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Add enable/disable hooks on devices that have ACPI power management 

capability, using D3 and D0 power states.  This saves me quite a bit
of battery when not using the built-in Ethernet on my IBM T-20 during
long IETF meetings.
This commit is contained in:
thorpej 2001-08-05 23:39:59 +00:00
parent e3d077542f
commit de108bd82d
1 changed files with 56 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
sys/dev/pci/if_fxp_pci.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: if_fxp_pci.c,v 1.18 2001/07/08 18:02:28 thorpej Exp $ */
/* $NetBSD: if_fxp_pci.c,v 1.19 2001/08/05 23:39:59 thorpej Exp $ */
/*-
* Copyright (c) 1997, 1998, 1999, 2000, 2001 The NetBSD Foundation, Inc.
@ -84,11 +84,17 @@ struct fxp_pci_softc {
pcireg_t psc_regs[0x20>>2]; /* saved PCI config regs (sparse) */
pcitag_t psc_tag; /* pci register tag */
void *psc_powerhook; /* power hook */
int psc_pwrmgmt_csr_reg; /* ACPI power management register */
pcireg_t psc_pwrmgmt_csr; /* ...and the contents at D0 */
};
int fxp_pci_match __P((struct device *, struct cfdata *, void *));
void fxp_pci_attach __P((struct device *, struct device *, void *));
int fxp_pci_enable __P((struct fxp_softc *));
void fxp_pci_disable __P((struct fxp_softc *));
static void fxp_pci_confreg_restore __P((struct fxp_pci_softc *psc));
static void fxp_pci_power __P((int why, void *arg));
@ -225,11 +231,7 @@ fxp_pci_attach(parent, self, aux)
bus_addr_t addr;
bus_size_t size;
int flags;
int pci_pwrmgmt_cap_reg, pci_pwrmgmt_csr_reg;
sc->sc_enabled = 1;
sc->sc_enable = NULL;
sc->sc_disable = NULL;
int pci_pwrmgmt_cap_reg;
/*
* Map control/status registers.
@ -387,17 +389,22 @@ fxp_pci_attach(parent, self, aux)
&pci_pwrmgmt_cap_reg, 0)) {
pcireg_t reg;
pci_pwrmgmt_csr_reg = pci_pwrmgmt_cap_reg + 4;
reg = pci_conf_read(pc, pa->pa_tag, pci_pwrmgmt_csr_reg);
if ((reg & PCI_PMCSR_STATE_MASK) != PCI_PMCSR_STATE_D0) {
pci_conf_write(pc, pa->pa_tag, pci_pwrmgmt_csr_reg,
(reg & ~PCI_PMCSR_STATE_MASK) |
PCI_PMCSR_STATE_D0);
}
sc->sc_enable = fxp_pci_enable;
sc->sc_disable = fxp_pci_disable;
psc->psc_pwrmgmt_csr_reg = pci_pwrmgmt_cap_reg + 4;
reg = pci_conf_read(pc, pa->pa_tag, psc->psc_pwrmgmt_csr_reg);
psc->psc_pwrmgmt_csr = (reg & ~PCI_PMCSR_STATE_MASK) |
PCI_PMCSR_STATE_D0;
if ((reg & PCI_PMCSR_STATE_MASK) != PCI_PMCSR_STATE_D0)
pci_conf_write(pc, pa->pa_tag, psc->psc_pwrmgmt_csr_reg,
psc->psc_pwrmgmt_csr);
}
/* Restore PCI configuration registers. */
fxp_pci_confreg_restore(psc);
sc->sc_enabled = 1;
/*
* Map and establish our interrupt.
*/
@ -419,11 +426,46 @@ fxp_pci_attach(parent, self, aux)
/* Finish off the attach. */
fxp_attach(sc);
if (sc->sc_disable != NULL)
fxp_disable(sc);
/* Add a suspend hook to restore PCI config state */
psc->psc_powerhook = powerhook_establish(fxp_pci_power, psc);
if (psc->psc_powerhook == NULL)
printf ("%s: WARNING: unable to establish pci power hook\n",
sc->sc_dev.dv_xname);
}
int
fxp_pci_enable(struct fxp_softc *sc)
{
struct fxp_pci_softc *psc = (void *) sc;
#if 0
printf("%s: going to power state D0\n", sc->sc_dev.dv_xname);
#endif
/* Bring the device into D0 power state. */
pci_conf_write(psc->psc_pc, psc->psc_tag,
psc->psc_pwrmgmt_csr_reg, psc->psc_pwrmgmt_csr);
/* Now restore the configuration registers. */
fxp_pci_confreg_restore(psc);
return (0);
}
void
fxp_pci_disable(struct fxp_softc *sc)
{
struct fxp_pci_softc *psc = (void *) sc;
#if 0
printf("%s: going to power state D3\n", sc->sc_dev.dv_xname);
#endif
/* Put the device into D3 state. */
pci_conf_write(psc->psc_pc, psc->psc_tag,
psc->psc_pwrmgmt_csr_reg, (psc->psc_pwrmgmt_csr &
~PCI_PMCSR_STATE_MASK) | PCI_PMCSR_STATE_D3);
}