Stefan Reinauer | 8de452d | 2014-12-19 13:45:24 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Enable the serial devices on the VIA |
| 3 | */ |
| 4 | |
| 5 | |
| 6 | /* The base address is 0x15c, 0x2e, depending on config bytes */ |
| 7 | |
| 8 | #define SIO_BASE 0x3f0 |
| 9 | #define SIO_DATA SIO_BASE+1 |
| 10 | |
| 11 | static void vt8237r_writepnpaddr(uint8_t val) |
| 12 | { |
| 13 | outb(val, 0x2e); |
| 14 | outb(val, 0xeb); |
| 15 | } |
| 16 | |
| 17 | static void vt8237r_writepnpdata(uint8_t val) |
| 18 | { |
| 19 | outb(val, 0x2f); |
| 20 | outb(val, 0xeb); |
| 21 | } |
| 22 | |
| 23 | |
| 24 | static void vt8237r_writesiobyte(uint16_t reg, uint8_t val) |
| 25 | { |
| 26 | outb(val, reg); |
| 27 | } |
| 28 | |
| 29 | static void vt8237r_writesioword(uint16_t reg, uint16_t val) |
| 30 | { |
| 31 | outw(val, reg); |
| 32 | } |
| 33 | |
| 34 | |
| 35 | /* regs we use: 85, and the southbridge devfn is defined by the |
| 36 | mainboard |
| 37 | */ |
| 38 | |
| 39 | static void enable_vt8237r_serial(void) |
| 40 | { |
| 41 | // turn on pnp |
| 42 | vt8237r_writepnpaddr(0x87); |
| 43 | vt8237r_writepnpaddr(0x87); |
| 44 | // now go ahead and set up com1. |
| 45 | // set address |
| 46 | vt8237r_writepnpaddr(0x7); |
| 47 | vt8237r_writepnpdata(0x2); |
| 48 | // enable serial out |
| 49 | vt8237r_writepnpaddr(0x30); |
| 50 | vt8237r_writepnpdata(0x1); |
| 51 | // serial port 1 base address (FEh) |
| 52 | vt8237r_writepnpaddr(0x60); |
| 53 | vt8237r_writepnpdata(0xfe); |
| 54 | // serial port 1 IRQ (04h) |
| 55 | vt8237r_writepnpaddr(0x70); |
| 56 | vt8237r_writepnpdata(0x4); |
| 57 | // serial port 1 control |
| 58 | vt8237r_writepnpaddr(0xf0); |
| 59 | vt8237r_writepnpdata(0x2); |
| 60 | // turn of pnp |
| 61 | vt8237r_writepnpaddr(0xaa); |
| 62 | |
| 63 | // set up reg to set baud rate. |
| 64 | vt8237r_writesiobyte(0x3fb, 0x80); |
| 65 | // Set 115 kb |
| 66 | vt8237r_writesioword(0x3f8, 1); |
| 67 | // Set 9.6 kb |
| 68 | // WRITESIOWORD(0x3f8, 12) |
| 69 | // now set no parity, one stop, 8 bits |
| 70 | vt8237r_writesiobyte(0x3fb, 3); |
| 71 | // now turn on RTS, DRT |
| 72 | vt8237r_writesiobyte(0x3fc, 3); |
| 73 | // Enable interrupts |
| 74 | vt8237r_writesiobyte(0x3f9, 0xf); |
| 75 | // should be done. Dump a char for fun. |
| 76 | vt8237r_writesiobyte(0x3f8, 48); |
| 77 | } |