| // SPDX-License-Identifier: GPL-2.0 |
| // IOMapped CAN bus driver for Bosch M_CAN controller |
| // Copyright (C) 2014 Freescale Semiconductor, Inc. |
| // Dong Aisheng <b29396@freescale.com> |
| // |
| // Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/ |
| |
| #include <linux/platform_device.h> |
| #include <linux/phy/phy.h> |
| |
| #include "m_can.h" |
| |
| struct m_can_plat_priv { |
| struct m_can_classdev cdev; |
| |
| void __iomem *base; |
| void __iomem *mram_base; |
| }; |
| |
| static inline struct m_can_plat_priv *cdev_to_priv(struct m_can_classdev *cdev) |
| { |
| return container_of(cdev, struct m_can_plat_priv, cdev); |
| } |
| |
| static u32 iomap_read_reg(struct m_can_classdev *cdev, int reg) |
| { |
| struct m_can_plat_priv *priv = cdev_to_priv(cdev); |
| |
| return readl(priv->base + reg); |
| } |
| |
| static int iomap_read_fifo(struct m_can_classdev *cdev, int offset, void *val, size_t val_count) |
| { |
| struct m_can_plat_priv *priv = cdev_to_priv(cdev); |
| void __iomem *src = priv->mram_base + offset; |
| |
| while (val_count--) { |
| *(unsigned int *)val = ioread32(src); |
| val += 4; |
| src += 4; |
| } |
| |
| return 0; |
| } |
| |
| static int iomap_write_reg(struct m_can_classdev *cdev, int reg, int val) |
| { |
| struct m_can_plat_priv *priv = cdev_to_priv(cdev); |
| |
| writel(val, priv->base + reg); |
| |
| return 0; |
| } |
| |
| static int iomap_write_fifo(struct m_can_classdev *cdev, int offset, |
| const void *val, size_t val_count) |
| { |
| struct m_can_plat_priv *priv = cdev_to_priv(cdev); |
| void __iomem *dst = priv->mram_base + offset; |
| |
| while (val_count--) { |
| iowrite32(*(unsigned int *)val, dst); |
| val += 4; |
| dst += 4; |
| } |
| |
| return 0; |
| } |
| |
| static struct m_can_ops m_can_plat_ops = { |
| .read_reg = iomap_read_reg, |
| .write_reg = iomap_write_reg, |
| .write_fifo = iomap_write_fifo, |
| .read_fifo = iomap_read_fifo, |
| }; |
| |
| static int m_can_plat_probe(struct platform_device *pdev) |
| { |
| struct m_can_classdev *mcan_class; |
| struct m_can_plat_priv *priv; |
| struct resource *res; |
| void __iomem *addr; |
| void __iomem *mram_addr; |
| struct phy *transceiver; |
| int irq, ret = 0; |
| |
| mcan_class = m_can_class_allocate_dev(&pdev->dev, |
| sizeof(struct m_can_plat_priv)); |
| if (!mcan_class) |
| return -ENOMEM; |
| |
| priv = cdev_to_priv(mcan_class); |
| |
| ret = m_can_class_get_clocks(mcan_class); |
| if (ret) |
| goto probe_fail; |
| |
| addr = devm_platform_ioremap_resource_byname(pdev, "m_can"); |
| irq = platform_get_irq_byname(pdev, "int0"); |
| if (IS_ERR(addr) || irq < 0) { |
| ret = -EINVAL; |
| goto probe_fail; |
| } |
| |
| /* message ram could be shared */ |
| res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram"); |
| if (!res) { |
| ret = -ENODEV; |
| goto probe_fail; |
| } |
| |
| mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res)); |
| if (!mram_addr) { |
| ret = -ENOMEM; |
| goto probe_fail; |
| } |
| |
| transceiver = devm_phy_optional_get(&pdev->dev, NULL); |
| if (IS_ERR(transceiver)) { |
| ret = PTR_ERR(transceiver); |
| dev_err_probe(&pdev->dev, ret, "failed to get phy\n"); |
| goto probe_fail; |
| } |
| |
| if (transceiver) |
| mcan_class->can.bitrate_max = transceiver->attrs.max_link_rate; |
| |
| priv->base = addr; |
| priv->mram_base = mram_addr; |
| |
| mcan_class->net->irq = irq; |
| mcan_class->pm_clock_support = 1; |
| mcan_class->can.clock.freq = clk_get_rate(mcan_class->cclk); |
| mcan_class->dev = &pdev->dev; |
| mcan_class->transceiver = transceiver; |
| |
| mcan_class->ops = &m_can_plat_ops; |
| |
| mcan_class->is_peripheral = false; |
| |
| platform_set_drvdata(pdev, mcan_class); |
| |
| ret = m_can_init_ram(mcan_class); |
| if (ret) |
| goto probe_fail; |
| |
| pm_runtime_enable(mcan_class->dev); |
| ret = m_can_class_register(mcan_class); |
| if (ret) |
| goto out_runtime_disable; |
| |
| return ret; |
| |
| out_runtime_disable: |
| pm_runtime_disable(mcan_class->dev); |
| probe_fail: |
| m_can_class_free_dev(mcan_class->net); |
| return ret; |
| } |
| |
| static __maybe_unused int m_can_suspend(struct device *dev) |
| { |
| return m_can_class_suspend(dev); |
| } |
| |
| static __maybe_unused int m_can_resume(struct device *dev) |
| { |
| return m_can_class_resume(dev); |
| } |
| |
| static int m_can_plat_remove(struct platform_device *pdev) |
| { |
| struct m_can_plat_priv *priv = platform_get_drvdata(pdev); |
| struct m_can_classdev *mcan_class = &priv->cdev; |
| |
| m_can_class_unregister(mcan_class); |
| |
| m_can_class_free_dev(mcan_class->net); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused m_can_runtime_suspend(struct device *dev) |
| { |
| struct m_can_plat_priv *priv = dev_get_drvdata(dev); |
| struct m_can_classdev *mcan_class = &priv->cdev; |
| |
| clk_disable_unprepare(mcan_class->cclk); |
| clk_disable_unprepare(mcan_class->hclk); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused m_can_runtime_resume(struct device *dev) |
| { |
| struct m_can_plat_priv *priv = dev_get_drvdata(dev); |
| struct m_can_classdev *mcan_class = &priv->cdev; |
| int err; |
| |
| err = clk_prepare_enable(mcan_class->hclk); |
| if (err) |
| return err; |
| |
| err = clk_prepare_enable(mcan_class->cclk); |
| if (err) |
| clk_disable_unprepare(mcan_class->hclk); |
| |
| return err; |
| } |
| |
| static const struct dev_pm_ops m_can_pmops = { |
| SET_RUNTIME_PM_OPS(m_can_runtime_suspend, |
| m_can_runtime_resume, NULL) |
| SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume) |
| }; |
| |
| static const struct of_device_id m_can_of_table[] = { |
| { .compatible = "bosch,m_can", .data = NULL }, |
| { /* sentinel */ }, |
| }; |
| MODULE_DEVICE_TABLE(of, m_can_of_table); |
| |
| static struct platform_driver m_can_plat_driver = { |
| .driver = { |
| .name = KBUILD_MODNAME, |
| .of_match_table = m_can_of_table, |
| .pm = &m_can_pmops, |
| }, |
| .probe = m_can_plat_probe, |
| .remove = m_can_plat_remove, |
| }; |
| |
| module_platform_driver(m_can_plat_driver); |
| |
| MODULE_AUTHOR("Dong Aisheng <b29396@freescale.com>"); |
| MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_DESCRIPTION("M_CAN driver for IO Mapped Bosch controllers"); |