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
25 static 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
37 MODULE_AUTHOR("Thomas Bogendoerfer");
38 MODULE_DESCRIPTION("i82596 driver");
39 MODULE_LICENSE("GPL");
40 MODULE_ALIAS("platform:snirm_82596");
41 module_param(i596_debug, int, 0);
42 MODULE_PARM_DESC(i596_debug, "82596 debug mask");
43
ca(struct net_device * dev)44 static 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
mpu_port(struct net_device * dev,int c,dma_addr_t x)52 static 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
sni_82596_probe(struct platform_device * dev)72 static 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
144 probe_failed_free_dma:
145 dma_free_coherent(&dev->dev, sizeof(struct i596_dma), lp->dma,
146 lp->dma_addr);
147 probe_failed:
148 free_netdev(netdevice);
149 probe_failed_free_ca:
150 iounmap(ca_addr);
151 probe_failed_free_mpu:
152 iounmap(mpu_addr);
153 return retval;
154 }
155
sni_82596_driver_remove(struct platform_device * pdev)156 static int 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 return 0;
168 }
169
170 static struct platform_driver sni_82596_driver = {
171 .probe = sni_82596_probe,
172 .remove = sni_82596_driver_remove,
173 .driver = {
174 .name = sni_82596_string,
175 },
176 };
177
sni_82596_init(void)178 static int sni_82596_init(void)
179 {
180 printk(KERN_INFO SNI_82596_DRIVER_VERSION "\n");
181 return platform_driver_register(&sni_82596_driver);
182 }
183
184
sni_82596_exit(void)185 static void __exit sni_82596_exit(void)
186 {
187 platform_driver_unregister(&sni_82596_driver);
188 }
189
190 module_init(sni_82596_init);
191 module_exit(sni_82596_exit);
192