drivers/ata/pata_cypress.c

   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                 ata_dev_err(adev, 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 const 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);