Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/drivers/usb/host/ohci-nxp.c

  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 static struct clk *usb_host_clk;
 60 
 61 static void isp1301_configure_lpc32xx(void)
 62 {
 63         /* LPC32XX only supports DAT_SE0 USB mode */
 64         /* This sequence is important */
 65 
 66         /* Disable transparent UART mode first */
 67         i2c_smbus_write_byte_data(isp1301_i2c_client,
 68                 (ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
 69                 MC1_UART_EN);
 70         i2c_smbus_write_byte_data(isp1301_i2c_client,
 71                 (ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
 72                 ~MC1_SPEED_REG);
 73         i2c_smbus_write_byte_data(isp1301_i2c_client,
 74                                   ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
 75         i2c_smbus_write_byte_data(isp1301_i2c_client,
 76                   (ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR),
 77                   ~0);
 78         i2c_smbus_write_byte_data(isp1301_i2c_client,
 79                 ISP1301_I2C_MODE_CONTROL_2,
 80                 (MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL));
 81         i2c_smbus_write_byte_data(isp1301_i2c_client,
 82                 (ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR), ~0);
 83         i2c_smbus_write_byte_data(isp1301_i2c_client,
 84                 ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
 85         i2c_smbus_write_byte_data(isp1301_i2c_client,
 86                 ISP1301_I2C_OTG_CONTROL_1,
 87                 (OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
 88         i2c_smbus_write_byte_data(isp1301_i2c_client,
 89                 (ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
 90                 (OTG1_DM_PULLUP | OTG1_DP_PULLUP));
 91         i2c_smbus_write_byte_data(isp1301_i2c_client,
 92                 ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
 93         i2c_smbus_write_byte_data(isp1301_i2c_client,
 94                 ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR,
 95                 ~0);
 96         i2c_smbus_write_byte_data(isp1301_i2c_client,
 97                 ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
 98 
 99         printk(KERN_INFO "ISP1301 Vendor ID  : 0x%04x\n",
100               i2c_smbus_read_word_data(isp1301_i2c_client, 0x00));
101         printk(KERN_INFO "ISP1301 Product ID : 0x%04x\n",
102               i2c_smbus_read_word_data(isp1301_i2c_client, 0x02));
103         printk(KERN_INFO "ISP1301 Version ID : 0x%04x\n",
104               i2c_smbus_read_word_data(isp1301_i2c_client, 0x14));
105 }
106 
107 static void isp1301_configure(void)
108 {
109         isp1301_configure_lpc32xx();
110 }
111 
112 static inline void isp1301_vbus_on(void)
113 {
114         i2c_smbus_write_byte_data(isp1301_i2c_client, ISP1301_I2C_OTG_CONTROL_1,
115                                   OTG1_VBUS_DRV);
116 }
117 
118 static inline void isp1301_vbus_off(void)
119 {
120         i2c_smbus_write_byte_data(isp1301_i2c_client,
121                 ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR,
122                 OTG1_VBUS_DRV);
123 }
124 
125 static void ohci_nxp_start_hc(void)
126 {
127         unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN;
128 
129         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
130         isp1301_vbus_on();
131 }
132 
133 static void ohci_nxp_stop_hc(void)
134 {
135         unsigned long tmp;
136 
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         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
162         if (ret)
163                 goto fail_disable;
164 
165         dev_dbg(&pdev->dev, "%s: " DRIVER_DESC " (nxp)\n", hcd_name);
166         if (usb_disabled()) {
167                 dev_err(&pdev->dev, "USB is disabled\n");
168                 ret = -ENODEV;
169                 goto fail_disable;
170         }
171 
172         /* Enable USB host clock */
173         usb_host_clk = devm_clk_get(&pdev->dev, NULL);
174         if (IS_ERR(usb_host_clk)) {
175                 dev_err(&pdev->dev, "failed to acquire USB OHCI clock\n");
176                 ret = PTR_ERR(usb_host_clk);
177                 goto fail_disable;
178         }
179 
180         ret = clk_prepare_enable(usb_host_clk);
181         if (ret < 0) {
182                 dev_err(&pdev->dev, "failed to start USB OHCI clock\n");
183                 goto fail_disable;
184         }
185 
186         isp1301_configure();
187 
188         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
189         if (!hcd) {
190                 dev_err(&pdev->dev, "Failed to allocate HC buffer\n");
191                 ret = -ENOMEM;
192                 goto fail_hcd;
193         }
194 
195         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
196         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
197         if (IS_ERR(hcd->regs)) {
198                 ret = PTR_ERR(hcd->regs);
199                 goto fail_resource;
200         }
201         hcd->rsrc_start = res->start;
202         hcd->rsrc_len = resource_size(res);
203 
204         irq = platform_get_irq(pdev, 0);
205         if (irq < 0) {
206                 ret = -ENXIO;
207                 goto fail_resource;
208         }
209 
210         ohci_nxp_start_hc();
211         platform_set_drvdata(pdev, hcd);
212 
213         dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
214         ret = usb_add_hcd(hcd, irq, 0);
215         if (ret == 0) {
216                 device_wakeup_enable(hcd->self.controller);
217                 return ret;
218         }
219 
220         ohci_nxp_stop_hc();
221 fail_resource:
222         usb_put_hcd(hcd);
223 fail_hcd:
224         clk_disable_unprepare(usb_host_clk);
225 fail_disable:
226         isp1301_i2c_client = NULL;
227         return ret;
228 }
229 
230 static int ohci_hcd_nxp_remove(struct platform_device *pdev)
231 {
232         struct usb_hcd *hcd = platform_get_drvdata(pdev);
233 
234         usb_remove_hcd(hcd);
235         ohci_nxp_stop_hc();
236         usb_put_hcd(hcd);
237         clk_disable_unprepare(usb_host_clk);
238         isp1301_i2c_client = NULL;
239 
240         return 0;
241 }
242 
243 /* work with hotplug and coldplug */
244 MODULE_ALIAS("platform:usb-ohci");
245 
246 #ifdef CONFIG_OF
247 static const struct of_device_id ohci_hcd_nxp_match[] = {
248         { .compatible = "nxp,ohci-nxp" },
249         {},
250 };
251 MODULE_DEVICE_TABLE(of, ohci_hcd_nxp_match);
252 #endif
253 
254 static struct platform_driver ohci_hcd_nxp_driver = {
255         .driver = {
256                 .name = "usb-ohci",
257                 .of_match_table = of_match_ptr(ohci_hcd_nxp_match),
258         },
259         .probe = ohci_hcd_nxp_probe,
260         .remove = ohci_hcd_nxp_remove,
261 };
262 
263 static int __init ohci_nxp_init(void)
264 {
265         if (usb_disabled())
266                 return -ENODEV;
267 
268         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
269 
270         ohci_init_driver(&ohci_nxp_hc_driver, NULL);
271         return platform_driver_register(&ohci_hcd_nxp_driver);
272 }
273 module_init(ohci_nxp_init);
274 
275 static void __exit ohci_nxp_cleanup(void)
276 {
277         platform_driver_unregister(&ohci_hcd_nxp_driver);
278 }
279 module_exit(ohci_nxp_cleanup);
280 
281 MODULE_DESCRIPTION(DRIVER_DESC);
282 MODULE_LICENSE("GPL v2");
283 

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