1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * pata_cmd640.c - CMD640 PCI PATA for new ATA layer 4 * (C) 2007 Red Hat Inc 5 * 6 * Based upon 7 * linux/drivers/ide/pci/cmd640.c Version 1.02 Sep 01, 1996 8 * 9 * Copyright (C) 1995-1996 Linus Torvalds & authors (see driver) 10 * 11 * This drives only the PCI version of the controller. If you have a 12 * VLB one then we have enough docs to support it but you can write 13 * your own code. 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/module.h> 18 #include <linux/pci.h> 19 #include <linux/blkdev.h> 20 #include <linux/delay.h> 21 #include <linux/gfp.h> 22 #include <scsi/scsi_host.h> 23 #include <linux/libata.h> 24 25 #define DRV_NAME "pata_cmd640" 26 #define DRV_VERSION "0.0.5" 27 28 struct cmd640_reg { 29 int last; 30 u8 reg58[ATA_MAX_DEVICES]; 31 }; 32 33 enum { 34 CFR = 0x50, 35 CNTRL = 0x51, 36 CMDTIM = 0x52, 37 ARTIM0 = 0x53, 38 DRWTIM0 = 0x54, 39 ARTIM23 = 0x57, 40 DRWTIM23 = 0x58, 41 BRST = 0x59 42 }; 43 44 /** 45 * cmd640_set_piomode - set initial PIO mode data 46 * @ap: ATA port 47 * @adev: ATA device 48 * 49 * Called to do the PIO mode setup. 50 */ 51 52 static void cmd640_set_piomode(struct ata_port *ap, struct ata_device *adev) 53 { 54 struct cmd640_reg *timing = ap->private_data; 55 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 56 struct ata_timing t; 57 const unsigned long T = 1000000 / 33; 58 const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 }; 59 u8 reg; 60 int arttim = ARTIM0 + 2 * adev->devno; 61 struct ata_device *pair = ata_dev_pair(adev); 62 63 if (ata_timing_compute(adev, adev->pio_mode, &t, T, 0) < 0) { 64 ata_dev_err(adev, DRV_NAME ": mode computation failed.\n"); 65 return; 66 } 67 68 /* The second channel has shared timings and the setup timing is 69 messy to switch to merge it for worst case */ 70 if (ap->port_no && pair) { 71 struct ata_timing p; 72 ata_timing_compute(pair, pair->pio_mode, &p, T, 1); 73 ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP); 74 } 75 76 /* Make the timings fit */ 77 if (t.recover > 16) { 78 t.active += t.recover - 16; 79 t.recover = 16; 80 } 81 if (t.active > 16) 82 t.active = 16; 83 84 /* Now convert the clocks into values we can actually stuff into 85 the chip */ 86 87 if (t.recover > 1) 88 t.recover--; /* 640B only */ 89 else 90 t.recover = 15; 91 92 if (t.setup > 4) 93 t.setup = 0xC0; 94 else 95 t.setup = setup_data[t.setup]; 96 97 if (ap->port_no == 0) { 98 t.active &= 0x0F; /* 0 = 16 */ 99 100 /* Load setup timing */ 101 pci_read_config_byte(pdev, arttim, ®); 102 reg &= 0x3F; 103 reg |= t.setup; 104 pci_write_config_byte(pdev, arttim, reg); 105 106 /* Load active/recovery */ 107 pci_write_config_byte(pdev, arttim + 1, (t.active << 4) | t.recover); 108 } else { 109 /* Save the shared timings for channel, they will be loaded 110 by qc_issue. Reloading the setup time is expensive so we 111 keep a merged one loaded */ 112 pci_read_config_byte(pdev, ARTIM23, ®); 113 reg &= 0x3F; 114 reg |= t.setup; 115 pci_write_config_byte(pdev, ARTIM23, reg); 116 timing->reg58[adev->devno] = (t.active << 4) | t.recover; 117 } 118 } 119 120 121 /** 122 * cmd640_qc_issue - command preparation hook 123 * @qc: Command to be issued 124 * 125 * Channel 1 has shared timings. We must reprogram the 126 * clock each drive 2/3 switch we do. 127 */ 128 129 static unsigned int cmd640_qc_issue(struct ata_queued_cmd *qc) 130 { 131 struct ata_port *ap = qc->ap; 132 struct ata_device *adev = qc->dev; 133 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 134 struct cmd640_reg *timing = ap->private_data; 135 136 if (ap->port_no != 0 && adev->devno != timing->last) { 137 pci_write_config_byte(pdev, DRWTIM23, timing->reg58[adev->devno]); 138 timing->last = adev->devno; 139 } 140 return ata_sff_qc_issue(qc); 141 } 142 143 /** 144 * cmd640_port_start - port setup 145 * @ap: ATA port being set up 146 * 147 * The CMD640 needs to maintain private data structures so we 148 * allocate space here. 149 */ 150 151 static int cmd640_port_start(struct ata_port *ap) 152 { 153 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 154 struct cmd640_reg *timing; 155 156 timing = devm_kzalloc(&pdev->dev, sizeof(struct cmd640_reg), GFP_KERNEL); 157 if (timing == NULL) 158 return -ENOMEM; 159 timing->last = -1; /* Force a load */ 160 ap->private_data = timing; 161 return 0; 162 } 163 164 static bool cmd640_sff_irq_check(struct ata_port *ap) 165 { 166 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 167 int irq_reg = ap->port_no ? ARTIM23 : CFR; 168 u8 irq_stat, irq_mask = ap->port_no ? 0x10 : 0x04; 169 170 pci_read_config_byte(pdev, irq_reg, &irq_stat); 171 172 return irq_stat & irq_mask; 173 } 174 175 static const struct scsi_host_template cmd640_sht = { 176 ATA_PIO_SHT(DRV_NAME), 177 }; 178 179 static struct ata_port_operations cmd640_port_ops = { 180 .inherits = &ata_sff_port_ops, 181 /* In theory xfer_noirq is not needed once we kill the prefetcher */ 182 .sff_data_xfer = ata_sff_data_xfer32, 183 .sff_irq_check = cmd640_sff_irq_check, 184 .qc_issue = cmd640_qc_issue, 185 .cable_detect = ata_cable_40wire, 186 .set_piomode = cmd640_set_piomode, 187 .port_start = cmd640_port_start, 188 }; 189 190 static void cmd640_hardware_init(struct pci_dev *pdev) 191 { 192 u8 ctrl; 193 194 /* CMD640 detected, commiserations */ 195 pci_write_config_byte(pdev, 0x5B, 0x00); 196 /* PIO0 command cycles */ 197 pci_write_config_byte(pdev, CMDTIM, 0); 198 /* 512 byte bursts (sector) */ 199 pci_write_config_byte(pdev, BRST, 0x40); 200 /* 201 * A reporter a long time ago 202 * Had problems with the data fifo 203 * So don't run the risk 204 * Of putting crap on the disk 205 * For its better just to go slow 206 */ 207 /* Do channel 0 */ 208 pci_read_config_byte(pdev, CNTRL, &ctrl); 209 pci_write_config_byte(pdev, CNTRL, ctrl | 0xC0); 210 /* Ditto for channel 1 */ 211 pci_read_config_byte(pdev, ARTIM23, &ctrl); 212 ctrl |= 0x0C; 213 pci_write_config_byte(pdev, ARTIM23, ctrl); 214 } 215 216 static int cmd640_init_one(struct pci_dev *pdev, const struct pci_device_id *id) 217 { 218 static const struct ata_port_info info = { 219 .flags = ATA_FLAG_SLAVE_POSS, 220 .pio_mask = ATA_PIO4, 221 .port_ops = &cmd640_port_ops 222 }; 223 const struct ata_port_info *ppi[] = { &info, NULL }; 224 int rc; 225 226 rc = pcim_enable_device(pdev); 227 if (rc) 228 return rc; 229 230 cmd640_hardware_init(pdev); 231 232 return ata_pci_sff_init_one(pdev, ppi, &cmd640_sht, NULL, 0); 233 } 234 235 #ifdef CONFIG_PM_SLEEP 236 static int cmd640_reinit_one(struct pci_dev *pdev) 237 { 238 struct ata_host *host = pci_get_drvdata(pdev); 239 int rc; 240 241 rc = ata_pci_device_do_resume(pdev); 242 if (rc) 243 return rc; 244 cmd640_hardware_init(pdev); 245 ata_host_resume(host); 246 return 0; 247 } 248 #endif 249 250 static const struct pci_device_id cmd640[] = { 251 { PCI_VDEVICE(CMD, 0x640), 0 }, 252 { }, 253 }; 254 255 static struct pci_driver cmd640_pci_driver = { 256 .name = DRV_NAME, 257 .id_table = cmd640, 258 .probe = cmd640_init_one, 259 .remove = ata_pci_remove_one, 260 #ifdef CONFIG_PM_SLEEP 261 .suspend = ata_pci_device_suspend, 262 .resume = cmd640_reinit_one, 263 #endif 264 }; 265 266 module_pci_driver(cmd640_pci_driver); 267 268 MODULE_AUTHOR("Alan Cox"); 269 MODULE_DESCRIPTION("low-level driver for CMD640 PATA controllers"); 270 MODULE_LICENSE("GPL"); 271 MODULE_DEVICE_TABLE(pci, cmd640); 272 MODULE_VERSION(DRV_VERSION); 273