// SPDX-License-Identifier: GPL-2.0
/*
* xtsonic . c
*
* ( C ) 2001 - 2007 Tensilica Inc .
* Kevin Chea < kchea @ yahoo . com >
* Marc Gauthier < marc @ linux - xtensa . org >
* Chris Zankel < chris @ zankel . net >
*
* ( C ) 1996 , 1998 by Thomas Bogendoerfer ( tsbogend @ alpha . franken . de )
*
* This driver is based on work from Andreas Busse , but most of
* the code is rewritten .
*
* ( C ) 1995 by Andreas Busse ( andy @ waldorf - gmbh . de )
*
* A driver for the onboard Sonic ethernet controller on the XT2000 .
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/gfp.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/pgtable.h>
#include <asm /io.h>
#include <asm /dma.h>
static char xtsonic_string[] = "xtsonic" ;
extern unsigned xtboard_nvram_valid(void );
extern void xtboard_get_ether_addr(unsigned char *buf);
#include "sonic.h"
/*
* According to the documentation for the Sonic ethernet controller ,
* EOBC should be 760 words ( 1520 bytes ) for 32 - bit applications , and ,
* as such , 2 words less than the buffer size . The value for RBSIZE
* defined in sonic . h , however is only 1520 .
*
* ( Note that in 16 - bit configurations , EOBC is 759 words ( 1518 bytes ) and
* RBSIZE 1520 bytes )
*/
#undef SONIC_RBSIZE
#define SONIC_RBSIZE 1524
/*
* The chip provides 256 byte register space .
*/
#define SONIC_MEM_SIZE 0 x100
/*
* Macros to access SONIC registers
*/
#define SONIC_READ(reg) \
(0 xffff & *((volatile unsigned int *)dev->base_addr+reg))
#define SONIC_WRITE(reg,val) \
*((volatile unsigned int *)dev->base_addr+reg) = val
/*
* We cannot use station ( ethernet ) address prefixes to detect the
* sonic controller since these are board manufacturer depended .
* So we check for known Silicon Revision IDs instead .
*/
static unsigned short known_revisions[] =
{
0 x101, /* SONIC 83934 */
0 xffff /* end of list */
};
static int xtsonic_open(struct net_device *dev)
{
int retval;
retval = request_irq(dev->irq, sonic_interrupt, 0 , "sonic" , dev);
if (retval) {
printk(KERN_ERR "%s: unable to get IRQ %d.\n" ,
dev->name, dev->irq);
return -EAGAIN;
}
retval = sonic_open(dev);
if (retval)
free_irq(dev->irq, dev);
return retval;
}
static int xtsonic_close(struct net_device *dev)
{
int err;
err = sonic_close(dev);
free_irq(dev->irq, dev);
return err;
}
static const struct net_device_ops xtsonic_netdev_ops = {
.ndo_open = xtsonic_open,
.ndo_stop = xtsonic_close,
.ndo_start_xmit = sonic_send_packet,
.ndo_get_stats = sonic_get_stats,
.ndo_set_rx_mode = sonic_multicast_list,
.ndo_tx_timeout = sonic_tx_timeout,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = eth_mac_addr,
};
static int sonic_probe1(struct net_device *dev)
{
unsigned int silicon_revision;
struct sonic_local *lp = netdev_priv(dev);
unsigned int base_addr = dev->base_addr;
int i;
int err = 0 ;
unsigned char addr[ETH_ALEN];
if (!request_mem_region(base_addr, 0 x100, xtsonic_string))
return -EBUSY;
/*
* get the Silicon Revision ID . If this is one of the known
* one assume that we found a SONIC ethernet controller at
* the expected location .
*/
silicon_revision = SONIC_READ(SONIC_SR);
i = 0 ;
while ((known_revisions[i] != 0 xffff) &&
(known_revisions[i] != silicon_revision))
i++;
if (known_revisions[i] == 0 xffff) {
pr_info("SONIC ethernet controller not found (0x%4x)\n" ,
silicon_revision);
return -ENODEV;
}
/*
* Put the sonic into software reset , then retrieve ethernet address .
* Note : we are assuming that the boot - loader has initialized the cam .
*/
SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
SONIC_WRITE(SONIC_DCR,
SONIC_DCR_WC0|SONIC_DCR_DW|SONIC_DCR_LBR|SONIC_DCR_SBUS);
SONIC_WRITE(SONIC_CEP,0 );
SONIC_WRITE(SONIC_IMR,0 );
SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
SONIC_WRITE(SONIC_CEP,0 );
for (i=0 ; i<3 ; i++) {
unsigned int val = SONIC_READ(SONIC_CAP0-i);
addr[i*2 ] = val;
addr[i*2 +1 ] = val >> 8 ;
}
eth_hw_addr_set(dev, addr);
lp->dma_bitmode = SONIC_BITMODE32;
err = sonic_alloc_descriptors(dev);
if (err)
goto out;
dev->netdev_ops = &xtsonic_netdev_ops;
dev->watchdog_timeo = TX_TIMEOUT;
/*
* clear tally counter
*/
SONIC_WRITE(SONIC_CRCT,0 xffff);
SONIC_WRITE(SONIC_FAET,0 xffff);
SONIC_WRITE(SONIC_MPT,0 xffff);
return 0 ;
out:
release_region(dev->base_addr, SONIC_MEM_SIZE);
return err;
}
/*
* Probe for a SONIC ethernet controller on an XT2000 board .
* Actually probing is superfluous but we ' re paranoid .
*/
int xtsonic_probe(struct platform_device *pdev)
{
struct net_device *dev;
struct sonic_local *lp;
struct resource *resmem, *resirq;
int err = 0 ;
if ((resmem = platform_get_resource(pdev, IORESOURCE_MEM, 0 )) == NULL)
return -ENODEV;
if ((resirq = platform_get_resource(pdev, IORESOURCE_IRQ, 0 )) == NULL)
return -ENODEV;
if ((dev = alloc_etherdev(sizeof (struct sonic_local))) == NULL)
return -ENOMEM;
lp = netdev_priv(dev);
lp->device = &pdev->dev;
platform_set_drvdata(pdev, dev);
SET_NETDEV_DEV(dev, &pdev->dev);
dev->base_addr = resmem->start;
dev->irq = resirq->start;
if ((err = sonic_probe1(dev)))
goto out;
pr_info("SONIC ethernet @%08lx, MAC %pM, IRQ %d\n" ,
dev->base_addr, dev->dev_addr, dev->irq);
sonic_msg_init(dev);
if ((err = register_netdev(dev)))
goto undo_probe1;
return 0 ;
undo_probe1:
dma_free_coherent(lp->device,
SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
lp->descriptors, lp->descriptors_laddr);
release_region(dev->base_addr, SONIC_MEM_SIZE);
out:
free_netdev(dev);
return err;
}
MODULE_DESCRIPTION("Xtensa XT2000 SONIC ethernet driver" );
#include "sonic.c"
static void xtsonic_device_remove(struct platform_device *pdev)
{
struct net_device *dev = platform_get_drvdata(pdev);
struct sonic_local *lp = netdev_priv(dev);
unregister_netdev(dev);
dma_free_coherent(lp->device,
SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
lp->descriptors, lp->descriptors_laddr);
release_region (dev->base_addr, SONIC_MEM_SIZE);
free_netdev(dev);
}
static struct platform_driver xtsonic_driver = {
.probe = xtsonic_probe,
.remove = xtsonic_device_remove,
.driver = {
.name = xtsonic_string,
},
};
module_platform_driver(xtsonic_driver);
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