1 /* 2 * Allwinner SUNXI "glue layer" 3 * 4 * Copyright © 2015 Hans de Goede <hdegoede@redhat.com> 5 * Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi> 6 * 7 * Based on the sw_usb "Allwinner OTG Dual Role Controller" code. 8 * Copyright 2007-2012 (C) Allwinner Technology Co., Ltd. 9 * javen <javen@allwinnertech.com> 10 * 11 * Based on the DA8xx "glue layer" code. 12 * Copyright (c) 2008-2009 MontaVista Software, Inc. <source@mvista.com> 13 * Copyright (C) 2005-2006 by Texas Instruments 14 * 15 * This file is part of the Inventra Controller Driver for Linux. 16 * 17 * The Inventra Controller Driver for Linux is free software; you 18 * can redistribute it and/or modify it under the terms of the GNU 19 * General Public License version 2 as published by the Free Software 20 * Foundation. 21 * 22 */ 23 #include <common.h> 24 #include <asm/arch/cpu.h> 25 #include <asm/arch/clock.h> 26 #include <asm/arch/gpio.h> 27 #include <asm/arch/usb_phy.h> 28 #include <asm-generic/gpio.h> 29 #include <dm/lists.h> 30 #include <dm/root.h> 31 #include <linux/usb/musb.h> 32 #include "linux-compat.h" 33 #include "musb_core.h" 34 #include "musb_uboot.h" 35 36 /****************************************************************************** 37 ****************************************************************************** 38 * From the Allwinner driver 39 ****************************************************************************** 40 ******************************************************************************/ 41 42 /****************************************************************************** 43 * From include/sunxi_usb_bsp.h 44 ******************************************************************************/ 45 46 /* reg offsets */ 47 #define USBC_REG_o_ISCR 0x0400 48 #define USBC_REG_o_PHYCTL 0x0404 49 #define USBC_REG_o_PHYBIST 0x0408 50 #define USBC_REG_o_PHYTUNE 0x040c 51 52 #define USBC_REG_o_VEND0 0x0043 53 54 /* Interface Status and Control */ 55 #define USBC_BP_ISCR_VBUS_VALID_FROM_DATA 30 56 #define USBC_BP_ISCR_VBUS_VALID_FROM_VBUS 29 57 #define USBC_BP_ISCR_EXT_ID_STATUS 28 58 #define USBC_BP_ISCR_EXT_DM_STATUS 27 59 #define USBC_BP_ISCR_EXT_DP_STATUS 26 60 #define USBC_BP_ISCR_MERGED_VBUS_STATUS 25 61 #define USBC_BP_ISCR_MERGED_ID_STATUS 24 62 63 #define USBC_BP_ISCR_ID_PULLUP_EN 17 64 #define USBC_BP_ISCR_DPDM_PULLUP_EN 16 65 #define USBC_BP_ISCR_FORCE_ID 14 66 #define USBC_BP_ISCR_FORCE_VBUS_VALID 12 67 #define USBC_BP_ISCR_VBUS_VALID_SRC 10 68 69 #define USBC_BP_ISCR_HOSC_EN 7 70 #define USBC_BP_ISCR_VBUS_CHANGE_DETECT 6 71 #define USBC_BP_ISCR_ID_CHANGE_DETECT 5 72 #define USBC_BP_ISCR_DPDM_CHANGE_DETECT 4 73 #define USBC_BP_ISCR_IRQ_ENABLE 3 74 #define USBC_BP_ISCR_VBUS_CHANGE_DETECT_EN 2 75 #define USBC_BP_ISCR_ID_CHANGE_DETECT_EN 1 76 #define USBC_BP_ISCR_DPDM_CHANGE_DETECT_EN 0 77 78 /****************************************************************************** 79 * From usbc/usbc.c 80 ******************************************************************************/ 81 82 static u32 USBC_WakeUp_ClearChangeDetect(u32 reg_val) 83 { 84 u32 temp = reg_val; 85 86 temp &= ~(1 << USBC_BP_ISCR_VBUS_CHANGE_DETECT); 87 temp &= ~(1 << USBC_BP_ISCR_ID_CHANGE_DETECT); 88 temp &= ~(1 << USBC_BP_ISCR_DPDM_CHANGE_DETECT); 89 90 return temp; 91 } 92 93 static void USBC_EnableIdPullUp(__iomem void *base) 94 { 95 u32 reg_val; 96 97 reg_val = musb_readl(base, USBC_REG_o_ISCR); 98 reg_val |= (1 << USBC_BP_ISCR_ID_PULLUP_EN); 99 reg_val = USBC_WakeUp_ClearChangeDetect(reg_val); 100 musb_writel(base, USBC_REG_o_ISCR, reg_val); 101 } 102 103 static void USBC_EnableDpDmPullUp(__iomem void *base) 104 { 105 u32 reg_val; 106 107 reg_val = musb_readl(base, USBC_REG_o_ISCR); 108 reg_val |= (1 << USBC_BP_ISCR_DPDM_PULLUP_EN); 109 reg_val = USBC_WakeUp_ClearChangeDetect(reg_val); 110 musb_writel(base, USBC_REG_o_ISCR, reg_val); 111 } 112 113 static void USBC_ForceIdToLow(__iomem void *base) 114 { 115 u32 reg_val; 116 117 reg_val = musb_readl(base, USBC_REG_o_ISCR); 118 reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_ID); 119 reg_val |= (0x02 << USBC_BP_ISCR_FORCE_ID); 120 reg_val = USBC_WakeUp_ClearChangeDetect(reg_val); 121 musb_writel(base, USBC_REG_o_ISCR, reg_val); 122 } 123 124 static void USBC_ForceIdToHigh(__iomem void *base) 125 { 126 u32 reg_val; 127 128 reg_val = musb_readl(base, USBC_REG_o_ISCR); 129 reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_ID); 130 reg_val |= (0x03 << USBC_BP_ISCR_FORCE_ID); 131 reg_val = USBC_WakeUp_ClearChangeDetect(reg_val); 132 musb_writel(base, USBC_REG_o_ISCR, reg_val); 133 } 134 135 static void USBC_ForceVbusValidToLow(__iomem void *base) 136 { 137 u32 reg_val; 138 139 reg_val = musb_readl(base, USBC_REG_o_ISCR); 140 reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_VBUS_VALID); 141 reg_val |= (0x02 << USBC_BP_ISCR_FORCE_VBUS_VALID); 142 reg_val = USBC_WakeUp_ClearChangeDetect(reg_val); 143 musb_writel(base, USBC_REG_o_ISCR, reg_val); 144 } 145 146 static void USBC_ForceVbusValidToHigh(__iomem void *base) 147 { 148 u32 reg_val; 149 150 reg_val = musb_readl(base, USBC_REG_o_ISCR); 151 reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_VBUS_VALID); 152 reg_val |= (0x03 << USBC_BP_ISCR_FORCE_VBUS_VALID); 153 reg_val = USBC_WakeUp_ClearChangeDetect(reg_val); 154 musb_writel(base, USBC_REG_o_ISCR, reg_val); 155 } 156 157 static void USBC_ConfigFIFO_Base(void) 158 { 159 u32 reg_value; 160 161 /* config usb fifo, 8kb mode */ 162 reg_value = readl(SUNXI_SRAMC_BASE + 0x04); 163 reg_value &= ~(0x03 << 0); 164 reg_value |= (1 << 0); 165 writel(reg_value, SUNXI_SRAMC_BASE + 0x04); 166 } 167 168 /****************************************************************************** 169 * MUSB Glue code 170 ******************************************************************************/ 171 172 static irqreturn_t sunxi_musb_interrupt(int irq, void *__hci) 173 { 174 struct musb *musb = __hci; 175 irqreturn_t retval = IRQ_NONE; 176 177 /* read and flush interrupts */ 178 musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); 179 if (musb->int_usb) 180 musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb); 181 musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); 182 if (musb->int_tx) 183 musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx); 184 musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); 185 if (musb->int_rx) 186 musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx); 187 188 if (musb->int_usb || musb->int_tx || musb->int_rx) 189 retval |= musb_interrupt(musb); 190 191 return retval; 192 } 193 194 /* musb_core does not call enable / disable in a balanced manner <sigh> */ 195 static bool enabled = false; 196 197 static int sunxi_musb_enable(struct musb *musb) 198 { 199 int ret; 200 201 pr_debug("%s():\n", __func__); 202 203 musb_ep_select(musb->mregs, 0); 204 musb_writeb(musb->mregs, MUSB_FADDR, 0); 205 206 if (enabled) 207 return 0; 208 209 /* select PIO mode */ 210 musb_writeb(musb->mregs, USBC_REG_o_VEND0, 0); 211 212 if (is_host_enabled(musb)) { 213 ret = sunxi_usb_phy_vbus_detect(0); 214 if (ret == 1) { 215 printf("A charger is plugged into the OTG: "); 216 return -ENODEV; 217 } 218 ret = sunxi_usb_phy_id_detect(0); 219 if (ret == 1) { 220 printf("No host cable detected: "); 221 return -ENODEV; 222 } 223 sunxi_usb_phy_power_on(0); /* port power on */ 224 } 225 226 USBC_ForceVbusValidToHigh(musb->mregs); 227 228 enabled = true; 229 return 0; 230 } 231 232 static void sunxi_musb_disable(struct musb *musb) 233 { 234 pr_debug("%s():\n", __func__); 235 236 if (!enabled) 237 return; 238 239 if (is_host_enabled(musb)) 240 sunxi_usb_phy_power_off(0); /* port power off */ 241 242 USBC_ForceVbusValidToLow(musb->mregs); 243 mdelay(200); /* Wait for the current session to timeout */ 244 245 enabled = false; 246 } 247 248 static int sunxi_musb_init(struct musb *musb) 249 { 250 struct sunxi_ccm_reg *ccm = (struct sunxi_ccm_reg *)SUNXI_CCM_BASE; 251 252 pr_debug("%s():\n", __func__); 253 254 musb->isr = sunxi_musb_interrupt; 255 256 setbits_le32(&ccm->ahb_gate0, 1 << AHB_GATE_OFFSET_USB0); 257 #ifdef CONFIG_SUNXI_GEN_SUN6I 258 setbits_le32(&ccm->ahb_reset0_cfg, 1 << AHB_GATE_OFFSET_USB0); 259 #endif 260 sunxi_usb_phy_init(0); 261 262 USBC_ConfigFIFO_Base(); 263 USBC_EnableDpDmPullUp(musb->mregs); 264 USBC_EnableIdPullUp(musb->mregs); 265 266 if (is_host_enabled(musb)) { 267 /* Host mode */ 268 USBC_ForceIdToLow(musb->mregs); 269 } else { 270 /* Peripheral mode */ 271 USBC_ForceIdToHigh(musb->mregs); 272 } 273 USBC_ForceVbusValidToHigh(musb->mregs); 274 275 return 0; 276 } 277 278 static const struct musb_platform_ops sunxi_musb_ops = { 279 .init = sunxi_musb_init, 280 .enable = sunxi_musb_enable, 281 .disable = sunxi_musb_disable, 282 }; 283 284 static struct musb_hdrc_config musb_config = { 285 .multipoint = 1, 286 .dyn_fifo = 1, 287 .num_eps = 6, 288 .ram_bits = 11, 289 }; 290 291 static struct musb_hdrc_platform_data musb_plat = { 292 #if defined(CONFIG_USB_MUSB_HOST) 293 .mode = MUSB_HOST, 294 #else 295 .mode = MUSB_PERIPHERAL, 296 #endif 297 .config = &musb_config, 298 .power = 250, 299 .platform_ops = &sunxi_musb_ops, 300 }; 301 302 #ifdef CONFIG_USB_MUSB_HOST 303 int musb_usb_probe(struct udevice *dev) 304 { 305 struct musb_host_data *host = dev_get_priv(dev); 306 struct usb_bus_priv *priv = dev_get_uclass_priv(dev); 307 int ret; 308 309 priv->desc_before_addr = true; 310 311 if (!host->host) { 312 host->host = musb_init_controller(&musb_plat, NULL, 313 (void *)SUNXI_USB0_BASE); 314 if (!host->host) 315 return -EIO; 316 } 317 318 ret = musb_lowlevel_init(host); 319 if (ret == 0) 320 printf("MUSB OTG\n"); 321 322 return ret; 323 } 324 325 int musb_usb_remove(struct udevice *dev) 326 { 327 struct musb_host_data *host = dev_get_priv(dev); 328 329 musb_stop(host->host); 330 331 return 0; 332 } 333 334 U_BOOT_DRIVER(usb_musb) = { 335 .name = "sunxi-musb", 336 .id = UCLASS_USB, 337 .probe = musb_usb_probe, 338 .remove = musb_usb_remove, 339 .ops = &musb_usb_ops, 340 .platdata_auto_alloc_size = sizeof(struct usb_platdata), 341 .priv_auto_alloc_size = sizeof(struct musb_host_data), 342 }; 343 #endif 344 345 void sunxi_musb_board_init(void) 346 { 347 #ifdef CONFIG_USB_MUSB_HOST 348 struct udevice *dev; 349 350 /* 351 * Bind the driver directly for now as musb linux kernel support is 352 * still pending upstream so our dts files do not have the necessary 353 * nodes yet. TODO: Remove this as soon as the dts nodes are in place 354 * and bind by compatible instead. 355 */ 356 device_bind_driver(dm_root(), "sunxi-musb", "sunxi-musb", &dev); 357 #else 358 musb_register(&musb_plat, NULL, (void *)SUNXI_USB0_BASE); 359 #endif 360 } 361