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// SPDX-License-Identifier: GPL-2.0-only
/* stnic.c : A SH7750 specific part of driver for NS DP83902A ST-NIC.
*
* Copyright (C) 1999 kaz Kojima
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <mach-se/mach/se.h>
#include <asm/machvec.h>
#ifdef CONFIG_SH_STANDARD_BIOS
#include <asm/sh_bios.h>
#endif
#include "8390.h"
#define DRV_NAME "stnic"
#define byte unsigned char
#define half unsigned short
#define word unsigned int
#define vbyte volatile unsigned char
#define vhalf volatile unsigned short
#define vword volatile unsigned int
#define STNIC_RUN 0x01 /* 1 == Run, 0 == reset. */
#define START_PG 0 /* First page of TX buffer */
#define STOP_PG 128 /* Last page +1 of RX ring */
/* Alias */
#define STNIC_CR E8390_CMD
#define PG0_RSAR0 EN0_RSARLO
#define PG0_RSAR1 EN0_RSARHI
#define PG0_RBCR0 EN0_RCNTLO
#define PG0_RBCR1 EN0_RCNTHI
#define CR_RRD E8390_RREAD
#define CR_RWR E8390_RWRITE
#define CR_PG0 E8390_PAGE0
#define CR_STA E8390_START
#define CR_RDMA E8390_NODMA
/* FIXME! YOU MUST SET YOUR OWN ETHER ADDRESS. */
static byte stnic_eadr[6] =
{0x00, 0xc0, 0x6e, 0x00, 0x00, 0x07};
static struct net_device *stnic_dev;
static void stnic_reset (struct net_device *dev);
static void stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
int ring_page);
static void stnic_block_input (struct net_device *dev, int count,
struct sk_buff *skb , int ring_offset);
static void stnic_block_output (struct net_device *dev, int count,
const unsigned char *buf, int start_page);
static void stnic_init (struct net_device *dev);
static u32 stnic_msg_enable;
module_param_named(msg_enable, stnic_msg_enable, uint, 0444);
MODULE_PARM_DESC(msg_enable, "Debug message level (see linux/netdevice.h for bitmap)");
/* SH7750 specific read/write io. */
static inline void
STNIC_DELAY (void)
{
vword trash;
trash = *(vword *) 0xa0000000;
trash = *(vword *) 0xa0000000;
trash = *(vword *) 0xa0000000;
}
static inline byte
STNIC_READ (int reg)
{
byte val;
val = (*(vhalf *) (PA_83902 + ((reg) << 1)) >> 8) & 0xff;
STNIC_DELAY ();
return val;
}
static inline void
STNIC_WRITE (int reg, byte val)
{
*(vhalf *) (PA_83902 + ((reg) << 1)) = ((half) (val) << 8);
STNIC_DELAY ();
}
static int __init stnic_probe(void)
{
struct net_device *dev;
struct ei_device *ei_local;
int err;
/* If we are not running on a SolutionEngine, give up now */
if (! MACH_SE)
return -ENODEV;
/* New style probing API */
dev = alloc_ei_netdev();
if (!dev)
return -ENOMEM;
#ifdef CONFIG_SH_STANDARD_BIOS
sh_bios_get_node_addr (stnic_eadr);
#endif
eth_hw_addr_set(dev, stnic_eadr);
/* Set the base address to point to the NIC, not the "real" base! */
dev->base_addr = 0x1000;
dev->irq = IRQ_STNIC;
dev->netdev_ops = &ei_netdev_ops;
/* Snarf the interrupt now. There's no point in waiting since we cannot
share and the board will usually be enabled. */
err = request_irq (dev->irq, ei_interrupt, 0, DRV_NAME, dev);
if (err) {
netdev_emerg(dev, " unable to get IRQ %d.\n", dev->irq);
free_netdev(dev);
return err;
}
ei_status.name = dev->name;
ei_status.word16 = 1;
#ifdef __LITTLE_ENDIAN__
ei_status.bigendian = 0;
#else
ei_status.bigendian = 1;
#endif
ei_status.tx_start_page = START_PG;
ei_status.rx_start_page = START_PG + TX_PAGES;
ei_status.stop_page = STOP_PG;
ei_status.reset_8390 = &stnic_reset;
ei_status.get_8390_hdr = &stnic_get_hdr;
ei_status.block_input = &stnic_block_input;
ei_status.block_output = &stnic_block_output;
stnic_init (dev);
ei_local = netdev_priv(dev);
ei_local->msg_enable = stnic_msg_enable;
err = register_netdev(dev);
if (err) {
free_irq(dev->irq, dev);
free_netdev(dev);
return err;
}
stnic_dev = dev;
netdev_info(dev, "NS ST-NIC 83902A\n");
return 0;
}
static void
stnic_reset (struct net_device *dev)
{
struct ei_device *ei_local = netdev_priv(dev);
*(vhalf *) PA_83902_RST = 0;
udelay (5);
netif_warn(ei_local, hw, dev, "8390 reset done (%ld).\n", jiffies);
*(vhalf *) PA_83902_RST = ~0;
udelay (5);
}
static void
stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
int ring_page)
{
struct ei_device *ei_local = netdev_priv(dev);
half buf[2];
STNIC_WRITE (PG0_RSAR0, 0);
STNIC_WRITE (PG0_RSAR1, ring_page);
STNIC_WRITE (PG0_RBCR0, 4);
STNIC_WRITE (PG0_RBCR1, 0);
STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
buf[0] = *(vhalf *) PA_83902_IF;
STNIC_DELAY ();
buf[1] = *(vhalf *) PA_83902_IF;
STNIC_DELAY ();
hdr->next = buf[0] >> 8;
hdr->status = buf[0] & 0xff;
#ifdef __LITTLE_ENDIAN__
hdr->count = buf[1];
#else
hdr->count = ((buf[1] >> 8) & 0xff) | (buf[1] << 8);
#endif
netif_dbg(ei_local, probe, dev, "ring %x status %02x next %02x count %04x.\n",
ring_page, hdr->status, hdr->next, hdr->count);
STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
}
/* Block input and output, similar to the Crynwr packet driver. If you are
porting to a new ethercard look at the packet driver source for hints.
The HP LAN doesn't use shared memory -- we put the packet
out through the "remote DMA" dataport. */
static void
stnic_block_input (struct net_device *dev, int length, struct sk_buff *skb,
int offset)
{
char *buf = skb->data;
half val;
STNIC_WRITE (PG0_RSAR0, offset & 0xff);
STNIC_WRITE (PG0_RSAR1, offset >> 8);
STNIC_WRITE (PG0_RBCR0, length & 0xff);
STNIC_WRITE (PG0_RBCR1, length >> 8);
STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
if (length & 1)
length++;
while (length > 0)
{
val = *(vhalf *) PA_83902_IF;
#ifdef __LITTLE_ENDIAN__
*buf++ = val & 0xff;
*buf++ = val >> 8;
#else
*buf++ = val >> 8;
*buf++ = val & 0xff;
#endif
STNIC_DELAY ();
length -= sizeof (half);
}
STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
}
static void
stnic_block_output (struct net_device *dev, int length,
const unsigned char *buf, int output_page)
{
STNIC_WRITE (PG0_RBCR0, 1); /* Write non-zero value */
STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
STNIC_DELAY ();
STNIC_WRITE (PG0_RBCR0, length & 0xff);
STNIC_WRITE (PG0_RBCR1, length >> 8);
STNIC_WRITE (PG0_RSAR0, 0);
STNIC_WRITE (PG0_RSAR1, output_page);
STNIC_WRITE (STNIC_CR, CR_RWR | CR_PG0 | CR_STA);
if (length & 1)
length++;
while (length > 0)
{
#ifdef __LITTLE_ENDIAN__
*(vhalf *) PA_83902_IF = ((half) buf[1] << 8) | buf[0];
#else
*(vhalf *) PA_83902_IF = ((half) buf[0] << 8) | buf[1];
#endif
STNIC_DELAY ();
buf += sizeof (half);
length -= sizeof (half);
}
STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
}
/* This function resets the STNIC if something screws up. */
static void
stnic_init (struct net_device *dev)
{
stnic_reset (dev);
NS8390_init (dev, 0);
}
static void __exit stnic_cleanup(void)
{
unregister_netdev(stnic_dev);
free_irq(stnic_dev->irq, stnic_dev);
free_netdev(stnic_dev);
}
module_init(stnic_probe);
module_exit(stnic_cleanup);
MODULE_DESCRIPTION("National Semiconductor DP83902AV ethernet driver");
MODULE_LICENSE("GPL");
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