mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 10:05:18 +07:00
aaa7cb268c
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 10 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.259525894@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
266 lines
6.7 KiB
C
266 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Driver for CC770 and AN82527 CAN controllers on the platform bus
|
|
*
|
|
* Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>
|
|
*/
|
|
|
|
/*
|
|
* If platform data are used you should have similar definitions
|
|
* in your board-specific code:
|
|
*
|
|
* static struct cc770_platform_data myboard_cc770_pdata = {
|
|
* .osc_freq = 16000000,
|
|
* .cir = 0x41,
|
|
* .cor = 0x20,
|
|
* .bcr = 0x40,
|
|
* };
|
|
*
|
|
* Please see include/linux/can/platform/cc770.h for description of
|
|
* above fields.
|
|
*
|
|
* If the device tree is used, you need a CAN node definition in your
|
|
* DTS file similar to:
|
|
*
|
|
* can@3,100 {
|
|
* compatible = "bosch,cc770";
|
|
* reg = <3 0x100 0x80>;
|
|
* interrupts = <2 0>;
|
|
* interrupt-parent = <&mpic>;
|
|
* bosch,external-clock-frequency = <16000000>;
|
|
* };
|
|
*
|
|
* See "Documentation/devicetree/bindings/net/can/cc770.txt" for further
|
|
* information.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/of.h>
|
|
#include <linux/can.h>
|
|
#include <linux/can/dev.h>
|
|
#include <linux/can/platform/cc770.h>
|
|
|
|
#include "cc770.h"
|
|
|
|
#define DRV_NAME "cc770_platform"
|
|
|
|
MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
|
|
MODULE_DESCRIPTION("Socket-CAN driver for CC770 on the platform bus");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:" DRV_NAME);
|
|
|
|
#define CC770_PLATFORM_CAN_CLOCK 16000000
|
|
|
|
static u8 cc770_platform_read_reg(const struct cc770_priv *priv, int reg)
|
|
{
|
|
return ioread8(priv->reg_base + reg);
|
|
}
|
|
|
|
static void cc770_platform_write_reg(const struct cc770_priv *priv, int reg,
|
|
u8 val)
|
|
{
|
|
iowrite8(val, priv->reg_base + reg);
|
|
}
|
|
|
|
static int cc770_get_of_node_data(struct platform_device *pdev,
|
|
struct cc770_priv *priv)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
const u32 *prop;
|
|
int prop_size;
|
|
u32 clkext;
|
|
|
|
prop = of_get_property(np, "bosch,external-clock-frequency",
|
|
&prop_size);
|
|
if (prop && (prop_size == sizeof(u32)))
|
|
clkext = *prop;
|
|
else
|
|
clkext = CC770_PLATFORM_CAN_CLOCK; /* default */
|
|
priv->can.clock.freq = clkext;
|
|
|
|
/* The system clock may not exceed 10 MHz */
|
|
if (priv->can.clock.freq > 10000000) {
|
|
priv->cpu_interface |= CPUIF_DSC;
|
|
priv->can.clock.freq /= 2;
|
|
}
|
|
|
|
/* The memory clock may not exceed 8 MHz */
|
|
if (priv->can.clock.freq > 8000000)
|
|
priv->cpu_interface |= CPUIF_DMC;
|
|
|
|
if (of_get_property(np, "bosch,divide-memory-clock", NULL))
|
|
priv->cpu_interface |= CPUIF_DMC;
|
|
if (of_get_property(np, "bosch,iso-low-speed-mux", NULL))
|
|
priv->cpu_interface |= CPUIF_MUX;
|
|
|
|
if (!of_get_property(np, "bosch,no-comperator-bypass", NULL))
|
|
priv->bus_config |= BUSCFG_CBY;
|
|
if (of_get_property(np, "bosch,disconnect-rx0-input", NULL))
|
|
priv->bus_config |= BUSCFG_DR0;
|
|
if (of_get_property(np, "bosch,disconnect-rx1-input", NULL))
|
|
priv->bus_config |= BUSCFG_DR1;
|
|
if (of_get_property(np, "bosch,disconnect-tx1-output", NULL))
|
|
priv->bus_config |= BUSCFG_DT1;
|
|
if (of_get_property(np, "bosch,polarity-dominant", NULL))
|
|
priv->bus_config |= BUSCFG_POL;
|
|
|
|
prop = of_get_property(np, "bosch,clock-out-frequency", &prop_size);
|
|
if (prop && (prop_size == sizeof(u32)) && *prop > 0) {
|
|
u32 cdv = clkext / *prop;
|
|
int slew;
|
|
|
|
if (cdv > 0 && cdv < 16) {
|
|
priv->cpu_interface |= CPUIF_CEN;
|
|
priv->clkout |= (cdv - 1) & CLKOUT_CD_MASK;
|
|
|
|
prop = of_get_property(np, "bosch,slew-rate",
|
|
&prop_size);
|
|
if (prop && (prop_size == sizeof(u32))) {
|
|
slew = *prop;
|
|
} else {
|
|
/* Determine default slew rate */
|
|
slew = (CLKOUT_SL_MASK >>
|
|
CLKOUT_SL_SHIFT) -
|
|
((cdv * clkext - 1) / 8000000);
|
|
if (slew < 0)
|
|
slew = 0;
|
|
}
|
|
priv->clkout |= (slew << CLKOUT_SL_SHIFT) &
|
|
CLKOUT_SL_MASK;
|
|
} else {
|
|
dev_dbg(&pdev->dev, "invalid clock-out-frequency\n");
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cc770_get_platform_data(struct platform_device *pdev,
|
|
struct cc770_priv *priv)
|
|
{
|
|
|
|
struct cc770_platform_data *pdata = dev_get_platdata(&pdev->dev);
|
|
|
|
priv->can.clock.freq = pdata->osc_freq;
|
|
if (priv->cpu_interface & CPUIF_DSC)
|
|
priv->can.clock.freq /= 2;
|
|
priv->clkout = pdata->cor;
|
|
priv->bus_config = pdata->bcr;
|
|
priv->cpu_interface = pdata->cir;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cc770_platform_probe(struct platform_device *pdev)
|
|
{
|
|
struct net_device *dev;
|
|
struct cc770_priv *priv;
|
|
struct resource *mem;
|
|
resource_size_t mem_size;
|
|
void __iomem *base;
|
|
int err, irq;
|
|
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (!mem || irq <= 0)
|
|
return -ENODEV;
|
|
|
|
mem_size = resource_size(mem);
|
|
if (!request_mem_region(mem->start, mem_size, pdev->name))
|
|
return -EBUSY;
|
|
|
|
base = ioremap(mem->start, mem_size);
|
|
if (!base) {
|
|
err = -ENOMEM;
|
|
goto exit_release_mem;
|
|
}
|
|
|
|
dev = alloc_cc770dev(0);
|
|
if (!dev) {
|
|
err = -ENOMEM;
|
|
goto exit_unmap_mem;
|
|
}
|
|
|
|
dev->irq = irq;
|
|
priv = netdev_priv(dev);
|
|
priv->read_reg = cc770_platform_read_reg;
|
|
priv->write_reg = cc770_platform_write_reg;
|
|
priv->irq_flags = IRQF_SHARED;
|
|
priv->reg_base = base;
|
|
|
|
if (pdev->dev.of_node)
|
|
err = cc770_get_of_node_data(pdev, priv);
|
|
else if (dev_get_platdata(&pdev->dev))
|
|
err = cc770_get_platform_data(pdev, priv);
|
|
else
|
|
err = -ENODEV;
|
|
if (err)
|
|
goto exit_free_cc770;
|
|
|
|
dev_dbg(&pdev->dev,
|
|
"reg_base=0x%p irq=%d clock=%d cpu_interface=0x%02x "
|
|
"bus_config=0x%02x clkout=0x%02x\n",
|
|
priv->reg_base, dev->irq, priv->can.clock.freq,
|
|
priv->cpu_interface, priv->bus_config, priv->clkout);
|
|
|
|
platform_set_drvdata(pdev, dev);
|
|
SET_NETDEV_DEV(dev, &pdev->dev);
|
|
|
|
err = register_cc770dev(dev);
|
|
if (err) {
|
|
dev_err(&pdev->dev,
|
|
"couldn't register CC700 device (err=%d)\n", err);
|
|
goto exit_free_cc770;
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit_free_cc770:
|
|
free_cc770dev(dev);
|
|
exit_unmap_mem:
|
|
iounmap(base);
|
|
exit_release_mem:
|
|
release_mem_region(mem->start, mem_size);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int cc770_platform_remove(struct platform_device *pdev)
|
|
{
|
|
struct net_device *dev = platform_get_drvdata(pdev);
|
|
struct cc770_priv *priv = netdev_priv(dev);
|
|
struct resource *mem;
|
|
|
|
unregister_cc770dev(dev);
|
|
iounmap(priv->reg_base);
|
|
free_cc770dev(dev);
|
|
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
release_mem_region(mem->start, resource_size(mem));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id cc770_platform_table[] = {
|
|
{.compatible = "bosch,cc770"}, /* CC770 from Bosch */
|
|
{.compatible = "intc,82527"}, /* AN82527 from Intel CP */
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, cc770_platform_table);
|
|
|
|
static struct platform_driver cc770_platform_driver = {
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.of_match_table = cc770_platform_table,
|
|
},
|
|
.probe = cc770_platform_probe,
|
|
.remove = cc770_platform_remove,
|
|
};
|
|
|
|
module_platform_driver(cc770_platform_driver);
|