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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/of_device.h>
 19 #include <linux/of_irq.h>
 20 #include <linux/usb.h>
 21 #include <linux/usb/hcd.h>
 22 #include <linux/io.h>
 23 #include <linux/dma-mapping.h>
 24 
 25 #include "ehci.h"
 26 
 27 #define rdl(off)        __raw_readl(hcd->regs + (off))
 28 #define wrl(off, val)   __raw_writel((val), hcd->regs + (off))
 29 
 30 #define USB_CMD                 0x140
 31 #define USB_MODE                0x1a8
 32 #define USB_CAUSE               0x310
 33 #define USB_MASK                0x314
 34 #define USB_WINDOW_CTRL(i)      (0x320 + ((i) << 4))
 35 #define USB_WINDOW_BASE(i)      (0x324 + ((i) << 4))
 36 #define USB_IPG                 0x360
 37 #define USB_PHY_PWR_CTRL        0x400
 38 #define USB_PHY_TX_CTRL         0x420
 39 #define USB_PHY_RX_CTRL         0x430
 40 #define USB_PHY_IVREF_CTRL      0x440
 41 #define USB_PHY_TST_GRP_CTRL    0x450
 42 
 43 #define DRIVER_DESC "EHCI orion driver"
 44 
 45 static const char hcd_name[] = "ehci-orion";
 46 
 47 static struct hc_driver __read_mostly ehci_orion_hc_driver;
 48 
 49 /*
 50  * Implement Orion USB controller specification guidelines
 51  */
 52 static void orion_usb_phy_v1_setup(struct usb_hcd *hcd)
 53 {
 54         /* The below GLs are according to the Orion Errata document */
 55         /*
 56          * Clear interrupt cause and mask
 57          */
 58         wrl(USB_CAUSE, 0);
 59         wrl(USB_MASK, 0);
 60 
 61         /*
 62          * Reset controller
 63          */
 64         wrl(USB_CMD, rdl(USB_CMD) | 0x2);
 65         while (rdl(USB_CMD) & 0x2);
 66 
 67         /*
 68          * GL# USB-10: Set IPG for non start of frame packets
 69          * Bits[14:8]=0xc
 70          */
 71         wrl(USB_IPG, (rdl(USB_IPG) & ~0x7f00) | 0xc00);
 72 
 73         /*
 74          * GL# USB-9: USB 2.0 Power Control
 75          * BG_VSEL[7:6]=0x1
 76          */
 77         wrl(USB_PHY_PWR_CTRL, (rdl(USB_PHY_PWR_CTRL) & ~0xc0)| 0x40);
 78 
 79         /*
 80          * GL# USB-1: USB PHY Tx Control - force calibration to '8'
 81          * TXDATA_BLOCK_EN[21]=0x1, EXT_RCAL_EN[13]=0x1, IMP_CAL[6:3]=0x8
 82          */
 83         wrl(USB_PHY_TX_CTRL, (rdl(USB_PHY_TX_CTRL) & ~0x78) | 0x202040);
 84 
 85         /*
 86          * GL# USB-3 GL# USB-9: USB PHY Rx Control
 87          * RXDATA_BLOCK_LENGHT[31:30]=0x3, EDGE_DET_SEL[27:26]=0,
 88          * CDR_FASTLOCK_EN[21]=0, DISCON_THRESHOLD[9:8]=0, SQ_THRESH[7:4]=0x1
 89          */
 90         wrl(USB_PHY_RX_CTRL, (rdl(USB_PHY_RX_CTRL) & ~0xc2003f0) | 0xc0000010);
 91 
 92         /*
 93          * GL# USB-3 GL# USB-9: USB PHY IVREF Control
 94          * PLLVDD12[1:0]=0x2, RXVDD[5:4]=0x3, Reserved[19]=0
 95          */
 96         wrl(USB_PHY_IVREF_CTRL, (rdl(USB_PHY_IVREF_CTRL) & ~0x80003 ) | 0x32);
 97 
 98         /*
 99          * GL# USB-3 GL# USB-9: USB PHY Test Group Control
100          * REG_FIFO_SQ_RST[15]=0
101          */
102         wrl(USB_PHY_TST_GRP_CTRL, rdl(USB_PHY_TST_GRP_CTRL) & ~0x8000);
103 
104         /*
105          * Stop and reset controller
106          */
107         wrl(USB_CMD, rdl(USB_CMD) & ~0x1);
108         wrl(USB_CMD, rdl(USB_CMD) | 0x2);
109         while (rdl(USB_CMD) & 0x2);
110 
111         /*
112          * GL# USB-5 Streaming disable REG_USB_MODE[4]=1
113          * TBD: This need to be done after each reset!
114          * GL# USB-4 Setup USB Host mode
115          */
116         wrl(USB_MODE, 0x13);
117 }
118 
119 static void
120 ehci_orion_conf_mbus_windows(struct usb_hcd *hcd,
121                              const struct mbus_dram_target_info *dram)
122 {
123         int i;
124 
125         for (i = 0; i < 4; i++) {
126                 wrl(USB_WINDOW_CTRL(i), 0);
127                 wrl(USB_WINDOW_BASE(i), 0);
128         }
129 
130         for (i = 0; i < dram->num_cs; i++) {
131                 const struct mbus_dram_window *cs = dram->cs + i;
132 
133                 wrl(USB_WINDOW_CTRL(i), ((cs->size - 1) & 0xffff0000) |
134                                         (cs->mbus_attr << 8) |
135                                         (dram->mbus_dram_target_id << 4) | 1);
136                 wrl(USB_WINDOW_BASE(i), cs->base);
137         }
138 }
139 
140 static int ehci_orion_drv_probe(struct platform_device *pdev)
141 {
142         struct orion_ehci_data *pd = dev_get_platdata(&pdev->dev);
143         const struct mbus_dram_target_info *dram;
144         struct resource *res;
145         struct usb_hcd *hcd;
146         struct ehci_hcd *ehci;
147         struct clk *clk;
148         void __iomem *regs;
149         int irq, err;
150         enum orion_ehci_phy_ver phy_version;
151 
152         if (usb_disabled())
153                 return -ENODEV;
154 
155         pr_debug("Initializing Orion-SoC USB Host Controller\n");
156 
157         if (pdev->dev.of_node)
158                 irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
159         else
160                 irq = platform_get_irq(pdev, 0);
161         if (irq <= 0) {
162                 dev_err(&pdev->dev,
163                         "Found HC with no IRQ. Check %s setup!\n",
164                         dev_name(&pdev->dev));
165                 err = -ENODEV;
166                 goto err1;
167         }
168 
169         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
170         if (!res) {
171                 dev_err(&pdev->dev,
172                         "Found HC with no register addr. Check %s setup!\n",
173                         dev_name(&pdev->dev));
174                 err = -ENODEV;
175                 goto err1;
176         }
177 
178         /*
179          * Right now device-tree probed devices don't get dma_mask
180          * set. Since shared usb code relies on it, set it here for
181          * now. Once we have dma capability bindings this can go away.
182          */
183         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
184         if (err)
185                 goto err1;
186 
187         regs = devm_ioremap_resource(&pdev->dev, res);
188         if (IS_ERR(regs)) {
189                 err = PTR_ERR(regs);
190                 goto err1;
191         }
192 
193         /* Not all platforms can gate the clock, so it is not
194            an error if the clock does not exists. */
195         clk = devm_clk_get(&pdev->dev, NULL);
196         if (!IS_ERR(clk))
197                 clk_prepare_enable(clk);
198 
199         hcd = usb_create_hcd(&ehci_orion_hc_driver,
200                         &pdev->dev, dev_name(&pdev->dev));
201         if (!hcd) {
202                 err = -ENOMEM;
203                 goto err2;
204         }
205 
206         hcd->rsrc_start = res->start;
207         hcd->rsrc_len = resource_size(res);
208         hcd->regs = regs;
209 
210         ehci = hcd_to_ehci(hcd);
211         ehci->caps = hcd->regs + 0x100;
212         hcd->has_tt = 1;
213 
214         /*
215          * (Re-)program MBUS remapping windows if we are asked to.
216          */
217         dram = mv_mbus_dram_info();
218         if (dram)
219                 ehci_orion_conf_mbus_windows(hcd, dram);
220 
221         /*
222          * setup Orion USB controller.
223          */
224         if (pdev->dev.of_node)
225                 phy_version = EHCI_PHY_NA;
226         else
227                 phy_version = pd->phy_version;
228 
229         switch (phy_version) {
230         case EHCI_PHY_NA:       /* dont change USB phy settings */
231                 break;
232         case EHCI_PHY_ORION:
233                 orion_usb_phy_v1_setup(hcd);
234                 break;
235         case EHCI_PHY_DD:
236         case EHCI_PHY_KW:
237         default:
238                 dev_warn(&pdev->dev, "USB phy version isn't supported.\n");
239         }
240 
241         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
242         if (err)
243                 goto err3;
244 
245         device_wakeup_enable(hcd->self.controller);
246         return 0;
247 
248 err3:
249         usb_put_hcd(hcd);
250 err2:
251         if (!IS_ERR(clk))
252                 clk_disable_unprepare(clk);
253 err1:
254         dev_err(&pdev->dev, "init %s fail, %d\n",
255                 dev_name(&pdev->dev), err);
256 
257         return err;
258 }
259 
260 static int ehci_orion_drv_remove(struct platform_device *pdev)
261 {
262         struct usb_hcd *hcd = platform_get_drvdata(pdev);
263         struct clk *clk;
264 
265         usb_remove_hcd(hcd);
266         usb_put_hcd(hcd);
267 
268         clk = devm_clk_get(&pdev->dev, NULL);
269         if (!IS_ERR(clk))
270                 clk_disable_unprepare(clk);
271         return 0;
272 }
273 
274 static const struct of_device_id ehci_orion_dt_ids[] = {
275         { .compatible = "marvell,orion-ehci", },
276         {},
277 };
278 MODULE_DEVICE_TABLE(of, ehci_orion_dt_ids);
279 
280 static struct platform_driver ehci_orion_driver = {
281         .probe          = ehci_orion_drv_probe,
282         .remove         = ehci_orion_drv_remove,
283         .shutdown       = usb_hcd_platform_shutdown,
284         .driver = {
285                 .name   = "orion-ehci",
286                 .owner  = THIS_MODULE,
287                 .of_match_table = ehci_orion_dt_ids,
288         },
289 };
290 
291 static int __init ehci_orion_init(void)
292 {
293         if (usb_disabled())
294                 return -ENODEV;
295 
296         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
297 
298         ehci_init_driver(&ehci_orion_hc_driver, NULL);
299         return platform_driver_register(&ehci_orion_driver);
300 }
301 module_init(ehci_orion_init);
302 
303 static void __exit ehci_orion_cleanup(void)
304 {
305         platform_driver_unregister(&ehci_orion_driver);
306 }
307 module_exit(ehci_orion_cleanup);
308 
309 MODULE_DESCRIPTION(DRIVER_DESC);
310 MODULE_ALIAS("platform:orion-ehci");
311 MODULE_AUTHOR("Tzachi Perelstein");
312 MODULE_LICENSE("GPL v2");
313 

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