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