3 files changed, 280 insertions, 0 deletions

diff --git a/drivers/net/can/cc770/Kconfig b/drivers/net/can/cc770/Kconfig
index 28e4d4810f44..22c07a8c8b43 100644
--- a/drivers/net/can/cc770/Kconfig
+++ b/drivers/net/can/cc770/Kconfig
@@ -11,4 +11,11 @@ config CAN_CC770_ISA
           connected to the ISA bus using I/O port, memory mapped or
           indirect access.
 
+config CAN_CC770_PLATFORM
+        tristate "Generic Platform Bus based CC770 driver"
+        ---help---
+          This driver adds support for the CC770 and AN82527 chips
+          connected to the "platform bus" (Linux abstraction for directly
+          to the processor attached devices).
+
 endif
diff --git a/drivers/net/can/cc770/Makefile b/drivers/net/can/cc770/Makefile
index 872ecffa80b7..9fb8321b33eb 100644
--- a/drivers/net/can/cc770/Makefile
+++ b/drivers/net/can/cc770/Makefile
@@ -4,5 +4,6 @@
 
 obj-$(CONFIG_CAN_CC770) += cc770.o
 obj-$(CONFIG_CAN_CC770_ISA) += cc770_isa.o
+obj-$(CONFIG_CAN_CC770_PLATFORM) += cc770_platform.o
 
 ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
diff --git a/drivers/net/can/cc770/cc770_platform.c b/drivers/net/can/cc770/cc770_platform.c
new file mode 100644
index 000000000000..53115eee8075
--- /dev/null
+++ b/drivers/net/can/cc770/cc770_platform.c
@@ -0,0 +1,272 @@
+/*
+ * Driver for CC770 and AN82527 CAN controllers on the platform bus
+ *
+ * Copyright (C) 2009, 2011 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.
+ */
+
+/*
+ * If platform data are used you should have similar definitions
+ * in your board-specific code:
+ *
+ *   static struct cc770_platform_data myboard_cc770_pdata = {
+ *           .osc_freq = 16000000,
+ *           .cir = 0x41,
+ *           .cor = 0x20,
+ *           .bcr = 0x40,
+ *   };
+ *
+ * Please see include/linux/can/platform/cc770.h for description of
+ * above fields.
+ *
+ * If the device tree is used, you need a CAN node definition in your
+ * DTS file similar to:
+ *
+ *   can@3,100 {
+ *           compatible = "bosch,cc770";
+ *           reg = <3 0x100 0x80>;
+ *           interrupts = <2 0>;
+ *           interrupt-parent = <&mpic>;
+ *           bosch,external-clock-frequency = <16000000>;
+ *   };
+ *
+ * See "Documentation/devicetree/bindings/net/can/cc770.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/platform_device.h>
+#include <linux/of.h>
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/platform/cc770.h>
+
+#include "cc770.h"
+
+#define DRV_NAME "cc770_platform"
+
+MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
+MODULE_DESCRIPTION("Socket-CAN driver for CC770 on the platform bus");
+MODULE_LICENSE("GPL v2");
+
+#define CC770_PLATFORM_CAN_CLOCK  16000000
+
+static u8 cc770_platform_read_reg(const struct cc770_priv *priv, int reg)
+{
+        return ioread8(priv->reg_base + reg);
+}
+
+static void cc770_platform_write_reg(const struct cc770_priv *priv, int reg,
+                                     u8 val)
+{
+        iowrite8(val, priv->reg_base + reg);
+}
+
+static int __devinit cc770_get_of_node_data(struct platform_device *pdev,
+                                            struct cc770_priv *priv)
+{
+        struct device_node *np = pdev->dev.of_node;
+        const u32 *prop;
+        int prop_size;
+        u32 clkext;
+
+        prop = of_get_property(np, "bosch,external-clock-frequency",
+                               &prop_size);
+        if (prop && (prop_size ==  sizeof(u32)))
+                clkext = *prop;
+        else
+                clkext = CC770_PLATFORM_CAN_CLOCK; /* default */
+        priv->can.clock.freq = clkext;
+
+        /* The system clock may not exceed 10 MHz */
+        if (priv->can.clock.freq > 10000000) {
+                priv->cpu_interface |= CPUIF_DSC;
+                priv->can.clock.freq /= 2;
+        }
+
+        /* The memory clock may not exceed 8 MHz */
+        if (priv->can.clock.freq > 8000000)
+                priv->cpu_interface |= CPUIF_DMC;
+
+        if (of_get_property(np, "bosch,divide-memory-clock", NULL))
+                priv->cpu_interface |= CPUIF_DMC;
+        if (of_get_property(np, "bosch,iso-low-speed-mux", NULL))
+                priv->cpu_interface |= CPUIF_MUX;
+
+        if (!of_get_property(np, "bosch,no-comperator-bypass", NULL))
+                priv->bus_config |= BUSCFG_CBY;
+        if (of_get_property(np, "bosch,disconnect-rx0-input", NULL))
+                priv->bus_config |= BUSCFG_DR0;
+        if (of_get_property(np, "bosch,disconnect-rx1-input", NULL))
+                priv->bus_config |= BUSCFG_DR1;
+        if (of_get_property(np, "bosch,disconnect-tx1-output", NULL))
+                priv->bus_config |= BUSCFG_DT1;
+        if (of_get_property(np, "bosch,polarity-dominant", NULL))
+                priv->bus_config |= BUSCFG_POL;
+
+        prop = of_get_property(np, "bosch,clock-out-frequency", &prop_size);
+        if (prop && (prop_size == sizeof(u32)) && *prop > 0) {
+                u32 cdv = clkext / *prop;
+                int slew;
+
+                if (cdv > 0 && cdv < 16) {
+                        priv->cpu_interface |= CPUIF_CEN;
+                        priv->clkout |= (cdv - 1) & CLKOUT_CD_MASK;
+
+                        prop = of_get_property(np, "bosch,slew-rate",
+                                               &prop_size);
+                        if (prop && (prop_size == sizeof(u32))) {
+                                slew = *prop;
+                        } else {
+                                /* Determine default slew rate */
+                                slew = (CLKOUT_SL_MASK >>
+                                        CLKOUT_SL_SHIFT) -
+                                        ((cdv * clkext - 1) / 8000000);
+                                if (slew < 0)
+                                        slew = 0;
+                        }
+                        priv->clkout |= (slew << CLKOUT_SL_SHIFT) &
+                                CLKOUT_SL_MASK;
+                } else {
+                        dev_dbg(&pdev->dev, "invalid clock-out-frequency\n");
+                }
+        }
+
+        return 0;
+}
+
+static int __devinit cc770_get_platform_data(struct platform_device *pdev,
+                                             struct cc770_priv *priv)
+{
+
+        struct cc770_platform_data *pdata = pdev->dev.platform_data;
+
+        priv->can.clock.freq = pdata->osc_freq;
+        if (priv->cpu_interface | CPUIF_DSC)
+                priv->can.clock.freq /= 2;
+        priv->clkout = pdata->cor;
+        priv->bus_config = pdata->bcr;
+        priv->cpu_interface = pdata->cir;
+
+        return 0;
+}
+
+static int __devinit cc770_platform_probe(struct platform_device *pdev)
+{
+        struct net_device *dev;
+        struct cc770_priv *priv;
+        struct resource *mem;
+        resource_size_t mem_size;
+        void __iomem *base;
+        int err, irq;
+
+        mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        irq = platform_get_irq(pdev, 0);
+        if (!mem || irq <= 0)
+                return -ENODEV;
+
+        mem_size = resource_size(mem);
+        if (!request_mem_region(mem->start, mem_size, pdev->name))
+                return -EBUSY;
+
+        base = ioremap(mem->start, mem_size);
+        if (!base) {
+                err = -ENOMEM;
+                goto exit_release_mem;
+        }
+
+        dev = alloc_cc770dev(0);
+        if (!dev) {
+                err = -ENOMEM;
+                goto exit_unmap_mem;
+        }
+
+        dev->irq = irq;
+        priv = netdev_priv(dev);
+        priv->read_reg = cc770_platform_read_reg;
+        priv->write_reg = cc770_platform_write_reg;
+        priv->irq_flags = IRQF_SHARED;
+        priv->reg_base = base;
+
+        if (pdev->dev.of_node)
+                err = cc770_get_of_node_data(pdev, priv);
+        else if (pdev->dev.platform_data)
+                err = cc770_get_platform_data(pdev, priv);
+        else
+                err = -ENODEV;
+        if (err)
+                goto exit_free_cc770;
+
+        dev_dbg(&pdev->dev,
+                 "reg_base=0x%p irq=%d clock=%d cpu_interface=0x%02x "
+                 "bus_config=0x%02x clkout=0x%02x\n",
+                 priv->reg_base, dev->irq, priv->can.clock.freq,
+                 priv->cpu_interface, priv->bus_config, priv->clkout);
+
+        dev_set_drvdata(&pdev->dev, dev);
+        SET_NETDEV_DEV(dev, &pdev->dev);
+
+        err = register_cc770dev(dev);
+        if (err) {
+                dev_err(&pdev->dev,
+                        "couldn't register CC700 device (err=%d)\n", err);
+                goto exit_free_cc770;
+        }
+
+        return 0;
+
+exit_free_cc770:
+        free_cc770dev(dev);
+exit_unmap_mem:
+        iounmap(base);
+exit_release_mem:
+        release_mem_region(mem->start, mem_size);
+
+        return err;
+}
+
+static int __devexit cc770_platform_remove(struct platform_device *pdev)
+{
+        struct net_device *dev = dev_get_drvdata(&pdev->dev);
+        struct cc770_priv *priv = netdev_priv(dev);
+        struct resource *mem;
+
+        unregister_cc770dev(dev);
+        iounmap(priv->reg_base);
+        free_cc770dev(dev);
+
+        mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        release_mem_region(mem->start, resource_size(mem));
+
+        return 0;
+}
+
+static struct of_device_id __devinitdata cc770_platform_table[] = {
+        {.compatible = "bosch,cc770"}, /* CC770 from Bosch */
+        {.compatible = "intc,82527"},  /* AN82527 from Intel CP */
+        {},
+};
+
+static struct platform_driver cc770_platform_driver = {
+        .driver = {
+                .name = DRV_NAME,
+                .owner = THIS_MODULE,
+                .of_match_table = cc770_platform_table,
+        },
+        .probe = cc770_platform_probe,
+        .remove = __devexit_p(cc770_platform_remove),
+};
+
+module_platform_driver(cc770_platform_driver);