Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 555 insertions, 0 deletions

diff --git a/drivers/parisc/led.c b/drivers/parisc/led.c
new file mode 100644
index 0000000000..1f75d24160
--- /dev/null
+++ b/drivers/parisc/led.c
@@ -0,0 +1,555 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *	Chassis LCD/LED driver for HP-PARISC workstations
+ *
+ *	(c) Copyright 2000 Red Hat Software
+ *	(c) Copyright 2000 Helge Deller <hdeller@redhat.com>
+ *	(c) Copyright 2001 Randolph Chung <tausq@debian.org>
+ *	(c) Copyright 2000-2023 Helge Deller <deller@gmx.de>
+ *
+ *	The control of the LEDs and LCDs on PARISC machines has to be done
+ *	completely in software.
+ *
+ *	The LEDs can be configured at runtime in /sys/class/leds/
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/ioport.h>
+#include <linux/utsname.h>
+#include <linux/capability.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/uaccess.h>
+#include <linux/leds.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <asm/hardware.h>
+#include <asm/param.h>		/* HZ */
+#include <asm/led.h>
+#include <asm/pdc.h>
+
+#define LED_HAS_LCD 1
+#define LED_HAS_LED 2
+
+static unsigned char led_type;		/* bitmask of LED_HAS_XXX */
+static unsigned char lastleds;		/* LED state from most recent update */
+static unsigned char lcd_new_text;
+static unsigned char lcd_text[20];
+static unsigned char lcd_text_default[20];
+static unsigned char lcd_no_led_support; /* KittyHawk doesn't support LED on its LCD */
+
+struct lcd_block {
+	unsigned char command;	/* stores the command byte      */
+	unsigned char on;	/* value for turning LED on     */
+	unsigned char off;	/* value for turning LED off    */
+};
+
+/* Structure returned by PDC_RETURN_CHASSIS_INFO */
+/* NOTE: we use unsigned long:16 two times, since the following member
+   lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */
+struct pdc_chassis_lcd_info_ret_block {
+	unsigned long model:16;		/* DISPLAY_MODEL_XXXX */
+	unsigned long lcd_width:16;	/* width of the LCD in chars (DISPLAY_MODEL_LCD only) */
+	unsigned long lcd_cmd_reg_addr;	/* ptr to LCD cmd-register & data ptr for LED */
+	unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */
+	unsigned int min_cmd_delay;	/* delay in uS after cmd-write (LCD only) */
+	unsigned char reset_cmd1;	/* command #1 for writing LCD string (LCD only) */
+	unsigned char reset_cmd2;	/* command #2 for writing LCD string (LCD only) */
+	unsigned char act_enable;	/* 0 = no activity (LCD only) */
+	struct lcd_block heartbeat;
+	struct lcd_block disk_io;
+	struct lcd_block lan_rcv;
+	struct lcd_block lan_tx;
+	char _pad;
+};
+
+
+/* LCD_CMD and LCD_DATA for KittyHawk machines */
+#define KITTYHAWK_LCD_CMD  F_EXTEND(0xf0190000UL)
+#define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD + 1)
+
+/* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's
+ * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */
+static struct pdc_chassis_lcd_info_ret_block
+lcd_info __attribute__((aligned(8)))  =
+{
+	.model =		DISPLAY_MODEL_NONE,
+	.lcd_width =		16,
+	.lcd_cmd_reg_addr =	KITTYHAWK_LCD_CMD,
+	.lcd_data_reg_addr =	KITTYHAWK_LCD_DATA,
+	.min_cmd_delay =	80,
+	.reset_cmd1 =		0x80,
+	.reset_cmd2 =		0xc0,
+};
+
+/* direct access to some of the lcd_info variables */
+#define LCD_CMD_REG	lcd_info.lcd_cmd_reg_addr
+#define LCD_DATA_REG	lcd_info.lcd_data_reg_addr
+#define LED_DATA_REG	lcd_info.lcd_cmd_reg_addr	/* LASI & ASP only */
+
+/* ptr to LCD/LED-specific function */
+static void (*led_func_ptr) (unsigned char);
+
+
+static void lcd_print_now(void)
+{
+	int i;
+	char *str = lcd_text;
+
+	if (lcd_info.model != DISPLAY_MODEL_LCD)
+		return;
+
+	if (!lcd_new_text)
+		return;
+	lcd_new_text = 0;
+
+	/* Set LCD Cursor to 1st character */
+	gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG);
+	udelay(lcd_info.min_cmd_delay);
+
+	/* Print the string */
+	for (i = 0; i < lcd_info.lcd_width; i++) {
+		gsc_writeb(*str ? *str++ : ' ', LCD_DATA_REG);
+		udelay(lcd_info.min_cmd_delay);
+	}
+}
+
+/**
+ *	lcd_print()
+ *
+ *	@str: string to show on the LCD. If NULL, print current string again.
+ *
+ *	Displays the given string on the LCD-Display of newer machines.
+ */
+void lcd_print(const char *str)
+{
+	/* copy display string to buffer for procfs */
+	if (str)
+		strscpy(lcd_text, str, sizeof(lcd_text));
+	lcd_new_text = 1;
+
+	/* print now if LCD without any LEDs */
+	if (led_type == LED_HAS_LCD)
+		lcd_print_now();
+}
+
+#define	LED_DATA	0x01	/* data to shift (0:on 1:off) */
+#define	LED_STROBE	0x02	/* strobe to clock data */
+
+/**
+ *	led_ASP_driver() - LED driver for the ASP controller chip
+ *
+ *	@leds: bitmap representing the LED status
+ */
+static void led_ASP_driver(unsigned char leds)
+{
+	int i;
+
+	leds = ~leds;
+	for (i = 0; i < 8; i++) {
+		unsigned char value;
+		value = (leds & 0x80) >> 7;
+		gsc_writeb( value,		 LED_DATA_REG );
+		gsc_writeb( value | LED_STROBE,	 LED_DATA_REG );
+		leds <<= 1;
+	}
+}
+
+/**
+ *	led_LASI_driver() - LED driver for the LASI controller chip
+ *
+ *	@leds: bitmap representing the LED status
+ */
+static void led_LASI_driver(unsigned char leds)
+{
+	leds = ~leds;
+	gsc_writeb( leds, LED_DATA_REG );
+}
+
+/**
+ *	led_LCD_driver() - LED & LCD driver for LCD chips
+ *
+ *	@leds: bitmap representing the LED status
+ */
+static void led_LCD_driver(unsigned char leds)
+{
+	static const unsigned char mask[4] = {
+		LED_HEARTBEAT, LED_DISK_IO,
+		LED_LAN_RCV, LED_LAN_TX };
+
+	static struct lcd_block * const blockp[4] = {
+		&lcd_info.heartbeat,
+		&lcd_info.disk_io,
+		&lcd_info.lan_rcv,
+		&lcd_info.lan_tx
+	};
+	static unsigned char latest_leds;
+	int i;
+
+	for (i = 0; i < 4; ++i) {
+		if ((leds & mask[i]) == (latest_leds & mask[i]))
+			continue;
+
+		gsc_writeb( blockp[i]->command, LCD_CMD_REG );
+		udelay(lcd_info.min_cmd_delay);
+
+		gsc_writeb( leds & mask[i] ? blockp[i]->on :
+				blockp[i]->off, LCD_DATA_REG );
+		udelay(lcd_info.min_cmd_delay);
+	}
+	latest_leds = leds;
+
+	lcd_print_now();
+}
+
+
+/**
+ *	lcd_system_halt()
+ *
+ *	@nb: pointer to the notifier_block structure
+ *	@event: the event (SYS_RESTART, SYS_HALT or SYS_POWER_OFF)
+ *	@buf: pointer to a buffer (not used)
+ *
+ *	Called by the reboot notifier chain at shutdown. Stops all
+ *	LED/LCD activities.
+ */
+static int lcd_system_halt(struct notifier_block *nb, unsigned long event, void *buf)
+{
+	const char *txt;
+
+	switch (event) {
+	case SYS_RESTART:	txt = "SYSTEM RESTART";
+				break;
+	case SYS_HALT:		txt = "SYSTEM HALT";
+				break;
+	case SYS_POWER_OFF:	txt = "SYSTEM POWER OFF";
+				break;
+	default:		return NOTIFY_DONE;
+	}
+
+	lcd_print(txt);
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block lcd_system_halt_notifier = {
+	.notifier_call = lcd_system_halt,
+};
+
+static void set_led(struct led_classdev *led_cdev, enum led_brightness brightness);
+
+struct hppa_led {
+	struct led_classdev	led_cdev;
+	unsigned char		led_bit;
+};
+#define to_hppa_led(d) container_of(d, struct hppa_led, led_cdev)
+
+typedef void (*set_handler)(struct led_classdev *, enum led_brightness);
+struct led_type {
+	const char	*name;
+	set_handler	handler;
+	const char	*default_trigger;
+};
+
+#define NUM_LEDS_PER_BOARD	8
+struct hppa_drvdata {
+	struct hppa_led	leds[NUM_LEDS_PER_BOARD];
+};
+
+static void set_led(struct led_classdev *led_cdev, enum led_brightness brightness)
+{
+	struct hppa_led *p = to_hppa_led(led_cdev);
+	unsigned char led_bit = p->led_bit;
+
+	if (brightness == LED_OFF)
+		lastleds &= ~led_bit;
+	else
+		lastleds |= led_bit;
+
+	if (led_func_ptr)
+		led_func_ptr(lastleds);
+}
+
+
+static int hppa_led_generic_probe(struct platform_device *pdev,
+				  struct led_type *types)
+{
+	struct hppa_drvdata *p;
+	int i, err;
+
+	p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+
+	for (i = 0; i < NUM_LEDS_PER_BOARD; i++) {
+		struct led_classdev *lp = &p->leds[i].led_cdev;
+
+		p->leds[i].led_bit = BIT(i);
+		lp->name = types[i].name;
+		lp->brightness = LED_FULL;
+		lp->brightness_set = types[i].handler;
+		lp->default_trigger = types[i].default_trigger;
+		err = led_classdev_register(&pdev->dev, lp);
+		if (err) {
+			dev_err(&pdev->dev, "Could not register %s LED\n",
+			       lp->name);
+			for (i--; i >= 0; i--)
+				led_classdev_unregister(&p->leds[i].led_cdev);
+			return err;
+		}
+	}
+
+	platform_set_drvdata(pdev, p);
+
+	return 0;
+}
+
+static int platform_led_remove(struct platform_device *pdev)
+{
+	struct hppa_drvdata *p = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < NUM_LEDS_PER_BOARD; i++)
+		led_classdev_unregister(&p->leds[i].led_cdev);
+
+	return 0;
+}
+
+static struct led_type mainboard_led_types[NUM_LEDS_PER_BOARD] = {
+	{
+		.name		= "platform-lan-tx",
+		.handler	= set_led,
+		.default_trigger = "tx",
+	},
+	{
+		.name		= "platform-lan-rx",
+		.handler	= set_led,
+		.default_trigger = "rx",
+	},
+	{
+		.name		= "platform-disk",
+		.handler	= set_led,
+		.default_trigger = "disk-activity",
+	},
+	{
+		.name		= "platform-heartbeat",
+		.handler	= set_led,
+		.default_trigger = "heartbeat",
+	},
+	{
+		.name		= "platform-LED4",
+		.handler	= set_led,
+		.default_trigger = "panic",
+	},
+	{
+		.name		= "platform-LED5",
+		.handler	= set_led,
+		.default_trigger = "panic",
+	},
+	{
+		.name		= "platform-LED6",
+		.handler	= set_led,
+		.default_trigger = "panic",
+	},
+	{
+		.name		= "platform-LED7",
+		.handler	= set_led,
+		.default_trigger = "panic",
+	},
+};
+
+static int platform_led_probe(struct platform_device *pdev)
+{
+	return hppa_led_generic_probe(pdev, mainboard_led_types);
+}
+
+MODULE_ALIAS("platform:platform-leds");
+
+static struct platform_driver hppa_mainboard_led_driver = {
+	.probe		= platform_led_probe,
+	.remove		= platform_led_remove,
+	.driver		= {
+		.name	= "platform-leds",
+	},
+};
+
+static struct platform_driver * const drivers[] = {
+	&hppa_mainboard_led_driver,
+};
+
+static struct platform_device platform_leds = {
+	.name = "platform-leds",
+};
+
+/**
+ *	register_led_driver()
+ *
+ *	@model: model type, one of the DISPLAY_MODEL_XXXX values
+ *	@cmd_reg: physical address of cmd register for the LED/LCD
+ *	@data_reg: physical address of data register for the LED/LCD
+ *
+ *	Registers a chassis LED or LCD which should be driven by this driver.
+ *	Only PDC-based, LASI- or ASP-style LEDs and LCDs are supported.
+ */
+int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg)
+{
+	if (led_func_ptr || !data_reg)
+		return 1;
+
+	/* No LEDs when running in QEMU */
+	if (running_on_qemu)
+		return 1;
+
+	lcd_info.model = model;		/* store the values */
+	LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg;
+
+	switch (lcd_info.model) {
+	case DISPLAY_MODEL_LCD:
+		LCD_DATA_REG = data_reg;
+		pr_info("led: LCD display at %#lx and %#lx\n",
+			LCD_CMD_REG , LCD_DATA_REG);
+		led_func_ptr = led_LCD_driver;
+		if (lcd_no_led_support)
+			led_type = LED_HAS_LCD;
+		else
+			led_type = LED_HAS_LCD | LED_HAS_LED;
+		break;
+
+	case DISPLAY_MODEL_LASI:
+		LED_DATA_REG = data_reg;
+		led_func_ptr = led_LASI_driver;
+		pr_info("led: LED display at %#lx\n", LED_DATA_REG);
+		led_type = LED_HAS_LED;
+		break;
+
+	case DISPLAY_MODEL_OLD_ASP:
+		LED_DATA_REG = data_reg;
+		led_func_ptr = led_ASP_driver;
+		pr_info("led: LED (ASP-style) display at %#lx\n",
+		    LED_DATA_REG);
+		led_type = LED_HAS_LED;
+		break;
+
+	default:
+		pr_err("led: Unknown LCD/LED model type %d\n", lcd_info.model);
+		return 1;
+	}
+
+	platform_register_drivers(drivers, ARRAY_SIZE(drivers));
+
+	return register_reboot_notifier(&lcd_system_halt_notifier);
+}
+
+/**
+ *	early_led_init()
+ *
+ *	early_led_init() is called early in the bootup-process and asks the
+ *	PDC for an usable chassis LCD or LED. If the PDC doesn't return any
+ *	info, then a LED might be detected by the LASI or ASP drivers later.
+ *	KittyHawk machines have often a buggy PDC, so that we explicitly check
+ *	for those machines here.
+ */
+static int __init early_led_init(void)
+{
+	struct pdc_chassis_info chassis_info;
+	int ret;
+
+	snprintf(lcd_text_default, sizeof(lcd_text_default),
+		"Linux %s", init_utsname()->release);
+	strcpy(lcd_text, lcd_text_default);
+	lcd_new_text = 1;
+
+	/* Work around the buggy PDC of KittyHawk-machines */
+	switch (CPU_HVERSION) {
+	case 0x580:		/* KittyHawk DC2-100 (K100) */
+	case 0x581:		/* KittyHawk DC3-120 (K210) */
+	case 0x582:		/* KittyHawk DC3 100 (K400) */
+	case 0x583:		/* KittyHawk DC3 120 (K410) */
+	case 0x58B:		/* KittyHawk DC2 100 (K200) */
+		pr_info("LCD on KittyHawk-Machine found.\n");
+		lcd_info.model = DISPLAY_MODEL_LCD;
+		/* KittyHawk has no LED support on its LCD, so skip LED detection */
+		lcd_no_led_support = 1;
+		goto found;	/* use the preinitialized values of lcd_info */
+	}
+
+	/* initialize the struct, so that we can check for valid return values */
+	chassis_info.actcnt = chassis_info.maxcnt = 0;
+
+	ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info));
+	if (ret != PDC_OK) {
+not_found:
+		lcd_info.model = DISPLAY_MODEL_NONE;
+		return 1;
+	}
+
+	/* check the results. Some machines have a buggy PDC */
+	if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt)
+		goto not_found;
+
+	switch (lcd_info.model) {
+	case DISPLAY_MODEL_LCD:		/* LCD display */
+		if (chassis_info.actcnt <
+			offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1)
+			goto not_found;
+		if (!lcd_info.act_enable) {
+			/* PDC tells LCD should not be used. */
+			goto not_found;
+		}
+		break;
+
+	case DISPLAY_MODEL_NONE:	/* no LED or LCD available */
+		goto not_found;
+
+	case DISPLAY_MODEL_LASI:	/* Lasi style 8 bit LED display */
+		if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32)
+			goto not_found;
+		break;
+
+	default:
+		pr_warn("PDC reported unknown LCD/LED model %d\n",
+		       lcd_info.model);
+		goto not_found;
+	}
+
+found:
+	/* register the LCD/LED driver */
+	return register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG);
+}
+arch_initcall(early_led_init);
+
+/**
+ *	register_led_regions()
+ *
+ *	Register_led_regions() registers the LCD/LED regions for /procfs.
+ *	At bootup - where the initialisation of the LCD/LED often happens
+ *	not all internal structures of request_region() are properly set up,
+ *	so that we delay the led-registration until after busdevices_init()
+ *	has been executed.
+ */
+static void __init register_led_regions(void)
+{
+	switch (lcd_info.model) {
+	case DISPLAY_MODEL_LCD:
+		request_mem_region((unsigned long)LCD_CMD_REG,  1, "lcd_cmd");
+		request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data");
+		break;
+	case DISPLAY_MODEL_LASI:
+	case DISPLAY_MODEL_OLD_ASP:
+		request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data");
+		break;
+	}
+}
+
+static int __init startup_leds(void)
+{
+	if (platform_device_register(&platform_leds))
+                printk(KERN_INFO "LED: failed to register LEDs\n");
+	register_led_regions();
+	return 0;
+}
+device_initcall(startup_leds);