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 #include <linux/err.h> 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 static const struct hc_driver ehci_grlib_hc_driver = { 38 .description = hcd_name, 39 .product_desc = "GRLIB GRUSBHC EHCI", 40 .hcd_priv_size = sizeof(struct ehci_hcd), 41 42 /* 43 * generic hardware linkage 44 */ 45 .irq = ehci_irq, 46 .flags = HCD_MEMORY | HCD_USB2 | HCD_BH, 47 48 /* 49 * basic lifecycle operations 50 */ 51 .reset = ehci_setup, 52 .start = ehci_run, 53 .stop = ehci_stop, 54 .shutdown = ehci_shutdown, 55 56 /* 57 * managing i/o requests and associated device resources 58 */ 59 .urb_enqueue = ehci_urb_enqueue, 60 .urb_dequeue = ehci_urb_dequeue, 61 .endpoint_disable = ehci_endpoint_disable, 62 .endpoint_reset = ehci_endpoint_reset, 63 64 /* 65 * scheduling support 66 */ 67 .get_frame_number = ehci_get_frame, 68 69 /* 70 * root hub support 71 */ 72 .hub_status_data = ehci_hub_status_data, 73 .hub_control = ehci_hub_control, 74 #ifdef CONFIG_PM 75 .bus_suspend = ehci_bus_suspend, 76 .bus_resume = ehci_bus_resume, 77 #endif 78 .relinquish_port = ehci_relinquish_port, 79 .port_handed_over = ehci_port_handed_over, 80 81 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 82 }; 83 84 85 static int ehci_hcd_grlib_probe(struct platform_device *op) 86 { 87 struct device_node *dn = op->dev.of_node; 88 struct usb_hcd *hcd; 89 struct ehci_hcd *ehci = NULL; 90 struct resource res; 91 u32 hc_capbase; 92 int irq; 93 int rv; 94 95 if (usb_disabled()) 96 return -ENODEV; 97 98 dev_dbg(&op->dev, "initializing GRUSBHC EHCI USB Controller\n"); 99 100 rv = of_address_to_resource(dn, 0, &res); 101 if (rv) 102 return rv; 103 104 /* usb_create_hcd requires dma_mask != NULL */ 105 op->dev.dma_mask = &op->dev.coherent_dma_mask; 106 hcd = usb_create_hcd(&ehci_grlib_hc_driver, &op->dev, 107 "GRUSBHC EHCI USB"); 108 if (!hcd) 109 return -ENOMEM; 110 111 hcd->rsrc_start = res.start; 112 hcd->rsrc_len = resource_size(&res); 113 114 irq = irq_of_parse_and_map(dn, 0); 115 if (irq == NO_IRQ) { 116 dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n", 117 __FILE__); 118 rv = -EBUSY; 119 goto err_irq; 120 } 121 122 hcd->regs = devm_ioremap_resource(&op->dev, &res); 123 if (IS_ERR(hcd->regs)) { 124 rv = PTR_ERR(hcd->regs); 125 goto err_ioremap; 126 } 127 128 ehci = hcd_to_ehci(hcd); 129 130 ehci->caps = hcd->regs; 131 132 /* determine endianness of this implementation */ 133 hc_capbase = ehci_readl(ehci, &ehci->caps->hc_capbase); 134 if (HC_VERSION(ehci, hc_capbase) != GRUSBHC_HCIVERSION) { 135 ehci->big_endian_mmio = 1; 136 ehci->big_endian_desc = 1; 137 ehci->big_endian_capbase = 1; 138 } 139 140 rv = usb_add_hcd(hcd, irq, 0); 141 if (rv) 142 goto err_ioremap; 143 144 device_wakeup_enable(hcd->self.controller); 145 return 0; 146 147 err_ioremap: 148 irq_dispose_mapping(irq); 149 err_irq: 150 usb_put_hcd(hcd); 151 152 return rv; 153 } 154 155 156 static int ehci_hcd_grlib_remove(struct platform_device *op) 157 { 158 struct usb_hcd *hcd = platform_get_drvdata(op); 159 160 dev_dbg(&op->dev, "stopping GRLIB GRUSBHC EHCI USB Controller\n"); 161 162 usb_remove_hcd(hcd); 163 164 irq_dispose_mapping(hcd->irq); 165 166 usb_put_hcd(hcd); 167 168 return 0; 169 } 170 171 172 static const struct of_device_id ehci_hcd_grlib_of_match[] = { 173 { 174 .name = "GAISLER_EHCI", 175 }, 176 { 177 .name = "01_026", 178 }, 179 {}, 180 }; 181 MODULE_DEVICE_TABLE(of, ehci_hcd_grlib_of_match); 182 183 184 static struct platform_driver ehci_grlib_driver = { 185 .probe = ehci_hcd_grlib_probe, 186 .remove = ehci_hcd_grlib_remove, 187 .shutdown = usb_hcd_platform_shutdown, 188 .driver = { 189 .name = "grlib-ehci", 190 .of_match_table = ehci_hcd_grlib_of_match, 191 }, 192 }; 193