diff options
Diffstat (limited to 'qemu/roms/seabios/src/hw/ps2port.c')
| -rw-r--r-- | qemu/roms/seabios/src/hw/ps2port.c | 507 |
1 files changed, 507 insertions, 0 deletions
diff --git a/qemu/roms/seabios/src/hw/ps2port.c b/qemu/roms/seabios/src/hw/ps2port.c new file mode 100644 index 000000000..04995c881 --- /dev/null +++ b/qemu/roms/seabios/src/hw/ps2port.c @@ -0,0 +1,507 @@ +// Support for handling the PS/2 mouse/keyboard ports. +// +// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net> +// Several ideas taken from code Copyright (c) 1999-2004 Vojtech Pavlik +// +// This file may be distributed under the terms of the GNU LGPLv3 license. + +#include "biosvar.h" // GET_LOW +#include "output.h" // dprintf +#include "pic.h" // pic_eoi1 +#include "ps2port.h" // ps2_kbd_command +#include "romfile.h" // romfile_loadint +#include "stacks.h" // yield +#include "util.h" // udelay +#include "x86.h" // inb + + +/**************************************************************** + * Low level i8042 commands. + ****************************************************************/ + +// Timeout value. +#define I8042_CTL_TIMEOUT 10000 + +#define I8042_BUFFER_SIZE 16 + +static int +i8042_wait_read(void) +{ + dprintf(7, "i8042_wait_read\n"); + int i; + for (i=0; i<I8042_CTL_TIMEOUT; i++) { + u8 status = inb(PORT_PS2_STATUS); + if (status & I8042_STR_OBF) + return 0; + udelay(50); + } + warn_timeout(); + return -1; +} + +static int +i8042_wait_write(void) +{ + dprintf(7, "i8042_wait_write\n"); + int i; + for (i=0; i<I8042_CTL_TIMEOUT; i++) { + u8 status = inb(PORT_PS2_STATUS); + if (! (status & I8042_STR_IBF)) + return 0; + udelay(50); + } + warn_timeout(); + return -1; +} + +static int +i8042_flush(void) +{ + dprintf(7, "i8042_flush\n"); + int i; + for (i=0; i<I8042_BUFFER_SIZE; i++) { + u8 status = inb(PORT_PS2_STATUS); + if (! (status & I8042_STR_OBF)) + return 0; + udelay(50); + u8 data = inb(PORT_PS2_DATA); + dprintf(7, "i8042 flushed %x (status=%x)\n", data, status); + } + + warn_timeout(); + return -1; +} + +static int +__i8042_command(int command, u8 *param) +{ + int receive = (command >> 8) & 0xf; + int send = (command >> 12) & 0xf; + + // Send the command. + int ret = i8042_wait_write(); + if (ret) + return ret; + outb(command, PORT_PS2_STATUS); + + // Send parameters (if any). + int i; + for (i = 0; i < send; i++) { + ret = i8042_wait_write(); + if (ret) + return ret; + outb(param[i], PORT_PS2_DATA); + } + + // Receive parameters (if any). + for (i = 0; i < receive; i++) { + ret = i8042_wait_read(); + if (ret) + return ret; + param[i] = inb(PORT_PS2_DATA); + dprintf(7, "i8042 param=%x\n", param[i]); + } + + return 0; +} + +static int +i8042_command(int command, u8 *param) +{ + dprintf(7, "i8042_command cmd=%x\n", command); + int ret = __i8042_command(command, param); + if (ret) + dprintf(2, "i8042 command %x failed\n", command); + return ret; +} + +static int +i8042_kbd_write(u8 c) +{ + dprintf(7, "i8042_kbd_write c=%d\n", c); + int ret = i8042_wait_write(); + if (! ret) + outb(c, PORT_PS2_DATA); + return ret; +} + +static int +i8042_aux_write(u8 c) +{ + return i8042_command(I8042_CMD_AUX_SEND, &c); +} + +void +i8042_reboot(void) +{ + if (! CONFIG_PS2PORT) + return; + int i; + for (i=0; i<10; i++) { + i8042_wait_write(); + udelay(50); + outb(0xfe, PORT_PS2_STATUS); /* pulse reset low */ + udelay(50); + } +} + + +/**************************************************************** + * Device commands. + ****************************************************************/ + +#define PS2_RET_ACK 0xfa +#define PS2_RET_NAK 0xfe + +static int +ps2_recvbyte(int aux, int needack, int timeout) +{ + u32 end = timer_calc(timeout); + for (;;) { + u8 status = inb(PORT_PS2_STATUS); + if (status & I8042_STR_OBF) { + u8 data = inb(PORT_PS2_DATA); + dprintf(7, "ps2 read %x\n", data); + + if (!!(status & I8042_STR_AUXDATA) == aux) { + if (!needack) + return data; + if (data == PS2_RET_ACK) + return data; + if (data == PS2_RET_NAK) { + dprintf(1, "Got ps2 nak (status=%x)\n", status); + return data; + } + } + + // This data not part of command - just discard it. + dprintf(1, "Discarding ps2 data %02x (status=%02x)\n", data, status); + } + + if (timer_check(end)) { + // Don't warn on second byte of a reset + if (timeout > 100) + warn_timeout(); + return -1; + } + yield(); + } +} + +static int +ps2_sendbyte(int aux, u8 command, int timeout) +{ + dprintf(7, "ps2_sendbyte aux=%d cmd=%x\n", aux, command); + int ret; + if (aux) + ret = i8042_aux_write(command); + else + ret = i8042_kbd_write(command); + if (ret) + return ret; + + // Read ack. + ret = ps2_recvbyte(aux, 1, timeout); + if (ret < 0) + return ret; + if (ret != PS2_RET_ACK) + return -1; + + return 0; +} + +u8 Ps2ctr VARLOW; + +static int +__ps2_command(int aux, int command, u8 *param) +{ + int ret2; + int receive = (command >> 8) & 0xf; + int send = (command >> 12) & 0xf; + + // Disable interrupts and keyboard/mouse. + u8 ps2ctr = GET_LOW(Ps2ctr); + u8 newctr = ((ps2ctr | I8042_CTR_AUXDIS | I8042_CTR_KBDDIS) + & ~(I8042_CTR_KBDINT|I8042_CTR_AUXINT)); + dprintf(6, "i8042 ctr old=%x new=%x\n", ps2ctr, newctr); + int ret = i8042_command(I8042_CMD_CTL_WCTR, &newctr); + if (ret) + return ret; + + // Flush any interrupts already pending. + yield(); + + // Enable port command is being sent to. + if (aux) + newctr &= ~I8042_CTR_AUXDIS; + else + newctr &= ~I8042_CTR_KBDDIS; + ret = i8042_command(I8042_CMD_CTL_WCTR, &newctr); + if (ret) + goto fail; + + if (command == ATKBD_CMD_RESET_BAT) { + // Reset is special wrt timeouts and bytes received. + + // Send command. + ret = ps2_sendbyte(aux, command, 1000); + if (ret) + goto fail; + + // Receive parameters. + ret = ps2_recvbyte(aux, 0, 4000); + if (ret < 0) + goto fail; + param[0] = ret; + ret = ps2_recvbyte(aux, 0, 100); + if (ret < 0) + // Some devices only respond with one byte on reset. + ret = 0; + param[1] = ret; + } else if (command == ATKBD_CMD_GETID) { + // Getid is special wrt bytes received. + + // Send command. + ret = ps2_sendbyte(aux, command, 200); + if (ret) + goto fail; + + // Receive parameters. + ret = ps2_recvbyte(aux, 0, 500); + if (ret < 0) + goto fail; + param[0] = ret; + if (ret == 0xab || ret == 0xac || ret == 0x2b || ret == 0x5d + || ret == 0x60 || ret == 0x47) { + // These ids (keyboards) return two bytes. + ret = ps2_recvbyte(aux, 0, 500); + if (ret < 0) + goto fail; + param[1] = ret; + } else { + param[1] = 0; + } + } else { + // Send command. + ret = ps2_sendbyte(aux, command, 200); + if (ret) + goto fail; + + // Send parameters (if any). + int i; + for (i = 0; i < send; i++) { + ret = ps2_sendbyte(aux, param[i], 200); + if (ret) + goto fail; + } + + // Receive parameters (if any). + for (i = 0; i < receive; i++) { + ret = ps2_recvbyte(aux, 0, 500); + if (ret < 0) + goto fail; + param[i] = ret; + } + } + + ret = 0; + +fail: + // Restore interrupts and keyboard/mouse. + ret2 = i8042_command(I8042_CMD_CTL_WCTR, &ps2ctr); + if (ret2) + return ret2; + + return ret; +} + +static int +ps2_command(int aux, int command, u8 *param) +{ + dprintf(7, "ps2_command aux=%d cmd=%x\n", aux, command); + int ret = __ps2_command(aux, command, param); + if (ret) + dprintf(2, "ps2 command %x failed (aux=%d)\n", command, aux); + return ret; +} + +int +ps2_kbd_command(int command, u8 *param) +{ + if (! CONFIG_PS2PORT) + return -1; + return ps2_command(0, command, param); +} + +int +ps2_mouse_command(int command, u8 *param) +{ + if (! CONFIG_PS2PORT) + return -1; + + // Update ps2ctr for mouse enable/disable. + if (command == PSMOUSE_CMD_ENABLE || command == PSMOUSE_CMD_DISABLE) { + u8 ps2ctr = GET_LOW(Ps2ctr); + if (command == PSMOUSE_CMD_ENABLE) + ps2ctr = (ps2ctr | I8042_CTR_AUXINT) & ~I8042_CTR_AUXDIS; + else + ps2ctr = (ps2ctr | I8042_CTR_AUXDIS) & ~I8042_CTR_AUXINT; + SET_LOW(Ps2ctr, ps2ctr); + } + + return ps2_command(1, command, param); +} + + +/**************************************************************** + * IRQ handlers + ****************************************************************/ + +// INT74h : PS/2 mouse hardware interrupt +void VISIBLE16 +handle_74(void) +{ + if (! CONFIG_PS2PORT) + return; + + debug_isr(DEBUG_ISR_74); + + u8 v = inb(PORT_PS2_STATUS); + if ((v & (I8042_STR_OBF|I8042_STR_AUXDATA)) + != (I8042_STR_OBF|I8042_STR_AUXDATA)) { + dprintf(1, "ps2 mouse irq but no mouse data.\n"); + goto done; + } + v = inb(PORT_PS2_DATA); + + if (!(GET_LOW(Ps2ctr) & I8042_CTR_AUXINT)) + // Interrupts not enabled. + goto done; + + process_mouse(v); + +done: + pic_eoi2(); +} + +// INT09h : Keyboard Hardware Service Entry Point +void VISIBLE16 +handle_09(void) +{ + if (! CONFIG_PS2PORT) + return; + + debug_isr(DEBUG_ISR_09); + + // read key from keyboard controller + u8 v = inb(PORT_PS2_STATUS); + if (v & I8042_STR_AUXDATA) { + dprintf(1, "ps2 keyboard irq but found mouse data?!\n"); + goto done; + } + v = inb(PORT_PS2_DATA); + + if (!(GET_LOW(Ps2ctr) & I8042_CTR_KBDINT)) + // Interrupts not enabled. + goto done; + + process_key(v); + + // Some old programs expect ISR to turn keyboard back on. + i8042_command(I8042_CMD_KBD_ENABLE, NULL); + +done: + pic_eoi1(); +} + + +/**************************************************************** + * Setup + ****************************************************************/ + +static void +ps2_keyboard_setup(void *data) +{ + /* flush incoming keys */ + int ret = i8042_flush(); + if (ret) + return; + + // Controller self-test. + u8 param[2]; + ret = i8042_command(I8042_CMD_CTL_TEST, param); + if (ret) + return; + if (param[0] != 0x55) { + dprintf(1, "i8042 self test failed (got %x not 0x55)\n", param[0]); + return; + } + + // Controller keyboard test. + ret = i8042_command(I8042_CMD_KBD_TEST, param); + if (ret) + return; + if (param[0] != 0x00) { + dprintf(1, "i8042 keyboard test failed (got %x not 0x00)\n", param[0]); + return; + } + + // Disable keyboard and mouse events. + SET_LOW(Ps2ctr, I8042_CTR_KBDDIS | I8042_CTR_AUXDIS); + + + /* ------------------- keyboard side ------------------------*/ + /* reset keyboard and self test (keyboard side) */ + int spinupdelay = romfile_loadint("etc/ps2-keyboard-spinup", 0); + u32 end = timer_calc(spinupdelay); + for (;;) { + ret = ps2_kbd_command(ATKBD_CMD_RESET_BAT, param); + if (!ret) + break; + if (timer_check(end)) { + if (spinupdelay) + warn_timeout(); + return; + } + yield(); + } + if (param[0] != 0xaa) { + dprintf(1, "keyboard self test failed (got %x not 0xaa)\n", param[0]); + return; + } + + /* Disable keyboard */ + ret = ps2_kbd_command(ATKBD_CMD_RESET_DIS, NULL); + if (ret) + return; + + // Set scancode command (mode 2) + param[0] = 0x02; + ret = ps2_kbd_command(ATKBD_CMD_SSCANSET, param); + if (ret) + return; + + // Keyboard Mode: disable mouse, scan code convert, enable kbd IRQ + SET_LOW(Ps2ctr, I8042_CTR_AUXDIS | I8042_CTR_XLATE | I8042_CTR_KBDINT); + + /* Enable keyboard */ + ret = ps2_kbd_command(ATKBD_CMD_ENABLE, NULL); + if (ret) + return; + + dprintf(1, "PS2 keyboard initialized\n"); +} + +void +ps2port_setup(void) +{ + ASSERT32FLAT(); + if (! CONFIG_PS2PORT) + return; + dprintf(3, "init ps2port\n"); + + enable_hwirq(1, FUNC16(entry_09)); + enable_hwirq(12, FUNC16(entry_74)); + + run_thread(ps2_keyboard_setup, NULL); +} |