319 lines
6.4 KiB
C
319 lines
6.4 KiB
C
/*
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* PIKA Warp(tm) board specific routines
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*
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* Copyright (c) 2008-2009 PIKA Technologies
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* Sean MacLennan <smaclennan@pikatech.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/of_platform.h>
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#include <linux/kthread.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/of_gpio.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <asm/machdep.h>
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#include <asm/prom.h>
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#include <asm/udbg.h>
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#include <asm/time.h>
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#include <asm/uic.h>
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#include <asm/ppc4xx.h>
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#include <asm/dma.h>
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static const struct of_device_id warp_of_bus[] __initconst = {
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{ .compatible = "ibm,plb4", },
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{ .compatible = "ibm,opb", },
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{ .compatible = "ibm,ebc", },
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{},
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};
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static int __init warp_device_probe(void)
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{
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of_platform_bus_probe(NULL, warp_of_bus, NULL);
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return 0;
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}
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machine_device_initcall(warp, warp_device_probe);
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static int __init warp_probe(void)
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{
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if (!of_machine_is_compatible("pika,warp"))
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return 0;
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/* For __dma_alloc_coherent */
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ISA_DMA_THRESHOLD = ~0L;
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return 1;
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}
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define_machine(warp) {
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.name = "Warp",
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.probe = warp_probe,
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.progress = udbg_progress,
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.init_IRQ = uic_init_tree,
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.get_irq = uic_get_irq,
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.restart = ppc4xx_reset_system,
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.calibrate_decr = generic_calibrate_decr,
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};
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static int __init warp_post_info(void)
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{
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struct device_node *np;
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void __iomem *fpga;
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u32 post1, post2;
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/* Sighhhh... POST information is in the sd area. */
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np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
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if (np == NULL)
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return -ENOENT;
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fpga = of_iomap(np, 0);
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of_node_put(np);
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if (fpga == NULL)
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return -ENOENT;
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post1 = in_be32(fpga + 0x40);
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post2 = in_be32(fpga + 0x44);
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iounmap(fpga);
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if (post1 || post2)
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printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
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else
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printk(KERN_INFO "Warp POST OK\n");
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return 0;
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}
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#ifdef CONFIG_SENSORS_AD7414
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static LIST_HEAD(dtm_shutdown_list);
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static void __iomem *dtm_fpga;
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static unsigned green_led, red_led;
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struct dtm_shutdown {
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struct list_head list;
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void (*func)(void *arg);
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void *arg;
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};
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int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
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{
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struct dtm_shutdown *shutdown;
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shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
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if (shutdown == NULL)
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return -ENOMEM;
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shutdown->func = func;
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shutdown->arg = arg;
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list_add(&shutdown->list, &dtm_shutdown_list);
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return 0;
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}
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int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
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{
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struct dtm_shutdown *shutdown;
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list_for_each_entry(shutdown, &dtm_shutdown_list, list)
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if (shutdown->func == func && shutdown->arg == arg) {
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list_del(&shutdown->list);
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kfree(shutdown);
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return 0;
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}
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return -EINVAL;
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}
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static irqreturn_t temp_isr(int irq, void *context)
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{
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struct dtm_shutdown *shutdown;
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int value = 1;
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local_irq_disable();
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gpio_set_value(green_led, 0);
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/* Run through the shutdown list. */
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list_for_each_entry(shutdown, &dtm_shutdown_list, list)
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shutdown->func(shutdown->arg);
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printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
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while (1) {
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if (dtm_fpga) {
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unsigned reset = in_be32(dtm_fpga + 0x14);
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out_be32(dtm_fpga + 0x14, reset);
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}
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gpio_set_value(red_led, value);
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value ^= 1;
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mdelay(500);
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}
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/* Not reached */
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return IRQ_HANDLED;
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}
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static int pika_setup_leds(void)
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{
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struct device_node *np, *child;
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np = of_find_compatible_node(NULL, NULL, "gpio-leds");
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if (!np) {
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printk(KERN_ERR __FILE__ ": Unable to find leds\n");
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return -ENOENT;
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}
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for_each_child_of_node(np, child)
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if (strcmp(child->name, "green") == 0)
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green_led = of_get_gpio(child, 0);
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else if (strcmp(child->name, "red") == 0)
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red_led = of_get_gpio(child, 0);
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of_node_put(np);
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return 0;
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}
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static void pika_setup_critical_temp(struct device_node *np,
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struct i2c_client *client)
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{
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int irq, rc;
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/* Do this before enabling critical temp interrupt since we
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* may immediately interrupt.
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*/
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pika_setup_leds();
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/* These registers are in 1 degree increments. */
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i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */
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i2c_smbus_write_byte_data(client, 3, 0); /* Tlow */
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irq = irq_of_parse_and_map(np, 0);
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if (!irq) {
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printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
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return;
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}
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rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
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if (rc) {
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printk(KERN_ERR __FILE__
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": Unable to request ad7414 irq %d = %d\n", irq, rc);
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return;
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}
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}
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static inline void pika_dtm_check_fan(void __iomem *fpga)
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{
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static int fan_state;
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u32 fan = in_be32(fpga + 0x34) & (1 << 14);
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if (fan_state != fan) {
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fan_state = fan;
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if (fan)
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printk(KERN_WARNING "Fan rotation error detected."
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" Please check hardware.\n");
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}
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}
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static int pika_dtm_thread(void __iomem *fpga)
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{
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struct device_node *np;
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struct i2c_client *client;
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np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
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if (np == NULL)
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return -ENOENT;
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client = of_find_i2c_device_by_node(np);
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if (client == NULL) {
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of_node_put(np);
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return -ENOENT;
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}
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pika_setup_critical_temp(np, client);
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of_node_put(np);
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printk(KERN_INFO "Warp DTM thread running.\n");
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while (!kthread_should_stop()) {
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int val;
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val = i2c_smbus_read_word_data(client, 0);
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if (val < 0)
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dev_dbg(&client->dev, "DTM read temp failed.\n");
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else {
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s16 temp = swab16(val);
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out_be32(fpga + 0x20, temp);
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}
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pika_dtm_check_fan(fpga);
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set_current_state(TASK_INTERRUPTIBLE);
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schedule_timeout(HZ);
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}
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return 0;
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}
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static int __init pika_dtm_start(void)
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{
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struct task_struct *dtm_thread;
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struct device_node *np;
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np = of_find_compatible_node(NULL, NULL, "pika,fpga");
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if (np == NULL)
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return -ENOENT;
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dtm_fpga = of_iomap(np, 0);
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of_node_put(np);
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if (dtm_fpga == NULL)
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return -ENOENT;
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/* Must get post info before thread starts. */
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warp_post_info();
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dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
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if (IS_ERR(dtm_thread)) {
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iounmap(dtm_fpga);
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return PTR_ERR(dtm_thread);
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}
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return 0;
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}
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machine_late_initcall(warp, pika_dtm_start);
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#else /* !CONFIG_SENSORS_AD7414 */
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int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
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{
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return 0;
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}
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int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
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{
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return 0;
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}
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machine_late_initcall(warp, warp_post_info);
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#endif
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EXPORT_SYMBOL(pika_dtm_register_shutdown);
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EXPORT_SYMBOL(pika_dtm_unregister_shutdown);
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