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u-boot/drivers/net/zynq_gem.c
Venkatesh Yadav Abbarapu 22836f088d net: zynq_gem: Don't hardcode the MDC clock divisor 
As per spec MDC must not exceed 2.5MHz, read the pclk clock
from the device tree and update the MDC clock divisor.
GEM devices support larger clock divisors and have a different
range of divisors.  Program the MDIO clock divisors based on
the clock rate of the pclk clock.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@amd.com>
Link: https://lore.kernel.org/r/20230619034922.24019-1-venkatesh.abbarapu@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
2023-07-21 09:00:38 +02:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2011 Michal Simek
*
* Michal SIMEK <monstr@monstr.eu>
*
* Based on Xilinx gmac driver:
* (C) Copyright 2011 Xilinx
*/
#include <clk.h>
#include <common.h>
#include <cpu_func.h>
#include <dm.h>
#include <generic-phy.h>
#include <log.h>
#include <net.h>
#include <netdev.h>
#include <config.h>
#include <console.h>
#include <malloc.h>
#include <asm/cache.h>
#include <asm/io.h>
#include <phy.h>
#include <reset.h>
#include <miiphy.h>
#include <wait_bit.h>
#include <watchdog.h>
#include <asm/system.h>
#include <asm/arch/hardware.h>
#include <asm/arch/sys_proto.h>
#include <dm/device_compat.h>
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <eth_phy.h>
#include <zynqmp_firmware.h>
/* 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_TXBUF_USED_MASK 0x80000000 /* Used by Hw */
#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 0x00000001 /* 100 Mbps operation */
#define ZYNQ_GEM_NWCFG_SPEED1000 0x00000400 /* 1Gbps operation */
#define ZYNQ_GEM_NWCFG_FDEN 0x00000002 /* Full Duplex mode */
#define ZYNQ_GEM_NWCFG_FSREM 0x00020000 /* FCS removal */
#define ZYNQ_GEM_NWCFG_SGMII_ENBL 0x08000000 /* SGMII Enable */
#define ZYNQ_GEM_NWCFG_PCS_SEL 0x00000800 /* PCS select */
#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)
#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
#if defined(CONFIG_PHYS_64BIT)
# define ZYNQ_GEM_DMA_BUS_WIDTH BIT(30) /* 64 bit bus */
#else
# define ZYNQ_GEM_DMA_BUS_WIDTH (0 << 30) /* 32 bit bus */
#endif
#define ZYNQ_GEM_DMACR_INIT (ZYNQ_GEM_DMACR_BLENGTH | \
ZYNQ_GEM_DMACR_RXSIZE | \
ZYNQ_GEM_DMACR_TXSIZE | \
ZYNQ_GEM_DMACR_RXBUF | \
ZYNQ_GEM_DMA_BUS_WIDTH)
#define ZYNQ_GEM_TSR_DONE 0x00000020 /* Tx done mask */
#define ZYNQ_GEM_PCS_CTL_ANEG_ENBL 0x1000
#define ZYNQ_GEM_DCFG_DBG6_DMA_64B BIT(23)
#define MDIO_IDLE_TIMEOUT_MS 100
/* 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
/* PCS (SGMII) Link Status */
#define ZYNQ_GEM_PCSSTATUS_LINK BIT(2)
#define ZYNQ_GEM_PCSSTATUS_ANEG_COMPL BIT(5)
/* 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
#define RXCLK_EN BIT(0)
/* GEM specific constants for CLK. */
#define GEM_CLK_DIV8 0
#define GEM_CLK_DIV16 1
#define GEM_CLK_DIV32 2
#define GEM_CLK_DIV48 3
#define GEM_CLK_DIV64 4
#define GEM_CLK_DIV96 5
#define GEM_CLK_DIV128 6
#define GEM_CLK_DIV224 7
#define GEM_MDC_SET(val) FIELD_PREP(GENMASK(20, 18), val)
/* Device registers */
struct zynq_gem_regs {
u32 nwctrl; /* 0x0 - Network Control reg */
u32 nwcfg; /* 0x4 - Network Config reg */
u32 nwsr; /* 0x8 - Network Status reg */
u32 reserved1;
u32 dmacr; /* 0x10 - DMA Control reg */
u32 txsr; /* 0x14 - TX Status reg */
u32 rxqbase; /* 0x18 - RX Q Base address reg */
u32 txqbase; /* 0x1c - TX Q Base address reg */
u32 rxsr; /* 0x20 - RX Status reg */
u32 reserved2[2];
u32 idr; /* 0x2c - Interrupt Disable reg */
u32 reserved3;
u32 phymntnc; /* 0x34 - Phy Maintaince reg */
u32 reserved4[18];
u32 hashl; /* 0x80 - Hash Low address reg */
u32 hashh; /* 0x84 - Hash High address reg */
#define LADDR_LOW 0
#define LADDR_HIGH 1
u32 laddr[4][LADDR_HIGH + 1]; /* 0x8c - Specific1 addr low/high reg */
u32 match[4]; /* 0xa8 - Type ID1 Match reg */
u32 reserved6[18];
#define STAT_SIZE 44
u32 stat[STAT_SIZE]; /* 0x100 - Octects transmitted Low reg */
u32 reserved9[20];
u32 pcscntrl;
u32 pcsstatus;
u32 rserved12[35];
u32 dcfg6; /* 0x294 Design config reg6 */
u32 reserved7[106];
u32 transmit_q1_ptr; /* 0x440 - Transmit priority queue 1 */
u32 reserved8[15];
u32 receive_q1_ptr; /* 0x480 - Receive priority queue 1 */
u32 reserved10[17];
u32 upper_txqbase; /* 0x4C8 - Upper tx_q base addr */
u32 reserved11[2];
u32 upper_rxqbase; /* 0x4D4 - Upper rx_q base addr */
};
/* BD descriptors */
struct emac_bd {
u32 addr; /* Next descriptor pointer */
u32 status;
#if defined(CONFIG_PHYS_64BIT)
u32 addr_hi;
u32 reserved;
#endif
};
/* Reduce amount of BUFs if you have limited amount of memory */
#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 (RX_BUF * sizeof(struct emac_bd))
/* Setup the first free TX descriptor */
#define TX_FREE_DESC 2
/* 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;
int init;
struct zynq_gem_regs *iobase;
struct zynq_gem_regs *mdiobase;
phy_interface_t interface;
struct phy_device *phydev;
ofnode phy_of_node;
struct mii_dev *bus;
struct clk rx_clk;
struct clk tx_clk;
struct clk pclk;
u32 max_speed;
bool int_pcs;
bool dma_64bit;
u32 clk_en_info;
struct reset_ctl_bulk resets;
};
static int phy_setup_op(struct zynq_gem_priv *priv, u32 phy_addr, u32 regnum,
u32 op, u16 *data)
{
u32 mgtcr;
struct zynq_gem_regs *regs = priv->mdiobase;
int err;
err = wait_for_bit_le32(&regs->nwsr, ZYNQ_GEM_NWSR_MDIOIDLE_MASK,
true, MDIO_IDLE_TIMEOUT_MS, false);
if (err)
return err;
/* 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);
err = wait_for_bit_le32(&regs->nwsr, ZYNQ_GEM_NWSR_MDIOIDLE_MASK,
true, MDIO_IDLE_TIMEOUT_MS, false);
if (err)
return err;
if (op == ZYNQ_GEM_PHYMNTNC_OP_R_MASK)
*data = readl(&regs->phymntnc);
return 0;
}
static int phyread(struct zynq_gem_priv *priv, u32 phy_addr,
u32 regnum, u16 *val)
{
int ret;
ret = phy_setup_op(priv, phy_addr, regnum,
ZYNQ_GEM_PHYMNTNC_OP_R_MASK, val);
if (!ret)
debug("%s: phy_addr %d, regnum 0x%x, val 0x%x\n", __func__,
phy_addr, regnum, *val);
return ret;
}
static int phywrite(struct zynq_gem_priv *priv, u32 phy_addr,
u32 regnum, u16 data)
{
debug("%s: phy_addr %d, regnum 0x%x, data 0x%x\n", __func__, phy_addr,
regnum, data);
return phy_setup_op(priv, phy_addr, regnum,
ZYNQ_GEM_PHYMNTNC_OP_W_MASK, &data);
}
static int zynq_gem_setup_mac(struct udevice *dev)
{
u32 i, macaddrlow, macaddrhigh;
struct eth_pdata *pdata = dev_get_plat(dev);
struct zynq_gem_priv *priv = dev_get_priv(dev);
struct zynq_gem_regs *regs = priv->iobase;
/* Set the MAC bits [31:0] in BOT */
macaddrlow = pdata->enetaddr[0];
macaddrlow |= pdata->enetaddr[1] << 8;
macaddrlow |= pdata->enetaddr[2] << 16;
macaddrlow |= pdata->enetaddr[3] << 24;
/* Set MAC bits [47:32] in TOP */
macaddrhigh = pdata->enetaddr[4];
macaddrhigh |= pdata->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_phy_init(struct udevice *dev)
{
int ret;
struct zynq_gem_priv *priv = dev_get_priv(dev);
struct zynq_gem_regs *regs_mdio = priv->mdiobase;
const u32 supported = SUPPORTED_10baseT_Half |
SUPPORTED_10baseT_Full |
SUPPORTED_100baseT_Half |
SUPPORTED_100baseT_Full |
SUPPORTED_1000baseT_Half |
SUPPORTED_1000baseT_Full;
/* Enable only MDIO bus */
writel(ZYNQ_GEM_NWCTRL_MDEN_MASK, &regs_mdio->nwctrl);
if (IS_ENABLED(CONFIG_DM_ETH_PHY))
priv->phyaddr = eth_phy_get_addr(dev);
priv->phydev = phy_connect(priv->bus, priv->phyaddr, dev,
priv->interface);
if (IS_ERR_OR_NULL(priv->phydev))
return -ENODEV;
if (priv->max_speed) {
ret = phy_set_supported(priv->phydev, priv->max_speed);
if (ret)
return ret;
}
priv->phydev->supported &= supported | ADVERTISED_Pause |
ADVERTISED_Asym_Pause;
priv->phydev->advertising = priv->phydev->supported;
if (!ofnode_valid(priv->phydev->node))
priv->phydev->node = priv->phy_of_node;
return phy_config(priv->phydev);
}
static u32 gem_mdc_clk_div(struct zynq_gem_priv *priv)
{
u32 config;
unsigned long pclk_hz;
pclk_hz = clk_get_rate(&priv->pclk);
if (pclk_hz <= 20000000)
config = GEM_MDC_SET(GEM_CLK_DIV8);
else if (pclk_hz <= 40000000)
config = GEM_MDC_SET(GEM_CLK_DIV16);
else if (pclk_hz <= 80000000)
config = GEM_MDC_SET(GEM_CLK_DIV32);
else if (pclk_hz <= 120000000)
config = GEM_MDC_SET(GEM_CLK_DIV48);
else if (pclk_hz <= 160000000)
config = GEM_MDC_SET(GEM_CLK_DIV64);
else if (pclk_hz <= 240000000)
config = GEM_MDC_SET(GEM_CLK_DIV96);
else if (pclk_hz <= 320000000)
config = GEM_MDC_SET(GEM_CLK_DIV128);
else
config = GEM_MDC_SET(GEM_CLK_DIV224);
return config;
}
static int zynq_gem_init(struct udevice *dev)
{
u32 i, nwconfig;
int ret;
unsigned long clk_rate = 0;
struct zynq_gem_priv *priv = dev_get_priv(dev);
struct zynq_gem_regs *regs = priv->iobase;
struct zynq_gem_regs *regs_mdio = priv->mdiobase;
struct emac_bd *dummy_tx_bd = &priv->tx_bd[TX_FREE_DESC];
struct emac_bd *dummy_rx_bd = &priv->tx_bd[TX_FREE_DESC + 2];
if (readl(&regs->dcfg6) & ZYNQ_GEM_DCFG_DBG6_DMA_64B)
priv->dma_64bit = true;
else
priv->dma_64bit = false;
#if defined(CONFIG_PHYS_64BIT)
if (!priv->dma_64bit) {
printf("ERR: %s: Using 64-bit DMA but HW doesn't support it\n",
__func__);
return -EINVAL;
}
#else
if (priv->dma_64bit)
debug("WARN: %s: Not using 64-bit dma even HW supports it\n",
__func__);
#endif
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 =
(lower_32_bits((ulong)(priv->rxbuffers)
+ (i * PKTSIZE_ALIGN)));
#if defined(CONFIG_PHYS_64BIT)
priv->rx_bd[i].addr_hi =
(upper_32_bits((ulong)(priv->rxbuffers)
+ (i * PKTSIZE_ALIGN)));
#endif
}
/* WRAP bit to last BD */
priv->rx_bd[--i].addr |= ZYNQ_GEM_RXBUF_WRAP_MASK;
/* Write RxBDs to IP */
writel(lower_32_bits((ulong)priv->rx_bd), &regs->rxqbase);
#if defined(CONFIG_PHYS_64BIT)
writel(upper_32_bits((ulong)priv->rx_bd), &regs->upper_rxqbase);
#endif
/* 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_mdio->nwctrl, ZYNQ_GEM_NWCTRL_MDEN_MASK);
/* Disable the second priority queue */
dummy_tx_bd->addr = 0;
#if defined(CONFIG_PHYS_64BIT)
dummy_tx_bd->addr_hi = 0;
#endif
dummy_tx_bd->status = ZYNQ_GEM_TXBUF_WRAP_MASK |
ZYNQ_GEM_TXBUF_LAST_MASK|
ZYNQ_GEM_TXBUF_USED_MASK;
dummy_rx_bd->addr = ZYNQ_GEM_RXBUF_WRAP_MASK |
ZYNQ_GEM_RXBUF_NEW_MASK;
#if defined(CONFIG_PHYS_64BIT)
dummy_rx_bd->addr_hi = 0;
#endif
dummy_rx_bd->status = 0;
writel((ulong)dummy_tx_bd, &regs->transmit_q1_ptr);
writel((ulong)dummy_rx_bd, &regs->receive_q1_ptr);
priv->init++;
}
ret = phy_startup(priv->phydev);
if (ret)
return ret;
if (!priv->phydev->link) {
printf("%s: No link.\n", priv->phydev->dev->name);
return -1;
}
nwconfig = gem_mdc_clk_div(priv);
nwconfig |= ZYNQ_GEM_NWCFG_INIT;
/*
* Set SGMII enable PCS selection only if internal PCS/PMA
* core is used and interface is SGMII.
*/
if (priv->interface == PHY_INTERFACE_MODE_SGMII &&
priv->int_pcs) {
nwconfig |= ZYNQ_GEM_NWCFG_SGMII_ENBL |
ZYNQ_GEM_NWCFG_PCS_SEL;
}
switch (priv->phydev->speed) {
case SPEED_1000:
writel(nwconfig | ZYNQ_GEM_NWCFG_SPEED1000,
&regs->nwcfg);
clk_rate = ZYNQ_GEM_FREQUENCY_1000;
break;
case SPEED_100:
writel(nwconfig | ZYNQ_GEM_NWCFG_SPEED100,
&regs->nwcfg);
clk_rate = ZYNQ_GEM_FREQUENCY_100;
break;
case SPEED_10:
clk_rate = ZYNQ_GEM_FREQUENCY_10;
break;
}
#ifdef CONFIG_ARM64
if (priv->interface == PHY_INTERFACE_MODE_SGMII &&
priv->int_pcs) {
/*
* Disable AN for fixed link configuration, enable otherwise.
* Must be written after PCS_SEL is set in nwconfig,
* otherwise writes will not take effect.
*/
if (priv->phydev->phy_id != PHY_FIXED_ID) {
writel(readl(&regs->pcscntrl) | ZYNQ_GEM_PCS_CTL_ANEG_ENBL,
&regs->pcscntrl);
/*
* When the PHY link is already up, the PCS link needs
* to get re-checked
*/
if (priv->phydev->link) {
u32 pcsstatus;
pcsstatus = ZYNQ_GEM_PCSSTATUS_LINK |
ZYNQ_GEM_PCSSTATUS_ANEG_COMPL;
ret = wait_for_bit_le32(&regs->pcsstatus,
pcsstatus,
true, 5000, true);
if (ret) {
dev_warn(dev,
"no PCS (SGMII) link\n");
} else {
/*
* Some additional minimal delay seems
* to be needed so that the first
* packet will be sent correctly
*/
mdelay(1);
}
}
} else {
writel(readl(&regs->pcscntrl) & ~ZYNQ_GEM_PCS_CTL_ANEG_ENBL,
&regs->pcscntrl);
}
}
#endif
ret = clk_get_rate(&priv->tx_clk);
if (ret != clk_rate) {
ret = clk_set_rate(&priv->tx_clk, clk_rate);
if (IS_ERR_VALUE(ret)) {
dev_err(dev, "failed to set tx clock rate %ld\n", clk_rate);
return ret;
}
}
ret = clk_enable(&priv->tx_clk);
if (ret) {
dev_err(dev, "failed to enable tx clock\n");
return ret;
}
if (priv->clk_en_info & RXCLK_EN) {
ret = clk_enable(&priv->rx_clk);
if (ret) {
dev_err(dev, "failed to enable rx clock\n");
return ret;
}
}
setbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_RXEN_MASK |
ZYNQ_GEM_NWCTRL_TXEN_MASK);
return 0;
}
static int zynq_gem_send(struct udevice *dev, void *ptr, int len)
{
dma_addr_t addr;
u32 size;
struct zynq_gem_priv *priv = dev_get_priv(dev);
struct zynq_gem_regs *regs = priv->iobase;
struct emac_bd *current_bd = &priv->tx_bd[1];
/* Setup Tx BD */
memset(priv->tx_bd, 0, sizeof(struct emac_bd));
priv->tx_bd->addr = lower_32_bits((ulong)ptr);
#if defined(CONFIG_PHYS_64BIT)
priv->tx_bd->addr_hi = upper_32_bits((ulong)ptr);
#endif
priv->tx_bd->status = (len & ZYNQ_GEM_TXBUF_FRMLEN_MASK) |
ZYNQ_GEM_TXBUF_LAST_MASK;
/* Dummy descriptor to mark it as the last in descriptor chain */
current_bd->addr = 0x0;
#if defined(CONFIG_PHYS_64BIT)
current_bd->addr_hi = 0x0;
#endif
current_bd->status = ZYNQ_GEM_TXBUF_WRAP_MASK |
ZYNQ_GEM_TXBUF_LAST_MASK|
ZYNQ_GEM_TXBUF_USED_MASK;
/* setup BD */
writel(lower_32_bits((ulong)priv->tx_bd), &regs->txqbase);
#if defined(CONFIG_PHYS_64BIT)
writel(upper_32_bits((ulong)priv->tx_bd), &regs->upper_txqbase);
#endif
addr = (ulong) ptr;
addr &= ~(ARCH_DMA_MINALIGN - 1);
size = roundup(len, 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_EXHAUSTED)
printf("TX buffers exhausted in mid frame\n");
return wait_for_bit_le32(&regs->txsr, ZYNQ_GEM_TSR_DONE,
true, 20000, true);
}
/* Do not check frame_recd flag in rx_status register 0x20 - just poll BD */
static int zynq_gem_recv(struct udevice *dev, int flags, uchar **packetp)
{
int frame_len;
dma_addr_t addr;
struct zynq_gem_priv *priv = dev_get_priv(dev);
struct emac_bd *current_bd = &priv->rx_bd[priv->rxbd_current];
if (!(current_bd->addr & ZYNQ_GEM_RXBUF_NEW_MASK))
return -1;
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 -1;
}
frame_len = current_bd->status & ZYNQ_GEM_RXBUF_LEN_MASK;
if (!frame_len) {
printf("%s: Zero size packet?\n", __func__);
return -1;
}
#if defined(CONFIG_PHYS_64BIT)
addr = (dma_addr_t)((current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK)
| ((dma_addr_t)current_bd->addr_hi << 32));
#else
addr = current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK;
#endif
addr &= ~(ARCH_DMA_MINALIGN - 1);
*packetp = (uchar *)(uintptr_t)addr;
invalidate_dcache_range(addr, addr + roundup(PKTSIZE_ALIGN, ARCH_DMA_MINALIGN));
barrier();
return frame_len;
}
static int zynq_gem_free_pkt(struct udevice *dev, uchar *packet, int length)
{
struct zynq_gem_priv *priv = dev_get_priv(dev);
struct emac_bd *current_bd = &priv->rx_bd[priv->rxbd_current];
struct emac_bd *first_bd;
dma_addr_t addr;
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;
}
/* Flush the cache for the packet as well */
#if defined(CONFIG_PHYS_64BIT)
addr = (dma_addr_t)((current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK)
| ((dma_addr_t)current_bd->addr_hi << 32));
#else
addr = current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK;
#endif
flush_dcache_range(addr, addr + roundup(PKTSIZE_ALIGN,
ARCH_DMA_MINALIGN));
barrier();
if ((++priv->rxbd_current) >= RX_BUF)
priv->rxbd_current = 0;
return 0;
}
static void zynq_gem_halt(struct udevice *dev)
{
struct zynq_gem_priv *priv = dev_get_priv(dev);
struct zynq_gem_regs *regs = priv->iobase;
clrsetbits_le32(&regs->nwctrl, ZYNQ_GEM_NWCTRL_RXEN_MASK |
ZYNQ_GEM_NWCTRL_TXEN_MASK, 0);
}
static int zynq_gem_miiphy_read(struct mii_dev *bus, int addr,
int devad, int reg)
{
struct zynq_gem_priv *priv = bus->priv;
int ret;
u16 val = 0;
ret = phyread(priv, addr, reg, &val);
debug("%s 0x%x, 0x%x, 0x%x, 0x%x\n", __func__, addr, reg, val, ret);
return val;
}
static int zynq_gem_miiphy_write(struct mii_dev *bus, int addr, int devad,
int reg, u16 value)
{
struct zynq_gem_priv *priv = bus->priv;
debug("%s 0x%x, 0x%x, 0x%x\n", __func__, addr, reg, value);
return phywrite(priv, addr, reg, value);
}
static int zynq_gem_reset_init(struct udevice *dev)
{
struct zynq_gem_priv *priv = dev_get_priv(dev);
int ret;
ret = reset_get_bulk(dev, &priv->resets);
if (ret == -ENOTSUPP || ret == -ENOENT)
return 0;
else if (ret)
return ret;
ret = reset_deassert_bulk(&priv->resets);
if (ret) {
reset_release_bulk(&priv->resets);
return ret;
}
return 0;
}
static int gem_zynqmp_set_dynamic_config(struct udevice *dev)
{
u32 pm_info[2];
int ret;
if (IS_ENABLED(CONFIG_ARCH_ZYNQMP) && IS_ENABLED(CONFIG_ZYNQMP_FIRMWARE)) {
if (!zynqmp_pm_is_function_supported(PM_IOCTL,
IOCTL_SET_GEM_CONFIG)) {
ret = ofnode_read_u32_array(dev_ofnode(dev),
"power-domains",
pm_info,
ARRAY_SIZE(pm_info));
if (ret) {
dev_err(dev,
"Failed to read power-domains info\n");
return ret;
}
ret = zynqmp_pm_set_gem_config(pm_info[1],
GEM_CONFIG_FIXED, 0);
if (ret)
return ret;
ret = zynqmp_pm_set_gem_config(pm_info[1],
GEM_CONFIG_SGMII_MODE,
1);
if (ret)
return ret;
}
}
return 0;
}
static int zynq_gem_probe(struct udevice *dev)
{
void *bd_space;
struct zynq_gem_priv *priv = dev_get_priv(dev);
int ret;
struct phy phy;
if (priv->interface == PHY_INTERFACE_MODE_SGMII) {
ret = generic_phy_get_by_index(dev, 0, &phy);
if (!ret) {
ret = generic_phy_init(&phy);
if (ret)
return ret;
} else if (ret != -ENOENT) {
debug("could not get phy (err %d)\n", ret);
return ret;
}
}
ret = zynq_gem_reset_init(dev);
if (ret)
return ret;
/* Align rxbuffers to ARCH_DMA_MINALIGN */
priv->rxbuffers = memalign(ARCH_DMA_MINALIGN, RX_BUF * PKTSIZE_ALIGN);
if (!priv->rxbuffers)
return -ENOMEM;
memset(priv->rxbuffers, 0, RX_BUF * PKTSIZE_ALIGN);
ulong addr = (ulong)priv->rxbuffers;
flush_dcache_range(addr, addr + roundup(RX_BUF * PKTSIZE_ALIGN, ARCH_DMA_MINALIGN));
barrier();
/* Align bd_space to MMU_SECTION_SHIFT */
bd_space = memalign(1 << MMU_SECTION_SHIFT, BD_SPACE);
if (!bd_space) {
ret = -ENOMEM;
goto err1;
}
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 *)((ulong)bd_space + BD_SEPRN_SPACE);
ret = clk_get_by_name(dev, "tx_clk", &priv->tx_clk);
if (ret < 0) {
dev_err(dev, "failed to get tx_clock\n");
goto err2;
}
if (priv->clk_en_info & RXCLK_EN) {
ret = clk_get_by_name(dev, "rx_clk", &priv->rx_clk);
if (ret < 0) {
dev_err(dev, "failed to get rx_clock\n");
goto err2;
}
}
ret = clk_get_by_name(dev, "pclk", &priv->pclk);
if (ret < 0) {
dev_err(dev, "failed to get pclk clock\n");
goto err2;
}
if (IS_ENABLED(CONFIG_DM_ETH_PHY))
priv->bus = eth_phy_get_mdio_bus(dev);
if (!priv->bus) {
priv->bus = mdio_alloc();
priv->bus->read = zynq_gem_miiphy_read;
priv->bus->write = zynq_gem_miiphy_write;
priv->bus->priv = priv;
ret = mdio_register_seq(priv->bus, dev_seq(dev));
if (ret)
goto err2;
}
if (IS_ENABLED(CONFIG_DM_ETH_PHY))
eth_phy_set_mdio_bus(dev, priv->bus);
ret = zynq_phy_init(dev);
if (ret)
goto err3;
if (priv->interface == PHY_INTERFACE_MODE_SGMII && phy.dev) {
if (IS_ENABLED(CONFIG_DM_ETH_PHY)) {
if (device_is_compatible(dev, "cdns,zynqmp-gem") ||
device_is_compatible(dev, "xlnx,zynqmp-gem")) {
ret = gem_zynqmp_set_dynamic_config(dev);
if (ret) {
dev_err
(dev,
"Failed to set gem dynamic config\n");
return ret;
}
}
}
ret = generic_phy_power_on(&phy);
if (ret)
return ret;
}
printf("\nZYNQ GEM: %lx, mdio bus %lx, phyaddr %d, interface %s\n",
(ulong)priv->iobase, (ulong)priv->mdiobase, priv->phydev->addr,
phy_string_for_interface(priv->interface));
return ret;
err3:
mdio_unregister(priv->bus);
err2:
free(priv->tx_bd);
err1:
free(priv->rxbuffers);
return ret;
}
static int zynq_gem_remove(struct udevice *dev)
{
struct zynq_gem_priv *priv = dev_get_priv(dev);
free(priv->phydev);
mdio_unregister(priv->bus);
mdio_free(priv->bus);
return 0;
}
static const struct eth_ops zynq_gem_ops = {
.start = zynq_gem_init,
.send = zynq_gem_send,
.recv = zynq_gem_recv,
.free_pkt = zynq_gem_free_pkt,
.stop = zynq_gem_halt,
.write_hwaddr = zynq_gem_setup_mac,
};
static int zynq_gem_of_to_plat(struct udevice *dev)
{
struct eth_pdata *pdata = dev_get_plat(dev);
struct zynq_gem_priv *priv = dev_get_priv(dev);
struct ofnode_phandle_args phandle_args;
pdata->iobase = (phys_addr_t)dev_read_addr(dev);
priv->iobase = (struct zynq_gem_regs *)pdata->iobase;
priv->mdiobase = priv->iobase;
/* Hardcode for now */
priv->phyaddr = -1;
if (!dev_read_phandle_with_args(dev, "phy-handle", NULL, 0, 0,
&phandle_args)) {
fdt_addr_t addr;
ofnode parent;
debug("phy-handle does exist %s\n", dev->name);
if (!(IS_ENABLED(CONFIG_DM_ETH_PHY)))
priv->phyaddr = ofnode_read_u32_default
(phandle_args.node, "reg", -1);
priv->phy_of_node = phandle_args.node;
priv->max_speed = ofnode_read_u32_default(phandle_args.node,
"max-speed",
SPEED_1000);
parent = ofnode_get_parent(phandle_args.node);
if (ofnode_name_eq(parent, "mdio"))
parent = ofnode_get_parent(parent);
addr = ofnode_get_addr(parent);
if (addr != FDT_ADDR_T_NONE) {
debug("MDIO bus not found %s\n", dev->name);
priv->mdiobase = (struct zynq_gem_regs *)addr;
}
}
pdata->phy_interface = dev_read_phy_mode(dev);
if (pdata->phy_interface == PHY_INTERFACE_MODE_NA)
return -EINVAL;
priv->interface = pdata->phy_interface;
priv->int_pcs = dev_read_bool(dev, "is-internal-pcspma");
priv->clk_en_info = dev_get_driver_data(dev);
return 0;
}
static const struct udevice_id zynq_gem_ids[] = {
{ .compatible = "xlnx,versal-gem", .data = RXCLK_EN },
{ .compatible = "cdns,versal-gem", .data = RXCLK_EN },
{ .compatible = "xlnx,zynqmp-gem" },
{ .compatible = "cdns,zynqmp-gem" },
{ .compatible = "xlnx,zynq-gem" },
{ .compatible = "cdns,zynq-gem" },
{ .compatible = "cdns,gem" },
{ }
};
U_BOOT_DRIVER(zynq_gem) = {
.name = "zynq_gem",
.id = UCLASS_ETH,
.of_match = zynq_gem_ids,
.of_to_plat = zynq_gem_of_to_plat,
.probe = zynq_gem_probe,
.remove = zynq_gem_remove,
.ops = &zynq_gem_ops,
.priv_auto = sizeof(struct zynq_gem_priv),
.plat_auto = sizeof(struct eth_pdata),
};
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