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authorLinus Torvalds <torvalds@linux-foundation.org>2026-08-19 10:09:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2026-08-19 10:09:22 -0700
commitf4cdf7ca9a1fdcca413157df19753f388a5a224e (patch)
tree60a31895b2446cd7fa27514e8c2843534a0de0da /arch/mips/dec/int-handler.S
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Merge tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-mediagrafted
Pull media updates from Mauro Carvalho Chehab: - v4l2-core: added ISP statistics support and per-block validation - v4l2-core: Allow unknown HDR10 white point and luminance - New camera sensors: Sony IMX678 and IMX471m, Himax HM1092 IR sensor - New codec: Milos: VPU v2.0 codec support - isp driver: gained support for Dreamchip RPPX1 ISP framework - vsp1 driver: gained support for RZ/T2H and RZ/N2H - Novalake driver: gained CVS support for new NVL hardware - dvb-core: fix feed leak on failed DMX_ADD_PID - several driver fixes, cleanups and minor improvements * tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (308 commits) media: ipu-bridge: check all DMI entries when overriding sensor rotation media: v4l2-async: avoid deleting unlinked ASC entry on link error media: rzg2l-cru: Align bytesperline to hardware DMA stride requirement media: intel/ipu6: fix async notifier cleanup leak on parse error media: staging/ipu7: fix async notifier UAF on probe error path media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem() media: rcar-isp: Fix VSPX reference leaks media: rcar-isp: Release ISPCORE resources media: i2c: imx415: Release runtime PM reference on VBLANK error media: i2c: imx415: Return test pattern write errors media: renesas: vsp1: Declare index variables in for loop statement media: renesas: vsp1: Make reset control optional to support platforms without a reset line media: dt-bindings: media: renesas,vsp1: Document RZ/T2H and RZ/N2H SoCs media: dt-bindings: media: renesas,fcp: Document RZ/T2H and RZ/N2H SoCs media: nxp: imx8-isi: Add additional 32-bit RGB format support media: nxp: imx8-isi: Add 16-bit raw Bayer format support media: nxp: imx8-isi: Implement per-stream reference counting for multiplexed streams media: nxp: imx8-isi: Use BIT_ULL() for 64-bit stream masks media: nxp: imx8-isi: Correct color map between V4L2 and ISI ...
Diffstat (limited to 'arch/mips/dec/int-handler.S')
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diff --git a/arch/mips/dec/int-handler.S b/arch/mips/dec/int-handler.S
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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 1995, 1996, 1997 Paul M. Antoine and Harald Koerfgen
+ * Copyright (C) 2000, 2001, 2002, 2003, 2005 Maciej W. Rozycki
+ *
+ * Written by Ralf Baechle and Andreas Busse, modified for DECstation
+ * support by Paul Antoine and Harald Koerfgen.
+ *
+ * completely rewritten:
+ * Copyright (C) 1998 Harald Koerfgen
+ *
+ * Rewritten extensively for controller-driven IRQ support
+ * by Maciej W. Rozycki.
+ */
+
+#include <asm/addrspace.h>
+#include <asm/asm.h>
+#include <asm/mipsregs.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+
+#include <asm/dec/interrupts.h>
+#include <asm/dec/ioasic_addrs.h>
+#include <asm/dec/ioasic_ints.h>
+#include <asm/dec/kn01.h>
+#include <asm/dec/kn02.h>
+#include <asm/dec/kn02xa.h>
+#include <asm/dec/kn03.h>
+
+#define KN02_CSR_BASE CKSEG1ADDR(KN02_SLOT_BASE + KN02_CSR)
+#define KN02XA_IOASIC_BASE CKSEG1ADDR(KN02XA_SLOT_BASE + IOASIC_IOCTL)
+#define KN03_IOASIC_BASE CKSEG1ADDR(KN03_SLOT_BASE + IOASIC_IOCTL)
+
+ .text
+ .set noreorder
+/*
+ * plat_irq_dispatch: Interrupt handler for DECstations
+ *
+ * We follow the model in the Indy interrupt code by David Miller, where he
+ * says: a lot of complication here is taken away because:
+ *
+ * 1) We handle one interrupt and return, sitting in a loop
+ * and moving across all the pending IRQ bits in the cause
+ * register is _NOT_ the answer, the common case is one
+ * pending IRQ so optimize in that direction.
+ *
+ * 2) We need not check against bits in the status register
+ * IRQ mask, that would make this routine slow as hell.
+ *
+ * 3) Linux only thinks in terms of all IRQs on or all IRQs
+ * off, nothing in between like BSD spl() brain-damage.
+ *
+ * Furthermore, the IRQs on the DECstations look basically (barring
+ * software IRQs which we don't use at all) like...
+ *
+ * DS2100/3100's, aka kn01, aka Pmax:
+ *
+ * MIPS IRQ Source
+ * -------- ------
+ * 0 Software (ignored)
+ * 1 Software (ignored)
+ * 2 SCSI
+ * 3 Lance Ethernet
+ * 4 DZ11 serial
+ * 5 RTC
+ * 6 Memory Controller & Video
+ * 7 FPU
+ *
+ * DS5000/200, aka kn02, aka 3max:
+ *
+ * MIPS IRQ Source
+ * -------- ------
+ * 0 Software (ignored)
+ * 1 Software (ignored)
+ * 2 TurboChannel
+ * 3 RTC
+ * 4 Reserved
+ * 5 Memory Controller
+ * 6 Reserved
+ * 7 FPU
+ *
+ * DS5000/1xx's, aka kn02ba, aka 3min:
+ *
+ * MIPS IRQ Source
+ * -------- ------
+ * 0 Software (ignored)
+ * 1 Software (ignored)
+ * 2 TurboChannel Slot 0
+ * 3 TurboChannel Slot 1
+ * 4 TurboChannel Slot 2
+ * 5 TurboChannel Slot 3 (ASIC)
+ * 6 Halt button
+ * 7 FPU/R4k timer
+ *
+ * DS5000/2x's, aka kn02ca, aka maxine:
+ *
+ * MIPS IRQ Source
+ * -------- ------
+ * 0 Software (ignored)
+ * 1 Software (ignored)
+ * 2 Periodic Interrupt (100usec)
+ * 3 RTC
+ * 4 I/O write timeout
+ * 5 TurboChannel (ASIC)
+ * 6 Halt Keycode from Access.Bus keyboard (CTRL-ALT-ENTER)
+ * 7 FPU/R4k timer
+ *
+ * DS5000/2xx's, aka kn03, aka 3maxplus:
+ *
+ * MIPS IRQ Source
+ * -------- ------
+ * 0 Software (ignored)
+ * 1 Software (ignored)
+ * 2 System Board (ASIC)
+ * 3 RTC
+ * 4 Reserved
+ * 5 Memory
+ * 6 Halt Button
+ * 7 FPU/R4k timer
+ *
+ * We handle the IRQ according to _our_ priority (see setup.c),
+ * then we just return. If multiple IRQs are pending then we will
+ * just take another exception, big deal.
+ */
+ .align 5
+ NESTED(plat_irq_dispatch, PT_SIZE, ra)
+ .set noreorder
+
+ /*
+ * Get pending Interrupts
+ */
+ mfc0 t0,CP0_CAUSE # get pending interrupts
+ mfc0 t1,CP0_STATUS
+#if defined(CONFIG_32BIT) && defined(CONFIG_MIPS_FP_SUPPORT)
+ lw t2,cpu_fpu_mask
+#endif
+ andi t0,ST0_IM # CAUSE.CE may be non-zero!
+ and t0,t1 # isolate allowed ones
+
+ beqz t0,spurious
+
+#if defined(CONFIG_32BIT) && defined(CONFIG_MIPS_FP_SUPPORT)
+ and t2,t0
+ bnez t2,fpu # handle FPU immediately
+#endif
+
+ /*
+ * Find irq with highest priority
+ */
+ # open coded PTR_LA t1, cpu_mask_nr_tbl
+#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
+ # open coded la t1, cpu_mask_nr_tbl
+ lui t1, %hi(cpu_mask_nr_tbl)
+ addiu t1, %lo(cpu_mask_nr_tbl)
+#else
+#error GCC `-msym32' option required for 64-bit DECstation builds
+#endif
+1: lw t2,(t1)
+ nop
+ and t2,t0
+ beqz t2,1b
+ addu t1,2*PTRSIZE # delay slot
+
+ /*
+ * Do the low-level stuff
+ */
+ lw a0,(-PTRSIZE)(t1)
+ nop
+ bgez a0,handle_it # irq_nr >= 0?
+ # irq_nr < 0: it is an address
+ nop
+ jr a0
+ # a trick to save a branch:
+ lui t2,(KN03_IOASIC_BASE>>16)&0xffff
+ # upper part of IOASIC Address
+
+/*
+ * Handle "IRQ Controller" Interrupts
+ * Masked Interrupts are still visible and have to be masked "by hand".
+ */
+ FEXPORT(kn02_io_int) # 3max
+ lui t0,(KN02_CSR_BASE>>16)&0xffff
+ # get interrupt status and mask
+ lw t0,(t0)
+ nop
+ andi t1,t0,KN02_IRQ_ALL
+ b 1f
+ srl t0,16 # shift interrupt mask
+
+ FEXPORT(kn02xa_io_int) # 3min/maxine
+ lui t2,(KN02XA_IOASIC_BASE>>16)&0xffff
+ # upper part of IOASIC Address
+
+ FEXPORT(kn03_io_int) # 3max+ (t2 loaded earlier)
+ lw t0,IO_REG_SIR(t2) # get status: IOASIC sir
+ lw t1,IO_REG_SIMR(t2) # get mask: IOASIC simr
+ nop
+
+1: and t0,t1 # mask out allowed ones
+
+ beqz t0,spurious
+
+ /*
+ * Find irq with highest priority
+ */
+ # open coded PTR_LA t1,asic_mask_nr_tbl
+#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
+ # open coded la t1, asic_mask_nr_tbl
+ lui t1, %hi(asic_mask_nr_tbl)
+ addiu t1, %lo(asic_mask_nr_tbl)
+#else
+#error GCC `-msym32' option required for 64-bit DECstation builds
+#endif
+2: lw t2,(t1)
+ nop
+ and t2,t0
+ beq zero,t2,2b
+ addu t1,2*PTRSIZE # delay slot
+
+ /*
+ * Do the low-level stuff
+ */
+ lw a0,%lo(-PTRSIZE)(t1)
+ nop
+ bgez a0,handle_it # irq_nr >= 0?
+ # irq_nr < 0: it is an address
+ nop
+ jr a0
+ nop # delay slot
+
+/*
+ * Dispatch low-priority interrupts. We reconsider all status
+ * bits again, which looks like a lose, but it makes the code
+ * simple and O(log n), so it gets compensated.
+ */
+ FEXPORT(cpu_all_int) # HALT, timers, software junk
+ li a0,DEC_CPU_IRQ_BASE
+ srl t0,CAUSEB_IP
+ li t1,CAUSEF_IP>>CAUSEB_IP # mask
+ b 1f
+ li t2,4 # nr of bits / 2
+
+ FEXPORT(kn02_all_int) # impossible ?
+ li a0,KN02_IRQ_BASE
+ li t1,KN02_IRQ_ALL # mask
+ b 1f
+ li t2,4 # nr of bits / 2
+
+ FEXPORT(asic_all_int) # various I/O ASIC junk
+ li a0,IO_IRQ_BASE
+ li t1,IO_IRQ_ALL # mask
+ b 1f
+ li t2,8 # nr of bits / 2
+
+/*
+ * Dispatch DMA interrupts -- O(log n).
+ */
+ FEXPORT(asic_dma_int) # I/O ASIC DMA events
+ li a0,IO_IRQ_BASE+IO_INR_DMA
+ srl t0,IO_INR_DMA
+ li t1,IO_IRQ_DMA>>IO_INR_DMA # mask
+ li t2,8 # nr of bits / 2
+
+ /*
+ * Find irq with highest priority.
+ * Highest irq number takes precedence.
+ */
+1: srlv t3,t1,t2
+2: xor t1,t3
+ and t3,t0,t1
+ beqz t3,3f
+ nop
+ move t0,t3
+ addu a0,t2
+3: srl t2,1
+ bnez t2,2b
+ srlv t3,t1,t2
+
+handle_it:
+ j do_IRQ
+ nop
+
+#if defined(CONFIG_32BIT) && defined(CONFIG_MIPS_FP_SUPPORT)
+fpu:
+ lw t0,fpu_kstat_irq
+ nop
+ lw t1,(t0)
+ nop
+ addu t1,1
+ j handle_fpe_int
+ sw t1,(t0)
+#endif
+
+spurious:
+ j spurious_interrupt
+ nop
+ END(plat_irq_dispatch)
+
+/*
+ * Generic unimplemented interrupt routines -- cpu_mask_nr_tbl
+ * and asic_mask_nr_tbl are initialized to point all interrupts here.
+ * The tables are then filled in by machine-specific initialisation
+ * in dec_setup().
+ */
+ FEXPORT(dec_intr_unimplemented)
+ move a1,t0 # cheats way of printing an arg!
+ ASM_PANIC("Unimplemented cpu interrupt! CP0_CAUSE: 0x%08x");
+
+ FEXPORT(asic_intr_unimplemented)
+ move a1,t0 # cheats way of printing an arg!
+ ASM_PANIC("Unimplemented asic interrupt! ASIC ISR: 0x%08x");