sni_82596.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * sni_82596.c -- driver for intel 82596 ethernet controller, as
  4 *  		  used in older SNI RM machines
  5 */
  6
  7#include <linux/module.h>
  8#include <linux/kernel.h>
  9#include <linux/string.h>
 10#include <linux/errno.h>
 11#include <linux/ioport.h>
 12#include <linux/interrupt.h>
 13#include <linux/delay.h>
 14#include <linux/netdevice.h>
 15#include <linux/etherdevice.h>
 16#include <linux/skbuff.h>
 17#include <linux/types.h>
 18#include <linux/bitops.h>
 19#include <linux/platform_device.h>
 20#include <linux/io.h>
 21#include <linux/irq.h>
 22
 23#define SNI_82596_DRIVER_VERSION "SNI RM 82596 driver - Revision: 0.01"
 24
 25static const char sni_82596_string[] = "snirm_82596";
 26
 27#define SYSBUS      0x00004400
 28
 29/* big endian CPU, 82596 little endian */
 30#define SWAP32(x)   cpu_to_le32((u32)(x))
 31#define SWAP16(x)   cpu_to_le16((u16)(x))
 32
 33#define OPT_MPU_16BIT    0x01
 34
 35#include "lib82596.c"
 36
 37MODULE_AUTHOR("Thomas Bogendoerfer");
 38MODULE_DESCRIPTION("i82596 driver");
 39MODULE_LICENSE("GPL");
 40MODULE_ALIAS("platform:snirm_82596");
 41module_param(i596_debug, int, 0);
 42MODULE_PARM_DESC(i596_debug, "82596 debug mask");
 43
 44static inline void ca(struct net_device *dev)
 45{
 46	struct i596_private *lp = netdev_priv(dev);
 47
 48	writel(0, lp->ca);
 49}
 50
 51
 52static void mpu_port(struct net_device *dev, int c, dma_addr_t x)
 53{
 54	struct i596_private *lp = netdev_priv(dev);
 55
 56	u32 v = (u32) (c) | (u32) (x);
 57
 58	if (lp->options & OPT_MPU_16BIT) {
 59		writew(v & 0xffff, lp->mpu_port);
 60		wmb();  /* order writes to MPU port */
 61		udelay(1);
 62		writew(v >> 16, lp->mpu_port);
 63	} else {
 64		writel(v, lp->mpu_port);
 65		wmb();  /* order writes to MPU port */
 66		udelay(1);
 67		writel(v, lp->mpu_port);
 68	}
 69}
 70
 71
 72static int sni_82596_probe(struct platform_device *dev)
 73{
 74	struct	net_device *netdevice;
 75	struct i596_private *lp;
 76	struct  resource *res, *ca, *idprom, *options;
 77	int	retval = -ENOMEM;
 78	void __iomem *mpu_addr;
 79	void __iomem *ca_addr;
 80	u8 __iomem *eth_addr;
 81	u8 mac[ETH_ALEN];
 82
 83	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 84	ca = platform_get_resource(dev, IORESOURCE_MEM, 1);
 85	options = platform_get_resource(dev, 0, 0);
 86	idprom = platform_get_resource(dev, IORESOURCE_MEM, 2);
 87	if (!res || !ca || !options || !idprom)
 88		return -ENODEV;
 89	mpu_addr = ioremap(res->start, 4);
 90	if (!mpu_addr)
 91		return -ENOMEM;
 92	ca_addr = ioremap(ca->start, 4);
 93	if (!ca_addr)
 94		goto probe_failed_free_mpu;
 95
 96	printk(KERN_INFO "Found i82596 at 0x%x\n", res->start);
 97
 98	netdevice = alloc_etherdev(sizeof(struct i596_private));
 99	if (!netdevice)
100		goto probe_failed_free_ca;
101
102	SET_NETDEV_DEV(netdevice, &dev->dev);
103	platform_set_drvdata (dev, netdevice);
104
105	netdevice->base_addr = res->start;
106	netdevice->irq = platform_get_irq(dev, 0);
107
108	eth_addr = ioremap(idprom->start, 0x10);
109	if (!eth_addr)
110		goto probe_failed;
111
112	/* someone seems to like messed up stuff */
113	mac[0] = readb(eth_addr + 0x0b);
114	mac[1] = readb(eth_addr + 0x0a);
115	mac[2] = readb(eth_addr + 0x09);
116	mac[3] = readb(eth_addr + 0x08);
117	mac[4] = readb(eth_addr + 0x07);
118	mac[5] = readb(eth_addr + 0x06);
119	eth_hw_addr_set(netdevice, mac);
120	iounmap(eth_addr);
121
122	if (netdevice->irq < 0) {
123		printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
124			__FILE__, netdevice->base_addr);
125		retval = netdevice->irq;
126		goto probe_failed;
127	}
128
129	lp = netdev_priv(netdevice);
130	lp->options = options->flags & IORESOURCE_BITS;
131	lp->ca = ca_addr;
132	lp->mpu_port = mpu_addr;
133
134	lp->dma = dma_alloc_coherent(&dev->dev, sizeof(struct i596_dma),
135				     &lp->dma_addr, GFP_KERNEL);
136	if (!lp->dma)
137		goto probe_failed;
138
139	retval = i82596_probe(netdevice);
140	if (retval)
141		goto probe_failed_free_dma;
142	return 0;
143
144probe_failed_free_dma:
145	dma_free_coherent(&dev->dev, sizeof(struct i596_dma), lp->dma,
146			  lp->dma_addr);
147probe_failed:
148	free_netdev(netdevice);
149probe_failed_free_ca:
150	iounmap(ca_addr);
151probe_failed_free_mpu:
152	iounmap(mpu_addr);
153	return retval;
154}
155
156static void sni_82596_driver_remove(struct platform_device *pdev)
157{
158	struct net_device *dev = platform_get_drvdata(pdev);
159	struct i596_private *lp = netdev_priv(dev);
160
161	unregister_netdev(dev);
162	dma_free_coherent(&pdev->dev, sizeof(struct i596_private), lp->dma,
163			  lp->dma_addr);
164	iounmap(lp->ca);
165	iounmap(lp->mpu_port);
166	free_netdev (dev);
167}
168
169static struct platform_driver sni_82596_driver = {
170	.probe	= sni_82596_probe,
171	.remove = sni_82596_driver_remove,
172	.driver	= {
173		.name	= sni_82596_string,
174	},
175};
176
177static int sni_82596_init(void)
178{
179	printk(KERN_INFO SNI_82596_DRIVER_VERSION "\n");
180	return platform_driver_register(&sni_82596_driver);
181}
182
183
184static void __exit sni_82596_exit(void)
185{
186	platform_driver_unregister(&sni_82596_driver);
187}
188
189module_init(sni_82596_init);
190module_exit(sni_82596_exit);