summaryrefslogtreecommitdiffstats
path: root/drivers/ata/ahci_ceva.c
blob: ec9cfb52c6f668adab77ce9d34baceb765620c7a (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
/*
 * Copyright (C) 2015 Xilinx, Inc.
 * CEVA AHCI SATA platform driver
 *
 * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/ahci_platform.h>
#include <linux/kernel.h>
#include <linux/libata.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include "ahci.h"

/* Vendor Specific Register Offsets */
#define AHCI_VEND_PCFG  0xA4
#define AHCI_VEND_PPCFG 0xA8
#define AHCI_VEND_PP2C  0xAC
#define AHCI_VEND_PP3C  0xB0
#define AHCI_VEND_PP4C  0xB4
#define AHCI_VEND_PP5C  0xB8
#define AHCI_VEND_AXICC 0xBC
#define AHCI_VEND_PAXIC 0xC0
#define AHCI_VEND_PTC   0xC8

/* Vendor Specific Register bit definitions */
#define PAXIC_ADBW_BW64 0x1
#define PAXIC_MAWIDD	(1 << 8)
#define PAXIC_MARIDD	(1 << 16)
#define PAXIC_OTL	(0x4 << 20)

/* Register bit definitions for cache control */
#define AXICC_ARCA_VAL  (0xF << 0)
#define AXICC_ARCF_VAL  (0xF << 4)
#define AXICC_ARCH_VAL  (0xF << 8)
#define AXICC_ARCP_VAL  (0xF << 12)
#define AXICC_AWCFD_VAL (0xF << 16)
#define AXICC_AWCD_VAL  (0xF << 20)
#define AXICC_AWCF_VAL  (0xF << 24)

#define PCFG_TPSS_VAL	(0x32 << 16)
#define PCFG_TPRS_VAL	(0x2 << 12)
#define PCFG_PAD_VAL	0x2

#define PPCFG_TTA	0x1FFFE
#define PPCFG_PSSO_EN	(1 << 28)
#define PPCFG_PSS_EN	(1 << 29)
#define PPCFG_ESDF_EN	(1 << 31)

#define PP5C_RIT	0x60216
#define PP5C_RCT	(0x7f0 << 20)

#define PTC_RX_WM_VAL	0x40
#define PTC_RSVD	(1 << 27)

#define PORT0_BASE	0x100
#define PORT1_BASE	0x180

/* Port Control Register Bit Definitions */
#define PORT_SCTL_SPD_GEN3	(0x3 << 4)
#define PORT_SCTL_SPD_GEN2	(0x2 << 4)
#define PORT_SCTL_SPD_GEN1	(0x1 << 4)
#define PORT_SCTL_IPM		(0x3 << 8)

#define PORT_BASE	0x100
#define PORT_OFFSET	0x80
#define NR_PORTS	2
#define DRV_NAME	"ahci-ceva"
#define CEVA_FLAG_BROKEN_GEN2	1

static unsigned int rx_watermark = PTC_RX_WM_VAL;
module_param(rx_watermark, uint, 0644);
MODULE_PARM_DESC(rx_watermark, "RxWaterMark value (0 - 0x80)");

struct ceva_ahci_priv {
	struct platform_device *ahci_pdev;
	/* Port Phy2Cfg Register */
	u32 pp2c[NR_PORTS];
	u32 pp3c[NR_PORTS];
	u32 pp4c[NR_PORTS];
	u32 pp5c[NR_PORTS];
	/* Axi Cache Control Register */
	u32 axicc;
	bool is_cci_enabled;
	int flags;
};

static unsigned int ceva_ahci_read_id(struct ata_device *dev,
					struct ata_taskfile *tf, u16 *id)
{
	u32 err_mask;

	err_mask = ata_do_dev_read_id(dev, tf, id);
	if (err_mask)
		return err_mask;
	/*
	 * Since CEVA controller does not support device sleep feature, we
	 * need to clear DEVSLP (bit 8) in word78 of the IDENTIFY DEVICE data.
	 */
	id[ATA_ID_FEATURE_SUPP] &= cpu_to_le16(~(1 << 8));

	return 0;
}

static struct ata_port_operations ahci_ceva_ops = {
	.inherits = &ahci_platform_ops,
	.read_id = ceva_ahci_read_id,
};

static const struct ata_port_info ahci_ceva_port_info = {
	.flags          = AHCI_FLAG_COMMON,
	.pio_mask       = ATA_PIO4,
	.udma_mask      = ATA_UDMA6,
	.port_ops	= &ahci_ceva_ops,
};

static void ahci_ceva_setup(struct ahci_host_priv *hpriv)
{
	void __iomem *mmio = hpriv->mmio;
	struct ceva_ahci_priv *cevapriv = hpriv->plat_data;
	u32 tmp;
	int i;

	/*
	 * AXI Data bus width to 64
	 * Set Mem Addr Read, Write ID for data transfers
	 * Transfer limit to 72 DWord
	 */
	tmp = PAXIC_ADBW_BW64 | PAXIC_MAWIDD | PAXIC_MARIDD | PAXIC_OTL;
	writel(tmp, mmio + AHCI_VEND_PAXIC);

	/* Set AHCI Enable */
	tmp = readl(mmio + HOST_CTL);
	tmp |= HOST_AHCI_EN;
	writel(tmp, mmio + HOST_CTL);

	for (i = 0; i < NR_PORTS; i++) {
		/* TPSS TPRS scalars, CISE and Port Addr */
		tmp = PCFG_TPSS_VAL | PCFG_TPRS_VAL | (PCFG_PAD_VAL + i);
		writel(tmp, mmio + AHCI_VEND_PCFG);

		/* Set AXI cache control register if CCi is enabled */
		if (cevapriv->is_cci_enabled) {
			tmp = readl(mmio + AHCI_VEND_AXICC);
			tmp |= AXICC_ARCA_VAL | AXICC_ARCF_VAL |
				AXICC_ARCH_VAL | AXICC_ARCP_VAL |
				AXICC_AWCFD_VAL | AXICC_AWCD_VAL |
				AXICC_AWCF_VAL;
			writel(tmp, mmio + AHCI_VEND_AXICC);
		}

		/* Port Phy Cfg register enables */
		tmp = PPCFG_TTA | PPCFG_PSS_EN | PPCFG_ESDF_EN;
		writel(tmp, mmio + AHCI_VEND_PPCFG);

		/* Phy Control OOB timing parameters COMINIT */
		writel(cevapriv->pp2c[i], mmio + AHCI_VEND_PP2C);

		/* Phy Control OOB timing parameters COMWAKE */
		writel(cevapriv->pp3c[i], mmio + AHCI_VEND_PP3C);

		/* Phy Control Burst timing setting */
		writel(cevapriv->pp4c[i], mmio + AHCI_VEND_PP4C);

		/* Rate Change Timer and Retry Interval Timer setting */
		writel(cevapriv->pp5c[i], mmio + AHCI_VEND_PP5C);

		/* Rx Watermark setting  */
		tmp = rx_watermark | PTC_RSVD;
		writel(tmp, mmio + AHCI_VEND_PTC);

		/* Default to Gen 3 Speed and Gen 1 if Gen2 is broken */
		tmp = PORT_SCTL_SPD_GEN3 | PORT_SCTL_IPM;
		if (cevapriv->flags & CEVA_FLAG_BROKEN_GEN2)
			tmp = PORT_SCTL_SPD_GEN1 | PORT_SCTL_IPM;
		writel(tmp, mmio + PORT_SCR_CTL + PORT_BASE + PORT_OFFSET * i);
	}
}

static struct scsi_host_template ahci_platform_sht = {
	AHCI_SHT(DRV_NAME),
};

static int ceva_ahci_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct device *dev = &pdev->dev;
	struct ahci_host_priv *hpriv;
	struct ceva_ahci_priv *cevapriv;
	enum dev_dma_attr attr;
	int rc;

	cevapriv = devm_kzalloc(dev, sizeof(*cevapriv), GFP_KERNEL);
	if (!cevapriv)
		return -ENOMEM;

	cevapriv->ahci_pdev = pdev;

	hpriv = ahci_platform_get_resources(pdev);
	if (IS_ERR(hpriv))
		return PTR_ERR(hpriv);

	rc = ahci_platform_enable_resources(hpriv);
	if (rc)
		return rc;

	if (of_property_read_bool(np, "ceva,broken-gen2"))
		cevapriv->flags = CEVA_FLAG_BROKEN_GEN2;

	/* Read OOB timing value for COMINIT from device-tree */
	if (of_property_read_u8_array(np, "ceva,p0-cominit-params",
					(u8 *)&cevapriv->pp2c[0], 4) < 0) {
		dev_warn(dev, "ceva,p0-cominit-params property not defined\n");
		return -EINVAL;
	}

	if (of_property_read_u8_array(np, "ceva,p1-cominit-params",
					(u8 *)&cevapriv->pp2c[1], 4) < 0) {
		dev_warn(dev, "ceva,p1-cominit-params property not defined\n");
		return -EINVAL;
	}

	/* Read OOB timing value for COMWAKE from device-tree*/
	if (of_property_read_u8_array(np, "ceva,p0-comwake-params",
					(u8 *)&cevapriv->pp3c[0], 4) < 0) {
		dev_warn(dev, "ceva,p0-comwake-params property not defined\n");
		return -EINVAL;
	}

	if (of_property_read_u8_array(np, "ceva,p1-comwake-params",
					(u8 *)&cevapriv->pp3c[1], 4) < 0) {
		dev_warn(dev, "ceva,p1-comwake-params property not defined\n");
		return -EINVAL;
	}

	/* Read phy BURST timing value from device-tree */
	if (of_property_read_u8_array(np, "ceva,p0-burst-params",
					(u8 *)&cevapriv->pp4c[0], 4) < 0) {
		dev_warn(dev, "ceva,p0-burst-params property not defined\n");
		return -EINVAL;
	}

	if (of_property_read_u8_array(np, "ceva,p1-burst-params",
					(u8 *)&cevapriv->pp4c[1], 4) < 0) {
		dev_warn(dev, "ceva,p1-burst-params property not defined\n");
		return -EINVAL;
	}

	/* Read phy RETRY interval timing value from device-tree */
	if (of_property_read_u16_array(np, "ceva,p0-retry-params",
					(u16 *)&cevapriv->pp5c[0], 2) < 0) {
		dev_warn(dev, "ceva,p0-retry-params property not defined\n");
		return -EINVAL;
	}

	if (of_property_read_u16_array(np, "ceva,p1-retry-params",
					(u16 *)&cevapriv->pp5c[1], 2) < 0) {
		dev_warn(dev, "ceva,p1-retry-params property not defined\n");
		return -EINVAL;
	}

	/*
	 * Check if CCI is enabled for SATA. The DEV_DMA_COHERENT is returned
	 * if CCI is enabled, so check for DEV_DMA_COHERENT.
	 */
	attr = device_get_dma_attr(dev);
	cevapriv->is_cci_enabled = (attr == DEV_DMA_COHERENT);

	hpriv->plat_data = cevapriv;

	/* CEVA specific initialization */
	ahci_ceva_setup(hpriv);

	rc = ahci_platform_init_host(pdev, hpriv, &ahci_ceva_port_info,
					&ahci_platform_sht);
	if (rc)
		goto disable_resources;

	return 0;

disable_resources:
	ahci_platform_disable_resources(hpriv);
	return rc;
}

static int __maybe_unused ceva_ahci_suspend(struct device *dev)
{
	return ahci_platform_suspend_host(dev);
}

static int __maybe_unused ceva_ahci_resume(struct device *dev)
{
	return ahci_platform_resume_host(dev);
}

static SIMPLE_DEV_PM_OPS(ahci_ceva_pm_ops, ceva_ahci_suspend, ceva_ahci_resume);

static const struct of_device_id ceva_ahci_of_match[] = {
	{ .compatible = "ceva,ahci-1v84" },
	{},
};
MODULE_DEVICE_TABLE(of, ceva_ahci_of_match);

static struct platform_driver ceva_ahci_driver = {
	.probe = ceva_ahci_probe,
	.remove = ata_platform_remove_one,
	.driver = {
		.name = DRV_NAME,
		.of_match_table = ceva_ahci_of_match,
		.pm = &ahci_ceva_pm_ops,
	},
};
module_platform_driver(ceva_ahci_driver);

MODULE_DESCRIPTION("CEVA AHCI SATA platform driver");
MODULE_AUTHOR("Xilinx Inc.");
MODULE_LICENSE("GPL v2");