tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * drivers/usb/host/ehci-pxa168.c
3 *
4 * Tanmay Upadhyay <tanmay.upadhyay@einfochips.com>
5 *
6 * Based on drivers/usb/host/ehci-orion.c
7 *
8 * This file is licensed under the terms of the GNU General Public
9 * License version 2. This program is licensed "as is" without any
10 * warranty of any kind, whether express or implied.
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/clk.h>
17#include <mach/pxa168.h>
18
19#define USB_PHY_CTRL_REG 0x4
20#define USB_PHY_PLL_REG 0x8
21#define USB_PHY_TX_REG 0xc
22
23#define FBDIV_SHIFT 4
24
25#define ICP_SHIFT 12
26#define ICP_15 2
27#define ICP_20 3
28#define ICP_25 4
29
30#define KVCO_SHIFT 15
31
32#define PLLCALI12_SHIFT 25
33#define CALI12_VDD 0
34#define CALI12_09 1
35#define CALI12_10 2
36#define CALI12_11 3
37
38#define PLLVDD12_SHIFT 27
39#define VDD12_VDD 0
40#define VDD12_10 1
41#define VDD12_11 2
42#define VDD12_12 3
43
44#define PLLVDD18_SHIFT 29
45#define VDD18_19 0
46#define VDD18_20 1
47#define VDD18_21 2
48#define VDD18_22 3
49
50
51#define PLL_READY (1 << 23)
52#define VCOCAL_START (1 << 21)
53#define REG_RCAL_START (1 << 12)
54
55struct pxa168_usb_drv_data {
56 struct ehci_hcd ehci;
57 struct clk *pxa168_usb_clk;
58 struct resource *usb_phy_res;
59 void __iomem *usb_phy_reg_base;
60};
61
62static int ehci_pxa168_setup(struct usb_hcd *hcd)
63{
64 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
65 int retval;
66
67 ehci_reset(ehci);
68 retval = ehci_halt(ehci);
69 if (retval)
70 return retval;
71
72 /*
73 * data structure init
74 */
75 retval = ehci_init(hcd);
76 if (retval)
77 return retval;
78
79 hcd->has_tt = 1;
80
81 ehci_port_power(ehci, 0);
82
83 return retval;
84}
85
86static const struct hc_driver ehci_pxa168_hc_driver = {
87 .description = hcd_name,
88 .product_desc = "Marvell PXA168 EHCI",
89 .hcd_priv_size = sizeof(struct pxa168_usb_drv_data),
90
91 /*
92 * generic hardware linkage
93 */
94 .irq = ehci_irq,
95 .flags = HCD_MEMORY | HCD_USB2,
96
97 /*
98 * basic lifecycle operations
99 */
100 .reset = ehci_pxa168_setup,
101 .start = ehci_run,
102 .stop = ehci_stop,
103 .shutdown = ehci_shutdown,
104
105 /*
106 * managing i/o requests and associated device resources
107 */
108 .urb_enqueue = ehci_urb_enqueue,
109 .urb_dequeue = ehci_urb_dequeue,
110 .endpoint_disable = ehci_endpoint_disable,
111 .endpoint_reset = ehci_endpoint_reset,
112
113 /*
114 * scheduling support
115 */
116 .get_frame_number = ehci_get_frame,
117
118 /*
119 * root hub support
120 */
121 .hub_status_data = ehci_hub_status_data,
122 .hub_control = ehci_hub_control,
123 .bus_suspend = ehci_bus_suspend,
124 .bus_resume = ehci_bus_resume,
125 .relinquish_port = ehci_relinquish_port,
126 .port_handed_over = ehci_port_handed_over,
127
128 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
129};
130
131static int pxa168_usb_phy_init(struct platform_device *pdev)
132{
133 struct resource *res;
134 void __iomem *usb_phy_reg_base;
135 struct pxa168_usb_pdata *pdata;
136 struct pxa168_usb_drv_data *drv_data;
137 struct usb_hcd *hcd = platform_get_drvdata(pdev);
138 unsigned long reg_val;
139 int pll_retry_cont = 10000, err = 0;
140
141 drv_data = (struct pxa168_usb_drv_data *)hcd->hcd_priv;
142 pdata = (struct pxa168_usb_pdata *)pdev->dev.platform_data;
143
144 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
145 if (!res) {
146 dev_err(&pdev->dev,
147 "Found HC with no PHY register addr. Check %s setup!\n",
148 dev_name(&pdev->dev));
149 return -ENODEV;
150 }
151
152 if (!request_mem_region(res->start, resource_size(res),
153 ehci_pxa168_hc_driver.description)) {
154 dev_dbg(&pdev->dev, "controller already in use\n");
155 return -EBUSY;
156 }
157
158 usb_phy_reg_base = ioremap(res->start, resource_size(res));
159 if (usb_phy_reg_base == NULL) {
160 dev_dbg(&pdev->dev, "error mapping memory\n");
161 err = -EFAULT;
162 goto err1;
163 }
164 drv_data->usb_phy_reg_base = usb_phy_reg_base;
165 drv_data->usb_phy_res = res;
166
167 /* If someone wants to init USB phy in board specific way */
168 if (pdata && pdata->phy_init)
169 return pdata->phy_init(usb_phy_reg_base);
170
171 /* Power up the PHY and PLL */
172 writel(readl(usb_phy_reg_base + USB_PHY_CTRL_REG) | 0x3,
173 usb_phy_reg_base + USB_PHY_CTRL_REG);
174
175 /* Configure PHY PLL */
176 reg_val = readl(usb_phy_reg_base + USB_PHY_PLL_REG) & ~(0x7e03ffff);
177 reg_val |= (VDD18_22 << PLLVDD18_SHIFT | VDD12_12 << PLLVDD12_SHIFT |
178 CALI12_11 << PLLCALI12_SHIFT | 3 << KVCO_SHIFT |
179 ICP_15 << ICP_SHIFT | 0xee << FBDIV_SHIFT | 0xb);
180 writel(reg_val, usb_phy_reg_base + USB_PHY_PLL_REG);
181
182 /* Make sure PHY PLL is ready */
183 while (!(readl(usb_phy_reg_base + USB_PHY_PLL_REG) & PLL_READY)) {
184 if (!(pll_retry_cont--)) {
185 dev_dbg(&pdev->dev, "USB PHY PLL not ready\n");
186 err = -EIO;
187 goto err2;
188 }
189 }
190
191 /* Toggle VCOCAL_START bit of U2PLL for PLL calibration */
192 udelay(200);
193 writel(readl(usb_phy_reg_base + USB_PHY_PLL_REG) | VCOCAL_START,
194 usb_phy_reg_base + USB_PHY_PLL_REG);
195 udelay(40);
196 writel(readl(usb_phy_reg_base + USB_PHY_PLL_REG) & ~VCOCAL_START,
197 usb_phy_reg_base + USB_PHY_PLL_REG);
198
199 /* Toggle REG_RCAL_START bit of U2PTX for impedance calibration */
200 udelay(400);
201 writel(readl(usb_phy_reg_base + USB_PHY_TX_REG) | REG_RCAL_START,
202 usb_phy_reg_base + USB_PHY_TX_REG);
203 udelay(40);
204 writel(readl(usb_phy_reg_base + USB_PHY_TX_REG) & ~REG_RCAL_START,
205 usb_phy_reg_base + USB_PHY_TX_REG);
206
207 /* Make sure PHY PLL is ready again */
208 pll_retry_cont = 0;
209 while (!(readl(usb_phy_reg_base + USB_PHY_PLL_REG) & PLL_READY)) {
210 if (!(pll_retry_cont--)) {
211 dev_dbg(&pdev->dev, "USB PHY PLL not ready\n");
212 err = -EIO;
213 goto err2;
214 }
215 }
216
217 return 0;
218err2:
219 iounmap(usb_phy_reg_base);
220err1:
221 release_mem_region(res->start, resource_size(res));
222 return err;
223}
224
225static int __devinit ehci_pxa168_drv_probe(struct platform_device *pdev)
226{
227 struct resource *res;
228 struct usb_hcd *hcd;
229 struct ehci_hcd *ehci;
230 struct pxa168_usb_drv_data *drv_data;
231 void __iomem *regs;
232 int irq, err = 0;
233
234 if (usb_disabled())
235 return -ENODEV;
236
237 pr_debug("Initializing pxa168-SoC USB Host Controller\n");
238
239 irq = platform_get_irq(pdev, 0);
240 if (irq <= 0) {
241 dev_err(&pdev->dev,
242 "Found HC with no IRQ. Check %s setup!\n",
243 dev_name(&pdev->dev));
244 err = -ENODEV;
245 goto err1;
246 }
247
248 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
249 if (!res) {
250 dev_err(&pdev->dev,
251 "Found HC with no register addr. Check %s setup!\n",
252 dev_name(&pdev->dev));
253 err = -ENODEV;
254 goto err1;
255 }
256
257 if (!request_mem_region(res->start, resource_size(res),
258 ehci_pxa168_hc_driver.description)) {
259 dev_dbg(&pdev->dev, "controller already in use\n");
260 err = -EBUSY;
261 goto err1;
262 }
263
264 regs = ioremap(res->start, resource_size(res));
265 if (regs == NULL) {
266 dev_dbg(&pdev->dev, "error mapping memory\n");
267 err = -EFAULT;
268 goto err2;
269 }
270
271 hcd = usb_create_hcd(&ehci_pxa168_hc_driver,
272 &pdev->dev, dev_name(&pdev->dev));
273 if (!hcd) {
274 err = -ENOMEM;
275 goto err3;
276 }
277
278 drv_data = (struct pxa168_usb_drv_data *)hcd->hcd_priv;
279
280 /* Enable USB clock */
281 drv_data->pxa168_usb_clk = clk_get(&pdev->dev, "PXA168-USBCLK");
282 if (IS_ERR(drv_data->pxa168_usb_clk)) {
283 dev_err(&pdev->dev, "Couldn't get USB clock\n");
284 err = PTR_ERR(drv_data->pxa168_usb_clk);
285 goto err4;
286 }
287 clk_enable(drv_data->pxa168_usb_clk);
288
289 err = pxa168_usb_phy_init(pdev);
290 if (err) {
291 dev_err(&pdev->dev, "USB PHY initialization failed\n");
292 goto err5;
293 }
294
295 hcd->rsrc_start = res->start;
296 hcd->rsrc_len = resource_size(res);
297 hcd->regs = regs;
298
299 ehci = hcd_to_ehci(hcd);
300 ehci->caps = hcd->regs + 0x100;
301 ehci->regs = hcd->regs + 0x100 +
302 HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
303 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
304 hcd->has_tt = 1;
305 ehci->sbrn = 0x20;
306
307 err = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_DISABLED);
308 if (err)
309 goto err5;
310
311 return 0;
312
313err5:
314 clk_disable(drv_data->pxa168_usb_clk);
315 clk_put(drv_data->pxa168_usb_clk);
316err4:
317 usb_put_hcd(hcd);
318err3:
319 iounmap(regs);
320err2:
321 release_mem_region(res->start, resource_size(res));
322err1:
323 dev_err(&pdev->dev, "init %s fail, %d\n",
324 dev_name(&pdev->dev), err);
325
326 return err;
327}
328
329static int __exit ehci_pxa168_drv_remove(struct platform_device *pdev)
330{
331 struct usb_hcd *hcd = platform_get_drvdata(pdev);
332 struct pxa168_usb_drv_data *drv_data =
333 (struct pxa168_usb_drv_data *)hcd->hcd_priv;
334
335 usb_remove_hcd(hcd);
336
337 /* Power down PHY & PLL */
338 writel(readl(drv_data->usb_phy_reg_base + USB_PHY_CTRL_REG) & (~0x3),
339 drv_data->usb_phy_reg_base + USB_PHY_CTRL_REG);
340
341 clk_disable(drv_data->pxa168_usb_clk);
342 clk_put(drv_data->pxa168_usb_clk);
343
344 iounmap(hcd->regs);
345 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
346
347 iounmap(drv_data->usb_phy_reg_base);
348 release_mem_region(drv_data->usb_phy_res->start,
349 resource_size(drv_data->usb_phy_res));
350
351 usb_put_hcd(hcd);
352
353 return 0;
354}
355
356MODULE_ALIAS("platform:pxa168-ehci");
357
358static struct platform_driver ehci_pxa168_driver = {
359 .probe = ehci_pxa168_drv_probe,
360 .remove = __exit_p(ehci_pxa168_drv_remove),
361 .shutdown = usb_hcd_platform_shutdown,
362 .driver.name = "pxa168-ehci",
363};