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2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f 
 kernel/drivers/mmc/host/sdhci-brcmstb.c
....@@ -1,57 +1,297 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * sdhci-brcmstb.c Support for SDHCI on Broadcom BRCMSTB SoC's
34  *
45  * Copyright (C) 2015 Broadcom Corporation
5
- *
6
- * This program is free software; you can redistribute it and/or modify
7
- * it under the terms of the GNU General Public License version 2 as
8
- * published by the Free Software Foundation.
9
- *
10
- * This program is distributed in the hope that it will be useful,
11
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13
- * GNU General Public License for more details.
14
- *
156  */
167 
178 #include <linux/io.h>
189 #include <linux/mmc/host.h>
1910 #include <linux/module.h>
2011 #include <linux/of.h>
12
+#include <linux/bitops.h>
13
+#include <linux/delay.h>
2114 
15
+#include "sdhci-cqhci.h"
2216 #include "sdhci-pltfm.h"
17
+#include "cqhci.h"
2318 
24
-static const struct sdhci_ops sdhci_brcmstb_ops = {
19
+#define SDHCI_VENDOR 0x78
20
+#define  SDHCI_VENDOR_ENHANCED_STRB 0x1
21
+#define  SDHCI_VENDOR_GATE_SDCLK_EN 0x2
22
+
23
+#define BRCMSTB_MATCH_FLAGS_NO_64BIT		BIT(0)
24
+#define BRCMSTB_MATCH_FLAGS_BROKEN_TIMEOUT	BIT(1)
25
+#define BRCMSTB_MATCH_FLAGS_HAS_CLOCK_GATE	BIT(2)
26
+
27
+#define BRCMSTB_PRIV_FLAGS_HAS_CQE		BIT(0)
28
+#define BRCMSTB_PRIV_FLAGS_GATE_CLOCK		BIT(1)
29
+
30
+#define SDHCI_ARASAN_CQE_BASE_ADDR		0x200
31
+
32
+struct sdhci_brcmstb_priv {
33
+	void __iomem *cfg_regs;
34
+	unsigned int flags;
35
+};
36
+
37
+struct brcmstb_match_priv {
38
+	void (*hs400es)(struct mmc_host *mmc, struct mmc_ios *ios);
39
+	struct sdhci_ops *ops;
40
+	const unsigned int flags;
41
+};
42
+
43
+static inline void enable_clock_gating(struct sdhci_host *host)
44
+{
45
+	u32 reg;
46
+
47
+	reg = sdhci_readl(host, SDHCI_VENDOR);
48
+	reg |= SDHCI_VENDOR_GATE_SDCLK_EN;
49
+	sdhci_writel(host, reg, SDHCI_VENDOR);
50
+}
51
+
52
+void brcmstb_reset(struct sdhci_host *host, u8 mask)
53
+{
54
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
55
+	struct sdhci_brcmstb_priv *priv = sdhci_pltfm_priv(pltfm_host);
56
+
57
+	sdhci_and_cqhci_reset(host, mask);
58
+
59
+	/* Reset will clear this, so re-enable it */
60
+	if (priv->flags & BRCMSTB_PRIV_FLAGS_GATE_CLOCK)
61
+		enable_clock_gating(host);
62
+}
63
+
64
+static void sdhci_brcmstb_hs400es(struct mmc_host *mmc, struct mmc_ios *ios)
65
+{
66
+	struct sdhci_host *host = mmc_priv(mmc);
67
+
68
+	u32 reg;
69
+
70
+	dev_dbg(mmc_dev(mmc), "%s(): Setting HS400-Enhanced-Strobe mode\n",
71
+		__func__);
72
+	reg = readl(host->ioaddr + SDHCI_VENDOR);
73
+	if (ios->enhanced_strobe)
74
+		reg |= SDHCI_VENDOR_ENHANCED_STRB;
75
+	else
76
+		reg &= ~SDHCI_VENDOR_ENHANCED_STRB;
77
+	writel(reg, host->ioaddr + SDHCI_VENDOR);
78
+}
79
+
80
+static void sdhci_brcmstb_set_clock(struct sdhci_host *host, unsigned int clock)
81
+{
82
+	u16 clk;
83
+
84
+	host->mmc->actual_clock = 0;
85
+
86
+	clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
87
+	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
88
+
89
+	if (clock == 0)
90
+		return;
91
+
92
+	sdhci_enable_clk(host, clk);
93
+}
94
+
95
+static void sdhci_brcmstb_set_uhs_signaling(struct sdhci_host *host,
96
+					    unsigned int timing)
97
+{
98
+	u16 ctrl_2;
99
+
100
+	dev_dbg(mmc_dev(host->mmc), "%s: Setting UHS signaling for %d timing\n",
101
+		__func__, timing);
102
+	ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
103
+	/* Select Bus Speed Mode for host */
104
+	ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
105
+	if ((timing == MMC_TIMING_MMC_HS200) ||
106
+	    (timing == MMC_TIMING_UHS_SDR104))
107
+		ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
108
+	else if (timing == MMC_TIMING_UHS_SDR12)
109
+		ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
110
+	else if (timing == MMC_TIMING_SD_HS ||
111
+		 timing == MMC_TIMING_MMC_HS ||
112
+		 timing == MMC_TIMING_UHS_SDR25)
113
+		ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
114
+	else if (timing == MMC_TIMING_UHS_SDR50)
115
+		ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
116
+	else if ((timing == MMC_TIMING_UHS_DDR50) ||
117
+		 (timing == MMC_TIMING_MMC_DDR52))
118
+		ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
119
+	else if (timing == MMC_TIMING_MMC_HS400)
120
+		ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */
121
+	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
122
+}
123
+
124
+static void sdhci_brcmstb_dumpregs(struct mmc_host *mmc)
125
+{
126
+	sdhci_dumpregs(mmc_priv(mmc));
127
+}
128
+
129
+static void sdhci_brcmstb_cqe_enable(struct mmc_host *mmc)
130
+{
131
+	struct sdhci_host *host = mmc_priv(mmc);
132
+	u32 reg;
133
+
134
+	reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
135
+	while (reg & SDHCI_DATA_AVAILABLE) {
136
+		sdhci_readl(host, SDHCI_BUFFER);
137
+		reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
138
+	}
139
+
140
+	sdhci_cqe_enable(mmc);
141
+}
142
+
143
+static const struct cqhci_host_ops sdhci_brcmstb_cqhci_ops = {
144
+	.enable         = sdhci_brcmstb_cqe_enable,
145
+	.disable        = sdhci_cqe_disable,
146
+	.dumpregs       = sdhci_brcmstb_dumpregs,
147
+};
148
+
149
+static struct sdhci_ops sdhci_brcmstb_ops = {
25150 	.set_clock = sdhci_set_clock,
26151 	.set_bus_width = sdhci_set_bus_width,
27152 	.reset = sdhci_reset,
28153 	.set_uhs_signaling = sdhci_set_uhs_signaling,
29154 };
30155 
31
-static const struct sdhci_pltfm_data sdhci_brcmstb_pdata = {
156
+static struct sdhci_ops sdhci_brcmstb_ops_7216 = {
157
+	.set_clock = sdhci_brcmstb_set_clock,
158
+	.set_bus_width = sdhci_set_bus_width,
159
+	.reset = brcmstb_reset,
160
+	.set_uhs_signaling = sdhci_brcmstb_set_uhs_signaling,
161
+};
162
+
163
+static struct brcmstb_match_priv match_priv_7425 = {
164
+	.flags = BRCMSTB_MATCH_FLAGS_NO_64BIT |
165
+	BRCMSTB_MATCH_FLAGS_BROKEN_TIMEOUT,
32166 	.ops = &sdhci_brcmstb_ops,
33167 };
34168 
169
+static struct brcmstb_match_priv match_priv_7445 = {
170
+	.flags = BRCMSTB_MATCH_FLAGS_BROKEN_TIMEOUT,
171
+	.ops = &sdhci_brcmstb_ops,
172
+};
173
+
174
+static const struct brcmstb_match_priv match_priv_7216 = {
175
+	.flags = BRCMSTB_MATCH_FLAGS_HAS_CLOCK_GATE,
176
+	.hs400es = sdhci_brcmstb_hs400es,
177
+	.ops = &sdhci_brcmstb_ops_7216,
178
+};
179
+
180
+static const struct of_device_id sdhci_brcm_of_match[] = {
181
+	{ .compatible = "brcm,bcm7425-sdhci", .data = &match_priv_7425 },
182
+	{ .compatible = "brcm,bcm7445-sdhci", .data = &match_priv_7445 },
183
+	{ .compatible = "brcm,bcm7216-sdhci", .data = &match_priv_7216 },
184
+	{},
185
+};
186
+
187
+static u32 sdhci_brcmstb_cqhci_irq(struct sdhci_host *host, u32 intmask)
188
+{
189
+	int cmd_error = 0;
190
+	int data_error = 0;
191
+
192
+	if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error))
193
+		return intmask;
194
+
195
+	cqhci_irq(host->mmc, intmask, cmd_error, data_error);
196
+
197
+	return 0;
198
+}
199
+
200
+static int sdhci_brcmstb_add_host(struct sdhci_host *host,
201
+				  struct sdhci_brcmstb_priv *priv)
202
+{
203
+	struct cqhci_host *cq_host;
204
+	bool dma64;
205
+	int ret;
206
+
207
+	if ((priv->flags & BRCMSTB_PRIV_FLAGS_HAS_CQE) == 0)
208
+		return sdhci_add_host(host);
209
+
210
+	dev_dbg(mmc_dev(host->mmc), "CQE is enabled\n");
211
+	host->mmc->caps2 |= MMC_CAP2_CQE | MMC_CAP2_CQE_DCMD;
212
+	ret = sdhci_setup_host(host);
213
+	if (ret)
214
+		return ret;
215
+
216
+	cq_host = devm_kzalloc(mmc_dev(host->mmc),
217
+			       sizeof(*cq_host), GFP_KERNEL);
218
+	if (!cq_host) {
219
+		ret = -ENOMEM;
220
+		goto cleanup;
221
+	}
222
+
223
+	cq_host->mmio = host->ioaddr + SDHCI_ARASAN_CQE_BASE_ADDR;
224
+	cq_host->ops = &sdhci_brcmstb_cqhci_ops;
225
+
226
+	dma64 = host->flags & SDHCI_USE_64_BIT_DMA;
227
+	if (dma64) {
228
+		dev_dbg(mmc_dev(host->mmc), "Using 64 bit DMA\n");
229
+		cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
230
+	}
231
+
232
+	ret = cqhci_init(cq_host, host->mmc, dma64);
233
+	if (ret)
234
+		goto cleanup;
235
+
236
+	ret = __sdhci_add_host(host);
237
+	if (ret)
238
+		goto cleanup;
239
+
240
+	return 0;
241
+
242
+cleanup:
243
+	sdhci_cleanup_host(host);
244
+	return ret;
245
+}
246
+
35247 static int sdhci_brcmstb_probe(struct platform_device *pdev)
36248 {
37
-	struct sdhci_host *host;
249
+	const struct brcmstb_match_priv *match_priv;
250
+	struct sdhci_pltfm_data brcmstb_pdata;
38251 	struct sdhci_pltfm_host *pltfm_host;
252
+	const struct of_device_id *match;
253
+	struct sdhci_brcmstb_priv *priv;
254
+	struct sdhci_host *host;
255
+	struct resource *iomem;
39256 	struct clk *clk;
40257 	int res;
41258 
42
-	clk = devm_clk_get(&pdev->dev, NULL);
43
-	if (IS_ERR(clk)) {
44
-		dev_err(&pdev->dev, "Clock not found in Device Tree\n");
45
-		clk = NULL;
46
-	}
259
+	match = of_match_node(sdhci_brcm_of_match, pdev->dev.of_node);
260
+	match_priv = match->data;
261
+
262
+	dev_dbg(&pdev->dev, "Probe found match for %s\n",  match->compatible);
263
+
264
+	clk = devm_clk_get_optional(&pdev->dev, NULL);
265
+	if (IS_ERR(clk))
266
+		return dev_err_probe(&pdev->dev, PTR_ERR(clk),
267
+				     "Failed to get clock from Device Tree\n");
268
+
47269 	res = clk_prepare_enable(clk);
48270 	if (res)
49271 		return res;
50272 
51
-	host = sdhci_pltfm_init(pdev, &sdhci_brcmstb_pdata, 0);
273
+	memset(&brcmstb_pdata, 0, sizeof(brcmstb_pdata));
274
+	brcmstb_pdata.ops = match_priv->ops;
275
+	host = sdhci_pltfm_init(pdev, &brcmstb_pdata,
276
+				sizeof(struct sdhci_brcmstb_priv));
52277 	if (IS_ERR(host)) {
53278 		res = PTR_ERR(host);
54279 		goto err_clk;
280
+	}
281
+
282
+	pltfm_host = sdhci_priv(host);
283
+	priv = sdhci_pltfm_priv(pltfm_host);
284
+	if (device_property_read_bool(&pdev->dev, "supports-cqe")) {
285
+		priv->flags |= BRCMSTB_PRIV_FLAGS_HAS_CQE;
286
+		match_priv->ops->irq = sdhci_brcmstb_cqhci_irq;
287
+	}
288
+
289
+	/* Map in the non-standard CFG registers */
290
+	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
291
+	priv->cfg_regs = devm_ioremap_resource(&pdev->dev, iomem);
292
+	if (IS_ERR(priv->cfg_regs)) {
293
+		res = PTR_ERR(priv->cfg_regs);
294
+		goto err;
55295 	}
56296 
57297 	sdhci_get_of_property(pdev);
....@@ -60,24 +300,41 @@
60300 		goto err;
61301 
62302 	/*
303
+	 * Automatic clock gating does not work for SD cards that may
304
+	 * voltage switch so only enable it for non-removable devices.
305
+	 */
306
+	if ((match_priv->flags & BRCMSTB_MATCH_FLAGS_HAS_CLOCK_GATE) &&
307
+	    (host->mmc->caps & MMC_CAP_NONREMOVABLE))
308
+		priv->flags |= BRCMSTB_PRIV_FLAGS_GATE_CLOCK;
309
+
310
+	/*
311
+	 * If the chip has enhanced strobe and it's enabled, add
312
+	 * callback
313
+	 */
314
+	if (match_priv->hs400es &&
315
+	    (host->mmc->caps2 & MMC_CAP2_HS400_ES))
316
+		host->mmc_host_ops.hs400_enhanced_strobe = match_priv->hs400es;
317
+
318
+	/*
63319 	 * Supply the existing CAPS, but clear the UHS modes. This
64320 	 * will allow these modes to be specified by device tree
65321 	 * properties through mmc_of_parse().
66322 	 */
67323 	host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
68
-	if (of_device_is_compatible(pdev->dev.of_node, "brcm,bcm7425-sdhci"))
324
+	if (match_priv->flags & BRCMSTB_MATCH_FLAGS_NO_64BIT)
69325 		host->caps &= ~SDHCI_CAN_64BIT;
70326 	host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
71327 	host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
72
-			SDHCI_SUPPORT_DDR50);
73
-	host->quirks |= SDHCI_QUIRK_MISSING_CAPS |
74
-		SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
328
+			 SDHCI_SUPPORT_DDR50);
329
+	host->quirks |= SDHCI_QUIRK_MISSING_CAPS;
75330 
76
-	res = sdhci_add_host(host);
331
+	if (match_priv->flags & BRCMSTB_MATCH_FLAGS_BROKEN_TIMEOUT)
332
+		host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
333
+
334
+	res = sdhci_brcmstb_add_host(host, priv);
77335 	if (res)
78336 		goto err;
79337 
80
-	pltfm_host = sdhci_priv(host);
81338 	pltfm_host->clk = clk;
82339 	return res;
83340 
....@@ -88,21 +345,23 @@
88345 	return res;
89346 }
90347 
91
-static const struct of_device_id sdhci_brcm_of_match[] = {
92
-	{ .compatible = "brcm,bcm7425-sdhci" },
93
-	{ .compatible = "brcm,bcm7445-sdhci" },
94
-	{},
95
-};
348
+static void sdhci_brcmstb_shutdown(struct platform_device *pdev)
349
+{
350
+	sdhci_pltfm_suspend(&pdev->dev);
351
+}
352
+
96353 MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match);
97354 
98355 static struct platform_driver sdhci_brcmstb_driver = {
99356 	.driver		= {
100357 		.name	= "sdhci-brcmstb",
358
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
101359 		.pm	= &sdhci_pltfm_pmops,
102360 		.of_match_table = of_match_ptr(sdhci_brcm_of_match),
103361 	},
104362 	.probe		= sdhci_brcmstb_probe,
105363 	.remove		= sdhci_pltfm_unregister,
364
+	.shutdown	= sdhci_brcmstb_shutdown,
106365 };
107366 
108367 module_platform_driver(sdhci_brcmstb_driver);