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 | |
44 | static inline void ca(struct net_device *dev) |
45 | { |
46 | struct i596_private *lp = netdev_priv(dev); |
47 | |
48 | writel(val: 0, addr: lp->ca); |
49 | } |
50 | |
51 | |
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(val: v & 0xffff, addr: lp->mpu_port); |
60 | wmb(); /* order writes to MPU port */ |
61 | udelay(1); |
62 | writew(val: v >> 16, addr: lp->mpu_port); |
63 | } else { |
64 | writel(val: v, addr: lp->mpu_port); |
65 | wmb(); /* order writes to MPU port */ |
66 | udelay(1); |
67 | writel(val: v, addr: lp->mpu_port); |
68 | } |
69 | } |
70 | |
71 | |
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(offset: res->start, size: 4); |
90 | if (!mpu_addr) |
91 | return -ENOMEM; |
92 | ca_addr = ioremap(offset: ca->start, size: 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 (pdev: dev, data: netdevice); |
104 | |
105 | netdevice->base_addr = res->start; |
106 | netdevice->irq = platform_get_irq(dev, 0); |
107 | |
108 | eth_addr = ioremap(offset: idprom->start, size: 0x10); |
109 | if (!eth_addr) |
110 | goto probe_failed; |
111 | |
112 | /* someone seems to like messed up stuff */ |
113 | mac[0] = readb(addr: eth_addr + 0x0b); |
114 | mac[1] = readb(addr: eth_addr + 0x0a); |
115 | mac[2] = readb(addr: eth_addr + 0x09); |
116 | mac[3] = readb(addr: eth_addr + 0x08); |
117 | mac[4] = readb(addr: eth_addr + 0x07); |
118 | mac[5] = readb(addr: eth_addr + 0x06); |
119 | eth_hw_addr_set(dev: netdevice, addr: mac); |
120 | iounmap(addr: 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(dev: 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->dev, size: sizeof(struct i596_dma), |
135 | dma_handle: &lp->dma_addr, GFP_KERNEL); |
136 | if (!lp->dma) |
137 | goto probe_failed; |
138 | |
139 | retval = i82596_probe(dev: 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->dev, size: sizeof(struct i596_dma), cpu_addr: lp->dma, |
146 | dma_handle: lp->dma_addr); |
147 | probe_failed: |
148 | free_netdev(dev: netdevice); |
149 | probe_failed_free_ca: |
150 | iounmap(addr: ca_addr); |
151 | probe_failed_free_mpu: |
152 | iounmap(addr: mpu_addr); |
153 | return retval; |
154 | } |
155 | |
156 | static 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(dev: &pdev->dev, size: sizeof(struct i596_private), cpu_addr: lp->dma, |
163 | dma_handle: lp->dma_addr); |
164 | iounmap(addr: lp->ca); |
165 | iounmap(addr: lp->mpu_port); |
166 | free_netdev (dev); |
167 | } |
168 | |
169 | static struct platform_driver sni_82596_driver = { |
170 | .probe = sni_82596_probe, |
171 | .remove_new = sni_82596_driver_remove, |
172 | .driver = { |
173 | .name = sni_82596_string, |
174 | }, |
175 | }; |
176 | |
177 | static 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 | |
184 | static void __exit sni_82596_exit(void) |
185 | { |
186 | platform_driver_unregister(&sni_82596_driver); |
187 | } |
188 | |
189 | module_init(sni_82596_init); |
190 | module_exit(sni_82596_exit); |
191 | |