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 * SPDX-License-Identifier: GPL-2.0 18 */ 19 #include <common.h> 20 #include <asm/arch/cpu.h> 21 #include <asm/arch/clock.h> 22 #include <asm/arch/gpio.h> 23 #include <asm/arch/usb_phy.h> 24 #include <asm-generic/gpio.h> 25 #include <dm/lists.h> 26 #include <dm/root.h> 27 #include <linux/usb/musb.h> 28 #include "linux-compat.h" 29 #include "musb_core.h" 30 #include "musb_uboot.h" 31 32 /****************************************************************************** 33 ****************************************************************************** 34 * From the Allwinner driver 35 ****************************************************************************** 36 ******************************************************************************/ 37 38 /****************************************************************************** 39 * From include/sunxi_usb_bsp.h 40 ******************************************************************************/ 41 42 /* reg offsets */ 43 #define USBC_REG_o_ISCR 0x0400 44 #define USBC_REG_o_PHYCTL 0x0404 45 #define USBC_REG_o_PHYBIST 0x0408 46 #define USBC_REG_o_PHYTUNE 0x040c 47 48 #define USBC_REG_o_VEND0 0x0043 49 50 /* Interface Status and Control */ 51 #define USBC_BP_ISCR_VBUS_VALID_FROM_DATA 30 52 #define USBC_BP_ISCR_VBUS_VALID_FROM_VBUS 29 53 #define USBC_BP_ISCR_EXT_ID_STATUS 28 54 #define USBC_BP_ISCR_EXT_DM_STATUS 27 55 #define USBC_BP_ISCR_EXT_DP_STATUS 26 56 #define USBC_BP_ISCR_MERGED_VBUS_STATUS 25 57 #define USBC_BP_ISCR_MERGED_ID_STATUS 24 58 59 #define USBC_BP_ISCR_ID_PULLUP_EN 17 60 #define USBC_BP_ISCR_DPDM_PULLUP_EN 16 61 #define USBC_BP_ISCR_FORCE_ID 14 62 #define USBC_BP_ISCR_FORCE_VBUS_VALID 12 63 #define USBC_BP_ISCR_VBUS_VALID_SRC 10 64 65 #define USBC_BP_ISCR_HOSC_EN 7 66 #define USBC_BP_ISCR_VBUS_CHANGE_DETECT 6 67 #define USBC_BP_ISCR_ID_CHANGE_DETECT 5 68 #define USBC_BP_ISCR_DPDM_CHANGE_DETECT 4 69 #define USBC_BP_ISCR_IRQ_ENABLE 3 70 #define USBC_BP_ISCR_VBUS_CHANGE_DETECT_EN 2 71 #define USBC_BP_ISCR_ID_CHANGE_DETECT_EN 1 72 #define USBC_BP_ISCR_DPDM_CHANGE_DETECT_EN 0 73 74 /****************************************************************************** 75 * From usbc/usbc.c 76 ******************************************************************************/ 77 78 static u32 USBC_WakeUp_ClearChangeDetect(u32 reg_val) 79 { 80 u32 temp = reg_val; 81 82 temp &= ~(1 << USBC_BP_ISCR_VBUS_CHANGE_DETECT); 83 temp &= ~(1 << USBC_BP_ISCR_ID_CHANGE_DETECT); 84 temp &= ~(1 << USBC_BP_ISCR_DPDM_CHANGE_DETECT); 85 86 return temp; 87 } 88 89 static void USBC_EnableIdPullUp(__iomem void *base) 90 { 91 u32 reg_val; 92 93 reg_val = musb_readl(base, USBC_REG_o_ISCR); 94 reg_val |= (1 << USBC_BP_ISCR_ID_PULLUP_EN); 95 reg_val = USBC_WakeUp_ClearChangeDetect(reg_val); 96 musb_writel(base, USBC_REG_o_ISCR, reg_val); 97 } 98 99 static void USBC_EnableDpDmPullUp(__iomem void *base) 100 { 101 u32 reg_val; 102 103 reg_val = musb_readl(base, USBC_REG_o_ISCR); 104 reg_val |= (1 << USBC_BP_ISCR_DPDM_PULLUP_EN); 105 reg_val = USBC_WakeUp_ClearChangeDetect(reg_val); 106 musb_writel(base, USBC_REG_o_ISCR, reg_val); 107 } 108 109 static void USBC_ForceIdToLow(__iomem void *base) 110 { 111 u32 reg_val; 112 113 reg_val = musb_readl(base, USBC_REG_o_ISCR); 114 reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_ID); 115 reg_val |= (0x02 << USBC_BP_ISCR_FORCE_ID); 116 reg_val = USBC_WakeUp_ClearChangeDetect(reg_val); 117 musb_writel(base, USBC_REG_o_ISCR, reg_val); 118 } 119 120 static void USBC_ForceIdToHigh(__iomem void *base) 121 { 122 u32 reg_val; 123 124 reg_val = musb_readl(base, USBC_REG_o_ISCR); 125 reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_ID); 126 reg_val |= (0x03 << USBC_BP_ISCR_FORCE_ID); 127 reg_val = USBC_WakeUp_ClearChangeDetect(reg_val); 128 musb_writel(base, USBC_REG_o_ISCR, reg_val); 129 } 130 131 static void USBC_ForceVbusValidToLow(__iomem void *base) 132 { 133 u32 reg_val; 134 135 reg_val = musb_readl(base, USBC_REG_o_ISCR); 136 reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_VBUS_VALID); 137 reg_val |= (0x02 << USBC_BP_ISCR_FORCE_VBUS_VALID); 138 reg_val = USBC_WakeUp_ClearChangeDetect(reg_val); 139 musb_writel(base, USBC_REG_o_ISCR, reg_val); 140 } 141 142 static void USBC_ForceVbusValidToHigh(__iomem void *base) 143 { 144 u32 reg_val; 145 146 reg_val = musb_readl(base, USBC_REG_o_ISCR); 147 reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_VBUS_VALID); 148 reg_val |= (0x03 << USBC_BP_ISCR_FORCE_VBUS_VALID); 149 reg_val = USBC_WakeUp_ClearChangeDetect(reg_val); 150 musb_writel(base, USBC_REG_o_ISCR, reg_val); 151 } 152 153 static void USBC_ConfigFIFO_Base(void) 154 { 155 u32 reg_value; 156 157 /* config usb fifo, 8kb mode */ 158 reg_value = readl(SUNXI_SRAMC_BASE + 0x04); 159 reg_value &= ~(0x03 << 0); 160 reg_value |= (1 << 0); 161 writel(reg_value, SUNXI_SRAMC_BASE + 0x04); 162 } 163 164 /****************************************************************************** 165 * Needed for the DFU polling magic 166 ******************************************************************************/ 167 168 static u8 last_int_usb; 169 170 bool dfu_usb_get_reset(void) 171 { 172 return !!(last_int_usb & MUSB_INTR_RESET); 173 } 174 175 /****************************************************************************** 176 * MUSB Glue code 177 ******************************************************************************/ 178 179 static irqreturn_t sunxi_musb_interrupt(int irq, void *__hci) 180 { 181 struct musb *musb = __hci; 182 irqreturn_t retval = IRQ_NONE; 183 184 /* read and flush interrupts */ 185 musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); 186 last_int_usb = musb->int_usb; 187 if (musb->int_usb) 188 musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb); 189 musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); 190 if (musb->int_tx) 191 musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx); 192 musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); 193 if (musb->int_rx) 194 musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx); 195 196 if (musb->int_usb || musb->int_tx || musb->int_rx) 197 retval |= musb_interrupt(musb); 198 199 return retval; 200 } 201 202 /* musb_core does not call enable / disable in a balanced manner <sigh> */ 203 static bool enabled = false; 204 static struct musb *sunxi_musb; 205 206 static int sunxi_musb_enable(struct musb *musb) 207 { 208 pr_debug("%s():\n", __func__); 209 210 musb_ep_select(musb->mregs, 0); 211 musb_writeb(musb->mregs, MUSB_FADDR, 0); 212 213 if (enabled) 214 return 0; 215 216 /* select PIO mode */ 217 musb_writeb(musb->mregs, USBC_REG_o_VEND0, 0); 218 219 if (is_host_enabled(musb)) { 220 int id = sunxi_usb_phy_id_detect(0); 221 222 if (id == 1 && sunxi_usb_phy_power_is_on(0)) 223 sunxi_usb_phy_power_off(0); 224 225 if (!sunxi_usb_phy_power_is_on(0)) { 226 int vbus = sunxi_usb_phy_vbus_detect(0); 227 if (vbus == 1) { 228 printf("A charger is plugged into the OTG: "); 229 return -ENODEV; 230 } 231 } 232 233 if (id == 1) { 234 printf("No host cable detected: "); 235 return -ENODEV; 236 } 237 238 if (!sunxi_usb_phy_power_is_on(0)) 239 sunxi_usb_phy_power_on(0); 240 } 241 242 USBC_ForceVbusValidToHigh(musb->mregs); 243 244 enabled = true; 245 return 0; 246 } 247 248 static void sunxi_musb_disable(struct musb *musb) 249 { 250 pr_debug("%s():\n", __func__); 251 252 if (!enabled) 253 return; 254 255 USBC_ForceVbusValidToLow(musb->mregs); 256 mdelay(200); /* Wait for the current session to timeout */ 257 258 enabled = false; 259 } 260 261 static int sunxi_musb_init(struct musb *musb) 262 { 263 struct sunxi_ccm_reg *ccm = (struct sunxi_ccm_reg *)SUNXI_CCM_BASE; 264 265 pr_debug("%s():\n", __func__); 266 267 musb->isr = sunxi_musb_interrupt; 268 269 setbits_le32(&ccm->ahb_gate0, 1 << AHB_GATE_OFFSET_USB0); 270 #ifdef CONFIG_SUNXI_GEN_SUN6I 271 setbits_le32(&ccm->ahb_reset0_cfg, 1 << AHB_GATE_OFFSET_USB0); 272 #endif 273 sunxi_usb_phy_init(0); 274 275 USBC_ConfigFIFO_Base(); 276 USBC_EnableDpDmPullUp(musb->mregs); 277 USBC_EnableIdPullUp(musb->mregs); 278 279 if (is_host_enabled(musb)) { 280 /* Host mode */ 281 USBC_ForceIdToLow(musb->mregs); 282 } else { 283 /* Peripheral mode */ 284 USBC_ForceIdToHigh(musb->mregs); 285 } 286 USBC_ForceVbusValidToHigh(musb->mregs); 287 288 return 0; 289 } 290 291 static const struct musb_platform_ops sunxi_musb_ops = { 292 .init = sunxi_musb_init, 293 .enable = sunxi_musb_enable, 294 .disable = sunxi_musb_disable, 295 }; 296 297 static struct musb_hdrc_config musb_config = { 298 .multipoint = 1, 299 .dyn_fifo = 1, 300 .num_eps = 6, 301 .ram_bits = 11, 302 }; 303 304 static struct musb_hdrc_platform_data musb_plat = { 305 #if defined(CONFIG_USB_MUSB_HOST) 306 .mode = MUSB_HOST, 307 #else 308 .mode = MUSB_PERIPHERAL, 309 #endif 310 .config = &musb_config, 311 .power = 250, 312 .platform_ops = &sunxi_musb_ops, 313 }; 314 315 #ifdef CONFIG_USB_MUSB_HOST 316 int musb_usb_probe(struct udevice *dev) 317 { 318 struct musb_host_data *host = dev_get_priv(dev); 319 struct usb_bus_priv *priv = dev_get_uclass_priv(dev); 320 int ret; 321 322 priv->desc_before_addr = true; 323 324 if (!sunxi_musb) { 325 sunxi_musb = musb_init_controller(&musb_plat, NULL, 326 (void *)SUNXI_USB0_BASE); 327 } 328 329 host->host = sunxi_musb; 330 if (!host->host) 331 return -EIO; 332 333 ret = musb_lowlevel_init(host); 334 if (ret == 0) 335 printf("MUSB OTG\n"); 336 337 return ret; 338 } 339 340 int musb_usb_remove(struct udevice *dev) 341 { 342 struct musb_host_data *host = dev_get_priv(dev); 343 344 musb_stop(host->host); 345 346 return 0; 347 } 348 349 U_BOOT_DRIVER(usb_musb) = { 350 .name = "sunxi-musb", 351 .id = UCLASS_USB, 352 .probe = musb_usb_probe, 353 .remove = musb_usb_remove, 354 .ops = &musb_usb_ops, 355 .platdata_auto_alloc_size = sizeof(struct usb_platdata), 356 .priv_auto_alloc_size = sizeof(struct musb_host_data), 357 }; 358 #endif 359 360 void sunxi_musb_board_init(void) 361 { 362 #ifdef CONFIG_USB_MUSB_HOST 363 struct udevice *dev; 364 365 /* 366 * Bind the driver directly for now as musb linux kernel support is 367 * still pending upstream so our dts files do not have the necessary 368 * nodes yet. TODO: Remove this as soon as the dts nodes are in place 369 * and bind by compatible instead. 370 */ 371 device_bind_driver(dm_root(), "sunxi-musb", "sunxi-musb", &dev); 372 #else 373 musb_register(&musb_plat, NULL, (void *)SUNXI_USB0_BASE); 374 #endif 375 } 376