blob: cdb28d6a092c6d043dd4af65459943abc6bc473c [file] [log] [blame]
// 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/hrtimer.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.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 = 0, 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");
if (IS_ERR(addr)) {
ret = PTR_ERR(addr);
goto probe_fail;
}
if (device_property_present(mcan_class->dev, "interrupts") ||
device_property_present(mcan_class->dev, "interrupt-names")) {
irq = platform_get_irq_byname(pdev, "int0");
if (irq < 0) {
ret = irq;
goto probe_fail;
}
} else {
dev_dbg(mcan_class->dev, "Polling enabled, initialize hrtimer");
hrtimer_init(&mcan_class->hrtimer, CLOCK_MONOTONIC,
HRTIMER_MODE_REL_PINNED);
}
/* 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);
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 void 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);
}
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_new = 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");