net: sh: Renesas SH7763 Ethernet device support

Renesas SH7763 has 2 channel Ethernet device.
This is 10/100/1000 Base support.
But this patch check 10/100 Base only.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

1 files changed, 603 insertions, 0 deletions

diff --git a/drivers/net/sh_eth.c b/drivers/net/sh_eth.c
new file mode 100644
index 0000000..9e3cf98
--- /dev/null
+++ b/drivers/net/sh_eth.c
@@ -0,0 +1,603 @@
+/*
+ * sh_eth.c - Driver for Renesas SH7763's ethernet controler.
+ *
+ * Copyright (C) 2008 Renesas Solutions Corp.
+ * Copyright (c) 2008 Nobuhiro Iwamatsu
+ * Copyright (c) 2007 Carlos Munoz <carlos@kenati.com>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+#include <common.h>
+#include <malloc.h>
+#include <net.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+
+#include "sh_eth.h"
+
+#ifndef CONFIG_SH_ETHER_USE_PORT
+# error "Please define CONFIG_SH_ETHER_USE_PORT"
+#endif
+#ifndef CONFIG_SH_ETHER_PHY_ADDR
+# error "Please define CONFIG_SH_ETHER_PHY_ADDR"
+#endif
+
+extern int eth_init(bd_t *bd);
+extern void eth_halt(void);
+extern int eth_rx(void);
+extern int eth_send(volatile void *packet, int length);
+
+static struct dev_info_s *dev;
+
+/*
+ * Bits are written to the PHY serially using the
+ * PIR register, just like a bit banger.
+ */
+static void sh_eth_mii_write_phy_bits(int port, u32 val, int len)
+{
+	int i;
+	u32 pir;
+
+	/* Bit positions is 1 less than the number of bits */
+	for (i = len - 1; i >= 0; i--) {
+		/* Write direction, bit to write, clock is low */
+		pir = 2 | ((val & 1 << i) ? 1 << 2 : 0);
+		outl(pir, PIR(port));
+		udelay(1);
+		/* Write direction, bit to write, clock is high */
+		pir = 3 | ((val & 1 << i) ? 1 << 2 : 0);
+		outl(pir, PIR(port));
+		udelay(1);
+		/* Write direction, bit to write, clock is low */
+		pir = 2 | ((val & 1 << i) ? 1 << 2 : 0);
+		outl(pir, PIR(port));
+		udelay(1);
+	}
+}
+
+static void sh_eth_mii_bus_release(int port)
+{
+	/* Read direction, clock is low */
+	outl(0, PIR(port));
+	udelay(1);
+	/* Read direction, clock is high */
+	outl(1, PIR(port));
+	udelay(1);
+	/* Read direction, clock is low */
+	outl(0, PIR(port));
+	udelay(1);
+}
+
+static void sh_eth_mii_ind_bus_release(int port)
+{
+	/* Read direction, clock is low */
+	outl(0, PIR(port));
+	udelay(1);
+}
+
+static int sh_eth_mii_read_phy_bits(int port, u32 * val, int len)
+{
+	int i;
+	u32 pir;
+
+	*val = 0;
+	for (i = len - 1; i >= 0; i--) {
+		/* Read direction, clock is high */
+		outl(1, PIR(port));
+		udelay(1);
+		/* Read bit */
+		pir = inl(PIR(port));
+		*val |= (pir & 8) ? 1 << i : 0;
+		/* Read direction, clock is low */
+		outl(0, PIR(port));
+		udelay(1);
+	}
+
+	return 0;
+}
+
+#define PHY_INIT	0xFFFFFFFF
+#define PHY_READ	0x02
+#define PHY_WRITE	0x01
+/*
+ * To read a phy register, mii managements frames are sent to the phy.
+ * The frames look like this:
+ * pre (32 bits):	0xffff ffff
+ * st (2 bits):		01
+ * op (2bits):		10: read 01: write
+ * phyad (5 bits):	xxxxx
+ * regad (5 bits):	xxxxx
+ * ta (Bus release):
+ * data (16 bits):	read data
+ */
+static u32 sh_eth_mii_read_phy_reg(int port, u8 phy_addr, int reg)
+{
+	u32 val;
+
+	/* Sent mii management frame */
+	/* pre */
+	sh_eth_mii_write_phy_bits(port, PHY_INIT, 32);
+	/* st (start of frame) */
+	sh_eth_mii_write_phy_bits(port, 0x1, 2);
+	/* op (code) */
+	sh_eth_mii_write_phy_bits(port, PHY_READ, 2);
+	/* phy address */
+	sh_eth_mii_write_phy_bits(port, phy_addr, 5);
+	/* Register to read */
+	sh_eth_mii_write_phy_bits(port, reg, 5);
+
+	/* Bus release */
+	sh_eth_mii_bus_release(port);
+
+	/* Read register */
+	sh_eth_mii_read_phy_bits(port, &val, 16);
+
+	return val;
+}
+
+/*
+ * To write a phy register, mii managements frames are sent to the phy.
+ * The frames look like this:
+ * pre (32 bits):	0xffff ffff
+ * st (2 bits):		01
+ * op (2bits):		10: read 01: write
+ * phyad (5 bits):	xxxxx
+ * regad (5 bits):	xxxxx
+ * ta (2 bits):		10
+ * data (16 bits):	write data
+ * idle (Independent bus release)
+ */
+static void sh_eth_mii_write_phy_reg(int port, u8 phy_addr, int reg, u16 val)
+{
+	/* Sent mii management frame */
+	/* pre */
+	sh_eth_mii_write_phy_bits(port, PHY_INIT, 32);
+	/* st (start of frame) */
+	sh_eth_mii_write_phy_bits(port, 0x1, 2);
+	/* op (code) */
+	sh_eth_mii_write_phy_bits(port, PHY_WRITE, 2);
+	/* phy address */
+	sh_eth_mii_write_phy_bits(port, phy_addr, 5);
+	/* Register to read */
+	sh_eth_mii_write_phy_bits(port, reg, 5);
+	/* ta */
+	sh_eth_mii_write_phy_bits(port, PHY_READ, 2);
+	/* Write register data */
+	sh_eth_mii_write_phy_bits(port, val, 16);
+
+	/* Independent bus release */
+	sh_eth_mii_ind_bus_release(port);
+}
+
+void eth_halt(void)
+{
+}
+
+int eth_send(volatile void *packet, int len)
+{
+	int port = dev->port;
+	struct port_info_s *port_info = &dev->port_info[port];
+	int timeout;
+	int rc = 0;
+
+	if (!packet || len > 0xffff) {
+		printf("eth_send: Invalid argument\n");
+		return -EINVAL;
+	}
+
+	/* packet must be a 4 byte boundary */
+	if ((int)packet & (4 - 1)) {
+		printf("eth_send: packet not 4 byte alligned\n");
+		return -EFAULT;
+	}
+
+	/* Update tx descriptor */
+	port_info->tx_desc_cur->td2 = ADDR_TO_PHY(packet);
+	port_info->tx_desc_cur->td1 = len << 16;
+	/* Must preserve the end of descriptor list indication */
+	if (port_info->tx_desc_cur->td0 & TD_TDLE)
+		port_info->tx_desc_cur->td0 = TD_TACT | TD_TFP | TD_TDLE;
+	else
+		port_info->tx_desc_cur->td0 = TD_TACT | TD_TFP;
+
+	/* Restart the transmitter if disabled */
+	if (!(inl(EDTRR(port)) & EDTRR_TRNS))
+		outl(EDTRR_TRNS, EDTRR(port));
+
+	/* Wait until packet is transmitted */
+	timeout = 1000;
+	while (port_info->tx_desc_cur->td0 & TD_TACT && timeout--)
+		udelay(100);
+
+	if (timeout < 0) {
+		printf("eth_send: transmit timeout\n");
+		rc = -1;
+		goto err;
+	}
+
+err:
+	port_info->tx_desc_cur++;
+	if (port_info->tx_desc_cur >= port_info->tx_desc_base + NUM_TX_DESC)
+		port_info->tx_desc_cur = port_info->tx_desc_base;
+
+	return rc;
+}
+
+int eth_rx(void)
+{
+	int port = dev->port;
+	struct port_info_s *port_info = &dev->port_info[port];
+	int len = 0;
+	volatile u8 *packet;
+
+	/* Check if the rx descriptor is ready */
+	if (!(port_info->rx_desc_cur->rd0 & RD_RACT)) {
+		/* Check for errors */
+		if (!(port_info->rx_desc_cur->rd0 & RD_RFE)) {
+			len = port_info->rx_desc_cur->rd1 & 0xffff;
+			packet = (volatile u8 *)
+			    ADDR_TO_P2(port_info->rx_desc_cur->rd2);
+			NetReceive(packet, len);
+		}
+
+		/* Make current descriptor available again */
+		if (port_info->rx_desc_cur->rd0 & RD_RDLE)
+			port_info->rx_desc_cur->rd0 = RD_RACT | RD_RDLE;
+		else
+			port_info->rx_desc_cur->rd0 = RD_RACT;
+
+		/* Point to the next descriptor */
+		port_info->rx_desc_cur++;
+		if (port_info->rx_desc_cur >=
+		    port_info->rx_desc_base + NUM_RX_DESC)
+			port_info->rx_desc_cur = port_info->rx_desc_base;
+	}
+
+	/* Restart the receiver if disabled */
+	if (!(inl(EDRRR(port)) & EDRRR_R))
+		outl(EDRRR_R, EDRRR(port));
+
+	return len;
+}
+
+#define EDMR_INIT_CNT 1000
+static int sh_eth_reset(struct dev_info_s *dev)
+{
+	int port = dev->port;
+	int i;
+
+	/* Start e-dmac transmitter and receiver */
+	outl(EDSR_ENALL, EDSR(port));
+
+	/* Perform a software reset and wait for it to complete */
+	outl(EDMR_SRST, EDMR(port));
+	for (i = 0; i < EDMR_INIT_CNT; i++) {
+		if (!(inl(EDMR(port)) & EDMR_SRST))
+			break;
+		udelay(1000);
+	}
+
+	if (i == EDMR_INIT_CNT) {
+		printf("Error: Software reset timeout\n");
+		return -1;
+	}
+	return 0;
+}
+
+static int sh_eth_tx_desc_init(struct dev_info_s *dev)
+{
+	int port = dev->port;
+	struct port_info_s *port_info = &dev->port_info[port];
+	u32 tmp_addr;
+	struct tx_desc_s *cur_tx_desc;
+	int i;
+
+	/* Allocate tx descriptors. They must be TX_DESC_SIZE bytes
+	   aligned */
+	if (!(port_info->tx_desc_malloc = malloc(NUM_TX_DESC *
+						 sizeof(struct tx_desc_s) +
+						 TX_DESC_SIZE - 1))) {
+		printf("Error: malloc failed\n");
+		return -ENOMEM;
+	}
+	tmp_addr = (u32) (((int)port_info->tx_desc_malloc + TX_DESC_SIZE - 1) &
+			  ~(TX_DESC_SIZE - 1));
+	/* Make sure we use a P2 address (non-cacheable) */
+	port_info->tx_desc_base = (struct tx_desc_s *)ADDR_TO_P2(tmp_addr);
+
+	port_info->tx_desc_cur = port_info->tx_desc_base;
+
+	/* Initialize all descriptors */
+	for (cur_tx_desc = port_info->tx_desc_base, i = 0; i < NUM_TX_DESC;
+	     cur_tx_desc++, i++) {
+		cur_tx_desc->td0 = 0x00;
+		cur_tx_desc->td1 = 0x00;
+		cur_tx_desc->td2 = 0x00;
+	}
+
+	/* Mark the end of the descriptors */
+	cur_tx_desc--;
+	cur_tx_desc->td0 |= TD_TDLE;
+
+	/* Point the controller to the tx descriptor list. Must use physical
+	   addresses */
+	outl(ADDR_TO_PHY(port_info->tx_desc_base), TDLAR(port));
+	outl(ADDR_TO_PHY(port_info->tx_desc_base), TDFAR(port));
+	outl(ADDR_TO_PHY(cur_tx_desc), TDFXR(port));
+	outl(0x01, TDFFR(port));/* Last discriptor bit */
+
+	return 0;
+}
+
+static int sh_eth_rx_desc_init(struct dev_info_s *dev)
+{
+	int port = dev->port;
+	struct port_info_s *port_info = &dev->port_info[port];
+	u32 tmp_addr;
+	struct rx_desc_s *cur_rx_desc;
+	u8 *rx_buf;
+	int i;
+
+	/* Allocate rx descriptors. They must be RX_DESC_SIZE bytes
+	   aligned */
+	if (!(port_info->rx_desc_malloc = malloc(NUM_RX_DESC *
+						 sizeof(struct rx_desc_s) +
+						 RX_DESC_SIZE - 1))) {
+		printf("Error: malloc failed\n");
+		return -ENOMEM;
+	}
+	tmp_addr = (u32) (((int)port_info->rx_desc_malloc + RX_DESC_SIZE - 1) &
+			  ~(RX_DESC_SIZE - 1));
+	/* Make sure we use a P2 address (non-cacheable) */
+	port_info->rx_desc_base = (struct rx_desc_s *)ADDR_TO_P2(tmp_addr);
+
+	port_info->rx_desc_cur = port_info->rx_desc_base;
+
+	/* Allocate rx data buffers. They must be 32 bytes aligned  and in
+	   P2 area */
+	if (!(port_info->rx_buf_malloc = malloc(NUM_RX_DESC * MAX_BUF_SIZE +
+						31))) {
+		printf("Error: malloc failed\n");
+		free(port_info->rx_desc_malloc);
+		port_info->rx_desc_malloc = NULL;
+		return -ENOMEM;
+	}
+	tmp_addr = (u32)(((int)port_info->rx_buf_malloc + (32 - 1)) &
+			  ~(32 - 1));
+	port_info->rx_buf_base = (u8 *)ADDR_TO_P2(tmp_addr);
+
+	/* Initialize all descriptors */
+	for (cur_rx_desc = port_info->rx_desc_base,
+	     rx_buf = port_info->rx_buf_base, i = 0;
+	     i < NUM_RX_DESC; cur_rx_desc++, rx_buf += MAX_BUF_SIZE, i++) {
+		cur_rx_desc->rd0 = RD_RACT;
+		cur_rx_desc->rd1 = MAX_BUF_SIZE << 16;
+		cur_rx_desc->rd2 = (u32) ADDR_TO_PHY(rx_buf);
+	}
+
+	/* Mark the end of the descriptors */
+	cur_rx_desc--;
+	cur_rx_desc->rd0 |= RD_RDLE;
+
+	/* Point the controller to the rx descriptor list */
+	outl(ADDR_TO_PHY(port_info->rx_desc_base), RDLAR(port));
+	outl(ADDR_TO_PHY(port_info->rx_desc_base), RDFAR(port));
+	outl(ADDR_TO_PHY(cur_rx_desc), RDFXR(port));
+	outl(RDFFR_RDLF, RDFFR(port));
+
+	return 0;
+}
+
+static void sh_eth_desc_free(struct dev_info_s *dev)
+{
+	int port = dev->port;
+	struct port_info_s *port_info = &dev->port_info[port];
+
+	if (port_info->tx_desc_malloc) {
+		free(port_info->tx_desc_malloc);
+		port_info->tx_desc_malloc = NULL;
+	}
+
+	if (port_info->rx_desc_malloc) {
+		free(port_info->rx_desc_malloc);
+		port_info->rx_desc_malloc = NULL;
+	}
+
+	if (port_info->rx_buf_malloc) {
+		free(port_info->rx_buf_malloc);
+		port_info->rx_buf_malloc = NULL;
+	}
+}
+
+static int sh_eth_desc_init(struct dev_info_s *dev)
+{
+	int rc;
+
+	if ((rc = sh_eth_tx_desc_init(dev)) || (rc = sh_eth_rx_desc_init(dev))) {
+		sh_eth_desc_free(dev);
+		return rc;
+	}
+
+	return 0;
+}
+
+static int sh_eth_phy_config(struct dev_info_s *dev)
+{
+	int port = dev->port;
+	struct port_info_s *port_info = &dev->port_info[port];
+	int timeout;
+	u32 val;
+	/* Reset phy */
+	sh_eth_mii_write_phy_reg(port, port_info->phy_addr, PHY_CTRL, PHY_C_RESET);
+	timeout = 10;
+	while (timeout--) {
+		val = sh_eth_mii_read_phy_reg(port, port_info->phy_addr, PHY_CTRL);
+		if (!(val & PHY_C_RESET))
+			break;
+		udelay(50000);
+	}
+	if (timeout < 0) {
+		printf("%s phy reset timeout\n", __func__);
+		return -1;
+	}
+
+	/* Advertise 100/10 baseT full/half duplex */
+	sh_eth_mii_write_phy_reg(port, port_info->phy_addr, PHY_ANA,
+		(PHY_A_FDX|PHY_A_HDX|PHY_A_10FDX|PHY_A_10HDX|PHY_A_EXT));
+	/* Autonegotiation, normal operation, full duplex, enable tx */
+	sh_eth_mii_write_phy_reg(port, port_info->phy_addr, PHY_CTRL,
+		(PHY_C_ANEGEN|PHY_C_RANEG));
+	/* Wait for autonegotiation to complete */
+	timeout = 100;
+	while (timeout--) {
+		val = sh_eth_mii_read_phy_reg(port, port_info->phy_addr, 1);
+		if (val & PHY_S_ANEGC)
+			break;
+		udelay(50000);
+	}
+	if (timeout < 0) {
+		printf("sh_eth_phy_config() phy auto-negotiation failed\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static int sh_eth_config(struct dev_info_s *dev, bd_t * bd)
+{
+	int port = dev->port;
+	struct port_info_s *port_info = &dev->port_info[port];
+	u32 val;
+	u32 phy_status;
+	int rc;
+
+	/* Configure e-dmac registers */
+	outl((inl(EDMR(port)) & ~EMDR_DESC_R) | EDMR_EL, EDMR(port));
+	outl(0, EESIPR(port));
+	outl(0, TRSCER(port));
+	outl(0, TFTR(port));
+	outl((FIFO_SIZE_T | FIFO_SIZE_R), FDR(port));
+	outl(RMCR_RST, RMCR(port));
+	outl(0, RPADIR(port));
+	outl((FIFO_F_D_RFF | FIFO_F_D_RFD), FCFTR(port));
+
+	/* Configure e-mac registers */
+	outl(0, ECSIPR(port));
+
+	/* Set Mac address */
+	val = bd->bi_enetaddr[0] << 24 | bd->bi_enetaddr[1] << 16 |
+	    bd->bi_enetaddr[2] << 8 | bd->bi_enetaddr[3];
+	outl(val, MAHR(port));
+
+	val = bd->bi_enetaddr[4] << 8 | bd->bi_enetaddr[5];
+	outl(val, MALR(port));
+
+	outl(RFLR_RFL_MIN, RFLR(port));
+	outl(0, PIPR(port));
+	outl(APR_AP, APR(port));
+	outl(MPR_MP, MPR(port));
+	outl(TPAUSER_TPAUSE, TPAUSER(port));
+
+	/* Configure phy */
+	if ((rc = sh_eth_phy_config(dev)))
+		return rc;
+
+	/* Read phy status to finish configuring the e-mac */
+	phy_status = sh_eth_mii_read_phy_reg(dev->port,
+					     dev->port_info[dev->port].phy_addr,
+					     1);
+
+	/* Set the transfer speed */
+	if (phy_status & (PHY_S_100X_F|PHY_S_100X_H)) {
+		printf("100Base/");
+		outl(GECMR_100B, GECMR(port));
+	} else {
+		printf("10Base/");
+		outl(GECMR_10B, GECMR(port));
+	}
+
+	/* Check if full duplex mode is supported by the phy */
+	if (phy_status & (PHY_S_100X_F|PHY_S_10T_F)) {
+		printf("Full\n");
+		outl((ECMR_CHG_DM|ECMR_RE|ECMR_TE|ECMR_DM), ECMR(port));
+	} else {
+		printf("Half\n");
+		outl((ECMR_CHG_DM|ECMR_RE|ECMR_TE),  ECMR(port));
+	}
+	return 0;
+}
+
+static int sh_eth_start(struct dev_info_s *dev)
+{
+	/*
+	 * Enable the e-dmac receiver only. The transmitter will be enabled when
+	 * we have something to transmit
+	 */
+	outl(EDRRR_R, EDRRR(dev->port));
+
+	return 0;
+}
+
+static int sh_eth_get_mac(bd_t *bd)
+{
+	char *s, *e;
+	int i;
+
+	s = getenv("ethaddr");
+	if (s != NULL) {
+		for (i = 0; i < 6; ++i) {
+			bd->bi_enetaddr[i] = s ? simple_strtoul(s, &e, 16) : 0;
+			if (s)
+				s = (*e) ? e + 1 : e;
+		}
+	} else {
+		puts("Please set MAC address\n");
+	}
+	return 0;
+}
+
+int eth_init(bd_t *bd)
+{
+	int rc;
+	/* Allocate main device information structure */
+	if (!(dev = malloc(sizeof(*dev)))) {
+		printf("eth_init: malloc failed\n");
+		return -ENOMEM;
+	}
+
+	memset(dev, 0, sizeof(*dev));
+
+	dev->port = CONFIG_SH_ETHER_USE_PORT;
+	dev->port_info[dev->port].phy_addr = CONFIG_SH_ETHER_PHY_ADDR;
+
+	sh_eth_get_mac(bd);
+
+	if ((rc = sh_eth_reset(dev)) || (rc = sh_eth_desc_init(dev)))
+		goto err;
+
+	if ((rc = sh_eth_config(dev, bd)) || (rc = sh_eth_start(dev)))
+		goto err_desc;
+
+	return 0;
+
+err_desc:
+	sh_eth_desc_free(dev);
+err:
+	free(dev);
+	printf("eth_init: Failed\n");
+	return rc;
+}