1 /* 2 * AHCI SATA platform driver 3 * 4 * Copyright 2004-2005 Red Hat, Inc. 5 * Jeff Garzik <jgarzik@pobox.com> 6 * Copyright 2010 MontaVista Software, LLC. 7 * Anton Vorontsov <avorontsov@ru.mvista.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2, or (at your option) 12 * any later version. 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/gfp.h> 17 #include <linux/module.h> 18 #include <linux/init.h> 19 #include <linux/interrupt.h> 20 #include <linux/device.h> 21 #include <linux/platform_device.h> 22 #include <linux/libata.h> 23 #include <linux/ahci_platform.h> 24 #include "ahci.h" 25 26 enum ahci_type { 27 AHCI, /* standard platform ahci */ 28 IMX53_AHCI, /* ahci on i.mx53 */ 29 STRICT_AHCI, /* delayed DMA engine start */ 30 }; 31 32 static struct platform_device_id ahci_devtype[] = { 33 { 34 .name = "ahci", 35 .driver_data = AHCI, 36 }, { 37 .name = "imx53-ahci", 38 .driver_data = IMX53_AHCI, 39 }, { 40 .name = "strict-ahci", 41 .driver_data = STRICT_AHCI, 42 }, { 43 /* sentinel */ 44 } 45 }; 46 MODULE_DEVICE_TABLE(platform, ahci_devtype); 47 48 49 static const struct ata_port_info ahci_port_info[] = { 50 /* by features */ 51 [AHCI] = { 52 .flags = AHCI_FLAG_COMMON, 53 .pio_mask = ATA_PIO4, 54 .udma_mask = ATA_UDMA6, 55 .port_ops = &ahci_ops, 56 }, 57 [IMX53_AHCI] = { 58 .flags = AHCI_FLAG_COMMON, 59 .pio_mask = ATA_PIO4, 60 .udma_mask = ATA_UDMA6, 61 .port_ops = &ahci_pmp_retry_srst_ops, 62 }, 63 [STRICT_AHCI] = { 64 AHCI_HFLAGS (AHCI_HFLAG_DELAY_ENGINE), 65 .flags = AHCI_FLAG_COMMON, 66 .pio_mask = ATA_PIO4, 67 .udma_mask = ATA_UDMA6, 68 .port_ops = &ahci_ops, 69 }, 70 }; 71 72 static struct scsi_host_template ahci_platform_sht = { 73 AHCI_SHT("ahci_platform"), 74 }; 75 76 static int __init ahci_probe(struct platform_device *pdev) 77 { 78 struct device *dev = &pdev->dev; 79 struct ahci_platform_data *pdata = dev_get_platdata(dev); 80 const struct platform_device_id *id = platform_get_device_id(pdev); 81 struct ata_port_info pi = ahci_port_info[id ? id->driver_data : 0]; 82 const struct ata_port_info *ppi[] = { &pi, NULL }; 83 struct ahci_host_priv *hpriv; 84 struct ata_host *host; 85 struct resource *mem; 86 int irq; 87 int n_ports; 88 int i; 89 int rc; 90 91 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 92 if (!mem) { 93 dev_err(dev, "no mmio space\n"); 94 return -EINVAL; 95 } 96 97 irq = platform_get_irq(pdev, 0); 98 if (irq <= 0) { 99 dev_err(dev, "no irq\n"); 100 return -EINVAL; 101 } 102 103 if (pdata && pdata->ata_port_info) 104 pi = *pdata->ata_port_info; 105 106 hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL); 107 if (!hpriv) { 108 dev_err(dev, "can't alloc ahci_host_priv\n"); 109 return -ENOMEM; 110 } 111 112 hpriv->flags |= (unsigned long)pi.private_data; 113 114 hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem)); 115 if (!hpriv->mmio) { 116 dev_err(dev, "can't map %pR\n", mem); 117 return -ENOMEM; 118 } 119 120 /* 121 * Some platforms might need to prepare for mmio region access, 122 * which could be done in the following init call. So, the mmio 123 * region shouldn't be accessed before init (if provided) has 124 * returned successfully. 125 */ 126 if (pdata && pdata->init) { 127 rc = pdata->init(dev, hpriv->mmio); 128 if (rc) 129 return rc; 130 } 131 132 ahci_save_initial_config(dev, hpriv, 133 pdata ? pdata->force_port_map : 0, 134 pdata ? pdata->mask_port_map : 0); 135 136 /* prepare host */ 137 if (hpriv->cap & HOST_CAP_NCQ) 138 pi.flags |= ATA_FLAG_NCQ; 139 140 if (hpriv->cap & HOST_CAP_PMP) 141 pi.flags |= ATA_FLAG_PMP; 142 143 ahci_set_em_messages(hpriv, &pi); 144 145 /* CAP.NP sometimes indicate the index of the last enabled 146 * port, at other times, that of the last possible port, so 147 * determining the maximum port number requires looking at 148 * both CAP.NP and port_map. 149 */ 150 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); 151 152 host = ata_host_alloc_pinfo(dev, ppi, n_ports); 153 if (!host) { 154 rc = -ENOMEM; 155 goto err0; 156 } 157 158 host->private_data = hpriv; 159 160 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) 161 host->flags |= ATA_HOST_PARALLEL_SCAN; 162 else 163 printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n"); 164 165 if (pi.flags & ATA_FLAG_EM) 166 ahci_reset_em(host); 167 168 for (i = 0; i < host->n_ports; i++) { 169 struct ata_port *ap = host->ports[i]; 170 171 ata_port_desc(ap, "mmio %pR", mem); 172 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); 173 174 /* set enclosure management message type */ 175 if (ap->flags & ATA_FLAG_EM) 176 ap->em_message_type = hpriv->em_msg_type; 177 178 /* disabled/not-implemented port */ 179 if (!(hpriv->port_map & (1 << i))) 180 ap->ops = &ata_dummy_port_ops; 181 } 182 183 rc = ahci_reset_controller(host); 184 if (rc) 185 goto err0; 186 187 ahci_init_controller(host); 188 ahci_print_info(host, "platform"); 189 190 rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED, 191 &ahci_platform_sht); 192 if (rc) 193 goto err0; 194 195 return 0; 196 err0: 197 if (pdata && pdata->exit) 198 pdata->exit(dev); 199 return rc; 200 } 201 202 static int __devexit ahci_remove(struct platform_device *pdev) 203 { 204 struct device *dev = &pdev->dev; 205 struct ahci_platform_data *pdata = dev_get_platdata(dev); 206 struct ata_host *host = dev_get_drvdata(dev); 207 208 ata_host_detach(host); 209 210 if (pdata && pdata->exit) 211 pdata->exit(dev); 212 213 return 0; 214 } 215 216 #ifdef CONFIG_PM 217 static int ahci_suspend(struct device *dev) 218 { 219 struct ahci_platform_data *pdata = dev_get_platdata(dev); 220 struct ata_host *host = dev_get_drvdata(dev); 221 struct ahci_host_priv *hpriv = host->private_data; 222 void __iomem *mmio = hpriv->mmio; 223 u32 ctl; 224 int rc; 225 226 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { 227 dev_err(dev, "firmware update required for suspend/resume\n"); 228 return -EIO; 229 } 230 231 /* 232 * AHCI spec rev1.1 section 8.3.3: 233 * Software must disable interrupts prior to requesting a 234 * transition of the HBA to D3 state. 235 */ 236 ctl = readl(mmio + HOST_CTL); 237 ctl &= ~HOST_IRQ_EN; 238 writel(ctl, mmio + HOST_CTL); 239 readl(mmio + HOST_CTL); /* flush */ 240 241 rc = ata_host_suspend(host, PMSG_SUSPEND); 242 if (rc) 243 return rc; 244 245 if (pdata && pdata->suspend) 246 return pdata->suspend(dev); 247 return 0; 248 } 249 250 static int ahci_resume(struct device *dev) 251 { 252 struct ahci_platform_data *pdata = dev_get_platdata(dev); 253 struct ata_host *host = dev_get_drvdata(dev); 254 int rc; 255 256 if (pdata && pdata->resume) { 257 rc = pdata->resume(dev); 258 if (rc) 259 return rc; 260 } 261 262 if (dev->power.power_state.event == PM_EVENT_SUSPEND) { 263 rc = ahci_reset_controller(host); 264 if (rc) 265 return rc; 266 267 ahci_init_controller(host); 268 } 269 270 ata_host_resume(host); 271 272 return 0; 273 } 274 275 static struct dev_pm_ops ahci_pm_ops = { 276 .suspend = &ahci_suspend, 277 .resume = &ahci_resume, 278 }; 279 #endif 280 281 static const struct of_device_id ahci_of_match[] = { 282 { .compatible = "calxeda,hb-ahci", }, 283 { .compatible = "snps,spear-ahci", }, 284 {}, 285 }; 286 MODULE_DEVICE_TABLE(of, ahci_of_match); 287 288 static struct platform_driver ahci_driver = { 289 .remove = __devexit_p(ahci_remove), 290 .driver = { 291 .name = "ahci", 292 .owner = THIS_MODULE, 293 .of_match_table = ahci_of_match, 294 #ifdef CONFIG_PM 295 .pm = &ahci_pm_ops, 296 #endif 297 }, 298 .id_table = ahci_devtype, 299 }; 300 301 static int __init ahci_init(void) 302 { 303 return platform_driver_probe(&ahci_driver, ahci_probe); 304 } 305 module_init(ahci_init); 306 307 static void __exit ahci_exit(void) 308 { 309 platform_driver_unregister(&ahci_driver); 310 } 311 module_exit(ahci_exit); 312 313 MODULE_DESCRIPTION("AHCI SATA platform driver"); 314 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); 315 MODULE_LICENSE("GPL"); 316 MODULE_ALIAS("platform:ahci"); 317