diff options
Diffstat (limited to 'drivers/net/at91_emac.c')
| -rw-r--r-- | drivers/net/at91_emac.c | 498 |
1 files changed, 498 insertions, 0 deletions
diff --git a/drivers/net/at91_emac.c b/drivers/net/at91_emac.c new file mode 100644 index 000000000..239956998 --- /dev/null +++ b/drivers/net/at91_emac.c @@ -0,0 +1,498 @@ +/* + * Copyright (C) 2009 BuS Elektronik GmbH & Co. KG + * Jens Scharsig (esw@bus-elektronik.de) + * + * (C) Copyright 2003 + * Author : Hamid Ikdoumi (Atmel) + + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <asm/io.h> +#ifndef CONFIG_AT91_LEGACY +#include <asm/arch/hardware.h> +#include <asm/arch/at91_emac.h> +#include <asm/arch/at91_pmc.h> +#include <asm/arch/at91_pio.h> +#else +/* remove next 5 lines, if all RM9200 boards convert to at91 arch */ +#include <asm/arch-at91/at91rm9200.h> +#include <asm/arch-at91/hardware.h> +#include <asm/arch-at91/at91_emac.h> +#include <asm/arch-at91/at91_pmc.h> +#include <asm/arch-at91/at91_pio.h> +#endif +#include <net.h> +#include <netdev.h> +#include <malloc.h> +#include <miiphy.h> +#include <linux/mii.h> + +#undef MII_DEBUG +#undef ET_DEBUG + +#if (CONFIG_SYS_RX_ETH_BUFFER > 1024) +#error AT91 EMAC supports max 1024 RX buffers. \ + Please decrease the CONFIG_SYS_RX_ETH_BUFFER value +#endif + +/* MDIO clock must not exceed 2.5 MHz, so enable MCK divider */ +#if (AT91C_MASTER_CLOCK > 80000000) + #define HCLK_DIV AT91_EMAC_CFG_MCLK_64 +#elif (AT91C_MASTER_CLOCK > 40000000) + #define HCLK_DIV AT91_EMAC_CFG_MCLK_32 +#elif (AT91C_MASTER_CLOCK > 20000000) + #define HCLK_DIV AT91_EMAC_CFG_MCLK_16 +#else + #define HCLK_DIV AT91_EMAC_CFG_MCLK_8 +#endif + +#ifdef ET_DEBUG +#define DEBUG_AT91EMAC(...) printf(__VA_ARGS__); +#else +#define DEBUG_AT91EMAC(...) +#endif + +#ifdef MII_DEBUG +#define DEBUG_AT91PHY(...) printf(__VA_ARGS__); +#else +#define DEBUG_AT91PHY(...) +#endif + +#ifndef CONFIG_DRIVER_AT91EMAC_QUIET +#define VERBOSEP(...) printf(__VA_ARGS__); +#else +#define VERBOSEP(...) +#endif + +#define RBF_ADDR 0xfffffffc +#define RBF_OWNER (1<<0) +#define RBF_WRAP (1<<1) +#define RBF_BROADCAST (1<<31) +#define RBF_MULTICAST (1<<30) +#define RBF_UNICAST (1<<29) +#define RBF_EXTERNAL (1<<28) +#define RBF_UNKOWN (1<<27) +#define RBF_SIZE 0x07ff +#define RBF_LOCAL4 (1<<26) +#define RBF_LOCAL3 (1<<25) +#define RBF_LOCAL2 (1<<24) +#define RBF_LOCAL1 (1<<23) + +#define RBF_FRAMEMAX CONFIG_SYS_RX_ETH_BUFFER +#define RBF_FRAMELEN 0x600 + +typedef struct { + unsigned long addr, size; +} rbf_t; + +typedef struct { + rbf_t rbfdt[RBF_FRAMEMAX]; + unsigned long rbindex; +} emac_device; + +void at91emac_EnableMDIO(at91_emac_t *at91mac) +{ + /* Mac CTRL reg set for MDIO enable */ + writel(readl(&at91mac->ctl) | AT91_EMAC_CTL_MPE, &at91mac->ctl); +} + +void at91emac_DisableMDIO(at91_emac_t *at91mac) +{ + /* Mac CTRL reg set for MDIO disable */ + writel(readl(&at91mac->ctl) & ~AT91_EMAC_CTL_MPE, &at91mac->ctl); +} + +int at91emac_read(at91_emac_t *at91mac, unsigned char addr, + unsigned char reg, unsigned short *value) +{ + at91emac_EnableMDIO(at91mac); + + writel(AT91_EMAC_MAN_HIGH | AT91_EMAC_MAN_RW_R | + AT91_EMAC_MAN_REGA(reg) | AT91_EMAC_MAN_CODE_802_3 | + AT91_EMAC_MAN_PHYA(addr), + &at91mac->man); + udelay(10000); + *value = readl(&at91mac->man) & AT91_EMAC_MAN_DATA_MASK; + + at91emac_DisableMDIO(at91mac); + + DEBUG_AT91PHY("AT91PHY read %x REG(%d)=%x\n", at91mac, reg, *value) + + return 0; +} + +int at91emac_write(at91_emac_t *at91mac, unsigned char addr, + unsigned char reg, unsigned short value) +{ + DEBUG_AT91PHY("AT91PHY write %x REG(%d)=%x\n", at91mac, reg, &value) + + at91emac_EnableMDIO(at91mac); + + writel(AT91_EMAC_MAN_HIGH | AT91_EMAC_MAN_RW_W | + AT91_EMAC_MAN_REGA(reg) | AT91_EMAC_MAN_CODE_802_3 | + AT91_EMAC_MAN_PHYA(addr) | (value & AT91_EMAC_MAN_DATA_MASK), + &at91mac->man); + udelay(10000); + + at91emac_DisableMDIO(at91mac); + return 0; +} + +#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) + +at91_emac_t *get_emacbase_by_name(char *devname) +{ + struct eth_device *netdev; + + netdev = eth_get_dev_by_name(devname); + return (at91_emac_t *) netdev->iobase; +} + +int at91emac_mii_read(char *devname, unsigned char addr, + unsigned char reg, unsigned short *value) +{ + at91_emac_t *emac; + + emac = get_emacbase_by_name(devname); + at91emac_read(emac , addr, reg, value); + return 0; +} + + +int at91emac_mii_write(char *devname, unsigned char addr, + unsigned char reg, unsigned short value) +{ + at91_emac_t *emac; + + emac = get_emacbase_by_name(devname); + at91emac_write(emac, addr, reg, value); + return 0; +} + +#endif + +static int at91emac_phy_reset(struct eth_device *netdev) +{ + int i; + u16 status, adv; + at91_emac_t *emac; + + emac = (at91_emac_t *) netdev->iobase; + + adv = ADVERTISE_CSMA | ADVERTISE_ALL; + at91emac_write(emac, 0, MII_ADVERTISE, adv); + VERBOSEP("%s: Starting autonegotiation...\n", netdev->name); + at91emac_write(emac, 0, MII_BMCR, (BMCR_ANENABLE | BMCR_ANRESTART)); + + for (i = 0; i < 100000 / 100; i++) { + at91emac_read(emac, 0, MII_BMSR, &status); + if (status & BMSR_ANEGCOMPLETE) + break; + udelay(100); + } + + if (status & BMSR_ANEGCOMPLETE) { + VERBOSEP("%s: Autonegotiation complete\n", netdev->name); + } else { + printf("%s: Autonegotiation timed out (status=0x%04x)\n", + netdev->name, status); + return 1; + } + return 0; +} + +static int at91emac_phy_init(struct eth_device *netdev) +{ + u16 phy_id, status, adv, lpa; + int media, speed, duplex; + int i; + at91_emac_t *emac; + + emac = (at91_emac_t *) netdev->iobase; + + /* Check if the PHY is up to snuff... */ + at91emac_read(emac, 0, MII_PHYSID1, &phy_id); + if (phy_id == 0xffff) { + printf("%s: No PHY present\n", netdev->name); + return 1; + } + + at91emac_read(emac, 0, MII_BMSR, &status); + + if (!(status & BMSR_LSTATUS)) { + /* Try to re-negotiate if we don't have link already. */ + if (at91emac_phy_reset(netdev)) + return 2; + + for (i = 0; i < 100000 / 100; i++) { + at91emac_read(emac, 0, MII_BMSR, &status); + if (status & BMSR_LSTATUS) + break; + udelay(100); + } + } + if (!(status & BMSR_LSTATUS)) { + VERBOSEP("%s: link down\n", netdev->name); + return 3; + } else { + at91emac_read(emac, 0, MII_ADVERTISE, &adv); + at91emac_read(emac, 0, MII_LPA, &lpa); + media = mii_nway_result(lpa & adv); + speed = (media & (ADVERTISE_100FULL | ADVERTISE_100HALF) + ? 1 : 0); + duplex = (media & ADVERTISE_FULL) ? 1 : 0; + VERBOSEP("%s: link up, %sMbps %s-duplex\n", + netdev->name, + speed ? "100" : "10", + duplex ? "full" : "half"); + } + return 0; +} + +int at91emac_UpdateLinkSpeed(at91_emac_t *emac) +{ + unsigned short stat1; + + at91emac_read(emac, 0, MII_BMSR, &stat1); + + if (!(stat1 & BMSR_LSTATUS)) /* link status up? */ + return 1; + + if (stat1 & BMSR_100FULL) { + /*set Emac for 100BaseTX and Full Duplex */ + writel(readl(&emac->cfg) | + AT91_EMAC_CFG_SPD | AT91_EMAC_CFG_FD, + &emac->cfg); + return 0; + } + + if (stat1 & BMSR_10FULL) { + /*set MII for 10BaseT and Full Duplex */ + writel((readl(&emac->cfg) & + ~(AT91_EMAC_CFG_SPD | AT91_EMAC_CFG_FD) + ) | AT91_EMAC_CFG_FD, + &emac->cfg); + return 0; + } + + if (stat1 & BMSR_100HALF) { + /*set MII for 100BaseTX and Half Duplex */ + writel((readl(&emac->cfg) & + ~(AT91_EMAC_CFG_SPD | AT91_EMAC_CFG_FD) + ) | AT91_EMAC_CFG_SPD, + &emac->cfg); + return 0; + } + + if (stat1 & BMSR_10HALF) { + /*set MII for 10BaseT and Half Duplex */ + writel((readl(&emac->cfg) & + ~(AT91_EMAC_CFG_SPD | AT91_EMAC_CFG_FD)), + &emac->cfg); + return 0; + } + return 1; +} + +static int at91emac_init(struct eth_device *netdev, bd_t *bd) +{ + int i; + u32 value; + emac_device *dev; + at91_emac_t *emac; + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + at91_pmc_t *pmc = (at91_pmc_t *) AT91_PMC_BASE; + + emac = (at91_emac_t *) netdev->iobase; + dev = (emac_device *) netdev->priv; + + /* PIO Disable Register */ + value = AT91_PMX_AA_EMDIO | AT91_PMX_AA_EMDC | + AT91_PMX_AA_ERXER | AT91_PMX_AA_ERX1 | + AT91_PMX_AA_ERX0 | AT91_PMX_AA_ECRS | + AT91_PMX_AA_ETX1 | AT91_PMX_AA_ETX0 | + AT91_PMX_AA_ETXEN | AT91_PMX_AA_EREFCK; + + writel(value, &pio->pioa.pdr); + writel(value, &pio->pioa.asr); + +#ifdef CONFIG_RMII + value = AT91_PMX_BA_ERXCK; +#else + value = AT91_PMX_BA_ERXCK | AT91_PMX_BA_ECOL | + AT91_PMX_BA_ERXDV | AT91_PMX_BA_ERX3 | + AT91_PMX_BA_ERX2 | AT91_PMX_BA_ETXER | + AT91_PMX_BA_ETX3 | AT91_PMX_BA_ETX2; +#endif + writel(value, &pio->piob.pdr); + writel(value, &pio->piob.bsr); + + writel(1 << AT91_ID_EMAC, &pmc->pcer); + writel(readl(&emac->ctl) | AT91_EMAC_CTL_CSR, &emac->ctl); + + DEBUG_AT91EMAC("init MAC-ADDR %x%x \n", + cpu_to_le16(*((u16 *)(netdev->enetaddr + 4))), + cpu_to_le32(*((u32 *)netdev->enetaddr))); + writel(cpu_to_le32(*((u32 *)netdev->enetaddr)), &emac->sa2l); + writel(cpu_to_le16(*((u16 *)(netdev->enetaddr + 4))), &emac->sa2h); + DEBUG_AT91EMAC("init MAC-ADDR %x%x \n", + readl(&emac->sa2h), readl(&emac->sa2l)); + + /* Init Ethernet buffers */ + for (i = 0; i < RBF_FRAMEMAX; i++) { + dev->rbfdt[i].addr = (unsigned long) NetRxPackets[i]; + dev->rbfdt[i].size = 0; + } + dev->rbfdt[RBF_FRAMEMAX - 1].addr |= RBF_WRAP; + dev->rbindex = 0; + writel((u32) &(dev->rbfdt[0]), &emac->rbqp); + + writel(readl(&emac->rsr) & + ~(AT91_EMAC_RSR_OVR | AT91_EMAC_RSR_REC | AT91_EMAC_RSR_BNA), + &emac->rsr); + + value = AT91_EMAC_CFG_CAF | AT91_EMAC_CFG_NBC | + HCLK_DIV; +#ifdef CONFIG_RMII + value |= AT91C_EMAC_RMII; +#endif + writel(value, &emac->cfg); + + writel(readl(&emac->ctl) | AT91_EMAC_CTL_TE | AT91_EMAC_CTL_RE, + &emac->ctl); + + if (!at91emac_phy_init(netdev)) { + at91emac_UpdateLinkSpeed(emac); + return 0; + } + return 1; +} + +static void at91emac_halt(struct eth_device *netdev) +{ + at91_emac_t *emac; + + emac = (at91_emac_t *) netdev->iobase; + writel(readl(&emac->ctl) & ~(AT91_EMAC_CTL_TE | AT91_EMAC_CTL_RE), + &emac->ctl); + DEBUG_AT91EMAC("halt MAC\n"); +} + +static int at91emac_send(struct eth_device *netdev, volatile void *packet, + int length) +{ + at91_emac_t *emac; + + emac = (at91_emac_t *) netdev->iobase; + + while (!(readl(&emac->tsr) & AT91_EMAC_TSR_BNQ)) + ; + writel((u32) packet, &emac->tar); + writel(AT91_EMAC_TCR_LEN(length), &emac->tcr); + while (AT91_EMAC_TCR_LEN(readl(&emac->tcr))) + ; + DEBUG_AT91EMAC("Send %d \n", length); + writel(readl(&emac->tsr) | AT91_EMAC_TSR_COMP, &emac->tsr); + return 0; +} + +static int at91emac_recv(struct eth_device *netdev) +{ + emac_device *dev; + at91_emac_t *emac; + rbf_t *rbfp; + int size; + + emac = (at91_emac_t *) netdev->iobase; + dev = (emac_device *) netdev->priv; + + rbfp = &dev->rbfdt[dev->rbindex]; + while (rbfp->addr & RBF_OWNER) { + size = rbfp->size & RBF_SIZE; + NetReceive(NetRxPackets[dev->rbindex], size); + + DEBUG_AT91EMAC("Recv[%d]: %d bytes @ %x \n", + dev->rbindex, size, rbfp->addr); + + rbfp->addr &= ~RBF_OWNER; + rbfp->size = 0; + if (dev->rbindex < (RBF_FRAMEMAX-1)) + dev->rbindex++; + else + dev->rbindex = 0; + + rbfp = &(dev->rbfdt[dev->rbindex]); + if (!(rbfp->addr & RBF_OWNER)) + writel(readl(&emac->rsr) | AT91_EMAC_RSR_REC, + &emac->rsr); + } + + if (readl(&emac->isr) & AT91_EMAC_IxR_RBNA) { + /* EMAC silicon bug 41.3.1 workaround 1 */ + writel(readl(&emac->ctl) & ~AT91_EMAC_CTL_RE, &emac->ctl); + writel(readl(&emac->ctl) | AT91_EMAC_CTL_RE, &emac->ctl); + dev->rbindex = 0; + printf("%s: reset receiver (EMAC dead lock bug)\n", + netdev->name); + } + return 0; +} + +int at91emac_register(bd_t *bis, unsigned long iobase) +{ + emac_device *emac; + emac_device *emacfix; + struct eth_device *dev; + + if (iobase == 0) + iobase = AT91_EMAC_BASE; + emac = malloc(sizeof(*emac)+512); + if (emac == NULL) + return 1; + dev = malloc(sizeof(*dev)); + if (dev == NULL) { + free(emac); + return 1; + } + /* alignment as per Errata (64 bytes) is insufficient! */ + emacfix = (emac_device *) (((unsigned long) emac + 0x1ff) & 0xFFFFFE00); + memset(emacfix, 0, sizeof(emac_device)); + + memset(dev, 0, sizeof(*dev)); +#ifndef CONFIG_RMII + sprintf(dev->name, "AT91 EMAC"); +#else + sprintf(dev->name, "AT91 EMAC RMII"); +#endif + dev->iobase = iobase; + dev->priv = emacfix; + dev->init = at91emac_init; + dev->halt = at91emac_halt; + dev->send = at91emac_send; + dev->recv = at91emac_recv; + + eth_register(dev); + +#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) + miiphy_register(dev->name, at91emac_mii_read, at91emac_mii_write); +#endif + return 1; +} |