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can: sja1000: generic OF platform bus driver

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This patch adds a generic driver for SJA1000 chips on the OpenFirmware
platform bus found on embedded PowerPC systems. You need a SJA1000 node
definition in your flattened device tree source (DTS) file similar to:

  can@3,100 {
  	compatible = "nxp,sja1000";
  	reg = <3 0x100 0x80>;
  	interrupts = <2 0>;
  	interrupt-parent = <&mpic>;
  	nxp,external-clock-frequency = <16000000>;
  };

See also Documentation/powerpc/dts-bindings/can/sja1000.txt.

CC: devicetree-discuss@ozlabs.org
Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wolfgang Grandegger
2009-05-30 07:55:50 +00:00
committed by David S. Miller
parent 255a915431
commit d1a277c584
5 changed files with 299 additions and 0 deletions
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3
include/linux/can/platform/sja1000.h
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@@ -13,6 +13,7 @@
#define OCR_MODE_TEST 0x01
#define OCR_MODE_NORMAL 0x02
#define OCR_MODE_CLOCK 0x03
#define OCR_MODE_MASK 0x07
#define OCR_TX0_INVERT 0x04
#define OCR_TX0_PULLDOWN 0x08
#define OCR_TX0_PULLUP 0x10
@@ -21,6 +22,8 @@
#define OCR_TX1_PULLDOWN 0x40
#define OCR_TX1_PULLUP 0x80
#define OCR_TX1_PUSHPULL 0xc0
#define OCR_TX_MASK 0xfc
#define OCR_TX_SHIFT 2
struct sja1000_platform_data {
u32 clock; /* CAN bus oscillator frequency in Hz */