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: if (value) value = 1000; 78 case SND_TONE: break; 79 default: return -1; 80 } 81 82 if (value > 20 && value < 32767) 83 count = 1193182 / value; 84 85 count = bbc_count_to_reg(info, count); 86 87 guard(spinlock_irqsave)(&state->lock); 88 89 if (count) { 90 sbus_writeb(0x01, info->regs + 0); 91 sbus_writeb(0x00, info->regs + 2); 92 sbus_writeb((count >> 16) & 0xff, info->regs + 3); 93 sbus_writeb((count >> 8) & 0xff, info->regs + 4); 94 sbus_writeb(0x00, info->regs + 5); 95 } else { 96 sbus_writeb(0x00, info->regs + 0); 97 } 98 99 return 0; 100 } 101 102 static int grover_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 103 { 104 struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent); 105 struct grover_beep_info *info = &state->u.grover; 106 unsigned int count = 0; 107 108 if (type != EV_SND) 109 return -1; 110 111 switch (code) { 112 case SND_BELL: if (value) value = 1000; 113 case SND_TONE: break; 114 default: return -1; 115 } 116 117 if (value > 20 && value < 32767) 118 count = 1193182 / value; 119 120 guard(spinlock_irqsave)(&state->lock); 121 122 if (count) { 123 /* enable counter 2 */ 124 sbus_writeb(sbus_readb(info->enable_reg) | 3, info->enable_reg); 125 /* set command for counter 2, 2 byte write */ 126 sbus_writeb(0xB6, info->freq_regs + 1); 127 /* select desired HZ */ 128 sbus_writeb(count & 0xff, info->freq_regs + 0); 129 sbus_writeb((count >> 8) & 0xff, info->freq_regs + 0); 130 } else { 131 /* disable counter 2 */ 132 sbus_writeb(sbus_readb(info->enable_reg) & 0xFC, info->enable_reg); 133 } 134 135 return 0; 136 } 137 138 static int sparcspkr_probe(struct device *dev) 139 { 140 struct sparcspkr_state *state = dev_get_drvdata(dev); 141 struct input_dev *input_dev; 142 int error; 143 144 input_dev = input_allocate_device(); 145 if (!input_dev) 146 return -ENOMEM; 147 148 input_dev->name = state->name; 149 input_dev->phys = "sparc/input0"; 150 input_dev->id.bustype = BUS_ISA; 151 input_dev->id.vendor = 0x001f; 152 input_dev->id.product = 0x0001; 153 input_dev->id.version = 0x0100; 154 input_dev->dev.parent = dev; 155 156 input_dev->evbit[0] = BIT_MASK(EV_SND); 157 input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); 158 159 input_dev->event = state->event; 160 161 error = input_register_device(input_dev); 162 if (error) { 163 input_free_device(input_dev); 164 return error; 165 } 166 167 state->input_dev = input_dev; 168 169 return 0; 170 } 171 172 static void sparcspkr_shutdown(struct platform_device *dev) 173 { 174 struct sparcspkr_state *state = platform_get_drvdata(dev); 175 struct input_dev *input_dev = state->input_dev; 176 177 /* turn off the speaker */ 178 state->event(input_dev, EV_SND, SND_BELL, 0); 179 } 180 181 static int bbc_beep_probe(struct platform_device *op) 182 { 183 struct sparcspkr_state *state; 184 struct bbc_beep_info *info; 185 int err; 186 187 state = devm_kzalloc(&op->dev, sizeof(*state), GFP_KERNEL); 188 if (!state) 189 return -ENOMEM; 190 191 state->name = "Sparc BBC Speaker"; 192 state->event = bbc_spkr_event; 193 spin_lock_init(&state->lock); 194 195 struct device_node *dp __free(device_node) = of_find_node_by_path("/"); 196 if (!dp) 197 return -ENODEV; 198 199 info = &state->u.bbc; 200 info->clock_freq = of_getintprop_default(dp, "clock-frequency", 0); 201 if (!info->clock_freq) 202 return -ENODEV; 203 204 info->regs = of_ioremap(&op->resource[0], 0, 6, "bbc beep"); 205 if (!info->regs) 206 return -ENODEV; 207 208 platform_set_drvdata(op, state); 209 210 err = sparcspkr_probe(&op->dev); 211 if (err) { 212 of_iounmap(&op->resource[0], info->regs, 6); 213 return err; 214 } 215 216 return 0; 217 } 218 219 static void bbc_remove(struct platform_device *op) 220 { 221 struct sparcspkr_state *state = platform_get_drvdata(op); 222 struct input_dev *input_dev = state->input_dev; 223 struct bbc_beep_info *info = &state->u.bbc; 224 225 /* turn off the speaker */ 226 state->event(input_dev, EV_SND, SND_BELL, 0); 227 228 input_unregister_device(input_dev); 229 230 of_iounmap(&op->resource[0], info->regs, 6); 231 } 232 233 static const struct of_device_id bbc_beep_match[] = { 234 { 235 .name = "beep", 236 .compatible = "SUNW,bbc-beep", 237 }, 238 {}, 239 }; 240 MODULE_DEVICE_TABLE(of, bbc_beep_match); 241 242 static struct platform_driver bbc_beep_driver = { 243 .driver = { 244 .name = "bbcbeep", 245 .of_match_table = bbc_beep_match, 246 }, 247 .probe = bbc_beep_probe, 248 .remove = bbc_remove, 249 .shutdown = sparcspkr_shutdown, 250 }; 251 252 static int grover_beep_probe(struct platform_device *op) 253 { 254 struct sparcspkr_state *state; 255 struct grover_beep_info *info; 256 int err = -ENOMEM; 257 258 state = devm_kzalloc(&op->dev, sizeof(*state), GFP_KERNEL); 259 if (!state) 260 return err; 261 262 state->name = "Sparc Grover Speaker"; 263 state->event = grover_spkr_event; 264 spin_lock_init(&state->lock); 265 266 info = &state->u.grover; 267 info->freq_regs = of_ioremap(&op->resource[2], 0, 2, "grover beep freq"); 268 if (!info->freq_regs) 269 return err; 270 271 info->enable_reg = of_ioremap(&op->resource[3], 0, 1, "grover beep enable"); 272 if (!info->enable_reg) 273 goto out_unmap_freq_regs; 274 275 platform_set_drvdata(op, state); 276 277 err = sparcspkr_probe(&op->dev); 278 if (err) 279 goto out_clear_drvdata; 280 281 return 0; 282 283 out_clear_drvdata: 284 of_iounmap(&op->resource[3], info->enable_reg, 1); 285 286 out_unmap_freq_regs: 287 of_iounmap(&op->resource[2], info->freq_regs, 2); 288 289 return err; 290 } 291 292 static void grover_remove(struct platform_device *op) 293 { 294 struct sparcspkr_state *state = platform_get_drvdata(op); 295 struct grover_beep_info *info = &state->u.grover; 296 struct input_dev *input_dev = state->input_dev; 297 298 /* turn off the speaker */ 299 state->event(input_dev, EV_SND, SND_BELL, 0); 300 301 input_unregister_device(input_dev); 302 303 of_iounmap(&op->resource[3], info->enable_reg, 1); 304 of_iounmap(&op->resource[2], info->freq_regs, 2); 305 } 306 307 static const struct of_device_id grover_beep_match[] = { 308 { 309 .name = "beep", 310 .compatible = "SUNW,smbus-beep", 311 }, 312 {}, 313 }; 314 MODULE_DEVICE_TABLE(of, grover_beep_match); 315 316 static struct platform_driver grover_beep_driver = { 317 .driver = { 318 .name = "groverbeep", 319 .of_match_table = grover_beep_match, 320 }, 321 .probe = grover_beep_probe, 322 .remove = grover_remove, 323 .shutdown = sparcspkr_shutdown, 324 }; 325 326 static struct platform_driver * const drivers[] = { 327 &bbc_beep_driver, 328 &grover_beep_driver, 329 }; 330 331 static int __init sparcspkr_init(void) 332 { 333 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 334 } 335 336 static void __exit sparcspkr_exit(void) 337 { 338 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 339 } 340 341 module_init(sparcspkr_init); 342 module_exit(sparcspkr_exit); 343