sky2: pci power savings
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>
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 59cb9cd..c83406f 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -284,6 +284,86 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 = {