1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2012 STMicroelectronics Limited
  4 *
  5 * Authors: Francesco Virlinzi <francesco.virlinzi@st.com>
  6 *	    Alexandre Torgue <alexandre.torgue@st.com>
  7 */
  8
  9#include <linux/init.h>
 10#include <linux/module.h>
 11#include <linux/export.h>
 12#include <linux/platform_device.h>
 13#include <linux/clk.h>
 14#include <linux/of.h>
 15#include <linux/ahci_platform.h>
 16#include <linux/libata.h>
 17#include <linux/reset.h>
 18#include <linux/io.h>
 19#include <linux/dma-mapping.h>
 20
 21#include "ahci.h"
 22
 23#define DRV_NAME  "st_ahci"
 24
 25#define ST_AHCI_OOBR			0xbc
 26#define ST_AHCI_OOBR_WE			BIT(31)
 27#define ST_AHCI_OOBR_CWMIN_SHIFT	24
 28#define ST_AHCI_OOBR_CWMAX_SHIFT	16
 29#define ST_AHCI_OOBR_CIMIN_SHIFT	8
 30#define ST_AHCI_OOBR_CIMAX_SHIFT	0
 31
 32struct st_ahci_drv_data {
 33	struct reset_control *pwr;
 34	struct reset_control *sw_rst;
 35	struct reset_control *pwr_rst;
 36};
 37
 38static void st_ahci_configure_oob(void __iomem *mmio)
 39{
 40	unsigned long old_val, new_val;
 41
 42	new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) |
 43		  (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) |
 44		  (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) |
 45		  (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT);
 46
 47	old_val = readl(mmio + ST_AHCI_OOBR);
 48	writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
 49	writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
 50	writel(new_val, mmio + ST_AHCI_OOBR);
 51}
 52
 53static int st_ahci_deassert_resets(struct ahci_host_priv *hpriv,
 54				struct device *dev)
 55{
 56	struct st_ahci_drv_data *drv_data = hpriv->plat_data;
 57	int err;
 58
 59	if (drv_data->pwr) {
 60		err = reset_control_deassert(drv_data->pwr);
 61		if (err) {
 62			dev_err(dev, "unable to bring out of pwrdwn\n");
 63			return err;
 64		}
 65	}
 66
 67	if (drv_data->sw_rst) {
 68		err = reset_control_deassert(drv_data->sw_rst);
 69		if (err) {
 70			dev_err(dev, "unable to bring out of sw-rst\n");
 71			return err;
 72		}
 73	}
 74
 75	if (drv_data->pwr_rst) {
 76		err = reset_control_deassert(drv_data->pwr_rst);
 77		if (err) {
 78			dev_err(dev, "unable to bring out of pwr-rst\n");
 79			return err;
 80		}
 81	}
 82
 83	return 0;
 84}
 85
 86static void st_ahci_host_stop(struct ata_host *host)
 87{
 88	struct ahci_host_priv *hpriv = host->private_data;
 89	struct st_ahci_drv_data *drv_data = hpriv->plat_data;
 90	struct device *dev = host->dev;
 91	int err;
 92
 93	if (drv_data->pwr) {
 94		err = reset_control_assert(drv_data->pwr);
 95		if (err)
 96			dev_err(dev, "unable to pwrdwn\n");
 97	}
 98
 99	ahci_platform_disable_resources(hpriv);
100}
101
102static int st_ahci_probe_resets(struct ahci_host_priv *hpriv,
103				struct device *dev)
104{
105	struct st_ahci_drv_data *drv_data = hpriv->plat_data;
106
107	drv_data->pwr = devm_reset_control_get(dev, "pwr-dwn");
108	if (IS_ERR(drv_data->pwr)) {
109		dev_info(dev, "power reset control not defined\n");
110		drv_data->pwr = NULL;
111	}
112
113	drv_data->sw_rst = devm_reset_control_get(dev, "sw-rst");
114	if (IS_ERR(drv_data->sw_rst)) {
115		dev_info(dev, "soft reset control not defined\n");
116		drv_data->sw_rst = NULL;
117	}
118
119	drv_data->pwr_rst = devm_reset_control_get(dev, "pwr-rst");
120	if (IS_ERR(drv_data->pwr_rst)) {
121		dev_dbg(dev, "power soft reset control not defined\n");
122		drv_data->pwr_rst = NULL;
123	}
124
125	return st_ahci_deassert_resets(hpriv, dev);
126}
127
128static struct ata_port_operations st_ahci_port_ops = {
129	.inherits	= &ahci_platform_ops,
130	.host_stop	= st_ahci_host_stop,
131};
132
133static const struct ata_port_info st_ahci_port_info = {
134	.flags          = AHCI_FLAG_COMMON,
135	.pio_mask       = ATA_PIO4,
136	.udma_mask      = ATA_UDMA6,
137	.port_ops       = &st_ahci_port_ops,
138};
139
140static const struct scsi_host_template ahci_platform_sht = {
141	AHCI_SHT(DRV_NAME),
142};
143
144static int st_ahci_probe(struct platform_device *pdev)
145{
146	struct st_ahci_drv_data *drv_data;
147	struct ahci_host_priv *hpriv;
148	int err;
149
150	drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
151	if (!drv_data)
152		return -ENOMEM;
153
154	hpriv = ahci_platform_get_resources(pdev, 0);
155	if (IS_ERR(hpriv))
156		return PTR_ERR(hpriv);
157	hpriv->plat_data = drv_data;
158
159	err = st_ahci_probe_resets(hpriv, &pdev->dev);
160	if (err)
161		return err;
162
163	err = ahci_platform_enable_resources(hpriv);
164	if (err)
165		return err;
166
167	st_ahci_configure_oob(hpriv->mmio);
168
169	err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,
170				      &ahci_platform_sht);
171	if (err) {
172		ahci_platform_disable_resources(hpriv);
173		return err;
174	}
175
176	return 0;
177}
178
179#ifdef CONFIG_PM_SLEEP
180static int st_ahci_suspend(struct device *dev)
181{
182	struct ata_host *host = dev_get_drvdata(dev);
183	struct ahci_host_priv *hpriv = host->private_data;
184	struct st_ahci_drv_data *drv_data = hpriv->plat_data;
185	int err;
186
187	err = ahci_platform_suspend_host(dev);
188	if (err)
189		return err;
190
191	if (drv_data->pwr) {
192		err = reset_control_assert(drv_data->pwr);
193		if (err) {
194			dev_err(dev, "unable to pwrdwn");
195			return err;
196		}
197	}
198
199	ahci_platform_disable_resources(hpriv);
200
201	return 0;
202}
203
204static int st_ahci_resume(struct device *dev)
205{
206	struct ata_host *host = dev_get_drvdata(dev);
207	struct ahci_host_priv *hpriv = host->private_data;
208	int err;
209
210	err = ahci_platform_enable_resources(hpriv);
211	if (err)
212		return err;
213
214	err = st_ahci_deassert_resets(hpriv, dev);
215	if (err) {
216		ahci_platform_disable_resources(hpriv);
217		return err;
218	}
219
220	st_ahci_configure_oob(hpriv->mmio);
221
222	return ahci_platform_resume_host(dev);
223}
224#endif
225
226static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
227
228static const struct of_device_id st_ahci_match[] = {
229	{ .compatible = "st,ahci", },
230	{ /* sentinel */ }
231};
232MODULE_DEVICE_TABLE(of, st_ahci_match);
233
234static struct platform_driver st_ahci_driver = {
235	.driver = {
236		.name = DRV_NAME,
237		.pm = &st_ahci_pm_ops,
238		.of_match_table = st_ahci_match,
239	},
240	.probe = st_ahci_probe,
241	.remove = ata_platform_remove_one,
242};
243module_platform_driver(st_ahci_driver);
244
245MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
246MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
247MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
248MODULE_LICENSE("GPL v2");