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[PowerPC] De-giant powermac_nvram, update documentation
* Remove the giant lock requirement from powermac_nvram. * Update manual pages to reflect current state. Reviewed by: bcr (manpages), jhibbits Sponsored by: Tag1 Consulting, Inc. Differential Revision: https://reviews.freebsd.org/D24812
This commit is contained in:
Brandon Bergren
parent
188aee740f
commit
37f530582d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=362406
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@ -25,7 +25,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd September 5, 2010
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.Dd June 19, 2020
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.Dt POWERMAC_NVRAM 4 powerpc
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.Os
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.Sh NAME
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@ -50,8 +50,10 @@ The
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.Nm
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driver provides access to the Open Firmware configuration NVRAM
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available on the Apple PowerPC-based machines.
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.Pp
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This driver currently supports "Core99" machines containing a Sharp, Micron,
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or AMD NVRAM.
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.Sh SEE ALSO
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.Xr eeprom 8 ,
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.Xr nvram 8
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.Sh HISTORY
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The
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@ -34,6 +34,8 @@
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/sx.h>
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#include <sys/uio.h>
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#include <dev/ofw/openfirm.h>
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@ -99,7 +101,6 @@ static d_write_t powermac_nvram_write;
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static struct cdevsw powermac_nvram_cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_NEEDGIANT,
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.d_open = powermac_nvram_open,
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.d_close = powermac_nvram_close,
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.d_read = powermac_nvram_read,
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@ -180,6 +181,8 @@ powermac_nvram_attach(device_t dev)
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"powermac_nvram");
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sc->sc_cdev->si_drv1 = sc;
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sx_init(&sc->sc_lock, "powermac_nvram");
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return 0;
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}
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@ -195,6 +198,8 @@ powermac_nvram_detach(device_t dev)
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if (sc->sc_cdev != NULL)
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destroy_dev(sc->sc_cdev);
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sx_destroy(&sc->sc_lock);
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return 0;
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}
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@ -203,11 +208,17 @@ static int
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powermac_nvram_open(struct cdev *dev, int flags, int fmt, struct thread *td)
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{
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struct powermac_nvram_softc *sc = dev->si_drv1;
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int err;
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err = 0;
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sx_xlock(&sc->sc_lock);
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if (sc->sc_isopen)
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return EBUSY;
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sc->sc_isopen = 1;
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err = EBUSY;
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else
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sc->sc_isopen = 1;
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sc->sc_rpos = sc->sc_wpos = 0;
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sx_xunlock(&sc->sc_lock);
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return 0;
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}
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@ -218,10 +229,12 @@ powermac_nvram_close(struct cdev *dev, int fflag, int devtype, struct thread *td
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struct core99_header *header;
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vm_offset_t bank;
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sx_xlock(&sc->sc_lock);
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if (sc->sc_wpos != sizeof(sc->sc_data)) {
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/* Short write, restore in-memory copy */
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bcopy((void *)sc->sc_bank, (void *)sc->sc_data, NVRAM_SIZE);
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sc->sc_isopen = 0;
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sx_xunlock(&sc->sc_lock);
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return 0;
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}
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@ -242,10 +255,12 @@ powermac_nvram_close(struct cdev *dev, int fflag, int devtype, struct thread *td
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if (erase_bank(sc->sc_dev, (uint8_t *)bank) != 0 ||
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write_bank(sc->sc_dev, (uint8_t *)bank, sc->sc_data) != 0) {
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sc->sc_isopen = 0;
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sx_xunlock(&sc->sc_lock);
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return ENOSPC;
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}
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sc->sc_bank = bank;
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sc->sc_isopen = 0;
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sx_xunlock(&sc->sc_lock);
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return 0;
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}
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@ -256,6 +271,8 @@ powermac_nvram_read(struct cdev *dev, struct uio *uio, int ioflag)
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struct powermac_nvram_softc *sc = dev->si_drv1;
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rv = 0;
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sx_xlock(&sc->sc_lock);
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while (uio->uio_resid > 0) {
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data_available = sizeof(sc->sc_data) - sc->sc_rpos;
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if (data_available > 0) {
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@ -269,6 +286,8 @@ powermac_nvram_read(struct cdev *dev, struct uio *uio, int ioflag)
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break;
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}
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}
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sx_xunlock(&sc->sc_lock);
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return rv;
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}
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@ -282,6 +301,8 @@ powermac_nvram_write(struct cdev *dev, struct uio *uio, int ioflag)
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return EINVAL;
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rv = 0;
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sx_xlock(&sc->sc_lock);
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while (uio->uio_resid > 0) {
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data_available = sizeof(sc->sc_data) - sc->sc_wpos;
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if (data_available > 0) {
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@ -295,6 +316,8 @@ powermac_nvram_write(struct cdev *dev, struct uio *uio, int ioflag)
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break;
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}
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}
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sx_xunlock(&sc->sc_lock);
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return rv;
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}
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@ -500,6 +523,8 @@ erase_bank(device_t dev, uint8_t *bank)
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struct powermac_nvram_softc *sc;
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sc = device_get_softc(dev);
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sx_assert(&sc->sc_lock, SA_XLOCKED);
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if (sc->sc_type == FLASH_TYPE_AMD)
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return (erase_bank_amd(dev, bank));
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else
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@ -512,6 +537,8 @@ write_bank(device_t dev, uint8_t *bank, uint8_t *data)
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struct powermac_nvram_softc *sc;
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sc = device_get_softc(dev);
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sx_assert(&sc->sc_lock, SA_XLOCKED);
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if (sc->sc_type == FLASH_TYPE_AMD)
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return (write_bank_amd(dev, bank, data));
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else
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@ -49,6 +49,7 @@
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struct powermac_nvram_softc {
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device_t sc_dev;
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struct sx sc_lock;
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phandle_t sc_node;
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vm_offset_t sc_bank;
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vm_offset_t sc_bank0;
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@ -25,7 +25,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 1, 2006
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.Dd June 19, 2020
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.Dt NVRAM 8 powerpc
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.Os
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.Sh NAME
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@ -98,8 +98,7 @@ to
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.Pp
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.Dl "nvram -d foo -d bar baz=100"
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.Sh SEE ALSO
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.Xr powermac_nvram 4 ,
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.Xr eeprom 8
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.Xr powermac_nvram 4
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.Sh HISTORY
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The
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.Nm
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@ -111,8 +110,3 @@ Darwin/Mac OS X
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utility.
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.Sh AUTHORS
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.An Maxim Sobolev Aq Mt sobomax@FreeBSD.org
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.Sh BUGS
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Currently,
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.Nm
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only supports systems equipped with AMD flash and is only tested on Apple
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G4-based Mac Mini machines.
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