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 usb_phy_generic_register(); 78 musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2); 79 if (IS_ERR(musb->xceiv)) { 80 pr_err("HS UDC: no transceiver configured\n"); 81 return PTR_ERR(musb->xceiv); 82 } 83 84 /* Silicon does not implement ConfigData register. 85 * Set dyn_fifo to avoid reading EP config from hardware. 86 */ 87 musb->dyn_fifo = true; 88 89 musb->isr = jz4740_musb_interrupt; 90 91 return 0; 92 } 93 94 static int jz4740_musb_exit(struct musb *musb) 95 { 96 usb_put_phy(musb->xceiv); 97 98 return 0; 99 } 100 101 /* 102 * DMA has not been confirmed to work with CONFIG_USB_INVENTRA_DMA, 103 * so let's not set up the dma function pointers yet. 104 */ 105 static const struct musb_platform_ops jz4740_musb_ops = { 106 .quirks = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP, 107 .fifo_mode = 2, 108 .init = jz4740_musb_init, 109 .exit = jz4740_musb_exit, 110 }; 111 112 static int jz4740_probe(struct platform_device *pdev) 113 { 114 struct musb_hdrc_platform_data *pdata = &jz4740_musb_platform_data; 115 struct platform_device *musb; 116 struct jz4740_glue *glue; 117 struct clk *clk; 118 int ret; 119 120 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); 121 if (!glue) 122 return -ENOMEM; 123 124 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); 125 if (!musb) { 126 dev_err(&pdev->dev, "failed to allocate musb device\n"); 127 return -ENOMEM; 128 } 129 130 clk = devm_clk_get(&pdev->dev, "udc"); 131 if (IS_ERR(clk)) { 132 dev_err(&pdev->dev, "failed to get clock\n"); 133 ret = PTR_ERR(clk); 134 goto err_platform_device_put; 135 } 136 137 ret = clk_prepare_enable(clk); 138 if (ret) { 139 dev_err(&pdev->dev, "failed to enable clock\n"); 140 goto err_platform_device_put; 141 } 142 143 musb->dev.parent = &pdev->dev; 144 145 glue->dev = &pdev->dev; 146 glue->musb = musb; 147 glue->clk = clk; 148 149 pdata->platform_ops = &jz4740_musb_ops; 150 151 platform_set_drvdata(pdev, glue); 152 153 ret = platform_device_add_resources(musb, pdev->resource, 154 pdev->num_resources); 155 if (ret) { 156 dev_err(&pdev->dev, "failed to add resources\n"); 157 goto err_clk_disable; 158 } 159 160 ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); 161 if (ret) { 162 dev_err(&pdev->dev, "failed to add platform_data\n"); 163 goto err_clk_disable; 164 } 165 166 ret = platform_device_add(musb); 167 if (ret) { 168 dev_err(&pdev->dev, "failed to register musb device\n"); 169 goto err_clk_disable; 170 } 171 172 return 0; 173 174 err_clk_disable: 175 clk_disable_unprepare(clk); 176 err_platform_device_put: 177 platform_device_put(musb); 178 return ret; 179 } 180 181 static int jz4740_remove(struct platform_device *pdev) 182 { 183 struct jz4740_glue *glue = platform_get_drvdata(pdev); 184 185 platform_device_unregister(glue->musb); 186 usb_phy_generic_unregister(pdev); 187 clk_disable_unprepare(glue->clk); 188 189 return 0; 190 } 191 192 #ifdef CONFIG_OF 193 static const struct of_device_id jz4740_musb_of_match[] = { 194 { .compatible = "ingenic,jz4740-musb" }, 195 {}, 196 }; 197 MODULE_DEVICE_TABLE(of, jz4740_musb_of_match); 198 #endif 199 200 static struct platform_driver jz4740_driver = { 201 .probe = jz4740_probe, 202 .remove = jz4740_remove, 203 .driver = { 204 .name = "musb-jz4740", 205 .of_match_table = of_match_ptr(jz4740_musb_of_match), 206 }, 207 }; 208 209 MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer"); 210 MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>"); 211 MODULE_LICENSE("GPL v2"); 212 module_platform_driver(jz4740_driver); 213