// FIXME: Copyright license here
/*------------------------------------------------------------------------------
 *          Headers
 *------------------------------------------------------------------------------*/

#include "board.h"
#include "simtrace.h"
#include "utils.h"
#include "req_ctx.h"
#include "wwan_led.h"
#include "wwan_perst.h"
#include "osmocom/core/timer.h"

uint32_t g_unique_id[4];

/*------------------------------------------------------------------------------
 *         Internal variables
 *------------------------------------------------------------------------------*/
typedef struct {
	/* static initialization, called whether or not the usb config is active */
	void (*configure) (void);
	/* initialization function after the config was selected */
	void (*init) (void);
	/* de-initialization before selecting new config */
	void (*exit) (void);
	/* main loop content for given configuration */
	void (*run) (void);
	/* Interrupt handler for USART1 */
	void (*usart0_irq) (void);
	/* Interrupt handler for USART1 */
	void (*usart1_irq) (void);
} conf_func;

static const conf_func config_func_ptrs[] = {
	/* array slot 0 is empty, usb configs start at 1 */
#ifdef HAVE_SNIFFER
	[CFG_NUM_SNIFF] = {
		.configure = Sniffer_configure,
		.init = Sniffer_init,
		.exit = Sniffer_exit,
		.run = Sniffer_run,
	},
#endif
#ifdef HAVE_CCID
	[CFG_NUM_CCID] = {
		.configure = CCID_configure,
		.init = CCID_init,
		.exit = CCID_exit,
		.run = CCID_run,
	},
#endif
#ifdef HAVE_CARDEM
	[CFG_NUM_PHONE] = {
		.configure = mode_cardemu_configure,
		.init = mode_cardemu_init,
		.exit = mode_cardemu_exit,
		.run = mode_cardemu_run,
		.usart0_irq = mode_cardemu_usart0_irq,
		.usart1_irq = mode_cardemu_usart1_irq,
	},
#endif
#ifdef HAVE_MITM
	[CFG_NUM_MITM] = {
		.configure = MITM_configure,
		.init = MITM_init,
		.exit = MITM_exit,
		.run = MITM_run,
	},
#endif
};

/*------------------------------------------------------------------------------
 *         Internal variables
 *------------------------------------------------------------------------------*/
#if defined(HAVE_SNIFFER)
static volatile enum confNum simtrace_config = CFG_NUM_SNIFF;
#elif defined(HAVE_CARDEM)
static volatile enum confNum simtrace_config = CFG_NUM_PHONE;
#elif defined(HAVE_CCID)
static volatile enum confNum simtrace_config = CFG_NUM_CCID;
#endif

static const Pin pin_hubpwr_override = PIN_PRTPWR_OVERRIDE;
static const Pin pin_hub_rst = {PIO_PA13, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT};
static const Pin pin_1234_detect = {PIO_PA14, PIOA, ID_PIOA, PIO_INPUT, PIO_PULLUP};
static const Pin pin_peer_rst = {PIO_PA0, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT};
static const Pin pin_peer_erase = {PIO_PA11, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT};


/*----------------------------------------------------------------------------
 *       Callbacks
 *----------------------------------------------------------------------------*/

void USBDDriverCallbacks_ConfigurationChanged(uint8_t cfgnum)
{
	TRACE_INFO_WP("cfgChanged%d ", cfgnum);
	simtrace_config = cfgnum;
}

void USART1_IrqHandler(void)
{
	config_func_ptrs[simtrace_config].usart1_irq();
}

void USART0_IrqHandler(void)
{
	config_func_ptrs[simtrace_config].usart0_irq();
}

static int qmod_sam3_is_12(void)
{
	if (PIO_Get(&pin_1234_detect) == 0)
		return 1;
	else
		return 0;
}

const unsigned char __eeprom_bin[256] = {
	0x23, 0x42, 0x17, 0x25, 0x00, 0x00, 0x9b, 0x20, 0x01, 0x00, 0x00, 0x00, 0x32, 0x32, 0x32, 0x32, /* 0x00 - 0x0f */
	0x32, 0x04, 0x09, 0x18, 0x0d, 0x00, 0x73, 0x00, 0x79, 0x00, 0x73, 0x00, 0x6d, 0x00, 0x6f, 0x00, /* 0x10 - 0x1f */
	0x63, 0x00, 0x6f, 0x00, 0x6d, 0x00, 0x20, 0x00, 0x2d, 0x00, 0x20, 0x00, 0x73, 0x00, 0x2e, 0x00, /* 0x20 - 0x2f */
	0x66, 0x00, 0x2e, 0x00, 0x6d, 0x00, 0x2e, 0x00, 0x63, 0x00, 0x2e, 0x00, 0x20, 0x00, 0x47, 0x00, /* 0x30 - 0x3f */
	0x6d, 0x00, 0x62, 0x00, 0x48, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x40 - 0x4f */
	0x00, 0x00, 0x00, 0x00, 0x71, 0x00, 0x75, 0x00, 0x61, 0x00, 0x64, 0x00, 0x20, 0x00, 0x6d, 0x00, /* 0x50 - 0x5f */
	0x6f, 0x00, 0x64, 0x00, 0x65, 0x00, 0x6d, 0x00, 0x20, 0x00, 0x76, 0x00, 0x32, 0x00, 0x00, 0x00, /* 0x60 - 0x6f */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x70 - 0x7f */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x80 - 0x8f */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x90 - 0x9f */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xa0 - 0xaf */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xb0 - 0xbf */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xc0 - 0xcf */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xd0 - 0xdf */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xe0 - 0xef */
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xA0, 0x56, 0x23, 0x71, 0x04, 0x00, /* 0xf0 - 0xff */
};

#include "i2c.h"
static int write_hub_eeprom(void)
{
	const unsigned int __eeprom_bin_len = 256;

	int i;

	/* wait */
	volatile int v;
	/* 440ns per cycle here */
	for (i = 0; i < 1000000; i++) {
		v = 0;
	}

	TRACE_INFO("Writing EEPROM...\r\n");
	/* write the EEPROM once */
	for (i = 0; i < 256; i++) {
		int rc = eeprom_write_byte(0x50, i, __eeprom_bin[i]);
		/* if the result was negative, repeat that write */
		if (rc < 0)
			i--;
	}

	/* then pursue re-reading it again and again */
	TRACE_INFO("Verifying EEPROM...\r\n");
	for (i = 0; i < 256; i++) {
		int byte = eeprom_read_byte(0x50, i);
		TRACE_INFO("0x%02x: %02x\r\n", i, byte);
		if (byte != __eeprom_bin[i])
			TRACE_ERROR("Byte %u is wrong, expected 0x%02x, found 0x%02x\r\n",
					i, __eeprom_bin[i], byte);
	}

	/* FIXME: Release PIN_PRTPWR_OVERRIDE after we know the hub is
	 * again powering us up */

	return 0;
}

/* returns '1' in case we should break any endless loop */
static void check_exec_dbg_cmd(void)
{
	uint32_t addr, val;

	if (!UART_IsRxReady())
		return;

	int ch = UART_GetChar();
	switch (ch) {
	case '?':
		printf("\t?\thelp\r\n");
		printf("\tE\tprogram EEPROM\r\n");
		printf("\tR\treset SAM3\r\n");
		printf("\tO\tEnable PRTPWR_OVERRIDE\r\n");
		printf("\to\tDisable PRTPWR_OVERRIDE\r\n");
		printf("\tH\tRelease HUB RESET (high)\r\n");
		printf("\th\tAssert HUB RESET (low)\r\n");
		printf("\tw\tWrite single byte in EEPROM\r\n");
		printf("\tr\tRead single byte from EEPROM\r\n");
		printf("\tX\tRelease peer SAM3 from reset\r\n");
		printf("\tx\tAssert peer SAM3 reset\r\n");
		printf("\tY\tRelease peer SAM3 ERASE signal\r\n");
		printf("\ty\tAssert peer SAM3 ERASE signal\r\n");
		printf("\tU\tProceed to USB Initialization\r\n");
		printf("\t1\tGenerate 1ms reset pulse on WWAN1\r\n");
		printf("\t2\tGenerate 1ms reset pulse on WWAN2\r\n");
		break;
	case 'E':
		write_hub_eeprom();
		break;
	case 'R':
		printf("Asking NVIC to reset us\r\n");
		NVIC_SystemReset();
		break;
	case 'O':
		printf("Setting PRTPWR_OVERRIDE\r\n");
		PIO_Set(&pin_hubpwr_override);
		break;
	case 'o':
		printf("Clearing PRTPWR_OVERRIDE\r\n");
		PIO_Clear(&pin_hubpwr_override);
		break;
	case 'H':
		printf("Clearing _HUB_RESET -> HUB_RESET high (inactive)\r\n");
		PIO_Clear(&pin_hub_rst);
		break;
	case 'h':
		/* high level drives transistor -> HUB_RESET low */
		printf("Asserting _HUB_RESET -> HUB_RESET low (active)\r\n");
		PIO_Set(&pin_hub_rst);
		break;
	case 'w':
		if (PIO_GetOutputDataStatus(&pin_hub_rst) == 0)
			printf("WARNING: attempting EEPROM access while HUB not in reset\r\n");
		printf("Please enter EEPROM offset:\r\n");
		UART_GetIntegerMinMax(&addr, 0, 255);
		printf("Please enter EEPROM value:\r\n");
		UART_GetIntegerMinMax(&val, 0, 255);
		printf("Writing value 0x%02x to EEPROM offset 0x%02x\r\n", val, addr);
		eeprom_write_byte(0x50, addr, val);
		break;
	case 'r':
		printf("Please enter EEPROM offset:\r\n");
		UART_GetIntegerMinMax(&addr, 0, 255);
		printf("EEPROM[0x%02x] = 0x%02x\r\n", addr, eeprom_read_byte(0x50, addr));
		break;
	case 'X':
		printf("Clearing _SIMTRACExx_RST -> SIMTRACExx_RST high (inactive)\r\n");
		PIO_Clear(&pin_peer_rst);
		break;
	case 'x':
		printf("Setting _SIMTRACExx_RST -> SIMTRACExx_RST low (active)\r\n");
		PIO_Set(&pin_peer_rst);
		break;
	case 'Y':
		printf("Clearing SIMTRACExx_ERASE (inactive)\r\n");
		PIO_Clear(&pin_peer_erase);
		break;
	case 'y':
		printf("Seetting SIMTRACExx_ERASE (active)\r\n");
		PIO_Set(&pin_peer_erase);
		break;
	case '1':
		printf("Resetting Modem 1 (of this SAM3)\r\n");
		wwan_perst_do_reset(1);
		break;
	case '2':
		printf("Resetting Modem 2 (of this SAM3)\r\n");
		wwan_perst_do_reset(2);
		break;
	default:
		printf("Unknown command '%c'\r\n", ch);
		break;
	}
}

/*------------------------------------------------------------------------------
 *        Main
 *------------------------------------------------------------------------------*/
#define MAX_USB_ITER BOARD_MCK/72	// This should be around a second
extern int main(void)
{
	uint8_t isUsbConnected = 0;
	enum confNum last_simtrace_config = simtrace_config;
	unsigned int i = 0;

	LED_Configure(LED_NUM_RED);
	LED_Configure(LED_NUM_GREEN);
	LED_Set(LED_NUM_RED);

	/* Disable watchdog */
	WDT_Disable(WDT);

	req_ctx_init();

	PIO_InitializeInterrupts(0);

	wwan_led_init();
	wwan_perst_init();

	EEFC_ReadUniqueID(g_unique_id);

        printf("\r\n\r\n"
		"=============================================================================\r\n"
		"SIMtrace2 firmware " GIT_VERSION " (C) 2010-2016 by Harald Welte\r\n"
		"=============================================================================\r\n");

	TRACE_INFO("Serial Nr. %08x-%08x-%08x-%08x\r\n",
		   g_unique_id[0], g_unique_id[1],
		   g_unique_id[2], g_unique_id[3]);

	/* set PIN_PRTPWR_OVERRIDE to output-low to avoid the internal
	 * pull-up on the input to keep SIMTRACE12 alive */
	PIO_Configure(&pin_hubpwr_override, 1);
	PIO_Configure(&pin_hub_rst, 1);
	PIO_Configure(&pin_1234_detect, 1);
	PIO_Configure(&pin_peer_rst, 1);
	PIO_Configure(&pin_peer_erase, 1);
	i2c_pin_init();

	if (qmod_sam3_is_12()) {
		TRACE_INFO("Detected Quad-Modem ST12\r\n");
	} else {
		TRACE_INFO("Detected Quad-Modem ST34\r\n");
	}

	TRACE_INFO("USB init...\r\n");
	SIMtrace_USB_Initialize();

	while (USBD_GetState() < USBD_STATE_CONFIGURED) {
		check_exec_dbg_cmd();
#if 0
		if (i >= MAX_USB_ITER * 3) {
			TRACE_ERROR("Resetting board (USB could "
				    "not be configured)\r\n");
			NVIC_SystemReset();
		}
#endif
		i++;
	}

	TRACE_INFO("Releasing ST12_PRTPWR_OVERRIDE\r\n");
	PIO_Clear(&pin_hubpwr_override);

	TRACE_INFO("calling configure of all configurations...\r\n");
	for (i = 1; i < sizeof(config_func_ptrs) / sizeof(config_func_ptrs[0]);
	     ++i) {
		if (config_func_ptrs[i].configure)
			config_func_ptrs[i].configure();
	}

	TRACE_INFO("calling init of config %u...\r\n", simtrace_config);
	config_func_ptrs[simtrace_config].init();
	last_simtrace_config = simtrace_config;

	TRACE_INFO("entering main loop...\r\n");
	while (1) {
#if TRACE_LEVEL >= TRACE_LEVEL_DEBUG
		const char rotor[] = { '-', '\\', '|', '/' };
		putchar('\b');
		putchar(rotor[i++ % ARRAY_SIZE(rotor)]);
#endif
		check_exec_dbg_cmd();

		if (USBD_GetState() < USBD_STATE_CONFIGURED) {

			if (isUsbConnected) {
				isUsbConnected = 0;
			}
		} else if (isUsbConnected == 0) {
			TRACE_INFO("USB is now configured\r\n");
			LED_Set(LED_NUM_GREEN);
			LED_Clear(LED_NUM_RED);

			isUsbConnected = 1;
		}
		if (last_simtrace_config != simtrace_config) {
			TRACE_INFO("USB config chg %u -> %u\r\n",
				   last_simtrace_config, simtrace_config);
			config_func_ptrs[last_simtrace_config].exit();
			config_func_ptrs[simtrace_config].init();
			last_simtrace_config = simtrace_config;
		} else {
			config_func_ptrs[simtrace_config].run();
		}
	}
}