IDEPCI=y

CONFIG_BLK_DEV_GENERIC=y

CONFIG_BLK_DEV_IDEDMA_PCI=y

CONFIG_IDEDMA_PCI_AUTO=y

CONFIG_BLK_DEV_IDE_AU1XXX=y

CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA=y

CONFIG_BLK_DEV_IDE_AU1XXX_BURSTABLE_ON=y

CONFIG_BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ=128

CONFIG_BLK_DEV_IDEDMA=y

CONFIG_IDEDMA_AUTO=y

If the used system need the USB support enable the following kernel configs for

high IDE to USB throughput.

CONFIG_BLK_DEV_IDEDISK=y

CONFIG_IDE_GENERIC=y

CONFIG_BLK_DEV_IDEPCI=y

CONFIG_BLK_DEV_GENERIC=y

CONFIG_BLK_DEV_IDEDMA_PCI=y

CONFIG_IDEDMA_PCI_AUTO=y

CONFIG_BLK_DEV_IDE_AU1XXX=y

CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA=y

CONFIG_BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ=128

CONFIG_BLK_DEV_IDEDMA=y

CONFIG_IDEDMA_AUTO=y

ADD NEW HARD DISC TO WHITE OR BLACK LIST

----------------------------------------

Step 1 : detect the model name of your hard disc

  a) connect your hard disc to the AU1XXX

  b) boot your kernel and get the hard disc model.

     Example boot log:

     --snipped--

     Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2

     ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx

     Au1xxx IDE(builtin) configured for MWDMA2

     Probing IDE interface ide0...

     hda: Maxtor 6E040L0, ATA DISK drive

     ide0 at 0xac800000-0xac800007,0xac8001c0 on irq 64

     hda: max request size: 64KiB

     hda: 80293248 sectors (41110 MB) w/2048KiB Cache, CHS=65535/16/63, (U)DMA

     --snipped--

     In this example 'Maxtor 6E040L0'.

Step  2 : edit 'include/asm-mips/mach-au1x00/au1xxx_ide.h'

  Add your hard disc to the dma_white_list or dma_black_list structur.

Step 3 : Recompile the kernel

  Enable MWDMA support in the kernel configuration. Recompile the kernel and

  reboot.

Step 4 : Tests

  If you have add a hard disc to the white list, please run some stress tests

  for verification.

ACKNOWLEDGMENTS

---------------

These drivers wouldn't have been done without the base of kernel 2.4.x AU1XXX

IDE driver from AMD.

Additional input also from:

Matthias Lenk <matthias.lenk@amd.com>

Happy hacking!

Enrico Walther <enrico.walther@amd.com>

config MIPS_DB1200

	bool "AMD Alchemy DB1200 board"

	select SOC_AU1200

	select DMA_NONCOHERENT

	select DMA_COHERENT

	select MIPS_DISABLE_OBSOLETE_IDE

	select SYS_SUPPORTS_LITTLE_ENDIAN

	return NULL;

}

void * au1xxx_ddma_get_nextptr_virt(au1x_ddma_desc_t *dp)

{

        return phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr));

}

EXPORT_SYMBOL(au1xxx_ddma_get_nextptr_virt);

u32

au1xxx_ddma_add_device(dbdev_tab_t *dev)

{

#include <linux/init.h>

#include <linux/resource.h>

#include <asm/mach-au1x00/au1000.h>

#include <asm/mach-au1x00/au1xxx.h>

/* OHCI (USB full speed host controller) */

static struct resource au1xxx_usb_ohci_resources[] = {

	.resource	= au1xxx_usb_otg_resources,

};

/*** AU1200 LCD controller ***/

static struct resource au1200_lcd_resources[] = {

	[0] = {

		.start          = LCD_PHYS_ADDR,

	}

};

static struct resource au1200_ide0_resources[] = {

	[0] = {

		.start		= AU1XXX_ATA_PHYS_ADDR,

		.end 		= AU1XXX_ATA_PHYS_ADDR + AU1XXX_ATA_PHYS_LEN,

		.flags		= IORESOURCE_MEM,

	},

	[1] = {

		.start		= AU1XXX_ATA_INT,

		.end		= AU1XXX_ATA_INT,

		.flags		= IORESOURCE_IRQ,

	}

};

static u64 au1200_lcd_dmamask = ~(u32)0;

static struct platform_device au1200_lcd_device = {

	.num_resources  = ARRAY_SIZE(au1200_lcd_resources),

	.resource       = au1200_lcd_resources,

};

static u64 ide0_dmamask = ~(u32)0;

static struct platform_device au1200_ide0_device = {

	.name		= "au1200-ide",

	.id		= 0,

	.dev = {

		.dma_mask 		= &ide0_dmamask,

		.coherent_dma_mask	= 0xffffffff,

	},

	.num_resources = ARRAY_SIZE(au1200_ide0_resources),

	.resource	= au1200_ide0_resources,

};

#endif

static struct platform_device *au1xxx_platform_devices[] __initdata = {

	&au1xxx_usb_gdt_device,

	&au1xxx_usb_otg_device,

	&au1200_lcd_device,

	&au1200_ide0_device,

#endif

};

 *  with this program; if not, write  to the Free Software Foundation, Inc.,

 *  675 Mass Ave, Cambridge, MA 02139, USA.

 */

#include <linux/config.h>

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/irq.h>

 */

static volatile int pb1200_cascade_en=0;

void pb1200_cascade_handler( int irq, void *dev_id, struct pt_regs *regs)

irqreturn_t pb1200_cascade_handler( int irq, void *dev_id, struct pt_regs *regs)

{

	unsigned short bisr = bcsr->int_status;

	int extirq_nr = 0;

		/* Ack and dispatch IRQ */

		do_IRQ(extirq_nr,regs);

	}

	return IRQ_RETVAL(1);

}

inline void pb1200_enable_irq(unsigned int irq_nr)

	if (++pb1200_cascade_en == 1)

	{

		request_irq(AU1000_GPIO_7, &pb1200_cascade_handler,

			0, "Pb1200 Cascade", &pb1200_cascade_handler );

			0, "Pb1200 Cascade", (void *)&pb1200_cascade_handler );

#ifdef CONFIG_MIPS_PB1200

    /* We have a problem with CPLD rev3. Enable a workaround */

	if( ((bcsr->whoami & BCSR_WHOAMI_CPLD)>>4) <= 3)