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ccfde508 MP |
1 | /* |
2 | * drivers/ata/ahci_tegra.c | |
3 | * | |
4 | * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved. | |
5 | * | |
6 | * Author: | |
7 | * Mikko Perttunen <mperttunen@nvidia.com> | |
8 | * | |
9 | * This software is licensed under the terms of the GNU General Public | |
10 | * License version 2, as published by the Free Software Foundation, and | |
11 | * may be copied, distributed, and modified under those terms. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | */ | |
19 | ||
20 | #include <linux/ahci_platform.h> | |
21 | #include <linux/reset.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/of_device.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/tegra-powergate.h> | |
28 | #include <linux/regulator/consumer.h> | |
29 | #include "ahci.h" | |
30 | ||
31 | #define SATA_CONFIGURATION_0 0x180 | |
32 | #define SATA_CONFIGURATION_EN_FPCI BIT(0) | |
33 | ||
34 | #define SCFG_OFFSET 0x1000 | |
35 | ||
36 | #define T_SATA0_CFG_1 0x04 | |
37 | #define T_SATA0_CFG_1_IO_SPACE BIT(0) | |
38 | #define T_SATA0_CFG_1_MEMORY_SPACE BIT(1) | |
39 | #define T_SATA0_CFG_1_BUS_MASTER BIT(2) | |
40 | #define T_SATA0_CFG_1_SERR BIT(8) | |
41 | ||
42 | #define T_SATA0_CFG_9 0x24 | |
43 | #define T_SATA0_CFG_9_BASE_ADDRESS_SHIFT 13 | |
44 | ||
45 | #define SATA_FPCI_BAR5 0x94 | |
46 | #define SATA_FPCI_BAR5_START_SHIFT 4 | |
47 | ||
48 | #define SATA_INTR_MASK 0x188 | |
49 | #define SATA_INTR_MASK_IP_INT_MASK BIT(16) | |
50 | ||
51 | #define T_SATA0_AHCI_HBA_CAP_BKDR 0x300 | |
52 | ||
53 | #define T_SATA0_BKDOOR_CC 0x4a4 | |
54 | ||
55 | #define T_SATA0_CFG_SATA 0x54c | |
56 | #define T_SATA0_CFG_SATA_BACKDOOR_PROG_IF_EN BIT(12) | |
57 | ||
58 | #define T_SATA0_CFG_MISC 0x550 | |
59 | ||
60 | #define T_SATA0_INDEX 0x680 | |
61 | ||
62 | #define T_SATA0_CHX_PHY_CTRL1_GEN1 0x690 | |
63 | #define T_SATA0_CHX_PHY_CTRL1_GEN1_TX_AMP_MASK 0xff | |
64 | #define T_SATA0_CHX_PHY_CTRL1_GEN1_TX_AMP_SHIFT 0 | |
65 | #define T_SATA0_CHX_PHY_CTRL1_GEN1_TX_PEAK_MASK (0xff << 8) | |
66 | #define T_SATA0_CHX_PHY_CTRL1_GEN1_TX_PEAK_SHIFT 8 | |
67 | ||
68 | #define T_SATA0_CHX_PHY_CTRL1_GEN2 0x694 | |
69 | #define T_SATA0_CHX_PHY_CTRL1_GEN2_TX_AMP_MASK 0xff | |
70 | #define T_SATA0_CHX_PHY_CTRL1_GEN2_TX_AMP_SHIFT 0 | |
71 | #define T_SATA0_CHX_PHY_CTRL1_GEN2_TX_PEAK_MASK (0xff << 12) | |
72 | #define T_SATA0_CHX_PHY_CTRL1_GEN2_TX_PEAK_SHIFT 12 | |
73 | ||
74 | #define T_SATA0_CHX_PHY_CTRL2 0x69c | |
75 | #define T_SATA0_CHX_PHY_CTRL2_CDR_CNTL_GEN1 0x23 | |
76 | ||
77 | #define T_SATA0_CHX_PHY_CTRL11 0x6d0 | |
78 | #define T_SATA0_CHX_PHY_CTRL11_GEN2_RX_EQ (0x2800 << 16) | |
79 | ||
80 | #define FUSE_SATA_CALIB 0x124 | |
81 | #define FUSE_SATA_CALIB_MASK 0x3 | |
82 | ||
83 | struct sata_pad_calibration { | |
84 | u8 gen1_tx_amp; | |
85 | u8 gen1_tx_peak; | |
86 | u8 gen2_tx_amp; | |
87 | u8 gen2_tx_peak; | |
88 | }; | |
89 | ||
90 | static const struct sata_pad_calibration tegra124_pad_calibration[] = { | |
91 | {0x18, 0x04, 0x18, 0x0a}, | |
92 | {0x0e, 0x04, 0x14, 0x0a}, | |
93 | {0x0e, 0x07, 0x1a, 0x0e}, | |
94 | {0x14, 0x0e, 0x1a, 0x0e}, | |
95 | }; | |
96 | ||
97 | struct tegra_ahci_priv { | |
98 | struct platform_device *pdev; | |
99 | void __iomem *sata_regs; | |
100 | struct reset_control *sata_rst; | |
101 | struct reset_control *sata_oob_rst; | |
102 | struct reset_control *sata_cold_rst; | |
103 | /* Needs special handling, cannot use ahci_platform */ | |
104 | struct clk *sata_clk; | |
105 | struct regulator_bulk_data supplies[5]; | |
106 | }; | |
107 | ||
108 | static int tegra_ahci_power_on(struct ahci_host_priv *hpriv) | |
109 | { | |
110 | struct tegra_ahci_priv *tegra = hpriv->plat_data; | |
111 | int ret; | |
112 | ||
113 | ret = regulator_bulk_enable(ARRAY_SIZE(tegra->supplies), | |
114 | tegra->supplies); | |
115 | if (ret) | |
116 | return ret; | |
117 | ||
118 | ret = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_SATA, | |
119 | tegra->sata_clk, | |
120 | tegra->sata_rst); | |
121 | if (ret) | |
122 | goto disable_regulators; | |
123 | ||
124 | reset_control_assert(tegra->sata_oob_rst); | |
125 | reset_control_assert(tegra->sata_cold_rst); | |
126 | ||
127 | ret = ahci_platform_enable_resources(hpriv); | |
128 | if (ret) | |
129 | goto disable_power; | |
130 | ||
131 | reset_control_deassert(tegra->sata_cold_rst); | |
132 | reset_control_deassert(tegra->sata_oob_rst); | |
133 | ||
134 | return 0; | |
135 | ||
136 | disable_power: | |
137 | clk_disable_unprepare(tegra->sata_clk); | |
138 | ||
139 | tegra_powergate_power_off(TEGRA_POWERGATE_SATA); | |
140 | ||
141 | disable_regulators: | |
142 | regulator_bulk_disable(ARRAY_SIZE(tegra->supplies), tegra->supplies); | |
143 | ||
144 | return ret; | |
145 | } | |
146 | ||
147 | static void tegra_ahci_power_off(struct ahci_host_priv *hpriv) | |
148 | { | |
149 | struct tegra_ahci_priv *tegra = hpriv->plat_data; | |
150 | ||
151 | ahci_platform_disable_resources(hpriv); | |
152 | ||
153 | reset_control_assert(tegra->sata_rst); | |
154 | reset_control_assert(tegra->sata_oob_rst); | |
155 | reset_control_assert(tegra->sata_cold_rst); | |
156 | ||
157 | clk_disable_unprepare(tegra->sata_clk); | |
158 | tegra_powergate_power_off(TEGRA_POWERGATE_SATA); | |
159 | ||
160 | regulator_bulk_disable(ARRAY_SIZE(tegra->supplies), tegra->supplies); | |
161 | } | |
162 | ||
163 | static int tegra_ahci_controller_init(struct ahci_host_priv *hpriv) | |
164 | { | |
165 | struct tegra_ahci_priv *tegra = hpriv->plat_data; | |
166 | int ret; | |
167 | unsigned int val; | |
168 | struct sata_pad_calibration calib; | |
169 | ||
170 | ret = tegra_ahci_power_on(hpriv); | |
171 | if (ret) { | |
172 | dev_err(&tegra->pdev->dev, | |
173 | "failed to power on AHCI controller: %d\n", ret); | |
174 | return ret; | |
175 | } | |
176 | ||
177 | val = readl(tegra->sata_regs + SATA_CONFIGURATION_0); | |
178 | val |= SATA_CONFIGURATION_EN_FPCI; | |
179 | writel(val, tegra->sata_regs + SATA_CONFIGURATION_0); | |
180 | ||
181 | /* Pad calibration */ | |
182 | ||
183 | /* FIXME Always use calibration 0. Change this to read the calibration | |
184 | * fuse once the fuse driver has landed. */ | |
185 | val = 0; | |
186 | ||
187 | calib = tegra124_pad_calibration[val & FUSE_SATA_CALIB_MASK]; | |
188 | ||
189 | writel(BIT(0), tegra->sata_regs + SCFG_OFFSET + T_SATA0_INDEX); | |
190 | ||
191 | val = readl(tegra->sata_regs + | |
192 | SCFG_OFFSET + T_SATA0_CHX_PHY_CTRL1_GEN1); | |
193 | val &= ~T_SATA0_CHX_PHY_CTRL1_GEN1_TX_AMP_MASK; | |
194 | val &= ~T_SATA0_CHX_PHY_CTRL1_GEN1_TX_PEAK_MASK; | |
195 | val |= calib.gen1_tx_amp << | |
196 | T_SATA0_CHX_PHY_CTRL1_GEN1_TX_AMP_SHIFT; | |
197 | val |= calib.gen1_tx_peak << | |
198 | T_SATA0_CHX_PHY_CTRL1_GEN1_TX_PEAK_SHIFT; | |
199 | writel(val, tegra->sata_regs + SCFG_OFFSET + | |
200 | T_SATA0_CHX_PHY_CTRL1_GEN1); | |
201 | ||
202 | val = readl(tegra->sata_regs + | |
203 | SCFG_OFFSET + T_SATA0_CHX_PHY_CTRL1_GEN2); | |
204 | val &= ~T_SATA0_CHX_PHY_CTRL1_GEN2_TX_AMP_MASK; | |
205 | val &= ~T_SATA0_CHX_PHY_CTRL1_GEN2_TX_PEAK_MASK; | |
206 | val |= calib.gen2_tx_amp << | |
207 | T_SATA0_CHX_PHY_CTRL1_GEN1_TX_AMP_SHIFT; | |
208 | val |= calib.gen2_tx_peak << | |
209 | T_SATA0_CHX_PHY_CTRL1_GEN1_TX_PEAK_SHIFT; | |
210 | writel(val, tegra->sata_regs + SCFG_OFFSET + | |
211 | T_SATA0_CHX_PHY_CTRL1_GEN2); | |
212 | ||
213 | writel(T_SATA0_CHX_PHY_CTRL11_GEN2_RX_EQ, | |
214 | tegra->sata_regs + SCFG_OFFSET + T_SATA0_CHX_PHY_CTRL11); | |
215 | writel(T_SATA0_CHX_PHY_CTRL2_CDR_CNTL_GEN1, | |
216 | tegra->sata_regs + SCFG_OFFSET + T_SATA0_CHX_PHY_CTRL2); | |
217 | ||
218 | writel(0, tegra->sata_regs + SCFG_OFFSET + T_SATA0_INDEX); | |
219 | ||
220 | /* Program controller device ID */ | |
221 | ||
222 | val = readl(tegra->sata_regs + SCFG_OFFSET + T_SATA0_CFG_SATA); | |
223 | val |= T_SATA0_CFG_SATA_BACKDOOR_PROG_IF_EN; | |
224 | writel(val, tegra->sata_regs + SCFG_OFFSET + T_SATA0_CFG_SATA); | |
225 | ||
226 | writel(0x01060100, tegra->sata_regs + SCFG_OFFSET + T_SATA0_BKDOOR_CC); | |
227 | ||
228 | val = readl(tegra->sata_regs + SCFG_OFFSET + T_SATA0_CFG_SATA); | |
229 | val &= ~T_SATA0_CFG_SATA_BACKDOOR_PROG_IF_EN; | |
230 | writel(val, tegra->sata_regs + SCFG_OFFSET + T_SATA0_CFG_SATA); | |
231 | ||
232 | /* Enable IO & memory access, bus master mode */ | |
233 | ||
234 | val = readl(tegra->sata_regs + SCFG_OFFSET + T_SATA0_CFG_1); | |
235 | val |= T_SATA0_CFG_1_IO_SPACE | T_SATA0_CFG_1_MEMORY_SPACE | | |
236 | T_SATA0_CFG_1_BUS_MASTER | T_SATA0_CFG_1_SERR; | |
237 | writel(val, tegra->sata_regs + SCFG_OFFSET + T_SATA0_CFG_1); | |
238 | ||
239 | /* Program SATA MMIO */ | |
240 | ||
241 | writel(0x10000 << SATA_FPCI_BAR5_START_SHIFT, | |
242 | tegra->sata_regs + SATA_FPCI_BAR5); | |
243 | ||
244 | writel(0x08000 << T_SATA0_CFG_9_BASE_ADDRESS_SHIFT, | |
245 | tegra->sata_regs + SCFG_OFFSET + T_SATA0_CFG_9); | |
246 | ||
247 | /* Unmask SATA interrupts */ | |
248 | ||
249 | val = readl(tegra->sata_regs + SATA_INTR_MASK); | |
250 | val |= SATA_INTR_MASK_IP_INT_MASK; | |
251 | writel(val, tegra->sata_regs + SATA_INTR_MASK); | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | static void tegra_ahci_controller_deinit(struct ahci_host_priv *hpriv) | |
257 | { | |
258 | tegra_ahci_power_off(hpriv); | |
259 | } | |
260 | ||
261 | static void tegra_ahci_host_stop(struct ata_host *host) | |
262 | { | |
263 | struct ahci_host_priv *hpriv = host->private_data; | |
264 | ||
265 | tegra_ahci_controller_deinit(hpriv); | |
266 | } | |
267 | ||
268 | static struct ata_port_operations ahci_tegra_port_ops = { | |
269 | .inherits = &ahci_ops, | |
270 | .host_stop = tegra_ahci_host_stop, | |
271 | }; | |
272 | ||
273 | static const struct ata_port_info ahci_tegra_port_info = { | |
274 | .flags = AHCI_FLAG_COMMON, | |
275 | .pio_mask = ATA_PIO4, | |
276 | .udma_mask = ATA_UDMA6, | |
277 | .port_ops = &ahci_tegra_port_ops, | |
278 | }; | |
279 | ||
280 | static const struct of_device_id tegra_ahci_of_match[] = { | |
281 | { .compatible = "nvidia,tegra124-ahci" }, | |
282 | {} | |
283 | }; | |
284 | MODULE_DEVICE_TABLE(of, tegra_ahci_of_match); | |
285 | ||
286 | static int tegra_ahci_probe(struct platform_device *pdev) | |
287 | { | |
288 | struct ahci_host_priv *hpriv; | |
289 | struct tegra_ahci_priv *tegra; | |
290 | struct resource *res; | |
291 | int ret; | |
292 | ||
293 | hpriv = ahci_platform_get_resources(pdev); | |
294 | if (IS_ERR(hpriv)) | |
295 | return PTR_ERR(hpriv); | |
296 | ||
297 | tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL); | |
298 | if (!tegra) | |
299 | return -ENOMEM; | |
300 | ||
301 | hpriv->plat_data = tegra; | |
302 | ||
303 | tegra->pdev = pdev; | |
304 | ||
305 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
306 | tegra->sata_regs = devm_ioremap_resource(&pdev->dev, res); | |
307 | if (IS_ERR(tegra->sata_regs)) | |
308 | return PTR_ERR(tegra->sata_regs); | |
309 | ||
310 | tegra->sata_rst = devm_reset_control_get(&pdev->dev, "sata"); | |
311 | if (IS_ERR(tegra->sata_rst)) { | |
312 | dev_err(&pdev->dev, "Failed to get sata reset\n"); | |
313 | return PTR_ERR(tegra->sata_rst); | |
314 | } | |
315 | ||
316 | tegra->sata_oob_rst = devm_reset_control_get(&pdev->dev, "sata-oob"); | |
317 | if (IS_ERR(tegra->sata_oob_rst)) { | |
318 | dev_err(&pdev->dev, "Failed to get sata-oob reset\n"); | |
319 | return PTR_ERR(tegra->sata_oob_rst); | |
320 | } | |
321 | ||
322 | tegra->sata_cold_rst = devm_reset_control_get(&pdev->dev, "sata-cold"); | |
323 | if (IS_ERR(tegra->sata_cold_rst)) { | |
324 | dev_err(&pdev->dev, "Failed to get sata-cold reset\n"); | |
325 | return PTR_ERR(tegra->sata_cold_rst); | |
326 | } | |
327 | ||
328 | tegra->sata_clk = devm_clk_get(&pdev->dev, "sata"); | |
329 | if (IS_ERR(tegra->sata_clk)) { | |
330 | dev_err(&pdev->dev, "Failed to get sata clock\n"); | |
331 | return PTR_ERR(tegra->sata_clk); | |
332 | } | |
333 | ||
334 | tegra->supplies[0].supply = "avdd"; | |
335 | tegra->supplies[1].supply = "hvdd"; | |
336 | tegra->supplies[2].supply = "vddio"; | |
337 | tegra->supplies[3].supply = "target-5v"; | |
338 | tegra->supplies[4].supply = "target-12v"; | |
339 | ||
340 | ret = devm_regulator_bulk_get(&pdev->dev, ARRAY_SIZE(tegra->supplies), | |
341 | tegra->supplies); | |
342 | if (ret) { | |
343 | dev_err(&pdev->dev, "Failed to get regulators\n"); | |
344 | return ret; | |
345 | } | |
346 | ||
347 | ret = tegra_ahci_controller_init(hpriv); | |
348 | if (ret) | |
349 | return ret; | |
350 | ||
725c7b57 | 351 | ret = ahci_platform_init_host(pdev, hpriv, &ahci_tegra_port_info); |
ccfde508 MP |
352 | if (ret) |
353 | goto deinit_controller; | |
354 | ||
355 | return 0; | |
356 | ||
357 | deinit_controller: | |
358 | tegra_ahci_controller_deinit(hpriv); | |
359 | ||
360 | return ret; | |
361 | }; | |
362 | ||
363 | static struct platform_driver tegra_ahci_driver = { | |
364 | .probe = tegra_ahci_probe, | |
365 | .remove = ata_platform_remove_one, | |
366 | .driver = { | |
367 | .name = "tegra-ahci", | |
368 | .of_match_table = tegra_ahci_of_match, | |
369 | }, | |
370 | /* LP0 suspend support not implemented */ | |
371 | }; | |
372 | module_platform_driver(tegra_ahci_driver); | |
373 | ||
374 | MODULE_AUTHOR("Mikko Perttunen <mperttunen@nvidia.com>"); | |
375 | MODULE_DESCRIPTION("Tegra124 AHCI SATA driver"); | |
376 | MODULE_LICENSE("GPL v2"); |