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 #include <linux/of_i2c.h>
  20 #include <linux/slab.h>
  21
  22 #include <asm/machdep.h>
  23 #include <asm/prom.h>
  24 #include <asm/udbg.h>
  25 #include <asm/time.h>
  26 #include <asm/uic.h>
  27 #include <asm/ppc4xx.h>
  28
  29
  30 static __initdata struct of_device_id warp_of_bus[] = {
  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 static int __init warp_probe(void)
  45 {
  46         unsigned long root = of_get_flat_dt_root();
  47
  48         if (!of_flat_dt_is_compatible(root, "pika,warp"))
  49                 return 0;
  50
  51         /* For __dma_alloc_coherent */
  52         ISA_DMA_THRESHOLD = ~0L;
  53
  54         return 1;
  55 }
  56
  57 define_machine(warp) {
  58         .name           = "Warp",
  59         .probe          = warp_probe,
  60         .progress       = udbg_progress,
  61         .init_IRQ       = uic_init_tree,
  62         .get_irq        = uic_get_irq,
  63         .restart        = ppc4xx_reset_system,
  64         .calibrate_decr = generic_calibrate_decr,
  65 };
  66
  67
  68 static int __init warp_post_info(void)
  69 {
  70         struct device_node *np;
  71         void __iomem *fpga;
  72         u32 post1, post2;
  73
  74         /* Sighhhh... POST information is in the sd area. */
  75         np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
  76         if (np == NULL)
  77                 return -ENOENT;
  78
  79         fpga = of_iomap(np, 0);
  80         of_node_put(np);
  81         if (fpga == NULL)
  82                 return -ENOENT;
  83
  84         post1 = in_be32(fpga + 0x40);
  85         post2 = in_be32(fpga + 0x44);
  86
  87         iounmap(fpga);
  88
  89         if (post1 || post2)
  90                 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
  91         else
  92                 printk(KERN_INFO "Warp POST OK\n");
  93
  94         return 0;
  95 }
  96
  97
  98 #ifdef CONFIG_SENSORS_AD7414
  99
 100 static LIST_HEAD(dtm_shutdown_list);
 101 static void __iomem *dtm_fpga;
 102 static unsigned green_led, red_led;
 103
 104
 105 struct dtm_shutdown {
 106         struct list_head list;
 107         void (*func)(void *arg);
 108         void *arg;
 109 };
 110
 111
 112 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
 113 {
 114         struct dtm_shutdown *shutdown;
 115
 116         shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
 117         if (shutdown == NULL)
 118                 return -ENOMEM;
 119
 120         shutdown->func = func;
 121         shutdown->arg = arg;
 122
 123         list_add(&shutdown->list, &dtm_shutdown_list);
 124
 125         return 0;
 126 }
 127
 128 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
 129 {
 130         struct dtm_shutdown *shutdown;
 131
 132         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
 133                 if (shutdown->func == func && shutdown->arg == arg) {
 134                         list_del(&shutdown->list);
 135                         kfree(shutdown);
 136                         return 0;
 137                 }
 138
 139         return -EINVAL;
 140 }
 141
 142 static irqreturn_t temp_isr(int irq, void *context)
 143 {
 144         struct dtm_shutdown *shutdown;
 145         int value = 1;
 146
 147         local_irq_disable();
 148
 149         gpio_set_value(green_led, 0);
 150
 151         /* Run through the shutdown list. */
 152         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
 153                 shutdown->func(shutdown->arg);
 154
 155         printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
 156
 157         while (1) {
 158                 if (dtm_fpga) {
 159                         unsigned reset = in_be32(dtm_fpga + 0x14);
 160                         out_be32(dtm_fpga + 0x14, reset);
 161                 }
 162
 163                 gpio_set_value(red_led, value);
 164                 value ^= 1;
 165                 mdelay(500);
 166         }
 167
 168         /* Not reached */
 169         return IRQ_HANDLED;
 170 }
 171
 172 static int pika_setup_leds(void)
 173 {
 174         struct device_node *np, *child;
 175
 176         np = of_find_compatible_node(NULL, NULL, "gpio-leds");
 177         if (!np) {
 178                 printk(KERN_ERR __FILE__ ": Unable to find leds\n");
 179                 return -ENOENT;
 180         }
 181
 182         for_each_child_of_node(np, child)
 183                 if (strcmp(child->name, "green") == 0)
 184                         green_led = of_get_gpio(child, 0);
 185                 else if (strcmp(child->name, "red") == 0)
 186                         red_led = of_get_gpio(child, 0);
 187
 188         of_node_put(np);
 189
 190         return 0;
 191 }
 192
 193 static void pika_setup_critical_temp(struct device_node *np,
 194                                      struct i2c_client *client)
 195 {
 196         int irq, rc;
 197
 198         /* Do this before enabling critical temp interrupt since we
 199          * may immediately interrupt.
 200          */
 201         pika_setup_leds();
 202
 203         /* These registers are in 1 degree increments. */
 204         i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */
 205         i2c_smbus_write_byte_data(client, 3,  0); /* Tlow */
 206
 207         irq = irq_of_parse_and_map(np, 0);
 208         if (irq  == NO_IRQ) {
 209                 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
 210                 return;
 211         }
 212
 213         rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
 214         if (rc) {
 215                 printk(KERN_ERR __FILE__
 216                        ": Unable to request ad7414 irq %d = %d\n", irq, rc);
 217                 return;
 218         }
 219 }
 220
 221 static inline void pika_dtm_check_fan(void __iomem *fpga)
 222 {
 223         static int fan_state;
 224         u32 fan = in_be32(fpga + 0x34) & (1 << 14);
 225
 226         if (fan_state != fan) {
 227                 fan_state = fan;
 228                 if (fan)
 229                         printk(KERN_WARNING "Fan rotation error detected."
 230                                    " Please check hardware.\n");
 231         }
 232 }
 233
 234 static int pika_dtm_thread(void __iomem *fpga)
 235 {
 236         struct device_node *np;
 237         struct i2c_client *client;
 238
 239         np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
 240         if (np == NULL)
 241                 return -ENOENT;
 242
 243         client = of_find_i2c_device_by_node(np);
 244         if (client == NULL) {
 245                 of_node_put(np);
 246                 return -ENOENT;
 247         }
 248
 249         pika_setup_critical_temp(np, client);
 250
 251         of_node_put(np);
 252
 253         printk(KERN_INFO "Warp DTM thread running.\n");
 254
 255         while (!kthread_should_stop()) {
 256                 int val;
 257
 258                 val = i2c_smbus_read_word_data(client, 0);
 259                 if (val < 0)
 260                         dev_dbg(&client->dev, "DTM read temp failed.\n");
 261                 else {
 262                         s16 temp = swab16(val);
 263                         out_be32(fpga + 0x20, temp);
 264                 }
 265
 266                 pika_dtm_check_fan(fpga);
 267
 268                 set_current_state(TASK_INTERRUPTIBLE);
 269                 schedule_timeout(HZ);
 270         }
 271
 272         return 0;
 273 }
 274
 275 static int __init pika_dtm_start(void)
 276 {
 277         struct task_struct *dtm_thread;
 278         struct device_node *np;
 279
 280         np = of_find_compatible_node(NULL, NULL, "pika,fpga");
 281         if (np == NULL)
 282                 return -ENOENT;
 283
 284         dtm_fpga = of_iomap(np, 0);
 285         of_node_put(np);
 286         if (dtm_fpga == NULL)
 287                 return -ENOENT;
 288
 289         /* Must get post info before thread starts. */
 290         warp_post_info();
 291
 292         dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
 293         if (IS_ERR(dtm_thread)) {
 294                 iounmap(dtm_fpga);
 295                 return PTR_ERR(dtm_thread);
 296         }
 297
 298         return 0;
 299 }
 300 machine_late_initcall(warp, pika_dtm_start);
 301
 302 #else /* !CONFIG_SENSORS_AD7414 */
 303
 304 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
 305 {
 306         return 0;
 307 }
 308
 309 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
 310 {
 311         return 0;
 312 }
 313
 314 machine_late_initcall(warp, warp_post_info);
 315
 316 #endif
 317
 318 EXPORT_SYMBOL(pika_dtm_register_shutdown);
 319 EXPORT_SYMBOL(pika_dtm_unregister_shutdown);