2 * linux/arch/arm/mach-pxa/pxa3xx-ulpi.c
4 * code specific to pxa3xx aka Monahans
6 * Copyright (C) 2010 CompuLab Ltd.
8 * 2010-13-07: Igor Grinberg <grinberg@compulab.co.il>
9 * initial version: pxa310 USB Host mode support
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/slab.h>
19 #include <linux/device.h>
20 #include <linux/platform_device.h>
21 #include <linux/err.h>
23 #include <linux/delay.h>
24 #include <linux/clk.h>
25 #include <linux/usb.h>
26 #include <linux/usb/otg.h>
28 #include <mach/hardware.h>
29 #include <mach/regs-u2d.h>
30 #include <linux/platform_data/usb-pxa3xx-ulpi.h>
32 struct pxa3xx_u2d_ulpi {
34 void __iomem *mmio_base;
37 unsigned int ulpi_mode;
40 static struct pxa3xx_u2d_ulpi *u2d;
42 static inline u32 u2d_readl(u32 reg)
44 return __raw_readl(u2d->mmio_base + reg);
47 static inline void u2d_writel(u32 reg, u32 val)
49 __raw_writel(val, u2d->mmio_base + reg);
52 #if defined(CONFIG_PXA310_ULPI)
53 enum u2d_ulpi_phy_mode {
61 static inline enum u2d_ulpi_phy_mode pxa310_ulpi_get_phymode(void)
63 return (u2d_readl(U2DOTGUSR) >> 28) & 0xF;
66 static int pxa310_ulpi_poll(void)
71 if (!(u2d_readl(U2DOTGUCR) & U2DOTGUCR_RUN))
77 pr_warning("%s: ULPI access timed out!\n", __func__);
82 static int pxa310_ulpi_read(struct usb_phy *otg, u32 reg)
86 if (pxa310_ulpi_get_phymode() != SYNCH) {
87 pr_warning("%s: PHY is not in SYNCH mode!\n", __func__);
91 u2d_writel(U2DOTGUCR, U2DOTGUCR_RUN | U2DOTGUCR_RNW | (reg << 16));
94 err = pxa310_ulpi_poll();
98 return u2d_readl(U2DOTGUCR) & U2DOTGUCR_RDATA;
101 static int pxa310_ulpi_write(struct usb_phy *otg, u32 val, u32 reg)
103 if (pxa310_ulpi_get_phymode() != SYNCH) {
104 pr_warning("%s: PHY is not in SYNCH mode!\n", __func__);
108 u2d_writel(U2DOTGUCR, U2DOTGUCR_RUN | (reg << 16) | (val << 8));
111 return pxa310_ulpi_poll();
114 struct usb_phy_io_ops pxa310_ulpi_access_ops = {
115 .read = pxa310_ulpi_read,
116 .write = pxa310_ulpi_write,
119 static void pxa310_otg_transceiver_rtsm(void)
123 /* put PHY to sync mode */
124 u2dotgcr = u2d_readl(U2DOTGCR);
125 u2dotgcr |= U2DOTGCR_RTSM | U2DOTGCR_UTMID;
126 u2d_writel(U2DOTGCR, u2dotgcr);
129 /* setup OTG sync mode */
130 u2dotgcr = u2d_readl(U2DOTGCR);
131 u2dotgcr |= U2DOTGCR_ULAF;
132 u2dotgcr &= ~(U2DOTGCR_SMAF | U2DOTGCR_CKAF);
133 u2d_writel(U2DOTGCR, u2dotgcr);
136 static int pxa310_start_otg_host_transcvr(struct usb_bus *host)
140 pxa310_otg_transceiver_rtsm();
142 err = usb_phy_init(u2d->otg);
144 pr_err("OTG transceiver init failed");
148 err = otg_set_vbus(u2d->otg->otg, 1);
150 pr_err("OTG transceiver VBUS set failed");
154 err = otg_set_host(u2d->otg->otg, host);
156 pr_err("OTG transceiver Host mode set failed");
161 static int pxa310_start_otg_hc(struct usb_bus *host)
166 /* disable USB device controller */
167 u2d_writel(U2DCR, u2d_readl(U2DCR) & ~U2DCR_UDE);
168 u2d_writel(U2DOTGCR, u2d_readl(U2DOTGCR) | U2DOTGCR_UTMID);
169 u2d_writel(U2DOTGICR, u2d_readl(U2DOTGICR) & ~0x37F7F);
171 err = pxa310_start_otg_host_transcvr(host);
175 /* set xceiver mode */
176 if (u2d->ulpi_mode & ULPI_IC_6PIN_SERIAL)
177 u2d_writel(U2DP3CR, u2d_readl(U2DP3CR) & ~U2DP3CR_P2SS);
178 else if (u2d->ulpi_mode & ULPI_IC_3PIN_SERIAL)
179 u2d_writel(U2DP3CR, u2d_readl(U2DP3CR) | U2DP3CR_P2SS);
181 /* start OTG host controller */
182 u2dotgcr = u2d_readl(U2DOTGCR) | U2DOTGCR_SMAF;
183 u2d_writel(U2DOTGCR, u2dotgcr & ~(U2DOTGCR_ULAF | U2DOTGCR_CKAF));
188 static void pxa310_stop_otg_hc(void)
190 pxa310_otg_transceiver_rtsm();
192 otg_set_host(u2d->otg->otg, NULL);
193 otg_set_vbus(u2d->otg->otg, 0);
194 usb_phy_shutdown(u2d->otg);
197 static void pxa310_u2d_setup_otg_hc(void)
201 u2dotgcr = u2d_readl(U2DOTGCR);
202 u2dotgcr |= U2DOTGCR_ULAF | U2DOTGCR_UTMID;
203 u2dotgcr &= ~(U2DOTGCR_SMAF | U2DOTGCR_CKAF);
204 u2d_writel(U2DOTGCR, u2dotgcr);
206 u2d_writel(U2DOTGCR, u2dotgcr | U2DOTGCR_ULE);
208 u2d_writel(U2DOTGICR, u2d_readl(U2DOTGICR) & ~0x37F7F);
211 static int pxa310_otg_init(struct pxa3xx_u2d_platform_data *pdata)
213 unsigned int ulpi_mode = ULPI_OTG_DRVVBUS;
216 if (pdata->ulpi_mode & ULPI_SER_6PIN)
217 ulpi_mode |= ULPI_IC_6PIN_SERIAL;
218 else if (pdata->ulpi_mode & ULPI_SER_3PIN)
219 ulpi_mode |= ULPI_IC_3PIN_SERIAL;
222 u2d->ulpi_mode = ulpi_mode;
224 u2d->otg = otg_ulpi_create(&pxa310_ulpi_access_ops, ulpi_mode);
228 u2d->otg->io_priv = u2d->mmio_base;
233 static void pxa310_otg_exit(void)
238 static inline void pxa310_u2d_setup_otg_hc(void) {}
239 static inline int pxa310_start_otg_hc(struct usb_bus *host)
243 static inline void pxa310_stop_otg_hc(void) {}
244 static inline int pxa310_otg_init(struct pxa3xx_u2d_platform_data *pdata)
248 static inline void pxa310_otg_exit(void) {}
249 #endif /* CONFIG_PXA310_ULPI */
251 int pxa3xx_u2d_start_hc(struct usb_bus *host)
255 /* In case the PXA3xx ULPI isn't used, do nothing. */
259 clk_enable(u2d->clk);
261 if (cpu_is_pxa310()) {
262 pxa310_u2d_setup_otg_hc();
263 err = pxa310_start_otg_hc(host);
268 EXPORT_SYMBOL_GPL(pxa3xx_u2d_start_hc);
270 void pxa3xx_u2d_stop_hc(struct usb_bus *host)
272 /* In case the PXA3xx ULPI isn't used, do nothing. */
277 pxa310_stop_otg_hc();
279 clk_disable(u2d->clk);
281 EXPORT_SYMBOL_GPL(pxa3xx_u2d_stop_hc);
283 static int pxa3xx_u2d_probe(struct platform_device *pdev)
285 struct pxa3xx_u2d_platform_data *pdata = pdev->dev.platform_data;
289 u2d = kzalloc(sizeof(struct pxa3xx_u2d_ulpi), GFP_KERNEL);
291 dev_err(&pdev->dev, "failed to allocate memory\n");
295 u2d->clk = clk_get(&pdev->dev, NULL);
296 if (IS_ERR(u2d->clk)) {
297 dev_err(&pdev->dev, "failed to get u2d clock\n");
298 err = PTR_ERR(u2d->clk);
302 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
304 dev_err(&pdev->dev, "no IO memory resource defined\n");
309 r = request_mem_region(r->start, resource_size(r), pdev->name);
311 dev_err(&pdev->dev, "failed to request memory resource\n");
316 u2d->mmio_base = ioremap(r->start, resource_size(r));
317 if (!u2d->mmio_base) {
318 dev_err(&pdev->dev, "ioremap() failed\n");
324 err = pdata->init(&pdev->dev);
329 /* Only PXA310 U2D has OTG functionality */
330 if (cpu_is_pxa310()) {
331 err = pxa310_otg_init(pdata);
336 platform_set_drvdata(pdev, &u2d);
342 pdata->exit(&pdev->dev);
344 iounmap(u2d->mmio_base);
346 release_mem_region(r->start, resource_size(r));
354 static int pxa3xx_u2d_remove(struct platform_device *pdev)
356 struct pxa3xx_u2d_platform_data *pdata = pdev->dev.platform_data;
359 if (cpu_is_pxa310()) {
360 pxa310_stop_otg_hc();
365 pdata->exit(&pdev->dev);
367 platform_set_drvdata(pdev, NULL);
368 iounmap(u2d->mmio_base);
369 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
370 release_mem_region(r->start, resource_size(r));
379 static struct platform_driver pxa3xx_u2d_ulpi_driver = {
381 .name = "pxa3xx-u2d",
382 .owner = THIS_MODULE,
384 .probe = pxa3xx_u2d_probe,
385 .remove = pxa3xx_u2d_remove,
387 module_platform_driver(pxa3xx_u2d_ulpi_driver);
389 MODULE_DESCRIPTION("PXA3xx U2D ULPI driver");
390 MODULE_AUTHOR("Igor Grinberg");
391 MODULE_LICENSE("GPL v2");