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u-boot/drivers/net/ftgmac100.c
Zev Weiss f44bf73784 net: ftgmac100: use bus name in mdio error messages 
Previously we'd been using a device name retrieved via
ftgmac100_data->phydev, but the mdio read/write functions may be
called before that member is initialized in ftgmac100_phy_init(),
leading to a NULL pointer dereference while printing the error message
issued if the mdio access fails.  We can instead use bus->name, which
is already available at that point.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Fixes: 538e75d3fc ("net: ftgmac100: add MDIO bus and phylib support")
Reviewed-by: Cédric Le Goater <clg@kaod.org>
2022-08-08 10:50:20 -04:00

657 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Faraday FTGMAC100 Ethernet
*
* (C) Copyright 2009 Faraday Technology
* Po-Yu Chuang <ratbert@faraday-tech.com>
*
* (C) Copyright 2010 Andes Technology
* Macpaul Lin <macpaul@andestech.com>
*
* Copyright (C) 2018, IBM Corporation.
*/
#include <common.h>
#include <clk.h>
#include <cpu_func.h>
#include <dm.h>
#include <log.h>
#include <malloc.h>
#include <miiphy.h>
#include <net.h>
#include <wait_bit.h>
#include <asm/cache.h>
#include <dm/device_compat.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include "ftgmac100.h"
/* Min frame ethernet frame size without FCS */
#define ETH_ZLEN 60
/* Receive Buffer Size Register - HW default is 0x640 */
#define FTGMAC100_RBSR_DEFAULT 0x640
/* PKTBUFSTX/PKTBUFSRX must both be power of 2 */
#define PKTBUFSTX 4 /* must be power of 2 */
/* Timeout for transmit */
#define FTGMAC100_TX_TIMEOUT_MS 1000
/* Timeout for a mdio read/write operation */
#define FTGMAC100_MDIO_TIMEOUT_USEC 10000
/*
* MDC clock cycle threshold
*
* 20us * 100 = 2ms > (1 / 2.5Mhz) * 0x34
*/
#define MDC_CYCTHR 0x34
/*
* ftgmac100 model variants
*/
enum ftgmac100_model {
FTGMAC100_MODEL_FARADAY,
FTGMAC100_MODEL_ASPEED,
};
/**
* struct ftgmac100_data - private data for the FTGMAC100 driver
*
* @iobase: The base address of the hardware registers
* @txdes: The array of transmit descriptors
* @rxdes: The array of receive descriptors
* @tx_index: Transmit descriptor index in @txdes
* @rx_index: Receive descriptor index in @rxdes
* @phy_addr: The PHY interface address to use
* @phydev: The PHY device backing the MAC
* @bus: The mdio bus
* @phy_mode: The mode of the PHY interface (rgmii, rmii, ...)
* @max_speed: Maximum speed of Ethernet connection supported by MAC
* @clks: The bulk of clocks assigned to the device in the DT
* @rxdes0_edorr_mask: The bit number identifying the end of the RX ring buffer
* @txdes0_edotr_mask: The bit number identifying the end of the TX ring buffer
*/
struct ftgmac100_data {
struct ftgmac100 *iobase;
struct ftgmac100_txdes txdes[PKTBUFSTX] __aligned(ARCH_DMA_MINALIGN);
struct ftgmac100_rxdes rxdes[PKTBUFSRX] __aligned(ARCH_DMA_MINALIGN);
int tx_index;
int rx_index;
u32 phy_addr;
struct phy_device *phydev;
struct mii_dev *bus;
u32 phy_mode;
u32 max_speed;
struct clk_bulk clks;
/* End of RX/TX ring buffer bits. Depend on model */
u32 rxdes0_edorr_mask;
u32 txdes0_edotr_mask;
};
/*
* struct mii_bus functions
*/
static int ftgmac100_mdio_read(struct mii_dev *bus, int phy_addr, int dev_addr,
int reg_addr)
{
struct ftgmac100_data *priv = bus->priv;
struct ftgmac100 *ftgmac100 = priv->iobase;
int phycr;
int data;
int ret;
phycr = FTGMAC100_PHYCR_MDC_CYCTHR(MDC_CYCTHR) |
FTGMAC100_PHYCR_PHYAD(phy_addr) |
FTGMAC100_PHYCR_REGAD(reg_addr) |
FTGMAC100_PHYCR_MIIRD;
writel(phycr, &ftgmac100->phycr);
ret = readl_poll_timeout(&ftgmac100->phycr, phycr,
!(phycr & FTGMAC100_PHYCR_MIIRD),
FTGMAC100_MDIO_TIMEOUT_USEC);
if (ret) {
pr_err("%s: mdio read failed (phy:%d reg:%x)\n",
bus->name, phy_addr, reg_addr);
return ret;
}
data = readl(&ftgmac100->phydata);
return FTGMAC100_PHYDATA_MIIRDATA(data);
}
static int ftgmac100_mdio_write(struct mii_dev *bus, int phy_addr, int dev_addr,
int reg_addr, u16 value)
{
struct ftgmac100_data *priv = bus->priv;
struct ftgmac100 *ftgmac100 = priv->iobase;
int phycr;
int data;
int ret;
phycr = FTGMAC100_PHYCR_MDC_CYCTHR(MDC_CYCTHR) |
FTGMAC100_PHYCR_PHYAD(phy_addr) |
FTGMAC100_PHYCR_REGAD(reg_addr) |
FTGMAC100_PHYCR_MIIWR;
data = FTGMAC100_PHYDATA_MIIWDATA(value);
writel(data, &ftgmac100->phydata);
writel(phycr, &ftgmac100->phycr);
ret = readl_poll_timeout(&ftgmac100->phycr, phycr,
!(phycr & FTGMAC100_PHYCR_MIIWR),
FTGMAC100_MDIO_TIMEOUT_USEC);
if (ret) {
pr_err("%s: mdio write failed (phy:%d reg:%x)\n",
bus->name, phy_addr, reg_addr);
}
return ret;
}
static int ftgmac100_mdio_init(struct udevice *dev)
{
struct ftgmac100_data *priv = dev_get_priv(dev);
struct mii_dev *bus;
int ret;
bus = mdio_alloc();
if (!bus)
return -ENOMEM;
bus->read = ftgmac100_mdio_read;
bus->write = ftgmac100_mdio_write;
bus->priv = priv;
ret = mdio_register_seq(bus, dev_seq(dev));
if (ret) {
free(bus);
return ret;
}
priv->bus = bus;
return 0;
}
static int ftgmac100_phy_adjust_link(struct ftgmac100_data *priv)
{
struct ftgmac100 *ftgmac100 = priv->iobase;
struct phy_device *phydev = priv->phydev;
u32 maccr;
if (!phydev->link) {
dev_err(phydev->dev, "No link\n");
return -EREMOTEIO;
}
/* read MAC control register and clear related bits */
maccr = readl(&ftgmac100->maccr) &
~(FTGMAC100_MACCR_GIGA_MODE |
FTGMAC100_MACCR_FAST_MODE |
FTGMAC100_MACCR_FULLDUP);
if (phy_interface_is_rgmii(phydev) && phydev->speed == 1000)
maccr |= FTGMAC100_MACCR_GIGA_MODE;
if (phydev->speed == 100)
maccr |= FTGMAC100_MACCR_FAST_MODE;
if (phydev->duplex)
maccr |= FTGMAC100_MACCR_FULLDUP;
/* update MII config into maccr */
writel(maccr, &ftgmac100->maccr);
return 0;
}
static int ftgmac100_phy_init(struct udevice *dev)
{
struct ftgmac100_data *priv = dev_get_priv(dev);
struct phy_device *phydev;
int ret;
if (IS_ENABLED(CONFIG_DM_MDIO))
phydev = dm_eth_phy_connect(dev);
else
phydev = phy_connect(priv->bus, priv->phy_addr, dev, priv->phy_mode);
if (!phydev)
return -ENODEV;
phydev->supported &= PHY_GBIT_FEATURES;
if (priv->max_speed) {
ret = phy_set_supported(phydev, priv->max_speed);
if (ret)
return ret;
}
phydev->advertising = phydev->supported;
priv->phydev = phydev;
phy_config(phydev);
return 0;
}
/*
* Reset MAC
*/
static void ftgmac100_reset(struct ftgmac100_data *priv)
{
struct ftgmac100 *ftgmac100 = priv->iobase;
debug("%s()\n", __func__);
setbits_le32(&ftgmac100->maccr, FTGMAC100_MACCR_SW_RST);
while (readl(&ftgmac100->maccr) & FTGMAC100_MACCR_SW_RST)
;
}
/*
* Set MAC address
*/
static int ftgmac100_set_mac(struct ftgmac100_data *priv,
const unsigned char *mac)
{
struct ftgmac100 *ftgmac100 = priv->iobase;
unsigned int maddr = mac[0] << 8 | mac[1];
unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5];
debug("%s(%x %x)\n", __func__, maddr, laddr);
writel(maddr, &ftgmac100->mac_madr);
writel(laddr, &ftgmac100->mac_ladr);
return 0;
}
/*
* Get MAC address
*/
static int ftgmac100_get_mac(struct ftgmac100_data *priv,
unsigned char *mac)
{
struct ftgmac100 *ftgmac100 = priv->iobase;
unsigned int maddr = readl(&ftgmac100->mac_madr);
unsigned int laddr = readl(&ftgmac100->mac_ladr);
debug("%s(%x %x)\n", __func__, maddr, laddr);
mac[0] = (maddr >> 8) & 0xff;
mac[1] = maddr & 0xff;
mac[2] = (laddr >> 24) & 0xff;
mac[3] = (laddr >> 16) & 0xff;
mac[4] = (laddr >> 8) & 0xff;
mac[5] = laddr & 0xff;
return 0;
}
/*
* disable transmitter, receiver
*/
static void ftgmac100_stop(struct udevice *dev)
{
struct ftgmac100_data *priv = dev_get_priv(dev);
struct ftgmac100 *ftgmac100 = priv->iobase;
debug("%s()\n", __func__);
writel(0, &ftgmac100->maccr);
phy_shutdown(priv->phydev);
}
static int ftgmac100_start(struct udevice *dev)
{
struct eth_pdata *plat = dev_get_plat(dev);
struct ftgmac100_data *priv = dev_get_priv(dev);
struct ftgmac100 *ftgmac100 = priv->iobase;
struct phy_device *phydev = priv->phydev;
unsigned int maccr;
ulong start, end;
int ret;
int i;
debug("%s()\n", __func__);
ftgmac100_reset(priv);
/* set the ethernet address */
ftgmac100_set_mac(priv, plat->enetaddr);
/* disable all interrupts */
writel(0, &ftgmac100->ier);
/* initialize descriptors */
priv->tx_index = 0;
priv->rx_index = 0;
for (i = 0; i < PKTBUFSTX; i++) {
priv->txdes[i].txdes3 = 0;
priv->txdes[i].txdes0 = 0;
}
priv->txdes[PKTBUFSTX - 1].txdes0 = priv->txdes0_edotr_mask;
start = ((ulong)&priv->txdes[0]) & ~(ARCH_DMA_MINALIGN - 1);
end = start + roundup(sizeof(priv->txdes), ARCH_DMA_MINALIGN);
flush_dcache_range(start, end);
for (i = 0; i < PKTBUFSRX; i++) {
priv->rxdes[i].rxdes3 = (unsigned int)net_rx_packets[i];
priv->rxdes[i].rxdes0 = 0;
}
priv->rxdes[PKTBUFSRX - 1].rxdes0 = priv->rxdes0_edorr_mask;
start = ((ulong)&priv->rxdes[0]) & ~(ARCH_DMA_MINALIGN - 1);
end = start + roundup(sizeof(priv->rxdes), ARCH_DMA_MINALIGN);
flush_dcache_range(start, end);
/* transmit ring */
writel((u32)priv->txdes, &ftgmac100->txr_badr);
/* receive ring */
writel((u32)priv->rxdes, &ftgmac100->rxr_badr);
/* poll receive descriptor automatically */
writel(FTGMAC100_APTC_RXPOLL_CNT(1), &ftgmac100->aptc);
/* config receive buffer size register */
writel(FTGMAC100_RBSR_SIZE(FTGMAC100_RBSR_DEFAULT), &ftgmac100->rbsr);
/* enable transmitter, receiver */
maccr = FTGMAC100_MACCR_TXMAC_EN |
FTGMAC100_MACCR_RXMAC_EN |
FTGMAC100_MACCR_TXDMA_EN |
FTGMAC100_MACCR_RXDMA_EN |
FTGMAC100_MACCR_CRC_APD |
FTGMAC100_MACCR_FULLDUP |
FTGMAC100_MACCR_RX_RUNT |
FTGMAC100_MACCR_RX_BROADPKT;
writel(maccr, &ftgmac100->maccr);
ret = phy_startup(phydev);
if (ret) {
dev_err(phydev->dev, "Could not start PHY\n");
return ret;
}
ret = ftgmac100_phy_adjust_link(priv);
if (ret) {
dev_err(phydev->dev, "Could not adjust link\n");
return ret;
}
printf("%s: link up, %d Mbps %s-duplex mac:%pM\n", phydev->dev->name,
phydev->speed, phydev->duplex ? "full" : "half", plat->enetaddr);
return 0;
}
static int ftgmac100_free_pkt(struct udevice *dev, uchar *packet, int length)
{
struct ftgmac100_data *priv = dev_get_priv(dev);
struct ftgmac100_rxdes *curr_des = &priv->rxdes[priv->rx_index];
ulong des_start = ((ulong)curr_des) & ~(ARCH_DMA_MINALIGN - 1);
ulong des_end = des_start +
roundup(sizeof(*curr_des), ARCH_DMA_MINALIGN);
/* Release buffer to DMA and flush descriptor */
curr_des->rxdes0 &= ~FTGMAC100_RXDES0_RXPKT_RDY;
flush_dcache_range(des_start, des_end);
/* Move to next descriptor */
priv->rx_index = (priv->rx_index + 1) % PKTBUFSRX;
return 0;
}
/*
* Get a data block via Ethernet
*/
static int ftgmac100_recv(struct udevice *dev, int flags, uchar **packetp)
{
struct ftgmac100_data *priv = dev_get_priv(dev);
struct ftgmac100_rxdes *curr_des = &priv->rxdes[priv->rx_index];
unsigned short rxlen;
ulong des_start = ((ulong)curr_des) & ~(ARCH_DMA_MINALIGN - 1);
ulong des_end = des_start +
roundup(sizeof(*curr_des), ARCH_DMA_MINALIGN);
ulong data_start = curr_des->rxdes3;
ulong data_end;
invalidate_dcache_range(des_start, des_end);
if (!(curr_des->rxdes0 & FTGMAC100_RXDES0_RXPKT_RDY))
return -EAGAIN;
if (curr_des->rxdes0 & (FTGMAC100_RXDES0_RX_ERR |
FTGMAC100_RXDES0_CRC_ERR |
FTGMAC100_RXDES0_FTL |
FTGMAC100_RXDES0_RUNT |
FTGMAC100_RXDES0_RX_ODD_NB)) {
return -EAGAIN;
}
rxlen = FTGMAC100_RXDES0_VDBC(curr_des->rxdes0);
debug("%s(): RX buffer %d, %x received\n",
__func__, priv->rx_index, rxlen);
/* Invalidate received data */
data_end = data_start + roundup(rxlen, ARCH_DMA_MINALIGN);
invalidate_dcache_range(data_start, data_end);
*packetp = (uchar *)data_start;
return rxlen;
}
static u32 ftgmac100_read_txdesc(const void *desc)
{
const struct ftgmac100_txdes *txdes = desc;
ulong des_start = ((ulong)txdes) & ~(ARCH_DMA_MINALIGN - 1);
ulong des_end = des_start + roundup(sizeof(*txdes), ARCH_DMA_MINALIGN);
invalidate_dcache_range(des_start, des_end);
return txdes->txdes0;
}
BUILD_WAIT_FOR_BIT(ftgmac100_txdone, u32, ftgmac100_read_txdesc)
/*
* Send a data block via Ethernet
*/
static int ftgmac100_send(struct udevice *dev, void *packet, int length)
{
struct ftgmac100_data *priv = dev_get_priv(dev);
struct ftgmac100 *ftgmac100 = priv->iobase;
struct ftgmac100_txdes *curr_des = &priv->txdes[priv->tx_index];
ulong des_start = ((ulong)curr_des) & ~(ARCH_DMA_MINALIGN - 1);
ulong des_end = des_start +
roundup(sizeof(*curr_des), ARCH_DMA_MINALIGN);
ulong data_start;
ulong data_end;
int rc;
invalidate_dcache_range(des_start, des_end);
if (curr_des->txdes0 & FTGMAC100_TXDES0_TXDMA_OWN) {
dev_err(dev, "no TX descriptor available\n");
return -EPERM;
}
debug("%s(%x, %x)\n", __func__, (int)packet, length);
length = (length < ETH_ZLEN) ? ETH_ZLEN : length;
curr_des->txdes3 = (unsigned int)packet;
/* Flush data to be sent */
data_start = curr_des->txdes3;
data_end = data_start + roundup(length, ARCH_DMA_MINALIGN);
flush_dcache_range(data_start, data_end);
/* Only one segment on TXBUF */
curr_des->txdes0 &= priv->txdes0_edotr_mask;
curr_des->txdes0 |= FTGMAC100_TXDES0_FTS |
FTGMAC100_TXDES0_LTS |
FTGMAC100_TXDES0_TXBUF_SIZE(length) |
FTGMAC100_TXDES0_TXDMA_OWN ;
/* Flush modified buffer descriptor */
flush_dcache_range(des_start, des_end);
/* Start transmit */
writel(1, &ftgmac100->txpd);
rc = wait_for_bit_ftgmac100_txdone(curr_des,
FTGMAC100_TXDES0_TXDMA_OWN, false,
FTGMAC100_TX_TIMEOUT_MS, true);
if (rc)
return rc;
debug("%s(): packet sent\n", __func__);
/* Move to next descriptor */
priv->tx_index = (priv->tx_index + 1) % PKTBUFSTX;
return 0;
}
static int ftgmac100_write_hwaddr(struct udevice *dev)
{
struct eth_pdata *pdata = dev_get_plat(dev);
struct ftgmac100_data *priv = dev_get_priv(dev);
return ftgmac100_set_mac(priv, pdata->enetaddr);
}
static int ftgmac_read_hwaddr(struct udevice *dev)
{
struct eth_pdata *pdata = dev_get_plat(dev);
struct ftgmac100_data *priv = dev_get_priv(dev);
return ftgmac100_get_mac(priv, pdata->enetaddr);
}
static int ftgmac100_of_to_plat(struct udevice *dev)
{
struct eth_pdata *pdata = dev_get_plat(dev);
struct ftgmac100_data *priv = dev_get_priv(dev);
pdata->iobase = dev_read_addr(dev);
pdata->phy_interface = dev_read_phy_mode(dev);
if (pdata->phy_interface == PHY_INTERFACE_MODE_NA)
return -EINVAL;
pdata->max_speed = dev_read_u32_default(dev, "max-speed", 0);
if (dev_get_driver_data(dev) == FTGMAC100_MODEL_ASPEED) {
priv->rxdes0_edorr_mask = BIT(30);
priv->txdes0_edotr_mask = BIT(30);
} else {
priv->rxdes0_edorr_mask = BIT(15);
priv->txdes0_edotr_mask = BIT(15);
}
return clk_get_bulk(dev, &priv->clks);
}
static int ftgmac100_probe(struct udevice *dev)
{
struct eth_pdata *pdata = dev_get_plat(dev);
struct ftgmac100_data *priv = dev_get_priv(dev);
int ret;
priv->iobase = (struct ftgmac100 *)pdata->iobase;
priv->phy_mode = pdata->phy_interface;
priv->max_speed = pdata->max_speed;
priv->phy_addr = 0;
#ifdef CONFIG_PHY_ADDR
priv->phy_addr = CONFIG_PHY_ADDR;
#endif
ret = clk_enable_bulk(&priv->clks);
if (ret)
goto out;
/*
* If DM MDIO is enabled, the MDIO bus will be initialized later in
* dm_eth_phy_connect
*/
if (!IS_ENABLED(CONFIG_DM_MDIO)) {
ret = ftgmac100_mdio_init(dev);
if (ret) {
dev_err(dev, "Failed to initialize mdiobus: %d\n", ret);
goto out;
}
}
ret = ftgmac100_phy_init(dev);
if (ret) {
dev_err(dev, "Failed to initialize PHY: %d\n", ret);
goto out;
}
ftgmac_read_hwaddr(dev);
out:
if (ret)
clk_release_bulk(&priv->clks);
return ret;
}
static int ftgmac100_remove(struct udevice *dev)
{
struct ftgmac100_data *priv = dev_get_priv(dev);
free(priv->phydev);
mdio_unregister(priv->bus);
mdio_free(priv->bus);
clk_release_bulk(&priv->clks);
return 0;
}
static const struct eth_ops ftgmac100_ops = {
.start = ftgmac100_start,
.send = ftgmac100_send,
.recv = ftgmac100_recv,
.stop = ftgmac100_stop,
.free_pkt = ftgmac100_free_pkt,
.write_hwaddr = ftgmac100_write_hwaddr,
};
static const struct udevice_id ftgmac100_ids[] = {
{ .compatible = "faraday,ftgmac100", .data = FTGMAC100_MODEL_FARADAY },
{ .compatible = "aspeed,ast2500-mac", .data = FTGMAC100_MODEL_ASPEED },
{ .compatible = "aspeed,ast2600-mac", .data = FTGMAC100_MODEL_ASPEED },
{ }
};
U_BOOT_DRIVER(ftgmac100) = {
.name = "ftgmac100",
.id = UCLASS_ETH,
.of_match = ftgmac100_ids,
.of_to_plat = ftgmac100_of_to_plat,
.probe = ftgmac100_probe,
.remove = ftgmac100_remove,
.ops = &ftgmac100_ops,
.priv_auto = sizeof(struct ftgmac100_data),
.plat_auto = sizeof(struct eth_pdata),
.flags = DM_FLAG_ALLOC_PRIV_DMA,
};
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