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