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https://github.com/AsahiLinux/u-boot
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434 lines
14 KiB
Text
434 lines
14 KiB
Text
The U-Boot Driver Model Project
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===============================
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Net system analysis
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===================
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Marek Vasut <marek.vasut@gmail.com>
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2012-03-03
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I) Overview
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-----------
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The networking subsystem already supports multiple devices. Therefore the
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conversion shall not be very hard.
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The network subsystem is operated from net/eth.c, which tracks all registered
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ethernet interfaces and calls their particular functions registered via
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eth_register().
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The eth_register() is called from the network driver initialization function,
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which in turn is called most often either from "board_net_init()" or
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"cpu_net_init()". This function has one important argument, which is the
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"struct eth_device", defined at include/net.h:
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struct eth_device {
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/* DRIVER: Name of the device */
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char name[NAMESIZE];
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/* DRIVER: MAC address */
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unsigned char enetaddr[6];
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/* DRIVER: Register base address */
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int iobase;
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/* CORE: state of the device */
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int state;
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/* DRIVER: Device initialization function */
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int (*init) (struct eth_device*, bd_t*);
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/* DRIVER: Function for sending packets */
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int (*send) (struct eth_device*, volatile void* packet, int length);
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/* DRIVER: Function for receiving packets */
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int (*recv) (struct eth_device*);
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/* DRIVER: Function to cease operation of the device */
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void (*halt) (struct eth_device*);
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/* DRIVER: Function to send multicast packet (OPTIONAL) */
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int (*mcast) (struct eth_device*, u32 ip, u8 set);
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/* DRIVER: Function to change ethernet MAC address */
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int (*write_hwaddr) (struct eth_device*);
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/* CORE: Next device in the linked list of devices managed by net core */
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struct eth_device *next;
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/* CORE: Device index */
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int index;
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/* DRIVER: Driver's private data */
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void *priv;
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};
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This structure defines the particular driver, though also contains elements that
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should not be exposed to the driver, like core state.
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Small, but important part of the networking subsystem is the PHY management
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layer, whose drivers are contained in drivers/net/phy. These drivers register in
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a very similar manner to network drivers, by calling "phy_register()" with the
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argument of "struct phy_driver":
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struct phy_driver {
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/* DRIVER: Name of the PHY driver */
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char *name;
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/* DRIVER: UID of the PHY driver */
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unsigned int uid;
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/* DRIVER: Mask for UID of the PHY driver */
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unsigned int mask;
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/* DRIVER: MMDS of the PHY driver */
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unsigned int mmds;
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/* DRIVER: Features the PHY driver supports */
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u32 features;
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/* DRIVER: Initialize the PHY hardware */
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int (*probe)(struct phy_device *phydev);
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/* DRIVER: Reconfigure the PHY hardware */
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int (*config)(struct phy_device *phydev);
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/* DRIVER: Turn on the PHY hardware, allow it to send/receive */
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int (*startup)(struct phy_device *phydev);
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/* DRIVER: Turn off the PHY hardware */
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int (*shutdown)(struct phy_device *phydev);
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/* CORE: Allows this driver to be part of list of drivers */
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struct list_head list;
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};
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II) Approach
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------------
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To convert the elements of network subsystem to proper driver model method, the
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"struct eth_device" will have to be split into multiple components. The first
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will be a structure defining the driver operations:
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struct eth_driver_ops {
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int (*init)(struct instance*, bd_t*);
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int (*send)(struct instance*, void *packet, int length);
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int (*recv)(struct instance*);
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void (*halt)(struct instance*);
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int (*mcast)(struct instance*, u32 ip, u8 set);
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int (*write_hwaddr)(struct instance*);
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};
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Next, there'll be platform data which will be per-driver and will replace the
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"priv" part of "struct eth_device". Last part will be the per-device core state.
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With regards to the PHY part of the API, the "struct phy_driver" is almost ready
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to be used with the new driver model approach. The only change will be the
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replacement of per-driver initialization functions and removal of
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"phy_register()" function in favor or driver model approach.
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III) Analysis of in-tree drivers
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--------------------------------
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1) drivers/net/4xx_enet.c
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-------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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2) drivers/net/altera_tse.c
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---------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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3) drivers/net/armada100_fec.c
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------------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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4) drivers/net/at91_emac.c
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--------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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5) drivers/net/ax88180.c
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------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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6) drivers/net/ax88796.c
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------------------------
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This file contains a components of the NE2000 driver, implementing only
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different parts on the NE2000 clone AX88796. This being no standalone driver,
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no conversion will be done here.
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7) drivers/net/bfin_mac.c
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-------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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8) drivers/net/calxedaxgmac.c
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-----------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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9) drivers/net/cs8900.c
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-----------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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10) drivers/net/davinci_emac.c
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------------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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11) drivers/net/dc2114x.c
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-------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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12) drivers/net/designware.c
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----------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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13) drivers/net/dm9000x.c
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-------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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14) drivers/net/dnet.c
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----------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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15) drivers/net/e1000.c
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-----------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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16) drivers/net/e1000_spi.c
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---------------------------
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Driver for the SPI bus integrated on the Intel E1000. This is not part of the
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network stack.
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17) drivers/net/eepro100.c
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--------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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18) drivers/net/enc28j60.c
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--------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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19) drivers/net/ep93xx_eth.c
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----------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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20) drivers/net/ethoc.c
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-----------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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21) drivers/net/fec_mxc.c
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-------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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22) drivers/net/fsl_mcdmafec.c
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------------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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23) drivers/net/fsl_mdio.c
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--------------------------
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This file contains driver for FSL MDIO interface, which is not part of the
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networking stack.
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24) drivers/net/ftgmac100.c
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---------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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25) drivers/net/ftmac100.c
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--------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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26) drivers/net/greth.c
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-----------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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27) drivers/net/inca-ip_sw.c
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----------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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28) drivers/net/ks8695eth.c
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---------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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29) drivers/net/lan91c96.c
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--------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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30) drivers/net/macb.c
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----------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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31) drivers/net/mcffec.c
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------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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32) drivers/net/mcfmii.c
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------------------------
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This file contains MII interface driver for MCF FEC.
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33) drivers/net/mpc512x_fec.c
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-----------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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34) drivers/net/mpc5xxx_fec.c
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-----------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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35) drivers/net/mvgbe.c
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-----------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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36) drivers/net/natsemi.c
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-------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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37) drivers/net/ne2000_base.c
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-----------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process. This driver contains the core
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implementation of NE2000, which needs a few external functions, implemented by
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AX88796, NE2000 etc.
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38) drivers/net/ne2000.c
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------------------------
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This file implements external functions necessary for native NE2000 compatible
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networking card to work.
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39) drivers/net/netarm_eth.c
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----------------------------
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This driver uses the old, legacy, network API and will either have to be
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converted or removed.
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40) drivers/net/netconsole.c
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----------------------------
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This is actually an STDIO driver.
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41) drivers/net/ns8382x.c
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-------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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42) drivers/net/pcnet.c
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-----------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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43) drivers/net/plb2800_eth.c
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-----------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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44) drivers/net/rtl8139.c
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-------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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45) drivers/net/rtl8169.c
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-------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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46) drivers/net/sh_eth.c
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------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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47) drivers/net/smc91111.c
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--------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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48) drivers/net/smc911x.c
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-------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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49) drivers/net/tsec.c
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----------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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50) drivers/net/tsi108_eth.c
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----------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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51) drivers/net/uli526x.c
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-------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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52) drivers/net/vsc7385.c
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-------------------------
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This is a driver that only uploads firmware to a switch. This is not subject
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of conversion.
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53) drivers/net/xilinx_axi_emac.c
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---------------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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54) drivers/net/xilinx_emaclite.c
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---------------------------------
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This driver uses the standard new networking API, therefore there should be no
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obstacles throughout the conversion process.
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