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Diffstat (limited to 'arch/arm/mach-kirkwood/pcie.c')
-rw-r--r--arch/arm/mach-kirkwood/pcie.c25
1 files changed, 21 insertions, 4 deletions
diff --git a/arch/arm/mach-kirkwood/pcie.c b/arch/arm/mach-kirkwood/pcie.c
index f56a0118c1bb..f26d6cff8bab 100644
--- a/arch/arm/mach-kirkwood/pcie.c
+++ b/arch/arm/mach-kirkwood/pcie.c
@@ -11,6 +11,7 @@
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/slab.h>
+#include <linux/clk.h>
#include <video/vga.h>
#include <asm/irq.h>
#include <asm/mach/pci.h>
@@ -19,6 +20,23 @@
#include <plat/addr-map.h>
#include "common.h"
+static void kirkwood_enable_pcie_clk(const char *port)
+{
+ struct clk *clk;
+
+ clk = clk_get_sys("pcie", port);
+ if (IS_ERR(clk)) {
+ printk(KERN_ERR "PCIE clock %s missing\n", port);
+ return;
+ }
+ clk_prepare_enable(clk);
+ clk_put(clk);
+}
+
+/* This function is called very early in the boot when probing the
+ hardware to determine what we actually are, and what rate tclk is
+ ticking at. Hence calling kirkwood_enable_pcie_clk() is not
+ possible since the clk tree has not been created yet. */
void kirkwood_enable_pcie(void)
{
u32 curr = readl(CLOCK_GATING_CTRL);
@@ -26,7 +44,7 @@ void kirkwood_enable_pcie(void)
writel(curr | CGC_PEX0, CLOCK_GATING_CTRL);
}
-void __init kirkwood_pcie_id(u32 *dev, u32 *rev)
+void kirkwood_pcie_id(u32 *dev, u32 *rev)
{
kirkwood_enable_pcie();
*dev = orion_pcie_dev_id((void __iomem *)PCIE_VIRT_BASE);
@@ -163,7 +181,6 @@ static void __init pcie1_ioresources_init(struct pcie_port *pp)
static int __init kirkwood_pcie_setup(int nr, struct pci_sys_data *sys)
{
- extern unsigned int kirkwood_clk_ctrl;
struct pcie_port *pp;
int index;
@@ -182,11 +199,11 @@ static int __init kirkwood_pcie_setup(int nr, struct pci_sys_data *sys)
switch (index) {
case 0:
- kirkwood_clk_ctrl |= CGC_PEX0;
+ kirkwood_enable_pcie_clk("0");
pcie0_ioresources_init(pp);
break;
case 1:
- kirkwood_clk_ctrl |= CGC_PEX1;
+ kirkwood_enable_pcie_clk("1");
pcie1_ioresources_init(pp);
break;
default:
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