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// 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 "m_can.h"
struct m_can_plat_priv {
void __iomem *base;
void __iomem *mram_base;
};
static u32 iomap_read_reg(struct m_can_classdev *cdev, int reg)
{
struct m_can_plat_priv *priv = cdev->device_data;
return readl(priv->base + reg);
}
static u32 iomap_read_fifo(struct m_can_classdev *cdev, int offset)
{
struct m_can_plat_priv *priv = cdev->device_data;
return readl(priv->mram_base + offset);
}
static int iomap_write_reg(struct m_can_classdev *cdev, int reg, int val)
{
struct m_can_plat_priv *priv = cdev->device_data;
writel(val, priv->base + reg);
return 0;
}
static int iomap_write_fifo(struct m_can_classdev *cdev, int offset, int val)
{
struct m_can_plat_priv *priv = cdev->device_data;
writel(val, priv->mram_base + offset);
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;
int irq, ret = 0;
mcan_class = m_can_class_allocate_dev(&pdev->dev);
if (!mcan_class)
return -ENOMEM;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv) {
ret = -ENOMEM;
goto probe_fail;
}
mcan_class->device_data = priv;
ret = m_can_class_get_clocks(mcan_class);
if (ret)
goto probe_fail;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can");
addr = devm_ioremap_resource(&pdev->dev, res);
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;
}
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->ops = &m_can_plat_ops;
mcan_class->is_peripheral = false;
platform_set_drvdata(pdev, mcan_class->net);
m_can_init_ram(mcan_class);
return m_can_class_register(mcan_class);
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 net_device *dev = platform_get_drvdata(pdev);
struct m_can_classdev *mcan_class = netdev_priv(dev);
m_can_class_unregister(mcan_class);
m_can_class_free_dev(mcan_class->net);
platform_set_drvdata(pdev, NULL);
return 0;
}
static int __maybe_unused m_can_runtime_suspend(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
struct m_can_classdev *mcan_class = netdev_priv(ndev);
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 net_device *ndev = dev_get_drvdata(dev);
struct m_can_classdev *mcan_class = netdev_priv(ndev);
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");
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