2 * Copyright (c) 2012 Justin Hibbits
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
21 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
22 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/module.h>
34 #include <sys/kernel.h>
36 #include <sys/sysctl.h>
38 #include <machine/bus.h>
40 #include <dev/ofw/openfirm.h>
42 /* From the xf86-video-ati driver's radeon_reg.h */
43 #define RADEON_LVDS_GEN_CNTL 0x02d0
44 #define RADEON_LVDS_ON (1 << 0)
45 #define RADEON_LVDS_DISPLAY_DIS (1 << 1)
46 #define RADEON_LVDS_PANEL_TYPE (1 << 2)
47 #define RADEON_LVDS_PANEL_FORMAT (1 << 3)
48 #define RADEON_LVDS_RST_FM (1 << 6)
49 #define RADEON_LVDS_EN (1 << 7)
50 #define RADEON_LVDS_BL_MOD_LEVEL_SHIFT 8
51 #define RADEON_LVDS_BL_MOD_LEVEL_MASK (0xff << 8)
52 #define RADEON_LVDS_BL_MOD_EN (1 << 16)
53 #define RADEON_LVDS_DIGON (1 << 18)
54 #define RADEON_LVDS_BLON (1 << 19)
55 #define RADEON_LVDS_PLL_CNTL 0x02d4
56 #define RADEON_LVDS_PLL_EN (1 << 16)
57 #define RADEON_LVDS_PLL_RESET (1 << 17)
58 #define RADEON_PIXCLKS_CNTL 0x002d
59 #define RADEON_PIXCLK_LVDS_ALWAYS_ONb (1 << 14)
60 #define RADEON_DISP_PWR_MAN 0x0d08
61 #define RADEON_AUTO_PWRUP_EN (1 << 26)
62 #define RADEON_CLOCK_CNTL_DATA 0x000c
63 #define RADEON_CLOCK_CNTL_INDEX 0x0008
64 #define RADEON_PLL_WR_EN (1 << 7)
65 #define RADEON_CRTC_GEN_CNTL 0x0050
68 struct resource *sc_memr;
72 static void atibl_identify(driver_t *driver, device_t parent);
73 static int atibl_probe(device_t dev);
74 static int atibl_attach(device_t dev);
75 static int atibl_setlevel(struct atibl_softc *sc, int newlevel);
76 static int atibl_getlevel(struct atibl_softc *sc);
77 static int atibl_resume(device_t dev);
78 static int atibl_suspend(device_t dev);
79 static int atibl_sysctl(SYSCTL_HANDLER_ARGS);
81 static device_method_t atibl_methods[] = {
82 /* Device interface */
83 DEVMETHOD(device_identify, atibl_identify),
84 DEVMETHOD(device_probe, atibl_probe),
85 DEVMETHOD(device_attach, atibl_attach),
86 DEVMETHOD(device_suspend, atibl_suspend),
87 DEVMETHOD(device_resume, atibl_resume),
91 static driver_t atibl_driver = {
94 sizeof(struct atibl_softc)
97 static devclass_t atibl_devclass;
99 DRIVER_MODULE(atibl, vgapci, atibl_driver, atibl_devclass, 0, 0);
102 atibl_identify(driver_t *driver, device_t parent)
104 if (OF_finddevice("mac-io/backlight") == -1)
106 if (device_find_child(parent, "backlight", -1) == NULL)
107 device_add_child(parent, "backlight", -1);
111 atibl_probe(device_t dev)
116 handle = OF_finddevice("mac-io/backlight");
121 if (OF_getprop(handle, "backlight-control", &control, sizeof(control)) < 0)
124 if (strcmp(control, "ati") != 0)
127 device_set_desc(dev, "PowerBook backlight for ATI graphics");
133 atibl_attach(device_t dev)
135 struct atibl_softc *sc;
136 struct sysctl_ctx_list *ctx;
137 struct sysctl_oid *tree;
140 sc = device_get_softc(dev);
142 rid = 0x18; /* BAR[2], for the MMIO register */
143 sc->sc_memr = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
144 RF_ACTIVE | RF_SHAREABLE);
145 if (sc->sc_memr == NULL) {
146 device_printf(dev, "Could not alloc mem resource!\n");
150 ctx = device_get_sysctl_ctx(dev);
151 tree = device_get_sysctl_tree(dev);
153 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
154 "level", CTLTYPE_INT | CTLFLAG_RW, sc, 0,
155 atibl_sysctl, "I", "Backlight level (0-100)");
160 static uint32_t __inline
161 atibl_pll_rreg(struct atibl_softc *sc, uint32_t reg)
163 uint32_t data, save, tmp;
165 bus_write_1(sc->sc_memr, RADEON_CLOCK_CNTL_INDEX,
166 ((reg & 0x3f) | RADEON_PLL_WR_EN));
167 (void)bus_read_4(sc->sc_memr, RADEON_CLOCK_CNTL_DATA);
168 (void)bus_read_4(sc->sc_memr, RADEON_CRTC_GEN_CNTL);
170 data = bus_read_4(sc->sc_memr, RADEON_CLOCK_CNTL_DATA);
172 /* Only necessary on R300, bt won't hurt others. */
173 save = bus_read_4(sc->sc_memr, RADEON_CLOCK_CNTL_INDEX);
174 tmp = save & (~0x3f | RADEON_PLL_WR_EN);
175 bus_write_4(sc->sc_memr, RADEON_CLOCK_CNTL_INDEX, tmp);
176 tmp = bus_read_4(sc->sc_memr, RADEON_CLOCK_CNTL_DATA);
177 bus_write_4(sc->sc_memr, RADEON_CLOCK_CNTL_INDEX, save);
183 atibl_pll_wreg(struct atibl_softc *sc, uint32_t reg, uint32_t val)
187 bus_write_1(sc->sc_memr, RADEON_CLOCK_CNTL_INDEX,
188 ((reg & 0x3f) | RADEON_PLL_WR_EN));
189 (void)bus_read_4(sc->sc_memr, RADEON_CLOCK_CNTL_DATA);
190 (void)bus_read_4(sc->sc_memr, RADEON_CRTC_GEN_CNTL);
192 bus_write_4(sc->sc_memr, RADEON_CLOCK_CNTL_DATA, val);
195 /* Only necessary on R300, bt won't hurt others. */
196 save = bus_read_4(sc->sc_memr, RADEON_CLOCK_CNTL_INDEX);
197 tmp = save & (~0x3f | RADEON_PLL_WR_EN);
198 bus_write_4(sc->sc_memr, RADEON_CLOCK_CNTL_INDEX, tmp);
199 tmp = bus_read_4(sc->sc_memr, RADEON_CLOCK_CNTL_DATA);
200 bus_write_4(sc->sc_memr, RADEON_CLOCK_CNTL_INDEX, save);
204 atibl_setlevel(struct atibl_softc *sc, int newlevel)
206 uint32_t lvds_gen_cntl;
207 uint32_t lvds_pll_cntl;
208 uint32_t pixclks_cntl;
209 uint32_t disp_pwr_reg;
217 lvds_gen_cntl = bus_read_4(sc->sc_memr, RADEON_LVDS_GEN_CNTL);
220 newlevel = (newlevel * 5) / 2 + 5;
221 disp_pwr_reg = bus_read_4(sc->sc_memr, RADEON_DISP_PWR_MAN);
222 disp_pwr_reg |= RADEON_AUTO_PWRUP_EN;
223 bus_write_4(sc->sc_memr, RADEON_DISP_PWR_MAN, disp_pwr_reg);
224 lvds_pll_cntl = bus_read_4(sc->sc_memr, RADEON_LVDS_PLL_CNTL);
225 lvds_pll_cntl |= RADEON_LVDS_PLL_EN;
226 bus_write_4(sc->sc_memr, RADEON_LVDS_PLL_CNTL, lvds_pll_cntl);
227 lvds_pll_cntl &= ~RADEON_LVDS_PLL_RESET;
228 bus_write_4(sc->sc_memr, RADEON_LVDS_PLL_CNTL, lvds_pll_cntl);
231 lvds_gen_cntl &= ~(RADEON_LVDS_DISPLAY_DIS |
232 RADEON_LVDS_BL_MOD_LEVEL_MASK);
233 lvds_gen_cntl |= RADEON_LVDS_ON | RADEON_LVDS_EN |
234 RADEON_LVDS_DIGON | RADEON_LVDS_BLON;
235 lvds_gen_cntl |= (newlevel << RADEON_LVDS_BL_MOD_LEVEL_SHIFT) &
236 RADEON_LVDS_BL_MOD_LEVEL_MASK;
237 lvds_gen_cntl |= RADEON_LVDS_BL_MOD_EN;
239 bus_write_4(sc->sc_memr, RADEON_LVDS_GEN_CNTL, lvds_gen_cntl);
241 pixclks_cntl = atibl_pll_rreg(sc, RADEON_PIXCLKS_CNTL);
242 atibl_pll_wreg(sc, RADEON_PIXCLKS_CNTL,
243 pixclks_cntl & ~RADEON_PIXCLK_LVDS_ALWAYS_ONb);
244 lvds_gen_cntl |= RADEON_LVDS_DISPLAY_DIS;
245 lvds_gen_cntl &= ~(RADEON_LVDS_BL_MOD_EN | RADEON_LVDS_BL_MOD_LEVEL_MASK);
246 bus_write_4(sc->sc_memr, RADEON_LVDS_GEN_CNTL, lvds_gen_cntl);
247 lvds_gen_cntl &= ~(RADEON_LVDS_ON | RADEON_LVDS_EN);
249 bus_write_4(sc->sc_memr, RADEON_LVDS_GEN_CNTL, lvds_gen_cntl);
251 atibl_pll_wreg(sc, RADEON_PIXCLKS_CNTL, pixclks_cntl);
259 atibl_getlevel(struct atibl_softc *sc)
261 uint32_t lvds_gen_cntl;
264 lvds_gen_cntl = bus_read_4(sc->sc_memr, RADEON_LVDS_GEN_CNTL);
266 level = ((lvds_gen_cntl & RADEON_LVDS_BL_MOD_LEVEL_MASK) >>
267 RADEON_LVDS_BL_MOD_LEVEL_SHIFT);
269 level = ((level - 5) * 2) / 5;
275 atibl_suspend(device_t dev)
277 struct atibl_softc *sc;
279 sc = device_get_softc(dev);
281 sc->sc_level = atibl_getlevel(sc);
282 atibl_setlevel(sc, 0);
288 atibl_resume(device_t dev)
290 struct atibl_softc *sc;
292 sc = device_get_softc(dev);
294 atibl_setlevel(sc, sc->sc_level);
300 atibl_sysctl(SYSCTL_HANDLER_ARGS)
302 struct atibl_softc *sc;
307 newlevel = atibl_getlevel(sc);
309 error = sysctl_handle_int(oidp, &newlevel, 0, req);
311 if (error || !req->newptr)
314 return (atibl_setlevel(sc, newlevel));