Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Texas Instruments da8xx "glue layer" |
| 4 | * |
| 5 | * Copyright (c) 2019, by Texas Instruments |
| 6 | * |
| 7 | * Based on the DA8xx "glue layer" code. |
| 8 | * Copyright (c) 2008-2019, MontaVista Software, Inc. <source@mvista.com> |
| 9 | * |
| 10 | * DT support |
| 11 | * Copyright (c) 2016 Petr Kulhavy <petr@barix.com> |
| 12 | * This file is part of the Inventra Controller Driver for Linux. |
| 13 | * |
| 14 | */ |
| 15 | |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 16 | #include <dm.h> |
Simon Glass | 0f2af88 | 2020-05-10 11:40:05 -0600 | [diff] [blame] | 17 | #include <log.h> |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 18 | #include <dm/device-internal.h> |
Simon Glass | 9bc1564 | 2020-02-03 07:36:16 -0700 | [diff] [blame] | 19 | #include <dm/device_compat.h> |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 20 | #include <dm/lists.h> |
| 21 | #include <asm/arch/hardware.h> |
| 22 | #include <asm/arch/da8xx-usb.h> |
Simon Glass | dbd7954 | 2020-05-10 11:40:11 -0600 | [diff] [blame] | 23 | #include <linux/delay.h> |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 24 | #include <linux/usb/otg.h> |
Simon Glass | 3ba929a | 2020-10-30 21:38:53 -0600 | [diff] [blame] | 25 | #include <asm/global_data.h> |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 26 | #include <asm/omap_musb.h> |
| 27 | #include <generic-phy.h> |
| 28 | #include "linux-compat.h" |
| 29 | #include "musb_core.h" |
| 30 | #include "musb_uboot.h" |
| 31 | |
| 32 | /* USB 2.0 OTG module registers */ |
| 33 | #define DA8XX_USB_REVISION_REG 0x00 |
| 34 | #define DA8XX_USB_CTRL_REG 0x04 |
| 35 | #define DA8XX_USB_STAT_REG 0x08 |
| 36 | #define DA8XX_USB_EMULATION_REG 0x0c |
| 37 | #define DA8XX_USB_SRP_FIX_TIME_REG 0x18 |
| 38 | #define DA8XX_USB_INTR_SRC_REG 0x20 |
| 39 | #define DA8XX_USB_INTR_SRC_SET_REG 0x24 |
| 40 | #define DA8XX_USB_INTR_SRC_CLEAR_REG 0x28 |
| 41 | #define DA8XX_USB_INTR_MASK_REG 0x2c |
| 42 | #define DA8XX_USB_INTR_MASK_SET_REG 0x30 |
| 43 | #define DA8XX_USB_INTR_MASK_CLEAR_REG 0x34 |
| 44 | #define DA8XX_USB_INTR_SRC_MASKED_REG 0x38 |
| 45 | #define DA8XX_USB_END_OF_INTR_REG 0x3c |
| 46 | #define DA8XX_USB_GENERIC_RNDIS_EP_SIZE_REG(n) (0x50 + (((n) - 1) << 2)) |
| 47 | |
| 48 | /* Control register bits */ |
| 49 | #define DA8XX_SOFT_RESET_MASK 1 |
| 50 | |
| 51 | #define DA8XX_USB_TX_EP_MASK 0x1f /* EP0 + 4 Tx EPs */ |
| 52 | #define DA8XX_USB_RX_EP_MASK 0x1e /* 4 Rx EPs */ |
| 53 | |
| 54 | /* USB interrupt register bits */ |
| 55 | #define DA8XX_INTR_USB_SHIFT 16 |
| 56 | #define DA8XX_INTR_USB_MASK (0x1ff << DA8XX_INTR_USB_SHIFT) /* 8 Mentor */ |
| 57 | /* interrupts and DRVVBUS interrupt */ |
| 58 | #define DA8XX_INTR_DRVVBUS 0x100 |
| 59 | #define DA8XX_INTR_RX_SHIFT 8 |
| 60 | #define DA8XX_INTR_RX_MASK (DA8XX_USB_RX_EP_MASK << DA8XX_INTR_RX_SHIFT) |
| 61 | #define DA8XX_INTR_TX_SHIFT 0 |
| 62 | #define DA8XX_INTR_TX_MASK (DA8XX_USB_TX_EP_MASK << DA8XX_INTR_TX_SHIFT) |
| 63 | |
| 64 | #define DA8XX_MENTOR_CORE_OFFSET 0x400 |
| 65 | |
| 66 | static irqreturn_t da8xx_musb_interrupt(int irq, void *hci) |
| 67 | { |
| 68 | struct musb *musb = hci; |
| 69 | void __iomem *reg_base = musb->ctrl_base; |
| 70 | unsigned long flags; |
| 71 | irqreturn_t ret = IRQ_NONE; |
| 72 | u32 status; |
| 73 | |
| 74 | spin_lock_irqsave(&musb->lock, flags); |
| 75 | |
| 76 | /* |
| 77 | * NOTE: DA8XX shadows the Mentor IRQs. Don't manage them through |
| 78 | * the Mentor registers (except for setup), use the TI ones and EOI. |
| 79 | */ |
| 80 | |
| 81 | /* Acknowledge and handle non-CPPI interrupts */ |
| 82 | status = musb_readl(reg_base, DA8XX_USB_INTR_SRC_MASKED_REG); |
| 83 | if (!status) |
| 84 | goto eoi; |
| 85 | |
| 86 | musb_writel(reg_base, DA8XX_USB_INTR_SRC_CLEAR_REG, status); |
| 87 | dev_dbg(musb->controller, "USB IRQ %08x\n", status); |
| 88 | |
| 89 | musb->int_rx = (status & DA8XX_INTR_RX_MASK) >> DA8XX_INTR_RX_SHIFT; |
| 90 | musb->int_tx = (status & DA8XX_INTR_TX_MASK) >> DA8XX_INTR_TX_SHIFT; |
| 91 | musb->int_usb = (status & DA8XX_INTR_USB_MASK) >> DA8XX_INTR_USB_SHIFT; |
| 92 | |
| 93 | /* |
| 94 | * DRVVBUS IRQs are the only proxy we have (a very poor one!) for |
| 95 | * DA8xx's missing ID change IRQ. We need an ID change IRQ to |
| 96 | * switch appropriately between halves of the OTG state machine. |
| 97 | * Managing DEVCTL.Session per Mentor docs requires that we know its |
| 98 | * value but DEVCTL.BDevice is invalid without DEVCTL.Session set. |
| 99 | * Also, DRVVBUS pulses for SRP (but not at 5 V)... |
| 100 | */ |
| 101 | if (status & (DA8XX_INTR_DRVVBUS << DA8XX_INTR_USB_SHIFT)) { |
| 102 | int drvvbus = musb_readl(reg_base, DA8XX_USB_STAT_REG); |
| 103 | void __iomem *mregs = musb->mregs; |
| 104 | u8 devctl = musb_readb(mregs, MUSB_DEVCTL); |
| 105 | int err; |
| 106 | |
| 107 | err = musb->int_usb & MUSB_INTR_VBUSERROR; |
| 108 | if (err) { |
| 109 | /* |
| 110 | * The Mentor core doesn't debounce VBUS as needed |
| 111 | * to cope with device connect current spikes. This |
| 112 | * means it's not uncommon for bus-powered devices |
| 113 | * to get VBUS errors during enumeration. |
| 114 | * |
| 115 | * This is a workaround, but newer RTL from Mentor |
| 116 | * seems to allow a better one: "re"-starting sessions |
| 117 | * without waiting for VBUS to stop registering in |
| 118 | * devctl. |
| 119 | */ |
| 120 | musb->int_usb &= ~MUSB_INTR_VBUSERROR; |
| 121 | WARNING("VBUS error workaround (delay coming)\n"); |
| 122 | } else if (drvvbus) { |
| 123 | MUSB_HST_MODE(musb); |
| 124 | musb->port1_status |= USB_PORT_STAT_POWER; |
| 125 | } else if (!(musb->int_usb & MUSB_INTR_BABBLE)) { |
| 126 | /* |
| 127 | * When babble condition happens, drvvbus interrupt |
| 128 | * is also generated. Ignore this drvvbus interrupt |
| 129 | * and let babble interrupt handler recovers the |
| 130 | * controller; otherwise, the host-mode flag is lost |
| 131 | * due to the MUSB_DEV_MODE() call below and babble |
| 132 | * recovery logic will not be called. |
| 133 | */ |
| 134 | musb->is_active = 0; |
| 135 | MUSB_DEV_MODE(musb); |
| 136 | musb->port1_status &= ~USB_PORT_STAT_POWER; |
| 137 | } |
| 138 | ret = IRQ_HANDLED; |
| 139 | } |
| 140 | |
| 141 | if (musb->int_tx || musb->int_rx || musb->int_usb) |
| 142 | ret |= musb_interrupt(musb); |
| 143 | eoi: |
| 144 | /* EOI needs to be written for the IRQ to be re-asserted. */ |
| 145 | if (ret == IRQ_HANDLED || status) |
| 146 | musb_writel(reg_base, DA8XX_USB_END_OF_INTR_REG, 0); |
| 147 | |
| 148 | spin_unlock_irqrestore(&musb->lock, flags); |
| 149 | |
| 150 | return ret; |
| 151 | } |
| 152 | |
| 153 | static int da8xx_musb_init(struct musb *musb) |
| 154 | { |
| 155 | u32 revision; |
| 156 | void __iomem *reg_base = musb->ctrl_base; |
| 157 | |
| 158 | int ret; |
| 159 | |
| 160 | /* reset the controller */ |
| 161 | writel(0x1, &da8xx_usb_regs->control); |
| 162 | udelay(50); |
| 163 | |
| 164 | /* Returns zero if e.g. not clocked */ |
| 165 | revision = readl(&da8xx_usb_regs->revision); |
| 166 | if (revision == 0) |
| 167 | return -ENODEV; |
| 168 | |
| 169 | /* Disable all interrupts */ |
| 170 | writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK | |
| 171 | DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_set); |
| 172 | |
| 173 | musb->mregs += DA8XX_MENTOR_CORE_OFFSET; |
| 174 | |
| 175 | /* NOTE: IRQs are in mixed mode, not bypass to pure MUSB */ |
| 176 | debug("DA8xx OTG revision %08x, control %02x\n", revision, |
| 177 | musb_readb(reg_base, DA8XX_USB_CTRL_REG)); |
| 178 | |
| 179 | musb->isr = da8xx_musb_interrupt; |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | static int da8xx_musb_exit(struct musb *musb) |
| 184 | { |
| 185 | /* flush any interrupts */ |
| 186 | writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK | |
| 187 | DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_clr); |
| 188 | writel(0, &da8xx_usb_regs->eoi); |
| 189 | |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * da8xx_musb_enable - enable interrupts |
| 195 | */ |
| 196 | static int da8xx_musb_enable(struct musb *musb) |
| 197 | { |
| 198 | void __iomem *reg_base = musb->ctrl_base; |
| 199 | u32 mask; |
| 200 | |
| 201 | /* Workaround: setup IRQs through both register sets. */ |
| 202 | mask = ((musb->epmask & DA8XX_USB_TX_EP_MASK) << DA8XX_INTR_TX_SHIFT) | |
| 203 | ((musb->epmask & DA8XX_USB_RX_EP_MASK) << DA8XX_INTR_RX_SHIFT) | |
| 204 | DA8XX_INTR_USB_MASK; |
| 205 | musb_writel(reg_base, DA8XX_USB_INTR_MASK_SET_REG, mask); |
| 206 | |
| 207 | /* Force the DRVVBUS IRQ so we can start polling for ID change. */ |
| 208 | musb_writel(reg_base, DA8XX_USB_INTR_SRC_SET_REG, |
| 209 | DA8XX_INTR_DRVVBUS << DA8XX_INTR_USB_SHIFT); |
| 210 | |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * da8xx_musb_disable - disable HDRC and flush interrupts |
| 216 | */ |
| 217 | static void da8xx_musb_disable(struct musb *musb) |
| 218 | { |
| 219 | void __iomem *reg_base = musb->ctrl_base; |
| 220 | |
| 221 | musb_writel(reg_base, DA8XX_USB_INTR_MASK_CLEAR_REG, |
| 222 | DA8XX_INTR_USB_MASK | |
| 223 | DA8XX_INTR_TX_MASK | DA8XX_INTR_RX_MASK); |
| 224 | musb_writel(reg_base, DA8XX_USB_END_OF_INTR_REG, 0); |
| 225 | } |
| 226 | |
| 227 | void da8xx_musb_reset(struct udevice *dev) |
| 228 | { |
| 229 | void *reg_base = dev_read_addr_ptr(dev); |
| 230 | |
| 231 | /* Reset the controller */ |
| 232 | musb_writel(reg_base, DA8XX_USB_CTRL_REG, DA8XX_SOFT_RESET_MASK); |
| 233 | } |
| 234 | |
| 235 | void da8xx_musb_clear_irq(struct udevice *dev) |
| 236 | { |
| 237 | /* flush any interrupts */ |
| 238 | writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK | |
| 239 | DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_clr); |
| 240 | writel(0, &da8xx_usb_regs->eoi); |
| 241 | } |
| 242 | |
| 243 | const struct musb_platform_ops da8xx_ops = { |
| 244 | .init = da8xx_musb_init, |
| 245 | .exit = da8xx_musb_exit, |
| 246 | .enable = da8xx_musb_enable, |
| 247 | .disable = da8xx_musb_disable, |
| 248 | }; |
| 249 | |
Simon Glass | b75b15b | 2020-12-03 16:55:23 -0700 | [diff] [blame] | 250 | struct da8xx_musb_plat { |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 251 | void *base; |
| 252 | void *ctrl_mod_base; |
| 253 | struct musb_hdrc_platform_data plat; |
| 254 | struct musb_hdrc_config musb_config; |
| 255 | struct omap_musb_board_data otg_board_data; |
| 256 | struct phy phy; |
| 257 | }; |
| 258 | |
Simon Glass | aad29ae | 2020-12-03 16:55:21 -0700 | [diff] [blame] | 259 | static int da8xx_musb_of_to_plat(struct udevice *dev) |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 260 | { |
Simon Glass | b75b15b | 2020-12-03 16:55:23 -0700 | [diff] [blame] | 261 | struct da8xx_musb_plat *plat = dev_get_plat(dev); |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 262 | const void *fdt = gd->fdt_blob; |
| 263 | int node = dev_of_offset(dev); |
| 264 | |
Simon Glass | 71fa5b4 | 2020-12-03 16:55:18 -0700 | [diff] [blame] | 265 | plat->base = (void *)dev_read_addr_ptr(dev); |
| 266 | plat->musb_config.multipoint = 1; |
| 267 | plat->musb_config.dyn_fifo = 1; |
| 268 | plat->musb_config.num_eps = 5; |
| 269 | plat->musb_config.ram_bits = 10; |
| 270 | plat->plat.power = fdtdec_get_int(fdt, node, "power", 50); |
| 271 | plat->otg_board_data.interface_type = MUSB_INTERFACE_UTMI; |
| 272 | plat->plat.mode = MUSB_HOST; |
| 273 | plat->otg_board_data.dev = dev; |
| 274 | plat->plat.config = &plat->musb_config; |
| 275 | plat->plat.platform_ops = &da8xx_ops; |
| 276 | plat->plat.board_data = &plat->otg_board_data; |
| 277 | plat->otg_board_data.clear_irq = da8xx_musb_clear_irq; |
| 278 | plat->otg_board_data.reset = da8xx_musb_reset; |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 279 | return 0; |
| 280 | } |
| 281 | |
| 282 | static int da8xx_musb_probe(struct udevice *dev) |
| 283 | { |
| 284 | struct musb_host_data *host = dev_get_priv(dev); |
Simon Glass | b75b15b | 2020-12-03 16:55:23 -0700 | [diff] [blame] | 285 | struct da8xx_musb_plat *plat = dev_get_plat(dev); |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 286 | struct usb_bus_priv *priv = dev_get_uclass_priv(dev); |
| 287 | struct omap_musb_board_data *otg_board_data; |
| 288 | int ret; |
| 289 | void *base = dev_read_addr_ptr(dev); |
| 290 | |
| 291 | /* Get the phy info from the device tree */ |
Simon Glass | 71fa5b4 | 2020-12-03 16:55:18 -0700 | [diff] [blame] | 292 | ret = generic_phy_get_by_name(dev, "usb-phy", &plat->phy); |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 293 | if (ret) |
| 294 | return ret; |
| 295 | |
| 296 | /* Initialize the phy */ |
Simon Glass | 71fa5b4 | 2020-12-03 16:55:18 -0700 | [diff] [blame] | 297 | ret = generic_phy_init(&plat->phy); |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 298 | if (ret) |
| 299 | return ret; |
| 300 | |
| 301 | /* enable psc for usb2.0 */ |
| 302 | lpsc_on(33); |
| 303 | |
| 304 | /* Enable phy */ |
Simon Glass | 71fa5b4 | 2020-12-03 16:55:18 -0700 | [diff] [blame] | 305 | generic_phy_power_on(&plat->phy); |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 306 | |
| 307 | priv->desc_before_addr = true; |
Simon Glass | 71fa5b4 | 2020-12-03 16:55:18 -0700 | [diff] [blame] | 308 | otg_board_data = &plat->otg_board_data; |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 309 | |
Simon Glass | 71fa5b4 | 2020-12-03 16:55:18 -0700 | [diff] [blame] | 310 | host->host = musb_init_controller(&plat->plat, |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 311 | (struct device *)otg_board_data, |
Simon Glass | 71fa5b4 | 2020-12-03 16:55:18 -0700 | [diff] [blame] | 312 | plat->base); |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 313 | if (!host->host) { |
| 314 | ret = -ENODEV; |
| 315 | goto shutdown; /* Shutdown what we started */ |
| 316 | } |
| 317 | |
| 318 | ret = musb_lowlevel_init(host); |
| 319 | |
| 320 | if (ret == 0) |
| 321 | return 0; |
| 322 | shutdown: |
| 323 | /* Turn off the phy if we fail */ |
Simon Glass | 71fa5b4 | 2020-12-03 16:55:18 -0700 | [diff] [blame] | 324 | generic_phy_power_off(&plat->phy); |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 325 | lpsc_disable(33); |
| 326 | return ret; |
| 327 | } |
| 328 | |
| 329 | static int da8xx_musb_remove(struct udevice *dev) |
| 330 | { |
| 331 | struct musb_host_data *host = dev_get_priv(dev); |
| 332 | |
| 333 | musb_stop(host->host); |
| 334 | |
| 335 | return 0; |
| 336 | } |
| 337 | |
| 338 | static const struct udevice_id da8xx_musb_ids[] = { |
| 339 | { .compatible = "ti,da830-musb" }, |
| 340 | { } |
| 341 | }; |
| 342 | |
| 343 | U_BOOT_DRIVER(da8xx_musb) = { |
| 344 | .name = "da8xx-musb", |
| 345 | .id = UCLASS_USB, |
| 346 | .of_match = da8xx_musb_ids, |
Simon Glass | aad29ae | 2020-12-03 16:55:21 -0700 | [diff] [blame] | 347 | .of_to_plat = da8xx_musb_of_to_plat, |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 348 | .probe = da8xx_musb_probe, |
| 349 | .remove = da8xx_musb_remove, |
| 350 | .ops = &musb_usb_ops, |
Simon Glass | b75b15b | 2020-12-03 16:55:23 -0700 | [diff] [blame] | 351 | .plat_auto = sizeof(struct da8xx_musb_plat), |
Simon Glass | 8a2b47f | 2020-12-03 16:55:17 -0700 | [diff] [blame] | 352 | .priv_auto = sizeof(struct musb_host_data), |
Adam Ford | b894d87 | 2019-07-10 13:59:10 -0500 | [diff] [blame] | 353 | }; |