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[PATCH] e1000: Added functions to save and restore config

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These functions help restore the driver to active configuration when coming out of resume for power management.

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Jesse Brandeburg 2006-01-18 13:01:34 -08:00 committed by Jeff Garzik
parent b92ff8ee57
commit 2f82665fe5
1 changed files with 58 additions and 2 deletions
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60
drivers/net/e1000/e1000_main.c
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@ -4437,6 +4437,54 @@ e1000_set_spd_dplx(struct e1000_adapter *adapter, uint16_t spddplx)
}
#ifdef CONFIG_PM
/* these functions save and restore 16 or 64 dwords (64-256 bytes) of config
* space versus the 64 bytes that pci_[save|restore]_state handle
*/
#define PCIE_CONFIG_SPACE_LEN 256
#define PCI_CONFIG_SPACE_LEN 64
static int
e1000_pci_save_state(struct e1000_adapter *adapter)
{
struct pci_dev *dev = adapter->pdev;
int size;
int i;
if (adapter->hw.mac_type >= e1000_82571)
size = PCIE_CONFIG_SPACE_LEN;
else
size = PCI_CONFIG_SPACE_LEN;
WARN_ON(adapter->config_space != NULL);
adapter->config_space = kmalloc(size, GFP_KERNEL);
if (!adapter->config_space) {
DPRINTK(PROBE, ERR, "unable to allocate %d bytes\n", size);
return -ENOMEM;
}
for (i = 0; i < (size / 4); i++)
pci_read_config_dword(dev, i * 4, &adapter->config_space[i]);
return 0;
}
static void
e1000_pci_restore_state(struct e1000_adapter *adapter)
{
struct pci_dev *dev = adapter->pdev;
int size;
int i;
if (adapter->config_space == NULL)
return;
if (adapter->hw.mac_type >= e1000_82571)
size = PCIE_CONFIG_SPACE_LEN;
else
size = PCI_CONFIG_SPACE_LEN;
for (i = 0; i < (size / 4); i++)
pci_write_config_dword(dev, i * 4, adapter->config_space[i]);
kfree(adapter->config_space);
adapter->config_space = NULL;
return;
}
#endif /* CONFIG_PM */
static int
e1000_suspend(struct pci_dev *pdev, pm_message_t state)
{
@ -4451,6 +4499,14 @@ e1000_suspend(struct pci_dev *pdev, pm_message_t state)
if(netif_running(netdev))
e1000_down(adapter);
#ifdef CONFIG_PM
/* implement our own version of pci_save_state(pdev) because pci
* express adapters have larger 256 byte config spaces */
retval = e1000_pci_save_state(adapter);
if (retval)
return retval;
#endif
status = E1000_READ_REG(&adapter->hw, STATUS);
if(status & E1000_STATUS_LU)
wufc &= ~E1000_WUFC_LNKC;
@ -4507,8 +4563,6 @@ e1000_suspend(struct pci_dev *pdev, pm_message_t state)
DPRINTK(PROBE, ERR, "Error enabling D3 cold wake\n");
}
pci_save_state(pdev);
if(adapter->hw.mac_type >= e1000_82540 &&
adapter->hw.media_type == e1000_media_type_copper) {
manc = E1000_READ_REG(&adapter->hw, MANC);
@ -4537,6 +4591,7 @@ e1000_suspend(struct pci_dev *pdev, pm_message_t state)
return 0;
}
#ifdef CONFIG_PM
static int
e1000_resume(struct pci_dev *pdev)
{
@ -4548,6 +4603,7 @@ e1000_resume(struct pci_dev *pdev)
retval = pci_set_power_state(pdev, PCI_D0);
if (retval)
DPRINTK(PROBE, ERR, "Error in setting power state\n");
e1000_pci_restore_state(adapter);
ret_val = pci_enable_device(pdev);
pci_set_master(pdev);