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openvswitch: actions: use skb_postpull_rcsum when possible
[linux-2.6/btrfs-unstable.git] / drivers / ata / ahci_imx.c
blobf3970b4ed889e9abbeafae96f8bdff69d77fcd00
1 /*
2 * copyright (c) 2013 Freescale Semiconductor, Inc.
3 * Freescale IMX AHCI SATA platform driver
4 *
5 * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <linux/regmap.h>
24 #include <linux/ahci_platform.h>
25 #include <linux/of_device.h>
26 #include <linux/mfd/syscon.h>
27 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
28 #include <linux/libata.h>
29 #include "ahci.h"
30
31 enum {
32 /* Timer 1-ms Register */
33 IMX_TIMER1MS = 0x00e0,
34 /* Port0 PHY Control Register */
35 IMX_P0PHYCR = 0x0178,
36 IMX_P0PHYCR_TEST_PDDQ = 1 << 20,
37 IMX_P0PHYCR_CR_READ = 1 << 19,
38 IMX_P0PHYCR_CR_WRITE = 1 << 18,
39 IMX_P0PHYCR_CR_CAP_DATA = 1 << 17,
40 IMX_P0PHYCR_CR_CAP_ADDR = 1 << 16,
41 /* Port0 PHY Status Register */
42 IMX_P0PHYSR = 0x017c,
43 IMX_P0PHYSR_CR_ACK = 1 << 18,
44 IMX_P0PHYSR_CR_DATA_OUT = 0xffff << 0,
45 /* Lane0 Output Status Register */
46 IMX_LANE0_OUT_STAT = 0x2003,
47 IMX_LANE0_OUT_STAT_RX_PLL_STATE = 1 << 1,
48 /* Clock Reset Register */
49 IMX_CLOCK_RESET = 0x7f3f,
50 IMX_CLOCK_RESET_RESET = 1 << 0,
51 };
52
53 enum ahci_imx_type {
54 AHCI_IMX53,
55 AHCI_IMX6Q,
56 };
57
58 struct imx_ahci_priv {
59 struct platform_device *ahci_pdev;
60 enum ahci_imx_type type;
61 struct clk *sata_clk;
62 struct clk *sata_ref_clk;
63 struct clk *ahb_clk;
64 struct regmap *gpr;
65 bool no_device;
66 bool first_time;
67 u32 phy_params;
68 };
69
70 static int ahci_imx_hotplug;
71 module_param_named(hotplug, ahci_imx_hotplug, int, 0644);
72 MODULE_PARM_DESC(hotplug, "AHCI IMX hot-plug support (0=Don't support, 1=support)");
73
74 static void ahci_imx_host_stop(struct ata_host *host);
75
76 static int imx_phy_crbit_assert(void __iomem *mmio, u32 bit, bool assert)
77 {
78 int timeout = 10;
79 u32 crval;
80 u32 srval;
81
82 /* Assert or deassert the bit */
83 crval = readl(mmio + IMX_P0PHYCR);
84 if (assert)
85 crval |= bit;
86 else
87 crval &= ~bit;
88 writel(crval, mmio + IMX_P0PHYCR);
89
90 /* Wait for the cr_ack signal */
91 do {
92 srval = readl(mmio + IMX_P0PHYSR);
93 if ((assert ? srval : ~srval) & IMX_P0PHYSR_CR_ACK)
94 break;
95 usleep_range(100, 200);
96 } while (--timeout);
97
98 return timeout ? 0 : -ETIMEDOUT;
99 }
100
101 static int imx_phy_reg_addressing(u16 addr, void __iomem *mmio)
102 {
103 u32 crval = addr;
104 int ret;
105
106 /* Supply the address on cr_data_in */
107 writel(crval, mmio + IMX_P0PHYCR);
108
109 /* Assert the cr_cap_addr signal */
110 ret = imx_phy_crbit_assert(mmio, IMX_P0PHYCR_CR_CAP_ADDR, true);
111 if (ret)
112 return ret;
113
114 /* Deassert cr_cap_addr */
115 ret = imx_phy_crbit_assert(mmio, IMX_P0PHYCR_CR_CAP_ADDR, false);
116 if (ret)
117 return ret;
118
119 return 0;
120 }
121
122 static int imx_phy_reg_write(u16 val, void __iomem *mmio)
123 {
124 u32 crval = val;
125 int ret;
126
127 /* Supply the data on cr_data_in */
128 writel(crval, mmio + IMX_P0PHYCR);
129
130 /* Assert the cr_cap_data signal */
131 ret = imx_phy_crbit_assert(mmio, IMX_P0PHYCR_CR_CAP_DATA, true);
132 if (ret)
133 return ret;
134
135 /* Deassert cr_cap_data */
136 ret = imx_phy_crbit_assert(mmio, IMX_P0PHYCR_CR_CAP_DATA, false);
137 if (ret)
138 return ret;
139
140 if (val & IMX_CLOCK_RESET_RESET) {
141 /*
142 * In case we're resetting the phy, it's unable to acknowledge,
143 * so we return immediately here.
144 */
145 crval |= IMX_P0PHYCR_CR_WRITE;
146 writel(crval, mmio + IMX_P0PHYCR);
147 goto out;
148 }
149
150 /* Assert the cr_write signal */
151 ret = imx_phy_crbit_assert(mmio, IMX_P0PHYCR_CR_WRITE, true);
152 if (ret)
153 return ret;
154
155 /* Deassert cr_write */
156 ret = imx_phy_crbit_assert(mmio, IMX_P0PHYCR_CR_WRITE, false);
157 if (ret)
158 return ret;
159
160 out:
161 return 0;
162 }
163
164 static int imx_phy_reg_read(u16 *val, void __iomem *mmio)
165 {
166 int ret;
167
168 /* Assert the cr_read signal */
169 ret = imx_phy_crbit_assert(mmio, IMX_P0PHYCR_CR_READ, true);
170 if (ret)
171 return ret;
172
173 /* Capture the data from cr_data_out[] */
174 *val = readl(mmio + IMX_P0PHYSR) & IMX_P0PHYSR_CR_DATA_OUT;
175
176 /* Deassert cr_read */
177 ret = imx_phy_crbit_assert(mmio, IMX_P0PHYCR_CR_READ, false);
178 if (ret)
179 return ret;
180
181 return 0;
182 }
183
184 static int imx_sata_phy_reset(struct ahci_host_priv *hpriv)
185 {
186 void __iomem *mmio = hpriv->mmio;
187 int timeout = 10;
188 u16 val;
189 int ret;
190
191 /* Reset SATA PHY by setting RESET bit of PHY register CLOCK_RESET */
192 ret = imx_phy_reg_addressing(IMX_CLOCK_RESET, mmio);
193 if (ret)
194 return ret;
195 ret = imx_phy_reg_write(IMX_CLOCK_RESET_RESET, mmio);
196 if (ret)
197 return ret;
198
199 /* Wait for PHY RX_PLL to be stable */
200 do {
201 usleep_range(100, 200);
202 ret = imx_phy_reg_addressing(IMX_LANE0_OUT_STAT, mmio);
203 if (ret)
204 return ret;
205 ret = imx_phy_reg_read(&val, mmio);
206 if (ret)
207 return ret;
208 if (val & IMX_LANE0_OUT_STAT_RX_PLL_STATE)
209 break;
210 } while (--timeout);
211
212 return timeout ? 0 : -ETIMEDOUT;
213 }
214
215 static int imx_sata_enable(struct ahci_host_priv *hpriv)
216 {
217 struct imx_ahci_priv *imxpriv = hpriv->plat_data;
218 struct device *dev = &imxpriv->ahci_pdev->dev;
219 int ret;
220
221 if (imxpriv->no_device)
222 return 0;
223
224 if (hpriv->target_pwr) {
225 ret = regulator_enable(hpriv->target_pwr);
226 if (ret)
227 return ret;
228 }
229
230 ret = clk_prepare_enable(imxpriv->sata_ref_clk);
231 if (ret < 0)
232 goto disable_regulator;
233
234 if (imxpriv->type == AHCI_IMX6Q) {
235 /*
236 * set PHY Paremeters, two steps to configure the GPR13,
237 * one write for rest of parameters, mask of first write
238 * is 0x07ffffff, and the other one write for setting
239 * the mpll_clk_en.
240 */
241 regmap_update_bits(imxpriv->gpr, IOMUXC_GPR13,
242 IMX6Q_GPR13_SATA_RX_EQ_VAL_MASK |
243 IMX6Q_GPR13_SATA_RX_LOS_LVL_MASK |
244 IMX6Q_GPR13_SATA_RX_DPLL_MODE_MASK |
245 IMX6Q_GPR13_SATA_SPD_MODE_MASK |
246 IMX6Q_GPR13_SATA_MPLL_SS_EN |
247 IMX6Q_GPR13_SATA_TX_ATTEN_MASK |
248 IMX6Q_GPR13_SATA_TX_BOOST_MASK |
249 IMX6Q_GPR13_SATA_TX_LVL_MASK |
250 IMX6Q_GPR13_SATA_MPLL_CLK_EN |
251 IMX6Q_GPR13_SATA_TX_EDGE_RATE,
252 imxpriv->phy_params);
253 regmap_update_bits(imxpriv->gpr, IOMUXC_GPR13,
254 IMX6Q_GPR13_SATA_MPLL_CLK_EN,
255 IMX6Q_GPR13_SATA_MPLL_CLK_EN);
256
257 usleep_range(100, 200);
258
259 ret = imx_sata_phy_reset(hpriv);
260 if (ret) {
261 dev_err(dev, "failed to reset phy: %d\n", ret);
262 goto disable_clk;
263 }
264 }
265
266 usleep_range(1000, 2000);
267
268 return 0;
269
270 disable_clk:
271 clk_disable_unprepare(imxpriv->sata_ref_clk);
272 disable_regulator:
273 if (hpriv->target_pwr)
274 regulator_disable(hpriv->target_pwr);
275
276 return ret;
277 }
278
279 static void imx_sata_disable(struct ahci_host_priv *hpriv)
280 {
281 struct imx_ahci_priv *imxpriv = hpriv->plat_data;
282
283 if (imxpriv->no_device)
284 return;
285
286 if (imxpriv->type == AHCI_IMX6Q) {
287 regmap_update_bits(imxpriv->gpr, IOMUXC_GPR13,
288 IMX6Q_GPR13_SATA_MPLL_CLK_EN,
289 !IMX6Q_GPR13_SATA_MPLL_CLK_EN);
290 }
291
292 clk_disable_unprepare(imxpriv->sata_ref_clk);
293
294 if (hpriv->target_pwr)
295 regulator_disable(hpriv->target_pwr);
296 }
297
298 static void ahci_imx_error_handler(struct ata_port *ap)
299 {
300 u32 reg_val;
301 struct ata_device *dev;
302 struct ata_host *host = dev_get_drvdata(ap->dev);
303 struct ahci_host_priv *hpriv = host->private_data;
304 void __iomem *mmio = hpriv->mmio;
305 struct imx_ahci_priv *imxpriv = hpriv->plat_data;
306
307 ahci_error_handler(ap);
308
309 if (!(imxpriv->first_time) || ahci_imx_hotplug)
310 return;
311
312 imxpriv->first_time = false;
313
314 ata_for_each_dev(dev, &ap->link, ENABLED)
315 return;
316 /*
317 * Disable link to save power. An imx ahci port can't be recovered
318 * without full reset once the pddq mode is enabled making it
319 * impossible to use as part of libata LPM.
320 */
321 reg_val = readl(mmio + IMX_P0PHYCR);
322 writel(reg_val | IMX_P0PHYCR_TEST_PDDQ, mmio + IMX_P0PHYCR);
323 imx_sata_disable(hpriv);
324 imxpriv->no_device = true;
325
326 dev_info(ap->dev, "no device found, disabling link.\n");
327 dev_info(ap->dev, "pass " MODULE_PARAM_PREFIX ".hotplug=1 to enable hotplug\n");
328 }
329
330 static int ahci_imx_softreset(struct ata_link *link, unsigned int *class,
331 unsigned long deadline)
332 {
333 struct ata_port *ap = link->ap;
334 struct ata_host *host = dev_get_drvdata(ap->dev);
335 struct ahci_host_priv *hpriv = host->private_data;
336 struct imx_ahci_priv *imxpriv = hpriv->plat_data;
337 int ret = -EIO;
338
339 if (imxpriv->type == AHCI_IMX53)
340 ret = ahci_pmp_retry_srst_ops.softreset(link, class, deadline);
341 else if (imxpriv->type == AHCI_IMX6Q)
342 ret = ahci_ops.softreset(link, class, deadline);
343
344 return ret;
345 }
346
347 static struct ata_port_operations ahci_imx_ops = {
348 .inherits = &ahci_ops,
349 .host_stop = ahci_imx_host_stop,
350 .error_handler = ahci_imx_error_handler,
351 .softreset = ahci_imx_softreset,
352 };
353
354 static const struct ata_port_info ahci_imx_port_info = {
355 .flags = AHCI_FLAG_COMMON,
356 .pio_mask = ATA_PIO4,
357 .udma_mask = ATA_UDMA6,
358 .port_ops = &ahci_imx_ops,
359 };
360
361 static const struct of_device_id imx_ahci_of_match[] = {
362 { .compatible = "fsl,imx53-ahci", .data = (void *)AHCI_IMX53 },
363 { .compatible = "fsl,imx6q-ahci", .data = (void *)AHCI_IMX6Q },
364 {},
365 };
366 MODULE_DEVICE_TABLE(of, imx_ahci_of_match);
367
368 struct reg_value {
369 u32 of_value;
370 u32 reg_value;
371 };
372
373 struct reg_property {
374 const char *name;
375 const struct reg_value *values;
376 size_t num_values;
377 u32 def_value;
378 u32 set_value;
379 };
380
381 static const struct reg_value gpr13_tx_level[] = {
382 { 937, IMX6Q_GPR13_SATA_TX_LVL_0_937_V },
383 { 947, IMX6Q_GPR13_SATA_TX_LVL_0_947_V },
384 { 957, IMX6Q_GPR13_SATA_TX_LVL_0_957_V },
385 { 966, IMX6Q_GPR13_SATA_TX_LVL_0_966_V },
386 { 976, IMX6Q_GPR13_SATA_TX_LVL_0_976_V },
387 { 986, IMX6Q_GPR13_SATA_TX_LVL_0_986_V },
388 { 996, IMX6Q_GPR13_SATA_TX_LVL_0_996_V },
389 { 1005, IMX6Q_GPR13_SATA_TX_LVL_1_005_V },
390 { 1015, IMX6Q_GPR13_SATA_TX_LVL_1_015_V },
391 { 1025, IMX6Q_GPR13_SATA_TX_LVL_1_025_V },
392 { 1035, IMX6Q_GPR13_SATA_TX_LVL_1_035_V },
393 { 1045, IMX6Q_GPR13_SATA_TX_LVL_1_045_V },
394 { 1054, IMX6Q_GPR13_SATA_TX_LVL_1_054_V },
395 { 1064, IMX6Q_GPR13_SATA_TX_LVL_1_064_V },
396 { 1074, IMX6Q_GPR13_SATA_TX_LVL_1_074_V },
397 { 1084, IMX6Q_GPR13_SATA_TX_LVL_1_084_V },
398 { 1094, IMX6Q_GPR13_SATA_TX_LVL_1_094_V },
399 { 1104, IMX6Q_GPR13_SATA_TX_LVL_1_104_V },
400 { 1113, IMX6Q_GPR13_SATA_TX_LVL_1_113_V },
401 { 1123, IMX6Q_GPR13_SATA_TX_LVL_1_123_V },
402 { 1133, IMX6Q_GPR13_SATA_TX_LVL_1_133_V },
403 { 1143, IMX6Q_GPR13_SATA_TX_LVL_1_143_V },
404 { 1152, IMX6Q_GPR13_SATA_TX_LVL_1_152_V },
405 { 1162, IMX6Q_GPR13_SATA_TX_LVL_1_162_V },
406 { 1172, IMX6Q_GPR13_SATA_TX_LVL_1_172_V },
407 { 1182, IMX6Q_GPR13_SATA_TX_LVL_1_182_V },
408 { 1191, IMX6Q_GPR13_SATA_TX_LVL_1_191_V },
409 { 1201, IMX6Q_GPR13_SATA_TX_LVL_1_201_V },
410 { 1211, IMX6Q_GPR13_SATA_TX_LVL_1_211_V },
411 { 1221, IMX6Q_GPR13_SATA_TX_LVL_1_221_V },
412 { 1230, IMX6Q_GPR13_SATA_TX_LVL_1_230_V },
413 { 1240, IMX6Q_GPR13_SATA_TX_LVL_1_240_V }
414 };
415
416 static const struct reg_value gpr13_tx_boost[] = {
417 { 0, IMX6Q_GPR13_SATA_TX_BOOST_0_00_DB },
418 { 370, IMX6Q_GPR13_SATA_TX_BOOST_0_37_DB },
419 { 740, IMX6Q_GPR13_SATA_TX_BOOST_0_74_DB },
420 { 1110, IMX6Q_GPR13_SATA_TX_BOOST_1_11_DB },
421 { 1480, IMX6Q_GPR13_SATA_TX_BOOST_1_48_DB },
422 { 1850, IMX6Q_GPR13_SATA_TX_BOOST_1_85_DB },
423 { 2220, IMX6Q_GPR13_SATA_TX_BOOST_2_22_DB },
424 { 2590, IMX6Q_GPR13_SATA_TX_BOOST_2_59_DB },
425 { 2960, IMX6Q_GPR13_SATA_TX_BOOST_2_96_DB },
426 { 3330, IMX6Q_GPR13_SATA_TX_BOOST_3_33_DB },
427 { 3700, IMX6Q_GPR13_SATA_TX_BOOST_3_70_DB },
428 { 4070, IMX6Q_GPR13_SATA_TX_BOOST_4_07_DB },
429 { 4440, IMX6Q_GPR13_SATA_TX_BOOST_4_44_DB },
430 { 4810, IMX6Q_GPR13_SATA_TX_BOOST_4_81_DB },
431 { 5280, IMX6Q_GPR13_SATA_TX_BOOST_5_28_DB },
432 { 5750, IMX6Q_GPR13_SATA_TX_BOOST_5_75_DB }
433 };
434
435 static const struct reg_value gpr13_tx_atten[] = {
436 { 8, IMX6Q_GPR13_SATA_TX_ATTEN_8_16 },
437 { 9, IMX6Q_GPR13_SATA_TX_ATTEN_9_16 },
438 { 10, IMX6Q_GPR13_SATA_TX_ATTEN_10_16 },
439 { 12, IMX6Q_GPR13_SATA_TX_ATTEN_12_16 },
440 { 14, IMX6Q_GPR13_SATA_TX_ATTEN_14_16 },
441 { 16, IMX6Q_GPR13_SATA_TX_ATTEN_16_16 },
442 };
443
444 static const struct reg_value gpr13_rx_eq[] = {
445 { 500, IMX6Q_GPR13_SATA_RX_EQ_VAL_0_5_DB },
446 { 1000, IMX6Q_GPR13_SATA_RX_EQ_VAL_1_0_DB },
447 { 1500, IMX6Q_GPR13_SATA_RX_EQ_VAL_1_5_DB },
448 { 2000, IMX6Q_GPR13_SATA_RX_EQ_VAL_2_0_DB },
449 { 2500, IMX6Q_GPR13_SATA_RX_EQ_VAL_2_5_DB },
450 { 3000, IMX6Q_GPR13_SATA_RX_EQ_VAL_3_0_DB },
451 { 3500, IMX6Q_GPR13_SATA_RX_EQ_VAL_3_5_DB },
452 { 4000, IMX6Q_GPR13_SATA_RX_EQ_VAL_4_0_DB },
453 };
454
455 static const struct reg_property gpr13_props[] = {
456 {
457 .name = "fsl,transmit-level-mV",
458 .values = gpr13_tx_level,
459 .num_values = ARRAY_SIZE(gpr13_tx_level),
460 .def_value = IMX6Q_GPR13_SATA_TX_LVL_1_025_V,
461 }, {
462 .name = "fsl,transmit-boost-mdB",
463 .values = gpr13_tx_boost,
464 .num_values = ARRAY_SIZE(gpr13_tx_boost),
465 .def_value = IMX6Q_GPR13_SATA_TX_BOOST_3_33_DB,
466 }, {
467 .name = "fsl,transmit-atten-16ths",
468 .values = gpr13_tx_atten,
469 .num_values = ARRAY_SIZE(gpr13_tx_atten),
470 .def_value = IMX6Q_GPR13_SATA_TX_ATTEN_9_16,
471 }, {
472 .name = "fsl,receive-eq-mdB",
473 .values = gpr13_rx_eq,
474 .num_values = ARRAY_SIZE(gpr13_rx_eq),
475 .def_value = IMX6Q_GPR13_SATA_RX_EQ_VAL_3_0_DB,
476 }, {
477 .name = "fsl,no-spread-spectrum",
478 .def_value = IMX6Q_GPR13_SATA_MPLL_SS_EN,
479 .set_value = 0,
480 },
481 };
482
483 static u32 imx_ahci_parse_props(struct device *dev,
484 const struct reg_property *prop, size_t num)
485 {
486 struct device_node *np = dev->of_node;
487 u32 reg_value = 0;
488 int i, j;
489
490 for (i = 0; i < num; i++, prop++) {
491 u32 of_val;
492
493 if (prop->num_values == 0) {
494 if (of_property_read_bool(np, prop->name))
495 reg_value |= prop->set_value;
496 else
497 reg_value |= prop->def_value;
498 continue;
499 }
500
501 if (of_property_read_u32(np, prop->name, &of_val)) {
502 dev_info(dev, "%s not specified, using %08x\n",
503 prop->name, prop->def_value);
504 reg_value |= prop->def_value;
505 continue;
506 }
507
508 for (j = 0; j < prop->num_values; j++) {
509 if (prop->values[j].of_value == of_val) {
510 dev_info(dev, "%s value %u, using %08x\n",
511 prop->name, of_val, prop->values[j].reg_value);
512 reg_value |= prop->values[j].reg_value;
513 break;
514 }
515 }
516
517 if (j == prop->num_values) {
518 dev_err(dev, "DT property %s is not a valid value\n",
519 prop->name);
520 reg_value |= prop->def_value;
521 }
522 }
523
524 return reg_value;
525 }
526
527 static int imx_ahci_probe(struct platform_device *pdev)
528 {
529 struct device *dev = &pdev->dev;
530 const struct of_device_id *of_id;
531 struct ahci_host_priv *hpriv;
532 struct imx_ahci_priv *imxpriv;
533 unsigned int reg_val;
534 int ret;
535
536 of_id = of_match_device(imx_ahci_of_match, dev);
537 if (!of_id)
538 return -EINVAL;
539
540 imxpriv = devm_kzalloc(dev, sizeof(*imxpriv), GFP_KERNEL);
541 if (!imxpriv)
542 return -ENOMEM;
543
544 imxpriv->ahci_pdev = pdev;
545 imxpriv->no_device = false;
546 imxpriv->first_time = true;
547 imxpriv->type = (enum ahci_imx_type)of_id->data;
548
549 imxpriv->sata_clk = devm_clk_get(dev, "sata");
550 if (IS_ERR(imxpriv->sata_clk)) {
551 dev_err(dev, "can't get sata clock.\n");
552 return PTR_ERR(imxpriv->sata_clk);
553 }
554
555 imxpriv->sata_ref_clk = devm_clk_get(dev, "sata_ref");
556 if (IS_ERR(imxpriv->sata_ref_clk)) {
557 dev_err(dev, "can't get sata_ref clock.\n");
558 return PTR_ERR(imxpriv->sata_ref_clk);
559 }
560
561 imxpriv->ahb_clk = devm_clk_get(dev, "ahb");
562 if (IS_ERR(imxpriv->ahb_clk)) {
563 dev_err(dev, "can't get ahb clock.\n");
564 return PTR_ERR(imxpriv->ahb_clk);
565 }
566
567 if (imxpriv->type == AHCI_IMX6Q) {
568 u32 reg_value;
569
570 imxpriv->gpr = syscon_regmap_lookup_by_compatible(
571 "fsl,imx6q-iomuxc-gpr");
572 if (IS_ERR(imxpriv->gpr)) {
573 dev_err(dev,
574 "failed to find fsl,imx6q-iomux-gpr regmap\n");
575 return PTR_ERR(imxpriv->gpr);
576 }
577
578 reg_value = imx_ahci_parse_props(dev, gpr13_props,
579 ARRAY_SIZE(gpr13_props));
580
581 imxpriv->phy_params =
582 IMX6Q_GPR13_SATA_RX_LOS_LVL_SATA2M |
583 IMX6Q_GPR13_SATA_RX_DPLL_MODE_2P_4F |
584 IMX6Q_GPR13_SATA_SPD_MODE_3P0G |
585 reg_value;
586 }
587
588 hpriv = ahci_platform_get_resources(pdev);
589 if (IS_ERR(hpriv))
590 return PTR_ERR(hpriv);
591
592 hpriv->plat_data = imxpriv;
593
594 ret = clk_prepare_enable(imxpriv->sata_clk);
595 if (ret)
596 return ret;
597
598 ret = imx_sata_enable(hpriv);
599 if (ret)
600 goto disable_clk;
601
602 /*
603 * Configure the HWINIT bits of the HOST_CAP and HOST_PORTS_IMPL,
604 * and IP vendor specific register IMX_TIMER1MS.
605 * Configure CAP_SSS (support stagered spin up).
606 * Implement the port0.
607 * Get the ahb clock rate, and configure the TIMER1MS register.
608 */
609 reg_val = readl(hpriv->mmio + HOST_CAP);
610 if (!(reg_val & HOST_CAP_SSS)) {
611 reg_val |= HOST_CAP_SSS;
612 writel(reg_val, hpriv->mmio + HOST_CAP);
613 }
614 reg_val = readl(hpriv->mmio + HOST_PORTS_IMPL);
615 if (!(reg_val & 0x1)) {
616 reg_val |= 0x1;
617 writel(reg_val, hpriv->mmio + HOST_PORTS_IMPL);
618 }
619
620 reg_val = clk_get_rate(imxpriv->ahb_clk) / 1000;
621 writel(reg_val, hpriv->mmio + IMX_TIMER1MS);
622
623 ret = ahci_platform_init_host(pdev, hpriv, &ahci_imx_port_info);
624 if (ret)
625 goto disable_sata;
626
627 return 0;
628
629 disable_sata:
630 imx_sata_disable(hpriv);
631 disable_clk:
632 clk_disable_unprepare(imxpriv->sata_clk);
633 return ret;
634 }
635
636 static void ahci_imx_host_stop(struct ata_host *host)
637 {
638 struct ahci_host_priv *hpriv = host->private_data;
639 struct imx_ahci_priv *imxpriv = hpriv->plat_data;
640
641 imx_sata_disable(hpriv);
642 clk_disable_unprepare(imxpriv->sata_clk);
643 }
644
645 #ifdef CONFIG_PM_SLEEP
646 static int imx_ahci_suspend(struct device *dev)
647 {
648 struct ata_host *host = dev_get_drvdata(dev);
649 struct ahci_host_priv *hpriv = host->private_data;
650 int ret;
651
652 ret = ahci_platform_suspend_host(dev);
653 if (ret)
654 return ret;
655
656 imx_sata_disable(hpriv);
657
658 return 0;
659 }
660
661 static int imx_ahci_resume(struct device *dev)
662 {
663 struct ata_host *host = dev_get_drvdata(dev);
664 struct ahci_host_priv *hpriv = host->private_data;
665 int ret;
666
667 ret = imx_sata_enable(hpriv);
668 if (ret)
669 return ret;
670
671 return ahci_platform_resume_host(dev);
672 }
673 #endif
674
675 static SIMPLE_DEV_PM_OPS(ahci_imx_pm_ops, imx_ahci_suspend, imx_ahci_resume);
676
677 static struct platform_driver imx_ahci_driver = {
678 .probe = imx_ahci_probe,
679 .remove = ata_platform_remove_one,
680 .driver = {
681 .name = "ahci-imx",
682 .owner = THIS_MODULE,
683 .of_match_table = imx_ahci_of_match,
684 .pm = &ahci_imx_pm_ops,
685 },
686 };
687 module_platform_driver(imx_ahci_driver);
688
689 MODULE_DESCRIPTION("Freescale i.MX AHCI SATA platform driver");
690 MODULE_AUTHOR("Richard Zhu <Hong-Xing.Zhu@freescale.com>");
691 MODULE_LICENSE("GPL");
692 MODULE_ALIAS("ahci:imx");
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