291 lines
7.4 KiB
C
291 lines
7.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* driver for NXP USB Host devices
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*
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* Currently supported OHCI host devices:
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* - NXP LPC32xx
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*
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* Authors: Dmitry Chigirev <source@mvista.com>
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* Vitaly Wool <vitalywool@gmail.com>
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*
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* register initialization is based on code examples provided by Philips
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* Copyright (c) 2005 Koninklijke Philips Electronics N.V.
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*
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* NOTE: This driver does not have suspend/resume functionality
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* This driver is intended for engineering development purposes only
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*
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* 2005-2006 (c) MontaVista Software, Inc.
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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/io.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/usb/isp1301.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include "ohci.h"
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#define USB_CONFIG_BASE 0x31020000
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/* USB_OTG_STAT_CONTROL bit defines */
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#define TRANSPARENT_I2C_EN (1 << 7)
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#define HOST_EN (1 << 0)
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/* On LPC32xx, those are undefined */
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#ifndef start_int_set_falling_edge
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#define start_int_set_falling_edge(irq)
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#define start_int_set_rising_edge(irq)
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#define start_int_ack(irq)
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#define start_int_mask(irq)
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#define start_int_umask(irq)
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#endif
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#define DRIVER_DESC "OHCI NXP driver"
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static const char hcd_name[] = "ohci-nxp";
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static struct hc_driver __read_mostly ohci_nxp_hc_driver;
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static struct i2c_client *isp1301_i2c_client;
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static struct clk *usb_host_clk;
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static void isp1301_configure_lpc32xx(void)
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{
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/* LPC32XX only supports DAT_SE0 USB mode */
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/* This sequence is important */
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/* Disable transparent UART mode first */
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i2c_smbus_write_byte_data(isp1301_i2c_client,
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(ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
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MC1_UART_EN);
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i2c_smbus_write_byte_data(isp1301_i2c_client,
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(ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
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~MC1_SPEED_REG);
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i2c_smbus_write_byte_data(isp1301_i2c_client,
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ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
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i2c_smbus_write_byte_data(isp1301_i2c_client,
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(ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR),
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~0);
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i2c_smbus_write_byte_data(isp1301_i2c_client,
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ISP1301_I2C_MODE_CONTROL_2,
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(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL));
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i2c_smbus_write_byte_data(isp1301_i2c_client,
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(ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR), ~0);
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i2c_smbus_write_byte_data(isp1301_i2c_client,
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ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
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i2c_smbus_write_byte_data(isp1301_i2c_client,
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ISP1301_I2C_OTG_CONTROL_1,
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(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
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i2c_smbus_write_byte_data(isp1301_i2c_client,
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(ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
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(OTG1_DM_PULLUP | OTG1_DP_PULLUP));
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i2c_smbus_write_byte_data(isp1301_i2c_client,
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ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
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i2c_smbus_write_byte_data(isp1301_i2c_client,
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ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR,
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~0);
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i2c_smbus_write_byte_data(isp1301_i2c_client,
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ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
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printk(KERN_INFO "ISP1301 Vendor ID : 0x%04x\n",
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i2c_smbus_read_word_data(isp1301_i2c_client, 0x00));
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printk(KERN_INFO "ISP1301 Product ID : 0x%04x\n",
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i2c_smbus_read_word_data(isp1301_i2c_client, 0x02));
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printk(KERN_INFO "ISP1301 Version ID : 0x%04x\n",
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i2c_smbus_read_word_data(isp1301_i2c_client, 0x14));
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}
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static void isp1301_configure(void)
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{
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isp1301_configure_lpc32xx();
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}
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static inline void isp1301_vbus_on(void)
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{
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i2c_smbus_write_byte_data(isp1301_i2c_client, ISP1301_I2C_OTG_CONTROL_1,
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OTG1_VBUS_DRV);
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}
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static inline void isp1301_vbus_off(void)
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{
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i2c_smbus_write_byte_data(isp1301_i2c_client,
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ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR,
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OTG1_VBUS_DRV);
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}
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static void ohci_nxp_start_hc(void)
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{
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void __iomem *usb_otg_stat_control = ioremap(USB_CONFIG_BASE + 0x110, 4);
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unsigned long tmp;
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if (WARN_ON(!usb_otg_stat_control))
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return;
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tmp = __raw_readl(usb_otg_stat_control) | HOST_EN;
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__raw_writel(tmp, usb_otg_stat_control);
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isp1301_vbus_on();
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iounmap(usb_otg_stat_control);
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}
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static void ohci_nxp_stop_hc(void)
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{
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void __iomem *usb_otg_stat_control = ioremap(USB_CONFIG_BASE + 0x110, 4);
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unsigned long tmp;
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if (WARN_ON(!usb_otg_stat_control))
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return;
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isp1301_vbus_off();
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tmp = __raw_readl(usb_otg_stat_control) & ~HOST_EN;
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__raw_writel(tmp, usb_otg_stat_control);
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iounmap(usb_otg_stat_control);
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}
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static int ohci_hcd_nxp_probe(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = NULL;
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const struct hc_driver *driver = &ohci_nxp_hc_driver;
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struct resource *res;
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int ret = 0, irq;
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struct device_node *isp1301_node;
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if (pdev->dev.of_node) {
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isp1301_node = of_parse_phandle(pdev->dev.of_node,
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"transceiver", 0);
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} else {
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isp1301_node = NULL;
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}
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isp1301_i2c_client = isp1301_get_client(isp1301_node);
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of_node_put(isp1301_node);
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if (!isp1301_i2c_client)
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return -EPROBE_DEFER;
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ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
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if (ret)
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goto fail_disable;
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dev_dbg(&pdev->dev, "%s: " DRIVER_DESC " (nxp)\n", hcd_name);
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if (usb_disabled()) {
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dev_err(&pdev->dev, "USB is disabled\n");
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ret = -ENODEV;
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goto fail_disable;
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}
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/* Enable USB host clock */
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usb_host_clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(usb_host_clk)) {
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dev_err(&pdev->dev, "failed to acquire USB OHCI clock\n");
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ret = PTR_ERR(usb_host_clk);
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goto fail_disable;
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}
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ret = clk_prepare_enable(usb_host_clk);
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if (ret < 0) {
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dev_err(&pdev->dev, "failed to start USB OHCI clock\n");
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goto fail_disable;
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}
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isp1301_configure();
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hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
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if (!hcd) {
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dev_err(&pdev->dev, "Failed to allocate HC buffer\n");
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ret = -ENOMEM;
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goto fail_hcd;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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hcd->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(hcd->regs)) {
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ret = PTR_ERR(hcd->regs);
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goto fail_resource;
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}
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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ret = -ENXIO;
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goto fail_resource;
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}
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ohci_nxp_start_hc();
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platform_set_drvdata(pdev, hcd);
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dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
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ret = usb_add_hcd(hcd, irq, 0);
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if (ret == 0) {
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device_wakeup_enable(hcd->self.controller);
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return ret;
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}
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ohci_nxp_stop_hc();
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fail_resource:
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usb_put_hcd(hcd);
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fail_hcd:
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clk_disable_unprepare(usb_host_clk);
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fail_disable:
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isp1301_i2c_client = NULL;
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return ret;
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}
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static int ohci_hcd_nxp_remove(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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usb_remove_hcd(hcd);
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ohci_nxp_stop_hc();
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usb_put_hcd(hcd);
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clk_disable_unprepare(usb_host_clk);
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isp1301_i2c_client = NULL;
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return 0;
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}
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/* work with hotplug and coldplug */
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MODULE_ALIAS("platform:usb-ohci");
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#ifdef CONFIG_OF
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static const struct of_device_id ohci_hcd_nxp_match[] = {
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{ .compatible = "nxp,ohci-nxp" },
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{},
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};
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MODULE_DEVICE_TABLE(of, ohci_hcd_nxp_match);
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#endif
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static struct platform_driver ohci_hcd_nxp_driver = {
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.driver = {
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.name = "usb-ohci",
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.of_match_table = of_match_ptr(ohci_hcd_nxp_match),
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},
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.probe = ohci_hcd_nxp_probe,
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.remove = ohci_hcd_nxp_remove,
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};
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static int __init ohci_nxp_init(void)
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{
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if (usb_disabled())
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return -ENODEV;
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ohci_init_driver(&ohci_nxp_hc_driver, NULL);
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return platform_driver_register(&ohci_hcd_nxp_driver);
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}
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module_init(ohci_nxp_init);
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static void __exit ohci_nxp_cleanup(void)
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{
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platform_driver_unregister(&ohci_hcd_nxp_driver);
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}
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module_exit(ohci_nxp_cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL v2");
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