cbus.c

xen虚拟机源代码安装包

/*
 * CBUS three-pin bus and the Retu / Betty / Tahvo / Vilma / Avilma /
 * Hinku / Vinku / Ahne / Pihi chips used in various Nokia platforms.
 * Based on reverse-engineering of a linux driver.
 *
 * Copyright (C) 2008 Nokia Corporation
 * Written by Andrzej Zaborowski <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 or
 * (at your option) version 3 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include "qemu-common.h"
#include "irq.h"
#include "devices.h"
#include "sysemu.h"

//#define DEBUG

struct cbus_slave_s;
struct cbus_priv_s {
    struct cbus_s cbus;

    int sel;
    int dat;
    int clk;
    int bit;
    int dir;
    uint16_t val;
    qemu_irq dat_out;

    int addr;
    int reg;
    int rw;
    enum {
        cbus_address,
        cbus_value,
    } cycle;

    struct cbus_slave_s *slave[8];
};

struct cbus_slave_s {
    void *opaque;
    void (*io)(void *opaque, int rw, int reg, uint16_t *val);
    int addr;
};

static void cbus_io(struct cbus_priv_s *s)
{
    if (s->slave[s->addr])
        s->slave[s->addr]->io(s->slave[s->addr]->opaque,
                        s->rw, s->reg, &s->val);
    else
        cpu_abort(cpu_single_env, "%s: bad slave address %i\n",
                        __FUNCTION__, s->addr);
}

static void cbus_cycle(struct cbus_priv_s *s)
{
    switch (s->cycle) {
    case cbus_address:
        s->addr = (s->val >> 6) & 7;
        s->rw =   (s->val >> 5) & 1;
        s->reg =  (s->val >> 0) & 0x1f;

        s->cycle = cbus_value;
        s->bit = 15;
        s->dir = !s->rw;
        s->val = 0;

        if (s->rw)
            cbus_io(s);
        break;

    case cbus_value:
        if (!s->rw)
            cbus_io(s);

        s->cycle = cbus_address;
        s->bit = 8;
        s->dir = 1;
        s->val = 0;
        break;
    }
}

static void cbus_clk(void *opaque, int line, int level)
{
    struct cbus_priv_s *s = (struct cbus_priv_s *) opaque;

    if (!s->sel && level && !s->clk) {
        if (s->dir)
            s->val |= s->dat << (s->bit --);
        else
            qemu_set_irq(s->dat_out, (s->val >> (s->bit --)) & 1);

        if (s->bit < 0)
            cbus_cycle(s);
    }

    s->clk = level;
}

static void cbus_dat(void *opaque, int line, int level)
{
    struct cbus_priv_s *s = (struct cbus_priv_s *) opaque;

    s->dat = level;
}

static void cbus_sel(void *opaque, int line, int level)
{
    struct cbus_priv_s *s = (struct cbus_priv_s *) opaque;

    if (!level) {
        s->dir = 1;
        s->bit = 8;
        s->val = 0;
    }

    s->sel = level;
}

struct cbus_s *cbus_init(qemu_irq dat)
{
    struct cbus_priv_s *s = (struct cbus_priv_s *) qemu_mallocz(sizeof(*s));

    s->dat_out = dat;
    s->cbus.clk = qemu_allocate_irqs(cbus_clk, s, 1)[0];
    s->cbus.dat = qemu_allocate_irqs(cbus_dat, s, 1)[0];
    s->cbus.sel = qemu_allocate_irqs(cbus_sel, s, 1)[0];

    s->sel = 1;
    s->clk = 0;
    s->dat = 0;

    return &s->cbus;
}

void cbus_attach(struct cbus_s *bus, void *slave_opaque)
{
    struct cbus_slave_s *slave = (struct cbus_slave_s *) slave_opaque;
    struct cbus_priv_s *s = (struct cbus_priv_s *) bus;

    s->slave[slave->addr] = slave;
}

/* Retu/Vilma */
struct cbus_retu_s {
    uint16_t irqst;
    uint16_t irqen;
    uint16_t cc[2];
    int channel;
    uint16_t result[16];
    uint16_t sample;
    uint16_t status;

    struct {
        uint16_t cal;
    } rtc;

    int is_vilma;
    qemu_irq irq;
    struct cbus_slave_s cbus;
};

static void retu_interrupt_update(struct cbus_retu_s *s)
{
    qemu_set_irq(s->irq, s->irqst & ~s->irqen);
}

#define RETU_REG_ASICR		0x00	/* (RO) ASIC ID & revision */
#define RETU_REG_IDR		0x01	/* (T)  Interrupt ID */
#define RETU_REG_IMR		0x02	/* (RW) Interrupt mask */
#define RETU_REG_RTCDSR		0x03	/* (RW) RTC seconds register */
#define RETU_REG_RTCHMR		0x04	/* (RO) RTC hours and minutes reg */
#define RETU_REG_RTCHMAR	0x05	/* (RW) RTC hours and minutes set reg */
#define RETU_REG_RTCCALR	0x06	/* (RW) RTC calibration register */
#define RETU_REG_ADCR		0x08	/* (RW) ADC result register */
#define RETU_REG_ADCSCR		0x09	/* (RW) ADC sample control register */
#define RETU_REG_AFCR		0x0a	/* (RW) AFC register */
#define RETU_REG_ANTIFR		0x0b	/* (RW) AntiF register */
#define RETU_REG_CALIBR		0x0c	/* (RW) CalibR register*/
#define RETU_REG_CCR1		0x0d	/* (RW) Common control register 1 */
#define RETU_REG_CCR2		0x0e	/* (RW) Common control register 2 */
#define RETU_REG_RCTRL_CLR	0x0f	/* (T)  Regulator clear register */
#define RETU_REG_RCTRL_SET	0x10	/* (T)  Regulator set register */
#define RETU_REG_TXCR		0x11	/* (RW) TxC register */
#define RETU_REG_STATUS		0x16	/* (RO) Status register */
#define RETU_REG_WATCHDOG	0x17	/* (RW) Watchdog register */
#define RETU_REG_AUDTXR		0x18	/* (RW) Audio Codec Tx register */
#define RETU_REG_AUDPAR		0x19	/* (RW) AudioPA register */
#define RETU_REG_AUDRXR1	0x1a	/* (RW) Audio receive register 1 */
#define RETU_REG_AUDRXR2	0x1b	/* (RW) Audio receive register 2 */
#define RETU_REG_SGR1		0x1c	/* (RW) */
#define RETU_REG_SCR1		0x1d	/* (RW) */
#define RETU_REG_SGR2		0x1e	/* (RW) */
#define RETU_REG_SCR2		0x1f	/* (RW) */

/* Retu Interrupt sources */
enum {
    retu_int_pwr	= 0,	/* Power button */
    retu_int_char	= 1,	/* Charger */
    retu_int_rtcs	= 2,	/* Seconds */
    retu_int_rtcm	= 3,	/* Minutes */
    retu_int_rtcd	= 4,	/* Days */
    retu_int_rtca	= 5,	/* Alarm */
    retu_int_hook	= 6,	/* Hook */
    retu_int_head	= 7,	/* Headset */
    retu_int_adcs	= 8,	/* ADC sample */
};

/* Retu ADC channel wiring */
enum {
    retu_adc_bsi	= 1,	/* BSI */
    retu_adc_batt_temp	= 2,	/* Battery temperature */
    retu_adc_chg_volt	= 3,	/* Charger voltage */
    retu_adc_head_det	= 4,	/* Headset detection */
    retu_adc_hook_det	= 5,	/* Hook detection */
    retu_adc_rf_gp	= 6,	/* RF GP */
    retu_adc_tx_det	= 7,	/* Wideband Tx detection */
    retu_adc_batt_volt	= 8,	/* Battery voltage */
    retu_adc_sens	= 10,	/* Light sensor */
    retu_adc_sens_temp	= 11,	/* Light sensor temperature */
    retu_adc_bbatt_volt	= 12,	/* Backup battery voltage */
    retu_adc_self_temp	= 13,	/* RETU temperature */
};

static inline uint16_t retu_read(struct cbus_retu_s *s, int reg)
{
#ifdef DEBUG
    printf("RETU read at %02x\n", reg);
#endif

    switch (reg) {
    case RETU_REG_ASICR:
        return 0x0215 | (s->is_vilma << 7);

    case RETU_REG_IDR:	/* TODO: Or is this ffs(s->irqst)?  */
        return s->irqst;

    case RETU_REG_IMR:
        return s->irqen;

    case RETU_REG_RTCDSR:
    case RETU_REG_RTCHMR:
    case RETU_REG_RTCHMAR:
        /* TODO */
        return 0x0000;

    case RETU_REG_RTCCALR:
        return s->rtc.cal;

    case RETU_REG_ADCR:
        return (s->channel << 10) | s->result[s->channel];
    case RETU_REG_ADCSCR:
        return s->sample;

    case RETU_REG_AFCR:
    case RETU_REG_ANTIFR:
    case RETU_REG_CALIBR:
        /* TODO */
        return 0x0000;

    case RETU_REG_CCR1:
        return s->cc[0];
    case RETU_REG_CCR2:
        return s->cc[1];

    case RETU_REG_RCTRL_CLR:
    case RETU_REG_RCTRL_SET:
    case RETU_REG_TXCR:
        /* TODO */
        return 0x0000;

    case RETU_REG_STATUS:
        return s->status;

    case RETU_REG_WATCHDOG:
    case RETU_REG_AUDTXR:
    case RETU_REG_AUDPAR:
    case RETU_REG_AUDRXR1:
    case RETU_REG_AUDRXR2:
    case RETU_REG_SGR1:
    case RETU_REG_SCR1:
    case RETU_REG_SGR2:
    case RETU_REG_SCR2:
        /* TODO */
        return 0x0000;

    default:
        cpu_abort(cpu_single_env, "%s: bad register %02x\n",
                        __FUNCTION__, reg);
    }
}

static inline void retu_write(struct cbus_retu_s *s, int reg, uint16_t val)
{
#ifdef DEBUG
    printf("RETU write of %04x at %02x\n", val, reg);