Andrew Victor | 39a269c | 2006-01-22 10:32:13 -0800 | [diff] [blame] | 1 | /* |
| 2 | * OHCI HCD (Host Controller Driver) for USB. |
| 3 | * |
| 4 | * Copyright (C) 2004 SAN People (Pty) Ltd. |
| 5 | * Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org> |
| 6 | * |
| 7 | * AT91RM9200 Bus Glue |
| 8 | * |
| 9 | * Based on fragments of 2.4 driver by Rick Bronson. |
| 10 | * Based on ohci-omap.c |
| 11 | * |
| 12 | * This file is licenced under the GPL. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/clk.h> |
| 16 | #include <linux/platform_device.h> |
| 17 | |
| 18 | #include <asm/mach-types.h> |
| 19 | #include <asm/hardware.h> |
| 20 | #include <asm/arch/board.h> |
| 21 | |
| 22 | #ifndef CONFIG_ARCH_AT91RM9200 |
David Brownell | 68ba61b | 2006-04-02 20:26:21 -0800 | [diff] [blame] | 23 | #error "CONFIG_ARCH_AT91RM9200 must be defined." |
Andrew Victor | 39a269c | 2006-01-22 10:32:13 -0800 | [diff] [blame] | 24 | #endif |
| 25 | |
| 26 | /* interface and function clocks */ |
| 27 | static struct clk *iclk, *fclk; |
| 28 | |
| 29 | extern int usb_disabled(void); |
| 30 | |
| 31 | /*-------------------------------------------------------------------------*/ |
| 32 | |
| 33 | static void at91_start_hc(struct platform_device *pdev) |
| 34 | { |
| 35 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| 36 | struct ohci_regs __iomem *regs = hcd->regs; |
| 37 | |
| 38 | dev_dbg(&pdev->dev, "starting AT91RM9200 OHCI USB Controller\n"); |
| 39 | |
| 40 | /* |
| 41 | * Start the USB clocks. |
| 42 | */ |
| 43 | clk_enable(iclk); |
| 44 | clk_enable(fclk); |
| 45 | |
| 46 | /* |
| 47 | * The USB host controller must remain in reset. |
| 48 | */ |
| 49 | writel(0, ®s->control); |
| 50 | } |
| 51 | |
| 52 | static void at91_stop_hc(struct platform_device *pdev) |
| 53 | { |
| 54 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| 55 | struct ohci_regs __iomem *regs = hcd->regs; |
| 56 | |
| 57 | dev_dbg(&pdev->dev, "stopping AT91RM9200 OHCI USB Controller\n"); |
| 58 | |
| 59 | /* |
| 60 | * Put the USB host controller into reset. |
| 61 | */ |
| 62 | writel(0, ®s->control); |
| 63 | |
| 64 | /* |
| 65 | * Stop the USB clocks. |
| 66 | */ |
| 67 | clk_disable(fclk); |
| 68 | clk_disable(iclk); |
| 69 | } |
| 70 | |
| 71 | |
| 72 | /*-------------------------------------------------------------------------*/ |
| 73 | |
| 74 | static int usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *); |
| 75 | |
| 76 | /* configure so an HC device and id are always provided */ |
| 77 | /* always called with process context; sleeping is OK */ |
| 78 | |
| 79 | |
| 80 | /** |
| 81 | * usb_hcd_at91_probe - initialize AT91RM9200-based HCDs |
| 82 | * Context: !in_interrupt() |
| 83 | * |
| 84 | * Allocates basic resources for this USB host controller, and |
| 85 | * then invokes the start() method for the HCD associated with it |
| 86 | * through the hotplug entry's driver_data. |
Andrew Victor | 39a269c | 2006-01-22 10:32:13 -0800 | [diff] [blame] | 87 | */ |
| 88 | int usb_hcd_at91_probe (const struct hc_driver *driver, struct platform_device *pdev) |
| 89 | { |
| 90 | int retval; |
| 91 | struct usb_hcd *hcd = NULL; |
| 92 | |
| 93 | if (pdev->num_resources != 2) { |
| 94 | pr_debug("hcd probe: invalid num_resources"); |
| 95 | return -ENODEV; |
| 96 | } |
| 97 | |
| 98 | if ((pdev->resource[0].flags != IORESOURCE_MEM) || (pdev->resource[1].flags != IORESOURCE_IRQ)) { |
| 99 | pr_debug("hcd probe: invalid resource type\n"); |
| 100 | return -ENODEV; |
| 101 | } |
| 102 | |
| 103 | hcd = usb_create_hcd(driver, &pdev->dev, "at91rm9200"); |
| 104 | if (!hcd) |
| 105 | return -ENOMEM; |
| 106 | hcd->rsrc_start = pdev->resource[0].start; |
| 107 | hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1; |
| 108 | |
| 109 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { |
| 110 | pr_debug("request_mem_region failed\n"); |
| 111 | retval = -EBUSY; |
| 112 | goto err1; |
| 113 | } |
| 114 | |
| 115 | hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); |
| 116 | if (!hcd->regs) { |
| 117 | pr_debug("ioremap failed\n"); |
| 118 | retval = -EIO; |
| 119 | goto err2; |
| 120 | } |
| 121 | |
| 122 | iclk = clk_get(&pdev->dev, "ohci_clk"); |
| 123 | fclk = clk_get(&pdev->dev, "uhpck"); |
| 124 | |
| 125 | at91_start_hc(pdev); |
| 126 | ohci_hcd_init(hcd_to_ohci(hcd)); |
| 127 | |
| 128 | retval = usb_add_hcd(hcd, pdev->resource[1].start, SA_INTERRUPT); |
| 129 | if (retval == 0) |
| 130 | return retval; |
| 131 | |
| 132 | /* Error handling */ |
| 133 | at91_stop_hc(pdev); |
| 134 | |
| 135 | clk_put(fclk); |
| 136 | clk_put(iclk); |
| 137 | |
| 138 | iounmap(hcd->regs); |
| 139 | |
| 140 | err2: |
| 141 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
| 142 | |
| 143 | err1: |
| 144 | usb_put_hcd(hcd); |
| 145 | return retval; |
| 146 | } |
| 147 | |
| 148 | |
Andrew Victor | 39a269c | 2006-01-22 10:32:13 -0800 | [diff] [blame] | 149 | /* may be called with controller, bus, and devices active */ |
| 150 | |
| 151 | /** |
| 152 | * usb_hcd_at91_remove - shutdown processing for AT91RM9200-based HCDs |
| 153 | * @dev: USB Host Controller being removed |
| 154 | * Context: !in_interrupt() |
| 155 | * |
| 156 | * Reverses the effect of usb_hcd_at91_probe(), first invoking |
| 157 | * the HCD's stop() method. It is always called from a thread |
| 158 | * context, normally "rmmod", "apmd", or something similar. |
| 159 | * |
| 160 | */ |
| 161 | static int usb_hcd_at91_remove (struct usb_hcd *hcd, struct platform_device *pdev) |
| 162 | { |
| 163 | usb_remove_hcd(hcd); |
| 164 | at91_stop_hc(pdev); |
| 165 | iounmap(hcd->regs); |
David Brownell | 68ba61b | 2006-04-02 20:26:21 -0800 | [diff] [blame] | 166 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
Andrew Victor | 39a269c | 2006-01-22 10:32:13 -0800 | [diff] [blame] | 167 | |
David Brownell | 68ba61b | 2006-04-02 20:26:21 -0800 | [diff] [blame] | 168 | clk_put(fclk); |
| 169 | clk_put(iclk); |
| 170 | fclk = iclk = NULL; |
Andrew Victor | 39a269c | 2006-01-22 10:32:13 -0800 | [diff] [blame] | 171 | |
| 172 | dev_set_drvdata(&pdev->dev, NULL); |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | /*-------------------------------------------------------------------------*/ |
| 177 | |
| 178 | static int __devinit |
| 179 | ohci_at91_start (struct usb_hcd *hcd) |
| 180 | { |
| 181 | // struct at91_ohci_data *board = hcd->self.controller->platform_data; |
| 182 | struct ohci_hcd *ohci = hcd_to_ohci (hcd); |
| 183 | int ret; |
| 184 | |
| 185 | if ((ret = ohci_init(ohci)) < 0) |
| 186 | return ret; |
| 187 | |
| 188 | if ((ret = ohci_run(ohci)) < 0) { |
| 189 | err("can't start %s", hcd->self.bus_name); |
| 190 | ohci_stop(hcd); |
| 191 | return ret; |
| 192 | } |
| 193 | // hcd->self.root_hub->maxchild = board->ports; |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | /*-------------------------------------------------------------------------*/ |
| 198 | |
| 199 | static const struct hc_driver ohci_at91_hc_driver = { |
| 200 | .description = hcd_name, |
| 201 | .product_desc = "AT91RM9200 OHCI", |
| 202 | .hcd_priv_size = sizeof(struct ohci_hcd), |
| 203 | |
| 204 | /* |
| 205 | * generic hardware linkage |
| 206 | */ |
| 207 | .irq = ohci_irq, |
| 208 | .flags = HCD_USB11 | HCD_MEMORY, |
| 209 | |
| 210 | /* |
| 211 | * basic lifecycle operations |
| 212 | */ |
| 213 | .start = ohci_at91_start, |
| 214 | .stop = ohci_stop, |
| 215 | |
| 216 | /* |
| 217 | * managing i/o requests and associated device resources |
| 218 | */ |
| 219 | .urb_enqueue = ohci_urb_enqueue, |
| 220 | .urb_dequeue = ohci_urb_dequeue, |
| 221 | .endpoint_disable = ohci_endpoint_disable, |
| 222 | |
| 223 | /* |
| 224 | * scheduling support |
| 225 | */ |
| 226 | .get_frame_number = ohci_get_frame, |
| 227 | |
| 228 | /* |
| 229 | * root hub support |
| 230 | */ |
| 231 | .hub_status_data = ohci_hub_status_data, |
| 232 | .hub_control = ohci_hub_control, |
| 233 | |
| 234 | #ifdef CONFIG_PM |
David Brownell | 68ba61b | 2006-04-02 20:26:21 -0800 | [diff] [blame] | 235 | .bus_suspend = ohci_bus_suspend, |
| 236 | .bus_resume = ohci_bus_resume, |
Andrew Victor | 39a269c | 2006-01-22 10:32:13 -0800 | [diff] [blame] | 237 | #endif |
| 238 | .start_port_reset = ohci_start_port_reset, |
| 239 | }; |
| 240 | |
| 241 | /*-------------------------------------------------------------------------*/ |
| 242 | |
| 243 | static int ohci_hcd_at91_drv_probe(struct platform_device *dev) |
| 244 | { |
| 245 | return usb_hcd_at91_probe(&ohci_at91_hc_driver, dev); |
| 246 | } |
| 247 | |
| 248 | static int ohci_hcd_at91_drv_remove(struct platform_device *dev) |
| 249 | { |
| 250 | return usb_hcd_at91_remove(platform_get_drvdata(dev), dev); |
| 251 | } |
| 252 | |
| 253 | #ifdef CONFIG_PM |
Andrew Victor | 39a269c | 2006-01-22 10:32:13 -0800 | [diff] [blame] | 254 | |
David Brownell | 68ba61b | 2006-04-02 20:26:21 -0800 | [diff] [blame] | 255 | /* REVISIT suspend/resume look "too" simple here */ |
| 256 | |
| 257 | static int |
| 258 | ohci_hcd_at91_drv_suspend(struct platform_device *dev, pm_message_t mesg) |
| 259 | { |
Andrew Victor | 39a269c | 2006-01-22 10:32:13 -0800 | [diff] [blame] | 260 | clk_disable(fclk); |
David Brownell | 68ba61b | 2006-04-02 20:26:21 -0800 | [diff] [blame] | 261 | clk_disable(iclk); |
Andrew Victor | 39a269c | 2006-01-22 10:32:13 -0800 | [diff] [blame] | 262 | |
| 263 | return 0; |
| 264 | } |
| 265 | |
David Brownell | 68ba61b | 2006-04-02 20:26:21 -0800 | [diff] [blame] | 266 | static int ohci_hcd_at91_drv_resume(struct platform_device *dev) |
Andrew Victor | 39a269c | 2006-01-22 10:32:13 -0800 | [diff] [blame] | 267 | { |
David Brownell | 68ba61b | 2006-04-02 20:26:21 -0800 | [diff] [blame] | 268 | clk_enable(iclk); |
Andrew Victor | 39a269c | 2006-01-22 10:32:13 -0800 | [diff] [blame] | 269 | clk_enable(fclk); |
| 270 | |
| 271 | return 0; |
| 272 | } |
| 273 | #else |
| 274 | #define ohci_hcd_at91_drv_suspend NULL |
| 275 | #define ohci_hcd_at91_drv_resume NULL |
| 276 | #endif |
| 277 | |
David Brownell | 68ba61b | 2006-04-02 20:26:21 -0800 | [diff] [blame] | 278 | MODULE_ALIAS("at91rm9200-ohci"); |
| 279 | |
Andrew Victor | 39a269c | 2006-01-22 10:32:13 -0800 | [diff] [blame] | 280 | static struct platform_driver ohci_hcd_at91_driver = { |
| 281 | .probe = ohci_hcd_at91_drv_probe, |
| 282 | .remove = ohci_hcd_at91_drv_remove, |
| 283 | .suspend = ohci_hcd_at91_drv_suspend, |
| 284 | .resume = ohci_hcd_at91_drv_resume, |
| 285 | .driver = { |
| 286 | .name = "at91rm9200-ohci", |
| 287 | .owner = THIS_MODULE, |
| 288 | }, |
| 289 | }; |
| 290 | |
| 291 | static int __init ohci_hcd_at91_init (void) |
| 292 | { |
| 293 | if (usb_disabled()) |
| 294 | return -ENODEV; |
| 295 | |
| 296 | return platform_driver_register(&ohci_hcd_at91_driver); |
| 297 | } |
| 298 | |
| 299 | static void __exit ohci_hcd_at91_cleanup (void) |
| 300 | { |
| 301 | platform_driver_unregister(&ohci_hcd_at91_driver); |
| 302 | } |
| 303 | |
| 304 | module_init (ohci_hcd_at91_init); |
| 305 | module_exit (ohci_hcd_at91_cleanup); |