![Tony Lindgren](/assets/img/avatar_default.png)
Set up function pointers for DMA so get closer to being able to build in all the DMA engines. Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
211 lines
5.2 KiB
C
211 lines
5.2 KiB
C
/*
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* Ingenic JZ4740 "glue layer"
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*
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* Copyright (C) 2013, Apelete Seketeli <apelete@seketeli.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/usb/usb_phy_generic.h>
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#include "musb_core.h"
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struct jz4740_glue {
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struct device *dev;
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struct platform_device *musb;
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struct clk *clk;
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};
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static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
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{
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unsigned long flags;
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irqreturn_t retval = IRQ_NONE;
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struct musb *musb = __hci;
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spin_lock_irqsave(&musb->lock, flags);
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musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
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musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
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musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
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/*
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* The controller is gadget only, the state of the host mode IRQ bits is
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* undefined. Mask them to make sure that the musb driver core will
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* never see them set
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*/
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musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
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MUSB_INTR_RESET | MUSB_INTR_SOF;
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if (musb->int_usb || musb->int_tx || musb->int_rx)
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retval = musb_interrupt(musb);
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spin_unlock_irqrestore(&musb->lock, flags);
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return retval;
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}
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static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
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{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
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{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
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{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
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};
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static struct musb_hdrc_config jz4740_musb_config = {
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/* Silicon does not implement USB OTG. */
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.multipoint = 0,
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/* Max EPs scanned, driver will decide which EP can be used. */
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.num_eps = 4,
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/* RAMbits needed to configure EPs from table */
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.ram_bits = 9,
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.fifo_cfg = jz4740_musb_fifo_cfg,
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.fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
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};
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static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
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.mode = MUSB_PERIPHERAL,
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.config = &jz4740_musb_config,
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};
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static int jz4740_musb_init(struct musb *musb)
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{
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usb_phy_generic_register();
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musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
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if (!musb->xceiv) {
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pr_err("HS UDC: no transceiver configured\n");
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return -ENODEV;
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}
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/* Silicon does not implement ConfigData register.
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* Set dyn_fifo to avoid reading EP config from hardware.
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*/
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musb->dyn_fifo = true;
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musb->isr = jz4740_musb_interrupt;
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return 0;
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}
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static int jz4740_musb_exit(struct musb *musb)
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{
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usb_put_phy(musb->xceiv);
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return 0;
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}
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/*
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* DMA has not been confirmed to work with CONFIG_USB_INVENTRA_DMA,
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* so let's not set up the dma function pointers yet.
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*/
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static const struct musb_platform_ops jz4740_musb_ops = {
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.quirks = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP,
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.fifo_mode = 2,
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.init = jz4740_musb_init,
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.exit = jz4740_musb_exit,
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};
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static int jz4740_probe(struct platform_device *pdev)
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{
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struct musb_hdrc_platform_data *pdata = &jz4740_musb_platform_data;
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struct platform_device *musb;
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struct jz4740_glue *glue;
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struct clk *clk;
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int ret;
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glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
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if (!glue)
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return -ENOMEM;
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musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
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if (!musb) {
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dev_err(&pdev->dev, "failed to allocate musb device\n");
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return -ENOMEM;
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}
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clk = devm_clk_get(&pdev->dev, "udc");
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if (IS_ERR(clk)) {
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dev_err(&pdev->dev, "failed to get clock\n");
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ret = PTR_ERR(clk);
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goto err_platform_device_put;
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}
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ret = clk_prepare_enable(clk);
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if (ret) {
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dev_err(&pdev->dev, "failed to enable clock\n");
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goto err_platform_device_put;
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}
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musb->dev.parent = &pdev->dev;
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glue->dev = &pdev->dev;
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glue->musb = musb;
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glue->clk = clk;
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pdata->platform_ops = &jz4740_musb_ops;
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platform_set_drvdata(pdev, glue);
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ret = platform_device_add_resources(musb, pdev->resource,
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pdev->num_resources);
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if (ret) {
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dev_err(&pdev->dev, "failed to add resources\n");
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goto err_clk_disable;
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}
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ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
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if (ret) {
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dev_err(&pdev->dev, "failed to add platform_data\n");
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goto err_clk_disable;
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}
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ret = platform_device_add(musb);
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if (ret) {
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dev_err(&pdev->dev, "failed to register musb device\n");
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goto err_clk_disable;
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}
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return 0;
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err_clk_disable:
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clk_disable_unprepare(clk);
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err_platform_device_put:
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platform_device_put(musb);
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return ret;
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}
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static int jz4740_remove(struct platform_device *pdev)
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{
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struct jz4740_glue *glue = platform_get_drvdata(pdev);
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platform_device_unregister(glue->musb);
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usb_phy_generic_unregister(pdev);
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clk_disable_unprepare(glue->clk);
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return 0;
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}
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static struct platform_driver jz4740_driver = {
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.probe = jz4740_probe,
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.remove = jz4740_remove,
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.driver = {
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.name = "musb-jz4740",
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},
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};
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MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
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MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
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MODULE_LICENSE("GPL v2");
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module_platform_driver(jz4740_driver);
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