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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Nuvoton NPCM7xx driver for EHCI HCD
4 *
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>
8 *
9 * Based on various ehci-spear.c driver
10 */
11
12
13#include <linux/dma-mapping.h>
14
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>
22
23#include "ehci.h"
24
25#define DRIVER_DESC "EHCI npcm7xx driver"
26
27static struct hc_driver __read_mostly ehci_npcm7xx_hc_driver;
28
29static int __maybe_unused ehci_npcm7xx_drv_suspend(struct device *dev)
30{
31 struct usb_hcd *hcd = dev_get_drvdata(dev);
32 bool do_wakeup = device_may_wakeup(dev);
33
34 return ehci_suspend(hcd, do_wakeup);
35}
36
37static int __maybe_unused ehci_npcm7xx_drv_resume(struct device *dev)
38{
39 struct usb_hcd *hcd = dev_get_drvdata(dev);
40
41 ehci_resume(hcd, false);
42 return 0;
43}
44
45static SIMPLE_DEV_PM_OPS(ehci_npcm7xx_pm_ops, ehci_npcm7xx_drv_suspend,
46 ehci_npcm7xx_drv_resume);
47
48static int npcm7xx_ehci_hcd_drv_probe(struct platform_device *pdev)
49{
50 struct usb_hcd *hcd;
51 struct resource *res;
52 const struct hc_driver *driver = &ehci_npcm7xx_hc_driver;
53 int irq;
54 int retval;
55
56 dev_dbg(&pdev->dev, "initializing npcm7xx ehci USB Controller\n");
57
58 if (usb_disabled())
59 return -ENODEV;
60
61 irq = platform_get_irq(pdev, 0);
62 if (irq < 0) {
63 retval = irq;
64 goto fail;
65 }
66
67 /*
68 * Right now device-tree probed devices don't get dma_mask set.
69 * Since shared usb code relies on it, set it here for now.
70 * Once we have dma capability bindings this can go away.
71 */
72 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
73 if (retval)
74 goto fail;
75
76 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
77 if (!hcd) {
78 retval = -ENOMEM;
79 goto fail;
80 }
81
82 hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
83 if (IS_ERR(hcd->regs)) {
84 retval = PTR_ERR(hcd->regs);
85 goto err_put_hcd;
86 }
87 hcd->rsrc_start = res->start;
88 hcd->rsrc_len = resource_size(res);
89
90 /* registers start at offset 0x0 */
91 hcd_to_ehci(hcd)->caps = hcd->regs;
92
93 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
94 if (retval)
95 goto err_put_hcd;
96
97 device_wakeup_enable(hcd->self.controller);
98 return retval;
99
100err_put_hcd:
101 usb_put_hcd(hcd);
102fail:
103 dev_err(&pdev->dev, "init fail, %d\n", retval);
104
105 return retval;
106}
107
108static void npcm7xx_ehci_hcd_drv_remove(struct platform_device *pdev)
109{
110 struct usb_hcd *hcd = platform_get_drvdata(pdev);
111
112 usb_remove_hcd(hcd);
113
114 usb_put_hcd(hcd);
115}
116
117static const struct of_device_id npcm7xx_ehci_id_table[] = {
118 { .compatible = "nuvoton,npcm750-ehci" },
119 { },
120};
121MODULE_DEVICE_TABLE(of, npcm7xx_ehci_id_table);
122
123static struct platform_driver npcm7xx_ehci_hcd_driver = {
124 .probe = npcm7xx_ehci_hcd_drv_probe,
125 .remove_new = npcm7xx_ehci_hcd_drv_remove,
126 .shutdown = usb_hcd_platform_shutdown,
127 .driver = {
128 .name = "npcm7xx-ehci",
129 .bus = &platform_bus_type,
130 .pm = pm_ptr(&ehci_npcm7xx_pm_ops),
131 .of_match_table = npcm7xx_ehci_id_table,
132 }
133};
134
135static int __init ehci_npcm7xx_init(void)
136{
137 if (usb_disabled())
138 return -ENODEV;
139
140 ehci_init_driver(&ehci_npcm7xx_hc_driver, NULL);
141 return platform_driver_register(&npcm7xx_ehci_hcd_driver);
142}
143module_init(ehci_npcm7xx_init);
144
145static void __exit ehci_npcm7xx_cleanup(void)
146{
147 platform_driver_unregister(&npcm7xx_ehci_hcd_driver);
148}
149module_exit(ehci_npcm7xx_cleanup);
150
151MODULE_DESCRIPTION(DRIVER_DESC);
152MODULE_ALIAS("platform:npcm7xx-ehci");
153MODULE_AUTHOR("Avi Fishman");
154MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Nuvoton NPCM7xx driver for EHCI HCD
4 *
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>
8 *
9 * Based on various ehci-spear.c driver
10 */
11
12
13#include <linux/dma-mapping.h>
14
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>
22
23#include "ehci.h"
24
25#include <linux/regmap.h>
26#include <linux/mfd/syscon.h>
27
28#define DRIVER_DESC "EHCI npcm7xx driver"
29
30static const char hcd_name[] = "npcm7xx-ehci";
31
32#define USB2PHYCTL_OFFSET 0x144
33
34#define IPSRST2_OFFSET 0x24
35#define IPSRST3_OFFSET 0x34
36
37
38static struct hc_driver __read_mostly ehci_npcm7xx_hc_driver;
39
40#ifdef CONFIG_PM_SLEEP
41static int ehci_npcm7xx_drv_suspend(struct device *dev)
42{
43 struct usb_hcd *hcd = dev_get_drvdata(dev);
44 bool do_wakeup = device_may_wakeup(dev);
45
46 return ehci_suspend(hcd, do_wakeup);
47}
48
49static int ehci_npcm7xx_drv_resume(struct device *dev)
50{
51 struct usb_hcd *hcd = dev_get_drvdata(dev);
52
53 ehci_resume(hcd, false);
54 return 0;
55}
56#endif /* CONFIG_PM_SLEEP */
57
58static SIMPLE_DEV_PM_OPS(ehci_npcm7xx_pm_ops, ehci_npcm7xx_drv_suspend,
59 ehci_npcm7xx_drv_resume);
60
61static int npcm7xx_ehci_hcd_drv_probe(struct platform_device *pdev)
62{
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;
70
71 dev_dbg(&pdev->dev, "initializing npcm7xx ehci USB Controller\n");
72
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);
78 }
79
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);
85 }
86
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);
95
96 udelay(1);
97
98 // enable phy
99 regmap_update_bits(rst_regmap, IPSRST3_OFFSET,
100 (0x1 << 25), 0);
101
102 udelay(50); // enable phy
103
104 regmap_update_bits(gcr_regmap, USB2PHYCTL_OFFSET,
105 (0x1 << 28), (0x1 << 28));
106
107 // enable host
108 regmap_update_bits(rst_regmap, IPSRST2_OFFSET,
109 (0x1 << 26), 0);
110
111 if (usb_disabled())
112 return -ENODEV;
113
114 irq = platform_get_irq(pdev, 0);
115 if (irq < 0) {
116 retval = irq;
117 goto fail;
118 }
119
120 /*
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.
124 */
125 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
126 if (retval)
127 goto fail;
128
129 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
130 if (!hcd) {
131 retval = -ENOMEM;
132 goto fail;
133 }
134
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;
140 }
141 hcd->rsrc_start = res->start;
142 hcd->rsrc_len = resource_size(res);
143
144 /* registers start at offset 0x0 */
145 hcd_to_ehci(hcd)->caps = hcd->regs;
146
147 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
148 if (retval)
149 goto err_put_hcd;
150
151 device_wakeup_enable(hcd->self.controller);
152 return retval;
153
154err_put_hcd:
155 usb_put_hcd(hcd);
156fail:
157 dev_err(&pdev->dev, "init fail, %d\n", retval);
158
159 return retval;
160}
161
162static int npcm7xx_ehci_hcd_drv_remove(struct platform_device *pdev)
163{
164 struct usb_hcd *hcd = platform_get_drvdata(pdev);
165
166 usb_remove_hcd(hcd);
167
168 usb_put_hcd(hcd);
169
170 return 0;
171}
172
173static const struct of_device_id npcm7xx_ehci_id_table[] = {
174 { .compatible = "nuvoton,npcm750-ehci" },
175 { },
176};
177MODULE_DEVICE_TABLE(of, npcm7xx_ehci_id_table);
178
179static 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,
188 }
189};
190
191static int __init ehci_npcm7xx_init(void)
192{
193 if (usb_disabled())
194 return -ENODEV;
195
196 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
197
198 ehci_init_driver(&ehci_npcm7xx_hc_driver, NULL);
199 return platform_driver_register(&npcm7xx_ehci_hcd_driver);
200}
201module_init(ehci_npcm7xx_init);
202
203static void __exit ehci_npcm7xx_cleanup(void)
204{
205 platform_driver_unregister(&npcm7xx_ehci_hcd_driver);
206}
207module_exit(ehci_npcm7xx_cleanup);
208
209MODULE_DESCRIPTION(DRIVER_DESC);
210MODULE_ALIAS("platform:npcm7xx-ehci");
211MODULE_AUTHOR("Avi Fishman");
212MODULE_LICENSE("GPL v2");