linux-kernel - [PATCH] Add IDE mode support for SB600 SATA

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Message-ID: <FFECF24D2A7F6D418B9511AF6F3586020108CE7D@shacnexch2.atitech.com>
Date:	Thu, 23 Nov 2006 12:20:37 +0800
From:	"Conke Hu" <conke.hu@....com>
To:	<linux-kernel@...r.kernel.org>, <alan@...rguk.ukuu.org.uk>,
	"Andrew Morton" <akpm@...l.org>, "Jeff Garzik" <jeff@...zik.org>
Subject: [PATCH] Add IDE mode support for SB600 SATA


ATI SB600 SATA controller supports 4 modes: Legacy IDE, Native IDE, AHCI and RAID. Legacy/Native IDE mode is designed for compatibility with some old OS without AHCI driver but looses SATAII/AHCI features such as NCQ. This patch will make SB600 SATA run in AHCI mode even if it was set as IDE mode by system BIOS.

Signed-off-by: conke.hu@....com
---------
--- linux-2.6.19-rc6-git4/drivers/pci/quirks.c.orig	2006-11-23 19:45:49.000000000 +0800
+++ linux-2.6.19-rc6-git4/drivers/pci/quirks.c	2006-11-23 19:34:23.000000000 +0800
@@ -795,6 +795,25 @@ static void __init quirk_mediagx_master(
 	}
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_CYRIX,	PCI_DEVICE_ID_CYRIX_PCI_MASTER, quirk_mediagx_master );
+ 
+#if defined(CONFIG_SATA_AHCI) || defined(CONFIG_SATA_AHCI_MODULE)
+static void __devinit quirk_sb600_sata(struct pci_dev *pdev)
+{
+	/* set sb600 sata to ahci mode */
+	if ((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
+		u8 tmp;
+
+		pci_read_config_byte(pdev, 0x40, &tmp);
+		pci_write_config_byte(pdev, 0x40, tmp|1);
+		pci_write_config_byte(pdev, 0x9, 1);
+		pci_write_config_byte(pdev, 0xa, 6);
+		pci_write_config_byte(pdev, 0x40, tmp);
+		
+		pdev->class = 0x010601;
+	}
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP600_SATA, quirk_sb600_sata);
+#endif
 
 /*
  * As per PCI spec, ignore base address registers 0-3 of the IDE controllers


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