1 | // SPDX-License-Identifier: GPL-1.0+ |
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 | |
16 | #include <linux/err.h> |
17 | #include <linux/signal.h> |
18 | |
19 | #include <linux/of.h> |
20 | #include <linux/of_address.h> |
21 | #include <linux/of_irq.h> |
22 | #include <linux/of_platform.h> |
23 | |
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, |
34 | .flags = HCD_MEMORY | HCD_DMA | HCD_USB2 | HCD_BH, |
35 | |
36 | /* |
37 | * basic lifecycle operations |
38 | */ |
39 | .reset = ehci_setup, |
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, |
50 | .endpoint_reset = ehci_endpoint_reset, |
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 |
66 | .relinquish_port = ehci_relinquish_port, |
67 | .port_handed_over = ehci_port_handed_over, |
68 | |
69 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, |
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) |
78 | static int |
79 | ppc44x_enable_bmt(struct device_node *dn) |
80 | { |
81 | __iomem u32 *insreg_virt; |
82 | |
83 | insreg_virt = of_iomap(node: dn, index: 1); |
84 | if (!insreg_virt) |
85 | return -EINVAL; |
86 | |
87 | out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT); |
88 | |
89 | iounmap(addr: insreg_virt); |
90 | return 0; |
91 | } |
92 | |
93 | |
94 | static int ehci_hcd_ppc_of_probe(struct platform_device *op) |
95 | { |
96 | struct device_node *dn = op->dev.of_node; |
97 | struct usb_hcd *hcd; |
98 | struct ehci_hcd *ehci = NULL; |
99 | struct resource res; |
100 | int irq; |
101 | int rv; |
102 | |
103 | struct device_node *np; |
104 | |
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(dev: dn, index: 0, r: &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; |
119 | hcd->rsrc_len = resource_size(res: &res); |
120 | |
121 | irq = irq_of_parse_and_map(node: dn, index: 0); |
122 | if (!irq) { |
123 | dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n" , |
124 | __FILE__); |
125 | rv = -EBUSY; |
126 | goto err_irq; |
127 | } |
128 | |
129 | hcd->regs = devm_ioremap_resource(dev: &op->dev, res: &res); |
130 | if (IS_ERR(ptr: hcd->regs)) { |
131 | rv = PTR_ERR(ptr: hcd->regs); |
132 | goto err_ioremap; |
133 | } |
134 | |
135 | ehci = hcd_to_ehci(hcd); |
136 | np = of_find_compatible_node(NULL, NULL, compat: "ibm,usb-ohci-440epx" ); |
137 | if (np != NULL) { |
138 | /* claim we really affected by usb23 erratum */ |
139 | if (!of_address_to_resource(dev: np, index: 0, r: &res)) |
140 | ehci->ohci_hcctrl_reg = |
141 | devm_ioremap(dev: &op->dev, |
142 | offset: res.start + OHCI_HCCTRL_OFFSET, |
143 | size: OHCI_HCCTRL_LEN); |
144 | else |
145 | pr_debug("%s: no ohci offset in fdt\n" , __FILE__); |
146 | if (!ehci->ohci_hcctrl_reg) { |
147 | pr_debug("%s: ioremap for ohci hcctrl failed\n" , __FILE__); |
148 | } else { |
149 | ehci->has_amcc_usb23 = 1; |
150 | } |
151 | of_node_put(node: np); |
152 | } |
153 | |
154 | if (of_property_read_bool(np: dn, propname: "big-endian" )) { |
155 | ehci->big_endian_mmio = 1; |
156 | ehci->big_endian_desc = 1; |
157 | } |
158 | if (of_property_read_bool(np: dn, propname: "big-endian-regs" )) |
159 | ehci->big_endian_mmio = 1; |
160 | if (of_property_read_bool(np: dn, propname: "big-endian-desc" )) |
161 | ehci->big_endian_desc = 1; |
162 | |
163 | ehci->caps = hcd->regs; |
164 | |
165 | if (of_device_is_compatible(device: dn, "ibm,usb-ehci-440epx" )) { |
166 | rv = ppc44x_enable_bmt(dn); |
167 | ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n" , |
168 | rv ? "NOT " : "" ); |
169 | } |
170 | |
171 | rv = usb_add_hcd(hcd, irq, 0); |
172 | if (rv) |
173 | goto err_ioremap; |
174 | |
175 | device_wakeup_enable(dev: hcd->self.controller); |
176 | return 0; |
177 | |
178 | err_ioremap: |
179 | irq_dispose_mapping(virq: irq); |
180 | err_irq: |
181 | usb_put_hcd(hcd); |
182 | |
183 | return rv; |
184 | } |
185 | |
186 | |
187 | static void ehci_hcd_ppc_of_remove(struct platform_device *op) |
188 | { |
189 | struct usb_hcd *hcd = platform_get_drvdata(pdev: op); |
190 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
191 | |
192 | struct device_node *np; |
193 | struct resource res; |
194 | |
195 | dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n" ); |
196 | |
197 | usb_remove_hcd(hcd); |
198 | |
199 | irq_dispose_mapping(virq: hcd->irq); |
200 | |
201 | /* use request_mem_region to test if the ohci driver is loaded. if so |
202 | * ensure the ohci core is operational. |
203 | */ |
204 | if (ehci->has_amcc_usb23) { |
205 | np = of_find_compatible_node(NULL, NULL, compat: "ibm,usb-ohci-440epx" ); |
206 | if (np != NULL) { |
207 | if (!of_address_to_resource(dev: np, index: 0, r: &res)) |
208 | if (!request_mem_region(res.start, |
209 | 0x4, hcd_name)) |
210 | set_ohci_hcfs(ehci, 1); |
211 | else |
212 | release_mem_region(res.start, 0x4); |
213 | else |
214 | pr_debug("%s: no ohci offset in fdt\n" , __FILE__); |
215 | of_node_put(node: np); |
216 | } |
217 | } |
218 | usb_put_hcd(hcd); |
219 | } |
220 | |
221 | |
222 | static const struct of_device_id ehci_hcd_ppc_of_match[] = { |
223 | { |
224 | .compatible = "usb-ehci" , |
225 | }, |
226 | {}, |
227 | }; |
228 | MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); |
229 | |
230 | |
231 | static struct platform_driver ehci_hcd_ppc_of_driver = { |
232 | .probe = ehci_hcd_ppc_of_probe, |
233 | .remove_new = ehci_hcd_ppc_of_remove, |
234 | .shutdown = usb_hcd_platform_shutdown, |
235 | .driver = { |
236 | .name = "ppc-of-ehci" , |
237 | .of_match_table = ehci_hcd_ppc_of_match, |
238 | }, |
239 | }; |
240 | |