Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 266 insertions, 0 deletions

diff --git a/drivers/parisc/power.c b/drivers/parisc/power.c
new file mode 100644
index 000000000..9d6c7bf72
--- /dev/null
+++ b/drivers/parisc/power.c
@@ -0,0 +1,266 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * HP PARISC soft power switch driver
+ *
+ * Copyright (c) 2001-2023 Helge Deller <deller@gmx.de>
+ *
+ *  HINT:
+ *  Support of the soft power switch button may be enabled or disabled at
+ *  runtime through the "/proc/sys/kernel/power" procfs entry.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/panic_notifier.h>
+#include <linux/reboot.h>
+#include <linux/sched/signal.h>
+#include <linux/kthread.h>
+#include <linux/pm.h>
+
+#include <asm/pdc.h>
+#include <asm/io.h>
+#include <asm/led.h>
+
+#define DRIVER_NAME  "powersw"
+#define KTHREAD_NAME "kpowerswd"
+
+/* how often should the power button be polled ? */
+#define POWERSWITCH_POLL_PER_SEC 2
+
+/* how long does the power button needs to be down until we react ? */
+#define POWERSWITCH_DOWN_SEC 2
+
+/* assembly code to access special registers */
+/* taken from PCXL ERS page 82 */
+#define DIAG_CODE(code)		(0x14000000 + ((code)<<5))
+
+#define MFCPU_X(rDiagReg, t_ch, t_th, code) \
+	(DIAG_CODE(code) + ((rDiagReg)<<21) + ((t_ch)<<16) + ((t_th)<<0) )
+
+#define MTCPU(dr, gr)		MFCPU_X(dr, gr,  0, 0x12)       /* move value of gr to dr[dr] */
+#define MFCPU_C(dr, gr)		MFCPU_X(dr, gr,  0, 0x30)	/* for dr0 and dr8 only ! */
+#define MFCPU_T(dr, gr)		MFCPU_X(dr,  0, gr, 0xa0)	/* all dr except dr0 and dr8 */
+
+#define __getDIAG(dr) ( {			\
+        register unsigned long __res asm("r28");\
+	 __asm__ __volatile__ (			\
+		".word %1" : "=&r" (__res) : "i" (MFCPU_T(dr,28) ) \
+	);					\
+	__res;					\
+} )
+
+/* local shutdown counter */
+static int shutdown_timer __read_mostly;
+
+/* check, give feedback and start shutdown after one second */
+static void process_shutdown(void)
+{
+	if (shutdown_timer == 0)
+		printk(KERN_ALERT KTHREAD_NAME ": Shutdown requested...\n");
+
+	shutdown_timer++;
+
+	/* wait until the button was pressed for 1 second */
+	if (shutdown_timer == (POWERSWITCH_DOWN_SEC*POWERSWITCH_POLL_PER_SEC)) {
+		static const char msg[] = "Shutting down...";
+		printk(KERN_INFO KTHREAD_NAME ": %s\n", msg);
+		lcd_print(msg);
+
+		/* send kill signal */
+		if (kill_cad_pid(SIGINT, 1)) {
+			/* just in case killing init process failed */
+			machine_power_off();
+		}
+	}
+}
+
+
+/* main power switch task struct */
+static struct task_struct *power_task;
+
+/* filename in /proc which can be used to enable/disable the power switch */
+#define SYSCTL_FILENAME	"sys/kernel/power"
+
+/* soft power switch enabled/disabled */
+static int pwrsw_enabled __read_mostly = 1;
+
+static const struct ctl_table power_sysctl_table[] = {
+	{
+		.procname	= "soft-power",
+		.data		= &pwrsw_enabled,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+};
+
+static int __init init_power_sysctl(void)
+{
+	register_sysctl_init("kernel", power_sysctl_table);
+	return 0;
+}
+
+arch_initcall(init_power_sysctl);
+
+/* main kernel thread worker. It polls the button state */
+static int kpowerswd(void *param)
+{
+	__set_current_state(TASK_RUNNING);
+
+	do {
+		int button_not_pressed;
+		unsigned long soft_power_reg = (unsigned long) param;
+
+		schedule_timeout_interruptible(pwrsw_enabled ? HZ : HZ/POWERSWITCH_POLL_PER_SEC);
+
+		if (unlikely(!pwrsw_enabled))
+			continue;
+
+		if (soft_power_reg) {
+			/*
+			 * Non-Gecko-style machines:
+			 * Check the power switch status which is read from the
+			 * real I/O location at soft_power_reg.
+			 * Bit 31 ("the lowest bit) is the status of the power switch.
+			 * This bit is "1" if the button is NOT pressed.
+			 */
+			button_not_pressed = (gsc_readl(soft_power_reg) & 0x1);
+		} else {
+			/*
+			 * On gecko style machines (e.g. 712/xx and 715/xx)
+			 * the power switch status is stored in Bit 0 ("the highest bit")
+			 * of CPU diagnose register 25.
+			 * Warning: Some machines never reset the DIAG flag, even if
+			 * the button has been released again.
+			 */
+			button_not_pressed = (__getDIAG(25) & 0x80000000);
+		}
+
+		if (likely(button_not_pressed)) {
+			if (unlikely(shutdown_timer && /* avoid writing if not necessary */
+				shutdown_timer < (POWERSWITCH_DOWN_SEC*POWERSWITCH_POLL_PER_SEC))) {
+				shutdown_timer = 0;
+				printk(KERN_INFO KTHREAD_NAME ": Shutdown request aborted.\n");
+			}
+		} else
+			process_shutdown();
+
+
+	} while (!kthread_should_stop());
+
+	return 0;
+}
+
+
+/*
+ * powerfail interruption handler (irq IRQ_FROM_REGION(CPU_IRQ_REGION)+2)
+ */
+#if 0
+static void powerfail_interrupt(int code, void *x)
+{
+	printk(KERN_CRIT "POWERFAIL INTERRUPTION !\n");
+	poweroff();
+}
+#endif
+
+
+
+
+/*
+ * parisc_panic_event() is called by the panic handler.
+ *
+ * As soon as a panic occurs, our tasklets above will not
+ * be executed any longer. This function then re-enables
+ * the soft-power switch and allows the user to switch off
+ * the system. We rely in pdc_soft_power_button_panic()
+ * since this version spin_trylocks (instead of regular
+ * spinlock), preventing deadlocks on panic path.
+ */
+static int parisc_panic_event(struct notifier_block *this,
+		unsigned long event, void *ptr)
+{
+	/* re-enable the soft-power switch */
+	pdc_soft_power_button_panic(0);
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block parisc_panic_block = {
+	.notifier_call	= parisc_panic_event,
+	.priority	= INT_MAX,
+};
+
+/* qemu soft power-off function */
+static int qemu_power_off(struct sys_off_data *data)
+{
+	/* this turns the system off via SeaBIOS */
+	gsc_writel(0, (unsigned long) data->cb_data);
+	pdc_soft_power_button(1);
+	return NOTIFY_DONE;
+}
+
+static int __init power_init(void)
+{
+	unsigned long ret;
+	unsigned long soft_power_reg;
+
+#if 0
+	request_irq( IRQ_FROM_REGION(CPU_IRQ_REGION)+2, &powerfail_interrupt,
+		0, "powerfail", NULL);
+#endif
+
+	/* enable the soft power switch if possible */
+	ret = pdc_soft_power_info(&soft_power_reg);
+	if (ret == PDC_OK)
+		ret = pdc_soft_power_button(1);
+	if (ret != PDC_OK)
+		soft_power_reg = -1UL;
+
+	switch (soft_power_reg) {
+	case 0:		printk(KERN_INFO DRIVER_NAME ": Gecko-style soft power switch enabled.\n");
+			break;
+
+	case -1UL:	printk(KERN_INFO DRIVER_NAME ": Soft power switch support not available.\n");
+			return -ENODEV;
+
+	default:	printk(KERN_INFO DRIVER_NAME ": Soft power switch at 0x%08lx enabled.\n",
+				soft_power_reg);
+	}
+
+	power_task = NULL;
+	if (running_on_qemu && soft_power_reg)
+		register_sys_off_handler(SYS_OFF_MODE_POWER_OFF, SYS_OFF_PRIO_DEFAULT,
+					qemu_power_off, (void *)soft_power_reg);
+	if (!running_on_qemu || soft_power_reg)
+		power_task = kthread_run(kpowerswd, (void*)soft_power_reg,
+					KTHREAD_NAME);
+	if (IS_ERR(power_task)) {
+		printk(KERN_ERR DRIVER_NAME ": thread creation failed.  Driver not loaded.\n");
+		pdc_soft_power_button(0);
+		return -EIO;
+	}
+
+	/* Register a call for panic conditions. */
+	atomic_notifier_chain_register(&panic_notifier_list,
+			&parisc_panic_block);
+
+	return 0;
+}
+
+static void __exit power_exit(void)
+{
+	kthread_stop(power_task);
+
+	atomic_notifier_chain_unregister(&panic_notifier_list,
+			&parisc_panic_block);
+
+	pdc_soft_power_button(0);
+}
+
+arch_initcall(power_init);
+module_exit(power_exit);
+
+
+MODULE_AUTHOR("Helge Deller <deller@gmx.de>");
+MODULE_DESCRIPTION("Soft power switch driver");
+MODULE_LICENSE("Dual BSD/GPL");