Date: Tue, 10 Jul 2012 18:13:22 -0400 From: Justin Hibbits <chmeeedalf@gmail.com> To: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: CFT: nVidia backlight driver Message-ID: <F63802D4-202C-4A2A-9AA7-7A1CCAF74780@gmail.com>
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Here's a backlight driver for those pbook/ibook/imac users with nVidia
chips. I've only tested it on Peter Grehan's PowerBook 12" (GeForce
FX Go5200), so it's not tested on anything else. It _shouldn't_ harm
the card, but don't blame me if it does :) I'd like to make sure it
does work on more than this machine before I commit it.
- Justin
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Index: sys/powerpc/conf/GENERIC64
===================================================================
--- sys/powerpc/conf/GENERIC64 (revision 238269)
+++ sys/powerpc/conf/GENERIC64 (working copy)
@@ -194,6 +194,7 @@
device powermac_nvram # Open Firmware configuration NVRAM
device smu # Apple System Management Unit
device atibl # ATI-based backlight driver for PowerBooks/iBooks
+device nvbl # nVidia-based backlight driver for PowerBooks/iBooks
# ADB support
device adb
Index: sys/powerpc/conf/GENERIC
===================================================================
--- sys/powerpc/conf/GENERIC (revision 238269)
+++ sys/powerpc/conf/GENERIC (working copy)
@@ -197,6 +197,7 @@
device smu # Apple System Management Unit
device windtunnel # Apple G4 MDD fan controller
device atibl # ATI-based backlight driver for PowerBooks/iBooks
+device nvbl # nVidia-based backlight driver for PowerBooks/iBooks
# ADB support
device adb
Index: sys/powerpc/powermac/nvbl.c
===================================================================
--- sys/powerpc/powermac/nvbl.c (revision 0)
+++ sys/powerpc/powermac/nvbl.c (working copy)
@@ -0,0 +1,209 @@
+/*-
+ * Copyright (c) 2012 Justin Hibbits
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: head/sys/powerpc/powermac/nvbl.c 232177 2012-02-26 13:45:25Z jhibbits $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/systm.h>
+#include <sys/module.h>
+#include <sys/kernel.h>
+#include <sys/rman.h>
+#include <sys/sysctl.h>
+
+#include <machine/bus.h>
+
+#include <dev/ofw/openfirm.h>
+
+#define NVIDIA_BRIGHT_MIN (0x0ec)
+#define NVIDIA_BRIGHT_MAX (0x538)
+#define NVIDIA_BRIGHT_SCALE ((NVIDIA_BRIGHT_MAX - NVIDIA_BRIGHT_MIN)/100)
+/* nVidia's MMIO registers are at PCI BAR[0] */
+#define NVIDIA_MMIO_REG (0x0)
+#define NVIDIA_MMIO_PMC (0x0)
+#define NVIDIA_PMC_OFF (NVIDIA_MMIO_PMC + 0x10f0)
+#define NVIDIA_PMC_BL_SHIFT (16)
+#define NVIDIA_PMC_BL_EN (1 << 31)
+#define NVIDIA_MMIO_PCRTC0 (0x00600000)
+#define NVIDIA_PCRTC0_BL (NVIDIA_MMIO_PCRTC0 + 0x081C)
+#define NVIDIA_PCRTC0_MASK (0xFFFFFFFC)
+#define NVIDIA_MMIO_PRAMDAC (0x00680000)
+#define NVIDIA_PRAMDAC_FPCTL (NVIDIA_MMIO_PRAMDAC + 0x0848)
+#define NVIDIA_FPCTL_MASK (0xCFFFFFCC)
+#define NVIDIA_PRAMDAC_NO_LEVEL (0x20000022)
+
+
+struct nvbl_softc {
+ device_t dev;
+ struct resource *sc_memr;
+ uint32_t sc_saved_ramdac;
+};
+
+static void nvbl_identify(driver_t *driver, device_t parent);
+static int nvbl_probe(device_t dev);
+static int nvbl_attach(device_t dev);
+static int nvbl_setlevel(struct nvbl_softc *sc, int newlevel);
+static int nvbl_getlevel(struct nvbl_softc *sc);
+static int nvbl_sysctl(SYSCTL_HANDLER_ARGS);
+
+static device_method_t nvbl_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_identify, nvbl_identify),
+ DEVMETHOD(device_probe, nvbl_probe),
+ DEVMETHOD(device_attach, nvbl_attach),
+ {0, 0},
+};
+
+static driver_t nvbl_driver = {
+ "backlight",
+ nvbl_methods,
+ sizeof(struct nvbl_softc)
+};
+
+static devclass_t nvbl_devclass;
+
+DRIVER_MODULE(nvbl, vgapci, nvbl_driver, nvbl_devclass, 0, 0);
+
+static void
+nvbl_identify(driver_t *driver, device_t parent)
+{
+ if (device_find_child(parent, "backlight", -1) == NULL)
+ device_add_child(parent, "backlight", -1);
+}
+
+static int
+nvbl_probe(device_t dev)
+{
+ char control[8];
+ phandle_t handle;
+
+ handle = OF_finddevice("mac-io/backlight");
+
+ if (handle <= 0)
+ return (ENXIO);
+
+ if (OF_getprop(handle, "backlight-control", &control, sizeof(control)) < 0)
+ return (ENXIO);
+
+ if (strcmp(control, "mnca") != 0)
+ return (ENXIO);
+
+ device_set_desc(dev, "PowerBook backlight for nVidia graphics");
+
+ return (0);
+}
+
+static int
+nvbl_attach(device_t dev)
+{
+ struct nvbl_softc *sc;
+ struct sysctl_ctx_list *ctx;
+ struct sysctl_oid *tree;
+ int rid;
+
+ sc = device_get_softc(dev);
+
+ rid = 0x10; /* BAR[0], for the MMIO register */
+ sc->sc_memr = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
+ RF_ACTIVE | RF_SHAREABLE);
+ if (sc->sc_memr == NULL) {
+ device_printf(dev, "Could not alloc mem resource!\n");
+ return (ENXIO);
+ }
+
+ sc->sc_saved_ramdac = bus_read_4(sc->sc_memr, NVIDIA_PRAMDAC_FPCTL) &
+ (~NVIDIA_FPCTL_MASK);
+
+ /* Turn on big-endian mode */
+ if (!(bus_read_stream_4(sc->sc_memr, NVIDIA_MMIO_PMC + 4) & 0x01000001)) {
+ bus_write_stream_4(sc->sc_memr, NVIDIA_MMIO_PMC + 4, 0x01000001);
+ mb();
+ }
+
+ ctx = device_get_sysctl_ctx(dev);
+ tree = device_get_sysctl_tree(dev);
+
+ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
+ "level", CTLTYPE_INT | CTLFLAG_RW, sc, 0,
+ nvbl_sysctl, "I", "Backlight level (0-100)");
+
+ return (0);
+}
+
+static int
+nvbl_setlevel(struct nvbl_softc *sc, int newlevel)
+{
+ uint32_t pmc_reg;
+
+ if (newlevel > 100)
+ newlevel = 100;
+
+ if (newlevel < 0)
+ newlevel = 0;
+
+ if (newlevel > 0)
+ newlevel = (newlevel * NVIDIA_BRIGHT_SCALE) + NVIDIA_BRIGHT_MIN;
+
+ pmc_reg = bus_read_stream_4(sc->sc_memr, NVIDIA_PMC_OFF) & 0xffff;
+ pmc_reg |= NVIDIA_PMC_BL_EN | (newlevel << NVIDIA_PMC_BL_SHIFT);
+ bus_write_stream_4(sc->sc_memr, NVIDIA_PMC_OFF, pmc_reg);
+
+ return (0);
+}
+
+static int
+nvbl_getlevel(struct nvbl_softc *sc)
+{
+ uint16_t level;
+
+ level = bus_read_stream_2(sc->sc_memr, NVIDIA_PMC_OFF) & 0x7fff;
+
+ if (level < NVIDIA_BRIGHT_MIN)
+ return 0;
+
+ level = (level - NVIDIA_BRIGHT_MIN) / NVIDIA_BRIGHT_SCALE;
+
+ return (level);
+}
+
+static int
+nvbl_sysctl(SYSCTL_HANDLER_ARGS)
+{
+ struct nvbl_softc *sc;
+ int newlevel, error;
+
+ sc = arg1;
+
+ newlevel = nvbl_getlevel(sc);
+
+ error = sysctl_handle_int(oidp, &newlevel, 0, req);
+
+ if (error || !req->newptr)
+ return (error);
+
+ return (nvbl_setlevel(sc, newlevel));
+}
Index: sys/conf/files.powerpc
===================================================================
--- sys/conf/files.powerpc (revision 238269)
+++ sys/conf/files.powerpc (working copy)
@@ -160,6 +160,7 @@
powerpc/powermac/kiic.c optional powermac kiic
powerpc/powermac/macgpio.c optional powermac pci
powerpc/powermac/macio.c optional powermac pci
+powerpc/powermac/nvbl.c optional powermac nvbl
powerpc/powermac/openpic_macio.c optional powermac pci
powerpc/powermac/platform_powermac.c optional powermac
powerpc/powermac/powermac_thermal.c optional powermac
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