diff options
Diffstat (limited to 'sys/arch/i386/isa/pccom.c')
| -rw-r--r-- | sys/arch/i386/isa/pccom.c | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/sys/arch/i386/isa/pccom.c b/sys/arch/i386/isa/pccom.c index 29e93ad3976..4bd40511805 100644 --- a/sys/arch/i386/isa/pccom.c +++ b/sys/arch/i386/isa/pccom.c @@ -1,4 +1,4 @@ -/* $OpenBSD: pccom.c,v 1.22 1998/02/23 11:40:32 downsj Exp $ */ +/* $OpenBSD: pccom.c,v 1.23 1998/04/05 07:36:42 downsj Exp $ */ /* $NetBSD: com.c,v 1.82.4.1 1996/06/02 09:08:00 mrg Exp $ */ /*- @@ -678,12 +678,34 @@ comattach(parent, self, aux) if (bus_space_read_1(iot, ioh, com_efr) == 0) { sc->sc_uarttype = COM_UART_ST16650; } else { - bus_space_write_1(iot, ioh, com_lcr, 0xbf); + bus_space_write_1(iot, ioh, com_lcr, 0xbf); /* magic */ if (bus_space_read_1(iot, ioh, com_efr) == 0) sc->sc_uarttype = COM_UART_ST16650V2; } } + if (sc->sc_uarttype == COM_UART_ST16650V2) { /* Probe for XR16850s */ + u_char dlbl, dlbh; + + /* Enable latch access and get the current values. */ + bus_space_write_1(iot, ioh, com_lcr, lcr | LCR_DLAB); + dlbl = bus_space_read_1(iot, ioh, com_dlbl); + dlbh = bus_space_read_1(iot, ioh, com_dlbh); + + /* Zero out the latch divisors */ + bus_space_write_1(iot, ioh, com_dlbl, 0); + bus_space_write_1(iot, ioh, com_dlbh, 0); + + if (bus_space_read_1(iot, ioh, com_dlbh) == 0x10) { + sc->sc_uarttype = COM_UART_XR16850; + sc->sc_uartrev = bus_space_read_1(iot, ioh, com_dlbl); + } + + /* Reset to original. */ + bus_space_write_1(iot, ioh, com_dlbl, dlbl); + bus_space_write_1(iot, ioh, com_dlbh, dlbh); + } + #ifdef notyet if (sc->sc_uarttype == COM_UART_16550A) { /* Probe for TI16750s */ bus_space_write_1(iot, ioh, com_lcr, lcr | LCR_DLAB); @@ -698,6 +720,7 @@ comattach(parent, self, aux) } #endif + /* Reset the LCR (latch access is probably enabled). */ bus_space_write_1(iot, ioh, com_lcr, lcr); if (sc->sc_uarttype == COM_UART_16450) { /* Probe for 8250 */ u_int8_t scr0, scr1, scr2; @@ -748,6 +771,11 @@ comattach(parent, self, aux) SET(sc->sc_hwflags, COM_HW_FIFO); sc->sc_fifolen = 64; break; + case COM_UART_XR16850: + printf(": xr16850 (rev %d), 128 byte fifo\n", sc->sc_uartrev); + SET(sc->sc_hwflags, COM_HW_FIFO); + sc->sc_fifolen = 128; + break; default: panic("comattach: bad fifo type\n"); } @@ -869,6 +897,7 @@ comopen(dev, flag, mode, p) switch (sc->sc_uarttype) { case COM_UART_ST16650: case COM_UART_ST16650V2: + case COM_UART_XR16850: bus_space_write_1(iot, ioh, com_lcr, 0xbf); bus_space_write_1(iot, ioh, com_efr, EFR_ECB); bus_space_write_1(iot, ioh, com_ier, 0); @@ -1061,6 +1090,7 @@ comclose(dev, flag, mode, p) switch (sc->sc_uarttype) { case COM_UART_ST16650: case COM_UART_ST16650V2: + case COM_UART_XR16850: bus_space_write_1(iot, ioh, com_lcr, 0xbf); bus_space_write_1(iot, ioh, com_efr, EFR_ECB); bus_space_write_1(iot, ioh, com_ier, IER_SLEEP); |