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u-boot/drivers/net/cs8900.c
Masahiro Yamada b75d8dc564 treewide: convert bd_t to struct bd_info by coccinelle 
The Linux coding style guide (Documentation/process/coding-style.rst)
clearly says:

  It's a **mistake** to use typedef for structures and pointers.

Besides, using typedef for structures is annoying when you try to make
headers self-contained.

Let's say you have the following function declaration in a header:

  void foo(bd_t *bd);

This is not self-contained since bd_t is not defined.

To tell the compiler what 'bd_t' is, you need to include <asm/u-boot.h>

  #include <asm/u-boot.h>
  void foo(bd_t *bd);

Then, the include direcective pulls in more bloat needlessly.

If you use 'struct bd_info' instead, it is enough to put a forward
declaration as follows:

  struct bd_info;
  void foo(struct bd_info *bd);

Right, typedef'ing bd_t is a mistake.

I used coccinelle to generate this commit.

The semantic patch that makes this change is as follows:

  <smpl>
  @@
  typedef bd_t;
  @@
  -bd_t
  +struct bd_info
  </smpl>

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-07-17 09:30:13 -04:00

321 lines
7.9 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0+
/*
* Cirrus Logic CS8900A Ethernet
*
* (C) 2009 Ben Warren , biggerbadderben@gmail.com
* Converted to use CONFIG_NET_MULTI API
*
* (C) 2003 Wolfgang Denk, wd@denx.de
* Extension to synchronize ethaddr environment variable
* against value in EEPROM
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* Copyright (C) 1999 Ben Williamson <benw@pobox.com>
*
* This program is loaded into SRAM in bootstrap mode, where it waits
* for commands on UART1 to read and write memory, jump to code etc.
* A design goal for this program is to be entirely independent of the
* target board. Anything with a CL-PS7111 or EP7211 should be able to run
* this code in bootstrap mode. All the board specifics can be handled on
* the host.
*/
#include <common.h>
#include <command.h>
#include <log.h>
#include <asm/io.h>
#include <net.h>
#include <malloc.h>
#include <linux/delay.h>
#include "cs8900.h"
#undef DEBUG
/* packet page register access functions */
#ifdef CONFIG_CS8900_BUS32
#define REG_WRITE(v, a) writel((v),(a))
#define REG_READ(a) readl((a))
/* we don't need 16 bit initialisation on 32 bit bus */
#define get_reg_init_bus(r,d) get_reg((r),(d))
#else
#define REG_WRITE(v, a) writew((v),(a))
#define REG_READ(a) readw((a))
static u16 get_reg_init_bus(struct eth_device *dev, int regno)
{
/* force 16 bit busmode */
struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
uint8_t volatile * const iob = (uint8_t volatile * const)dev->iobase;
readb(iob);
readb(iob + 1);
readb(iob);
readb(iob + 1);
readb(iob);
REG_WRITE(regno, &priv->regs->pptr);
return REG_READ(&priv->regs->pdata);
}
#endif
static u16 get_reg(struct eth_device *dev, int regno)
{
struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
REG_WRITE(regno, &priv->regs->pptr);
return REG_READ(&priv->regs->pdata);
}
static void put_reg(struct eth_device *dev, int regno, u16 val)
{
struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
REG_WRITE(regno, &priv->regs->pptr);
REG_WRITE(val, &priv->regs->pdata);
}
static void cs8900_reset(struct eth_device *dev)
{
int tmo;
u16 us;
/* reset NIC */
put_reg(dev, PP_SelfCTL, get_reg(dev, PP_SelfCTL) | PP_SelfCTL_Reset);
/* wait for 200ms */
udelay(200000);
/* Wait until the chip is reset */
tmo = get_timer(0) + 1 * CONFIG_SYS_HZ;
while ((((us = get_reg_init_bus(dev, PP_SelfSTAT)) &
PP_SelfSTAT_InitD) == 0) && tmo < get_timer(0))
/*NOP*/;
}
static void cs8900_reginit(struct eth_device *dev)
{
/* receive only error free packets addressed to this card */
put_reg(dev, PP_RxCTL,
PP_RxCTL_IA | PP_RxCTL_Broadcast | PP_RxCTL_RxOK);
/* do not generate any interrupts on receive operations */
put_reg(dev, PP_RxCFG, 0);
/* do not generate any interrupts on transmit operations */
put_reg(dev, PP_TxCFG, 0);
/* do not generate any interrupts on buffer operations */
put_reg(dev, PP_BufCFG, 0);
/* enable transmitter/receiver mode */
put_reg(dev, PP_LineCTL, PP_LineCTL_Rx | PP_LineCTL_Tx);
}
void cs8900_get_enetaddr(struct eth_device *dev)
{
int i;
/* verify chip id */
if (get_reg_init_bus(dev, PP_ChipID) != 0x630e)
return;
cs8900_reset(dev);
if ((get_reg(dev, PP_SelfSTAT) &
(PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) ==
(PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) {
/* Load the MAC from EEPROM */
for (i = 0; i < 3; i++) {
u32 Addr;
Addr = get_reg(dev, PP_IA + i * 2);
dev->enetaddr[i * 2] = Addr & 0xFF;
dev->enetaddr[i * 2 + 1] = Addr >> 8;
}
}
}
void cs8900_halt(struct eth_device *dev)
{
/* disable transmitter/receiver mode */
put_reg(dev, PP_LineCTL, 0);
/* "shutdown" to show ChipID or kernel wouldn't find he cs8900 ... */
get_reg_init_bus(dev, PP_ChipID);
}
static int cs8900_init(struct eth_device *dev, struct bd_info * bd)
{
uchar *enetaddr = dev->enetaddr;
u16 id;
/* verify chip id */
id = get_reg_init_bus(dev, PP_ChipID);
if (id != 0x630e) {
printf ("CS8900 Ethernet chip not found: "
"ID=0x%04x instead 0x%04x\n", id, 0x630e);
return 1;
}
cs8900_reset (dev);
/* set the ethernet address */
put_reg(dev, PP_IA + 0, enetaddr[0] | (enetaddr[1] << 8));
put_reg(dev, PP_IA + 2, enetaddr[2] | (enetaddr[3] << 8));
put_reg(dev, PP_IA + 4, enetaddr[4] | (enetaddr[5] << 8));
cs8900_reginit(dev);
return 0;
}
/* Get a data block via Ethernet */
static int cs8900_recv(struct eth_device *dev)
{
int i;
u16 rxlen;
u16 *addr;
u16 status;
struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
status = get_reg(dev, PP_RER);
if ((status & PP_RER_RxOK) == 0)
return 0;
status = REG_READ(&priv->regs->rtdata);
rxlen = REG_READ(&priv->regs->rtdata);
if (rxlen > PKTSIZE_ALIGN + PKTALIGN)
debug("packet too big!\n");
for (addr = (u16 *)net_rx_packets[0], i = rxlen >> 1; i > 0; i--)
*addr++ = REG_READ(&priv->regs->rtdata);
if (rxlen & 1)
*addr++ = REG_READ(&priv->regs->rtdata);
/* Pass the packet up to the protocol layers. */
net_process_received_packet(net_rx_packets[0], rxlen);
return rxlen;
}
/* Send a data block via Ethernet. */
static int cs8900_send(struct eth_device *dev, void *packet, int length)
{
volatile u16 *addr;
int tmo;
u16 s;
struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv);
retry:
/* initiate a transmit sequence */
REG_WRITE(PP_TxCmd_TxStart_Full, &priv->regs->txcmd);
REG_WRITE(length, &priv->regs->txlen);
/* Test to see if the chip has allocated memory for the packet */
if ((get_reg(dev, PP_BusSTAT) & PP_BusSTAT_TxRDY) == 0) {
/* Oops... this should not happen! */
debug("cs: unable to send packet; retrying...\n");
for (tmo = get_timer(0) + 5 * CONFIG_SYS_HZ;
get_timer(0) < tmo;)
/*NOP*/;
cs8900_reset(dev);
cs8900_reginit(dev);
goto retry;
}
/* Write the contents of the packet */
/* assume even number of bytes */
for (addr = packet; length > 0; length -= 2)
REG_WRITE(*addr++, &priv->regs->rtdata);
/* wait for transfer to succeed */
tmo = get_timer(0) + 5 * CONFIG_SYS_HZ;
while ((s = get_reg(dev, PP_TER) & ~0x1F) == 0) {
if (get_timer(0) >= tmo)
break;
}
/* nothing */ ;
if((s & (PP_TER_CRS | PP_TER_TxOK)) != PP_TER_TxOK) {
debug("\ntransmission error %#x\n", s);
}
return 0;
}
static void cs8900_e2prom_ready(struct eth_device *dev)
{
while (get_reg(dev, PP_SelfSTAT) & SI_BUSY)
;
}
/***********************************************************/
/* read a 16-bit word out of the EEPROM */
/***********************************************************/
int cs8900_e2prom_read(struct eth_device *dev,
u8 addr, u16 *value)
{
cs8900_e2prom_ready(dev);
put_reg(dev, PP_EECMD, EEPROM_READ_CMD | addr);
cs8900_e2prom_ready(dev);
*value = get_reg(dev, PP_EEData);
return 0;
}
/***********************************************************/
/* write a 16-bit word into the EEPROM */
/***********************************************************/
int cs8900_e2prom_write(struct eth_device *dev, u8 addr, u16 value)
{
cs8900_e2prom_ready(dev);
put_reg(dev, PP_EECMD, EEPROM_WRITE_EN);
cs8900_e2prom_ready(dev);
put_reg(dev, PP_EEData, value);
put_reg(dev, PP_EECMD, EEPROM_WRITE_CMD | addr);
cs8900_e2prom_ready(dev);
put_reg(dev, PP_EECMD, EEPROM_WRITE_DIS);
cs8900_e2prom_ready(dev);
return 0;
}
int cs8900_initialize(u8 dev_num, int base_addr)
{
struct eth_device *dev;
struct cs8900_priv *priv;
dev = malloc(sizeof(*dev));
if (!dev) {
return 0;
}
memset(dev, 0, sizeof(*dev));
priv = malloc(sizeof(*priv));
if (!priv) {
free(dev);
return 0;
}
memset(priv, 0, sizeof(*priv));
priv->regs = (struct cs8900_regs *)base_addr;
dev->iobase = base_addr;
dev->priv = priv;
dev->init = cs8900_init;
dev->halt = cs8900_halt;
dev->send = cs8900_send;
dev->recv = cs8900_recv;
/* Load MAC address from EEPROM */
cs8900_get_enetaddr(dev);
sprintf(dev->name, "%s-%hu", CS8900_DRIVERNAME, dev_num);
eth_register(dev);
return 0;
}
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