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