2 * drivers/usb/host/ehci-pxa168.c
4 * Tanmay Upadhyay <tanmay.upadhyay@einfochips.com>
6 * Based on drivers/usb/host/ehci-orion.c
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.
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>
19 #define USB_PHY_CTRL_REG 0x4
20 #define USB_PHY_PLL_REG 0x8
21 #define USB_PHY_TX_REG 0xc
32 #define PLLCALI12_SHIFT 25
38 #define PLLVDD12_SHIFT 27
44 #define PLLVDD18_SHIFT 29
51 #define PLL_READY (1 << 23)
52 #define VCOCAL_START (1 << 21)
53 #define REG_RCAL_START (1 << 12)
55 struct pxa168_usb_drv_data {
57 struct clk *pxa168_usb_clk;
58 struct resource *usb_phy_res;
59 void __iomem *usb_phy_reg_base;
62 static int ehci_pxa168_setup(struct usb_hcd *hcd)
64 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
68 retval = ehci_halt(ehci);
75 retval = ehci_init(hcd);
81 ehci_port_power(ehci, 0);
86 static 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),
92 * generic hardware linkage
95 .flags = HCD_MEMORY | HCD_USB2,
98 * basic lifecycle operations
100 .reset = ehci_pxa168_setup,
103 .shutdown = ehci_shutdown,
106 * managing i/o requests and associated device resources
108 .urb_enqueue = ehci_urb_enqueue,
109 .urb_dequeue = ehci_urb_dequeue,
110 .endpoint_disable = ehci_endpoint_disable,
111 .endpoint_reset = ehci_endpoint_reset,
116 .get_frame_number = ehci_get_frame,
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,
128 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
131 static int pxa168_usb_phy_init(struct platform_device *pdev)
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;
141 drv_data = (struct pxa168_usb_drv_data *)hcd->hcd_priv;
142 pdata = (struct pxa168_usb_pdata *)pdev->dev.platform_data;
144 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
147 "Found HC with no PHY register addr. Check %s setup!\n",
148 dev_name(&pdev->dev));
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");
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");
164 drv_data->usb_phy_reg_base = usb_phy_reg_base;
165 drv_data->usb_phy_res = res;
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);
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);
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);
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");
191 /* Toggle VCOCAL_START bit of U2PLL for PLL calibration */
193 writel(readl(usb_phy_reg_base + USB_PHY_PLL_REG) | VCOCAL_START,
194 usb_phy_reg_base + USB_PHY_PLL_REG);
196 writel(readl(usb_phy_reg_base + USB_PHY_PLL_REG) & ~VCOCAL_START,
197 usb_phy_reg_base + USB_PHY_PLL_REG);
199 /* Toggle REG_RCAL_START bit of U2PTX for impedance calibration */
201 writel(readl(usb_phy_reg_base + USB_PHY_TX_REG) | REG_RCAL_START,
202 usb_phy_reg_base + USB_PHY_TX_REG);
204 writel(readl(usb_phy_reg_base + USB_PHY_TX_REG) & ~REG_RCAL_START,
205 usb_phy_reg_base + USB_PHY_TX_REG);
207 /* Make sure PHY PLL is ready again */
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");
219 iounmap(usb_phy_reg_base);
221 release_mem_region(res->start, resource_size(res));
225 static int __devinit ehci_pxa168_drv_probe(struct platform_device *pdev)
227 struct resource *res;
229 struct ehci_hcd *ehci;
230 struct pxa168_usb_drv_data *drv_data;
237 pr_debug("Initializing pxa168-SoC USB Host Controller\n");
239 irq = platform_get_irq(pdev, 0);
242 "Found HC with no IRQ. Check %s setup!\n",
243 dev_name(&pdev->dev));
248 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
251 "Found HC with no register addr. Check %s setup!\n",
252 dev_name(&pdev->dev));
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");
264 regs = ioremap(res->start, resource_size(res));
266 dev_dbg(&pdev->dev, "error mapping memory\n");
271 hcd = usb_create_hcd(&ehci_pxa168_hc_driver,
272 &pdev->dev, dev_name(&pdev->dev));
278 drv_data = (struct pxa168_usb_drv_data *)hcd->hcd_priv;
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);
287 clk_enable(drv_data->pxa168_usb_clk);
289 err = pxa168_usb_phy_init(pdev);
291 dev_err(&pdev->dev, "USB PHY initialization failed\n");
295 hcd->rsrc_start = res->start;
296 hcd->rsrc_len = resource_size(res);
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);
307 err = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_DISABLED);
314 clk_disable(drv_data->pxa168_usb_clk);
315 clk_put(drv_data->pxa168_usb_clk);
321 release_mem_region(res->start, resource_size(res));
323 dev_err(&pdev->dev, "init %s fail, %d\n",
324 dev_name(&pdev->dev), err);
329 static int __exit ehci_pxa168_drv_remove(struct platform_device *pdev)
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;
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);
341 clk_disable(drv_data->pxa168_usb_clk);
342 clk_put(drv_data->pxa168_usb_clk);
345 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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));
356 MODULE_ALIAS("platform:pxa168-ehci");
358 static 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",