From 88e9a93c9d53ddcf633aa07f14245da7f30408c2 Mon Sep 17 00:00:00 2001
From: Manuel Lauss <manuel.lauss@gmail.com>
Date: Thu, 20 Feb 2014 14:59:23 +0100
Subject: MIPS: Alchemy: Determine cohereny at runtime based on cpu type
All Alchemy chips have coherent DMA, but for example the USB or AC97
peripherals on the Au1000/1500/1100 are not.
This patch uses DMA_MAYBE_COHERENT on Alchemy and sets coherentio based
on CPU type.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Cc: Linux-MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/6576/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
arch/mips/alchemy/Kconfig | 5 -----
arch/mips/alchemy/common/setup.c | 10 ++++++++++
2 files changed, 10 insertions(+), 5 deletions(-)
(limited to 'arch/mips/alchemy')
diff --git a/arch/mips/alchemy/Kconfig b/arch/mips/alchemy/Kconfig
index 7032ac7ecd1b..41386723f9fa 100644
--- a/arch/mips/alchemy/Kconfig
+++ b/arch/mips/alchemy/Kconfig
@@ -20,7 +20,6 @@ choice
config MIPS_MTX1
bool "4G Systems MTX-1 board"
- select DMA_NONCOHERENT
select HW_HAS_PCI
select ALCHEMY_GPIOINT_AU1000
select SYS_SUPPORTS_LITTLE_ENDIAN
@@ -29,7 +28,6 @@ config MIPS_MTX1
config MIPS_DB1000
bool "Alchemy DB1000/DB1500/DB1100 PB1500/1100 boards"
select ALCHEMY_GPIOINT_AU1000
- select DMA_NONCOHERENT
select HW_HAS_PCI
select SYS_SUPPORTS_BIG_ENDIAN
select SYS_SUPPORTS_LITTLE_ENDIAN
@@ -39,13 +37,11 @@ config MIPS_DB1235
bool "Alchemy DB1200/PB1200/DB1300/DB1550/PB1550 boards"
select ARCH_REQUIRE_GPIOLIB
select HW_HAS_PCI
- select DMA_COHERENT
select SYS_SUPPORTS_LITTLE_ENDIAN
select SYS_HAS_EARLY_PRINTK
config MIPS_XXS1500
bool "MyCable XXS1500 board"
- select DMA_NONCOHERENT
select ALCHEMY_GPIOINT_AU1000
select SYS_SUPPORTS_LITTLE_ENDIAN
select SYS_HAS_EARLY_PRINTK
@@ -54,7 +50,6 @@ config MIPS_GPR
bool "Trapeze ITS GPR board"
select ALCHEMY_GPIOINT_AU1000
select HW_HAS_PCI
- select DMA_NONCOHERENT
select SYS_SUPPORTS_LITTLE_ENDIAN
select SYS_HAS_EARLY_PRINTK
diff --git a/arch/mips/alchemy/common/setup.c b/arch/mips/alchemy/common/setup.c
index 62b4e7bbeab9..566a1743f685 100644
--- a/arch/mips/alchemy/common/setup.c
+++ b/arch/mips/alchemy/common/setup.c
@@ -30,6 +30,7 @@
#include <linux/jiffies.h>
#include <linux/module.h>
+#include <asm/dma-coherence.h>
#include <asm/mipsregs.h>
#include <asm/time.h>
@@ -59,6 +60,15 @@ void __init plat_mem_setup(void)
/* Clear to obtain best system bus performance */
clear_c0_config(1 << 19); /* Clear Config[OD] */
+ hw_coherentio = 0;
+ coherentio = 1;
+ switch (alchemy_get_cputype()) {
+ case ALCHEMY_CPU_AU1000:
+ case ALCHEMY_CPU_AU1500:
+ case ALCHEMY_CPU_AU1100:
+ coherentio = 0;
+ }
+
board_setup(); /* board specific setup */
/* IO/MEM resources. */
--
cgit v1.2.3