Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Florian Vaussard | 532 | 35.63% | 3 | 20.00% |
Wolfgang Grandegger | 421 | 28.20% | 2 | 13.33% |
Damien Riegel | 385 | 25.79% | 2 | 13.33% |
Yegor Yefremov | 126 | 8.44% | 2 | 13.33% |
Sven Schmitt | 13 | 0.87% | 1 | 6.67% |
Jingoo Han | 6 | 0.40% | 2 | 13.33% |
Marc Kleine-Budde | 6 | 0.40% | 1 | 6.67% |
Axel Lin | 2 | 0.13% | 1 | 6.67% |
Thomas Gleixner | 2 | 0.13% | 1 | 6.67% |
Total | 1493 | 15 |
// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2005 Sascha Hauer, Pengutronix * Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com> */ #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_device.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"); struct sja1000_of_data { size_t priv_sz; int (*init)(struct sja1000_priv *priv, struct device_node *of); }; struct technologic_priv { spinlock_t io_lock; }; 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 u8 sp_technologic_read_reg16(const struct sja1000_priv *priv, int reg) { struct technologic_priv *tp = priv->priv; unsigned long flags; u8 val; spin_lock_irqsave(&tp->io_lock, flags); iowrite16(reg, priv->reg_base + 0); val = ioread16(priv->reg_base + 2); spin_unlock_irqrestore(&tp->io_lock, flags); return val; } static void sp_technologic_write_reg16(const struct sja1000_priv *priv, int reg, u8 val) { struct technologic_priv *tp = priv->priv; unsigned long flags; spin_lock_irqsave(&tp->io_lock, flags); iowrite16(reg, priv->reg_base + 0); iowrite16(val, priv->reg_base + 2); spin_unlock_irqrestore(&tp->io_lock, flags); } static int sp_technologic_init(struct sja1000_priv *priv, struct device_node *of) { struct technologic_priv *tp = priv->priv; priv->read_reg = sp_technologic_read_reg16; priv->write_reg = sp_technologic_write_reg16; spin_lock_init(&tp->io_lock); return 0; } 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 struct sja1000_of_data technologic_data = { .priv_sz = sizeof(struct technologic_priv), .init = sp_technologic_init, }; static const struct of_device_id sp_of_table[] = { { .compatible = "nxp,sja1000", .data = NULL, }, { .compatible = "technologic,sja1000", .data = &technologic_data, }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, sp_of_table); 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; const struct of_device_id *of_id; const struct sja1000_of_data *of_data = NULL; size_t priv_sz = 0; 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; of_id = of_match_device(sp_of_table, &pdev->dev); if (of_id && of_id->data) { of_data = of_id->data; priv_sz = of_data->priv_sz; } dev = alloc_sja1000dev(priv_sz); 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); if (of_data && of_data->init) { err = of_data->init(priv, of); if (err) goto exit_free; } } 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 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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