1/* 2 * New ATA layer SC1200 driver Alan Cox <alan@redhat.com> 3 * 4 * TODO: Mode selection filtering 5 * TODO: Can't enable second channel until ATA core has serialize 6 * TODO: Needs custom DMA cleanup code 7 * 8 * Based very heavily on 9 * 10 * linux/drivers/ide/pci/sc1200.c Version 0.91 28-Jan-2003 11 * 12 * Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com> 13 * May be copied or modified under the terms of the GNU General Public License 14 * 15 * Development of this chipset driver was funded 16 * by the nice folks at National Semiconductor. 17 * 18 * This program is free software; you can redistribute it and/or modify 19 * it under the terms of the GNU General Public License version 2 as 20 * published by the Free Software Foundation. 21 * 22 * This program is distributed in the hope that it will be useful, 23 * but WITHOUT ANY WARRANTY; without even the implied warranty of 24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 25 * GNU General Public License for more details. 26 * 27 * You should have received a copy of the GNU General Public License 28 * along with this program; if not, write to the Free Software 29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 30 * 31 */ 32 33#include <linux/kernel.h> 34#include <linux/module.h> 35#include <linux/pci.h> 36#include <linux/init.h> 37#include <linux/blkdev.h> 38#include <linux/delay.h> 39#include <scsi/scsi_host.h> 40#include <linux/libata.h> 41 42#define DRV_NAME "sc1200" 43#define DRV_VERSION "0.2.5" 44 45#define SC1200_REV_A 0x00 46#define SC1200_REV_B1 0x01 47#define SC1200_REV_B3 0x02 48#define SC1200_REV_C1 0x03 49#define SC1200_REV_D1 0x04 50 51/** 52 * sc1200_clock - PCI clock 53 * 54 * Return the PCI bus clocking for the SC1200 chipset configuration 55 * in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz 56 */ 57 58static int sc1200_clock(void) 59{ 60 /* Magic registers that give us the chipset data */ 61 u8 chip_id = inb(0x903C); 62 u8 silicon_rev = inb(0x903D); 63 u16 pci_clock; 64 65 if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1) 66 return 0; /* 33 MHz mode */ 67 68 /* Clock generator configuration 0x901E its 8/9 are the PCI clocking 69 0/3 is 33Mhz 1 is 48 2 is 66 */ 70 71 pci_clock = inw(0x901E); 72 pci_clock >>= 8; 73 pci_clock &= 0x03; 74 if (pci_clock == 3) 75 pci_clock = 0; 76 return pci_clock; 77} 78 79/** 80 * sc1200_set_piomode - PIO setup 81 * @ap: ATA interface 82 * @adev: device on the interface 83 * 84 * Set our PIO requirements. This is fairly simple on the SC1200 85 */ 86 87static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev) 88{ 89 static const u32 pio_timings[4][5] = { 90 {0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010}, // format0 33Mhz 91 {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}, // format1, 33Mhz 92 {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021}, // format1, 48Mhz 93 {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131} // format1, 66Mhz 94 }; 95 96 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 97 u32 format; 98 unsigned int reg = 0x40 + 0x10 * ap->port_no; 99 int mode = adev->pio_mode - XFER_PIO_0; 100 101 pci_read_config_dword(pdev, reg + 4, &format); 102 format >>= 31; 103 format += sc1200_clock(); 104 pci_write_config_dword(pdev, reg + 8 * adev->devno, 105 pio_timings[format][mode]); 106} 107 108/** 109 * sc1200_set_dmamode - DMA timing setup 110 * @ap: ATA interface 111 * @adev: Device being configured 112 * 113 * We cannot mix MWDMA and UDMA without reloading timings each switch 114 * master to slave. 115 */ 116 117static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev) 118{ 119 static const u32 udma_timing[3][3] = { 120 { 0x00921250, 0x00911140, 0x00911030 }, 121 { 0x00932470, 0x00922260, 0x00922140 }, 122 { 0x009436A1, 0x00933481, 0x00923261 } 123 }; 124 125 static const u32 mwdma_timing[3][3] = { 126 { 0x00077771, 0x00012121, 0x00002020 }, 127 { 0x000BBBB2, 0x00024241, 0x00013131 }, 128 { 0x000FFFF3, 0x00035352, 0x00015151 } 129 }; 130 131 int clock = sc1200_clock(); 132 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 133 unsigned int reg = 0x40 + 0x10 * ap->port_no; 134 int mode = adev->dma_mode; 135 u32 format; 136 137 if (mode >= XFER_UDMA_0) 138 format = udma_timing[clock][mode - XFER_UDMA_0]; 139 else 140 format = mwdma_timing[clock][mode - XFER_MW_DMA_0]; 141 142 if (adev->devno == 0) { 143 u32 timings; 144 145 pci_read_config_dword(pdev, reg + 4, &timings); 146 timings &= 0x80000000UL; 147 timings |= format; 148 pci_write_config_dword(pdev, reg + 4, timings); 149 } else 150 pci_write_config_dword(pdev, reg + 12, format); 151} 152 153/** 154 * sc1200_qc_issue_prot - command issue 155 * @qc: command pending 156 * 157 * Called when the libata layer is about to issue a command. We wrap 158 * this interface so that we can load the correct ATA timings if 159 * neccessary. Specifically we have a problem that there is only 160 * one MWDMA/UDMA bit. 161 */ 162 163static unsigned int sc1200_qc_issue_prot(struct ata_queued_cmd *qc) 164{ 165 struct ata_port *ap = qc->ap; 166 struct ata_device *adev = qc->dev; 167 struct ata_device *prev = ap->private_data; 168 169 /* See if the DMA settings could be wrong */ 170 if (adev->dma_mode != 0 && adev != prev && prev != NULL) { 171 /* Maybe, but do the channels match MWDMA/UDMA ? */ 172 if ((adev->dma_mode >= XFER_UDMA_0 && prev->dma_mode < XFER_UDMA_0) || 173 (adev->dma_mode < XFER_UDMA_0 && prev->dma_mode >= XFER_UDMA_0)) 174 /* Switch the mode bits */ 175 sc1200_set_dmamode(ap, adev); 176 } 177 178 return ata_qc_issue_prot(qc); 179} 180 181static struct scsi_host_template sc1200_sht = { 182 .module = THIS_MODULE, 183 .name = DRV_NAME, 184 .ioctl = ata_scsi_ioctl, 185 .queuecommand = ata_scsi_queuecmd, 186 .can_queue = ATA_DEF_QUEUE, 187 .this_id = ATA_SHT_THIS_ID, 188 .sg_tablesize = LIBATA_MAX_PRD, 189 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 190 .emulated = ATA_SHT_EMULATED, 191 .use_clustering = ATA_SHT_USE_CLUSTERING, 192 .proc_name = DRV_NAME, 193 .dma_boundary = ATA_DMA_BOUNDARY, 194 .slave_configure = ata_scsi_slave_config, 195 .slave_destroy = ata_scsi_slave_destroy, 196 .bios_param = ata_std_bios_param, 197}; 198 199static struct ata_port_operations sc1200_port_ops = { 200 .port_disable = ata_port_disable, 201 .set_piomode = sc1200_set_piomode, 202 .set_dmamode = sc1200_set_dmamode, 203 .mode_filter = ata_pci_default_filter, 204 205 .tf_load = ata_tf_load, 206 .tf_read = ata_tf_read, 207 .check_status = ata_check_status, 208 .exec_command = ata_exec_command, 209 .dev_select = ata_std_dev_select, 210 211 .freeze = ata_bmdma_freeze, 212 .thaw = ata_bmdma_thaw, 213 .error_handler = ata_bmdma_error_handler, 214 .post_internal_cmd = ata_bmdma_post_internal_cmd, 215 .cable_detect = ata_cable_40wire, 216 217 .bmdma_setup = ata_bmdma_setup, 218 .bmdma_start = ata_bmdma_start, 219 .bmdma_stop = ata_bmdma_stop, 220 .bmdma_status = ata_bmdma_status, 221 222 .qc_prep = ata_qc_prep, 223 .qc_issue = sc1200_qc_issue_prot, 224 225 .data_xfer = ata_data_xfer, 226 227 .irq_handler = ata_interrupt, 228 .irq_clear = ata_bmdma_irq_clear, 229 .irq_on = ata_irq_on, 230 .irq_ack = ata_irq_ack, 231 232 .port_start = ata_port_start, 233}; 234 235/** 236 * sc1200_init_one - Initialise an SC1200 237 * @dev: PCI device 238 * @id: Entry in match table 239 * 240 * Just throw the needed data at the libata helper and it does all 241 * our work. 242 */ 243 244static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id) 245{ 246 static const struct ata_port_info info = { 247 .sht = &sc1200_sht, 248 .flags = ATA_FLAG_SLAVE_POSS|ATA_FLAG_SRST, 249 .pio_mask = 0x1f, 250 .mwdma_mask = 0x07, 251 .udma_mask = 0x07, 252 .port_ops = &sc1200_port_ops 253 }; 254 /* Can't enable port 2 yet, see top comments */ 255 const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info }; 256 257 return ata_pci_init_one(dev, ppi); 258} 259 260static const struct pci_device_id sc1200[] = { 261 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), }, 262 263 { }, 264}; 265 266static struct pci_driver sc1200_pci_driver = { 267 .name = DRV_NAME, 268 .id_table = sc1200, 269 .probe = sc1200_init_one, 270 .remove = ata_pci_remove_one, 271#ifdef CONFIG_PM 272 .suspend = ata_pci_device_suspend, 273 .resume = ata_pci_device_resume, 274#endif 275}; 276 277static int __init sc1200_init(void) 278{ 279 return pci_register_driver(&sc1200_pci_driver); 280} 281 282static void __exit sc1200_exit(void) 283{ 284 pci_unregister_driver(&sc1200_pci_driver); 285} 286 287MODULE_AUTHOR("Alan Cox, Mark Lord"); 288MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200"); 289MODULE_LICENSE("GPL"); 290MODULE_DEVICE_TABLE(pci, sc1200); 291MODULE_VERSION(DRV_VERSION); 292 293module_init(sc1200_init); 294module_exit(sc1200_exit); 295