diff options
Diffstat (limited to 'drivers/usb/dwc2/platform.c')
| -rw-r--r-- | drivers/usb/dwc2/platform.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c new file mode 100644 index 000000000000..d01d0d3f2cf0 --- /dev/null +++ b/drivers/usb/dwc2/platform.c @@ -0,0 +1,187 @@ +/* + * platform.c - DesignWare HS OTG Controller platform driver + * + * Copyright (C) Matthijs Kooijman <matthijs@stdin.nl> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The names of the above-listed copyright holders may not be used + * to endorse or promote products derived from this software without + * specific prior written permission. + * + * ALTERNATIVELY, this software may be distributed under the terms of the + * GNU General Public License ("GPL") as published by the Free Software + * Foundation; either version 2 of the License, or (at your option) any + * later version. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> + +#include "core.h" +#include "hcd.h" + +static const char dwc2_driver_name[] = "dwc2"; + +static const struct dwc2_core_params params_bcm2835 = { + .otg_cap = 0, /* HNP/SRP capable */ + .otg_ver = 0, /* 1.3 */ + .dma_enable = 1, + .dma_desc_enable = 0, + .speed = 0, /* High Speed */ + .enable_dynamic_fifo = 1, + .en_multiple_tx_fifo = 1, + .host_rx_fifo_size = 774, /* 774 DWORDs */ + .host_nperio_tx_fifo_size = 256, /* 256 DWORDs */ + .host_perio_tx_fifo_size = 512, /* 512 DWORDs */ + .max_transfer_size = 65535, + .max_packet_count = 511, + .host_channels = 8, + .phy_type = 1, /* UTMI */ + .phy_utmi_width = 8, /* 8 bits */ + .phy_ulpi_ddr = 0, /* Single */ + .phy_ulpi_ext_vbus = 0, + .i2c_enable = 0, + .ulpi_fs_ls = 0, + .host_support_fs_ls_low_power = 0, + .host_ls_low_power_phy_clk = 0, /* 48 MHz */ + .ts_dline = 0, + .reload_ctl = 0, + .ahbcfg = 0x10, + .uframe_sched = 0, +}; + +/** + * dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the + * DWC_otg driver + * + * @dev: Platform device + * + * This routine is called, for example, when the rmmod command is executed. The + * device may or may not be electrically present. If it is present, the driver + * stops device processing. Any resources used on behalf of this device are + * freed. + */ +static int dwc2_driver_remove(struct platform_device *dev) +{ + struct dwc2_hsotg *hsotg = platform_get_drvdata(dev); + + dwc2_hcd_remove(hsotg); + + return 0; +} + +static const struct of_device_id dwc2_of_match_table[] = { + { .compatible = "brcm,bcm2835-usb", .data = ¶ms_bcm2835 }, + { .compatible = "snps,dwc2", .data = NULL }, + {}, +}; +MODULE_DEVICE_TABLE(of, dwc2_of_match_table); + +/** + * dwc2_driver_probe() - Called when the DWC_otg core is bound to the DWC_otg + * driver + * + * @dev: Platform device + * + * This routine creates the driver components required to control the device + * (core, HCD, and PCD) and initializes the device. The driver components are + * stored in a dwc2_hsotg structure. A reference to the dwc2_hsotg is saved + * in the device private data. This allows the driver to access the dwc2_hsotg + * structure on subsequent calls to driver methods for this device. + */ +static int dwc2_driver_probe(struct platform_device *dev) +{ + const struct of_device_id *match; + const struct dwc2_core_params *params; + struct dwc2_core_params defparams; + struct dwc2_hsotg *hsotg; + struct resource *res; + int retval; + int irq; + + match = of_match_device(dwc2_of_match_table, &dev->dev); + if (match && match->data) { + params = match->data; + } else { + /* Default all params to autodetect */ + dwc2_set_all_params(&defparams, -1); + params = &defparams; + } + + hsotg = devm_kzalloc(&dev->dev, sizeof(*hsotg), GFP_KERNEL); + if (!hsotg) + return -ENOMEM; + + hsotg->dev = &dev->dev; + + /* + * Use reasonable defaults so platforms don't have to provide these. + */ + if (!dev->dev.dma_mask) + dev->dev.dma_mask = &dev->dev.coherent_dma_mask; + retval = dma_set_coherent_mask(&dev->dev, DMA_BIT_MASK(32)); + if (retval) + return retval; + + irq = platform_get_irq(dev, 0); + if (irq < 0) { + dev_err(&dev->dev, "missing IRQ resource\n"); + return irq; + } + + res = platform_get_resource(dev, IORESOURCE_MEM, 0); + hsotg->regs = devm_ioremap_resource(&dev->dev, res); + if (IS_ERR(hsotg->regs)) + return PTR_ERR(hsotg->regs); + + dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n", + (unsigned long)res->start, hsotg->regs); + + retval = dwc2_hcd_init(hsotg, irq, params); + if (retval) + return retval; + + platform_set_drvdata(dev, hsotg); + + return retval; +} + +static struct platform_driver dwc2_platform_driver = { + .driver = { + .name = dwc2_driver_name, + .of_match_table = dwc2_of_match_table, + }, + .probe = dwc2_driver_probe, + .remove = dwc2_driver_remove, +}; + +module_platform_driver(dwc2_platform_driver); + +MODULE_DESCRIPTION("DESIGNWARE HS OTG Platform Glue"); +MODULE_AUTHOR("Matthijs Kooijman <matthijs@stdin.nl>"); +MODULE_LICENSE("Dual BSD/GPL"); |