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Diffstat (limited to 'drivers/net/enc28j60.c')
| -rw-r--r-- | drivers/net/enc28j60.c | 978 |
1 files changed, 978 insertions, 0 deletions
diff --git a/drivers/net/enc28j60.c b/drivers/net/enc28j60.c new file mode 100644 index 000000000..6c161b632 --- /dev/null +++ b/drivers/net/enc28j60.c @@ -0,0 +1,978 @@ +/* + * (C) Copyright 2010 + * Reinhard Meyer, EMK Elektronik, reinhard.meyer@emk-elektronik.de + * Martin Krause, Martin.Krause@tqs.de + * reworked original enc28j60.c + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <net.h> +#include <spi.h> +#include <malloc.h> +#include <netdev.h> +#include <miiphy.h> +#include "enc28j60.h" + +/* + * IMPORTANT: spi_claim_bus() and spi_release_bus() + * are called at begin and end of each of the following functions: + * enc_miiphy_read(), enc_miiphy_write(), enc_write_hwaddr(), + * enc_init(), enc_recv(), enc_send(), enc_halt() + * ALL other functions assume that the bus has already been claimed! + * Since NetReceive() might call enc_send() in return, the bus must be + * released, NetReceive() called and claimed again. + */ + +/* + * Controller memory layout. + * We only allow 1 frame for transmission and reserve the rest + * for reception to handle as many broadcast packets as possible. + * Also use the memory from 0x0000 for receiver buffer. See errata pt. 5 + * 0x0000 - 0x19ff 6656 bytes receive buffer + * 0x1a00 - 0x1fff 1536 bytes transmit buffer = + * control(1)+frame(1518)+status(7)+reserve(10). + */ +#define ENC_RX_BUF_START 0x0000 +#define ENC_RX_BUF_END 0x19ff +#define ENC_TX_BUF_START 0x1a00 +#define ENC_TX_BUF_END 0x1fff +#define ENC_MAX_FRM_LEN 1518 +#define RX_RESET_COUNTER 1000 + +/* + * For non data transfer functions, like phy read/write, set hwaddr, init + * we do not need a full, time consuming init including link ready wait. + * This enum helps to bring the chip through the minimum necessary inits. + */ +enum enc_initstate {none=0, setupdone, linkready}; +typedef struct enc_device { + struct eth_device *dev; /* back pointer */ + struct spi_slave *slave; + int rx_reset_counter; + u16 next_pointer; + u8 bank; /* current bank in enc28j60 */ + enum enc_initstate initstate; +} enc_dev_t; + +/* + * enc_bset: set bits in a common register + * enc_bclr: clear bits in a common register + * + * making the reg parameter u8 will give a compile time warning if the + * functions are called with a register not accessible in all Banks + */ +static void enc_bset(enc_dev_t *enc, const u8 reg, const u8 data) +{ + u8 dout[2]; + + dout[0] = CMD_BFS(reg); + dout[1] = data; + spi_xfer(enc->slave, 2 * 8, dout, NULL, + SPI_XFER_BEGIN | SPI_XFER_END); +} + +static void enc_bclr(enc_dev_t *enc, const u8 reg, const u8 data) +{ + u8 dout[2]; + + dout[0] = CMD_BFC(reg); + dout[1] = data; + spi_xfer(enc->slave, 2 * 8, dout, NULL, + SPI_XFER_BEGIN | SPI_XFER_END); +} + +/* + * high byte of the register contains bank number: + * 0: no bank switch necessary + * 1: switch to bank 0 + * 2: switch to bank 1 + * 3: switch to bank 2 + * 4: switch to bank 3 + */ +static void enc_set_bank(enc_dev_t *enc, const u16 reg) +{ + u8 newbank = reg >> 8; + + if (newbank == 0 || newbank == enc->bank) + return; + switch (newbank) { + case 1: + enc_bclr(enc, CTL_REG_ECON1, + ENC_ECON1_BSEL0 | ENC_ECON1_BSEL1); + break; + case 2: + enc_bset(enc, CTL_REG_ECON1, ENC_ECON1_BSEL0); + enc_bclr(enc, CTL_REG_ECON1, ENC_ECON1_BSEL1); + break; + case 3: + enc_bclr(enc, CTL_REG_ECON1, ENC_ECON1_BSEL0); + enc_bset(enc, CTL_REG_ECON1, ENC_ECON1_BSEL1); + break; + case 4: + enc_bset(enc, CTL_REG_ECON1, + ENC_ECON1_BSEL0 | ENC_ECON1_BSEL1); + break; + } + enc->bank = newbank; +} + +/* + * local functions to access SPI + * + * reg: register inside ENC28J60 + * data: 8/16 bits to write + * c: number of retries + * + * enc_r8: read 8 bits + * enc_r16: read 16 bits + * enc_w8: write 8 bits + * enc_w16: write 16 bits + * enc_w8_retry: write 8 bits, verify and retry + * enc_rbuf: read from ENC28J60 into buffer + * enc_wbuf: write from buffer into ENC28J60 + */ + +/* + * MAC and MII registers need a 3 byte SPI transfer to read, + * all other registers need a 2 byte SPI transfer. + */ +static int enc_reg2nbytes(const u16 reg) +{ + /* check if MAC or MII register */ + return ((reg >= CTL_REG_MACON1 && reg <= CTL_REG_MIRDH) || + (reg >= CTL_REG_MAADR1 && reg <= CTL_REG_MAADR4) || + (reg == CTL_REG_MISTAT)) ? 3 : 2; +} + +/* + * Read a byte register + */ +static u8 enc_r8(enc_dev_t *enc, const u16 reg) +{ + u8 dout[3]; + u8 din[3]; + int nbytes = enc_reg2nbytes(reg); + + enc_set_bank(enc, reg); + dout[0] = CMD_RCR(reg); + spi_xfer(enc->slave, nbytes * 8, dout, din, + SPI_XFER_BEGIN | SPI_XFER_END); + return din[nbytes-1]; +} + +/* + * Read a L/H register pair and return a word. + * Must be called with the L register's address. + */ +static u16 enc_r16(enc_dev_t *enc, const u16 reg) +{ + u8 dout[3]; + u8 din[3]; + u16 result; + int nbytes = enc_reg2nbytes(reg); + + enc_set_bank(enc, reg); + dout[0] = CMD_RCR(reg); + spi_xfer(enc->slave, nbytes * 8, dout, din, + SPI_XFER_BEGIN | SPI_XFER_END); + result = din[nbytes-1]; + dout[0]++; /* next register */ + spi_xfer(enc->slave, nbytes * 8, dout, din, + SPI_XFER_BEGIN | SPI_XFER_END); + result |= din[nbytes-1] << 8; + return result; +} + +/* + * Write a byte register + */ +static void enc_w8(enc_dev_t *enc, const u16 reg, const u8 data) +{ + u8 dout[2]; + + enc_set_bank(enc, reg); + dout[0] = CMD_WCR(reg); + dout[1] = data; + spi_xfer(enc->slave, 2 * 8, dout, NULL, + SPI_XFER_BEGIN | SPI_XFER_END); +} + +/* + * Write a L/H register pair. + * Must be called with the L register's address. + */ +static void enc_w16(enc_dev_t *enc, const u16 reg, const u16 data) +{ + u8 dout[2]; + + enc_set_bank(enc, reg); + dout[0] = CMD_WCR(reg); + dout[1] = data; + spi_xfer(enc->slave, 2 * 8, dout, NULL, + SPI_XFER_BEGIN | SPI_XFER_END); + dout[0]++; /* next register */ + dout[1] = data >> 8; + spi_xfer(enc->slave, 2 * 8, dout, NULL, + SPI_XFER_BEGIN | SPI_XFER_END); +} + +/* + * Write a byte register, verify and retry + */ +static void enc_w8_retry(enc_dev_t *enc, const u16 reg, const u8 data, const int c) +{ + u8 dout[2]; + u8 readback; + int i; + + enc_set_bank(enc, reg); + for (i = 0; i < c; i++) { + dout[0] = CMD_WCR(reg); + dout[1] = data; + spi_xfer(enc->slave, 2 * 8, dout, NULL, + SPI_XFER_BEGIN | SPI_XFER_END); + readback = enc_r8(enc, reg); + if (readback == data) + break; + /* wait 1ms */ + udelay(1000); + } + if (i == c) { + printf("%s: write reg 0x%03x failed\n", enc->dev->name, reg); + } +} + +/* + * Read ENC RAM into buffer + */ +static void enc_rbuf(enc_dev_t *enc, const u16 length, u8 *buf) +{ + u8 dout[1]; + + dout[0] = CMD_RBM; + spi_xfer(enc->slave, 8, dout, NULL, SPI_XFER_BEGIN); + spi_xfer(enc->slave, length * 8, NULL, buf, SPI_XFER_END); +#ifdef DEBUG + puts("Rx:\n"); + print_buffer(0, buf, 1, length, 0); +#endif +} + +/* + * Write buffer into ENC RAM + */ +static void enc_wbuf(enc_dev_t *enc, const u16 length, const u8 *buf, const u8 control) +{ + u8 dout[2]; + dout[0] = CMD_WBM; + dout[1] = control; + spi_xfer(enc->slave, 2 * 8, dout, NULL, SPI_XFER_BEGIN); + spi_xfer(enc->slave, length * 8, buf, NULL, SPI_XFER_END); +#ifdef DEBUG + puts("Tx:\n"); + print_buffer(0, buf, 1, length, 0); +#endif +} + +/* + * Try to claim the SPI bus. + * Print error message on failure. + */ +static int enc_claim_bus(enc_dev_t *enc) +{ + int rc = spi_claim_bus(enc->slave); + if (rc) + printf("%s: failed to claim SPI bus\n", enc->dev->name); + return rc; +} + +/* + * Release previously claimed SPI bus. + * This function is mainly for symmetry to enc_claim_bus(). + * Let the toolchain decide to inline it... + */ +static void enc_release_bus(enc_dev_t *enc) +{ + spi_release_bus(enc->slave); +} + +/* + * Read PHY register + */ +static u16 phy_read(enc_dev_t *enc, const u8 addr) +{ + uint64_t etime; + u8 status; + + enc_w8(enc, CTL_REG_MIREGADR, addr); + enc_w8(enc, CTL_REG_MICMD, ENC_MICMD_MIIRD); + /* 1 second timeout - only happens on hardware problem */ + etime = get_ticks() + get_tbclk(); + /* poll MISTAT.BUSY bit until operation is complete */ + do + { + status = enc_r8(enc, CTL_REG_MISTAT); + } while (get_ticks() <= etime && (status & ENC_MISTAT_BUSY)); + if (status & ENC_MISTAT_BUSY) { + printf("%s: timeout reading phy\n", enc->dev->name); + return 0; + } + enc_w8(enc, CTL_REG_MICMD, 0); + return enc_r16(enc, CTL_REG_MIRDL); +} + +/* + * Write PHY register + */ +static void phy_write(enc_dev_t *enc, const u8 addr, const u16 data) +{ + uint64_t etime; + u8 status; + + enc_w8(enc, CTL_REG_MIREGADR, addr); + enc_w16(enc, CTL_REG_MIWRL, data); + /* 1 second timeout - only happens on hardware problem */ + etime = get_ticks() + get_tbclk(); + /* poll MISTAT.BUSY bit until operation is complete */ + do + { + status = enc_r8(enc, CTL_REG_MISTAT); + } while (get_ticks() <= etime && (status & ENC_MISTAT_BUSY)); + if (status & ENC_MISTAT_BUSY) { + printf("%s: timeout writing phy\n", enc->dev->name); + return; + } +} + +/* + * Verify link status, wait if necessary + * + * Note: with a 10 MBit/s only PHY there is no autonegotiation possible, + * half/full duplex is a pure setup matter. For the time being, this driver + * will setup in half duplex mode only. + */ +static int enc_phy_link_wait(enc_dev_t *enc) +{ + u16 status; + int duplex; + uint64_t etime; + +#ifdef CONFIG_ENC_SILENTLINK + /* check if we have a link, then just return */ + status = phy_read(enc, PHY_REG_PHSTAT1); + if (status & ENC_PHSTAT1_LLSTAT) + return 0; +#endif + + /* wait for link with 1 second timeout */ + etime = get_ticks() + get_tbclk(); + while (get_ticks() <= etime) { + status = phy_read(enc, PHY_REG_PHSTAT1); + if (status & ENC_PHSTAT1_LLSTAT) { + /* now we have a link */ + status = phy_read(enc, PHY_REG_PHSTAT2); + duplex = (status & ENC_PHSTAT2_DPXSTAT) ? 1 : 0; + printf("%s: link up, 10Mbps %s-duplex\n", + enc->dev->name, duplex ? "full" : "half"); + return 0; + } + udelay(1000); + } + + /* timeout occured */ + printf("%s: link down\n", enc->dev->name); + return 1; +} + +/* + * This function resets the receiver only. + */ +static void enc_reset_rx(enc_dev_t *enc) +{ + u8 econ1; + + econ1 = enc_r8(enc, CTL_REG_ECON1); + if ((econ1 & ENC_ECON1_RXRST) == 0) { + enc_bset(enc, CTL_REG_ECON1, ENC_ECON1_RXRST); + enc->rx_reset_counter = RX_RESET_COUNTER; + } +} + +/* + * Reset receiver and reenable it. + */ +static void enc_reset_rx_call(enc_dev_t *enc) +{ + enc_bclr(enc, CTL_REG_ECON1, ENC_ECON1_RXRST); + enc_bset(enc, CTL_REG_ECON1, ENC_ECON1_RXEN); +} + +/* + * Copy a packet from the receive ring and forward it to + * the protocol stack. + */ +static void enc_receive(enc_dev_t *enc) +{ + u8 *packet = (u8 *)NetRxPackets[0]; + u16 pkt_len; + u16 copy_len; + u16 status; + u8 eir_reg; + u8 pkt_cnt = 0; + u16 rxbuf_rdpt; + u8 hbuf[6]; + + enc_w16(enc, CTL_REG_ERDPTL, enc->next_pointer); + do { + enc_rbuf(enc, 6, hbuf); + enc->next_pointer = hbuf[0] | (hbuf[1] << 8); + pkt_len = hbuf[2] | (hbuf[3] << 8); + status = hbuf[4] | (hbuf[5] << 8); + debug("next_pointer=$%04x pkt_len=%u status=$%04x\n", + enc->next_pointer, pkt_len, status); + if (pkt_len <= ENC_MAX_FRM_LEN) + copy_len = pkt_len; + else + copy_len = 0; + if ((status & (1L << 7)) == 0) /* check Received Ok bit */ + copy_len = 0; + /* check if next pointer is resonable */ + if (enc->next_pointer >= ENC_TX_BUF_START) + copy_len = 0; + if (copy_len > 0) { + enc_rbuf(enc, copy_len, packet); + } + /* advance read pointer to next pointer */ + enc_w16(enc, CTL_REG_ERDPTL, enc->next_pointer); + /* decrease packet counter */ + enc_bset(enc, CTL_REG_ECON2, ENC_ECON2_PKTDEC); + /* + * Only odd values should be written to ERXRDPTL, + * see errata B4 pt.13 + */ + rxbuf_rdpt = enc->next_pointer - 1; + if ((rxbuf_rdpt < enc_r16(enc, CTL_REG_ERXSTL)) || + (rxbuf_rdpt > enc_r16(enc, CTL_REG_ERXNDL))) { + enc_w16(enc, CTL_REG_ERXRDPTL, + enc_r16(enc, CTL_REG_ERXNDL)); + } else { + enc_w16(enc, CTL_REG_ERXRDPTL, rxbuf_rdpt); + } + /* read pktcnt */ + pkt_cnt = enc_r8(enc, CTL_REG_EPKTCNT); + if (copy_len == 0) { + eir_reg = enc_r8(enc, CTL_REG_EIR); + enc_reset_rx(enc); + printf("%s: receive copy_len=0\n", enc->dev->name); + continue; + } + /* + * Because NetReceive() might call enc_send(), we need to + * release the SPI bus, call NetReceive(), reclaim the bus + */ + enc_release_bus(enc); + NetReceive(packet, pkt_len); + if (enc_claim_bus(enc)) + return; + eir_reg = enc_r8(enc, CTL_REG_EIR); + } while (pkt_cnt); + /* Use EPKTCNT not EIR.PKTIF flag, see errata pt. 6 */ +} + +/* + * Poll for completely received packets. + */ +static void enc_poll(enc_dev_t *enc) +{ + u8 eir_reg; + u8 estat_reg; + u8 pkt_cnt; + +#ifdef CONFIG_USE_IRQ + /* clear global interrupt enable bit in enc28j60 */ + enc_bclr(enc, CTL_REG_EIE, ENC_EIE_INTIE); +#endif + estat_reg = enc_r8(enc, CTL_REG_ESTAT); + eir_reg = enc_r8(enc, CTL_REG_EIR); + if (eir_reg & ENC_EIR_TXIF) { + /* clear TXIF bit in EIR */ + enc_bclr(enc, CTL_REG_EIR, ENC_EIR_TXIF); + } + /* We have to use pktcnt and not pktif bit, see errata pt. 6 */ + pkt_cnt = enc_r8(enc, CTL_REG_EPKTCNT); + if (pkt_cnt > 0) { + if ((eir_reg & ENC_EIR_PKTIF) == 0) { + debug("enc_poll: pkt cnt > 0, but pktif not set\n"); + } + enc_receive(enc); + /* + * clear PKTIF bit in EIR, this should not need to be done + * but it seems like we get problems if we do not + */ + enc_bclr(enc, CTL_REG_EIR, ENC_EIR_PKTIF); + } + if (eir_reg & ENC_EIR_RXERIF) { + printf("%s: rx error\n", enc->dev->name); + enc_bclr(enc, CTL_REG_EIR, ENC_EIR_RXERIF); + } + if (eir_reg & ENC_EIR_TXERIF) { + printf("%s: tx error\n", enc->dev->name); + enc_bclr(enc, CTL_REG_EIR, ENC_EIR_TXERIF); + } +#ifdef CONFIG_USE_IRQ + /* set global interrupt enable bit in enc28j60 */ + enc_bset(enc, CTL_REG_EIE, ENC_EIE_INTIE); +#endif +} + +/* + * Completely Reset the ENC + */ +static void enc_reset(enc_dev_t *enc) +{ + u8 dout[1]; + + dout[0] = CMD_SRC; + spi_xfer(enc->slave, 8, dout, NULL, + SPI_XFER_BEGIN | SPI_XFER_END); + /* sleep 1 ms. See errata pt. 2 */ + udelay(1000); +} + +/* + * Initialisation data for most of the ENC registers + */ +static const u16 enc_initdata[] = { + /* + * Setup the buffer space. The reset values are valid for the + * other pointers. + * + * We shall not write to ERXST, see errata pt. 5. Instead we + * have to make sure that ENC_RX_BUS_START is 0. + */ + CTL_REG_ERXSTL, ENC_RX_BUF_START, + CTL_REG_ERXSTH, ENC_RX_BUF_START >> 8, + CTL_REG_ERXNDL, ENC_RX_BUF_END, + CTL_REG_ERXNDH, ENC_RX_BUF_END >> 8, + CTL_REG_ERDPTL, ENC_RX_BUF_START, + CTL_REG_ERDPTH, ENC_RX_BUF_START >> 8, + /* + * Set the filter to receive only good-CRC, unicast and broadcast + * frames. + * Note: some DHCP servers return their answers as broadcasts! + * So its unwise to remove broadcast from this. This driver + * might incur receiver overruns with packet loss on a broadcast + * flooded network. + */ + CTL_REG_ERXFCON, ENC_RFR_BCEN | ENC_RFR_UCEN | ENC_RFR_CRCEN, + + /* enable MAC to receive frames */ + CTL_REG_MACON1, + ENC_MACON1_MARXEN | ENC_MACON1_TXPAUS | ENC_MACON1_RXPAUS, + + /* configure pad, tx-crc and duplex */ + CTL_REG_MACON3, + ENC_MACON3_PADCFG0 | ENC_MACON3_TXCRCEN | + ENC_MACON3_FRMLNEN, + + /* Allow infinite deferals if the medium is continously busy */ + CTL_REG_MACON4, ENC_MACON4_DEFER, + + /* Late collisions occur beyond 63 bytes */ + CTL_REG_MACLCON2, 63, + + /* + * Set (low byte) Non-Back-to_Back Inter-Packet Gap. + * Recommended 0x12 + */ + CTL_REG_MAIPGL, 0x12, + + /* + * Set (high byte) Non-Back-to_Back Inter-Packet Gap. + * Recommended 0x0c for half-duplex. Nothing for full-duplex + */ + CTL_REG_MAIPGH, 0x0C, + + /* set maximum frame length */ + CTL_REG_MAMXFLL, ENC_MAX_FRM_LEN, + CTL_REG_MAMXFLH, ENC_MAX_FRM_LEN >> 8, + + /* + * Set MAC back-to-back inter-packet gap. + * Recommended 0x12 for half duplex + * and 0x15 for full duplex. + */ + CTL_REG_MABBIPG, 0x12, + + /* end of table */ + 0xffff +}; + +/* + * Wait for the XTAL oscillator to become ready + */ +static int enc_clock_wait(enc_dev_t *enc) +{ + uint64_t etime; + + /* one second timeout */ + etime = get_ticks() + get_tbclk(); + + /* + * Wait for CLKRDY to become set (i.e., check that we can + * communicate with the ENC) + */ + do + { + if (enc_r8(enc, CTL_REG_ESTAT) & ENC_ESTAT_CLKRDY) + return 0; + } while (get_ticks() <= etime); + + printf("%s: timeout waiting for CLKRDY\n", enc->dev->name); + return -1; +} + +/* + * Write the MAC address into the ENC + */ +static int enc_write_macaddr(enc_dev_t *enc) +{ + unsigned char *p = enc->dev->enetaddr; + + enc_w8_retry(enc, CTL_REG_MAADR5, *p++, 5); + enc_w8_retry(enc, CTL_REG_MAADR4, *p++, 5); + enc_w8_retry(enc, CTL_REG_MAADR3, *p++, 5); + enc_w8_retry(enc, CTL_REG_MAADR2, *p++, 5); + enc_w8_retry(enc, CTL_REG_MAADR1, *p++, 5); + enc_w8_retry(enc, CTL_REG_MAADR0, *p, 5); + return 0; +} + +/* + * Setup most of the ENC registers + */ +static int enc_setup(enc_dev_t *enc) +{ + u16 phid1 = 0; + u16 phid2 = 0; + const u16 *tp; + + /* reset enc struct values */ + enc->next_pointer = ENC_RX_BUF_START; + enc->rx_reset_counter = RX_RESET_COUNTER; + enc->bank = 0xff; /* invalidate current bank in enc28j60 */ + + /* verify PHY identification */ + phid1 = phy_read(enc, PHY_REG_PHID1); + phid2 = phy_read(enc, PHY_REG_PHID2) & ENC_PHID2_MASK; + if (phid1 != ENC_PHID1_VALUE || phid2 != ENC_PHID2_VALUE) { + printf("%s: failed to identify PHY. Found %04x:%04x\n", + enc->dev->name, phid1, phid2); + return -1; + } + + /* now program registers */ + for (tp = enc_initdata; *tp != 0xffff; tp += 2) + enc_w8_retry(enc, tp[0], tp[1], 10); + + /* + * Prevent automatic loopback of data beeing transmitted by setting + * ENC_PHCON2_HDLDIS + */ + phy_write(enc, PHY_REG_PHCON2, (1<<8)); + + /* + * LEDs configuration + * LEDA: LACFG = 0100 -> display link status + * LEDB: LBCFG = 0111 -> display TX & RX activity + * STRCH = 1 -> LED pulses + */ + phy_write(enc, PHY_REG_PHLCON, 0x0472); + + /* Reset PDPXMD-bit => half duplex */ + phy_write(enc, PHY_REG_PHCON1, 0); + +#ifdef CONFIG_USE_IRQ + /* enable interrupts */ + enc_bset(enc, CTL_REG_EIE, ENC_EIE_PKTIE); + enc_bset(enc, CTL_REG_EIE, ENC_EIE_TXIE); + enc_bset(enc, CTL_REG_EIE, ENC_EIE_RXERIE); + enc_bset(enc, CTL_REG_EIE, ENC_EIE_TXERIE); + enc_bset(enc, CTL_REG_EIE, ENC_EIE_INTIE); +#endif + + return 0; +} + +/* + * Check if ENC has been initialized. + * If not, try to initialize it. + * Remember initialized state in struct. + */ +static int enc_initcheck(enc_dev_t *enc, const enum enc_initstate requiredstate) +{ + if (enc->initstate >= requiredstate) + return 0; + + if (enc->initstate < setupdone) { + /* Initialize the ENC only */ + enc_reset(enc); + /* if any of functions fails, skip the rest and return an error */ + if (enc_clock_wait(enc) || enc_setup(enc) || enc_write_macaddr(enc)) { + return -1; + } + enc->initstate = setupdone; + } + /* if that's all we need, return here */ + if (enc->initstate >= requiredstate) + return 0; + + /* now wait for link ready condition */ + if (enc_phy_link_wait(enc)) { + return -1; + } + enc->initstate = linkready; + return 0; +} + +#if defined(CONFIG_CMD_MII) +/* + * Read a PHY register. + * + * This function is registered with miiphy_register(). + */ +int enc_miiphy_read(const char *devname, u8 phy_adr, u8 reg, u16 *value) +{ + struct eth_device *dev = eth_get_dev_by_name(devname); + enc_dev_t *enc; + + if (!dev || phy_adr != 0) + return -1; + + enc = dev->priv; + if (enc_claim_bus(enc)) + return -1; + if (enc_initcheck(enc, setupdone)) { + enc_release_bus(enc); + return -1; + } + *value = phy_read(enc, reg); + enc_release_bus(enc); + return 0; +} + +/* + * Write a PHY register. + * + * This function is registered with miiphy_register(). + */ +int enc_miiphy_write(const char *devname, u8 phy_adr, u8 reg, u16 value) +{ + struct eth_device *dev = eth_get_dev_by_name(devname); + enc_dev_t *enc; + + if (!dev || phy_adr != 0) + return -1; + + enc = dev->priv; + if (enc_claim_bus(enc)) + return -1; + if (enc_initcheck(enc, setupdone)) { + enc_release_bus(enc); + return -1; + } + phy_write(enc, reg, value); + enc_release_bus(enc); + return 0; +} +#endif + +/* + * Write hardware (MAC) address. + * + * This function entered into eth_device structure. + */ +static int enc_write_hwaddr(struct eth_device *dev) +{ + enc_dev_t *enc = dev->priv; + + if (enc_claim_bus(enc)) + return -1; + if (enc_initcheck(enc, setupdone)) { + enc_release_bus(enc); + return -1; + } + enc_release_bus(enc); + return 0; +} + +/* + * Initialize ENC28J60 for use. + * + * This function entered into eth_device structure. + */ +static int enc_init(struct eth_device *dev, bd_t *bis) +{ + enc_dev_t *enc = dev->priv; + + if (enc_claim_bus(enc)) + return -1; + if (enc_initcheck(enc, linkready)) { + enc_release_bus(enc); + return -1; + } + /* enable receive */ + enc_bset(enc, CTL_REG_ECON1, ENC_ECON1_RXEN); + enc_release_bus(enc); + return 0; +} + +/* + * Check for received packets. + * + * This function entered into eth_device structure. + */ +static int enc_recv(struct eth_device *dev) +{ + enc_dev_t *enc = dev->priv; + + if (enc_claim_bus(enc)) + return -1; + if (enc_initcheck(enc, linkready)) { + enc_release_bus(enc); + return -1; + } + /* Check for dead receiver */ + if (enc->rx_reset_counter > 0) + enc->rx_reset_counter--; + else + enc_reset_rx_call(enc); + enc_poll(enc); + enc_release_bus(enc); + return 0; +} + +/* + * Send a packet. + * + * This function entered into eth_device structure. + * + * Should we wait here until we have a Link? Or shall we leave that to + * protocol retries? + */ +static int enc_send( + struct eth_device *dev, + volatile void *packet, + int length) +{ + enc_dev_t *enc = dev->priv; + + if (enc_claim_bus(enc)) + return -1; + if (enc_initcheck(enc, linkready)) { + enc_release_bus(enc); + return -1; + } + /* setup transmit pointers */ + enc_w16(enc, CTL_REG_EWRPTL, ENC_TX_BUF_START); + enc_w16(enc, CTL_REG_ETXNDL, length + ENC_TX_BUF_START); + enc_w16(enc, CTL_REG_ETXSTL, ENC_TX_BUF_START); + /* write packet to ENC */ + enc_wbuf(enc, length, (u8 *) packet, 0x00); + /* + * Check that the internal transmit logic has not been altered + * by excessive collisions. Reset transmitter if so. + * See Errata B4 12 and 14. + */ + if (enc_r8(enc, CTL_REG_EIR) & ENC_EIR_TXERIF) { + enc_bset(enc, CTL_REG_ECON1, ENC_ECON1_TXRST); + enc_bclr(enc, CTL_REG_ECON1, ENC_ECON1_TXRST); + } + enc_bclr(enc, CTL_REG_EIR, (ENC_EIR_TXERIF | ENC_EIR_TXIF)); + /* start transmitting */ + enc_bset(enc, CTL_REG_ECON1, ENC_ECON1_TXRTS); + enc_release_bus(enc); + return 0; +} + +/* + * Finish use of ENC. + * + * This function entered into eth_device structure. + */ +static void enc_halt(struct eth_device *dev) +{ + enc_dev_t *enc = dev->priv; + + if (enc_claim_bus(enc)) + return; + /* Just disable receiver */ + enc_bclr(enc, CTL_REG_ECON1, ENC_ECON1_RXEN); + enc_release_bus(enc); +} + +/* + * This is the only exported function. + * + * It may be called several times with different bus:cs combinations. + */ +int enc28j60_initialize(unsigned int bus, unsigned int cs, + unsigned int max_hz, unsigned int mode) +{ + struct eth_device *dev; + enc_dev_t *enc; + + /* try to allocate, check and clear eth_device object */ + dev = malloc(sizeof(*dev)); + if (!dev) { + return -1; + } + memset(dev, 0, sizeof(*dev)); + + /* try to allocate, check and clear enc_dev_t object */ + enc = malloc(sizeof(*enc)); + if (!enc) { + free(dev); + return -1; + } + memset(enc, 0, sizeof(*enc)); + + /* try to setup the SPI slave */ + enc->slave = spi_setup_slave(bus, cs, max_hz, mode); + if (!enc->slave) { + printf("enc28j60: invalid SPI device %i:%i\n", bus, cs); + free(enc); + free(dev); + return -1; + } + + enc->dev = dev; + /* now fill the eth_device object */ + dev->priv = enc; + dev->init = enc_init; + dev->halt = enc_halt; + dev->send = enc_send; + dev->recv = enc_recv; + dev->write_hwaddr = enc_write_hwaddr; + sprintf(dev->name, "enc%i.%i", bus, cs); + eth_register(dev); +#if defined(CONFIG_CMD_MII) + miiphy_register(dev->name, enc_miiphy_read, enc_miiphy_write); +#endif + return 0; +} |