diff options
author | James Laird <jhl@mafipulation.org> | 2013-11-19 00:06:38 (GMT) |
---|---|---|
committer | Tejun Heo <tj@kernel.org> | 2013-11-23 13:34:34 (GMT) |
commit | cb85696d7277592ddbd2897db9a29f3ec6e9fe11 (patch) | |
tree | 021656b05ff51ae177992f83ba8042c7596124a8 /drivers/ata/ahci.c | |
parent | 462098b090897fbcf00088b225eb7a3adc407e98 (diff) | |
download | linux-cb85696d7277592ddbd2897db9a29f3ec6e9fe11.tar.xz |
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/ahci.c')
-rw-r--r-- | drivers/ata/ahci.c | 60 |
1 files changed, 51 insertions, 9 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index e2903d0..c55e005 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 |