diff options
Diffstat (limited to 'sys/dev/ic/smc93cx6.c')
| -rw-r--r-- | sys/dev/ic/smc93cx6.c | 102 |
1 files changed, 43 insertions, 59 deletions
diff --git a/sys/dev/ic/smc93cx6.c b/sys/dev/ic/smc93cx6.c index 5f048f79ad7..026eb0c5b0d 100644 --- a/sys/dev/ic/smc93cx6.c +++ b/sys/dev/ic/smc93cx6.c @@ -1,5 +1,6 @@ -/* $OpenBSD: smc93cx6.c,v 1.16 2003/08/15 23:41:47 fgsch Exp $ */ -/* $FreeBSD: sys/dev/aic7xxx/93cx6.c,v 1.5 2000/01/07 23:08:17 gibbs Exp $ */ +/* $OpenBSD: smc93cx6.c,v 1.17 2003/09/25 06:43:34 fgsch Exp $ */ +/* $NetBSD: smc93cx6.c,v 1.10 2003/05/02 19:12:19 dyoung Exp $ */ + /* * Interface for the 93C66/56/46/26/06 serial eeprom parts. * @@ -19,6 +20,8 @@ * Daniel M. Eischen. * 4. Modifications may be freely made to this file if the above conditions * are met. + * + * $FreeBSD: src/sys/dev/aic7xxx/93cx6.c,v 1.5 2000/01/07 23:08:17 gibbs Exp $ */ /* @@ -66,60 +69,23 @@ */ static struct seeprom_cmd { unsigned char len; - unsigned char bits[9]; + unsigned char bits[3]; } seeprom_read = {3, {1, 1, 0}}; -/* - * Wait for the SEERDY to go high; about 800 ns. - */ -#define CLOCK_PULSE(sd, rdy) \ - while ((SEEPROM_STATUS_INB(sd) & rdy) == 0) { \ - ; /* Do nothing */ \ - } \ - (void)SEEPROM_INB(sd); /* Clear clock */ - -/* - * Send a START condition and the given command - */ -static void -send_seeprom_cmd(struct seeprom_descriptor *sd, struct seeprom_cmd *cmd) -{ - u_int8_t temp; - int i = 0; - - /* Send chip select for one clock cycle. */ - temp = sd->sd_MS ^ sd->sd_CS; - SEEPROM_OUTB(sd, temp ^ sd->sd_CK); - CLOCK_PULSE(sd, sd->sd_RDY); - - for (i = 0; i < cmd->len; i++) { - if (cmd->bits[i] != 0) - temp ^= sd->sd_DO; - SEEPROM_OUTB(sd, temp); - CLOCK_PULSE(sd, sd->sd_RDY); - SEEPROM_OUTB(sd, temp ^ sd->sd_CK); - CLOCK_PULSE(sd, sd->sd_RDY); - if (cmd->bits[i] != 0) - temp ^= sd->sd_DO; - } -} - -/* - * Clear CS put the chip in the reset state, where it can wait for new commands. - */ -static void -reset_seeprom(struct seeprom_descriptor *sd) -{ - u_int8_t temp; - - temp = sd->sd_MS; - SEEPROM_OUTB(sd, temp); - CLOCK_PULSE(sd, sd->sd_RDY); - SEEPROM_OUTB(sd, temp ^ sd->sd_CK); - CLOCK_PULSE(sd, sd->sd_RDY); - SEEPROM_OUTB(sd, temp); - CLOCK_PULSE(sd, sd->sd_RDY); -} +#define CLOCK_PULSE(sd, rdy) do { \ + /* \ + * Wait for the SEERDY to go high; about 800 ns. \ + */ \ + int cpi = 1000; \ + if (rdy == 0) { \ + DELAY(4); /* more than long enough */ \ + break; \ + } \ + while ((SEEPROM_STATUS_INB(sd) & rdy) == 0 && cpi-- > 0) { \ + ; /* Do nothing */ \ + } \ + (void)SEEPROM_INB(sd); /* Clear clock */ \ +} while (0) /* * Read the serial EEPROM and returns 1 if successful and 0 if @@ -135,21 +101,33 @@ read_seeprom(sd, buf, start_addr, count) int i = 0; u_int k = 0; u_int16_t v; - u_int8_t temp; + u_int32_t temp; /* * Read the requested registers of the seeprom. The loop * will range from 0 to count-1. */ for (k = start_addr; k < count + start_addr; k++) { + /* Send chip select for one clock cycle. */ + temp = sd->sd_MS ^ sd->sd_CS; + SEEPROM_OUTB(sd, temp ^ sd->sd_CK); + CLOCK_PULSE(sd, sd->sd_RDY); + /* * Now we're ready to send the read command followed by the * address of the 16-bit register we want to read. */ - send_seeprom_cmd(sd, &seeprom_read); - + for (i = 0; i < seeprom_read.len; i++) { + if (seeprom_read.bits[i] != 0) + temp ^= sd->sd_DO; + SEEPROM_OUTB(sd, temp); + CLOCK_PULSE(sd, sd->sd_RDY); + SEEPROM_OUTB(sd, temp ^ sd->sd_CK); + CLOCK_PULSE(sd, sd->sd_RDY); + if (seeprom_read.bits[i] != 0) + temp ^= sd->sd_DO; + } /* Send the 6 or 8 bit address (MSB first, LSB last). */ - temp = sd->sd_MS ^ sd->sd_CS; for (i = (sd->sd_chip - 1); i >= 0; i--) { if ((k & (1 << i)) != 0) temp ^= sd->sd_DO; @@ -181,7 +159,13 @@ read_seeprom(sd, buf, start_addr, count) buf[k - start_addr] = v; /* Reset the chip select for the next command cycle. */ - reset_seeprom(sd); + temp = sd->sd_MS; + SEEPROM_OUTB(sd, temp); + CLOCK_PULSE(sd, sd->sd_RDY); + SEEPROM_OUTB(sd, temp ^ sd->sd_CK); + CLOCK_PULSE(sd, sd->sd_RDY); + SEEPROM_OUTB(sd, temp); + CLOCK_PULSE(sd, sd->sd_RDY); } #ifdef AHC_DUMP_EEPROM printf("\nSerial EEPROM:\n\t"); |