1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * pata_cypress.c - Cypress PATA for new ATA layer 4 * (C) 2006 Red Hat Inc 5 * Alan Cox 6 * 7 * Based heavily on 8 * linux/drivers/ide/pci/cy82c693.c Version 0.40 Sep. 10, 2002 9 * 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/pci.h> 15 #include <linux/blkdev.h> 16 #include <linux/delay.h> 17 #include <scsi/scsi_host.h> 18 #include <linux/libata.h> 19 20 #define DRV_NAME "pata_cypress" 21 #define DRV_VERSION "0.1.5" 22 23 /* here are the offset definitions for the registers */ 24 25 enum { 26 CY82_IDE_CMDREG = 0x04, 27 CY82_IDE_ADDRSETUP = 0x48, 28 CY82_IDE_MASTER_IOR = 0x4C, 29 CY82_IDE_MASTER_IOW = 0x4D, 30 CY82_IDE_SLAVE_IOR = 0x4E, 31 CY82_IDE_SLAVE_IOW = 0x4F, 32 CY82_IDE_MASTER_8BIT = 0x50, 33 CY82_IDE_SLAVE_8BIT = 0x51, 34 35 CY82_INDEX_PORT = 0x22, 36 CY82_DATA_PORT = 0x23, 37 38 CY82_INDEX_CTRLREG1 = 0x01, 39 CY82_INDEX_CHANNEL0 = 0x30, 40 CY82_INDEX_CHANNEL1 = 0x31, 41 CY82_INDEX_TIMEOUT = 0x32 42 }; 43 44 static bool enable_dma = true; 45 module_param(enable_dma, bool, 0); 46 MODULE_PARM_DESC(enable_dma, "Enable bus master DMA operations"); 47 48 /** 49 * cy82c693_set_piomode - set initial PIO mode data 50 * @ap: ATA interface 51 * @adev: ATA device 52 * 53 * Called to do the PIO mode setup. 54 */ 55 56 static void cy82c693_set_piomode(struct ata_port *ap, struct ata_device *adev) 57 { 58 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 59 struct ata_timing t; 60 const unsigned long T = 1000000 / 33; 61 short time_16, time_8; 62 u32 addr; 63 64 if (ata_timing_compute(adev, adev->pio_mode, &t, T, 1) < 0) { 65 printk(KERN_ERR DRV_NAME ": mome computation failed.\n"); 66 return; 67 } 68 69 time_16 = clamp_val(t.recover - 1, 0, 15) | 70 (clamp_val(t.active - 1, 0, 15) << 4); 71 time_8 = clamp_val(t.act8b - 1, 0, 15) | 72 (clamp_val(t.rec8b - 1, 0, 15) << 4); 73 74 if (adev->devno == 0) { 75 pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr); 76 77 addr &= ~0x0F; /* Mask bits */ 78 addr |= clamp_val(t.setup - 1, 0, 15); 79 80 pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr); 81 pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16); 82 pci_write_config_byte(pdev, CY82_IDE_MASTER_IOW, time_16); 83 pci_write_config_byte(pdev, CY82_IDE_MASTER_8BIT, time_8); 84 } else { 85 pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr); 86 87 addr &= ~0xF0; /* Mask bits */ 88 addr |= (clamp_val(t.setup - 1, 0, 15) << 4); 89 90 pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr); 91 pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16); 92 pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOW, time_16); 93 pci_write_config_byte(pdev, CY82_IDE_SLAVE_8BIT, time_8); 94 } 95 } 96 97 /** 98 * cy82c693_set_dmamode - set initial DMA mode data 99 * @ap: ATA interface 100 * @adev: ATA device 101 * 102 * Called to do the DMA mode setup. 103 */ 104 105 static void cy82c693_set_dmamode(struct ata_port *ap, struct ata_device *adev) 106 { 107 int reg = CY82_INDEX_CHANNEL0 + ap->port_no; 108 109 /* Be afraid, be very afraid. Magic registers in low I/O space */ 110 outb(reg, 0x22); 111 outb(adev->dma_mode - XFER_MW_DMA_0, 0x23); 112 113 /* 0x50 gives the best behaviour on the Alpha's using this chip */ 114 outb(CY82_INDEX_TIMEOUT, 0x22); 115 outb(0x50, 0x23); 116 } 117 118 static struct scsi_host_template cy82c693_sht = { 119 ATA_BMDMA_SHT(DRV_NAME), 120 }; 121 122 static struct ata_port_operations cy82c693_port_ops = { 123 .inherits = &ata_bmdma_port_ops, 124 .cable_detect = ata_cable_40wire, 125 .set_piomode = cy82c693_set_piomode, 126 .set_dmamode = cy82c693_set_dmamode, 127 }; 128 129 static int cy82c693_init_one(struct pci_dev *pdev, const struct pci_device_id *id) 130 { 131 static struct ata_port_info info = { 132 .flags = ATA_FLAG_SLAVE_POSS, 133 .pio_mask = ATA_PIO4, 134 .port_ops = &cy82c693_port_ops 135 }; 136 const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info }; 137 138 if (enable_dma) 139 info.mwdma_mask = ATA_MWDMA2; 140 141 /* Devfn 1 is the ATA primary. The secondary is magic and on devfn2. 142 For the moment we don't handle the secondary. FIXME */ 143 144 if (PCI_FUNC(pdev->devfn) != 1) 145 return -ENODEV; 146 147 return ata_pci_bmdma_init_one(pdev, ppi, &cy82c693_sht, NULL, 0); 148 } 149 150 static const struct pci_device_id cy82c693[] = { 151 { PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), }, 152 153 { }, 154 }; 155 156 static struct pci_driver cy82c693_pci_driver = { 157 .name = DRV_NAME, 158 .id_table = cy82c693, 159 .probe = cy82c693_init_one, 160 .remove = ata_pci_remove_one, 161 #ifdef CONFIG_PM_SLEEP 162 .suspend = ata_pci_device_suspend, 163 .resume = ata_pci_device_resume, 164 #endif 165 }; 166 167 module_pci_driver(cy82c693_pci_driver); 168 169 MODULE_AUTHOR("Alan Cox"); 170 MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller"); 171 MODULE_LICENSE("GPL"); 172 MODULE_DEVICE_TABLE(pci, cy82c693); 173 MODULE_VERSION(DRV_VERSION); 174