You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
73 lines
1.9 KiB
73 lines
1.9 KiB
From b1ab71156cd49b2389397d3be54b93fe394a1cb2 Mon Sep 17 00:00:00 2001
|
|
From: Maarten ter Huurne <maarten@treewalker.org>
|
|
Date: Tue, 9 Oct 2012 13:09:57 +0200
|
|
Subject: [PATCH 13/16] MIPS: JZ4740: Acquire and enable DMA controller clock
|
|
|
|
Previously, it was assumed that the DMA controller clock is not gated
|
|
when the kernel starts running. While that is the power-on state, it is
|
|
safer to not rely on that.
|
|
|
|
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
|
|
---
|
|
arch/mips/jz4740/clock.c | 2 +-
|
|
arch/mips/jz4740/dma.c | 24 ++++++++++++++++++++++--
|
|
2 files changed, 23 insertions(+), 3 deletions(-)
|
|
|
|
--- a/arch/mips/jz4740/clock.c
|
|
+++ b/arch/mips/jz4740/clock.c
|
|
@@ -921,4 +921,4 @@ static int jz4740_clock_init(void)
|
|
|
|
return 0;
|
|
}
|
|
-arch_initcall(jz4740_clock_init);
|
|
+postcore_initcall(jz4740_clock_init);
|
|
--- a/arch/mips/jz4740/dma.c
|
|
+++ b/arch/mips/jz4740/dma.c
|
|
@@ -16,6 +16,7 @@
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/spinlock.h>
|
|
+#include <linux/clk.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <linux/dma-mapping.h>
|
|
@@ -268,6 +269,7 @@ static irqreturn_t jz4740_dma_irq(int ir
|
|
|
|
static int jz4740_dma_init(void)
|
|
{
|
|
+ struct clk *clk;
|
|
unsigned int ret;
|
|
|
|
jz4740_dma_base = ioremap(JZ4740_DMAC_BASE_ADDR, 0x400);
|
|
@@ -277,11 +279,29 @@ static int jz4740_dma_init(void)
|
|
|
|
spin_lock_init(&jz4740_dma_lock);
|
|
|
|
- ret = request_irq(JZ4740_IRQ_DMAC, jz4740_dma_irq, 0, "DMA", NULL);
|
|
+ clk = clk_get(NULL, "dma");
|
|
+ if (IS_ERR(clk)) {
|
|
+ ret = PTR_ERR(clk);
|
|
+ printk(KERN_ERR "JZ4740 DMA: Failed to request clock: %d\n",
|
|
+ ret);
|
|
+ goto err_iounmap;
|
|
+ }
|
|
|
|
- if (ret)
|
|
+ ret = request_irq(JZ4740_IRQ_DMAC, jz4740_dma_irq, 0, "DMA", NULL);
|
|
+ if (ret) {
|
|
printk(KERN_ERR "JZ4740 DMA: Failed to request irq: %d\n", ret);
|
|
+ goto err_clkput;
|
|
+ }
|
|
+
|
|
+ clk_enable(clk);
|
|
+
|
|
+ return 0;
|
|
+
|
|
+err_clkput:
|
|
+ clk_put(clk);
|
|
|
|
+err_iounmap:
|
|
+ iounmap(jz4740_dma_base);
|
|
return ret;
|
|
}
|
|
arch_initcall(jz4740_dma_init);
|
|
|