1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Ingenic JZ4740 "glue layer" 4 * 5 * Copyright (C) 2013, Apelete Seketeli <apelete@seketeli.net> 6 */ 7 8 #include <linux/clk.h> 9 #include <linux/dma-mapping.h> 10 #include <linux/errno.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/of_device.h> 14 #include <linux/phy/phy.h> 15 #include <linux/platform_device.h> 16 #include <linux/usb/role.h> 17 #include <linux/usb/usb_phy_generic.h> 18 19 #include "musb_core.h" 20 21 struct jz4740_glue { 22 struct platform_device *pdev; 23 struct musb *musb; 24 struct clk *clk; 25 struct usb_role_switch *role_sw; 26 }; 27 28 static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci) 29 { 30 unsigned long flags; 31 irqreturn_t retval = IRQ_NONE, retval_dma = IRQ_NONE; 32 struct musb *musb = __hci; 33 34 if (IS_ENABLED(CONFIG_USB_INVENTRA_DMA) && musb->dma_controller) 35 retval_dma = dma_controller_irq(irq, musb->dma_controller); 36 37 spin_lock_irqsave(&musb->lock, flags); 38 39 musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); 40 musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); 41 musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); 42 43 /* 44 * The controller is gadget only, the state of the host mode IRQ bits is 45 * undefined. Mask them to make sure that the musb driver core will 46 * never see them set 47 */ 48 musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME | 49 MUSB_INTR_RESET | MUSB_INTR_SOF; 50 51 if (musb->int_usb || musb->int_tx || musb->int_rx) 52 retval = musb_interrupt(musb); 53 54 spin_unlock_irqrestore(&musb->lock, flags); 55 56 if (retval == IRQ_HANDLED || retval_dma == IRQ_HANDLED) 57 return IRQ_HANDLED; 58 59 return IRQ_NONE; 60 } 61 62 static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = { 63 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, 64 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, 65 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, }, 66 }; 67 68 static const struct musb_hdrc_config jz4740_musb_config = { 69 /* Silicon does not implement USB OTG. */ 70 .multipoint = 0, 71 /* Max EPs scanned, driver will decide which EP can be used. */ 72 .num_eps = 4, 73 /* RAMbits needed to configure EPs from table */ 74 .ram_bits = 9, 75 .fifo_cfg = jz4740_musb_fifo_cfg, 76 .fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg), 77 }; 78 79 static int jz4740_musb_role_switch_set(struct usb_role_switch *sw, 80 enum usb_role role) 81 { 82 struct jz4740_glue *glue = usb_role_switch_get_drvdata(sw); 83 struct usb_phy *phy = glue->musb->xceiv; 84 85 if (!phy) 86 return 0; 87 88 switch (role) { 89 case USB_ROLE_NONE: 90 atomic_notifier_call_chain(&phy->notifier, USB_EVENT_NONE, phy); 91 break; 92 case USB_ROLE_DEVICE: 93 atomic_notifier_call_chain(&phy->notifier, USB_EVENT_VBUS, phy); 94 break; 95 case USB_ROLE_HOST: 96 atomic_notifier_call_chain(&phy->notifier, USB_EVENT_ID, phy); 97 break; 98 } 99 100 return 0; 101 } 102 103 static int jz4740_musb_init(struct musb *musb) 104 { 105 struct device *dev = musb->controller->parent; 106 struct jz4740_glue *glue = dev_get_drvdata(dev); 107 struct usb_role_switch_desc role_sw_desc = { 108 .set = jz4740_musb_role_switch_set, 109 .driver_data = glue, 110 .fwnode = dev_fwnode(dev), 111 }; 112 int err; 113 114 glue->musb = musb; 115 116 if (IS_ENABLED(CONFIG_GENERIC_PHY)) { 117 musb->phy = devm_of_phy_get_by_index(dev, dev->of_node, 0); 118 if (IS_ERR(musb->phy)) { 119 err = PTR_ERR(musb->phy); 120 if (err != -ENODEV) { 121 dev_err(dev, "Unable to get PHY\n"); 122 return err; 123 } 124 125 musb->phy = NULL; 126 } 127 } 128 129 if (musb->phy) { 130 err = phy_init(musb->phy); 131 if (err) { 132 dev_err(dev, "Failed to init PHY\n"); 133 return err; 134 } 135 136 err = phy_power_on(musb->phy); 137 if (err) { 138 dev_err(dev, "Unable to power on PHY\n"); 139 goto err_phy_shutdown; 140 } 141 } else { 142 if (dev->of_node) 143 musb->xceiv = devm_usb_get_phy_by_phandle(dev, "phys", 0); 144 else 145 musb->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); 146 if (IS_ERR(musb->xceiv)) { 147 dev_err(dev, "No transceiver configured\n"); 148 return PTR_ERR(musb->xceiv); 149 } 150 } 151 152 glue->role_sw = usb_role_switch_register(dev, &role_sw_desc); 153 if (IS_ERR(glue->role_sw)) { 154 dev_err(dev, "Failed to register USB role switch\n"); 155 err = PTR_ERR(glue->role_sw); 156 goto err_phy_power_down; 157 } 158 159 /* 160 * Silicon does not implement ConfigData register. 161 * Set dyn_fifo to avoid reading EP config from hardware. 162 */ 163 musb->dyn_fifo = true; 164 165 musb->isr = jz4740_musb_interrupt; 166 167 return 0; 168 169 err_phy_power_down: 170 if (musb->phy) 171 phy_power_off(musb->phy); 172 err_phy_shutdown: 173 if (musb->phy) 174 phy_exit(musb->phy); 175 return err; 176 } 177 178 static int jz4740_musb_exit(struct musb *musb) 179 { 180 struct jz4740_glue *glue = dev_get_drvdata(musb->controller->parent); 181 182 usb_role_switch_unregister(glue->role_sw); 183 if (musb->phy) { 184 phy_power_off(musb->phy); 185 phy_exit(musb->phy); 186 } 187 188 return 0; 189 } 190 191 static const struct musb_platform_ops jz4740_musb_ops = { 192 .quirks = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP, 193 .fifo_mode = 2, 194 .init = jz4740_musb_init, 195 .exit = jz4740_musb_exit, 196 #ifdef CONFIG_USB_INVENTRA_DMA 197 .dma_init = musbhs_dma_controller_create_noirq, 198 .dma_exit = musbhs_dma_controller_destroy, 199 #endif 200 }; 201 202 static const struct musb_hdrc_platform_data jz4740_musb_pdata = { 203 .mode = MUSB_PERIPHERAL, 204 .config = &jz4740_musb_config, 205 .platform_ops = &jz4740_musb_ops, 206 }; 207 208 static struct musb_fifo_cfg jz4770_musb_fifo_cfg[] = { 209 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, 210 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, 211 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, 212 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, 213 { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, }, 214 { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, }, 215 { .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, }, 216 { .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, }, 217 { .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, }, 218 { .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, }, 219 }; 220 221 static struct musb_hdrc_config jz4770_musb_config = { 222 .multipoint = 1, 223 .num_eps = 11, 224 .ram_bits = 11, 225 .fifo_cfg = jz4770_musb_fifo_cfg, 226 .fifo_cfg_size = ARRAY_SIZE(jz4770_musb_fifo_cfg), 227 }; 228 229 static const struct musb_hdrc_platform_data jz4770_musb_pdata = { 230 .mode = MUSB_PERIPHERAL, /* TODO: support OTG */ 231 .config = &jz4770_musb_config, 232 .platform_ops = &jz4740_musb_ops, 233 }; 234 235 static int jz4740_probe(struct platform_device *pdev) 236 { 237 struct device *dev = &pdev->dev; 238 const struct musb_hdrc_platform_data *pdata; 239 struct platform_device *musb; 240 struct jz4740_glue *glue; 241 struct clk *clk; 242 int ret; 243 244 glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL); 245 if (!glue) 246 return -ENOMEM; 247 248 pdata = of_device_get_match_data(dev); 249 if (!pdata) { 250 dev_err(dev, "missing platform data\n"); 251 return -EINVAL; 252 } 253 254 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); 255 if (!musb) { 256 dev_err(dev, "failed to allocate musb device\n"); 257 return -ENOMEM; 258 } 259 260 clk = devm_clk_get(dev, "udc"); 261 if (IS_ERR(clk)) { 262 dev_err(dev, "failed to get clock\n"); 263 ret = PTR_ERR(clk); 264 goto err_platform_device_put; 265 } 266 267 ret = clk_prepare_enable(clk); 268 if (ret) { 269 dev_err(dev, "failed to enable clock\n"); 270 goto err_platform_device_put; 271 } 272 273 musb->dev.parent = dev; 274 musb->dev.dma_mask = &musb->dev.coherent_dma_mask; 275 musb->dev.coherent_dma_mask = DMA_BIT_MASK(32); 276 device_set_of_node_from_dev(&musb->dev, dev); 277 278 glue->pdev = musb; 279 glue->clk = clk; 280 281 platform_set_drvdata(pdev, glue); 282 283 ret = platform_device_add_resources(musb, pdev->resource, 284 pdev->num_resources); 285 if (ret) { 286 dev_err(dev, "failed to add resources\n"); 287 goto err_clk_disable; 288 } 289 290 ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); 291 if (ret) { 292 dev_err(dev, "failed to add platform_data\n"); 293 goto err_clk_disable; 294 } 295 296 ret = platform_device_add(musb); 297 if (ret) { 298 dev_err(dev, "failed to register musb device\n"); 299 goto err_clk_disable; 300 } 301 302 return 0; 303 304 err_clk_disable: 305 clk_disable_unprepare(clk); 306 err_platform_device_put: 307 platform_device_put(musb); 308 return ret; 309 } 310 311 static void jz4740_remove(struct platform_device *pdev) 312 { 313 struct jz4740_glue *glue = platform_get_drvdata(pdev); 314 315 platform_device_unregister(glue->pdev); 316 clk_disable_unprepare(glue->clk); 317 } 318 319 static const struct of_device_id jz4740_musb_of_match[] = { 320 { .compatible = "ingenic,jz4740-musb", .data = &jz4740_musb_pdata }, 321 { .compatible = "ingenic,jz4770-musb", .data = &jz4770_musb_pdata }, 322 { /* sentinel */ }, 323 }; 324 MODULE_DEVICE_TABLE(of, jz4740_musb_of_match); 325 326 static struct platform_driver jz4740_driver = { 327 .probe = jz4740_probe, 328 .remove_new = jz4740_remove, 329 .driver = { 330 .name = "musb-jz4740", 331 .of_match_table = jz4740_musb_of_match, 332 }, 333 }; 334 335 MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer"); 336 MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>"); 337 MODULE_LICENSE("GPL v2"); 338 module_platform_driver(jz4740_driver); 339