qemu-patch-raspberry4/hw/sh7750.c

/*
 * SH7750 device
 *
 * Copyright (c) 2005 Samuel Tardieu
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include <stdio.h>
#include <assert.h>
#include "vl.h"
#include "sh7750_regs.h"
#include "sh7750_regnames.h"

typedef struct {
    uint8_t data[16];
    uint8_t length;		/* Number of characters in the FIFO */
    uint8_t write_idx;		/* Index of first character to write */
    uint8_t read_idx;		/* Index of first character to read */
} fifo;

#define NB_DEVICES 4

typedef struct SH7750State {
    /* CPU */
    CPUSH4State *cpu;
    /* Peripheral frequency in Hz */
    uint32_t periph_freq;
    /* SDRAM controller */
    uint16_t rfcr;
    /* First serial port */
    CharDriverState *serial1;
    uint8_t scscr1;
    uint8_t scsmr1;
    uint8_t scbrr1;
    uint8_t scssr1;
    uint8_t scssr1_read;
    uint8_t sctsr1;
    uint8_t sctsr1_loaded;
    uint8_t sctdr1;
    uint8_t scrdr1;
    /* Second serial port */
    CharDriverState *serial2;
    uint16_t sclsr2;
    uint16_t scscr2;
    uint16_t scfcr2;
    uint16_t scfsr2;
    uint16_t scsmr2;
    uint8_t scbrr2;
    fifo serial2_receive_fifo;
    fifo serial2_transmit_fifo;
    /* IO ports */
    uint16_t gpioic;
    uint32_t pctra;
    uint32_t pctrb;
    uint16_t portdira;		/* Cached */
    uint16_t portpullupa;	/* Cached */
    uint16_t portdirb;		/* Cached */
    uint16_t portpullupb;	/* Cached */
    uint16_t pdtra;
    uint16_t pdtrb;
    uint16_t periph_pdtra;	/* Imposed by the peripherals */
    uint16_t periph_portdira;	/* Direction seen from the peripherals */
    uint16_t periph_pdtrb;	/* Imposed by the peripherals */
    uint16_t periph_portdirb;	/* Direction seen from the peripherals */
    sh7750_io_device *devices[NB_DEVICES];	/* External peripherals */
    /* Cache */
    uint32_t ccr;

} SH7750State;

/**********************************************************************
 First serial port
**********************************************************************/

static int serial1_can_receive(void *opaque)
{
    SH7750State *s = opaque;

    return s->scscr1 & SH7750_SCSCR_RE;
}

static void serial1_receive_char(SH7750State * s, uint8_t c)
{
    if (s->scssr1 & SH7750_SCSSR1_RDRF) {
	s->scssr1 |= SH7750_SCSSR1_ORER;
	return;
    }

    s->scrdr1 = c;
    s->scssr1 |= SH7750_SCSSR1_RDRF;
}

static void serial1_receive(void *opaque, const uint8_t * buf, int size)
{
    SH7750State *s = opaque;
    int i;

    for (i = 0; i < size; i++) {
	serial1_receive_char(s, buf[i]);
    }
}

static void serial1_event(void *opaque, int event)
{
    assert(0);
}

static void serial1_maybe_send(SH7750State * s)
{
    uint8_t c;

    if (s->scssr1 & SH7750_SCSSR1_TDRE)
	return;
    c = s->sctdr1;
    s->scssr1 |= SH7750_SCSSR1_TDRE | SH7750_SCSSR1_TEND;
    if (s->scscr1 & SH7750_SCSCR_TIE) {
	fprintf(stderr, "interrupts for serial port 1 not implemented\n");
	assert(0);
    }
    /* XXXXX Check for errors in write */
    qemu_chr_write(s->serial1, &c, 1);
}

static void serial1_change_scssr1(SH7750State * s, uint8_t mem_value)
{
    uint8_t new_flags;

    /* If transmit disable, TDRE and TEND stays up */
    if ((s->scscr1 & SH7750_SCSCR_TE) == 0) {
	mem_value |= SH7750_SCSSR1_TDRE | SH7750_SCSSR1_TEND;
    }

    /* Only clear bits which have been read before and do not set any bit
       in the flags */
    new_flags = s->scssr1 & ~s->scssr1_read;	/* Preserve unread flags */
    new_flags &= mem_value | ~s->scssr1_read;	/* Clear read flags */

    s->scssr1 = (new_flags & 0xf8) | (mem_value & 1);
    s->scssr1_read &= mem_value;

    /* If TDRE has been cleared, TEND will also be cleared */
    if ((s->scssr1 & SH7750_SCSSR1_TDRE) == 0) {
	s->scssr1 &= ~SH7750_SCSSR1_TEND;
    }

    /* Check for transmission to start */
    serial1_maybe_send(s);
}

static void serial1_update_parameters(SH7750State * s)
{
    QEMUSerialSetParams ssp;

    if (s->scsmr1 & SH7750_SCSMR_CHR_7)
	ssp.data_bits = 7;
    else
	ssp.data_bits = 8;
    if (s->scsmr1 & SH7750_SCSMR_PE) {
	if (s->scsmr1 & SH7750_SCSMR_PM_ODD)
	    ssp.parity = 'O';
	else
	    ssp.parity = 'E';
    } else
	ssp.parity = 'N';
    if (s->scsmr1 & SH7750_SCSMR_STOP_2)
	ssp.stop_bits = 2;
    else
	ssp.stop_bits = 1;
    fprintf(stderr, "SCSMR1=%04x SCBRR1=%02x\n", s->scsmr1, s->scbrr1);
    ssp.speed = s->periph_freq /
	(32 * s->scbrr1 * (1 << (2 * (s->scsmr1 & 3)))) - 1;
    fprintf(stderr, "data bits=%d, stop bits=%d, parity=%c, speed=%d\n",
	    ssp.data_bits, ssp.stop_bits, ssp.parity, ssp.speed);
    qemu_chr_ioctl(s->serial1, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
}

static void scscr1_changed(SH7750State * s)
{
    if (s->scscr1 & (SH7750_SCSCR_TE | SH7750_SCSCR_RE)) {
	if (!s->serial1) {
	    fprintf(stderr, "serial port 1 not bound to anything\n");
	    assert(0);
	}
	serial1_update_parameters(s);
    }
    if ((s->scscr1 & SH7750_SCSCR_RE) == 0) {
	s->scssr1 |= SH7750_SCSSR1_TDRE;
    }
}

static void init_serial1(SH7750State * s, int serial_nb)
{
    CharDriverState *chr;

    s->scssr1 = 0x84;
    chr = serial_hds[serial_nb];
    if (!chr) {
	fprintf(stderr,
		"no serial port associated to SH7750 first serial port\n");
	return;
    }

    s->serial1 = chr;
    qemu_chr_add_handlers(chr, serial1_can_receive,
			  serial1_receive, serial1_event, s);
}

/**********************************************************************
 Second serial port
**********************************************************************/

static int serial2_can_receive(void *opaque)
{
    SH7750State *s = opaque;
    static uint8_t max_fifo_size[] = { 15, 1, 4, 6, 8, 10, 12, 14 };

    return s->serial2_receive_fifo.length <
	max_fifo_size[(s->scfcr2 >> 9) & 7];
}

static void serial2_adjust_receive_flags(SH7750State * s)
{
    static uint8_t max_fifo_size[] = { 1, 4, 8, 14 };

    /* XXXXX Add interrupt generation */
    if (s->serial2_receive_fifo.length >=
	max_fifo_size[(s->scfcr2 >> 7) & 3]) {
	s->scfsr2 |= SH7750_SCFSR2_RDF;
	s->scfsr2 &= ~SH7750_SCFSR2_DR;
    } else {
	s->scfsr2 &= ~SH7750_SCFSR2_RDF;
	if (s->serial2_receive_fifo.length > 0)
	    s->scfsr2 |= SH7750_SCFSR2_DR;
	else
	    s->scfsr2 &= ~SH7750_SCFSR2_DR;
    }
}

static void serial2_append_char(SH7750State * s, uint8_t c)
{
    if (s->serial2_receive_fifo.length == 16) {
	/* Overflow */
	s->sclsr2 |= SH7750_SCLSR2_ORER;
	return;
    }

    s->serial2_receive_fifo.data[s->serial2_receive_fifo.write_idx++] = c;
    s->serial2_receive_fifo.length++;
    serial2_adjust_receive_flags(s);
}

static void serial2_receive(void *opaque, const uint8_t * buf, int size)
{
    SH7750State *s = opaque;
    int i;

    for (i = 0; i < size; i++)
	serial2_append_char(s, buf[i]);
}

static void serial2_event(void *opaque, int event)
{
    /* XXXXX */
    assert(0);
}

static void serial2_update_parameters(SH7750State * s)
{
    QEMUSerialSetParams ssp;

    if (s->scsmr2 & SH7750_SCSMR_CHR_7)
	ssp.data_bits = 7;
    else
	ssp.data_bits = 8;
    if (s->scsmr2 & SH7750_SCSMR_PE) {
	if (s->scsmr2 & SH7750_SCSMR_PM_ODD)
	    ssp.parity = 'O';
	else
	    ssp.parity = 'E';
    } else
	ssp.parity = 'N';
    if (s->scsmr2 & SH7750_SCSMR_STOP_2)
	ssp.stop_bits = 2;
    else
	ssp.stop_bits = 1;
    fprintf(stderr, "SCSMR2=%04x SCBRR2=%02x\n", s->scsmr2, s->scbrr2);
    ssp.speed = s->periph_freq /
	(32 * s->scbrr2 * (1 << (2 * (s->scsmr2 & 3)))) - 1;
    fprintf(stderr, "data bits=%d, stop bits=%d, parity=%c, speed=%d\n",
	    ssp.data_bits, ssp.stop_bits, ssp.parity, ssp.speed);
    qemu_chr_ioctl(s->serial2, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
}

static void scscr2_changed(SH7750State * s)
{
    if (s->scscr2 & (SH7750_SCSCR_TE | SH7750_SCSCR_RE)) {
	if (!s->serial2) {
	    fprintf(stderr, "serial port 2 not bound to anything\n");
	    assert(0);
	}
	serial2_update_parameters(s);
    }
}

static void init_serial2(SH7750State * s, int serial_nb)
{
    CharDriverState *chr;

    s->scfsr2 = 0x0060;

    chr = serial_hds[serial_nb];
    if (!chr) {
	fprintf(stderr,
		"no serial port associated to SH7750 second serial port\n");
	return;
    }

    s->serial2 = chr;
    qemu_chr_add_handlers(chr, serial2_can_receive,
			  serial2_receive, serial1_event, s);
}

static void init_serial_ports(SH7750State * s)
{
    init_serial1(s, 0);
    init_serial2(s, 1);
}

/**********************************************************************
 I/O ports
**********************************************************************/

int sh7750_register_io_device(SH7750State * s, sh7750_io_device * device)
{
    int i;

    for (i = 0; i < NB_DEVICES; i++) {
	if (s->devices[i] == NULL) {
	    s->devices[i] = device;
	    return 0;
	}
    }
    return -1;
}

static uint16_t portdir(uint32_t v)
{
#define EVENPORTMASK(n) ((v & (1<<((n)<<1))) >> (n))
    return
	EVENPORTMASK(15) | EVENPORTMASK(14) | EVENPORTMASK(13) |
	EVENPORTMASK(12) | EVENPORTMASK(11) | EVENPORTMASK(10) |
	EVENPORTMASK(9) | EVENPORTMASK(8) | EVENPORTMASK(7) |
	EVENPORTMASK(6) | EVENPORTMASK(5) | EVENPORTMASK(4) |
	EVENPORTMASK(3) | EVENPORTMASK(2) | EVENPORTMASK(1) |
	EVENPORTMASK(0);
}

static uint16_t portpullup(uint32_t v)
{
#define ODDPORTMASK(n) ((v & (1<<(((n)<<1)+1))) >> (n))
    return
	ODDPORTMASK(15) | ODDPORTMASK(14) | ODDPORTMASK(13) |
	ODDPORTMASK(12) | ODDPORTMASK(11) | ODDPORTMASK(10) |
	ODDPORTMASK(9) | ODDPORTMASK(8) | ODDPORTMASK(7) | ODDPORTMASK(6) |
	ODDPORTMASK(5) | ODDPORTMASK(4) | ODDPORTMASK(3) | ODDPORTMASK(2) |
	ODDPORTMASK(1) | ODDPORTMASK(0);
}

static uint16_t porta_lines(SH7750State * s)
{
    return (s->portdira & s->pdtra) |	/* CPU */
	(s->periph_portdira & s->periph_pdtra) |	/* Peripherals */
	(~(s->portdira | s->periph_portdira) & s->portpullupa);	/* Pullups */
}

static uint16_t portb_lines(SH7750State * s)
{
    return (s->portdirb & s->pdtrb) |	/* CPU */
	(s->periph_portdirb & s->periph_pdtrb) |	/* Peripherals */
	(~(s->portdirb | s->periph_portdirb) & s->portpullupb);	/* Pullups */
}

static void gen_port_interrupts(SH7750State * s)
{
    /* XXXXX interrupts not generated */
}

static void porta_changed(SH7750State * s, uint16_t prev)
{
    uint16_t currenta, changes;
    int i, r = 0;

#if 0
    fprintf(stderr, "porta changed from 0x%04x to 0x%04x\n",
	    prev, porta_lines(s));
    fprintf(stderr, "pdtra=0x%04x, pctra=0x%08x\n", s->pdtra, s->pctra);
#endif
    currenta = porta_lines(s);
    if (currenta == prev)
	return;
    changes = currenta ^ prev;

    for (i = 0; i < NB_DEVICES; i++) {
	if (s->devices[i] && (s->devices[i]->portamask_trigger & changes)) {
	    r |= s->devices[i]->port_change_cb(currenta, portb_lines(s),
					       &s->periph_pdtra,
					       &s->periph_portdira,
					       &s->periph_pdtrb,
					       &s->periph_portdirb);
	}
    }

    if (r)
	gen_port_interrupts(s);
}

static void portb_changed(SH7750State * s, uint16_t prev)
{
    uint16_t currentb, changes;
    int i, r = 0;

    currentb = portb_lines(s);
    if (currentb == prev)
	return;
    changes = currentb ^ prev;

    for (i = 0; i < NB_DEVICES; i++) {
	if (s->devices[i] && (s->devices[i]->portbmask_trigger & changes)) {
	    r |= s->devices[i]->port_change_cb(portb_lines(s), currentb,
					       &s->periph_pdtra,
					       &s->periph_portdira,
					       &s->periph_pdtrb,
					       &s->periph_portdirb);
	}
    }

    if (r)
	gen_port_interrupts(s);
}

/**********************************************************************
 Memory
**********************************************************************/

static void error_access(const char *kind, target_phys_addr_t addr)
{
    fprintf(stderr, "%s to %s (0x%08x) not supported\n",
	    kind, regname(addr), addr);
}

static void ignore_access(const char *kind, target_phys_addr_t addr)
{
    fprintf(stderr, "%s to %s (0x%08x) ignored\n",
	    kind, regname(addr), addr);
}

static uint32_t sh7750_mem_readb(void *opaque, target_phys_addr_t addr)
{
    SH7750State *s = opaque;
    uint8_t r;

    switch (addr) {
    case SH7750_SCSSR1_A7:
	r = s->scssr1;
	s->scssr1_read |= r;
	return s->scssr1;
    case SH7750_SCRDR1_A7:
	s->scssr1 &= ~SH7750_SCSSR1_RDRF;
	return s->scrdr1;
    default:
	error_access("byte read", addr);
	assert(0);
    }
}

static uint32_t sh7750_mem_readw(void *opaque, target_phys_addr_t addr)
{
    SH7750State *s = opaque;
    uint16_t r;

    switch (addr) {
    case SH7750_RFCR_A7:
	fprintf(stderr,
		"Read access to refresh count register, incrementing\n");
	return s->rfcr++;
    case SH7750_SCLSR2_A7:
	/* Read and clear overflow bit */
	r = s->sclsr2;
	s->sclsr2 = 0;
	return r;
    case SH7750_SCSFR2_A7:
	return s->scfsr2;
    case SH7750_PDTRA_A7:
	return porta_lines(s);
    case SH7750_PDTRB_A7:
	return portb_lines(s);
    default:
	error_access("word read", addr);
	assert(0);
    }
}

static uint32_t sh7750_mem_readl(void *opaque, target_phys_addr_t addr)
{
    SH7750State *s = opaque;

    switch (addr) {
    case SH7750_MMUCR_A7:
	return s->cpu->mmucr;
    case SH7750_PTEH_A7:
	return s->cpu->pteh;
    case SH7750_PTEL_A7:
	return s->cpu->ptel;
    case SH7750_TTB_A7:
	return s->cpu->ttb;
    case SH7750_TEA_A7:
	return s->cpu->tea;
    case SH7750_TRA_A7:
	return s->cpu->tra;
    case SH7750_EXPEVT_A7:
	return s->cpu->expevt;
    case SH7750_INTEVT_A7:
	return s->cpu->intevt;
    case SH7750_CCR_A7:
	return s->ccr;
    case 0x1f000030:		/* Processor version PVR */
	return 0x00050000;	/* SH7750R */
    case 0x1f000040:		/* Processor version CVR */
	return 0x00110000;	/* Minimum caches */
    case 0x1f000044:		/* Processor version PRR */
	return 0x00000100;	/* SH7750R */
    default:
	error_access("long read", addr);
	assert(0);
    }
}

static void sh7750_mem_writeb(void *opaque, target_phys_addr_t addr,
			      uint32_t mem_value)
{
    SH7750State *s = opaque;

    switch (addr) {
	/* PRECHARGE ? XXXXX */
    case SH7750_PRECHARGE0_A7:
    case SH7750_PRECHARGE1_A7:
	ignore_access("byte write", addr);
	return;
    case SH7750_SCBRR2_A7:
	s->scbrr2 = mem_value;
	return;
    case SH7750_SCSCR1_A7:
	s->scscr1 = mem_value;
	scscr1_changed(s);
	return;
    case SH7750_SCSMR1_A7:
	s->scsmr1 = mem_value;
	return;
    case SH7750_SCBRR1_A7:
	s->scbrr1 = mem_value;
	return;
    case SH7750_SCTDR1_A7:
	s->scssr1 &= ~SH7750_SCSSR1_TEND;
	s->sctdr1 = mem_value;
	return;
    case SH7750_SCSSR1_A7:
	serial1_change_scssr1(s, mem_value);
	return;
    default:
	error_access("byte write", addr);
	assert(0);
    }
}

static void sh7750_mem_writew(void *opaque, target_phys_addr_t addr,
			      uint32_t mem_value)
{
    SH7750State *s = opaque;
    uint16_t temp;

    switch (addr) {
	/* SDRAM controller */
    case SH7750_SCBRR1_A7:
    case SH7750_SCBRR2_A7:
    case SH7750_BCR2_A7:
    case SH7750_BCR3_A7:
    case SH7750_RTCOR_A7:
    case SH7750_RTCNT_A7:
    case SH7750_RTCSR_A7:
	ignore_access("word write", addr);
	return;
	/* IO ports */
    case SH7750_PDTRA_A7:
	temp = porta_lines(s);
	s->pdtra = mem_value;
	porta_changed(s, temp);
	return;
    case SH7750_PDTRB_A7:
	temp = portb_lines(s);
	s->pdtrb = mem_value;
	portb_changed(s, temp);
	return;
    case SH7750_RFCR_A7:
	fprintf(stderr, "Write access to refresh count register\n");
	s->rfcr = mem_value;
	return;
    case SH7750_SCLSR2_A7:
	s->sclsr2 = mem_value;
	return;
    case SH7750_SCSCR2_A7:
	s->scscr2 = mem_value;
	scscr2_changed(s);
	return;
    case SH7750_SCFCR2_A7:
	s->scfcr2 = mem_value;
	return;
    case SH7750_SCSMR2_A7:
	s->scsmr2 = mem_value;
	return;
    case SH7750_GPIOIC_A7:
	s->gpioic = mem_value;
	if (mem_value != 0) {
	    fprintf(stderr, "I/O interrupts not implemented\n");
	    assert(0);
	}
	return;
    default:
	error_access("word write", addr);
	assert(0);
    }
}

static void sh7750_mem_writel(void *opaque, target_phys_addr_t addr,
			      uint32_t mem_value)
{
    SH7750State *s = opaque;
    uint16_t temp;

    switch (addr) {
	/* SDRAM controller */
    case SH7750_BCR1_A7:
    case SH7750_BCR4_A7:
    case SH7750_WCR1_A7:
    case SH7750_WCR2_A7:
    case SH7750_WCR3_A7:
    case SH7750_MCR_A7:
	ignore_access("long write", addr);
	return;
	/* IO ports */
    case SH7750_PCTRA_A7:
	temp = porta_lines(s);
	s->pctra = mem_value;
	s->portdira = portdir(mem_value);
	s->portpullupa = portpullup(mem_value);
	porta_changed(s, temp);
	return;
    case SH7750_PCTRB_A7:
	temp = portb_lines(s);
	s->pctrb = mem_value;
	s->portdirb = portdir(mem_value);
	s->portpullupb = portpullup(mem_value);
	portb_changed(s, temp);
	return;
    case SH7750_MMUCR_A7:
	s->cpu->mmucr = mem_value;
	return;
    case SH7750_PTEH_A7:
	s->cpu->pteh = mem_value;
	return;
    case SH7750_PTEL_A7:
	s->cpu->ptel = mem_value;
	return;
    case SH7750_TTB_A7:
	s->cpu->ttb = mem_value;
	return;
    case SH7750_TEA_A7:
	s->cpu->tea = mem_value;
	return;
    case SH7750_TRA_A7:
	s->cpu->tra = mem_value & 0x000007ff;
	return;
    case SH7750_EXPEVT_A7:
	s->cpu->expevt = mem_value & 0x000007ff;
	return;
    case SH7750_INTEVT_A7:
	s->cpu->intevt = mem_value & 0x000007ff;
	return;
    case SH7750_CCR_A7:
	s->ccr = mem_value;
	return;
    default:
	error_access("long write", addr);
	assert(0);
    }
}

static CPUReadMemoryFunc *sh7750_mem_read[] = {
    sh7750_mem_readb,
    sh7750_mem_readw,
    sh7750_mem_readl
};

static CPUWriteMemoryFunc *sh7750_mem_write[] = {
    sh7750_mem_writeb,
    sh7750_mem_writew,
    sh7750_mem_writel
};

SH7750State *sh7750_init(CPUSH4State * cpu)
{
    SH7750State *s;
    int sh7750_io_memory;

    s = qemu_mallocz(sizeof(SH7750State));
    s->cpu = cpu;
    s->periph_freq = 60000000;	/* 60MHz */
    sh7750_io_memory = cpu_register_io_memory(0,
					      sh7750_mem_read,
					      sh7750_mem_write, s);
    cpu_register_physical_memory(0x1c000000, 0x04000000, sh7750_io_memory);
    init_serial_ports(s);

    tmu012_init(0x1fd80000,
		TMU012_FEAT_TOCR | TMU012_FEAT_3CHAN | TMU012_FEAT_EXTCLK,
		s->periph_freq);
    tmu012_init(0x1e100000, 0, s->periph_freq);
    return s;
}