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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
319 lines
7.8 KiB
C
319 lines
7.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Cirrus Logic CS8900A Ethernet
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*
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* (C) 2009 Ben Warren , biggerbadderben@gmail.com
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* Converted to use CONFIG_NET_MULTI API
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*
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* (C) 2003 Wolfgang Denk, wd@denx.de
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* Extension to synchronize ethaddr environment variable
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* against value in EEPROM
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* Copyright (C) 1999 Ben Williamson <benw@pobox.com>
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*
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* This program is loaded into SRAM in bootstrap mode, where it waits
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* for commands on UART1 to read and write memory, jump to code etc.
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* A design goal for this program is to be entirely independent of the
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* target board. Anything with a CL-PS7111 or EP7211 should be able to run
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* this code in bootstrap mode. All the board specifics can be handled on
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* the host.
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*/
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#include <common.h>
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#include <command.h>
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#include <asm/io.h>
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#include <net.h>
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#include <malloc.h>
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#include "cs8900.h"
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#undef DEBUG
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/* packet page register access functions */
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#ifdef CONFIG_CS8900_BUS32
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#define REG_WRITE(v, a) writel((v),(a))
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#define REG_READ(a) readl((a))
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/* we don't need 16 bit initialisation on 32 bit bus */
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#define get_reg_init_bus(r,d) get_reg((r),(d))
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#else
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#define REG_WRITE(v, a) writew((v),(a))
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#define REG_READ(a) readw((a))
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static u16 get_reg_init_bus(struct eth_device *dev, int regno)
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{
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/* force 16 bit busmode */
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struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
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uint8_t volatile * const iob = (uint8_t volatile * const)dev->iobase;
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readb(iob);
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readb(iob + 1);
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readb(iob);
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readb(iob + 1);
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readb(iob);
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REG_WRITE(regno, &priv->regs->pptr);
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return REG_READ(&priv->regs->pdata);
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}
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#endif
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static u16 get_reg(struct eth_device *dev, int regno)
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{
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struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
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REG_WRITE(regno, &priv->regs->pptr);
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return REG_READ(&priv->regs->pdata);
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}
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static void put_reg(struct eth_device *dev, int regno, u16 val)
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{
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struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
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REG_WRITE(regno, &priv->regs->pptr);
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REG_WRITE(val, &priv->regs->pdata);
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}
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static void cs8900_reset(struct eth_device *dev)
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{
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int tmo;
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u16 us;
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/* reset NIC */
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put_reg(dev, PP_SelfCTL, get_reg(dev, PP_SelfCTL) | PP_SelfCTL_Reset);
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/* wait for 200ms */
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udelay(200000);
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/* Wait until the chip is reset */
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tmo = get_timer(0) + 1 * CONFIG_SYS_HZ;
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while ((((us = get_reg_init_bus(dev, PP_SelfSTAT)) &
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PP_SelfSTAT_InitD) == 0) && tmo < get_timer(0))
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/*NOP*/;
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}
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static void cs8900_reginit(struct eth_device *dev)
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{
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/* receive only error free packets addressed to this card */
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put_reg(dev, PP_RxCTL,
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PP_RxCTL_IA | PP_RxCTL_Broadcast | PP_RxCTL_RxOK);
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/* do not generate any interrupts on receive operations */
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put_reg(dev, PP_RxCFG, 0);
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/* do not generate any interrupts on transmit operations */
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put_reg(dev, PP_TxCFG, 0);
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/* do not generate any interrupts on buffer operations */
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put_reg(dev, PP_BufCFG, 0);
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/* enable transmitter/receiver mode */
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put_reg(dev, PP_LineCTL, PP_LineCTL_Rx | PP_LineCTL_Tx);
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}
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void cs8900_get_enetaddr(struct eth_device *dev)
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{
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int i;
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/* verify chip id */
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if (get_reg_init_bus(dev, PP_ChipID) != 0x630e)
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return;
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cs8900_reset(dev);
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if ((get_reg(dev, PP_SelfSTAT) &
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(PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) ==
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(PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) {
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/* Load the MAC from EEPROM */
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for (i = 0; i < 3; i++) {
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u32 Addr;
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Addr = get_reg(dev, PP_IA + i * 2);
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dev->enetaddr[i * 2] = Addr & 0xFF;
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dev->enetaddr[i * 2 + 1] = Addr >> 8;
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}
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}
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}
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void cs8900_halt(struct eth_device *dev)
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{
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/* disable transmitter/receiver mode */
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put_reg(dev, PP_LineCTL, 0);
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/* "shutdown" to show ChipID or kernel wouldn't find he cs8900 ... */
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get_reg_init_bus(dev, PP_ChipID);
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}
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static int cs8900_init(struct eth_device *dev, bd_t * bd)
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{
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uchar *enetaddr = dev->enetaddr;
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u16 id;
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/* verify chip id */
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id = get_reg_init_bus(dev, PP_ChipID);
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if (id != 0x630e) {
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printf ("CS8900 Ethernet chip not found: "
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"ID=0x%04x instead 0x%04x\n", id, 0x630e);
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return 1;
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}
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cs8900_reset (dev);
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/* set the ethernet address */
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put_reg(dev, PP_IA + 0, enetaddr[0] | (enetaddr[1] << 8));
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put_reg(dev, PP_IA + 2, enetaddr[2] | (enetaddr[3] << 8));
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put_reg(dev, PP_IA + 4, enetaddr[4] | (enetaddr[5] << 8));
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cs8900_reginit(dev);
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return 0;
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}
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/* Get a data block via Ethernet */
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static int cs8900_recv(struct eth_device *dev)
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{
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int i;
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u16 rxlen;
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u16 *addr;
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u16 status;
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struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
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status = get_reg(dev, PP_RER);
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if ((status & PP_RER_RxOK) == 0)
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return 0;
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status = REG_READ(&priv->regs->rtdata);
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rxlen = REG_READ(&priv->regs->rtdata);
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if (rxlen > PKTSIZE_ALIGN + PKTALIGN)
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debug("packet too big!\n");
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for (addr = (u16 *)net_rx_packets[0], i = rxlen >> 1; i > 0; i--)
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*addr++ = REG_READ(&priv->regs->rtdata);
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if (rxlen & 1)
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*addr++ = REG_READ(&priv->regs->rtdata);
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/* Pass the packet up to the protocol layers. */
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net_process_received_packet(net_rx_packets[0], rxlen);
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return rxlen;
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}
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/* Send a data block via Ethernet. */
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static int cs8900_send(struct eth_device *dev, void *packet, int length)
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{
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volatile u16 *addr;
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int tmo;
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u16 s;
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struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
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retry:
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/* initiate a transmit sequence */
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REG_WRITE(PP_TxCmd_TxStart_Full, &priv->regs->txcmd);
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REG_WRITE(length, &priv->regs->txlen);
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/* Test to see if the chip has allocated memory for the packet */
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if ((get_reg(dev, PP_BusSTAT) & PP_BusSTAT_TxRDY) == 0) {
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/* Oops... this should not happen! */
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debug("cs: unable to send packet; retrying...\n");
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for (tmo = get_timer(0) + 5 * CONFIG_SYS_HZ;
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get_timer(0) < tmo;)
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/*NOP*/;
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cs8900_reset(dev);
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cs8900_reginit(dev);
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goto retry;
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}
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/* Write the contents of the packet */
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/* assume even number of bytes */
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for (addr = packet; length > 0; length -= 2)
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REG_WRITE(*addr++, &priv->regs->rtdata);
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/* wait for transfer to succeed */
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tmo = get_timer(0) + 5 * CONFIG_SYS_HZ;
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while ((s = get_reg(dev, PP_TER) & ~0x1F) == 0) {
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if (get_timer(0) >= tmo)
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break;
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}
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/* nothing */ ;
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if((s & (PP_TER_CRS | PP_TER_TxOK)) != PP_TER_TxOK) {
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debug("\ntransmission error %#x\n", s);
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}
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return 0;
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}
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static void cs8900_e2prom_ready(struct eth_device *dev)
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{
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while (get_reg(dev, PP_SelfSTAT) & SI_BUSY)
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;
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}
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/***********************************************************/
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/* read a 16-bit word out of the EEPROM */
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/***********************************************************/
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int cs8900_e2prom_read(struct eth_device *dev,
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u8 addr, u16 *value)
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{
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cs8900_e2prom_ready(dev);
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put_reg(dev, PP_EECMD, EEPROM_READ_CMD | addr);
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cs8900_e2prom_ready(dev);
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*value = get_reg(dev, PP_EEData);
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return 0;
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}
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/***********************************************************/
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/* write a 16-bit word into the EEPROM */
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/***********************************************************/
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int cs8900_e2prom_write(struct eth_device *dev, u8 addr, u16 value)
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{
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cs8900_e2prom_ready(dev);
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put_reg(dev, PP_EECMD, EEPROM_WRITE_EN);
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cs8900_e2prom_ready(dev);
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put_reg(dev, PP_EEData, value);
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put_reg(dev, PP_EECMD, EEPROM_WRITE_CMD | addr);
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cs8900_e2prom_ready(dev);
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put_reg(dev, PP_EECMD, EEPROM_WRITE_DIS);
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cs8900_e2prom_ready(dev);
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return 0;
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}
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int cs8900_initialize(u8 dev_num, int base_addr)
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{
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struct eth_device *dev;
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struct cs8900_priv *priv;
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dev = malloc(sizeof(*dev));
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if (!dev) {
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return 0;
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}
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memset(dev, 0, sizeof(*dev));
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priv = malloc(sizeof(*priv));
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if (!priv) {
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free(dev);
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return 0;
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}
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memset(priv, 0, sizeof(*priv));
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priv->regs = (struct cs8900_regs *)base_addr;
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dev->iobase = base_addr;
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dev->priv = priv;
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dev->init = cs8900_init;
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dev->halt = cs8900_halt;
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dev->send = cs8900_send;
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dev->recv = cs8900_recv;
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/* Load MAC address from EEPROM */
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cs8900_get_enetaddr(dev);
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sprintf(dev->name, "%s-%hu", CS8900_DRIVERNAME, dev_num);
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eth_register(dev);
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return 0;
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}
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