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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
be4e456e LW |
2 | /* |
3 | * Cortina Systems Gemini SATA bridge add-on to Faraday FTIDE010 | |
4 | * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org> | |
5 | */ | |
6 | ||
7 | #include <linux/init.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/platform_device.h> | |
10 | #include <linux/bitops.h> | |
11 | #include <linux/mfd/syscon.h> | |
12 | #include <linux/regmap.h> | |
13 | #include <linux/delay.h> | |
14 | #include <linux/reset.h> | |
15 | #include <linux/of_address.h> | |
16 | #include <linux/of_device.h> | |
17 | #include <linux/clk.h> | |
18 | #include <linux/io.h> | |
d872ced2 | 19 | #include <linux/pinctrl/consumer.h> |
be4e456e LW |
20 | #include "sata_gemini.h" |
21 | ||
22 | #define DRV_NAME "gemini_sata_bridge" | |
23 | ||
24 | /** | |
25 | * struct sata_gemini - a state container for a Gemini SATA bridge | |
26 | * @dev: the containing device | |
27 | * @base: remapped I/O memory base | |
28 | * @muxmode: the current muxing mode | |
29 | * @ide_pins: if the device is using the plain IDE interface pins | |
30 | * @sata_bridge: if the device enables the SATA bridge | |
31 | * @sata0_reset: SATA0 reset handler | |
32 | * @sata1_reset: SATA1 reset handler | |
33 | * @sata0_pclk: SATA0 PCLK handler | |
34 | * @sata1_pclk: SATA1 PCLK handler | |
35 | */ | |
36 | struct sata_gemini { | |
37 | struct device *dev; | |
38 | void __iomem *base; | |
39 | enum gemini_muxmode muxmode; | |
40 | bool ide_pins; | |
41 | bool sata_bridge; | |
42 | struct reset_control *sata0_reset; | |
43 | struct reset_control *sata1_reset; | |
44 | struct clk *sata0_pclk; | |
45 | struct clk *sata1_pclk; | |
46 | }; | |
47 | ||
be4e456e LW |
48 | /* Miscellaneous Control Register */ |
49 | #define GEMINI_GLOBAL_MISC_CTRL 0x30 | |
50 | /* | |
51 | * Values of IDE IOMUX bits in the misc control register | |
52 | * | |
53 | * Bits 26:24 are "IDE IO Select", which decides what SATA | |
54 | * adapters are connected to which of the two IDE/ATA | |
55 | * controllers in the Gemini. We can connect the two IDE blocks | |
56 | * to one SATA adapter each, both acting as master, or one IDE | |
57 | * blocks to two SATA adapters so the IDE block can act in a | |
58 | * master/slave configuration. | |
59 | * | |
60 | * We also bring out different blocks on the actual IDE | |
61 | * pins (not SATA pins) if (and only if) these are muxed in. | |
62 | * | |
63 | * 111-100 - Reserved | |
64 | * Mode 0: 000 - ata0 master <-> sata0 | |
65 | * ata1 master <-> sata1 | |
66 | * ata0 slave interface brought out on IDE pads | |
67 | * Mode 1: 001 - ata0 master <-> sata0 | |
68 | * ata1 master <-> sata1 | |
69 | * ata1 slave interface brought out on IDE pads | |
70 | * Mode 2: 010 - ata1 master <-> sata1 | |
71 | * ata1 slave <-> sata0 | |
72 | * ata0 master and slave interfaces brought out | |
73 | * on IDE pads | |
74 | * Mode 3: 011 - ata0 master <-> sata0 | |
75 | * ata1 slave <-> sata1 | |
76 | * ata1 master and slave interfaces brought out | |
77 | * on IDE pads | |
78 | */ | |
79 | #define GEMINI_IDE_IOMUX_MASK (7 << 24) | |
80 | #define GEMINI_IDE_IOMUX_MODE0 (0 << 24) | |
81 | #define GEMINI_IDE_IOMUX_MODE1 (1 << 24) | |
82 | #define GEMINI_IDE_IOMUX_MODE2 (2 << 24) | |
83 | #define GEMINI_IDE_IOMUX_MODE3 (3 << 24) | |
84 | #define GEMINI_IDE_IOMUX_SHIFT (24) | |
be4e456e LW |
85 | |
86 | /* | |
87 | * Registers directly controlling the PATA<->SATA adapters | |
88 | */ | |
89 | #define GEMINI_SATA_ID 0x00 | |
90 | #define GEMINI_SATA_PHY_ID 0x04 | |
91 | #define GEMINI_SATA0_STATUS 0x08 | |
92 | #define GEMINI_SATA1_STATUS 0x0c | |
93 | #define GEMINI_SATA0_CTRL 0x18 | |
94 | #define GEMINI_SATA1_CTRL 0x1c | |
95 | ||
96 | #define GEMINI_SATA_STATUS_BIST_DONE BIT(5) | |
97 | #define GEMINI_SATA_STATUS_BIST_OK BIT(4) | |
98 | #define GEMINI_SATA_STATUS_PHY_READY BIT(0) | |
99 | ||
100 | #define GEMINI_SATA_CTRL_PHY_BIST_EN BIT(14) | |
101 | #define GEMINI_SATA_CTRL_PHY_FORCE_IDLE BIT(13) | |
102 | #define GEMINI_SATA_CTRL_PHY_FORCE_READY BIT(12) | |
103 | #define GEMINI_SATA_CTRL_PHY_AFE_LOOP_EN BIT(10) | |
104 | #define GEMINI_SATA_CTRL_PHY_DIG_LOOP_EN BIT(9) | |
105 | #define GEMINI_SATA_CTRL_HOTPLUG_DETECT_EN BIT(4) | |
106 | #define GEMINI_SATA_CTRL_ATAPI_EN BIT(3) | |
107 | #define GEMINI_SATA_CTRL_BUS_WITH_20 BIT(2) | |
108 | #define GEMINI_SATA_CTRL_SLAVE_EN BIT(1) | |
109 | #define GEMINI_SATA_CTRL_EN BIT(0) | |
110 | ||
111 | /* | |
112 | * There is only ever one instance of this bridge on a system, | |
113 | * so create a singleton so that the FTIDE010 instances can grab | |
114 | * a reference to it. | |
115 | */ | |
116 | static struct sata_gemini *sg_singleton; | |
117 | ||
118 | struct sata_gemini *gemini_sata_bridge_get(void) | |
119 | { | |
120 | if (sg_singleton) | |
121 | return sg_singleton; | |
122 | return ERR_PTR(-EPROBE_DEFER); | |
123 | } | |
124 | EXPORT_SYMBOL(gemini_sata_bridge_get); | |
125 | ||
126 | bool gemini_sata_bridge_enabled(struct sata_gemini *sg, bool is_ata1) | |
127 | { | |
128 | if (!sg->sata_bridge) | |
129 | return false; | |
130 | /* | |
131 | * In muxmode 2 and 3 one of the ATA controllers is | |
132 | * actually not connected to any SATA bridge. | |
133 | */ | |
134 | if ((sg->muxmode == GEMINI_MUXMODE_2) && | |
135 | !is_ata1) | |
136 | return false; | |
137 | if ((sg->muxmode == GEMINI_MUXMODE_3) && | |
138 | is_ata1) | |
139 | return false; | |
140 | ||
141 | return true; | |
142 | } | |
143 | EXPORT_SYMBOL(gemini_sata_bridge_enabled); | |
144 | ||
145 | enum gemini_muxmode gemini_sata_get_muxmode(struct sata_gemini *sg) | |
146 | { | |
147 | return sg->muxmode; | |
148 | } | |
149 | EXPORT_SYMBOL(gemini_sata_get_muxmode); | |
150 | ||
151 | static int gemini_sata_setup_bridge(struct sata_gemini *sg, | |
152 | unsigned int bridge) | |
153 | { | |
154 | unsigned long timeout = jiffies + (HZ * 1); | |
155 | bool bridge_online; | |
156 | u32 val; | |
157 | ||
158 | if (bridge == 0) { | |
159 | val = GEMINI_SATA_CTRL_HOTPLUG_DETECT_EN | GEMINI_SATA_CTRL_EN; | |
160 | /* SATA0 slave mode is only used in muxmode 2 */ | |
161 | if (sg->muxmode == GEMINI_MUXMODE_2) | |
162 | val |= GEMINI_SATA_CTRL_SLAVE_EN; | |
163 | writel(val, sg->base + GEMINI_SATA0_CTRL); | |
164 | } else { | |
165 | val = GEMINI_SATA_CTRL_HOTPLUG_DETECT_EN | GEMINI_SATA_CTRL_EN; | |
166 | /* SATA1 slave mode is only used in muxmode 3 */ | |
167 | if (sg->muxmode == GEMINI_MUXMODE_3) | |
168 | val |= GEMINI_SATA_CTRL_SLAVE_EN; | |
169 | writel(val, sg->base + GEMINI_SATA1_CTRL); | |
170 | } | |
171 | ||
172 | /* Vendor code waits 10 ms here */ | |
173 | msleep(10); | |
174 | ||
175 | /* Wait for PHY to become ready */ | |
176 | do { | |
177 | msleep(100); | |
178 | ||
179 | if (bridge == 0) | |
180 | val = readl(sg->base + GEMINI_SATA0_STATUS); | |
181 | else | |
182 | val = readl(sg->base + GEMINI_SATA1_STATUS); | |
183 | if (val & GEMINI_SATA_STATUS_PHY_READY) | |
184 | break; | |
185 | } while (time_before(jiffies, timeout)); | |
186 | ||
187 | bridge_online = !!(val & GEMINI_SATA_STATUS_PHY_READY); | |
188 | ||
189 | dev_info(sg->dev, "SATA%d PHY %s\n", bridge, | |
190 | bridge_online ? "ready" : "not ready"); | |
191 | ||
192 | return bridge_online ? 0: -ENODEV; | |
193 | } | |
194 | ||
195 | int gemini_sata_start_bridge(struct sata_gemini *sg, unsigned int bridge) | |
196 | { | |
197 | struct clk *pclk; | |
198 | int ret; | |
199 | ||
200 | if (bridge == 0) | |
201 | pclk = sg->sata0_pclk; | |
202 | else | |
203 | pclk = sg->sata1_pclk; | |
204 | clk_enable(pclk); | |
205 | msleep(10); | |
206 | ||
207 | /* Do not keep clocking a bridge that is not online */ | |
208 | ret = gemini_sata_setup_bridge(sg, bridge); | |
209 | if (ret) | |
210 | clk_disable(pclk); | |
211 | ||
212 | return ret; | |
213 | } | |
214 | EXPORT_SYMBOL(gemini_sata_start_bridge); | |
215 | ||
216 | void gemini_sata_stop_bridge(struct sata_gemini *sg, unsigned int bridge) | |
217 | { | |
218 | if (bridge == 0) | |
219 | clk_disable(sg->sata0_pclk); | |
220 | else if (bridge == 1) | |
221 | clk_disable(sg->sata1_pclk); | |
222 | } | |
223 | EXPORT_SYMBOL(gemini_sata_stop_bridge); | |
224 | ||
225 | int gemini_sata_reset_bridge(struct sata_gemini *sg, | |
226 | unsigned int bridge) | |
227 | { | |
228 | if (bridge == 0) | |
229 | reset_control_reset(sg->sata0_reset); | |
230 | else | |
231 | reset_control_reset(sg->sata1_reset); | |
232 | msleep(10); | |
233 | return gemini_sata_setup_bridge(sg, bridge); | |
234 | } | |
235 | EXPORT_SYMBOL(gemini_sata_reset_bridge); | |
236 | ||
237 | static int gemini_sata_bridge_init(struct sata_gemini *sg) | |
238 | { | |
239 | struct device *dev = sg->dev; | |
240 | u32 sata_id, sata_phy_id; | |
241 | int ret; | |
242 | ||
243 | sg->sata0_pclk = devm_clk_get(dev, "SATA0_PCLK"); | |
244 | if (IS_ERR(sg->sata0_pclk)) { | |
245 | dev_err(dev, "no SATA0 PCLK"); | |
246 | return -ENODEV; | |
247 | } | |
248 | sg->sata1_pclk = devm_clk_get(dev, "SATA1_PCLK"); | |
249 | if (IS_ERR(sg->sata1_pclk)) { | |
250 | dev_err(dev, "no SATA1 PCLK"); | |
251 | return -ENODEV; | |
252 | } | |
253 | ||
254 | ret = clk_prepare_enable(sg->sata0_pclk); | |
255 | if (ret) { | |
256 | pr_err("failed to enable SATA0 PCLK\n"); | |
257 | return ret; | |
258 | } | |
259 | ret = clk_prepare_enable(sg->sata1_pclk); | |
260 | if (ret) { | |
261 | pr_err("failed to enable SATA1 PCLK\n"); | |
262 | clk_disable_unprepare(sg->sata0_pclk); | |
263 | return ret; | |
264 | } | |
265 | ||
afbd39a4 | 266 | sg->sata0_reset = devm_reset_control_get_exclusive(dev, "sata0"); |
be4e456e LW |
267 | if (IS_ERR(sg->sata0_reset)) { |
268 | dev_err(dev, "no SATA0 reset controller\n"); | |
269 | clk_disable_unprepare(sg->sata1_pclk); | |
270 | clk_disable_unprepare(sg->sata0_pclk); | |
271 | return PTR_ERR(sg->sata0_reset); | |
272 | } | |
afbd39a4 | 273 | sg->sata1_reset = devm_reset_control_get_exclusive(dev, "sata1"); |
be4e456e LW |
274 | if (IS_ERR(sg->sata1_reset)) { |
275 | dev_err(dev, "no SATA1 reset controller\n"); | |
276 | clk_disable_unprepare(sg->sata1_pclk); | |
277 | clk_disable_unprepare(sg->sata0_pclk); | |
278 | return PTR_ERR(sg->sata1_reset); | |
279 | } | |
280 | ||
281 | sata_id = readl(sg->base + GEMINI_SATA_ID); | |
282 | sata_phy_id = readl(sg->base + GEMINI_SATA_PHY_ID); | |
283 | sg->sata_bridge = true; | |
284 | clk_disable(sg->sata0_pclk); | |
285 | clk_disable(sg->sata1_pclk); | |
286 | ||
287 | dev_info(dev, "SATA ID %08x, PHY ID: %08x\n", sata_id, sata_phy_id); | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
d872ced2 LW |
292 | static int gemini_setup_ide_pins(struct device *dev) |
293 | { | |
294 | struct pinctrl *p; | |
295 | struct pinctrl_state *ide_state; | |
296 | int ret; | |
297 | ||
298 | p = devm_pinctrl_get(dev); | |
299 | if (IS_ERR(p)) | |
300 | return PTR_ERR(p); | |
301 | ||
302 | ide_state = pinctrl_lookup_state(p, "ide"); | |
303 | if (IS_ERR(ide_state)) | |
304 | return PTR_ERR(ide_state); | |
305 | ||
306 | ret = pinctrl_select_state(p, ide_state); | |
307 | if (ret) { | |
308 | dev_err(dev, "could not select IDE state\n"); | |
309 | return ret; | |
310 | } | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
be4e456e LW |
315 | static int gemini_sata_probe(struct platform_device *pdev) |
316 | { | |
317 | struct device *dev = &pdev->dev; | |
318 | struct device_node *np = dev->of_node; | |
319 | struct sata_gemini *sg; | |
cea9c8d3 | 320 | struct regmap *map; |
be4e456e LW |
321 | struct resource *res; |
322 | enum gemini_muxmode muxmode; | |
323 | u32 gmode; | |
324 | u32 gmask; | |
be4e456e LW |
325 | int ret; |
326 | ||
327 | sg = devm_kzalloc(dev, sizeof(*sg), GFP_KERNEL); | |
328 | if (!sg) | |
329 | return -ENOMEM; | |
330 | sg->dev = dev; | |
331 | ||
332 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
333 | if (!res) | |
334 | return -ENODEV; | |
335 | ||
336 | sg->base = devm_ioremap_resource(dev, res); | |
337 | if (IS_ERR(sg->base)) | |
338 | return PTR_ERR(sg->base); | |
339 | ||
340 | map = syscon_regmap_lookup_by_phandle(np, "syscon"); | |
341 | if (IS_ERR(map)) { | |
342 | dev_err(dev, "no global syscon\n"); | |
343 | return PTR_ERR(map); | |
344 | } | |
345 | ||
346 | /* Set up the SATA bridge if need be */ | |
347 | if (of_property_read_bool(np, "cortina,gemini-enable-sata-bridge")) { | |
348 | ret = gemini_sata_bridge_init(sg); | |
349 | if (ret) | |
350 | return ret; | |
351 | } | |
352 | ||
353 | if (of_property_read_bool(np, "cortina,gemini-enable-ide-pins")) | |
354 | sg->ide_pins = true; | |
355 | ||
356 | if (!sg->sata_bridge && !sg->ide_pins) { | |
357 | dev_err(dev, "neither SATA bridge or IDE output enabled\n"); | |
358 | ret = -EINVAL; | |
359 | goto out_unprep_clk; | |
360 | } | |
361 | ||
362 | ret = of_property_read_u32(np, "cortina,gemini-ata-muxmode", &muxmode); | |
363 | if (ret) { | |
364 | dev_err(dev, "could not parse ATA muxmode\n"); | |
365 | goto out_unprep_clk; | |
366 | } | |
367 | if (muxmode > GEMINI_MUXMODE_3) { | |
368 | dev_err(dev, "illegal muxmode %d\n", muxmode); | |
369 | ret = -EINVAL; | |
370 | goto out_unprep_clk; | |
371 | } | |
372 | sg->muxmode = muxmode; | |
373 | gmask = GEMINI_IDE_IOMUX_MASK; | |
374 | gmode = (muxmode << GEMINI_IDE_IOMUX_SHIFT); | |
375 | ||
be4e456e LW |
376 | ret = regmap_update_bits(map, GEMINI_GLOBAL_MISC_CTRL, gmask, gmode); |
377 | if (ret) { | |
378 | dev_err(dev, "unable to set up IDE muxing\n"); | |
379 | ret = -ENODEV; | |
380 | goto out_unprep_clk; | |
381 | } | |
382 | ||
d872ced2 LW |
383 | /* |
384 | * Route out the IDE pins if desired. | |
385 | * This is done by looking up a special pin control state called | |
386 | * "ide" that will route out the IDE pins. | |
387 | */ | |
388 | if (sg->ide_pins) { | |
389 | ret = gemini_setup_ide_pins(dev); | |
390 | if (ret) | |
391 | return ret; | |
392 | } | |
393 | ||
be4e456e LW |
394 | dev_info(dev, "set up the Gemini IDE/SATA nexus\n"); |
395 | platform_set_drvdata(pdev, sg); | |
396 | sg_singleton = sg; | |
397 | ||
398 | return 0; | |
399 | ||
400 | out_unprep_clk: | |
401 | if (sg->sata_bridge) { | |
402 | clk_unprepare(sg->sata1_pclk); | |
403 | clk_unprepare(sg->sata0_pclk); | |
404 | } | |
405 | return ret; | |
406 | } | |
407 | ||
408 | static int gemini_sata_remove(struct platform_device *pdev) | |
409 | { | |
410 | struct sata_gemini *sg = platform_get_drvdata(pdev); | |
411 | ||
412 | if (sg->sata_bridge) { | |
413 | clk_unprepare(sg->sata1_pclk); | |
414 | clk_unprepare(sg->sata0_pclk); | |
415 | } | |
416 | sg_singleton = NULL; | |
417 | ||
418 | return 0; | |
419 | } | |
420 | ||
421 | static const struct of_device_id gemini_sata_of_match[] = { | |
422 | { | |
423 | .compatible = "cortina,gemini-sata-bridge", | |
424 | }, | |
425 | {}, | |
426 | }; | |
427 | ||
428 | static struct platform_driver gemini_sata_driver = { | |
429 | .driver = { | |
430 | .name = DRV_NAME, | |
431 | .of_match_table = of_match_ptr(gemini_sata_of_match), | |
432 | }, | |
433 | .probe = gemini_sata_probe, | |
434 | .remove = gemini_sata_remove, | |
435 | }; | |
436 | module_platform_driver(gemini_sata_driver); | |
437 | ||
438 | MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>"); | |
439 | MODULE_LICENSE("GPL"); | |
440 | MODULE_ALIAS("platform:" DRV_NAME); |