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Linux/drivers/ata/ahci_platform.c

  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/clk.h>
 16 #include <linux/kernel.h>
 17 #include <linux/gfp.h>
 18 #include <linux/module.h>
 19 #include <linux/pm.h>
 20 #include <linux/init.h>
 21 #include <linux/interrupt.h>
 22 #include <linux/device.h>
 23 #include <linux/platform_device.h>
 24 #include <linux/libata.h>
 25 #include <linux/ahci_platform.h>
 26 #include "ahci.h"
 27 
 28 static void ahci_host_stop(struct ata_host *host);
 29 
 30 enum ahci_type {
 31         AHCI,           /* standard platform ahci */
 32         IMX53_AHCI,     /* ahci on i.mx53 */
 33         STRICT_AHCI,    /* delayed DMA engine start */
 34 };
 35 
 36 static struct platform_device_id ahci_devtype[] = {
 37         {
 38                 .name = "ahci",
 39                 .driver_data = AHCI,
 40         }, {
 41                 .name = "imx53-ahci",
 42                 .driver_data = IMX53_AHCI,
 43         }, {
 44                 .name = "strict-ahci",
 45                 .driver_data = STRICT_AHCI,
 46         }, {
 47                 /* sentinel */
 48         }
 49 };
 50 MODULE_DEVICE_TABLE(platform, ahci_devtype);
 51 
 52 struct ata_port_operations ahci_platform_ops = {
 53         .inherits       = &ahci_ops,
 54         .host_stop      = ahci_host_stop,
 55 };
 56 EXPORT_SYMBOL_GPL(ahci_platform_ops);
 57 
 58 static struct ata_port_operations ahci_platform_retry_srst_ops = {
 59         .inherits       = &ahci_pmp_retry_srst_ops,
 60         .host_stop      = ahci_host_stop,
 61 };
 62 
 63 static const struct ata_port_info ahci_port_info[] = {
 64         /* by features */
 65         [AHCI] = {
 66                 .flags          = AHCI_FLAG_COMMON,
 67                 .pio_mask       = ATA_PIO4,
 68                 .udma_mask      = ATA_UDMA6,
 69                 .port_ops       = &ahci_platform_ops,
 70         },
 71         [IMX53_AHCI] = {
 72                 .flags          = AHCI_FLAG_COMMON,
 73                 .pio_mask       = ATA_PIO4,
 74                 .udma_mask      = ATA_UDMA6,
 75                 .port_ops       = &ahci_platform_retry_srst_ops,
 76         },
 77         [STRICT_AHCI] = {
 78                 AHCI_HFLAGS     (AHCI_HFLAG_DELAY_ENGINE),
 79                 .flags          = AHCI_FLAG_COMMON,
 80                 .pio_mask       = ATA_PIO4,
 81                 .udma_mask      = ATA_UDMA6,
 82                 .port_ops       = &ahci_platform_ops,
 83         },
 84 };
 85 
 86 static struct scsi_host_template ahci_platform_sht = {
 87         AHCI_SHT("ahci_platform"),
 88 };
 89 
 90 static int ahci_probe(struct platform_device *pdev)
 91 {
 92         struct device *dev = &pdev->dev;
 93         struct ahci_platform_data *pdata = dev_get_platdata(dev);
 94         const struct platform_device_id *id = platform_get_device_id(pdev);
 95         struct ata_port_info pi = ahci_port_info[id ? id->driver_data : 0];
 96         const struct ata_port_info *ppi[] = { &pi, NULL };
 97         struct ahci_host_priv *hpriv;
 98         struct ata_host *host;
 99         struct resource *mem;
100         int irq;
101         int n_ports;
102         int i;
103         int rc;
104 
105         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
106         if (!mem) {
107                 dev_err(dev, "no mmio space\n");
108                 return -EINVAL;
109         }
110 
111         irq = platform_get_irq(pdev, 0);
112         if (irq <= 0) {
113                 dev_err(dev, "no irq\n");
114                 return -EINVAL;
115         }
116 
117         if (pdata && pdata->ata_port_info)
118                 pi = *pdata->ata_port_info;
119 
120         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
121         if (!hpriv) {
122                 dev_err(dev, "can't alloc ahci_host_priv\n");
123                 return -ENOMEM;
124         }
125 
126         hpriv->flags |= (unsigned long)pi.private_data;
127 
128         hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
129         if (!hpriv->mmio) {
130                 dev_err(dev, "can't map %pR\n", mem);
131                 return -ENOMEM;
132         }
133 
134         hpriv->clk = clk_get(dev, NULL);
135         if (IS_ERR(hpriv->clk)) {
136                 dev_err(dev, "can't get clock\n");
137         } else {
138                 rc = clk_prepare_enable(hpriv->clk);
139                 if (rc) {
140                         dev_err(dev, "clock prepare enable failed");
141                         goto free_clk;
142                 }
143         }
144 
145         /*
146          * Some platforms might need to prepare for mmio region access,
147          * which could be done in the following init call. So, the mmio
148          * region shouldn't be accessed before init (if provided) has
149          * returned successfully.
150          */
151         if (pdata && pdata->init) {
152                 rc = pdata->init(dev, hpriv->mmio);
153                 if (rc)
154                         goto disable_unprepare_clk;
155         }
156 
157         ahci_save_initial_config(dev, hpriv,
158                 pdata ? pdata->force_port_map : 0,
159                 pdata ? pdata->mask_port_map  : 0);
160 
161         /* prepare host */
162         if (hpriv->cap & HOST_CAP_NCQ)
163                 pi.flags |= ATA_FLAG_NCQ;
164 
165         if (hpriv->cap & HOST_CAP_PMP)
166                 pi.flags |= ATA_FLAG_PMP;
167 
168         ahci_set_em_messages(hpriv, &pi);
169 
170         /* CAP.NP sometimes indicate the index of the last enabled
171          * port, at other times, that of the last possible port, so
172          * determining the maximum port number requires looking at
173          * both CAP.NP and port_map.
174          */
175         n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
176 
177         host = ata_host_alloc_pinfo(dev, ppi, n_ports);
178         if (!host) {
179                 rc = -ENOMEM;
180                 goto pdata_exit;
181         }
182 
183         host->private_data = hpriv;
184 
185         if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
186                 host->flags |= ATA_HOST_PARALLEL_SCAN;
187         else
188                 dev_info(dev, "SSS flag set, parallel bus scan disabled\n");
189 
190         if (pi.flags & ATA_FLAG_EM)
191                 ahci_reset_em(host);
192 
193         for (i = 0; i < host->n_ports; i++) {
194                 struct ata_port *ap = host->ports[i];
195 
196                 ata_port_desc(ap, "mmio %pR", mem);
197                 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
198 
199                 /* set enclosure management message type */
200                 if (ap->flags & ATA_FLAG_EM)
201                         ap->em_message_type = hpriv->em_msg_type;
202 
203                 /* disabled/not-implemented port */
204                 if (!(hpriv->port_map & (1 << i)))
205                         ap->ops = &ata_dummy_port_ops;
206         }
207 
208         rc = ahci_reset_controller(host);
209         if (rc)
210                 goto pdata_exit;
211 
212         ahci_init_controller(host);
213         ahci_print_info(host, "platform");
214 
215         rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
216                                &ahci_platform_sht);
217         if (rc)
218                 goto pdata_exit;
219 
220         return 0;
221 pdata_exit:
222         if (pdata && pdata->exit)
223                 pdata->exit(dev);
224 disable_unprepare_clk:
225         if (!IS_ERR(hpriv->clk))
226                 clk_disable_unprepare(hpriv->clk);
227 free_clk:
228         if (!IS_ERR(hpriv->clk))
229                 clk_put(hpriv->clk);
230         return rc;
231 }
232 
233 static void ahci_host_stop(struct ata_host *host)
234 {
235         struct device *dev = host->dev;
236         struct ahci_platform_data *pdata = dev_get_platdata(dev);
237         struct ahci_host_priv *hpriv = host->private_data;
238 
239         if (pdata && pdata->exit)
240                 pdata->exit(dev);
241 
242         if (!IS_ERR(hpriv->clk)) {
243                 clk_disable_unprepare(hpriv->clk);
244                 clk_put(hpriv->clk);
245         }
246 }
247 
248 #ifdef CONFIG_PM_SLEEP
249 static int ahci_suspend(struct device *dev)
250 {
251         struct ahci_platform_data *pdata = dev_get_platdata(dev);
252         struct ata_host *host = dev_get_drvdata(dev);
253         struct ahci_host_priv *hpriv = host->private_data;
254         void __iomem *mmio = hpriv->mmio;
255         u32 ctl;
256         int rc;
257 
258         if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
259                 dev_err(dev, "firmware update required for suspend/resume\n");
260                 return -EIO;
261         }
262 
263         /*
264          * AHCI spec rev1.1 section 8.3.3:
265          * Software must disable interrupts prior to requesting a
266          * transition of the HBA to D3 state.
267          */
268         ctl = readl(mmio + HOST_CTL);
269         ctl &= ~HOST_IRQ_EN;
270         writel(ctl, mmio + HOST_CTL);
271         readl(mmio + HOST_CTL); /* flush */
272 
273         rc = ata_host_suspend(host, PMSG_SUSPEND);
274         if (rc)
275                 return rc;
276 
277         if (pdata && pdata->suspend)
278                 return pdata->suspend(dev);
279 
280         if (!IS_ERR(hpriv->clk))
281                 clk_disable_unprepare(hpriv->clk);
282 
283         return 0;
284 }
285 
286 static int ahci_resume(struct device *dev)
287 {
288         struct ahci_platform_data *pdata = dev_get_platdata(dev);
289         struct ata_host *host = dev_get_drvdata(dev);
290         struct ahci_host_priv *hpriv = host->private_data;
291         int rc;
292 
293         if (!IS_ERR(hpriv->clk)) {
294                 rc = clk_prepare_enable(hpriv->clk);
295                 if (rc) {
296                         dev_err(dev, "clock prepare enable failed");
297                         return rc;
298                 }
299         }
300 
301         if (pdata && pdata->resume) {
302                 rc = pdata->resume(dev);
303                 if (rc)
304                         goto disable_unprepare_clk;
305         }
306 
307         if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
308                 rc = ahci_reset_controller(host);
309                 if (rc)
310                         goto disable_unprepare_clk;
311 
312                 ahci_init_controller(host);
313         }
314 
315         ata_host_resume(host);
316 
317         return 0;
318 
319 disable_unprepare_clk:
320         if (!IS_ERR(hpriv->clk))
321                 clk_disable_unprepare(hpriv->clk);
322 
323         return rc;
324 }
325 #endif
326 
327 static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_suspend, ahci_resume);
328 
329 static const struct of_device_id ahci_of_match[] = {
330         { .compatible = "snps,spear-ahci", },
331         { .compatible = "snps,exynos5440-ahci", },
332         { .compatible = "ibm,476gtr-ahci", },
333         {},
334 };
335 MODULE_DEVICE_TABLE(of, ahci_of_match);
336 
337 static struct platform_driver ahci_driver = {
338         .probe = ahci_probe,
339         .remove = ata_platform_remove_one,
340         .driver = {
341                 .name = "ahci",
342                 .owner = THIS_MODULE,
343                 .of_match_table = ahci_of_match,
344                 .pm = &ahci_pm_ops,
345         },
346         .id_table       = ahci_devtype,
347 };
348 module_platform_driver(ahci_driver);
349 
350 MODULE_DESCRIPTION("AHCI SATA platform driver");
351 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
352 MODULE_LICENSE("GPL");
353 MODULE_ALIAS("platform:ahci");
354 

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