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Rewrite the miiphybb (Bit-banged MII bus driver) in order to support an arbitrary number of mii buses.

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This feature is useful when your board uses different mii buses for different
phys and all (or a part) of these buses are implemented via bit-banging mode.

The driver requires that the following macros should be defined into the board
configuration file:

CONFIG_BITBANGMII       - Enable the miiphybb driver
CONFIG_BITBANGMII_MULTI - Enable the multi bus support

If the CONFIG_BITBANGMII_MULTI is not defined, the board's config file needs
to define at least the following macros:

MII_INIT      - Generic code to enable the MII bus (optional)
MDIO_DECLARE  - Declaration needed to access to the MDIO pin (optional)
MDIO_ACTIVE   - Activate the MDIO pin as out pin
MDIO_TRISTATE - Activate the MDIO pin as input/tristate pin
MDIO_READ     - Read the MDIO pin
MDIO(v)       - Write v on the MDIO pin
MDC_DECLARE   - Declaration needed to access to the MDC pin (optional)
MDC(v)        - Write v on the MDC pin

The previous macros make the driver compatible with the previous version
(that didn't support the multi-bus).

When the CONFIG_BITBANGMII_MULTI is also defined, the board code needs to fill
the bb_miiphy_buses[] array with a record for each required bus and declare
the bb_miiphy_buses_num variable with the number of mii buses.
The record (struct bb_miiphy_bus) has the following fields/callbacks (see
miiphy.h for details):

char name[]            - The symbolic name that must be equal to the MII bus
                         registered name
int (*init)()          - Initialization function called at startup time (just
                         before the Ethernet initialization)
int (*mdio_active)()   - Activate the MDIO pin as output
int (*mdio_tristate)() - Activate the MDIO pin as input/tristate pin
int (*set_mdio)()      - Write the MDIO pin
int (*get_mdio)()      - Read the MDIO pin
int (*set_mdc)()       - Write the MDC pin
int (*delay)()         - Delay function
void *priv             - Private data used by board specific code

The board code will look like:

struct bb_miiphy_bus bb_miiphy_buses[] = {
 { .name = miibus#1, .init = b1_init, .mdio_active = b1_mdio_active, ... },
 { .name = miibus#2, .init = b2_init, .mdio_active = b2_mdio_active, ... },
 ...
int bb_miiphy_buses_num = sizeof(bb_miiphy_buses) /
                          sizeof(bb_miiphy_buses[0]);

Signed-off-by: Luigi 'Comio' Mantellini <luigi.mantellini@idf-hit.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
master
Luigi 'Comio' Mantellini 15 years ago committed by Ben Warren
parent cd77dd109c
commit 4ba31ab33a
3 changed files with 322 additions and 105 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 56
      doc/README.bitbangMII
  2. 346
      drivers/net/phy/miiphybb.c
  3. 25
      include/miiphy.h

56
doc/README.bitbangMII
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@ -0,0 +1,56 @@
This patch rewrites the miiphybb ( Bit-banged MII bus driver ) in order to
support an arbitrary number of mii buses. This feature is useful when your
board uses different mii buses for different phys and all (or a part) of these
buses are implemented via bit-banging mode.
The driver requires that the following macros should be defined into the board
configuration file:
CONFIG_BITBANGMII - Enable the miiphybb driver
CONFIG_BITBANGMII_MULTI - Enable the multi bus support
If the CONFIG_BITBANGMII_MULTI is not defined, the board's config file needs
to define at least the following macros:
MII_INIT - Generic code to enable the MII bus (optional)
MDIO_DECLARE - Declaration needed to access to the MDIO pin (optional)
MDIO_ACTIVE - Activate the MDIO pin as out pin
MDIO_TRISTATE - Activate the MDIO pin as input/tristate pin
MDIO_READ - Read the MDIO pin
MDIO(v) - Write v on the MDIO pin
MDC_DECLARE - Declaration needed to access to the MDC pin (optional)
MDC(v) - Write v on the MDC pin
The previous macros make the driver compatible with the previous version
(that didn't support the multi-bus).
When the CONFIG_BITBANGMII_MULTI is also defined, the board code needs to fill
the bb_miiphy_buses[] array with a record for each required bus and declare
the bb_miiphy_buses_num variable with the number of mii buses.
The record (struct bb_miiphy_bus) has the following fields/callbacks (see
miiphy.h for details):
char name[] - The symbolic name that must be equal to the MII bus
registered name
int (*init)() - Initialization function called at startup time (just
before the Ethernet initialization)
int (*mdio_active)() - Activate the MDIO pin as output
int (*mdio_tristate)() - Activate the MDIO pin as input/tristate pin
int (*set_mdio)() - Write the MDIO pin
int (*get_mdio)() - Read the MDIO pin
int (*set_mdc)() - Write the MDC pin
int (*delay)() - Delay function
void *priv - Private data used by board specific code
The board code will look like:
struct bb_miiphy_bus bb_miiphy_buses[] = {
{ .name = "miibus#1", .init = b1_init, .mdio_active = b1_mdio_active, ... },
{ .name = "miibus#2", .init = b2_init, .mdio_active = b2_mdio_active, ... },
...
};
int bb_miiphy_buses_num = sizeof(bb_miiphy_buses) /
sizeof(bb_miiphy_buses[0]);
2009 Industrie Dial Face S.p.A.
Luigi 'Comio' Mantellini <luigi.mantellini@idf-hit.com>

346
drivers/net/phy/miiphybb.c
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@ -1,4 +1,7 @@
/*
* (C) Copyright 2009 Industrie Dial Face S.p.A.
* Luigi 'Comio' Mantellini <luigi.mantellini@idf-hit.com>
*
* (C) Copyright 2001
* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
*
@ -29,18 +32,144 @@
#include <common.h>
#include <ioports.h>
#include <ppc_asm.tmpl>
#include <miiphy.h>
#define BB_MII_RELOCATE(v,off) (v += (v?off:0))
DECLARE_GLOBAL_DATA_PTR;
#ifndef CONFIG_BITBANGMII_MULTI
/*
* If CONFIG_BITBANGMII_MULTI is not defined we use a
* compatibility layer with the previous miiphybb implementation
* based on macros usage.
*
*/
static int bb_mii_init_wrap(struct bb_miiphy_bus *bus)
{
#ifdef MII_INIT
MII_INIT;
#endif
return 0;
}
static int bb_mdio_active_wrap(struct bb_miiphy_bus *bus)
{
#ifdef MDIO_DECLARE
MDIO_DECLARE;
#endif
MDIO_ACTIVE;
return 0;
}
static int bb_mdio_tristate_wrap(struct bb_miiphy_bus *bus)
{
#ifdef MDIO_DECLARE
MDIO_DECLARE;
#endif
MDIO_TRISTATE;
return 0;
}
static int bb_set_mdio_wrap(struct bb_miiphy_bus *bus, int v)
{
#ifdef MDIO_DECLARE
MDIO_DECLARE;
#endif
MDIO(v);
return 0;
}
static int bb_get_mdio_wrap(struct bb_miiphy_bus *bus, int *v)
{
#ifdef MDIO_DECLARE
MDIO_DECLARE;
#endif
*v = MDIO_READ;
return 0;
}
static int bb_set_mdc_wrap(struct bb_miiphy_bus *bus, int v)
{
#ifdef MDC_DECLARE
MDC_DECLARE;
#endif
MDC(v);
return 0;
}
static int bb_delay_wrap(struct bb_miiphy_bus *bus)
{
MIIDELAY;
return 0;
}
struct bb_miiphy_bus bb_miiphy_buses[] = {
{
.name = BB_MII_DEVNAME,
.init = bb_mii_init_wrap,
.mdio_active = bb_mdio_active_wrap,
.mdio_tristate = bb_mdio_tristate_wrap,
.set_mdio = bb_set_mdio_wrap,
.get_mdio = bb_get_mdio_wrap,
.set_mdc = bb_set_mdc_wrap,
.delay = bb_delay_wrap,
}
};
int bb_miiphy_buses_num = sizeof(bb_miiphy_buses) /
sizeof(bb_miiphy_buses[0]);
#endif
void bb_miiphy_init(void)
{
int i;
for (i = 0; i < bb_miiphy_buses_num; i++) {
#if !defined(CONFIG_RELOC_FIXUP_WORKS)
/* Relocate the hook pointers*/
BB_MII_RELOCATE(bb_miiphy_buses[i].init, gd->reloc_off);
BB_MII_RELOCATE(bb_miiphy_buses[i].mdio_active, gd->reloc_off);
BB_MII_RELOCATE(bb_miiphy_buses[i].mdio_tristate, gd->reloc_off);
BB_MII_RELOCATE(bb_miiphy_buses[i].set_mdio, gd->reloc_off);
BB_MII_RELOCATE(bb_miiphy_buses[i].get_mdio, gd->reloc_off);
BB_MII_RELOCATE(bb_miiphy_buses[i].set_mdc, gd->reloc_off);
BB_MII_RELOCATE(bb_miiphy_buses[i].delay, gd->reloc_off);
#endif
if (bb_miiphy_buses[i].init != NULL) {
bb_miiphy_buses[i].init(&bb_miiphy_buses[i]);
}
}
}
static inline struct bb_miiphy_bus *bb_miiphy_getbus(char *devname)
{
#ifdef CONFIG_BITBANGMII_MULTI
int i;
/* Search the correct bus */
for (i = 0; i < bb_miiphy_buses_num; i++) {
if (!strcmp(bb_miiphy_buses[i].name, devname)) {
return &bb_miiphy_buses[i];
}
}
return NULL;
#else
/* We have just one bitbanging bus */
return &bb_miiphy_buses[0];
#endif
}
/*****************************************************************************
*
* Utility to send the preamble, address, and register (common to read
* and write).
*/
static void miiphy_pre (char read, unsigned char addr, unsigned char reg)
static void miiphy_pre(struct bb_miiphy_bus *bus, char read,
unsigned char addr, unsigned char reg)
{
int j; /* counter */
#if !(defined(CONFIG_EP8248) || defined(CONFIG_EP82XXM))
volatile ioport_t *iop = ioport_addr ((immap_t *) CONFIG_SYS_IMMR, MDIO_PORT);
#endif
int j;
/*
* Send a 32 bit preamble ('1's) with an extra '1' bit for good measure.
@ -50,67 +179,66 @@ static void miiphy_pre (char read, unsigned char addr, unsigned char reg)
* but it is safer and will be much more robust.
*/
MDIO_ACTIVE;
MDIO (1);
bus->mdio_active(bus);
bus->set_mdio(bus, 1);
for (j = 0; j < 32; j++) {
MDC (0);
MIIDELAY;
MDC (1);
MIIDELAY;
bus->set_mdc(bus, 0);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
}
/* send the start bit (01) and the read opcode (10) or write (10) */
MDC (0);
MDIO (0);
MIIDELAY;
MDC (1);
MIIDELAY;
MDC (0);
MDIO (1);
MIIDELAY;
MDC (1);
MIIDELAY;
MDC (0);
MDIO (read);
MIIDELAY;
MDC (1);
MIIDELAY;
MDC (0);
MDIO (!read);
MIIDELAY;
MDC (1);
MIIDELAY;
bus->set_mdc(bus, 0);
bus->set_mdio(bus, 0);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
bus->set_mdc(bus, 0);
bus->set_mdio(bus, 1);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
bus->set_mdc(bus, 0);
bus->set_mdio(bus, read);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
bus->set_mdc(bus, 0);
bus->set_mdio(bus, !read);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
/* send the PHY address */
for (j = 0; j < 5; j++) {
MDC (0);
bus->set_mdc(bus, 0);
if ((addr & 0x10) == 0) {
MDIO (0);
bus->set_mdio(bus, 0);
} else {
MDIO (1);
bus->set_mdio(bus, 1);
}
MIIDELAY;
MDC (1);
MIIDELAY;
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
addr <<= 1;
}
/* send the register address */
for (j = 0; j < 5; j++) {
MDC (0);
bus->set_mdc(bus, 0);
if ((reg & 0x10) == 0) {
MDIO (0);
bus->set_mdio(bus, 0);
} else {
MDIO (1);
bus->set_mdio(bus, 1);
}
MIIDELAY;
MDC (1);
MIIDELAY;
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
reg <<= 1;
}
}
/*****************************************************************************
*
* Read a MII PHY register.
@ -118,63 +246,69 @@ static void miiphy_pre (char read, unsigned char addr, unsigned char reg)
* Returns:
* 0 on success
*/
int bb_miiphy_read (char *devname, unsigned char addr,
unsigned char reg, unsigned short *value)
int bb_miiphy_read(char *devname, unsigned char addr,
unsigned char reg, unsigned short *value)
{
short rdreg; /* register working value */
int j; /* counter */
#if !(defined(CONFIG_EP8248) || defined(CONFIG_EP82XXM))
volatile ioport_t *iop = ioport_addr ((immap_t *) CONFIG_SYS_IMMR, MDIO_PORT);
#endif
short rdreg; /* register working value */
int v;
int j; /* counter */
struct bb_miiphy_bus *bus;
bus = bb_miiphy_getbus(devname);
if (bus == NULL) {
return -1;
}
if (value == NULL) {
puts("NULL value pointer\n");
return (-1);
return -1;
}
miiphy_pre (1, addr, reg);
miiphy_pre (bus, 1, addr, reg);
/* tri-state our MDIO I/O pin so we can read */
MDC (0);
MDIO_TRISTATE;
MIIDELAY;
MDC (1);
MIIDELAY;
bus->set_mdc(bus, 0);
bus->mdio_tristate(bus);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
/* check the turnaround bit: the PHY should be driving it to zero */
if (MDIO_READ != 0) {
bus->get_mdio(bus, &v);
if (v != 0) {
/* puts ("PHY didn't drive TA low\n"); */
for (j = 0; j < 32; j++) {
MDC (0);
MIIDELAY;
MDC (1);
MIIDELAY;
bus->set_mdc(bus, 0);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
}
/* There is no PHY, set value to 0xFFFF and return */
*value = 0xFFFF;
return (-1);
return -1;
}
MDC (0);
MIIDELAY;
bus->set_mdc(bus, 0);
bus->delay(bus);
/* read 16 bits of register data, MSB first */
rdreg = 0;
for (j = 0; j < 16; j++) {
MDC (1);
MIIDELAY;
bus->set_mdc(bus, 1);
bus->delay(bus);
rdreg <<= 1;
rdreg |= MDIO_READ;
MDC (0);
MIIDELAY;
bus->get_mdio(bus, &v);
rdreg |= (v & 0x1);
bus->set_mdc(bus, 0);
bus->delay(bus);
}
MDC (1);
MIIDELAY;
MDC (0);
MIIDELAY;
MDC (1);
MIIDELAY;
bus->set_mdc(bus, 1);
bus->delay(bus);
bus->set_mdc(bus, 0);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
*value = rdreg;
@ -194,49 +328,53 @@ int bb_miiphy_read (char *devname, unsigned char addr,
* 0 on success
*/
int bb_miiphy_write (char *devname, unsigned char addr,
unsigned char reg, unsigned short value)
unsigned char reg, unsigned short value)
{
struct bb_miiphy_bus *bus;
int j; /* counter */
#if !(defined(CONFIG_EP8248) || defined(CONFIG_EP82XXM))
volatile ioport_t *iop = ioport_addr ((immap_t *) CONFIG_SYS_IMMR, MDIO_PORT);
#endif
miiphy_pre (0, addr, reg);
bus = bb_miiphy_getbus(devname);
if (bus == NULL) {
/* Bus not found! */
return -1;
}
miiphy_pre (bus, 0, addr, reg);
/* send the turnaround (10) */
MDC (0);
MDIO (1);
MIIDELAY;
MDC (1);
MIIDELAY;
MDC (0);
MDIO (0);
MIIDELAY;
MDC (1);
MIIDELAY;
bus->set_mdc(bus, 0);
bus->set_mdio(bus, 1);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
bus->set_mdc(bus, 0);
bus->set_mdio(bus, 0);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
/* write 16 bits of register data, MSB first */
for (j = 0; j < 16; j++) {
MDC (0);
bus->set_mdc(bus, 0);
if ((value & 0x00008000) == 0) {
MDIO (0);
bus->set_mdio(bus, 0);
} else {
MDIO (1);
bus->set_mdio(bus, 1);
}
MIIDELAY;
MDC (1);
MIIDELAY;
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
value <<= 1;
}
/*
* Tri-state the MDIO line.
*/
MDIO_TRISTATE;
MDC (0);
MIIDELAY;
MDC (1);
MIIDELAY;
bus->mdio_tristate(bus);
bus->set_mdc(bus, 0);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
return 0;
}
}

25
include/miiphy.h
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@ -19,6 +19,8 @@
|
| COPYRIGHT I B M CORPORATION 1999
| LICENSED MATERIAL - PROGRAM PROPERTY OF I B M
|
| Additions (C) Copyright 2009 Industrie Dial Face S.p.A.
+----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------+
|
@ -61,12 +63,33 @@ char *miiphy_get_current_dev (void);
void miiphy_listdev (void);
#define BB_MII_DEVNAME "bbmii"
#ifdef CONFIG_BITBANGMII
#define BB_MII_DEVNAME "bb_miiphy"
struct bb_miiphy_bus {
char name[NAMESIZE];
int (*init)(struct bb_miiphy_bus *bus);
int (*mdio_active)(struct bb_miiphy_bus *bus);
int (*mdio_tristate)(struct bb_miiphy_bus *bus);
int (*set_mdio)(struct bb_miiphy_bus *bus, int v);
int (*get_mdio)(struct bb_miiphy_bus *bus, int *v);
int (*set_mdc)(struct bb_miiphy_bus *bus, int v);
int (*delay)(struct bb_miiphy_bus *bus);
#ifdef CONFIG_BITBANGMII_MULTI
void *priv;
#endif
};
extern struct bb_miiphy_bus bb_miiphy_buses[];
extern int bb_miiphy_buses_num;
void bb_miiphy_init (void);
int bb_miiphy_read (char *devname, unsigned char addr,
unsigned char reg, unsigned short *value);
int bb_miiphy_write (char *devname, unsigned char addr,
unsigned char reg, unsigned short value);
#endif
/* phy seed setup */
#define AUTO 99

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