[PATCH 2/4] MIPS: Loongson32: Add DeviceTree support
From: Jiaxun Yang
Date: Tue Mar 12 2019 - 05:16:02 EST
Initial DeviceTree support for loongson32
Also remove the old IRQ driver since it have been replaced
by generic LS1X_IRQ.
Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
---
arch/mips/Kconfig | 5 +-
arch/mips/loongson32/common/Makefile | 2 +-
arch/mips/loongson32/common/irq.c | 196 ---------------------------
arch/mips/loongson32/common/setup.c | 18 +++
4 files changed, 23 insertions(+), 198 deletions(-)
delete mode 100644 arch/mips/loongson32/common/irq.c
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index ddfb587c4744..15f8cc3c965f 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -437,6 +437,9 @@ config LASAT
config MACH_LOONGSON32
bool "Loongson-1 family of machines"
+ select USE_OF
+ select BUILTIN_DTB
+ select LS1X_IRQ
select SYS_SUPPORTS_ZBOOT
help
This enables support for the Loongson-1 family of machines.
@@ -3024,7 +3027,7 @@ endchoice
choice
prompt "Kernel command line type" if !CMDLINE_OVERRIDE
default MIPS_CMDLINE_FROM_DTB if USE_OF && !ATH79 && !MACH_INGENIC && \
- !MIPS_MALTA && \
+ !MACH_LOONGSON32 && !MIPS_MALTA && \
!CAVIUM_OCTEON_SOC
default MIPS_CMDLINE_FROM_BOOTLOADER
diff --git a/arch/mips/loongson32/common/Makefile b/arch/mips/loongson32/common/Makefile
index 723b4ce3b8f0..5b29badb0950 100644
--- a/arch/mips/loongson32/common/Makefile
+++ b/arch/mips/loongson32/common/Makefile
@@ -2,4 +2,4 @@
# Makefile for common code of loongson1 based machines.
#
-obj-y += time.o irq.o platform.o prom.o reset.o setup.o
+obj-y += time.o platform.o prom.o reset.o setup.o
diff --git a/arch/mips/loongson32/common/irq.c b/arch/mips/loongson32/common/irq.c
deleted file mode 100644
index 635a4abe1f48..000000000000
--- a/arch/mips/loongson32/common/irq.c
+++ /dev/null
@@ -1,196 +0,0 @@
-/*
- * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@xxxxxxxxx>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- */
-
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <asm/irq_cpu.h>
-
-#include <loongson1.h>
-#include <irq.h>
-
-#define LS1X_INTC_REG(n, x) \
- ((void __iomem *)KSEG1ADDR(LS1X_INTC_BASE + (n * 0x18) + (x)))
-
-#define LS1X_INTC_INTISR(n) LS1X_INTC_REG(n, 0x0)
-#define LS1X_INTC_INTIEN(n) LS1X_INTC_REG(n, 0x4)
-#define LS1X_INTC_INTSET(n) LS1X_INTC_REG(n, 0x8)
-#define LS1X_INTC_INTCLR(n) LS1X_INTC_REG(n, 0xc)
-#define LS1X_INTC_INTPOL(n) LS1X_INTC_REG(n, 0x10)
-#define LS1X_INTC_INTEDGE(n) LS1X_INTC_REG(n, 0x14)
-
-static void ls1x_irq_ack(struct irq_data *d)
-{
- unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f;
- unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5;
-
- __raw_writel(__raw_readl(LS1X_INTC_INTCLR(n))
- | (1 << bit), LS1X_INTC_INTCLR(n));
-}
-
-static void ls1x_irq_mask(struct irq_data *d)
-{
- unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f;
- unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5;
-
- __raw_writel(__raw_readl(LS1X_INTC_INTIEN(n))
- & ~(1 << bit), LS1X_INTC_INTIEN(n));
-}
-
-static void ls1x_irq_mask_ack(struct irq_data *d)
-{
- unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f;
- unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5;
-
- __raw_writel(__raw_readl(LS1X_INTC_INTIEN(n))
- & ~(1 << bit), LS1X_INTC_INTIEN(n));
- __raw_writel(__raw_readl(LS1X_INTC_INTCLR(n))
- | (1 << bit), LS1X_INTC_INTCLR(n));
-}
-
-static void ls1x_irq_unmask(struct irq_data *d)
-{
- unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f;
- unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5;
-
- __raw_writel(__raw_readl(LS1X_INTC_INTIEN(n))
- | (1 << bit), LS1X_INTC_INTIEN(n));
-}
-
-static int ls1x_irq_settype(struct irq_data *d, unsigned int type)
-{
- unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f;
- unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5;
-
- switch (type) {
- case IRQ_TYPE_LEVEL_HIGH:
- __raw_writel(__raw_readl(LS1X_INTC_INTPOL(n))
- | (1 << bit), LS1X_INTC_INTPOL(n));
- __raw_writel(__raw_readl(LS1X_INTC_INTEDGE(n))
- & ~(1 << bit), LS1X_INTC_INTEDGE(n));
- break;
- case IRQ_TYPE_LEVEL_LOW:
- __raw_writel(__raw_readl(LS1X_INTC_INTPOL(n))
- & ~(1 << bit), LS1X_INTC_INTPOL(n));
- __raw_writel(__raw_readl(LS1X_INTC_INTEDGE(n))
- & ~(1 << bit), LS1X_INTC_INTEDGE(n));
- break;
- case IRQ_TYPE_EDGE_RISING:
- __raw_writel(__raw_readl(LS1X_INTC_INTPOL(n))
- | (1 << bit), LS1X_INTC_INTPOL(n));
- __raw_writel(__raw_readl(LS1X_INTC_INTEDGE(n))
- | (1 << bit), LS1X_INTC_INTEDGE(n));
- break;
- case IRQ_TYPE_EDGE_FALLING:
- __raw_writel(__raw_readl(LS1X_INTC_INTPOL(n))
- & ~(1 << bit), LS1X_INTC_INTPOL(n));
- __raw_writel(__raw_readl(LS1X_INTC_INTEDGE(n))
- | (1 << bit), LS1X_INTC_INTEDGE(n));
- break;
- case IRQ_TYPE_EDGE_BOTH:
- __raw_writel(__raw_readl(LS1X_INTC_INTPOL(n))
- & ~(1 << bit), LS1X_INTC_INTPOL(n));
- __raw_writel(__raw_readl(LS1X_INTC_INTEDGE(n))
- | (1 << bit), LS1X_INTC_INTEDGE(n));
- break;
- case IRQ_TYPE_NONE:
- break;
- default:
- return -EINVAL;
- }
-
- return 0;
-}
-
-static struct irq_chip ls1x_irq_chip = {
- .name = "LS1X-INTC",
- .irq_ack = ls1x_irq_ack,
- .irq_mask = ls1x_irq_mask,
- .irq_mask_ack = ls1x_irq_mask_ack,
- .irq_unmask = ls1x_irq_unmask,
- .irq_set_type = ls1x_irq_settype,
-};
-
-static void ls1x_irq_dispatch(int n)
-{
- u32 int_status, irq;
-
- /* Get pending sources, masked by current enables */
- int_status = __raw_readl(LS1X_INTC_INTISR(n)) &
- __raw_readl(LS1X_INTC_INTIEN(n));
-
- if (int_status) {
- irq = LS1X_IRQ(n, __ffs(int_status));
- do_IRQ(irq);
- }
-}
-
-asmlinkage void plat_irq_dispatch(void)
-{
- unsigned int pending;
-
- pending = read_c0_cause() & read_c0_status() & ST0_IM;
-
- if (pending & CAUSEF_IP7)
- do_IRQ(TIMER_IRQ);
- else if (pending & CAUSEF_IP2)
- ls1x_irq_dispatch(0); /* INT0 */
- else if (pending & CAUSEF_IP3)
- ls1x_irq_dispatch(1); /* INT1 */
- else if (pending & CAUSEF_IP4)
- ls1x_irq_dispatch(2); /* INT2 */
- else if (pending & CAUSEF_IP5)
- ls1x_irq_dispatch(3); /* INT3 */
- else if (pending & CAUSEF_IP6)
- ls1x_irq_dispatch(4); /* INT4 */
- else
- spurious_interrupt();
-
-}
-
-static struct irqaction cascade_irqaction = {
- .handler = no_action,
- .name = "cascade",
- .flags = IRQF_NO_THREAD,
-};
-
-static void __init ls1x_irq_init(int base)
-{
- int n;
-
- /* Disable interrupts and clear pending,
- * setup all IRQs as high level triggered
- */
- for (n = 0; n < INTN; n++) {
- __raw_writel(0x0, LS1X_INTC_INTIEN(n));
- __raw_writel(0xffffffff, LS1X_INTC_INTCLR(n));
- __raw_writel(0xffffffff, LS1X_INTC_INTPOL(n));
- /* set DMA0, DMA1 and DMA2 to edge trigger */
- __raw_writel(n ? 0x0 : 0xe000, LS1X_INTC_INTEDGE(n));
- }
-
-
- for (n = base; n < NR_IRQS; n++) {
- irq_set_chip_and_handler(n, &ls1x_irq_chip,
- handle_level_irq);
- }
-
- setup_irq(INT0_IRQ, &cascade_irqaction);
- setup_irq(INT1_IRQ, &cascade_irqaction);
- setup_irq(INT2_IRQ, &cascade_irqaction);
- setup_irq(INT3_IRQ, &cascade_irqaction);
-#if defined(CONFIG_LOONGSON1_LS1C)
- setup_irq(INT4_IRQ, &cascade_irqaction);
-#endif
-}
-
-void __init arch_init_irq(void)
-{
- mips_cpu_irq_init();
- ls1x_irq_init(LS1X_IRQ_BASE);
-}
diff --git a/arch/mips/loongson32/common/setup.c b/arch/mips/loongson32/common/setup.c
index 1640744288ee..5ede65a79d6f 100644
--- a/arch/mips/loongson32/common/setup.c
+++ b/arch/mips/loongson32/common/setup.c
@@ -8,12 +8,30 @@
*/
#include <asm/bootinfo.h>
+#include <linux/init.h>
+#include <linux/irqchip.h>
+#include <linux/kernel.h>
+#include <linux/libfdt.h>
+#include <linux/of_fdt.h>
+#include <asm/prom.h>
+#include <asm/bootinfo.h>
#include <prom.h>
void __init plat_mem_setup(void)
{
add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);
+ __dt_setup_arch(__dtb_start);
+}
+
+void __init device_tree_init(void)
+{
+ unflatten_and_copy_device_tree();
+}
+
+void __init arch_init_irq(void)
+{
+ irqchip_init();
}
const char *get_system_type(void)
--
2.20.1