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

  /*

   * Copyright (C) 1999-2002	Andre Hedrick <andre@linux-ide.org>

   * Copyright (C) 2007		MontaVista Software, Inc. <source@mvista.com>

   *
   */
  
  #include <linux/module.h>

  #include <linux/types.h>
  #include <linux/pci.h>

  #include <linux/ide.h>
  #include <linux/init.h>
  
  #include <asm/io.h>

  #define DRV_NAME "aec62xx"

  struct chipset_bus_clock_list_entry {
  	u8 xfer_speed;
  	u8 chipset_settings;
  	u8 ultra_settings;
  };

  static const struct chipset_bus_clock_list_entry aec6xxx_33_base [] = {

  	{	XFER_UDMA_6,	0x31,	0x07	},
  	{	XFER_UDMA_5,	0x31,	0x06	},
  	{	XFER_UDMA_4,	0x31,	0x05	},
  	{	XFER_UDMA_3,	0x31,	0x04	},
  	{	XFER_UDMA_2,	0x31,	0x03	},
  	{	XFER_UDMA_1,	0x31,	0x02	},
  	{	XFER_UDMA_0,	0x31,	0x01	},
  
  	{	XFER_MW_DMA_2,	0x31,	0x00	},
  	{	XFER_MW_DMA_1,	0x31,	0x00	},
  	{	XFER_MW_DMA_0,	0x0a,	0x00	},
  	{	XFER_PIO_4,	0x31,	0x00	},
  	{	XFER_PIO_3,	0x33,	0x00	},
  	{	XFER_PIO_2,	0x08,	0x00	},
  	{	XFER_PIO_1,	0x0a,	0x00	},
  	{	XFER_PIO_0,	0x00,	0x00	},
  	{	0,		0x00,	0x00	}
  };

  static const struct chipset_bus_clock_list_entry aec6xxx_34_base [] = {

  	{	XFER_UDMA_6,	0x41,	0x06	},
  	{	XFER_UDMA_5,	0x41,	0x05	},
  	{	XFER_UDMA_4,	0x41,	0x04	},
  	{	XFER_UDMA_3,	0x41,	0x03	},
  	{	XFER_UDMA_2,	0x41,	0x02	},
  	{	XFER_UDMA_1,	0x41,	0x01	},
  	{	XFER_UDMA_0,	0x41,	0x01	},
  
  	{	XFER_MW_DMA_2,	0x41,	0x00	},
  	{	XFER_MW_DMA_1,	0x42,	0x00	},
  	{	XFER_MW_DMA_0,	0x7a,	0x00	},
  	{	XFER_PIO_4,	0x41,	0x00	},
  	{	XFER_PIO_3,	0x43,	0x00	},
  	{	XFER_PIO_2,	0x78,	0x00	},
  	{	XFER_PIO_1,	0x7a,	0x00	},
  	{	XFER_PIO_0,	0x70,	0x00	},
  	{	0,		0x00,	0x00	}
  };

  /*
   * TO DO: active tuning and correction of cards without a bios.
   */
  static u8 pci_bus_clock_list (u8 speed, struct chipset_bus_clock_list_entry * chipset_table)
  {
  	for ( ; chipset_table->xfer_speed ; chipset_table++)
  		if (chipset_table->xfer_speed == speed) {
  			return chipset_table->chipset_settings;
  		}
  	return chipset_table->chipset_settings;
  }
  
  static u8 pci_bus_clock_list_ultra (u8 speed, struct chipset_bus_clock_list_entry * chipset_table)
  {
  	for ( ; chipset_table->xfer_speed ; chipset_table++)
  		if (chipset_table->xfer_speed == speed) {
  			return chipset_table->ultra_settings;
  		}
  	return chipset_table->ultra_settings;
  }

  static void aec6210_set_mode(ide_hwif_t *hwif, ide_drive_t *drive)

  {

  	struct pci_dev *dev	= to_pci_dev(hwif->dev);

  	struct ide_host *host	= pci_get_drvdata(dev);
  	struct chipset_bus_clock_list_entry *bus_clock = host->host_priv;

  	u16 d_conf		= 0;

  	u8 ultra = 0, ultra_conf = 0;
  	u8 tmp0 = 0, tmp1 = 0, tmp2 = 0;

  	const u8 speed = drive->dma_mode;

  	unsigned long flags;
  
  	local_irq_save(flags);
  	/* 0x40|(2*drive->dn): Active, 0x41|(2*drive->dn): Recovery */
  	pci_read_config_word(dev, 0x40|(2*drive->dn), &d_conf);

  	tmp0 = pci_bus_clock_list(speed, bus_clock);

  	d_conf = ((tmp0 & 0xf0) << 4) | (tmp0 & 0xf);
  	pci_write_config_word(dev, 0x40|(2*drive->dn), d_conf);
  
  	tmp1 = 0x00;
  	tmp2 = 0x00;
  	pci_read_config_byte(dev, 0x54, &ultra);
  	tmp1 = ((0x00 << (2*drive->dn)) | (ultra & ~(3 << (2*drive->dn))));

  	ultra_conf = pci_bus_clock_list_ultra(speed, bus_clock);

  	tmp2 = ((ultra_conf << (2*drive->dn)) | (tmp1 & ~(3 << (2*drive->dn))));
  	pci_write_config_byte(dev, 0x54, tmp2);
  	local_irq_restore(flags);

  }

  static void aec6260_set_mode(ide_hwif_t *hwif, ide_drive_t *drive)

  {

  	struct pci_dev *dev	= to_pci_dev(hwif->dev);

  	struct ide_host *host	= pci_get_drvdata(dev);
  	struct chipset_bus_clock_list_entry *bus_clock = host->host_priv;

  	u8 unit			= drive->dn & 1;

  	u8 tmp1 = 0, tmp2 = 0;
  	u8 ultra = 0, drive_conf = 0, ultra_conf = 0;

  	const u8 speed = drive->dma_mode;

  	unsigned long flags;
  
  	local_irq_save(flags);
  	/* high 4-bits: Active, low 4-bits: Recovery */
  	pci_read_config_byte(dev, 0x40|drive->dn, &drive_conf);

  	drive_conf = pci_bus_clock_list(speed, bus_clock);

  	pci_write_config_byte(dev, 0x40|drive->dn, drive_conf);
  
  	pci_read_config_byte(dev, (0x44|hwif->channel), &ultra);
  	tmp1 = ((0x00 << (4*unit)) | (ultra & ~(7 << (4*unit))));

  	ultra_conf = pci_bus_clock_list_ultra(speed, bus_clock);

  	tmp2 = ((ultra_conf << (4*unit)) | (tmp1 & ~(7 << (4*unit))));
  	pci_write_config_byte(dev, (0x44|hwif->channel), tmp2);
  	local_irq_restore(flags);

  }

  static void aec_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)

  {

  	drive->dma_mode = drive->pio_mode;

  	hwif->port_ops->set_dma_mode(hwif, drive);

  }

  static int init_chipset_aec62xx(struct pci_dev *dev)

  {

  	/* These are necessary to get AEC6280 Macintosh cards to work */
  	if ((dev->device == PCI_DEVICE_ID_ARTOP_ATP865) ||
  	    (dev->device == PCI_DEVICE_ID_ARTOP_ATP865R)) {
  		u8 reg49h = 0, reg4ah = 0;
  		/* Clear reset and test bits.  */
  		pci_read_config_byte(dev, 0x49, &reg49h);
  		pci_write_config_byte(dev, 0x49, reg49h & ~0x30);
  		/* Enable chip interrupt output.  */
  		pci_read_config_byte(dev, 0x4a, &reg4ah);
  		pci_write_config_byte(dev, 0x4a, reg4ah & ~0x01);
  		/* Enable burst mode. */
  		pci_read_config_byte(dev, 0x4a, &reg4ah);
  		pci_write_config_byte(dev, 0x4a, reg4ah | 0x80);
  	}

  	return 0;

  }

  static u8 atp86x_cable_detect(ide_hwif_t *hwif)

  {
  	struct pci_dev *dev = to_pci_dev(hwif->dev);
  	u8 ata66 = 0, mask = hwif->channel ? 0x02 : 0x01;
  
  	pci_read_config_byte(dev, 0x49, &ata66);
  
  	return (ata66 & mask) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
  }

  static const struct ide_port_ops atp850_port_ops = {
  	.set_pio_mode		= aec_set_pio_mode,
  	.set_dma_mode		= aec6210_set_mode,
  };

  static const struct ide_port_ops atp86x_port_ops = {
  	.set_pio_mode		= aec_set_pio_mode,
  	.set_dma_mode		= aec6260_set_mode,
  	.cable_detect		= atp86x_cable_detect,
  };

  static const struct ide_port_info aec62xx_chipsets[] = {

  	{	/* 0: AEC6210 */
  		.name		= DRV_NAME,

  		.init_chipset	= init_chipset_aec62xx,

  		.enablebits	= {{0x4a,0x02,0x02}, {0x4a,0x04,0x04}},

  		.port_ops	= &atp850_port_ops,

  		.host_flags	= IDE_HFLAG_SERIALIZE |
  				  IDE_HFLAG_NO_ATAPI_DMA |

  				  IDE_HFLAG_NO_DSC |

  				  IDE_HFLAG_OFF_BOARD,

  		.pio_mask	= ATA_PIO4,

  		.mwdma_mask	= ATA_MWDMA2,
  		.udma_mask	= ATA_UDMA2,

  	},
  	{	/* 1: AEC6260 */
  		.name		= DRV_NAME,

  		.init_chipset	= init_chipset_aec62xx,

  		.port_ops	= &atp86x_port_ops,

  		.host_flags	= IDE_HFLAG_NO_ATAPI_DMA | IDE_HFLAG_NO_AUTODMA |
  				  IDE_HFLAG_OFF_BOARD,

  		.pio_mask	= ATA_PIO4,

  		.mwdma_mask	= ATA_MWDMA2,
  		.udma_mask	= ATA_UDMA4,

  	},
  	{	/* 2: AEC6260R */
  		.name		= DRV_NAME,

  		.init_chipset	= init_chipset_aec62xx,

  		.enablebits	= {{0x4a,0x02,0x02}, {0x4a,0x04,0x04}},

  		.port_ops	= &atp86x_port_ops,

  		.host_flags	= IDE_HFLAG_NO_ATAPI_DMA |

  				  IDE_HFLAG_NON_BOOTABLE,

  		.pio_mask	= ATA_PIO4,

  		.mwdma_mask	= ATA_MWDMA2,
  		.udma_mask	= ATA_UDMA4,

  	},
  	{	/* 3: AEC6280 */
  		.name		= DRV_NAME,

  		.init_chipset	= init_chipset_aec62xx,

  		.port_ops	= &atp86x_port_ops,

  		.host_flags	= IDE_HFLAG_NO_ATAPI_DMA |

  				  IDE_HFLAG_OFF_BOARD,

  		.pio_mask	= ATA_PIO4,

  		.mwdma_mask	= ATA_MWDMA2,
  		.udma_mask	= ATA_UDMA5,

  	},
  	{	/* 4: AEC6280R */
  		.name		= DRV_NAME,

  		.init_chipset	= init_chipset_aec62xx,

  		.enablebits	= {{0x4a,0x02,0x02}, {0x4a,0x04,0x04}},

  		.port_ops	= &atp86x_port_ops,

  		.host_flags	= IDE_HFLAG_NO_ATAPI_DMA |

  				  IDE_HFLAG_OFF_BOARD,

  		.pio_mask	= ATA_PIO4,

  		.mwdma_mask	= ATA_MWDMA2,
  		.udma_mask	= ATA_UDMA5,

  	}
  };
  
  /**
   *	aec62xx_init_one	-	called when a AEC is found
   *	@dev: the aec62xx device
   *	@id: the matching pci id
   *
   *	Called when the PCI registration layer (or the IDE initialization)
   *	finds a device matching our IDE device tables.

   *
   *	NOTE: since we're going to modify the 'name' field for AEC-6[26]80[R]

   *	chips, pass a local copy of 'struct ide_port_info' down the call chain.

   */

  static int aec62xx_init_one(struct pci_dev *dev, const struct pci_device_id *id)

  {

  	const struct chipset_bus_clock_list_entry *bus_clock;

  	struct ide_port_info d;

  	u8 idx = id->driver_data;

  	int bus_speed = ide_pci_clk ? ide_pci_clk : 33;

  	int err;

  	if (bus_speed <= 33)
  		bus_clock = aec6xxx_33_base;
  	else
  		bus_clock = aec6xxx_34_base;

  	err = pci_enable_device(dev);
  	if (err)
  		return err;

  
  	d = aec62xx_chipsets[idx];
  
  	if (idx == 3 || idx == 4) {
  		unsigned long dma_base = pci_resource_start(dev, 4);
  
  		if (inb(dma_base + 2) & 0x10) {

  			printk(KERN_INFO DRV_NAME " %s: AEC6880%s card detected"
  				"
  ", pci_name(dev), (idx == 4) ? "R" : "");

  			d.udma_mask = ATA_UDMA6;
  		}
  	}

  	err = ide_pci_init_one(dev, &d, (void *)bus_clock);

  	if (err)
  		pci_disable_device(dev);
  
  	return err;

  }

  static void aec62xx_remove(struct pci_dev *dev)

  {
  	ide_pci_remove(dev);
  	pci_disable_device(dev);
  }

  static const struct pci_device_id aec62xx_pci_tbl[] = {
  	{ PCI_VDEVICE(ARTOP, PCI_DEVICE_ID_ARTOP_ATP850UF), 0 },
  	{ PCI_VDEVICE(ARTOP, PCI_DEVICE_ID_ARTOP_ATP860),   1 },
  	{ PCI_VDEVICE(ARTOP, PCI_DEVICE_ID_ARTOP_ATP860R),  2 },
  	{ PCI_VDEVICE(ARTOP, PCI_DEVICE_ID_ARTOP_ATP865),   3 },
  	{ PCI_VDEVICE(ARTOP, PCI_DEVICE_ID_ARTOP_ATP865R),  4 },

  	{ 0, },
  };
  MODULE_DEVICE_TABLE(pci, aec62xx_pci_tbl);

  static struct pci_driver aec62xx_pci_driver = {

  	.name		= "AEC62xx_IDE",
  	.id_table	= aec62xx_pci_tbl,
  	.probe		= aec62xx_init_one,

  	.remove		= aec62xx_remove,

  	.suspend	= ide_pci_suspend,
  	.resume		= ide_pci_resume,

  };

  static int __init aec62xx_ide_init(void)

  {

  	return ide_pci_register_driver(&aec62xx_pci_driver);

  }

  static void __exit aec62xx_ide_exit(void)
  {

  	pci_unregister_driver(&aec62xx_pci_driver);

  }

  module_init(aec62xx_ide_init);

  module_exit(aec62xx_ide_exit);

  
  MODULE_AUTHOR("Andre Hedrick");
  MODULE_DESCRIPTION("PCI driver module for ARTOP AEC62xx IDE");
  MODULE_LICENSE("GPL");