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/*
* drivers/can/h7202_can.c
*
* Copyright (C) 2007
*
* - Sascha Hauer, Marc Kleine-Budde, Pengutronix
* - Simon Kallweit, intefo AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the version 2 of the GNU General Public License
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/netdevice.h>
#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/io.h>
#include <asm/hardware.h>
#include "ccan.h"
#define DRV_NAME "h7202can"
#define DELAY 5
#define CAN_ENABLE 0x0e
static u16 h7202can_read_reg(struct net_device *dev, enum c_regs reg)
{
u16 val;
volatile int i;
/* The big kernel lock is used to prevent any other AMBA devices from
* interfering with the current register read operation. The register
* is read twice because of braindamaged hynix cpu.
*/
lock_kernel();
val = inw(dev->base_addr + (reg<<1));
for (i = 0; i < DELAY; i++);
val = inw(dev->base_addr + (reg<<1));
for (i = 0; i < DELAY; i++);
unlock_kernel();
return val;
}
static void h7202can_write_reg(struct net_device *dev, enum c_regs reg, u16 val)
{
volatile int i;
lock_kernel();
outw(val, dev->base_addr + (reg<<1));
for (i = 0; i < DELAY; i++);
unlock_kernel();
}
static int h7202can_drv_probe(struct platform_device *pdev)
{
struct net_device *dev;
struct ccan_priv *priv;
struct resource *mem;
u32 mem_size;
int ret = -ENODEV;
dev = alloc_ccandev(sizeof(struct ccan_priv));
if (!dev)
return -ENOMEM;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
dev->irq = platform_get_irq(pdev, 0);
if (!mem || !dev->irq)
goto req_error;
mem_size = mem->end - mem->start + 1;
if (!request_mem_region(mem->start, mem_size, pdev->dev.driver->name)) {
dev_err(&pdev->dev, "resource unavailable\n");
goto req_error;
}
SET_NETDEV_DEV(dev, &pdev->dev);
dev->base_addr = (unsigned long)ioremap_nocache(mem->start, mem_size);
if (!dev->base_addr) {
dev_err(&pdev->dev, "failed to map can port\n");
ret = -ENOMEM;
goto fail_map;
}
priv = netdev_priv(dev);
priv->can.can_sys_clock = 8000000;
priv->read_reg = h7202can_read_reg;
priv->write_reg = h7202can_write_reg;
platform_set_drvdata(pdev, dev);
/* configure ports */
switch (mem->start) {
case CAN0_PHYS:
CPU_REG(GPIO_C_VIRT, GPIO_EN) &= ~(3<<1);
CPU_REG(GPIO_C_VIRT, GPIO_DIR) &= ~(1<<1);
CPU_REG(GPIO_C_VIRT, GPIO_DIR) |= (1<<2);
break;
case CAN1_PHYS:
CPU_REG(GPIO_E_VIRT, GPIO_EN) &= ~(3<<16);
CPU_REG(GPIO_E_VIRT, GPIO_DIR) |= (1<<16);
CPU_REG(GPIO_E_VIRT, GPIO_DIR) &= ~(1<<17);
break;
}
/* enable can */
h7202can_write_reg(dev, CAN_ENABLE, 1);
ret = register_ccandev(dev);
if (ret >= 0) {
dev_info(&pdev->dev, "probe for a port 0x%lX done\n",
dev->base_addr);
return ret;
}
iounmap((unsigned long *)dev->base_addr);
fail_map:
release_mem_region(mem->start, mem_size);
req_error:
free_ccandev(dev);
dev_err(&pdev->dev, "probe failed\n");
return ret;
}
static int h7202can_drv_remove(struct platform_device *pdev)
{
struct net_device *dev = platform_get_drvdata(pdev);
struct resource *mem;
platform_set_drvdata(pdev, NULL);
unregister_ccandev(dev);
iounmap((volatile void __iomem *)(dev->base_addr));
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(mem->start, mem->end - mem->start + 1);
free_ccandev(dev);
return 0;
}
#ifdef CONFIG_PM
static int h7202can_drv_suspend(struct platform_device *pdev,
pm_message_t state)
{
return 0;
}
static int h7202can_drv_resume(struct platform_device *pdev)
{
return 0;
}
#endif /* CONFIG_PM */
static struct platform_driver h7202can_driver = {
.driver = {
.name = DRV_NAME,
},
.probe = h7202can_drv_probe,
.remove = h7202can_drv_remove,
#ifdef CONFIG_PM
.suspend = h7202can_drv_suspend,
.resume = h7202can_drv_resume,
#endif /* CONFIG_PM */
};
static int __init h7202can_init(void)
{
printk(KERN_INFO "%s initializing\n", h7202can_driver.driver.name);
return platform_driver_register(&h7202can_driver);
}
static void __exit h7202can_cleanup(void)
{
platform_driver_unregister(&h7202can_driver);
printk(KERN_INFO "%s unloaded\n", h7202can_driver.driver.name);
}
module_init(h7202can_init);
module_exit(h7202can_cleanup);
MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
MODULE_AUTHOR("Simon Kallweit <simon.kallweit@intefo.ch>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CAN port driver Hynix H7202 processor");
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