MIPS: BCM63XX: add and use a clock for PCIe

Add a PCIe clock and use that instead of directly touching the clock
control register. While at it, fail if there is no such clock.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Acked-by: Florian Fainelli <florian@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4452
Signed-off-by: John Crispin <blogic@openwrt.org>

1 files changed, 10 insertions, 5 deletions

diff --git a/arch/mips/pci/pci-bcm63xx.c b/arch/mips/pci/pci-bcm63xx.c
index 8a48139d219c..fa8c320936fe 100644
--- a/arch/mips/pci/pci-bcm63xx.c
+++ b/arch/mips/pci/pci-bcm63xx.c
@@ -11,6 +11,7 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/delay.h>
+#include <linux/clk.h>
 #include <asm/bootinfo.h>
 
 #include "pci-bcm63xx.h"
@@ -119,11 +120,6 @@ static void __init bcm63xx_reset_pcie(void)
 {
         u32 val;
 
-        /* enable clock */
-        val = bcm_perf_readl(PERF_CKCTL_REG);
-        val |= CKCTL_6328_PCIE_EN;
-        bcm_perf_writel(val, PERF_CKCTL_REG);
-
         /* enable SERDES */
         val = bcm_misc_readl(MISC_SERDES_CTRL_REG);
         val |= SERDES_PCIE_EN | SERDES_PCIE_EXD_EN;
@@ -150,10 +146,19 @@ static void __init bcm63xx_reset_pcie(void)
         mdelay(200);
 }
 
+static struct clk *pcie_clk;
+
 static int __init bcm63xx_register_pcie(void)
 {
         u32 val;
 
+        /* enable clock */
+        pcie_clk = clk_get(NULL, "pcie");
+        if (IS_ERR_OR_NULL(pcie_clk))
+                return -ENODEV;
+
+        clk_prepare_enable(pcie_clk);
+
         bcm63xx_reset_pcie();
 
         /* configure the PCIe bridge */