xref: /freebsd/sys/arm/nvidia/tegra_sdhci.c (revision 734e82fe33aa764367791a7d603b383996c6b40b) 
1 /*-
2  * Copyright (c) 2016 Michal Meloun <mmel@FreeBSD.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 /*
29  * SDHCI driver glue for NVIDIA Tegra family
30  *
31  */
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/types.h>
35 #include <sys/bus.h>
36 #include <sys/gpio.h>
37 #include <sys/kernel.h>
38 #include <sys/lock.h>
39 #include <sys/malloc.h>
40 #include <sys/module.h>
41 #include <sys/mutex.h>
42 #include <sys/resource.h>
43 #include <sys/rman.h>
44 #include <sys/sysctl.h>
45 #include <sys/taskqueue.h>
46 
47 #include <machine/bus.h>
48 #include <machine/resource.h>
49 #include <machine/intr.h>
50 
51 #include <dev/extres/clk/clk.h>
52 #include <dev/extres/hwreset/hwreset.h>
53 #include <dev/gpio/gpiobusvar.h>
54 #include <dev/mmc/bridge.h>
55 #include <dev/mmc/mmcbrvar.h>
56 #include <dev/ofw/ofw_bus.h>
57 #include <dev/ofw/ofw_bus_subr.h>
58 #include <dev/sdhci/sdhci.h>
59 #include <dev/sdhci/sdhci_fdt_gpio.h>
60 
61 #include "sdhci_if.h"
62 
63 #include "opt_mmccam.h"
64 
65 /* Tegra SDHOST controller vendor register definitions */
66 #define	SDMMC_VENDOR_CLOCK_CNTRL		0x100
67 #define	 VENDOR_CLOCK_CNTRL_CLK_SHIFT			8
68 #define	 VENDOR_CLOCK_CNTRL_CLK_MASK			0xFF
69 #define	SDMMC_VENDOR_SYS_SW_CNTRL		0x104
70 #define	SDMMC_VENDOR_CAP_OVERRIDES		0x10C
71 #define	SDMMC_VENDOR_BOOT_CNTRL			0x110
72 #define	SDMMC_VENDOR_BOOT_ACK_TIMEOUT		0x114
73 #define	SDMMC_VENDOR_BOOT_DAT_TIMEOUT		0x118
74 #define	SDMMC_VENDOR_DEBOUNCE_COUNT		0x11C
75 #define	SDMMC_VENDOR_MISC_CNTRL			0x120
76 #define	 VENDOR_MISC_CTRL_ENABLE_SDR104			0x8
77 #define	 VENDOR_MISC_CTRL_ENABLE_SDR50			0x10
78 #define	 VENDOR_MISC_CTRL_ENABLE_SDHCI_SPEC_300		0x20
79 #define	 VENDOR_MISC_CTRL_ENABLE_DDR50			0x200
80 #define	SDMMC_MAX_CURRENT_OVERRIDE		0x124
81 #define	SDMMC_MAX_CURRENT_OVERRIDE_HI		0x128
82 #define	SDMMC_VENDOR_CLK_GATE_HYSTERESIS_COUNT 	0x1D0
83 #define	SDMMC_VENDOR_PHWRESET_VAL0		0x1D4
84 #define	SDMMC_VENDOR_PHWRESET_VAL1		0x1D8
85 #define	SDMMC_VENDOR_PHWRESET_VAL2		0x1DC
86 #define	SDMMC_SDMEMCOMPPADCTRL_0		0x1E0
87 #define	SDMMC_AUTO_CAL_CONFIG			0x1E4
88 #define	SDMMC_AUTO_CAL_INTERVAL			0x1E8
89 #define	SDMMC_AUTO_CAL_STATUS			0x1EC
90 #define	SDMMC_SDMMC_MCCIF_FIFOCTRL		0x1F4
91 #define	SDMMC_TIMEOUT_WCOAL_SDMMC		0x1F8
92 
93 /* Compatible devices. */
94 static struct ofw_compat_data compat_data[] = {
95 	{"nvidia,tegra124-sdhci",	1},
96 	{"nvidia,tegra210-sdhci",	1},
97 	{NULL,				0},
98 };
99 
100 struct tegra_sdhci_softc {
101 	device_t		dev;
102 	struct resource *	mem_res;
103 	struct resource *	irq_res;
104 	void *			intr_cookie;
105 	u_int			quirks;	/* Chip specific quirks */
106 	u_int			caps;	/* If we override SDHCI_CAPABILITIES */
107 	uint32_t		max_clk; /* Max possible freq */
108 	clk_t			clk;
109 	hwreset_t 		reset;
110 	gpio_pin_t		gpio_power;
111 	struct sdhci_fdt_gpio	*gpio;
112 
113 	int			force_card_present;
114 	struct sdhci_slot	slot;
115 
116 };
117 
118 static inline uint32_t
119 RD4(struct tegra_sdhci_softc *sc, bus_size_t off)
120 {
121 
122 	return (bus_read_4(sc->mem_res, off));
123 }
124 
125 static uint8_t
126 tegra_sdhci_read_1(device_t dev, struct sdhci_slot *slot, bus_size_t off)
127 {
128 	struct tegra_sdhci_softc *sc;
129 
130 	sc = device_get_softc(dev);
131 	return (bus_read_1(sc->mem_res, off));
132 }
133 
134 static uint16_t
135 tegra_sdhci_read_2(device_t dev, struct sdhci_slot *slot, bus_size_t off)
136 {
137 	struct tegra_sdhci_softc *sc;
138 
139 	sc = device_get_softc(dev);
140 	return (bus_read_2(sc->mem_res, off));
141 }
142 
143 static uint32_t
144 tegra_sdhci_read_4(device_t dev, struct sdhci_slot *slot, bus_size_t off)
145 {
146 	struct tegra_sdhci_softc *sc;
147 	uint32_t val32;
148 
149 	sc = device_get_softc(dev);
150 	val32 = bus_read_4(sc->mem_res, off);
151 	/* Force the card-present state if necessary. */
152 	if (off == SDHCI_PRESENT_STATE && sc->force_card_present)
153 		val32 |= SDHCI_CARD_PRESENT;
154 	return (val32);
155 }
156 
157 static void
158 tegra_sdhci_read_multi_4(device_t dev, struct sdhci_slot *slot, bus_size_t off,
159     uint32_t *data, bus_size_t count)
160 {
161 	struct tegra_sdhci_softc *sc;
162 
163 	sc = device_get_softc(dev);
164 	bus_read_multi_4(sc->mem_res, off, data, count);
165 }
166 
167 static void
168 tegra_sdhci_write_1(device_t dev, struct sdhci_slot *slot, bus_size_t off,
169     uint8_t val)
170 {
171 	struct tegra_sdhci_softc *sc;
172 
173 	sc = device_get_softc(dev);
174 	bus_write_1(sc->mem_res, off, val);
175 }
176 
177 static void
178 tegra_sdhci_write_2(device_t dev, struct sdhci_slot *slot, bus_size_t off,
179     uint16_t val)
180 {
181 	struct tegra_sdhci_softc *sc;
182 
183 	sc = device_get_softc(dev);
184 	bus_write_2(sc->mem_res, off, val);
185 }
186 
187 static void
188 tegra_sdhci_write_4(device_t dev, struct sdhci_slot *slot, bus_size_t off,
189     uint32_t val)
190 {
191 	struct tegra_sdhci_softc *sc;
192 
193 	sc = device_get_softc(dev);
194 	bus_write_4(sc->mem_res, off, val);
195 }
196 
197 static void
198 tegra_sdhci_write_multi_4(device_t dev, struct sdhci_slot *slot, bus_size_t off,
199     uint32_t *data, bus_size_t count)
200 {
201 	struct tegra_sdhci_softc *sc;
202 
203 	sc = device_get_softc(dev);
204 	bus_write_multi_4(sc->mem_res, off, data, count);
205 }
206 
207 static void
208 tegra_sdhci_intr(void *arg)
209 {
210 	struct tegra_sdhci_softc *sc = arg;
211 
212 	sdhci_generic_intr(&sc->slot);
213 	RD4(sc, SDHCI_INT_STATUS);
214 }
215 
216 static int
217 tegra_sdhci_get_ro(device_t brdev, device_t reqdev)
218 {
219 	struct tegra_sdhci_softc *sc = device_get_softc(brdev);
220 
221 	return (sdhci_fdt_gpio_get_readonly(sc->gpio));
222 }
223 
224 static bool
225 tegra_sdhci_get_card_present(device_t dev, struct sdhci_slot *slot)
226 {
227 	struct tegra_sdhci_softc *sc = device_get_softc(dev);
228 
229 	return (sdhci_fdt_gpio_get_present(sc->gpio));
230 }
231 
232 static int
233 tegra_sdhci_probe(device_t dev)
234 {
235 	struct tegra_sdhci_softc *sc;
236 	phandle_t node;
237 	pcell_t cid;
238 	const struct ofw_compat_data *cd;
239 
240 	sc = device_get_softc(dev);
241 	if (!ofw_bus_status_okay(dev))
242 		return (ENXIO);
243 
244 	cd = ofw_bus_search_compatible(dev, compat_data);
245 	if (cd->ocd_data == 0)
246 		return (ENXIO);
247 
248 	node = ofw_bus_get_node(dev);
249 	device_set_desc(dev, "Tegra SDHCI controller");
250 
251 	/* Allow dts to patch quirks, slots, and max-frequency. */
252 	if ((OF_getencprop(node, "quirks", &cid, sizeof(cid))) > 0)
253 		sc->quirks = cid;
254 	if ((OF_getencprop(node, "max-frequency", &cid, sizeof(cid))) > 0)
255 		sc->max_clk = cid;
256 
257 	return (BUS_PROBE_DEFAULT);
258 }
259 
260 static int
261 tegra_sdhci_attach(device_t dev)
262 {
263 	struct tegra_sdhci_softc *sc;
264 	int rid, rv;
265 	uint64_t freq;
266 	phandle_t node, prop;
267 
268 	sc = device_get_softc(dev);
269 	sc->dev = dev;
270 	node = ofw_bus_get_node(dev);
271 
272 	rid = 0;
273 	sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
274 	    RF_ACTIVE);
275 	if (!sc->mem_res) {
276 		device_printf(dev, "cannot allocate memory window\n");
277 		rv = ENXIO;
278 		goto fail;
279 	}
280 
281 	rid = 0;
282 	sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
283 	    RF_ACTIVE);
284 	if (!sc->irq_res) {
285 		device_printf(dev, "cannot allocate interrupt\n");
286 		rv = ENXIO;
287 		goto fail;
288 	}
289 
290 	rv = hwreset_get_by_ofw_name(sc->dev, 0, "sdhci", &sc->reset);
291 	if (rv != 0) {
292 		device_printf(sc->dev, "Cannot get 'sdhci' reset\n");
293 		goto fail;
294 	}
295 	rv = hwreset_assert(sc->reset);
296 	if (rv != 0) {
297 		device_printf(dev, "Cannot reset 'sdhci' reset\n");
298 		goto fail;
299 	}
300 
301 	gpio_pin_get_by_ofw_property(sc->dev, node, "power-gpios",
302 	    &sc->gpio_power);
303 
304 	if (OF_hasprop(node, "assigned-clocks")) {
305 		rv = clk_set_assigned(sc->dev, node);
306 		if (rv != 0) {
307 			device_printf(dev, "Cannot set assigned clocks\n");
308 			goto fail;
309 		}
310 	}
311 
312 	rv = clk_get_by_ofw_index(dev, 0, 0, &sc->clk);
313 	if (rv != 0) {
314 		device_printf(dev, "Cannot get clock\n");
315 		goto fail;
316 	}
317 	rv = clk_enable(sc->clk);
318 	if (rv != 0) {
319 		device_printf(dev, "Cannot enable clock\n");
320 		goto fail;
321 	}
322 	rv = clk_set_freq(sc->clk, 48000000, CLK_SET_ROUND_DOWN);
323 	if (rv != 0) {
324 		device_printf(dev, "Cannot set clock\n");
325 	}
326 	rv = clk_get_freq(sc->clk, &freq);
327 	if (rv != 0) {
328 		device_printf(dev, "Cannot get clock frequency\n");
329 		goto fail;
330 	}
331 	DELAY(4000);
332 	rv = hwreset_deassert(sc->reset);
333 	if (rv != 0) {
334 		device_printf(dev, "Cannot unreset 'sdhci' reset\n");
335 		goto fail;
336 	}
337 	if (bootverbose)
338 		device_printf(dev, " Base MMC clock: %jd\n", (uintmax_t)freq);
339 
340 	/* Fill slot information. */
341 	sc->max_clk = (int)freq;
342 	sc->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
343 	    SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
344 	    SDHCI_QUIRK_MISSING_CAPS;
345 
346 	/* Limit real slot capabilities. */
347 	sc->caps = RD4(sc, SDHCI_CAPABILITIES);
348 	if (OF_getencprop(node, "bus-width", &prop, sizeof(prop)) > 0) {
349 		sc->caps &= ~(MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA);
350 		switch (prop) {
351 		case 8:
352 			sc->caps |= MMC_CAP_8_BIT_DATA;
353 			/* FALLTHROUGH */
354 		case 4:
355 			sc->caps |= MMC_CAP_4_BIT_DATA;
356 			break;
357 		case 1:
358 			break;
359 		default:
360 			device_printf(dev, "Bad bus-width value %u\n", prop);
361 			break;
362 		}
363 	}
364 	if (OF_hasprop(node, "non-removable"))
365 		sc->force_card_present = 1;
366 	/*
367 	 * Clear clock field, so SDHCI driver uses supplied frequency.
368 	 * in sc->slot.max_clk
369 	 */
370 	sc->caps &= ~SDHCI_CLOCK_V3_BASE_MASK;
371 
372 	sc->slot.quirks = sc->quirks;
373 	sc->slot.max_clk = sc->max_clk;
374 	sc->slot.caps = sc->caps;
375 
376 	if (bus_setup_intr(dev, sc->irq_res, INTR_TYPE_BIO | INTR_MPSAFE,
377 	    NULL, tegra_sdhci_intr, sc, &sc->intr_cookie)) {
378 		device_printf(dev, "cannot setup interrupt handler\n");
379 		rv = ENXIO;
380 		goto fail;
381 	}
382 	rv = sdhci_init_slot(dev, &sc->slot, 0);
383 	if (rv != 0) {
384 		goto fail;
385 	}
386 
387 	sc->gpio = sdhci_fdt_gpio_setup(sc->dev, &sc->slot);
388 
389 	bus_generic_probe(dev);
390 	bus_generic_attach(dev);
391 
392 	sdhci_start_slot(&sc->slot);
393 
394 	return (0);
395 
396 fail:
397 	if (sc->gpio != NULL)
398 		sdhci_fdt_gpio_teardown(sc->gpio);
399 	if (sc->intr_cookie != NULL)
400 		bus_teardown_intr(dev, sc->irq_res, sc->intr_cookie);
401 	if (sc->gpio_power != NULL)
402 		gpio_pin_release(sc->gpio_power);
403 	if (sc->clk != NULL)
404 		clk_release(sc->clk);
405 	if (sc->reset != NULL)
406 		hwreset_release(sc->reset);
407 	if (sc->irq_res != NULL)
408 		bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
409 	if (sc->mem_res != NULL)
410 		bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res);
411 
412 	return (rv);
413 }
414 
415 static int
416 tegra_sdhci_detach(device_t dev)
417 {
418 	struct tegra_sdhci_softc *sc = device_get_softc(dev);
419 	struct sdhci_slot *slot = &sc->slot;
420 
421 	bus_generic_detach(dev);
422 	sdhci_fdt_gpio_teardown(sc->gpio);
423 	clk_release(sc->clk);
424 	bus_teardown_intr(dev, sc->irq_res, sc->intr_cookie);
425 	bus_release_resource(dev, SYS_RES_IRQ, rman_get_rid(sc->irq_res),
426 			     sc->irq_res);
427 
428 	sdhci_cleanup_slot(slot);
429 	bus_release_resource(dev, SYS_RES_MEMORY,
430 			     rman_get_rid(sc->mem_res),
431 			     sc->mem_res);
432 	return (0);
433 }
434 
435 static device_method_t tegra_sdhci_methods[] = {
436 	/* Device interface */
437 	DEVMETHOD(device_probe,		tegra_sdhci_probe),
438 	DEVMETHOD(device_attach,	tegra_sdhci_attach),
439 	DEVMETHOD(device_detach,	tegra_sdhci_detach),
440 
441 	/* Bus interface */
442 	DEVMETHOD(bus_read_ivar,	sdhci_generic_read_ivar),
443 	DEVMETHOD(bus_write_ivar,	sdhci_generic_write_ivar),
444 
445 	/* MMC bridge interface */
446 	DEVMETHOD(mmcbr_update_ios,	sdhci_generic_update_ios),
447 	DEVMETHOD(mmcbr_request,	sdhci_generic_request),
448 	DEVMETHOD(mmcbr_get_ro,		tegra_sdhci_get_ro),
449 	DEVMETHOD(mmcbr_acquire_host,	sdhci_generic_acquire_host),
450 	DEVMETHOD(mmcbr_release_host,	sdhci_generic_release_host),
451 
452 	/* SDHCI registers accessors */
453 	DEVMETHOD(sdhci_read_1,		tegra_sdhci_read_1),
454 	DEVMETHOD(sdhci_read_2,		tegra_sdhci_read_2),
455 	DEVMETHOD(sdhci_read_4,		tegra_sdhci_read_4),
456 	DEVMETHOD(sdhci_read_multi_4,	tegra_sdhci_read_multi_4),
457 	DEVMETHOD(sdhci_write_1,	tegra_sdhci_write_1),
458 	DEVMETHOD(sdhci_write_2,	tegra_sdhci_write_2),
459 	DEVMETHOD(sdhci_write_4,	tegra_sdhci_write_4),
460 	DEVMETHOD(sdhci_write_multi_4,	tegra_sdhci_write_multi_4),
461 	DEVMETHOD(sdhci_get_card_present, tegra_sdhci_get_card_present),
462 
463 	DEVMETHOD_END
464 };
465 
466 static DEFINE_CLASS_0(sdhci, tegra_sdhci_driver, tegra_sdhci_methods,
467     sizeof(struct tegra_sdhci_softc));
468 DRIVER_MODULE(sdhci_tegra, simplebus, tegra_sdhci_driver, NULL, NULL);
469 SDHCI_DEPEND(sdhci_tegra);
470 #ifndef MMCCAM
471 MMC_DECLARE_BRIDGE(sdhci);
472 #endif
473