1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * Driver for Aeroflex Gaisler GRLIB GRUSBHC EHCI host controller |
4 | * |
5 | * GRUSBHC is typically found on LEON/GRLIB SoCs |
6 | * |
7 | * (c) Jan Andersson <jan@gaisler.com> |
8 | * |
9 | * Based on ehci-ppc-of.c which is: |
10 | * (c) Valentine Barshak <vbarshak@ru.mvista.com> |
11 | * and in turn based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de> |
12 | * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com> |
13 | */ |
14 | |
15 | #include <linux/err.h> |
16 | #include <linux/signal.h> |
17 | |
18 | #include <linux/of_irq.h> |
19 | #include <linux/of_address.h> |
20 | #include <linux/of_platform.h> |
21 | |
22 | #define GRUSBHC_HCIVERSION 0x0100 /* Known value of cap. reg. HCIVERSION */ |
23 | |
24 | static const struct hc_driver ehci_grlib_hc_driver = { |
25 | .description = hcd_name, |
26 | .product_desc = "GRLIB GRUSBHC EHCI" , |
27 | .hcd_priv_size = sizeof(struct ehci_hcd), |
28 | |
29 | /* |
30 | * generic hardware linkage |
31 | */ |
32 | .irq = ehci_irq, |
33 | .flags = HCD_MEMORY | HCD_DMA | HCD_USB2 | HCD_BH, |
34 | |
35 | /* |
36 | * basic lifecycle operations |
37 | */ |
38 | .reset = ehci_setup, |
39 | .start = ehci_run, |
40 | .stop = ehci_stop, |
41 | .shutdown = ehci_shutdown, |
42 | |
43 | /* |
44 | * managing i/o requests and associated device resources |
45 | */ |
46 | .urb_enqueue = ehci_urb_enqueue, |
47 | .urb_dequeue = ehci_urb_dequeue, |
48 | .endpoint_disable = ehci_endpoint_disable, |
49 | .endpoint_reset = ehci_endpoint_reset, |
50 | |
51 | /* |
52 | * scheduling support |
53 | */ |
54 | .get_frame_number = ehci_get_frame, |
55 | |
56 | /* |
57 | * root hub support |
58 | */ |
59 | .hub_status_data = ehci_hub_status_data, |
60 | .hub_control = ehci_hub_control, |
61 | #ifdef CONFIG_PM |
62 | .bus_suspend = ehci_bus_suspend, |
63 | .bus_resume = ehci_bus_resume, |
64 | #endif |
65 | .relinquish_port = ehci_relinquish_port, |
66 | .port_handed_over = ehci_port_handed_over, |
67 | |
68 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, |
69 | }; |
70 | |
71 | |
72 | static int ehci_hcd_grlib_probe(struct platform_device *op) |
73 | { |
74 | struct device_node *dn = op->dev.of_node; |
75 | struct usb_hcd *hcd; |
76 | struct ehci_hcd *ehci = NULL; |
77 | struct resource res; |
78 | u32 hc_capbase; |
79 | int irq; |
80 | int rv; |
81 | |
82 | if (usb_disabled()) |
83 | return -ENODEV; |
84 | |
85 | dev_dbg(&op->dev, "initializing GRUSBHC EHCI USB Controller\n" ); |
86 | |
87 | rv = of_address_to_resource(dev: dn, index: 0, r: &res); |
88 | if (rv) |
89 | return rv; |
90 | |
91 | /* usb_create_hcd requires dma_mask != NULL */ |
92 | op->dev.dma_mask = &op->dev.coherent_dma_mask; |
93 | hcd = usb_create_hcd(&ehci_grlib_hc_driver, &op->dev, |
94 | "GRUSBHC EHCI USB" ); |
95 | if (!hcd) |
96 | return -ENOMEM; |
97 | |
98 | hcd->rsrc_start = res.start; |
99 | hcd->rsrc_len = resource_size(res: &res); |
100 | |
101 | irq = irq_of_parse_and_map(node: dn, index: 0); |
102 | if (!irq) { |
103 | dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n" , |
104 | __FILE__); |
105 | rv = -EBUSY; |
106 | goto err_irq; |
107 | } |
108 | |
109 | hcd->regs = devm_ioremap_resource(dev: &op->dev, res: &res); |
110 | if (IS_ERR(ptr: hcd->regs)) { |
111 | rv = PTR_ERR(ptr: hcd->regs); |
112 | goto err_ioremap; |
113 | } |
114 | |
115 | ehci = hcd_to_ehci(hcd); |
116 | |
117 | ehci->caps = hcd->regs; |
118 | |
119 | /* determine endianness of this implementation */ |
120 | hc_capbase = ehci_readl(ehci, &ehci->caps->hc_capbase); |
121 | if (HC_VERSION(ehci, hc_capbase) != GRUSBHC_HCIVERSION) { |
122 | ehci->big_endian_mmio = 1; |
123 | ehci->big_endian_desc = 1; |
124 | ehci->big_endian_capbase = 1; |
125 | } |
126 | |
127 | rv = usb_add_hcd(hcd, irq, 0); |
128 | if (rv) |
129 | goto err_ioremap; |
130 | |
131 | device_wakeup_enable(dev: hcd->self.controller); |
132 | return 0; |
133 | |
134 | err_ioremap: |
135 | irq_dispose_mapping(virq: irq); |
136 | err_irq: |
137 | usb_put_hcd(hcd); |
138 | |
139 | return rv; |
140 | } |
141 | |
142 | |
143 | static void ehci_hcd_grlib_remove(struct platform_device *op) |
144 | { |
145 | struct usb_hcd *hcd = platform_get_drvdata(pdev: op); |
146 | |
147 | dev_dbg(&op->dev, "stopping GRLIB GRUSBHC EHCI USB Controller\n" ); |
148 | |
149 | usb_remove_hcd(hcd); |
150 | |
151 | irq_dispose_mapping(virq: hcd->irq); |
152 | |
153 | usb_put_hcd(hcd); |
154 | } |
155 | |
156 | |
157 | static const struct of_device_id ehci_hcd_grlib_of_match[] = { |
158 | { |
159 | .name = "GAISLER_EHCI" , |
160 | }, |
161 | { |
162 | .name = "01_026" , |
163 | }, |
164 | {}, |
165 | }; |
166 | MODULE_DEVICE_TABLE(of, ehci_hcd_grlib_of_match); |
167 | |
168 | |
169 | static struct platform_driver ehci_grlib_driver = { |
170 | .probe = ehci_hcd_grlib_probe, |
171 | .remove_new = ehci_hcd_grlib_remove, |
172 | .shutdown = usb_hcd_platform_shutdown, |
173 | .driver = { |
174 | .name = "grlib-ehci" , |
175 | .of_match_table = ehci_hcd_grlib_of_match, |
176 | }, |
177 | }; |
178 | |