[U-Boot] [PATCH] AT92RM9200 EMAC driver for NET MULTI API
Jens Scharsig
esw at bus-elektronik.de
Thu Oct 8 14:42:24 CEST 2009
This patch adds a new net api driver for AT91RM9200 EMAC
* adds NET_MULTI api EMAC (CONFIG_DRIVER_AT91EMAC)
* generic PHY initialization
Signed-off-by: Jens Scharsig <esw at bus-elektronik.de>
---
This patch was tested with full MII interface and LXT971 Phy on our
upcomming new board.
I have also tested the RMII interface with DM9161 Phy on a CARMEVA-board.
I have no u-boot supported AT91RM9200 boards.
My appeal to all AT91RM9200 boards maintainers: Please test
Changes to make your board use NET_MULTI api:
* include/configs/<board>.h
1. change CONFIG_DRIVER_ETHER to CONFIG_DRIVER_AT91EMAC
2. define CONFIG_NET_MULTI
3. set CONFIG_SYS_RX_ETH_BUFFER, if you want more than standard rx buffers
4. define CONFIG_AT91C_USE_RMII, if you board use RMII interface
* add following code to board file
#ifdef CONFIG_DRIVER_AT91EMAC
int board_eth_init(bd_t *bis)
{
int rc = 0;
rc = at91emac_register(bis, AT91C_BASE_EMAC);
return rc;
}
#endif
diff --git a/README b/README
index dee0e67..00d33be 100644
--- a/README
+++ b/README
@@ -817,6 +817,16 @@ The following options need to be configured:
- NETWORK Support (other):
+ CONFIG_DRIVER_AT91EMAC
+ Support for AT91RM9200 EMAC.
+
+ CONFIG_RMII
+ Define this to use reduced MII inteface
+
+ CONFIG_DRIVER_AT91EMAC_QUIET
+ If this defined, the driver is quiet.
+ The driver doen't show link status messages.
+
CONFIG_DRIVER_LAN91C96
Support for SMSC's LAN91C96 chips.
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index fc9887b..3899052 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -27,6 +27,7 @@ LIB := $(obj)libnet.a
COBJS-$(CONFIG_DRIVER_3C589) += 3c589.o
COBJS-$(CONFIG_PPC4xx_EMAC) += 4xx_enet.o
+COBJS-$(CONFIG_DRIVER_AT91EMAC) += at91_emac.o
COBJS-$(CONFIG_DRIVER_AX88180) += ax88180.o
COBJS-$(CONFIG_BCM570x) += bcm570x.o bcm570x_autoneg.o 5701rls.o
COBJS-$(CONFIG_BFIN_MAC) += bfin_mac.o
diff --git a/drivers/net/at91_emac.c b/drivers/net/at91_emac.c
new file mode 100644
index 0000000..269559c
--- /dev/null
+++ b/drivers/net/at91_emac.c
@@ -0,0 +1,466 @@
+/*
+ * 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/arch/hardware.h>
+#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 AT91C_EMAC_CLK_HCLK_64
+#elif (AT91C_MASTER_CLOCK > 40000000)
+ #define HCLK_DIV AT91C_EMAC_CLK_HCLK_32
+#elif (AT91C_MASTER_CLOCK > 20000000)
+ #define HCLK_DIV AT91C_EMAC_CLK_HCLK_16
+#else
+ #define HCLK_DIV AT91C_EMAC_CLK_HCLK_8
+#endif
+
+#ifdef ET_DEBUG
+#define DEBUG_AT91EAMC(...) printf(__VA_ARGS__);
+#else
+#define DEBUG_AT91EAMC(...)
+#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(AT91PS_EMAC at91mac)
+{
+ /* Mac CTRL reg set for MDIO enable */
+ at91mac->EMAC_CTL |= AT91C_EMAC_MPE; /* Management port enable */
+}
+
+void at91emac_DisableMDIO(AT91PS_EMAC at91mac)
+{
+ /* Mac CTRL reg set for MDIO disable */
+ at91mac->EMAC_CTL &= ~AT91C_EMAC_MPE; /* Management port disable */
+}
+
+int at91emac_read(AT91PS_EMAC at91mac, unsigned char addr,
+ unsigned char reg, unsigned short *value)
+{
+ at91emac_EnableMDIO(at91mac);
+
+ at91mac->EMAC_MAN = (AT91C_EMAC_HIGH & ~AT91C_EMAC_LOW) |
+ (AT91C_EMAC_RW_R) | (reg << 18) |
+ (AT91C_EMAC_CODE_802_3);
+ udelay(10000);
+ *value = (unsigned short) at91mac->EMAC_MAN;
+
+ at91emac_DisableMDIO(at91mac);
+
+ DEBUG_AT91PHY("AT91PHY read %x REG(%d)=%x\n", at91mac, reg, *value)
+
+ return 0;
+}
+
+int at91emac_write(AT91PS_EMAC 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);
+ at91mac->EMAC_MAN = (AT91C_EMAC_HIGH & ~AT91C_EMAC_LOW) |
+ (AT91C_EMAC_CODE_802_3) | AT91C_EMAC_RW_W |
+ (reg << 18) | value;
+
+ udelay(10000);
+
+ at91emac_DisableMDIO(at91mac);
+ return 0;
+}
+
+#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
+
+int at91emac_mii_read(char *devname, unsigned char addr,
+ unsigned char reg, unsigned short *value)
+{
+ struct eth_device *netdev;
+ netdev = eth_get_dev_by_name(devname);
+ at91emac_read((AT91PS_EMAC) netdev->iobase, addr, reg, value);
+ return 0;
+}
+
+
+int at91emac_mii_write(char *devname, unsigned char addr,
+ unsigned char reg, unsigned short value)
+{
+ struct eth_device *netdev;
+ netdev = eth_get_dev_by_name(devname);
+
+ at91emac_write((AT91PS_EMAC) netdev->iobase, addr, reg, value);
+
+ return 0;
+}
+
+#endif
+
+static int at91emac_phy_reset(struct eth_device *netdev)
+{
+ AT91PS_EMAC at91mac;
+
+ int i;
+ u16 status, adv;
+
+ at91mac = (AT91PS_EMAC) netdev->iobase;
+
+ adv = ADVERTISE_CSMA | ADVERTISE_ALL;
+ at91emac_write(at91mac, 0, MII_ADVERTISE, adv);
+ VERBOSEP("%s: Starting autonegotiation...\n", netdev->name);
+ at91emac_write(at91mac, 0, MII_BMCR, (BMCR_ANENABLE
+ | BMCR_ANRESTART));
+
+ for (i = 0; i < 100000 / 100; i++) {
+ at91emac_read(at91mac, 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;
+ AT91PS_EMAC at91mac;
+
+ at91mac = (AT91PS_EMAC) netdev->iobase;
+
+ /* Check if the PHY is up to snuff... */
+ at91emac_read(at91mac, 0, MII_PHYSID1, &phy_id);
+ if (phy_id == 0xffff) {
+ printf("%s: No PHY present\n", netdev->name);
+ return 1;
+ }
+
+ at91emac_read(at91mac, 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(at91mac, 0, MII_BMSR, &status);
+ if (status & BMSR_LSTATUS)
+ break;
+ udelay(100);
+ }
+ }
+ if (!(status & BMSR_LSTATUS)) {
+ VERBOSEP("%s: link down\n", netdev->name, status);
+ return 3;
+ } else {
+ at91emac_read(at91mac, 0, MII_ADVERTISE, &adv);
+ at91emac_read(at91mac, 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",
+ lpa);
+ }
+ return 0;
+}
+
+int at91emac_UpdateLinkSpeed(AT91PS_EMAC at91mac)
+{
+ unsigned short stat1;
+
+ at91emac_read(at91mac, 0, MII_BMSR, &stat1);
+
+ if (!(stat1 & BMSR_LSTATUS)) /* link status up? */
+ return 1;
+
+ if (stat1 & BMSR_100FULL) {
+ /*set Emac for 100BaseTX and Full Duplex */
+ at91mac->EMAC_CFG |= AT91C_EMAC_SPD | AT91C_EMAC_FD;
+ return 0;
+ }
+
+ if (stat1 & BMSR_10FULL) {
+ /*set MII for 10BaseT and Full Duplex */
+ at91mac->EMAC_CFG = (at91mac->EMAC_CFG &
+ ~(AT91C_EMAC_SPD | AT91C_EMAC_FD))
+ | AT91C_EMAC_FD;
+ return 0;
+ }
+
+ if (stat1 & BMSR_100HALF) {
+ /*set MII for 100BaseTX and Half Duplex */
+ at91mac->EMAC_CFG = (at91mac->EMAC_CFG &
+ ~(AT91C_EMAC_SPD | AT91C_EMAC_FD))
+ | AT91C_EMAC_SPD;
+ return 0;
+ }
+
+ if (stat1 & BMSR_10HALF) {
+ /*set MII for 10BaseT and Half Duplex */
+ at91mac->EMAC_CFG &= ~(AT91C_EMAC_SPD | AT91C_EMAC_FD);
+ return 0;
+ }
+ return 1;
+}
+
+static int at91emac_init(struct eth_device *netdev, bd_t *bd)
+{
+ int i;
+ emac_device *emac;
+ AT91PS_EMAC at91mac;
+ at91mac = (AT91PS_EMAC) netdev->iobase;
+ emac = (emac_device *) netdev->priv;
+
+ /* PIO Disable Register */
+ *AT91C_PIOA_PDR =
+ AT91C_PA16_EMDIO | AT91C_PA15_EMDC | AT91C_PA14_ERXER |
+ AT91C_PA13_ERX1 | AT91C_PA12_ERX0 | AT91C_PA11_ECRS_ECRSDV |
+ AT91C_PA10_ETX1 | AT91C_PA9_ETX0 |
+ AT91C_PA8_ETXEN | AT91C_PA7_ETXCK_EREFCK;
+ *AT91C_PIOA_ASR =
+ AT91C_PA16_EMDIO | AT91C_PA15_EMDC | AT91C_PA14_ERXER |
+ AT91C_PA13_ERX1 | AT91C_PA12_ERX0 | AT91C_PA11_ECRS_ECRSDV |
+ AT91C_PA10_ETX1 | AT91C_PA9_ETX0 |
+ AT91C_PA8_ETXEN | AT91C_PA7_ETXCK_EREFCK;
+#ifdef CONFIG_RMII
+ *AT91C_PIOB_PDR = AT91C_PB19_ERXCK;
+ *AT91C_PIOB_BSR = AT91C_PB19_ERXCK;
+#else
+ *AT91C_PIOB_PDR = AT91C_PB19_ERXCK | AT91C_PB18_ECOL |
+ AT91C_PB17_ERXDV | AT91C_PB16_ERX3 | AT91C_PB15_ERX2 |
+ AT91C_PB14_ETXER | AT91C_PB13_ETX3 | AT91C_PB12_ETX2;
+
+ *AT91C_PIOB_BSR = AT91C_PB19_ERXCK | AT91C_PB18_ECOL |
+ AT91C_PB17_ERXDV | AT91C_PB16_ERX3 | AT91C_PB15_ERX2 |
+ AT91C_PB14_ETXER | AT91C_PB13_ETX3 | AT91C_PB12_ETX2;
+#endif
+
+ *AT91C_PMC_PCER = 1 << AT91C_ID_EMAC; /* Peripheral Clock Enable */
+ at91mac->EMAC_CFG |= AT91C_EMAC_CSR; /* Clear statistics */
+
+ /* Init Ethernet buffers */
+ for (i = 0; i < RBF_FRAMEMAX; i++) {
+ emac->rbfdt[i].addr = (unsigned long) NetRxPackets[i];
+ emac->rbfdt[i].size = 0;
+ }
+ emac->rbfdt[RBF_FRAMEMAX - 1].addr |= RBF_WRAP;
+ emac->rbindex = 0;
+
+ at91mac->EMAC_SA2L = cpu_to_le32(*((u32 *)netdev->enetaddr));
+ at91mac->EMAC_SA2H = cpu_to_le16(*((u16 *)(netdev->enetaddr + 4)));
+ DEBUG_AT91EAMC("init MAC-ADDR %x%x \n",
+ at91mac->EMAC_SA2H, at91mac->EMAC_SA2L);
+
+ at91mac->EMAC_RBQP = (long) (&(emac->rbfdt[0]));
+ at91mac->EMAC_RSR &=
+ ~(AT91C_EMAC_RSR_OVR | AT91C_EMAC_REC | AT91C_EMAC_BNA);
+
+ at91mac->EMAC_CFG =
+ (at91mac->EMAC_CFG | AT91C_EMAC_CAF | AT91C_EMAC_NBC)
+ & ~AT91C_EMAC_CLK;
+
+ at91mac->EMAC_CFG =
+ (at91mac->EMAC_CFG & ~AT91C_EMAC_CLK) |
+ AT91C_EMAC_CAF | AT91C_EMAC_NBC |
+ HCLK_DIV;
+
+#ifdef CONFIG_RMII
+ at91mac->EMAC_CFG |= AT91C_EMAC_RMII;
+#endif
+ at91mac->EMAC_CTL |= AT91C_EMAC_TE | AT91C_EMAC_RE;
+
+ if (!at91emac_phy_init(netdev)) {
+ at91emac_UpdateLinkSpeed(at91mac);
+ return 0;
+ }
+ return 1;
+}
+
+static void at91emac_halt(struct eth_device *netdev)
+{
+ AT91PS_EMAC at91mac;
+
+ at91mac = (AT91PS_EMAC) netdev->iobase;
+ at91mac->EMAC_CTL &= ~(AT91C_EMAC_TE | AT91C_EMAC_RE);
+ DEBUG_AT91EAMC("halt MAC-ADDR \n");
+}
+
+static int at91emac_send(struct eth_device *netdev, volatile void *packet,
+ int length)
+{
+ AT91PS_EMAC at91mac;
+ at91mac = (AT91PS_EMAC) netdev->iobase;
+ while (!(at91mac->EMAC_TSR & AT91C_EMAC_BNQ))
+ ;
+ at91mac->EMAC_TAR = (long) packet;
+ at91mac->EMAC_TCR = length;
+ while (at91mac->EMAC_TCR & 0x7ff)
+ ;
+ DEBUG_AT91EAMC("Send %d \n", length);
+ at91mac->EMAC_TSR |= AT91C_EMAC_COMP;
+ return 0;
+}
+
+static int at91emac_recv(struct eth_device *netdev)
+{
+ emac_device *emac;
+ AT91PS_EMAC at91mac;
+ rbf_t *rbfp;
+ int size;
+
+ at91mac = (AT91PS_EMAC) netdev->iobase;
+ emac = (emac_device *) netdev->priv;
+
+ rbfp = &emac->rbfdt[emac->rbindex];
+ while (rbfp->addr & RBF_OWNER) {
+ size = rbfp->size & RBF_SIZE;
+ NetReceive(NetRxPackets[emac->rbindex], size);
+
+ DEBUG_AT91EAMC("Recv[%d]: %d bytes @ %x \n",
+ emac->rbindex, size, rbfp->addr);
+
+ rbfp->addr &= ~RBF_OWNER;
+ rbfp->size = 0;
+ if (emac->rbindex < (RBF_FRAMEMAX-1))
+ emac->rbindex++;
+ else
+ emac->rbindex = 0;
+
+ rbfp = &(emac->rbfdt[emac->rbindex]);
+ if (!(rbfp->addr & RBF_OWNER))
+ at91mac->EMAC_RSR |= AT91C_EMAC_REC;
+ }
+
+ if (at91mac->EMAC_ISR & AT91C_EMAC_RBNA) {
+ /* EMAC silicon bug 41.3.1 workaround 1 */
+ at91mac->EMAC_CTL &= ~AT91C_EMAC_RE;
+ at91mac->EMAC_CTL |= AT91C_EMAC_RE;
+ emac->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;
+
+ 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;
+}
+
diff --git a/include/netdev.h b/include/netdev.h
index a91368e..f771105 100644
--- a/include/netdev.h
+++ b/include/netdev.h
@@ -41,6 +41,7 @@ int board_eth_init(bd_t *bis);
int cpu_eth_init(bd_t *bis);
/* Driver initialization prototypes */
+int at91emac_register(bd_t *bis, unsigned long iobase);
int au1x00_enet_initialize(bd_t*);
int bfin_EMAC_initialize(bd_t *bis);
int cs8900_initialize(u8 dev_num, int base_addr);
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