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-rw-r--r--common/miiphybb.c328
1 files changed, 168 insertions, 160 deletions
diff --git a/common/miiphybb.c b/common/miiphybb.c
index b4cbb70..b6af88f 100644
--- a/common/miiphybb.c
+++ b/common/miiphybb.c
@@ -38,72 +38,79 @@
* 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 (char read, unsigned char addr, unsigned char reg)
{
- int j; /* counter */
- volatile ioport_t *iop = ioport_addr((immap_t *)CFG_IMMR, MDIO_PORT);
-
- /*
- * Send a 32 bit preamble ('1's) with an extra '1' bit for good measure.
- * The IEEE spec says this is a PHY optional requirement. The AMD
- * 79C874 requires one after power up and one after a MII communications
- * error. This means that we are doing more preambles than we need,
- * but it is safer and will be much more robust.
- */
-
- MDIO_ACTIVE;
- MDIO(1);
- for(j = 0; j < 32; j++)
- {
- MDC(0);
- MIIDELAY;
- MDC(1);
- MIIDELAY;
- }
-
- /* 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;
-
- /* send the PHY address */
- for(j = 0; j < 5; j++)
- {
- MDC(0);
- if((addr & 0x10) == 0)
- {
- MDIO(0);
- }
- else
- {
- MDIO(1);
- }
- MIIDELAY;
- MDC(1);
- MIIDELAY;
- addr <<= 1;
- }
-
- /* send the register address */
- for(j = 0; j < 5; j++)
- {
- MDC(0);
- if((reg & 0x10) == 0)
- {
- MDIO(0);
- }
- else
- {
- MDIO(1);
- }
- MIIDELAY;
- MDC(1);
- MIIDELAY;
- reg <<= 1;
- }
+ int j; /* counter */
+#ifndef CONFIG_EP8248
+ volatile ioport_t *iop = ioport_addr ((immap_t *) CFG_IMMR, MDIO_PORT);
+#endif
+
+ /*
+ * Send a 32 bit preamble ('1's) with an extra '1' bit for good measure.
+ * The IEEE spec says this is a PHY optional requirement. The AMD
+ * 79C874 requires one after power up and one after a MII communications
+ * error. This means that we are doing more preambles than we need,
+ * but it is safer and will be much more robust.
+ */
+
+ MDIO_ACTIVE;
+ MDIO (1);
+ for (j = 0; j < 32; j++) {
+ MDC (0);
+ MIIDELAY;
+ MDC (1);
+ MIIDELAY;
+ }
+
+ /* 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;
+
+ /* send the PHY address */
+ for (j = 0; j < 5; j++) {
+ MDC (0);
+ if ((addr & 0x10) == 0) {
+ MDIO (0);
+ } else {
+ MDIO (1);
+ }
+ MIIDELAY;
+ MDC (1);
+ MIIDELAY;
+ addr <<= 1;
+ }
+
+ /* send the register address */
+ for (j = 0; j < 5; j++) {
+ MDC (0);
+ if ((reg & 0x10) == 0) {
+ MDIO (0);
+ } else {
+ MDIO (1);
+ }
+ MIIDELAY;
+ MDC (1);
+ MIIDELAY;
+ reg <<= 1;
+ }
}
@@ -114,66 +121,63 @@ static void miiphy_pre(char read,
* Returns:
* 0 on success
*/
-int miiphy_read(unsigned char addr,
- unsigned char reg,
- unsigned short *value)
+int miiphy_read (unsigned char addr, unsigned char reg, unsigned short *value)
{
- short rdreg; /* register working value */
- int j; /* counter */
- volatile ioport_t *iop = ioport_addr((immap_t *)CFG_IMMR, MDIO_PORT);
-
- miiphy_pre(1, addr, reg);
-
- /* tri-state our MDIO I/O pin so we can read */
- MDC(0);
- MDIO_TRISTATE;
- MIIDELAY;
- MDC(1);
- MIIDELAY;
-
- /* check the turnaround bit: the PHY should be driving it to zero */
- if(MDIO_READ != 0)
- {
- /* puts ("PHY didn't drive TA low\n"); */
- for(j = 0; j < 32; j++)
- {
- MDC(0);
- MIIDELAY;
- MDC(1);
- MIIDELAY;
- }
- return(-1);
- }
-
- MDC(0);
- MIIDELAY;
-
- /* read 16 bits of register data, MSB first */
- rdreg = 0;
- for(j = 0; j < 16; j++)
- {
- MDC(1);
- MIIDELAY;
- rdreg <<= 1;
- rdreg |= MDIO_READ;
- MDC(0);
- MIIDELAY;
- }
-
- MDC(1);
- MIIDELAY;
- MDC(0);
- MIIDELAY;
- MDC(1);
- MIIDELAY;
-
- *value = rdreg;
+ short rdreg; /* register working value */
+ int j; /* counter */
+#ifndef CONFIG_EP8248
+ volatile ioport_t *iop = ioport_addr ((immap_t *) CFG_IMMR, MDIO_PORT);
+#endif
+
+ miiphy_pre (1, addr, reg);
+
+ /* tri-state our MDIO I/O pin so we can read */
+ MDC (0);
+ MDIO_TRISTATE;
+ MIIDELAY;
+ MDC (1);
+ MIIDELAY;
+
+ /* check the turnaround bit: the PHY should be driving it to zero */
+ if (MDIO_READ != 0) {
+ /* puts ("PHY didn't drive TA low\n"); */
+ for (j = 0; j < 32; j++) {
+ MDC (0);
+ MIIDELAY;
+ MDC (1);
+ MIIDELAY;
+ }
+ return (-1);
+ }
+
+ MDC (0);
+ MIIDELAY;
+
+ /* read 16 bits of register data, MSB first */
+ rdreg = 0;
+ for (j = 0; j < 16; j++) {
+ MDC (1);
+ MIIDELAY;
+ rdreg <<= 1;
+ rdreg |= MDIO_READ;
+ MDC (0);
+ MIIDELAY;
+ }
+
+ MDC (1);
+ MIIDELAY;
+ MDC (0);
+ MIIDELAY;
+ MDC (1);
+ MIIDELAY;
+
+ *value = rdreg;
#ifdef DEBUG
- printf ("miiphy_read(0x%x) @ 0x%x = 0x%04x\n", reg, addr, *value);
+ printf ("miiphy_read(0x%x) @ 0x%x = 0x%04x\n", reg, addr, *value);
#endif
- return 0;
+ return 0;
}
@@ -184,47 +188,51 @@ int miiphy_read(unsigned char addr,
* Returns:
* 0 on success
*/
-int miiphy_write(unsigned char addr,
- unsigned char reg,
- unsigned short value)
+int miiphy_write (unsigned char addr, unsigned char reg, unsigned short value)
{
- int j; /* counter */
- volatile ioport_t *iop = ioport_addr((immap_t *)CFG_IMMR, MDIO_PORT);
-
- miiphy_pre(0, addr, reg);
-
- /* send the turnaround (10) */
- MDC(0); MDIO(1); MIIDELAY; MDC(1); MIIDELAY;
- MDC(0); MDIO(0); MIIDELAY; MDC(1); MIIDELAY;
-
- /* write 16 bits of register data, MSB first */
- for(j = 0; j < 16; j++)
- {
- MDC(0);
- if((value & 0x00008000) == 0)
- {
- MDIO(0);
- }
- else
- {
- MDIO(1);
- }
- MIIDELAY;
- MDC(1);
- MIIDELAY;
- value <<= 1;
- }
-
- /*
- * Tri-state the MDIO line.
- */
- MDIO_TRISTATE;
- MDC(0);
- MIIDELAY;
- MDC(1);
- MIIDELAY;
-
- return 0;
+ int j; /* counter */
+#ifndef CONFIG_EP8248
+ volatile ioport_t *iop = ioport_addr ((immap_t *) CFG_IMMR, MDIO_PORT);
+#endif
+
+ miiphy_pre (0, addr, reg);
+
+ /* send the turnaround (10) */
+ MDC (0);
+ MDIO (1);
+ MIIDELAY;
+ MDC (1);
+ MIIDELAY;
+ MDC (0);
+ MDIO (0);
+ MIIDELAY;
+ MDC (1);
+ MIIDELAY;
+
+ /* write 16 bits of register data, MSB first */
+ for (j = 0; j < 16; j++) {
+ MDC (0);
+ if ((value & 0x00008000) == 0) {
+ MDIO (0);
+ } else {
+ MDIO (1);
+ }
+ MIIDELAY;
+ MDC (1);
+ MIIDELAY;
+ value <<= 1;
+ }
+
+ /*
+ * Tri-state the MDIO line.
+ */
+ MDIO_TRISTATE;
+ MDC (0);
+ MIIDELAY;
+ MDC (1);
+ MIIDELAY;
+
+ return 0;
}
#endif /* CONFIG_BITBANGMII */
generated by cgit v1.1 at 2024-11-24 08:34:21 +0000