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-rw-r--r--arch/arm/mach-rpc/Kconfig21
-rw-r--r--arch/arm/mach-rpc/Makefile.boot5
-rw-r--r--arch/arm/mach-rpc/fiq.S5
-rw-r--r--arch/arm/mach-rpc/include/mach/entry-macro.S13
-rw-r--r--arch/arm/mach-rpc/irq.c95
5 files changed, 119 insertions, 20 deletions
diff --git a/arch/arm/mach-rpc/Kconfig b/arch/arm/mach-rpc/Kconfig
new file mode 100644
index 000000000000..55f6d829b677
--- /dev/null
+++ b/arch/arm/mach-rpc/Kconfig
@@ -0,0 +1,21 @@
+config ARCH_RPC
+ bool "RiscPC"
+ depends on ARCH_MULTI_V4 && !(ARCH_MULTI_V4T || ARCH_MULTI_V5)
+ depends on !(ARCH_FOOTBRIDGE || ARCH_SA1100 || ARCH_MOXART || ARCH_GEMINI)
+ depends on !CC_IS_CLANG && GCC_VERSION < 90100 && GCC_VERSION >= 60000
+ depends on CPU_LITTLE_ENDIAN
+ depends on ATAGS
+ depends on MMU
+ select ARCH_ACORN
+ select ARCH_MAY_HAVE_PC_FDC
+ select CPU_SA110
+ select FIQ
+ select HAVE_PATA_PLATFORM
+ select ISA_DMA_API
+ select LEGACY_TIMER_TICK
+ select NEED_MACH_IO_H
+ select NEED_MACH_MEMORY_H
+ select NO_IOPORT_MAP
+ help
+ On the Acorn Risc-PC, Linux can support the internal IDE disk and
+ CD-ROM interface, serial and parallel port, and the floppy drive.
diff --git a/arch/arm/mach-rpc/Makefile.boot b/arch/arm/mach-rpc/Makefile.boot
deleted file mode 100644
index 0ed8e8fbde99..000000000000
--- a/arch/arm/mach-rpc/Makefile.boot
+++ /dev/null
@@ -1,5 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
- zreladdr-y += 0x10008000
-params_phys-y := 0x10000100
-initrd_phys-y := 0x18000000
-
diff --git a/arch/arm/mach-rpc/fiq.S b/arch/arm/mach-rpc/fiq.S
index 0de83e9b0b39..087bdf4bc093 100644
--- a/arch/arm/mach-rpc/fiq.S
+++ b/arch/arm/mach-rpc/fiq.S
@@ -2,10 +2,11 @@
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <mach/hardware.h>
-#include <mach/entry-macro.S>
- .text
+ .equ ioc_base_high, IOC_BASE & 0xff000000
+ .equ ioc_base_low, IOC_BASE & 0x00ff0000
+ .text
.global rpc_default_fiq_end
ENTRY(rpc_default_fiq_start)
mov r12, #ioc_base_high
diff --git a/arch/arm/mach-rpc/include/mach/entry-macro.S b/arch/arm/mach-rpc/include/mach/entry-macro.S
deleted file mode 100644
index a6d1a9f4bb79..000000000000
--- a/arch/arm/mach-rpc/include/mach/entry-macro.S
+++ /dev/null
@@ -1,13 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#include <mach/hardware.h>
-#include <asm/hardware/entry-macro-iomd.S>
-
- .equ ioc_base_high, IOC_BASE & 0xff000000
- .equ ioc_base_low, IOC_BASE & 0x00ff0000
-
- .macro get_irqnr_preamble, base, tmp
- mov \base, #ioc_base_high @ point at IOC
- .if ioc_base_low
- orr \base, \base, #ioc_base_low
- .endif
- .endm
diff --git a/arch/arm/mach-rpc/irq.c b/arch/arm/mach-rpc/irq.c
index 803aeb126f0e..dc29384b6ef8 100644
--- a/arch/arm/mach-rpc/irq.c
+++ b/arch/arm/mach-rpc/irq.c
@@ -14,6 +14,99 @@
#define CLR 0x04
#define MASK 0x08
+static const u8 irq_prio_h[256] = {
+ 0, 8, 9, 8,10,10,10,10,11,11,11,11,10,10,10,10,
+ 12, 8, 9, 8,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+ 14,14,14,14,10,10,10,10,11,11,11,11,10,10,10,10,
+ 14,14,14,14,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+ 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
+ 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+ 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
+ 15,15,15,15,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+ 13,13,13,13,10,10,10,10,11,11,11,11,10,10,10,10,
+};
+
+static const u8 irq_prio_d[256] = {
+ 0,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 20,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 23,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 23,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 22,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+ 21,16,17,16,18,16,17,16,19,16,17,16,18,16,17,16,
+};
+
+static const u8 irq_prio_l[256] = {
+ 0, 0, 1, 0, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
+ 4, 0, 1, 0, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3,
+ 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+};
+
+static int iomd_get_irq_nr(void)
+{
+ int irq;
+ u8 reg;
+
+ /* get highest priority first */
+ reg = readb(IOC_BASE + IOMD_IRQREQB);
+ irq = irq_prio_h[reg];
+ if (irq)
+ return irq;
+
+ /* get DMA */
+ reg = readb(IOC_BASE + IOMD_DMAREQ);
+ irq = irq_prio_d[reg];
+ if (irq)
+ return irq;
+
+ /* get low priority */
+ reg = readb(IOC_BASE + IOMD_IRQREQA);
+ irq = irq_prio_l[reg];
+ if (irq)
+ return irq;
+ return 0;
+}
+
+static void iomd_handle_irq(struct pt_regs *regs)
+{
+ int irq;
+
+ do {
+ irq = iomd_get_irq_nr();
+ if (irq)
+ generic_handle_irq(irq);
+ } while (irq);
+}
+
static void __iomem *iomd_get_base(struct irq_data *d)
{
void *cd = irq_data_get_irq_chip_data(d);
@@ -82,6 +175,8 @@ void __init rpc_init_irq(void)
set_fiq_handler(&rpc_default_fiq_start,
&rpc_default_fiq_end - &rpc_default_fiq_start);
+ set_handle_irq(iomd_handle_irq);
+
for (irq = 0; irq < NR_IRQS; irq++) {
clr = IRQ_NOREQUEST;
set = 0;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.