platforms/44x/warp.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * PIKA Warp(tm) board specific routines
   4  *
   5  * Copyright (c) 2008-2009 PIKA Technologies
   6  *   Sean MacLennan <smaclennan@pikatech.com>
   7  */
   8 #include <linux/err.h>
   9 #include <linux/init.h>
  10 #include <linux/of_platform.h>
  11 #include <linux/kthread.h>
  12 #include <linux/leds.h>
  13 #include <linux/i2c.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/delay.h>
  16 #include <linux/of_address.h>
  17 #include <linux/of_irq.h>
  18 #include <linux/gpio/consumer.h>
  19 #include <linux/slab.h>
  20 #include <linux/export.h>
  21
  22 #include <asm/machdep.h>
  23 #include <asm/udbg.h>
  24 #include <asm/time.h>
  25 #include <asm/uic.h>
  26 #include <asm/ppc4xx.h>
  27 #include <asm/dma.h>
  28
  29
  30 static const struct of_device_id warp_of_bus[] __initconst = {
  31         { .compatible = "ibm,plb4", },
  32         { .compatible = "ibm,opb", },
  33         { .compatible = "ibm,ebc", },
  34         {},
  35 };
  36
  37 static int __init warp_device_probe(void)
  38 {
  39         of_platform_bus_probe(NULL, warp_of_bus, NULL);
  40         return 0;
  41 }
  42 machine_device_initcall(warp, warp_device_probe);
  43
  44 define_machine(warp) {
  45         .name           = "Warp",
  46         .compatible     = "pika,warp",
  47         .progress       = udbg_progress,
  48         .init_IRQ       = uic_init_tree,
  49         .get_irq        = uic_get_irq,
  50         .restart        = ppc4xx_reset_system,
  51 };
  52
  53
  54 static int __init warp_post_info(void)
  55 {
  56         struct device_node *np;
  57         void __iomem *fpga;
  58         u32 post1, post2;
  59
  60         /* Sighhhh... POST information is in the sd area. */
  61         np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
  62         if (np == NULL)
  63                 return -ENOENT;
  64
  65         fpga = of_iomap(np, 0);
  66         of_node_put(np);
  67         if (fpga == NULL)
  68                 return -ENOENT;
  69
  70         post1 = in_be32(fpga + 0x40);
  71         post2 = in_be32(fpga + 0x44);
  72
  73         iounmap(fpga);
  74
  75         if (post1 || post2)
  76                 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
  77         else
  78                 printk(KERN_INFO "Warp POST OK\n");
  79
  80         return 0;
  81 }
  82
  83
  84 #ifdef CONFIG_SENSORS_AD7414
  85
  86 static LIST_HEAD(dtm_shutdown_list);
  87 static void __iomem *dtm_fpga;
  88
  89 struct dtm_shutdown {
  90         struct list_head list;
  91         void (*func)(void *arg);
  92         void *arg;
  93 };
  94
  95 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
  96 {
  97         struct dtm_shutdown *shutdown;
  98
  99         shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
 100         if (shutdown == NULL)
 101                 return -ENOMEM;
 102
 103         shutdown->func = func;
 104         shutdown->arg = arg;
 105
 106         list_add(&shutdown->list, &dtm_shutdown_list);
 107
 108         return 0;
 109 }
 110
 111 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
 112 {
 113         struct dtm_shutdown *shutdown;
 114
 115         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
 116                 if (shutdown->func == func && shutdown->arg == arg) {
 117                         list_del(&shutdown->list);
 118                         kfree(shutdown);
 119                         return 0;
 120                 }
 121
 122         return -EINVAL;
 123 }
 124
 125 #define WARP_GREEN_LED  0
 126 #define WARP_RED_LED    1
 127
 128 static struct gpio_led warp_gpio_led_pins[] = {
 129         [WARP_GREEN_LED] = {
 130                 .name           = "green",
 131                 .default_state  = LEDS_DEFSTATE_KEEP,
 132                 .gpiod          = NULL, /* to be filled by pika_setup_leds() */
 133         },
 134         [WARP_RED_LED] = {
 135                 .name           = "red",
 136                 .default_state  = LEDS_DEFSTATE_KEEP,
 137                 .gpiod          = NULL, /* to be filled by pika_setup_leds() */
 138         },
 139 };
 140
 141 static struct gpio_led_platform_data warp_gpio_led_data = {
 142         .leds           = warp_gpio_led_pins,
 143         .num_leds       = ARRAY_SIZE(warp_gpio_led_pins),
 144 };
 145
 146 static struct platform_device warp_gpio_leds = {
 147         .name   = "leds-gpio",
 148         .id     = -1,
 149         .dev    = {
 150                 .platform_data = &warp_gpio_led_data,
 151         },
 152 };
 153
 154 static irqreturn_t temp_isr(int irq, void *context)
 155 {
 156         struct dtm_shutdown *shutdown;
 157         int value = 1;
 158
 159         local_irq_disable();
 160
 161         gpiod_set_value(warp_gpio_led_pins[WARP_GREEN_LED].gpiod, 0);
 162
 163         /* Run through the shutdown list. */
 164         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
 165                 shutdown->func(shutdown->arg);
 166
 167         printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
 168
 169         while (1) {
 170                 if (dtm_fpga) {
 171                         unsigned reset = in_be32(dtm_fpga + 0x14);
 172                         out_be32(dtm_fpga + 0x14, reset);
 173                 }
 174
 175                 gpiod_set_value(warp_gpio_led_pins[WARP_RED_LED].gpiod, value);
 176                 value ^= 1;
 177                 mdelay(500);
 178         }
 179
 180         /* Not reached */
 181         return IRQ_HANDLED;
 182 }
 183
 184 /*
 185  * Because green and red power LEDs are normally driven by leds-gpio driver,
 186  * but in case of critical temperature shutdown we want to drive them
 187  * ourselves, we acquire both and then create leds-gpio platform device
 188  * ourselves, instead of doing it through device tree. This way we can still
 189  * keep access to the gpios and use them when needed.
 190  */
 191 static int pika_setup_leds(void)
 192 {
 193         struct device_node *np, *child;
 194         struct gpio_desc *gpio;
 195         struct gpio_led *led;
 196         int led_count = 0;
 197         int error;
 198         int i;
 199
 200         np = of_find_compatible_node(NULL, NULL, "warp-power-leds");
 201         if (!np) {
 202                 printk(KERN_ERR __FILE__ ": Unable to find leds\n");
 203                 return -ENOENT;
 204         }
 205
 206         for_each_child_of_node(np, child) {
 207                 for (i = 0; i < ARRAY_SIZE(warp_gpio_led_pins); i++) {
 208                         led = &warp_gpio_led_pins[i];
 209
 210                         if (!of_node_name_eq(child, led->name))
 211                                 continue;
 212
 213                         if (led->gpiod) {
 214                                 printk(KERN_ERR __FILE__ ": %s led has already been defined\n",
 215                                        led->name);
 216                                 continue;
 217                         }
 218
 219                         gpio = fwnode_gpiod_get_index(of_fwnode_handle(child),
 220                                                       NULL, 0, GPIOD_ASIS,
 221                                                       led->name);
 222                         error = PTR_ERR_OR_ZERO(gpio);
 223                         if (error) {
 224                                 printk(KERN_ERR __FILE__ ": Failed to get %s led gpio: %d\n",
 225                                        led->name, error);
 226                                 of_node_put(child);
 227                                 goto err_cleanup_pins;
 228                         }
 229
 230                         led->gpiod = gpio;
 231                         led_count++;
 232                 }
 233         }
 234
 235         of_node_put(np);
 236
 237         /* Skip device registration if no leds have been defined */
 238         if (led_count) {
 239                 error = platform_device_register(&warp_gpio_leds);
 240                 if (error) {
 241                         printk(KERN_ERR __FILE__ ": Unable to add leds-gpio: %d\n",
 242                                error);
 243                         goto err_cleanup_pins;
 244                 }
 245         }
 246
 247         return 0;
 248
 249 err_cleanup_pins:
 250         for (i = 0; i < ARRAY_SIZE(warp_gpio_led_pins); i++) {
 251                 led = &warp_gpio_led_pins[i];
 252                 gpiod_put(led->gpiod);
 253                 led->gpiod = NULL;
 254         }
 255         return error;
 256 }
 257
 258 static void pika_setup_critical_temp(struct device_node *np,
 259                                      struct i2c_client *client)
 260 {
 261         int irq, rc;
 262
 263         /* Do this before enabling critical temp interrupt since we
 264          * may immediately interrupt.
 265          */
 266         pika_setup_leds();
 267
 268         /* These registers are in 1 degree increments. */
 269         i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */
 270         i2c_smbus_write_byte_data(client, 3,  0); /* Tlow */
 271
 272         irq = irq_of_parse_and_map(np, 0);
 273         if (!irq) {
 274                 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
 275                 return;
 276         }
 277
 278         rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
 279         if (rc) {
 280                 printk(KERN_ERR __FILE__
 281                        ": Unable to request ad7414 irq %d = %d\n", irq, rc);
 282                 return;
 283         }
 284 }
 285
 286 static inline void pika_dtm_check_fan(void __iomem *fpga)
 287 {
 288         static int fan_state;
 289         u32 fan = in_be32(fpga + 0x34) & (1 << 14);
 290
 291         if (fan_state != fan) {
 292                 fan_state = fan;
 293                 if (fan)
 294                         printk(KERN_WARNING "Fan rotation error detected."
 295                                    " Please check hardware.\n");
 296         }
 297 }
 298
 299 static int pika_dtm_thread(void __iomem *fpga)
 300 {
 301         struct device_node *np;
 302         struct i2c_client *client;
 303
 304         np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
 305         if (np == NULL)
 306                 return -ENOENT;
 307
 308         client = of_find_i2c_device_by_node(np);
 309         if (client == NULL) {
 310                 of_node_put(np);
 311                 return -ENOENT;
 312         }
 313
 314         pika_setup_critical_temp(np, client);
 315
 316         of_node_put(np);
 317
 318         printk(KERN_INFO "Warp DTM thread running.\n");
 319
 320         while (!kthread_should_stop()) {
 321                 int val;
 322
 323                 val = i2c_smbus_read_word_data(client, 0);
 324                 if (val < 0)
 325                         dev_dbg(&client->dev, "DTM read temp failed.\n");
 326                 else {
 327                         s16 temp = swab16(val);
 328                         out_be32(fpga + 0x20, temp);
 329                 }
 330
 331                 pika_dtm_check_fan(fpga);
 332
 333                 set_current_state(TASK_INTERRUPTIBLE);
 334                 schedule_timeout(HZ);
 335         }
 336
 337         return 0;
 338 }
 339
 340 static int __init pika_dtm_start(void)
 341 {
 342         struct task_struct *dtm_thread;
 343         struct device_node *np;
 344
 345         np = of_find_compatible_node(NULL, NULL, "pika,fpga");
 346         if (np == NULL)
 347                 return -ENOENT;
 348
 349         dtm_fpga = of_iomap(np, 0);
 350         of_node_put(np);
 351         if (dtm_fpga == NULL)
 352                 return -ENOENT;
 353
 354         /* Must get post info before thread starts. */
 355         warp_post_info();
 356
 357         dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
 358         if (IS_ERR(dtm_thread)) {
 359                 iounmap(dtm_fpga);
 360                 return PTR_ERR(dtm_thread);
 361         }
 362
 363         return 0;
 364 }
 365 machine_late_initcall(warp, pika_dtm_start);
 366
 367 #else /* !CONFIG_SENSORS_AD7414 */
 368
 369 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
 370 {
 371         return 0;
 372 }
 373
 374 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
 375 {
 376         return 0;
 377 }
 378
 379 machine_late_initcall(warp, warp_post_info);
 380
 381 #endif
 382
 383 EXPORT_SYMBOL(pika_dtm_register_shutdown);
 384 EXPORT_SYMBOL(pika_dtm_unregister_shutdown);