u-boot/drivers/net/zynq_gem.c

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/*
* (C) Copyright 2011 Michal Simek
*
* Michal SIMEK <monstr@monstr.eu>
*
* Based on Xilinx gmac driver:
* (C) Copyright 2011 Xilinx
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <net.h>
#include <netdev.h>
#include <config.h>
#include <fdtdec.h>
#include <libfdt.h>
#include <malloc.h>
#include <asm/io.h>
#include <phy.h>
#include <miiphy.h>
#include <watchdog.h>
#include <asm/system.h>
#include <asm/arch/hardware.h>
#include <asm/arch/sys_proto.h>
#if !defined(CONFIG_PHYLIB)
# error XILINX_GEM_ETHERNET requires PHYLIB
#endif
/* Bit/mask specification */
#define ZYNQ_GEM_PHYMNTNC_OP_MASK 0x40020000 /* operation mask bits */
#define ZYNQ_GEM_PHYMNTNC_OP_R_MASK 0x20000000 /* read operation */
#define ZYNQ_GEM_PHYMNTNC_OP_W_MASK 0x10000000 /* write operation */
#define ZYNQ_GEM_PHYMNTNC_PHYAD_SHIFT_MASK 23 /* Shift bits for PHYAD */
#define ZYNQ_GEM_PHYMNTNC_PHREG_SHIFT_MASK 18 /* Shift bits for PHREG */
#define ZYNQ_GEM_RXBUF_EOF_MASK 0x00008000 /* End of frame. */
#define ZYNQ_GEM_RXBUF_SOF_MASK 0x00004000 /* Start of frame. */
#define ZYNQ_GEM_RXBUF_LEN_MASK 0x00003FFF /* Mask for length field */
#define ZYNQ_GEM_RXBUF_WRAP_MASK 0x00000002 /* Wrap bit, last BD */
#define ZYNQ_GEM_RXBUF_NEW_MASK 0x00000001 /* Used bit.. */
#define ZYNQ_GEM_RXBUF_ADD_MASK 0xFFFFFFFC /* Mask for address */
/* Wrap bit, last descriptor */
#define ZYNQ_GEM_TXBUF_WRAP_MASK 0x40000000
#define ZYNQ_GEM_TXBUF_LAST_MASK 0x00008000 /* Last buffer */
#define ZYNQ_GEM_NWCTRL_TXEN_MASK 0x00000008 /* Enable transmit */
#define ZYNQ_GEM_NWCTRL_RXEN_MASK 0x00000004 /* Enable receive */
#define ZYNQ_GEM_NWCTRL_MDEN_MASK 0x00000010 /* Enable MDIO port */
#define ZYNQ_GEM_NWCTRL_STARTTX_MASK 0x00000200 /* Start tx (tx_go) */
#define ZYNQ_GEM_NWCFG_SPEED100 0x000000001 /* 100 Mbps operation */
#define ZYNQ_GEM_NWCFG_SPEED1000 0x000000400 /* 1Gbps operation */
#define ZYNQ_GEM_NWCFG_FDEN 0x000000002 /* Full Duplex mode */
#define ZYNQ_GEM_NWCFG_FSREM 0x000020000 /* FCS removal */
#define ZYNQ_GEM_NWCFG_MDCCLKDIV 0x000080000 /* Div pclk by 32, 80MHz */
#define ZYNQ_GEM_NWCFG_MDCCLKDIV2 0x0000c0000 /* Div pclk by 48, 120MHz */
#ifdef CONFIG_ARM64
# define ZYNQ_GEM_DBUS_WIDTH (1 << 21) /* 64 bit bus */
#else
# define ZYNQ_GEM_DBUS_WIDTH (0 << 21) /* 32 bit bus */
#endif
#define ZYNQ_GEM_NWCFG_INIT (ZYNQ_GEM_DBUS_WIDTH | \
ZYNQ_GEM_NWCFG_FDEN | \
ZYNQ_GEM_NWCFG_FSREM | \
ZYNQ_GEM_NWCFG_MDCCLKDIV)
#define ZYNQ_GEM_NWSR_MDIOIDLE_MASK 0x00000004 /* PHY management idle */
#define ZYNQ_GEM_DMACR_BLENGTH 0x00000004 /* INCR4 AHB bursts */
/* Use full configured addressable space (8 Kb) */
#define ZYNQ_GEM_DMACR_RXSIZE 0x00000300
/* Use full configured addressable space (4 Kb) */
#define ZYNQ_GEM_DMACR_TXSIZE 0x00000400
/* Set with binary 00011000 to use 1536 byte(1*max length frame/buffer) */
#define ZYNQ_GEM_DMACR_RXBUF 0x00180000
#define ZYNQ_GEM_DMACR_INIT (ZYNQ_GEM_DMACR_BLENGTH | \
ZYNQ_GEM_DMACR_RXSIZE | \
ZYNQ_GEM_DMACR_TXSIZE | \
ZYNQ_GEM_DMACR_RXBUF)
/* 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
/* TX BD status masks */
#define ZYNQ_GEM_TXBUF_FRMLEN_MASK 0x000007ff
#define ZYNQ_GEM_TXBUF_EXHAUSTED 0x08000000
#define ZYNQ_GEM_TXBUF_UNDERRUN 0x10000000
/* Clock frequencies for different speeds */
#define ZYNQ_GEM_FREQUENCY_10 2500000UL
#define ZYNQ_GEM_FREQUENCY_100 25000000UL
#define ZYNQ_GEM_FREQUENCY_1000 125000000UL
/* Device registers */
struct zynq_gem_regs {
u32 nwctrl; /* Network Control reg */
u32 nwcfg; /* Network Config reg */
u32 nwsr; /* Network Status reg */
u32 reserved1;
u32 dmacr; /* DMA Control reg */
u32 txsr; /* TX Status reg */
u32 rxqbase; /* RX Q Base address reg */
u32 txqbase; /* TX Q Base address reg */
u32 rxsr; /* RX Status reg */
u32 reserved2[2];
u32 idr; /* Interrupt Disable reg */
u32 reserved3;
u32 phymntnc; /* Phy Maintaince reg */
u32 reserved4[18];
u32 hashl; /* Hash Low address reg */
u32 hashh; /* Hash High address reg */
#define LADDR_LOW 0
#define LADDR_HIGH 1
u32 laddr[4][LADDR_HIGH + 1]; /* Specific1 addr low/high reg */
u32 match[4]; /* Type ID1 Match reg */
u32 reserved6[18];
u32 stat[44]; /* Octects transmitted Low reg - stat start */
};
/* BD descriptors */
struct emac_bd {
u32 addr; /* Next descriptor pointer */
u32 status;
};
#define RX_BUF 32
/* Page table entries are set to 1MB, or multiples of 1MB
* (not < 1MB). driver uses less bd's so use 1MB bdspace.
*/
#define BD_SPACE 0x100000
/* BD separation space */
#define BD_SEPRN_SPACE 64
/* Initialized, rxbd_current, rx_first_buf must be 0 after init */
struct zynq_gem_priv {
struct emac_bd *tx_bd;
struct emac_bd *rx_bd;
char *rxbuffers;
u32 rxbd_current;
u32 rx_first_buf;
int phyaddr;
u32 emio;
int init;
struct phy_device *phydev;
struct mii_dev *bus;
};
static inline int mdio_wait(struct eth_device *dev)
{
struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase;
u32 timeout = 20000;
/* Wait till MDIO interface is ready to accept a new transaction. */
while (--timeout) {
if (readl(&regs->nwsr) & ZYNQ_GEM_NWSR_MDIOIDLE_MASK)
break;
WATCHDOG_RESET();
}
if (!timeout) {
printf("%s: Timeout\n", __func__);
return 1;
}
return 0;
}
static u32 phy_setup_op(struct eth_device *dev, u32 phy_addr, u32 regnum,
u32 op, u16 *data)
{
u32 mgtcr;
struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase;
if (mdio_wait(dev))
return 1;
/* Construct mgtcr mask for the operation */
mgtcr = ZYNQ_GEM_PHYMNTNC_OP_MASK | op |
(phy_addr << ZYNQ_GEM_PHYMNTNC_PHYAD_SHIFT_MASK) |
(regnum << ZYNQ_GEM_PHYMNTNC_PHREG_SHIFT_MASK) | *data;
/* Write mgtcr and wait for completion */
writel(mgtcr, &regs->phymntnc);
if (mdio_wait(dev))
return 1;
if (op == ZYNQ_GEM_PHYMNTNC_OP_R_MASK)
*data = readl(&regs->phymntnc);
return 0;
}
static u32 phyread(struct eth_device *dev, u32 phy_addr, u32 regnum, u16 *val)
{
return phy_setup_op(dev, phy_addr, regnum,
ZYNQ_GEM_PHYMNTNC_OP_R_MASK, val);
}
static u32 phywrite(struct eth_device *dev, u32 phy_addr, u32 regnum, u16 data)
{
return phy_setup_op(dev, phy_addr, regnum,
ZYNQ_GEM_PHYMNTNC_OP_W_MASK, &data);
}
static void phy_detection(struct eth_device *dev)
{
int i;
u16 phyreg;
struct zynq_gem_priv *priv = dev->priv;
if (priv->phyaddr != -1) {
phyread(dev, priv->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",
priv->phyaddr);
return;
} else {
debug("PHY address is not setup correctly %d\n",
priv->phyaddr);
priv->phyaddr = -1;
}
}
debug("detecting phy address\n");
if (priv->phyaddr == -1) {
/* detect the PHY address */
for (i = 31; i >= 0; i--) {
phyread(dev, i, PHY_DETECT_REG, &phyreg);
if ((phyreg != 0xFFFF) &&
((phyreg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) {
/* Found a valid PHY address */
priv->phyaddr = i;
debug("Found valid phy address, %d\n", i);
return;
}
}
}
printf("PHY is not detected\n");
}
static int zynq_gem_setup_mac(struct eth_device *dev)
{
u32 i, macaddrlow, macaddrhigh;
struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase;
/* Set the MAC bits [31:0] in BOT */
macaddrlow = dev->enetaddr[0];
macaddrlow |= dev->enetaddr[1] << 8;
macaddrlow |= dev->enetaddr[2] << 16;
macaddrlow |= dev->enetaddr[3] << 24;
/* Set MAC bits [47:32] in TOP */
macaddrhigh = dev->enetaddr[4];
macaddrhigh |= dev->enetaddr[5] << 8;
for (i = 0; i < 4; i++) {
writel(0, &regs->laddr[i][LADDR_LOW]);
writel(0, &regs->laddr[i][LADDR_HIGH]);
/* Do not use MATCHx register */
writel(0, &regs->match[i]);
}
writel(macaddrlow, &regs->laddr[0][LADDR_LOW]);
writel(macaddrhigh, &regs->laddr[0][LADDR_HIGH]);
return 0;
}
static int zynq_gem_init(struct eth_device *dev, bd_t * bis)
{
u32 i;
unsigned long clk_rate = 0;
struct phy_device *phydev;
const u32 stat_size = (sizeof(struct zynq_gem_regs) -
offsetof(struct zynq_gem_regs, stat)) / 4;
struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase;
struct zynq_gem_priv *priv = dev->priv;
const u32 supported = SUPPORTED_10baseT_Half |
SUPPORTED_10baseT_Full |
SUPPORTED_100baseT_Half |
SUPPORTED_100baseT_Full |
SUPPORTED_1000baseT_Half |
SUPPORTED_1000baseT_Full;
if (!priv->init) {
/* Disable all interrupts */
writel(0xFFFFFFFF, &regs->idr);
/* Disable the receiver & transmitter */
writel(0, &regs->nwctrl);
writel(0, &regs->txsr);
writel(0, &regs->rxsr);
writel(0, &regs->phymntnc);
/* Clear the Hash registers for the mac address
* pointed by AddressPtr
*/
writel(0x0, &regs->hashl);
/* Write bits [63:32] in TOP */
writel(0x0, &regs->hashh);
/* Clear all counters */
for (i = 0; i <= stat_size; i++)
readl(&regs->stat[i]);
/* Setup RxBD space */
memset(priv->rx_bd, 0, RX_BUF * sizeof(struct emac_bd));
for (i = 0; i < RX_BUF; i++) {
priv->rx_bd[i].status = 0xF0000000;
priv->rx_bd[i].addr =
((u32)(priv->rxbuffers) +
(i * PKTSIZE_ALIGN));
}
/* WRAP bit to last BD */
priv->rx_bd[--i].addr |= ZYNQ_GEM_RXBUF_WRAP_MASK;
/* Write RxBDs to IP */
writel((u32)priv->rx_bd, &regs->rxqbase);
/* Setup for DMA Configuration register */
writel(ZYNQ_GEM_DMACR_INIT, &regs->dmacr);
/* Setup for Network Control register, MDIO, Rx and Tx enable */
setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_MDEN_MASK);
priv->init++;
}
phy_detection(dev);
/* interface - look at tsec */
phydev = phy_connect(priv->bus, priv->phyaddr, dev,
PHY_INTERFACE_MODE_MII);
phydev->supported = supported | ADVERTISED_Pause |
ADVERTISED_Asym_Pause;
phydev->advertising = phydev->supported;
priv->phydev = phydev;
phy_config(phydev);
phy_startup(phydev);
if (!phydev->link) {
printf("%s: No link.\n", phydev->dev->name);
return -1;
}
switch (phydev->speed) {
case SPEED_1000:
writel(ZYNQ_GEM_NWCFG_INIT | ZYNQ_GEM_NWCFG_SPEED1000,
&regs->nwcfg);
clk_rate = ZYNQ_GEM_FREQUENCY_1000;
break;
case SPEED_100:
clrsetbits_le32(&regs->nwcfg, ZYNQ_GEM_NWCFG_SPEED1000,
ZYNQ_GEM_NWCFG_INIT | ZYNQ_GEM_NWCFG_SPEED100);
clk_rate = ZYNQ_GEM_FREQUENCY_100;
break;
case SPEED_10:
clk_rate = ZYNQ_GEM_FREQUENCY_10;
break;
}
/* Change the rclk and clk only not using EMIO interface */
if (!priv->emio)
zynq_slcr_gem_clk_setup(dev->iobase !=
ZYNQ_GEM_BASEADDR0, clk_rate);
setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_RXEN_MASK |
ZYNQ_GEM_NWCTRL_TXEN_MASK);
return 0;
}
static int zynq_gem_send(struct eth_device *dev, void *ptr, int len)
{
u32 addr, size;
struct zynq_gem_priv *priv = dev->priv;
struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase;
/* setup BD */
writel((u32)priv->tx_bd, &regs->txqbase);
/* Setup Tx BD */
memset(priv->tx_bd, 0, sizeof(struct emac_bd));
priv->tx_bd->addr = (u32)ptr;
priv->tx_bd->status = (len & ZYNQ_GEM_TXBUF_FRMLEN_MASK) |
ZYNQ_GEM_TXBUF_LAST_MASK |
ZYNQ_GEM_TXBUF_WRAP_MASK;
addr = (u32) ptr;
addr &= ~(ARCH_DMA_MINALIGN - 1);
size = roundup(len, ARCH_DMA_MINALIGN);
flush_dcache_range(addr, addr + size);
addr = (u32)priv->rxbuffers;
addr &= ~(ARCH_DMA_MINALIGN - 1);
size = roundup((RX_BUF * PKTSIZE_ALIGN), ARCH_DMA_MINALIGN);
flush_dcache_range(addr, addr + size);
barrier();
/* Start transmit */
setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_STARTTX_MASK);
/* Read TX BD status */
if (priv->tx_bd->status & ZYNQ_GEM_TXBUF_UNDERRUN)
printf("TX underrun\n");
if (priv->tx_bd->status & ZYNQ_GEM_TXBUF_EXHAUSTED)
printf("TX buffers exhausted in mid frame\n");
return 0;
}
/* Do not check frame_recd flag in rx_status register 0x20 - just poll BD */
static int zynq_gem_recv(struct eth_device *dev)
{
int frame_len;
struct zynq_gem_priv *priv = dev->priv;
struct emac_bd *current_bd = &priv->rx_bd[priv->rxbd_current];
struct emac_bd *first_bd;
if (!(current_bd->addr & ZYNQ_GEM_RXBUF_NEW_MASK))
return 0;
if (!(current_bd->status &
(ZYNQ_GEM_RXBUF_SOF_MASK | ZYNQ_GEM_RXBUF_EOF_MASK))) {
printf("GEM: SOF or EOF not set for last buffer received!\n");
return 0;
}
frame_len = current_bd->status & ZYNQ_GEM_RXBUF_LEN_MASK;
if (frame_len) {
u32 addr = current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK;
addr &= ~(ARCH_DMA_MINALIGN - 1);
net_process_received_packet((u8 *)addr, frame_len);
if (current_bd->status & ZYNQ_GEM_RXBUF_SOF_MASK)
priv->rx_first_buf = priv->rxbd_current;
else {
current_bd->addr &= ~ZYNQ_GEM_RXBUF_NEW_MASK;
current_bd->status = 0xF0000000; /* FIXME */
}
if (current_bd->status & ZYNQ_GEM_RXBUF_EOF_MASK) {
first_bd = &priv->rx_bd[priv->rx_first_buf];
first_bd->addr &= ~ZYNQ_GEM_RXBUF_NEW_MASK;
first_bd->status = 0xF0000000;
}
if ((++priv->rxbd_current) >= RX_BUF)
priv->rxbd_current = 0;
}
return frame_len;
}
static void zynq_gem_halt(struct eth_device *dev)
{
struct zynq_gem_regs *regs = (struct zynq_gem_regs *)dev->iobase;
clrsetbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_RXEN_MASK |
ZYNQ_GEM_NWCTRL_TXEN_MASK, 0);
}
static int zynq_gem_miiphyread(const char *devname, uchar addr,
uchar reg, ushort *val)
{
struct eth_device *dev = eth_get_dev();
int ret;
ret = phyread(dev, addr, reg, val);
debug("%s 0x%x, 0x%x, 0x%x\n", __func__, addr, reg, *val);
return ret;
}
static int zynq_gem_miiphy_write(const char *devname, uchar addr,
uchar reg, ushort val)
{
struct eth_device *dev = eth_get_dev();
debug("%s 0x%x, 0x%x, 0x%x\n", __func__, addr, reg, val);
return phywrite(dev, addr, reg, val);
}
int zynq_gem_initialize(bd_t *bis, phys_addr_t base_addr,
int phy_addr, u32 emio)
{
struct eth_device *dev;
struct zynq_gem_priv *priv;
void *bd_space;
dev = calloc(1, sizeof(*dev));
if (dev == NULL)
return -1;
dev->priv = calloc(1, sizeof(struct zynq_gem_priv));
if (dev->priv == NULL) {
free(dev);
return -1;
}
priv = dev->priv;
/* Align rxbuffers to ARCH_DMA_MINALIGN */
priv->rxbuffers = memalign(ARCH_DMA_MINALIGN, RX_BUF * PKTSIZE_ALIGN);
memset(priv->rxbuffers, 0, RX_BUF * PKTSIZE_ALIGN);
/* Align bd_space to MMU_SECTION_SHIFT */
bd_space = memalign(1 << MMU_SECTION_SHIFT, BD_SPACE);
mmu_set_region_dcache_behaviour((phys_addr_t)bd_space,
BD_SPACE, DCACHE_OFF);
/* Initialize the bd spaces for tx and rx bd's */
priv->tx_bd = (struct emac_bd *)bd_space;
priv->rx_bd = (struct emac_bd *)((u32)bd_space + BD_SEPRN_SPACE);
priv->phyaddr = phy_addr;
priv->emio = emio;
sprintf(dev->name, "Gem.%lx", base_addr);
dev->iobase = base_addr;
dev->init = zynq_gem_init;
dev->halt = zynq_gem_halt;
dev->send = zynq_gem_send;
dev->recv = zynq_gem_recv;
dev->write_hwaddr = zynq_gem_setup_mac;
eth_register(dev);
miiphy_register(dev->name, zynq_gem_miiphyread, zynq_gem_miiphy_write);
priv->bus = miiphy_get_dev_by_name(dev->name);
return 1;
}
#if CONFIG_IS_ENABLED(OF_CONTROL)
int zynq_gem_of_init(const void *blob)
{
int offset = 0;
u32 ret = 0;
u32 reg, phy_reg;
debug("ZYNQ GEM: Initialization\n");
do {
offset = fdt_node_offset_by_compatible(blob, offset,
"xlnx,ps7-ethernet-1.00.a");
if (offset != -1) {
reg = fdtdec_get_addr(blob, offset, "reg");
if (reg != FDT_ADDR_T_NONE) {
offset = fdtdec_lookup_phandle(blob, offset,
"phy-handle");
if (offset != -1)
phy_reg = fdtdec_get_addr(blob, offset,
"reg");
else
phy_reg = 0;
debug("ZYNQ GEM: addr %x, phyaddr %x\n",
reg, phy_reg);
ret |= zynq_gem_initialize(NULL, reg,
phy_reg, 0);
} else {
debug("ZYNQ GEM: Can't get base address\n");
return -1;
}
}
} while (offset != -1);
return ret;
}
#endif