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311 lines
6.1 KiB
311 lines
6.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 <[email protected]> |
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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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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 (of_node_name_eq(child, "green")) |
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green_led = of_get_gpio(child, 0); |
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else if (of_node_name_eq(child, "red")) |
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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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