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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/kernel.h>
 26 #include <linux/module.h>
 27 #include <linux/of.h>
 28 #include <linux/platform_device.h>
 29 #include <linux/usb/isp1301.h>
 30 #include <linux/usb.h>
 31 #include <linux/usb/hcd.h>
 32 
 33 #include "ohci.h"
 34 
 35 
 36 #include <mach/hardware.h>
 37 #include <asm/mach-types.h>
 38 #include <asm/io.h>
 39 
 40 #include <mach/platform.h>
 41 #include <mach/irqs.h>
 42 
 43 #define USB_CONFIG_BASE         0x31020000
 44 #define PWRMAN_BASE             0x40004000
 45 
 46 #define USB_CTRL                IO_ADDRESS(PWRMAN_BASE + 0x64)
 47 
 48 /* USB_CTRL bit defines */
 49 #define USB_SLAVE_HCLK_EN       (1 << 24)
 50 #define USB_DEV_NEED_CLK_EN     (1 << 22)
 51 #define USB_HOST_NEED_CLK_EN    (1 << 21)
 52 #define PAD_CONTROL_LAST_DRIVEN (1 << 19)
 53 
 54 #define USB_OTG_STAT_CONTROL    IO_ADDRESS(USB_CONFIG_BASE + 0x110)
 55 
 56 /* USB_OTG_STAT_CONTROL bit defines */
 57 #define TRANSPARENT_I2C_EN      (1 << 7)
 58 #define HOST_EN                 (1 << 0)
 59 
 60 /* On LPC32xx, those are undefined */
 61 #ifndef start_int_set_falling_edge
 62 #define start_int_set_falling_edge(irq)
 63 #define start_int_set_rising_edge(irq)
 64 #define start_int_ack(irq)
 65 #define start_int_mask(irq)
 66 #define start_int_umask(irq)
 67 #endif
 68 
 69 #define DRIVER_DESC "OHCI NXP driver"
 70 
 71 static const char hcd_name[] = "ohci-nxp";
 72 static struct hc_driver __read_mostly ohci_nxp_hc_driver;
 73 
 74 static struct i2c_client *isp1301_i2c_client;
 75 
 76 extern int usb_disabled(void);
 77 
 78 static struct clk *usb_pll_clk;
 79 static struct clk *usb_dev_clk;
 80 static struct clk *usb_otg_clk;
 81 
 82 static void isp1301_configure_lpc32xx(void)
 83 {
 84         /* LPC32XX only supports DAT_SE0 USB mode */
 85         /* This sequence is important */
 86 
 87         /* Disable transparent UART mode first */
 88         i2c_smbus_write_byte_data(isp1301_i2c_client,
 89                 (ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
 90                 MC1_UART_EN);
 91         i2c_smbus_write_byte_data(isp1301_i2c_client,
 92                 (ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
 93                 ~MC1_SPEED_REG);
 94         i2c_smbus_write_byte_data(isp1301_i2c_client,
 95                                   ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
 96         i2c_smbus_write_byte_data(isp1301_i2c_client,
 97                   (ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR),
 98                   ~0);
 99         i2c_smbus_write_byte_data(isp1301_i2c_client,
100                 ISP1301_I2C_MODE_CONTROL_2,
101                 (MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL));
102         i2c_smbus_write_byte_data(isp1301_i2c_client,
103                 (ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR), ~0);
104         i2c_smbus_write_byte_data(isp1301_i2c_client,
105                 ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
106         i2c_smbus_write_byte_data(isp1301_i2c_client,
107                 ISP1301_I2C_OTG_CONTROL_1,
108                 (OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
109         i2c_smbus_write_byte_data(isp1301_i2c_client,
110                 (ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
111                 (OTG1_DM_PULLUP | OTG1_DP_PULLUP));
112         i2c_smbus_write_byte_data(isp1301_i2c_client,
113                 ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
114         i2c_smbus_write_byte_data(isp1301_i2c_client,
115                 ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR,
116                 ~0);
117         i2c_smbus_write_byte_data(isp1301_i2c_client,
118                 ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
119 
120         /* Enable usb_need_clk clock after transceiver is initialized */
121         __raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);
122 
123         printk(KERN_INFO "ISP1301 Vendor ID  : 0x%04x\n",
124               i2c_smbus_read_word_data(isp1301_i2c_client, 0x00));
125         printk(KERN_INFO "ISP1301 Product ID : 0x%04x\n",
126               i2c_smbus_read_word_data(isp1301_i2c_client, 0x02));
127         printk(KERN_INFO "ISP1301 Version ID : 0x%04x\n",
128               i2c_smbus_read_word_data(isp1301_i2c_client, 0x14));
129 }
130 
131 static void isp1301_configure(void)
132 {
133         isp1301_configure_lpc32xx();
134 }
135 
136 static inline void isp1301_vbus_on(void)
137 {
138         i2c_smbus_write_byte_data(isp1301_i2c_client, ISP1301_I2C_OTG_CONTROL_1,
139                                   OTG1_VBUS_DRV);
140 }
141 
142 static inline void isp1301_vbus_off(void)
143 {
144         i2c_smbus_write_byte_data(isp1301_i2c_client,
145                 ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR,
146                 OTG1_VBUS_DRV);
147 }
148 
149 static void ohci_nxp_start_hc(void)
150 {
151         unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN;
152         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
153         isp1301_vbus_on();
154 }
155 
156 static void ohci_nxp_stop_hc(void)
157 {
158         unsigned long tmp;
159         isp1301_vbus_off();
160         tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN;
161         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
162 }
163 
164 static int ohci_hcd_nxp_probe(struct platform_device *pdev)
165 {
166         struct usb_hcd *hcd = 0;
167         const struct hc_driver *driver = &ohci_nxp_hc_driver;
168         struct resource *res;
169         int ret = 0, irq;
170         struct device_node *isp1301_node;
171 
172         if (pdev->dev.of_node) {
173                 isp1301_node = of_parse_phandle(pdev->dev.of_node,
174                                                 "transceiver", 0);
175         } else {
176                 isp1301_node = NULL;
177         }
178 
179         isp1301_i2c_client = isp1301_get_client(isp1301_node);
180         if (!isp1301_i2c_client) {
181                 return -EPROBE_DEFER;
182         }
183 
184         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
185         if (ret)
186                 goto fail_disable;
187 
188         dev_dbg(&pdev->dev, "%s: " DRIVER_DESC " (nxp)\n", hcd_name);
189         if (usb_disabled()) {
190                 dev_err(&pdev->dev, "USB is disabled\n");
191                 ret = -ENODEV;
192                 goto fail_disable;
193         }
194 
195         /* Enable AHB slave USB clock, needed for further USB clock control */
196         __raw_writel(USB_SLAVE_HCLK_EN | PAD_CONTROL_LAST_DRIVEN, USB_CTRL);
197 
198         /* Enable USB PLL */
199         usb_pll_clk = devm_clk_get(&pdev->dev, "ck_pll5");
200         if (IS_ERR(usb_pll_clk)) {
201                 dev_err(&pdev->dev, "failed to acquire USB PLL\n");
202                 ret = PTR_ERR(usb_pll_clk);
203                 goto fail_disable;
204         }
205 
206         ret = clk_enable(usb_pll_clk);
207         if (ret < 0) {
208                 dev_err(&pdev->dev, "failed to start USB PLL\n");
209                 goto fail_disable;
210         }
211 
212         ret = clk_set_rate(usb_pll_clk, 48000);
213         if (ret < 0) {
214                 dev_err(&pdev->dev, "failed to set USB clock rate\n");
215                 goto fail_rate;
216         }
217 
218         /* Enable USB device clock */
219         usb_dev_clk = devm_clk_get(&pdev->dev, "ck_usbd");
220         if (IS_ERR(usb_dev_clk)) {
221                 dev_err(&pdev->dev, "failed to acquire USB DEV Clock\n");
222                 ret = PTR_ERR(usb_dev_clk);
223                 goto fail_rate;
224         }
225 
226         ret = clk_enable(usb_dev_clk);
227         if (ret < 0) {
228                 dev_err(&pdev->dev, "failed to start USB DEV Clock\n");
229                 goto fail_rate;
230         }
231 
232         /* Enable USB otg clocks */
233         usb_otg_clk = devm_clk_get(&pdev->dev, "ck_usb_otg");
234         if (IS_ERR(usb_otg_clk)) {
235                 dev_err(&pdev->dev, "failed to acquire USB DEV Clock\n");
236                 ret = PTR_ERR(usb_otg_clk);
237                 goto fail_otg;
238         }
239 
240         __raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);
241 
242         ret = clk_enable(usb_otg_clk);
243         if (ret < 0) {
244                 dev_err(&pdev->dev, "failed to start USB DEV Clock\n");
245                 goto fail_otg;
246         }
247 
248         isp1301_configure();
249 
250         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
251         if (!hcd) {
252                 dev_err(&pdev->dev, "Failed to allocate HC buffer\n");
253                 ret = -ENOMEM;
254                 goto fail_hcd;
255         }
256 
257         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
258         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
259         if (IS_ERR(hcd->regs)) {
260                 ret = PTR_ERR(hcd->regs);
261                 goto fail_resource;
262         }
263         hcd->rsrc_start = res->start;
264         hcd->rsrc_len = resource_size(res);
265 
266         irq = platform_get_irq(pdev, 0);
267         if (irq < 0) {
268                 ret = -ENXIO;
269                 goto fail_resource;
270         }
271 
272         ohci_nxp_start_hc();
273         platform_set_drvdata(pdev, hcd);
274 
275         dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
276         ret = usb_add_hcd(hcd, irq, 0);
277         if (ret == 0) {
278                 device_wakeup_enable(hcd->self.controller);
279                 return ret;
280         }
281 
282         ohci_nxp_stop_hc();
283 fail_resource:
284         usb_put_hcd(hcd);
285 fail_hcd:
286         clk_disable(usb_otg_clk);
287 fail_otg:
288         clk_disable(usb_dev_clk);
289 fail_rate:
290         clk_disable(usb_pll_clk);
291 fail_disable:
292         isp1301_i2c_client = NULL;
293         return ret;
294 }
295 
296 static int ohci_hcd_nxp_remove(struct platform_device *pdev)
297 {
298         struct usb_hcd *hcd = platform_get_drvdata(pdev);
299 
300         usb_remove_hcd(hcd);
301         ohci_nxp_stop_hc();
302         usb_put_hcd(hcd);
303         clk_disable(usb_pll_clk);
304         clk_disable(usb_dev_clk);
305         i2c_unregister_device(isp1301_i2c_client);
306         isp1301_i2c_client = NULL;
307 
308         return 0;
309 }
310 
311 /* work with hotplug and coldplug */
312 MODULE_ALIAS("platform:usb-ohci");
313 
314 #ifdef CONFIG_OF
315 static const struct of_device_id ohci_hcd_nxp_match[] = {
316         { .compatible = "nxp,ohci-nxp" },
317         {},
318 };
319 MODULE_DEVICE_TABLE(of, ohci_hcd_nxp_match);
320 #endif
321 
322 static struct platform_driver ohci_hcd_nxp_driver = {
323         .driver = {
324                 .name = "usb-ohci",
325                 .owner  = THIS_MODULE,
326                 .of_match_table = of_match_ptr(ohci_hcd_nxp_match),
327         },
328         .probe = ohci_hcd_nxp_probe,
329         .remove = ohci_hcd_nxp_remove,
330 };
331 
332 static int __init ohci_nxp_init(void)
333 {
334         if (usb_disabled())
335                 return -ENODEV;
336 
337         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
338 
339         ohci_init_driver(&ohci_nxp_hc_driver, NULL);
340         return platform_driver_register(&ohci_hcd_nxp_driver);
341 }
342 module_init(ohci_nxp_init);
343 
344 static void __exit ohci_nxp_cleanup(void)
345 {
346         platform_driver_unregister(&ohci_hcd_nxp_driver);
347 }
348 module_exit(ohci_nxp_cleanup);
349 
350 MODULE_DESCRIPTION(DRIVER_DESC);
351 MODULE_LICENSE("GPL v2");
352 

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