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Commit 6cec9b07 authored by Andreas Larsson's avatar Andreas Larsson Committed by Marc Kleine-Budde
Browse files

can: grcan: Add device driver for GRCAN and GRHCAN cores 



This driver supports GRCAN and CRHCAN CAN controllers available in the GRLIB
VHDL IP core library.

Signed-off-by: default avatarAndreas Larsson <andreas@gaisler.com>
Acked-by: default avatarWolfgang Grandegger <wg@grandegger.com>
Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
parent c70edb9e

Documentation/ABI/testing/sysfs-class-net-grcan

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What:		/sys/class/net/<iface>/grcan/enable0

Date:		October 2012

KernelVersion:	3.8

Contact:	Andreas Larsson <andreas@gaisler.com>

Description:

		Hardware configuration of physical interface 0. This file reads

		and writes the "Enable 0" bit of the configuration register.

		Possible values: 0 or 1. See the GRCAN chapter of the GRLIB IP

		core library documentation for details. The default value is 0

		or set by the module parameter grcan.enable0 and can be read at

		/sys/module/grcan/parameters/enable0.



What:		/sys/class/net/<iface>/grcan/enable1

Date:		October 2012

KernelVersion:	3.8

Contact:	Andreas Larsson <andreas@gaisler.com>

Description:

		Hardware configuration of physical interface 1. This file reads

		and writes the "Enable 1" bit of the configuration register.

		Possible values: 0 or 1. See the GRCAN chapter of the GRLIB IP

		core library documentation for details. The default value is 0

		or set by the module parameter grcan.enable1 and can be read at

		/sys/module/grcan/parameters/enable1.



What:		/sys/class/net/<iface>/grcan/select

Date:		October 2012

KernelVersion:	3.8

Contact:	Andreas Larsson <andreas@gaisler.com>

Description:

		Configuration of which physical interface to be used. Possible

		values: 0 or 1. See the GRCAN chapter of the GRLIB IP core

		library documentation for details. The default value is 0 or is

		set by the module parameter grcan.select and can be read at

		/sys/module/grcan/parameters/select.

Documentation/devicetree/bindings/net/can/grcan.txt

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Aeroflex Gaisler GRCAN and GRHCAN CAN controllers.



The GRCAN and CRHCAN CAN controllers are available in the GRLIB VHDL IP core

library.



Note: These properties are built from the AMBA plug&play in a Leon SPARC system

(the ordinary environment for GRCAN and GRHCAN). There are no dts files for

sparc.



Required properties:



- name : Should be "GAISLER_GRCAN", "01_03d", "GAISLER_GRHCAN" or "01_034"



- reg : Address and length of the register set for the device



- freq : Frequency of the external oscillator clock in Hz (the frequency of

	the amba bus in the ordinary case)



- interrupts : Interrupt number for this device



Optional properties:



- systemid : If not present or if the value of the least significant 16 bits

	of this 32-bit property is smaller than GRCAN_TXBUG_SAFE_GRLIB_VERSION

	a bug workaround is activated.



For further information look in the documentation for the GLIB IP core library:

http://www.gaisler.com/products/grlib/grip.pdf

Documentation/kernel-parameters.txt

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@@ -905,6 +905,24 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 
	gpt		[EFI] Forces disk with valid GPT signature but

			invalid Protective MBR to be treated as GPT.



	grcan.enable0=	[HW] Configuration of physical interface 0. Determines

			the "Enable 0" bit of the configuration register.

			Format: 0 | 1

			Default: 0

	grcan.enable1=	[HW] Configuration of physical interface 1. Determines

			the "Enable 0" bit of the configuration register.

			Format: 0 | 1

			Default: 0

	grcan.select=	[HW] Select which physical interface to use.

			Format: 0 | 1

			Default: 0

	grcan.txsize=	[HW] Sets the size of the tx buffer.

			Format: <unsigned int> such that (txsize & ~0x1fffc0) == 0.

			Default: 1024

	grcan.rxsize=	[HW] Sets the size of the rx buffer.

			Format: <unsigned int> such that (rxsize & ~0x1fffc0) == 0.

			Default: 1024



	hashdist=	[KNL,NUMA] Large hashes allocated during boot

			are distributed across NUMA nodes.  Defaults on

			for 64-bit NUMA, off otherwise.

drivers/net/can/Kconfig

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@@ -110,6 +110,15 @@ config PCH_CAN 
	  is an IOH for x86 embedded processor (Intel Atom E6xx series).

	  This driver can access CAN bus.



config CAN_GRCAN

	tristate "Aeroflex Gaisler GRCAN and GRHCAN CAN devices"

	depends on CAN_DEV && OF

	---help---

	  Say Y here if you want to use Aeroflex Gaisler GRCAN or GRHCAN.

	  Note that the driver supports little endian, even though little

	  endian syntheses of the cores would need some modifications on

	  the hardware level to work.



source "drivers/net/can/mscan/Kconfig"



source "drivers/net/can/sja1000/Kconfig"

drivers/net/can/Makefile

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@@ -22,5 +22,6 @@ obj-$(CONFIG_CAN_BFIN) += bfin_can.o 
obj-$(CONFIG_CAN_JANZ_ICAN3)	+= janz-ican3.o

obj-$(CONFIG_CAN_FLEXCAN)	+= flexcan.o

obj-$(CONFIG_PCH_CAN)		+= pch_can.o

obj-$(CONFIG_CAN_GRCAN)		+= grcan.o



ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG