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