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- /*
- * Copyright (C) 2005 Sascha Hauer, Pengutronix
- * Copyright (C) 2007 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, see <http://www.gnu.org/licenses/>.
- */
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/interrupt.h>
- #include <linux/netdevice.h>
- #include <linux/delay.h>
- #include <linux/pci.h>
- #include <linux/platform_device.h>
- #include <linux/irq.h>
- #include <linux/can/dev.h>
- #include <linux/can/platform/sja1000.h>
- #include <linux/io.h>
- #include <linux/of.h>
- #include <linux/of_irq.h>
- #include "sja1000.h"
- #define DRV_NAME "sja1000_platform"
- #define SP_CAN_CLOCK (16000000 / 2)
- MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
- MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
- MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the platform bus");
- MODULE_ALIAS("platform:" DRV_NAME);
- MODULE_LICENSE("GPL v2");
- static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)
- {
- return ioread8(priv->reg_base + reg);
- }
- static void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)
- {
- iowrite8(val, priv->reg_base + reg);
- }
- static u8 sp_read_reg16(const struct sja1000_priv *priv, int reg)
- {
- return ioread8(priv->reg_base + reg * 2);
- }
- static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val)
- {
- iowrite8(val, priv->reg_base + reg * 2);
- }
- static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg)
- {
- return ioread8(priv->reg_base + reg * 4);
- }
- static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val)
- {
- iowrite8(val, priv->reg_base + reg * 4);
- }
- static void sp_populate(struct sja1000_priv *priv,
- struct sja1000_platform_data *pdata,
- unsigned long resource_mem_flags)
- {
- /* The CAN clock frequency is half the oscillator clock frequency */
- priv->can.clock.freq = pdata->osc_freq / 2;
- priv->ocr = pdata->ocr;
- priv->cdr = pdata->cdr;
- switch (resource_mem_flags & IORESOURCE_MEM_TYPE_MASK) {
- case IORESOURCE_MEM_32BIT:
- priv->read_reg = sp_read_reg32;
- priv->write_reg = sp_write_reg32;
- break;
- case IORESOURCE_MEM_16BIT:
- priv->read_reg = sp_read_reg16;
- priv->write_reg = sp_write_reg16;
- break;
- case IORESOURCE_MEM_8BIT:
- default:
- priv->read_reg = sp_read_reg8;
- priv->write_reg = sp_write_reg8;
- break;
- }
- }
- static void sp_populate_of(struct sja1000_priv *priv, struct device_node *of)
- {
- int err;
- u32 prop;
- err = of_property_read_u32(of, "reg-io-width", &prop);
- if (err)
- prop = 1; /* 8 bit is default */
- switch (prop) {
- case 4:
- priv->read_reg = sp_read_reg32;
- priv->write_reg = sp_write_reg32;
- break;
- case 2:
- priv->read_reg = sp_read_reg16;
- priv->write_reg = sp_write_reg16;
- break;
- case 1: /* fallthrough */
- default:
- priv->read_reg = sp_read_reg8;
- priv->write_reg = sp_write_reg8;
- }
- err = of_property_read_u32(of, "nxp,external-clock-frequency", &prop);
- if (!err)
- priv->can.clock.freq = prop / 2;
- else
- priv->can.clock.freq = SP_CAN_CLOCK; /* default */
- err = of_property_read_u32(of, "nxp,tx-output-mode", &prop);
- if (!err)
- priv->ocr |= prop & OCR_MODE_MASK;
- else
- priv->ocr |= OCR_MODE_NORMAL; /* default */
- err = of_property_read_u32(of, "nxp,tx-output-config", &prop);
- if (!err)
- priv->ocr |= (prop << OCR_TX_SHIFT) & OCR_TX_MASK;
- else
- priv->ocr |= OCR_TX0_PULLDOWN; /* default */
- err = of_property_read_u32(of, "nxp,clock-out-frequency", &prop);
- if (!err && 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 */
- }
- if (!of_property_read_bool(of, "nxp,no-comparator-bypass"))
- priv->cdr |= CDR_CBP; /* default */
- }
- static int sp_probe(struct platform_device *pdev)
- {
- int err, irq = 0;
- void __iomem *addr;
- struct net_device *dev;
- struct sja1000_priv *priv;
- struct resource *res_mem, *res_irq = NULL;
- struct sja1000_platform_data *pdata;
- struct device_node *of = pdev->dev.of_node;
- pdata = dev_get_platdata(&pdev->dev);
- if (!pdata && !of) {
- dev_err(&pdev->dev, "No platform data provided!\n");
- return -ENODEV;
- }
- res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res_mem)
- return -ENODEV;
- if (!devm_request_mem_region(&pdev->dev, res_mem->start,
- resource_size(res_mem), DRV_NAME))
- return -EBUSY;
- addr = devm_ioremap_nocache(&pdev->dev, res_mem->start,
- resource_size(res_mem));
- if (!addr)
- return -ENOMEM;
- if (of)
- irq = irq_of_parse_and_map(of, 0);
- else
- res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
- if (!irq && !res_irq)
- return -ENODEV;
- dev = alloc_sja1000dev(0);
- if (!dev)
- return -ENOMEM;
- priv = netdev_priv(dev);
- if (res_irq) {
- irq = res_irq->start;
- priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
- if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
- priv->irq_flags |= IRQF_SHARED;
- } else {
- priv->irq_flags = IRQF_SHARED;
- }
- dev->irq = irq;
- priv->reg_base = addr;
- if (of)
- sp_populate_of(priv, of);
- else
- sp_populate(priv, pdata, res_mem->flags);
- platform_set_drvdata(pdev, dev);
- SET_NETDEV_DEV(dev, &pdev->dev);
- err = register_sja1000dev(dev);
- if (err) {
- dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
- DRV_NAME, err);
- goto exit_free;
- }
- dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n",
- DRV_NAME, priv->reg_base, dev->irq);
- return 0;
- exit_free:
- free_sja1000dev(dev);
- return err;
- }
- static int sp_remove(struct platform_device *pdev)
- {
- struct net_device *dev = platform_get_drvdata(pdev);
- unregister_sja1000dev(dev);
- free_sja1000dev(dev);
- return 0;
- }
- static const struct of_device_id sp_of_table[] = {
- {.compatible = "nxp,sja1000"},
- {},
- };
- MODULE_DEVICE_TABLE(of, sp_of_table);
- static struct platform_driver sp_driver = {
- .probe = sp_probe,
- .remove = sp_remove,
- .driver = {
- .name = DRV_NAME,
- .of_match_table = sp_of_table,
- },
- };
- module_platform_driver(sp_driver);
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