u-boot/drivers/net/ks8851_mll.c
Marek Vasut dd70ff4815 net: ks8851: Reset internal RXFC count on bad packet
A sporadic condition occurs when the "bad packet" error is triggered
repeatedly, which results in "bad packet" messages scrolling on the
console during transfer. To avoid triggering this, reset the internal
RXFC count on the first occurance of the "bad packet", which forces
the code to re-read the RX packet count from the MAC, and prevents
any additional "bad packet" messages if there are no more packets in
the MAC. Also print better debug information if this condition occurs.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Eugen Hristev <eugen.hristev@microchip.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Tom Rini <trini@konsulko.com>
2021-01-19 09:15:02 -05:00

706 lines
16 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Micrel KS8851_MLL 16bit Network driver
* Copyright (c) 2011 Roberto Cerati <roberto.cerati@bticino.it>
*/
#include <log.h>
#include <asm/io.h>
#include <common.h>
#include <command.h>
#include <malloc.h>
#include <net.h>
#include <miiphy.h>
#include <linux/delay.h>
#include "ks8851_mll.h"
#define DRIVERNAME "ks8851_mll"
#define RX_BUF_SIZE 2000
/*
* struct ks_net - KS8851 driver private data
* @dev : legacy non-DM ethernet device structure
* @iobase : register base
* @bus_width : i/o bus width.
* @sharedbus : Multipex(addr and data bus) mode indicator.
* @extra_byte : number of extra byte prepended rx pkt.
*/
struct ks_net {
#ifndef CONFIG_DM_ETH
struct eth_device dev;
#endif
phys_addr_t iobase;
int bus_width;
u16 sharedbus;
u16 rxfc;
u8 extra_byte;
};
#define BE3 0x8000 /* Byte Enable 3 */
#define BE2 0x4000 /* Byte Enable 2 */
#define BE1 0x2000 /* Byte Enable 1 */
#define BE0 0x1000 /* Byte Enable 0 */
static u8 ks_rdreg8(struct ks_net *ks, u16 offset)
{
u8 shift_bit = offset & 0x03;
u8 shift_data = (offset & 1) << 3;
writew(offset | (BE0 << shift_bit), ks->iobase + 2);
return (u8)(readw(ks->iobase) >> shift_data);
}
static u16 ks_rdreg16(struct ks_net *ks, u16 offset)
{
writew(offset | ((BE1 | BE0) << (offset & 0x02)), ks->iobase + 2);
return readw(ks->iobase);
}
static void ks_wrreg16(struct ks_net *ks, u16 offset, u16 val)
{
writew(offset | ((BE1 | BE0) << (offset & 0x02)), ks->iobase + 2);
writew(val, ks->iobase);
}
/*
* ks_inblk - read a block of data from QMU. This is called after sudo DMA mode
* enabled.
* @ks: The chip state
* @wptr: buffer address to save data
* @len: length in byte to read
*/
static inline void ks_inblk(struct ks_net *ks, u16 *wptr, u32 len)
{
len >>= 1;
while (len--)
*wptr++ = readw(ks->iobase);
}
/*
* ks_outblk - write data to QMU. This is called after sudo DMA mode enabled.
* @ks: The chip information
* @wptr: buffer address
* @len: length in byte to write
*/
static inline void ks_outblk(struct ks_net *ks, u16 *wptr, u32 len)
{
len >>= 1;
while (len--)
writew(*wptr++, ks->iobase);
}
static void ks_enable_int(struct ks_net *ks)
{
ks_wrreg16(ks, KS_IER, IRQ_LCI | IRQ_TXI | IRQ_RXI);
}
static void ks_set_powermode(struct ks_net *ks, unsigned int pwrmode)
{
unsigned int pmecr;
ks_rdreg16(ks, KS_GRR);
pmecr = ks_rdreg16(ks, KS_PMECR);
pmecr &= ~PMECR_PM_MASK;
pmecr |= pwrmode;
ks_wrreg16(ks, KS_PMECR, pmecr);
}
/*
* ks_read_config - read chip configuration of bus width.
* @ks: The chip information
*/
static void ks_read_config(struct ks_net *ks)
{
u16 reg_data = 0;
/* Regardless of bus width, 8 bit read should always work. */
reg_data = ks_rdreg8(ks, KS_CCR) & 0x00FF;
reg_data |= ks_rdreg8(ks, KS_CCR + 1) << 8;
/* addr/data bus are multiplexed */
ks->sharedbus = (reg_data & CCR_SHARED) == CCR_SHARED;
/*
* There are garbage data when reading data from QMU,
* depending on bus-width.
*/
if (reg_data & CCR_8BIT) {
ks->bus_width = ENUM_BUS_8BIT;
ks->extra_byte = 1;
} else if (reg_data & CCR_16BIT) {
ks->bus_width = ENUM_BUS_16BIT;
ks->extra_byte = 2;
} else {
ks->bus_width = ENUM_BUS_32BIT;
ks->extra_byte = 4;
}
}
/*
* ks_soft_reset - issue one of the soft reset to the device
* @ks: The device state.
* @op: The bit(s) to set in the GRR
*
* Issue the relevant soft-reset command to the device's GRR register
* specified by @op.
*
* Note, the delays are in there as a caution to ensure that the reset
* has time to take effect and then complete. Since the datasheet does
* not currently specify the exact sequence, we have chosen something
* that seems to work with our device.
*/
static void ks_soft_reset(struct ks_net *ks, unsigned int op)
{
/* Disable interrupt first */
ks_wrreg16(ks, KS_IER, 0x0000);
ks_wrreg16(ks, KS_GRR, op);
mdelay(10); /* wait a short time to effect reset */
ks_wrreg16(ks, KS_GRR, 0);
mdelay(1); /* wait for condition to clear */
}
void ks_enable_qmu(struct ks_net *ks)
{
u16 w;
w = ks_rdreg16(ks, KS_TXCR);
/* Enables QMU Transmit (TXCR). */
ks_wrreg16(ks, KS_TXCR, w | TXCR_TXE);
/* Enable RX Frame Count Threshold and Auto-Dequeue RXQ Frame */
w = ks_rdreg16(ks, KS_RXQCR);
ks_wrreg16(ks, KS_RXQCR, w | RXQCR_RXFCTE);
/* Enables QMU Receive (RXCR1). */
w = ks_rdreg16(ks, KS_RXCR1);
ks_wrreg16(ks, KS_RXCR1, w | RXCR1_RXE);
}
static void ks_disable_qmu(struct ks_net *ks)
{
u16 w;
w = ks_rdreg16(ks, KS_TXCR);
/* Disables QMU Transmit (TXCR). */
w &= ~TXCR_TXE;
ks_wrreg16(ks, KS_TXCR, w);
/* Disables QMU Receive (RXCR1). */
w = ks_rdreg16(ks, KS_RXCR1);
w &= ~RXCR1_RXE;
ks_wrreg16(ks, KS_RXCR1, w);
}
static inline void ks_read_qmu(struct ks_net *ks, u16 *buf, u32 len)
{
u32 r = ks->extra_byte & 0x1;
u32 w = ks->extra_byte - r;
/* 1. set sudo DMA mode */
ks_wrreg16(ks, KS_RXFDPR, RXFDPR_RXFPAI);
ks_wrreg16(ks, KS_RXQCR, RXQCR_CMD_CNTL | RXQCR_SDA);
/*
* 2. read prepend data
*
* read 4 + extra bytes and discard them.
* extra bytes for dummy, 2 for status, 2 for len
*/
if (r)
ks_rdreg8(ks, 0);
ks_inblk(ks, buf, w + 2 + 2);
/* 3. read pkt data */
ks_inblk(ks, buf, ALIGN(len, 4));
/* 4. reset sudo DMA Mode */
ks_wrreg16(ks, KS_RXQCR, RXQCR_CMD_CNTL);
}
static int ks_rcv(struct ks_net *ks, uchar *data)
{
u16 sts, len;
if (!ks->rxfc)
ks->rxfc = ks_rdreg16(ks, KS_RXFCTR) >> 8;
if (!ks->rxfc)
return 0;
/* Checking Received packet status */
sts = ks_rdreg16(ks, KS_RXFHSR);
/* Get packet len from hardware */
len = ks_rdreg16(ks, KS_RXFHBCR);
if ((sts & RXFSHR_RXFV) && len && (len < RX_BUF_SIZE)) {
/* read data block including CRC 4 bytes */
ks_read_qmu(ks, (u16 *)data, len);
ks->rxfc--;
return len - 4;
}
ks_wrreg16(ks, KS_RXQCR, RXQCR_CMD_CNTL | RXQCR_RRXEF);
printf(DRIVERNAME ": bad packet (sts=0x%04x len=0x%04x)\n", sts, len);
ks->rxfc = 0;
return 0;
}
/*
* ks_read_selftest - read the selftest memory info.
* @ks: The device state
*
* Read and check the TX/RX memory selftest information.
*/
static int ks_read_selftest(struct ks_net *ks)
{
u16 both_done = MBIR_TXMBF | MBIR_RXMBF;
u16 mbir;
int ret = 0;
mbir = ks_rdreg16(ks, KS_MBIR);
if ((mbir & both_done) != both_done) {
printf(DRIVERNAME ": Memory selftest not finished\n");
return 0;
}
if (mbir & MBIR_TXMBFA) {
printf(DRIVERNAME ": TX memory selftest fails\n");
ret |= 1;
}
if (mbir & MBIR_RXMBFA) {
printf(DRIVERNAME ": RX memory selftest fails\n");
ret |= 2;
}
debug(DRIVERNAME ": the selftest passes\n");
return ret;
}
static void ks_setup(struct ks_net *ks)
{
u16 w;
/* Setup Transmit Frame Data Pointer Auto-Increment (TXFDPR) */
ks_wrreg16(ks, KS_TXFDPR, TXFDPR_TXFPAI);
/* Setup Receive Frame Data Pointer Auto-Increment */
ks_wrreg16(ks, KS_RXFDPR, RXFDPR_RXFPAI);
/* Setup Receive Frame Threshold - 1 frame (RXFCTFC) */
ks_wrreg16(ks, KS_RXFCTR, 1 & RXFCTR_THRESHOLD_MASK);
/* Setup RxQ Command Control (RXQCR) */
ks_wrreg16(ks, KS_RXQCR, RXQCR_CMD_CNTL);
/*
* set the force mode to half duplex, default is full duplex
* because if the auto-negotiation fails, most switch uses
* half-duplex.
*/
w = ks_rdreg16(ks, KS_P1MBCR);
w &= ~P1MBCR_FORCE_FDX;
ks_wrreg16(ks, KS_P1MBCR, w);
w = TXCR_TXFCE | TXCR_TXPE | TXCR_TXCRC | TXCR_TCGIP;
ks_wrreg16(ks, KS_TXCR, w);
w = RXCR1_RXFCE | RXCR1_RXBE | RXCR1_RXUE | RXCR1_RXME | RXCR1_RXIPFCC;
/* Normal mode */
w |= RXCR1_RXPAFMA;
ks_wrreg16(ks, KS_RXCR1, w);
}
static void ks_setup_int(struct ks_net *ks)
{
/* Clear the interrupts status of the hardware. */
ks_wrreg16(ks, KS_ISR, 0xffff);
}
static int ks8851_mll_detect_chip(struct ks_net *ks)
{
unsigned short val;
ks_read_config(ks);
val = ks_rdreg16(ks, KS_CIDER);
if (val == 0xffff) {
/* Special case -- no chip present */
printf(DRIVERNAME ": is chip mounted ?\n");
return -1;
} else if ((val & 0xfff0) != CIDER_ID) {
printf(DRIVERNAME ": Invalid chip id 0x%04x\n", val);
return -1;
}
debug("Read back KS8851 id 0x%x\n", val);
if ((val & 0xfff0) != CIDER_ID) {
printf(DRIVERNAME ": Unknown chip ID %04x\n", val);
return -1;
}
return 0;
}
static void ks8851_mll_reset(struct ks_net *ks)
{
/* wake up powermode to normal mode */
ks_set_powermode(ks, PMECR_PM_NORMAL);
mdelay(1); /* wait for normal mode to take effect */
/* Disable interrupt and reset */
ks_soft_reset(ks, GRR_GSR);
/* turn off the IRQs and ack any outstanding */
ks_wrreg16(ks, KS_IER, 0x0000);
ks_wrreg16(ks, KS_ISR, 0xffff);
/* shutdown RX/TX QMU */
ks_disable_qmu(ks);
}
static void ks8851_mll_phy_configure(struct ks_net *ks)
{
u16 data;
ks_setup(ks);
ks_setup_int(ks);
/* Probing the phy */
data = ks_rdreg16(ks, KS_OBCR);
ks_wrreg16(ks, KS_OBCR, data | OBCR_ODS_16MA);
debug(DRIVERNAME ": phy initialized\n");
}
static void ks8851_mll_enable(struct ks_net *ks)
{
ks_wrreg16(ks, KS_ISR, 0xffff);
ks_enable_int(ks);
ks_enable_qmu(ks);
}
static int ks8851_mll_init_common(struct ks_net *ks)
{
if (ks_read_selftest(ks)) {
printf(DRIVERNAME ": Selftest failed\n");
return -1;
}
ks8851_mll_reset(ks);
/* Configure the PHY, initialize the link state */
ks8851_mll_phy_configure(ks);
ks->rxfc = 0;
/* Turn on Tx + Rx */
ks8851_mll_enable(ks);
return 0;
}
static void ks_write_qmu(struct ks_net *ks, u8 *pdata, u16 len)
{
__le16 txw[2];
/* start header at txb[0] to align txw entries */
txw[0] = 0;
txw[1] = cpu_to_le16(len);
/* 1. set sudo-DMA mode */
ks_wrreg16(ks, KS_TXFDPR, TXFDPR_TXFPAI);
ks_wrreg16(ks, KS_RXQCR, RXQCR_CMD_CNTL | RXQCR_SDA);
/* 2. write status/length info */
ks_outblk(ks, txw, 4);
/* 3. write pkt data */
ks_outblk(ks, (u16 *)pdata, ALIGN(len, 4));
/* 4. reset sudo-DMA mode */
ks_wrreg16(ks, KS_RXQCR, RXQCR_CMD_CNTL);
/* 5. Enqueue Tx(move the pkt from TX buffer into TXQ) */
ks_wrreg16(ks, KS_TXQCR, TXQCR_METFE);
/* 6. wait until TXQCR_METFE is auto-cleared */
do { } while (ks_rdreg16(ks, KS_TXQCR) & TXQCR_METFE);
}
static int ks8851_mll_send_common(struct ks_net *ks, void *packet, int length)
{
u8 *data = (u8 *)packet;
u16 tmplen = (u16)length;
u16 retv;
/*
* Extra space are required:
* 4 byte for alignment, 4 for status/length, 4 for CRC
*/
retv = ks_rdreg16(ks, KS_TXMIR) & 0x1fff;
if (retv >= tmplen + 12) {
ks_write_qmu(ks, data, tmplen);
return 0;
}
printf(DRIVERNAME ": failed to send packet: No buffer\n");
return -1;
}
static void ks8851_mll_halt_common(struct ks_net *ks)
{
ks8851_mll_reset(ks);
}
/*
* Maximum receive ring size; that is, the number of packets
* we can buffer before overflow happens. Basically, this just
* needs to be enough to prevent a packet being discarded while
* we are processing the previous one.
*/
static int ks8851_mll_recv_common(struct ks_net *ks, uchar *data)
{
u16 status;
int ret = 0;
status = ks_rdreg16(ks, KS_ISR);
ks_wrreg16(ks, KS_ISR, status);
if (ks->rxfc || (status & IRQ_RXI))
ret = ks_rcv(ks, data);
if (status & IRQ_LDI) {
u16 pmecr = ks_rdreg16(ks, KS_PMECR);
pmecr &= ~PMECR_WKEVT_MASK;
ks_wrreg16(ks, KS_PMECR, pmecr | PMECR_WKEVT_LINK);
}
return ret;
}
static void ks8851_mll_write_hwaddr_common(struct ks_net *ks, u8 enetaddr[6])
{
u16 addrl, addrm, addrh;
addrh = (enetaddr[0] << 8) | enetaddr[1];
addrm = (enetaddr[2] << 8) | enetaddr[3];
addrl = (enetaddr[4] << 8) | enetaddr[5];
ks_wrreg16(ks, KS_MARH, addrh);
ks_wrreg16(ks, KS_MARM, addrm);
ks_wrreg16(ks, KS_MARL, addrl);
}
#ifndef CONFIG_DM_ETH
static int ks8851_mll_init(struct eth_device *dev, struct bd_info *bd)
{
struct ks_net *ks = container_of(dev, struct ks_net, dev);
return ks8851_mll_init_common(ks);
}
static void ks8851_mll_halt(struct eth_device *dev)
{
struct ks_net *ks = container_of(dev, struct ks_net, dev);
ks8851_mll_halt_common(ks);
}
static int ks8851_mll_send(struct eth_device *dev, void *packet, int length)
{
struct ks_net *ks = container_of(dev, struct ks_net, dev);
return ks8851_mll_send_common(ks, packet, length);
}
static int ks8851_mll_recv(struct eth_device *dev)
{
struct ks_net *ks = container_of(dev, struct ks_net, dev);
int ret;
ret = ks8851_mll_recv_common(ks, net_rx_packets[0]);
if (ret)
net_process_received_packet(net_rx_packets[0], ret);
return ret;
}
static int ks8851_mll_write_hwaddr(struct eth_device *dev)
{
struct ks_net *ks = container_of(dev, struct ks_net, dev);
ks8851_mll_write_hwaddr_common(ks, ks->dev.enetaddr);
return 0;
}
int ks8851_mll_initialize(u8 dev_num, int base_addr)
{
struct ks_net *ks;
ks = calloc(1, sizeof(*ks));
if (!ks)
return -ENOMEM;
ks->iobase = base_addr;
/* Try to detect chip. Will fail if not present. */
if (ks8851_mll_detect_chip(ks)) {
free(ks);
return -1;
}
ks->dev.init = ks8851_mll_init;
ks->dev.halt = ks8851_mll_halt;
ks->dev.send = ks8851_mll_send;
ks->dev.recv = ks8851_mll_recv;
ks->dev.write_hwaddr = ks8851_mll_write_hwaddr;
sprintf(ks->dev.name, "%s-%hu", DRIVERNAME, dev_num);
eth_register(&ks->dev);
return 0;
}
#else /* ifdef CONFIG_DM_ETH */
static int ks8851_start(struct udevice *dev)
{
struct ks_net *ks = dev_get_priv(dev);
return ks8851_mll_init_common(ks);
}
static void ks8851_stop(struct udevice *dev)
{
struct ks_net *ks = dev_get_priv(dev);
ks8851_mll_halt_common(ks);
}
static int ks8851_send(struct udevice *dev, void *packet, int length)
{
struct ks_net *ks = dev_get_priv(dev);
int ret;
ret = ks8851_mll_send_common(ks, packet, length);
return ret ? 0 : -ETIMEDOUT;
}
static int ks8851_recv(struct udevice *dev, int flags, uchar **packetp)
{
struct ks_net *ks = dev_get_priv(dev);
uchar *data = net_rx_packets[0];
int ret;
ret = ks8851_mll_recv_common(ks, data);
if (ret)
*packetp = (void *)data;
return ret ? ret : -EAGAIN;
}
static int ks8851_write_hwaddr(struct udevice *dev)
{
struct ks_net *ks = dev_get_priv(dev);
struct eth_pdata *pdata = dev_get_plat(dev);
ks8851_mll_write_hwaddr_common(ks, pdata->enetaddr);
return 0;
}
static int ks8851_read_rom_hwaddr(struct udevice *dev)
{
struct ks_net *ks = dev_get_priv(dev);
struct eth_pdata *pdata = dev_get_plat(dev);
u16 addrl, addrm, addrh;
/* No EEPROM means no valid MAC address. */
if (!(ks_rdreg16(ks, KS_CCR) & CCR_EEPROM))
return -EINVAL;
/*
* If the EEPROM contains valid MAC address, it is loaded into
* the NIC on power on. Read the MAC out of the NIC registers.
*/
addrl = ks_rdreg16(ks, KS_MARL);
addrm = ks_rdreg16(ks, KS_MARM);
addrh = ks_rdreg16(ks, KS_MARH);
pdata->enetaddr[0] = (addrh >> 8) & 0xff;
pdata->enetaddr[1] = addrh & 0xff;
pdata->enetaddr[2] = (addrm >> 8) & 0xff;
pdata->enetaddr[3] = addrm & 0xff;
pdata->enetaddr[4] = (addrl >> 8) & 0xff;
pdata->enetaddr[5] = addrl & 0xff;
return !is_valid_ethaddr(pdata->enetaddr);
}
static int ks8851_bind(struct udevice *dev)
{
return device_set_name(dev, dev->name);
}
static int ks8851_probe(struct udevice *dev)
{
struct ks_net *ks = dev_get_priv(dev);
/* Try to detect chip. Will fail if not present. */
ks8851_mll_detect_chip(ks);
return 0;
}
static int ks8851_of_to_plat(struct udevice *dev)
{
struct ks_net *ks = dev_get_priv(dev);
struct eth_pdata *pdata = dev_get_plat(dev);
pdata->iobase = dev_read_addr(dev);
ks->iobase = pdata->iobase;
return 0;
}
static const struct eth_ops ks8851_ops = {
.start = ks8851_start,
.stop = ks8851_stop,
.send = ks8851_send,
.recv = ks8851_recv,
.write_hwaddr = ks8851_write_hwaddr,
.read_rom_hwaddr = ks8851_read_rom_hwaddr,
};
static const struct udevice_id ks8851_ids[] = {
{ .compatible = "micrel,ks8851-mll" },
{ }
};
U_BOOT_DRIVER(ks8851) = {
.name = "eth_ks8851",
.id = UCLASS_ETH,
.of_match = ks8851_ids,
.bind = ks8851_bind,
.of_to_plat = ks8851_of_to_plat,
.probe = ks8851_probe,
.ops = &ks8851_ops,
.priv_auto = sizeof(struct ks_net),
.plat_auto = sizeof(struct eth_pdata),
.flags = DM_FLAG_ALLOC_PRIV_DMA,
};
#endif