1 /* 2 * driver for NXP USB Host devices 3 * 4 * Currently supported OHCI host devices: 5 * - NXP LPC32xx 6 * 7 * Authors: Dmitry Chigirev <source@mvista.com> 8 * Vitaly Wool <vitalywool@gmail.com> 9 * 10 * register initialization is based on code examples provided by Philips 11 * Copyright (c) 2005 Koninklijke Philips Electronics N.V. 12 * 13 * NOTE: This driver does not have suspend/resume functionality 14 * This driver is intended for engineering development purposes only 15 * 16 * 2005-2006 (c) MontaVista Software, Inc. This file is licensed under 17 * the terms of the GNU General Public License version 2. This program 18 * is licensed "as is" without any warranty of any kind, whether express 19 * or implied. 20 */ 21 #include <linux/clk.h> 22 #include <linux/dma-mapping.h> 23 #include <linux/io.h> 24 #include <linux/i2c.h> 25 #include <linux/module.h> 26 #include <linux/of.h> 27 #include <linux/platform_device.h> 28 #include <linux/usb/isp1301.h> 29 #include <linux/usb.h> 30 #include <linux/usb/hcd.h> 31 32 #include "ohci.h" 33 34 #include <mach/hardware.h> 35 36 #define USB_CONFIG_BASE 0x31020000 37 #define USB_OTG_STAT_CONTROL IO_ADDRESS(USB_CONFIG_BASE + 0x110) 38 39 /* USB_OTG_STAT_CONTROL bit defines */ 40 #define TRANSPARENT_I2C_EN (1 << 7) 41 #define HOST_EN (1 << 0) 42 43 /* On LPC32xx, those are undefined */ 44 #ifndef start_int_set_falling_edge 45 #define start_int_set_falling_edge(irq) 46 #define start_int_set_rising_edge(irq) 47 #define start_int_ack(irq) 48 #define start_int_mask(irq) 49 #define start_int_umask(irq) 50 #endif 51 52 #define DRIVER_DESC "OHCI NXP driver" 53 54 static const char hcd_name[] = "ohci-nxp"; 55 static struct hc_driver __read_mostly ohci_nxp_hc_driver; 56 57 static struct i2c_client *isp1301_i2c_client; 58 59 extern int usb_disabled(void); 60 61 static struct clk *usb_host_clk; 62 63 static void isp1301_configure_lpc32xx(void) 64 { 65 /* LPC32XX only supports DAT_SE0 USB mode */ 66 /* This sequence is important */ 67 68 /* Disable transparent UART mode first */ 69 i2c_smbus_write_byte_data(isp1301_i2c_client, 70 (ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR), 71 MC1_UART_EN); 72 i2c_smbus_write_byte_data(isp1301_i2c_client, 73 (ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR), 74 ~MC1_SPEED_REG); 75 i2c_smbus_write_byte_data(isp1301_i2c_client, 76 ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG); 77 i2c_smbus_write_byte_data(isp1301_i2c_client, 78 (ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR), 79 ~0); 80 i2c_smbus_write_byte_data(isp1301_i2c_client, 81 ISP1301_I2C_MODE_CONTROL_2, 82 (MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL)); 83 i2c_smbus_write_byte_data(isp1301_i2c_client, 84 (ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR), ~0); 85 i2c_smbus_write_byte_data(isp1301_i2c_client, 86 ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0); 87 i2c_smbus_write_byte_data(isp1301_i2c_client, 88 ISP1301_I2C_OTG_CONTROL_1, 89 (OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN)); 90 i2c_smbus_write_byte_data(isp1301_i2c_client, 91 (ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR), 92 (OTG1_DM_PULLUP | OTG1_DP_PULLUP)); 93 i2c_smbus_write_byte_data(isp1301_i2c_client, 94 ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR, ~0); 95 i2c_smbus_write_byte_data(isp1301_i2c_client, 96 ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR, 97 ~0); 98 i2c_smbus_write_byte_data(isp1301_i2c_client, 99 ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR, ~0); 100 101 printk(KERN_INFO "ISP1301 Vendor ID : 0x%04x\n", 102 i2c_smbus_read_word_data(isp1301_i2c_client, 0x00)); 103 printk(KERN_INFO "ISP1301 Product ID : 0x%04x\n", 104 i2c_smbus_read_word_data(isp1301_i2c_client, 0x02)); 105 printk(KERN_INFO "ISP1301 Version ID : 0x%04x\n", 106 i2c_smbus_read_word_data(isp1301_i2c_client, 0x14)); 107 } 108 109 static void isp1301_configure(void) 110 { 111 isp1301_configure_lpc32xx(); 112 } 113 114 static inline void isp1301_vbus_on(void) 115 { 116 i2c_smbus_write_byte_data(isp1301_i2c_client, ISP1301_I2C_OTG_CONTROL_1, 117 OTG1_VBUS_DRV); 118 } 119 120 static inline void isp1301_vbus_off(void) 121 { 122 i2c_smbus_write_byte_data(isp1301_i2c_client, 123 ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR, 124 OTG1_VBUS_DRV); 125 } 126 127 static void ohci_nxp_start_hc(void) 128 { 129 unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN; 130 __raw_writel(tmp, USB_OTG_STAT_CONTROL); 131 isp1301_vbus_on(); 132 } 133 134 static void ohci_nxp_stop_hc(void) 135 { 136 unsigned long tmp; 137 isp1301_vbus_off(); 138 tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN; 139 __raw_writel(tmp, USB_OTG_STAT_CONTROL); 140 } 141 142 static int ohci_hcd_nxp_probe(struct platform_device *pdev) 143 { 144 struct usb_hcd *hcd = 0; 145 const struct hc_driver *driver = &ohci_nxp_hc_driver; 146 struct resource *res; 147 int ret = 0, irq; 148 struct device_node *isp1301_node; 149 150 if (pdev->dev.of_node) { 151 isp1301_node = of_parse_phandle(pdev->dev.of_node, 152 "transceiver", 0); 153 } else { 154 isp1301_node = NULL; 155 } 156 157 isp1301_i2c_client = isp1301_get_client(isp1301_node); 158 if (!isp1301_i2c_client) { 159 return -EPROBE_DEFER; 160 } 161 162 ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 163 if (ret) 164 goto fail_disable; 165 166 dev_dbg(&pdev->dev, "%s: " DRIVER_DESC " (nxp)\n", hcd_name); 167 if (usb_disabled()) { 168 dev_err(&pdev->dev, "USB is disabled\n"); 169 ret = -ENODEV; 170 goto fail_disable; 171 } 172 173 /* Enable USB host clock */ 174 usb_host_clk = devm_clk_get(&pdev->dev, NULL); 175 if (IS_ERR(usb_host_clk)) { 176 dev_err(&pdev->dev, "failed to acquire USB OHCI clock\n"); 177 ret = PTR_ERR(usb_host_clk); 178 goto fail_disable; 179 } 180 181 ret = clk_prepare_enable(usb_host_clk); 182 if (ret < 0) { 183 dev_err(&pdev->dev, "failed to start USB OHCI clock\n"); 184 goto fail_disable; 185 } 186 187 isp1301_configure(); 188 189 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); 190 if (!hcd) { 191 dev_err(&pdev->dev, "Failed to allocate HC buffer\n"); 192 ret = -ENOMEM; 193 goto fail_hcd; 194 } 195 196 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 197 hcd->regs = devm_ioremap_resource(&pdev->dev, res); 198 if (IS_ERR(hcd->regs)) { 199 ret = PTR_ERR(hcd->regs); 200 goto fail_resource; 201 } 202 hcd->rsrc_start = res->start; 203 hcd->rsrc_len = resource_size(res); 204 205 irq = platform_get_irq(pdev, 0); 206 if (irq < 0) { 207 ret = -ENXIO; 208 goto fail_resource; 209 } 210 211 ohci_nxp_start_hc(); 212 platform_set_drvdata(pdev, hcd); 213 214 dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq); 215 ret = usb_add_hcd(hcd, irq, 0); 216 if (ret == 0) { 217 device_wakeup_enable(hcd->self.controller); 218 return ret; 219 } 220 221 ohci_nxp_stop_hc(); 222 fail_resource: 223 usb_put_hcd(hcd); 224 fail_hcd: 225 clk_disable_unprepare(usb_host_clk); 226 fail_disable: 227 isp1301_i2c_client = NULL; 228 return ret; 229 } 230 231 static int ohci_hcd_nxp_remove(struct platform_device *pdev) 232 { 233 struct usb_hcd *hcd = platform_get_drvdata(pdev); 234 235 usb_remove_hcd(hcd); 236 ohci_nxp_stop_hc(); 237 usb_put_hcd(hcd); 238 clk_disable_unprepare(usb_host_clk); 239 isp1301_i2c_client = NULL; 240 241 return 0; 242 } 243 244 /* work with hotplug and coldplug */ 245 MODULE_ALIAS("platform:usb-ohci"); 246 247 #ifdef CONFIG_OF 248 static const struct of_device_id ohci_hcd_nxp_match[] = { 249 { .compatible = "nxp,ohci-nxp" }, 250 {}, 251 }; 252 MODULE_DEVICE_TABLE(of, ohci_hcd_nxp_match); 253 #endif 254 255 static struct platform_driver ohci_hcd_nxp_driver = { 256 .driver = { 257 .name = "usb-ohci", 258 .of_match_table = of_match_ptr(ohci_hcd_nxp_match), 259 }, 260 .probe = ohci_hcd_nxp_probe, 261 .remove = ohci_hcd_nxp_remove, 262 }; 263 264 static int __init ohci_nxp_init(void) 265 { 266 if (usb_disabled()) 267 return -ENODEV; 268 269 pr_info("%s: " DRIVER_DESC "\n", hcd_name); 270 271 ohci_init_driver(&ohci_nxp_hc_driver, NULL); 272 return platform_driver_register(&ohci_hcd_nxp_driver); 273 } 274 module_init(ohci_nxp_init); 275 276 static void __exit ohci_nxp_cleanup(void) 277 { 278 platform_driver_unregister(&ohci_hcd_nxp_driver); 279 } 280 module_exit(ohci_nxp_cleanup); 281 282 MODULE_DESCRIPTION(DRIVER_DESC); 283 MODULE_LICENSE("GPL v2"); 284