158 lines
3.3 KiB
C
158 lines
3.3 KiB
C
/*
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* linux/arch/arm/plat-omap/debug-leds.c
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*
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* Copyright 2011 by Bryan Wu <bryan.wu@canonical.com>
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* Copyright 2003 by Texas Instruments Incorporated
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/leds.h>
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#include <linux/io.h>
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#include <linux/platform_data/gpio-omap.h>
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#include <linux/slab.h>
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#include <mach/hardware.h>
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#include <asm/mach-types.h>
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#include <plat/fpga.h>
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/* Many OMAP development platforms reuse the same "debug board"; these
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* platforms include H2, H3, H4, and Perseus2. There are 16 LEDs on the
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* debug board (all green), accessed through FPGA registers.
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*/
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static struct h2p2_dbg_fpga __iomem *fpga;
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static u16 fpga_led_state;
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struct dbg_led {
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struct led_classdev cdev;
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u16 mask;
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};
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static const struct {
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const char *name;
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const char *trigger;
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} dbg_leds[] = {
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{ "dbg:d4", "heartbeat", },
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{ "dbg:d5", "cpu0", },
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{ "dbg:d6", "default-on", },
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{ "dbg:d7", },
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{ "dbg:d8", },
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{ "dbg:d9", },
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{ "dbg:d10", },
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{ "dbg:d11", },
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{ "dbg:d12", },
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{ "dbg:d13", },
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{ "dbg:d14", },
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{ "dbg:d15", },
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{ "dbg:d16", },
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{ "dbg:d17", },
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{ "dbg:d18", },
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{ "dbg:d19", },
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};
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/*
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* The triggers lines up below will only be used if the
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* LED triggers are compiled in.
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*/
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static void dbg_led_set(struct led_classdev *cdev,
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enum led_brightness b)
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{
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struct dbg_led *led = container_of(cdev, struct dbg_led, cdev);
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u16 reg;
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reg = __raw_readw(&fpga->leds);
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if (b != LED_OFF)
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reg |= led->mask;
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else
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reg &= ~led->mask;
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__raw_writew(reg, &fpga->leds);
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}
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static enum led_brightness dbg_led_get(struct led_classdev *cdev)
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{
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struct dbg_led *led = container_of(cdev, struct dbg_led, cdev);
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u16 reg;
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reg = __raw_readw(&fpga->leds);
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return (reg & led->mask) ? LED_FULL : LED_OFF;
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}
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static int fpga_probe(struct platform_device *pdev)
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{
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struct resource *iomem;
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int i;
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iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!iomem)
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return -ENODEV;
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fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE);
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__raw_writew(0xff, &fpga->leds);
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for (i = 0; i < ARRAY_SIZE(dbg_leds); i++) {
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struct dbg_led *led;
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led = kzalloc(sizeof(*led), GFP_KERNEL);
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if (!led)
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break;
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led->cdev.name = dbg_leds[i].name;
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led->cdev.brightness_set = dbg_led_set;
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led->cdev.brightness_get = dbg_led_get;
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led->cdev.default_trigger = dbg_leds[i].trigger;
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led->mask = BIT(i);
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if (led_classdev_register(NULL, &led->cdev) < 0) {
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kfree(led);
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break;
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}
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}
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return 0;
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}
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static int fpga_suspend_noirq(struct device *dev)
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{
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fpga_led_state = __raw_readw(&fpga->leds);
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__raw_writew(0xff, &fpga->leds);
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return 0;
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}
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static int fpga_resume_noirq(struct device *dev)
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{
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__raw_writew(~fpga_led_state, &fpga->leds);
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return 0;
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}
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static const struct dev_pm_ops fpga_dev_pm_ops = {
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.suspend_noirq = fpga_suspend_noirq,
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.resume_noirq = fpga_resume_noirq,
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};
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static struct platform_driver led_driver = {
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.driver.name = "omap_dbg_led",
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.driver.pm = &fpga_dev_pm_ops,
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.probe = fpga_probe,
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};
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static int __init fpga_init(void)
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{
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if (machine_is_omap_h4()
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|| machine_is_omap_h3()
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|| machine_is_omap_h2()
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|| machine_is_omap_perseus2()
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)
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return platform_driver_register(&led_driver);
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return 0;
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}
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fs_initcall(fpga_init);
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