lightbar.c revision 1.2
1 /* $NetBSD: lightbar.c,v 1.2 2025/09/15 06:42:10 macallan Exp $ */ 2 3 /* 4 * Copyright (c) 2025 Michael Lorenz 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: lightbar.c,v 1.2 2025/09/15 06:42:10 macallan Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/device.h> 34 #include <sys/systm.h> 35 #include <sys/kmem.h> 36 #include <sys/kthread.h> 37 #include <sys/cpu.h> 38 #include <sys/sysctl.h> 39 #include <uvm/uvm_extern.h> 40 41 #include <dev/ofw/openfirm.h> 42 #include <machine/autoconf.h> 43 #include <machine/pio.h> 44 #include <macppc/dev/dbdma.h> 45 #include <macppc/dev/obiovar.h> 46 #include <macppc/dev/i2sreg.h> 47 48 #ifdef LIGHTBAR_DEBUG 49 # define DPRINTF printf 50 #else 51 # define DPRINTF while (0) printf 52 #endif 53 54 struct lightbar_softc { 55 device_t sc_dev; 56 int sc_node; 57 bus_space_tag_t sc_tag; 58 bus_space_handle_t sc_bsh; 59 bus_space_handle_t sc_odmah; 60 dbdma_regmap_t *sc_odma; 61 struct dbdma_command *sc_odmacmd; 62 uint32_t sc_baseaddr; 63 uint32_t *sc_dmabuf; 64 lwp_t *sc_thread; 65 int sc_sys, sc_user; 66 struct cpu_info *sc_cpu[2]; 67 struct sysctlnode *sc_sysctl_me; 68 }; 69 70 static int lightbar_match(device_t, struct cfdata *, void *); 71 static void lightbar_attach(device_t, device_t, void *); 72 static void lightbar_thread(void *); 73 74 CFATTACH_DECL_NEW(lightbar, sizeof(struct lightbar_softc), lightbar_match, 75 lightbar_attach, NULL, NULL); 76 77 /* 78 * upper 16 bit are LEDs from the top right to the bottom left 79 * however, the hardware has them rotated so the uppper left bit is in 1 80 */ 81 #define LEDMASK(x) ((x << 1) | (((x) & 0x80000000) >> 31)) 82 83 static int 84 lightbar_match(device_t parent, struct cfdata *match, void *aux) 85 { 86 struct confargs *ca; 87 int soundbus, soundchip; 88 char buf[32]; 89 90 ca = aux; 91 if (strcmp(ca->ca_name, "i2s") != 0) 92 return 0; 93 94 if ((soundbus = OF_child(ca->ca_node)) == 0 || 95 (soundchip = OF_child(soundbus)) == 0) 96 return 0; 97 98 if (OF_getprop(soundchip, "virtual", buf, 32) == 0) 99 return 200; /* beat out snapper */ 100 101 return 0; 102 } 103 104 static void 105 lightbar_attach(device_t parent, device_t self, void *aux) 106 { 107 struct lightbar_softc *sc; 108 struct confargs *ca; 109 struct dbdma_command *cmd; 110 struct sysctlnode *node; 111 uint32_t reg[6], x; 112 int i, timo; 113 114 sc = device_private(self); 115 sc->sc_dev = self; 116 117 ca = aux; 118 sc->sc_node = ca->ca_node; 119 sc->sc_tag = ca->ca_tag; 120 121 sc->sc_odmacmd = dbdma_alloc(4 * sizeof(struct dbdma_command), NULL); 122 123 sc->sc_baseaddr = ca->ca_baseaddr; 124 125 /* 126 * default brightnesss for system and user time bar 127 * can be changed via sysctl later on 128 */ 129 sc->sc_sys = 2; 130 sc->sc_user = 8; 131 132 OF_getprop(sc->sc_node, "reg", reg, sizeof(reg)); 133 reg[0] += ca->ca_baseaddr; 134 reg[2] += ca->ca_baseaddr; 135 136 bus_space_map(sc->sc_tag, reg[0], reg[1], 0, &sc->sc_bsh); 137 obio_space_map(reg[2], reg[3], &sc->sc_odmah); 138 sc->sc_odma = bus_space_vaddr(sc->sc_tag, sc->sc_odmah); 139 DPRINTF("reg %08x odma %08x\n", (uint32_t)sc->sc_bsh, (uint32_t)sc->sc_odmah); 140 141 aprint_normal("\n"); 142 143 /* PMF event handler */ 144 pmf_device_register(sc->sc_dev, NULL, NULL); 145 146 /* enable i2s goop */ 147 x = obio_read_4(KEYLARGO_FCR1); 148 x |= I2S0CLKEN | I2S0EN; 149 obio_write_4(KEYLARGO_FCR1, x); 150 151 /* Clear CLKSTOPPEND. */ 152 bus_space_write_4(sc->sc_tag, sc->sc_bsh, I2S_INT, I2S_INT_CLKSTOPPEND); 153 154 x = obio_read_4(KEYLARGO_FCR1); /* FCR */ 155 x &= ~I2S0CLKEN; /* XXX I2S0 */ 156 obio_write_4(KEYLARGO_FCR1, x); 157 158 /* Wait until clock is stopped. */ 159 for (timo = 1000; timo > 0; timo--) { 160 if (bus_space_read_4(sc->sc_tag, sc->sc_bsh, I2S_INT) & 161 I2S_INT_CLKSTOPPEND) 162 goto done; 163 delay(1); 164 } 165 DPRINTF("timeout\n"); 166 done: 167 bus_space_write_4(sc->sc_tag, sc->sc_bsh, I2S_FORMAT, 0x01fa0000); 168 169 x = obio_read_4(KEYLARGO_FCR1); 170 x |= I2S0CLKEN; 171 obio_write_4(KEYLARGO_FCR1, x); 172 173 sc->sc_dmabuf = kmem_alloc(4096, KM_SLEEP); 174 175 /* initial pattern, just to say hi */ 176 for (i = 0; i < 32; i++) { 177 sc->sc_dmabuf[i] = LEDMASK(0xaa550000); 178 } 179 180 /* 181 * We use a single DMA buffer, with just 8 32bit words which the DBDMA 182 * engine loops over. That way we can: 183 * - get away without using interrupts, just scribble a new pattern into 184 * the buffer 185 * - play PWM tricks with the LEDs, giving us 8 levels of brightness 186 */ 187 cmd = sc->sc_odmacmd; 188 DBDMA_BUILD(cmd, DBDMA_CMD_OUT_MORE, 0, 32, vtophys((vaddr_t)sc->sc_dmabuf), 189 0, DBDMA_WAIT_NEVER, DBDMA_BRANCH_NEVER); 190 cmd++; 191 DBDMA_BUILD(cmd, DBDMA_CMD_NOP, 0, 0, 192 0/*vtophys((vaddr_t)sc->sc_odmacmd)*/, 0, DBDMA_WAIT_NEVER, 193 DBDMA_BRANCH_ALWAYS); 194 195 out32rb(&cmd->d_cmddep, vtophys((vaddr_t)sc->sc_odmacmd)); 196 197 dbdma_start(sc->sc_odma, sc->sc_odmacmd); 198 199 sc->sc_cpu[0] = cpu_lookup(0); 200 sc->sc_cpu[1] = cpu_lookup(1); 201 aprint_normal_dev(sc->sc_dev, "monitoring %s\n", 202 sc->sc_cpu[1] == NULL ? "one CPU" : "two CPUs"); 203 204 if (kthread_create(PRI_NONE, 0, NULL, lightbar_thread, sc, 205 &sc->sc_thread, "%s", "lightbar") != 0) { 206 aprint_error_dev(self, "unable to create kthread\n"); 207 } 208 209 /* setup sysctl nodes */ 210 sysctl_createv(NULL, 0, NULL, (void *) &sc->sc_sysctl_me, 211 CTLFLAG_READWRITE, 212 CTLTYPE_NODE, device_xname(sc->sc_dev), NULL, 213 NULL, 0, NULL, 0, 214 CTL_HW, CTL_CREATE, CTL_EOL); 215 sysctl_createv(NULL, 0, NULL, (void *) &node, 216 CTLFLAG_READWRITE | CTLFLAG_OWNDESC, 217 CTLTYPE_INT, "sys", "system time", 218 NULL, 0, (void *)&sc->sc_sys, 0, 219 CTL_HW, 220 sc->sc_sysctl_me->sysctl_num, 221 CTL_CREATE, CTL_EOL); 222 sysctl_createv(NULL, 0, NULL, (void *) &node, 223 CTLFLAG_READWRITE | CTLFLAG_OWNDESC, 224 CTLTYPE_INT, "user", "user time", 225 NULL, 0, (void *)&sc->sc_user, 0, 226 CTL_HW, 227 sc->sc_sysctl_me->sysctl_num, 228 CTL_CREATE, CTL_EOL); 229 } 230 231 /* 232 * this draws a bar into out[0..7], system time as dim, other CPU time as 233 * bright, idle as off 234 * prev[CPUSTATES] stores old counter values, old[2] old bar lengths 235 */ 236 static int 237 lightbar_update(struct lightbar_softc *sc, uint64_t *cp_time, uint64_t *prev, 238 int *old, uint32_t *out) 239 { 240 uint64_t total = 0; 241 int all, sys, idle, syst, i; 242 243 for (i = 0; i < CPUSTATES; i++) 244 total += cp_time[i] - prev[i]; 245 idle = (int)(cp_time[CP_IDLE] - prev[CP_IDLE]); 246 syst = (int)(cp_time[CP_SYS] - prev[CP_SYS]); 247 all = (total - idle) * 8 / total; 248 sys = syst * 8 / total; 249 for (i = 0; i < CPUSTATES; i++) 250 prev[i] = cp_time[i]; 251 if ((all != old[0]) || (sys != old[1])) { 252 for (i = 0; i < sys; i++) out[i] = sc->sc_sys; 253 for (; i < all; i++) out[i] = sc->sc_user; 254 for (; i < 8; i++) out[i] = 0; 255 old[0] = all; 256 old[1] = sys; 257 return 1; 258 } 259 return 0; 260 } 261 262 static void 263 lightbar_thread(void *cookie) 264 { 265 struct lightbar_softc *sc = cookie; 266 uint32_t latch; 267 uint64_t prev[2 * CPUSTATES]; 268 int i, j, old[4] = {0, 0, 0, 0}, intensity[16]; 269 270 for (i = 0; i < 2 * CPUSTATES; i++) 271 prev[i] = 0; 272 273 tsleep(cookie, PRI_NONE, "lights", hz); 274 275 while (1) { 276 int update; 277 /* draw CPU0's usage into the upper bar */ 278 update = lightbar_update(sc, 279 sc->sc_cpu[0]->ci_schedstate.spc_cp_time, 280 prev, old, &intensity[8]); 281 if (sc->sc_cpu[1] != NULL) { 282 /* 283 * if we have a 2nd CPU draw its usage into the lower 284 * bar 285 */ 286 update |= lightbar_update(sc, 287 sc->sc_cpu[1]->ci_schedstate.spc_cp_time, 288 &prev[CPUSTATES], &old[2], intensity); 289 } else { 290 /* 291 * if we don't have a 2nd CPU just duplicate the bar 292 * from the first 293 */ 294 for (i = 0; i < 8; i++) 295 intensity[i] = intensity[i + 8]; 296 } 297 if (update) { 298 /* 299 * this turns our intensity map into a bit pattern for 300 * the hardware - we have 8 samples in our buffer, for 301 * each LED we set the corresponding bit in intensity[j] 302 * samples 303 */ 304 for (i = 0; i < 8; i++) { 305 latch = 0; 306 for (j = 0; j < 16; j++) { 307 if (intensity[j] > i) 308 latch |= 1 << (j + 16); 309 } 310 sc->sc_dmabuf[i] = LEDMASK(latch); 311 } 312 } 313 314 tsleep(cookie, PRI_NONE, "lights", hz / 5); 315 } 316 kthread_exit(0); 317 } 318
Indexes created Wed Sep 24 02:09:48 GMT 2025