2 * Amlogic SD/eMMC driver for the GX/S905 family SoCs
4 * Copyright (c) 2016 BayLibre, SAS.
5 * Author: Kevin Hilman <khilman@baylibre.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 * The full GNU General Public License is included in this distribution
19 * in the file called COPYING.
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/device.h>
25 #include <linux/of_device.h>
26 #include <linux/platform_device.h>
27 #include <linux/ioport.h>
28 #include <linux/spinlock.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/mmc/host.h>
31 #include <linux/mmc/mmc.h>
32 #include <linux/mmc/sdio.h>
33 #include <linux/mmc/slot-gpio.h>
35 #include <linux/clk.h>
36 #include <linux/clk-provider.h>
37 #include <linux/regulator/consumer.h>
38 #include <linux/interrupt.h>
39 #include <linux/bitfield.h>
41 #define DRIVER_NAME "meson-gx-mmc"
43 #define SD_EMMC_CLOCK 0x0
44 #define CLK_DIV_MASK GENMASK(5, 0)
45 #define CLK_SRC_MASK GENMASK(7, 6)
46 #define CLK_CORE_PHASE_MASK GENMASK(9, 8)
47 #define CLK_TX_PHASE_MASK GENMASK(11, 10)
48 #define CLK_RX_PHASE_MASK GENMASK(13, 12)
49 #define CLK_TX_DELAY_MASK GENMASK(19, 16)
50 #define CLK_RX_DELAY_MASK GENMASK(23, 20)
51 #define CLK_DELAY_STEP_PS 200
52 #define CLK_PHASE_STEP 30
53 #define CLK_PHASE_POINT_NUM (360 / CLK_PHASE_STEP)
54 #define CLK_ALWAYS_ON BIT(24)
56 #define SD_EMMC_DELAY 0x4
57 #define SD_EMMC_ADJUST 0x8
58 #define SD_EMMC_CALOUT 0x10
59 #define SD_EMMC_START 0x40
60 #define START_DESC_INIT BIT(0)
61 #define START_DESC_BUSY BIT(1)
62 #define START_DESC_ADDR_MASK GENMASK(31, 2)
64 #define SD_EMMC_CFG 0x44
65 #define CFG_BUS_WIDTH_MASK GENMASK(1, 0)
66 #define CFG_BUS_WIDTH_1 0x0
67 #define CFG_BUS_WIDTH_4 0x1
68 #define CFG_BUS_WIDTH_8 0x2
69 #define CFG_DDR BIT(2)
70 #define CFG_BLK_LEN_MASK GENMASK(7, 4)
71 #define CFG_RESP_TIMEOUT_MASK GENMASK(11, 8)
72 #define CFG_RC_CC_MASK GENMASK(15, 12)
73 #define CFG_STOP_CLOCK BIT(22)
74 #define CFG_CLK_ALWAYS_ON BIT(18)
75 #define CFG_CHK_DS BIT(20)
76 #define CFG_AUTO_CLK BIT(23)
78 #define SD_EMMC_STATUS 0x48
79 #define STATUS_BUSY BIT(31)
80 #define STATUS_DATI GENMASK(23, 16)
82 #define SD_EMMC_IRQ_EN 0x4c
83 #define IRQ_RXD_ERR_MASK GENMASK(7, 0)
84 #define IRQ_TXD_ERR BIT(8)
85 #define IRQ_DESC_ERR BIT(9)
86 #define IRQ_RESP_ERR BIT(10)
88 (IRQ_RXD_ERR_MASK | IRQ_TXD_ERR | IRQ_DESC_ERR | IRQ_RESP_ERR)
89 #define IRQ_RESP_TIMEOUT BIT(11)
90 #define IRQ_DESC_TIMEOUT BIT(12)
91 #define IRQ_TIMEOUTS \
92 (IRQ_RESP_TIMEOUT | IRQ_DESC_TIMEOUT)
93 #define IRQ_END_OF_CHAIN BIT(13)
94 #define IRQ_RESP_STATUS BIT(14)
95 #define IRQ_SDIO BIT(15)
97 (IRQ_CRC_ERR | IRQ_TIMEOUTS | IRQ_END_OF_CHAIN | IRQ_RESP_STATUS |\
100 #define SD_EMMC_CMD_CFG 0x50
101 #define SD_EMMC_CMD_ARG 0x54
102 #define SD_EMMC_CMD_DAT 0x58
103 #define SD_EMMC_CMD_RSP 0x5c
104 #define SD_EMMC_CMD_RSP1 0x60
105 #define SD_EMMC_CMD_RSP2 0x64
106 #define SD_EMMC_CMD_RSP3 0x68
108 #define SD_EMMC_RXD 0x94
109 #define SD_EMMC_TXD 0x94
110 #define SD_EMMC_LAST_REG SD_EMMC_TXD
112 #define SD_EMMC_CFG_BLK_SIZE 512 /* internal buffer max: 512 bytes */
113 #define SD_EMMC_CFG_RESP_TIMEOUT 256 /* in clock cycles */
114 #define SD_EMMC_CMD_TIMEOUT 1024 /* in ms */
115 #define SD_EMMC_CMD_TIMEOUT_DATA 4096 /* in ms */
116 #define SD_EMMC_CFG_CMD_GAP 16 /* in clock cycles */
117 #define SD_EMMC_DESC_BUF_LEN PAGE_SIZE
119 #define SD_EMMC_PRE_REQ_DONE BIT(0)
120 #define SD_EMMC_DESC_CHAIN_MODE BIT(1)
122 #define MUX_CLK_NUM_PARENTS 2
124 struct sd_emmc_desc
{
133 struct mmc_host
*mmc
;
134 struct mmc_command
*cmd
;
138 struct clk
*core_clk
;
142 unsigned long req_rate
;
144 struct pinctrl
*pinctrl
;
145 struct pinctrl_state
*pins_default
;
146 struct pinctrl_state
*pins_clk_gate
;
148 unsigned int bounce_buf_size
;
150 dma_addr_t bounce_dma_addr
;
151 struct sd_emmc_desc
*descs
;
152 dma_addr_t descs_dma_addr
;
157 #define CMD_CFG_LENGTH_MASK GENMASK(8, 0)
158 #define CMD_CFG_BLOCK_MODE BIT(9)
159 #define CMD_CFG_R1B BIT(10)
160 #define CMD_CFG_END_OF_CHAIN BIT(11)
161 #define CMD_CFG_TIMEOUT_MASK GENMASK(15, 12)
162 #define CMD_CFG_NO_RESP BIT(16)
163 #define CMD_CFG_NO_CMD BIT(17)
164 #define CMD_CFG_DATA_IO BIT(18)
165 #define CMD_CFG_DATA_WR BIT(19)
166 #define CMD_CFG_RESP_NOCRC BIT(20)
167 #define CMD_CFG_RESP_128 BIT(21)
168 #define CMD_CFG_RESP_NUM BIT(22)
169 #define CMD_CFG_DATA_NUM BIT(23)
170 #define CMD_CFG_CMD_INDEX_MASK GENMASK(29, 24)
171 #define CMD_CFG_ERROR BIT(30)
172 #define CMD_CFG_OWNER BIT(31)
174 #define CMD_DATA_MASK GENMASK(31, 2)
175 #define CMD_DATA_BIG_ENDIAN BIT(1)
176 #define CMD_DATA_SRAM BIT(0)
177 #define CMD_RESP_MASK GENMASK(31, 1)
178 #define CMD_RESP_SRAM BIT(0)
180 struct meson_mmc_phase
{
183 unsigned long phase_mask
;
184 unsigned long delay_mask
;
185 unsigned int delay_step_ps
;
188 #define to_meson_mmc_phase(_hw) container_of(_hw, struct meson_mmc_phase, hw)
190 static int meson_mmc_clk_get_phase(struct clk_hw
*hw
)
192 struct meson_mmc_phase
*mmc
= to_meson_mmc_phase(hw
);
193 unsigned int phase_num
= 1 << hweight_long(mmc
->phase_mask
);
194 unsigned long period_ps
, p
, d
;
198 val
= readl(mmc
->reg
);
199 p
= (val
& mmc
->phase_mask
) >> __ffs(mmc
->phase_mask
);
200 degrees
= p
* 360 / phase_num
;
202 if (mmc
->delay_mask
) {
203 period_ps
= DIV_ROUND_UP((unsigned long)NSEC_PER_SEC
* 1000,
204 clk_get_rate(hw
->clk
));
205 d
= (val
& mmc
->delay_mask
) >> __ffs(mmc
->delay_mask
);
206 degrees
+= d
* mmc
->delay_step_ps
* 360 / period_ps
;
213 static void meson_mmc_apply_phase_delay(struct meson_mmc_phase
*mmc
,
219 val
= readl(mmc
->reg
);
220 val
&= ~mmc
->phase_mask
;
221 val
|= phase
<< __ffs(mmc
->phase_mask
);
223 if (mmc
->delay_mask
) {
224 val
&= ~mmc
->delay_mask
;
225 val
|= delay
<< __ffs(mmc
->delay_mask
);
228 writel(val
, mmc
->reg
);
231 static int meson_mmc_clk_set_phase(struct clk_hw
*hw
, int degrees
)
233 struct meson_mmc_phase
*mmc
= to_meson_mmc_phase(hw
);
234 unsigned int phase_num
= 1 << hweight_long(mmc
->phase_mask
);
235 unsigned long period_ps
, d
= 0, r
;
240 if (!mmc
->delay_mask
) {
241 p
= DIV_ROUND_CLOSEST_ULL(p
, 360 / phase_num
);
243 period_ps
= DIV_ROUND_UP((unsigned long)NSEC_PER_SEC
* 1000,
244 clk_get_rate(hw
->clk
));
246 /* First compute the phase index (p), the remainder (r) is the
247 * part we'll try to acheive using the delays (d).
249 r
= do_div(p
, 360 / phase_num
);
250 d
= DIV_ROUND_CLOSEST(r
* period_ps
,
251 360 * mmc
->delay_step_ps
);
252 d
= min(d
, mmc
->delay_mask
>> __ffs(mmc
->delay_mask
));
255 meson_mmc_apply_phase_delay(mmc
, p
, d
);
259 static const struct clk_ops meson_mmc_clk_phase_ops
= {
260 .get_phase
= meson_mmc_clk_get_phase
,
261 .set_phase
= meson_mmc_clk_set_phase
,
264 static unsigned int meson_mmc_get_timeout_msecs(struct mmc_data
*data
)
266 unsigned int timeout
= data
->timeout_ns
/ NSEC_PER_MSEC
;
269 return SD_EMMC_CMD_TIMEOUT_DATA
;
271 timeout
= roundup_pow_of_two(timeout
);
273 return min(timeout
, 32768U); /* max. 2^15 ms */
276 static struct mmc_command
*meson_mmc_get_next_command(struct mmc_command
*cmd
)
278 if (cmd
->opcode
== MMC_SET_BLOCK_COUNT
&& !cmd
->error
)
279 return cmd
->mrq
->cmd
;
280 else if (mmc_op_multi(cmd
->opcode
) &&
281 (!cmd
->mrq
->sbc
|| cmd
->error
|| cmd
->data
->error
))
282 return cmd
->mrq
->stop
;
287 static void meson_mmc_get_transfer_mode(struct mmc_host
*mmc
,
288 struct mmc_request
*mrq
)
290 struct mmc_data
*data
= mrq
->data
;
291 struct scatterlist
*sg
;
293 bool use_desc_chain_mode
= true;
296 * Broken SDIO with AP6255-based WiFi on Khadas VIM Pro has been
297 * reported. For some strange reason this occurs in descriptor
298 * chain mode only. So let's fall back to bounce buffer mode
299 * for command SD_IO_RW_EXTENDED.
301 if (mrq
->cmd
->opcode
== SD_IO_RW_EXTENDED
)
304 for_each_sg(data
->sg
, sg
, data
->sg_len
, i
)
305 /* check for 8 byte alignment */
306 if (sg
->offset
& 7) {
307 WARN_ONCE(1, "unaligned scatterlist buffer\n");
308 use_desc_chain_mode
= false;
312 if (use_desc_chain_mode
)
313 data
->host_cookie
|= SD_EMMC_DESC_CHAIN_MODE
;
316 static inline bool meson_mmc_desc_chain_mode(const struct mmc_data
*data
)
318 return data
->host_cookie
& SD_EMMC_DESC_CHAIN_MODE
;
321 static inline bool meson_mmc_bounce_buf_read(const struct mmc_data
*data
)
323 return data
&& data
->flags
& MMC_DATA_READ
&&
324 !meson_mmc_desc_chain_mode(data
);
327 static void meson_mmc_pre_req(struct mmc_host
*mmc
, struct mmc_request
*mrq
)
329 struct mmc_data
*data
= mrq
->data
;
334 meson_mmc_get_transfer_mode(mmc
, mrq
);
335 data
->host_cookie
|= SD_EMMC_PRE_REQ_DONE
;
337 if (!meson_mmc_desc_chain_mode(data
))
340 data
->sg_count
= dma_map_sg(mmc_dev(mmc
), data
->sg
, data
->sg_len
,
341 mmc_get_dma_dir(data
));
343 dev_err(mmc_dev(mmc
), "dma_map_sg failed");
346 static void meson_mmc_post_req(struct mmc_host
*mmc
, struct mmc_request
*mrq
,
349 struct mmc_data
*data
= mrq
->data
;
351 if (data
&& meson_mmc_desc_chain_mode(data
) && data
->sg_count
)
352 dma_unmap_sg(mmc_dev(mmc
), data
->sg
, data
->sg_len
,
353 mmc_get_dma_dir(data
));
356 static bool meson_mmc_timing_is_ddr(struct mmc_ios
*ios
)
358 if (ios
->timing
== MMC_TIMING_MMC_DDR52
||
359 ios
->timing
== MMC_TIMING_UHS_DDR50
||
360 ios
->timing
== MMC_TIMING_MMC_HS400
)
367 * Gating the clock on this controller is tricky. It seems the mmc clock
368 * is also used by the controller. It may crash during some operation if the
369 * clock is stopped. The safest thing to do, whenever possible, is to keep
370 * clock running at stop it at the pad using the pinmux.
372 static void meson_mmc_clk_gate(struct meson_host
*host
)
376 if (host
->pins_clk_gate
) {
377 pinctrl_select_state(host
->pinctrl
, host
->pins_clk_gate
);
380 * If the pinmux is not provided - default to the classic and
383 cfg
= readl(host
->regs
+ SD_EMMC_CFG
);
384 cfg
|= CFG_STOP_CLOCK
;
385 writel(cfg
, host
->regs
+ SD_EMMC_CFG
);
389 static void meson_mmc_clk_ungate(struct meson_host
*host
)
393 if (host
->pins_clk_gate
)
394 pinctrl_select_state(host
->pinctrl
, host
->pins_default
);
396 /* Make sure the clock is not stopped in the controller */
397 cfg
= readl(host
->regs
+ SD_EMMC_CFG
);
398 cfg
&= ~CFG_STOP_CLOCK
;
399 writel(cfg
, host
->regs
+ SD_EMMC_CFG
);
402 static int meson_mmc_clk_set(struct meson_host
*host
, struct mmc_ios
*ios
)
404 struct mmc_host
*mmc
= host
->mmc
;
405 unsigned long rate
= ios
->clock
;
409 /* DDR modes require higher module clock */
410 if (meson_mmc_timing_is_ddr(ios
))
413 /* Same request - bail-out */
414 if (host
->req_rate
== rate
)
418 meson_mmc_clk_gate(host
);
422 mmc
->actual_clock
= 0;
423 /* return with clock being stopped */
427 /* Stop the clock during rate change to avoid glitches */
428 cfg
= readl(host
->regs
+ SD_EMMC_CFG
);
429 cfg
|= CFG_STOP_CLOCK
;
430 writel(cfg
, host
->regs
+ SD_EMMC_CFG
);
432 ret
= clk_set_rate(host
->mmc_clk
, rate
);
434 dev_err(host
->dev
, "Unable to set cfg_div_clk to %lu. ret=%d\n",
439 host
->req_rate
= rate
;
440 mmc
->actual_clock
= clk_get_rate(host
->mmc_clk
);
442 /* We should report the real output frequency of the controller */
443 if (meson_mmc_timing_is_ddr(ios
))
444 mmc
->actual_clock
>>= 1;
446 dev_dbg(host
->dev
, "clk rate: %u Hz\n", mmc
->actual_clock
);
447 if (ios
->clock
!= mmc
->actual_clock
)
448 dev_dbg(host
->dev
, "requested rate was %u\n", ios
->clock
);
450 /* (re)start clock */
451 meson_mmc_clk_ungate(host
);
457 * The SD/eMMC IP block has an internal mux and divider used for
458 * generating the MMC clock. Use the clock framework to create and
459 * manage these clocks.
461 static int meson_mmc_clk_init(struct meson_host
*host
)
463 struct clk_init_data init
;
465 struct clk_divider
*div
;
466 struct meson_mmc_phase
*core
, *tx
, *rx
;
470 const char *mux_parent_names
[MUX_CLK_NUM_PARENTS
];
471 const char *clk_parent
[1];
474 /* init SD_EMMC_CLOCK to sane defaults w/min clock rate */
476 clk_reg
|= CLK_ALWAYS_ON
;
477 clk_reg
|= CLK_DIV_MASK
;
478 writel(clk_reg
, host
->regs
+ SD_EMMC_CLOCK
);
480 /* get the mux parents */
481 for (i
= 0; i
< MUX_CLK_NUM_PARENTS
; i
++) {
485 snprintf(name
, sizeof(name
), "clkin%d", i
);
486 clk
= devm_clk_get(host
->dev
, name
);
488 if (clk
!= ERR_PTR(-EPROBE_DEFER
))
489 dev_err(host
->dev
, "Missing clock %s\n", name
);
493 mux_parent_names
[i
] = __clk_get_name(clk
);
497 mux
= devm_kzalloc(host
->dev
, sizeof(*mux
), GFP_KERNEL
);
501 snprintf(clk_name
, sizeof(clk_name
), "%s#mux", dev_name(host
->dev
));
502 init
.name
= clk_name
;
503 init
.ops
= &clk_mux_ops
;
505 init
.parent_names
= mux_parent_names
;
506 init
.num_parents
= MUX_CLK_NUM_PARENTS
;
508 mux
->reg
= host
->regs
+ SD_EMMC_CLOCK
;
509 mux
->shift
= __ffs(CLK_SRC_MASK
);
510 mux
->mask
= CLK_SRC_MASK
>> mux
->shift
;
511 mux
->hw
.init
= &init
;
513 clk
= devm_clk_register(host
->dev
, &mux
->hw
);
514 if (WARN_ON(IS_ERR(clk
)))
517 /* create the divider */
518 div
= devm_kzalloc(host
->dev
, sizeof(*div
), GFP_KERNEL
);
522 snprintf(clk_name
, sizeof(clk_name
), "%s#div", dev_name(host
->dev
));
523 init
.name
= clk_name
;
524 init
.ops
= &clk_divider_ops
;
525 init
.flags
= CLK_SET_RATE_PARENT
;
526 clk_parent
[0] = __clk_get_name(clk
);
527 init
.parent_names
= clk_parent
;
528 init
.num_parents
= 1;
530 div
->reg
= host
->regs
+ SD_EMMC_CLOCK
;
531 div
->shift
= __ffs(CLK_DIV_MASK
);
532 div
->width
= __builtin_popcountl(CLK_DIV_MASK
);
533 div
->hw
.init
= &init
;
534 div
->flags
= CLK_DIVIDER_ONE_BASED
;
536 clk
= devm_clk_register(host
->dev
, &div
->hw
);
537 if (WARN_ON(IS_ERR(clk
)))
540 /* create the mmc core clock */
541 core
= devm_kzalloc(host
->dev
, sizeof(*core
), GFP_KERNEL
);
545 snprintf(clk_name
, sizeof(clk_name
), "%s#core", dev_name(host
->dev
));
546 init
.name
= clk_name
;
547 init
.ops
= &meson_mmc_clk_phase_ops
;
548 init
.flags
= CLK_SET_RATE_PARENT
;
549 clk_parent
[0] = __clk_get_name(clk
);
550 init
.parent_names
= clk_parent
;
551 init
.num_parents
= 1;
553 core
->reg
= host
->regs
+ SD_EMMC_CLOCK
;
554 core
->phase_mask
= CLK_CORE_PHASE_MASK
;
555 core
->hw
.init
= &init
;
557 host
->mmc_clk
= devm_clk_register(host
->dev
, &core
->hw
);
558 if (WARN_ON(PTR_ERR_OR_ZERO(host
->mmc_clk
)))
559 return PTR_ERR(host
->mmc_clk
);
561 /* create the mmc tx clock */
562 tx
= devm_kzalloc(host
->dev
, sizeof(*tx
), GFP_KERNEL
);
566 snprintf(clk_name
, sizeof(clk_name
), "%s#tx", dev_name(host
->dev
));
567 init
.name
= clk_name
;
568 init
.ops
= &meson_mmc_clk_phase_ops
;
570 clk_parent
[0] = __clk_get_name(host
->mmc_clk
);
571 init
.parent_names
= clk_parent
;
572 init
.num_parents
= 1;
574 tx
->reg
= host
->regs
+ SD_EMMC_CLOCK
;
575 tx
->phase_mask
= CLK_TX_PHASE_MASK
;
576 tx
->delay_mask
= CLK_TX_DELAY_MASK
;
577 tx
->delay_step_ps
= CLK_DELAY_STEP_PS
;
580 host
->tx_clk
= devm_clk_register(host
->dev
, &tx
->hw
);
581 if (WARN_ON(PTR_ERR_OR_ZERO(host
->tx_clk
)))
582 return PTR_ERR(host
->tx_clk
);
584 /* create the mmc rx clock */
585 rx
= devm_kzalloc(host
->dev
, sizeof(*rx
), GFP_KERNEL
);
589 snprintf(clk_name
, sizeof(clk_name
), "%s#rx", dev_name(host
->dev
));
590 init
.name
= clk_name
;
591 init
.ops
= &meson_mmc_clk_phase_ops
;
593 clk_parent
[0] = __clk_get_name(host
->mmc_clk
);
594 init
.parent_names
= clk_parent
;
595 init
.num_parents
= 1;
597 rx
->reg
= host
->regs
+ SD_EMMC_CLOCK
;
598 rx
->phase_mask
= CLK_RX_PHASE_MASK
;
599 rx
->delay_mask
= CLK_RX_DELAY_MASK
;
600 rx
->delay_step_ps
= CLK_DELAY_STEP_PS
;
603 host
->rx_clk
= devm_clk_register(host
->dev
, &rx
->hw
);
604 if (WARN_ON(PTR_ERR_OR_ZERO(host
->rx_clk
)))
605 return PTR_ERR(host
->rx_clk
);
607 /* init SD_EMMC_CLOCK to sane defaults w/min clock rate */
608 host
->mmc
->f_min
= clk_round_rate(host
->mmc_clk
, 400000);
609 ret
= clk_set_rate(host
->mmc_clk
, host
->mmc
->f_min
);
614 * Set phases : These values are mostly the datasheet recommended ones
615 * except for the Tx phase. Datasheet recommends 180 but some cards
616 * fail at initialisation with it. 270 works just fine, it fixes these
617 * initialisation issues and enable eMMC DDR52 mode.
619 clk_set_phase(host
->mmc_clk
, 180);
620 clk_set_phase(host
->tx_clk
, 270);
621 clk_set_phase(host
->rx_clk
, 0);
623 return clk_prepare_enable(host
->mmc_clk
);
626 static void meson_mmc_shift_map(unsigned long *map
, unsigned long shift
)
628 DECLARE_BITMAP(left
, CLK_PHASE_POINT_NUM
);
629 DECLARE_BITMAP(right
, CLK_PHASE_POINT_NUM
);
632 * shift the bitmap right and reintroduce the dropped bits on the left
635 bitmap_shift_right(right
, map
, shift
, CLK_PHASE_POINT_NUM
);
636 bitmap_shift_left(left
, map
, CLK_PHASE_POINT_NUM
- shift
,
637 CLK_PHASE_POINT_NUM
);
638 bitmap_or(map
, left
, right
, CLK_PHASE_POINT_NUM
);
641 static void meson_mmc_find_next_region(unsigned long *map
,
642 unsigned long *start
,
645 *start
= find_next_bit(map
, CLK_PHASE_POINT_NUM
, *start
);
646 *stop
= find_next_zero_bit(map
, CLK_PHASE_POINT_NUM
, *start
);
649 static int meson_mmc_find_tuning_point(unsigned long *test
)
651 unsigned long shift
, stop
, offset
= 0, start
= 0, size
= 0;
653 /* Get the all good/all bad situation out the way */
654 if (bitmap_full(test
, CLK_PHASE_POINT_NUM
))
655 return 0; /* All points are good so point 0 will do */
656 else if (bitmap_empty(test
, CLK_PHASE_POINT_NUM
))
657 return -EIO
; /* No successful tuning point */
660 * Now we know there is a least one region find. Make sure it does
661 * not wrap by the shifting the bitmap if necessary
663 shift
= find_first_zero_bit(test
, CLK_PHASE_POINT_NUM
);
665 meson_mmc_shift_map(test
, shift
);
667 while (start
< CLK_PHASE_POINT_NUM
) {
668 meson_mmc_find_next_region(test
, &start
, &stop
);
670 if ((stop
- start
) > size
) {
678 /* Get the center point of the region */
679 offset
+= (size
/ 2);
681 /* Shift the result back */
682 offset
= (offset
+ shift
) % CLK_PHASE_POINT_NUM
;
687 static int meson_mmc_clk_phase_tuning(struct mmc_host
*mmc
, u32 opcode
,
691 DECLARE_BITMAP(test
, CLK_PHASE_POINT_NUM
);
693 dev_dbg(mmc_dev(mmc
), "%s phase/delay tunning...\n",
694 __clk_get_name(clk
));
695 bitmap_zero(test
, CLK_PHASE_POINT_NUM
);
697 /* Explore tuning points */
698 for (point
= 0; point
< CLK_PHASE_POINT_NUM
; point
++) {
699 clk_set_phase(clk
, point
* CLK_PHASE_STEP
);
700 ret
= mmc_send_tuning(mmc
, opcode
, NULL
);
702 set_bit(point
, test
);
705 /* Find the optimal tuning point and apply it */
706 point
= meson_mmc_find_tuning_point(test
);
708 return point
; /* tuning failed */
710 clk_set_phase(clk
, point
* CLK_PHASE_STEP
);
711 dev_dbg(mmc_dev(mmc
), "success with phase: %d\n",
716 static int meson_mmc_execute_tuning(struct mmc_host
*mmc
, u32 opcode
)
718 struct meson_host
*host
= mmc_priv(mmc
);
720 return meson_mmc_clk_phase_tuning(mmc
, opcode
, host
->rx_clk
);
723 static void meson_mmc_set_ios(struct mmc_host
*mmc
, struct mmc_ios
*ios
)
725 struct meson_host
*host
= mmc_priv(mmc
);
730 * GPIO regulator, only controls switching between 1v8 and
731 * 3v3, doesn't support MMC_POWER_OFF, MMC_POWER_ON.
733 switch (ios
->power_mode
) {
735 if (!IS_ERR(mmc
->supply
.vmmc
))
736 mmc_regulator_set_ocr(mmc
, mmc
->supply
.vmmc
, 0);
738 if (!IS_ERR(mmc
->supply
.vqmmc
) && host
->vqmmc_enabled
) {
739 regulator_disable(mmc
->supply
.vqmmc
);
740 host
->vqmmc_enabled
= false;
746 if (!IS_ERR(mmc
->supply
.vmmc
))
747 mmc_regulator_set_ocr(mmc
, mmc
->supply
.vmmc
, ios
->vdd
);
750 clk_set_phase(host
->rx_clk
, 0);
755 if (!IS_ERR(mmc
->supply
.vqmmc
) && !host
->vqmmc_enabled
) {
756 int ret
= regulator_enable(mmc
->supply
.vqmmc
);
760 "failed to enable vqmmc regulator\n");
762 host
->vqmmc_enabled
= true;
769 switch (ios
->bus_width
) {
770 case MMC_BUS_WIDTH_1
:
771 bus_width
= CFG_BUS_WIDTH_1
;
773 case MMC_BUS_WIDTH_4
:
774 bus_width
= CFG_BUS_WIDTH_4
;
776 case MMC_BUS_WIDTH_8
:
777 bus_width
= CFG_BUS_WIDTH_8
;
780 dev_err(host
->dev
, "Invalid ios->bus_width: %u. Setting to 4.\n",
782 bus_width
= CFG_BUS_WIDTH_4
;
785 val
= readl(host
->regs
+ SD_EMMC_CFG
);
786 val
&= ~CFG_BUS_WIDTH_MASK
;
787 val
|= FIELD_PREP(CFG_BUS_WIDTH_MASK
, bus_width
);
790 if (meson_mmc_timing_is_ddr(ios
))
794 if (ios
->timing
== MMC_TIMING_MMC_HS400
)
797 err
= meson_mmc_clk_set(host
, ios
);
799 dev_err(host
->dev
, "Failed to set clock: %d\n,", err
);
801 writel(val
, host
->regs
+ SD_EMMC_CFG
);
802 dev_dbg(host
->dev
, "SD_EMMC_CFG: 0x%08x\n", val
);
805 static void meson_mmc_request_done(struct mmc_host
*mmc
,
806 struct mmc_request
*mrq
)
808 struct meson_host
*host
= mmc_priv(mmc
);
811 mmc_request_done(host
->mmc
, mrq
);
814 static void meson_mmc_set_blksz(struct mmc_host
*mmc
, unsigned int blksz
)
816 struct meson_host
*host
= mmc_priv(mmc
);
819 cfg
= readl(host
->regs
+ SD_EMMC_CFG
);
820 blksz_old
= FIELD_GET(CFG_BLK_LEN_MASK
, cfg
);
822 if (!is_power_of_2(blksz
))
823 dev_err(host
->dev
, "blksz %u is not a power of 2\n", blksz
);
825 blksz
= ilog2(blksz
);
827 /* check if block-size matches, if not update */
828 if (blksz
== blksz_old
)
831 dev_dbg(host
->dev
, "%s: update blk_len %d -> %d\n", __func__
,
834 cfg
&= ~CFG_BLK_LEN_MASK
;
835 cfg
|= FIELD_PREP(CFG_BLK_LEN_MASK
, blksz
);
836 writel(cfg
, host
->regs
+ SD_EMMC_CFG
);
839 static void meson_mmc_set_response_bits(struct mmc_command
*cmd
, u32
*cmd_cfg
)
841 if (cmd
->flags
& MMC_RSP_PRESENT
) {
842 if (cmd
->flags
& MMC_RSP_136
)
843 *cmd_cfg
|= CMD_CFG_RESP_128
;
844 *cmd_cfg
|= CMD_CFG_RESP_NUM
;
846 if (!(cmd
->flags
& MMC_RSP_CRC
))
847 *cmd_cfg
|= CMD_CFG_RESP_NOCRC
;
849 if (cmd
->flags
& MMC_RSP_BUSY
)
850 *cmd_cfg
|= CMD_CFG_R1B
;
852 *cmd_cfg
|= CMD_CFG_NO_RESP
;
856 static void meson_mmc_desc_chain_transfer(struct mmc_host
*mmc
, u32 cmd_cfg
)
858 struct meson_host
*host
= mmc_priv(mmc
);
859 struct sd_emmc_desc
*desc
= host
->descs
;
860 struct mmc_data
*data
= host
->cmd
->data
;
861 struct scatterlist
*sg
;
865 if (data
->flags
& MMC_DATA_WRITE
)
866 cmd_cfg
|= CMD_CFG_DATA_WR
;
868 if (data
->blocks
> 1) {
869 cmd_cfg
|= CMD_CFG_BLOCK_MODE
;
870 meson_mmc_set_blksz(mmc
, data
->blksz
);
873 for_each_sg(data
->sg
, sg
, data
->sg_count
, i
) {
874 unsigned int len
= sg_dma_len(sg
);
876 if (data
->blocks
> 1)
879 desc
[i
].cmd_cfg
= cmd_cfg
;
880 desc
[i
].cmd_cfg
|= FIELD_PREP(CMD_CFG_LENGTH_MASK
, len
);
882 desc
[i
].cmd_cfg
|= CMD_CFG_NO_CMD
;
883 desc
[i
].cmd_arg
= host
->cmd
->arg
;
884 desc
[i
].cmd_resp
= 0;
885 desc
[i
].cmd_data
= sg_dma_address(sg
);
887 desc
[data
->sg_count
- 1].cmd_cfg
|= CMD_CFG_END_OF_CHAIN
;
889 dma_wmb(); /* ensure descriptor is written before kicked */
890 start
= host
->descs_dma_addr
| START_DESC_BUSY
;
891 writel(start
, host
->regs
+ SD_EMMC_START
);
894 static void meson_mmc_start_cmd(struct mmc_host
*mmc
, struct mmc_command
*cmd
)
896 struct meson_host
*host
= mmc_priv(mmc
);
897 struct mmc_data
*data
= cmd
->data
;
898 u32 cmd_cfg
= 0, cmd_data
= 0;
899 unsigned int xfer_bytes
= 0;
901 /* Setup descriptors */
906 cmd_cfg
|= FIELD_PREP(CMD_CFG_CMD_INDEX_MASK
, cmd
->opcode
);
907 cmd_cfg
|= CMD_CFG_OWNER
; /* owned by CPU */
909 meson_mmc_set_response_bits(cmd
, &cmd_cfg
);
913 data
->bytes_xfered
= 0;
914 cmd_cfg
|= CMD_CFG_DATA_IO
;
915 cmd_cfg
|= FIELD_PREP(CMD_CFG_TIMEOUT_MASK
,
916 ilog2(meson_mmc_get_timeout_msecs(data
)));
918 if (meson_mmc_desc_chain_mode(data
)) {
919 meson_mmc_desc_chain_transfer(mmc
, cmd_cfg
);
923 if (data
->blocks
> 1) {
924 cmd_cfg
|= CMD_CFG_BLOCK_MODE
;
925 cmd_cfg
|= FIELD_PREP(CMD_CFG_LENGTH_MASK
,
927 meson_mmc_set_blksz(mmc
, data
->blksz
);
929 cmd_cfg
|= FIELD_PREP(CMD_CFG_LENGTH_MASK
, data
->blksz
);
932 xfer_bytes
= data
->blksz
* data
->blocks
;
933 if (data
->flags
& MMC_DATA_WRITE
) {
934 cmd_cfg
|= CMD_CFG_DATA_WR
;
935 WARN_ON(xfer_bytes
> host
->bounce_buf_size
);
936 sg_copy_to_buffer(data
->sg
, data
->sg_len
,
937 host
->bounce_buf
, xfer_bytes
);
941 cmd_data
= host
->bounce_dma_addr
& CMD_DATA_MASK
;
943 cmd_cfg
|= FIELD_PREP(CMD_CFG_TIMEOUT_MASK
,
944 ilog2(SD_EMMC_CMD_TIMEOUT
));
947 /* Last descriptor */
948 cmd_cfg
|= CMD_CFG_END_OF_CHAIN
;
949 writel(cmd_cfg
, host
->regs
+ SD_EMMC_CMD_CFG
);
950 writel(cmd_data
, host
->regs
+ SD_EMMC_CMD_DAT
);
951 writel(0, host
->regs
+ SD_EMMC_CMD_RSP
);
952 wmb(); /* ensure descriptor is written before kicked */
953 writel(cmd
->arg
, host
->regs
+ SD_EMMC_CMD_ARG
);
956 static void meson_mmc_request(struct mmc_host
*mmc
, struct mmc_request
*mrq
)
958 struct meson_host
*host
= mmc_priv(mmc
);
959 bool needs_pre_post_req
= mrq
->data
&&
960 !(mrq
->data
->host_cookie
& SD_EMMC_PRE_REQ_DONE
);
962 if (needs_pre_post_req
) {
963 meson_mmc_get_transfer_mode(mmc
, mrq
);
964 if (!meson_mmc_desc_chain_mode(mrq
->data
))
965 needs_pre_post_req
= false;
968 if (needs_pre_post_req
)
969 meson_mmc_pre_req(mmc
, mrq
);
972 writel(0, host
->regs
+ SD_EMMC_START
);
974 meson_mmc_start_cmd(mmc
, mrq
->sbc
?: mrq
->cmd
);
976 if (needs_pre_post_req
)
977 meson_mmc_post_req(mmc
, mrq
, 0);
980 static void meson_mmc_read_resp(struct mmc_host
*mmc
, struct mmc_command
*cmd
)
982 struct meson_host
*host
= mmc_priv(mmc
);
984 if (cmd
->flags
& MMC_RSP_136
) {
985 cmd
->resp
[0] = readl(host
->regs
+ SD_EMMC_CMD_RSP3
);
986 cmd
->resp
[1] = readl(host
->regs
+ SD_EMMC_CMD_RSP2
);
987 cmd
->resp
[2] = readl(host
->regs
+ SD_EMMC_CMD_RSP1
);
988 cmd
->resp
[3] = readl(host
->regs
+ SD_EMMC_CMD_RSP
);
989 } else if (cmd
->flags
& MMC_RSP_PRESENT
) {
990 cmd
->resp
[0] = readl(host
->regs
+ SD_EMMC_CMD_RSP
);
994 static irqreturn_t
meson_mmc_irq(int irq
, void *dev_id
)
996 struct meson_host
*host
= dev_id
;
997 struct mmc_command
*cmd
;
998 struct mmc_data
*data
;
999 u32 irq_en
, status
, raw_status
;
1000 irqreturn_t ret
= IRQ_NONE
;
1002 if (WARN_ON(!host
) || WARN_ON(!host
->cmd
))
1005 spin_lock(&host
->lock
);
1009 irq_en
= readl(host
->regs
+ SD_EMMC_IRQ_EN
);
1010 raw_status
= readl(host
->regs
+ SD_EMMC_STATUS
);
1011 status
= raw_status
& irq_en
;
1014 if (status
& IRQ_CRC_ERR
) {
1015 dev_dbg(host
->dev
, "CRC Error - status 0x%08x\n", status
);
1016 cmd
->error
= -EILSEQ
;
1021 if (status
& IRQ_TIMEOUTS
) {
1022 dev_dbg(host
->dev
, "Timeout - status 0x%08x\n", status
);
1023 cmd
->error
= -ETIMEDOUT
;
1028 meson_mmc_read_resp(host
->mmc
, cmd
);
1030 if (status
& IRQ_SDIO
) {
1031 dev_dbg(host
->dev
, "IRQ: SDIO TODO.\n");
1035 if (status
& (IRQ_END_OF_CHAIN
| IRQ_RESP_STATUS
)) {
1036 if (data
&& !cmd
->error
)
1037 data
->bytes_xfered
= data
->blksz
* data
->blocks
;
1038 if (meson_mmc_bounce_buf_read(data
) ||
1039 meson_mmc_get_next_command(cmd
))
1040 ret
= IRQ_WAKE_THREAD
;
1046 /* ack all enabled interrupts */
1047 writel(irq_en
, host
->regs
+ SD_EMMC_STATUS
);
1049 if (ret
== IRQ_HANDLED
)
1050 meson_mmc_request_done(host
->mmc
, cmd
->mrq
);
1051 else if (ret
== IRQ_NONE
)
1053 "Unexpected IRQ! status=0x%08x, irq_en=0x%08x\n",
1054 raw_status
, irq_en
);
1056 spin_unlock(&host
->lock
);
1060 static irqreturn_t
meson_mmc_irq_thread(int irq
, void *dev_id
)
1062 struct meson_host
*host
= dev_id
;
1063 struct mmc_command
*next_cmd
, *cmd
= host
->cmd
;
1064 struct mmc_data
*data
;
1065 unsigned int xfer_bytes
;
1071 if (meson_mmc_bounce_buf_read(data
)) {
1072 xfer_bytes
= data
->blksz
* data
->blocks
;
1073 WARN_ON(xfer_bytes
> host
->bounce_buf_size
);
1074 sg_copy_from_buffer(data
->sg
, data
->sg_len
,
1075 host
->bounce_buf
, xfer_bytes
);
1078 next_cmd
= meson_mmc_get_next_command(cmd
);
1080 meson_mmc_start_cmd(host
->mmc
, next_cmd
);
1082 meson_mmc_request_done(host
->mmc
, cmd
->mrq
);
1088 * NOTE: we only need this until the GPIO/pinctrl driver can handle
1089 * interrupts. For now, the MMC core will use this for polling.
1091 static int meson_mmc_get_cd(struct mmc_host
*mmc
)
1093 int status
= mmc_gpio_get_cd(mmc
);
1095 if (status
== -ENOSYS
)
1096 return 1; /* assume present */
1101 static void meson_mmc_cfg_init(struct meson_host
*host
)
1105 cfg
|= FIELD_PREP(CFG_RESP_TIMEOUT_MASK
,
1106 ilog2(SD_EMMC_CFG_RESP_TIMEOUT
));
1107 cfg
|= FIELD_PREP(CFG_RC_CC_MASK
, ilog2(SD_EMMC_CFG_CMD_GAP
));
1108 cfg
|= FIELD_PREP(CFG_BLK_LEN_MASK
, ilog2(SD_EMMC_CFG_BLK_SIZE
));
1110 writel(cfg
, host
->regs
+ SD_EMMC_CFG
);
1113 static int meson_mmc_card_busy(struct mmc_host
*mmc
)
1115 struct meson_host
*host
= mmc_priv(mmc
);
1118 regval
= readl(host
->regs
+ SD_EMMC_STATUS
);
1120 /* We are only interrested in lines 0 to 3, so mask the other ones */
1121 return !(FIELD_GET(STATUS_DATI
, regval
) & 0xf);
1124 static int meson_mmc_voltage_switch(struct mmc_host
*mmc
, struct mmc_ios
*ios
)
1126 /* vqmmc regulator is available */
1127 if (!IS_ERR(mmc
->supply
.vqmmc
)) {
1129 * The usual amlogic setup uses a GPIO to switch from one
1130 * regulator to the other. While the voltage ramp up is
1131 * pretty fast, care must be taken when switching from 3.3v
1132 * to 1.8v. Please make sure the regulator framework is aware
1133 * of your own regulator constraints
1135 return mmc_regulator_set_vqmmc(mmc
, ios
);
1138 /* no vqmmc regulator, assume fixed regulator at 3/3.3V */
1139 if (ios
->signal_voltage
== MMC_SIGNAL_VOLTAGE_330
)
1145 static const struct mmc_host_ops meson_mmc_ops
= {
1146 .request
= meson_mmc_request
,
1147 .set_ios
= meson_mmc_set_ios
,
1148 .get_cd
= meson_mmc_get_cd
,
1149 .pre_req
= meson_mmc_pre_req
,
1150 .post_req
= meson_mmc_post_req
,
1151 .execute_tuning
= meson_mmc_execute_tuning
,
1152 .card_busy
= meson_mmc_card_busy
,
1153 .start_signal_voltage_switch
= meson_mmc_voltage_switch
,
1156 static int meson_mmc_probe(struct platform_device
*pdev
)
1158 struct resource
*res
;
1159 struct meson_host
*host
;
1160 struct mmc_host
*mmc
;
1163 mmc
= mmc_alloc_host(sizeof(struct meson_host
), &pdev
->dev
);
1166 host
= mmc_priv(mmc
);
1168 host
->dev
= &pdev
->dev
;
1169 dev_set_drvdata(&pdev
->dev
, host
);
1171 spin_lock_init(&host
->lock
);
1173 /* Get regulators and the supported OCR mask */
1174 host
->vqmmc_enabled
= false;
1175 ret
= mmc_regulator_get_supply(mmc
);
1179 ret
= mmc_of_parse(mmc
);
1181 if (ret
!= -EPROBE_DEFER
)
1182 dev_warn(&pdev
->dev
, "error parsing DT: %d\n", ret
);
1186 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
1187 host
->regs
= devm_ioremap_resource(&pdev
->dev
, res
);
1188 if (IS_ERR(host
->regs
)) {
1189 ret
= PTR_ERR(host
->regs
);
1193 irq
= platform_get_irq(pdev
, 0);
1195 dev_err(&pdev
->dev
, "failed to get interrupt resource.\n");
1200 host
->pinctrl
= devm_pinctrl_get(&pdev
->dev
);
1201 if (IS_ERR(host
->pinctrl
)) {
1202 ret
= PTR_ERR(host
->pinctrl
);
1206 host
->pins_default
= pinctrl_lookup_state(host
->pinctrl
,
1207 PINCTRL_STATE_DEFAULT
);
1208 if (IS_ERR(host
->pins_default
)) {
1209 ret
= PTR_ERR(host
->pins_default
);
1213 host
->pins_clk_gate
= pinctrl_lookup_state(host
->pinctrl
,
1215 if (IS_ERR(host
->pins_clk_gate
)) {
1216 dev_warn(&pdev
->dev
,
1217 "can't get clk-gate pinctrl, using clk_stop bit\n");
1218 host
->pins_clk_gate
= NULL
;
1221 host
->core_clk
= devm_clk_get(&pdev
->dev
, "core");
1222 if (IS_ERR(host
->core_clk
)) {
1223 ret
= PTR_ERR(host
->core_clk
);
1227 ret
= clk_prepare_enable(host
->core_clk
);
1231 ret
= meson_mmc_clk_init(host
);
1235 /* set config to sane default */
1236 meson_mmc_cfg_init(host
);
1238 /* Stop execution */
1239 writel(0, host
->regs
+ SD_EMMC_START
);
1241 /* clear, ack and enable interrupts */
1242 writel(0, host
->regs
+ SD_EMMC_IRQ_EN
);
1243 writel(IRQ_CRC_ERR
| IRQ_TIMEOUTS
| IRQ_END_OF_CHAIN
,
1244 host
->regs
+ SD_EMMC_STATUS
);
1245 writel(IRQ_CRC_ERR
| IRQ_TIMEOUTS
| IRQ_END_OF_CHAIN
,
1246 host
->regs
+ SD_EMMC_IRQ_EN
);
1248 ret
= devm_request_threaded_irq(&pdev
->dev
, irq
, meson_mmc_irq
,
1249 meson_mmc_irq_thread
, IRQF_SHARED
,
1254 mmc
->caps
|= MMC_CAP_CMD23
;
1255 mmc
->max_blk_count
= CMD_CFG_LENGTH_MASK
;
1256 mmc
->max_req_size
= mmc
->max_blk_count
* mmc
->max_blk_size
;
1257 mmc
->max_segs
= SD_EMMC_DESC_BUF_LEN
/ sizeof(struct sd_emmc_desc
);
1258 mmc
->max_seg_size
= mmc
->max_req_size
;
1260 /* data bounce buffer */
1261 host
->bounce_buf_size
= mmc
->max_req_size
;
1263 dma_alloc_coherent(host
->dev
, host
->bounce_buf_size
,
1264 &host
->bounce_dma_addr
, GFP_KERNEL
);
1265 if (host
->bounce_buf
== NULL
) {
1266 dev_err(host
->dev
, "Unable to map allocate DMA bounce buffer.\n");
1271 host
->descs
= dma_alloc_coherent(host
->dev
, SD_EMMC_DESC_BUF_LEN
,
1272 &host
->descs_dma_addr
, GFP_KERNEL
);
1274 dev_err(host
->dev
, "Allocating descriptor DMA buffer failed\n");
1276 goto err_bounce_buf
;
1279 mmc
->ops
= &meson_mmc_ops
;
1285 dma_free_coherent(host
->dev
, host
->bounce_buf_size
,
1286 host
->bounce_buf
, host
->bounce_dma_addr
);
1288 clk_disable_unprepare(host
->mmc_clk
);
1290 clk_disable_unprepare(host
->core_clk
);
1296 static int meson_mmc_remove(struct platform_device
*pdev
)
1298 struct meson_host
*host
= dev_get_drvdata(&pdev
->dev
);
1300 mmc_remove_host(host
->mmc
);
1302 /* disable interrupts */
1303 writel(0, host
->regs
+ SD_EMMC_IRQ_EN
);
1305 dma_free_coherent(host
->dev
, SD_EMMC_DESC_BUF_LEN
,
1306 host
->descs
, host
->descs_dma_addr
);
1307 dma_free_coherent(host
->dev
, host
->bounce_buf_size
,
1308 host
->bounce_buf
, host
->bounce_dma_addr
);
1310 clk_disable_unprepare(host
->mmc_clk
);
1311 clk_disable_unprepare(host
->core_clk
);
1313 mmc_free_host(host
->mmc
);
1317 static const struct of_device_id meson_mmc_of_match
[] = {
1318 { .compatible
= "amlogic,meson-gx-mmc", },
1319 { .compatible
= "amlogic,meson-gxbb-mmc", },
1320 { .compatible
= "amlogic,meson-gxl-mmc", },
1321 { .compatible
= "amlogic,meson-gxm-mmc", },
1324 MODULE_DEVICE_TABLE(of
, meson_mmc_of_match
);
1326 static struct platform_driver meson_mmc_driver
= {
1327 .probe
= meson_mmc_probe
,
1328 .remove
= meson_mmc_remove
,
1330 .name
= DRIVER_NAME
,
1331 .of_match_table
= of_match_ptr(meson_mmc_of_match
),
1335 module_platform_driver(meson_mmc_driver
);
1337 MODULE_DESCRIPTION("Amlogic S905*/GX* SD/eMMC driver");
1338 MODULE_AUTHOR("Kevin Hilman <khilman@baylibre.com>");
1339 MODULE_LICENSE("GPL v2");