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authorGiuseppe CAVALLARO <peppe.cavallaro@st.com>2011-07-20 04:05:24 +0400
committerDavid S. Miller <davem@davemloft.net>2011-07-22 02:29:16 +0400
commit557e2a394de0d142ba930ff3cdb2909419414e06 (patch)
treefbc670fe5840b9c75fbd02518cb984391b80dfa5 /Documentation/networking
parent36bcfe7d74782c07f601edc4831f6b1ef40e9e43 (diff)
downloadlinux-557e2a394de0d142ba930ff3cdb2909419414e06.tar.xz
stmmac: improve and up-to-date the documentation
This patch adds new information for the driver especially about its platform structure fields. Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
-rw-r--r--Documentation/networking/stmmac.txt200
1 files changed, 136 insertions, 64 deletions
diff --git a/Documentation/networking/stmmac.txt b/Documentation/networking/stmmac.txt
index 80a7a3454902..57a24108b845 100644
--- a/Documentation/networking/stmmac.txt
+++ b/Documentation/networking/stmmac.txt
@@ -7,7 +7,7 @@ This is the driver for the MAC 10/100/1000 on-chip Ethernet controllers
(Synopsys IP blocks); it has been fully tested on STLinux platforms.
Currently this network device driver is for all STM embedded MAC/GMAC
-(7xxx SoCs). Other platforms start using it i.e. ARM SPEAr.
+(i.e. 7xxx/5xxx SoCs) and it's known working on other platforms i.e. ARM SPEAr.
DWC Ether MAC 10/100/1000 Universal version 3.41a and DWC Ether MAC 10/100
Universal version 4.0 have been used for developing the first code
@@ -71,7 +71,7 @@ Several performance tests on STM platforms showed this optimisation allows to sp
the CPU while having the maximum throughput.
4.4) WOL
-Wake up on Lan feature through Magic Frame is only supported for the GMAC
+Wake up on Lan feature through Magic and Unicast frames are supported for the GMAC
core.
4.5) DMA descriptors
@@ -91,11 +91,15 @@ LRO is not supported.
The driver is compatible with PAL to work with PHY and GPHY devices.
4.9) Platform information
-Several information came from the platform; please refer to the
-driver's Header file in include/linux directory.
+Several driver's information can be passed through the platform
+These are included in the include/linux/stmmac.h header file
+and detailed below as well:
-struct plat_stmmacenet_data {
+ struct plat_stmmacenet_data {
int bus_id;
+ int phy_addr;
+ int interface;
+ struct stmmac_mdio_bus_data *mdio_bus_data;
int pbl;
int clk_csr;
int has_gmac;
@@ -103,67 +107,135 @@ struct plat_stmmacenet_data {
int tx_coe;
int bugged_jumbo;
int pmt;
- void (*fix_mac_speed)(void *priv, unsigned int speed);
- void (*bus_setup)(unsigned long ioaddr);
-#ifdef CONFIG_STM_DRIVERS
- struct stm_pad_config *pad_config;
-#endif
- void *bsp_priv;
-};
+ int force_sf_dma_mode;
+ void (*fix_mac_speed)(void *priv, unsigned int speed);
+ void (*bus_setup)(void __iomem *ioaddr);
+ int (*init)(struct platform_device *pdev);
+ void (*exit)(struct platform_device *pdev);
+ void *bsp_priv;
+ };
Where:
-- pbl (Programmable Burst Length) is maximum number of
- beats to be transferred in one DMA transaction.
- GMAC also enables the 4xPBL by default.
-- fix_mac_speed and bus_setup are used to configure internal target
- registers (on STM platforms);
-- has_gmac: GMAC core is on board (get it at run-time in the next step);
-- bus_id: bus identifier.
-- tx_coe: core is able to perform the tx csum in HW.
-- enh_desc: if sets the MAC will use the enhanced descriptor structure.
-- clk_csr: CSR Clock range selection.
-- bugged_jumbo: some HWs are not able to perform the csum in HW for
- over-sized frames due to limited buffer sizes. Setting this
- flag the csum will be done in SW on JUMBO frames.
-
-struct plat_stmmacphy_data {
- int bus_id;
- int phy_addr;
- unsigned int phy_mask;
- int interface;
- int (*phy_reset)(void *priv);
- void *priv;
-};
+ o bus_id: bus identifier.
+ o phy_addr: the physical address can be passed from the platform.
+ If it is set to -1 the driver will automatically
+ detect it at run-time by probing all the 32 addresses.
+ o interface: PHY device's interface.
+ o mdio_bus_data: specific platform fields for the MDIO bus.
+ o pbl: the Programmable Burst Length is maximum number of beats to
+ be transferred in one DMA transaction.
+ GMAC also enables the 4xPBL by default.
+ o clk_csr: CSR Clock range selection.
+ o has_gmac: uses the GMAC core.
+ o enh_desc: if sets the MAC will use the enhanced descriptor structure.
+ o tx_coe: core is able to perform the tx csum in HW.
+ o bugged_jumbo: some HWs are not able to perform the csum in HW for
+ over-sized frames due to limited buffer sizes.
+ Setting this flag the csum will be done in SW on
+ JUMBO frames.
+ o pmt: core has the embedded power module (optional).
+ o force_sf_dma_mode: force DMA to use the Store and Forward mode
+ instead of the Threshold.
+ o fix_mac_speed: this callback is used for modifying some syscfg registers
+ (on ST SoCs) according to the link speed negotiated by the
+ physical layer .
+ o bus_setup: perform HW setup of the bus. For example, on some ST platforms
+ this field is used to configure the AMBA bridge to generate more
+ efficient STBus traffic.
+ o init/exit: callbacks used for calling a custom initialisation;
+ this is sometime necessary on some platforms (e.g. ST boxes)
+ where the HW needs to have set some PIO lines or system cfg
+ registers.
+ o custom_cfg: this is a custom configuration that can be passed while
+ initialising the resources.
+
+The we have:
+
+ struct stmmac_mdio_bus_data {
+ int bus_id;
+ int (*phy_reset)(void *priv);
+ unsigned int phy_mask;
+ int *irqs;
+ int probed_phy_irq;
+ };
Where:
-- bus_id: bus identifier;
-- phy_addr: physical address used for the attached phy device;
- set it to -1 to get it at run-time;
-- interface: physical MII interface mode;
-- phy_reset: hook to reset HW function.
-
-SOURCES:
-- Kconfig
-- Makefile
-- stmmac_main.c: main network device driver;
-- stmmac_mdio.c: mdio functions;
-- stmmac_ethtool.c: ethtool support;
-- stmmac_timer.[ch]: timer code used for mitigating the driver dma interrupts
- Only tested on ST40 platforms based.
-- stmmac.h: private driver structure;
-- common.h: common definitions and VFTs;
-- descs.h: descriptor structure definitions;
-- dwmac1000_core.c: GMAC core functions;
-- dwmac1000_dma.c: dma functions for the GMAC chip;
-- dwmac1000.h: specific header file for the GMAC;
-- dwmac100_core: MAC 100 core and dma code;
-- dwmac100_dma.c: dma funtions for the MAC chip;
-- dwmac1000.h: specific header file for the MAC;
-- dwmac_lib.c: generic DMA functions shared among chips
-- enh_desc.c: functions for handling enhanced descriptors
-- norm_desc.c: functions for handling normal descriptors
-
-TODO:
-- XGMAC controller is not supported.
-- Review the timer optimisation code to use an embedded device that seems to be
+ o bus_id: bus identifier;
+ o phy_reset: hook to reset the phy device attached to the bus.
+ o phy_mask: phy mask passed when register the MDIO bus within the driver.
+ o irqs: list of IRQs, one per PHY.
+ o probed_phy_irq: if irqs is NULL, use this for probed PHY.
+
+Below an example how the structures above are using on ST platforms.
+
+ static struct plat_stmmacenet_data stxYYY_ethernet_platform_data = {
+ .pbl = 32,
+ .has_gmac = 0,
+ .enh_desc = 0,
+ .fix_mac_speed = stxYYY_ethernet_fix_mac_speed,
+ |
+ |-> to write an internal syscfg
+ | on this platform when the
+ | link speed changes from 10 to
+ | 100 and viceversa
+ .init = &stmmac_claim_resource,
+ |
+ |-> On ST SoC this calls own "PAD"
+ | manager framework to claim
+ | all the resources necessary
+ | (GPIO ...). The .custom_cfg field
+ | is used to pass a custom config.
+};
+
+Below the usage of the stmmac_mdio_bus_data: on this SoC, in fact,
+there are two MAC cores: one MAC is for MDIO Bus/PHY emulation
+with fixed_link support.
+
+static struct stmmac_mdio_bus_data stmmac1_mdio_bus = {
+ .bus_id = 1,
+ |
+ |-> phy device on the bus_id 1
+ .phy_reset = phy_reset;
+ |
+ |-> function to provide the phy_reset on this board
+ .phy_mask = 0,
+};
+
+static struct fixed_phy_status stmmac0_fixed_phy_status = {
+ .link = 1,
+ .speed = 100,
+ .duplex = 1,
+};
+
+During the board's device_init we can configure the first
+MAC for fixed_link by calling:
+ fixed_phy_add(PHY_POLL, 1, &stmmac0_fixed_phy_status));)
+and the second one, with a real PHY device attached to the bus,
+by using the stmmac_mdio_bus_data structure (to provide the id, the
+reset procedure etc).
+
+4.10) List of source files:
+ o Kconfig
+ o Makefile
+ o stmmac_main.c: main network device driver;
+ o stmmac_mdio.c: mdio functions;
+ o stmmac_ethtool.c: ethtool support;
+ o stmmac_timer.[ch]: timer code used for mitigating the driver dma interrupts
+ Only tested on ST40 platforms based.
+ o stmmac.h: private driver structure;
+ o common.h: common definitions and VFTs;
+ o descs.h: descriptor structure definitions;
+ o dwmac1000_core.c: GMAC core functions;
+ o dwmac1000_dma.c: dma functions for the GMAC chip;
+ o dwmac1000.h: specific header file for the GMAC;
+ o dwmac100_core: MAC 100 core and dma code;
+ o dwmac100_dma.c: dma funtions for the MAC chip;
+ o dwmac1000.h: specific header file for the MAC;
+ o dwmac_lib.c: generic DMA functions shared among chips
+ o enh_desc.c: functions for handling enhanced descriptors
+ o norm_desc.c: functions for handling normal descriptors
+
+5) TODO:
+ o XGMAC is not supported.
+ o Review the timer optimisation code to use an embedded device that will be
available in new chip generations.