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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * drivers/usb/host/ehci-orion.c
4  *
5  * Tzachi Perelstein <[email protected]>
6  */
7
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/mbus.h>
12 #include <linux/clk.h>
13 #include <linux/platform_data/usb-ehci-orion.h>
14 #include <linux/of.h>
15 #include <linux/phy/phy.h>
16 #include <linux/usb.h>
17 #include <linux/usb/hcd.h>
18 #include <linux/io.h>
19 #include <linux/dma-mapping.h>
20
21 #include "ehci.h"
22
23 #define rdl(off)        readl_relaxed(hcd->regs + (off))
24 #define wrl(off, val)   writel_relaxed((val), hcd->regs + (off))
25
26 #define USB_CMD                 0x140
27 #define   USB_CMD_RUN           BIT(0)
28 #define   USB_CMD_RESET         BIT(1)
29 #define USB_MODE                0x1a8
30 #define   USB_MODE_MASK         GENMASK(1, 0)
31 #define   USB_MODE_DEVICE       0x2
32 #define   USB_MODE_HOST         0x3
33 #define   USB_MODE_SDIS         BIT(4)
34 #define USB_CAUSE               0x310
35 #define USB_MASK                0x314
36 #define USB_WINDOW_CTRL(i)      (0x320 + ((i) << 4))
37 #define USB_WINDOW_BASE(i)      (0x324 + ((i) << 4))
38 #define USB_IPG                 0x360
39 #define USB_PHY_PWR_CTRL        0x400
40 #define USB_PHY_TX_CTRL         0x420
41 #define USB_PHY_RX_CTRL         0x430
42 #define USB_PHY_IVREF_CTRL      0x440
43 #define USB_PHY_TST_GRP_CTRL    0x450
44
45 #define USB_SBUSCFG             0x90
46
47 /* BAWR = BARD = 3 : Align read/write bursts packets larger than 128 bytes */
48 #define USB_SBUSCFG_BAWR_ALIGN_128B     (0x3 << 6)
49 #define USB_SBUSCFG_BARD_ALIGN_128B     (0x3 << 3)
50 /* AHBBRST = 3     : Align AHB Burst to INCR16 (64 bytes) */
51 #define USB_SBUSCFG_AHBBRST_INCR16      (0x3 << 0)
52
53 #define USB_SBUSCFG_DEF_VAL (USB_SBUSCFG_BAWR_ALIGN_128B        \
54                              | USB_SBUSCFG_BARD_ALIGN_128B      \
55                              | USB_SBUSCFG_AHBBRST_INCR16)
56
57 #define DRIVER_DESC "EHCI orion driver"
58
59 #define hcd_to_orion_priv(h) ((struct orion_ehci_hcd *)hcd_to_ehci(h)->priv)
60
61 struct orion_ehci_hcd {
62         struct clk *clk;
63         struct phy *phy;
64 };
65
66 static struct hc_driver __read_mostly ehci_orion_hc_driver;
67
68 /*
69  * Legacy DMA mask is 32 bit.
70  * AC5 has the DDR starting at 8GB, hence it requires
71  * a larger (34-bit) DMA mask, in order for DMA allocations
72  * to succeed:
73  */
74 static const u64 dma_mask_orion =       DMA_BIT_MASK(32);
75 static const u64 dma_mask_ac5 =         DMA_BIT_MASK(34);
76
77 /*
78  * Implement Orion USB controller specification guidelines
79  */
80 static void orion_usb_phy_v1_setup(struct usb_hcd *hcd)
81 {
82         /* The below GLs are according to the Orion Errata document */
83         /*
84          * Clear interrupt cause and mask
85          */
86         wrl(USB_CAUSE, 0);
87         wrl(USB_MASK, 0);
88
89         /*
90          * Reset controller
91          */
92         wrl(USB_CMD, rdl(USB_CMD) | USB_CMD_RESET);
93         while (rdl(USB_CMD) & USB_CMD_RESET);
94
95         /*
96          * GL# USB-10: Set IPG for non start of frame packets
97          * Bits[14:8]=0xc
98          */
99         wrl(USB_IPG, (rdl(USB_IPG) & ~0x7f00) | 0xc00);
100
101         /*
102          * GL# USB-9: USB 2.0 Power Control
103          * BG_VSEL[7:6]=0x1
104          */
105         wrl(USB_PHY_PWR_CTRL, (rdl(USB_PHY_PWR_CTRL) & ~0xc0)| 0x40);
106
107         /*
108          * GL# USB-1: USB PHY Tx Control - force calibration to '8'
109          * TXDATA_BLOCK_EN[21]=0x1, EXT_RCAL_EN[13]=0x1, IMP_CAL[6:3]=0x8
110          */
111         wrl(USB_PHY_TX_CTRL, (rdl(USB_PHY_TX_CTRL) & ~0x78) | 0x202040);
112
113         /*
114          * GL# USB-3 GL# USB-9: USB PHY Rx Control
115          * RXDATA_BLOCK_LENGHT[31:30]=0x3, EDGE_DET_SEL[27:26]=0,
116          * CDR_FASTLOCK_EN[21]=0, DISCON_THRESHOLD[9:8]=0, SQ_THRESH[7:4]=0x1
117          */
118         wrl(USB_PHY_RX_CTRL, (rdl(USB_PHY_RX_CTRL) & ~0xc2003f0) | 0xc0000010);
119
120         /*
121          * GL# USB-3 GL# USB-9: USB PHY IVREF Control
122          * PLLVDD12[1:0]=0x2, RXVDD[5:4]=0x3, Reserved[19]=0
123          */
124         wrl(USB_PHY_IVREF_CTRL, (rdl(USB_PHY_IVREF_CTRL) & ~0x80003 ) | 0x32);
125
126         /*
127          * GL# USB-3 GL# USB-9: USB PHY Test Group Control
128          * REG_FIFO_SQ_RST[15]=0
129          */
130         wrl(USB_PHY_TST_GRP_CTRL, rdl(USB_PHY_TST_GRP_CTRL) & ~0x8000);
131
132         /*
133          * Stop and reset controller
134          */
135         wrl(USB_CMD, rdl(USB_CMD) & ~USB_CMD_RUN);
136         wrl(USB_CMD, rdl(USB_CMD) | USB_CMD_RESET);
137         while (rdl(USB_CMD) & USB_CMD_RESET);
138
139         /*
140          * GL# USB-5 Streaming disable REG_USB_MODE[4]=1
141          * TBD: This need to be done after each reset!
142          * GL# USB-4 Setup USB Host mode
143          */
144         wrl(USB_MODE, USB_MODE_SDIS | USB_MODE_HOST);
145 }
146
147 static void
148 ehci_orion_conf_mbus_windows(struct usb_hcd *hcd,
149                              const struct mbus_dram_target_info *dram)
150 {
151         int i;
152
153         for (i = 0; i < 4; i++) {
154                 wrl(USB_WINDOW_CTRL(i), 0);
155                 wrl(USB_WINDOW_BASE(i), 0);
156         }
157
158         for (i = 0; i < dram->num_cs; i++) {
159                 const struct mbus_dram_window *cs = dram->cs + i;
160
161                 wrl(USB_WINDOW_CTRL(i), ((cs->size - 1) & 0xffff0000) |
162                                         (cs->mbus_attr << 8) |
163                                         (dram->mbus_dram_target_id << 4) | 1);
164                 wrl(USB_WINDOW_BASE(i), cs->base);
165         }
166 }
167
168 static int ehci_orion_drv_reset(struct usb_hcd *hcd)
169 {
170         struct device *dev = hcd->self.controller;
171         int ret;
172
173         ret = ehci_setup(hcd);
174         if (ret)
175                 return ret;
176
177         /*
178          * For SoC without hlock, need to program sbuscfg value to guarantee
179          * AHB master's burst would not overrun or underrun FIFO.
180          *
181          * sbuscfg reg has to be set after usb controller reset, otherwise
182          * the value would be override to 0.
183          */
184         if (of_device_is_compatible(dev->of_node, "marvell,armada-3700-ehci"))
185                 wrl(USB_SBUSCFG, USB_SBUSCFG_DEF_VAL);
186
187         return ret;
188 }
189
190 static int __maybe_unused ehci_orion_drv_suspend(struct device *dev)
191 {
192         struct usb_hcd *hcd = dev_get_drvdata(dev);
193
194         return ehci_suspend(hcd, device_may_wakeup(dev));
195 }
196
197 static int __maybe_unused ehci_orion_drv_resume(struct device *dev)
198 {
199         struct usb_hcd *hcd = dev_get_drvdata(dev);
200
201         return ehci_resume(hcd, false);
202 }
203
204 static SIMPLE_DEV_PM_OPS(ehci_orion_pm_ops, ehci_orion_drv_suspend,
205                          ehci_orion_drv_resume);
206
207 static const struct ehci_driver_overrides orion_overrides __initconst = {
208         .extra_priv_size =      sizeof(struct orion_ehci_hcd),
209         .reset = ehci_orion_drv_reset,
210 };
211
212 static int ehci_orion_drv_probe(struct platform_device *pdev)
213 {
214         struct orion_ehci_data *pd = dev_get_platdata(&pdev->dev);
215         const struct mbus_dram_target_info *dram;
216         struct resource *res;
217         struct usb_hcd *hcd;
218         struct ehci_hcd *ehci;
219         void __iomem *regs;
220         int irq, err;
221         enum orion_ehci_phy_ver phy_version;
222         struct orion_ehci_hcd *priv;
223         u64 *dma_mask_ptr;
224
225         if (usb_disabled())
226                 return -ENODEV;
227
228         pr_debug("Initializing Orion-SoC USB Host Controller\n");
229
230         irq = platform_get_irq(pdev, 0);
231         if (irq < 0) {
232                 err = irq;
233                 goto err;
234         }
235
236         /*
237          * Right now device-tree probed devices don't get dma_mask
238          * set. Since shared usb code relies on it, set it here for
239          * now. Once we have dma capability bindings this can go away.
240          */
241         dma_mask_ptr = (u64 *)of_device_get_match_data(&pdev->dev);
242         err = dma_coerce_mask_and_coherent(&pdev->dev, *dma_mask_ptr);
243         if (err)
244                 goto err;
245
246         regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
247         if (IS_ERR(regs)) {
248                 err = PTR_ERR(regs);
249                 goto err;
250         }
251
252         hcd = usb_create_hcd(&ehci_orion_hc_driver,
253                         &pdev->dev, dev_name(&pdev->dev));
254         if (!hcd) {
255                 err = -ENOMEM;
256                 goto err;
257         }
258
259         hcd->rsrc_start = res->start;
260         hcd->rsrc_len = resource_size(res);
261         hcd->regs = regs;
262
263         ehci = hcd_to_ehci(hcd);
264         ehci->caps = hcd->regs + 0x100;
265         hcd->has_tt = 1;
266
267         priv = hcd_to_orion_priv(hcd);
268         /*
269          * Not all platforms can gate the clock, so it is not an error if
270          * the clock does not exists.
271          */
272         priv->clk = devm_clk_get(&pdev->dev, NULL);
273         if (!IS_ERR(priv->clk)) {
274                 err = clk_prepare_enable(priv->clk);
275                 if (err)
276                         goto err_put_hcd;
277         }
278
279         priv->phy = devm_phy_optional_get(&pdev->dev, "usb");
280         if (IS_ERR(priv->phy)) {
281                 err = PTR_ERR(priv->phy);
282                 if (err != -ENOSYS)
283                         goto err_dis_clk;
284         }
285
286         /*
287          * (Re-)program MBUS remapping windows if we are asked to.
288          */
289         dram = mv_mbus_dram_info();
290         if (dram)
291                 ehci_orion_conf_mbus_windows(hcd, dram);
292
293         /*
294          * setup Orion USB controller.
295          */
296         if (pdev->dev.of_node)
297                 phy_version = EHCI_PHY_NA;
298         else
299                 phy_version = pd->phy_version;
300
301         switch (phy_version) {
302         case EHCI_PHY_NA:       /* dont change USB phy settings */
303                 break;
304         case EHCI_PHY_ORION:
305                 orion_usb_phy_v1_setup(hcd);
306                 break;
307         case EHCI_PHY_DD:
308         case EHCI_PHY_KW:
309         default:
310                 dev_warn(&pdev->dev, "USB phy version isn't supported.\n");
311         }
312
313         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
314         if (err)
315                 goto err_dis_clk;
316
317         device_wakeup_enable(hcd->self.controller);
318         return 0;
319
320 err_dis_clk:
321         if (!IS_ERR(priv->clk))
322                 clk_disable_unprepare(priv->clk);
323 err_put_hcd:
324         usb_put_hcd(hcd);
325 err:
326         dev_err(&pdev->dev, "init %s fail, %d\n",
327                 dev_name(&pdev->dev), err);
328
329         return err;
330 }
331
332 static void ehci_orion_drv_remove(struct platform_device *pdev)
333 {
334         struct usb_hcd *hcd = platform_get_drvdata(pdev);
335         struct orion_ehci_hcd *priv = hcd_to_orion_priv(hcd);
336
337         usb_remove_hcd(hcd);
338
339         if (!IS_ERR(priv->clk))
340                 clk_disable_unprepare(priv->clk);
341
342         usb_put_hcd(hcd);
343 }
344
345 static const struct of_device_id ehci_orion_dt_ids[] = {
346         { .compatible = "marvell,orion-ehci", .data = &dma_mask_orion},
347         { .compatible = "marvell,armada-3700-ehci", .data = &dma_mask_orion},
348         { .compatible = "marvell,ac5-ehci", .data = &dma_mask_ac5},
349         {},
350 };
351 MODULE_DEVICE_TABLE(of, ehci_orion_dt_ids);
352
353 static struct platform_driver ehci_orion_driver = {
354         .probe          = ehci_orion_drv_probe,
355         .remove_new     = ehci_orion_drv_remove,
356         .shutdown       = usb_hcd_platform_shutdown,
357         .driver = {
358                 .name   = "orion-ehci",
359                 .of_match_table = ehci_orion_dt_ids,
360                 .pm = &ehci_orion_pm_ops,
361         },
362 };
363
364 static int __init ehci_orion_init(void)
365 {
366         if (usb_disabled())
367                 return -ENODEV;
368
369         ehci_init_driver(&ehci_orion_hc_driver, &orion_overrides);
370         return platform_driver_register(&ehci_orion_driver);
371 }
372 module_init(ehci_orion_init);
373
374 static void __exit ehci_orion_cleanup(void)
375 {
376         platform_driver_unregister(&ehci_orion_driver);
377 }
378 module_exit(ehci_orion_cleanup);
379
380 MODULE_DESCRIPTION(DRIVER_DESC);
381 MODULE_ALIAS("platform:orion-ehci");
382 MODULE_AUTHOR("Tzachi Perelstein");
383 MODULE_LICENSE("GPL v2");
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