diff options
Diffstat (limited to 'drivers/usb/host/ohci-nxp.c')
| -rw-r--r-- | drivers/usb/host/ohci-nxp.c | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-nxp.c b/drivers/usb/host/ohci-nxp.c new file mode 100644 index 000000000..f5f532601 --- /dev/null +++ b/drivers/usb/host/ohci-nxp.c @@ -0,0 +1,280 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * driver for NXP USB Host devices + * + * Currently supported OHCI host devices: + * - NXP LPC32xx + * + * Authors: Dmitry Chigirev <source@mvista.com> + * Vitaly Wool <vitalywool@gmail.com> + * + * 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 <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/io.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/usb/isp1301.h> +#include <linux/usb.h> +#include <linux/usb/hcd.h> + +#include "ohci.h" + +#include <mach/hardware.h> + +#define USB_CONFIG_BASE 0x31020000 +#define USB_OTG_STAT_CONTROL IO_ADDRESS(USB_CONFIG_BASE + 0x110) + +/* 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 struct clk *usb_host_clk; + +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) +{ + unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN; + + __raw_writel(tmp, USB_OTG_STAT_CONTROL); + isp1301_vbus_on(); +} + +static void ohci_nxp_stop_hc(void) +{ + unsigned long tmp; + + isp1301_vbus_off(); + tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN; + __raw_writel(tmp, USB_OTG_STAT_CONTROL); +} + +static int ohci_hcd_nxp_probe(struct platform_device *pdev) +{ + struct usb_hcd *hcd = 0; + const struct hc_driver *driver = &ohci_nxp_hc_driver; + struct resource *res; + int ret = 0, irq; + struct device_node *isp1301_node; + + 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); + 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(&pdev->dev, NULL); + if (IS_ERR(usb_host_clk)) { + dev_err(&pdev->dev, "failed to acquire USB OHCI clock\n"); + ret = PTR_ERR(usb_host_clk); + goto fail_disable; + } + + ret = clk_prepare_enable(usb_host_clk); + if (ret < 0) { + dev_err(&pdev->dev, "failed to start USB OHCI clock\n"); + 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_hcd; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + hcd->regs = devm_ioremap_resource(&pdev->dev, 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_hcd: + clk_disable_unprepare(usb_host_clk); +fail_disable: + isp1301_i2c_client = NULL; + return ret; +} + +static int 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); + clk_disable_unprepare(usb_host_clk); + isp1301_i2c_client = NULL; + + return 0; +} + +/* 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; + + pr_info("%s: " DRIVER_DESC "\n", hcd_name); + + 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"); |