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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /* mvme147.c  : the  Linux/mvme147/lance ethernet driver
0003  *
0004  * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
0005  * Based on the Sun Lance driver and the NetBSD HP Lance driver
0006  * Uses the generic 7990.c LANCE code.
0007  */
0008 
0009 #include <linux/module.h>
0010 #include <linux/kernel.h>
0011 #include <linux/types.h>
0012 #include <linux/interrupt.h>
0013 #include <linux/ioport.h>
0014 #include <linux/string.h>
0015 #include <linux/delay.h>
0016 #include <linux/init.h>
0017 #include <linux/errno.h>
0018 #include <linux/gfp.h>
0019 #include <linux/pgtable.h>
0020 /* Used for the temporal inet entries and routing */
0021 #include <linux/socket.h>
0022 #include <linux/route.h>
0023 #include <linux/netdevice.h>
0024 #include <linux/etherdevice.h>
0025 #include <linux/skbuff.h>
0026 
0027 #include <asm/io.h>
0028 #include <asm/mvme147hw.h>
0029 
0030 /* We have 32K of RAM for the init block and buffers. This places
0031  * an upper limit on the number of buffers we can use. NetBSD uses 8 Rx
0032  * buffers and 2 Tx buffers, it takes (8 + 2) * 1544 bytes.
0033  */
0034 #define LANCE_LOG_TX_BUFFERS 1
0035 #define LANCE_LOG_RX_BUFFERS 3
0036 
0037 #include "7990.h"                                 /* use generic LANCE code */
0038 
0039 /* Our private data structure */
0040 struct m147lance_private {
0041     struct lance_private lance;
0042     unsigned long ram;
0043 };
0044 
0045 /* function prototypes... This is easy because all the grot is in the
0046  * generic LANCE support. All we have to support is probing for boards,
0047  * plus board-specific init, open and close actions.
0048  * Oh, and we need to tell the generic code how to read and write LANCE registers...
0049  */
0050 static int m147lance_open(struct net_device *dev);
0051 static int m147lance_close(struct net_device *dev);
0052 static void m147lance_writerap(struct lance_private *lp, unsigned short value);
0053 static void m147lance_writerdp(struct lance_private *lp, unsigned short value);
0054 static unsigned short m147lance_readrdp(struct lance_private *lp);
0055 
0056 typedef void (*writerap_t)(void *, unsigned short);
0057 typedef void (*writerdp_t)(void *, unsigned short);
0058 typedef unsigned short (*readrdp_t)(void *);
0059 
0060 static const struct net_device_ops lance_netdev_ops = {
0061     .ndo_open       = m147lance_open,
0062     .ndo_stop       = m147lance_close,
0063     .ndo_start_xmit     = lance_start_xmit,
0064     .ndo_set_rx_mode    = lance_set_multicast,
0065     .ndo_tx_timeout     = lance_tx_timeout,
0066     .ndo_validate_addr  = eth_validate_addr,
0067     .ndo_set_mac_address    = eth_mac_addr,
0068 };
0069 
0070 /* Initialise the one and only on-board 7990 */
0071 static struct net_device * __init mvme147lance_probe(void)
0072 {
0073     struct net_device *dev;
0074     static int called;
0075     static const char name[] = "MVME147 LANCE";
0076     struct m147lance_private *lp;
0077     u8 macaddr[ETH_ALEN];
0078     u_long *addr;
0079     u_long address;
0080     int err;
0081 
0082     if (!MACH_IS_MVME147 || called)
0083         return ERR_PTR(-ENODEV);
0084     called++;
0085 
0086     dev = alloc_etherdev(sizeof(struct m147lance_private));
0087     if (!dev)
0088         return ERR_PTR(-ENOMEM);
0089 
0090     /* Fill the dev fields */
0091     dev->base_addr = (unsigned long)MVME147_LANCE_BASE;
0092     dev->netdev_ops = &lance_netdev_ops;
0093     dev->dma = 0;
0094 
0095     addr = (u_long *)ETHERNET_ADDRESS;
0096     address = *addr;
0097     macaddr[0] = 0x08;
0098     macaddr[1] = 0x00;
0099     macaddr[2] = 0x3e;
0100     address = address >> 8;
0101     macaddr[5] = address&0xff;
0102     address = address >> 8;
0103     macaddr[4] = address&0xff;
0104     address = address >> 8;
0105     macaddr[3] = address&0xff;
0106     eth_hw_addr_set(dev, macaddr);
0107 
0108     printk("%s: MVME147 at 0x%08lx, irq %d, Hardware Address %pM\n",
0109            dev->name, dev->base_addr, MVME147_LANCE_IRQ,
0110            dev->dev_addr);
0111 
0112     lp = netdev_priv(dev);
0113     lp->ram = __get_dma_pages(GFP_ATOMIC, 3);   /* 32K */
0114     if (!lp->ram) {
0115         printk("%s: No memory for LANCE buffers\n", dev->name);
0116         free_netdev(dev);
0117         return ERR_PTR(-ENOMEM);
0118     }
0119 
0120     lp->lance.name = name;
0121     lp->lance.base = dev->base_addr;
0122     lp->lance.init_block = (struct lance_init_block *)(lp->ram); /* CPU addr */
0123     lp->lance.lance_init_block = (struct lance_init_block *)(lp->ram);                 /* LANCE addr of same RAM */
0124     lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
0125     lp->lance.irq = MVME147_LANCE_IRQ;
0126     lp->lance.writerap = (writerap_t)m147lance_writerap;
0127     lp->lance.writerdp = (writerdp_t)m147lance_writerdp;
0128     lp->lance.readrdp = (readrdp_t)m147lance_readrdp;
0129     lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
0130     lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
0131     lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
0132     lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
0133 
0134     err = register_netdev(dev);
0135     if (err) {
0136         free_pages(lp->ram, 3);
0137         free_netdev(dev);
0138         return ERR_PTR(err);
0139     }
0140 
0141     return dev;
0142 }
0143 
0144 static void m147lance_writerap(struct lance_private *lp, unsigned short value)
0145 {
0146     out_be16(lp->base + LANCE_RAP, value);
0147 }
0148 
0149 static void m147lance_writerdp(struct lance_private *lp, unsigned short value)
0150 {
0151     out_be16(lp->base + LANCE_RDP, value);
0152 }
0153 
0154 static unsigned short m147lance_readrdp(struct lance_private *lp)
0155 {
0156     return in_be16(lp->base + LANCE_RDP);
0157 }
0158 
0159 static int m147lance_open(struct net_device *dev)
0160 {
0161     int status;
0162 
0163     status = lance_open(dev);                 /* call generic lance open code */
0164     if (status)
0165         return status;
0166     /* enable interrupts at board level. */
0167     m147_pcc->lan_cntrl = 0;       /* clear the interrupts (if any) */
0168     m147_pcc->lan_cntrl = 0x08 | 0x04;     /* Enable irq 4 */
0169 
0170     return 0;
0171 }
0172 
0173 static int m147lance_close(struct net_device *dev)
0174 {
0175     /* disable interrupts at boardlevel */
0176     m147_pcc->lan_cntrl = 0x0; /* disable interrupts */
0177     lance_close(dev);
0178     return 0;
0179 }
0180 
0181 MODULE_LICENSE("GPL");
0182 
0183 static struct net_device *dev_mvme147_lance;
0184 static int __init m147lance_init(void)
0185 {
0186     dev_mvme147_lance = mvme147lance_probe();
0187     return PTR_ERR_OR_ZERO(dev_mvme147_lance);
0188 }
0189 module_init(m147lance_init);
0190 
0191 static void __exit m147lance_exit(void)
0192 {
0193     struct m147lance_private *lp = netdev_priv(dev_mvme147_lance);
0194     unregister_netdev(dev_mvme147_lance);
0195     free_pages(lp->ram, 3);
0196     free_netdev(dev_mvme147_lance);
0197 }
0198 module_exit(m147lance_exit);
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