can: sja1000: generic OF platform bus driver

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>

5 files changed, 299 insertions, 0 deletions

diff --git a/Documentation/powerpc/dts-bindings/can/sja1000.txt b/Documentation/powerpc/dts-bindings/can/sja1000.txt
new file mode 100644
index 000000000000..d6d209ded937
--- /dev/null
+++ b/Documentation/powerpc/dts-bindings/can/sja1000.txt
@@ -0,0 +1,53 @@
+Memory mapped SJA1000 CAN controller from NXP (formerly Philips)
+
+Required properties:
+
+- compatible : should be "nxp,sja1000".
+
+- reg : should specify the chip select, address offset and size required
+        to map the registers of the SJA1000. The size is usually 0x80.
+
+- interrupts: property with a value describing the interrupt source
+        (number and sensitivity) required for the SJA1000.
+
+Optional properties:
+
+- nxp,external-clock-frequency : Frequency of the external oscillator
+        clock in Hz. Note that the internal clock frequency used by the
+        SJA1000 is half of that value. If not specified, a default value
+        of 16000000 (16 MHz) is used.
+
+- nxp,tx-output-mode : operation mode of the TX output control logic:
+        <0x0> : bi-phase output mode
+        <0x1> : normal output mode (default)
+        <0x2> : test output mode
+        <0x3> : clock output mode
+
+- nxp,tx-output-config : TX output pin configuration:
+        <0x01> : TX0 invert
+        <0x02> : TX0 pull-down (default)
+        <0x04> : TX0 pull-up
+        <0x06> : TX0 push-pull
+        <0x08> : TX1 invert
+        <0x10> : TX1 pull-down
+        <0x20> : TX1 pull-up
+        <0x30> : TX1 push-pull
+
+- nxp,clock-out-frequency : clock frequency in Hz on the CLKOUT pin.
+        If not specified or if the specified value is 0, the CLKOUT pin
+        will be disabled.
+
+- nxp,no-comparator-bypass : Allows to disable the CAN input comperator.
+
+For futher information, please have a look to the SJA1000 data sheet.
+
+Examples:
+
+can@3,100 {
+        compatible = "nxp,sja1000";
+        reg = <3 0x100 0x80>;
+        interrupts = <2 0>;
+        interrupt-parent = <&mpic>;
+        nxp,external-clock-frequency = <16000000>;
+};
+
diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index cfd6c5a285fa..d5e18812bf49 100644
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -51,6 +51,15 @@ config CAN_SJA1000_PLATFORM
           boards from Phytec (http://www.phytec.de) like the PCM027,
           PCM038.
 
+config CAN_SJA1000_OF_PLATFORM
+        depends on CAN_SJA1000 && PPC_OF
+        tristate "Generic OF Platform Bus based SJA1000 driver"
+        ---help---
+          This driver adds support for the SJA1000 chips connected to
+          the OpenFirmware "platform bus" found on embedded systems with
+          OpenFirmware bindings, e.g. if you have a PowerPC based system
+          you may want to enable this option.
+
 config CAN_EMS_PCI
         tristate "EMS CPC-PCI and CPC-PCIe Card"
         depends on PCI && CAN_SJA1000
diff --git a/drivers/net/can/sja1000/Makefile b/drivers/net/can/sja1000/Makefile
index d6c631f9e665..9d0c08da273c 100644
--- a/drivers/net/can/sja1000/Makefile
+++ b/drivers/net/can/sja1000/Makefile
@@ -4,6 +4,7 @@
 
 obj-$(CONFIG_CAN_SJA1000) += sja1000.o
 obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o
+obj-$(CONFIG_CAN_SJA1000_OF_PLATFORM) += sja1000_of_platform.o
 obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o
 obj-$(CONFIG_CAN_KVASER_PCI) += kvaser_pci.o
 
diff --git a/drivers/net/can/sja1000/sja1000_of_platform.c b/drivers/net/can/sja1000/sja1000_of_platform.c
new file mode 100644
index 000000000000..aa953fb4b8d0
--- /dev/null
+++ b/drivers/net/can/sja1000/sja1000_of_platform.c
@@ -0,0 +1,233 @@
+/*
+ * Driver for SJA1000 CAN controllers on the OpenFirmware platform bus
+ *
+ * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the version 2 of the GNU General Public License
+ * as published by the Free Software Foundation
+ *
+ * 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.
+ */
+
+/* This is a generic driver for SJA1000 chips on the OpenFirmware platform
+ * bus found on embedded PowerPC systems. You need a SJA1000 CAN 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 "Documentation/powerpc/dts-bindings/can/sja1000.txt" for further
+ * information.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/delay.h>
+#include <linux/can.h>
+#include <linux/can/dev.h>
+
+#include <linux/of_platform.h>
+#include <asm/prom.h>
+
+#include "sja1000.h"
+
+#define DRV_NAME "sja1000_of_platform"
+
+MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
+MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the OF platform bus");
+MODULE_LICENSE("GPL v2");
+
+#define SJA1000_OFP_CAN_CLOCK  (16000000 / 2)
+
+#define SJA1000_OFP_OCR        OCR_TX0_PULLDOWN
+#define SJA1000_OFP_CDR        (CDR_CBP | CDR_CLK_OFF)
+
+static u8 sja1000_ofp_read_reg(const struct sja1000_priv *priv, int reg)
+{
+        return in_8(priv->reg_base + reg);
+}
+
+static void sja1000_ofp_write_reg(const struct sja1000_priv *priv,
+                                  int reg, u8 val)
+{
+        out_8(priv->reg_base + reg, val);
+}
+
+static int __devexit sja1000_ofp_remove(struct of_device *ofdev)
+{
+        struct net_device *dev = dev_get_drvdata(&ofdev->dev);
+        struct sja1000_priv *priv = netdev_priv(dev);
+        struct device_node *np = ofdev->node;
+        struct resource res;
+
+        dev_set_drvdata(&ofdev->dev, NULL);
+
+        unregister_sja1000dev(dev);
+        free_sja1000dev(dev);
+        iounmap(priv->reg_base);
+        irq_dispose_mapping(dev->irq);
+
+        of_address_to_resource(np, 0, &res);
+        release_mem_region(res.start, resource_size(&res));
+
+        return 0;
+}
+
+static int __devinit sja1000_ofp_probe(struct of_device *ofdev,
+                                       const struct of_device_id *id)
+{
+        struct device_node *np = ofdev->node;
+        struct net_device *dev;
+        struct sja1000_priv *priv;
+        struct resource res;
+        const u32 *prop;
+        int err, irq, res_size, prop_size;
+        void __iomem *base;
+
+        err = of_address_to_resource(np, 0, &res);
+        if (err) {
+                dev_err(&ofdev->dev, "invalid address\n");
+                return err;
+        }
+
+        res_size = resource_size(&res);
+
+        if (!request_mem_region(res.start, res_size, DRV_NAME)) {
+                dev_err(&ofdev->dev, "couldn't request %#x..%#x\n",
+                        res.start, res.end);
+                return -EBUSY;
+        }
+
+        base = ioremap_nocache(res.start, res_size);
+        if (!base) {
+                dev_err(&ofdev->dev, "couldn't ioremap %#x..%#x\n",
+                        res.start, res.end);
+                err = -ENOMEM;
+                goto exit_release_mem;
+        }
+
+        irq = irq_of_parse_and_map(np, 0);
+        if (irq == NO_IRQ) {
+                dev_err(&ofdev->dev, "no irq found\n");
+                err = -ENODEV;
+                goto exit_unmap_mem;
+        }
+
+        dev = alloc_sja1000dev(0);
+        if (!dev) {
+                err = -ENOMEM;
+                goto exit_dispose_irq;
+        }
+
+        priv = netdev_priv(dev);
+
+        priv->read_reg = sja1000_ofp_read_reg;
+        priv->write_reg = sja1000_ofp_write_reg;
+
+        prop = of_get_property(np, "nxp,external-clock-frequency", &prop_size);
+        if (prop && (prop_size ==  sizeof(u32)))
+                priv->can.clock.freq = *prop / 2;
+        else
+                priv->can.clock.freq = SJA1000_OFP_CAN_CLOCK; /* default */
+
+        prop = of_get_property(np, "nxp,tx-output-mode", &prop_size);
+        if (prop && (prop_size == sizeof(u32)))
+                priv->ocr |= *prop & OCR_MODE_MASK;
+        else
+                priv->ocr |= OCR_MODE_NORMAL; /* default */
+
+        prop = of_get_property(np, "nxp,tx-output-config", &prop_size);
+        if (prop && (prop_size == sizeof(u32)))
+                priv->ocr |= (*prop << OCR_TX_SHIFT) & OCR_TX_MASK;
+        else
+                priv->ocr |= OCR_TX0_PULLDOWN; /* default */
+
+        prop = of_get_property(np, "nxp,clock-out-frequency", &prop_size);
+        if (prop && (prop_size == sizeof(u32)) && *prop) {
+                u32 divider = priv->can.clock.freq * 2 / *prop;
+
+                if (divider > 1)
+                        priv->cdr |= divider / 2 - 1;
+                else
+                        priv->cdr |= CDR_CLKOUT_MASK;
+        } else {
+                priv->cdr |= CDR_CLK_OFF; /* default */
+        }
+
+        prop = of_get_property(np, "nxp,no-comparator-bypass", NULL);
+        if (!prop)
+                priv->cdr |= CDR_CBP; /* default */
+
+        priv->irq_flags = IRQF_SHARED;
+        priv->reg_base = base;
+
+        dev->irq = irq;
+
+        dev_info(&ofdev->dev,
+                 "reg_base=0x%p irq=%d clock=%d ocr=0x%02x cdr=0x%02x\n",
+                 priv->reg_base, dev->irq, priv->can.clock.freq,
+                 priv->ocr, priv->cdr);
+
+        dev_set_drvdata(&ofdev->dev, dev);
+        SET_NETDEV_DEV(dev, &ofdev->dev);
+
+        err = register_sja1000dev(dev);
+        if (err) {
+                dev_err(&ofdev->dev, "registering %s failed (err=%d)\n",
+                        DRV_NAME, err);
+                goto exit_free_sja1000;
+        }
+
+        return 0;
+
+exit_free_sja1000:
+        free_sja1000dev(dev);
+exit_dispose_irq:
+        irq_dispose_mapping(irq);
+exit_unmap_mem:
+        iounmap(base);
+exit_release_mem:
+        release_mem_region(res.start, res_size);
+
+        return err;
+}
+
+static struct of_device_id __devinitdata sja1000_ofp_table[] = {
+        {.compatible = "nxp,sja1000"},
+        {},
+};
+
+static struct of_platform_driver sja1000_ofp_driver = {
+        .owner = THIS_MODULE,
+        .name = DRV_NAME,
+        .probe = sja1000_ofp_probe,
+        .remove = __devexit_p(sja1000_ofp_remove),
+        .match_table = sja1000_ofp_table,
+};
+
+static int __init sja1000_ofp_init(void)
+{
+        return of_register_platform_driver(&sja1000_ofp_driver);
+}
+module_init(sja1000_ofp_init);
+
+static void __exit sja1000_ofp_exit(void)
+{
+        return of_unregister_platform_driver(&sja1000_ofp_driver);
+};
+module_exit(sja1000_ofp_exit);
diff --git a/include/linux/can/platform/sja1000.h b/include/linux/can/platform/sja1000.h
index 37966e630ff5..01ee2aeb048d 100644
--- a/include/linux/can/platform/sja1000.h
+++ b/include/linux/can/platform/sja1000.h
@@ -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 */