Subject: [PATCH] ppc44x:PHY fixup for USB on canyonlands board

From: Rupjyoti Sarmah <[email-masked]>
Date: Wed, 10 Nov 2010 17:07:15 +0530

This fix is a reset for USB PHY that requires some amount of time for power to be stable on Canyonlands.

Signed-off-by: Rupjyoti Sarmah <[email-masked]>
---
 arch/powerpc/boot/dts/canyonlands.dts     |   11 ++++
 arch/powerpc/platforms/44x/44x.h          |    5 ++
 arch/powerpc/platforms/44x/Kconfig        |    7 ++
 arch/powerpc/platforms/44x/Makefile       |    1 +
 arch/powerpc/platforms/44x/ppc44x_fixup.c |   90 +++++++++++++++++++++++++++++
 5 files changed, 114 insertions(+), 0 deletions(-)
 create mode 100644 arch/powerpc/platforms/44x/ppc44x_fixup.c

diff --git a/arch/powerpc/boot/dts/canyonlands.dts b/arch/powerpc/boot/dts/canyonlands.dts
index a303703..d6e9ba2 100644
--- a/arch/powerpc/boot/dts/canyonlands.dts
+++ b/arch/powerpc/boot/dts/canyonlands.dts
@@ -171,6 +171,11 @@
 				      0x5 0x4>;     /* AHBDMA */
 		};
 
+		CPLD: cpld@e1000000 {
+			compatible = "apm, ppc460ex-bcsr";
+			reg = <4 0xe1000000 0x9>;
+		};
+
 		POB0: opb {
 			compatible = "ibm,opb-460ex", "ibm,opb";
 			#address-cells = <1>;
@@ -320,6 +325,12 @@
 				interrupts = <0x3 0x4>;
 			};
 
+			GPIO0: gpio@ef600b00 {
+				compatible = "apm,ppc44x-gpio-base";
+				reg = <0xef600b00 0x00000048>;
+				gpio-controller;
+			};
+
 			ZMII0: emac-zmii@ef600d00 {
 				compatible = "ibm,zmii-460ex", "ibm,zmii";
 				reg = <0xef600d00 0x0000000c>;
diff --git a/arch/powerpc/platforms/44x/44x.h b/arch/powerpc/platforms/44x/44x.h
index dbc4d2b..bc2ab7a 100644
--- a/arch/powerpc/platforms/44x/44x.h
+++ b/arch/powerpc/platforms/44x/44x.h
@@ -4,4 +4,9 @@
 extern u8 as1_readb(volatile u8 __iomem  *addr);
 extern void as1_writeb(u8 data, volatile u8 __iomem *addr);
 
+#define BCSR_USB_EN	0x11
+#define GPIO0_OSRH	0xC
+#define GPIO0_TSRH	0x14
+#define GPIO0_ISR1H	0x34
+
 #endif /* __POWERPC_PLATFORMS_44X_44X_H */
diff --git a/arch/powerpc/platforms/44x/Kconfig b/arch/powerpc/platforms/44x/Kconfig
index 0f979c5..9ca4aaa 100644
--- a/arch/powerpc/platforms/44x/Kconfig
+++ b/arch/powerpc/platforms/44x/Kconfig
@@ -117,12 +117,19 @@ config CANYONLANDS
 	default n
 	select PPC44x_SIMPLE
 	select 460EX
+	select 44X_FIXUP
 	select PCI
 	select PPC4xx_PCI_EXPRESS
 	select IBM_NEW_EMAC_RGMII
 	select IBM_NEW_EMAC_ZMII
 	help
 	  This option enables support for the AMCC PPC460EX evaluation board.
+config 44X_FIXUP
+	bool "4xx_fixup"
+	depends on 44x
+	default n
+	help
+	  This option enables supporting APM PPC4XX based evaluation board fixups.
 
 config GLACIER
 	bool "Glacier"
diff --git a/arch/powerpc/platforms/44x/Makefile b/arch/powerpc/platforms/44x/Makefile
index 82ff326..d4bfb97 100644
--- a/arch/powerpc/platforms/44x/Makefile
+++ b/arch/powerpc/platforms/44x/Makefile
@@ -1,6 +1,7 @@
 obj-$(CONFIG_44x)	:= misc_44x.o idle.o
 obj-$(CONFIG_PPC44x_SIMPLE) += ppc44x_simple.o
 obj-$(CONFIG_EBONY)	+= ebony.o
+obj-$(CONFIG_44X_FIXUP) += ppc44x_fixup.o
 obj-$(CONFIG_SAM440EP) 	+= sam440ep.o
 obj-$(CONFIG_WARP)	+= warp.o
 obj-$(CONFIG_XILINX_VIRTEX_5_FXT) += virtex.o
diff --git a/arch/powerpc/platforms/44x/ppc44x_fixup.c b/arch/powerpc/platforms/44x/ppc44x_fixup.c
new file mode 100644
index 0000000..4e254eb
--- /dev/null
+++ b/arch/powerpc/platforms/44x/ppc44x_fixup.c
@@ -0,0 +1,90 @@
+/*
+ * This contain fixup code for Applied Micro ppc44x series of processors.
+ *
+ * Copyright (c) 2010, Applied Micro Circuits Corporation
+ * Author: Rupjyoti Sarmah <[email-masked]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include "44x.h"
+
+/* PHY fixup code on Canyonlands kit. */
+
+static int __init ppc460ex_canyonlands_fixup(void)
+{
+	u8 __iomem *bcsr ;
+	void __iomem  *vaddr;
+	struct device_node *np;
+	u32 val ;
+
+	np = of_find_compatible_node(NULL, NULL, "apm, ppc460ex-bcsr");
+	if (!np) {
+		printk(KERN_ERR "failed did not find apm, ppc460ex bcsr node\n");
+		return -ENODEV;
+		}
+
+	bcsr = of_iomap(np, 0);
+	of_node_put(np);
+
+	if (!bcsr) {
+		printk(KERN_CRIT "Could not remap bcsr\n");
+		return -ENODEV;
+	}
+
+	clrbits8(&bcsr[7], BCSR_USB_EN);
+	udelay(100000);
+
+	setbits8(&bcsr[7], BCSR_USB_EN);
+	udelay(100000);
+
+	clrbits8(&bcsr[7], BCSR_USB_EN);
+	udelay(100000);
+
+	np = of_find_compatible_node(NULL, NULL, "apm,ppc44x-gpio-base");
+
+	/* configure multiplexed gpio16 and gpio19 */
+
+	vaddr = of_iomap(np, 0);
+	if (!vaddr) {
+		printk(KERN_CRIT "Could not get gpio node address\n");
+		return -ENODEV;
+	}
+
+	/* configure gpio16 and gpio19 as alternate1 */
+
+	/* GPIO0_ISR1H for alternate 1 settings */
+	val = in_be32(vaddr + GPIO0_ISR1H);
+	out_be32((vaddr + GPIO0_ISR1H), val | 0x4200000);
+
+	/* GPIO0_OSRH for alternate 1 settings */
+	val = in_be32(vaddr + GPIO0_OSRH);
+	out_be32((vaddr + GPIO0_OSRH), val | 0x42000000);
+
+	/* GPIO0_TSRH for alternate 1 settings */
+	val = in_be32(vaddr + GPIO0_TSRH);
+	out_be32((vaddr + GPIO0_TSRH), val | 0x42000000);
+	of_node_put(np);
+	return 0;
+
+}
+arch_initcall(ppc460ex_canyonlands_fixup);
+
-- 
1.5.6.3