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Linux/drivers/ata/pata_ns87410.c

  1 /*
  2  * pata_ns87410.c       - National Semiconductor 87410 PATA for new ATA layer
  3  *                        (C) 2006 Red Hat Inc
  4  *
  5  *  This program is free software; you can redistribute it and/or modify
  6  *  it under the terms of the GNU General Public License as published by
  7  *  the Free Software Foundation; either version 2, or (at your option)
  8  *  any later version.
  9  *
 10  *  This program is distributed in the hope that it will be useful,
 11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  *  GNU General Public License for more details.
 14  *
 15  *  You should have received a copy of the GNU General Public License
 16  *  along with this program; see the file COPYING.  If not, write to
 17  *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 18  */
 19 
 20 #include <linux/kernel.h>
 21 #include <linux/module.h>
 22 #include <linux/pci.h>
 23 #include <linux/blkdev.h>
 24 #include <linux/delay.h>
 25 #include <scsi/scsi_host.h>
 26 #include <linux/libata.h>
 27 
 28 #define DRV_NAME "pata_ns87410"
 29 #define DRV_VERSION "0.4.6"
 30 
 31 /**
 32  *      ns87410_pre_reset               -       probe begin
 33  *      @link: ATA link
 34  *      @deadline: deadline jiffies for the operation
 35  *
 36  *      Check enabled ports
 37  */
 38 
 39 static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline)
 40 {
 41         struct ata_port *ap = link->ap;
 42         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 43         static const struct pci_bits ns87410_enable_bits[] = {
 44                 { 0x43, 1, 0x08, 0x08 },
 45                 { 0x47, 1, 0x08, 0x08 }
 46         };
 47 
 48         if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))
 49                 return -ENOENT;
 50 
 51         return ata_sff_prereset(link, deadline);
 52 }
 53 
 54 /**
 55  *      ns87410_set_piomode     -       set initial PIO mode data
 56  *      @ap: ATA interface
 57  *      @adev: ATA device
 58  *
 59  *      Program timing data. This is kept per channel not per device,
 60  *      and only affects the data port.
 61  */
 62 
 63 static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
 64 {
 65         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 66         int port = 0x40 + 4 * ap->port_no;
 67         u8 idetcr, idefr;
 68         struct ata_timing at;
 69 
 70         static const u8 activebits[15] = {
 71                 0, 1, 2, 3, 4,
 72                 5, 5, 6, 6, 6,
 73                 6, 7, 7, 7, 7
 74         };
 75 
 76         static const u8 recoverbits[12] = {
 77                 0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
 78         };
 79 
 80         pci_read_config_byte(pdev, port + 3, &idefr);
 81 
 82         if (ata_pio_need_iordy(adev))
 83                 idefr |= 0x04;  /* IORDY enable */
 84         else
 85                 idefr &= ~0x04;
 86 
 87         if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
 88                 dev_err(&pdev->dev, "unknown mode %d\n", adev->pio_mode);
 89                 return;
 90         }
 91 
 92         at.active = clamp_val(at.active, 2, 16) - 2;
 93         at.setup = clamp_val(at.setup, 1, 4) - 1;
 94         at.recover = clamp_val(at.recover, 1, 12) - 1;
 95 
 96         idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
 97 
 98         pci_write_config_byte(pdev, port, idetcr);
 99         pci_write_config_byte(pdev, port + 3, idefr);
100         /* We use ap->private_data as a pointer to the device currently
101            loaded for timing */
102         ap->private_data = adev;
103 }
104 
105 /**
106  *      ns87410_qc_issue        -       command issue
107  *      @qc: command pending
108  *
109  *      Called when the libata layer is about to issue a command. We wrap
110  *      this interface so that we can load the correct ATA timings if
111  *      necessary.
112  */
113 
114 static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc)
115 {
116         struct ata_port *ap = qc->ap;
117         struct ata_device *adev = qc->dev;
118 
119         /* If modes have been configured and the channel data is not loaded
120            then load it. We have to check if pio_mode is set as the core code
121            does not set adev->pio_mode to XFER_PIO_0 while probing as would be
122            logical */
123 
124         if (adev->pio_mode && adev != ap->private_data)
125                 ns87410_set_piomode(ap, adev);
126 
127         return ata_sff_qc_issue(qc);
128 }
129 
130 static struct scsi_host_template ns87410_sht = {
131         ATA_PIO_SHT(DRV_NAME),
132 };
133 
134 static struct ata_port_operations ns87410_port_ops = {
135         .inherits       = &ata_sff_port_ops,
136         .qc_issue       = ns87410_qc_issue,
137         .cable_detect   = ata_cable_40wire,
138         .set_piomode    = ns87410_set_piomode,
139         .prereset       = ns87410_pre_reset,
140 };
141 
142 static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
143 {
144         static const struct ata_port_info info = {
145                 .flags = ATA_FLAG_SLAVE_POSS,
146                 .pio_mask = ATA_PIO3,
147                 .port_ops = &ns87410_port_ops
148         };
149         const struct ata_port_info *ppi[] = { &info, NULL };
150         return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL, 0);
151 }
152 
153 static const struct pci_device_id ns87410[] = {
154         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
155 
156         { },
157 };
158 
159 static struct pci_driver ns87410_pci_driver = {
160         .name           = DRV_NAME,
161         .id_table       = ns87410,
162         .probe          = ns87410_init_one,
163         .remove         = ata_pci_remove_one,
164 #ifdef CONFIG_PM_SLEEP
165         .suspend        = ata_pci_device_suspend,
166         .resume         = ata_pci_device_resume,
167 #endif
168 };
169 
170 module_pci_driver(ns87410_pci_driver);
171 
172 MODULE_AUTHOR("Alan Cox");
173 MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
174 MODULE_LICENSE("GPL");
175 MODULE_DEVICE_TABLE(pci, ns87410);
176 MODULE_VERSION(DRV_VERSION);
177 

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