Commit | Line | Data |
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5fd54ace | 1 | // SPDX-License-Identifier: GPL-1.0+ |
da0e8fb0 VB |
2 | /* |
3 | * EHCI HCD (Host Controller Driver) for USB. | |
4 | * | |
5 | * Bus Glue for PPC On-Chip EHCI driver on the of_platform bus | |
6 | * Tested on AMCC PPC 440EPx | |
7 | * | |
8 | * Valentine Barshak <vbarshak@ru.mvista.com> | |
9 | * | |
10 | * Based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de> | |
11 | * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com> | |
12 | * | |
13 | * This file is licenced under the GPL. | |
14 | */ | |
15 | ||
148e1134 | 16 | #include <linux/err.h> |
da0e8fb0 VB |
17 | #include <linux/signal.h> |
18 | ||
19 | #include <linux/of.h> | |
5af50730 RH |
20 | #include <linux/of_address.h> |
21 | #include <linux/of_irq.h> | |
da0e8fb0 VB |
22 | #include <linux/of_platform.h> |
23 | ||
da0e8fb0 VB |
24 | |
25 | static const struct hc_driver ehci_ppc_of_hc_driver = { | |
26 | .description = hcd_name, | |
27 | .product_desc = "OF EHCI", | |
28 | .hcd_priv_size = sizeof(struct ehci_hcd), | |
29 | ||
30 | /* | |
31 | * generic hardware linkage | |
32 | */ | |
33 | .irq = ehci_irq, | |
7b81cb6b | 34 | .flags = HCD_MEMORY | HCD_DMA | HCD_USB2 | HCD_BH, |
da0e8fb0 VB |
35 | |
36 | /* | |
37 | * basic lifecycle operations | |
38 | */ | |
1a49e2ac | 39 | .reset = ehci_setup, |
da0e8fb0 VB |
40 | .start = ehci_run, |
41 | .stop = ehci_stop, | |
42 | .shutdown = ehci_shutdown, | |
43 | ||
44 | /* | |
45 | * managing i/o requests and associated device resources | |
46 | */ | |
47 | .urb_enqueue = ehci_urb_enqueue, | |
48 | .urb_dequeue = ehci_urb_dequeue, | |
49 | .endpoint_disable = ehci_endpoint_disable, | |
b18ffd49 | 50 | .endpoint_reset = ehci_endpoint_reset, |
da0e8fb0 VB |
51 | |
52 | /* | |
53 | * scheduling support | |
54 | */ | |
55 | .get_frame_number = ehci_get_frame, | |
56 | ||
57 | /* | |
58 | * root hub support | |
59 | */ | |
60 | .hub_status_data = ehci_hub_status_data, | |
61 | .hub_control = ehci_hub_control, | |
62 | #ifdef CONFIG_PM | |
63 | .bus_suspend = ehci_bus_suspend, | |
64 | .bus_resume = ehci_bus_resume, | |
65 | #endif | |
a8e51775 | 66 | .relinquish_port = ehci_relinquish_port, |
3a31155c | 67 | .port_handed_over = ehci_port_handed_over, |
914b7012 AS |
68 | |
69 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, | |
da0e8fb0 VB |
70 | }; |
71 | ||
72 | ||
73 | /* | |
74 | * 440EPx Errata USBH_3 | |
75 | * Fix: Enable Break Memory Transfer (BMT) in INSNREG3 | |
76 | */ | |
77 | #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0) | |
41ac7b3a | 78 | static int |
da0e8fb0 VB |
79 | ppc44x_enable_bmt(struct device_node *dn) |
80 | { | |
81 | __iomem u32 *insreg_virt; | |
82 | ||
83 | insreg_virt = of_iomap(dn, 1); | |
84 | if (!insreg_virt) | |
85 | return -EINVAL; | |
86 | ||
87 | out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT); | |
88 | ||
89 | iounmap(insreg_virt); | |
90 | return 0; | |
91 | } | |
92 | ||
93 | ||
41ac7b3a | 94 | static int ehci_hcd_ppc_of_probe(struct platform_device *op) |
da0e8fb0 | 95 | { |
61c7a080 | 96 | struct device_node *dn = op->dev.of_node; |
da0e8fb0 | 97 | struct usb_hcd *hcd; |
796bcae7 | 98 | struct ehci_hcd *ehci = NULL; |
da0e8fb0 VB |
99 | struct resource res; |
100 | int irq; | |
101 | int rv; | |
102 | ||
796bcae7 VB |
103 | struct device_node *np; |
104 | ||
da0e8fb0 VB |
105 | if (usb_disabled()) |
106 | return -ENODEV; | |
107 | ||
108 | dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n"); | |
109 | ||
110 | rv = of_address_to_resource(dn, 0, &res); | |
111 | if (rv) | |
112 | return rv; | |
113 | ||
114 | hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); | |
115 | if (!hcd) | |
116 | return -ENOMEM; | |
117 | ||
118 | hcd->rsrc_start = res.start; | |
28f65c11 | 119 | hcd->rsrc_len = resource_size(&res); |
da0e8fb0 | 120 | |
da0e8fb0 VB |
121 | irq = irq_of_parse_and_map(dn, 0); |
122 | if (irq == NO_IRQ) { | |
346c8b24 JH |
123 | dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n", |
124 | __FILE__); | |
da0e8fb0 VB |
125 | rv = -EBUSY; |
126 | goto err_irq; | |
127 | } | |
128 | ||
148e1134 TR |
129 | hcd->regs = devm_ioremap_resource(&op->dev, &res); |
130 | if (IS_ERR(hcd->regs)) { | |
131 | rv = PTR_ERR(hcd->regs); | |
da0e8fb0 VB |
132 | goto err_ioremap; |
133 | } | |
134 | ||
135 | ehci = hcd_to_ehci(hcd); | |
796bcae7 VB |
136 | np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx"); |
137 | if (np != NULL) { | |
138 | /* claim we really affected by usb23 erratum */ | |
139 | if (!of_address_to_resource(np, 0, &res)) | |
1c5404f7 JL |
140 | ehci->ohci_hcctrl_reg = |
141 | devm_ioremap(&op->dev, | |
142 | res.start + OHCI_HCCTRL_OFFSET, | |
143 | OHCI_HCCTRL_LEN); | |
796bcae7 | 144 | else |
f45ba776 | 145 | pr_debug("%s: no ohci offset in fdt\n", __FILE__); |
796bcae7 | 146 | if (!ehci->ohci_hcctrl_reg) { |
f45ba776 | 147 | pr_debug("%s: ioremap for ohci hcctrl failed\n", __FILE__); |
796bcae7 VB |
148 | } else { |
149 | ehci->has_amcc_usb23 = 1; | |
150 | } | |
151 | } | |
da0e8fb0 VB |
152 | |
153 | if (of_get_property(dn, "big-endian", NULL)) { | |
154 | ehci->big_endian_mmio = 1; | |
155 | ehci->big_endian_desc = 1; | |
156 | } | |
157 | if (of_get_property(dn, "big-endian-regs", NULL)) | |
158 | ehci->big_endian_mmio = 1; | |
159 | if (of_get_property(dn, "big-endian-desc", NULL)) | |
160 | ehci->big_endian_desc = 1; | |
161 | ||
162 | ehci->caps = hcd->regs; | |
da0e8fb0 VB |
163 | |
164 | if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) { | |
165 | rv = ppc44x_enable_bmt(dn); | |
166 | ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n", | |
167 | rv ? "NOT ": ""); | |
168 | } | |
169 | ||
170 | rv = usb_add_hcd(hcd, irq, 0); | |
08a3b3b1 | 171 | if (rv) |
1c5404f7 | 172 | goto err_ioremap; |
08a3b3b1 | 173 | |
3c9740a1 | 174 | device_wakeup_enable(hcd->self.controller); |
08a3b3b1 | 175 | return 0; |
da0e8fb0 | 176 | |
da0e8fb0 VB |
177 | err_ioremap: |
178 | irq_dispose_mapping(irq); | |
179 | err_irq: | |
da0e8fb0 VB |
180 | usb_put_hcd(hcd); |
181 | ||
182 | return rv; | |
183 | } | |
184 | ||
185 | ||
2dc11581 | 186 | static int ehci_hcd_ppc_of_remove(struct platform_device *op) |
da0e8fb0 | 187 | { |
477527ba | 188 | struct usb_hcd *hcd = platform_get_drvdata(op); |
796bcae7 VB |
189 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
190 | ||
191 | struct device_node *np; | |
192 | struct resource res; | |
193 | ||
da0e8fb0 VB |
194 | dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); |
195 | ||
196 | usb_remove_hcd(hcd); | |
197 | ||
da0e8fb0 | 198 | irq_dispose_mapping(hcd->irq); |
da0e8fb0 | 199 | |
796bcae7 VB |
200 | /* use request_mem_region to test if the ohci driver is loaded. if so |
201 | * ensure the ohci core is operational. | |
202 | */ | |
203 | if (ehci->has_amcc_usb23) { | |
204 | np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx"); | |
205 | if (np != NULL) { | |
206 | if (!of_address_to_resource(np, 0, &res)) | |
207 | if (!request_mem_region(res.start, | |
208 | 0x4, hcd_name)) | |
209 | set_ohci_hcfs(ehci, 1); | |
210 | else | |
211 | release_mem_region(res.start, 0x4); | |
212 | else | |
f45ba776 | 213 | pr_debug("%s: no ohci offset in fdt\n", __FILE__); |
796bcae7 VB |
214 | of_node_put(np); |
215 | } | |
796bcae7 | 216 | } |
da0e8fb0 VB |
217 | usb_put_hcd(hcd); |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | ||
c4386ad0 | 223 | static const struct of_device_id ehci_hcd_ppc_of_match[] = { |
da0e8fb0 VB |
224 | { |
225 | .compatible = "usb-ehci", | |
226 | }, | |
227 | {}, | |
228 | }; | |
229 | MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); | |
230 | ||
231 | ||
d35fb641 | 232 | static struct platform_driver ehci_hcd_ppc_of_driver = { |
da0e8fb0 VB |
233 | .probe = ehci_hcd_ppc_of_probe, |
234 | .remove = ehci_hcd_ppc_of_remove, | |
aaf6b52d | 235 | .shutdown = usb_hcd_platform_shutdown, |
4018294b GL |
236 | .driver = { |
237 | .name = "ppc-of-ehci", | |
4018294b | 238 | .of_match_table = ehci_hcd_ppc_of_match, |
da0e8fb0 VB |
239 | }, |
240 | }; |