1 /* 2 * Driver for Aeroflex Gaisler GRLIB GRUSBHC EHCI host controller 3 * 4 * GRUSBHC is typically found on LEON/GRLIB SoCs 5 * 6 * (c) Jan Andersson <jan@gaisler.com> 7 * 8 * Based on ehci-ppc-of.c which is: 9 * (c) Valentine Barshak <vbarshak@ru.mvista.com> 10 * and in turn 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 program is free software; you can redistribute it and/or modify it 14 * under the terms of the GNU General Public License as published by the 15 * Free Software Foundation; either version 2 of the License, or (at your 16 * option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, but 19 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 20 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 21 * for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software Foundation, 25 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 26 */ 27 28 29 #include <linux/signal.h> 30 31 #include <linux/of_irq.h> 32 #include <linux/of_address.h> 33 #include <linux/of_platform.h> 34 35 #define GRUSBHC_HCIVERSION 0x0100 /* Known value of cap. reg. HCIVERSION */ 36 37 /* called during probe() after chip reset completes */ 38 static int ehci_grlib_setup(struct usb_hcd *hcd) 39 { 40 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 41 int retval; 42 43 retval = ehci_halt(ehci); 44 if (retval) 45 return retval; 46 47 retval = ehci_init(hcd); 48 if (retval) 49 return retval; 50 51 ehci->sbrn = 0x20; 52 ehci_port_power(ehci, 1); 53 54 return ehci_reset(ehci); 55 } 56 57 58 static const struct hc_driver ehci_grlib_hc_driver = { 59 .description = hcd_name, 60 .product_desc = "GRLIB GRUSBHC EHCI", 61 .hcd_priv_size = sizeof(struct ehci_hcd), 62 63 /* 64 * generic hardware linkage 65 */ 66 .irq = ehci_irq, 67 .flags = HCD_MEMORY | HCD_USB2, 68 69 /* 70 * basic lifecycle operations 71 */ 72 .reset = ehci_grlib_setup, 73 .start = ehci_run, 74 .stop = ehci_stop, 75 .shutdown = ehci_shutdown, 76 77 /* 78 * managing i/o requests and associated device resources 79 */ 80 .urb_enqueue = ehci_urb_enqueue, 81 .urb_dequeue = ehci_urb_dequeue, 82 .endpoint_disable = ehci_endpoint_disable, 83 .endpoint_reset = ehci_endpoint_reset, 84 85 /* 86 * scheduling support 87 */ 88 .get_frame_number = ehci_get_frame, 89 90 /* 91 * root hub support 92 */ 93 .hub_status_data = ehci_hub_status_data, 94 .hub_control = ehci_hub_control, 95 #ifdef CONFIG_PM 96 .bus_suspend = ehci_bus_suspend, 97 .bus_resume = ehci_bus_resume, 98 #endif 99 .relinquish_port = ehci_relinquish_port, 100 .port_handed_over = ehci_port_handed_over, 101 102 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 103 }; 104 105 106 static int __devinit ehci_hcd_grlib_probe(struct platform_device *op) 107 { 108 struct device_node *dn = op->dev.of_node; 109 struct usb_hcd *hcd; 110 struct ehci_hcd *ehci = NULL; 111 struct resource res; 112 u32 hc_capbase; 113 int irq; 114 int rv; 115 116 if (usb_disabled()) 117 return -ENODEV; 118 119 dev_dbg(&op->dev, "initializing GRUSBHC EHCI USB Controller\n"); 120 121 rv = of_address_to_resource(dn, 0, &res); 122 if (rv) 123 return rv; 124 125 /* usb_create_hcd requires dma_mask != NULL */ 126 op->dev.dma_mask = &op->dev.coherent_dma_mask; 127 hcd = usb_create_hcd(&ehci_grlib_hc_driver, &op->dev, 128 "GRUSBHC EHCI USB"); 129 if (!hcd) 130 return -ENOMEM; 131 132 hcd->rsrc_start = res.start; 133 hcd->rsrc_len = resource_size(&res); 134 135 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 136 printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__); 137 rv = -EBUSY; 138 goto err_rmr; 139 } 140 141 irq = irq_of_parse_and_map(dn, 0); 142 if (irq == NO_IRQ) { 143 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__); 144 rv = -EBUSY; 145 goto err_irq; 146 } 147 148 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 149 if (!hcd->regs) { 150 printk(KERN_ERR "%s: ioremap failed\n", __FILE__); 151 rv = -ENOMEM; 152 goto err_ioremap; 153 } 154 155 ehci = hcd_to_ehci(hcd); 156 157 ehci->caps = hcd->regs; 158 159 /* determine endianness of this implementation */ 160 hc_capbase = ehci_readl(ehci, &ehci->caps->hc_capbase); 161 if (HC_VERSION(ehci, hc_capbase) != GRUSBHC_HCIVERSION) { 162 ehci->big_endian_mmio = 1; 163 ehci->big_endian_desc = 1; 164 ehci->big_endian_capbase = 1; 165 } 166 167 ehci->regs = hcd->regs + 168 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase)); 169 170 /* cache this readonly data; minimize chip reads */ 171 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); 172 173 rv = usb_add_hcd(hcd, irq, 0); 174 if (rv) 175 goto err_ehci; 176 177 return 0; 178 179 err_ehci: 180 iounmap(hcd->regs); 181 err_ioremap: 182 irq_dispose_mapping(irq); 183 err_irq: 184 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 185 err_rmr: 186 usb_put_hcd(hcd); 187 188 return rv; 189 } 190 191 192 static int ehci_hcd_grlib_remove(struct platform_device *op) 193 { 194 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 195 196 dev_set_drvdata(&op->dev, NULL); 197 198 dev_dbg(&op->dev, "stopping GRLIB GRUSBHC EHCI USB Controller\n"); 199 200 usb_remove_hcd(hcd); 201 202 iounmap(hcd->regs); 203 irq_dispose_mapping(hcd->irq); 204 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 205 206 usb_put_hcd(hcd); 207 208 return 0; 209 } 210 211 212 static void ehci_hcd_grlib_shutdown(struct platform_device *op) 213 { 214 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 215 216 if (hcd->driver->shutdown) 217 hcd->driver->shutdown(hcd); 218 } 219 220 221 static const struct of_device_id ehci_hcd_grlib_of_match[] = { 222 { 223 .name = "GAISLER_EHCI", 224 }, 225 { 226 .name = "01_026", 227 }, 228 {}, 229 }; 230 MODULE_DEVICE_TABLE(of, ehci_hcd_grlib_of_match); 231 232 233 static struct platform_driver ehci_grlib_driver = { 234 .probe = ehci_hcd_grlib_probe, 235 .remove = ehci_hcd_grlib_remove, 236 .shutdown = ehci_hcd_grlib_shutdown, 237 .driver = { 238 .name = "grlib-ehci", 239 .owner = THIS_MODULE, 240 .of_match_table = ehci_hcd_grlib_of_match, 241 }, 242 }; 243