u-boot/drivers/net/pch_gbe.c

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/*
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
*
* Intel Platform Controller Hub EG20T (codename Topcliff) GMAC Driver
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <asm/io.h>
#include <pci.h>
#include <miiphy.h>
#include "pch_gbe.h"
#if !defined(CONFIG_PHYLIB)
# error "PCH Gigabit Ethernet driver requires PHYLIB - missing CONFIG_PHYLIB"
#endif
static struct pci_device_id supported[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_TCF_GBE) },
{ }
};
static void pch_gbe_mac_read(struct pch_gbe_regs *mac_regs, u8 *addr)
{
u32 macid_hi, macid_lo;
macid_hi = readl(&mac_regs->mac_adr[0].high);
macid_lo = readl(&mac_regs->mac_adr[0].low) & 0xffff;
debug("pch_gbe: macid_hi %#x macid_lo %#x\n", macid_hi, macid_lo);
addr[0] = (u8)(macid_hi & 0xff);
addr[1] = (u8)((macid_hi >> 8) & 0xff);
addr[2] = (u8)((macid_hi >> 16) & 0xff);
addr[3] = (u8)((macid_hi >> 24) & 0xff);
addr[4] = (u8)(macid_lo & 0xff);
addr[5] = (u8)((macid_lo >> 8) & 0xff);
}
static int pch_gbe_mac_write(struct pch_gbe_regs *mac_regs, u8 *addr)
{
u32 macid_hi, macid_lo;
ulong start;
macid_hi = addr[0] + (addr[1] << 8) + (addr[2] << 16) + (addr[3] << 24);
macid_lo = addr[4] + (addr[5] << 8);
writel(macid_hi, &mac_regs->mac_adr[0].high);
writel(macid_lo, &mac_regs->mac_adr[0].low);
writel(0xfffe, &mac_regs->addr_mask);
start = get_timer(0);
while (get_timer(start) < PCH_GBE_TIMEOUT) {
if (!(readl(&mac_regs->addr_mask) & PCH_GBE_BUSY))
return 0;
udelay(10);
}
return -ETIME;
}
static int pch_gbe_reset(struct udevice *dev)
{
struct pch_gbe_priv *priv = dev_get_priv(dev);
struct eth_pdata *plat = dev_get_platdata(dev);
struct pch_gbe_regs *mac_regs = priv->mac_regs;
ulong start;
priv->rx_idx = 0;
priv->tx_idx = 0;
writel(PCH_GBE_ALL_RST, &mac_regs->reset);
/*
* Configure the MAC to RGMII mode after reset
*
* For some unknown reason, we must do the configuration here right
* after resetting the whole MAC, otherwise the reset bit in the RESET
* register will never be cleared by the hardware. And there is another
* way of having the same magic, that is to configure the MODE register
* to have the MAC work in MII/GMII mode, which is how current Linux
* pch_gbe driver does. Since anyway we need program the MAC to RGMII
* mode in the driver, we just do it here.
*
* Note: this behavior is not documented in the hardware manual.
*/
writel(PCH_GBE_RGMII_MODE_RGMII | PCH_GBE_CHIP_TYPE_INTERNAL,
&mac_regs->rgmii_ctrl);
start = get_timer(0);
while (get_timer(start) < PCH_GBE_TIMEOUT) {
if (!(readl(&mac_regs->reset) & PCH_GBE_ALL_RST)) {
/*
* Soft reset clears hardware MAC address registers,
* so we have to reload MAC address here in order to
* make linux pch_gbe driver happy.
*/
return pch_gbe_mac_write(mac_regs, plat->enetaddr);
}
udelay(10);
}
debug("pch_gbe: reset timeout\n");
return -ETIME;
}
static void pch_gbe_rx_descs_init(struct udevice *dev)
{
struct pch_gbe_priv *priv = dev_get_priv(dev);
struct pch_gbe_regs *mac_regs = priv->mac_regs;
struct pch_gbe_rx_desc *rx_desc = &priv->rx_desc[0];
int i;
memset(rx_desc, 0, sizeof(struct pch_gbe_rx_desc) * PCH_GBE_DESC_NUM);
for (i = 0; i < PCH_GBE_DESC_NUM; i++)
rx_desc->buffer_addr = dm_pci_phys_to_mem(priv->dev,
(u32)(priv->rx_buff[i]));
writel(dm_pci_phys_to_mem(priv->dev, (u32)rx_desc),
&mac_regs->rx_dsc_base);
writel(sizeof(struct pch_gbe_rx_desc) * (PCH_GBE_DESC_NUM - 1),
&mac_regs->rx_dsc_size);
writel(dm_pci_phys_to_mem(priv->dev, (u32)(rx_desc + 1)),
&mac_regs->rx_dsc_sw_p);
}
static void pch_gbe_tx_descs_init(struct udevice *dev)
{
struct pch_gbe_priv *priv = dev_get_priv(dev);
struct pch_gbe_regs *mac_regs = priv->mac_regs;
struct pch_gbe_tx_desc *tx_desc = &priv->tx_desc[0];
memset(tx_desc, 0, sizeof(struct pch_gbe_tx_desc) * PCH_GBE_DESC_NUM);
writel(dm_pci_phys_to_mem(priv->dev, (u32)tx_desc),
&mac_regs->tx_dsc_base);
writel(sizeof(struct pch_gbe_tx_desc) * (PCH_GBE_DESC_NUM - 1),
&mac_regs->tx_dsc_size);
writel(dm_pci_phys_to_mem(priv->dev, (u32)(tx_desc + 1)),
&mac_regs->tx_dsc_sw_p);
}
static void pch_gbe_adjust_link(struct pch_gbe_regs *mac_regs,
struct phy_device *phydev)
{
if (!phydev->link) {
printf("%s: No link.\n", phydev->dev->name);
return;
}
clrbits_le32(&mac_regs->rgmii_ctrl,
PCH_GBE_RGMII_RATE_2_5M | PCH_GBE_CRS_SEL);
clrbits_le32(&mac_regs->mode,
PCH_GBE_MODE_GMII_ETHER | PCH_GBE_MODE_FULL_DUPLEX);
switch (phydev->speed) {
case 1000:
setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_125M);
setbits_le32(&mac_regs->mode, PCH_GBE_MODE_GMII_ETHER);
break;
case 100:
setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_25M);
setbits_le32(&mac_regs->mode, PCH_GBE_MODE_MII_ETHER);
break;
case 10:
setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_2_5M);
setbits_le32(&mac_regs->mode, PCH_GBE_MODE_MII_ETHER);
break;
}
if (phydev->duplex) {
setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_CRS_SEL);
setbits_le32(&mac_regs->mode, PCH_GBE_MODE_FULL_DUPLEX);
}
printf("Speed: %d, %s duplex\n", phydev->speed,
(phydev->duplex) ? "full" : "half");
return;
}
static int pch_gbe_start(struct udevice *dev)
{
struct pch_gbe_priv *priv = dev_get_priv(dev);
struct pch_gbe_regs *mac_regs = priv->mac_regs;
if (pch_gbe_reset(dev))
return -1;
pch_gbe_rx_descs_init(dev);
pch_gbe_tx_descs_init(dev);
/* Enable frame bursting */
writel(PCH_GBE_MODE_FR_BST, &mac_regs->mode);
/* Disable TCP/IP accelerator */
writel(PCH_GBE_RX_TCPIPACC_OFF, &mac_regs->tcpip_acc);
/* Disable RX flow control */
writel(0, &mac_regs->rx_fctrl);
/* Configure RX/TX mode */
writel(PCH_GBE_RH_ALM_EMP_16 | PCH_GBE_RH_ALM_FULL_16 |
PCH_GBE_RH_RD_TRG_32, &mac_regs->rx_mode);
writel(PCH_GBE_TM_TH_TX_STRT_32 | PCH_GBE_TM_TH_ALM_EMP_16 |
PCH_GBE_TM_TH_ALM_FULL_32 | PCH_GBE_TM_ST_AND_FD |
PCH_GBE_TM_SHORT_PKT, &mac_regs->tx_mode);
/* Start up the PHY */
if (phy_startup(priv->phydev)) {
printf("Could not initialize PHY %s\n",
priv->phydev->dev->name);
return -1;
}
pch_gbe_adjust_link(mac_regs, priv->phydev);
if (!priv->phydev->link)
return -1;
/* Enable TX & RX */
writel(PCH_GBE_RX_DMA_EN | PCH_GBE_TX_DMA_EN, &mac_regs->dma_ctrl);
writel(PCH_GBE_MRE_MAC_RX_EN, &mac_regs->mac_rx_en);
return 0;
}
static void pch_gbe_stop(struct udevice *dev)
{
struct pch_gbe_priv *priv = dev_get_priv(dev);
pch_gbe_reset(dev);
phy_shutdown(priv->phydev);
}
static int pch_gbe_send(struct udevice *dev, void *packet, int length)
{
struct pch_gbe_priv *priv = dev_get_priv(dev);
struct pch_gbe_regs *mac_regs = priv->mac_regs;
struct pch_gbe_tx_desc *tx_head, *tx_desc;
u16 frame_ctrl = 0;
u32 int_st;
ulong start;
tx_head = &priv->tx_desc[0];
tx_desc = &priv->tx_desc[priv->tx_idx];
if (length < 64)
frame_ctrl |= PCH_GBE_TXD_CTRL_APAD;
tx_desc->buffer_addr = dm_pci_phys_to_mem(priv->dev, (u32)packet);
tx_desc->length = length;
tx_desc->tx_words_eob = length + 3;
tx_desc->tx_frame_ctrl = frame_ctrl;
tx_desc->dma_status = 0;
tx_desc->gbec_status = 0;
/* Test the wrap-around condition */
if (++priv->tx_idx >= PCH_GBE_DESC_NUM)
priv->tx_idx = 0;
writel(dm_pci_phys_to_mem(priv->dev, (u32)(tx_head + priv->tx_idx)),
&mac_regs->tx_dsc_sw_p);
start = get_timer(0);
while (get_timer(start) < PCH_GBE_TIMEOUT) {
int_st = readl(&mac_regs->int_st);
if (int_st & PCH_GBE_INT_TX_CMPLT)
return 0;
udelay(10);
}
debug("pch_gbe: sent failed\n");
return -ETIME;
}
static int pch_gbe_recv(struct udevice *dev, int flags, uchar **packetp)
{
struct pch_gbe_priv *priv = dev_get_priv(dev);
struct pch_gbe_regs *mac_regs = priv->mac_regs;
struct pch_gbe_rx_desc *rx_desc;
u32 hw_desc, buffer_addr, length;
rx_desc = &priv->rx_desc[priv->rx_idx];
readl(&mac_regs->int_st);
hw_desc = readl(&mac_regs->rx_dsc_hw_p_hld);
/* Just return if not receiving any packet */
if ((u32)rx_desc == hw_desc)
return -EAGAIN;
buffer_addr = dm_pci_mem_to_phys(priv->dev, rx_desc->buffer_addr);
*packetp = (uchar *)buffer_addr;
length = rx_desc->rx_words_eob - 3 - ETH_FCS_LEN;
return length;
}
static int pch_gbe_free_pkt(struct udevice *dev, uchar *packet, int length)
{
struct pch_gbe_priv *priv = dev_get_priv(dev);
struct pch_gbe_regs *mac_regs = priv->mac_regs;
struct pch_gbe_rx_desc *rx_head = &priv->rx_desc[0];
int rx_swp;
/* Test the wrap-around condition */
if (++priv->rx_idx >= PCH_GBE_DESC_NUM)
priv->rx_idx = 0;
rx_swp = priv->rx_idx;
if (++rx_swp >= PCH_GBE_DESC_NUM)
rx_swp = 0;
writel(dm_pci_phys_to_mem(priv->dev, (u32)(rx_head + rx_swp)),
&mac_regs->rx_dsc_sw_p);
return 0;
}
static int pch_gbe_mdio_ready(struct pch_gbe_regs *mac_regs)
{
ulong start = get_timer(0);
while (get_timer(start) < PCH_GBE_TIMEOUT) {
if (readl(&mac_regs->miim) & PCH_GBE_MIIM_OPER_READY)
return 0;
udelay(10);
}
return -ETIME;
}
static int pch_gbe_mdio_read(struct mii_dev *bus, int addr, int devad, int reg)
{
struct pch_gbe_regs *mac_regs = bus->priv;
u32 miim;
if (pch_gbe_mdio_ready(mac_regs))
return -ETIME;
miim = (addr << PCH_GBE_MIIM_PHY_ADDR_SHIFT) |
(reg << PCH_GBE_MIIM_REG_ADDR_SHIFT) |
PCH_GBE_MIIM_OPER_READ;
writel(miim, &mac_regs->miim);
if (pch_gbe_mdio_ready(mac_regs))
return -ETIME;
return readl(&mac_regs->miim) & 0xffff;
}
static int pch_gbe_mdio_write(struct mii_dev *bus, int addr, int devad,
int reg, u16 val)
{
struct pch_gbe_regs *mac_regs = bus->priv;
u32 miim;
if (pch_gbe_mdio_ready(mac_regs))
return -ETIME;
miim = (addr << PCH_GBE_MIIM_PHY_ADDR_SHIFT) |
(reg << PCH_GBE_MIIM_REG_ADDR_SHIFT) |
PCH_GBE_MIIM_OPER_WRITE | val;
writel(miim, &mac_regs->miim);
if (pch_gbe_mdio_ready(mac_regs))
return -ETIME;
else
return 0;
}
static int pch_gbe_mdio_init(const char *name, struct pch_gbe_regs *mac_regs)
{
struct mii_dev *bus;
bus = mdio_alloc();
if (!bus) {
debug("pch_gbe: failed to allocate MDIO bus\n");
return -ENOMEM;
}
bus->read = pch_gbe_mdio_read;
bus->write = pch_gbe_mdio_write;
strcpy(bus->name, name);
bus->priv = (void *)mac_regs;
return mdio_register(bus);
}
static int pch_gbe_phy_init(struct udevice *dev)
{
struct pch_gbe_priv *priv = dev_get_priv(dev);
struct eth_pdata *plat = dev_get_platdata(dev);
struct phy_device *phydev;
int mask = 0xffffffff;
phydev = phy_find_by_mask(priv->bus, mask, plat->phy_interface);
if (!phydev) {
printf("pch_gbe: cannot find the phy\n");
return -1;
}
phy_connect_dev(phydev, dev);
phydev->supported &= PHY_GBIT_FEATURES;
phydev->advertising = phydev->supported;
priv->phydev = phydev;
phy_config(phydev);
return 0;
}
int pch_gbe_probe(struct udevice *dev)
{
struct pch_gbe_priv *priv;
struct eth_pdata *plat = dev_get_platdata(dev);
u32 iobase;
/*
* The priv structure contains the descriptors and frame buffers which
* need a strict buswidth alignment (64 bytes). This is guaranteed by
* DM_FLAG_ALLOC_PRIV_DMA flag in the U_BOOT_DRIVER.
*/
priv = dev_get_priv(dev);
priv->dev = dev;
dm_pci_read_config32(dev, PCI_BASE_ADDRESS_1, &iobase);
iobase &= PCI_BASE_ADDRESS_MEM_MASK;
iobase = dm_pci_mem_to_phys(dev, iobase);
plat->iobase = iobase;
priv->mac_regs = (struct pch_gbe_regs *)iobase;
/* Read MAC address from SROM and initialize dev->enetaddr with it */
pch_gbe_mac_read(priv->mac_regs, plat->enetaddr);
plat->phy_interface = PHY_INTERFACE_MODE_RGMII;
pch_gbe_mdio_init(dev->name, priv->mac_regs);
priv->bus = miiphy_get_dev_by_name(dev->name);
return pch_gbe_phy_init(dev);
}
int pch_gbe_remove(struct udevice *dev)
{
struct pch_gbe_priv *priv = dev_get_priv(dev);
free(priv->phydev);
mdio_unregister(priv->bus);
mdio_free(priv->bus);
return 0;
}
static const struct eth_ops pch_gbe_ops = {
.start = pch_gbe_start,
.send = pch_gbe_send,
.recv = pch_gbe_recv,
.free_pkt = pch_gbe_free_pkt,
.stop = pch_gbe_stop,
};
static const struct udevice_id pch_gbe_ids[] = {
{ .compatible = "intel,pch-gbe" },
{ }
};
U_BOOT_DRIVER(eth_pch_gbe) = {
.name = "pch_gbe",
.id = UCLASS_ETH,
.of_match = pch_gbe_ids,
.probe = pch_gbe_probe,
.remove = pch_gbe_remove,
.ops = &pch_gbe_ops,
.priv_auto_alloc_size = sizeof(struct pch_gbe_priv),
.platdata_auto_alloc_size = sizeof(struct eth_pdata),
.flags = DM_FLAG_ALLOC_PRIV_DMA,
};
U_BOOT_PCI_DEVICE(eth_pch_gbe, supported);