The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/allwinner/a10_ehci.c

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    1 /*-
    2  * Copyright (c) 2012 Ganbold Tsagaankhuu <ganbold@gmail.com>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 /*
   28  * Allwinner A10 attachment driver for the USB Enhanced Host Controller.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: releng/10.0/sys/arm/allwinner/a10_ehci.c 246851 2013-02-15 21:29:03Z gonzo $");
   33 
   34 #include "opt_bus.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/bus.h>
   39 #include <sys/rman.h>
   40 #include <sys/condvar.h>
   41 #include <sys/kernel.h>
   42 #include <sys/module.h>
   43 #include <sys/gpio.h>
   44 
   45 #include <machine/bus.h>
   46 #include <dev/ofw/ofw_bus.h> 
   47 #include <dev/ofw/ofw_bus_subr.h>
   48 
   49 #include <dev/usb/usb.h> 
   50 #include <dev/usb/usbdi.h>
   51 
   52 #include <dev/usb/usb_core.h>
   53 #include <dev/usb/usb_busdma.h>
   54 #include <dev/usb/usb_process.h>
   55 #include <dev/usb/usb_util.h>
   56 
   57 #include <dev/usb/usb_controller.h>
   58 #include <dev/usb/usb_bus.h>
   59 #include <dev/usb/controller/ehci.h>
   60 #include <dev/usb/controller/ehcireg.h>
   61 
   62 #include "gpio_if.h"
   63 
   64 #include "a10_clk.h"
   65 
   66 #define EHCI_HC_DEVSTR                  "Allwinner Integrated USB 2.0 controller"
   67 
   68 #define SW_USB_PMU_IRQ_ENABLE           0x800
   69 
   70 #define SW_SDRAM_REG_HPCR_USB1          (0x250 + ((1 << 2) * 4))
   71 #define SW_SDRAM_REG_HPCR_USB2          (0x250 + ((1 << 2) * 5))
   72 #define SW_SDRAM_BP_HPCR_ACCESS         (1 << 0)
   73 
   74 #define SW_ULPI_BYPASS                  (1 << 0)
   75 #define SW_AHB_INCRX_ALIGN              (1 << 8)
   76 #define SW_AHB_INCR4                    (1 << 9)
   77 #define SW_AHB_INCR8                    (1 << 10)
   78 #define GPIO_USB1_PWR                   230
   79 #define GPIO_USB2_PWR                   227
   80 
   81 #define A10_READ_4(sc, reg)             \
   82         bus_space_read_4((sc)->sc_io_tag, (sc)->sc_io_hdl, reg)
   83 
   84 #define A10_WRITE_4(sc, reg, data)      \
   85         bus_space_write_4((sc)->sc_io_tag, (sc)->sc_io_hdl, reg, data)
   86 
   87 static device_attach_t a10_ehci_attach;
   88 static device_detach_t a10_ehci_detach;
   89 
   90 bs_r_1_proto(reversed);
   91 bs_w_1_proto(reversed);
   92 
   93 static int
   94 a10_ehci_probe(device_t self)
   95 {
   96         if (!ofw_bus_is_compatible(self, "allwinner,usb-ehci")) 
   97                 return (ENXIO);
   98 
   99         device_set_desc(self, EHCI_HC_DEVSTR);
  100 
  101         return (BUS_PROBE_DEFAULT);
  102 }
  103 
  104 static int
  105 a10_ehci_attach(device_t self)
  106 {
  107         ehci_softc_t *sc = device_get_softc(self);
  108         bus_space_handle_t bsh;
  109         device_t sc_gpio_dev;
  110         int err;
  111         int rid;
  112         uint32_t reg_value = 0;
  113 
  114         /* initialise some bus fields */
  115         sc->sc_bus.parent = self;
  116         sc->sc_bus.devices = sc->sc_devices;
  117         sc->sc_bus.devices_max = EHCI_MAX_DEVICES;
  118 
  119         /* get all DMA memory */
  120         if (usb_bus_mem_alloc_all(&sc->sc_bus,
  121             USB_GET_DMA_TAG(self), &ehci_iterate_hw_softc)) {
  122                 return (ENOMEM);
  123         }
  124 
  125         sc->sc_bus.usbrev = USB_REV_2_0;
  126 
  127         rid = 0;
  128         sc->sc_io_res = bus_alloc_resource_any(self, SYS_RES_MEMORY, &rid, RF_ACTIVE);
  129         if (!sc->sc_io_res) {
  130                 device_printf(self, "Could not map memory\n");
  131                 goto error;
  132         }
  133 
  134         sc->sc_io_tag = rman_get_bustag(sc->sc_io_res);
  135         sc->sc_io_hdl = rman_get_bushandle(sc->sc_io_res);
  136         bsh = rman_get_bushandle(sc->sc_io_res);
  137 
  138         sc->sc_io_size = rman_get_size(sc->sc_io_res);
  139 
  140         if (bus_space_subregion(sc->sc_io_tag, bsh, 0x00,
  141             sc->sc_io_size, &sc->sc_io_hdl) != 0)
  142                 panic("%s: unable to subregion USB host registers",
  143                     device_get_name(self));
  144 
  145         rid = 0;
  146         sc->sc_irq_res = bus_alloc_resource_any(self, SYS_RES_IRQ, &rid,
  147             RF_SHAREABLE | RF_ACTIVE);
  148         if (sc->sc_irq_res == NULL) {
  149                 device_printf(self, "Could not allocate irq\n");
  150                 goto error;
  151         }
  152         sc->sc_bus.bdev = device_add_child(self, "usbus", -1);
  153         if (!sc->sc_bus.bdev) {
  154                 device_printf(self, "Could not add USB device\n");
  155                 goto error;
  156         }
  157         device_set_ivars(sc->sc_bus.bdev, &sc->sc_bus);
  158         device_set_desc(sc->sc_bus.bdev, EHCI_HC_DEVSTR);
  159 
  160         sprintf(sc->sc_vendor, "Allwinner");
  161 
  162         /* Get the GPIO device, we need this to give power to USB */
  163         sc_gpio_dev = devclass_get_device(devclass_find("gpio"), 0);
  164         if (sc_gpio_dev == NULL) {
  165                 device_printf(self, "Error: failed to get the GPIO device\n");
  166                 goto error;
  167         }
  168 
  169         err = bus_setup_intr(self, sc->sc_irq_res, INTR_TYPE_BIO | INTR_MPSAFE,
  170             NULL, (driver_intr_t *)ehci_interrupt, sc, &sc->sc_intr_hdl);
  171         if (err) {
  172                 device_printf(self, "Could not setup irq, %d\n", err);
  173                 sc->sc_intr_hdl = NULL;
  174                 goto error;
  175         }
  176 
  177         sc->sc_flags |= EHCI_SCFLG_DONTRESET;
  178 
  179         /* Enable clock for USB */
  180         a10_clk_usb_activate();
  181 
  182         /* Give power to USB */
  183         GPIO_PIN_SETFLAGS(sc_gpio_dev, GPIO_USB2_PWR, GPIO_PIN_OUTPUT);
  184         GPIO_PIN_SET(sc_gpio_dev, GPIO_USB2_PWR, GPIO_PIN_HIGH);
  185 
  186         /* Give power to USB */
  187         GPIO_PIN_SETFLAGS(sc_gpio_dev, GPIO_USB1_PWR, GPIO_PIN_OUTPUT);
  188         GPIO_PIN_SET(sc_gpio_dev, GPIO_USB1_PWR, GPIO_PIN_HIGH);
  189 
  190         /* Enable passby */
  191         reg_value = A10_READ_4(sc, SW_USB_PMU_IRQ_ENABLE);
  192         reg_value |= SW_AHB_INCR8; /* AHB INCR8 enable */
  193         reg_value |= SW_AHB_INCR4; /* AHB burst type INCR4 enable */
  194         reg_value |= SW_AHB_INCRX_ALIGN; /* AHB INCRX align enable */
  195         reg_value |= SW_ULPI_BYPASS; /* ULPI bypass enable */
  196         A10_WRITE_4(sc, SW_USB_PMU_IRQ_ENABLE, reg_value);
  197 
  198         /* Configure port */
  199         reg_value = A10_READ_4(sc, SW_SDRAM_REG_HPCR_USB2);
  200         reg_value |= SW_SDRAM_BP_HPCR_ACCESS;
  201         A10_WRITE_4(sc, SW_SDRAM_REG_HPCR_USB2, reg_value);
  202 
  203         err = ehci_init(sc);
  204         if (!err) {
  205                 err = device_probe_and_attach(sc->sc_bus.bdev);
  206         }
  207         if (err) {
  208                 device_printf(self, "USB init failed err=%d\n", err);
  209                 goto error;
  210         }
  211         return (0);
  212 
  213 error:
  214         a10_ehci_detach(self);
  215         return (ENXIO);
  216 }
  217 
  218 static int
  219 a10_ehci_detach(device_t self)
  220 {
  221         ehci_softc_t *sc = device_get_softc(self);
  222         device_t bdev;
  223         int err;
  224         uint32_t reg_value = 0;
  225 
  226         if (sc->sc_bus.bdev) {
  227                 bdev = sc->sc_bus.bdev;
  228                 device_detach(bdev);
  229                 device_delete_child(self, bdev);
  230         }
  231         /* during module unload there are lots of children leftover */
  232         device_delete_children(self);
  233 
  234         if (sc->sc_irq_res && sc->sc_intr_hdl) {
  235                 /*
  236                  * only call ehci_detach() after ehci_init()
  237                  */
  238                 ehci_detach(sc);
  239 
  240                 err = bus_teardown_intr(self, sc->sc_irq_res, sc->sc_intr_hdl);
  241 
  242                 if (err)
  243                         /* XXX or should we panic? */
  244                         device_printf(self, "Could not tear down irq, %d\n",
  245                             err);
  246                 sc->sc_intr_hdl = NULL;
  247         }
  248 
  249         if (sc->sc_irq_res) {
  250                 bus_release_resource(self, SYS_RES_IRQ, 0, sc->sc_irq_res);
  251                 sc->sc_irq_res = NULL;
  252         }
  253         if (sc->sc_io_res) {
  254                 bus_release_resource(self, SYS_RES_MEMORY, 0,
  255                     sc->sc_io_res);
  256                 sc->sc_io_res = NULL;
  257         }
  258         usb_bus_mem_free_all(&sc->sc_bus, &ehci_iterate_hw_softc);
  259 
  260         /* Disable configure port */
  261         reg_value = A10_READ_4(sc, SW_SDRAM_REG_HPCR_USB2);
  262         reg_value &= ~SW_SDRAM_BP_HPCR_ACCESS;
  263         A10_WRITE_4(sc, SW_SDRAM_REG_HPCR_USB2, reg_value);
  264 
  265         /* Disable passby */
  266         reg_value = A10_READ_4(sc, SW_USB_PMU_IRQ_ENABLE);
  267         reg_value &= ~SW_AHB_INCR8; /* AHB INCR8 disable */
  268         reg_value &= ~SW_AHB_INCR4; /* AHB burst type INCR4 disable */
  269         reg_value &= ~SW_AHB_INCRX_ALIGN; /* AHB INCRX align disable */
  270         reg_value &= ~SW_ULPI_BYPASS; /* ULPI bypass disable */
  271         A10_WRITE_4(sc, SW_USB_PMU_IRQ_ENABLE, reg_value);
  272 
  273         /* Disable clock for USB */
  274         a10_clk_usb_deactivate();
  275 
  276         return (0);
  277 }
  278 
  279 static device_method_t ehci_methods[] = {
  280         /* Device interface */
  281         DEVMETHOD(device_probe, a10_ehci_probe),
  282         DEVMETHOD(device_attach, a10_ehci_attach),
  283         DEVMETHOD(device_detach, a10_ehci_detach),
  284         DEVMETHOD(device_suspend, bus_generic_suspend),
  285         DEVMETHOD(device_resume, bus_generic_resume),
  286         DEVMETHOD(device_shutdown, bus_generic_shutdown),
  287 
  288         DEVMETHOD_END
  289 };
  290 
  291 static driver_t ehci_driver = {
  292         .name = "ehci",
  293         .methods = ehci_methods,
  294         .size = sizeof(ehci_softc_t),
  295 };
  296 
  297 static devclass_t ehci_devclass;
  298 
  299 DRIVER_MODULE(ehci, simplebus, ehci_driver, ehci_devclass, 0, 0);
  300 MODULE_DEPEND(ehci, usb, 1, 1, 1);

Cache object: 948344b60f0ef3d14e8f774b190e31d5


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