summaryrefslogtreecommitdiff
path: root/drivers/mmc/host/sdhci_am654.c
blob: a91c0b45c48d121816467ee51ea708882c7d831d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
// SPDX-License-Identifier: GPL-2.0
/*
 * sdhci_am654.c - SDHCI driver for TI's AM654 SOCs
 *
 * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com
 *
 */
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/regmap.h>

#include "sdhci-pltfm.h"

/* CTL_CFG Registers */
#define CTL_CFG_2		0x14

#define SLOTTYPE_MASK		GENMASK(31, 30)
#define SLOTTYPE_EMBEDDED	BIT(30)

/* PHY Registers */
#define PHY_CTRL1	0x100
#define PHY_CTRL2	0x104
#define PHY_CTRL3	0x108
#define PHY_CTRL4	0x10C
#define PHY_CTRL5	0x110
#define PHY_CTRL6	0x114
#define PHY_STAT1	0x130
#define PHY_STAT2	0x134

#define IOMUX_ENABLE_SHIFT	31
#define IOMUX_ENABLE_MASK	BIT(IOMUX_ENABLE_SHIFT)
#define OTAPDLYENA_SHIFT	20
#define OTAPDLYENA_MASK		BIT(OTAPDLYENA_SHIFT)
#define OTAPDLYSEL_SHIFT	12
#define OTAPDLYSEL_MASK		GENMASK(15, 12)
#define STRBSEL_SHIFT		24
#define STRBSEL_MASK		GENMASK(27, 24)
#define SEL50_SHIFT		8
#define SEL50_MASK		BIT(SEL50_SHIFT)
#define SEL100_SHIFT		9
#define SEL100_MASK		BIT(SEL100_SHIFT)
#define DLL_TRIM_ICP_SHIFT	4
#define DLL_TRIM_ICP_MASK	GENMASK(7, 4)
#define DR_TY_SHIFT		20
#define DR_TY_MASK		GENMASK(22, 20)
#define ENDLL_SHIFT		1
#define ENDLL_MASK		BIT(ENDLL_SHIFT)
#define DLLRDY_SHIFT		0
#define DLLRDY_MASK		BIT(DLLRDY_SHIFT)
#define PDB_SHIFT		0
#define PDB_MASK		BIT(PDB_SHIFT)
#define CALDONE_SHIFT		1
#define CALDONE_MASK		BIT(CALDONE_SHIFT)
#define RETRIM_SHIFT		17
#define RETRIM_MASK		BIT(RETRIM_SHIFT)

#define DRIVER_STRENGTH_50_OHM	0x0
#define DRIVER_STRENGTH_33_OHM	0x1
#define DRIVER_STRENGTH_66_OHM	0x2
#define DRIVER_STRENGTH_100_OHM	0x3
#define DRIVER_STRENGTH_40_OHM	0x4

#define CLOCK_TOO_SLOW_HZ	400000

static struct regmap_config sdhci_am654_regmap_config = {
	.reg_bits = 32,
	.val_bits = 32,
	.reg_stride = 4,
	.fast_io = true,
};

struct sdhci_am654_data {
	struct regmap *base;
	int otap_del_sel;
	int trm_icp;
	int drv_strength;
	bool dll_on;
};

static void sdhci_am654_set_clock(struct sdhci_host *host, unsigned int clock)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
	int sel50, sel100;
	u32 mask, val;
	int ret;

	if (sdhci_am654->dll_on) {
		regmap_update_bits(sdhci_am654->base, PHY_CTRL1,
				   ENDLL_MASK, 0);

		sdhci_am654->dll_on = false;
	}

	sdhci_set_clock(host, clock);

	if (clock > CLOCK_TOO_SLOW_HZ) {
		/* Setup DLL Output TAP delay */
		mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
		val = (1 << OTAPDLYENA_SHIFT) |
		      (sdhci_am654->otap_del_sel << OTAPDLYSEL_SHIFT);
		regmap_update_bits(sdhci_am654->base, PHY_CTRL4,
				   mask, val);
		switch (clock) {
		case 200000000:
			sel50 = 0;
			sel100 = 0;
			break;
		case 100000000:
			sel50 = 0;
			sel100 = 1;
			break;
		default:
			sel50 = 1;
			sel100 = 0;
		}

		/* Configure PHY DLL frequency */
		mask = SEL50_MASK | SEL100_MASK;
		val = (sel50 << SEL50_SHIFT) | (sel100 << SEL100_SHIFT);
		regmap_update_bits(sdhci_am654->base, PHY_CTRL5,
				   mask, val);
		/* Configure DLL TRIM */
		mask = DLL_TRIM_ICP_MASK;
		val = sdhci_am654->trm_icp << DLL_TRIM_ICP_SHIFT;

		/* Configure DLL driver strength */
		mask |= DR_TY_MASK;
		val |= sdhci_am654->drv_strength << DR_TY_SHIFT;
		regmap_update_bits(sdhci_am654->base, PHY_CTRL1,
				   mask, val);
		/* Enable DLL */
		regmap_update_bits(sdhci_am654->base, PHY_CTRL1,
				   ENDLL_MASK, 0x1 << ENDLL_SHIFT);
		/*
		 * Poll for DLL ready. Use a one second timeout.
		 * Works in all experiments done so far
		 */
		ret = regmap_read_poll_timeout(sdhci_am654->base,
					 PHY_STAT1, val,
					 val & DLLRDY_MASK,
					 1000, 1000000);

		sdhci_am654->dll_on = true;
	}
}

static void sdhci_am654_set_power(struct sdhci_host *host, unsigned char mode,
				  unsigned short vdd)
{
	if (!IS_ERR(host->mmc->supply.vmmc)) {
		struct mmc_host *mmc = host->mmc;

		mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
	}
	sdhci_set_power_noreg(host, mode, vdd);
}

static void sdhci_am654_write_b(struct sdhci_host *host, u8 val, int reg)
{
	unsigned char timing = host->mmc->ios.timing;

	if (reg == SDHCI_HOST_CONTROL) {
		switch (timing) {
		/*
		 * According to the data manual, HISPD bit
		 * should not be set in these speed modes.
		 */
		case MMC_TIMING_SD_HS:
		case MMC_TIMING_MMC_HS:
		case MMC_TIMING_UHS_SDR12:
		case MMC_TIMING_UHS_SDR25:
			val &= ~SDHCI_CTRL_HISPD;
		}
	}

	writeb(val, host->ioaddr + reg);
}

static struct sdhci_ops sdhci_am654_ops = {
	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
	.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
	.set_uhs_signaling = sdhci_set_uhs_signaling,
	.set_bus_width = sdhci_set_bus_width,
	.set_power = sdhci_am654_set_power,
	.set_clock = sdhci_am654_set_clock,
	.write_b = sdhci_am654_write_b,
	.reset = sdhci_reset,
};

static const struct sdhci_pltfm_data sdhci_am654_pdata = {
	.ops = &sdhci_am654_ops,
	.quirks = SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
		  SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12,
	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
};

static int sdhci_am654_init(struct sdhci_host *host)
{
	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
	struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
	u32 ctl_cfg_2 = 0;
	u32 mask;
	u32 val;
	int ret;

	/* Reset OTAP to default value */
	mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
	regmap_update_bits(sdhci_am654->base, PHY_CTRL4,
				   mask, 0x0);

	regmap_read(sdhci_am654->base, PHY_STAT1, &val);
	if (~val & CALDONE_MASK) {
		/* Calibrate IO lines */
		regmap_update_bits(sdhci_am654->base, PHY_CTRL1,
				   PDB_MASK, PDB_MASK);
		ret = regmap_read_poll_timeout(sdhci_am654->base, PHY_STAT1,
					       val, val & CALDONE_MASK, 1, 20);
		if (ret)
			return ret;
	}

	/* Enable pins by setting IO mux to 0 */
	regmap_update_bits(sdhci_am654->base, PHY_CTRL1,
			   IOMUX_ENABLE_MASK, 0);

	/* Set slot type based on SD or eMMC */
	if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
		ctl_cfg_2 = SLOTTYPE_EMBEDDED;

	regmap_update_bits(sdhci_am654->base, CTL_CFG_2,
			   ctl_cfg_2, SLOTTYPE_MASK);

	return sdhci_add_host(host);
}

static int sdhci_am654_get_of_property(struct platform_device *pdev,
					struct sdhci_am654_data *sdhci_am654)
{
	struct device *dev = &pdev->dev;
	int drv_strength;
	int ret;

	ret = device_property_read_u32(dev, "ti,trm-icp",
				       &sdhci_am654->trm_icp);
	if (ret)
		return ret;

	ret = device_property_read_u32(dev, "ti,otap-del-sel",
				       &sdhci_am654->otap_del_sel);
	if (ret)
		return ret;

	ret = device_property_read_u32(dev, "ti,driver-strength-ohm",
				       &drv_strength);
	if (ret)
		return ret;

	switch (drv_strength) {
	case 50:
		sdhci_am654->drv_strength = DRIVER_STRENGTH_50_OHM;
		break;
	case 33:
		sdhci_am654->drv_strength = DRIVER_STRENGTH_33_OHM;
		break;
	case 66:
		sdhci_am654->drv_strength = DRIVER_STRENGTH_66_OHM;
		break;
	case 100:
		sdhci_am654->drv_strength = DRIVER_STRENGTH_100_OHM;
		break;
	case 40:
		sdhci_am654->drv_strength = DRIVER_STRENGTH_40_OHM;
		break;
	default:
		dev_err(dev, "Invalid driver strength\n");
		return -EINVAL;
	}

	sdhci_get_of_property(pdev);

	return 0;
}

static int sdhci_am654_probe(struct platform_device *pdev)
{
	struct sdhci_pltfm_host *pltfm_host;
	struct sdhci_am654_data *sdhci_am654;
	struct sdhci_host *host;
	struct resource *res;
	struct clk *clk_xin;
	struct device *dev = &pdev->dev;
	void __iomem *base;
	int ret;

	host = sdhci_pltfm_init(pdev, &sdhci_am654_pdata, sizeof(*sdhci_am654));
	if (IS_ERR(host))
		return PTR_ERR(host);

	pltfm_host = sdhci_priv(host);
	sdhci_am654 = sdhci_pltfm_priv(pltfm_host);

	clk_xin = devm_clk_get(dev, "clk_xin");
	if (IS_ERR(clk_xin)) {
		dev_err(dev, "clk_xin clock not found.\n");
		ret = PTR_ERR(clk_xin);
		goto err_pltfm_free;
	}

	pltfm_host->clk = clk_xin;

	/* Clocks are enabled using pm_runtime */
	pm_runtime_enable(dev);
	ret = pm_runtime_get_sync(dev);
	if (ret < 0) {
		pm_runtime_put_noidle(dev);
		goto pm_runtime_disable;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	base = devm_ioremap_resource(dev, res);
	if (IS_ERR(base)) {
		ret = PTR_ERR(base);
		goto pm_runtime_put;
	}

	sdhci_am654->base = devm_regmap_init_mmio(dev, base,
						  &sdhci_am654_regmap_config);
	if (IS_ERR(sdhci_am654->base)) {
		dev_err(dev, "Failed to initialize regmap\n");
		ret = PTR_ERR(sdhci_am654->base);
		goto pm_runtime_put;
	}

	ret = sdhci_am654_get_of_property(pdev, sdhci_am654);
	if (ret)
		goto pm_runtime_put;

	ret = mmc_of_parse(host->mmc);
	if (ret) {
		dev_err(dev, "parsing dt failed (%d)\n", ret);
		goto pm_runtime_put;
	}

	ret = sdhci_am654_init(host);
	if (ret)
		goto pm_runtime_put;

	return 0;

pm_runtime_put:
	pm_runtime_put_sync(dev);
pm_runtime_disable:
	pm_runtime_disable(dev);
err_pltfm_free:
	sdhci_pltfm_free(pdev);
	return ret;
}

static int sdhci_am654_remove(struct platform_device *pdev)
{
	struct sdhci_host *host = platform_get_drvdata(pdev);
	int ret;

	sdhci_remove_host(host, true);
	ret = pm_runtime_put_sync(&pdev->dev);
	if (ret < 0)
		return ret;

	pm_runtime_disable(&pdev->dev);
	sdhci_pltfm_free(pdev);

	return 0;
}

static const struct of_device_id sdhci_am654_of_match[] = {
	{ .compatible = "ti,am654-sdhci-5.1" },
	{ /* sentinel */ }
};

static struct platform_driver sdhci_am654_driver = {
	.driver = {
		.name = "sdhci-am654",
		.of_match_table = sdhci_am654_of_match,
	},
	.probe = sdhci_am654_probe,
	.remove = sdhci_am654_remove,
};

module_platform_driver(sdhci_am654_driver);

MODULE_DESCRIPTION("Driver for SDHCI Controller on TI's AM654 devices");
MODULE_AUTHOR("Faiz Abbas <faiz_abbas@ti.com>");
MODULE_LICENSE("GPL");