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171 lines
3.6 KiB
171 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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* Copyright 2003 by Texas Instruments Incorporated |
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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 <asm/mach-types.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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/* NOTE: most boards don't have a static mapping for the FPGA ... */ |
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struct h2p2_dbg_fpga { |
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/* offset 0x00 */ |
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u16 smc91x[8]; |
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/* offset 0x10 */ |
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u16 fpga_rev; |
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u16 board_rev; |
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u16 gpio_outputs; |
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u16 leds; |
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/* offset 0x18 */ |
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u16 misc_inputs; |
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u16 lan_status; |
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u16 lan_reset; |
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u16 reserved0; |
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/* offset 0x20 */ |
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u16 ps2_data; |
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u16 ps2_ctrl; |
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/* plus also 4 rs232 ports ... */ |
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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 = readw_relaxed(&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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writew_relaxed(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 = readw_relaxed(&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, resource_size(iomem)); |
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writew_relaxed(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 = readw_relaxed(&fpga->leds); |
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writew_relaxed(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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writew_relaxed(~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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