ab8aa4f095
When booting rts7751r2dplus_defconfig on QEMU, the system hangs due to
an interrupt storm on IRQ 20. IRQ 20 aka event 0x280 is a cascaded IRL
interrupt, which maps to IRQ_VOYAGER, the interrupt used by the Silicon
Motion SM501 multimedia companion chip. As rts7751r2d_irq_demux() does
not take into account the new virq offset, the interrupt is no longer
translated, leading to an unhandled interrupt.
Fix this by taking into account the virq offset when translating
cascaded IRL interrupts.
Fixes: a8ac296114 ("sh: Avoid using IRQ0 on SH3 and SH4")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Closes: https://lore.kernel.org/r/fbfea3ad-d327-4ad5-ac9c-648c7ca3fe1f@roeck-us.net
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/2c99d5df41c40691f6c407b7b6a040d406bc81ac.1688901306.git.geert+renesas@glider.be
Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
156 lines
4.5 KiB
C
156 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/sh/boards/renesas/rts7751r2d/irq.c
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*
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* Copyright (C) 2007 Magnus Damm
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* Copyright (C) 2000 Kazumoto Kojima
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*
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* Renesas Technology Sales RTS7751R2D Support, R2D-PLUS and R2D-1.
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*
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* Modified for RTS7751R2D by
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* Atom Create Engineering Co., Ltd. 2002.
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*/
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <mach/r2d.h>
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#define R2D_NR_IRL 13
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enum {
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UNUSED = 0,
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/* board specific interrupt sources (R2D-1 and R2D-PLUS) */
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EXT, /* EXT_INT0-3 */
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RTC_T, RTC_A, /* Real Time Clock */
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AX88796, /* Ethernet controller (R2D-1 board) */
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KEY, /* Key input (R2D-PLUS board) */
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SDCARD, /* SD Card */
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CF_CD, CF_IDE, /* CF Card Detect + CF IDE */
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SM501, /* SM501 aka Voyager */
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PCI_INTD_RTL8139, /* Ethernet controller */
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PCI_INTC_PCI1520, /* Cardbus/PCMCIA bridge */
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PCI_INTB_RTL8139, /* Ethernet controller with HUB (R2D-PLUS board) */
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PCI_INTB_SLOT, /* PCI Slot 3.3v (R2D-1 board) */
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PCI_INTA_SLOT, /* PCI Slot 3.3v */
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TP, /* Touch Panel */
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};
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#ifdef CONFIG_RTS7751R2D_1
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/* Vectors for R2D-1 */
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static struct intc_vect vectors_r2d_1[] __initdata = {
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INTC_IRQ(EXT, IRQ_EXT),
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INTC_IRQ(RTC_T, IRQ_RTC_T), INTC_IRQ(RTC_A, IRQ_RTC_A),
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INTC_IRQ(AX88796, IRQ_AX88796), INTC_IRQ(SDCARD, IRQ_SDCARD),
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INTC_IRQ(CF_CD, IRQ_CF_CD), INTC_IRQ(CF_IDE, IRQ_CF_IDE), /* ng */
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INTC_IRQ(SM501, IRQ_VOYAGER),
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INTC_IRQ(PCI_INTD_RTL8139, IRQ_PCI_INTD),
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INTC_IRQ(PCI_INTC_PCI1520, IRQ_PCI_INTC),
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INTC_IRQ(PCI_INTB_SLOT, IRQ_PCI_INTB),
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INTC_IRQ(PCI_INTA_SLOT, IRQ_PCI_INTA),
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INTC_IRQ(TP, IRQ_TP),
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};
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/* IRLMSK mask register layout for R2D-1 */
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static struct intc_mask_reg mask_registers_r2d_1[] __initdata = {
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{ 0xa4000000, 0, 16, /* IRLMSK */
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{ TP, PCI_INTA_SLOT, PCI_INTB_SLOT,
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PCI_INTC_PCI1520, PCI_INTD_RTL8139,
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SM501, CF_IDE, CF_CD, SDCARD, AX88796,
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RTC_A, RTC_T, 0, 0, 0, EXT } },
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};
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/* IRLn to IRQ table for R2D-1 */
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static unsigned char irl2irq_r2d_1[R2D_NR_IRL] __initdata = {
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IRQ_PCI_INTD, IRQ_CF_IDE, IRQ_CF_CD, IRQ_PCI_INTC,
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IRQ_VOYAGER, IRQ_AX88796, IRQ_RTC_A, IRQ_RTC_T,
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IRQ_SDCARD, IRQ_PCI_INTA, IRQ_PCI_INTB, IRQ_EXT,
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IRQ_TP,
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};
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static DECLARE_INTC_DESC(intc_desc_r2d_1, "r2d-1", vectors_r2d_1,
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NULL, mask_registers_r2d_1, NULL, NULL);
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#endif /* CONFIG_RTS7751R2D_1 */
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#ifdef CONFIG_RTS7751R2D_PLUS
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/* Vectors for R2D-PLUS */
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static struct intc_vect vectors_r2d_plus[] __initdata = {
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INTC_IRQ(EXT, IRQ_EXT),
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INTC_IRQ(RTC_T, IRQ_RTC_T), INTC_IRQ(RTC_A, IRQ_RTC_A),
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INTC_IRQ(KEY, IRQ_KEY), INTC_IRQ(SDCARD, IRQ_SDCARD),
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INTC_IRQ(CF_CD, IRQ_CF_CD), INTC_IRQ(CF_IDE, IRQ_CF_IDE),
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INTC_IRQ(SM501, IRQ_VOYAGER),
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INTC_IRQ(PCI_INTD_RTL8139, IRQ_PCI_INTD),
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INTC_IRQ(PCI_INTC_PCI1520, IRQ_PCI_INTC),
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INTC_IRQ(PCI_INTB_RTL8139, IRQ_PCI_INTB),
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INTC_IRQ(PCI_INTA_SLOT, IRQ_PCI_INTA),
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INTC_IRQ(TP, IRQ_TP),
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};
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/* IRLMSK mask register layout for R2D-PLUS */
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static struct intc_mask_reg mask_registers_r2d_plus[] __initdata = {
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{ 0xa4000000, 0, 16, /* IRLMSK */
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{ TP, PCI_INTA_SLOT, PCI_INTB_RTL8139,
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PCI_INTC_PCI1520, PCI_INTD_RTL8139,
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SM501, CF_IDE, CF_CD, SDCARD, KEY,
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RTC_A, RTC_T, 0, 0, 0, EXT } },
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};
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/* IRLn to IRQ table for R2D-PLUS */
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static unsigned char irl2irq_r2d_plus[R2D_NR_IRL] __initdata = {
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IRQ_PCI_INTD, IRQ_CF_IDE, IRQ_CF_CD, IRQ_PCI_INTC,
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IRQ_VOYAGER, IRQ_KEY, IRQ_RTC_A, IRQ_RTC_T,
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IRQ_SDCARD, IRQ_PCI_INTA, IRQ_PCI_INTB, IRQ_EXT,
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IRQ_TP,
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};
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static DECLARE_INTC_DESC(intc_desc_r2d_plus, "r2d-plus", vectors_r2d_plus,
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NULL, mask_registers_r2d_plus, NULL, NULL);
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#endif /* CONFIG_RTS7751R2D_PLUS */
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static unsigned char irl2irq[R2D_NR_IRL];
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int rts7751r2d_irq_demux(int irq)
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{
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if (irq >= R2D_NR_IRL + 16 || irq < 16 || !irl2irq[irq - 16])
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return irq;
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return irl2irq[irq - 16];
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}
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/*
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* Initialize IRQ setting
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*/
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void __init init_rts7751r2d_IRQ(void)
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{
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struct intc_desc *d;
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switch (__raw_readw(PA_VERREG) & 0xf0) {
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#ifdef CONFIG_RTS7751R2D_PLUS
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case 0x10:
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printk(KERN_INFO "Using R2D-PLUS interrupt controller.\n");
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d = &intc_desc_r2d_plus;
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memcpy(irl2irq, irl2irq_r2d_plus, R2D_NR_IRL);
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break;
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#endif
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#ifdef CONFIG_RTS7751R2D_1
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case 0x00: /* according to manual */
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case 0x30: /* in reality */
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printk(KERN_INFO "Using R2D-1 interrupt controller.\n");
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d = &intc_desc_r2d_1;
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memcpy(irl2irq, irl2irq_r2d_1, R2D_NR_IRL);
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break;
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#endif
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default:
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printk(KERN_INFO "Unknown R2D interrupt controller 0x%04x\n",
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__raw_readw(PA_VERREG));
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return;
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}
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register_intc_controller(d);
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}
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