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Linux/drivers/usb/host/fsl-mph-dr-of.c

  1 /*
  2  * Setup platform devices needed by the Freescale multi-port host
  3  * and/or dual-role USB controller modules based on the description
  4  * in flat device tree.
  5  *
  6  * This program is free software; you can redistribute  it and/or modify it
  7  * under  the terms of  the GNU General  Public License as published by the
  8  * Free Software Foundation;  either version 2 of the  License, or (at your
  9  * option) any later version.
 10  */
 11 
 12 #include <linux/kernel.h>
 13 #include <linux/platform_device.h>
 14 #include <linux/fsl_devices.h>
 15 #include <linux/err.h>
 16 #include <linux/io.h>
 17 #include <linux/of_platform.h>
 18 #include <linux/clk.h>
 19 #include <linux/module.h>
 20 
 21 struct fsl_usb2_dev_data {
 22         char *dr_mode;          /* controller mode */
 23         char *drivers[3];       /* drivers to instantiate for this mode */
 24         enum fsl_usb2_operating_modes op_mode;  /* operating mode */
 25 };
 26 
 27 static struct fsl_usb2_dev_data dr_mode_data[] = {
 28         {
 29                 .dr_mode = "host",
 30                 .drivers = { "fsl-ehci", NULL, NULL, },
 31                 .op_mode = FSL_USB2_DR_HOST,
 32         },
 33         {
 34                 .dr_mode = "otg",
 35                 .drivers = { "fsl-usb2-otg", "fsl-ehci", "fsl-usb2-udc", },
 36                 .op_mode = FSL_USB2_DR_OTG,
 37         },
 38         {
 39                 .dr_mode = "peripheral",
 40                 .drivers = { "fsl-usb2-udc", NULL, NULL, },
 41                 .op_mode = FSL_USB2_DR_DEVICE,
 42         },
 43 };
 44 
 45 static struct fsl_usb2_dev_data *get_dr_mode_data(struct device_node *np)
 46 {
 47         const unsigned char *prop;
 48         int i;
 49 
 50         prop = of_get_property(np, "dr_mode", NULL);
 51         if (prop) {
 52                 for (i = 0; i < ARRAY_SIZE(dr_mode_data); i++) {
 53                         if (!strcmp(prop, dr_mode_data[i].dr_mode))
 54                                 return &dr_mode_data[i];
 55                 }
 56         }
 57         pr_warn("%s: Invalid 'dr_mode' property, fallback to host mode\n",
 58                 np->full_name);
 59         return &dr_mode_data[0]; /* mode not specified, use host */
 60 }
 61 
 62 static enum fsl_usb2_phy_modes determine_usb_phy(const char *phy_type)
 63 {
 64         if (!phy_type)
 65                 return FSL_USB2_PHY_NONE;
 66         if (!strcasecmp(phy_type, "ulpi"))
 67                 return FSL_USB2_PHY_ULPI;
 68         if (!strcasecmp(phy_type, "utmi"))
 69                 return FSL_USB2_PHY_UTMI;
 70         if (!strcasecmp(phy_type, "utmi_wide"))
 71                 return FSL_USB2_PHY_UTMI_WIDE;
 72         if (!strcasecmp(phy_type, "serial"))
 73                 return FSL_USB2_PHY_SERIAL;
 74 
 75         return FSL_USB2_PHY_NONE;
 76 }
 77 
 78 static struct platform_device *fsl_usb2_device_register(
 79                                         struct platform_device *ofdev,
 80                                         struct fsl_usb2_platform_data *pdata,
 81                                         const char *name, int id)
 82 {
 83         struct platform_device *pdev;
 84         const struct resource *res = ofdev->resource;
 85         unsigned int num = ofdev->num_resources;
 86         int retval;
 87 
 88         pdev = platform_device_alloc(name, id);
 89         if (!pdev) {
 90                 retval = -ENOMEM;
 91                 goto error;
 92         }
 93 
 94         pdev->dev.parent = &ofdev->dev;
 95 
 96         pdev->dev.coherent_dma_mask = ofdev->dev.coherent_dma_mask;
 97         *pdev->dev.dma_mask = *ofdev->dev.dma_mask;
 98 
 99         retval = platform_device_add_data(pdev, pdata, sizeof(*pdata));
100         if (retval)
101                 goto error;
102 
103         if (num) {
104                 retval = platform_device_add_resources(pdev, res, num);
105                 if (retval)
106                         goto error;
107         }
108 
109         retval = platform_device_add(pdev);
110         if (retval)
111                 goto error;
112 
113         return pdev;
114 
115 error:
116         platform_device_put(pdev);
117         return ERR_PTR(retval);
118 }
119 
120 static const struct of_device_id fsl_usb2_mph_dr_of_match[];
121 
122 static int usb_get_ver_info(struct device_node *np)
123 {
124         int ver = -1;
125 
126         /*
127          * returns 1 for usb controller version 1.6
128          * returns 2 for usb controller version 2.2
129          * returns 0 otherwise
130          */
131         if (of_device_is_compatible(np, "fsl-usb2-dr")) {
132                 if (of_device_is_compatible(np, "fsl-usb2-dr-v1.6"))
133                         ver = FSL_USB_VER_1_6;
134                 else if (of_device_is_compatible(np, "fsl-usb2-dr-v2.2"))
135                         ver = FSL_USB_VER_2_2;
136                 else if (of_device_is_compatible(np, "fsl-usb2-dr-v2.4"))
137                         ver = FSL_USB_VER_2_4;
138                 else /* for previous controller versions */
139                         ver = FSL_USB_VER_OLD;
140 
141                 if (ver > -1)
142                         return ver;
143         }
144 
145         if (of_device_is_compatible(np, "fsl,mpc5121-usb2-dr"))
146                 return FSL_USB_VER_OLD;
147 
148         if (of_device_is_compatible(np, "fsl-usb2-mph")) {
149                 if (of_device_is_compatible(np, "fsl-usb2-mph-v1.6"))
150                         ver = FSL_USB_VER_1_6;
151                 else if (of_device_is_compatible(np, "fsl-usb2-mph-v2.2"))
152                         ver = FSL_USB_VER_2_2;
153                 else /* for previous controller versions */
154                         ver = FSL_USB_VER_OLD;
155         }
156 
157         return ver;
158 }
159 
160 static int fsl_usb2_mph_dr_of_probe(struct platform_device *ofdev)
161 {
162         struct device_node *np = ofdev->dev.of_node;
163         struct platform_device *usb_dev;
164         struct fsl_usb2_platform_data data, *pdata;
165         struct fsl_usb2_dev_data *dev_data;
166         const struct of_device_id *match;
167         const unsigned char *prop;
168         static unsigned int idx;
169         int i;
170 
171         if (!of_device_is_available(np))
172                 return -ENODEV;
173 
174         match = of_match_device(fsl_usb2_mph_dr_of_match, &ofdev->dev);
175         if (!match)
176                 return -ENODEV;
177 
178         pdata = &data;
179         if (match->data)
180                 memcpy(pdata, match->data, sizeof(data));
181         else
182                 memset(pdata, 0, sizeof(data));
183 
184         dev_data = get_dr_mode_data(np);
185 
186         if (of_device_is_compatible(np, "fsl-usb2-mph")) {
187                 if (of_get_property(np, "port0", NULL))
188                         pdata->port_enables |= FSL_USB2_PORT0_ENABLED;
189 
190                 if (of_get_property(np, "port1", NULL))
191                         pdata->port_enables |= FSL_USB2_PORT1_ENABLED;
192 
193                 pdata->operating_mode = FSL_USB2_MPH_HOST;
194         } else {
195                 if (of_get_property(np, "fsl,invert-drvvbus", NULL))
196                         pdata->invert_drvvbus = 1;
197 
198                 if (of_get_property(np, "fsl,invert-pwr-fault", NULL))
199                         pdata->invert_pwr_fault = 1;
200 
201                 /* setup mode selected in the device tree */
202                 pdata->operating_mode = dev_data->op_mode;
203         }
204 
205         prop = of_get_property(np, "phy_type", NULL);
206         pdata->phy_mode = determine_usb_phy(prop);
207         pdata->controller_ver = usb_get_ver_info(np);
208 
209         if (pdata->have_sysif_regs) {
210                 if (pdata->controller_ver < 0) {
211                         dev_warn(&ofdev->dev, "Could not get controller version\n");
212                         return -ENODEV;
213                 }
214         }
215 
216         for (i = 0; i < ARRAY_SIZE(dev_data->drivers); i++) {
217                 if (!dev_data->drivers[i])
218                         continue;
219                 usb_dev = fsl_usb2_device_register(ofdev, pdata,
220                                         dev_data->drivers[i], idx);
221                 if (IS_ERR(usb_dev)) {
222                         dev_err(&ofdev->dev, "Can't register usb device\n");
223                         return PTR_ERR(usb_dev);
224                 }
225         }
226         idx++;
227         return 0;
228 }
229 
230 static int __unregister_subdev(struct device *dev, void *d)
231 {
232         platform_device_unregister(to_platform_device(dev));
233         return 0;
234 }
235 
236 static int fsl_usb2_mph_dr_of_remove(struct platform_device *ofdev)
237 {
238         device_for_each_child(&ofdev->dev, NULL, __unregister_subdev);
239         return 0;
240 }
241 
242 #ifdef CONFIG_PPC_MPC512x
243 
244 #define USBGENCTRL              0x200           /* NOTE: big endian */
245 #define GC_WU_INT_CLR           (1 << 5)        /* Wakeup int clear */
246 #define GC_ULPI_SEL             (1 << 4)        /* ULPI i/f select (usb0 only)*/
247 #define GC_PPP                  (1 << 3)        /* Inv. Port Power Polarity */
248 #define GC_PFP                  (1 << 2)        /* Inv. Power Fault Polarity */
249 #define GC_WU_ULPI_EN           (1 << 1)        /* Wakeup on ULPI event */
250 #define GC_WU_IE                (1 << 1)        /* Wakeup interrupt enable */
251 
252 #define ISIPHYCTRL              0x204           /* NOTE: big endian */
253 #define PHYCTRL_PHYE            (1 << 4)        /* On-chip UTMI PHY enable */
254 #define PHYCTRL_BSENH           (1 << 3)        /* Bit Stuff Enable High */
255 #define PHYCTRL_BSEN            (1 << 2)        /* Bit Stuff Enable */
256 #define PHYCTRL_LSFE            (1 << 1)        /* Line State Filter Enable */
257 #define PHYCTRL_PXE             (1 << 0)        /* PHY oscillator enable */
258 
259 int fsl_usb2_mpc5121_init(struct platform_device *pdev)
260 {
261         struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev);
262         struct clk *clk;
263         int err;
264 
265         clk = devm_clk_get(pdev->dev.parent, "ipg");
266         if (IS_ERR(clk)) {
267                 dev_err(&pdev->dev, "failed to get clk\n");
268                 return PTR_ERR(clk);
269         }
270         err = clk_prepare_enable(clk);
271         if (err) {
272                 dev_err(&pdev->dev, "failed to enable clk\n");
273                 return err;
274         }
275         pdata->clk = clk;
276 
277         if (pdata->phy_mode == FSL_USB2_PHY_UTMI_WIDE) {
278                 u32 reg = 0;
279 
280                 if (pdata->invert_drvvbus)
281                         reg |= GC_PPP;
282 
283                 if (pdata->invert_pwr_fault)
284                         reg |= GC_PFP;
285 
286                 out_be32(pdata->regs + ISIPHYCTRL, PHYCTRL_PHYE | PHYCTRL_PXE);
287                 out_be32(pdata->regs + USBGENCTRL, reg);
288         }
289         return 0;
290 }
291 
292 static void fsl_usb2_mpc5121_exit(struct platform_device *pdev)
293 {
294         struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev);
295 
296         pdata->regs = NULL;
297 
298         if (pdata->clk)
299                 clk_disable_unprepare(pdata->clk);
300 }
301 
302 static struct fsl_usb2_platform_data fsl_usb2_mpc5121_pd = {
303         .big_endian_desc = 1,
304         .big_endian_mmio = 1,
305         .es = 1,
306         .have_sysif_regs = 0,
307         .le_setup_buf = 1,
308         .init = fsl_usb2_mpc5121_init,
309         .exit = fsl_usb2_mpc5121_exit,
310 };
311 #endif /* CONFIG_PPC_MPC512x */
312 
313 static struct fsl_usb2_platform_data fsl_usb2_mpc8xxx_pd = {
314         .have_sysif_regs = 1,
315 };
316 
317 static const struct of_device_id fsl_usb2_mph_dr_of_match[] = {
318         { .compatible = "fsl-usb2-mph", .data = &fsl_usb2_mpc8xxx_pd, },
319         { .compatible = "fsl-usb2-dr", .data = &fsl_usb2_mpc8xxx_pd, },
320 #ifdef CONFIG_PPC_MPC512x
321         { .compatible = "fsl,mpc5121-usb2-dr", .data = &fsl_usb2_mpc5121_pd, },
322 #endif
323         {},
324 };
325 
326 static struct platform_driver fsl_usb2_mph_dr_driver = {
327         .driver = {
328                 .name = "fsl-usb2-mph-dr",
329                 .owner = THIS_MODULE,
330                 .of_match_table = fsl_usb2_mph_dr_of_match,
331         },
332         .probe  = fsl_usb2_mph_dr_of_probe,
333         .remove = fsl_usb2_mph_dr_of_remove,
334 };
335 
336 module_platform_driver(fsl_usb2_mph_dr_driver);
337 
338 MODULE_DESCRIPTION("FSL MPH DR OF devices driver");
339 MODULE_AUTHOR("Anatolij Gustschin <agust@denx.de>");
340 MODULE_LICENSE("GPL");
341 

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