1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Driver for PC-speaker like devices found on various Sparc systems. 4 * 5 * Copyright (c) 2002 Vojtech Pavlik 6 * Copyright (c) 2002, 2006, 2008 David S. Miller (davem@davemloft.net) 7 */ 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/input.h> 12 #include <linux/of.h> 13 #include <linux/platform_device.h> 14 #include <linux/slab.h> 15 16 #include <asm/io.h> 17 18 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); 19 MODULE_DESCRIPTION("Sparc Speaker beeper driver"); 20 MODULE_LICENSE("GPL"); 21 22 struct grover_beep_info { 23 void __iomem *freq_regs; 24 void __iomem *enable_reg; 25 }; 26 27 struct bbc_beep_info { 28 u32 clock_freq; 29 void __iomem *regs; 30 }; 31 32 struct sparcspkr_state { 33 const char *name; 34 int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value); 35 spinlock_t lock; 36 struct input_dev *input_dev; 37 union { 38 struct grover_beep_info grover; 39 struct bbc_beep_info bbc; 40 } u; 41 }; 42 43 static u32 bbc_count_to_reg(struct bbc_beep_info *info, unsigned int count) 44 { 45 u32 val, clock_freq = info->clock_freq; 46 int i; 47 48 if (!count) 49 return 0; 50 51 if (count <= clock_freq >> 20) 52 return 1 << 18; 53 54 if (count >= clock_freq >> 12) 55 return 1 << 10; 56 57 val = 1 << 18; 58 for (i = 19; i >= 11; i--) { 59 val >>= 1; 60 if (count <= clock_freq >> i) 61 break; 62 } 63 64 return val; 65 } 66 67 static int bbc_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 68 { 69 struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent); 70 struct bbc_beep_info *info = &state->u.bbc; 71 unsigned int count = 0; 72 73 if (type != EV_SND) 74 return -1; 75 76 switch (code) { 77 case SND_BELL: 78 if (value) 79 value = 1000; 80 break; 81 case SND_TONE: 82 break; 83 default: 84 return -1; 85 } 86 87 if (value > 20 && value < 32767) 88 count = 1193182 / value; 89 90 count = bbc_count_to_reg(info, count); 91 92 guard(spinlock_irqsave)(&state->lock); 93 94 if (count) { 95 sbus_writeb(0x01, info->regs + 0); 96 sbus_writeb(0x00, info->regs + 2); 97 sbus_writeb((count >> 16) & 0xff, info->regs + 3); 98 sbus_writeb((count >> 8) & 0xff, info->regs + 4); 99 sbus_writeb(0x00, info->regs + 5); 100 } else { 101 sbus_writeb(0x00, info->regs + 0); 102 } 103 104 return 0; 105 } 106 107 static int grover_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 108 { 109 struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent); 110 struct grover_beep_info *info = &state->u.grover; 111 unsigned int count = 0; 112 113 if (type != EV_SND) 114 return -1; 115 116 switch (code) { 117 case SND_BELL: 118 if (value) 119 value = 1000; 120 break; 121 case SND_TONE: 122 break; 123 default: 124 return -1; 125 } 126 127 if (value > 20 && value < 32767) 128 count = 1193182 / value; 129 130 guard(spinlock_irqsave)(&state->lock); 131 132 if (count) { 133 /* enable counter 2 */ 134 sbus_writeb(sbus_readb(info->enable_reg) | 3, info->enable_reg); 135 /* set command for counter 2, 2 byte write */ 136 sbus_writeb(0xB6, info->freq_regs + 1); 137 /* select desired HZ */ 138 sbus_writeb(count & 0xff, info->freq_regs + 0); 139 sbus_writeb((count >> 8) & 0xff, info->freq_regs + 0); 140 } else { 141 /* disable counter 2 */ 142 sbus_writeb(sbus_readb(info->enable_reg) & 0xFC, info->enable_reg); 143 } 144 145 return 0; 146 } 147 148 static int sparcspkr_probe(struct device *dev) 149 { 150 struct sparcspkr_state *state = dev_get_drvdata(dev); 151 struct input_dev *input_dev; 152 int error; 153 154 input_dev = input_allocate_device(); 155 if (!input_dev) 156 return -ENOMEM; 157 158 input_dev->name = state->name; 159 input_dev->phys = "sparc/input0"; 160 input_dev->id.bustype = BUS_ISA; 161 input_dev->id.vendor = 0x001f; 162 input_dev->id.product = 0x0001; 163 input_dev->id.version = 0x0100; 164 input_dev->dev.parent = dev; 165 166 input_dev->evbit[0] = BIT_MASK(EV_SND); 167 input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); 168 169 input_dev->event = state->event; 170 171 error = input_register_device(input_dev); 172 if (error) { 173 input_free_device(input_dev); 174 return error; 175 } 176 177 state->input_dev = input_dev; 178 179 return 0; 180 } 181 182 static void sparcspkr_shutdown(struct platform_device *dev) 183 { 184 struct sparcspkr_state *state = platform_get_drvdata(dev); 185 struct input_dev *input_dev = state->input_dev; 186 187 /* turn off the speaker */ 188 state->event(input_dev, EV_SND, SND_BELL, 0); 189 } 190 191 static int bbc_beep_probe(struct platform_device *op) 192 { 193 struct sparcspkr_state *state; 194 struct bbc_beep_info *info; 195 int err; 196 197 state = devm_kzalloc(&op->dev, sizeof(*state), GFP_KERNEL); 198 if (!state) 199 return -ENOMEM; 200 201 state->name = "Sparc BBC Speaker"; 202 state->event = bbc_spkr_event; 203 spin_lock_init(&state->lock); 204 205 struct device_node *dp __free(device_node) = of_find_node_by_path("/"); 206 if (!dp) 207 return -ENODEV; 208 209 info = &state->u.bbc; 210 info->clock_freq = of_getintprop_default(dp, "clock-frequency", 0); 211 if (!info->clock_freq) 212 return -ENODEV; 213 214 info->regs = of_ioremap(&op->resource[0], 0, 6, "bbc beep"); 215 if (!info->regs) 216 return -ENODEV; 217 218 platform_set_drvdata(op, state); 219 220 err = sparcspkr_probe(&op->dev); 221 if (err) { 222 of_iounmap(&op->resource[0], info->regs, 6); 223 return err; 224 } 225 226 return 0; 227 } 228 229 static void bbc_remove(struct platform_device *op) 230 { 231 struct sparcspkr_state *state = platform_get_drvdata(op); 232 struct input_dev *input_dev = state->input_dev; 233 struct bbc_beep_info *info = &state->u.bbc; 234 235 /* turn off the speaker */ 236 state->event(input_dev, EV_SND, SND_BELL, 0); 237 238 input_unregister_device(input_dev); 239 240 of_iounmap(&op->resource[0], info->regs, 6); 241 } 242 243 static const struct of_device_id bbc_beep_match[] = { 244 { 245 .name = "beep", 246 .compatible = "SUNW,bbc-beep", 247 }, 248 {}, 249 }; 250 MODULE_DEVICE_TABLE(of, bbc_beep_match); 251 252 static struct platform_driver bbc_beep_driver = { 253 .driver = { 254 .name = "bbcbeep", 255 .of_match_table = bbc_beep_match, 256 }, 257 .probe = bbc_beep_probe, 258 .remove = bbc_remove, 259 .shutdown = sparcspkr_shutdown, 260 }; 261 262 static int grover_beep_probe(struct platform_device *op) 263 { 264 struct sparcspkr_state *state; 265 struct grover_beep_info *info; 266 int err = -ENOMEM; 267 268 state = devm_kzalloc(&op->dev, sizeof(*state), GFP_KERNEL); 269 if (!state) 270 return err; 271 272 state->name = "Sparc Grover Speaker"; 273 state->event = grover_spkr_event; 274 spin_lock_init(&state->lock); 275 276 info = &state->u.grover; 277 info->freq_regs = of_ioremap(&op->resource[2], 0, 2, "grover beep freq"); 278 if (!info->freq_regs) 279 return err; 280 281 info->enable_reg = of_ioremap(&op->resource[3], 0, 1, "grover beep enable"); 282 if (!info->enable_reg) 283 goto out_unmap_freq_regs; 284 285 platform_set_drvdata(op, state); 286 287 err = sparcspkr_probe(&op->dev); 288 if (err) 289 goto out_clear_drvdata; 290 291 return 0; 292 293 out_clear_drvdata: 294 of_iounmap(&op->resource[3], info->enable_reg, 1); 295 296 out_unmap_freq_regs: 297 of_iounmap(&op->resource[2], info->freq_regs, 2); 298 299 return err; 300 } 301 302 static void grover_remove(struct platform_device *op) 303 { 304 struct sparcspkr_state *state = platform_get_drvdata(op); 305 struct grover_beep_info *info = &state->u.grover; 306 struct input_dev *input_dev = state->input_dev; 307 308 /* turn off the speaker */ 309 state->event(input_dev, EV_SND, SND_BELL, 0); 310 311 input_unregister_device(input_dev); 312 313 of_iounmap(&op->resource[3], info->enable_reg, 1); 314 of_iounmap(&op->resource[2], info->freq_regs, 2); 315 } 316 317 static const struct of_device_id grover_beep_match[] = { 318 { 319 .name = "beep", 320 .compatible = "SUNW,smbus-beep", 321 }, 322 {}, 323 }; 324 MODULE_DEVICE_TABLE(of, grover_beep_match); 325 326 static struct platform_driver grover_beep_driver = { 327 .driver = { 328 .name = "groverbeep", 329 .of_match_table = grover_beep_match, 330 }, 331 .probe = grover_beep_probe, 332 .remove = grover_remove, 333 .shutdown = sparcspkr_shutdown, 334 }; 335 336 static struct platform_driver * const drivers[] = { 337 &bbc_beep_driver, 338 &grover_beep_driver, 339 }; 340 341 static int __init sparcspkr_init(void) 342 { 343 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 344 } 345 346 static void __exit sparcspkr_exit(void) 347 { 348 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 349 } 350 351 module_init(sparcspkr_init); 352 module_exit(sparcspkr_exit); 353