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
82 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
83 ca = platform_get_resource(dev, IORESOURCE_MEM, 1);
84 options = platform_get_resource(dev, 0, 0);
85 idprom = platform_get_resource(dev, IORESOURCE_MEM, 2);
86 if (!res || !ca || !options || !idprom)
87 return -ENODEV;
88 mpu_addr = ioremap(res->start, 4);
89 if (!mpu_addr)
90 return -ENOMEM;
91 ca_addr = ioremap(ca->start, 4);
92 if (!ca_addr)
93 goto probe_failed_free_mpu;
94
95 printk(KERN_INFO "Found i82596 at 0x%x\n", res->start);
96
97 netdevice = alloc_etherdev(sizeof(struct i596_private));
98 if (!netdevice)
99 goto probe_failed_free_ca;
100
101 SET_NETDEV_DEV(netdevice, &dev->dev);
102 platform_set_drvdata (dev, netdevice);
103
104 netdevice->base_addr = res->start;
105 netdevice->irq = platform_get_irq(dev, 0);
106
107 eth_addr = ioremap(idprom->start, 0x10);
108 if (!eth_addr)
109 goto probe_failed;
110
111 /* someone seems to like messed up stuff */
112 netdevice->dev_addr[0] = readb(eth_addr + 0x0b);
113 netdevice->dev_addr[1] = readb(eth_addr + 0x0a);
114 netdevice->dev_addr[2] = readb(eth_addr + 0x09);
115 netdevice->dev_addr[3] = readb(eth_addr + 0x08);
116 netdevice->dev_addr[4] = readb(eth_addr + 0x07);
117 netdevice->dev_addr[5] = readb(eth_addr + 0x06);
118 iounmap(eth_addr);
119
120 if (netdevice->irq < 0) {
121 printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
122 __FILE__, netdevice->base_addr);
123 retval = netdevice->irq;
124 goto probe_failed;
125 }
126
127 lp = netdev_priv(netdevice);
128 lp->options = options->flags & IORESOURCE_BITS;
129 lp->ca = ca_addr;
130 lp->mpu_port = mpu_addr;
131
132 lp->dma = dma_alloc_coherent(&dev->dev, sizeof(struct i596_dma),
133 &lp->dma_addr, GFP_KERNEL);
134 if (!lp->dma)
135 goto probe_failed;
136
137 retval = i82596_probe(netdevice);
138 if (retval)
139 goto probe_failed_free_dma;
140 return 0;
141
142 probe_failed_free_dma:
143 dma_free_coherent(&dev->dev, sizeof(struct i596_dma), lp->dma,
144 lp->dma_addr);
145 probe_failed:
146 free_netdev(netdevice);
147 probe_failed_free_ca:
148 iounmap(ca_addr);
149 probe_failed_free_mpu:
150 iounmap(mpu_addr);
151 return retval;
152 }
153
sni_82596_driver_remove(struct platform_device * pdev)154 static int sni_82596_driver_remove(struct platform_device *pdev)
155 {
156 struct net_device *dev = platform_get_drvdata(pdev);
157 struct i596_private *lp = netdev_priv(dev);
158
159 unregister_netdev(dev);
160 dma_free_coherent(&pdev->dev, sizeof(struct i596_private), lp->dma,
161 lp->dma_addr);
162 iounmap(lp->ca);
163 iounmap(lp->mpu_port);
164 free_netdev (dev);
165 return 0;
166 }
167
168 static struct platform_driver sni_82596_driver = {
169 .probe = sni_82596_probe,
170 .remove = sni_82596_driver_remove,
171 .driver = {
172 .name = sni_82596_string,
173 },
174 };
175
sni_82596_init(void)176 static int sni_82596_init(void)
177 {
178 printk(KERN_INFO SNI_82596_DRIVER_VERSION "\n");
179 return platform_driver_register(&sni_82596_driver);
180 }
181
182
sni_82596_exit(void)183 static void __exit sni_82596_exit(void)
184 {
185 platform_driver_unregister(&sni_82596_driver);
186 }
187
188 module_init(sni_82596_init);
189 module_exit(sni_82596_exit);
190