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Diffstat (limited to 'doc/driver-model/UDM-net.txt')
| -rw-r--r-- | doc/driver-model/UDM-net.txt | 428 |
1 files changed, 0 insertions, 428 deletions
diff --git a/doc/driver-model/UDM-net.txt b/doc/driver-model/UDM-net.txt deleted file mode 100644 index 097ed69..0000000 --- a/doc/driver-model/UDM-net.txt +++ /dev/null @@ -1,428 +0,0 @@ -The U-Boot Driver Model Project -=============================== -Net system analysis -=================== -Marek Vasut <marek.vasut@gmail.com> -2012-03-03 - -I) Overview ------------ - -The networking subsystem already supports multiple devices. Therefore the -conversion shall not be very hard. - -The network subsystem is operated from net/eth.c, which tracks all registered -ethernet interfaces and calls their particular functions registered via -eth_register(). - -The eth_register() is called from the network driver initialization function, -which in turn is called most often either from "board_net_init()" or -"cpu_net_init()". This function has one important argument, which is the -"struct eth_device", defined at include/net.h: - -struct eth_device { - /* DRIVER: Name of the device */ - char name[NAMESIZE]; - /* DRIVER: MAC address */ - unsigned char enetaddr[6]; - /* DRIVER: Register base address */ - int iobase; - /* CORE: state of the device */ - int state; - - /* DRIVER: Device initialization function */ - int (*init) (struct eth_device*, bd_t*); - /* DRIVER: Function for sending packets */ - int (*send) (struct eth_device*, volatile void* packet, int length); - /* DRIVER: Function for receiving packets */ - int (*recv) (struct eth_device*); - /* DRIVER: Function to cease operation of the device */ - void (*halt) (struct eth_device*); - /* DRIVER: Function to send multicast packet (OPTIONAL) */ - int (*mcast) (struct eth_device*, u32 ip, u8 set); - /* DRIVER: Function to change ethernet MAC address */ - int (*write_hwaddr) (struct eth_device*); - /* CORE: Next device in the linked list of devices managed by net core */ - struct eth_device *next; - /* CORE: Device index */ - int index; - /* DRIVER: Driver's private data */ - void *priv; -}; - -This structure defines the particular driver, though also contains elements that -should not be exposed to the driver, like core state. - -Small, but important part of the networking subsystem is the PHY management -layer, whose drivers are contained in drivers/net/phy. These drivers register in -a very similar manner to network drivers, by calling "phy_register()" with the -argument of "struct phy_driver": - -struct phy_driver { - /* DRIVER: Name of the PHY driver */ - char *name; - /* DRIVER: UID of the PHY driver */ - unsigned int uid; - /* DRIVER: Mask for UID of the PHY driver */ - unsigned int mask; - /* DRIVER: MMDS of the PHY driver */ - unsigned int mmds; - /* DRIVER: Features the PHY driver supports */ - u32 features; - /* DRIVER: Initialize the PHY hardware */ - int (*probe)(struct phy_device *phydev); - /* DRIVER: Reconfigure the PHY hardware */ - int (*config)(struct phy_device *phydev); - /* DRIVER: Turn on the PHY hardware, allow it to send/receive */ - int (*startup)(struct phy_device *phydev); - /* DRIVER: Turn off the PHY hardware */ - int (*shutdown)(struct phy_device *phydev); - /* CORE: Allows this driver to be part of list of drivers */ - struct list_head list; -}; - -II) Approach ------------- - -To convert the elements of network subsystem to proper driver model method, the -"struct eth_device" will have to be split into multiple components. The first -will be a structure defining the driver operations: - -struct eth_driver_ops { - int (*init)(struct instance*, bd_t*); - int (*send)(struct instance*, void *packet, int length); - int (*recv)(struct instance*); - void (*halt)(struct instance*); - int (*mcast)(struct instance*, u32 ip, u8 set); - int (*write_hwaddr)(struct instance*); -}; - -Next, there'll be platform data which will be per-driver and will replace the -"priv" part of "struct eth_device". Last part will be the per-device core state. - -With regards to the PHY part of the API, the "struct phy_driver" is almost ready -to be used with the new driver model approach. The only change will be the -replacement of per-driver initialization functions and removal of -"phy_register()" function in favor or driver model approach. - -III) Analysis of in-tree drivers --------------------------------- - - drivers/net/4xx_enet.c - ---------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/altera_tse.c - ------------------------ - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/armada100_fec.c - --------------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/at91_emac.c - ----------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/ax88180.c - --------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/ax88796.c - --------------------- - - This file contains a components of the NE2000 driver, implementing only - different parts on the NE2000 clone AX88796. This being no standalone driver, - no conversion will be done here. - - drivers/net/bfin_mac.c - ---------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/calxedaxgmac.c - -------------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/cs8900.c - -------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/davinci_emac.c - -------------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/dc2114x.c - --------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/designware.c - ------------------------ - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/dm9000x.c - --------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/dnet.c - ------------------ - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/e1000.c - ------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/e1000_spi.c - ----------------------- - - Driver for the SPI bus integrated on the Intel E1000. This is not part of the - network stack. - - drivers/net/eepro100.c - ---------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/enc28j60.c - ---------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/ep93xx_eth.c - ------------------------ - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/ethoc.c - ------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/fec_mxc.c - --------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/fsl_mcdmafec.c - -------------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/fsl_mdio.c - ---------------------- - - This file contains driver for FSL MDIO interface, which is not part of the - networking stack. - - drivers/net/ftgmac100.c - ----------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/ftmac100.c - ---------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/greth.c - ------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/inca-ip_sw.c - ------------------------ - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/ks8695eth.c - ----------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/lan91c96.c - ---------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/macb.c - ------------------ - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/mcffec.c - -------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/mcfmii.c - -------------------- - - This file contains MII interface driver for MCF FEC. - - drivers/net/mpc512x_fec.c - ------------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/mpc5xxx_fec.c - ------------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/mvgbe.c - ------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/natsemi.c - --------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/ne2000_base.c - ------------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. This driver contains the core - implementation of NE2000, which needs a few external functions, implemented by - AX88796, NE2000 etc. - - drivers/net/ne2000.c - -------------------- - - This file implements external functions necessary for native NE2000 compatible - networking card to work. - - drivers/net/netconsole.c - ------------------------ - - This is actually an STDIO driver. - - drivers/net/ns8382x.c - --------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/pcnet.c - ------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/plb2800_eth.c - ------------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/rtl8139.c - --------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/rtl8169.c - --------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/sh_eth.c - -------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/smc91111.c - ---------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/smc911x.c - --------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/tsec.c - ------------------ - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/tsi108_eth.c - ------------------------ - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/uli526x.c - --------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/vsc7385.c - --------------------- - - This is a driver that only uploads firmware to a switch. This is not subject - of conversion. - - drivers/net/xilinx_axi_emac.c - ----------------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. - - drivers/net/xilinx_emaclite.c - ----------------------------- - - This driver uses the standard new networking API, therefore there should be no - obstacles throughout the conversion process. |