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

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