/*
 * Copyright 2012 Jared Boone <jared@sharebrained.com>
 * Copyright 2013 Benjamin Vernoux <titanmkd@gmail.com>
 *
 * This file is part of HackRF.
 *
 * 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)
 * any later version.
 *
 * 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include <libopencm3/lpc43xx/gpio.h>
#include <libopencm3/lpc43xx/scu.h>
#include <libopencm3/lpc43xx/sgpio.h>

#include <hackrf_core.h>

#include <sgpio.h>

void sgpio_configure_pin_functions() {
	scu_pinmux(SCU_PINMUX_SGPIO0, SCU_GPIO_FAST | SCU_CONF_FUNCTION3);
	scu_pinmux(SCU_PINMUX_SGPIO1, SCU_GPIO_FAST | SCU_CONF_FUNCTION3);
	scu_pinmux(SCU_PINMUX_SGPIO2, SCU_GPIO_FAST | SCU_CONF_FUNCTION2);
	scu_pinmux(SCU_PINMUX_SGPIO3, SCU_GPIO_FAST | SCU_CONF_FUNCTION2);
	scu_pinmux(SCU_PINMUX_SGPIO4, SCU_GPIO_FAST | SCU_CONF_FUNCTION2);
	scu_pinmux(SCU_PINMUX_SGPIO5, SCU_GPIO_FAST | SCU_CONF_FUNCTION2);
	scu_pinmux(SCU_PINMUX_SGPIO6, SCU_GPIO_FAST | SCU_CONF_FUNCTION0);
	scu_pinmux(SCU_PINMUX_SGPIO7, SCU_GPIO_FAST | SCU_CONF_FUNCTION6);
	scu_pinmux(SCU_PINMUX_SGPIO8, SCU_GPIO_FAST | SCU_CONF_FUNCTION6);
	scu_pinmux(SCU_PINMUX_SGPIO9, SCU_GPIO_FAST | SCU_CONF_FUNCTION7);
	scu_pinmux(SCU_PINMUX_SGPIO10, SCU_GPIO_FAST | SCU_CONF_FUNCTION6);
	scu_pinmux(SCU_PINMUX_SGPIO11, SCU_GPIO_FAST | SCU_CONF_FUNCTION6);
	scu_pinmux(SCU_PINMUX_SGPIO12, SCU_GPIO_FAST | SCU_CONF_FUNCTION6);
	scu_pinmux(SCU_PINMUX_SGPIO13, SCU_GPIO_FAST | SCU_CONF_FUNCTION4);	/* GPIO5[12] */
	scu_pinmux(SCU_PINMUX_SGPIO14, SCU_GPIO_FAST | SCU_CONF_FUNCTION4);	/* GPIO5[13] */
	scu_pinmux(SCU_PINMUX_SGPIO15, SCU_GPIO_FAST | SCU_CONF_FUNCTION4);	/* GPIO5[14] */

	sgpio_cpld_stream_rx_set_decimation(0);

	GPIO_DIR(GPIO5) |= GPIOPIN14 | GPIOPIN13 | GPIOPIN12;
}


void sgpio_test_interface() {
	const uint_fast8_t host_clock_sgpio_pin = 8; // Input
	const uint_fast8_t host_capture_sgpio_pin = 9; // Input
	const uint_fast8_t host_disable_sgpio_pin = 10; // Output
	const uint_fast8_t host_direction_sgpio_pin = 11; // Output

	SGPIO_GPIO_OENREG = 0; // All inputs for the moment.

	// Disable all counters during configuration
	SGPIO_CTRL_ENABLE = 0;

	// Make all SGPIO controlled by SGPIO's "GPIO" registers
	for (uint_fast8_t i = 0; i < 16; i++) {
		SGPIO_OUT_MUX_CFG(i) =
			  SGPIO_OUT_MUX_CFG_P_OE_CFG(0)
			| SGPIO_OUT_MUX_CFG_P_OUT_CFG(4);
	}

	// Set SGPIO output values.
	SGPIO_GPIO_OUTREG =
		  (1L << host_direction_sgpio_pin)
		| (1L << host_disable_sgpio_pin);

	// Enable SGPIO pin outputs.
	SGPIO_GPIO_OENREG =
		  (1L << host_direction_sgpio_pin)
		| (1L << host_disable_sgpio_pin)
		| (0L << host_capture_sgpio_pin)
		| (0L << host_clock_sgpio_pin)
		| (0xFF << 0);

	// Configure SGPIO slices.

	// Enable codec data stream.
	SGPIO_GPIO_OUTREG &= ~(1L << host_disable_sgpio_pin);

	while (1) {
		for (uint_fast8_t i = 0; i < 8; i++) {
			SGPIO_GPIO_OUTREG ^= (1L << i);
		}
	}
}


/*
 SGPIO0 to 7 = DAC/ADC data bits 0 to 7 (Nota: DAC is 10bits but only bit9 to bit2 are used bit1 & 0 are forced to 0 by CPLD)
 ADC=> CLK x 2=CLKx2 with CLKx2(0)rising=D0Q, CLKx2(1)rising=D1I (corresponds to CLK(0)falling+tD0Q=>D0Q, CLK(1)rising+tDOI=>D1I, CLK(1)falling+tD0Q=>D1Q, CLK(1)rising+tDOI=>D2I ...)
 tDOI(CLK Rise to I-ADC Channel-I Output Data Valid)=7.4 to 9ns, tD0Q(CLK Fall to Q-ADC Channel-Q Output Data Valid)=6.9 to 9ns
 DAC=> CLK x 2=CLKx2 with CLKx2(0)rising=Q:N-2, CLKx2(1)rising=I:N-1(corresponds to CLK(0)rising=>Q:N-2, CLK(0)falling I:N-1, CLK(1)rising=>Q:N-1, CLK(1)falling I:N ...)
 tDSI(I-DAC Data to CLK Fall Setup Time)=min 10ns, tDSQ(Q-DAC Data to CLK Rise Setup Time)=min 10ns
 
 SGPIO8 Clock Input (External Clock)
 SGPIO9 Capture Input (Capture/ChipSelect, 1=Enable Capture, 0=Disable capture)
 SGPIO10 Disable Output (1/High=Disable codec data stream, 0/Low=Enable codec data stream)
 SGPIO11 Direction Output (1/High=TX mode LPC43xx=>CPLD=>DAC, 0/Low=RX mode LPC43xx<=CPLD<=ADC)
*/
void sgpio_configure(
	const sgpio_direction_t direction,
	const bool multi_slice
) {
	// Disable all counters during configuration
	SGPIO_CTRL_ENABLE = 0;

    // Set SGPIO output values.
	const uint_fast8_t cpld_direction =
		(direction == SGPIO_DIRECTION_TX) ? 1 : 0;
    SGPIO_GPIO_OUTREG =
          (cpld_direction << 11) /* 1=Output SGPIO11 High(TX mode), 0=Output SGPIO11 Low(RX mode)*/
        | (1L << 10)	// disable codec data stream during configuration (Output SGPIO10 High)
		;

	// Enable SGPIO pin outputs.
	const uint_fast16_t sgpio_gpio_data_direction =
		(direction == SGPIO_DIRECTION_TX)
		? (0xFF << 0)
		: (0x00 << 0);
	SGPIO_GPIO_OENREG =
		  (1L << 11)	// direction output SGPIO11 active 
	    | (1L << 10)	// disable output SGPIO10 active
	    | (0L <<  9)	// capture input SGPIO9 (output i is tri-stated)
	    | (0L <<  8)	// clock input SGPIO8 (output i is tri-stated)
        | sgpio_gpio_data_direction // 0xFF=Output all SGPIO High(TX mode), 0x00=Output all SPGIO Low(RX mode)
		;

	SGPIO_OUT_MUX_CFG( 8) =		// SGPIO8: Input: clock
		  SGPIO_OUT_MUX_CFG_P_OE_CFG(0) /* 0x0 gpio_oe (state set by GPIO_OEREG) */
		| SGPIO_OUT_MUX_CFG_P_OUT_CFG(0) /* 0x0 dout_doutm1 (1-bit mode) */ 
		;
	SGPIO_OUT_MUX_CFG( 9) =		// SGPIO9: Input: qualifier
		  SGPIO_OUT_MUX_CFG_P_OE_CFG(0) /* 0x0 gpio_oe (state set by GPIO_OEREG) */
		| SGPIO_OUT_MUX_CFG_P_OUT_CFG(0) /* 0x0 dout_doutm1 (1-bit mode) */
		;
    SGPIO_OUT_MUX_CFG(10) =		// GPIO10: Output: disable
		  SGPIO_OUT_MUX_CFG_P_OE_CFG(0) /* 0x0 gpio_oe (state set by GPIO_OEREG) */
		| SGPIO_OUT_MUX_CFG_P_OUT_CFG(4) /* 0x4=gpio_out (level set by GPIO_OUTREG) */
		;
    SGPIO_OUT_MUX_CFG(11) =		// GPIO11: Output: direction
		  SGPIO_OUT_MUX_CFG_P_OE_CFG(0) /* 0x0 gpio_oe (state set by GPIO_OEREG) */
		| SGPIO_OUT_MUX_CFG_P_OUT_CFG(4) /* 0x4=gpio_out (level set by GPIO_OUTREG) */
		;

	const uint_fast8_t output_multiplexing_mode =
		multi_slice ? 11 : 9;
	/* SGPIO0 to SGPIO7 */
	for(uint_fast8_t i=0; i<8; i++) {
		// SGPIO pin 0 outputs slice A bit "i".
		SGPIO_OUT_MUX_CFG(i) =
		      SGPIO_OUT_MUX_CFG_P_OE_CFG(0)
		    | SGPIO_OUT_MUX_CFG_P_OUT_CFG(output_multiplexing_mode) /* 11/0xB=dout_doutm8c (8-bit mode 8c)(multislice L0/7, N0/7), 9=dout_doutm8a (8-bit mode 8a)(A0/7,B0/7) */
			;
	}

	const uint_fast8_t slice_indices[] = {
		SGPIO_SLICE_A,
		SGPIO_SLICE_I,
		SGPIO_SLICE_E,
		SGPIO_SLICE_J,
		SGPIO_SLICE_C,
		SGPIO_SLICE_K,
		SGPIO_SLICE_F,
		SGPIO_SLICE_L,
	};
	
	const uint_fast8_t pos = multi_slice ? 0x1f : 0x03;
	const bool single_slice = !multi_slice;
	const uint_fast8_t slice_count = multi_slice ? 8 : 1;
	
	uint32_t slice_enable_mask = 0;
	/* Configure Slice A, I, E, J, C, K, F, L (multi_slice mode) */
	for(uint_fast8_t i=0; i<slice_count; i++)
	{
		const uint_fast8_t slice_index = slice_indices[i];
		const bool input_slice = (i == 0) && (direction != SGPIO_DIRECTION_TX); /* Only for slice0/A and RX mode set input_slice to 1 */
		const uint_fast8_t concat_order = (input_slice || single_slice) ? 0 : 3; /* 0x0=Self-loop(slice0/A RX mode), 0x3=8 slices */
		const uint_fast8_t concat_enable = (input_slice || single_slice) ? 0 : 1; /* 0x0=External data pin(slice0/A RX mode), 0x1=Concatenate data */
		const uint_fast8_t clk_capture_mode = (direction == SGPIO_DIRECTION_TX) ? 0 : 1;
		
		SGPIO_MUX_CFG(slice_index) =
		      SGPIO_MUX_CFG_CONCAT_ORDER(concat_order)
		    | SGPIO_MUX_CFG_CONCAT_ENABLE(concat_enable)
		    | SGPIO_MUX_CFG_QUALIFIER_SLICE_MODE(0) /* Select qualifier slice A(0x0) */
		    | SGPIO_MUX_CFG_QUALIFIER_PIN_MODE(1) /* Select qualifier pin SGPIO9(0x1) */
		    | SGPIO_MUX_CFG_QUALIFIER_MODE(3) /* External SGPIO */
		    | SGPIO_MUX_CFG_CLK_SOURCE_SLICE_MODE(0) /* Select clock source slice D(0x0) */
		    | SGPIO_MUX_CFG_CLK_SOURCE_PIN_MODE(0) /* Source Clock Pin 0x0 = SGPIO8 */
			| SGPIO_MUX_CFG_EXT_CLK_ENABLE(1) /* External clock signal(pin) selected */
			;

		SGPIO_SLICE_MUX_CFG(slice_index) =
		      SGPIO_SLICE_MUX_CFG_INV_QUALIFIER(0) /* 0x0=Use normal qualifier. */
		    | SGPIO_SLICE_MUX_CFG_PARALLEL_MODE(3) /* 0x3=Shift 1 byte(8bits) per clock. */
		    | SGPIO_SLICE_MUX_CFG_DATA_CAPTURE_MODE(0) /* 0x0=Detect rising edge. (Condition for input bit match interrupt) */
		    | SGPIO_SLICE_MUX_CFG_INV_OUT_CLK(0) /* 0x0=Normal clock. */
		    | SGPIO_SLICE_MUX_CFG_CLKGEN_MODE(1) /* 0x1=Use external clock from a pin or other slice */
		    | SGPIO_SLICE_MUX_CFG_CLK_CAPTURE_MODE(clk_capture_mode) /* 0x0=Use rising clock edge, 0x1=Use falling clock edge */
		    | SGPIO_SLICE_MUX_CFG_MATCH_MODE(0) /* 0x0=Do not match data */
			;

		SGPIO_PRESET(slice_index) = 0;			// External clock, don't care
		SGPIO_COUNT(slice_index) = 0;				// External clock, don't care
		SGPIO_POS(slice_index) =
			  SGPIO_POS_POS_RESET(pos)
			| SGPIO_POS_POS(pos)
			;
		SGPIO_REG(slice_index) = 0x00000000;     // Primary output data register
		SGPIO_REG_SS(slice_index) = 0x00000000;  // Shadow output data register
		
		slice_enable_mask |= (1 << slice_index);
	}
	
	// Start SGPIO operation by enabling slice clocks.
	SGPIO_CTRL_ENABLE = slice_enable_mask;
}

void sgpio_cpld_stream_enable() {
	// Enable codec data stream.
	SGPIO_GPIO_OUTREG &= ~(1L << 10); /* SGPIO10 */
}

void sgpio_cpld_stream_disable() {
	// Disable codec data stream.
	SGPIO_GPIO_OUTREG |= (1L << 10); /* SGPIO10 */
}

bool sgpio_cpld_stream_is_enabled() {
	return (SGPIO_GPIO_OUTREG & (1L << 10)) == 0; /* SGPIO10 */
}

bool sgpio_cpld_stream_rx_set_decimation(const uint_fast8_t skip_n) {
	/* CPLD interface is three bits, SGPIO[15:13]:
	 * 111: decimate by 1 (skip_n=0, skip no samples)
	 * 110: decimate by 2 (skip_n=1, skip every other sample)
	 * 101: decimate by 3 (skip_n=2, skip two of three samples)
	 * ...
	 * 000: decimate by 8 (skip_n=7, skip seven of eight samples)
	 */
	GPIO_SET(GPIO5) = GPIOPIN14 | GPIOPIN13 | GPIOPIN12;
	GPIO_CLR(GPIO5) = (skip_n & 7) << 12;

	return (skip_n < 8);
}