arch/powerpc/platforms/44x/warp.c

   1 /*
   2  * PIKA Warp(tm) board specific routines
   3  *
   4  * Copyright (c) 2008-2009 PIKA Technologies
   5  *   Sean MacLennan <smaclennan@pikatech.com>
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  */
  12 #include <linux/init.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/kthread.h>
  15 #include <linux/i2c.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/delay.h>
  18 #include <linux/of_gpio.h>
  19
  20 #include <asm/machdep.h>
  21 #include <asm/prom.h>
  22 #include <asm/udbg.h>
  23 #include <asm/time.h>
  24 #include <asm/uic.h>
  25 #include <asm/ppc4xx.h>
  26
  27
  28 static __initdata struct of_device_id warp_of_bus[] = {
  29         { .compatible = "ibm,plb4", },
  30         { .compatible = "ibm,opb", },
  31         { .compatible = "ibm,ebc", },
  32         {},
  33 };
  34
  35 static int __init warp_device_probe(void)
  36 {
  37         of_platform_bus_probe(NULL, warp_of_bus, NULL);
  38         return 0;
  39 }
  40 machine_device_initcall(warp, warp_device_probe);
  41
  42 static int __init warp_probe(void)
  43 {
  44         unsigned long root = of_get_flat_dt_root();
  45
  46         return of_flat_dt_is_compatible(root, "pika,warp");
  47 }
  48
  49 define_machine(warp) {
  50         .name           = "Warp",
  51         .probe          = warp_probe,
  52         .progress       = udbg_progress,
  53         .init_IRQ       = uic_init_tree,
  54         .get_irq        = uic_get_irq,
  55         .restart        = ppc4xx_reset_system,
  56         .calibrate_decr = generic_calibrate_decr,
  57 };
  58
  59
  60 static u32 post_info;
  61
  62 /* I am not sure this is the best place for this... */
  63 static int __init warp_post_info(void)
  64 {
  65         struct device_node *np;
  66         void __iomem *fpga;
  67         u32 post1, post2;
  68
  69         /* Sighhhh... POST information is in the sd area. */
  70         np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
  71         if (np == NULL)
  72                 return -ENOENT;
  73
  74         fpga = of_iomap(np, 0);
  75         of_node_put(np);
  76         if (fpga == NULL)
  77                 return -ENOENT;
  78
  79         post1 = in_be32(fpga + 0x40);
  80         post2 = in_be32(fpga + 0x44);
  81
  82         iounmap(fpga);
  83
  84         if (post1 || post2) {
  85                 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
  86                 post_info = 1;
  87         } else
  88                 printk(KERN_INFO "Warp POST OK\n");
  89
  90         return 0;
  91 }
  92
  93
  94 #ifdef CONFIG_SENSORS_AD7414
  95
  96 static LIST_HEAD(dtm_shutdown_list);
  97 static void __iomem *dtm_fpga;
  98 static unsigned green_led, red_led;
  99
 100
 101 struct dtm_shutdown {
 102         struct list_head list;
 103         void (*func)(void *arg);
 104         void *arg;
 105 };
 106
 107
 108 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
 109 {
 110         struct dtm_shutdown *shutdown;
 111
 112         shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
 113         if (shutdown == NULL)
 114                 return -ENOMEM;
 115
 116         shutdown->func = func;
 117         shutdown->arg = arg;
 118
 119         list_add(&shutdown->list, &dtm_shutdown_list);
 120
 121         return 0;
 122 }
 123
 124 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
 125 {
 126         struct dtm_shutdown *shutdown;
 127
 128         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
 129                 if (shutdown->func == func && shutdown->arg == arg) {
 130                         list_del(&shutdown->list);
 131                         kfree(shutdown);
 132                         return 0;
 133                 }
 134
 135         return -EINVAL;
 136 }
 137
 138 static irqreturn_t temp_isr(int irq, void *context)
 139 {
 140         struct dtm_shutdown *shutdown;
 141         int value = 1;
 142
 143         local_irq_disable();
 144
 145         gpio_set_value(green_led, 0);
 146
 147         /* Run through the shutdown list. */
 148         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
 149                 shutdown->func(shutdown->arg);
 150
 151         printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
 152
 153         while (1) {
 154                 if (dtm_fpga) {
 155                         unsigned reset = in_be32(dtm_fpga + 0x14);
 156                         out_be32(dtm_fpga + 0x14, reset);
 157                 }
 158
 159                 gpio_set_value(red_led, value);
 160                 value ^= 1;
 161                 mdelay(500);
 162         }
 163 }
 164
 165 static int pika_setup_leds(void)
 166 {
 167         struct device_node *np, *child;
 168
 169         np = of_find_compatible_node(NULL, NULL, "gpio-leds");
 170         if (!np) {
 171                 printk(KERN_ERR __FILE__ ": Unable to find leds\n");
 172                 return -ENOENT;
 173         }
 174
 175         for_each_child_of_node(np, child)
 176                 if (strcmp(child->name, "green") == 0) {
 177                         green_led = of_get_gpio(child, 0);
 178                         /* Turn back on the green LED */
 179                         gpio_set_value(green_led, 1);
 180                 } else if (strcmp(child->name, "red") == 0) {
 181                         red_led = of_get_gpio(child, 0);
 182                         /* Set based on post */
 183                         gpio_set_value(red_led, post_info);
 184                 }
 185
 186         of_node_put(np);
 187
 188         return 0;
 189 }
 190
 191 static void pika_setup_critical_temp(struct i2c_client *client)
 192 {
 193         struct device_node *np;
 194         int irq, rc;
 195
 196         /* Do this before enabling critical temp interrupt since we
 197          * may immediately interrupt.
 198          */
 199         pika_setup_leds();
 200
 201         /* These registers are in 1 degree increments. */
 202         i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */
 203         i2c_smbus_write_byte_data(client, 3,  0); /* Tlow */
 204
 205         np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
 206         if (np == NULL) {
 207                 printk(KERN_ERR __FILE__ ": Unable to find ad7414\n");
 208                 return;
 209         }
 210
 211         irq = irq_of_parse_and_map(np, 0);
 212         of_node_put(np);
 213         if (irq  == NO_IRQ) {
 214                 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
 215                 return;
 216         }
 217
 218         rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
 219         if (rc) {
 220                 printk(KERN_ERR __FILE__
 221                        ": Unable to request ad7414 irq %d = %d\n", irq, rc);
 222                 return;
 223         }
 224 }
 225
 226 static inline void pika_dtm_check_fan(void __iomem *fpga)
 227 {
 228         static int fan_state;
 229         u32 fan = in_be32(fpga + 0x34) & (1 << 14);
 230
 231         if (fan_state != fan) {
 232                 fan_state = fan;
 233                 if (fan)
 234                         printk(KERN_WARNING "Fan rotation error detected."
 235                                    " Please check hardware.\n");
 236         }
 237 }
 238
 239 static int pika_dtm_thread(void __iomem *fpga)
 240 {
 241         struct i2c_adapter *adap;
 242         struct i2c_client *client;
 243
 244         /* We loop in case either driver was compiled as a module and
 245          * has not been insmoded yet.
 246          */
 247         while (!(adap = i2c_get_adapter(0))) {
 248                 set_current_state(TASK_INTERRUPTIBLE);
 249                 schedule_timeout(HZ);
 250         }
 251
 252         while (1) {
 253                 list_for_each_entry(client, &adap->clients, list)
 254                         if (client->addr == 0x4a)
 255                                 goto found_it;
 256
 257                 set_current_state(TASK_INTERRUPTIBLE);
 258                 schedule_timeout(HZ);
 259         }
 260
 261 found_it:
 262         pika_setup_critical_temp(client);
 263
 264         i2c_put_adapter(adap);
 265
 266         printk(KERN_INFO "PIKA DTM thread running.\n");
 267
 268         while (!kthread_should_stop()) {
 269                 int val;
 270
 271                 val = i2c_smbus_read_word_data(client, 0);
 272                 if (val < 0)
 273                         dev_dbg(&client->dev, "DTM read temp failed.\n");
 274                 else {
 275                         s16 temp = swab16(val);
 276                         out_be32(fpga + 0x20, temp);
 277                 }
 278
 279                 pika_dtm_check_fan(fpga);
 280
 281                 set_current_state(TASK_INTERRUPTIBLE);
 282                 schedule_timeout(HZ);
 283         }
 284
 285         return 0;
 286 }
 287
 288
 289 static int __init pika_dtm_start(void)
 290 {
 291         struct task_struct *dtm_thread;
 292         struct device_node *np;
 293
 294         np = of_find_compatible_node(NULL, NULL, "pika,fpga");
 295         if (np == NULL)
 296                 return -ENOENT;
 297
 298         dtm_fpga = of_iomap(np, 0);
 299         of_node_put(np);
 300         if (dtm_fpga == NULL)
 301                 return -ENOENT;
 302
 303         /* Must get post info before thread starts. */
 304         warp_post_info();
 305
 306         dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
 307         if (IS_ERR(dtm_thread)) {
 308                 iounmap(dtm_fpga);
 309                 return PTR_ERR(dtm_thread);
 310         }
 311
 312         return 0;
 313 }
 314 machine_late_initcall(warp, pika_dtm_start);
 315
 316 #else /* !CONFIG_SENSORS_AD7414 */
 317
 318 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
 319 {
 320         return 0;
 321 }
 322
 323 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
 324 {
 325         return 0;
 326 }
 327
 328 machine_late_initcall(warp, warp_post_info);
 329
 330 #endif
 331
 332 EXPORT_SYMBOL(pika_dtm_register_shutdown);
 333 EXPORT_SYMBOL(pika_dtm_unregister_shutdown);