arch/powerpc/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/init.h>
   9 #include <linux/of_platform.h>
  10 #include <linux/kthread.h>
  11 #include <linux/i2c.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/delay.h>
  14 #include <linux/of_address.h>
  15 #include <linux/of_irq.h>
  16 #include <linux/of_gpio.h>
  17 #include <linux/slab.h>
  18 #include <linux/export.h>
  19
  20 #include <asm/machdep.h>
  21 #include <asm/udbg.h>
  22 #include <asm/time.h>
  23 #include <asm/uic.h>
  24 #include <asm/ppc4xx.h>
  25 #include <asm/dma.h>
  26
  27
  28 static const struct of_device_id warp_of_bus[] __initconst = {
  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         if (!of_machine_is_compatible("pika,warp"))
  45                 return 0;
  46
  47         return 1;
  48 }
  49
  50 define_machine(warp) {
  51         .name           = "Warp",
  52         .probe          = warp_probe,
  53         .progress       = udbg_progress,
  54         .init_IRQ       = uic_init_tree,
  55         .get_irq        = uic_get_irq,
  56         .restart        = ppc4xx_reset_system,
  57         .calibrate_decr = generic_calibrate_decr,
  58 };
  59
  60
  61 static int __init warp_post_info(void)
  62 {
  63         struct device_node *np;
  64         void __iomem *fpga;
  65         u32 post1, post2;
  66
  67         /* Sighhhh... POST information is in the sd area. */
  68         np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
  69         if (np == NULL)
  70                 return -ENOENT;
  71
  72         fpga = of_iomap(np, 0);
  73         of_node_put(np);
  74         if (fpga == NULL)
  75                 return -ENOENT;
  76
  77         post1 = in_be32(fpga + 0x40);
  78         post2 = in_be32(fpga + 0x44);
  79
  80         iounmap(fpga);
  81
  82         if (post1 || post2)
  83                 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
  84         else
  85                 printk(KERN_INFO "Warp POST OK\n");
  86
  87         return 0;
  88 }
  89
  90
  91 #ifdef CONFIG_SENSORS_AD7414
  92
  93 static LIST_HEAD(dtm_shutdown_list);
  94 static void __iomem *dtm_fpga;
  95 static unsigned green_led, red_led;
  96
  97
  98 struct dtm_shutdown {
  99         struct list_head list;
 100         void (*func)(void *arg);
 101         void *arg;
 102 };
 103
 104
 105 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
 106 {
 107         struct dtm_shutdown *shutdown;
 108
 109         shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
 110         if (shutdown == NULL)
 111                 return -ENOMEM;
 112
 113         shutdown->func = func;
 114         shutdown->arg = arg;
 115
 116         list_add(&shutdown->list, &dtm_shutdown_list);
 117
 118         return 0;
 119 }
 120
 121 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
 122 {
 123         struct dtm_shutdown *shutdown;
 124
 125         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
 126                 if (shutdown->func == func && shutdown->arg == arg) {
 127                         list_del(&shutdown->list);
 128                         kfree(shutdown);
 129                         return 0;
 130                 }
 131
 132         return -EINVAL;
 133 }
 134
 135 static irqreturn_t temp_isr(int irq, void *context)
 136 {
 137         struct dtm_shutdown *shutdown;
 138         int value = 1;
 139
 140         local_irq_disable();
 141
 142         gpio_set_value(green_led, 0);
 143
 144         /* Run through the shutdown list. */
 145         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
 146                 shutdown->func(shutdown->arg);
 147
 148         printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
 149
 150         while (1) {
 151                 if (dtm_fpga) {
 152                         unsigned reset = in_be32(dtm_fpga + 0x14);
 153                         out_be32(dtm_fpga + 0x14, reset);
 154                 }
 155
 156                 gpio_set_value(red_led, value);
 157                 value ^= 1;
 158                 mdelay(500);
 159         }
 160
 161         /* Not reached */
 162         return IRQ_HANDLED;
 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 (of_node_name_eq(child, "green"))
 177                         green_led = of_get_gpio(child, 0);
 178                 else if (of_node_name_eq(child, "red"))
 179                         red_led = of_get_gpio(child, 0);
 180
 181         of_node_put(np);
 182
 183         return 0;
 184 }
 185
 186 static void pika_setup_critical_temp(struct device_node *np,
 187                                      struct i2c_client *client)
 188 {
 189         int irq, rc;
 190
 191         /* Do this before enabling critical temp interrupt since we
 192          * may immediately interrupt.
 193          */
 194         pika_setup_leds();
 195
 196         /* These registers are in 1 degree increments. */
 197         i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */
 198         i2c_smbus_write_byte_data(client, 3,  0); /* Tlow */
 199
 200         irq = irq_of_parse_and_map(np, 0);
 201         if (!irq) {
 202                 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
 203                 return;
 204         }
 205
 206         rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
 207         if (rc) {
 208                 printk(KERN_ERR __FILE__
 209                        ": Unable to request ad7414 irq %d = %d\n", irq, rc);
 210                 return;
 211         }
 212 }
 213
 214 static inline void pika_dtm_check_fan(void __iomem *fpga)
 215 {
 216         static int fan_state;
 217         u32 fan = in_be32(fpga + 0x34) & (1 << 14);
 218
 219         if (fan_state != fan) {
 220                 fan_state = fan;
 221                 if (fan)
 222                         printk(KERN_WARNING "Fan rotation error detected."
 223                                    " Please check hardware.\n");
 224         }
 225 }
 226
 227 static int pika_dtm_thread(void __iomem *fpga)
 228 {
 229         struct device_node *np;
 230         struct i2c_client *client;
 231
 232         np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
 233         if (np == NULL)
 234                 return -ENOENT;
 235
 236         client = of_find_i2c_device_by_node(np);
 237         if (client == NULL) {
 238                 of_node_put(np);
 239                 return -ENOENT;
 240         }
 241
 242         pika_setup_critical_temp(np, client);
 243
 244         of_node_put(np);
 245
 246         printk(KERN_INFO "Warp DTM thread running.\n");
 247
 248         while (!kthread_should_stop()) {
 249                 int val;
 250
 251                 val = i2c_smbus_read_word_data(client, 0);
 252                 if (val < 0)
 253                         dev_dbg(&client->dev, "DTM read temp failed.\n");
 254                 else {
 255                         s16 temp = swab16(val);
 256                         out_be32(fpga + 0x20, temp);
 257                 }
 258
 259                 pika_dtm_check_fan(fpga);
 260
 261                 set_current_state(TASK_INTERRUPTIBLE);
 262                 schedule_timeout(HZ);
 263         }
 264
 265         return 0;
 266 }
 267
 268 static int __init pika_dtm_start(void)
 269 {
 270         struct task_struct *dtm_thread;
 271         struct device_node *np;
 272
 273         np = of_find_compatible_node(NULL, NULL, "pika,fpga");
 274         if (np == NULL)
 275                 return -ENOENT;
 276
 277         dtm_fpga = of_iomap(np, 0);
 278         of_node_put(np);
 279         if (dtm_fpga == NULL)
 280                 return -ENOENT;
 281
 282         /* Must get post info before thread starts. */
 283         warp_post_info();
 284
 285         dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
 286         if (IS_ERR(dtm_thread)) {
 287                 iounmap(dtm_fpga);
 288                 return PTR_ERR(dtm_thread);
 289         }
 290
 291         return 0;
 292 }
 293 machine_late_initcall(warp, pika_dtm_start);
 294
 295 #else /* !CONFIG_SENSORS_AD7414 */
 296
 297 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
 298 {
 299         return 0;
 300 }
 301
 302 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
 303 {
 304         return 0;
 305 }
 306
 307 machine_late_initcall(warp, warp_post_info);
 308
 309 #endif
 310
 311 EXPORT_SYMBOL(pika_dtm_register_shutdown);
 312 EXPORT_SYMBOL(pika_dtm_unregister_shutdown);