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/slab.h>
  20 #include <linux/export.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 #include <asm/dma.h>
  29
  30
  31 static const struct of_device_id warp_of_bus[] __initconst = {
  32         { .compatible = "ibm,plb4", },
  33         { .compatible = "ibm,opb", },
  34         { .compatible = "ibm,ebc", },
  35         {},
  36 };
  37
  38 static int __init warp_device_probe(void)
  39 {
  40         of_platform_bus_probe(NULL, warp_of_bus, NULL);
  41         return 0;
  42 }
  43 machine_device_initcall(warp, warp_device_probe);
  44
  45 static int __init warp_probe(void)
  46 {
  47         if (!of_machine_is_compatible("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 int __init warp_post_info(void)
  68 {
  69         struct device_node *np;
  70         void __iomem *fpga;
  71         u32 post1, post2;
  72
  73         /* Sighhhh... POST information is in the sd area. */
  74         np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
  75         if (np == NULL)
  76                 return -ENOENT;
  77
  78         fpga = of_iomap(np, 0);
  79         of_node_put(np);
  80         if (fpga == NULL)
  81                 return -ENOENT;
  82
  83         post1 = in_be32(fpga + 0x40);
  84         post2 = in_be32(fpga + 0x44);
  85
  86         iounmap(fpga);
  87
  88         if (post1 || post2)
  89                 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
  90         else
  91                 printk(KERN_INFO "Warp POST OK\n");
  92
  93         return 0;
  94 }
  95
  96
  97 #ifdef CONFIG_SENSORS_AD7414
  98
  99 static LIST_HEAD(dtm_shutdown_list);
 100 static void __iomem *dtm_fpga;
 101 static unsigned green_led, red_led;
 102
 103
 104 struct dtm_shutdown {
 105         struct list_head list;
 106         void (*func)(void *arg);
 107         void *arg;
 108 };
 109
 110
 111 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
 112 {
 113         struct dtm_shutdown *shutdown;
 114
 115         shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
 116         if (shutdown == NULL)
 117                 return -ENOMEM;
 118
 119         shutdown->func = func;
 120         shutdown->arg = arg;
 121
 122         list_add(&shutdown->list, &dtm_shutdown_list);
 123
 124         return 0;
 125 }
 126
 127 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
 128 {
 129         struct dtm_shutdown *shutdown;
 130
 131         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
 132                 if (shutdown->func == func && shutdown->arg == arg) {
 133                         list_del(&shutdown->list);
 134                         kfree(shutdown);
 135                         return 0;
 136                 }
 137
 138         return -EINVAL;
 139 }
 140
 141 static irqreturn_t temp_isr(int irq, void *context)
 142 {
 143         struct dtm_shutdown *shutdown;
 144         int value = 1;
 145
 146         local_irq_disable();
 147
 148         gpio_set_value(green_led, 0);
 149
 150         /* Run through the shutdown list. */
 151         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
 152                 shutdown->func(shutdown->arg);
 153
 154         printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
 155
 156         while (1) {
 157                 if (dtm_fpga) {
 158                         unsigned reset = in_be32(dtm_fpga + 0x14);
 159                         out_be32(dtm_fpga + 0x14, reset);
 160                 }
 161
 162                 gpio_set_value(red_led, value);
 163                 value ^= 1;
 164                 mdelay(500);
 165         }
 166
 167         /* Not reached */
 168         return IRQ_HANDLED;
 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                 else if (strcmp(child->name, "red") == 0)
 185                         red_led = of_get_gpio(child, 0);
 186
 187         of_node_put(np);
 188
 189         return 0;
 190 }
 191
 192 static void pika_setup_critical_temp(struct device_node *np,
 193                                      struct i2c_client *client)
 194 {
 195         int irq, rc;
 196
 197         /* Do this before enabling critical temp interrupt since we
 198          * may immediately interrupt.
 199          */
 200         pika_setup_leds();
 201
 202         /* These registers are in 1 degree increments. */
 203         i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */
 204         i2c_smbus_write_byte_data(client, 3,  0); /* Tlow */
 205
 206         irq = irq_of_parse_and_map(np, 0);
 207         if (!irq) {
 208                 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
 209                 return;
 210         }
 211
 212         rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
 213         if (rc) {
 214                 printk(KERN_ERR __FILE__
 215                        ": Unable to request ad7414 irq %d = %d\n", irq, rc);
 216                 return;
 217         }
 218 }
 219
 220 static inline void pika_dtm_check_fan(void __iomem *fpga)
 221 {
 222         static int fan_state;
 223         u32 fan = in_be32(fpga + 0x34) & (1 << 14);
 224
 225         if (fan_state != fan) {
 226                 fan_state = fan;
 227                 if (fan)
 228                         printk(KERN_WARNING "Fan rotation error detected."
 229                                    " Please check hardware.\n");
 230         }
 231 }
 232
 233 static int pika_dtm_thread(void __iomem *fpga)
 234 {
 235         struct device_node *np;
 236         struct i2c_client *client;
 237
 238         np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
 239         if (np == NULL)
 240                 return -ENOENT;
 241
 242         client = of_find_i2c_device_by_node(np);
 243         if (client == NULL) {
 244                 of_node_put(np);
 245                 return -ENOENT;
 246         }
 247
 248         pika_setup_critical_temp(np, client);
 249
 250         of_node_put(np);
 251
 252         printk(KERN_INFO "Warp DTM thread running.\n");
 253
 254         while (!kthread_should_stop()) {
 255                 int val;
 256
 257                 val = i2c_smbus_read_word_data(client, 0);
 258                 if (val < 0)
 259                         dev_dbg(&client->dev, "DTM read temp failed.\n");
 260                 else {
 261                         s16 temp = swab16(val);
 262                         out_be32(fpga + 0x20, temp);
 263                 }
 264
 265                 pika_dtm_check_fan(fpga);
 266
 267                 set_current_state(TASK_INTERRUPTIBLE);
 268                 schedule_timeout(HZ);
 269         }
 270
 271         return 0;
 272 }
 273
 274 static int __init pika_dtm_start(void)
 275 {
 276         struct task_struct *dtm_thread;
 277         struct device_node *np;
 278
 279         np = of_find_compatible_node(NULL, NULL, "pika,fpga");
 280         if (np == NULL)
 281                 return -ENOENT;
 282
 283         dtm_fpga = of_iomap(np, 0);
 284         of_node_put(np);
 285         if (dtm_fpga == NULL)
 286                 return -ENOENT;
 287
 288         /* Must get post info before thread starts. */
 289         warp_post_info();
 290
 291         dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
 292         if (IS_ERR(dtm_thread)) {
 293                 iounmap(dtm_fpga);
 294                 return PTR_ERR(dtm_thread);
 295         }
 296
 297         return 0;
 298 }
 299 machine_late_initcall(warp, pika_dtm_start);
 300
 301 #else /* !CONFIG_SENSORS_AD7414 */
 302
 303 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
 304 {
 305         return 0;
 306 }
 307
 308 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
 309 {
 310         return 0;
 311 }
 312
 313 machine_late_initcall(warp, warp_post_info);
 314
 315 #endif
 316
 317 EXPORT_SYMBOL(pika_dtm_register_shutdown);
 318 EXPORT_SYMBOL(pika_dtm_unregister_shutdown);