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authorJames Laird <jhl@mafipulation.org>2013-11-19 11:06:38 +1100
committerTejun Heo <tj@kernel.org>2013-11-23 08:34:34 -0500
commitcb85696d7277592ddbd2897db9a29f3ec6e9fe11 (patch)
tree021656b05ff51ae177992f83ba8042c7596124a8 /drivers/ata
parent462098b090897fbcf00088b225eb7a3adc407e98 (diff)
downloadlinux-cb85696d7277592ddbd2897db9a29f3ec6e9fe11.tar.bz2
ahci: mcp89: enter AHCI mode under Apple BIOS emulation
Apple's BIOS emulation forcibly disables MCP89 AHCI, eg. on Macbook7,1. We can re-enable it, replacing the previous workaround of using ata_generic. tj: whitespace adjustments, dropped inline from is_mcp89_apple() Signed-off-by: James Laird <jhl@mafipulation.org> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/ahci.c60
-rw-r--r--drivers/ata/ata_generic.c7
2 files changed, 51 insertions, 16 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index e2903d03180e..c55e00562527 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -83,6 +83,8 @@ enum board_ids {
static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline);
+static void ahci_mcp89_apple_enable(struct pci_dev *pdev);
+static bool is_mcp89_apple(struct pci_dev *pdev);
static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline);
#ifdef CONFIG_PM
@@ -659,6 +661,10 @@ static int ahci_pci_device_resume(struct pci_dev *pdev)
if (rc)
return rc;
+ /* Apple BIOS helpfully mangles the registers on resume */
+ if (is_mcp89_apple(pdev))
+ ahci_mcp89_apple_enable(pdev);
+
if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) {
rc = ahci_pci_reset_controller(host);
if (rc)
@@ -775,6 +781,48 @@ static void ahci_p5wdh_workaround(struct ata_host *host)
}
}
+/*
+ * Macbook7,1 firmware forcibly disables MCP89 AHCI and changes PCI ID when
+ * booting in BIOS compatibility mode. We restore the registers but not ID.
+ */
+static void ahci_mcp89_apple_enable(struct pci_dev *pdev)
+{
+ u32 val;
+
+ printk(KERN_INFO "ahci: enabling MCP89 AHCI mode\n");
+
+ pci_read_config_dword(pdev, 0xf8, &val);
+ val |= 1 << 0x1b;
+ /* the following changes the device ID, but appears not to affect function */
+ /* val = (val & ~0xf0000000) | 0x80000000; */
+ pci_write_config_dword(pdev, 0xf8, val);
+
+ pci_read_config_dword(pdev, 0x54c, &val);
+ val |= 1 << 0xc;
+ pci_write_config_dword(pdev, 0x54c, val);
+
+ pci_read_config_dword(pdev, 0x4a4, &val);
+ val &= 0xff;
+ val |= 0x01060100;
+ pci_write_config_dword(pdev, 0x4a4, val);
+
+ pci_read_config_dword(pdev, 0x54c, &val);
+ val &= ~(1 << 0xc);
+ pci_write_config_dword(pdev, 0x54c, val);
+
+ pci_read_config_dword(pdev, 0xf8, &val);
+ val &= ~(1 << 0x1b);
+ pci_write_config_dword(pdev, 0xf8, val);
+}
+
+static bool is_mcp89_apple(struct pci_dev *pdev)
+{
+ return pdev->vendor == PCI_VENDOR_ID_NVIDIA &&
+ pdev->device == PCI_DEVICE_ID_NVIDIA_NFORCE_MCP89_SATA &&
+ pdev->subsystem_vendor == PCI_VENDOR_ID_APPLE &&
+ pdev->subsystem_device == 0xcb89;
+}
+
/* only some SB600 ahci controllers can do 64bit DMA */
static bool ahci_sb600_enable_64bit(struct pci_dev *pdev)
{
@@ -1207,15 +1255,9 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
if (pdev->vendor == PCI_VENDOR_ID_MARVELL && !marvell_enable)
return -ENODEV;
- /*
- * For some reason, MCP89 on MacBook 7,1 doesn't work with
- * ahci, use ata_generic instead.
- */
- if (pdev->vendor == PCI_VENDOR_ID_NVIDIA &&
- pdev->device == PCI_DEVICE_ID_NVIDIA_NFORCE_MCP89_SATA &&
- pdev->subsystem_vendor == PCI_VENDOR_ID_APPLE &&
- pdev->subsystem_device == 0xcb89)
- return -ENODEV;
+ /* Apple BIOS on MCP89 prevents us using AHCI */
+ if (is_mcp89_apple(pdev))
+ ahci_mcp89_apple_enable(pdev);
/* Promise's PDC42819 is a SAS/SATA controller that has an AHCI mode.
* At the moment, we can only use the AHCI mode. Let the users know
diff --git a/drivers/ata/ata_generic.c b/drivers/ata/ata_generic.c
index f8f38a08abc5..7d196656adb5 100644
--- a/drivers/ata/ata_generic.c
+++ b/drivers/ata/ata_generic.c
@@ -221,13 +221,6 @@ static struct pci_device_id ata_generic[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_OPTI, PCI_DEVICE_ID_OPTI_82C558), },
{ PCI_DEVICE(PCI_VENDOR_ID_CENATEK,PCI_DEVICE_ID_CENATEK_IDE),
.driver_data = ATA_GEN_FORCE_DMA },
- /*
- * For some reason, MCP89 on MacBook 7,1 doesn't work with
- * ahci, use ata_generic instead.
- */
- { PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP89_SATA,
- PCI_VENDOR_ID_APPLE, 0xcb89,
- .driver_data = ATA_GEN_FORCE_DMA },
#if !defined(CONFIG_PATA_TOSHIBA) && !defined(CONFIG_PATA_TOSHIBA_MODULE)
{ PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_1), },
{ PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_2), },