Add FIQ support for cns3xxx

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

SVN-Revision: 33581

2 files changed, 430 insertions, 1 deletions

diff --git a/target/linux/cns3xxx/config-3.3 b/target/linux/cns3xxx/config-3.3
index a06ce24f27..8345888ad3 100644
--- a/target/linux/cns3xxx/config-3.3
+++ b/target/linux/cns3xxx/config-3.3
@@ -45,13 +45,13 @@ CONFIG_DEBUG_LL=y
 CONFIG_DEBUG_LL_UART_NONE=y
 # CONFIG_DEBUG_USER is not set
 CONFIG_DECOMPRESS_LZMA=y
-CONFIG_DMA_CACHE_RWFO=y
 # CONFIG_DWC_DEBUG is not set
 # CONFIG_DWC_DEVICE_ONLY is not set
 # CONFIG_DWC_HOST_ONLY is not set
 CONFIG_DWC_OTG_MODE=y
 CONFIG_EARLY_PRINTK=y
 CONFIG_EEPROM_AT24=y
+CONFIG_FIQ=y
 CONFIG_FRAME_POINTER=y
 CONFIG_GENERIC_BUG=y
 CONFIG_GENERIC_CLOCKEVENTS=y
diff --git a/target/linux/cns3xxx/patches-3.3/460-cns3xxx_fiq_support.patch b/target/linux/cns3xxx/patches-3.3/460-cns3xxx_fiq_support.patch
new file mode 100644
index 0000000000..5b1cd7cd96
--- /dev/null
+++ b/target/linux/cns3xxx/patches-3.3/460-cns3xxx_fiq_support.patch
@@ -0,0 +1,429 @@
+--- a/arch/arm/Kconfig
++++ b/arch/arm/Kconfig
+@@ -375,6 +375,7 @@ config ARCH_CNS3XXX
+ 	select PCI_DOMAINS if PCI
+ 	select HAVE_ARM_TWD
+ 	select HAVE_SMP
++	select FIQ
+ 	help
+ 	  Support for Cavium Networks CNS3XXX platform.
+ 
+--- a/arch/arm/kernel/fiq.c
++++ b/arch/arm/kernel/fiq.c
+@@ -49,6 +49,8 @@
+ 
+ static unsigned long no_fiq_insn;
+ 
++unsigned int fiq_number[2] = {0, 0};
++
+ /* Default reacquire function
+  * - we always relinquish FIQ control
+  * - we always reacquire FIQ control
+@@ -70,9 +72,12 @@ static struct fiq_handler *current_fiq =
+ 
+ int show_fiq_list(struct seq_file *p, int prec)
+ {
+-	if (current_fiq != &default_owner)
+-		seq_printf(p, "%*s:              %s\n", prec, "FIQ",
+-			current_fiq->name);
++	if (current_fiq != &default_owner) {
++		seq_printf(p, "%*s: ", prec, "FIQ");
++		seq_printf(p, "%10u ", fiq_number[0]);
++		seq_printf(p, "%10u ", fiq_number[1]);
++		seq_printf(p, "      %s\n", current_fiq->name);
++	}
+ 
+ 	return 0;
+ }
+--- a/arch/arm/kernel/smp.c
++++ b/arch/arm/kernel/smp.c
+@@ -400,13 +400,13 @@ void show_ipi_list(struct seq_file *p, i
+ 	unsigned int cpu, i;
+ 
+ 	for (i = 0; i < NR_IPI; i++) {
+-		seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
++		seq_printf(p, "%*s%u:", prec - 1, "IPI", i);
+ 
+ 		for_each_present_cpu(cpu)
+ 			seq_printf(p, "%10u ",
+ 				   __get_irq_stat(cpu, ipi_irqs[i]));
+ 
+-		seq_printf(p, " %s\n", ipi_types[i]);
++		seq_printf(p, "      %s\n", ipi_types[i]);
+ 	}
+ }
+ 
+--- a/arch/arm/mach-cns3xxx/Makefile
++++ b/arch/arm/mach-cns3xxx/Makefile
+@@ -2,6 +2,6 @@ obj-$(CONFIG_ARCH_CNS3XXX)		+= core.o pm
+ obj-$(CONFIG_PCI)			+= pcie.o
+ obj-$(CONFIG_MACH_CNS3420VB)		+= cns3420vb.o
+ obj-$(CONFIG_MACH_GW2388)		+= laguna.o
+-obj-$(CONFIG_SMP)			+= platsmp.o headsmp.o
++obj-$(CONFIG_SMP)			+= platsmp.o headsmp.o cns3xxx_fiq.o
+ obj-$(CONFIG_HOTPLUG_CPU)		+= hotplug.o
+ obj-$(CONFIG_LOCAL_TIMERS)		+= localtimer.o
+--- /dev/null
++++ b/arch/arm/mach-cns3xxx/cns3xxx_fiq.S
+@@ -0,0 +1,97 @@
++/*
++ *  linux/arch/arm/lib/floppydma.S
++ *
++ *  Copyright (C) 1995, 1996 Russell King
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 as
++ * published by the Free Software Foundation.
++ */
++#include <linux/linkage.h>
++#include <asm/assembler.h>
++#include <asm/asm-offsets.h>
++
++#define D_CACHE_LINE_SIZE 32
++
++	.text
++
++/*
++ * R8  - DMA Start Address
++ * R9  - DMA Length
++ * R10 - DMA Direction
++ * R11 - DMA type
++ * R12 - fiq_buffer Address
++ * R13 - DMA type Address
++*/
++
++	.global	cns3xxx_fiq_end
++ENTRY(cns3xxx_fiq_start)
++	mov r8, #0
++	str r8, [r13]
++
++	ldr r9, [r12]
++	ldr r8, [r9]
++	add r8, r8, #1
++	str r8, [r9]
++
++	ldmib r12, {r8, r9, r10}
++	and r11, r10, #0x3000000
++	and r10, r10, #0xff
++
++	teq r11, #0x1000000
++	beq cns3xxx_dma_map_area
++	teq r11, #0x2000000
++	beq cns3xxx_dma_unmap_area
++	b cns3xxx_dma_flush_range
++
++cns3xxx_fiq_exit:
++	mov r8, #0
++	str r8, [r12, #12]
++	mcr p15, 0, r8, c7, c10, 4    @ drain write buffer
++	subs pc, lr, #4
++
++cns3xxx_dma_map_area:
++	add r9, r9, r8
++	teq r10, #DMA_FROM_DEVICE
++	beq cns3xxx_dma_inv_range
++	b cns3xxx_dma_clean_range
++
++cns3xxx_dma_unmap_area:
++	add r9, r9, r8
++	teq r10, #DMA_TO_DEVICE
++	bne cns3xxx_dma_inv_range
++	b cns3xxx_fiq_exit
++
++cns3xxx_dma_flush_range:
++	bic r8, r8, #D_CACHE_LINE_SIZE - 1
++1:
++	mcr p15, 0, r8, c7, c14, 1   @ clean & invalidate D line
++	add r8, r8, #D_CACHE_LINE_SIZE
++	cmp r8, r9
++	blo 1b
++	b cns3xxx_fiq_exit
++
++cns3xxx_dma_clean_range:
++	bic r8, r8, #D_CACHE_LINE_SIZE - 1
++1:
++	mcr p15, 0, r8, c7, c10, 1    @ clean D line
++	add r8, r8, #D_CACHE_LINE_SIZE
++	cmp r8, r9
++	blo 1b
++	b cns3xxx_fiq_exit
++
++cns3xxx_dma_inv_range:
++	tst r8, #D_CACHE_LINE_SIZE - 1
++	bic r8, r8, #D_CACHE_LINE_SIZE - 1
++	mcrne p15, 0, r8, c7, c10, 1    @ clean D line
++	tst r9, #D_CACHE_LINE_SIZE - 1
++	bic r9, r9, #D_CACHE_LINE_SIZE - 1
++	mcrne p15, 0, r9, c7, c14, 1    @ clean & invalidate D line
++1:
++	mcr p15, 0, r8, c7, c6, 1   @ invalidate D line
++	add r8, r8, #D_CACHE_LINE_SIZE
++	cmp r8, r9
++	blo 1b
++	b cns3xxx_fiq_exit
++
++cns3xxx_fiq_end:
+--- a/arch/arm/mach-cns3xxx/include/mach/cns3xxx.h
++++ b/arch/arm/mach-cns3xxx/include/mach/cns3xxx.h
+@@ -294,6 +294,7 @@
+ #define MISC_PCIE_INT_MASK(x)			MISC_MEM_MAP(0x978 + (x) * 0x100)
+ #define MISC_PCIE_INT_STATUS(x)			MISC_MEM_MAP(0x97C + (x) * 0x100)
+ 
++#define MISC_FIQ_CPU(x)				MISC_MEM_MAP(0xA58 - (x) * 0x4)
+ /*
+  * Power management and clock control
+  */
+--- a/arch/arm/mach-cns3xxx/include/mach/irqs.h
++++ b/arch/arm/mach-cns3xxx/include/mach/irqs.h
+@@ -14,6 +14,7 @@
+ #define IRQ_LOCALTIMER		29
+ #define IRQ_LOCALWDOG		30
+ #define IRQ_TC11MP_GIC_START	32
++#define FIQ_START 0
+ 
+ #include <mach/cns3xxx.h>
+ 
+--- /dev/null
++++ b/arch/arm/mach-cns3xxx/include/mach/smp.h
+@@ -0,0 +1,8 @@
++#ifndef __MACH_SMP_H
++#define __MACH_SMP_H
++
++extern void smp_dma_map_area(const void *, size_t, int);
++extern void smp_dma_unmap_area(const void *, size_t, int);
++extern void smp_dma_flush_range(const void *, const void *);
++
++#endif
+--- a/arch/arm/mach-cns3xxx/platsmp.c
++++ b/arch/arm/mach-cns3xxx/platsmp.c
+@@ -24,10 +24,27 @@
+ #include <asm/hardware/gic.h>
+ #include <asm/smp_scu.h>
+ #include <asm/unified.h>
+-
++#include <asm/fiq.h>
++#include <mach/smp.h>
+ #include <mach/cns3xxx.h>
+ 
++static struct fiq_handler fh = {
++	.name = "cns3xxx-fiq"
++};
++
++static unsigned int fiq_buffer[8];
++
++#define FIQ_ENABLED         0x80000000
++#define FIQ_GENERATE				0x00010000
++#define CNS3XXX_MAP_AREA    0x01000000
++#define CNS3XXX_UNMAP_AREA  0x02000000
++#define CNS3XXX_FLUSH_RANGE 0x03000000
++
+ extern void cns3xxx_secondary_startup(void);
++extern unsigned char cns3xxx_fiq_start, cns3xxx_fiq_end;
++extern unsigned int fiq_number[2];
++extern struct cpu_cache_fns cpu_cache;
++struct cpu_cache_fns cpu_cache_save;
+ 
+ #define SCU_CPU_STATUS 0x08
+ static void __iomem *scu_base;
+@@ -38,12 +55,50 @@ static void __iomem *scu_base;
+  */
+ volatile int __cpuinitdata pen_release = -1;
+ 
++static void __init cns3xxx_set_fiq_regs(void)
++{
++	struct pt_regs FIQ_regs;
++	unsigned int cpu = smp_processor_id();
++
++	if (cpu) {
++		FIQ_regs.ARM_ip = (unsigned int)&fiq_buffer[4];
++		FIQ_regs.ARM_sp = (unsigned int)MISC_FIQ_CPU(0);
++	} else {
++		FIQ_regs.ARM_ip = (unsigned int)&fiq_buffer[0];
++		FIQ_regs.ARM_sp = (unsigned int)MISC_FIQ_CPU(1);
++	}
++	set_fiq_regs(&FIQ_regs);
++}
++
++static void __init cns3xxx_init_fiq(void)
++{
++	void *fiqhandler_start;
++	unsigned int fiqhandler_length;
++	int ret;
++
++	fiqhandler_start = &cns3xxx_fiq_start;
++	fiqhandler_length = &cns3xxx_fiq_end - &cns3xxx_fiq_start;
++
++	ret = claim_fiq(&fh);
++
++	if (ret) {
++		return;
++	}
++
++	set_fiq_handler(fiqhandler_start, fiqhandler_length);
++	fiq_buffer[0] = (unsigned int)&fiq_number[0];
++	fiq_buffer[3] = 0;
++	fiq_buffer[4] = (unsigned int)&fiq_number[1];
++	fiq_buffer[7] = 0;
++}
++
++
+ /*
+  * Write pen_release in a way that is guaranteed to be visible to all
+  * observers, irrespective of whether they're taking part in coherency
+  * or not.  This is necessary for the hotplug code to work reliably.
+  */
+-static void write_pen_release(int val)
++static void __cpuinit write_pen_release(int val)
+ {
+ 	pen_release = val;
+ 	smp_wmb();
+@@ -63,12 +118,25 @@ void __cpuinit platform_secondary_init(u
+ 	gic_secondary_init(0);
+ 
+ 	/*
++	 * Setup Secondary Core FIQ regs
++	 */
++	cns3xxx_set_fiq_regs();
++
++	/*
+ 	 * let the primary processor know we're out of the
+ 	 * pen, then head off into the C entry point
+ 	 */
+ 	write_pen_release(-1);
+ 
+ 	/*
++	 * Fixup DMA Operations
++	 *
++	 */
++	cpu_cache.dma_map_area = (void *)smp_dma_map_area;
++	cpu_cache.dma_unmap_area = (void *)smp_dma_unmap_area;
++	cpu_cache.dma_flush_range = (void *)smp_dma_flush_range;
++	
++	/*
+ 	 * Synchronise with the boot thread.
+ 	 */
+ 	spin_lock(&boot_lock);
+@@ -171,4 +239,112 @@ void __init platform_smp_prepare_cpus(un
+ 	 */
+ 	__raw_writel(virt_to_phys(cns3xxx_secondary_startup),
+ 			(void __iomem *)(CNS3XXX_MISC_BASE_VIRT + 0x0600));
++
++	/*
++	 * Setup FIQ's for main cpu
++	 */
++	cns3xxx_init_fiq();
++	cns3xxx_set_fiq_regs();
++	memcpy((void *)&cpu_cache_save, (void *)&cpu_cache, sizeof(struct cpu_cache_fns));
++}
++
++
++static inline unsigned long cns3xxx_cpu_id(void)
++{
++	unsigned long cpu;
++
++	asm volatile(
++		" mrc p15, 0, %0, c0, c0, 5  @ cns3xxx_cpu_id\n"
++		: "=r" (cpu) : : "memory", "cc");
++	return (cpu & 0xf);
++}
++
++void smp_dma_map_area(const void *addr, size_t size, int dir)
++{
++	unsigned int cpu;
++	unsigned long flags;
++	raw_local_irq_save(flags);
++	cpu = cns3xxx_cpu_id();
++	if (cpu) {
++		fiq_buffer[1] = (unsigned int)addr;
++		fiq_buffer[2] = size;
++		fiq_buffer[3] = dir | CNS3XXX_MAP_AREA | FIQ_ENABLED;
++		smp_mb();
++		__raw_writel(FIQ_GENERATE, MISC_FIQ_CPU(1));
++
++		cpu_cache_save.dma_map_area(addr, size, dir);
++		while ((fiq_buffer[3]) & FIQ_ENABLED) { barrier(); }
++	} else {
++
++		fiq_buffer[5] = (unsigned int)addr;
++		fiq_buffer[6] = size;
++		fiq_buffer[7] = dir | CNS3XXX_MAP_AREA | FIQ_ENABLED;
++		smp_mb();
++		__raw_writel(FIQ_GENERATE, MISC_FIQ_CPU(0));
++
++		cpu_cache_save.dma_map_area(addr, size, dir);
++		while ((fiq_buffer[7]) & FIQ_ENABLED) { barrier(); }
++	}
++	raw_local_irq_restore(flags);
++}
++
++void smp_dma_unmap_area(const void *addr, size_t size, int dir)
++{
++	unsigned int cpu;
++	unsigned long flags;
++
++	raw_local_irq_save(flags);
++	cpu = cns3xxx_cpu_id();
++	if (cpu) {
++
++		fiq_buffer[1] = (unsigned int)addr;
++		fiq_buffer[2] = size;
++		fiq_buffer[3] = dir | CNS3XXX_UNMAP_AREA | FIQ_ENABLED;
++		smp_mb();
++		__raw_writel(FIQ_GENERATE, MISC_FIQ_CPU(1));
++
++		cpu_cache_save.dma_unmap_area(addr, size, dir);
++		while ((fiq_buffer[3]) & FIQ_ENABLED) { barrier(); }
++	} else {
++
++		fiq_buffer[5] = (unsigned int)addr;
++		fiq_buffer[6] = size;
++		fiq_buffer[7] = dir | CNS3XXX_UNMAP_AREA | FIQ_ENABLED;
++		smp_mb();
++		__raw_writel(FIQ_GENERATE, MISC_FIQ_CPU(0));
++
++		cpu_cache_save.dma_unmap_area(addr, size, dir);
++		while ((fiq_buffer[7]) & FIQ_ENABLED) { barrier(); }
++	}
++	raw_local_irq_restore(flags);
++}
++
++void smp_dma_flush_range(const void *start, const void *end)
++{
++	unsigned int cpu;
++	unsigned long flags;
++	raw_local_irq_save(flags);
++	cpu = cns3xxx_cpu_id();
++	if (cpu) {
++
++		fiq_buffer[1] = (unsigned int)start;
++		fiq_buffer[2] = (unsigned int)end;
++		fiq_buffer[3] = CNS3XXX_FLUSH_RANGE | FIQ_ENABLED;
++		smp_mb();
++		__raw_writel(FIQ_GENERATE, MISC_FIQ_CPU(1));
++
++		cpu_cache_save.dma_flush_range(start, end);
++		while ((fiq_buffer[3]) & FIQ_ENABLED) { barrier(); }
++	} else {
++
++		fiq_buffer[5] = (unsigned int)start;
++		fiq_buffer[6] = (unsigned int)end;
++		fiq_buffer[7] = CNS3XXX_FLUSH_RANGE | FIQ_ENABLED;
++		smp_mb();
++		__raw_writel(FIQ_GENERATE, MISC_FIQ_CPU(0));
++
++		cpu_cache_save.dma_flush_range(start, end);
++		while ((fiq_buffer[7]) & FIQ_ENABLED) { barrier(); }
++	}
++	raw_local_irq_restore(flags);
+ }
+--- a/arch/arm/mm/Kconfig
++++ b/arch/arm/mm/Kconfig
+@@ -793,7 +793,7 @@ config NEEDS_SYSCALL_FOR_CMPXCHG
+ 
+ config DMA_CACHE_RWFO
+ 	bool "Enable read/write for ownership DMA cache maintenance"
+-	depends on CPU_V6K && SMP
++	depends on CPU_V6K && SMP && !ARCH_CNS3XXX
+ 	default y
+ 	help
+ 	  The Snoop Control Unit on ARM11MPCore does not detect the