1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * acard-ahci.c - ACard AHCI SATA support
6 * Maintained by: Tejun Heo <tj@kernel.org>
7 * Please ALWAYS copy linux-ide@vger.kernel.org
10 * Copyright 2010 Red Hat, Inc.
12 * libata documentation is available via 'make {ps|pdf}docs',
13 * as Documentation/driver-api/libata.rst
15 * AHCI hardware documentation:
16 * http://www.intel.com/technology/serialata/pdf/rev1_0.pdf
17 * http://www.intel.com/technology/serialata/pdf/rev1_1.pdf
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/pci.h>
23 #include <linux/blkdev.h>
24 #include <linux/delay.h>
25 #include <linux/interrupt.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/device.h>
28 #include <linux/dmi.h>
29 #include <linux/gfp.h>
30 #include <scsi/scsi_host.h>
31 #include <scsi/scsi_cmnd.h>
32 #include <linux/libata.h>
35 #define DRV_NAME "acard-ahci"
36 #define DRV_VERSION "1.0"
39 Received FIS structure limited to 80h.
42 #define ACARD_AHCI_RX_FIS_SZ 128
56 __le32 size; /* bit 31 (EOT) max==0x10000 (64k) */
59 static enum ata_completion_errors acard_ahci_qc_prep(struct ata_queued_cmd *qc);
60 static bool acard_ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
61 static int acard_ahci_port_start(struct ata_port *ap);
62 static int acard_ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
64 #ifdef CONFIG_PM_SLEEP
65 static int acard_ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
66 static int acard_ahci_pci_device_resume(struct pci_dev *pdev);
69 static struct scsi_host_template acard_ahci_sht = {
70 AHCI_SHT("acard-ahci"),
73 static struct ata_port_operations acard_ops = {
74 .inherits = &ahci_ops,
75 .qc_prep = acard_ahci_qc_prep,
76 .qc_fill_rtf = acard_ahci_qc_fill_rtf,
77 .port_start = acard_ahci_port_start,
80 #define AHCI_HFLAGS(flags) .private_data = (void *)(flags)
82 static const struct ata_port_info acard_ahci_port_info[] = {
85 AHCI_HFLAGS (AHCI_HFLAG_NO_NCQ),
86 .flags = AHCI_FLAG_COMMON,
88 .udma_mask = ATA_UDMA6,
89 .port_ops = &acard_ops,
93 static const struct pci_device_id acard_ahci_pci_tbl[] = {
95 { PCI_VDEVICE(ARTOP, 0x000d), board_acard_ahci }, /* ATP8620 */
97 { } /* terminate list */
100 static struct pci_driver acard_ahci_pci_driver = {
102 .id_table = acard_ahci_pci_tbl,
103 .probe = acard_ahci_init_one,
104 .remove = ata_pci_remove_one,
105 #ifdef CONFIG_PM_SLEEP
106 .suspend = acard_ahci_pci_device_suspend,
107 .resume = acard_ahci_pci_device_resume,
111 #ifdef CONFIG_PM_SLEEP
112 static int acard_ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
114 struct ata_host *host = pci_get_drvdata(pdev);
115 struct ahci_host_priv *hpriv = host->private_data;
116 void __iomem *mmio = hpriv->mmio;
119 if (mesg.event & PM_EVENT_SUSPEND &&
120 hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
122 "BIOS update required for suspend/resume\n");
126 if (mesg.event & PM_EVENT_SLEEP) {
127 /* AHCI spec rev1.1 section 8.3.3:
128 * Software must disable interrupts prior to requesting a
129 * transition of the HBA to D3 state.
131 ctl = readl(mmio + HOST_CTL);
133 writel(ctl, mmio + HOST_CTL);
134 readl(mmio + HOST_CTL); /* flush */
137 return ata_pci_device_suspend(pdev, mesg);
140 static int acard_ahci_pci_device_resume(struct pci_dev *pdev)
142 struct ata_host *host = pci_get_drvdata(pdev);
145 rc = ata_pci_device_do_resume(pdev);
149 if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) {
150 rc = ahci_reset_controller(host);
154 ahci_init_controller(host);
157 ata_host_resume(host);
163 static void acard_ahci_pci_print_info(struct ata_host *host)
165 struct pci_dev *pdev = to_pci_dev(host->dev);
169 pci_read_config_word(pdev, 0x0a, &cc);
170 if (cc == PCI_CLASS_STORAGE_IDE)
172 else if (cc == PCI_CLASS_STORAGE_SATA)
174 else if (cc == PCI_CLASS_STORAGE_RAID)
179 ahci_print_info(host, scc_s);
182 static unsigned int acard_ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
184 struct scatterlist *sg;
185 struct acard_sg *acard_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
186 unsigned int si, last_si = 0;
189 * Next, the S/G list.
191 for_each_sg(qc->sg, sg, qc->n_elem, si) {
192 dma_addr_t addr = sg_dma_address(sg);
193 u32 sg_len = sg_dma_len(sg);
197 * We must set an end-of-table (EOT) bit,
198 * and the segment cannot exceed 64k (0x10000)
200 acard_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
201 acard_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
202 acard_sg[si].size = cpu_to_le32(sg_len);
206 acard_sg[last_si].size |= cpu_to_le32(1 << 31); /* set EOT */
211 static enum ata_completion_errors acard_ahci_qc_prep(struct ata_queued_cmd *qc)
213 struct ata_port *ap = qc->ap;
214 struct ahci_port_priv *pp = ap->private_data;
215 int is_atapi = ata_is_atapi(qc->tf.protocol);
218 const u32 cmd_fis_len = 5; /* five dwords */
221 * Fill in command table information. First, the header,
222 * a SATA Register - Host to Device command FIS.
224 cmd_tbl = pp->cmd_tbl + qc->hw_tag * AHCI_CMD_TBL_SZ;
226 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
228 memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
229 memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
232 if (qc->flags & ATA_QCFLAG_DMAMAP)
233 acard_ahci_fill_sg(qc, cmd_tbl);
236 * Fill in command slot information.
238 * ACard note: prd table length not filled in
240 opts = cmd_fis_len | (qc->dev->link->pmp << 12);
241 if (qc->tf.flags & ATA_TFLAG_WRITE)
242 opts |= AHCI_CMD_WRITE;
244 opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
246 ahci_fill_cmd_slot(pp, qc->hw_tag, opts);
251 static bool acard_ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
253 struct ahci_port_priv *pp = qc->ap->private_data;
254 u8 *rx_fis = pp->rx_fis;
257 rx_fis += qc->dev->link->pmp * ACARD_AHCI_RX_FIS_SZ;
260 * After a successful execution of an ATA PIO data-in command,
261 * the device doesn't send D2H Reg FIS to update the TF and
262 * the host should take TF and E_Status from the preceding PIO
265 if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
266 !(qc->flags & ATA_QCFLAG_FAILED)) {
267 ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
268 qc->result_tf.status = (rx_fis + RX_FIS_PIO_SETUP)[15];
270 ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
275 static int acard_ahci_port_start(struct ata_port *ap)
277 struct ahci_host_priv *hpriv = ap->host->private_data;
278 struct device *dev = ap->host->dev;
279 struct ahci_port_priv *pp;
282 size_t dma_sz, rx_fis_sz;
284 pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
288 /* check FBS capability */
289 if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) {
290 void __iomem *port_mmio = ahci_port_base(ap);
291 u32 cmd = readl(port_mmio + PORT_CMD);
292 if (cmd & PORT_CMD_FBSCP)
293 pp->fbs_supported = true;
294 else if (hpriv->flags & AHCI_HFLAG_YES_FBS) {
295 dev_info(dev, "port %d can do FBS, forcing FBSCP\n",
297 pp->fbs_supported = true;
299 dev_warn(dev, "port %d is not capable of FBS\n",
303 if (pp->fbs_supported) {
304 dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ;
305 rx_fis_sz = ACARD_AHCI_RX_FIS_SZ * 16;
307 dma_sz = AHCI_PORT_PRIV_DMA_SZ;
308 rx_fis_sz = ACARD_AHCI_RX_FIS_SZ;
311 mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL);
316 * First item in chunk of DMA memory: 32-slot command table,
317 * 32 bytes each in size
320 pp->cmd_slot_dma = mem_dma;
322 mem += AHCI_CMD_SLOT_SZ;
323 mem_dma += AHCI_CMD_SLOT_SZ;
326 * Second item: Received-FIS area
329 pp->rx_fis_dma = mem_dma;
332 mem_dma += rx_fis_sz;
335 * Third item: data area for storing a single command
336 * and its scatter-gather table
339 pp->cmd_tbl_dma = mem_dma;
342 * Save off initial list of interrupts to be enabled.
343 * This could be changed later
345 pp->intr_mask = DEF_PORT_IRQ;
347 ap->private_data = pp;
349 /* engage engines, captain */
350 return ahci_port_resume(ap);
353 static int acard_ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
355 unsigned int board_id = ent->driver_data;
356 struct ata_port_info pi = acard_ahci_port_info[board_id];
357 const struct ata_port_info *ppi[] = { &pi, NULL };
358 struct device *dev = &pdev->dev;
359 struct ahci_host_priv *hpriv;
360 struct ata_host *host;
363 WARN_ON((int)ATA_MAX_QUEUE > AHCI_MAX_CMDS);
365 ata_print_version_once(&pdev->dev, DRV_VERSION);
367 /* acquire resources */
368 rc = pcim_enable_device(pdev);
372 /* AHCI controllers often implement SFF compatible interface.
373 * Grab all PCI BARs just in case.
375 rc = pcim_iomap_regions_request_all(pdev, 1 << AHCI_PCI_BAR, DRV_NAME);
377 pcim_pin_device(pdev);
381 hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
385 hpriv->irq = pdev->irq;
386 hpriv->flags |= (unsigned long)pi.private_data;
388 if (!(hpriv->flags & AHCI_HFLAG_NO_MSI))
389 pci_enable_msi(pdev);
391 hpriv->mmio = pcim_iomap_table(pdev)[AHCI_PCI_BAR];
393 /* save initial config */
394 ahci_save_initial_config(&pdev->dev, hpriv);
397 if (hpriv->cap & HOST_CAP_NCQ)
398 pi.flags |= ATA_FLAG_NCQ;
400 if (hpriv->cap & HOST_CAP_PMP)
401 pi.flags |= ATA_FLAG_PMP;
403 ahci_set_em_messages(hpriv, &pi);
405 /* CAP.NP sometimes indicate the index of the last enabled
406 * port, at other times, that of the last possible port, so
407 * determining the maximum port number requires looking at
408 * both CAP.NP and port_map.
410 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
412 host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
415 host->private_data = hpriv;
417 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
418 host->flags |= ATA_HOST_PARALLEL_SCAN;
420 printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");
422 for (i = 0; i < host->n_ports; i++) {
423 struct ata_port *ap = host->ports[i];
425 ata_port_pbar_desc(ap, AHCI_PCI_BAR, -1, "abar");
426 ata_port_pbar_desc(ap, AHCI_PCI_BAR,
427 0x100 + ap->port_no * 0x80, "port");
429 /* set initial link pm policy */
431 ap->pm_policy = NOT_AVAILABLE;
433 /* disabled/not-implemented port */
434 if (!(hpriv->port_map & (1 << i)))
435 ap->ops = &ata_dummy_port_ops;
438 /* initialize adapter */
439 rc = dma_set_mask_and_coherent(&pdev->dev,
440 DMA_BIT_MASK((hpriv->cap & HOST_CAP_64) ? 64 : 32));
442 dev_err(&pdev->dev, "DMA enable failed\n");
446 rc = ahci_reset_controller(host);
450 ahci_init_controller(host);
451 acard_ahci_pci_print_info(host);
453 pci_set_master(pdev);
454 return ahci_host_activate(host, &acard_ahci_sht);
457 module_pci_driver(acard_ahci_pci_driver);
459 MODULE_AUTHOR("Jeff Garzik");
460 MODULE_DESCRIPTION("ACard AHCI SATA low-level driver");
461 MODULE_LICENSE("GPL");
462 MODULE_DEVICE_TABLE(pci, acard_ahci_pci_tbl);
463 MODULE_VERSION(DRV_VERSION);