1 // SPDX-License-Identifier: GPL-2.0
2 // IOMapped CAN bus driver for Bosch M_CAN controller
3 // Copyright (C) 2014 Freescale Semiconductor, Inc.
4 // Dong Aisheng <b29396@freescale.com>
6 // Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
8 #include <linux/platform_device.h>
12 struct m_can_plat_priv {
14 void __iomem *mram_base;
17 static u32 iomap_read_reg(struct m_can_classdev *cdev, int reg)
19 struct m_can_plat_priv *priv = cdev->device_data;
21 return readl(priv->base + reg);
24 static u32 iomap_read_fifo(struct m_can_classdev *cdev, int offset)
26 struct m_can_plat_priv *priv = cdev->device_data;
28 return readl(priv->mram_base + offset);
31 static int iomap_write_reg(struct m_can_classdev *cdev, int reg, int val)
33 struct m_can_plat_priv *priv = cdev->device_data;
35 writel(val, priv->base + reg);
40 static int iomap_write_fifo(struct m_can_classdev *cdev, int offset, int val)
42 struct m_can_plat_priv *priv = cdev->device_data;
44 writel(val, priv->mram_base + offset);
49 static struct m_can_ops m_can_plat_ops = {
50 .read_reg = iomap_read_reg,
51 .write_reg = iomap_write_reg,
52 .write_fifo = iomap_write_fifo,
53 .read_fifo = iomap_read_fifo,
56 static int m_can_plat_probe(struct platform_device *pdev)
58 struct m_can_classdev *mcan_class;
59 struct m_can_plat_priv *priv;
62 void __iomem *mram_addr;
65 mcan_class = m_can_class_allocate_dev(&pdev->dev);
69 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
73 mcan_class->device_data = priv;
75 m_can_class_get_clocks(mcan_class);
77 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can");
78 addr = devm_ioremap_resource(&pdev->dev, res);
79 irq = platform_get_irq_byname(pdev, "int0");
80 if (IS_ERR(addr) || irq < 0) {
85 /* message ram could be shared */
86 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram");
92 mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
99 priv->mram_base = mram_addr;
101 mcan_class->net->irq = irq;
102 mcan_class->pm_clock_support = 1;
103 mcan_class->can.clock.freq = clk_get_rate(mcan_class->cclk);
104 mcan_class->dev = &pdev->dev;
106 mcan_class->ops = &m_can_plat_ops;
108 mcan_class->is_peripheral = false;
110 platform_set_drvdata(pdev, mcan_class->dev);
112 m_can_init_ram(mcan_class);
114 ret = m_can_class_register(mcan_class);
120 static __maybe_unused int m_can_suspend(struct device *dev)
122 return m_can_class_suspend(dev);
125 static __maybe_unused int m_can_resume(struct device *dev)
127 return m_can_class_resume(dev);
130 static int m_can_plat_remove(struct platform_device *pdev)
132 struct net_device *dev = platform_get_drvdata(pdev);
133 struct m_can_classdev *mcan_class = netdev_priv(dev);
135 m_can_class_unregister(mcan_class);
137 platform_set_drvdata(pdev, NULL);
142 static int __maybe_unused m_can_runtime_suspend(struct device *dev)
144 struct net_device *ndev = dev_get_drvdata(dev);
145 struct m_can_classdev *mcan_class = netdev_priv(ndev);
147 m_can_class_suspend(dev);
149 clk_disable_unprepare(mcan_class->cclk);
150 clk_disable_unprepare(mcan_class->hclk);
155 static int __maybe_unused m_can_runtime_resume(struct device *dev)
157 struct net_device *ndev = dev_get_drvdata(dev);
158 struct m_can_classdev *mcan_class = netdev_priv(ndev);
161 err = clk_prepare_enable(mcan_class->hclk);
165 err = clk_prepare_enable(mcan_class->cclk);
167 clk_disable_unprepare(mcan_class->hclk);
169 m_can_class_resume(dev);
174 static const struct dev_pm_ops m_can_pmops = {
175 SET_RUNTIME_PM_OPS(m_can_runtime_suspend,
176 m_can_runtime_resume, NULL)
177 SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume)
180 static const struct of_device_id m_can_of_table[] = {
181 { .compatible = "bosch,m_can", .data = NULL },
184 MODULE_DEVICE_TABLE(of, m_can_of_table);
186 static struct platform_driver m_can_plat_driver = {
188 .name = KBUILD_MODNAME,
189 .of_match_table = m_can_of_table,
192 .probe = m_can_plat_probe,
193 .remove = m_can_plat_remove,
196 module_platform_driver(m_can_plat_driver);
198 MODULE_AUTHOR("Dong Aisheng <b29396@freescale.com>");
199 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
200 MODULE_LICENSE("GPL v2");
201 MODULE_DESCRIPTION("M_CAN driver for IO Mapped Bosch controllers");