[U-Boot] [RFC PATCH v2 5/8] net: Add basic driver model support to Ethernet stack

Joe Hershberger joe.hershberger at ni.com
Tue Feb 3 01:38:42 CET 2015


First just add support for MAC drivers.

Signed-off-by: Joe Hershberger <joe.hershberger at ni.com>

---

Changes in v2:
-Updated comments
-Removed extra parentheses
-Changed eth_uclass_priv local var names to be uc_priv
-Update error codes
-Cause an invalid name to fail binding
-Rebase on top of dm/master
-Stop maintaining our own index and use DM seq now that it works for our needs
-Move the hwaddr to platdata so that its memory is allocated at bind when we need it
-Prevent device from being probed before used by a command (i.e. before eth_init()).

 common/board_r.c       |   4 +-
 common/cmd_bdinfo.c    |   2 +
 include/dm/uclass-id.h |   1 +
 include/net.h          |  24 ++++
 net/eth.c              | 319 ++++++++++++++++++++++++++++++++++++++++++++++++-
 5 files changed, 346 insertions(+), 4 deletions(-)

diff --git a/common/board_r.c b/common/board_r.c
index 68a9448..75147b7 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -556,7 +556,7 @@ static int initr_bbmii(void)
 }
 #endif
 
-#ifdef CONFIG_CMD_NET
+#if defined(CONFIG_CMD_NET) && !defined(CONFIG_DM_ETH)
 static int initr_net(void)
 {
 	puts("Net:   ");
@@ -825,7 +825,7 @@ init_fnc_t init_sequence_r[] = {
 #ifdef CONFIG_BITBANGMII
 	initr_bbmii,
 #endif
-#ifdef CONFIG_CMD_NET
+#if defined(CONFIG_CMD_NET) && !defined(CONFIG_DM_ETH)
 	INIT_FUNC_WATCHDOG_RESET
 	initr_net,
 #endif
diff --git a/common/cmd_bdinfo.c b/common/cmd_bdinfo.c
index e6d8a7a..8688cf9 100644
--- a/common/cmd_bdinfo.c
+++ b/common/cmd_bdinfo.c
@@ -34,6 +34,7 @@ static void print_eth(int idx)
 	printf("%-12s= %s\n", name, val);
 }
 
+#ifndef CONFIG_DM_ETH
 __maybe_unused
 static void print_eths(void)
 {
@@ -52,6 +53,7 @@ static void print_eths(void)
 	printf("current eth = %s\n", eth_get_name());
 	printf("ip_addr     = %s\n", getenv("ipaddr"));
 }
+#endif
 
 __maybe_unused
 static void print_lnum(const char *name, unsigned long long value)
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index 91bb90d..ad96682 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -34,6 +34,7 @@ enum uclass_id {
 	UCLASS_I2C_GENERIC,	/* Generic I2C device */
 	UCLASS_I2C_EEPROM,	/* I2C EEPROM device */
 	UCLASS_MOD_EXP,		/* RSA Mod Exp device */
+	UCLASS_ETH,		/* Ethernet device */
 
 	UCLASS_COUNT,
 	UCLASS_INVALID = -1,
diff --git a/include/net.h b/include/net.h
index 7eef9cc..4d21d91 100644
--- a/include/net.h
+++ b/include/net.h
@@ -78,6 +78,30 @@ enum eth_state_t {
 	ETH_STATE_ACTIVE
 };
 
+#ifdef CONFIG_DM_ETH
+struct eth_pdata {
+	phys_addr_t iobase;
+	unsigned char enetaddr[6];
+};
+
+struct eth_ops {
+	int (*init)(struct udevice *dev, bd_t *bis);
+	int (*send)(struct udevice *dev, void *packet, int length);
+	int (*recv)(struct udevice *dev);
+	void (*halt)(struct udevice *dev);
+#ifdef CONFIG_MCAST_TFTP
+	int (*mcast)(struct udevice *dev, const u8 *enetaddr, u8 set);
+#endif
+	int (*write_hwaddr)(struct udevice *dev);
+};
+
+struct udevice *eth_get_dev(void); /* get the current device */
+unsigned char *eth_get_ethaddr(void); /* get the current device MAC */
+int eth_init_state_only(bd_t *bis); /* Set active state */
+void eth_halt_state_only(void); /* Set passive state */
+#endif
+
+#ifndef CONFIG_DM_ETH
 struct eth_device {
 	char name[16];
 	unsigned char enetaddr[6];
diff --git a/net/eth.c b/net/eth.c
index c02548c..1b5a169 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -72,6 +72,320 @@ static int eth_mac_skip(int index)
 	return ((skip_state = getenv(enetvar)) != NULL);
 }
 
+static void eth_current_changed(void);
+
+#ifdef CONFIG_DM_ETH
+#include <dm.h>
+#include <dm/device-internal.h>
+
+struct eth_device_priv {
+	int state;
+	void *priv;
+};
+
+struct eth_uclass_priv {
+	struct udevice *current;
+};
+
+static void eth_set_current_to_next(void)
+{
+	struct uclass *uc;
+	struct eth_uclass_priv *uc_priv;
+
+	uclass_get(UCLASS_ETH, &uc);
+	uc_priv = uc->priv;
+	uclass_next_device(&uc_priv->current);
+	if (!uc_priv->current)
+		uclass_first_device(UCLASS_ETH, &uc_priv->current);
+}
+
+struct udevice *eth_get_dev(void)
+{
+	struct uclass *uc;
+	uclass_get(UCLASS_ETH, &uc);
+
+	struct eth_uclass_priv *uc_priv = uc->priv;
+	return uc_priv->current;
+}
+
+static void eth_set_dev(struct udevice *dev)
+{
+	struct uclass *uc;
+	uclass_get(UCLASS_ETH, &uc);
+
+	struct eth_uclass_priv *uc_priv = uc->priv;
+	uc_priv->current = dev;
+}
+
+unsigned char *eth_get_ethaddr(void)
+{
+	struct eth_pdata *pdata;
+	if (eth_get_dev()) {
+		pdata = eth_get_dev()->platdata;
+		if (pdata)
+			return pdata->enetaddr;
+	}
+	return NULL;
+}
+
+/* Set active state */
+int eth_init_state_only(bd_t *bis)
+{
+	struct eth_device_priv *priv;
+	if (eth_get_dev()) {
+		priv = eth_get_dev()->uclass_priv;
+		if (priv)
+			priv->state = ETH_STATE_ACTIVE;
+	}
+
+	return 0;
+}
+/* Set passive state */
+void eth_halt_state_only(void)
+{
+	struct eth_device_priv *priv;
+	if (eth_get_dev()) {
+		priv = eth_get_dev()->uclass_priv;
+		if (priv)
+			priv->state = ETH_STATE_PASSIVE;
+	}
+}
+
+int eth_get_dev_index(void)
+{
+	if (eth_get_dev())
+		return eth_get_dev()->seq;
+	return -1;
+}
+
+int eth_init(bd_t *bis)
+{
+	struct udevice *current, *old_current, *dev;
+	struct uclass *uc;
+
+	current = eth_get_dev();
+	if (!current) {
+		puts("No ethernet found.\n");
+		return -1;
+	}
+	device_probe(current);
+
+	/* Sync environment with network devices */
+	uclass_get(UCLASS_ETH, &uc);
+	uclass_foreach_dev(dev, uc) {
+		uchar env_enetaddr[6];
+
+		if (eth_getenv_enetaddr_by_index("eth", dev->seq,
+						 env_enetaddr)) {
+			struct eth_pdata *pdata = dev->platdata;
+			if (pdata)
+				memcpy(pdata->enetaddr, env_enetaddr, 6);
+		}
+	};
+
+	old_current = current;
+	do {
+		debug("Trying %s\n", current->name);
+
+		if (current->driver) {
+			const struct eth_ops *ops = current->driver->ops;
+			if (ops->init(current, bis) >= 0) {
+				struct eth_device_priv *priv =
+					current->uclass_priv;
+				if (priv)
+					priv->state = ETH_STATE_ACTIVE;
+
+				return 0;
+			}
+		}
+		debug("FAIL\n");
+
+		eth_try_another(0);
+		current = eth_get_dev();
+	} while (old_current != current);
+
+	return -ENODEV;
+}
+
+void eth_halt(void)
+{
+	struct udevice *current;
+
+	current = eth_get_dev();
+	if (!current)
+		return;
+	if (!current->driver)
+		return;
+
+	const struct eth_ops *ops = current->driver->ops;
+	ops->halt(current);
+
+	struct eth_device_priv *priv = current->uclass_priv;
+	if (priv)
+		priv->state = ETH_STATE_PASSIVE;
+}
+
+int eth_send(void *packet, int length)
+{
+	struct udevice *current;
+
+	current = eth_get_dev();
+	if (!current)
+		return -1;
+	if (!current->driver)
+		return -1;
+
+	const struct eth_ops *ops = current->driver->ops;
+	return ops->send(current, packet, length);
+}
+
+int eth_rx(void)
+{
+	struct udevice *current;
+
+	current = eth_get_dev();
+	if (!current)
+		return -1;
+	if (!current->driver)
+		return -1;
+
+	const struct eth_ops *ops = current->driver->ops;
+	return ops->recv(current);
+}
+
+static int eth_write_hwaddr(struct udevice *dev, const char *base_name,
+		   int eth_number)
+{
+	unsigned char env_enetaddr[6];
+	int ret = 0;
+
+	eth_getenv_enetaddr_by_index(base_name, eth_number, env_enetaddr);
+
+	struct eth_pdata *pdata = dev->platdata;
+	if (!is_zero_ether_addr(env_enetaddr)) {
+		if (!is_zero_ether_addr(pdata->enetaddr) &&
+		    memcmp(pdata->enetaddr, env_enetaddr, 6)) {
+			printf("\nWarning: %s MAC addresses don't match:\n",
+			       dev->name);
+			printf("Address in SROM is         %pM\n",
+			       pdata->enetaddr);
+			printf("Address in environment is  %pM\n",
+			       env_enetaddr);
+		}
+
+		memcpy(pdata->enetaddr, env_enetaddr, 6);
+	} else if (is_valid_ether_addr(pdata->enetaddr)) {
+		eth_setenv_enetaddr_by_index(base_name, eth_number,
+					     pdata->enetaddr);
+		printf("\nWarning: %s using MAC address from net device\n",
+		       dev->name);
+	} else if (is_zero_ether_addr(pdata->enetaddr)) {
+		printf("\nError: %s address not set.\n",
+		       dev->name);
+		return -EINVAL;
+	}
+
+	const struct eth_ops *ops = dev->driver->ops;
+	if (ops->write_hwaddr && !eth_mac_skip(eth_number)) {
+		if (!is_valid_ether_addr(pdata->enetaddr)) {
+			printf("\nError: %s address %pM illegal value\n",
+			       dev->name, pdata->enetaddr);
+			return -EINVAL;
+		}
+
+		ret = ops->write_hwaddr(dev);
+		if (ret)
+			printf("\nWarning: %s failed to set MAC address\n",
+			       dev->name);
+	}
+
+	return ret;
+}
+
+static int eth_uclass_init(struct uclass *class)
+{
+	bootstage_mark(BOOTSTAGE_ID_NET_ETH_START);
+
+	eth_env_init();
+
+	return 0;
+}
+
+static int eth_post_bind(struct udevice *dev)
+{
+	if (strchr(dev->name, ' ')) {
+		printf("\nError: eth device name \"%s\" has a space!\n",
+		       dev->name);
+		return -EINVAL;
+	}
+
+	if (!eth_get_dev()) {
+		eth_set_dev(dev);
+		eth_current_changed();
+	}
+
+	char *ethprime = getenv("ethprime");
+	if (ethprime && strcmp(dev->name, ethprime) == 0) {
+		eth_set_dev(dev);
+		eth_current_changed();
+	}
+
+	/*
+	 * Devices need to write the hwaddr even if not probed so that Linux
+	 * will have access to the hwaddr that u-boot stored for the device.
+	 */
+	eth_write_hwaddr(dev, "eth", uclass_resolve_seq(dev));
+
+	return 0;
+}
+
+static int eth_pre_unbind(struct udevice *dev)
+{
+	struct udevice *first = NULL;
+	struct udevice *current;
+	struct uclass *uc;
+
+	uclass_get(UCLASS_ETH, &uc);
+	uclass_foreach_dev(current, uc) {
+		if (!first)
+			first = current;
+		if (current == dev) {
+			if (dev == first) {
+				current = list_entry(current->uclass_node.next,
+					   struct udevice, uclass_node);
+			} else {
+				current = first;
+			}
+			eth_set_dev(current);
+			eth_current_changed();
+		}
+	}
+
+	return 0;
+}
+
+static int eth_post_probe(struct udevice *dev)
+{
+	struct eth_device_priv *priv = dev->uclass_priv;
+	if (priv)
+		priv->state = ETH_STATE_INIT;
+
+	return 0;
+}
+
+UCLASS_DRIVER(eth) = {
+	.name		= "eth",
+	.id		= UCLASS_ETH,
+	.post_bind	= eth_post_bind,
+	.pre_unbind	= eth_pre_unbind,
+	.post_probe	= eth_post_probe,
+	.init		= eth_uclass_init,
+	.priv_auto_alloc_size = sizeof(struct eth_uclass_priv),
+	.per_device_auto_alloc_size = sizeof(struct eth_device_priv),
+};
+#endif
+
+#ifndef CONFIG_DM_ETH
 /*
  * CPU and board-specific Ethernet initializations.  Aliased function
  * signals caller to move on
@@ -423,6 +737,7 @@ int eth_rx(void)
 
 	return eth_current->recv(eth_current);
 }
+#endif /* ifndef CONFIG_DM_ETH */
 
 #ifdef CONFIG_API
 static void eth_save_packet(void *packet, int length)
@@ -486,7 +801,7 @@ static void eth_current_changed(void)
 
 void eth_try_another(int first_restart)
 {
-	static struct eth_device *first_failed;
+	static void *first_failed;
 	char *ethrotate;
 
 	/*
@@ -515,7 +830,7 @@ void eth_set_current(void)
 {
 	static char *act;
 	static int  env_changed_id;
-	struct eth_device *old_current;
+	void *old_current;
 	int	env_id;
 
 	if (!eth_get_dev())	/* XXX no current */
-- 
1.7.11.5



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