/* stnic.c : A SH7750 specific part of driver for NS DP83902A ST-NIC. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1999 kaz Kojima */ #include #include #include #include #include #include #include #include #include #include #include #include #include "8390.h" #define byte unsigned char #define half unsigned short #define word unsigned int #define vbyte volatile unsigned char #define vhalf volatile unsigned short #define vword volatile unsigned int #define STNIC_RUN 0x01 /* 1 == Run, 0 == reset. */ #define START_PG 0 /* First page of TX buffer */ #define STOP_PG 128 /* Last page +1 of RX ring */ /* Alias */ #define STNIC_CR E8390_CMD #define PG0_RSAR0 EN0_RSARLO #define PG0_RSAR1 EN0_RSARHI #define PG0_RBCR0 EN0_RCNTLO #define PG0_RBCR1 EN0_RCNTHI #define CR_RRD E8390_RREAD #define CR_RWR E8390_RWRITE #define CR_PG0 E8390_PAGE0 #define CR_STA E8390_START #define CR_RDMA E8390_NODMA /* FIXME! YOU MUST SET YOUR OWN ETHER ADDRESS. */ static byte stnic_eadr[6] = {0x00, 0xc0, 0x6e, 0x00, 0x00, 0x07}; static struct net_device *stnic_dev; static int stnic_open (struct net_device *dev); static int stnic_close (struct net_device *dev); static void stnic_reset (struct net_device *dev); static void stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page); static void stnic_block_input (struct net_device *dev, int count, struct sk_buff *skb , int ring_offset); static void stnic_block_output (struct net_device *dev, int count, const unsigned char *buf, int start_page); static void stnic_init (struct net_device *dev); /* SH7750 specific read/write io. */ static inline void STNIC_DELAY (void) { vword trash; trash = *(vword *) 0xa0000000; trash = *(vword *) 0xa0000000; } static inline byte STNIC_READ (int reg) { byte val; val = (*(vhalf *) (PA_83902 + ((reg) << 1)) >> 8) & 0xff; STNIC_DELAY (); return val; } static inline void STNIC_WRITE (int reg, byte val) { *(vhalf *) (PA_83902 + ((reg) << 1)) = ((half) (val) << 8); STNIC_DELAY (); } int __init stnic_probe(void) { struct net_device tmp, *dev = NULL; int i; tmp.base_addr = 0x1000; dev = &tmp; if (load_8390_module ("stnic.c")) return -ENOSYS; /* New style probing API */ dev = init_etherdev (0, 0); stnic_dev = dev; /* Allocate dev->priv and fill in 8390 specific dev fields. */ if (ethdev_init (dev)) { printk ("Unable to get memory for dev->priv.\n"); return -ENOMEM; } for (i = 0; i < ETHER_ADDR_LEN; i++) dev->dev_addr[i] = stnic_eadr[i]; /* Set the base address to point to the NIC, not the "real" base! */ dev->base_addr = 0x1000; dev->irq = IRQ_STNIC; dev->open = &stnic_open; dev->stop = &stnic_close; /* Snarf the interrupt now. There's no point in waiting since we cannot share and the board will usually be enabled. */ if (request_irq (dev->irq, ei_interrupt, 0, "DP83902A", dev)) { printk (" unable to get IRQ %d.\n", dev->irq); kfree(dev->priv); dev->priv = NULL; return -EAGAIN; } ei_status.name = "eth0"; ei_status.word16 = 1; ei_status.tx_start_page = START_PG; ei_status.rx_start_page = START_PG + TX_PAGES; ei_status.stop_page = STOP_PG; ei_status.reset_8390 = &stnic_reset; ei_status.get_8390_hdr = &stnic_get_hdr; ei_status.block_input = &stnic_block_input; ei_status.block_output = &stnic_block_output; stnic_init (dev); printk (KERN_INFO "NS ST-NIC 83902A\n"); return 0; } static int stnic_open (struct net_device *dev) { #if 0 printk ("stnic open\n"); #endif ei_open (dev); MOD_INC_USE_COUNT; return 0; } static int stnic_close (struct net_device *dev) { ei_close (dev); MOD_DEC_USE_COUNT; return 0; } static void stnic_reset (struct net_device *dev) { *(vhalf *) PA_83902_RST = 0; udelay (5); if (ei_debug > 1) printk("8390 reset done (%ld).\n", jiffies); *(vhalf *) PA_83902_RST = ~0; udelay (5); } static void stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page) { half buf[2]; STNIC_WRITE (PG0_RSAR0, 0); STNIC_WRITE (PG0_RSAR1, ring_page); STNIC_WRITE (PG0_RBCR0, 4); STNIC_WRITE (PG0_RBCR1, 0); STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA); buf[0] = *(vhalf *) PA_83902_IF; STNIC_DELAY (); buf[1] = *(vhalf *) PA_83902_IF; STNIC_DELAY (); hdr->next = buf[0] >> 8; hdr->status = buf[0] & 0xff; #ifdef __LITTLE_ENDIAN__ hdr->count = buf[1]; #else hdr->count = ((buf[1] >> 8) & 0xff) | (buf[1] << 8); #endif if (ei_debug > 1) printk ("ring %x status %02x next %02x count %04x.\n", ring_page, hdr->status, hdr->next, hdr->count); STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA); } /* Block input and output, similar to the Crynwr packet driver. If you are porting to a new ethercard look at the packet driver source for hints. The HP LAN doesn't use shared memory -- we put the packet out through the "remote DMA" dataport. */ static void stnic_block_input (struct net_device *dev, int length, struct sk_buff *skb, int offset) { char *buf = skb->data; half val; STNIC_WRITE (PG0_RSAR0, offset & 0xff); STNIC_WRITE (PG0_RSAR1, offset >> 8); STNIC_WRITE (PG0_RBCR0, length & 0xff); STNIC_WRITE (PG0_RBCR1, length >> 8); STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA); if (length & 1) length++; while (length > 0) { val = *(vhalf *) PA_83902_IF; #ifdef __LITTLE_ENDIAN__ *buf++ = val & 0xff; *buf++ = val >> 8; #else *buf++ = val >> 8; *buf++ = val & 0xff; #endif STNIC_DELAY (); length -= sizeof (half); } STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA); } static void stnic_block_output (struct net_device *dev, int length, const unsigned char *buf, int output_page) { #if 0 STNIC_WRITE (PG0_RBCR0, 1); STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA); #else /* XXX: I don't know why but this works. -- gniibe */ STNIC_WRITE (PG0_RBCR0, 0x42); STNIC_WRITE (PG0_RBCR1, 0x00); STNIC_WRITE (PG0_RBCR0, 0x42); STNIC_WRITE (PG0_RBCR1, 0x00); STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA); STNIC_DELAY (); #endif STNIC_WRITE (PG0_RSAR0, 0); STNIC_WRITE (PG0_RSAR1, output_page); STNIC_WRITE (PG0_RBCR0, length & 0xff); STNIC_WRITE (PG0_RBCR1, length >> 8); STNIC_WRITE (STNIC_CR, CR_RWR | CR_PG0 | CR_STA); if (length & 1) length++; while (length > 0) { #ifdef __LITTLE_ENDIAN__ *(vhalf *) PA_83902_IF = ((half) buf[1] << 8) | buf[0]; #else *(vhalf *) PA_83902_IF = ((half) buf[0] << 8) | buf[1]; #endif STNIC_DELAY (); buf += sizeof (half); length -= sizeof (half); } STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA); } /* This function resets the STNIC if something screws up. */ static void stnic_init (struct net_device *dev) { stnic_reset (dev); NS8390_init (dev, 0); return; } /* Hardware interrupt handler. */ extern void ei_interrupt (int irq, void *dev_id, struct pt_regs *regs); void do_stnic_intr (int irq, void *dev_id, struct pt_regs *regs) { ei_interrupt (0, stnic_dev, regs); } module_init(stnic_probe); /* No cleanup routine - if there were one, it should do a: unload_8390_module() */