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u-boot/drivers/net/ftmac110.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

489 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Faraday 10/100Mbps Ethernet Controller
*
* (C) Copyright 2013 Faraday Technology
* Dante Su <dantesu@faraday-tech.com>
*/
#include <common.h>
#include <command.h>
#include <malloc.h>
#include <net.h>
#include <linux/errno.h>
#include <asm/io.h>
#include <asm/dma-mapping.h>
#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
#include <miiphy.h>
#endif
#include "ftmac110.h"
#define CFG_RXDES_NUM 8
#define CFG_TXDES_NUM 2
#define CFG_XBUF_SIZE 1536
#define CFG_MDIORD_TIMEOUT (CONFIG_SYS_HZ >> 1) /* 500 ms */
#define CFG_MDIOWR_TIMEOUT (CONFIG_SYS_HZ >> 1) /* 500 ms */
#define CFG_LINKUP_TIMEOUT (CONFIG_SYS_HZ << 2) /* 4 sec */
/*
* FTMAC110 DMA design issue
*
* Its DMA engine has a weird restriction that its Rx DMA engine
* accepts only 16-bits aligned address, 32-bits aligned is not
* acceptable. However this restriction does not apply to Tx DMA.
*
* Conclusion:
* (1) Tx DMA Buffer Address:
* 1 bytes aligned: Invalid
* 2 bytes aligned: O.K
* 4 bytes aligned: O.K (-> u-boot ZeroCopy is possible)
* (2) Rx DMA Buffer Address:
* 1 bytes aligned: Invalid
* 2 bytes aligned: O.K
* 4 bytes aligned: Invalid
*/
struct ftmac110_chip {
void __iomem *regs;
uint32_t imr;
uint32_t maccr;
uint32_t lnkup;
uint32_t phy_addr;
struct ftmac110_desc *rxd;
ulong rxd_dma;
uint32_t rxd_idx;
struct ftmac110_desc *txd;
ulong txd_dma;
uint32_t txd_idx;
};
static int ftmac110_reset(struct eth_device *dev);
static uint16_t mdio_read(struct eth_device *dev,
uint8_t phyaddr, uint8_t phyreg)
{
struct ftmac110_chip *chip = dev->priv;
struct ftmac110_regs *regs = chip->regs;
uint32_t tmp, ts;
uint16_t ret = 0xffff;
tmp = PHYCR_READ
| (phyaddr << PHYCR_ADDR_SHIFT)
| (phyreg << PHYCR_REG_SHIFT);
writel(tmp, &regs->phycr);
for (ts = get_timer(0); get_timer(ts) < CFG_MDIORD_TIMEOUT; ) {
tmp = readl(&regs->phycr);
if (tmp & PHYCR_READ)
continue;
break;
}
if (tmp & PHYCR_READ)
printf("ftmac110: mdio read timeout\n");
else
ret = (uint16_t)(tmp & 0xffff);
return ret;
}
static void mdio_write(struct eth_device *dev,
uint8_t phyaddr, uint8_t phyreg, uint16_t phydata)
{
struct ftmac110_chip *chip = dev->priv;
struct ftmac110_regs *regs = chip->regs;
uint32_t tmp, ts;
tmp = PHYCR_WRITE
| (phyaddr << PHYCR_ADDR_SHIFT)
| (phyreg << PHYCR_REG_SHIFT);
writel(phydata, &regs->phydr);
writel(tmp, &regs->phycr);
for (ts = get_timer(0); get_timer(ts) < CFG_MDIOWR_TIMEOUT; ) {
if (readl(&regs->phycr) & PHYCR_WRITE)
continue;
break;
}
if (readl(&regs->phycr) & PHYCR_WRITE)
printf("ftmac110: mdio write timeout\n");
}
static uint32_t ftmac110_phyqry(struct eth_device *dev)
{
ulong ts;
uint32_t maccr;
uint16_t pa, tmp, bmsr, bmcr;
struct ftmac110_chip *chip = dev->priv;
/* Default = 100Mbps Full */
maccr = MACCR_100M | MACCR_FD;
/* 1. find the phy device */
for (pa = 0; pa < 32; ++pa) {
tmp = mdio_read(dev, pa, MII_PHYSID1);
if (tmp == 0xFFFF || tmp == 0x0000)
continue;
chip->phy_addr = pa;
break;
}
if (pa >= 32) {
puts("ftmac110: phy device not found!\n");
goto exit;
}
/* 2. wait until link-up & auto-negotiation complete */
chip->lnkup = 0;
bmcr = mdio_read(dev, chip->phy_addr, MII_BMCR);
ts = get_timer(0);
do {
bmsr = mdio_read(dev, chip->phy_addr, MII_BMSR);
chip->lnkup = (bmsr & BMSR_LSTATUS) ? 1 : 0;
if (!chip->lnkup)
continue;
if (!(bmcr & BMCR_ANENABLE) || (bmsr & BMSR_ANEGCOMPLETE))
break;
} while (get_timer(ts) < CFG_LINKUP_TIMEOUT);
if (!chip->lnkup) {
puts("ftmac110: link down\n");
goto exit;
}
if (!(bmcr & BMCR_ANENABLE))
puts("ftmac110: auto negotiation disabled\n");
else if (!(bmsr & BMSR_ANEGCOMPLETE))
puts("ftmac110: auto negotiation timeout\n");
/* 3. derive MACCR */
if ((bmcr & BMCR_ANENABLE) && (bmsr & BMSR_ANEGCOMPLETE)) {
tmp = mdio_read(dev, chip->phy_addr, MII_ADVERTISE);
tmp &= mdio_read(dev, chip->phy_addr, MII_LPA);
if (tmp & LPA_100FULL) /* 100Mbps full-duplex */
maccr = MACCR_100M | MACCR_FD;
else if (tmp & LPA_100HALF) /* 100Mbps half-duplex */
maccr = MACCR_100M;
else if (tmp & LPA_10FULL) /* 10Mbps full-duplex */
maccr = MACCR_FD;
else if (tmp & LPA_10HALF) /* 10Mbps half-duplex */
maccr = 0;
} else {
if (bmcr & BMCR_SPEED100)
maccr = MACCR_100M;
else
maccr = 0;
if (bmcr & BMCR_FULLDPLX)
maccr |= MACCR_FD;
}
exit:
printf("ftmac110: %d Mbps, %s\n",
(maccr & MACCR_100M) ? 100 : 10,
(maccr & MACCR_FD) ? "Full" : "half");
return maccr;
}
static int ftmac110_reset(struct eth_device *dev)
{
uint8_t *a;
uint32_t i, maccr;
struct ftmac110_chip *chip = dev->priv;
struct ftmac110_regs *regs = chip->regs;
/* 1. MAC reset */
writel(MACCR_RESET, &regs->maccr);
for (i = get_timer(0); get_timer(i) < 1000; ) {
if (readl(&regs->maccr) & MACCR_RESET)
continue;
break;
}
if (readl(&regs->maccr) & MACCR_RESET) {
printf("ftmac110: reset failed\n");
return -ENXIO;
}
/* 1-1. Init tx ring */
for (i = 0; i < CFG_TXDES_NUM; ++i) {
/* owned by SW */
chip->txd[i].ctrl &= cpu_to_le64(FTMAC110_TXD_CLRMASK);
}
chip->txd_idx = 0;
/* 1-2. Init rx ring */
for (i = 0; i < CFG_RXDES_NUM; ++i) {
/* owned by HW */
chip->rxd[i].ctrl &= cpu_to_le64(FTMAC110_RXD_CLRMASK);
chip->rxd[i].ctrl |= cpu_to_le64(FTMAC110_RXD_OWNER);
}
chip->rxd_idx = 0;
/* 2. PHY status query */
maccr = ftmac110_phyqry(dev);
/* 3. Fix up the MACCR value */
chip->maccr = maccr | MACCR_CRCAPD | MACCR_RXALL | MACCR_RXRUNT
| MACCR_RXEN | MACCR_TXEN | MACCR_RXDMAEN | MACCR_TXDMAEN;
/* 4. MAC address setup */
a = dev->enetaddr;
writel(a[1] | (a[0] << 8), &regs->mac[0]);
writel(a[5] | (a[4] << 8) | (a[3] << 16)
| (a[2] << 24), &regs->mac[1]);
/* 5. MAC registers setup */
writel(chip->rxd_dma, &regs->rxba);
writel(chip->txd_dma, &regs->txba);
/* interrupt at each tx/rx */
writel(ITC_DEFAULT, &regs->itc);
/* no tx pool, rx poll = 1 normal cycle */
writel(APTC_DEFAULT, &regs->aptc);
/* rx threshold = [6/8 fifo, 2/8 fifo] */
writel(DBLAC_DEFAULT, &regs->dblac);
/* disable & clear all interrupt status */
chip->imr = 0;
writel(ISR_ALL, &regs->isr);
writel(chip->imr, &regs->imr);
/* enable mac */
writel(chip->maccr, &regs->maccr);
return 0;
}
static int ftmac110_probe(struct eth_device *dev, bd_t *bis)
{
debug("ftmac110: probe\n");
if (ftmac110_reset(dev))
return -1;
return 0;
}
static void ftmac110_halt(struct eth_device *dev)
{
struct ftmac110_chip *chip = dev->priv;
struct ftmac110_regs *regs = chip->regs;
writel(0, &regs->imr);
writel(0, &regs->maccr);
debug("ftmac110: halt\n");
}
static int ftmac110_send(struct eth_device *dev, void *pkt, int len)
{
struct ftmac110_chip *chip = dev->priv;
struct ftmac110_regs *regs = chip->regs;
struct ftmac110_desc *txd;
uint64_t ctrl;
if (!chip->lnkup)
return 0;
if (len <= 0 || len > CFG_XBUF_SIZE) {
printf("ftmac110: bad tx pkt len(%d)\n", len);
return 0;
}
len = max(60, len);
txd = &chip->txd[chip->txd_idx];
ctrl = le64_to_cpu(txd->ctrl);
if (ctrl & FTMAC110_TXD_OWNER) {
/* kick-off Tx DMA */
writel(0xffffffff, &regs->txpd);
printf("ftmac110: out of txd\n");
return 0;
}
memcpy(txd->vbuf, (void *)pkt, len);
dma_map_single(txd->vbuf, len, DMA_TO_DEVICE);
/* clear control bits */
ctrl &= FTMAC110_TXD_CLRMASK;
/* set len, fts and lts */
ctrl |= FTMAC110_TXD_LEN(len) | FTMAC110_TXD_FTS | FTMAC110_TXD_LTS;
/* set owner bit */
ctrl |= FTMAC110_TXD_OWNER;
/* write back to descriptor */
txd->ctrl = cpu_to_le64(ctrl);
/* kick-off Tx DMA */
writel(0xffffffff, &regs->txpd);
chip->txd_idx = (chip->txd_idx + 1) % CFG_TXDES_NUM;
return len;
}
static int ftmac110_recv(struct eth_device *dev)
{
struct ftmac110_chip *chip = dev->priv;
struct ftmac110_desc *rxd;
uint32_t len, rlen = 0;
uint64_t ctrl;
uint8_t *buf;
if (!chip->lnkup)
return 0;
do {
rxd = &chip->rxd[chip->rxd_idx];
ctrl = le64_to_cpu(rxd->ctrl);
if (ctrl & FTMAC110_RXD_OWNER)
break;
len = (uint32_t)FTMAC110_RXD_LEN(ctrl);
buf = rxd->vbuf;
if (ctrl & FTMAC110_RXD_ERRMASK) {
printf("ftmac110: rx error\n");
} else {
dma_map_single(buf, len, DMA_FROM_DEVICE);
net_process_received_packet(buf, len);
rlen += len;
}
/* owned by hardware */
ctrl &= FTMAC110_RXD_CLRMASK;
ctrl |= FTMAC110_RXD_OWNER;
rxd->ctrl |= cpu_to_le64(ctrl);
chip->rxd_idx = (chip->rxd_idx + 1) % CFG_RXDES_NUM;
} while (0);
return rlen;
}
#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
static int ftmac110_mdio_read(struct mii_dev *bus, int addr, int devad,
int reg)
{
uint16_t value = 0;
int ret = 0;
struct eth_device *dev;
dev = eth_get_dev_by_name(bus->name);
if (dev == NULL) {
printf("%s: no such device\n", bus->name);
ret = -1;
} else {
value = mdio_read(dev, addr, reg);
}
if (ret < 0)
return ret;
return value;
}
static int ftmac110_mdio_write(struct mii_dev *bus, int addr, int devad,
int reg, u16 value)
{
int ret = 0;
struct eth_device *dev;
dev = eth_get_dev_by_name(bus->name);
if (dev == NULL) {
printf("%s: no such device\n", bus->name);
ret = -1;
} else {
mdio_write(dev, addr, reg, value);
}
return ret;
}
#endif /* #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) */
int ftmac110_initialize(bd_t *bis)
{
int i, card_nr = 0;
struct eth_device *dev;
struct ftmac110_chip *chip;
dev = malloc(sizeof(*dev) + sizeof(*chip));
if (dev == NULL) {
panic("ftmac110: out of memory 1\n");
return -1;
}
chip = (struct ftmac110_chip *)(dev + 1);
memset(dev, 0, sizeof(*dev) + sizeof(*chip));
sprintf(dev->name, "FTMAC110#%d", card_nr);
dev->iobase = CONFIG_FTMAC110_BASE;
chip->regs = (void __iomem *)dev->iobase;
dev->priv = chip;
dev->init = ftmac110_probe;
dev->halt = ftmac110_halt;
dev->send = ftmac110_send;
dev->recv = ftmac110_recv;
/* allocate tx descriptors (it must be 16 bytes aligned) */
chip->txd = dma_alloc_coherent(
sizeof(struct ftmac110_desc) * CFG_TXDES_NUM, &chip->txd_dma);
if (!chip->txd)
panic("ftmac110: out of memory 3\n");
memset(chip->txd, 0,
sizeof(struct ftmac110_desc) * CFG_TXDES_NUM);
for (i = 0; i < CFG_TXDES_NUM; ++i) {
void *va = memalign(ARCH_DMA_MINALIGN, CFG_XBUF_SIZE);
if (!va)
panic("ftmac110: out of memory 4\n");
chip->txd[i].vbuf = va;
chip->txd[i].pbuf = cpu_to_le32(virt_to_phys(va));
chip->txd[i].ctrl = 0; /* owned by SW */
}
chip->txd[i - 1].ctrl |= cpu_to_le64(FTMAC110_TXD_END);
chip->txd_idx = 0;
/* allocate rx descriptors (it must be 16 bytes aligned) */
chip->rxd = dma_alloc_coherent(
sizeof(struct ftmac110_desc) * CFG_RXDES_NUM, &chip->rxd_dma);
if (!chip->rxd)
panic("ftmac110: out of memory 4\n");
memset((void *)chip->rxd, 0,
sizeof(struct ftmac110_desc) * CFG_RXDES_NUM);
for (i = 0; i < CFG_RXDES_NUM; ++i) {
void *va = memalign(ARCH_DMA_MINALIGN, CFG_XBUF_SIZE + 2);
if (!va)
panic("ftmac110: out of memory 5\n");
/* it needs to be exactly 2 bytes aligned */
va = ((uint8_t *)va + 2);
chip->rxd[i].vbuf = va;
chip->rxd[i].pbuf = cpu_to_le32(virt_to_phys(va));
chip->rxd[i].ctrl = cpu_to_le64(FTMAC110_RXD_OWNER
| FTMAC110_RXD_BUFSZ(CFG_XBUF_SIZE));
}
chip->rxd[i - 1].ctrl |= cpu_to_le64(FTMAC110_RXD_END);
chip->rxd_idx = 0;
eth_register(dev);
#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
int retval;
struct mii_dev *mdiodev = mdio_alloc();
if (!mdiodev)
return -ENOMEM;
strncpy(mdiodev->name, dev->name, MDIO_NAME_LEN);
mdiodev->read = ftmac110_mdio_read;
mdiodev->write = ftmac110_mdio_write;
retval = mdio_register(mdiodev);
if (retval < 0)
return retval;
#endif
card_nr++;
return card_nr;
}
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