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authorManuel Lauss <manuel.lauss@gmail.com>2014-07-23 16:36:50 +0200
committerRalf Baechle <ralf@linux-mips.org>2014-07-30 14:09:21 +0200
commit3feae78416ae2c30f12c0a4bbe2e5dddf029510d (patch)
tree8c4c9394e1a58526815c05f17ff09d34c770eb7d /arch/mips/alchemy
parent5a2fb71e7329dbcefbd08db8e44055c72ed52e90 (diff)
downloadop-kernel-dev-3feae78416ae2c30f12c0a4bbe2e5dddf029510d.zip
op-kernel-dev-3feae78416ae2c30f12c0a4bbe2e5dddf029510d.tar.gz
MIPS: Alchemy: usb: use clk framework
Add use of the common clock framework to set and enable the 48MHz clock source for the onchip OHCI and UDC blocks. Tested on a DB1500. (Au1200 and Au1300 use an external 48MHz crystal). Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com> Cc: Linux-MIPS <linux-mips@linux-mips.org> Patchwork: https://patchwork.linux-mips.org/patch/7467/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/alchemy')
-rw-r--r--arch/mips/alchemy/common/usb.c47
1 files changed, 40 insertions, 7 deletions
diff --git a/arch/mips/alchemy/common/usb.c b/arch/mips/alchemy/common/usb.c
index d193dbe..297805a 100644
--- a/arch/mips/alchemy/common/usb.c
+++ b/arch/mips/alchemy/common/usb.c
@@ -9,6 +9,7 @@
*
*/
+#include <linux/clk.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
@@ -387,10 +388,25 @@ static inline void au1200_usb_init(void)
udelay(1000);
}
-static inline void au1000_usb_init(unsigned long rb, int reg)
+static inline int au1000_usb_init(unsigned long rb, int reg)
{
void __iomem *base = (void __iomem *)KSEG1ADDR(rb + reg);
unsigned long r = __raw_readl(base);
+ struct clk *c;
+
+ /* 48MHz check. Don't init if no one can provide it */
+ c = clk_get(NULL, "usbh_clk");
+ if (IS_ERR(c))
+ return -ENODEV;
+ if (clk_round_rate(c, 48000000) != 48000000) {
+ clk_put(c);
+ return -ENODEV;
+ }
+ if (clk_set_rate(c, 48000000)) {
+ clk_put(c);
+ return -ENODEV;
+ }
+ clk_put(c);
#if defined(__BIG_ENDIAN)
r |= USBHEN_BE;
@@ -400,6 +416,8 @@ static inline void au1000_usb_init(unsigned long rb, int reg)
__raw_writel(r, base);
wmb();
udelay(1000);
+
+ return 0;
}
@@ -407,8 +425,15 @@ static inline void __au1xx0_ohci_control(int enable, unsigned long rb, int creg)
{
void __iomem *base = (void __iomem *)KSEG1ADDR(rb);
unsigned long r = __raw_readl(base + creg);
+ struct clk *c = clk_get(NULL, "usbh_clk");
+
+ if (IS_ERR(c))
+ return;
if (enable) {
+ if (clk_prepare_enable(c))
+ goto out;
+
__raw_writel(r | USBHEN_CE, base + creg);
wmb();
udelay(1000);
@@ -423,7 +448,10 @@ static inline void __au1xx0_ohci_control(int enable, unsigned long rb, int creg)
} else {
__raw_writel(r & ~(USBHEN_CE | USBHEN_E), base + creg);
wmb();
+ clk_disable_unprepare(c);
}
+out:
+ clk_put(c);
}
static inline int au1000_usb_control(int block, int enable, unsigned long rb,
@@ -457,11 +485,11 @@ int alchemy_usb_control(int block, int enable)
case ALCHEMY_CPU_AU1500:
case ALCHEMY_CPU_AU1100:
ret = au1000_usb_control(block, enable,
- AU1000_USB_OHCI_PHYS_ADDR, AU1000_OHCICFG);
+ AU1000_USB_OHCI_PHYS_ADDR, AU1000_OHCICFG);
break;
case ALCHEMY_CPU_AU1550:
ret = au1000_usb_control(block, enable,
- AU1550_USB_OHCI_PHYS_ADDR, AU1550_OHCICFG);
+ AU1550_USB_OHCI_PHYS_ADDR, AU1550_OHCICFG);
break;
case ALCHEMY_CPU_AU1200:
ret = au1200_usb_control(block, enable);
@@ -569,14 +597,18 @@ static struct syscore_ops alchemy_usb_pm_ops = {
static int __init alchemy_usb_init(void)
{
+ int ret = 0;
+
switch (alchemy_get_cputype()) {
case ALCHEMY_CPU_AU1000:
case ALCHEMY_CPU_AU1500:
case ALCHEMY_CPU_AU1100:
- au1000_usb_init(AU1000_USB_OHCI_PHYS_ADDR, AU1000_OHCICFG);
+ ret = au1000_usb_init(AU1000_USB_OHCI_PHYS_ADDR,
+ AU1000_OHCICFG);
break;
case ALCHEMY_CPU_AU1550:
- au1000_usb_init(AU1550_USB_OHCI_PHYS_ADDR, AU1550_OHCICFG);
+ ret = au1000_usb_init(AU1550_USB_OHCI_PHYS_ADDR,
+ AU1550_OHCICFG);
break;
case ALCHEMY_CPU_AU1200:
au1200_usb_init();
@@ -586,8 +618,9 @@ static int __init alchemy_usb_init(void)
break;
}
- register_syscore_ops(&alchemy_usb_pm_ops);
+ if (!ret)
+ register_syscore_ops(&alchemy_usb_pm_ops);
- return 0;
+ return ret;
}
arch_initcall(alchemy_usb_init);
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