2 * Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
31 * SDHCI driver glue for Freescale i.MX SoC and QorIQ families.
33 * This supports both eSDHC (earlier SoCs) and uSDHC (more recent SoCs).
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/types.h>
40 #include <sys/callout.h>
41 #include <sys/endian.h>
42 #include <sys/kernel.h>
43 #include <sys/libkern.h>
45 #include <sys/malloc.h>
46 #include <sys/module.h>
47 #include <sys/mutex.h>
48 #include <sys/resource.h>
50 #include <sys/sysctl.h>
51 #include <sys/taskqueue.h>
54 #include <machine/bus.h>
55 #include <machine/resource.h>
57 #include <machine/intr.h>
59 #include <arm/freescale/imx/imx_ccmvar.h>
62 #include <dev/ofw/ofw_bus.h>
63 #include <dev/ofw/ofw_bus_subr.h>
65 #include <dev/mmc/bridge.h>
66 #include <dev/mmc/mmcreg.h>
67 #include <dev/mmc/mmcbrvar.h>
69 #include <dev/sdhci/sdhci.h>
72 struct fsl_sdhci_softc {
74 struct resource * mem_res;
75 struct resource * irq_res;
77 struct sdhci_slot slot;
78 struct callout r1bfix_callout;
79 sbintime_t r1bfix_timeout_at;
81 uint32_t cmd_and_mode;
82 uint32_t r1bfix_intmask;
83 boolean_t force_card_present;
84 uint16_t sdclockreg_freq_bits;
89 #define R1BFIX_NONE 0 /* No fix needed at next interrupt. */
90 #define R1BFIX_NODATA 1 /* Synthesize DATA_END for R1B w/o data. */
91 #define R1BFIX_AC12 2 /* Wait for busy after auto command 12. */
93 #define HWTYPE_NONE 0 /* Hardware not recognized/supported. */
94 #define HWTYPE_ESDHC 1 /* fsl5x and earlier. */
95 #define HWTYPE_USDHC 2 /* fsl6. */
98 * Freescale-specific registers, or in some cases the layout of bits within the
99 * sdhci-defined register is different on Freescale. These names all begin with
100 * SDHC_ (not SDHCI_).
103 #define SDHC_WTMK_LVL 0x44 /* Watermark Level register. */
104 #define USDHC_MIX_CONTROL 0x48 /* Mix(ed) Control register. */
105 #define SDHC_VEND_SPEC 0xC0 /* Vendor-specific register. */
106 #define SDHC_VEND_FRC_SDCLK_ON (1 << 8)
107 #define SDHC_VEND_IPGEN (1 << 11)
108 #define SDHC_VEND_HCKEN (1 << 12)
109 #define SDHC_VEND_PEREN (1 << 13)
111 #define SDHC_PRES_STATE 0x24
112 #define SDHC_PRES_CIHB (1 << 0)
113 #define SDHC_PRES_CDIHB (1 << 1)
114 #define SDHC_PRES_DLA (1 << 2)
115 #define SDHC_PRES_SDSTB (1 << 3)
116 #define SDHC_PRES_IPGOFF (1 << 4)
117 #define SDHC_PRES_HCKOFF (1 << 5)
118 #define SDHC_PRES_PEROFF (1 << 6)
119 #define SDHC_PRES_SDOFF (1 << 7)
120 #define SDHC_PRES_WTA (1 << 8)
121 #define SDHC_PRES_RTA (1 << 9)
122 #define SDHC_PRES_BWEN (1 << 10)
123 #define SDHC_PRES_BREN (1 << 11)
124 #define SDHC_PRES_RTR (1 << 12)
125 #define SDHC_PRES_CINST (1 << 16)
126 #define SDHC_PRES_CDPL (1 << 18)
127 #define SDHC_PRES_WPSPL (1 << 19)
128 #define SDHC_PRES_CLSL (1 << 23)
129 #define SDHC_PRES_DLSL_SHIFT 24
130 #define SDHC_PRES_DLSL_MASK (0xffU << SDHC_PRES_DLSL_SHIFT)
132 #define SDHC_PROT_CTRL 0x28
133 #define SDHC_PROT_LED (1 << 0)
134 #define SDHC_PROT_WIDTH_1BIT (0 << 1)
135 #define SDHC_PROT_WIDTH_4BIT (1 << 1)
136 #define SDHC_PROT_WIDTH_8BIT (2 << 1)
137 #define SDHC_PROT_WIDTH_MASK (3 << 1)
138 #define SDHC_PROT_D3CD (1 << 3)
139 #define SDHC_PROT_EMODE_BIG (0 << 4)
140 #define SDHC_PROT_EMODE_HALF (1 << 4)
141 #define SDHC_PROT_EMODE_LITTLE (2 << 4)
142 #define SDHC_PROT_EMODE_MASK (3 << 4)
143 #define SDHC_PROT_SDMA (0 << 8)
144 #define SDHC_PROT_ADMA1 (1 << 8)
145 #define SDHC_PROT_ADMA2 (2 << 8)
146 #define SDHC_PROT_ADMA264 (3 << 8)
147 #define SDHC_PROT_DMA_MASK (3 << 8)
148 #define SDHC_PROT_CDTL (1 << 6)
149 #define SDHC_PROT_CDSS (1 << 7)
151 #define SDHC_SYS_CTRL 0x2c
154 * The clock enable bits exist in different registers for ESDHC vs USDHC, but
155 * they are the same bits in both cases. The divisor values go into the
156 * standard sdhci clock register, but in different bit positions and meanings
157 than the sdhci spec values.
159 #define SDHC_CLK_IPGEN (1 << 0)
160 #define SDHC_CLK_HCKEN (1 << 1)
161 #define SDHC_CLK_PEREN (1 << 2)
162 #define SDHC_CLK_SDCLKEN (1 << 3)
163 #define SDHC_CLK_ENABLE_MASK 0x0000000f
164 #define SDHC_CLK_DIVISOR_MASK 0x000000f0
165 #define SDHC_CLK_DIVISOR_SHIFT 4
166 #define SDHC_CLK_PRESCALE_MASK 0x0000ff00
167 #define SDHC_CLK_PRESCALE_SHIFT 8
169 static struct ofw_compat_data compat_data[] = {
170 {"fsl,imx6q-usdhc", HWTYPE_USDHC},
171 {"fsl,imx6sl-usdhc", HWTYPE_USDHC},
172 {"fsl,imx53-esdhc", HWTYPE_ESDHC},
173 {"fsl,imx51-esdhc", HWTYPE_ESDHC},
174 {"fsl,esdhc", HWTYPE_ESDHC},
178 static uint16_t fsl_sdhc_get_clock(struct fsl_sdhci_softc *sc);
179 static void fsl_sdhc_set_clock(struct fsl_sdhci_softc *sc, uint16_t val);
180 static void fsl_sdhci_r1bfix_func(void *arg);
182 static inline uint32_t
183 RD4(struct fsl_sdhci_softc *sc, bus_size_t off)
186 return (bus_read_4(sc->mem_res, off));
190 WR4(struct fsl_sdhci_softc *sc, bus_size_t off, uint32_t val)
193 bus_write_4(sc->mem_res, off, val);
197 fsl_sdhci_read_1(device_t dev, struct sdhci_slot *slot, bus_size_t off)
199 struct fsl_sdhci_softc *sc = device_get_softc(dev);
200 uint32_t val32, wrk32;
203 * Most of the things in the standard host control register are in the
204 * hardware's wider protocol control register, but some of the bits are
207 if (off == SDHCI_HOST_CONTROL) {
208 wrk32 = RD4(sc, SDHC_PROT_CTRL);
209 val32 = wrk32 & (SDHCI_CTRL_LED | SDHCI_CTRL_CARD_DET |
210 SDHCI_CTRL_FORCE_CARD);
211 switch (wrk32 & SDHC_PROT_WIDTH_MASK) {
212 case SDHC_PROT_WIDTH_1BIT:
213 /* Value is already 0. */
215 case SDHC_PROT_WIDTH_4BIT:
216 val32 |= SDHCI_CTRL_4BITBUS;
218 case SDHC_PROT_WIDTH_8BIT:
219 val32 |= SDHCI_CTRL_8BITBUS;
222 switch (wrk32 & SDHC_PROT_DMA_MASK) {
224 /* Value is already 0. */
226 case SDHC_PROT_ADMA1:
227 /* This value is deprecated, should never appear. */
229 case SDHC_PROT_ADMA2:
230 val32 |= SDHCI_CTRL_ADMA2;
232 case SDHC_PROT_ADMA264:
233 val32 |= SDHCI_CTRL_ADMA264;
240 * XXX can't find the bus power on/off knob. For now we have to say the
241 * power is always on and always set to the same voltage.
243 if (off == SDHCI_POWER_CONTROL) {
244 return (SDHCI_POWER_ON | SDHCI_POWER_300);
248 return ((RD4(sc, off & ~3) >> (off & 3) * 8) & 0xff);
252 fsl_sdhci_read_2(device_t dev, struct sdhci_slot *slot, bus_size_t off)
254 struct fsl_sdhci_softc *sc = device_get_softc(dev);
257 if (sc->hwtype == HWTYPE_USDHC) {
259 * The USDHC hardware has nothing in the version register, but
260 * it's v3 compatible with all our translation code.
262 if (off == SDHCI_HOST_VERSION) {
263 return (SDHCI_SPEC_300 << SDHCI_SPEC_VER_SHIFT);
266 * The USDHC hardware moved the transfer mode bits to the mixed
267 * control register, fetch them from there.
269 if (off == SDHCI_TRANSFER_MODE)
270 return (RD4(sc, USDHC_MIX_CONTROL) & 0x37);
272 } else if (sc->hwtype == HWTYPE_ESDHC) {
275 * The ESDHC hardware has the typical 32-bit combined "command
276 * and mode" register that we have to cache so that command
277 * isn't written until after mode. On a read, just retrieve the
278 * cached values last written.
280 if (off == SDHCI_TRANSFER_MODE) {
281 return (sc->cmd_and_mode & 0x0000ffff);
282 } else if (off == SDHCI_COMMAND_FLAGS) {
283 return (sc->cmd_and_mode >> 16);
288 * This hardware only manages one slot. Synthesize a slot interrupt
289 * status register... if there are any enabled interrupts active they
290 * must be coming from our one and only slot.
292 if (off == SDHCI_SLOT_INT_STATUS) {
293 val32 = RD4(sc, SDHCI_INT_STATUS);
294 val32 &= RD4(sc, SDHCI_SIGNAL_ENABLE);
295 return (val32 ? 1 : 0);
299 * Clock bits are scattered into various registers which differ by
300 * hardware type, complex enough to have their own function.
302 if (off == SDHCI_CLOCK_CONTROL) {
303 return (fsl_sdhc_get_clock(sc));
306 return ((RD4(sc, off & ~3) >> (off & 3) * 8) & 0xffff);
310 fsl_sdhci_read_4(device_t dev, struct sdhci_slot *slot, bus_size_t off)
312 struct fsl_sdhci_softc *sc = device_get_softc(dev);
313 uint32_t val32, wrk32;
315 val32 = RD4(sc, off);
318 * The hardware leaves the base clock frequency out of the capabilities
319 * register, but we filled it in by setting slot->max_clk at attach time
320 * rather than here, because we can't represent frequencies above 63MHz
321 * in an sdhci 2.0 capabliities register. The timeout clock is the same
322 * as the active output sdclock; we indicate that with a quirk setting
323 * so don't populate the timeout frequency bits.
325 * XXX Turn off (for now) features the hardware can do but this driver
326 * doesn't yet handle (1.8v, suspend/resume, etc).
328 if (off == SDHCI_CAPABILITIES) {
329 val32 &= ~SDHCI_CAN_VDD_180;
330 val32 &= ~SDHCI_CAN_DO_SUSPEND;
331 val32 |= SDHCI_CAN_DO_8BITBUS;
336 * The hardware moves bits around in the present state register to make
337 * room for all 8 data line state bits. To translate, mask out all the
338 * bits which are not in the same position in both registers (this also
339 * masks out some Freescale-specific bits in locations defined as
340 * reserved by sdhci), then shift the data line and retune request bits
341 * down to their standard locations.
343 if (off == SDHCI_PRESENT_STATE) {
346 val32 |= (wrk32 >> 4) & SDHCI_STATE_DAT_MASK;
347 val32 |= (wrk32 >> 9) & SDHCI_RETUNE_REQUEST;
348 if (sc->force_card_present)
349 val32 |= SDHCI_CARD_PRESENT;
354 * fsl_sdhci_intr() can synthesize a DATA_END interrupt following a
355 * command with an R1B response, mix it into the hardware status.
357 if (off == SDHCI_INT_STATUS) {
358 return (val32 | sc->r1bfix_intmask);
365 fsl_sdhci_read_multi_4(device_t dev, struct sdhci_slot *slot, bus_size_t off,
366 uint32_t *data, bus_size_t count)
368 struct fsl_sdhci_softc *sc = device_get_softc(dev);
370 bus_read_multi_4(sc->mem_res, off, data, count);
374 fsl_sdhci_write_1(device_t dev, struct sdhci_slot *slot, bus_size_t off, uint8_t val)
376 struct fsl_sdhci_softc *sc = device_get_softc(dev);
380 * Most of the things in the standard host control register are in the
381 * hardware's wider protocol control register, but some of the bits are
384 if (off == SDHCI_HOST_CONTROL) {
385 val32 = RD4(sc, SDHC_PROT_CTRL);
386 val32 &= ~(SDHC_PROT_LED | SDHC_PROT_DMA_MASK |
387 SDHC_PROT_WIDTH_MASK | SDHC_PROT_CDTL | SDHC_PROT_CDSS);
388 val32 |= (val & SDHCI_CTRL_LED);
389 if (val & SDHCI_CTRL_8BITBUS)
390 val32 |= SDHC_PROT_WIDTH_8BIT;
392 val32 |= (val & SDHCI_CTRL_4BITBUS);
393 val32 |= (val & (SDHCI_CTRL_SDMA | SDHCI_CTRL_ADMA2)) << 4;
394 val32 |= (val & (SDHCI_CTRL_CARD_DET | SDHCI_CTRL_FORCE_CARD));
395 WR4(sc, SDHC_PROT_CTRL, val32);
399 /* XXX I can't find the bus power on/off knob; do nothing. */
400 if (off == SDHCI_POWER_CONTROL) {
404 /* XXX Reset doesn't seem to work as expected. Do nothing for now. */
405 if (off == SDHCI_SOFTWARE_RESET)
409 val32 = RD4(sc, off & ~3);
410 val32 &= ~(0xff << (off & 3) * 8);
411 val32 |= (val << (off & 3) * 8);
413 WR4(sc, off & ~3, val32);
417 fsl_sdhci_write_2(device_t dev, struct sdhci_slot *slot, bus_size_t off, uint16_t val)
419 struct fsl_sdhci_softc *sc = device_get_softc(dev);
423 * The clock control stuff is complex enough to have its own function
424 * that can handle the ESDHC versus USDHC differences.
426 if (off == SDHCI_CLOCK_CONTROL) {
427 fsl_sdhc_set_clock(sc, val);
432 * Figure out whether we need to check the DAT0 line for busy status at
433 * interrupt time. The controller should be doing this, but for some
434 * reason it doesn't. There are two cases:
435 * - R1B response with no data transfer should generate a DATA_END (aka
436 * TRANSFER_COMPLETE) interrupt after waiting for busy, but if
437 * there's no data transfer there's no DATA_END interrupt. This is
438 * documented; they seem to think it's a feature.
439 * - R1B response after Auto-CMD12 appears to not work, even though
440 * there's a control bit for it (bit 3) in the vendor register.
441 * When we're starting a command that needs a manual DAT0 line check at
442 * interrupt time, we leave ourselves a note in r1bfix_type so that we
443 * can do the extra work in fsl_sdhci_intr().
445 if (off == SDHCI_COMMAND_FLAGS) {
446 if (val & SDHCI_CMD_DATA) {
447 const uint32_t MBAUTOCMD = SDHCI_TRNS_ACMD12 | SDHCI_TRNS_MULTI;
448 val32 = RD4(sc, USDHC_MIX_CONTROL);
449 if ((val32 & MBAUTOCMD) == MBAUTOCMD)
450 sc->r1bfix_type = R1BFIX_AC12;
452 if ((val & SDHCI_CMD_RESP_MASK) == SDHCI_CMD_RESP_SHORT_BUSY) {
453 WR4(sc, SDHCI_INT_ENABLE, slot->intmask | SDHCI_INT_RESPONSE);
454 WR4(sc, SDHCI_SIGNAL_ENABLE, slot->intmask | SDHCI_INT_RESPONSE);
455 sc->r1bfix_type = R1BFIX_NODATA;
461 * The USDHC hardware moved the transfer mode bits to mixed control; we
462 * just write them there and we're done. The ESDHC hardware has the
463 * typical combined cmd-and-mode register that allows only 32-bit
464 * access, so when writing the mode bits just save them, then later when
465 * writing the command bits, add in the saved mode bits.
467 if (sc->hwtype == HWTYPE_USDHC) {
468 if (off == SDHCI_TRANSFER_MODE) {
469 val32 = RD4(sc, USDHC_MIX_CONTROL);
472 // XXX acmd23 not supported here (or by sdhci driver)
473 WR4(sc, USDHC_MIX_CONTROL, val32);
476 } else if (sc->hwtype == HWTYPE_ESDHC) {
477 if (off == SDHCI_TRANSFER_MODE) {
479 (sc->cmd_and_mode & 0xffff0000) | val;
481 } else if (off == SDHCI_COMMAND_FLAGS) {
483 (sc->cmd_and_mode & 0xffff) | (val << 16);
484 WR4(sc, SDHCI_TRANSFER_MODE, sc->cmd_and_mode);
489 val32 = RD4(sc, off & ~3);
490 val32 &= ~(0xffff << (off & 3) * 8);
491 val32 |= ((val & 0xffff) << (off & 3) * 8);
492 WR4(sc, off & ~3, val32);
496 fsl_sdhci_write_4(device_t dev, struct sdhci_slot *slot, bus_size_t off, uint32_t val)
498 struct fsl_sdhci_softc *sc = device_get_softc(dev);
500 /* Clear synthesized interrupts, then pass the value to the hardware. */
501 if (off == SDHCI_INT_STATUS) {
502 sc->r1bfix_intmask &= ~val;
509 fsl_sdhci_write_multi_4(device_t dev, struct sdhci_slot *slot, bus_size_t off,
510 uint32_t *data, bus_size_t count)
512 struct fsl_sdhci_softc *sc = device_get_softc(dev);
514 bus_write_multi_4(sc->mem_res, off, data, count);
518 fsl_sdhc_get_clock(struct fsl_sdhci_softc *sc)
523 * Whenever the sdhci driver writes the clock register we save a
524 * snapshot of just the frequency bits, so that we can play them back
525 * here on a register read without recalculating the frequency from the
526 * prescalar and divisor bits in the real register. We'll start with
527 * those bits, and mix in the clock status and enable bits that come
528 * from different places depending on which hardware we've got.
530 val = sc->sdclockreg_freq_bits;
533 * The internal clock is always enabled (actually, the hardware manages
534 * it). Whether the internal clock is stable yet after a frequency
535 * change comes from the present-state register on both hardware types.
537 val |= SDHCI_CLOCK_INT_EN;
538 if (RD4(sc, SDHC_PRES_STATE) & SDHC_PRES_SDSTB)
539 val |= SDHCI_CLOCK_INT_STABLE;
542 * On i.MX ESDHC hardware the card bus clock enable is in the usual
543 * sdhci register but it's a different bit, so transcribe it (note the
544 * difference between standard SDHCI_ and Freescale SDHC_ prefixes
545 * here). On USDHC and QorIQ ESDHC hardware there is a force-on bit, but
546 * no force-off for the card bus clock (the hardware runs the clock when
547 * transfers are active no matter what), so we always say the clock is
549 * XXX Maybe we should say it's in whatever state the sdhci driver last
552 if (sc->hwtype == HWTYPE_ESDHC) {
554 if (RD4(sc, SDHC_SYS_CTRL) & SDHC_CLK_SDCLKEN)
556 val |= SDHCI_CLOCK_CARD_EN;
558 val |= SDHCI_CLOCK_CARD_EN;
565 fsl_sdhc_set_clock(struct fsl_sdhci_softc *sc, uint16_t val)
567 uint32_t divisor, freq, prescale, val32;
569 val32 = RD4(sc, SDHCI_CLOCK_CONTROL);
572 * Save the frequency-setting bits in SDHCI format so that we can play
573 * them back in get_clock without complex decoding of hardware regs,
574 * then deal with the freqency part of the value based on hardware type.
576 sc->sdclockreg_freq_bits = val & SDHCI_DIVIDERS_MASK;
577 if (sc->hwtype == HWTYPE_ESDHC) {
579 * The i.MX5 ESDHC hardware requires the driver to manually
580 * start and stop the sd bus clock. If the enable bit is not
581 * set, turn off the clock in hardware and we're done, otherwise
582 * decode the requested frequency. ESDHC hardware is sdhci 2.0;
583 * the sdhci driver will use the original 8-bit divisor field
584 * and the "base / 2^N" divisor scheme.
586 if ((val & SDHCI_CLOCK_CARD_EN) == 0) {
588 /* On QorIQ, this is a reserved bit. */
589 WR4(sc, SDHCI_CLOCK_CONTROL, val32 & ~SDHC_CLK_SDCLKEN);
594 divisor = (val >> SDHCI_DIVIDER_SHIFT) & SDHCI_DIVIDER_MASK;
595 freq = sc->baseclk_hz >> ffs(divisor);
598 * The USDHC hardware provides only "force always on" control
599 * over the sd bus clock, but no way to turn it off. (If a cmd
600 * or data transfer is in progress the clock is on, otherwise it
601 * is off.) If the clock is being disabled, we can just return
602 * now, otherwise we decode the requested frequency. USDHC
603 * hardware is sdhci 3.0; the sdhci driver will use a 10-bit
604 * divisor using the "base / 2*N" divisor scheme.
606 if ((val & SDHCI_CLOCK_CARD_EN) == 0)
608 divisor = ((val >> SDHCI_DIVIDER_SHIFT) & SDHCI_DIVIDER_MASK) |
609 ((val >> SDHCI_DIVIDER_HI_SHIFT) & SDHCI_DIVIDER_HI_MASK) <<
610 SDHCI_DIVIDER_MASK_LEN;
612 freq = sc->baseclk_hz;
614 freq = sc->baseclk_hz / (2 * divisor);
618 * Get a prescaler and final divisor to achieve the desired frequency.
620 for (prescale = 2; freq < sc->baseclk_hz / (prescale * 16);)
623 for (divisor = 1; freq < sc->baseclk_hz / (prescale * divisor);)
627 device_printf(sc->dev,
628 "desired SD freq: %d, actual: %d; base %d prescale %d divisor %d\n",
629 freq, sc->baseclk_hz / (prescale * divisor), sc->baseclk_hz,
634 * Adjust to zero-based values, and store them to the hardware.
639 val32 &= ~(SDHC_CLK_DIVISOR_MASK | SDHC_CLK_PRESCALE_MASK);
640 val32 |= divisor << SDHC_CLK_DIVISOR_SHIFT;
641 val32 |= prescale << SDHC_CLK_PRESCALE_SHIFT;
642 val32 |= SDHC_CLK_IPGEN;
643 WR4(sc, SDHCI_CLOCK_CONTROL, val32);
647 fsl_sdhci_r1bfix_is_wait_done(struct fsl_sdhci_softc *sc)
651 mtx_assert(&sc->slot.mtx, MA_OWNED);
654 * Check the DAT0 line status using both the DLA (data line active) and
655 * CDIHB (data inhibit) bits in the present state register. In theory
656 * just DLA should do the trick, but in practice it takes both. If the
657 * DAT0 line is still being held and we're not yet beyond the timeout
658 * point, just schedule another callout to check again later.
660 inhibit = RD4(sc, SDHC_PRES_STATE) & (SDHC_PRES_DLA | SDHC_PRES_CDIHB);
662 if (inhibit && getsbinuptime() < sc->r1bfix_timeout_at) {
663 callout_reset_sbt(&sc->r1bfix_callout, SBT_1MS, 0,
664 fsl_sdhci_r1bfix_func, sc, 0);
669 * If we reach this point with the inhibit bits still set, we've got a
670 * timeout, synthesize a DATA_TIMEOUT interrupt. Otherwise the DAT0
671 * line has been released, and we synthesize a DATA_END, and if the type
672 * of fix needed was on a command-without-data we also now add in the
673 * original INT_RESPONSE that we suppressed earlier.
676 sc->r1bfix_intmask |= SDHCI_INT_DATA_TIMEOUT;
678 sc->r1bfix_intmask |= SDHCI_INT_DATA_END;
679 if (sc->r1bfix_type == R1BFIX_NODATA)
680 sc->r1bfix_intmask |= SDHCI_INT_RESPONSE;
683 sc->r1bfix_type = R1BFIX_NONE;
688 fsl_sdhci_r1bfix_func(void * arg)
690 struct fsl_sdhci_softc *sc = arg;
691 boolean_t r1bwait_done;
693 mtx_lock(&sc->slot.mtx);
694 r1bwait_done = fsl_sdhci_r1bfix_is_wait_done(sc);
695 mtx_unlock(&sc->slot.mtx);
697 sdhci_generic_intr(&sc->slot);
701 fsl_sdhci_intr(void *arg)
703 struct fsl_sdhci_softc *sc = arg;
706 mtx_lock(&sc->slot.mtx);
709 * Manually check the DAT0 line for R1B response types that the
710 * controller fails to handle properly. The controller asserts the done
711 * interrupt while the card is still asserting busy with the DAT0 line.
713 * We check DAT0 immediately because most of the time, especially on a
714 * read, the card will actually be done by time we get here. If it's
715 * not, then the wait_done routine will schedule a callout to re-check
716 * periodically until it is done. In that case we clear the interrupt
717 * out of the hardware now so that we can present it later when the DAT0
720 * If we need to wait for the DAT0 line to be released, we set up a
721 * timeout point 250ms in the future. This number comes from the SD
722 * spec, which allows a command to take that long. In the real world,
723 * cards tend to take 10-20ms for a long-running command such as a write
724 * or erase that spans two pages.
726 switch (sc->r1bfix_type) {
728 intmask = RD4(sc, SDHCI_INT_STATUS) & SDHCI_INT_RESPONSE;
731 intmask = RD4(sc, SDHCI_INT_STATUS) & SDHCI_INT_DATA_END;
738 sc->r1bfix_timeout_at = getsbinuptime() + 250 * SBT_1MS;
739 if (!fsl_sdhci_r1bfix_is_wait_done(sc)) {
740 WR4(sc, SDHCI_INT_STATUS, intmask);
741 bus_barrier(sc->mem_res, SDHCI_INT_STATUS, 4,
742 BUS_SPACE_BARRIER_WRITE);
746 mtx_unlock(&sc->slot.mtx);
747 sdhci_generic_intr(&sc->slot);
751 fsl_sdhci_get_ro(device_t bus, device_t child)
753 struct fsl_sdhci_softc *sc = device_get_softc(bus);
755 if (RD4(sc, SDHCI_PRESENT_STATE) & SDHC_PRES_WPSPL)
762 fsl_sdhci_get_platform_clock(device_t dev)
768 node = ofw_bus_get_node(dev);
770 /* Get sdhci node properties */
771 if((OF_getprop(node, "clock-frequency", (void *)&clock,
772 sizeof(clock)) <= 0) || (clock == 0)) {
775 * Trying to get clock from parent device (soc) if correct
776 * clock cannot be acquired from sdhci node.
778 parent = device_get_parent(dev);
779 node = ofw_bus_get_node(parent);
781 /* Get soc properties */
782 if ((OF_getprop(node, "bus-frequency", (void *)&clock,
783 sizeof(clock)) <= 0) || (clock == 0)) {
784 device_printf(dev,"Cannot acquire correct sdhci "
785 "frequency from DTS.\n");
789 /* eSDHC clock is 1/2 platform clock. */
794 device_printf(dev, "Acquired clock: %d from DTS\n", clock);
802 fsl_sdhci_detach(device_t dev)
809 fsl_sdhci_attach(device_t dev)
811 struct fsl_sdhci_softc *sc = device_get_softc(dev);
820 sc->hwtype = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
821 if (sc->hwtype == HWTYPE_NONE)
822 panic("Impossible: not compatible in fsl_sdhci_attach()");
825 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
828 device_printf(dev, "cannot allocate memory window\n");
834 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
837 device_printf(dev, "cannot allocate interrupt\n");
842 if (bus_setup_intr(dev, sc->irq_res, INTR_TYPE_BIO | INTR_MPSAFE,
843 NULL, fsl_sdhci_intr, sc, &sc->intr_cookie)) {
844 device_printf(dev, "cannot setup interrupt handler\n");
849 sc->slot.quirks |= SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK;
852 * DMA is not really broken, I just haven't implemented it yet.
854 sc->slot.quirks |= SDHCI_QUIRK_BROKEN_DMA;
857 * Set the buffer watermark level to 128 words (512 bytes) for both read
858 * and write. The hardware has a restriction that when the read or
859 * write ready status is asserted, that means you can read exactly the
860 * number of words set in the watermark register before you have to
861 * re-check the status and potentially wait for more data. The main
862 * sdhci driver provides no hook for doing status checking on less than
863 * a full block boundary, so we set the watermark level to be a full
864 * block. Reads and writes where the block size is less than the
865 * watermark size will work correctly too, no need to change the
866 * watermark for different size blocks. However, 128 is the maximum
867 * allowed for the watermark, so PIO is limitted to 512 byte blocks
868 * (which works fine for SD cards, may be a problem for SDIO some day).
870 * XXX need named constants for this stuff.
872 /* P1022 has the '*_BRST_LEN' fields as reserved, always reading 0x10 */
873 if (ofw_bus_is_compatible(dev, "fsl,p1022-esdhc"))
874 WR4(sc, SDHC_WTMK_LVL, 0x10801080);
876 WR4(sc, SDHC_WTMK_LVL, 0x08800880);
879 * We read in native byte order in the main driver, but the register
880 * defaults to little endian.
883 sc->baseclk_hz = fsl_sdhci_get_platform_clock(dev);
885 sc->baseclk_hz = imx_ccm_sdhci_hz();
887 sc->slot.max_clk = sc->baseclk_hz;
890 * If the slot is flagged with the non-removable property, set our flag
891 * to always force the SDHCI_CARD_PRESENT bit on.
893 * XXX Workaround for gpio-based card detect...
895 * We don't have gpio support yet. If there's a cd-gpios property just
896 * force the SDHCI_CARD_PRESENT bit on for now. If there isn't really a
897 * card there it will fail to probe at the mmc layer and nothing bad
898 * happens except instantiating an mmcN device for an empty slot.
900 node = ofw_bus_get_node(dev);
901 if (OF_hasprop(node, "non-removable"))
902 sc->force_card_present = true;
903 else if (OF_hasprop(node, "cd-gpios")) {
904 /* XXX put real gpio hookup here. */
905 sc->force_card_present = true;
908 /* Default to big-endian on powerpc */
909 protctl = RD4(sc, SDHC_PROT_CTRL);
910 protctl &= ~SDHC_PROT_EMODE_MASK;
911 if (OF_hasprop(node, "little-endian"))
912 protctl |= SDHC_PROT_EMODE_LITTLE;
914 protctl |= SDHC_PROT_EMODE_BIG;
915 WR4(sc, SDHC_PROT_CTRL, protctl);
918 callout_init(&sc->r1bfix_callout, 1);
919 sdhci_init_slot(dev, &sc->slot, 0);
921 bus_generic_probe(dev);
922 bus_generic_attach(dev);
924 sdhci_start_slot(&sc->slot);
930 bus_teardown_intr(dev, sc->irq_res, sc->intr_cookie);
932 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
934 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res);
940 fsl_sdhci_probe(device_t dev)
943 if (!ofw_bus_status_okay(dev))
946 switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
948 device_set_desc(dev, "Freescale eSDHC controller");
949 return (BUS_PROBE_DEFAULT);
951 device_set_desc(dev, "Freescale uSDHC controller");
952 return (BUS_PROBE_DEFAULT);
959 static device_method_t fsl_sdhci_methods[] = {
960 /* Device interface */
961 DEVMETHOD(device_probe, fsl_sdhci_probe),
962 DEVMETHOD(device_attach, fsl_sdhci_attach),
963 DEVMETHOD(device_detach, fsl_sdhci_detach),
966 DEVMETHOD(bus_read_ivar, sdhci_generic_read_ivar),
967 DEVMETHOD(bus_write_ivar, sdhci_generic_write_ivar),
968 DEVMETHOD(bus_print_child, bus_generic_print_child),
970 /* MMC bridge interface */
971 DEVMETHOD(mmcbr_update_ios, sdhci_generic_update_ios),
972 DEVMETHOD(mmcbr_request, sdhci_generic_request),
973 DEVMETHOD(mmcbr_get_ro, fsl_sdhci_get_ro),
974 DEVMETHOD(mmcbr_acquire_host, sdhci_generic_acquire_host),
975 DEVMETHOD(mmcbr_release_host, sdhci_generic_release_host),
977 /* SDHCI registers accessors */
978 DEVMETHOD(sdhci_read_1, fsl_sdhci_read_1),
979 DEVMETHOD(sdhci_read_2, fsl_sdhci_read_2),
980 DEVMETHOD(sdhci_read_4, fsl_sdhci_read_4),
981 DEVMETHOD(sdhci_read_multi_4, fsl_sdhci_read_multi_4),
982 DEVMETHOD(sdhci_write_1, fsl_sdhci_write_1),
983 DEVMETHOD(sdhci_write_2, fsl_sdhci_write_2),
984 DEVMETHOD(sdhci_write_4, fsl_sdhci_write_4),
985 DEVMETHOD(sdhci_write_multi_4, fsl_sdhci_write_multi_4),
990 static devclass_t fsl_sdhci_devclass;
992 static driver_t fsl_sdhci_driver = {
995 sizeof(struct fsl_sdhci_softc),
998 DRIVER_MODULE(sdhci_fsl, simplebus, fsl_sdhci_driver, fsl_sdhci_devclass, 0, 0);
999 MODULE_DEPEND(sdhci_fsl, sdhci, 1, 1, 1);
1000 DRIVER_MODULE(mmc, sdhci_fsl, mmc_driver, mmc_devclass, NULL, NULL);
1001 MODULE_DEPEND(sdhci_fsl, mmc, 1, 1, 1);