/* SPDX-License-Identifier: GPL-2.0 */

/***************************************************************************
 *    copyright            : (C) 2002, 2005 by Frank Mori Hess             *
 ***************************************************************************/

#include "tms9914.h"
#include "gpibP.h"

enum hp_82341_hardware_version {
	HW_VERSION_UNKNOWN,
	HW_VERSION_82341C,
	HW_VERSION_82341D,
};

// struct which defines private_data for board
struct hp_82341_priv {
	struct tms9914_priv tms9914_priv;
	unsigned int irq;
	unsigned short config_control_bits;
	unsigned short mode_control_bits;
	unsigned short event_status_bits;
	struct pnp_dev *pnp_dev;
	unsigned long iobase[4];
	unsigned long io_region_offset;
	enum hp_82341_hardware_version hw_version;
};

static const int hp_82341_region_iosize = 0x8;
static const int hp_82341_num_io_regions = 4;
static const int hp_82341_fifo_size = 0xffe;
static const int hp_82341c_firmware_length = 5764;
static const int hp_82341d_firmware_length = 5302;

// hp 82341 register offsets
enum hp_82341_region_0_registers {
	CONFIG_CONTROL_STATUS_REG = 0x0,
	MODE_CONTROL_STATUS_REG = 0x1,
	MONITOR_REG = 0x2,	// after initialization
	XILINX_DATA_REG = 0x2,	// before initialization, write only
	INTERRUPT_ENABLE_REG = 0x3,
	EVENT_STATUS_REG = 0x4,
	EVENT_ENABLE_REG = 0x5,
	STREAM_STATUS_REG = 0x7,
};

enum hp_82341_region_1_registers {
	ID0_REG = 0x2,
	ID1_REG = 0x3,
	TRANSFER_COUNT_LOW_REG = 0x4,
	TRANSFER_COUNT_MID_REG = 0x5,
	TRANSFER_COUNT_HIGH_REG = 0x6,
};

enum hp_82341_region_3_registers {
	BUFFER_PORT_LOW_REG = 0x0,
	BUFFER_PORT_HIGH_REG = 0x1,
	ID2_REG = 0x2,
	ID3_REG = 0x3,
	BUFFER_FLUSH_REG = 0x4,
	BUFFER_CONTROL_REG = 0x7
};

enum config_control_status_bits {
	IRQ_SELECT_MASK = 0x7,
	DMA_CONFIG_MASK = 0x18,
	ENABLE_DMA_CONFIG_BIT = 0x20,
	XILINX_READY_BIT = 0x40,	// read only
	DONE_PGL_BIT = 0x80
};

static inline unsigned int IRQ_SELECT_BITS(int irq)
{
	switch (irq) {
	case 3:
		return 0x3;
	case 5:
		return 0x2;
	case 7:
		return 0x1;
	case 9:
		return 0x0;
	case 10:
		return 0x7;
	case 11:
		return 0x6;
	case 12:
		return 0x5;
	case 15:
		return 0x4;
	default:
		return 0x0;
	}
};

enum mode_control_status_bits {
	SLOT8_BIT = 0x1,		// read only
	ACTIVE_CONTROLLER_BIT = 0x2,	// read only
	ENABLE_DMA_BIT = 0x4,
	SYSTEM_CONTROLLER_BIT = 0x8,
	MONITOR_BIT = 0x10,
	ENABLE_IRQ_CONFIG_BIT = 0x20,
	ENABLE_TI_STREAM_BIT = 0x40
};

enum monitor_bits {
	MONITOR_INTERRUPT_PENDING_BIT = 0x1,	// read only
	MONITOR_CLEAR_HOLDOFF_BIT = 0x2,	// write only
	MONITOR_PPOLL_BIT = 0x4,		// write clear
	MONITOR_SRQ_BIT = 0x8,			// write clear
	MONITOR_IFC_BIT = 0x10,			// write clear
	MONITOR_REN_BIT = 0x20,			// write clear
	MONITOR_END_BIT = 0x40,			// write clear
	MONITOR_DAV_BIT = 0x80			// write clear
};

enum interrupt_enable_bits {
	ENABLE_TI_INTERRUPT_BIT = 0x1,
	ENABLE_POINTERS_EQUAL_INTERRUPT_BIT = 0x4,
	ENABLE_BUFFER_END_INTERRUPT_BIT = 0x10,
	ENABLE_TERMINAL_COUNT_INTERRUPT_BIT = 0x20,
	ENABLE_DMA_TERMINAL_COUNT_INTERRUPT_BIT = 0x80,
};

enum event_status_bits {
	TI_INTERRUPT_EVENT_BIT = 0x1,		// write clear
	INTERRUPT_PENDING_EVENT_BIT = 0x2,	// read only
	POINTERS_EQUAL_EVENT_BIT = 0x4,		// write clear
	BUFFER_END_EVENT_BIT = 0x10,		// write clear
	TERMINAL_COUNT_EVENT_BIT = 0x20,	// write clear
	DMA_TERMINAL_COUNT_EVENT_BIT = 0x80,	// write clear
};

enum event_enable_bits {
	ENABLE_TI_INTERRUPT_EVENT_BIT = 0x1,		// write clear
	ENABLE_POINTERS_EQUAL_EVENT_BIT = 0x4,		// write clear
	ENABLE_BUFFER_END_EVENT_BIT = 0x10,		// write clear
	ENABLE_TERMINAL_COUNT_EVENT_BIT = 0x20,		// write clear
	ENABLE_DMA_TERMINAL_COUNT_EVENT_BIT = 0x80,	// write clear
};

enum stream_status_bits {
	HALTED_STATUS_BIT = 0x1,	// read
	RESTART_STREAM_BIT = 0x1	// write
};

enum buffer_control_bits {
	DIRECTION_GPIB_TO_HOST_BIT = 0x20,	// transfer direction (set for gpib to host)
	ENABLE_TI_BUFFER_BIT = 0x40,		// enable fifo
	FAST_WR_EN_BIT = 0x80,			// 350 ns t1 delay?
};

// registers accessible through isapnp chip on 82341d
enum hp_82341d_pnp_registers {
	PIO_DATA_REG = 0x20,		// read/write pio data lines
	PIO_DIRECTION_REG = 0x21,	// set pio data line directions (set for input)
};

enum hp_82341d_pnp_pio_bits {
	HP_82341D_XILINX_READY_BIT = 0x1,
	HP_82341D_XILINX_DONE_BIT = 0x2,
	// use register layout compatible with C and older versions instead of 32 contiguous ioports
	HP_82341D_LEGACY_MODE_BIT = 0x4,
	HP_82341D_NOT_PROG_BIT = 0x8,	// clear to reinitialize xilinx
};