1/* 2 * IDE tuning and bus mastering support for the CS5510/CS5520 3 * chipsets 4 * 5 * The CS5510/CS5520 are slightly unusual devices. Unlike the 6 * typical IDE controllers they do bus mastering with the drive in 7 * PIO mode and smarter silicon. 8 * 9 * The practical upshot of this is that we must always tune the 10 * drive for the right PIO mode. We must also ignore all the blacklists 11 * and the drive bus mastering DMA information. Also to confuse matters 12 * further we can do DMA on PIO only drives. 13 * 14 * DMA on the 5510 also requires we disable_hlt() during DMA on early 15 * revisions. 16 * 17 * *** This driver is strictly experimental *** 18 * 19 * (c) Copyright Red Hat Inc 2002 20 * 21 * This program is free software; you can redistribute it and/or modify it 22 * under the terms of the GNU General Public License as published by the 23 * Free Software Foundation; either version 2, or (at your option) any 24 * later version. 25 * 26 * This program is distributed in the hope that it will be useful, but 27 * WITHOUT ANY WARRANTY; without even the implied warranty of 28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 29 * General Public License for more details. 30 * 31 * Documentation: 32 * Not publicly available. 33 */ 34#include <linux/kernel.h> 35#include <linux/module.h> 36#include <linux/pci.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 "pata_cs5520" 43#define DRV_VERSION "0.6.6" 44 45struct pio_clocks 46{ 47 int address; 48 int assert; 49 int recovery; 50}; 51 52static const struct pio_clocks cs5520_pio_clocks[]={ 53 {3, 6, 11}, 54 {2, 5, 6}, 55 {1, 4, 3}, 56 {1, 3, 2}, 57 {1, 2, 1} 58}; 59 60/** 61 * cs5520_set_timings - program PIO timings 62 * @ap: ATA port 63 * @adev: ATA device 64 * 65 * Program the PIO mode timings for the controller according to the pio 66 * clocking table. 67 */ 68 69static void cs5520_set_timings(struct ata_port *ap, struct ata_device *adev, int pio) 70{ 71 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 72 int slave = adev->devno; 73 74 pio -= XFER_PIO_0; 75 76 /* Channel command timing */ 77 pci_write_config_byte(pdev, 0x62 + ap->port_no, 78 (cs5520_pio_clocks[pio].recovery << 4) | 79 (cs5520_pio_clocks[pio].assert)); 80 /* FIXME: should these use address ? */ 81 /* Read command timing */ 82 pci_write_config_byte(pdev, 0x64 + 4*ap->port_no + slave, 83 (cs5520_pio_clocks[pio].recovery << 4) | 84 (cs5520_pio_clocks[pio].assert)); 85 /* Write command timing */ 86 pci_write_config_byte(pdev, 0x66 + 4*ap->port_no + slave, 87 (cs5520_pio_clocks[pio].recovery << 4) | 88 (cs5520_pio_clocks[pio].assert)); 89} 90 91/** 92 * cs5520_set_piomode - program PIO timings 93 * @ap: ATA port 94 * @adev: ATA device 95 * 96 * Program the PIO mode timings for the controller according to the pio 97 * clocking table. 98 */ 99 100static void cs5520_set_piomode(struct ata_port *ap, struct ata_device *adev) 101{ 102 cs5520_set_timings(ap, adev, adev->pio_mode); 103} 104 105static struct scsi_host_template cs5520_sht = { 106 ATA_BMDMA_SHT(DRV_NAME), 107 .sg_tablesize = LIBATA_DUMB_MAX_PRD, 108}; 109 110static struct ata_port_operations cs5520_port_ops = { 111 .inherits = &ata_bmdma_port_ops, 112 .qc_prep = ata_bmdma_dumb_qc_prep, 113 .cable_detect = ata_cable_40wire, 114 .set_piomode = cs5520_set_piomode, 115}; 116 117static int cs5520_init_one(struct pci_dev *pdev, const struct pci_device_id *id) 118{ 119 static const unsigned int cmd_port[] = { 0x1F0, 0x170 }; 120 static const unsigned int ctl_port[] = { 0x3F6, 0x376 }; 121 struct ata_port_info pi = { 122 .flags = ATA_FLAG_SLAVE_POSS, 123 .pio_mask = ATA_PIO4, 124 .port_ops = &cs5520_port_ops, 125 }; 126 const struct ata_port_info *ppi[2]; 127 u8 pcicfg; 128 void __iomem *iomap[5]; 129 struct ata_host *host; 130 struct ata_ioports *ioaddr; 131 int i, rc; 132 133 rc = pcim_enable_device(pdev); 134 if (rc) 135 return rc; 136 137 /* IDE port enable bits */ 138 pci_read_config_byte(pdev, 0x60, &pcicfg); 139 140 /* Check if the ATA ports are enabled */ 141 if ((pcicfg & 3) == 0) 142 return -ENODEV; 143 144 ppi[0] = ppi[1] = &ata_dummy_port_info; 145 if (pcicfg & 1) 146 ppi[0] = π 147 if (pcicfg & 2) 148 ppi[1] = π 149 150 if ((pcicfg & 0x40) == 0) { 151 dev_warn(&pdev->dev, "DMA mode disabled. Enabling.\n"); 152 pci_write_config_byte(pdev, 0x60, pcicfg | 0x40); 153 } 154 155 pi.mwdma_mask = id->driver_data; 156 157 host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2); 158 if (!host) 159 return -ENOMEM; 160 161 /* Perform set up for DMA */ 162 if (pci_enable_device_io(pdev)) { 163 printk(KERN_ERR DRV_NAME ": unable to configure BAR2.\n"); 164 return -ENODEV; 165 } 166 167 if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) { 168 printk(KERN_ERR DRV_NAME ": unable to configure DMA mask.\n"); 169 return -ENODEV; 170 } 171 if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32))) { 172 printk(KERN_ERR DRV_NAME ": unable to configure consistent DMA mask.\n"); 173 return -ENODEV; 174 } 175 176 /* Map IO ports and initialize host accordingly */ 177 iomap[0] = devm_ioport_map(&pdev->dev, cmd_port[0], 8); 178 iomap[1] = devm_ioport_map(&pdev->dev, ctl_port[0], 1); 179 iomap[2] = devm_ioport_map(&pdev->dev, cmd_port[1], 8); 180 iomap[3] = devm_ioport_map(&pdev->dev, ctl_port[1], 1); 181 iomap[4] = pcim_iomap(pdev, 2, 0); 182 183 if (!iomap[0] || !iomap[1] || !iomap[2] || !iomap[3] || !iomap[4]) 184 return -ENOMEM; 185 186 ioaddr = &host->ports[0]->ioaddr; 187 ioaddr->cmd_addr = iomap[0]; 188 ioaddr->ctl_addr = iomap[1]; 189 ioaddr->altstatus_addr = iomap[1]; 190 ioaddr->bmdma_addr = iomap[4]; 191 ata_sff_std_ports(ioaddr); 192 193 ata_port_desc(host->ports[0], 194 "cmd 0x%x ctl 0x%x", cmd_port[0], ctl_port[0]); 195 ata_port_pbar_desc(host->ports[0], 4, 0, "bmdma"); 196 197 ioaddr = &host->ports[1]->ioaddr; 198 ioaddr->cmd_addr = iomap[2]; 199 ioaddr->ctl_addr = iomap[3]; 200 ioaddr->altstatus_addr = iomap[3]; 201 ioaddr->bmdma_addr = iomap[4] + 8; 202 ata_sff_std_ports(ioaddr); 203 204 ata_port_desc(host->ports[1], 205 "cmd 0x%x ctl 0x%x", cmd_port[1], ctl_port[1]); 206 ata_port_pbar_desc(host->ports[1], 4, 8, "bmdma"); 207 208 /* activate the host */ 209 pci_set_master(pdev); 210 rc = ata_host_start(host); 211 if (rc) 212 return rc; 213 214 for (i = 0; i < 2; i++) { 215 static const int irq[] = { 14, 15 }; 216 struct ata_port *ap = host->ports[i]; 217 218 if (ata_port_is_dummy(ap)) 219 continue; 220 221 rc = devm_request_irq(&pdev->dev, irq[ap->port_no], 222 ata_bmdma_interrupt, 0, DRV_NAME, host); 223 if (rc) 224 return rc; 225 226 ata_port_desc(ap, "irq %d", irq[i]); 227 } 228 229 return ata_host_register(host, &cs5520_sht); 230} 231 232#ifdef CONFIG_PM_SLEEP 233/** 234 * cs5520_reinit_one - device resume 235 * @pdev: PCI device 236 * 237 * Do any reconfiguration work needed by a resume from RAM. We need 238 * to restore DMA mode support on BIOSen which disabled it 239 */ 240 241static int cs5520_reinit_one(struct pci_dev *pdev) 242{ 243 struct ata_host *host = pci_get_drvdata(pdev); 244 u8 pcicfg; 245 int rc; 246 247 rc = ata_pci_device_do_resume(pdev); 248 if (rc) 249 return rc; 250 251 pci_read_config_byte(pdev, 0x60, &pcicfg); 252 if ((pcicfg & 0x40) == 0) 253 pci_write_config_byte(pdev, 0x60, pcicfg | 0x40); 254 255 ata_host_resume(host); 256 return 0; 257} 258 259/** 260 * cs5520_pci_device_suspend - device suspend 261 * @pdev: PCI device 262 * 263 * We have to cut and waste bits from the standard method because 264 * the 5520 is a bit odd and not just a pure ATA device. As a result 265 * we must not disable it. The needed code is short and this avoids 266 * chip specific mess in the core code. 267 */ 268 269static int cs5520_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg) 270{ 271 struct ata_host *host = pci_get_drvdata(pdev); 272 int rc = 0; 273 274 rc = ata_host_suspend(host, mesg); 275 if (rc) 276 return rc; 277 278 pci_save_state(pdev); 279 return 0; 280} 281#endif /* CONFIG_PM_SLEEP */ 282 283/* For now keep DMA off. We can set it for all but A rev CS5510 once the 284 core ATA code can handle it */ 285 286static const struct pci_device_id pata_cs5520[] = { 287 { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5510), }, 288 { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5520), }, 289 290 { }, 291}; 292 293static struct pci_driver cs5520_pci_driver = { 294 .name = DRV_NAME, 295 .id_table = pata_cs5520, 296 .probe = cs5520_init_one, 297 .remove = ata_pci_remove_one, 298#ifdef CONFIG_PM_SLEEP 299 .suspend = cs5520_pci_device_suspend, 300 .resume = cs5520_reinit_one, 301#endif 302}; 303 304module_pci_driver(cs5520_pci_driver); 305 306MODULE_AUTHOR("Alan Cox"); 307MODULE_DESCRIPTION("low-level driver for Cyrix CS5510/5520"); 308MODULE_LICENSE("GPL"); 309MODULE_DEVICE_TABLE(pci, pata_cs5520); 310MODULE_VERSION(DRV_VERSION); 311