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u-boot/drivers/net/xilinx_emaclite.c
T Karthik Reddy 8faeb023e9 net: xilinx: axi_emaclite: Use shared MDIO bus support for axi emaclite driver 
CONFIG_DM_ETH_PHY enables support to utilize generic ethernet phy
framework. Though if ethernet PHY node is in other ethernet node, it
will use shared MDIO to access the PHY of other ethernet. Move ethernet
print info statement from plat function to probe function, as phyaddr is
not enumerated when CONFIG_DM_ETH_PHY is enabled.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Acked-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Link: https://lore.kernel.org/r/93e11ccca56b6e52b2dcc283d08d5042537f828f.1652181968.git.michal.simek@amd.com
2022-06-24 14:11:05 +02:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2007-2009 Michal Simek
* (C) Copyright 2003 Xilinx Inc.
*
* Michal SIMEK <monstr@monstr.eu>
*/
#include <common.h>
#include <log.h>
#include <net.h>
#include <config.h>
#include <dm.h>
#include <console.h>
#include <malloc.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <phy.h>
#include <miiphy.h>
#include <fdtdec.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <eth_phy.h>
DECLARE_GLOBAL_DATA_PTR;
#define ENET_ADDR_LENGTH 6
#define ETH_FCS_LEN 4 /* Octets in the FCS */
/* Xmit complete */
#define XEL_TSR_XMIT_BUSY_MASK 0x00000001UL
/* Xmit interrupt enable bit */
#define XEL_TSR_XMIT_IE_MASK 0x00000008UL
/* Program the MAC address */
#define XEL_TSR_PROGRAM_MASK 0x00000002UL
/* define for programming the MAC address into the EMAC Lite */
#define XEL_TSR_PROG_MAC_ADDR (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_PROGRAM_MASK)
/* Transmit packet length upper byte */
#define XEL_TPLR_LENGTH_MASK_HI 0x0000FF00UL
/* Transmit packet length lower byte */
#define XEL_TPLR_LENGTH_MASK_LO 0x000000FFUL
/* Recv complete */
#define XEL_RSR_RECV_DONE_MASK 0x00000001UL
/* Recv interrupt enable bit */
#define XEL_RSR_RECV_IE_MASK 0x00000008UL
/* MDIO Address Register Bit Masks */
#define XEL_MDIOADDR_REGADR_MASK 0x0000001F /* Register Address */
#define XEL_MDIOADDR_PHYADR_MASK 0x000003E0 /* PHY Address */
#define XEL_MDIOADDR_PHYADR_SHIFT 5
#define XEL_MDIOADDR_OP_MASK 0x00000400 /* RD/WR Operation */
/* MDIO Write Data Register Bit Masks */
#define XEL_MDIOWR_WRDATA_MASK 0x0000FFFF /* Data to be Written */
/* MDIO Read Data Register Bit Masks */
#define XEL_MDIORD_RDDATA_MASK 0x0000FFFF /* Data to be Read */
/* MDIO Control Register Bit Masks */
#define XEL_MDIOCTRL_MDIOSTS_MASK 0x00000001 /* MDIO Status Mask */
#define XEL_MDIOCTRL_MDIOEN_MASK 0x00000008 /* MDIO Enable */
struct emaclite_regs {
u32 tx_ping; /* 0x0 - TX Ping buffer */
u32 reserved1[504];
u32 mdioaddr; /* 0x7e4 - MDIO Address Register */
u32 mdiowr; /* 0x7e8 - MDIO Write Data Register */
u32 mdiord;/* 0x7ec - MDIO Read Data Register */
u32 mdioctrl; /* 0x7f0 - MDIO Control Register */
u32 tx_ping_tplr; /* 0x7f4 - Tx packet length */
u32 global_interrupt; /* 0x7f8 - Global interrupt enable */
u32 tx_ping_tsr; /* 0x7fc - Tx status */
u32 tx_pong; /* 0x800 - TX Pong buffer */
u32 reserved2[508];
u32 tx_pong_tplr; /* 0xff4 - Tx packet length */
u32 reserved3; /* 0xff8 */
u32 tx_pong_tsr; /* 0xffc - Tx status */
u32 rx_ping; /* 0x1000 - Receive Buffer */
u32 reserved4[510];
u32 rx_ping_rsr; /* 0x17fc - Rx status */
u32 rx_pong; /* 0x1800 - Receive Buffer */
u32 reserved5[510];
u32 rx_pong_rsr; /* 0x1ffc - Rx status */
};
struct xemaclite {
bool use_rx_pong_buffer_next; /* Next RX buffer to read from */
u32 txpp; /* TX ping pong buffer */
u32 rxpp; /* RX ping pong buffer */
int phyaddr;
struct emaclite_regs *regs;
struct phy_device *phydev;
struct mii_dev *bus;
};
static uchar etherrxbuff[PKTSIZE_ALIGN]; /* Receive buffer */
static void xemaclite_alignedread(u32 *srcptr, void *destptr, u32 bytecount)
{
u32 i;
u32 alignbuffer;
u32 *to32ptr;
u32 *from32ptr;
u8 *to8ptr;
u8 *from8ptr;
from32ptr = (u32 *) srcptr;
/* Word aligned buffer, no correction needed. */
to32ptr = (u32 *) destptr;
while (bytecount > 3) {
*to32ptr++ = *from32ptr++;
bytecount -= 4;
}
to8ptr = (u8 *) to32ptr;
alignbuffer = *from32ptr++;
from8ptr = (u8 *) &alignbuffer;
for (i = 0; i < bytecount; i++)
*to8ptr++ = *from8ptr++;
}
static void xemaclite_alignedwrite(void *srcptr, u32 *destptr, u32 bytecount)
{
u32 i;
u32 alignbuffer;
u32 *to32ptr = (u32 *) destptr;
u32 *from32ptr;
u8 *to8ptr;
u8 *from8ptr;
from32ptr = (u32 *) srcptr;
while (bytecount > 3) {
*to32ptr++ = *from32ptr++;
bytecount -= 4;
}
alignbuffer = 0;
to8ptr = (u8 *) &alignbuffer;
from8ptr = (u8 *) from32ptr;
for (i = 0; i < bytecount; i++)
*to8ptr++ = *from8ptr++;
*to32ptr++ = alignbuffer;
}
static int wait_for_bit(const char *func, u32 *reg, const u32 mask,
bool set, unsigned int timeout)
{
u32 val;
unsigned long start = get_timer(0);
while (1) {
val = __raw_readl(reg);
if (!set)
val = ~val;
if ((val & mask) == mask)
return 0;
if (get_timer(start) > timeout)
break;
if (ctrlc()) {
puts("Abort\n");
return -EINTR;
}
udelay(1);
}
debug("%s: Timeout (reg=%p mask=%08x wait_set=%i)\n",
func, reg, mask, set);
return -ETIMEDOUT;
}
static int mdio_wait(struct emaclite_regs *regs)
{
return wait_for_bit(__func__, &regs->mdioctrl,
XEL_MDIOCTRL_MDIOSTS_MASK, false, 2000);
}
static u32 phyread(struct xemaclite *emaclite, u32 phyaddress, u32 registernum,
u16 *data)
{
struct emaclite_regs *regs = emaclite->regs;
if (mdio_wait(regs))
return 1;
u32 ctrl_reg = __raw_readl(&regs->mdioctrl);
__raw_writel(XEL_MDIOADDR_OP_MASK
| ((phyaddress << XEL_MDIOADDR_PHYADR_SHIFT)
| registernum), &regs->mdioaddr);
__raw_writel(ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK, &regs->mdioctrl);
if (mdio_wait(regs))
return 1;
/* Read data */
*data = __raw_readl(&regs->mdiord);
return 0;
}
static u32 phywrite(struct xemaclite *emaclite, u32 phyaddress, u32 registernum,
u16 data)
{
struct emaclite_regs *regs = emaclite->regs;
if (mdio_wait(regs))
return 1;
/*
* Write the PHY address, register number and clear the OP bit in the
* MDIO Address register and then write the value into the MDIO Write
* Data register. Finally, set the Status bit in the MDIO Control
* register to start a MDIO write transaction.
*/
u32 ctrl_reg = __raw_readl(&regs->mdioctrl);
__raw_writel(~XEL_MDIOADDR_OP_MASK
& ((phyaddress << XEL_MDIOADDR_PHYADR_SHIFT)
| registernum), &regs->mdioaddr);
__raw_writel(data, &regs->mdiowr);
__raw_writel(ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK, &regs->mdioctrl);
if (mdio_wait(regs))
return 1;
return 0;
}
static void emaclite_stop(struct udevice *dev)
{
debug("eth_stop\n");
}
/* Use MII register 1 (MII status register) to detect PHY */
#define PHY_DETECT_REG 1
/* Mask used to verify certain PHY features (or register contents)
* in the register above:
* 0x1000: 10Mbps full duplex support
* 0x0800: 10Mbps half duplex support
* 0x0008: Auto-negotiation support
*/
#define PHY_DETECT_MASK 0x1808
static int setup_phy(struct udevice *dev)
{
int i, ret;
u16 phyreg;
struct xemaclite *emaclite = dev_get_priv(dev);
struct phy_device *phydev;
u32 supported = SUPPORTED_10baseT_Half |
SUPPORTED_10baseT_Full |
SUPPORTED_100baseT_Half |
SUPPORTED_100baseT_Full;
if (emaclite->phyaddr != -1) {
phyread(emaclite, emaclite->phyaddr, PHY_DETECT_REG, &phyreg);
if ((phyreg != 0xFFFF) &&
((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) {
/* Found a valid PHY address */
debug("Default phy address %d is valid\n",
emaclite->phyaddr);
} else {
debug("PHY address is not setup correctly %d\n",
emaclite->phyaddr);
emaclite->phyaddr = -1;
}
}
if (emaclite->phyaddr == -1) {
/* detect the PHY address */
for (i = 31; i >= 0; i--) {
phyread(emaclite, i, PHY_DETECT_REG, &phyreg);
if ((phyreg != 0xFFFF) &&
((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) {
/* Found a valid PHY address */
emaclite->phyaddr = i;
debug("emaclite: Found valid phy address, %d\n",
i);
break;
}
}
}
/* interface - look at tsec */
phydev = phy_connect(emaclite->bus, emaclite->phyaddr, dev,
PHY_INTERFACE_MODE_MII);
/*
* Phy can support 1000baseT but device NOT that's why phydev->supported
* must be setup for 1000baseT. phydev->advertising setups what speeds
* will be used for autonegotiation where 1000baseT must be disabled.
*/
phydev->supported = supported | SUPPORTED_1000baseT_Half |
SUPPORTED_1000baseT_Full;
phydev->advertising = supported;
emaclite->phydev = phydev;
phy_config(phydev);
ret = phy_startup(phydev);
if (ret)
return ret;
if (!phydev->link) {
printf("%s: No link.\n", phydev->dev->name);
return 0;
}
/* Do not setup anything */
return 1;
}
static int emaclite_start(struct udevice *dev)
{
struct xemaclite *emaclite = dev_get_priv(dev);
struct eth_pdata *pdata = dev_get_plat(dev);
struct emaclite_regs *regs = emaclite->regs;
debug("EmacLite Initialization Started\n");
/*
* TX - TX_PING & TX_PONG initialization
*/
/* Restart PING TX */
__raw_writel(0, &regs->tx_ping_tsr);
/* Copy MAC address */
xemaclite_alignedwrite(pdata->enetaddr, &regs->tx_ping,
ENET_ADDR_LENGTH);
/* Set the length */
__raw_writel(ENET_ADDR_LENGTH, &regs->tx_ping_tplr);
/* Update the MAC address in the EMAC Lite */
__raw_writel(XEL_TSR_PROG_MAC_ADDR, &regs->tx_ping_tsr);
/* Wait for EMAC Lite to finish with the MAC address update */
while ((__raw_readl(&regs->tx_ping_tsr) &
XEL_TSR_PROG_MAC_ADDR) != 0)
;
if (emaclite->txpp) {
/* The same operation with PONG TX */
__raw_writel(0, &regs->tx_pong_tsr);
xemaclite_alignedwrite(pdata->enetaddr, &regs->tx_pong,
ENET_ADDR_LENGTH);
__raw_writel(ENET_ADDR_LENGTH, &regs->tx_pong_tplr);
__raw_writel(XEL_TSR_PROG_MAC_ADDR, &regs->tx_pong_tsr);
while ((__raw_readl(&regs->tx_pong_tsr) &
XEL_TSR_PROG_MAC_ADDR) != 0)
;
}
/*
* RX - RX_PING & RX_PONG initialization
*/
/* Write out the value to flush the RX buffer */
__raw_writel(XEL_RSR_RECV_IE_MASK, &regs->rx_ping_rsr);
if (emaclite->rxpp)
__raw_writel(XEL_RSR_RECV_IE_MASK, &regs->rx_pong_rsr);
__raw_writel(XEL_MDIOCTRL_MDIOEN_MASK, &regs->mdioctrl);
if (__raw_readl(&regs->mdioctrl) & XEL_MDIOCTRL_MDIOEN_MASK)
if (!setup_phy(dev))
return -1;
debug("EmacLite Initialization complete\n");
return 0;
}
static int xemaclite_txbufferavailable(struct xemaclite *emaclite)
{
u32 tmp;
struct emaclite_regs *regs = emaclite->regs;
/*
* Read the other buffer register
* and determine if the other buffer is available
*/
tmp = ~__raw_readl(&regs->tx_ping_tsr);
if (emaclite->txpp)
tmp |= ~__raw_readl(&regs->tx_pong_tsr);
return !(tmp & XEL_TSR_XMIT_BUSY_MASK);
}
static int emaclite_send(struct udevice *dev, void *ptr, int len)
{
u32 reg;
struct xemaclite *emaclite = dev_get_priv(dev);
struct emaclite_regs *regs = emaclite->regs;
u32 maxtry = 1000;
if (len > PKTSIZE)
len = PKTSIZE;
while (xemaclite_txbufferavailable(emaclite) && maxtry) {
udelay(10);
maxtry--;
}
if (!maxtry) {
printf("Error: Timeout waiting for ethernet TX buffer\n");
/* Restart PING TX */
__raw_writel(0, &regs->tx_ping_tsr);
if (emaclite->txpp) {
__raw_writel(0, &regs->tx_pong_tsr);
}
return -1;
}
/* Determine if the expected buffer address is empty */
reg = __raw_readl(&regs->tx_ping_tsr);
if ((reg & XEL_TSR_XMIT_BUSY_MASK) == 0) {
debug("Send packet from tx_ping buffer\n");
/* Write the frame to the buffer */
xemaclite_alignedwrite(ptr, &regs->tx_ping, len);
__raw_writel(len
& (XEL_TPLR_LENGTH_MASK_HI | XEL_TPLR_LENGTH_MASK_LO),
&regs->tx_ping_tplr);
reg = __raw_readl(&regs->tx_ping_tsr);
reg |= XEL_TSR_XMIT_BUSY_MASK;
__raw_writel(reg, &regs->tx_ping_tsr);
return 0;
}
if (emaclite->txpp) {
/* Determine if the expected buffer address is empty */
reg = __raw_readl(&regs->tx_pong_tsr);
if ((reg & XEL_TSR_XMIT_BUSY_MASK) == 0) {
debug("Send packet from tx_pong buffer\n");
/* Write the frame to the buffer */
xemaclite_alignedwrite(ptr, &regs->tx_pong, len);
__raw_writel(len &
(XEL_TPLR_LENGTH_MASK_HI |
XEL_TPLR_LENGTH_MASK_LO),
&regs->tx_pong_tplr);
reg = __raw_readl(&regs->tx_pong_tsr);
reg |= XEL_TSR_XMIT_BUSY_MASK;
__raw_writel(reg, &regs->tx_pong_tsr);
return 0;
}
}
puts("Error while sending frame\n");
return -1;
}
static int emaclite_recv(struct udevice *dev, int flags, uchar **packetp)
{
u32 length, first_read, reg, attempt = 0;
void *addr, *ack;
struct xemaclite *emaclite = dev_get_priv(dev);
struct emaclite_regs *regs = emaclite->regs;
struct ethernet_hdr *eth;
struct ip_udp_hdr *ip;
try_again:
if (!emaclite->use_rx_pong_buffer_next) {
reg = __raw_readl(&regs->rx_ping_rsr);
debug("Testing data at rx_ping\n");
if ((reg & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
debug("Data found in rx_ping buffer\n");
addr = &regs->rx_ping;
ack = &regs->rx_ping_rsr;
} else {
debug("Data not found in rx_ping buffer\n");
/* Pong buffer is not available - return immediately */
if (!emaclite->rxpp)
return -1;
/* Try pong buffer if this is first attempt */
if (attempt++)
return -1;
emaclite->use_rx_pong_buffer_next =
!emaclite->use_rx_pong_buffer_next;
goto try_again;
}
} else {
reg = __raw_readl(&regs->rx_pong_rsr);
debug("Testing data at rx_pong\n");
if ((reg & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
debug("Data found in rx_pong buffer\n");
addr = &regs->rx_pong;
ack = &regs->rx_pong_rsr;
} else {
debug("Data not found in rx_pong buffer\n");
/* Try ping buffer if this is first attempt */
if (attempt++)
return -1;
emaclite->use_rx_pong_buffer_next =
!emaclite->use_rx_pong_buffer_next;
goto try_again;
}
}
/* Read all bytes for ARP packet with 32bit alignment - 48bytes */
first_read = ALIGN(ETHER_HDR_SIZE + ARP_HDR_SIZE + ETH_FCS_LEN, 4);
xemaclite_alignedread(addr, etherrxbuff, first_read);
/* Detect real packet size */
eth = (struct ethernet_hdr *)etherrxbuff;
switch (ntohs(eth->et_protlen)) {
case PROT_ARP:
length = first_read;
debug("ARP Packet %x\n", length);
break;
case PROT_IP:
ip = (struct ip_udp_hdr *)(etherrxbuff + ETHER_HDR_SIZE);
length = ntohs(ip->ip_len);
length += ETHER_HDR_SIZE + ETH_FCS_LEN;
debug("IP Packet %x\n", length);
break;
default:
debug("Other Packet\n");
length = PKTSIZE;
break;
}
/* Read the rest of the packet which is longer then first read */
if (length != first_read)
xemaclite_alignedread(addr + first_read,
etherrxbuff + first_read,
length - first_read);
/* Acknowledge the frame */
reg = __raw_readl(ack);
reg &= ~XEL_RSR_RECV_DONE_MASK;
__raw_writel(reg, ack);
debug("Packet receive from 0x%p, length %dB\n", addr, length);
*packetp = etherrxbuff;
return length;
}
static int emaclite_miiphy_read(struct mii_dev *bus, int addr,
int devad, int reg)
{
u32 ret;
u16 val = 0;
ret = phyread(bus->priv, addr, reg, &val);
debug("emaclite: Read MII 0x%x, 0x%x, 0x%x, %d\n", addr, reg, val, ret);
return val;
}
static int emaclite_miiphy_write(struct mii_dev *bus, int addr, int devad,
int reg, u16 value)
{
debug("emaclite: Write MII 0x%x, 0x%x, 0x%x\n", addr, reg, value);
return phywrite(bus->priv, addr, reg, value);
}
static int emaclite_probe(struct udevice *dev)
{
struct xemaclite *emaclite = dev_get_priv(dev);
int ret;
if (IS_ENABLED(CONFIG_DM_ETH_PHY))
emaclite->bus = eth_phy_get_mdio_bus(dev);
if (!emaclite->bus) {
emaclite->bus = mdio_alloc();
emaclite->bus->read = emaclite_miiphy_read;
emaclite->bus->write = emaclite_miiphy_write;
emaclite->bus->priv = emaclite;
ret = mdio_register_seq(emaclite->bus, dev_seq(dev));
if (ret)
return ret;
}
if (IS_ENABLED(CONFIG_DM_ETH_PHY)) {
eth_phy_set_mdio_bus(dev, emaclite->bus);
emaclite->phyaddr = eth_phy_get_addr(dev);
}
printf("EMACLITE: %lx, phyaddr %d, %d/%d\n", (ulong)emaclite->regs,
emaclite->phyaddr, emaclite->txpp, emaclite->rxpp);
return 0;
}
static int emaclite_remove(struct udevice *dev)
{
struct xemaclite *emaclite = dev_get_priv(dev);
free(emaclite->phydev);
mdio_unregister(emaclite->bus);
mdio_free(emaclite->bus);
return 0;
}
static const struct eth_ops emaclite_ops = {
.start = emaclite_start,
.send = emaclite_send,
.recv = emaclite_recv,
.stop = emaclite_stop,
};
static int emaclite_of_to_plat(struct udevice *dev)
{
struct eth_pdata *pdata = dev_get_plat(dev);
struct xemaclite *emaclite = dev_get_priv(dev);
int offset = 0;
pdata->iobase = dev_read_addr(dev);
emaclite->regs = (struct emaclite_regs *)ioremap_nocache(pdata->iobase,
0x10000);
emaclite->phyaddr = -1;
if (!(IS_ENABLED(CONFIG_DM_ETH_PHY))) {
offset = fdtdec_lookup_phandle(gd->fdt_blob, dev_of_offset(dev),
"phy-handle");
if (offset > 0)
emaclite->phyaddr = fdtdec_get_int(gd->fdt_blob,
offset, "reg", -1);
}
emaclite->txpp = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
"xlnx,tx-ping-pong", 0);
emaclite->rxpp = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
"xlnx,rx-ping-pong", 0);
return 0;
}
static const struct udevice_id emaclite_ids[] = {
{ .compatible = "xlnx,xps-ethernetlite-1.00.a" },
{ }
};
U_BOOT_DRIVER(emaclite) = {
.name = "emaclite",
.id = UCLASS_ETH,
.of_match = emaclite_ids,
.of_to_plat = emaclite_of_to_plat,
.probe = emaclite_probe,
.remove = emaclite_remove,
.ops = &emaclite_ops,
.priv_auto = sizeof(struct xemaclite),
.plat_auto = sizeof(struct eth_pdata),
};
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