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Linux/drivers/ata/pata_cs5535.c

  1 /*
  2  * pata-cs5535.c        - CS5535 PATA for new ATA layer
  3  *                        (C) 2005-2006 Red Hat Inc
  4  *                        Alan Cox <alan@lxorguk.ukuu.org.uk>
  5  *
  6  * based upon cs5535.c from AMD <Jens.Altmann@amd.com> as cleaned up and
  7  * made readable and Linux style by Wolfgang Zuleger <wolfgang.zuleger@gmx.de>
  8  * and Alexander Kiausch <alex.kiausch@t-online.de>
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License version 2 as
 12  * published by the Free Software Foundation.
 13  *
 14  * This program is distributed in the hope that it will be useful,
 15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 17  * GNU General Public License for more details.
 18  *
 19  * You should have received a copy of the GNU General Public License
 20  * along with this program; if not, write to the Free Software
 21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 22  *
 23  * Loosely based on the piix & svwks drivers.
 24  *
 25  * Documentation:
 26  *      Available from AMD web site.
 27  * TODO
 28  *      Review errata to see if serializing is necessary
 29  */
 30 
 31 #include <linux/kernel.h>
 32 #include <linux/module.h>
 33 #include <linux/pci.h>
 34 #include <linux/blkdev.h>
 35 #include <linux/delay.h>
 36 #include <scsi/scsi_host.h>
 37 #include <linux/libata.h>
 38 #include <asm/msr.h>
 39 
 40 #define DRV_NAME        "pata_cs5535"
 41 #define DRV_VERSION     "0.2.12"
 42 
 43 /*
 44  *      The Geode (Aka Athlon GX now) uses an internal MSR based
 45  *      bus system for control. Demented but there you go.
 46  */
 47 
 48 #define MSR_ATAC_BASE           0x51300000
 49 #define ATAC_GLD_MSR_CAP        (MSR_ATAC_BASE+0)
 50 #define ATAC_GLD_MSR_CONFIG    (MSR_ATAC_BASE+0x01)
 51 #define ATAC_GLD_MSR_SMI       (MSR_ATAC_BASE+0x02)
 52 #define ATAC_GLD_MSR_ERROR     (MSR_ATAC_BASE+0x03)
 53 #define ATAC_GLD_MSR_PM        (MSR_ATAC_BASE+0x04)
 54 #define ATAC_GLD_MSR_DIAG      (MSR_ATAC_BASE+0x05)
 55 #define ATAC_IO_BAR            (MSR_ATAC_BASE+0x08)
 56 #define ATAC_RESET             (MSR_ATAC_BASE+0x10)
 57 #define ATAC_CH0D0_PIO         (MSR_ATAC_BASE+0x20)
 58 #define ATAC_CH0D0_DMA         (MSR_ATAC_BASE+0x21)
 59 #define ATAC_CH0D1_PIO         (MSR_ATAC_BASE+0x22)
 60 #define ATAC_CH0D1_DMA         (MSR_ATAC_BASE+0x23)
 61 #define ATAC_PCI_ABRTERR       (MSR_ATAC_BASE+0x24)
 62 
 63 #define ATAC_BM0_CMD_PRIM      0x00
 64 #define ATAC_BM0_STS_PRIM      0x02
 65 #define ATAC_BM0_PRD           0x04
 66 
 67 #define CS5535_CABLE_DETECT    0x48
 68 
 69 /**
 70  *      cs5535_cable_detect     -       detect cable type
 71  *      @ap: Port to detect on
 72  *
 73  *      Perform cable detection for ATA66 capable cable. Return a libata
 74  *      cable type.
 75  */
 76 
 77 static int cs5535_cable_detect(struct ata_port *ap)
 78 {
 79         u8 cable;
 80         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 81 
 82         pci_read_config_byte(pdev, CS5535_CABLE_DETECT, &cable);
 83         if (cable & 1)
 84                 return ATA_CBL_PATA80;
 85         else
 86                 return ATA_CBL_PATA40;
 87 }
 88 
 89 /**
 90  *      cs5535_set_piomode              -       PIO setup
 91  *      @ap: ATA interface
 92  *      @adev: device on the interface
 93  *
 94  *      Set our PIO requirements. The CS5535 is pretty clean about all this
 95  */
 96 
 97 static void cs5535_set_piomode(struct ata_port *ap, struct ata_device *adev)
 98 {
 99         static const u16 pio_timings[5] = {
100                 0xF7F4, 0xF173, 0x8141, 0x5131, 0x1131
101         };
102         static const u16 pio_cmd_timings[5] = {
103                 0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
104         };
105         u32 reg, dummy;
106         struct ata_device *pair = ata_dev_pair(adev);
107 
108         int mode = adev->pio_mode - XFER_PIO_0;
109         int cmdmode = mode;
110 
111         /* Command timing has to be for the lowest of the pair of devices */
112         if (pair) {
113                 int pairmode = pair->pio_mode - XFER_PIO_0;
114                 cmdmode = min(mode, pairmode);
115                 /* Write the other drive timing register if it changed */
116                 if (cmdmode < pairmode)
117                         wrmsr(ATAC_CH0D0_PIO + 2 * pair->devno,
118                                 pio_cmd_timings[cmdmode] << 16 | pio_timings[pairmode], 0);
119         }
120         /* Write the drive timing register */
121         wrmsr(ATAC_CH0D0_PIO + 2 * adev->devno,
122                 pio_cmd_timings[cmdmode] << 16 | pio_timings[mode], 0);
123 
124         /* Set the PIO "format 1" bit in the DMA timing register */
125         rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
126         wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg | 0x80000000UL, 0);
127 }
128 
129 /**
130  *      cs5535_set_dmamode              -       DMA timing setup
131  *      @ap: ATA interface
132  *      @adev: Device being configured
133  *
134  */
135 
136 static void cs5535_set_dmamode(struct ata_port *ap, struct ata_device *adev)
137 {
138         static const u32 udma_timings[5] = {
139                 0x7F7436A1, 0x7F733481, 0x7F723261, 0x7F713161, 0x7F703061
140         };
141         static const u32 mwdma_timings[3] = {
142                 0x7F0FFFF3, 0x7F035352, 0x7F024241
143         };
144         u32 reg, dummy;
145         int mode = adev->dma_mode;
146 
147         rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
148         reg &= 0x80000000UL;
149         if (mode >= XFER_UDMA_0)
150                 reg |= udma_timings[mode - XFER_UDMA_0];
151         else
152                 reg |= mwdma_timings[mode - XFER_MW_DMA_0];
153         wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, 0);
154 }
155 
156 static struct scsi_host_template cs5535_sht = {
157         ATA_BMDMA_SHT(DRV_NAME),
158 };
159 
160 static struct ata_port_operations cs5535_port_ops = {
161         .inherits       = &ata_bmdma_port_ops,
162         .cable_detect   = cs5535_cable_detect,
163         .set_piomode    = cs5535_set_piomode,
164         .set_dmamode    = cs5535_set_dmamode,
165 };
166 
167 /**
168  *      cs5535_init_one         -       Initialise a CS5530
169  *      @dev: PCI device
170  *      @id: Entry in match table
171  *
172  *      Install a driver for the newly found CS5530 companion chip. Most of
173  *      this is just housekeeping. We have to set the chip up correctly and
174  *      turn off various bits of emulation magic.
175  */
176 
177 static int cs5535_init_one(struct pci_dev *dev, const struct pci_device_id *id)
178 {
179         static const struct ata_port_info info = {
180                 .flags = ATA_FLAG_SLAVE_POSS,
181                 .pio_mask = ATA_PIO4,
182                 .mwdma_mask = ATA_MWDMA2,
183                 .udma_mask = ATA_UDMA4,
184                 .port_ops = &cs5535_port_ops
185         };
186         const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
187 
188         return ata_pci_bmdma_init_one(dev, ppi, &cs5535_sht, NULL, 0);
189 }
190 
191 static const struct pci_device_id cs5535[] = {
192         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_CS5535_IDE), },
193         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5535_IDE), },
194 
195         { },
196 };
197 
198 static struct pci_driver cs5535_pci_driver = {
199         .name           = DRV_NAME,
200         .id_table       = cs5535,
201         .probe          = cs5535_init_one,
202         .remove         = ata_pci_remove_one,
203 #ifdef CONFIG_PM_SLEEP
204         .suspend        = ata_pci_device_suspend,
205         .resume         = ata_pci_device_resume,
206 #endif
207 };
208 
209 module_pci_driver(cs5535_pci_driver);
210 
211 MODULE_AUTHOR("Alan Cox, Jens Altmann, Wolfgan Zuleger, Alexander Kiausch");
212 MODULE_DESCRIPTION("low-level driver for the NS/AMD 5535");
213 MODULE_LICENSE("GPL");
214 MODULE_DEVICE_TABLE(pci, cs5535);
215 MODULE_VERSION(DRV_VERSION);
216 

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