[Patch] Enable AHCI on certain ich chipsets

[Joerg Dorchain <joerg@dorchain.net>]

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Hello all,

Disclaimer: this patch is based on http://mjg59.livejournal.com/85504.html
It is in works-for-me state.

The patch to ahci.c is required for suspend/resume.

Signed-Off-By: joerg Dorchain <joerg@dorchain.net>

--- linux/drivers/pci/quirks.c.orig	2011-02-04 18:29:03.000000000 +0100
+++ linux/drivers/pci/quirks.c	2011-02-09 11:16:36.000000000 +0100
@@ -2684,6 +2684,79 @@
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_HINT, 0x0020, quirk_hotplug_bridge);
 
 /*
+ * Force ICH7/8/9 into AHCI mode.  This is needed because some
+ * BIOSes do not make AHCI-mode operation available to the user.
+ * As the Intel documentation states that the OS should not carry
+ * out the operation - the user must force this on the kernel
+ * commandline using quirk_ich_force_ahci
+ *
+ * As this quirk gets called whilst the PCI subsystem is
+ * walking the PCI bus, we declare this quirk against the LPC
+ * (device 00:1f.0), so that we can frob 00:1f.2 before the PCI
+ * code has scanned it.
+ * Note: the pci id might change due to this (e.g. from 27c4 to 27c5)
+ *
+ */
+
+static bool ich_force_ahci_mode = false;
+static bool ich_ahci_mode_forced = false;
+
+static int __init ich789_force_ahci_mode_setup(char *str)
+{
+	ich_force_ahci_mode = true;
+	return 0;
+}
+early_param("quirk_ich_force_ahci", ich789_force_ahci_mode_setup);
+
+static void ich789_force_ahci_mode(struct pci_dev *pdev)
+{
+        u8 amrval;
+        u8 sclkgc;
+        const int ich89_address_map_reg = 0x90;
+        const int ich89_sata_clock_gen_config_reg = 0x9c;
+        /* const u32 ich89_func_disable_reg_offset = 0x3418; */
+
+	if (!ich_force_ahci_mode)
+		return;
+
+        /* ICH8 datasheet section 12.1.33 */
+        if (!pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(PCI_SLOT(pdev->devfn), 2),
+                                ich89_address_map_reg, &amrval))
+{
+                if (amrval & (BIT(6) | BIT(7))) {
+                        dev_printk(KERN_DEBUG, &pdev->dev,
+                                        "ICH7/8/9 SATA controller not in IDE mode.  Not modifying.\n");
+                        return;
+                }
+                if (amrval & (BIT(0) | BIT(1)))
+                        dev_printk(KERN_DEBUG, &pdev->dev,
+                                        "ICH7/8/9 in SATA/PATA combined mode.  Untested.\n");
+                /* AHCI mode */
+                amrval |= BIT(6);
+                amrval &= ~BIT(7);
+                pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(PCI_SLOT(pdev->devfn), 2), 
+                                ich89_sata_clock_gen_config_reg, &sclkgc);
+                dev_printk(KERN_DEBUG, &pdev->dev, "sclkgc is %#0x\n", sclkgc);
+                pci_bus_write_config_byte(pdev->bus, PCI_DEVFN(PCI_SLOT(pdev->devfn), 2), 
+                                ich89_address_map_reg, amrval);
+                ich_ahci_mode_forced = true;
+                dev_printk(KERN_DEBUG, &pdev->dev, "Forced ICH7/8/9 mode PIIX->AHCI\n");
+        }
+
+}
+/* ICH7 */
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x27b9, ich789_force_ahci_mode);
+/* ICH8 */
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_0, ich789_force_ahci_mode);
+/* ICH9R LPC */
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x2916, ich789_force_ahci_mode);
+/* ICH9M LPC */
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x2917, ich789_force_ahci_mode);
+/* ICH9M-E LPC */
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x2919, ich789_force_ahci_mode);
+
+
+/*
  * This is a quirk for the Ricoh MMC controller found as a part of
  * some mulifunction chips.
 
--- linux/drivers/ata/ahci.c.orig	2011-02-04 18:13:33.000000000 +0100
+++ linux/drivers/ata/ahci.c	2011-02-04 18:23:41.000000000 +0100
@@ -640,6 +640,8 @@
 	struct ata_host *host = dev_get_drvdata(&pdev->dev);
 	int rc;
 
+	// override check to see if PCI config space is already restored in pci_restore_state
+	pdev->state_saved = true;
 	rc = ata_pci_device_do_resume(pdev);
 	if (rc)
 		return rc;

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