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sky2: pci power savings

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Turn on special bits to save more power when device is shutdown.
Tested on a limited range of hardware, some of the bits are for hardware
that probably isn't even in production (like Yukon Supreme) and was ported
from the vendor driver.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Stephen Hemminger
2008-05-14 17:04:17 -07:00
committed by Jeff Garzik
parent db99b98885
commit a068c0adf2
2 changed files with 107 additions and 7 deletions
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98
drivers/net/sky2.c
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@@ -284,6 +284,86 @@ static void sky2_power_aux(struct sky2_hw *hw)
PC_VAUX_ON | PC_VCC_OFF));
}
static void sky2_power_state(struct sky2_hw *hw, pci_power_t state)
{
u16 power_control = sky2_pci_read16(hw, hw->pm_cap + PCI_PM_CTRL);
int pex = pci_find_capability(hw->pdev, PCI_CAP_ID_EXP);
u32 reg;
sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_ON);
switch (state) {
case PCI_D0:
break;
case PCI_D1:
power_control |= 1;
break;
case PCI_D2:
power_control |= 2;
break;
case PCI_D3hot:
case PCI_D3cold:
power_control |= 3;
if (hw->flags & SKY2_HW_ADV_POWER_CTL) {
/* additional power saving measurements */
reg = sky2_pci_read32(hw, PCI_DEV_REG4);
/* set gating core clock for LTSSM in L1 state */
reg |= P_PEX_LTSSM_STAT(P_PEX_LTSSM_L1_STAT) |
/* auto clock gated scheme controlled by CLKREQ */
P_ASPM_A1_MODE_SELECT |
/* enable Gate Root Core Clock */
P_CLK_GATE_ROOT_COR_ENA;
if (pex && (hw->flags & SKY2_HW_CLK_POWER)) {
/* enable Clock Power Management (CLKREQ) */
u16 ctrl = sky2_pci_read16(hw, pex + PCI_EXP_DEVCTL);
ctrl |= PCI_EXP_DEVCTL_AUX_PME;
sky2_pci_write16(hw, pex + PCI_EXP_DEVCTL, ctrl);
} else
/* force CLKREQ Enable in Our4 (A1b only) */
reg |= P_ASPM_FORCE_CLKREQ_ENA;
/* set Mask Register for Release/Gate Clock */
sky2_pci_write32(hw, PCI_DEV_REG5,
P_REL_PCIE_EXIT_L1_ST | P_GAT_PCIE_ENTER_L1_ST |
P_REL_PCIE_RX_EX_IDLE | P_GAT_PCIE_RX_EL_IDLE |
P_REL_GPHY_LINK_UP | P_GAT_GPHY_LINK_DOWN);
} else
sky2_write8(hw, B28_Y2_ASF_STAT_CMD, Y2_ASF_CLK_HALT);
/* put CPU into reset state */
sky2_write8(hw, B28_Y2_ASF_STAT_CMD, HCU_CCSR_ASF_RESET);
if (hw->chip_id == CHIP_ID_YUKON_SUPR && hw->chip_rev == CHIP_REV_YU_SU_A0)
/* put CPU into halt state */
sky2_write8(hw, B28_Y2_ASF_STAT_CMD, HCU_CCSR_ASF_HALTED);
if (pex && !(hw->flags & SKY2_HW_RAM_BUFFER)) {
reg = sky2_pci_read32(hw, PCI_DEV_REG1);
/* force to PCIe L1 */
reg |= PCI_FORCE_PEX_L1;
sky2_pci_write32(hw, PCI_DEV_REG1, reg);
}
break;
default:
dev_warn(&hw->pdev->dev, PFX "Invalid power state (%d) ",
state);
return;
}
power_control |= PCI_PM_CTRL_PME_ENABLE;
/* Finally, set the new power state. */
sky2_pci_write32(hw, hw->pm_cap + PCI_PM_CTRL, power_control);
sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);
sky2_pci_read32(hw, B0_CTST);
}
static void sky2_gmac_reset(struct sky2_hw *hw, unsigned port)
{
u16 reg;
@@ -2786,6 +2866,10 @@ static int __devinit sky2_init(struct sky2_hw *hw)
hw->flags = SKY2_HW_GIGABIT
| SKY2_HW_NEWER_PHY
| SKY2_HW_ADV_POWER_CTL;
/* check for Rev. A1 dev 4200 */
if (sky2_read16(hw, Q_ADDR(Q_XA1, Q_WM)) == 0)
hw->flags |= SKY2_HW_CLK_POWER;
break;
case CHIP_ID_YUKON_EX:
@@ -2836,6 +2920,11 @@ static int __devinit sky2_init(struct sky2_hw *hw)
if (hw->pmd_type == 'L' || hw->pmd_type == 'S' || hw->pmd_type == 'P')
hw->flags |= SKY2_HW_FIBRE_PHY;
hw->pm_cap = pci_find_capability(hw->pdev, PCI_CAP_ID_PM);
if (hw->pm_cap == 0) {
dev_err(&hw->pdev->dev, "cannot find PowerManagement capability\n");
return -EIO;
}
hw->ports = 1;
t8 = sky2_read8(hw, B2_Y2_HW_RES);
@@ -4407,7 +4496,7 @@ static int sky2_suspend(struct pci_dev *pdev, pm_message_t state)
pci_save_state(pdev);
pci_enable_wake(pdev, pci_choose_state(pdev, state), wol);
pci_set_power_state(pdev, pci_choose_state(pdev, state));
sky2_power_state(hw, pci_choose_state(pdev, state));
return 0;
}
@@ -4420,9 +4509,7 @@ static int sky2_resume(struct pci_dev *pdev)
if (!hw)
return 0;
err = pci_set_power_state(pdev, PCI_D0);
if (err)
goto out;
sky2_power_state(hw, PCI_D0);
err = pci_restore_state(pdev);
if (err)
@@ -4490,8 +4577,7 @@ static void sky2_shutdown(struct pci_dev *pdev)
pci_enable_wake(pdev, PCI_D3cold, wol);
pci_disable_device(pdev);
pci_set_power_state(pdev, PCI_D3hot);
sky2_power_state(hw, PCI_D3hot);
}
static struct pci_driver sky2_driver = {