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
  21 #include <asm/machdep.h>
  22 #include <asm/prom.h>
  23 #include <asm/udbg.h>
  24 #include <asm/time.h>
  25 #include <asm/uic.h>
  26 #include <asm/ppc4xx.h>
  27
  28
  29 static __initdata struct of_device_id warp_of_bus[] = {
  30         { .compatible = "ibm,plb4", },
  31         { .compatible = "ibm,opb", },
  32         { .compatible = "ibm,ebc", },
  33         {},
  34 };
  35
  36 static int __init warp_device_probe(void)
  37 {
  38         of_platform_bus_probe(NULL, warp_of_bus, NULL);
  39         return 0;
  40 }
  41 machine_device_initcall(warp, warp_device_probe);
  42
  43 static int __init warp_probe(void)
  44 {
  45         unsigned long root = of_get_flat_dt_root();
  46
  47         if (!of_flat_dt_is_compatible(root, "pika,warp"))
  48                 return 0;
  49
  50         /* For __dma_alloc_coherent */
  51         ISA_DMA_THRESHOLD = ~0L;
  52
  53         return 1;
  54 }
  55
  56 define_machine(warp) {
  57         .name           = "Warp",
  58         .probe          = warp_probe,
  59         .progress       = udbg_progress,
  60         .init_IRQ       = uic_init_tree,
  61         .get_irq        = uic_get_irq,
  62         .restart        = ppc4xx_reset_system,
  63         .calibrate_decr = generic_calibrate_decr,
  64 };
  65
  66
  67 static u32 post_info;
  68
  69 static int __init warp_post_info(void)
  70 {
  71         struct device_node *np;
  72         void __iomem *fpga;
  73         u32 post1, post2;
  74
  75         /* Sighhhh... POST information is in the sd area. */
  76         np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
  77         if (np == NULL)
  78                 return -ENOENT;
  79
  80         fpga = of_iomap(np, 0);
  81         of_node_put(np);
  82         if (fpga == NULL)
  83                 return -ENOENT;
  84
  85         post1 = in_be32(fpga + 0x40);
  86         post2 = in_be32(fpga + 0x44);
  87
  88         iounmap(fpga);
  89
  90         if (post1 || post2) {
  91                 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
  92                 post_info = 1;
  93         } else
  94                 printk(KERN_INFO "Warp POST OK\n");
  95
  96         return 0;
  97 }
  98
  99
 100 #ifdef CONFIG_SENSORS_AD7414
 101
 102 static LIST_HEAD(dtm_shutdown_list);
 103 static void __iomem *dtm_fpga;
 104 static unsigned green_led, red_led;
 105
 106
 107 struct dtm_shutdown {
 108         struct list_head list;
 109         void (*func)(void *arg);
 110         void *arg;
 111 };
 112
 113
 114 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
 115 {
 116         struct dtm_shutdown *shutdown;
 117
 118         shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
 119         if (shutdown == NULL)
 120                 return -ENOMEM;
 121
 122         shutdown->func = func;
 123         shutdown->arg = arg;
 124
 125         list_add(&shutdown->list, &dtm_shutdown_list);
 126
 127         return 0;
 128 }
 129
 130 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
 131 {
 132         struct dtm_shutdown *shutdown;
 133
 134         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
 135                 if (shutdown->func == func && shutdown->arg == arg) {
 136                         list_del(&shutdown->list);
 137                         kfree(shutdown);
 138                         return 0;
 139                 }
 140
 141         return -EINVAL;
 142 }
 143
 144 static irqreturn_t temp_isr(int irq, void *context)
 145 {
 146         struct dtm_shutdown *shutdown;
 147         int value = 1;
 148
 149         local_irq_disable();
 150
 151         gpio_set_value(green_led, 0);
 152
 153         /* Run through the shutdown list. */
 154         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
 155                 shutdown->func(shutdown->arg);
 156
 157         printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
 158
 159         while (1) {
 160                 if (dtm_fpga) {
 161                         unsigned reset = in_be32(dtm_fpga + 0x14);
 162                         out_be32(dtm_fpga + 0x14, reset);
 163                 }
 164
 165                 gpio_set_value(red_led, value);
 166                 value ^= 1;
 167                 mdelay(500);
 168         }
 169 }
 170
 171 static int pika_setup_leds(void)
 172 {
 173         struct device_node *np, *child;
 174
 175         np = of_find_compatible_node(NULL, NULL, "gpio-leds");
 176         if (!np) {
 177                 printk(KERN_ERR __FILE__ ": Unable to find leds\n");
 178                 return -ENOENT;
 179         }
 180
 181         for_each_child_of_node(np, child)
 182                 if (strcmp(child->name, "green") == 0) {
 183                         green_led = of_get_gpio(child, 0);
 184                         /* Turn back on the green LED */
 185                         gpio_set_value(green_led, 1);
 186                 } else if (strcmp(child->name, "red") == 0) {
 187                         red_led = of_get_gpio(child, 0);
 188                         /* Set based on post */
 189                         gpio_set_value(red_led, post_info);
 190                 }
 191
 192         of_node_put(np);
 193
 194         return 0;
 195 }
 196
 197 static void pika_setup_critical_temp(struct device_node *np,
 198                                      struct i2c_client *client)
 199 {
 200         int irq, rc;
 201
 202         /* Do this before enabling critical temp interrupt since we
 203          * may immediately interrupt.
 204          */
 205         pika_setup_leds();
 206
 207         /* These registers are in 1 degree increments. */
 208         i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */
 209         i2c_smbus_write_byte_data(client, 3,  0); /* Tlow */
 210
 211         irq = irq_of_parse_and_map(np, 0);
 212         if (irq  == NO_IRQ) {
 213                 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
 214                 return;
 215         }
 216
 217         rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
 218         if (rc) {
 219                 printk(KERN_ERR __FILE__
 220                        ": Unable to request ad7414 irq %d = %d\n", irq, rc);
 221                 return;
 222         }
 223 }
 224
 225 static inline void pika_dtm_check_fan(void __iomem *fpga)
 226 {
 227         static int fan_state;
 228         u32 fan = in_be32(fpga + 0x34) & (1 << 14);
 229
 230         if (fan_state != fan) {
 231                 fan_state = fan;
 232                 if (fan)
 233                         printk(KERN_WARNING "Fan rotation error detected."
 234                                    " Please check hardware.\n");
 235         }
 236 }
 237
 238 static int pika_dtm_thread(void __iomem *fpga)
 239 {
 240         struct device_node *np;
 241         struct i2c_client *client;
 242
 243         np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
 244         if (np == NULL)
 245                 return -ENOENT;
 246
 247         client = of_find_i2c_device_by_node(np);
 248         if (client == NULL) {
 249                 of_node_put(np);
 250                 return -ENOENT;
 251         }
 252
 253         pika_setup_critical_temp(np, client);
 254
 255         of_node_put(np);
 256
 257         printk(KERN_INFO "Warp DTM thread running.\n");
 258
 259         while (!kthread_should_stop()) {
 260                 int val;
 261
 262                 val = i2c_smbus_read_word_data(client, 0);
 263                 if (val < 0)
 264                         dev_dbg(&client->dev, "DTM read temp failed.\n");
 265                 else {
 266                         s16 temp = swab16(val);
 267                         out_be32(fpga + 0x20, temp);
 268                 }
 269
 270                 pika_dtm_check_fan(fpga);
 271
 272                 set_current_state(TASK_INTERRUPTIBLE);
 273                 schedule_timeout(HZ);
 274         }
 275
 276         return 0;
 277 }
 278
 279 static int __init pika_dtm_start(void)
 280 {
 281         struct task_struct *dtm_thread;
 282         struct device_node *np;
 283
 284         np = of_find_compatible_node(NULL, NULL, "pika,fpga");
 285         if (np == NULL)
 286                 return -ENOENT;
 287
 288         dtm_fpga = of_iomap(np, 0);
 289         of_node_put(np);
 290         if (dtm_fpga == NULL)
 291                 return -ENOENT;
 292
 293         /* Must get post info before thread starts. */
 294         warp_post_info();
 295
 296         dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
 297         if (IS_ERR(dtm_thread)) {
 298                 iounmap(dtm_fpga);
 299                 return PTR_ERR(dtm_thread);
 300         }
 301
 302         return 0;
 303 }
 304 machine_late_initcall(warp, pika_dtm_start);
 305
 306 #else /* !CONFIG_SENSORS_AD7414 */
 307
 308 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
 309 {
 310         return 0;
 311 }
 312
 313 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
 314 {
 315         return 0;
 316 }
 317
 318 machine_late_initcall(warp, warp_post_info);
 319
 320 #endif
 321
 322 EXPORT_SYMBOL(pika_dtm_register_shutdown);
 323 EXPORT_SYMBOL(pika_dtm_unregister_shutdown);