Valentine Barshak | da0e8fb | 2007-12-30 15:28:50 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * EHCI HCD (Host Controller Driver) for USB. |
| 3 | * |
| 4 | * Bus Glue for PPC On-Chip EHCI driver on the of_platform bus |
| 5 | * Tested on AMCC PPC 440EPx |
| 6 | * |
| 7 | * Valentine Barshak <vbarshak@ru.mvista.com> |
| 8 | * |
| 9 | * Based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de> |
| 10 | * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com> |
| 11 | * |
| 12 | * This file is licenced under the GPL. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/signal.h> |
| 16 | |
| 17 | #include <linux/of.h> |
| 18 | #include <linux/of_platform.h> |
| 19 | |
| 20 | /* called during probe() after chip reset completes */ |
| 21 | static int ehci_ppc_of_setup(struct usb_hcd *hcd) |
| 22 | { |
| 23 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
| 24 | int retval; |
| 25 | |
| 26 | retval = ehci_halt(ehci); |
| 27 | if (retval) |
| 28 | return retval; |
| 29 | |
| 30 | retval = ehci_init(hcd); |
| 31 | if (retval) |
| 32 | return retval; |
| 33 | |
| 34 | ehci->sbrn = 0x20; |
| 35 | return ehci_reset(ehci); |
| 36 | } |
| 37 | |
| 38 | |
| 39 | static const struct hc_driver ehci_ppc_of_hc_driver = { |
| 40 | .description = hcd_name, |
| 41 | .product_desc = "OF EHCI", |
| 42 | .hcd_priv_size = sizeof(struct ehci_hcd), |
| 43 | |
| 44 | /* |
| 45 | * generic hardware linkage |
| 46 | */ |
| 47 | .irq = ehci_irq, |
| 48 | .flags = HCD_MEMORY | HCD_USB2, |
| 49 | |
| 50 | /* |
| 51 | * basic lifecycle operations |
| 52 | */ |
| 53 | .reset = ehci_ppc_of_setup, |
| 54 | .start = ehci_run, |
| 55 | .stop = ehci_stop, |
| 56 | .shutdown = ehci_shutdown, |
| 57 | |
| 58 | /* |
| 59 | * managing i/o requests and associated device resources |
| 60 | */ |
| 61 | .urb_enqueue = ehci_urb_enqueue, |
| 62 | .urb_dequeue = ehci_urb_dequeue, |
| 63 | .endpoint_disable = ehci_endpoint_disable, |
| 64 | |
| 65 | /* |
| 66 | * scheduling support |
| 67 | */ |
| 68 | .get_frame_number = ehci_get_frame, |
| 69 | |
| 70 | /* |
| 71 | * root hub support |
| 72 | */ |
| 73 | .hub_status_data = ehci_hub_status_data, |
| 74 | .hub_control = ehci_hub_control, |
| 75 | #ifdef CONFIG_PM |
| 76 | .bus_suspend = ehci_bus_suspend, |
| 77 | .bus_resume = ehci_bus_resume, |
| 78 | #endif |
| 79 | }; |
| 80 | |
| 81 | |
| 82 | /* |
| 83 | * 440EPx Errata USBH_3 |
| 84 | * Fix: Enable Break Memory Transfer (BMT) in INSNREG3 |
| 85 | */ |
| 86 | #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0) |
| 87 | static int __devinit |
| 88 | ppc44x_enable_bmt(struct device_node *dn) |
| 89 | { |
| 90 | __iomem u32 *insreg_virt; |
| 91 | |
| 92 | insreg_virt = of_iomap(dn, 1); |
| 93 | if (!insreg_virt) |
| 94 | return -EINVAL; |
| 95 | |
| 96 | out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT); |
| 97 | |
| 98 | iounmap(insreg_virt); |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | |
| 103 | static int __devinit |
| 104 | ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match) |
| 105 | { |
| 106 | struct device_node *dn = op->node; |
| 107 | struct usb_hcd *hcd; |
| 108 | struct ehci_hcd *ehci; |
| 109 | struct resource res; |
| 110 | int irq; |
| 111 | int rv; |
| 112 | |
| 113 | if (usb_disabled()) |
| 114 | return -ENODEV; |
| 115 | |
| 116 | dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n"); |
| 117 | |
| 118 | rv = of_address_to_resource(dn, 0, &res); |
| 119 | if (rv) |
| 120 | return rv; |
| 121 | |
| 122 | hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); |
| 123 | if (!hcd) |
| 124 | return -ENOMEM; |
| 125 | |
| 126 | hcd->rsrc_start = res.start; |
| 127 | hcd->rsrc_len = res.end - res.start + 1; |
| 128 | |
| 129 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { |
| 130 | printk(KERN_ERR __FILE__ ": request_mem_region failed\n"); |
| 131 | rv = -EBUSY; |
| 132 | goto err_rmr; |
| 133 | } |
| 134 | |
| 135 | irq = irq_of_parse_and_map(dn, 0); |
| 136 | if (irq == NO_IRQ) { |
| 137 | printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n"); |
| 138 | rv = -EBUSY; |
| 139 | goto err_irq; |
| 140 | } |
| 141 | |
| 142 | hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); |
| 143 | if (!hcd->regs) { |
| 144 | printk(KERN_ERR __FILE__ ": ioremap failed\n"); |
| 145 | rv = -ENOMEM; |
| 146 | goto err_ioremap; |
| 147 | } |
| 148 | |
| 149 | ehci = hcd_to_ehci(hcd); |
| 150 | |
| 151 | if (of_get_property(dn, "big-endian", NULL)) { |
| 152 | ehci->big_endian_mmio = 1; |
| 153 | ehci->big_endian_desc = 1; |
| 154 | } |
| 155 | if (of_get_property(dn, "big-endian-regs", NULL)) |
| 156 | ehci->big_endian_mmio = 1; |
| 157 | if (of_get_property(dn, "big-endian-desc", NULL)) |
| 158 | ehci->big_endian_desc = 1; |
| 159 | |
| 160 | ehci->caps = hcd->regs; |
| 161 | ehci->regs = hcd->regs + |
| 162 | HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase)); |
| 163 | |
| 164 | /* cache this readonly data; minimize chip reads */ |
| 165 | ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); |
| 166 | |
| 167 | if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) { |
| 168 | rv = ppc44x_enable_bmt(dn); |
| 169 | ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n", |
| 170 | rv ? "NOT ": ""); |
| 171 | } |
| 172 | |
| 173 | rv = usb_add_hcd(hcd, irq, 0); |
| 174 | if (rv == 0) |
| 175 | return 0; |
| 176 | |
| 177 | iounmap(hcd->regs); |
| 178 | err_ioremap: |
| 179 | irq_dispose_mapping(irq); |
| 180 | err_irq: |
| 181 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
| 182 | err_rmr: |
| 183 | usb_put_hcd(hcd); |
| 184 | |
| 185 | return rv; |
| 186 | } |
| 187 | |
| 188 | |
| 189 | static int ehci_hcd_ppc_of_remove(struct of_device *op) |
| 190 | { |
| 191 | struct usb_hcd *hcd = dev_get_drvdata(&op->dev); |
| 192 | dev_set_drvdata(&op->dev, NULL); |
| 193 | |
| 194 | dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); |
| 195 | |
| 196 | usb_remove_hcd(hcd); |
| 197 | |
| 198 | iounmap(hcd->regs); |
| 199 | irq_dispose_mapping(hcd->irq); |
| 200 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
| 201 | |
| 202 | usb_put_hcd(hcd); |
| 203 | |
| 204 | return 0; |
| 205 | } |
| 206 | |
| 207 | |
| 208 | static int ehci_hcd_ppc_of_shutdown(struct of_device *op) |
| 209 | { |
| 210 | struct usb_hcd *hcd = dev_get_drvdata(&op->dev); |
| 211 | |
| 212 | if (hcd->driver->shutdown) |
| 213 | hcd->driver->shutdown(hcd); |
| 214 | |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | |
| 219 | static struct of_device_id ehci_hcd_ppc_of_match[] = { |
| 220 | { |
| 221 | .compatible = "usb-ehci", |
| 222 | }, |
| 223 | {}, |
| 224 | }; |
| 225 | MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); |
| 226 | |
| 227 | |
| 228 | static struct of_platform_driver ehci_hcd_ppc_of_driver = { |
| 229 | .name = "ppc-of-ehci", |
| 230 | .match_table = ehci_hcd_ppc_of_match, |
| 231 | .probe = ehci_hcd_ppc_of_probe, |
| 232 | .remove = ehci_hcd_ppc_of_remove, |
| 233 | .shutdown = ehci_hcd_ppc_of_shutdown, |
| 234 | .driver = { |
| 235 | .name = "ppc-of-ehci", |
| 236 | .owner = THIS_MODULE, |
| 237 | }, |
| 238 | }; |