[U-Boot] [PATCH 7/8 V2] add at91 SoC access with c structures

Jens Scharsig
2010-01-16T20:29:47Z

* add new at91_emac driver
* using c structure SoC access
* supports NET_MULTI for AT91RM9200

Signed-off-by: Jens Scharsig <js_at_ng@scharsoft.de>
---
drivers/net/at91_emac.c | 498 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 498 insertions(+), 0 deletions(-)
create mode 100644 drivers/net/at91_emac.c

diff --git a/drivers/net/at91_emac.c b/drivers/net/at91_emac.c
new file mode 100644
index 0000000..9822b1b
--- /dev/null
+++ b/drivers/net/at91_emac.c
@@ -0,0 +1,498 @@
+/*
+ * Copyright (C) 2009 BuS Elektronik GmbH & Co. KG
+ * Jens Scharsig (esw at 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;
+}
--
1.6.0.2