1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/arch/arm/mach-pxa/pxa3xx-ulpi.c
5 * code specific to pxa3xx aka Monahans
7 * Copyright (C) 2010 CompuLab Ltd.
9 * 2010-13-07: Igor Grinberg <grinberg@compulab.co.il>
10 * initial version: pxa310 USB Host mode support
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/slab.h>
16 #include <linux/device.h>
17 #include <linux/platform_device.h>
18 #include <linux/err.h>
20 #include <linux/delay.h>
21 #include <linux/clk.h>
22 #include <linux/usb.h>
23 #include <linux/usb/otg.h>
24 #include <linux/soc/pxa/cpu.h>
27 #include <linux/platform_data/usb-pxa3xx-ulpi.h>
29 struct pxa3xx_u2d_ulpi {
31 void __iomem *mmio_base;
34 unsigned int ulpi_mode;
37 static struct pxa3xx_u2d_ulpi *u2d;
39 static inline u32 u2d_readl(u32 reg)
41 return __raw_readl(u2d->mmio_base + reg);
44 static inline void u2d_writel(u32 reg, u32 val)
46 __raw_writel(val, u2d->mmio_base + reg);
49 #if defined(CONFIG_PXA310_ULPI)
50 enum u2d_ulpi_phy_mode {
58 static inline enum u2d_ulpi_phy_mode pxa310_ulpi_get_phymode(void)
60 return (u2d_readl(U2DOTGUSR) >> 28) & 0xF;
63 static int pxa310_ulpi_poll(void)
68 if (!(u2d_readl(U2DOTGUCR) & U2DOTGUCR_RUN))
74 pr_warn("%s: ULPI access timed out!\n", __func__);
79 static int pxa310_ulpi_read(struct usb_phy *otg, u32 reg)
83 if (pxa310_ulpi_get_phymode() != SYNCH) {
84 pr_warn("%s: PHY is not in SYNCH mode!\n", __func__);
88 u2d_writel(U2DOTGUCR, U2DOTGUCR_RUN | U2DOTGUCR_RNW | (reg << 16));
91 err = pxa310_ulpi_poll();
95 return u2d_readl(U2DOTGUCR) & U2DOTGUCR_RDATA;
98 static int pxa310_ulpi_write(struct usb_phy *otg, u32 val, u32 reg)
100 if (pxa310_ulpi_get_phymode() != SYNCH) {
101 pr_warn("%s: PHY is not in SYNCH mode!\n", __func__);
105 u2d_writel(U2DOTGUCR, U2DOTGUCR_RUN | (reg << 16) | (val << 8));
108 return pxa310_ulpi_poll();
111 struct usb_phy_io_ops pxa310_ulpi_access_ops = {
112 .read = pxa310_ulpi_read,
113 .write = pxa310_ulpi_write,
116 static void pxa310_otg_transceiver_rtsm(void)
120 /* put PHY to sync mode */
121 u2dotgcr = u2d_readl(U2DOTGCR);
122 u2dotgcr |= U2DOTGCR_RTSM | U2DOTGCR_UTMID;
123 u2d_writel(U2DOTGCR, u2dotgcr);
126 /* setup OTG sync mode */
127 u2dotgcr = u2d_readl(U2DOTGCR);
128 u2dotgcr |= U2DOTGCR_ULAF;
129 u2dotgcr &= ~(U2DOTGCR_SMAF | U2DOTGCR_CKAF);
130 u2d_writel(U2DOTGCR, u2dotgcr);
133 static int pxa310_start_otg_host_transcvr(struct usb_bus *host)
137 pxa310_otg_transceiver_rtsm();
139 err = usb_phy_init(u2d->otg);
141 pr_err("OTG transceiver init failed");
145 err = otg_set_vbus(u2d->otg->otg, 1);
147 pr_err("OTG transceiver VBUS set failed");
151 err = otg_set_host(u2d->otg->otg, host);
153 pr_err("OTG transceiver Host mode set failed");
158 static int pxa310_start_otg_hc(struct usb_bus *host)
163 /* disable USB device controller */
164 u2d_writel(U2DCR, u2d_readl(U2DCR) & ~U2DCR_UDE);
165 u2d_writel(U2DOTGCR, u2d_readl(U2DOTGCR) | U2DOTGCR_UTMID);
166 u2d_writel(U2DOTGICR, u2d_readl(U2DOTGICR) & ~0x37F7F);
168 err = pxa310_start_otg_host_transcvr(host);
172 /* set xceiver mode */
173 if (u2d->ulpi_mode & ULPI_IC_6PIN_SERIAL)
174 u2d_writel(U2DP3CR, u2d_readl(U2DP3CR) & ~U2DP3CR_P2SS);
175 else if (u2d->ulpi_mode & ULPI_IC_3PIN_SERIAL)
176 u2d_writel(U2DP3CR, u2d_readl(U2DP3CR) | U2DP3CR_P2SS);
178 /* start OTG host controller */
179 u2dotgcr = u2d_readl(U2DOTGCR) | U2DOTGCR_SMAF;
180 u2d_writel(U2DOTGCR, u2dotgcr & ~(U2DOTGCR_ULAF | U2DOTGCR_CKAF));
185 static void pxa310_stop_otg_hc(void)
187 pxa310_otg_transceiver_rtsm();
189 otg_set_host(u2d->otg->otg, NULL);
190 otg_set_vbus(u2d->otg->otg, 0);
191 usb_phy_shutdown(u2d->otg);
194 static void pxa310_u2d_setup_otg_hc(void)
198 u2dotgcr = u2d_readl(U2DOTGCR);
199 u2dotgcr |= U2DOTGCR_ULAF | U2DOTGCR_UTMID;
200 u2dotgcr &= ~(U2DOTGCR_SMAF | U2DOTGCR_CKAF);
201 u2d_writel(U2DOTGCR, u2dotgcr);
203 u2d_writel(U2DOTGCR, u2dotgcr | U2DOTGCR_ULE);
205 u2d_writel(U2DOTGICR, u2d_readl(U2DOTGICR) & ~0x37F7F);
208 static int pxa310_otg_init(struct pxa3xx_u2d_platform_data *pdata)
210 unsigned int ulpi_mode = ULPI_OTG_DRVVBUS;
213 if (pdata->ulpi_mode & ULPI_SER_6PIN)
214 ulpi_mode |= ULPI_IC_6PIN_SERIAL;
215 else if (pdata->ulpi_mode & ULPI_SER_3PIN)
216 ulpi_mode |= ULPI_IC_3PIN_SERIAL;
219 u2d->ulpi_mode = ulpi_mode;
221 u2d->otg = otg_ulpi_create(&pxa310_ulpi_access_ops, ulpi_mode);
225 u2d->otg->io_priv = u2d->mmio_base;
230 static void pxa310_otg_exit(void)
235 static inline void pxa310_u2d_setup_otg_hc(void) {}
236 static inline int pxa310_start_otg_hc(struct usb_bus *host)
240 static inline void pxa310_stop_otg_hc(void) {}
241 static inline int pxa310_otg_init(struct pxa3xx_u2d_platform_data *pdata)
245 static inline void pxa310_otg_exit(void) {}
246 #endif /* CONFIG_PXA310_ULPI */
248 int pxa3xx_u2d_start_hc(struct usb_bus *host)
252 /* In case the PXA3xx ULPI isn't used, do nothing. */
256 clk_prepare_enable(u2d->clk);
258 if (cpu_is_pxa310()) {
259 pxa310_u2d_setup_otg_hc();
260 err = pxa310_start_otg_hc(host);
265 EXPORT_SYMBOL_GPL(pxa3xx_u2d_start_hc);
267 void pxa3xx_u2d_stop_hc(struct usb_bus *host)
269 /* In case the PXA3xx ULPI isn't used, do nothing. */
274 pxa310_stop_otg_hc();
276 clk_disable_unprepare(u2d->clk);
278 EXPORT_SYMBOL_GPL(pxa3xx_u2d_stop_hc);
280 static int pxa3xx_u2d_probe(struct platform_device *pdev)
282 struct pxa3xx_u2d_platform_data *pdata = pdev->dev.platform_data;
286 u2d = kzalloc(sizeof(*u2d), GFP_KERNEL);
290 u2d->clk = clk_get(&pdev->dev, NULL);
291 if (IS_ERR(u2d->clk)) {
292 dev_err(&pdev->dev, "failed to get u2d clock\n");
293 err = PTR_ERR(u2d->clk);
297 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
299 dev_err(&pdev->dev, "no IO memory resource defined\n");
304 r = request_mem_region(r->start, resource_size(r), pdev->name);
306 dev_err(&pdev->dev, "failed to request memory resource\n");
311 u2d->mmio_base = ioremap(r->start, resource_size(r));
312 if (!u2d->mmio_base) {
313 dev_err(&pdev->dev, "ioremap() failed\n");
319 err = pdata->init(&pdev->dev);
324 /* Only PXA310 U2D has OTG functionality */
325 if (cpu_is_pxa310()) {
326 err = pxa310_otg_init(pdata);
331 platform_set_drvdata(pdev, u2d);
337 pdata->exit(&pdev->dev);
339 iounmap(u2d->mmio_base);
341 release_mem_region(r->start, resource_size(r));
349 static int pxa3xx_u2d_remove(struct platform_device *pdev)
351 struct pxa3xx_u2d_platform_data *pdata = pdev->dev.platform_data;
354 if (cpu_is_pxa310()) {
355 pxa310_stop_otg_hc();
360 pdata->exit(&pdev->dev);
362 platform_set_drvdata(pdev, NULL);
363 iounmap(u2d->mmio_base);
364 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
365 release_mem_region(r->start, resource_size(r));
374 static struct platform_driver pxa3xx_u2d_ulpi_driver = {
376 .name = "pxa3xx-u2d",
378 .probe = pxa3xx_u2d_probe,
379 .remove = pxa3xx_u2d_remove,
381 module_platform_driver(pxa3xx_u2d_ulpi_driver);
383 MODULE_DESCRIPTION("PXA3xx U2D ULPI driver");
384 MODULE_AUTHOR("Igor Grinberg");
385 MODULE_LICENSE("GPL v2");