[U-Boot] [PATCH v5 13/27] dm: eth: Add basic driver model support to Ethernet stack
Joe Hershberger
joe.hershberger at ni.com
Wed Mar 4 03:41:07 CET 2015
First just add support for MAC drivers.
Signed-off-by: Joe Hershberger <joe.hershberger at ni.com>
---
Changes in v5:
-Add a note to doc/README.drivers.eth about its obsolescence
-Expanded the Kconfig help
-Moved dm/ header
-Use local var for priv in eth_get_dev()
Changes in v4:
--Don't prevent eth_initialize on driver model
--If current == NULL, always check if there is a device available in eth_get_dev
--Include ethprime handling in eth_initialize
--Look up MAC address in post-probe
--Move env init call from uclass init to eth_initialize
--Print the alias in eth_initialize
--Use eth_initialize to probe all devices and write_hwaddr
-Add a helper function for eth_uclass_priv
-Add documentation to the structures
-Add eth_get_ops helper
-Change -1 returns to error constants
-Change puts to printf
-Redo the seq / probe implementation
-Remove bd_t *bis from dm eth_ops init function
-Remove checks for driver==NULL
-Remove priv pointer in per-device priv struct (drivers already get their own directly from DM)
-Rename halt() to stop() in ops
-Rename init() to start() in ops
-Stop handling selecting a new "current" in pre-unbind as it will now work itself out by clearing the pointer
Changes in v3:
--Fail init if not activated
--Fail probe if ethaddr not set
-Allow current eth dev to be NULL
-Correct failure chaining from bind to probe to init
-Correct the pre_unbind logic
-Fixed blank line formatting for variable declaration
-Update ethaddr from env unconditionally on init
-Use set current to select the current device regardless of the previous selection
Changes in v2:
-Cause an invalid name to fail binding
-Changed eth_uclass_priv local var names to be uc_priv
-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()).
-Rebase on top of dm/master
-Removed extra parentheses
-Stop maintaining our own index and use DM seq now that it works for our needs
-Update error codes
-Updated comments
common/cmd_bdinfo.c | 2 +
doc/README.drivers.eth | 6 +
drivers/net/Kconfig | 9 ++
include/dm/uclass-id.h | 1 +
include/net.h | 52 ++++++++
net/eth.c | 346 ++++++++++++++++++++++++++++++++++++++++++++++++-
6 files changed, 410 insertions(+), 6 deletions(-)
diff --git a/common/cmd_bdinfo.c b/common/cmd_bdinfo.c
index aa81da2..b4cce25 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/doc/README.drivers.eth b/doc/README.drivers.eth
index eb83038..98728bc 100644
--- a/doc/README.drivers.eth
+++ b/doc/README.drivers.eth
@@ -1,3 +1,9 @@
+!!! WARNING !!!
+
+This guide describes to the old way of doing things. No new Ethernet drivers
+should be implemented this way. All new drivers should be written against the
+U-Boot core driver model. See doc/driver-model/README.txt
+
-----------------------
Ethernet Driver Guide
-----------------------
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index e69de29..94cf099 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -0,0 +1,9 @@
+config DM_ETH
+ bool "Enable Driver Model for Ethernet drivers"
+ depends on DM
+ help
+ Enable driver model for Ethernet.
+
+ The eth_*() interface will be implemented by the UC_ETH class
+ This is currently implemented in net/eth.c
+ Look in include/net.h for details.
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 10d38f8..508c572 100644
--- a/include/net.h
+++ b/include/net.h
@@ -78,6 +78,57 @@ enum eth_state_t {
ETH_STATE_ACTIVE
};
+#ifdef CONFIG_DM_ETH
+/**
+ * struct eth_pdata - Platform data for Ethernet MAC controllers
+ *
+ * @iobase: The base address of the hardware registers
+ * @enetaddr: The Ethernet MAC address that is loaded from EEPROM or env
+ */
+struct eth_pdata {
+ phys_addr_t iobase;
+ unsigned char enetaddr[6];
+};
+
+/**
+ * struct eth_ops - functions of Ethernet MAC controllers
+ *
+ * start: Prepare the hardware to send and receive packets
+ * send: Send the bytes passed in "packet" as a packet on the wire
+ * recv: Check if the hardware received a packet. Call the network stack if so
+ * stop: Stop the hardware from looking for packets - may be called even if
+ * state == PASSIVE
+ * mcast: Join or leave a multicast group (for TFTP) - optional
+ * write_hwaddr: Write a MAC address to the hardware (used to pass it to Linux
+ * on some platforms like ARM). This function expects the
+ * eth_pdata::enetaddr field to be populated - optional
+ * read_rom_hwaddr: Some devices have a backup of the MAC address stored in a
+ * ROM on the board. This is how the driver should expose it
+ * to the network stack. This function should fill in the
+ * eth_pdata::enetaddr field - optional
+ */
+struct eth_ops {
+ int (*start)(struct udevice *dev);
+ int (*send)(struct udevice *dev, void *packet, int length);
+ int (*recv)(struct udevice *dev);
+ void (*stop)(struct udevice *dev);
+#ifdef CONFIG_MCAST_TFTP
+ int (*mcast)(struct udevice *dev, const u8 *enetaddr, int join);
+#endif
+ int (*write_hwaddr)(struct udevice *dev);
+ int (*read_rom_hwaddr)(struct udevice *dev);
+};
+
+#define eth_get_ops(dev) ((struct eth_ops *)(dev)->driver->ops)
+
+struct udevice *eth_get_dev(void); /* get the current device */
+unsigned char *eth_get_ethaddr(void); /* get the current device MAC */
+/* Used only when NetConsole is enabled */
+int eth_init_state_only(void); /* 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];
@@ -144,6 +195,7 @@ int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
int eth_number);
int usb_eth_initialize(bd_t *bi);
+#endif
int eth_initialize(void); /* Initialize network subsystem */
void eth_try_another(int first_restart); /* Change the device */
diff --git a/net/eth.c b/net/eth.c
index 66ecb79..1abf027 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -1,16 +1,19 @@
/*
- * (C) Copyright 2001-2010
+ * (C) Copyright 2001-2015
* Wolfgang Denk, DENX Software Engineering, wd at denx.de.
+ * Joe Hershberger, National Instruments
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
+#include <dm.h>
#include <net.h>
#include <miiphy.h>
#include <phy.h>
#include <asm/errno.h>
+#include <dm/device-internal.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -76,6 +79,339 @@ static int eth_mac_skip(int index)
static void eth_current_changed(void);
+#ifdef CONFIG_DM_ETH
+/**
+ * struct eth_device_priv - private structure for each Ethernet device
+ *
+ * @state: The state of the Ethernet MAC driver (defined by enum eth_state_t)
+ */
+struct eth_device_priv {
+ enum eth_state_t state;
+};
+
+/**
+ * struct eth_uclass_priv - The structure attached to the uclass itself
+ *
+ * @current: The Ethernet device that the network functions are using
+ */
+struct eth_uclass_priv {
+ struct udevice *current;
+};
+
+static struct eth_uclass_priv *eth_get_uclass_priv(void)
+{
+ struct uclass *uc;
+
+ uclass_get(UCLASS_ETH, &uc);
+ assert(uc);
+ return uc->priv;
+}
+
+static void eth_set_current_to_next(void)
+{
+ struct eth_uclass_priv *uc_priv;
+
+ uc_priv = eth_get_uclass_priv();
+ if (uc_priv->current)
+ 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 eth_uclass_priv *uc_priv;
+
+ uc_priv = eth_get_uclass_priv();
+ if (!uc_priv->current)
+ uclass_first_device(UCLASS_ETH,
+ &uc_priv->current);
+ return uc_priv->current;
+}
+
+static void eth_set_dev(struct udevice *dev)
+{
+ device_probe(dev);
+ eth_get_uclass_priv()->current = dev;
+}
+
+unsigned char *eth_get_ethaddr(void)
+{
+ struct eth_pdata *pdata;
+
+ if (eth_get_dev()) {
+ pdata = eth_get_dev()->platdata;
+ return pdata->enetaddr;
+ }
+
+ return NULL;
+}
+
+/* Set active state without calling start on the driver */
+int eth_init_state_only(void)
+{
+ struct udevice *current;
+ struct eth_device_priv *priv;
+
+ current = eth_get_dev();
+ if (!current || !device_active(current))
+ return -EINVAL;
+
+ priv = current->uclass_priv;
+ priv->state = ETH_STATE_ACTIVE;
+
+ return 0;
+}
+
+/* Set passive state without calling stop on the driver */
+void eth_halt_state_only(void)
+{
+ struct udevice *current;
+ struct eth_device_priv *priv;
+
+ current = eth_get_dev();
+ if (!current || !device_active(current))
+ return;
+
+ priv = current->uclass_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(void)
+{
+ struct udevice *current;
+ struct udevice *old_current;
+
+ current = eth_get_dev();
+ if (!current) {
+ printf("No ethernet found.\n");
+ return -ENODEV;
+ }
+
+ old_current = current;
+ do {
+ debug("Trying %s\n", current->name);
+
+ if (device_active(current)) {
+ uchar env_enetaddr[6];
+ struct eth_pdata *pdata = current->platdata;
+
+ /* Sync environment with network device */
+ if (eth_getenv_enetaddr_by_index("eth", current->seq,
+ env_enetaddr))
+ memcpy(pdata->enetaddr, env_enetaddr, 6);
+ else
+ memset(pdata->enetaddr, 0, 6);
+
+ if (eth_get_ops(current)->start(current) >= 0) {
+ struct eth_device_priv *priv =
+ current->uclass_priv;
+
+ priv->state = ETH_STATE_ACTIVE;
+ return 0;
+ }
+ }
+ debug("FAIL\n");
+
+ /* This will ensure the new "current" attempted to probe */
+ eth_try_another(0);
+ current = eth_get_dev();
+ } while (old_current != current);
+
+ return -ENODEV;
+}
+
+void eth_halt(void)
+{
+ struct udevice *current;
+ struct eth_device_priv *priv;
+
+ current = eth_get_dev();
+ if (!current || !device_active(current))
+ return;
+
+ eth_get_ops(current)->stop(current);
+ priv = current->uclass_priv;
+ priv->state = ETH_STATE_PASSIVE;
+}
+
+int eth_send(void *packet, int length)
+{
+ struct udevice *current;
+
+ current = eth_get_dev();
+ if (!current)
+ return -ENODEV;
+
+ if (!device_active(current))
+ return -EINVAL;
+
+ return eth_get_ops(current)->send(current, packet, length);
+}
+
+int eth_rx(void)
+{
+ struct udevice *current;
+
+ current = eth_get_dev();
+ if (!current)
+ return -ENODEV;
+
+ if (!device_active(current))
+ return -EINVAL;
+
+ return eth_get_ops(current)->recv(current);
+}
+
+static int eth_write_hwaddr(struct udevice *dev)
+{
+ struct eth_pdata *pdata = dev->platdata;
+ int ret = 0;
+
+ if (!dev || !device_active(dev))
+ return -EINVAL;
+
+ /* seq is valid since the device is active */
+ if (eth_get_ops(dev)->write_hwaddr && !eth_mac_skip(dev->seq)) {
+ if (!is_valid_ether_addr(pdata->enetaddr)) {
+ printf("\nError: %s address %pM illegal value\n",
+ dev->name, pdata->enetaddr);
+ return -EINVAL;
+ }
+
+ ret = eth_get_ops(dev)->write_hwaddr(dev);
+ if (ret)
+ printf("\nWarning: %s failed to set MAC address\n",
+ dev->name);
+ }
+
+ return ret;
+}
+
+int eth_initialize(void)
+{
+ int num_devices = 0;
+ struct udevice *dev;
+
+ bootstage_mark(BOOTSTAGE_ID_NET_ETH_START);
+ eth_env_init();
+
+ /*
+ * Devices need to write the hwaddr even if not started so that Linux
+ * will have access to the hwaddr that u-boot stored for the device.
+ * This is accomplished by attempting to probe each device and calling
+ * their write_hwaddr() operation.
+ */
+ uclass_first_device(UCLASS_ETH, &dev);
+ if (!dev) {
+ printf("No ethernet found.\n");
+ bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
+ } else {
+ bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
+ do {
+ if (num_devices)
+ printf(", ");
+
+ printf("eth%d: %s", dev->seq, dev->name);
+
+ eth_write_hwaddr(dev);
+
+ uclass_next_device(&dev);
+ num_devices++;
+ } while (dev);
+
+ putc('\n');
+ }
+
+ return num_devices;
+}
+
+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;
+ }
+
+ return 0;
+}
+
+static int eth_pre_unbind(struct udevice *dev)
+{
+ /* Don't hang onto a pointer that is going away */
+ if (dev == eth_get_uclass_priv()->current)
+ eth_set_dev(NULL);
+
+ return 0;
+}
+
+static int eth_post_probe(struct udevice *dev)
+{
+ struct eth_device_priv *priv = dev->uclass_priv;
+ struct eth_pdata *pdata = dev->platdata;
+ unsigned char env_enetaddr[6];
+
+ priv->state = ETH_STATE_INIT;
+
+ /* Check if the device has a MAC address in ROM */
+ if (eth_get_ops(dev)->read_rom_hwaddr)
+ eth_get_ops(dev)->read_rom_hwaddr(dev);
+
+ eth_getenv_enetaddr_by_index("eth", dev->seq, env_enetaddr);
+ 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);
+ }
+
+ /* Override the ROM MAC address */
+ memcpy(pdata->enetaddr, env_enetaddr, 6);
+ } else if (is_valid_ether_addr(pdata->enetaddr)) {
+ eth_setenv_enetaddr_by_index("eth", dev->seq, pdata->enetaddr);
+ printf("\nWarning: %s using MAC address from ROM\n",
+ dev->name);
+ } else if (is_zero_ether_addr(pdata->enetaddr)) {
+ printf("\nError: %s address not set.\n",
+ dev->name);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int eth_pre_remove(struct udevice *dev)
+{
+ eth_get_ops(dev)->stop(dev);
+
+ 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,
+ .pre_remove = eth_pre_remove,
+ .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
@@ -427,6 +763,7 @@ 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)
@@ -490,7 +827,7 @@ 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;
/*
@@ -519,12 +856,9 @@ 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 */
- return;
-
env_id = get_env_id();
if ((act == NULL) || (env_changed_id != env_id)) {
act = getenv("ethact");
--
1.7.11.5
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