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