Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/usb/host/ehci-orion.c

  1 /*
  2  * drivers/usb/host/ehci-orion.c
  3  *
  4  * Tzachi Perelstein <tzachi@marvell.com>
  5  *
  6  * This file is licensed under  the terms of the GNU General Public
  7  * License version 2. This program is licensed "as is" without any
  8  * warranty of any kind, whether express or implied.
  9  */
 10 
 11 #include <linux/kernel.h>
 12 #include <linux/module.h>
 13 #include <linux/platform_device.h>
 14 #include <linux/mbus.h>
 15 #include <linux/clk.h>
 16 #include <linux/platform_data/usb-ehci-orion.h>
 17 #include <linux/of.h>
 18 #include <linux/phy/phy.h>
 19 #include <linux/of_device.h>
 20 #include <linux/of_irq.h>
 21 #include <linux/usb.h>
 22 #include <linux/usb/hcd.h>
 23 #include <linux/io.h>
 24 #include <linux/dma-mapping.h>
 25 
 26 #include "ehci.h"
 27 
 28 #define rdl(off)        __raw_readl(hcd->regs + (off))
 29 #define wrl(off, val)   __raw_writel((val), hcd->regs + (off))
 30 
 31 #define USB_CMD                 0x140
 32 #define USB_MODE                0x1a8
 33 #define USB_CAUSE               0x310
 34 #define USB_MASK                0x314
 35 #define USB_WINDOW_CTRL(i)      (0x320 + ((i) << 4))
 36 #define USB_WINDOW_BASE(i)      (0x324 + ((i) << 4))
 37 #define USB_IPG                 0x360
 38 #define USB_PHY_PWR_CTRL        0x400
 39 #define USB_PHY_TX_CTRL         0x420
 40 #define USB_PHY_RX_CTRL         0x430
 41 #define USB_PHY_IVREF_CTRL      0x440
 42 #define USB_PHY_TST_GRP_CTRL    0x450
 43 
 44 #define DRIVER_DESC "EHCI orion driver"
 45 
 46 #define hcd_to_orion_priv(h) ((struct orion_ehci_hcd *)hcd_to_ehci(h)->priv)
 47 
 48 struct orion_ehci_hcd {
 49         struct clk *clk;
 50         struct phy *phy;
 51 };
 52 
 53 static const char hcd_name[] = "ehci-orion";
 54 
 55 static struct hc_driver __read_mostly ehci_orion_hc_driver;
 56 
 57 /*
 58  * Implement Orion USB controller specification guidelines
 59  */
 60 static void orion_usb_phy_v1_setup(struct usb_hcd *hcd)
 61 {
 62         /* The below GLs are according to the Orion Errata document */
 63         /*
 64          * Clear interrupt cause and mask
 65          */
 66         wrl(USB_CAUSE, 0);
 67         wrl(USB_MASK, 0);
 68 
 69         /*
 70          * Reset controller
 71          */
 72         wrl(USB_CMD, rdl(USB_CMD) | 0x2);
 73         while (rdl(USB_CMD) & 0x2);
 74 
 75         /*
 76          * GL# USB-10: Set IPG for non start of frame packets
 77          * Bits[14:8]=0xc
 78          */
 79         wrl(USB_IPG, (rdl(USB_IPG) & ~0x7f00) | 0xc00);
 80 
 81         /*
 82          * GL# USB-9: USB 2.0 Power Control
 83          * BG_VSEL[7:6]=0x1
 84          */
 85         wrl(USB_PHY_PWR_CTRL, (rdl(USB_PHY_PWR_CTRL) & ~0xc0)| 0x40);
 86 
 87         /*
 88          * GL# USB-1: USB PHY Tx Control - force calibration to '8'
 89          * TXDATA_BLOCK_EN[21]=0x1, EXT_RCAL_EN[13]=0x1, IMP_CAL[6:3]=0x8
 90          */
 91         wrl(USB_PHY_TX_CTRL, (rdl(USB_PHY_TX_CTRL) & ~0x78) | 0x202040);
 92 
 93         /*
 94          * GL# USB-3 GL# USB-9: USB PHY Rx Control
 95          * RXDATA_BLOCK_LENGHT[31:30]=0x3, EDGE_DET_SEL[27:26]=0,
 96          * CDR_FASTLOCK_EN[21]=0, DISCON_THRESHOLD[9:8]=0, SQ_THRESH[7:4]=0x1
 97          */
 98         wrl(USB_PHY_RX_CTRL, (rdl(USB_PHY_RX_CTRL) & ~0xc2003f0) | 0xc0000010);
 99 
100         /*
101          * GL# USB-3 GL# USB-9: USB PHY IVREF Control
102          * PLLVDD12[1:0]=0x2, RXVDD[5:4]=0x3, Reserved[19]=0
103          */
104         wrl(USB_PHY_IVREF_CTRL, (rdl(USB_PHY_IVREF_CTRL) & ~0x80003 ) | 0x32);
105 
106         /*
107          * GL# USB-3 GL# USB-9: USB PHY Test Group Control
108          * REG_FIFO_SQ_RST[15]=0
109          */
110         wrl(USB_PHY_TST_GRP_CTRL, rdl(USB_PHY_TST_GRP_CTRL) & ~0x8000);
111 
112         /*
113          * Stop and reset controller
114          */
115         wrl(USB_CMD, rdl(USB_CMD) & ~0x1);
116         wrl(USB_CMD, rdl(USB_CMD) | 0x2);
117         while (rdl(USB_CMD) & 0x2);
118 
119         /*
120          * GL# USB-5 Streaming disable REG_USB_MODE[4]=1
121          * TBD: This need to be done after each reset!
122          * GL# USB-4 Setup USB Host mode
123          */
124         wrl(USB_MODE, 0x13);
125 }
126 
127 static void
128 ehci_orion_conf_mbus_windows(struct usb_hcd *hcd,
129                              const struct mbus_dram_target_info *dram)
130 {
131         int i;
132 
133         for (i = 0; i < 4; i++) {
134                 wrl(USB_WINDOW_CTRL(i), 0);
135                 wrl(USB_WINDOW_BASE(i), 0);
136         }
137 
138         for (i = 0; i < dram->num_cs; i++) {
139                 const struct mbus_dram_window *cs = dram->cs + i;
140 
141                 wrl(USB_WINDOW_CTRL(i), ((cs->size - 1) & 0xffff0000) |
142                                         (cs->mbus_attr << 8) |
143                                         (dram->mbus_dram_target_id << 4) | 1);
144                 wrl(USB_WINDOW_BASE(i), cs->base);
145         }
146 }
147 
148 static const struct ehci_driver_overrides orion_overrides __initconst = {
149         .extra_priv_size =      sizeof(struct orion_ehci_hcd),
150 };
151 
152 static int ehci_orion_drv_probe(struct platform_device *pdev)
153 {
154         struct orion_ehci_data *pd = dev_get_platdata(&pdev->dev);
155         const struct mbus_dram_target_info *dram;
156         struct resource *res;
157         struct usb_hcd *hcd;
158         struct ehci_hcd *ehci;
159         void __iomem *regs;
160         int irq, err;
161         enum orion_ehci_phy_ver phy_version;
162         struct orion_ehci_hcd *priv;
163 
164         if (usb_disabled())
165                 return -ENODEV;
166 
167         pr_debug("Initializing Orion-SoC USB Host Controller\n");
168 
169         irq = platform_get_irq(pdev, 0);
170         if (irq <= 0) {
171                 dev_err(&pdev->dev,
172                         "Found HC with no IRQ. Check %s setup!\n",
173                         dev_name(&pdev->dev));
174                 err = -ENODEV;
175                 goto err;
176         }
177 
178         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
179         if (!res) {
180                 dev_err(&pdev->dev,
181                         "Found HC with no register addr. Check %s setup!\n",
182                         dev_name(&pdev->dev));
183                 err = -ENODEV;
184                 goto err;
185         }
186 
187         /*
188          * Right now device-tree probed devices don't get dma_mask
189          * set. Since shared usb code relies on it, set it here for
190          * now. Once we have dma capability bindings this can go away.
191          */
192         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
193         if (err)
194                 goto err;
195 
196         regs = devm_ioremap_resource(&pdev->dev, res);
197         if (IS_ERR(regs)) {
198                 err = PTR_ERR(regs);
199                 goto err;
200         }
201 
202         hcd = usb_create_hcd(&ehci_orion_hc_driver,
203                         &pdev->dev, dev_name(&pdev->dev));
204         if (!hcd) {
205                 err = -ENOMEM;
206                 goto err;
207         }
208 
209         hcd->rsrc_start = res->start;
210         hcd->rsrc_len = resource_size(res);
211         hcd->regs = regs;
212 
213         ehci = hcd_to_ehci(hcd);
214         ehci->caps = hcd->regs + 0x100;
215         hcd->has_tt = 1;
216 
217         priv = hcd_to_orion_priv(hcd);
218         /*
219          * Not all platforms can gate the clock, so it is not an error if
220          * the clock does not exists.
221          */
222         priv->clk = devm_clk_get(&pdev->dev, NULL);
223         if (!IS_ERR(priv->clk))
224                 clk_prepare_enable(priv->clk);
225 
226         priv->phy = devm_phy_optional_get(&pdev->dev, "usb");
227         if (IS_ERR(priv->phy)) {
228                 err = PTR_ERR(priv->phy);
229                 goto err_phy_get;
230         } else {
231                 err = phy_init(priv->phy);
232                 if (err)
233                         goto err_phy_init;
234 
235                 err = phy_power_on(priv->phy);
236                 if (err)
237                         goto err_phy_power_on;
238         }
239 
240         /*
241          * (Re-)program MBUS remapping windows if we are asked to.
242          */
243         dram = mv_mbus_dram_info();
244         if (dram)
245                 ehci_orion_conf_mbus_windows(hcd, dram);
246 
247         /*
248          * setup Orion USB controller.
249          */
250         if (pdev->dev.of_node)
251                 phy_version = EHCI_PHY_NA;
252         else
253                 phy_version = pd->phy_version;
254 
255         switch (phy_version) {
256         case EHCI_PHY_NA:       /* dont change USB phy settings */
257                 break;
258         case EHCI_PHY_ORION:
259                 orion_usb_phy_v1_setup(hcd);
260                 break;
261         case EHCI_PHY_DD:
262         case EHCI_PHY_KW:
263         default:
264                 dev_warn(&pdev->dev, "USB phy version isn't supported.\n");
265         }
266 
267         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
268         if (err)
269                 goto err_add_hcd;
270 
271         device_wakeup_enable(hcd->self.controller);
272         return 0;
273 
274 err_add_hcd:
275         if (!IS_ERR(priv->phy))
276                 phy_power_off(priv->phy);
277 err_phy_power_on:
278         if (!IS_ERR(priv->phy))
279                 phy_exit(priv->phy);
280 err_phy_init:
281 err_phy_get:
282         if (!IS_ERR(priv->clk))
283                 clk_disable_unprepare(priv->clk);
284         usb_put_hcd(hcd);
285 err:
286         dev_err(&pdev->dev, "init %s fail, %d\n",
287                 dev_name(&pdev->dev), err);
288 
289         return err;
290 }
291 
292 static int ehci_orion_drv_remove(struct platform_device *pdev)
293 {
294         struct usb_hcd *hcd = platform_get_drvdata(pdev);
295         struct orion_ehci_hcd *priv = hcd_to_orion_priv(hcd);
296 
297         usb_remove_hcd(hcd);
298 
299         if (!IS_ERR(priv->phy)) {
300                 phy_power_off(priv->phy);
301                 phy_exit(priv->phy);
302         }
303 
304         if (!IS_ERR(priv->clk))
305                 clk_disable_unprepare(priv->clk);
306 
307         usb_put_hcd(hcd);
308 
309         return 0;
310 }
311 
312 static const struct of_device_id ehci_orion_dt_ids[] = {
313         { .compatible = "marvell,orion-ehci", },
314         {},
315 };
316 MODULE_DEVICE_TABLE(of, ehci_orion_dt_ids);
317 
318 static struct platform_driver ehci_orion_driver = {
319         .probe          = ehci_orion_drv_probe,
320         .remove         = ehci_orion_drv_remove,
321         .shutdown       = usb_hcd_platform_shutdown,
322         .driver = {
323                 .name   = "orion-ehci",
324                 .owner  = THIS_MODULE,
325                 .of_match_table = ehci_orion_dt_ids,
326         },
327 };
328 
329 static int __init ehci_orion_init(void)
330 {
331         if (usb_disabled())
332                 return -ENODEV;
333 
334         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
335 
336         ehci_init_driver(&ehci_orion_hc_driver, &orion_overrides);
337         return platform_driver_register(&ehci_orion_driver);
338 }
339 module_init(ehci_orion_init);
340 
341 static void __exit ehci_orion_cleanup(void)
342 {
343         platform_driver_unregister(&ehci_orion_driver);
344 }
345 module_exit(ehci_orion_cleanup);
346 
347 MODULE_DESCRIPTION(DRIVER_DESC);
348 MODULE_ALIAS("platform:orion-ehci");
349 MODULE_AUTHOR("Tzachi Perelstein");
350 MODULE_LICENSE("GPL v2");
351 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us