/* $Id: s3c2410_adc.c,v 1.4 2008/12/11 12:18:17 ecd Exp $
 */

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <errno.h>

#include <x49gp.h>
#include <s3c2410.h>


typedef struct {
	uint32_t			adccon;
	uint32_t			adctsc;
	uint32_t			adcdly;
	uint32_t			adcdat0;
	uint32_t			adcdat1;

	unsigned int		nr_regs;
	s3c2410_offset_t	*regs;
} s3c2410_adc_t;

static int
s3c2410_adc_data_init(s3c2410_adc_t *adc)
{
	s3c2410_offset_t regs[] = {
		S3C2410_OFFSET(ADC, ADCCON, 0x00003fc4, adc->adccon),
		S3C2410_OFFSET(ADC, ADCTSC, 0x00000058, adc->adctsc),
		S3C2410_OFFSET(ADC, ADCDLY, 0x000000ff, adc->adcdly),
		S3C2410_OFFSET(ADC, ADCDAT0, 0x3ff, adc->adcdat0),
		S3C2410_OFFSET(ADC, ADCDAT1, 0x3ff, adc->adcdat1),
	};

	memset(adc, 0, sizeof(s3c2410_adc_t));

	adc->regs = malloc(sizeof(regs));
	if (NULL == adc->regs) {
		fprintf(stderr, "%s:%u: Out of memory\n",
			__FUNCTION__, __LINE__);
		return -ENOMEM;
	}

	memcpy(adc->regs, regs, sizeof(regs));
	adc->nr_regs = sizeof(regs) / sizeof(regs[0]);

	return 0;
}

static uint32_t
s3c2410_adc_read(void *opaque, target_phys_addr_t offset)
{
	s3c2410_adc_t *adc = opaque;
	s3c2410_offset_t *reg;

	if (! S3C2410_OFFSET_OK(adc, offset)) {
		return ~(0);
	}

	reg = S3C2410_OFFSET_ENTRY(adc, offset);

#ifdef DEBUG_S3C2410_ADC
	printf("read  %s [%08x] %s [%08lx] data %08x\n",
		"s3c2410-adc", S3C2410_ADC_BASE,
		reg->name, (unsigned long) offset, *(reg->datap));
#endif

	switch (offset) {
	case S3C2410_ADC_ADCCON:
		*(reg->datap) &= ~(0x0001);
		*(reg->datap) |= 0x8000;
		break;
	default:
		break;
	}

	return *(reg->datap);
}

static void
s3c2410_adc_write(void *opaque, target_phys_addr_t offset, uint32_t data)
{
	s3c2410_adc_t *adc = opaque;
	s3c2410_offset_t *reg;

	if (! S3C2410_OFFSET_OK(adc, offset)) {
		return;
	}

	reg = S3C2410_OFFSET_ENTRY(adc, offset);

#ifdef DEBUG_S3C2410_ADC
	printf("write %s [%08x] %s [%08lx] data %08x\n",
		"s3c2410-adc", S3C2410_ADC_BASE,
		reg->name, (unsigned long) offset, data);
#endif

	*(reg->datap) = data;
}

static int
s3c2410_adc_load(x49gp_module_t *module, GKeyFile *key)
{
	s3c2410_adc_t *adc = module->user_data;
	s3c2410_offset_t *reg;
	int error = 0;
	int i;

#ifdef DEBUG_X49GP_MODULES
	printf("%s: %s:%u\n", module->name, __FUNCTION__, __LINE__);
#endif

	for (i = 0; i < adc->nr_regs; i++) {
		reg = &adc->regs[i];

		if (NULL == reg->name)
			continue;

		if (x49gp_module_get_u32(module, key, reg->name,
					 reg->reset, reg->datap))
			error = -EAGAIN;
	}

	return error;
}

static int
s3c2410_adc_save(x49gp_module_t *module, GKeyFile *key)
{
	s3c2410_adc_t *adc = module->user_data;
	s3c2410_offset_t *reg;
	int i;

#ifdef DEBUG_X49GP_MODULES
	printf("%s: %s:%u\n", module->name, __FUNCTION__, __LINE__);
#endif

	for (i = 0; i < adc->nr_regs; i++) {
		reg = &adc->regs[i];

		if (NULL == reg->name)
			continue;

		x49gp_module_set_u32(module, key, reg->name, *(reg->datap));
	}

	return 0;
}

static int
s3c2410_adc_reset(x49gp_module_t *module, x49gp_reset_t reset)
{
	s3c2410_adc_t *adc = module->user_data;
	s3c2410_offset_t *reg;
	int i;

#ifdef DEBUG_X49GP_MODULES
	printf("%s: %s:%u\n", module->name, __FUNCTION__, __LINE__);
#endif

	for (i = 0; i < adc->nr_regs; i++) {
		reg = &adc->regs[i];

		if (NULL == reg->name)
			continue;

		*(reg->datap) = reg->reset;
	}

	return 0;
}

static CPUReadMemoryFunc *s3c2410_adc_readfn[] =
{
	s3c2410_adc_read,
	s3c2410_adc_read,
	s3c2410_adc_read
};

static CPUWriteMemoryFunc *s3c2410_adc_writefn[] =
{
	s3c2410_adc_write,
	s3c2410_adc_write,
	s3c2410_adc_write
};

static int
s3c2410_adc_init(x49gp_module_t *module)
{
	s3c2410_adc_t *adc;
	int iotype;

#ifdef DEBUG_X49GP_MODULES
	printf("%s: %s:%u\n", module->name, __FUNCTION__, __LINE__);
#endif

	adc = malloc(sizeof(s3c2410_adc_t));
	if (NULL == adc) {
		fprintf(stderr, "%s:%u: Out of memory\n",
			__FUNCTION__, __LINE__);
		return -ENOMEM;
	}
	if (s3c2410_adc_data_init(adc)) {
		free(adc);
		return -ENOMEM;
	}

	module->user_data = adc;

	iotype = cpu_register_io_memory(s3c2410_adc_readfn,
					s3c2410_adc_writefn, adc);
#ifdef DEBUG_S3C2410_ADC
	printf("%s: iotype %08x\n", __FUNCTION__, iotype);
#endif
	cpu_register_physical_memory(S3C2410_ADC_BASE, S3C2410_MAP_SIZE, iotype);

	return 0;
}

static int
s3c2410_adc_exit(x49gp_module_t *module)
{
	s3c2410_adc_t *adc;

#ifdef DEBUG_X49GP_MODULES
	printf("%s: %s:%u\n", module->name, __FUNCTION__, __LINE__);
#endif

	if (module->user_data) {
		adc = module->user_data;
		if (adc->regs)
			free(adc->regs);
		free(adc);
	}

	x49gp_module_unregister(module);
	free(module);

	return 0;
}

int
x49gp_s3c2410_adc_init(x49gp_t *x49gp)
{
	x49gp_module_t *module;

	if (x49gp_module_init(x49gp, "s3c2410-adc",
			      s3c2410_adc_init,
			      s3c2410_adc_exit,
			      s3c2410_adc_reset,
			      s3c2410_adc_load,
			      s3c2410_adc_save,
			      NULL, &module)) {
		return -1;
	}

	return x49gp_module_register(module);
}