From: Robin Holt <holt@sgi.com>
To: Robin Holt <holt@sgi.com>, Marc Kleine-Budde <mkl@pengutronix.de>,
Wolfgang Grandegger <wg@grandegger.com>,
U Bhaskar-B22300 <B22300@freescale.com>
Cc: socketcan-core@lists.berlios.de, ,
PPC list <linuxppc-dev@lists.ozlabs.org>,
Robin Holt <holt@sgi.com>,
netdev@vger.kernel.org
Subject: [PATCH 4/4] [powerpc] Add flexcan device support for p1010rdb.
Date: Tue, 9 Aug 2011 07:28:27 -0500 [thread overview]
Message-ID: <1312892907-20419-5-git-send-email-holt@sgi.com> (raw)
In-Reply-To: <1312892907-20419-1-git-send-email-holt@sgi.com>
I added a simple clock source for the p1010rdb so the flexcan driver
could determine a clock frequency. The p1010 can device only has an
oscillator of system bus frequency divided by 2.
Signed-off-by: Robin Holt <holt@sgi.com>
To: Marc Kleine-Budde <mkl@pengutronix.de>,
To: Wolfgang Grandegger <wg@grandegger.com>,
To: U Bhaskar-B22300 <B22300@freescale.com>
Cc: socketcan-core@lists.berlios.de,
Cc: netdev@vger.kernel.org,
Cc: PPC list <linuxppc-dev@lists.ozlabs.org>
---
arch/powerpc/platforms/85xx/Kconfig | 2 +
arch/powerpc/platforms/85xx/Makefile | 2 +
arch/powerpc/platforms/85xx/clock.c | 42 ++++++++++++++++++++++++++++++++
arch/powerpc/platforms/85xx/p1010rdb.c | 8 ++++++
4 files changed, 54 insertions(+), 0 deletions(-)
create mode 100644 arch/powerpc/platforms/85xx/clock.c
diff --git a/arch/powerpc/platforms/85xx/Kconfig b/arch/powerpc/platforms/85xx/Kconfig
index 498534c..c4304ae 100644
--- a/arch/powerpc/platforms/85xx/Kconfig
+++ b/arch/powerpc/platforms/85xx/Kconfig
@@ -70,6 +70,8 @@ config MPC85xx_RDB
config P1010_RDB
bool "Freescale P1010RDB"
select DEFAULT_UIMAGE
+ select HAVE_CAN_FLEXCAN if NET && CAN
+ select PPC_CLOCK if CAN_FLEXCAN
help
This option enables support for the MPC85xx RDB (P1010 RDB) board
diff --git a/arch/powerpc/platforms/85xx/Makefile b/arch/powerpc/platforms/85xx/Makefile
index a971b32..cc7f381 100644
--- a/arch/powerpc/platforms/85xx/Makefile
+++ b/arch/powerpc/platforms/85xx/Makefile
@@ -3,6 +3,8 @@
#
obj-$(CONFIG_SMP) += smp.o
+obj-$(CONFIG_PPC_CLOCK) += clock.o
+
obj-$(CONFIG_MPC8540_ADS) += mpc85xx_ads.o
obj-$(CONFIG_MPC8560_ADS) += mpc85xx_ads.o
obj-$(CONFIG_MPC85xx_CDS) += mpc85xx_cds.o
diff --git a/arch/powerpc/platforms/85xx/clock.c b/arch/powerpc/platforms/85xx/clock.c
new file mode 100644
index 0000000..a6fd2c8
--- /dev/null
+++ b/arch/powerpc/platforms/85xx/clock.c
@@ -0,0 +1,42 @@
+
+#include <linux/device.h>
+#include <linux/err.h>
+
+#include <asm/clk_interface.h>
+
+#include <sysdev/fsl_soc.h>
+
+/*
+ * p1010 needs to provide a clock source for the flexcan driver. The
+ * oscillator for the p1010 processor is only ever the system clock / 2.
+ */
+
+static struct clk *mpc85xx_clk_get(struct device *dev, const char *id)
+{
+ if (!dev)
+ return ERR_PTR(-ENOENT);
+
+ return NULL;
+}
+
+static void mpc85xx_clk_put(struct clk *clk)
+{
+ return;
+}
+
+static unsigned long mpc85xx_clk_get_rate(struct clk *clk)
+{
+ return fsl_get_sys_freq() / 2;
+}
+
+static struct clk_interface mpc85xx_clk_functions = {
+ .clk_get = mpc85xx_clk_get,
+ .clk_get_rate = mpc85xx_clk_get_rate,
+ .clk_put = mpc85xx_clk_put,
+};
+
+void __init mpc85xx_clk_init(void)
+{
+ clk_functions = mpc85xx_clk_functions;
+}
+
diff --git a/arch/powerpc/platforms/85xx/p1010rdb.c b/arch/powerpc/platforms/85xx/p1010rdb.c
index d7387fa..5e52122 100644
--- a/arch/powerpc/platforms/85xx/p1010rdb.c
+++ b/arch/powerpc/platforms/85xx/p1010rdb.c
@@ -81,6 +81,13 @@ static void __init p1010_rdb_setup_arch(void)
printk(KERN_INFO "P1010 RDB board from Freescale Semiconductor\n");
}
+extern void mpc85xx_clk_init(void);
+
+static void __init p1010_rdb_init(void)
+{
+ mpc85xx_clk_init();
+}
+
static struct of_device_id __initdata p1010rdb_ids[] = {
{ .type = "soc", },
{ .compatible = "soc", },
@@ -111,6 +118,7 @@ define_machine(p1010_rdb) {
.name = "P1010 RDB",
.probe = p1010_rdb_probe,
.setup_arch = p1010_rdb_setup_arch,
+ .init = p1010_rdb_init,
.init_IRQ = p1010_rdb_pic_init,
#ifdef CONFIG_PCI
.pcibios_fixup_bus = fsl_pcibios_fixup_bus,
--
1.7.2.1
next prev parent reply other threads:[~2011-08-09 12:28 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-09 12:28 [Patch 0/4] [flexcan/powerpc] Add support for powerpc flexcan (freescale p1010) -V8 Robin Holt
2011-08-09 12:28 ` [PATCH 1/4] [flexcan] Remove #include <mach/clock.h> Robin Holt
2011-08-09 12:28 ` [PATCH 2/4] [flexcan] Abstract off read/write for big/little endian Robin Holt
2011-08-09 12:28 ` [PATCH 3/4] [flexcan] Add of_match to platform_device definition Robin Holt
2011-08-09 12:28 ` Robin Holt [this message]
2011-08-09 13:00 ` [PATCH 4/4] [powerpc] Add flexcan device support for p1010rdb Wolfgang Grandegger
2011-08-09 14:45 ` U Bhaskar-B22300
2011-08-09 14:55 ` Robin Holt
2011-08-09 15:10 ` Wolfgang Grandegger
2011-08-09 15:11 ` Marc Kleine-Budde
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