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 int err; 109 110 glue->musb = musb; 111 112 if (dev->of_node) 113 musb->xceiv = devm_usb_get_phy_by_phandle(dev, "phys", 0); 114 else 115 musb->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); 116 if (IS_ERR(musb->xceiv)) { 117 err = PTR_ERR(musb->xceiv); 118 if (err != -EPROBE_DEFER) 119 dev_err(dev, "No transceiver configured: %d\n", err); 120 return err; 121 } 122 123 glue->role_sw = usb_role_switch_register(dev, &role_sw_desc); 124 if (IS_ERR(glue->role_sw)) { 125 dev_err(dev, "Failed to register USB role switch\n"); 126 return PTR_ERR(glue->role_sw); 127 } 128 129 /* 130 * Silicon does not implement ConfigData register. 131 * Set dyn_fifo to avoid reading EP config from hardware. 132 */ 133 musb->dyn_fifo = true; 134 135 musb->isr = jz4740_musb_interrupt; 136 137 return 0; 138 } 139 140 static int jz4740_musb_exit(struct musb *musb) 141 { 142 struct jz4740_glue *glue = dev_get_drvdata(musb->controller->parent); 143 144 usb_role_switch_unregister(glue->role_sw); 145 146 return 0; 147 } 148 149 static const struct musb_platform_ops jz4740_musb_ops = { 150 .quirks = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP, 151 .fifo_mode = 2, 152 .init = jz4740_musb_init, 153 .exit = jz4740_musb_exit, 154 #ifdef CONFIG_USB_INVENTRA_DMA 155 .dma_init = musbhs_dma_controller_create_noirq, 156 .dma_exit = musbhs_dma_controller_destroy, 157 #endif 158 }; 159 160 static const struct musb_hdrc_platform_data jz4740_musb_pdata = { 161 .mode = MUSB_PERIPHERAL, 162 .config = &jz4740_musb_config, 163 .platform_ops = &jz4740_musb_ops, 164 }; 165 166 static struct musb_fifo_cfg jz4770_musb_fifo_cfg[] = { 167 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, 168 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, 169 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, 170 { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, 171 { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, }, 172 { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, }, 173 { .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, }, 174 { .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, }, 175 { .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, }, 176 { .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, }, 177 }; 178 179 static struct musb_hdrc_config jz4770_musb_config = { 180 .multipoint = 1, 181 .num_eps = 11, 182 .ram_bits = 11, 183 .fifo_cfg = jz4770_musb_fifo_cfg, 184 .fifo_cfg_size = ARRAY_SIZE(jz4770_musb_fifo_cfg), 185 }; 186 187 static const struct musb_hdrc_platform_data jz4770_musb_pdata = { 188 .mode = MUSB_PERIPHERAL, /* TODO: support OTG */ 189 .config = &jz4770_musb_config, 190 .platform_ops = &jz4740_musb_ops, 191 }; 192 193 static int jz4740_probe(struct platform_device *pdev) 194 { 195 struct device *dev = &pdev->dev; 196 const struct musb_hdrc_platform_data *pdata; 197 struct platform_device *musb; 198 struct jz4740_glue *glue; 199 struct clk *clk; 200 int ret; 201 202 glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL); 203 if (!glue) 204 return -ENOMEM; 205 206 pdata = of_device_get_match_data(dev); 207 if (!pdata) { 208 dev_err(dev, "missing platform data\n"); 209 return -EINVAL; 210 } 211 212 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); 213 if (!musb) { 214 dev_err(dev, "failed to allocate musb device\n"); 215 return -ENOMEM; 216 } 217 218 clk = devm_clk_get(dev, "udc"); 219 if (IS_ERR(clk)) { 220 dev_err(dev, "failed to get clock\n"); 221 ret = PTR_ERR(clk); 222 goto err_platform_device_put; 223 } 224 225 ret = clk_prepare_enable(clk); 226 if (ret) { 227 dev_err(dev, "failed to enable clock\n"); 228 goto err_platform_device_put; 229 } 230 231 musb->dev.parent = dev; 232 musb->dev.dma_mask = &musb->dev.coherent_dma_mask; 233 musb->dev.coherent_dma_mask = DMA_BIT_MASK(32); 234 235 glue->pdev = musb; 236 glue->clk = clk; 237 238 platform_set_drvdata(pdev, glue); 239 240 ret = platform_device_add_resources(musb, pdev->resource, 241 pdev->num_resources); 242 if (ret) { 243 dev_err(dev, "failed to add resources\n"); 244 goto err_clk_disable; 245 } 246 247 ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); 248 if (ret) { 249 dev_err(dev, "failed to add platform_data\n"); 250 goto err_clk_disable; 251 } 252 253 ret = platform_device_add(musb); 254 if (ret) { 255 dev_err(dev, "failed to register musb device\n"); 256 goto err_clk_disable; 257 } 258 259 return 0; 260 261 err_clk_disable: 262 clk_disable_unprepare(clk); 263 err_platform_device_put: 264 platform_device_put(musb); 265 return ret; 266 } 267 268 static int jz4740_remove(struct platform_device *pdev) 269 { 270 struct jz4740_glue *glue = platform_get_drvdata(pdev); 271 272 platform_device_unregister(glue->pdev); 273 clk_disable_unprepare(glue->clk); 274 275 return 0; 276 } 277 278 static const struct of_device_id jz4740_musb_of_match[] = { 279 { .compatible = "ingenic,jz4740-musb", .data = &jz4740_musb_pdata }, 280 { .compatible = "ingenic,jz4770-musb", .data = &jz4770_musb_pdata }, 281 { /* sentinel */ }, 282 }; 283 MODULE_DEVICE_TABLE(of, jz4740_musb_of_match); 284 285 static struct platform_driver jz4740_driver = { 286 .probe = jz4740_probe, 287 .remove = jz4740_remove, 288 .driver = { 289 .name = "musb-jz4740", 290 .of_match_table = jz4740_musb_of_match, 291 }, 292 }; 293 294 MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer"); 295 MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>"); 296 MODULE_LICENSE("GPL v2"); 297 module_platform_driver(jz4740_driver); 298