Commit f524f829 authored by Dan Murphy's avatar Dan Murphy Committed by Marc Kleine-Budde

can: m_can: Create a m_can platform framework

Create a m_can platform framework that peripheral
devices can register to and use common code and register sets.
The peripheral devices may provide read/write and configuration
support of the IP.
Acked-by: default avatarWolfgang Grandegger <wg@grandegger.com>
Signed-off-by: default avatarDan Murphy <dmurphy@ti.com>
Acked-by: default avatarFaiz Abbas <faiz_abbas@ti.com>
Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
parent 69652195
# SPDX-License-Identifier: GPL-2.0-only
config CAN_M_CAN
tristate "Bosch M_CAN support"
---help---
Say Y here if you want support for Bosch M_CAN controller framework.
This is common support for devices that embed the Bosch M_CAN IP.
config CAN_M_CAN_PLATFORM
tristate "Bosch M_CAN support for io-mapped devices"
depends on HAS_IOMEM
tristate "Bosch M_CAN devices"
depends on CAN_M_CAN
---help---
Say Y here if you want to support for Bosch M_CAN controller.
Say Y here if you want support for IO Mapped Bosch M_CAN controller.
This support is for devices that have the Bosch M_CAN controller
IP embedded into the device and the IP is IO Mapped to the processor.
......@@ -4,3 +4,4 @@
#
obj-$(CONFIG_CAN_M_CAN) += m_can.o
obj-$(CONFIG_CAN_M_CAN_PLATFORM) += m_can_platform.o
This diff is collapsed.
/* SPDX-License-Identifier: GPL-2.0 */
/* CAN bus driver for Bosch M_CAN controller
* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
*/
#ifndef _CAN_M_CAN_H_
#define _CAN_M_CAN_H_
#include <linux/can/core.h>
#include <linux/can/led.h>
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/freezer.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/iopoll.h>
#include <linux/can/dev.h>
#include <linux/pinctrl/consumer.h>
/* m_can lec values */
enum m_can_lec_type {
LEC_NO_ERROR = 0,
LEC_STUFF_ERROR,
LEC_FORM_ERROR,
LEC_ACK_ERROR,
LEC_BIT1_ERROR,
LEC_BIT0_ERROR,
LEC_CRC_ERROR,
LEC_UNUSED,
};
enum m_can_mram_cfg {
MRAM_SIDF = 0,
MRAM_XIDF,
MRAM_RXF0,
MRAM_RXF1,
MRAM_RXB,
MRAM_TXE,
MRAM_TXB,
MRAM_CFG_NUM,
};
/* address offset and element number for each FIFO/Buffer in the Message RAM */
struct mram_cfg {
u16 off;
u8 num;
};
struct m_can_priv;
struct m_can_ops {
/* Device specific call backs */
int (*clear_interrupts)(struct m_can_priv *m_can_class);
u32 (*read_reg)(struct m_can_priv *m_can_class, int reg);
int (*write_reg)(struct m_can_priv *m_can_class, int reg, int val);
u32 (*read_fifo)(struct m_can_priv *m_can_class, int addr_offset);
int (*write_fifo)(struct m_can_priv *m_can_class, int addr_offset,
int val);
int (*init)(struct m_can_priv *m_can_class);
};
struct m_can_priv {
struct can_priv can;
struct napi_struct napi;
struct net_device *net;
struct device *dev;
struct clk *hclk;
struct clk *cclk;
struct workqueue_struct *tx_wq;
struct work_struct tx_work;
struct sk_buff *tx_skb;
struct can_bittiming_const *bit_timing;
struct can_bittiming_const *data_timing;
struct m_can_ops *ops;
void *device_data;
int version;
int freq;
u32 irqstatus;
int pm_clock_support;
int is_peripheral;
struct mram_cfg mcfg[MRAM_CFG_NUM];
};
struct m_can_priv *m_can_class_allocate_dev(struct device *dev);
int m_can_class_register(struct m_can_priv *m_can_dev);
void m_can_class_unregister(struct m_can_priv *m_can_dev);
int m_can_class_get_clocks(struct m_can_priv *m_can_dev);
void m_can_init_ram(struct m_can_priv *priv);
void m_can_config_endisable(struct m_can_priv *priv, bool enable);
int m_can_class_suspend(struct device *dev);
int m_can_class_resume(struct device *dev);
#endif /* _CAN_M_H_ */
// 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_priv *cdev, int reg)
{
struct m_can_plat_priv *priv =
(struct m_can_plat_priv *)cdev->device_data;
return readl(priv->base + reg);
}
static u32 iomap_read_fifo(struct m_can_priv *cdev, int offset)
{
struct m_can_plat_priv *priv =
(struct m_can_plat_priv *)cdev->device_data;
return readl(priv->mram_base + offset);
}
static int iomap_write_reg(struct m_can_priv *cdev, int reg, int val)
{
struct m_can_plat_priv *priv =
(struct m_can_plat_priv *)cdev->device_data;
writel(val, priv->base + reg);
return 0;
}
static int iomap_write_fifo(struct m_can_priv *cdev, int offset, int val)
{
struct m_can_plat_priv *priv =
(struct m_can_plat_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_priv *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);
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
mcan_class->device_data = priv;
m_can_class_get_clocks(mcan_class);
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 failed_ret;
}
/* message ram could be shared */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram");
if (!res) {
ret = -ENODEV;
goto failed_ret;
}
mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!mram_addr) {
ret = -ENOMEM;
goto failed_ret;
}
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->dev);
m_can_init_ram(mcan_class);
ret = m_can_class_register(mcan_class);
failed_ret:
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_priv *mcan_class = netdev_priv(dev);
m_can_class_unregister(mcan_class);
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_priv *mcan_class = netdev_priv(ndev);
m_can_class_suspend(dev);
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_priv *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);
m_can_class_resume(dev);
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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