2 * AppliedMicro X-Gene SoC SATA Host Controller Driver
4 * Copyright (c) 2014, Applied Micro Circuits Corporation
5 * Author: Loc Ho <lho@apm.com>
6 * Tuan Phan <tphan@apm.com>
7 * Suman Tripathi <stripathi@apm.com>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 * NOTE: PM support is not currently available.
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
27 #include <linux/ahci_platform.h>
28 #include <linux/of_address.h>
29 #include <linux/of_irq.h>
30 #include <linux/phy/phy.h>
33 /* Max # of disk per a controller */
34 #define MAX_AHCI_CHN_PERCTR 2
37 #define SATA_ENET_CONFIG_REG 0x00000000
38 #define CFG_SATA_ENET_SELECT_MASK 0x00000001
40 /* SATA core host controller CSR */
41 #define SLVRDERRATTRIBUTES 0x00000000
42 #define SLVWRERRATTRIBUTES 0x00000004
43 #define MSTRDERRATTRIBUTES 0x00000008
44 #define MSTWRERRATTRIBUTES 0x0000000c
45 #define BUSCTLREG 0x00000014
46 #define IOFMSTRWAUX 0x00000018
47 #define INTSTATUSMASK 0x0000002c
48 #define ERRINTSTATUS 0x00000030
49 #define ERRINTSTATUSMASK 0x00000034
51 /* SATA host AHCI CSR */
52 #define PORTCFG 0x000000a4
53 #define PORTADDR_SET(dst, src) \
54 (((dst) & ~0x0000003f) | (((u32)(src)) & 0x0000003f))
55 #define PORTPHY1CFG 0x000000a8
56 #define PORTPHY1CFG_FRCPHYRDY_SET(dst, src) \
57 (((dst) & ~0x00100000) | (((u32)(src) << 0x14) & 0x00100000))
58 #define PORTPHY2CFG 0x000000ac
59 #define PORTPHY3CFG 0x000000b0
60 #define PORTPHY4CFG 0x000000b4
61 #define PORTPHY5CFG 0x000000b8
62 #define SCTL0 0x0000012C
63 #define PORTPHY5CFG_RTCHG_SET(dst, src) \
64 (((dst) & ~0xfff00000) | (((u32)(src) << 0x14) & 0xfff00000))
65 #define PORTAXICFG_EN_CONTEXT_SET(dst, src) \
66 (((dst) & ~0x01000000) | (((u32)(src) << 0x18) & 0x01000000))
67 #define PORTAXICFG 0x000000bc
68 #define PORTAXICFG_OUTTRANS_SET(dst, src) \
69 (((dst) & ~0x00f00000) | (((u32)(src) << 0x14) & 0x00f00000))
70 #define PORTRANSCFG 0x000000c8
71 #define PORTRANSCFG_RXWM_SET(dst, src) \
72 (((dst) & ~0x0000007f) | (((u32)(src)) & 0x0000007f))
74 /* SATA host controller AXI CSR */
75 #define INT_SLV_TMOMASK 0x00000010
77 /* SATA diagnostic CSR */
78 #define CFG_MEM_RAM_SHUTDOWN 0x00000070
79 #define BLOCK_MEM_RDY 0x00000074
81 /* Max retry for link down */
82 #define MAX_LINK_DOWN_RETRY 3
84 struct xgene_ahci_context {
85 struct ahci_host_priv *hpriv;
87 u8 last_cmd[MAX_AHCI_CHN_PERCTR]; /* tracking the last command issued*/
88 u32 class[MAX_AHCI_CHN_PERCTR]; /* tracking the class of device */
89 void __iomem *csr_core; /* Core CSR address of IP */
90 void __iomem *csr_diag; /* Diag CSR address of IP */
91 void __iomem *csr_axi; /* AXI CSR address of IP */
92 void __iomem *csr_mux; /* MUX CSR address of IP */
95 static int xgene_ahci_init_memram(struct xgene_ahci_context *ctx)
97 dev_dbg(ctx->dev, "Release memory from shutdown\n");
98 writel(0x0, ctx->csr_diag + CFG_MEM_RAM_SHUTDOWN);
99 readl(ctx->csr_diag + CFG_MEM_RAM_SHUTDOWN); /* Force a barrier */
100 msleep(1); /* reset may take up to 1ms */
101 if (readl(ctx->csr_diag + BLOCK_MEM_RDY) != 0xFFFFFFFF) {
102 dev_err(ctx->dev, "failed to release memory from shutdown\n");
109 * xgene_ahci_poll_reg_val- Poll a register on a specific value.
110 * @ap : ATA port of interest.
111 * @reg : Register of interest.
112 * @val : Value to be attained.
113 * @interval : waiting interval for polling.
114 * @timeout : timeout for achieving the value.
116 static int xgene_ahci_poll_reg_val(struct ata_port *ap,
117 void __iomem *reg, unsigned
118 int val, unsigned long interval,
119 unsigned long timeout)
121 unsigned long deadline;
125 deadline = ata_deadline(jiffies, timeout);
127 while (tmp != val && time_before(jiffies, deadline)) {
128 ata_msleep(ap, interval);
136 * xgene_ahci_restart_engine - Restart the dma engine.
137 * @ap : ATA port of interest
139 * Waits for completion of multiple commands and restarts
140 * the DMA engine inside the controller.
142 static int xgene_ahci_restart_engine(struct ata_port *ap)
144 struct ahci_host_priv *hpriv = ap->host->private_data;
145 struct ahci_port_priv *pp = ap->private_data;
146 void __iomem *port_mmio = ahci_port_base(ap);
150 * In case of PMP multiple IDENTIFY DEVICE commands can be
151 * issued inside PxCI. So need to poll PxCI for the
152 * completion of outstanding IDENTIFY DEVICE commands before
153 * we restart the DMA engine.
155 if (xgene_ahci_poll_reg_val(ap, port_mmio +
156 PORT_CMD_ISSUE, 0x0, 1, 100))
159 ahci_stop_engine(ap);
160 ahci_start_fis_rx(ap);
163 * Enable the PxFBS.FBS_EN bit as it
164 * gets cleared due to stopping the engine.
166 if (pp->fbs_supported) {
167 fbs = readl(port_mmio + PORT_FBS);
168 writel(fbs | PORT_FBS_EN, port_mmio + PORT_FBS);
169 fbs = readl(port_mmio + PORT_FBS);
172 hpriv->start_engine(ap);
178 * xgene_ahci_qc_issue - Issue commands to the device
179 * @qc: Command to issue
181 * Due to Hardware errata for IDENTIFY DEVICE command, the controller cannot
182 * clear the BSY bit after receiving the PIO setup FIS. This results in the dma
183 * state machine goes into the CMFatalErrorUpdate state and locks up. By
184 * restarting the dma engine, it removes the controller out of lock up state.
186 * Due to H/W errata, the controller is unable to save the PMP
187 * field fetched from command header before sending the H2D FIS.
188 * When the device returns the PMP port field in the D2H FIS, there is
189 * a mismatch and results in command completion failure. The
190 * workaround is to write the pmp value to PxFBS.DEV field before issuing
191 * any command to PMP.
193 static unsigned int xgene_ahci_qc_issue(struct ata_queued_cmd *qc)
195 struct ata_port *ap = qc->ap;
196 struct ahci_host_priv *hpriv = ap->host->private_data;
197 struct xgene_ahci_context *ctx = hpriv->plat_data;
200 void *port_mmio = ahci_port_base(ap);
203 * Write the pmp value to PxFBS.DEV
204 * for case of Port Mulitplier.
206 if (ctx->class[ap->port_no] == ATA_DEV_PMP) {
207 port_fbs = readl(port_mmio + PORT_FBS);
208 port_fbs &= ~PORT_FBS_DEV_MASK;
209 port_fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET;
210 writel(port_fbs, port_mmio + PORT_FBS);
213 if (unlikely((ctx->last_cmd[ap->port_no] == ATA_CMD_ID_ATA) ||
214 (ctx->last_cmd[ap->port_no] == ATA_CMD_PACKET)))
215 xgene_ahci_restart_engine(ap);
217 rc = ahci_qc_issue(qc);
219 /* Save the last command issued */
220 ctx->last_cmd[ap->port_no] = qc->tf.command;
225 static bool xgene_ahci_is_memram_inited(struct xgene_ahci_context *ctx)
227 void __iomem *diagcsr = ctx->csr_diag;
229 return (readl(diagcsr + CFG_MEM_RAM_SHUTDOWN) == 0 &&
230 readl(diagcsr + BLOCK_MEM_RDY) == 0xFFFFFFFF);
234 * xgene_ahci_read_id - Read ID data from the specified device
236 * @tf: proposed taskfile
239 * This custom read ID function is required due to the fact that the HW
240 * does not support DEVSLP.
242 static unsigned int xgene_ahci_read_id(struct ata_device *dev,
243 struct ata_taskfile *tf, u16 *id)
247 err_mask = ata_do_dev_read_id(dev, tf, id);
252 * Mask reserved area. Word78 spec of Link Power Management
254 * bit7: NCQ autosence
255 * bit6: Software settings preservation supported
257 * bit4: In-order sata delivery supported
258 * bit3: DIPM requests supported
259 * bit2: DMA Setup FIS Auto-Activate optimization supported
260 * bit1: DMA Setup FIX non-Zero buffer offsets supported
263 * Clear reserved bit 8 (DEVSLP bit) as we don't support DEVSLP
265 id[ATA_ID_FEATURE_SUPP] &= cpu_to_le16(~(1 << 8));
270 static void xgene_ahci_set_phy_cfg(struct xgene_ahci_context *ctx, int channel)
272 void __iomem *mmio = ctx->hpriv->mmio;
275 dev_dbg(ctx->dev, "port configure mmio 0x%p channel %d\n",
277 val = readl(mmio + PORTCFG);
278 val = PORTADDR_SET(val, channel == 0 ? 2 : 3);
279 writel(val, mmio + PORTCFG);
280 readl(mmio + PORTCFG); /* Force a barrier */
281 /* Disable fix rate */
282 writel(0x0001fffe, mmio + PORTPHY1CFG);
283 readl(mmio + PORTPHY1CFG); /* Force a barrier */
284 writel(0x28183219, mmio + PORTPHY2CFG);
285 readl(mmio + PORTPHY2CFG); /* Force a barrier */
286 writel(0x13081008, mmio + PORTPHY3CFG);
287 readl(mmio + PORTPHY3CFG); /* Force a barrier */
288 writel(0x00480815, mmio + PORTPHY4CFG);
289 readl(mmio + PORTPHY4CFG); /* Force a barrier */
290 /* Set window negotiation */
291 val = readl(mmio + PORTPHY5CFG);
292 val = PORTPHY5CFG_RTCHG_SET(val, 0x300);
293 writel(val, mmio + PORTPHY5CFG);
294 readl(mmio + PORTPHY5CFG); /* Force a barrier */
295 val = readl(mmio + PORTAXICFG);
296 val = PORTAXICFG_EN_CONTEXT_SET(val, 0x1); /* Enable context mgmt */
297 val = PORTAXICFG_OUTTRANS_SET(val, 0xe); /* Set outstanding */
298 writel(val, mmio + PORTAXICFG);
299 readl(mmio + PORTAXICFG); /* Force a barrier */
300 /* Set the watermark threshold of the receive FIFO */
301 val = readl(mmio + PORTRANSCFG);
302 val = PORTRANSCFG_RXWM_SET(val, 0x30);
303 writel(val, mmio + PORTRANSCFG);
307 * xgene_ahci_do_hardreset - Issue the actual COMRESET
308 * @link: link to reset
309 * @deadline: deadline jiffies for the operation
310 * @online: Return value to indicate if device online
312 * Due to the limitation of the hardware PHY, a difference set of setting is
313 * required for each supported disk speed - Gen3 (6.0Gbps), Gen2 (3.0Gbps),
314 * and Gen1 (1.5Gbps). Otherwise during long IO stress test, the PHY will
315 * report disparity error and etc. In addition, during COMRESET, there can
316 * be error reported in the register PORT_SCR_ERR. For SERR_DISPARITY and
317 * SERR_10B_8B_ERR, the PHY receiver line must be reseted. Also during long
318 * reboot cycle regression, sometimes the PHY reports link down even if the
319 * device is present because of speed negotiation failure. so need to retry
320 * the COMRESET to get the link up. The following algorithm is followed to
321 * proper configure the hardware PHY during COMRESET:
324 * 1. Start the PHY at Gen3 speed (default setting)
325 * 2. Issue the COMRESET
326 * 3. If no link, go to Alg Part 3
327 * 4. If link up, determine if the negotiated speed matches the PHY
329 * 5. If they matched, go to Alg Part 2
330 * 6. If they do not matched and first time, configure the PHY for the linked
331 * up disk speed and repeat step 2
332 * 7. Go to Alg Part 2
335 * 1. On link up, if there are any SERR_DISPARITY and SERR_10B_8B_ERR error
336 * reported in the register PORT_SCR_ERR, then reset the PHY receiver line
337 * 2. Go to Alg Part 4
340 * 1. Check the PORT_SCR_STAT to see whether device presence detected but PHY
341 * communication establishment failed and maximum link down attempts are
342 * less than Max attempts 3 then goto Alg Part 1.
343 * 2. Go to Alg Part 4.
346 * 1. Clear any pending from register PORT_SCR_ERR.
348 * NOTE: For the initial version, we will NOT support Gen1/Gen2. In addition
349 * and until the underlying PHY supports an method to reset the receiver
350 * line, on detection of SERR_DISPARITY or SERR_10B_8B_ERR errors,
351 * an warning message will be printed.
353 static int xgene_ahci_do_hardreset(struct ata_link *link,
354 unsigned long deadline, bool *online)
356 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
357 struct ata_port *ap = link->ap;
358 struct ahci_host_priv *hpriv = ap->host->private_data;
359 struct xgene_ahci_context *ctx = hpriv->plat_data;
360 struct ahci_port_priv *pp = ap->private_data;
361 u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
362 void __iomem *port_mmio = ahci_port_base(ap);
363 struct ata_taskfile tf;
364 int link_down_retry = 0;
369 /* clear D2H reception area to properly wait for D2H FIS */
370 ata_tf_init(link->device, &tf);
371 tf.command = ATA_BUSY;
372 ata_tf_to_fis(&tf, 0, 0, d2h_fis);
373 rc = sata_link_hardreset(link, timing, deadline, online,
376 val = readl(port_mmio + PORT_SCR_ERR);
377 if (val & (SERR_DISPARITY | SERR_10B_8B_ERR))
378 dev_warn(ctx->dev, "link has error\n");
382 sata_scr_read(link, SCR_STATUS, &sstatus);
383 } while (link_down_retry++ < MAX_LINK_DOWN_RETRY &&
384 (sstatus & 0xff) == 0x1);
386 /* clear all errors if any pending */
387 val = readl(port_mmio + PORT_SCR_ERR);
388 writel(val, port_mmio + PORT_SCR_ERR);
393 static int xgene_ahci_hardreset(struct ata_link *link, unsigned int *class,
394 unsigned long deadline)
396 struct ata_port *ap = link->ap;
397 struct ahci_host_priv *hpriv = ap->host->private_data;
398 void __iomem *port_mmio = ahci_port_base(ap);
405 u32 portrxfishi_saved;
407 /* As hardreset resets these CSR, save it to restore later */
408 portcmd_saved = readl(port_mmio + PORT_CMD);
409 portclb_saved = readl(port_mmio + PORT_LST_ADDR);
410 portclbhi_saved = readl(port_mmio + PORT_LST_ADDR_HI);
411 portrxfis_saved = readl(port_mmio + PORT_FIS_ADDR);
412 portrxfishi_saved = readl(port_mmio + PORT_FIS_ADDR_HI);
414 ahci_stop_engine(ap);
416 rc = xgene_ahci_do_hardreset(link, deadline, &online);
418 /* As controller hardreset clears them, restore them */
419 writel(portcmd_saved, port_mmio + PORT_CMD);
420 writel(portclb_saved, port_mmio + PORT_LST_ADDR);
421 writel(portclbhi_saved, port_mmio + PORT_LST_ADDR_HI);
422 writel(portrxfis_saved, port_mmio + PORT_FIS_ADDR);
423 writel(portrxfishi_saved, port_mmio + PORT_FIS_ADDR_HI);
425 hpriv->start_engine(ap);
428 *class = ahci_dev_classify(ap);
433 static void xgene_ahci_host_stop(struct ata_host *host)
435 struct ahci_host_priv *hpriv = host->private_data;
437 ahci_platform_disable_resources(hpriv);
441 * xgene_ahci_pmp_softreset - Issue the softreset to the drives connected
442 * to Port Multiplier.
443 * @link: link to reset
444 * @class: Return value to indicate class of device
445 * @deadline: deadline jiffies for the operation
447 * Due to H/W errata, the controller is unable to save the PMP
448 * field fetched from command header before sending the H2D FIS.
449 * When the device returns the PMP port field in the D2H FIS, there is
450 * a mismatch and results in command completion failure. The workaround
451 * is to write the pmp value to PxFBS.DEV field before issuing any command
454 static int xgene_ahci_pmp_softreset(struct ata_link *link, unsigned int *class,
455 unsigned long deadline)
457 int pmp = sata_srst_pmp(link);
458 struct ata_port *ap = link->ap;
460 void *port_mmio = ahci_port_base(ap);
464 * Set PxFBS.DEV field with pmp
467 port_fbs = readl(port_mmio + PORT_FBS);
468 port_fbs &= ~PORT_FBS_DEV_MASK;
469 port_fbs |= pmp << PORT_FBS_DEV_OFFSET;
470 writel(port_fbs, port_mmio + PORT_FBS);
472 rc = ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
478 * xgene_ahci_softreset - Issue the softreset to the drive.
479 * @link: link to reset
480 * @class: Return value to indicate class of device
481 * @deadline: deadline jiffies for the operation
483 * Due to H/W errata, the controller is unable to save the PMP
484 * field fetched from command header before sending the H2D FIS.
485 * When the device returns the PMP port field in the D2H FIS, there is
486 * a mismatch and results in command completion failure. The workaround
487 * is to write the pmp value to PxFBS.DEV field before issuing any command
488 * to PMP. Here is the algorithm to detect PMP :
490 * 1. Save the PxFBS value
491 * 2. Program PxFBS.DEV with pmp value send by framework. Framework sends
492 * 0xF for both PMP/NON-PMP initially
494 * 4. If signature class is PMP goto 6
495 * 5. restore the original PxFBS and goto 3
498 static int xgene_ahci_softreset(struct ata_link *link, unsigned int *class,
499 unsigned long deadline)
501 int pmp = sata_srst_pmp(link);
502 struct ata_port *ap = link->ap;
503 struct ahci_host_priv *hpriv = ap->host->private_data;
504 struct xgene_ahci_context *ctx = hpriv->plat_data;
505 void *port_mmio = ahci_port_base(ap);
511 port_fbs_save = readl(port_mmio + PORT_FBS);
514 * Set PxFBS.DEV field with pmp
517 port_fbs = readl(port_mmio + PORT_FBS);
518 port_fbs &= ~PORT_FBS_DEV_MASK;
519 port_fbs |= pmp << PORT_FBS_DEV_OFFSET;
520 writel(port_fbs, port_mmio + PORT_FBS);
523 rc = ahci_do_softreset(link, class, pmp,
524 deadline, ahci_check_ready);
526 ctx->class[ap->port_no] = *class;
527 if (*class != ATA_DEV_PMP) {
529 * Retry for normal drives without
530 * setting PxFBS.DEV field with pmp value.
533 writel(port_fbs_save, port_mmio + PORT_FBS);
534 goto softreset_retry;
541 static struct ata_port_operations xgene_ahci_ops = {
542 .inherits = &ahci_ops,
543 .host_stop = xgene_ahci_host_stop,
544 .hardreset = xgene_ahci_hardreset,
545 .read_id = xgene_ahci_read_id,
546 .qc_issue = xgene_ahci_qc_issue,
547 .softreset = xgene_ahci_softreset,
548 .pmp_softreset = xgene_ahci_pmp_softreset
551 static const struct ata_port_info xgene_ahci_port_info = {
552 .flags = AHCI_FLAG_COMMON | ATA_FLAG_PMP,
553 .pio_mask = ATA_PIO4,
554 .udma_mask = ATA_UDMA6,
555 .port_ops = &xgene_ahci_ops,
558 static int xgene_ahci_hw_init(struct ahci_host_priv *hpriv)
560 struct xgene_ahci_context *ctx = hpriv->plat_data;
565 /* Remove IP RAM out of shutdown */
566 rc = xgene_ahci_init_memram(ctx);
570 for (i = 0; i < MAX_AHCI_CHN_PERCTR; i++)
571 xgene_ahci_set_phy_cfg(ctx, i);
573 /* AXI disable Mask */
574 writel(0xffffffff, hpriv->mmio + HOST_IRQ_STAT);
575 readl(hpriv->mmio + HOST_IRQ_STAT); /* Force a barrier */
576 writel(0, ctx->csr_core + INTSTATUSMASK);
577 val = readl(ctx->csr_core + INTSTATUSMASK); /* Force a barrier */
578 dev_dbg(ctx->dev, "top level interrupt mask 0x%X value 0x%08X\n",
581 writel(0x0, ctx->csr_core + ERRINTSTATUSMASK);
582 readl(ctx->csr_core + ERRINTSTATUSMASK); /* Force a barrier */
583 writel(0x0, ctx->csr_axi + INT_SLV_TMOMASK);
584 readl(ctx->csr_axi + INT_SLV_TMOMASK);
586 /* Enable AXI Interrupt */
587 writel(0xffffffff, ctx->csr_core + SLVRDERRATTRIBUTES);
588 writel(0xffffffff, ctx->csr_core + SLVWRERRATTRIBUTES);
589 writel(0xffffffff, ctx->csr_core + MSTRDERRATTRIBUTES);
590 writel(0xffffffff, ctx->csr_core + MSTWRERRATTRIBUTES);
592 /* Enable coherency */
593 val = readl(ctx->csr_core + BUSCTLREG);
594 val &= ~0x00000002; /* Enable write coherency */
595 val &= ~0x00000001; /* Enable read coherency */
596 writel(val, ctx->csr_core + BUSCTLREG);
598 val = readl(ctx->csr_core + IOFMSTRWAUX);
599 val |= (1 << 3); /* Enable read coherency */
600 val |= (1 << 9); /* Enable write coherency */
601 writel(val, ctx->csr_core + IOFMSTRWAUX);
602 val = readl(ctx->csr_core + IOFMSTRWAUX);
603 dev_dbg(ctx->dev, "coherency 0x%X value 0x%08X\n",
609 static int xgene_ahci_mux_select(struct xgene_ahci_context *ctx)
613 /* Check for optional MUX resource */
617 val = readl(ctx->csr_mux + SATA_ENET_CONFIG_REG);
618 val &= ~CFG_SATA_ENET_SELECT_MASK;
619 writel(val, ctx->csr_mux + SATA_ENET_CONFIG_REG);
620 val = readl(ctx->csr_mux + SATA_ENET_CONFIG_REG);
621 return val & CFG_SATA_ENET_SELECT_MASK ? -1 : 0;
624 static int xgene_ahci_probe(struct platform_device *pdev)
626 struct device *dev = &pdev->dev;
627 struct ahci_host_priv *hpriv;
628 struct xgene_ahci_context *ctx;
629 struct resource *res;
632 hpriv = ahci_platform_get_resources(pdev);
634 return PTR_ERR(hpriv);
636 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
640 hpriv->plat_data = ctx;
644 /* Retrieve the IP core resource */
645 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
646 ctx->csr_core = devm_ioremap_resource(dev, res);
647 if (IS_ERR(ctx->csr_core))
648 return PTR_ERR(ctx->csr_core);
650 /* Retrieve the IP diagnostic resource */
651 res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
652 ctx->csr_diag = devm_ioremap_resource(dev, res);
653 if (IS_ERR(ctx->csr_diag))
654 return PTR_ERR(ctx->csr_diag);
656 /* Retrieve the IP AXI resource */
657 res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
658 ctx->csr_axi = devm_ioremap_resource(dev, res);
659 if (IS_ERR(ctx->csr_axi))
660 return PTR_ERR(ctx->csr_axi);
662 /* Retrieve the optional IP mux resource */
663 res = platform_get_resource(pdev, IORESOURCE_MEM, 4);
665 void __iomem *csr = devm_ioremap_resource(dev, res);
672 dev_dbg(dev, "VAddr 0x%p Mmio VAddr 0x%p\n", ctx->csr_core,
676 if ((rc = xgene_ahci_mux_select(ctx))) {
677 dev_err(dev, "SATA mux selection failed error %d\n", rc);
681 if (xgene_ahci_is_memram_inited(ctx)) {
682 dev_info(dev, "skip clock and PHY initialization\n");
686 /* Due to errata, HW requires full toggle transition */
687 rc = ahci_platform_enable_clks(hpriv);
689 goto disable_resources;
690 ahci_platform_disable_clks(hpriv);
692 rc = ahci_platform_enable_resources(hpriv);
694 goto disable_resources;
696 /* Configure the host controller */
697 xgene_ahci_hw_init(hpriv);
699 hpriv->flags = AHCI_HFLAG_NO_PMP | AHCI_HFLAG_NO_NCQ;
701 rc = ahci_platform_init_host(pdev, hpriv, &xgene_ahci_port_info);
703 goto disable_resources;
705 dev_dbg(dev, "X-Gene SATA host controller initialized\n");
709 ahci_platform_disable_resources(hpriv);
713 static const struct of_device_id xgene_ahci_of_match[] = {
714 {.compatible = "apm,xgene-ahci"},
717 MODULE_DEVICE_TABLE(of, xgene_ahci_of_match);
719 static struct platform_driver xgene_ahci_driver = {
720 .probe = xgene_ahci_probe,
721 .remove = ata_platform_remove_one,
723 .name = "xgene-ahci",
724 .of_match_table = xgene_ahci_of_match,
728 module_platform_driver(xgene_ahci_driver);
730 MODULE_DESCRIPTION("APM X-Gene AHCI SATA driver");
731 MODULE_AUTHOR("Loc Ho <lho@apm.com>");
732 MODULE_LICENSE("GPL");
733 MODULE_VERSION("0.4");