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/usb_phy_generic.h> 16 17 #include "musb_core.h" 18 19 struct jz4740_glue { 20 struct device *dev; 21 struct platform_device *musb; 22 struct clk *clk; 23 }; 24 25 static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci) 26 { 27 unsigned long flags; 28 irqreturn_t retval = IRQ_NONE; 29 struct musb *musb = __hci; 30 31 spin_lock_irqsave(&musb->lock, flags); 32 33 musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); 34 musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); 35 musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); 36 37 /* 38 * The controller is gadget only, the state of the host mode IRQ bits is 39 * undefined. Mask them to make sure that the musb driver core will 40 * never see them set 41 */ 42 musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME | 43 MUSB_INTR_RESET | MUSB_INTR_SOF; 44 45 if (musb->int_usb || musb->int_tx || musb->int_rx) 46 retval = musb_interrupt(musb); 47 48 spin_unlock_irqrestore(&musb->lock, flags); 49 50 return retval; 51 } 52 53 static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = { 54 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, 55 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, 56 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, }, 57 }; 58 59 static const struct musb_hdrc_config jz4740_musb_config = { 60 /* Silicon does not implement USB OTG. */ 61 .multipoint = 0, 62 /* Max EPs scanned, driver will decide which EP can be used. */ 63 .num_eps = 4, 64 /* RAMbits needed to configure EPs from table */ 65 .ram_bits = 9, 66 .fifo_cfg = jz4740_musb_fifo_cfg, 67 .fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg), 68 }; 69 70 static struct musb_hdrc_platform_data jz4740_musb_platform_data = { 71 .mode = MUSB_PERIPHERAL, 72 .config = &jz4740_musb_config, 73 }; 74 75 static int jz4740_musb_init(struct musb *musb) 76 { 77 struct device *dev = musb->controller->parent; 78 79 if (dev->of_node) 80 musb->xceiv = devm_usb_get_phy_by_phandle(dev, "phys", 0); 81 else 82 musb->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); 83 if (IS_ERR(musb->xceiv)) { 84 dev_err(dev, "No transceiver configured\n"); 85 return PTR_ERR(musb->xceiv); 86 } 87 88 /* Silicon does not implement ConfigData register. 89 * Set dyn_fifo to avoid reading EP config from hardware. 90 */ 91 musb->dyn_fifo = true; 92 93 musb->isr = jz4740_musb_interrupt; 94 95 return 0; 96 } 97 98 /* 99 * DMA has not been confirmed to work with CONFIG_USB_INVENTRA_DMA, 100 * so let's not set up the dma function pointers yet. 101 */ 102 static const struct musb_platform_ops jz4740_musb_ops = { 103 .quirks = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP, 104 .fifo_mode = 2, 105 .init = jz4740_musb_init, 106 }; 107 108 static int jz4740_probe(struct platform_device *pdev) 109 { 110 struct musb_hdrc_platform_data *pdata = &jz4740_musb_platform_data; 111 struct platform_device *musb; 112 struct jz4740_glue *glue; 113 struct clk *clk; 114 int ret; 115 116 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); 117 if (!glue) 118 return -ENOMEM; 119 120 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); 121 if (!musb) { 122 dev_err(&pdev->dev, "failed to allocate musb device\n"); 123 return -ENOMEM; 124 } 125 126 clk = devm_clk_get(&pdev->dev, "udc"); 127 if (IS_ERR(clk)) { 128 dev_err(&pdev->dev, "failed to get clock\n"); 129 ret = PTR_ERR(clk); 130 goto err_platform_device_put; 131 } 132 133 ret = clk_prepare_enable(clk); 134 if (ret) { 135 dev_err(&pdev->dev, "failed to enable clock\n"); 136 goto err_platform_device_put; 137 } 138 139 musb->dev.parent = &pdev->dev; 140 141 glue->dev = &pdev->dev; 142 glue->musb = musb; 143 glue->clk = clk; 144 145 pdata->platform_ops = &jz4740_musb_ops; 146 147 platform_set_drvdata(pdev, glue); 148 149 ret = platform_device_add_resources(musb, pdev->resource, 150 pdev->num_resources); 151 if (ret) { 152 dev_err(&pdev->dev, "failed to add resources\n"); 153 goto err_clk_disable; 154 } 155 156 ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); 157 if (ret) { 158 dev_err(&pdev->dev, "failed to add platform_data\n"); 159 goto err_clk_disable; 160 } 161 162 ret = platform_device_add(musb); 163 if (ret) { 164 dev_err(&pdev->dev, "failed to register musb device\n"); 165 goto err_clk_disable; 166 } 167 168 return 0; 169 170 err_clk_disable: 171 clk_disable_unprepare(clk); 172 err_platform_device_put: 173 platform_device_put(musb); 174 return ret; 175 } 176 177 static int jz4740_remove(struct platform_device *pdev) 178 { 179 struct jz4740_glue *glue = platform_get_drvdata(pdev); 180 181 platform_device_unregister(glue->musb); 182 clk_disable_unprepare(glue->clk); 183 184 return 0; 185 } 186 187 #ifdef CONFIG_OF 188 static const struct of_device_id jz4740_musb_of_match[] = { 189 { .compatible = "ingenic,jz4740-musb" }, 190 {}, 191 }; 192 MODULE_DEVICE_TABLE(of, jz4740_musb_of_match); 193 #endif 194 195 static struct platform_driver jz4740_driver = { 196 .probe = jz4740_probe, 197 .remove = jz4740_remove, 198 .driver = { 199 .name = "musb-jz4740", 200 .of_match_table = of_match_ptr(jz4740_musb_of_match), 201 }, 202 }; 203 204 MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer"); 205 MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>"); 206 MODULE_LICENSE("GPL v2"); 207 module_platform_driver(jz4740_driver); 208