lightbar.c revision 1.1
1 /* $NetBSD: lightbar.c,v 1.1 2025/09/08 08:08:15 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 1.1 2025/09/08 08:08:15 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 <uvm/uvm_extern.h> 39 40 #include <dev/ofw/openfirm.h> 41 #include <machine/autoconf.h> 42 #include <machine/pio.h> 43 #include <macppc/dev/dbdma.h> 44 #include <macppc/dev/obiovar.h> 45 #include <macppc/dev/i2sreg.h> 46 47 #ifdef LIGHTBAR_DEBUG 48 # define DPRINTF printf 49 #else 50 # define DPRINTF while (0) printf 51 #endif 52 53 struct lightbar_softc { 54 device_t sc_dev; 55 int sc_node; 56 bus_space_tag_t sc_tag; 57 bus_space_handle_t sc_bsh; 58 bus_space_handle_t sc_odmah; 59 dbdma_regmap_t *sc_odma; 60 struct dbdma_command *sc_odmacmd; 61 uint32_t sc_baseaddr; 62 uint32_t *sc_dmabuf; 63 lwp_t *sc_thread; 64 struct cpu_info *sc_cpu[2]; 65 }; 66 67 static int lightbar_match(device_t, struct cfdata *, void *); 68 static void lightbar_attach(device_t, device_t, void *); 69 static void lightbar_thread(void *); 70 71 CFATTACH_DECL_NEW(lightbar, sizeof(struct lightbar_softc), lightbar_match, 72 lightbar_attach, NULL, NULL); 73 74 /* 75 * upper 16 bit are LEDs from the top right to the bottom left 76 * however, the hardware has them rotated so the uppper left bit is in 1 77 */ 78 #define LEDMASK(x) ((x << 1) | (((x) & 0x80000000) >> 31)) 79 80 static int 81 lightbar_match(device_t parent, struct cfdata *match, void *aux) 82 { 83 struct confargs *ca; 84 int soundbus, soundchip; 85 char buf[32]; 86 87 ca = aux; 88 if (strcmp(ca->ca_name, "i2s") != 0) 89 return 0; 90 91 if ((soundbus = OF_child(ca->ca_node)) == 0 || 92 (soundchip = OF_child(soundbus)) == 0) 93 return 0; 94 95 if (OF_getprop(soundchip, "virtual", buf, 32) == 0) 96 return 200; /* beat out snapper */ 97 98 return 0; 99 } 100 101 static void 102 lightbar_attach(device_t parent, device_t self, void *aux) 103 { 104 struct lightbar_softc *sc; 105 struct confargs *ca; 106 struct dbdma_command *cmd; 107 uint32_t reg[6], x; 108 int i, timo; 109 110 sc = device_private(self); 111 sc->sc_dev = self; 112 113 ca = aux; 114 sc->sc_node = ca->ca_node; 115 sc->sc_tag = ca->ca_tag; 116 117 sc->sc_odmacmd = dbdma_alloc(4 * sizeof(struct dbdma_command), NULL); 118 119 sc->sc_baseaddr = ca->ca_baseaddr; 120 121 OF_getprop(sc->sc_node, "reg", reg, sizeof(reg)); 122 reg[0] += ca->ca_baseaddr; 123 reg[2] += ca->ca_baseaddr; 124 125 bus_space_map(sc->sc_tag, reg[0], reg[1], 0, &sc->sc_bsh); 126 obio_space_map(reg[2], reg[3], &sc->sc_odmah); 127 sc->sc_odma = bus_space_vaddr(sc->sc_tag, sc->sc_odmah); 128 DPRINTF("reg %08x odma %08x\n", (uint32_t)sc->sc_bsh, (uint32_t)sc->sc_odmah); 129 130 aprint_normal("\n"); 131 132 /* PMF event handler */ 133 pmf_device_register(sc->sc_dev, NULL, NULL); 134 135 /* enable i2s goop */ 136 x = obio_read_4(KEYLARGO_FCR1); 137 x |= I2S0CLKEN | I2S0EN; 138 obio_write_4(KEYLARGO_FCR1, x); 139 140 /* Clear CLKSTOPPEND. */ 141 bus_space_write_4(sc->sc_tag, sc->sc_bsh, I2S_INT, I2S_INT_CLKSTOPPEND); 142 143 x = obio_read_4(KEYLARGO_FCR1); /* FCR */ 144 x &= ~I2S0CLKEN; /* XXX I2S0 */ 145 obio_write_4(KEYLARGO_FCR1, x); 146 147 /* Wait until clock is stopped. */ 148 for (timo = 1000; timo > 0; timo--) { 149 if (bus_space_read_4(sc->sc_tag, sc->sc_bsh, I2S_INT) & 150 I2S_INT_CLKSTOPPEND) 151 goto done; 152 delay(1); 153 } 154 DPRINTF("timeout\n"); 155 done: 156 bus_space_write_4(sc->sc_tag, sc->sc_bsh, I2S_FORMAT, 0x01fa0000); 157 158 x = obio_read_4(KEYLARGO_FCR1); 159 x |= I2S0CLKEN; 160 obio_write_4(KEYLARGO_FCR1, x); 161 162 sc->sc_dmabuf = kmem_alloc(4096, KM_SLEEP); 163 164 /* initial pattern, just to say hi */ 165 for (i = 0; i < 32; i++) { 166 sc->sc_dmabuf[i] = LEDMASK(0xaa550000); 167 } 168 169 /* 170 * We use a single DMA buffer, with just 8 32bit words which the DBDMA 171 * engine loops over. That way we can: 172 * - get away without using interrupts, just scribble a new pattern into 173 * the buffer 174 * - play PWM tricks with the LEDs, giving us 8 levels of brightness 175 */ 176 cmd = sc->sc_odmacmd; 177 DBDMA_BUILD(cmd, DBDMA_CMD_OUT_MORE, 0, 32, vtophys((vaddr_t)sc->sc_dmabuf), 178 0, DBDMA_WAIT_NEVER, DBDMA_BRANCH_NEVER); 179 cmd++; 180 DBDMA_BUILD(cmd, DBDMA_CMD_NOP, 0, 0, 181 0/*vtophys((vaddr_t)sc->sc_odmacmd)*/, 0, DBDMA_WAIT_NEVER, 182 DBDMA_BRANCH_ALWAYS); 183 184 out32rb(&cmd->d_cmddep, vtophys((vaddr_t)sc->sc_odmacmd)); 185 186 dbdma_start(sc->sc_odma, sc->sc_odmacmd); 187 188 sc->sc_cpu[0] = cpu_lookup(0); 189 sc->sc_cpu[1] = cpu_lookup(1); 190 aprint_normal_dev(sc->sc_dev, "monitoring %s\n", 191 sc->sc_cpu[1] == NULL ? "one CPU" : "two CPUs"); 192 193 if (kthread_create(PRI_NONE, 0, NULL, lightbar_thread, sc, 194 &sc->sc_thread, "%s", "lightbar") != 0) { 195 aprint_error_dev(self, "unable to create kthread\n"); 196 } 197 198 } 199 200 /* 201 * this draws a bar into out[0..7], system time as dim, other CPU time as 202 * bright, idle as off 203 * prev[CPUSTATES] stores old counter values, old[2] old bar lengths 204 */ 205 static int 206 lightbar_update(uint64_t *cp_time, uint64_t *prev, int *old, uint32_t *out) 207 { 208 uint64_t total = 0; 209 int all, sys, idle, syst, i; 210 211 for (i = 0; i < CPUSTATES; i++) 212 total += cp_time[i] - prev[i]; 213 idle = (int)(cp_time[CP_IDLE] - prev[CP_IDLE]); 214 syst = (int)(cp_time[CP_SYS] - prev[CP_SYS]); 215 all = (total - idle) * 8 / total; 216 sys = syst * 8 / total; 217 for (i = 0; i < CPUSTATES; i++) 218 prev[i] = cp_time[i]; 219 if ((all != old[0]) || (sys != old[1])) { 220 for (i = 0; i < sys; i++) out[i] = 2; 221 for (; i < all; i++) out[i] = 8; 222 for (; i < 8; i++) out[i] = 0; 223 old[0] = all; 224 old[1] = sys; 225 return 1; 226 } 227 return 0; 228 } 229 230 static void 231 lightbar_thread(void *cookie) 232 { 233 struct lightbar_softc *sc = cookie; 234 uint32_t latch; 235 uint64_t prev[2 * CPUSTATES]; 236 int i, j, old[4] = {0, 0, 0, 0}, intensity[16]; 237 238 for (i = 0; i < 2 * CPUSTATES; i++) 239 prev[i] = 0; 240 241 tsleep(cookie, PRI_NONE, "lights", hz); 242 243 while (1) { 244 int update; 245 /* draw CPU0's usage into the upper bar */ 246 update = lightbar_update(sc->sc_cpu[0]->ci_schedstate.spc_cp_time, 247 prev, old, &intensity[8]); 248 if (sc->sc_cpu[1] != NULL) { 249 /* 250 * if we have a 2nd CPU draw its usage into the lower 251 * bar 252 */ 253 update |= lightbar_update( 254 sc->sc_cpu[1]->ci_schedstate.spc_cp_time, 255 &prev[CPUSTATES], &old[2], intensity); 256 } else { 257 /* 258 * if we don't have a 2nd CPU just duplicate the bar 259 * from the first 260 */ 261 for (i = 0; i < 8; i++) 262 intensity[i] = intensity[i + 8]; 263 } 264 if (update) { 265 /* 266 * this turns our intensity map into a bit pattern for 267 * the hardware - we have 8 samples in our buffer, for 268 * each LED we set the corresponding bit in intensity[j] 269 * samples 270 */ 271 for (i = 0; i < 8; i++) { 272 latch = 0; 273 for (j = 0; j < 16; j++) { 274 if (intensity[j] > i) 275 latch |= 1 << (j + 16); 276 } 277 sc->sc_dmabuf[i] = LEDMASK(latch); 278 } 279 } 280 281 tsleep(cookie, PRI_NONE, "lights", hz / 5); 282 } 283 kthread_exit(0); 284 } 285
Indexes created Tue Sep 23 22:09:46 GMT 2025