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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 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 

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