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318 lines
7.4 KiB
318 lines
7.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2005 Sascha Hauer, Pengutronix |
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* Copyright (C) 2007 Wolfgang Grandegger <[email protected]> |
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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/pci.h> |
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#include <linux/platform_device.h> |
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#include <linux/irq.h> |
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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_device.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 <[email protected]>"); |
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MODULE_AUTHOR("Wolfgang Grandegger <[email protected]>"); |
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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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struct sja1000_of_data { |
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size_t priv_sz; |
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int (*init)(struct sja1000_priv *priv, struct device_node *of); |
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}; |
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struct technologic_priv { |
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spinlock_t io_lock; |
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}; |
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static u8 sp_read_reg8(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 sp_write_reg8(const struct sja1000_priv *priv, 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 u8 sp_read_reg16(const struct sja1000_priv *priv, int reg) |
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{ |
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return ioread8(priv->reg_base + reg * 2); |
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} |
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static void sp_write_reg16(const struct sja1000_priv *priv, int reg, u8 val) |
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{ |
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iowrite8(val, priv->reg_base + reg * 2); |
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} |
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static u8 sp_read_reg32(const struct sja1000_priv *priv, int reg) |
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{ |
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return ioread8(priv->reg_base + reg * 4); |
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} |
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static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val) |
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{ |
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iowrite8(val, priv->reg_base + reg * 4); |
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} |
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static u8 sp_technologic_read_reg16(const struct sja1000_priv *priv, int reg) |
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{ |
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struct technologic_priv *tp = priv->priv; |
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unsigned long flags; |
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u8 val; |
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spin_lock_irqsave(&tp->io_lock, flags); |
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iowrite16(reg, priv->reg_base + 0); |
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val = ioread16(priv->reg_base + 2); |
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spin_unlock_irqrestore(&tp->io_lock, flags); |
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return val; |
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} |
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static void sp_technologic_write_reg16(const struct sja1000_priv *priv, |
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int reg, u8 val) |
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{ |
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struct technologic_priv *tp = priv->priv; |
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unsigned long flags; |
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spin_lock_irqsave(&tp->io_lock, flags); |
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iowrite16(reg, priv->reg_base + 0); |
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iowrite16(val, priv->reg_base + 2); |
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spin_unlock_irqrestore(&tp->io_lock, flags); |
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} |
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static int sp_technologic_init(struct sja1000_priv *priv, struct device_node *of) |
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{ |
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struct technologic_priv *tp = priv->priv; |
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priv->read_reg = sp_technologic_read_reg16; |
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priv->write_reg = sp_technologic_write_reg16; |
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spin_lock_init(&tp->io_lock); |
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return 0; |
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} |
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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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/* 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 (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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break; |
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case IORESOURCE_MEM_16BIT: |
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priv->read_reg = sp_read_reg16; |
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priv->write_reg = sp_write_reg16; |
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break; |
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case IORESOURCE_MEM_8BIT: |
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default: |
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priv->read_reg = sp_read_reg8; |
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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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err = of_property_read_u32(of, "reg-io-width", &prop); |
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if (err) |
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prop = 1; /* 8 bit is default */ |
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switch (prop) { |
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case 4: |
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priv->read_reg = sp_read_reg32; |
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priv->write_reg = sp_write_reg32; |
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break; |
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case 2: |
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priv->read_reg = sp_read_reg16; |
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priv->write_reg = sp_write_reg16; |
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break; |
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case 1: |
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default: |
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priv->read_reg = sp_read_reg8; |
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priv->write_reg = sp_write_reg8; |
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} |
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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 struct sja1000_of_data technologic_data = { |
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.priv_sz = sizeof(struct technologic_priv), |
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.init = sp_technologic_init, |
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}; |
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static const struct of_device_id sp_of_table[] = { |
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{ .compatible = "nxp,sja1000", .data = NULL, }, |
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{ .compatible = "technologic,sja1000", .data = &technologic_data, }, |
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{ /* sentinel */ }, |
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}; |
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MODULE_DEVICE_TABLE(of, sp_of_table); |
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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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const struct of_device_id *of_id; |
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const struct sja1000_of_data *of_data = NULL; |
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size_t priv_sz = 0; |
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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(&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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of_id = of_match_device(sp_of_table, &pdev->dev); |
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if (of_id && of_id->data) { |
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of_data = of_id->data; |
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priv_sz = of_data->priv_sz; |
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} |
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dev = alloc_sja1000dev(priv_sz); |
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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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if (of_data && of_data->init) { |
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err = of_data->init(priv, of); |
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if (err) |
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goto exit_free; |
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} |
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} else { |
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sp_populate(priv, pdata, res_mem->flags); |
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} |
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platform_set_drvdata(pdev, dev); |
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SET_NETDEV_DEV(dev, &pdev->dev); |
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err = register_sja1000dev(dev); |
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if (err) { |
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dev_err(&pdev->dev, "registering %s failed (err=%d)\n", |
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DRV_NAME, err); |
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goto exit_free; |
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} |
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dev_info(&pdev->dev, "%s device registered (reg_base=%p, irq=%d)\n", |
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DRV_NAME, priv->reg_base, dev->irq); |
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return 0; |
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exit_free: |
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free_sja1000dev(dev); |
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return err; |
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} |
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static int sp_remove(struct platform_device *pdev) |
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{ |
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struct net_device *dev = platform_get_drvdata(pdev); |
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unregister_sja1000dev(dev); |
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free_sja1000dev(dev); |
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return 0; |
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} |
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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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.of_match_table = sp_of_table, |
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}, |
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}; |
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module_platform_driver(sp_driver);
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