h8.c

讲述linux的初始化过程

/* Called from console driver -- must make sure h8_enabled. */
int h8_display_unblank(void)
{
#ifdef CONFIG_H8_DISPLAY_BLANK
        int error;

        if (!h8_enabled)
                return 0;
        error = h8_set_display_power_state(H8_STATE_READY);
        if (error == H8_SUCCESS)
                return 1;
        h8_error("set display ready", error);
#endif
        return 0;
}

int
h8_alloc_queues(void)
{
        h8_cmd_q_t *qp;
	unsigned long flags;
        int i;

        qp = (h8_cmd_q_t *)kmalloc((sizeof (h8_cmd_q_t) * H8_Q_ALLOC_AMOUNT),
				   GFP_KERNEL);

        if (!qp) {
                printk("H8: could not allocate memory for command queue\n");
                return(0);
        }
        /* add to the free queue */
        save_flags(flags); cli();
        for (i = 0; i < H8_Q_ALLOC_AMOUNT; i++) {
                /* place each at front of freeq */
                list_add(&qp[i].link, &h8_freeq);
        }
        restore_flags(flags);
        return (1);
}

/* 
 * Basic means by which commands are sent to the H8.
 */
void
h8_q_cmd(u_char *cmd, int cmd_size, int resp_size)
{
        h8_cmd_q_t      *qp;
	unsigned long flags;
        int             i;

        /* get cmd buf */
	save_flags(flags); cli();
        while (list_empty(&h8_freeq)) {
                Dprintk("H8: need to allocate more cmd buffers\n");
                restore_flags(flags);
                h8_alloc_queues();
                save_flags(flags); cli();
        }
        /* get first element from queue */
        qp = list_entry(h8_freeq.next, h8_cmd_q_t, link);
        list_del(&qp->link);

        restore_flags(flags);

        /* fill it in */
        for (i = 0; i < cmd_size; i++)
            qp->cmdbuf[i] = cmd[i];
        qp->ncmd = cmd_size;
        qp->nrsp = resp_size;

        /* queue it at the end of the cmd queue */
        save_flags(flags); cli();

        /* XXX this actually puts it at the start of cmd queue, bug? */
        list_add(&qp->link, &h8_cmdq);

        restore_flags(flags);

        h8_start_new_cmd();
}

void
h8_start_new_cmd(void)
{
        unsigned long flags;
        h8_cmd_q_t *qp;

	save_flags(flags); cli();
        if (h8_state != H8_IDLE) {
                if (h8_debug & 0x1)
                        Dprintk("h8_start_new_cmd: not idle\n");
                restore_flags(flags);
                return;
        }

        if (!list_empty(&h8_actq)) {
                Dprintk("h8_start_new_cmd: inconsistency: IDLE with non-empty active queue!\n");
                restore_flags(flags);
                return;
        }

        if (list_empty(&h8_cmdq)) {
                Dprintk("h8_start_new_cmd: no command to dequeue\n");
                restore_flags(flags);
                return;
        }
        /*
         * Take first command off of the command queue and put
         * it on the active queue.
         */
        qp = list_entry(h8_cmdq.next, h8_cmd_q_t, link);
        list_del(&qp->link);
        /* XXX should this go to the end of the active queue? */
        list_add(&qp->link, &h8_actq);
        h8_state = H8_XMIT;
        if (h8_debug & 0x1)
                Dprintk("h8_start_new_cmd: Starting a command\n");

        qp->cnt = 1;
        WRITE_CMD(qp->cmdbuf[0]);               /* Kick it off */

        restore_flags(flags);
        return;
}

void
h8_send_next_cmd_byte(void)
{
        h8_cmd_q_t      *qp = list_entry(h8_actq.next, h8_cmd_q_t, link);
        int cnt;

        cnt = qp->cnt;
        qp->cnt++;

        if (h8_debug & 0x1)
                Dprintk("h8 sending next cmd byte 0x%x (0x%x)\n",
			cnt, qp->cmdbuf[cnt]);

        if (cnt) {
                WRITE_DATA(qp->cmdbuf[cnt]);
        } else {
                WRITE_CMD(qp->cmdbuf[cnt]);
        }
        return;
}

/*
 * Synchronize H8 communications channel for command transmission.
 */
void
h8_sync(void)
{
        u_char  buf[H8_MAX_CMD_SIZE];

        buf[0] = H8_SYNC;
        buf[1] = H8_SYNC_BYTE;
        h8_q_cmd(buf, 2, 1);
}

/*
 * Responds to external interrupt. Reads event status word and 
 * decodes type of interrupt. 
 */
void
h8_read_event_status(void)
{

        if(h8_debug & 0x200)
                printk("h8_read_event_status: value 0x%x\n", intrbuf.word);

        /*
         * Power related items
         */
        if (intrbuf.word & H8_DC_CHANGE) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: DC_CHANGE\n");
                /* see if dc added or removed, set batt/dc flag, send event */

                h8_set_event_mask(H8_MANAGE_BATTERY);
                wake_up(&h8_monitor_wait);
        }

        if (intrbuf.word & H8_POWER_BUTTON) {
                printk("Power switch pressed - please wait - preparing to power 
off\n");
                h8_set_event_mask(H8_POWER_BUTTON);
                wake_up(&h8_monitor_wait);
        }

        /*
         * Thermal related items
         */
        if (intrbuf.word & H8_THERMAL_THRESHOLD) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: THERMAL_THRESHOLD\n");
                h8_set_event_mask(H8_MANAGE_UTHERM);
                wake_up(&h8_monitor_wait);
        }

        /*
         * nops -for now
         */
        if (intrbuf.word & H8_DOCKING_STATION_STATUS) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: DOCKING_STATION_STATUS\n");
                /* read_ext_status */
        }
        if (intrbuf.word & H8_EXT_BATT_STATUS) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: EXT_BATT_STATUS\n");

        }
        if (intrbuf.word & H8_EXT_BATT_CHARGE_STATE) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: EXT_BATT_CHARGE_STATE\n");

        }
        if (intrbuf.word & H8_BATT_CHANGE_OVER) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: BATT_CHANGE_OVER\n");

        }
        if (intrbuf.word & H8_WATCHDOG) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: WATCHDOG\n");
                /* nop */
        }
        if (intrbuf.word & H8_SHUTDOWN) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: SHUTDOWN\n");
                /* nop */
        }
        if (intrbuf.word & H8_KEYBOARD) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: KEYBOARD\n");
                /* nop */
        }
        if (intrbuf.word & H8_EXT_MOUSE_OR_CASE_SWITCH) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: EXT_MOUSE_OR_CASE_SWITCH\n");
                /* read_ext_status*/
        }
        if (intrbuf.word & H8_INT_BATT_LOW) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: INT_BATT_LOW\n");
                /* post event, warn user */
        }
        if (intrbuf.word & H8_INT_BATT_CHARGE_STATE) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: INT_BATT_CHARGE_STATE\n");
                /* nop - happens often */
        }
        if (intrbuf.word & H8_INT_BATT_STATUS) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: INT_BATT_STATUS\n");

        }
        if (intrbuf.word & H8_INT_BATT_CHARGE_THRESHOLD) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: INT_BATT_CHARGE_THRESHOLD\n");
                /* nop - happens often */
        }
        if (intrbuf.word & H8_EXT_BATT_LOW) {
		if(h8_debug & 0x4)
		    printk("h8_read_event_status: EXT_BATT_LOW\n");
                /*if no internal, post event, warn user */
                /* else nop */
        }

        return;
}

/*
 * Function called when H8 has performed requested command.
 */
void
h8_cmd_done(h8_cmd_q_t *qp)
{

        /* what to do */
        switch (qp->cmdbuf[0]) {
	case H8_SYNC:
	    if (h8_debug & 0x40000) 
	        printk("H8: Sync command done - byte returned was 0x%x\n", 
		       qp->rcvbuf[0]);
	    list_add(&qp->link, &h8_freeq);
	    break;

	case H8_RD_SN:
	case H8_RD_ENET_ADDR:
	    printk("H8: read Ethernet address: command done - address: %x - %x - %x - %x - %x - %x \n", 
		   qp->rcvbuf[0], qp->rcvbuf[1], qp->rcvbuf[2],
		   qp->rcvbuf[3], qp->rcvbuf[4], qp->rcvbuf[5]);
	    list_add(&qp->link, &h8_freeq);
	    break;

	case H8_RD_HW_VER:
	case H8_RD_MIC_VER:
	case H8_RD_MAX_TEMP:
	    printk("H8: Max recorded CPU temp %d, Sys temp %d\n",
		   qp->rcvbuf[0], qp->rcvbuf[1]);
	    list_add(&qp->link, &h8_freeq);
	    break;

	case H8_RD_MIN_TEMP:
	    printk("H8: Min recorded CPU temp %d, Sys temp %d\n",
		   qp->rcvbuf[0], qp->rcvbuf[1]);
	    list_add(&qp->link, &h8_freeq);
	    break;

	case H8_RD_CURR_TEMP:
	    h8_sync_channel |= H8_RD_CURR_TEMP;
	    xx.byte[0] = qp->rcvbuf[0];
	    xx.byte[1] = qp->rcvbuf[1];
	    wake_up(&h8_sync_wait); 
	    list_add(&qp->link, &h8_freeq);
	    break;

	case H8_RD_SYS_VARIENT:
	case H8_RD_PWR_ON_CYCLES:
	    printk(" H8: RD_PWR_ON_CYCLES command done\n");
	    break;

	case H8_RD_PWR_ON_SECS:
	    printk("H8: RD_PWR_ON_SECS command done\n");
	    break;

	case H8_RD_RESET_STATUS:
	case H8_RD_PWR_DN_STATUS:
	case H8_RD_EVENT_STATUS:
	case H8_RD_ROM_CKSM:
	case H8_RD_EXT_STATUS:
	    xx.byte[1] = qp->rcvbuf[0];
	    xx.byte[0] = qp->rcvbuf[1];
	    h8_sync_channel |= H8_GET_EXT_STATUS;
	    wake_up(&h8_sync_wait); 
	    list_add(&qp->link, &h8_freeq);
	    break;

	case H8_RD_USER_CFG:
	case H8_RD_INT_BATT_VOLT:
	case H8_RD_DC_INPUT_VOLT:
	case H8_RD_HORIZ_PTR_VOLT:
	case H8_RD_VERT_PTR_VOLT:
	case H8_RD_EEPROM_STATUS:
	case H8_RD_ERR_STATUS:
	case H8_RD_NEW_BUSY_SPEED:
	case H8_RD_CONFIG_INTERFACE:
	case H8_RD_INT_BATT_STATUS:
	    printk("H8: Read int batt status cmd done - returned was %x %x %x\n",
		   qp->rcvbuf[0], qp->rcvbuf[1], qp->rcvbuf[2]);
	    list_add(&qp->link, &h8_freeq);
	    break;

	case H8_RD_EXT_BATT_STATUS:
	case H8_RD_PWR_UP_STATUS:
	case H8_RD_EVENT_STATUS_MASK:
	case H8_CTL_EMU_BITPORT:
	case H8_DEVICE_CONTROL:
	    if(h8_debug & 0x20000) {
	        printk("H8: Device control cmd done - byte returned was 0x%x\n",
		       qp->rcvbuf[0]);
	    }
	    list_add(&qp->link, &h8_freeq);
	    break;

	case H8_CTL_TFT_BRT_DC:
	case H8_CTL_WATCHDOG:
	case H8_CTL_MIC_PROT:
	case H8_CTL_INT_BATT_CHG:
	case H8_CTL_EXT_BATT_CHG:
	case H8_CTL_MARK_SPACE:
	case H8_CTL_MOUSE_SENSITIVITY:
	case H8_CTL_DIAG_MODE:
	case H8_CTL_IDLE_AND_BUSY_SPDS:
	    printk("H8: Idle and busy speed command done\n");
	    break;

	case H8_CTL_TFT_BRT_BATT:
	case H8_CTL_UPPER_TEMP:
	    if(h8_debug & 0x10) {
	        XDprintk("H8: ctl upper thermal thresh cmd done - returned was %d\n",
		       qp->rcvbuf[0]);
	    }
	    list_add(&qp->link, &h8_freeq);
	    break;

	case H8_CTL_LOWER_TEMP:
	case H8_CTL_TEMP_CUTOUT:
	case H8_CTL_WAKEUP:
	case H8_CTL_CHG_THRESHOLD:
	case H8_CTL_TURBO_MODE:
	case H8_SET_DIAG_STATUS:
	case H8_SOFTWARE_RESET: