root / hw / smc91c111.c @ dc828ca1
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/*
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* SMSC 91C111 Ethernet interface emulation
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*
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* Copyright (c) 2005 CodeSourcery, LLC.
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* Written by Paul Brook
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*
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* This code is licenced under the GPL
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*/
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|
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#include "hw.h" |
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#include "net.h" |
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#include "devices.h" |
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/* For crc32 */
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#include <zlib.h> |
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|
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/* Number of 2k memory pages available. */
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#define NUM_PACKETS 4 |
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|
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typedef struct { |
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VLANClientState *vc; |
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uint16_t tcr; |
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uint16_t rcr; |
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uint16_t cr; |
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uint16_t ctr; |
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uint16_t gpr; |
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uint16_t ptr; |
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uint16_t ercv; |
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qemu_irq irq; |
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int bank;
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int packet_num;
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int tx_alloc;
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/* Bitmask of allocated packets. */
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int allocated;
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int tx_fifo_len;
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int tx_fifo[NUM_PACKETS];
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int rx_fifo_len;
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int rx_fifo[NUM_PACKETS];
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int tx_fifo_done_len;
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int tx_fifo_done[NUM_PACKETS];
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/* Packet buffer memory. */
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uint8_t data[NUM_PACKETS][2048];
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uint8_t int_level; |
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uint8_t int_mask; |
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uint8_t macaddr[6];
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} smc91c111_state; |
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|
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#define RCR_SOFT_RST 0x8000 |
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#define RCR_STRIP_CRC 0x0200 |
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#define RCR_RXEN 0x0100 |
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|
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#define TCR_EPH_LOOP 0x2000 |
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#define TCR_NOCRC 0x0100 |
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#define TCR_PAD_EN 0x0080 |
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#define TCR_FORCOL 0x0004 |
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#define TCR_LOOP 0x0002 |
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#define TCR_TXEN 0x0001 |
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|
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#define INT_MD 0x80 |
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#define INT_ERCV 0x40 |
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#define INT_EPH 0x20 |
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#define INT_RX_OVRN 0x10 |
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#define INT_ALLOC 0x08 |
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#define INT_TX_EMPTY 0x04 |
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#define INT_TX 0x02 |
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#define INT_RCV 0x01 |
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|
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#define CTR_AUTO_RELEASE 0x0800 |
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#define CTR_RELOAD 0x0002 |
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#define CTR_STORE 0x0001 |
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|
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#define RS_ALGNERR 0x8000 |
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#define RS_BRODCAST 0x4000 |
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#define RS_BADCRC 0x2000 |
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#define RS_ODDFRAME 0x1000 |
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#define RS_TOOLONG 0x0800 |
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#define RS_TOOSHORT 0x0400 |
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#define RS_MULTICAST 0x0001 |
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|
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/* Update interrupt status. */
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static void smc91c111_update(smc91c111_state *s) |
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{ |
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int level;
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|
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if (s->tx_fifo_len == 0) |
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s->int_level |= INT_TX_EMPTY; |
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if (s->tx_fifo_done_len != 0) |
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s->int_level |= INT_TX; |
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level = (s->int_level & s->int_mask) != 0;
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qemu_set_irq(s->irq, level); |
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} |
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|
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/* Try to allocate a packet. Returns 0x80 on failure. */
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static int smc91c111_allocate_packet(smc91c111_state *s) |
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{ |
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int i;
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if (s->allocated == (1 << NUM_PACKETS) - 1) { |
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return 0x80; |
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} |
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|
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for (i = 0; i < NUM_PACKETS; i++) { |
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if ((s->allocated & (1 << i)) == 0) |
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break;
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} |
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s->allocated |= 1 << i;
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return i;
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} |
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|
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/* Process a pending TX allocate. */
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static void smc91c111_tx_alloc(smc91c111_state *s) |
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{ |
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s->tx_alloc = smc91c111_allocate_packet(s); |
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if (s->tx_alloc == 0x80) |
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return;
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s->int_level |= INT_ALLOC; |
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smc91c111_update(s); |
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} |
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|
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/* Remove and item from the RX FIFO. */
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static void smc91c111_pop_rx_fifo(smc91c111_state *s) |
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{ |
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int i;
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|
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s->rx_fifo_len--; |
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if (s->rx_fifo_len) {
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for (i = 0; i < s->rx_fifo_len; i++) |
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s->rx_fifo[i] = s->rx_fifo[i + 1];
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s->int_level |= INT_RCV; |
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} else {
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s->int_level &= ~INT_RCV; |
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} |
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smc91c111_update(s); |
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} |
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|
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/* Remove an item from the TX completion FIFO. */
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static void smc91c111_pop_tx_fifo_done(smc91c111_state *s) |
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{ |
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int i;
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if (s->tx_fifo_done_len == 0) |
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return;
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s->tx_fifo_done_len--; |
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for (i = 0; i < s->tx_fifo_done_len; i++) |
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s->tx_fifo_done[i] = s->tx_fifo_done[i + 1];
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} |
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|
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/* Release the memory allocated to a packet. */
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static void smc91c111_release_packet(smc91c111_state *s, int packet) |
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{ |
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s->allocated &= ~(1 << packet);
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if (s->tx_alloc == 0x80) |
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smc91c111_tx_alloc(s); |
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} |
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|
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/* Flush the TX FIFO. */
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static void smc91c111_do_tx(smc91c111_state *s) |
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{ |
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int i;
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int len;
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int control;
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int add_crc;
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int packetnum;
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uint8_t *p; |
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if ((s->tcr & TCR_TXEN) == 0) |
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return;
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if (s->tx_fifo_len == 0) |
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return;
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for (i = 0; i < s->tx_fifo_len; i++) { |
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packetnum = s->tx_fifo[i]; |
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p = &s->data[packetnum][0];
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/* Set status word. */
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*(p++) = 0x01;
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*(p++) = 0x40;
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len = *(p++); |
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len |= ((int)*(p++)) << 8; |
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len -= 6;
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control = p[len + 1];
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if (control & 0x20) |
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len++; |
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/* ??? This overwrites the data following the buffer.
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Don't know what real hardware does. */
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if (len < 64 && (s->tcr & TCR_PAD_EN)) { |
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memset(p + len, 0, 64 - len); |
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len = 64;
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} |
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#if 0
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/* The card is supposed to append the CRC to the frame. However
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none of the other network traffic has the CRC appended.
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Suspect this is low level ethernet detail we don't need to worry
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about. */
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add_crc = (control & 0x10) || (s->tcr & TCR_NOCRC) == 0;
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if (add_crc) {
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uint32_t crc;
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crc = crc32(~0, p, len);
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memcpy(p + len, &crc, 4);
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len += 4;
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}
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#else
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add_crc = 0;
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#endif
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if (s->ctr & CTR_AUTO_RELEASE)
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/* Race? */
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smc91c111_release_packet(s, packetnum); |
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else if (s->tx_fifo_done_len < NUM_PACKETS) |
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s->tx_fifo_done[s->tx_fifo_done_len++] = packetnum; |
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qemu_send_packet(s->vc, p, len); |
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} |
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s->tx_fifo_len = 0;
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smc91c111_update(s); |
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} |
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/* Add a packet to the TX FIFO. */
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static void smc91c111_queue_tx(smc91c111_state *s, int packet) |
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{ |
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if (s->tx_fifo_len == NUM_PACKETS)
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return;
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s->tx_fifo[s->tx_fifo_len++] = packet; |
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smc91c111_do_tx(s); |
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} |
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static void smc91c111_reset(smc91c111_state *s) |
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{ |
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s->bank = 0;
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s->tx_fifo_len = 0;
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s->tx_fifo_done_len = 0;
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s->rx_fifo_len = 0;
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s->allocated = 0;
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s->packet_num = 0;
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s->tx_alloc = 0;
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s->tcr = 0;
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s->rcr = 0;
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s->cr = 0xa0b1;
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s->ctr = 0x1210;
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s->ptr = 0;
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s->ercv = 0x1f;
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s->int_level = INT_TX_EMPTY; |
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s->int_mask = 0;
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smc91c111_update(s); |
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} |
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|
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#define SET_LOW(name, val) s->name = (s->name & 0xff00) | val |
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#define SET_HIGH(name, val) s->name = (s->name & 0xff) | (val << 8) |
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|
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static void smc91c111_writeb(void *opaque, target_phys_addr_t offset, |
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uint32_t value) |
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{ |
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smc91c111_state *s = (smc91c111_state *)opaque; |
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if (offset == 14) { |
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s->bank = value; |
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return;
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} |
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if (offset == 15) |
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return;
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switch (s->bank) {
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case 0: |
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switch (offset) {
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case 0: /* TCR */ |
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SET_LOW(tcr, value); |
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return;
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case 1: |
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SET_HIGH(tcr, value); |
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return;
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case 4: /* RCR */ |
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SET_LOW(rcr, value); |
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return;
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case 5: |
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SET_HIGH(rcr, value); |
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if (s->rcr & RCR_SOFT_RST)
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smc91c111_reset(s); |
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return;
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case 10: case 11: /* RPCR */ |
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/* Ignored */
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return;
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} |
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break;
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case 1: |
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switch (offset) {
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case 0: /* CONFIG */ |
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SET_LOW(cr, value); |
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return;
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case 1: |
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SET_HIGH(cr,value); |
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return;
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case 2: case 3: /* BASE */ |
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case 4: case 5: case 6: case 7: case 8: case 9: /* IA */ |
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/* Not implemented. */
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return;
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case 10: /* Genral Purpose */ |
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SET_LOW(gpr, value); |
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return;
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case 11: |
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SET_HIGH(gpr, value); |
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return;
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case 12: /* Control */ |
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if (value & 1) |
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fprintf(stderr, "smc91c111:EEPROM store not implemented\n");
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if (value & 2) |
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fprintf(stderr, "smc91c111:EEPROM reload not implemented\n");
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value &= ~3;
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SET_LOW(ctr, value); |
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return;
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case 13: |
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SET_HIGH(ctr, value); |
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return;
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} |
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break;
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|
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case 2: |
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switch (offset) {
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case 0: /* MMU Command */ |
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switch (value >> 5) { |
316 |
case 0: /* no-op */ |
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break;
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case 1: /* Allocate for TX. */ |
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s->tx_alloc = 0x80;
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s->int_level &= ~INT_ALLOC; |
321 |
smc91c111_update(s); |
322 |
smc91c111_tx_alloc(s); |
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break;
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case 2: /* Reset MMU. */ |
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s->allocated = 0;
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s->tx_fifo_len = 0;
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s->tx_fifo_done_len = 0;
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s->rx_fifo_len = 0;
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s->tx_alloc = 0;
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break;
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case 3: /* Remove from RX FIFO. */ |
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smc91c111_pop_rx_fifo(s); |
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break;
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case 4: /* Remove from RX FIFO and release. */ |
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if (s->rx_fifo_len > 0) { |
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smc91c111_release_packet(s, s->rx_fifo[0]);
|
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} |
338 |
smc91c111_pop_rx_fifo(s); |
339 |
break;
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case 5: /* Release. */ |
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smc91c111_release_packet(s, s->packet_num); |
342 |
break;
|
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case 6: /* Add to TX FIFO. */ |
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smc91c111_queue_tx(s, s->packet_num); |
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break;
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case 7: /* Reset TX FIFO. */ |
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s->tx_fifo_len = 0;
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s->tx_fifo_done_len = 0;
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break;
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} |
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return;
|
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case 1: |
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/* Ignore. */
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return;
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case 2: /* Packet Number Register */ |
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s->packet_num = value; |
357 |
return;
|
358 |
case 3: case 4: case 5: |
359 |
/* Should be readonly, but linux writes to them anyway. Ignore. */
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return;
|
361 |
case 6: /* Pointer */ |
362 |
SET_LOW(ptr, value); |
363 |
return;
|
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case 7: |
365 |
SET_HIGH(ptr, value); |
366 |
return;
|
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case 8: case 9: case 10: case 11: /* Data */ |
368 |
{ |
369 |
int p;
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370 |
int n;
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371 |
|
372 |
if (s->ptr & 0x8000) |
373 |
n = s->rx_fifo[0];
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else
|
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n = s->packet_num; |
376 |
p = s->ptr & 0x07ff;
|
377 |
if (s->ptr & 0x4000) { |
378 |
s->ptr = (s->ptr & 0xf800) | ((s->ptr + 1) & 0x7ff); |
379 |
} else {
|
380 |
p += (offset & 3);
|
381 |
} |
382 |
s->data[n][p] = value; |
383 |
} |
384 |
return;
|
385 |
case 12: /* Interrupt ACK. */ |
386 |
s->int_level &= ~(value & 0xd6);
|
387 |
if (value & INT_TX)
|
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smc91c111_pop_tx_fifo_done(s); |
389 |
smc91c111_update(s); |
390 |
return;
|
391 |
case 13: /* Interrupt mask. */ |
392 |
s->int_mask = value; |
393 |
smc91c111_update(s); |
394 |
return;
|
395 |
} |
396 |
break;;
|
397 |
|
398 |
case 3: |
399 |
switch (offset) {
|
400 |
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: |
401 |
/* Multicast table. */
|
402 |
/* Not implemented. */
|
403 |
return;
|
404 |
case 8: case 9: /* Management Interface. */ |
405 |
/* Not implemented. */
|
406 |
return;
|
407 |
case 12: /* Early receive. */ |
408 |
s->ercv = value & 0x1f;
|
409 |
case 13: |
410 |
/* Ignore. */
|
411 |
return;
|
412 |
} |
413 |
break;
|
414 |
} |
415 |
cpu_abort (cpu_single_env, "smc91c111_write: Bad reg %d:%x\n",
|
416 |
s->bank, (int)offset);
|
417 |
} |
418 |
|
419 |
static uint32_t smc91c111_readb(void *opaque, target_phys_addr_t offset) |
420 |
{ |
421 |
smc91c111_state *s = (smc91c111_state *)opaque; |
422 |
|
423 |
if (offset == 14) { |
424 |
return s->bank;
|
425 |
} |
426 |
if (offset == 15) |
427 |
return 0x33; |
428 |
switch (s->bank) {
|
429 |
case 0: |
430 |
switch (offset) {
|
431 |
case 0: /* TCR */ |
432 |
return s->tcr & 0xff; |
433 |
case 1: |
434 |
return s->tcr >> 8; |
435 |
case 2: /* EPH Status */ |
436 |
return 0; |
437 |
case 3: |
438 |
return 0x40; |
439 |
case 4: /* RCR */ |
440 |
return s->rcr & 0xff; |
441 |
case 5: |
442 |
return s->rcr >> 8; |
443 |
case 6: /* Counter */ |
444 |
case 7: |
445 |
/* Not implemented. */
|
446 |
return 0; |
447 |
case 8: /* Memory size. */ |
448 |
return NUM_PACKETS;
|
449 |
case 9: /* Free memory available. */ |
450 |
{ |
451 |
int i;
|
452 |
int n;
|
453 |
n = 0;
|
454 |
for (i = 0; i < NUM_PACKETS; i++) { |
455 |
if (s->allocated & (1 << i)) |
456 |
n++; |
457 |
} |
458 |
return n;
|
459 |
} |
460 |
case 10: case 11: /* RPCR */ |
461 |
/* Not implemented. */
|
462 |
return 0; |
463 |
} |
464 |
break;
|
465 |
|
466 |
case 1: |
467 |
switch (offset) {
|
468 |
case 0: /* CONFIG */ |
469 |
return s->cr & 0xff; |
470 |
case 1: |
471 |
return s->cr >> 8; |
472 |
case 2: case 3: /* BASE */ |
473 |
/* Not implemented. */
|
474 |
return 0; |
475 |
case 4: case 5: case 6: case 7: case 8: case 9: /* IA */ |
476 |
return s->macaddr[offset - 4]; |
477 |
case 10: /* General Purpose */ |
478 |
return s->gpr & 0xff; |
479 |
case 11: |
480 |
return s->gpr >> 8; |
481 |
case 12: /* Control */ |
482 |
return s->ctr & 0xff; |
483 |
case 13: |
484 |
return s->ctr >> 8; |
485 |
} |
486 |
break;
|
487 |
|
488 |
case 2: |
489 |
switch (offset) {
|
490 |
case 0: case 1: /* MMUCR Busy bit. */ |
491 |
return 0; |
492 |
case 2: /* Packet Number. */ |
493 |
return s->packet_num;
|
494 |
case 3: /* Allocation Result. */ |
495 |
return s->tx_alloc;
|
496 |
case 4: /* TX FIFO */ |
497 |
if (s->tx_fifo_done_len == 0) |
498 |
return 0x80; |
499 |
else
|
500 |
return s->tx_fifo_done[0]; |
501 |
case 5: /* RX FIFO */ |
502 |
if (s->rx_fifo_len == 0) |
503 |
return 0x80; |
504 |
else
|
505 |
return s->rx_fifo[0]; |
506 |
case 6: /* Pointer */ |
507 |
return s->ptr & 0xff; |
508 |
case 7: |
509 |
return (s->ptr >> 8) & 0xf7; |
510 |
case 8: case 9: case 10: case 11: /* Data */ |
511 |
{ |
512 |
int p;
|
513 |
int n;
|
514 |
|
515 |
if (s->ptr & 0x8000) |
516 |
n = s->rx_fifo[0];
|
517 |
else
|
518 |
n = s->packet_num; |
519 |
p = s->ptr & 0x07ff;
|
520 |
if (s->ptr & 0x4000) { |
521 |
s->ptr = (s->ptr & 0xf800) | ((s->ptr + 1) & 0x07ff); |
522 |
} else {
|
523 |
p += (offset & 3);
|
524 |
} |
525 |
return s->data[n][p];
|
526 |
} |
527 |
case 12: /* Interrupt status. */ |
528 |
return s->int_level;
|
529 |
case 13: /* Interrupt mask. */ |
530 |
return s->int_mask;
|
531 |
} |
532 |
break;
|
533 |
|
534 |
case 3: |
535 |
switch (offset) {
|
536 |
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: |
537 |
/* Multicast table. */
|
538 |
/* Not implemented. */
|
539 |
return 0; |
540 |
case 8: /* Management Interface. */ |
541 |
/* Not implemented. */
|
542 |
return 0x30; |
543 |
case 9: |
544 |
return 0x33; |
545 |
case 10: /* Revision. */ |
546 |
return 0x91; |
547 |
case 11: |
548 |
return 0x33; |
549 |
case 12: |
550 |
return s->ercv;
|
551 |
case 13: |
552 |
return 0; |
553 |
} |
554 |
break;
|
555 |
} |
556 |
cpu_abort (cpu_single_env, "smc91c111_read: Bad reg %d:%x\n",
|
557 |
s->bank, (int)offset);
|
558 |
return 0; |
559 |
} |
560 |
|
561 |
static void smc91c111_writew(void *opaque, target_phys_addr_t offset, |
562 |
uint32_t value) |
563 |
{ |
564 |
smc91c111_writeb(opaque, offset, value & 0xff);
|
565 |
smc91c111_writeb(opaque, offset + 1, value >> 8); |
566 |
} |
567 |
|
568 |
static void smc91c111_writel(void *opaque, target_phys_addr_t offset, |
569 |
uint32_t value) |
570 |
{ |
571 |
/* 32-bit writes to offset 0xc only actually write to the bank select
|
572 |
register (offset 0xe) */
|
573 |
if (offset != 0xc) |
574 |
smc91c111_writew(opaque, offset, value & 0xffff);
|
575 |
smc91c111_writew(opaque, offset + 2, value >> 16); |
576 |
} |
577 |
|
578 |
static uint32_t smc91c111_readw(void *opaque, target_phys_addr_t offset) |
579 |
{ |
580 |
uint32_t val; |
581 |
val = smc91c111_readb(opaque, offset); |
582 |
val |= smc91c111_readb(opaque, offset + 1) << 8; |
583 |
return val;
|
584 |
} |
585 |
|
586 |
static uint32_t smc91c111_readl(void *opaque, target_phys_addr_t offset) |
587 |
{ |
588 |
uint32_t val; |
589 |
val = smc91c111_readw(opaque, offset); |
590 |
val |= smc91c111_readw(opaque, offset + 2) << 16; |
591 |
return val;
|
592 |
} |
593 |
|
594 |
static int smc91c111_can_receive(void *opaque) |
595 |
{ |
596 |
smc91c111_state *s = (smc91c111_state *)opaque; |
597 |
|
598 |
if ((s->rcr & RCR_RXEN) == 0 || (s->rcr & RCR_SOFT_RST)) |
599 |
return 1; |
600 |
if (s->allocated == (1 << NUM_PACKETS) - 1) |
601 |
return 0; |
602 |
return 1; |
603 |
} |
604 |
|
605 |
static void smc91c111_receive(void *opaque, const uint8_t *buf, int size) |
606 |
{ |
607 |
smc91c111_state *s = (smc91c111_state *)opaque; |
608 |
int status;
|
609 |
int packetsize;
|
610 |
uint32_t crc; |
611 |
int packetnum;
|
612 |
uint8_t *p; |
613 |
|
614 |
if ((s->rcr & RCR_RXEN) == 0 || (s->rcr & RCR_SOFT_RST)) |
615 |
return;
|
616 |
/* Short packets are padded with zeros. Receiving a packet
|
617 |
< 64 bytes long is considered an error condition. */
|
618 |
if (size < 64) |
619 |
packetsize = 64;
|
620 |
else
|
621 |
packetsize = (size & ~1);
|
622 |
packetsize += 6;
|
623 |
crc = (s->rcr & RCR_STRIP_CRC) == 0;
|
624 |
if (crc)
|
625 |
packetsize += 4;
|
626 |
/* TODO: Flag overrun and receive errors. */
|
627 |
if (packetsize > 2048) |
628 |
return;
|
629 |
packetnum = smc91c111_allocate_packet(s); |
630 |
if (packetnum == 0x80) |
631 |
return;
|
632 |
s->rx_fifo[s->rx_fifo_len++] = packetnum; |
633 |
|
634 |
p = &s->data[packetnum][0];
|
635 |
/* ??? Multicast packets? */
|
636 |
status = 0;
|
637 |
if (size > 1518) |
638 |
status |= RS_TOOLONG; |
639 |
if (size & 1) |
640 |
status |= RS_ODDFRAME; |
641 |
*(p++) = status & 0xff;
|
642 |
*(p++) = status >> 8;
|
643 |
*(p++) = packetsize & 0xff;
|
644 |
*(p++) = packetsize >> 8;
|
645 |
memcpy(p, buf, size & ~1);
|
646 |
p += (size & ~1);
|
647 |
/* Pad short packets. */
|
648 |
if (size < 64) { |
649 |
int pad;
|
650 |
|
651 |
if (size & 1) |
652 |
*(p++) = buf[size - 1];
|
653 |
pad = 64 - size;
|
654 |
memset(p, 0, pad);
|
655 |
p += pad; |
656 |
size = 64;
|
657 |
} |
658 |
/* It's not clear if the CRC should go before or after the last byte in
|
659 |
odd sized packets. Linux disables the CRC, so that's no help.
|
660 |
The pictures in the documentation show the CRC aligned on a 16-bit
|
661 |
boundary before the last odd byte, so that's what we do. */
|
662 |
if (crc) {
|
663 |
crc = crc32(~0, buf, size);
|
664 |
*(p++) = crc & 0xff; crc >>= 8; |
665 |
*(p++) = crc & 0xff; crc >>= 8; |
666 |
*(p++) = crc & 0xff; crc >>= 8; |
667 |
*(p++) = crc & 0xff; crc >>= 8; |
668 |
} |
669 |
if (size & 1) { |
670 |
*(p++) = buf[size - 1];
|
671 |
*(p++) = 0x60;
|
672 |
} else {
|
673 |
*(p++) = 0;
|
674 |
*(p++) = 0x40;
|
675 |
} |
676 |
/* TODO: Raise early RX interrupt? */
|
677 |
s->int_level |= INT_RCV; |
678 |
smc91c111_update(s); |
679 |
} |
680 |
|
681 |
static CPUReadMemoryFunc *smc91c111_readfn[] = {
|
682 |
smc91c111_readb, |
683 |
smc91c111_readw, |
684 |
smc91c111_readl |
685 |
}; |
686 |
|
687 |
static CPUWriteMemoryFunc *smc91c111_writefn[] = {
|
688 |
smc91c111_writeb, |
689 |
smc91c111_writew, |
690 |
smc91c111_writel |
691 |
}; |
692 |
|
693 |
void smc91c111_init(NICInfo *nd, uint32_t base, qemu_irq irq)
|
694 |
{ |
695 |
smc91c111_state *s; |
696 |
int iomemtype;
|
697 |
|
698 |
qemu_check_nic_model(nd, "smc91c111");
|
699 |
|
700 |
s = (smc91c111_state *)qemu_mallocz(sizeof(smc91c111_state));
|
701 |
iomemtype = cpu_register_io_memory(0, smc91c111_readfn,
|
702 |
smc91c111_writefn, s); |
703 |
cpu_register_physical_memory(base, 16, iomemtype);
|
704 |
s->irq = irq; |
705 |
memcpy(s->macaddr, nd->macaddr, 6);
|
706 |
|
707 |
smc91c111_reset(s); |
708 |
|
709 |
s->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name, |
710 |
smc91c111_receive, smc91c111_can_receive, s); |
711 |
qemu_format_nic_info_str(s->vc, s->macaddr); |
712 |
/* ??? Save/restore. */
|
713 |
} |