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, 220 insertions, 0 deletions

diff --git a/arch/m68k/atari/stdma.c b/arch/m68k/atari/stdma.c
new file mode 100644
index 000000000..155fefff1
--- /dev/null
+++ b/arch/m68k/atari/stdma.c
@@ -0,0 +1,220 @@
+/*
+ *  linux/arch/m68k/atari/stmda.c
+ *
+ *  Copyright (C) 1994 Roman Hodek
+ *
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+
+/* This file contains some function for controlling the access to the  */
+/* ST-DMA chip that may be shared between devices. Currently we have:  */
+/*   TT:     Floppy and ACSI bus                                       */
+/*   Falcon: Floppy and SCSI                                           */
+/*                                                                     */
+/* The controlling functions set up a wait queue for access to the     */
+/* ST-DMA chip. Callers to stdma_lock() that cannot granted access are */
+/* put onto a queue and waked up later if the owner calls              */
+/* stdma_release(). Additionally, the caller gives his interrupt       */
+/* service routine to stdma_lock().                                    */
+/*                                                                     */
+/* On the Falcon, the IDE bus uses just the ACSI/Floppy interrupt, but */
+/* not the ST-DMA chip itself. So falhd.c needs not to lock the        */
+/* chip. The interrupt is routed to falhd.c if IDE is configured, the  */
+/* model is a Falcon and the interrupt was caused by the HD controller */
+/* (can be determined by looking at its status register).              */
+
+
+#include <linux/types.h>
+#include <linux/kdev_t.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/wait.h>
+#include <linux/module.h>
+
+#include <asm/atari_stdma.h>
+#include <asm/atariints.h>
+#include <asm/atarihw.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+
+static int stdma_locked;			/* the semaphore */
+						/* int func to be called */
+static irq_handler_t stdma_isr;
+static void *stdma_isr_data;			/* data passed to isr */
+static DECLARE_WAIT_QUEUE_HEAD(stdma_wait);	/* wait queue for ST-DMA */
+
+
+
+
+/***************************** Prototypes *****************************/
+
+static irqreturn_t stdma_int (int irq, void *dummy);
+
+/************************* End of Prototypes **************************/
+
+
+/**
+ * stdma_try_lock - attempt to acquire ST DMA interrupt "lock"
+ * @handler: interrupt handler to use after acquisition
+ * @data: cookie passed to the interrupt handler function
+ *
+ * Returns !0 if lock was acquired; otherwise 0.
+ */
+
+int stdma_try_lock(irq_handler_t handler, void *data)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	if (stdma_locked) {
+		local_irq_restore(flags);
+		return 0;
+	}
+
+	stdma_locked   = 1;
+	stdma_isr      = handler;
+	stdma_isr_data = data;
+	local_irq_restore(flags);
+	return 1;
+}
+EXPORT_SYMBOL(stdma_try_lock);
+
+
+/*
+ * Function: void stdma_lock( isrfunc isr, void *data )
+ *
+ * Purpose: Tries to get a lock on the ST-DMA chip that is used by more
+ *   then one device driver. Waits on stdma_wait until lock is free.
+ *   stdma_lock() may not be called from an interrupt! You have to
+ *   get the lock in your main routine and release it when your
+ *   request is finished.
+ *
+ * Inputs: A interrupt function that is called until the lock is
+ *   released.
+ *
+ * Returns: nothing
+ *
+ */
+
+void stdma_lock(irq_handler_t handler, void *data)
+{
+	/* Since the DMA is used for file system purposes, we
+	 have to sleep uninterruptible (there may be locked
+	 buffers) */
+	wait_event(stdma_wait, stdma_try_lock(handler, data));
+}
+EXPORT_SYMBOL(stdma_lock);
+
+
+/*
+ * Function: void stdma_release( void )
+ *
+ * Purpose: Releases the lock on the ST-DMA chip.
+ *
+ * Inputs: none
+ *
+ * Returns: nothing
+ *
+ */
+
+void stdma_release(void)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	stdma_locked   = 0;
+	stdma_isr      = NULL;
+	stdma_isr_data = NULL;
+	wake_up(&stdma_wait);
+
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(stdma_release);
+
+
+/**
+ * stdma_is_locked_by - allow lock holder to check whether it needs to release.
+ * @handler: interrupt handler previously used to acquire lock.
+ *
+ * Returns !0 if locked for the given handler; 0 otherwise.
+ */
+
+int stdma_is_locked_by(irq_handler_t handler)
+{
+	unsigned long flags;
+	int result;
+
+	local_irq_save(flags);
+	result = stdma_locked && (stdma_isr == handler);
+	local_irq_restore(flags);
+
+	return result;
+}
+EXPORT_SYMBOL(stdma_is_locked_by);
+
+
+/*
+ * Function: int stdma_islocked( void )
+ *
+ * Purpose: Check if the ST-DMA is currently locked.
+ * Note: Returned status is only valid if ints are disabled while calling and
+ *       as long as they remain disabled.
+ *       If called with ints enabled, status can change only from locked to
+ *       unlocked, because ints may not lock the ST-DMA.
+ *
+ * Inputs: none
+ *
+ * Returns: != 0 if locked, 0 otherwise
+ *
+ */
+
+int stdma_islocked(void)
+{
+	return stdma_locked;
+}
+EXPORT_SYMBOL(stdma_islocked);
+
+
+/*
+ * Function: void stdma_init( void )
+ *
+ * Purpose: Initialize the ST-DMA chip access controlling.
+ *   It sets up the interrupt and its service routine. The int is registered
+ *   as slow int, client devices have to live with that (no problem
+ *   currently).
+ *
+ * Inputs: none
+ *
+ * Return: nothing
+ *
+ */
+
+void __init stdma_init(void)
+{
+	stdma_isr = NULL;
+	if (request_irq(IRQ_MFP_FDC, stdma_int, IRQF_SHARED,
+			"ST-DMA floppy,ACSI,IDE,Falcon-SCSI", stdma_int))
+		pr_err("Couldn't register ST-DMA interrupt\n");
+}
+
+
+/*
+ * Function: void stdma_int()
+ *
+ * Purpose: The interrupt routine for the ST-DMA. It calls the isr
+ *   registered by stdma_lock().
+ *
+ */
+
+static irqreturn_t stdma_int(int irq, void *dummy)
+{
+  if (stdma_isr)
+      (*stdma_isr)(irq, stdma_isr_data);
+  return IRQ_HANDLED;
+}