can: sja1000: fuse of_platform into platform
The OpenFirmware probe can be merged into the standard platform probe to leverage common code. Signed-off-by: Florian Vaussard <florian.vaussard@epfl.ch> Tested-by: Andreas Larsson <andreas@gaisler.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>wifi-calibration
Florian Vaussard
Marc Kleine-Budde
parent
342180f7dc
commit
02729c3d08
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@ -17,16 +17,9 @@ config CAN_SJA1000_PLATFORM
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the "platform bus" (Linux abstraction for directly to the
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processor attached devices). Which can be found on various
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boards from Phytec (http://www.phytec.de) like the PCM027,
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PCM038.
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config CAN_SJA1000_OF_PLATFORM
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tristate "Generic OF Platform Bus based SJA1000 driver"
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depends on OF
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---help---
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This driver adds support for the SJA1000 chips connected to
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the OpenFirmware "platform bus" found on embedded systems with
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OpenFirmware bindings, e.g. if you have a PowerPC based system
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you may want to enable this option.
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PCM038. It also provides the OpenFirmware "platform bus" found
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on embedded systems with OpenFirmware bindings, e.g. if you
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have a PowerPC based system you may want to enable this option.
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config CAN_EMS_PCMCIA
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tristate "EMS CPC-CARD Card"
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@ -5,7 +5,6 @@
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obj-$(CONFIG_CAN_SJA1000) += sja1000.o
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obj-$(CONFIG_CAN_SJA1000_ISA) += sja1000_isa.o
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obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o
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obj-$(CONFIG_CAN_SJA1000_OF_PLATFORM) += sja1000_of_platform.o
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obj-$(CONFIG_CAN_EMS_PCMCIA) += ems_pcmcia.o
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obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o
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obj-$(CONFIG_CAN_KVASER_PCI) += kvaser_pci.o
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@ -1,220 +0,0 @@
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/*
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* Driver for SJA1000 CAN controllers on the OpenFirmware platform bus
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*
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* Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the version 2 of the GNU General Public License
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/* This is a generic driver for SJA1000 chips on the OpenFirmware platform
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* bus found on embedded PowerPC systems. You need a SJA1000 CAN node
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* definition in your flattened device tree source (DTS) file similar to:
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*
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* can@3,100 {
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* compatible = "nxp,sja1000";
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* reg = <3 0x100 0x80>;
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* interrupts = <2 0>;
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* interrupt-parent = <&mpic>;
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* nxp,external-clock-frequency = <16000000>;
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* };
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*
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* See "Documentation/devicetree/bindings/net/can/sja1000.txt" for further
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* information.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/netdevice.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/can/dev.h>
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#include <linux/of_platform.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include "sja1000.h"
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#define DRV_NAME "sja1000_of_platform"
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MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
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MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the OF platform bus");
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MODULE_LICENSE("GPL v2");
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#define SJA1000_OFP_CAN_CLOCK (16000000 / 2)
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#define SJA1000_OFP_OCR OCR_TX0_PULLDOWN
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#define SJA1000_OFP_CDR (CDR_CBP | CDR_CLK_OFF)
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static u8 sja1000_ofp_read_reg(const struct sja1000_priv *priv, int reg)
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{
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return ioread8(priv->reg_base + reg);
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}
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static void sja1000_ofp_write_reg(const struct sja1000_priv *priv,
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int reg, u8 val)
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{
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iowrite8(val, priv->reg_base + reg);
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}
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static int sja1000_ofp_remove(struct platform_device *ofdev)
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{
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struct net_device *dev = platform_get_drvdata(ofdev);
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struct sja1000_priv *priv = netdev_priv(dev);
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struct device_node *np = ofdev->dev.of_node;
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struct resource res;
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unregister_sja1000dev(dev);
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free_sja1000dev(dev);
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iounmap(priv->reg_base);
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irq_dispose_mapping(dev->irq);
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of_address_to_resource(np, 0, &res);
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release_mem_region(res.start, resource_size(&res));
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return 0;
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}
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static int sja1000_ofp_probe(struct platform_device *ofdev)
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{
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struct device_node *np = ofdev->dev.of_node;
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struct net_device *dev;
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struct sja1000_priv *priv;
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struct resource res;
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u32 prop;
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int err, irq, res_size;
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void __iomem *base;
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err = of_address_to_resource(np, 0, &res);
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if (err) {
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dev_err(&ofdev->dev, "invalid address\n");
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return err;
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}
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res_size = resource_size(&res);
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if (!request_mem_region(res.start, res_size, DRV_NAME)) {
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dev_err(&ofdev->dev, "couldn't request %pR\n", &res);
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return -EBUSY;
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}
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base = ioremap_nocache(res.start, res_size);
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if (!base) {
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dev_err(&ofdev->dev, "couldn't ioremap %pR\n", &res);
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err = -ENOMEM;
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goto exit_release_mem;
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}
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irq = irq_of_parse_and_map(np, 0);
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if (irq == 0) {
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dev_err(&ofdev->dev, "no irq found\n");
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err = -ENODEV;
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goto exit_unmap_mem;
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}
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dev = alloc_sja1000dev(0);
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if (!dev) {
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err = -ENOMEM;
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goto exit_dispose_irq;
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}
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priv = netdev_priv(dev);
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priv->read_reg = sja1000_ofp_read_reg;
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priv->write_reg = sja1000_ofp_write_reg;
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err = of_property_read_u32(np, "nxp,external-clock-frequency", &prop);
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if (!err)
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priv->can.clock.freq = prop / 2;
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else
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priv->can.clock.freq = SJA1000_OFP_CAN_CLOCK; /* default */
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err = of_property_read_u32(np, "nxp,tx-output-mode", &prop);
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if (!err)
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priv->ocr |= prop & OCR_MODE_MASK;
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else
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priv->ocr |= OCR_MODE_NORMAL; /* default */
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err = of_property_read_u32(np, "nxp,tx-output-config", &prop);
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if (!err)
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priv->ocr |= (prop << OCR_TX_SHIFT) & OCR_TX_MASK;
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else
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priv->ocr |= OCR_TX0_PULLDOWN; /* default */
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err = of_property_read_u32(np, "nxp,clock-out-frequency", &prop);
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if (!err && prop) {
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u32 divider = priv->can.clock.freq * 2 / prop;
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if (divider > 1)
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priv->cdr |= divider / 2 - 1;
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else
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priv->cdr |= CDR_CLKOUT_MASK;
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} else {
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priv->cdr |= CDR_CLK_OFF; /* default */
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}
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if (!of_property_read_bool(np, "nxp,no-comparator-bypass"))
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priv->cdr |= CDR_CBP; /* default */
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priv->irq_flags = IRQF_SHARED;
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priv->reg_base = base;
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dev->irq = irq;
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dev_info(&ofdev->dev,
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"reg_base=0x%p irq=%d clock=%d ocr=0x%02x cdr=0x%02x\n",
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priv->reg_base, dev->irq, priv->can.clock.freq,
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priv->ocr, priv->cdr);
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platform_set_drvdata(ofdev, dev);
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SET_NETDEV_DEV(dev, &ofdev->dev);
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err = register_sja1000dev(dev);
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if (err) {
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dev_err(&ofdev->dev, "registering %s failed (err=%d)\n",
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DRV_NAME, err);
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goto exit_free_sja1000;
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}
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return 0;
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exit_free_sja1000:
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free_sja1000dev(dev);
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exit_dispose_irq:
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irq_dispose_mapping(irq);
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exit_unmap_mem:
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iounmap(base);
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exit_release_mem:
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release_mem_region(res.start, res_size);
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return err;
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}
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static struct of_device_id sja1000_ofp_table[] = {
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{.compatible = "nxp,sja1000"},
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{},
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};
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MODULE_DEVICE_TABLE(of, sja1000_ofp_table);
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static struct platform_driver sja1000_ofp_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = DRV_NAME,
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.of_match_table = sja1000_ofp_table,
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},
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.probe = sja1000_ofp_probe,
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.remove = sja1000_ofp_remove,
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};
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module_platform_driver(sja1000_ofp_driver);
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@ -26,12 +26,16 @@
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#include <linux/can/dev.h>
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#include <linux/can/platform/sja1000.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include "sja1000.h"
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#define DRV_NAME "sja1000_platform"
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#define SP_CAN_CLOCK (16000000 / 2)
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MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
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MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
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MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
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MODULE_ALIAS("platform:" DRV_NAME);
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MODULE_LICENSE("GPL v2");
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@ -66,51 +70,16 @@ static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
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iowrite8(val, priv->reg_base + reg * 4);
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}
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static int sp_probe(struct platform_device *pdev)
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static void sp_populate(struct sja1000_priv *priv,
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struct sja1000_platform_data *pdata,
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unsigned long resource_mem_flags)
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{
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int err;
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void __iomem *addr;
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struct net_device *dev;
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struct sja1000_priv *priv;
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struct resource *res_mem, *res_irq;
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struct sja1000_platform_data *pdata;
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pdata = dev_get_platdata(&pdev->dev);
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if (!pdata) {
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dev_err(&pdev->dev, "No platform data provided!\n");
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return -ENODEV;
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}
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res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (!res_mem || !res_irq)
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return -ENODEV;
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if (!devm_request_mem_region(&pdev->dev, res_mem->start,
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resource_size(res_mem), DRV_NAME))
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return -EBUSY;
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addr = devm_ioremap_nocache(&pdev->dev, res_mem->start,
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resource_size(res_mem));
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if (!addr)
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return -ENOMEM;
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dev = alloc_sja1000dev(0);
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if (!dev)
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return -ENOMEM;
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priv = netdev_priv(dev);
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dev->irq = res_irq->start;
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priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
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if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
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priv->irq_flags |= IRQF_SHARED;
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priv->reg_base = addr;
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/* The CAN clock frequency is half the oscillator clock frequency */
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priv->can.clock.freq = pdata->osc_freq / 2;
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priv->ocr = pdata->ocr;
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priv->cdr = pdata->cdr;
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switch (res_mem->flags & IORESOURCE_MEM_TYPE_MASK) {
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switch (resource_mem_flags & IORESOURCE_MEM_TYPE_MASK) {
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case IORESOURCE_MEM_32BIT:
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priv->read_reg = sp_read_reg32;
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priv->write_reg = sp_write_reg32;
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@ -125,6 +94,108 @@ static int sp_probe(struct platform_device *pdev)
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priv->write_reg = sp_write_reg8;
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break;
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}
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}
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static void sp_populate_of(struct sja1000_priv *priv, struct device_node *of)
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{
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int err;
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u32 prop;
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priv->read_reg = sp_read_reg8;
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priv->write_reg = sp_write_reg8;
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err = of_property_read_u32(of, "nxp,external-clock-frequency", &prop);
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if (!err)
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priv->can.clock.freq = prop / 2;
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else
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priv->can.clock.freq = SP_CAN_CLOCK; /* default */
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err = of_property_read_u32(of, "nxp,tx-output-mode", &prop);
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if (!err)
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priv->ocr |= prop & OCR_MODE_MASK;
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else
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priv->ocr |= OCR_MODE_NORMAL; /* default */
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err = of_property_read_u32(of, "nxp,tx-output-config", &prop);
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if (!err)
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priv->ocr |= (prop << OCR_TX_SHIFT) & OCR_TX_MASK;
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else
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priv->ocr |= OCR_TX0_PULLDOWN; /* default */
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err = of_property_read_u32(of, "nxp,clock-out-frequency", &prop);
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if (!err && prop) {
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u32 divider = priv->can.clock.freq * 2 / prop;
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if (divider > 1)
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priv->cdr |= divider / 2 - 1;
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else
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priv->cdr |= CDR_CLKOUT_MASK;
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} else {
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priv->cdr |= CDR_CLK_OFF; /* default */
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}
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if (!of_property_read_bool(of, "nxp,no-comparator-bypass"))
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priv->cdr |= CDR_CBP; /* default */
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}
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static int sp_probe(struct platform_device *pdev)
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{
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int err, irq = 0;
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void __iomem *addr;
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struct net_device *dev;
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struct sja1000_priv *priv;
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struct resource *res_mem, *res_irq = NULL;
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struct sja1000_platform_data *pdata;
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struct device_node *of = pdev->dev.of_node;
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pdata = dev_get_platdata(&pdev->dev);
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if (!pdata && !of) {
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dev_err(&pdev->dev, "No platform data provided!\n");
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return -ENODEV;
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}
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res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res_mem)
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return -ENODEV;
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if (!devm_request_mem_region(&pdev->dev, res_mem->start,
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resource_size(res_mem), DRV_NAME))
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return -EBUSY;
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addr = devm_ioremap_nocache(&pdev->dev, res_mem->start,
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resource_size(res_mem));
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if (!addr)
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return -ENOMEM;
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if (of)
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irq = irq_of_parse_and_map(of, 0);
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else
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res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (!irq && !res_irq)
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return -ENODEV;
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dev = alloc_sja1000dev(0);
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if (!dev)
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return -ENOMEM;
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priv = netdev_priv(dev);
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if (res_irq) {
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irq = res_irq->start;
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priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
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if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
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priv->irq_flags |= IRQF_SHARED;
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} else {
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priv->irq_flags = IRQF_SHARED;
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}
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dev->irq = irq;
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priv->reg_base = addr;
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if (of)
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sp_populate_of(priv, of);
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else
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sp_populate(priv, pdata, res_mem->flags);
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platform_set_drvdata(pdev, dev);
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SET_NETDEV_DEV(dev, &pdev->dev);
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@ -155,12 +226,19 @@ static int sp_remove(struct platform_device *pdev)
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return 0;
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}
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static struct of_device_id sp_of_table[] = {
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{.compatible = "nxp,sja1000"},
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{},
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};
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MODULE_DEVICE_TABLE(of, sp_of_table);
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static struct platform_driver sp_driver = {
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.probe = sp_probe,
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.remove = sp_remove,
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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.of_match_table = sp_of_table,
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},
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};
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Reference in New Issue