ALSA: usb-audio: mixer: volume quirk for ESS Technology Asus USB DAC
[linux/fpc-iii.git] / drivers / usb / host / ehci-npcm7xx.c
blobadaf8fb4b459f7b186b9bd10fca919b0abe292be
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Nuvoton NPCM7xx driver for EHCI HCD
5 * Copyright (C) 2018 Nuvoton Technologies,
6 * Avi Fishman <avi.fishman@nuvoton.com> <avifishman70@gmail.com>
7 * Tomer Maimon <tomer.maimon@nuvoton.com> <tmaimon77@gmail.com>
9 * Based on various ehci-spear.c driver
13 #include <linux/dma-mapping.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/of.h>
18 #include <linux/platform_device.h>
19 #include <linux/pm.h>
20 #include <linux/usb.h>
21 #include <linux/usb/hcd.h>
23 #include "ehci.h"
25 #include <linux/regmap.h>
26 #include <linux/mfd/syscon.h>
28 #define DRIVER_DESC "EHCI npcm7xx driver"
30 static const char hcd_name[] = "npcm7xx-ehci";
32 #define USB2PHYCTL_OFFSET 0x144
34 #define IPSRST2_OFFSET 0x24
35 #define IPSRST3_OFFSET 0x34
38 static struct hc_driver __read_mostly ehci_npcm7xx_hc_driver;
40 #ifdef CONFIG_PM_SLEEP
41 static int ehci_npcm7xx_drv_suspend(struct device *dev)
43 struct usb_hcd *hcd = dev_get_drvdata(dev);
44 bool do_wakeup = device_may_wakeup(dev);
46 return ehci_suspend(hcd, do_wakeup);
49 static int ehci_npcm7xx_drv_resume(struct device *dev)
51 struct usb_hcd *hcd = dev_get_drvdata(dev);
53 ehci_resume(hcd, false);
54 return 0;
56 #endif /* CONFIG_PM_SLEEP */
58 static SIMPLE_DEV_PM_OPS(ehci_npcm7xx_pm_ops, ehci_npcm7xx_drv_suspend,
59 ehci_npcm7xx_drv_resume);
61 static int npcm7xx_ehci_hcd_drv_probe(struct platform_device *pdev)
63 struct usb_hcd *hcd;
64 struct resource *res;
65 struct regmap *gcr_regmap;
66 struct regmap *rst_regmap;
67 const struct hc_driver *driver = &ehci_npcm7xx_hc_driver;
68 int irq;
69 int retval;
71 dev_dbg(&pdev->dev, "initializing npcm7xx ehci USB Controller\n");
73 gcr_regmap = syscon_regmap_lookup_by_compatible("nuvoton,npcm750-gcr");
74 if (IS_ERR(gcr_regmap)) {
75 dev_err(&pdev->dev, "%s: failed to find nuvoton,npcm750-gcr\n",
76 __func__);
77 return PTR_ERR(gcr_regmap);
80 rst_regmap = syscon_regmap_lookup_by_compatible("nuvoton,npcm750-rst");
81 if (IS_ERR(rst_regmap)) {
82 dev_err(&pdev->dev, "%s: failed to find nuvoton,npcm750-rst\n",
83 __func__);
84 return PTR_ERR(rst_regmap);
87 /********* phy init ******/
88 // reset usb host
89 regmap_update_bits(rst_regmap, IPSRST2_OFFSET,
90 (0x1 << 26), (0x1 << 26));
91 regmap_update_bits(rst_regmap, IPSRST3_OFFSET,
92 (0x1 << 25), (0x1 << 25));
93 regmap_update_bits(gcr_regmap, USB2PHYCTL_OFFSET,
94 (0x1 << 28), 0);
96 udelay(1);
98 // enable phy
99 regmap_update_bits(rst_regmap, IPSRST3_OFFSET,
100 (0x1 << 25), 0);
102 udelay(50); // enable phy
104 regmap_update_bits(gcr_regmap, USB2PHYCTL_OFFSET,
105 (0x1 << 28), (0x1 << 28));
107 // enable host
108 regmap_update_bits(rst_regmap, IPSRST2_OFFSET,
109 (0x1 << 26), 0);
111 if (usb_disabled())
112 return -ENODEV;
114 irq = platform_get_irq(pdev, 0);
115 if (irq < 0) {
116 retval = irq;
117 goto fail;
121 * Right now device-tree probed devices don't get dma_mask set.
122 * Since shared usb code relies on it, set it here for now.
123 * Once we have dma capability bindings this can go away.
125 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
126 if (retval)
127 goto fail;
129 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
130 if (!hcd) {
131 retval = -ENOMEM;
132 goto fail;
135 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
136 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
137 if (IS_ERR(hcd->regs)) {
138 retval = PTR_ERR(hcd->regs);
139 goto err_put_hcd;
141 hcd->rsrc_start = res->start;
142 hcd->rsrc_len = resource_size(res);
144 /* registers start at offset 0x0 */
145 hcd_to_ehci(hcd)->caps = hcd->regs;
147 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
148 if (retval)
149 goto err_put_hcd;
151 device_wakeup_enable(hcd->self.controller);
152 return retval;
154 err_put_hcd:
155 usb_put_hcd(hcd);
156 fail:
157 dev_err(&pdev->dev, "init fail, %d\n", retval);
159 return retval;
162 static int npcm7xx_ehci_hcd_drv_remove(struct platform_device *pdev)
164 struct usb_hcd *hcd = platform_get_drvdata(pdev);
166 usb_remove_hcd(hcd);
168 usb_put_hcd(hcd);
170 return 0;
173 static const struct of_device_id npcm7xx_ehci_id_table[] = {
174 { .compatible = "nuvoton,npcm750-ehci" },
175 { },
177 MODULE_DEVICE_TABLE(of, npcm7xx_ehci_id_table);
179 static struct platform_driver npcm7xx_ehci_hcd_driver = {
180 .probe = npcm7xx_ehci_hcd_drv_probe,
181 .remove = npcm7xx_ehci_hcd_drv_remove,
182 .shutdown = usb_hcd_platform_shutdown,
183 .driver = {
184 .name = "npcm7xx-ehci",
185 .bus = &platform_bus_type,
186 .pm = &ehci_npcm7xx_pm_ops,
187 .of_match_table = npcm7xx_ehci_id_table,
191 static int __init ehci_npcm7xx_init(void)
193 if (usb_disabled())
194 return -ENODEV;
196 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
198 ehci_init_driver(&ehci_npcm7xx_hc_driver, NULL);
199 return platform_driver_register(&npcm7xx_ehci_hcd_driver);
201 module_init(ehci_npcm7xx_init);
203 static void __exit ehci_npcm7xx_cleanup(void)
205 platform_driver_unregister(&npcm7xx_ehci_hcd_driver);
207 module_exit(ehci_npcm7xx_cleanup);
209 MODULE_DESCRIPTION(DRIVER_DESC);
210 MODULE_ALIAS("platform:npcm7xx-ehci");
211 MODULE_AUTHOR("Avi Fishman");
212 MODULE_LICENSE("GPL v2");