1 /* 2 * Ingenic JZ4740 "glue layer" 3 * 4 * Copyright (C) 2013, Apelete Seketeli <apelete@seketeli.net> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * You should have received a copy of the GNU General Public License along 12 * with this program; if not, write to the Free Software Foundation, Inc., 13 * 675 Mass Ave, Cambridge, MA 02139, USA. 14 */ 15 16 #include <linux/clk.h> 17 #include <linux/dma-mapping.h> 18 #include <linux/errno.h> 19 #include <linux/kernel.h> 20 #include <linux/module.h> 21 #include <linux/platform_device.h> 22 #include <linux/usb/usb_phy_generic.h> 23 24 #include "musb_core.h" 25 26 struct jz4740_glue { 27 struct device *dev; 28 struct platform_device *musb; 29 struct clk *clk; 30 }; 31 32 static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci) 33 { 34 unsigned long flags; 35 irqreturn_t retval = IRQ_NONE; 36 struct musb *musb = __hci; 37 38 spin_lock_irqsave(&musb->lock, flags); 39 40 musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); 41 musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); 42 musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); 43 44 /* 45 * The controller is gadget only, the state of the host mode IRQ bits is 46 * undefined. Mask them to make sure that the musb driver core will 47 * never see them set 48 */ 49 musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME | 50 MUSB_INTR_RESET | MUSB_INTR_SOF; 51 52 if (musb->int_usb || musb->int_tx || musb->int_rx) 53 retval = musb_interrupt(musb); 54 55 spin_unlock_irqrestore(&musb->lock, flags); 56 57 return retval; 58 } 59 60 static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = { 61 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, 62 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, 63 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, }, 64 }; 65 66 static struct musb_hdrc_config jz4740_musb_config = { 67 /* Silicon does not implement USB OTG. */ 68 .multipoint = 0, 69 /* Max EPs scanned, driver will decide which EP can be used. */ 70 .num_eps = 4, 71 /* RAMbits needed to configure EPs from table */ 72 .ram_bits = 9, 73 .fifo_cfg = jz4740_musb_fifo_cfg, 74 .fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg), 75 }; 76 77 static struct musb_hdrc_platform_data jz4740_musb_platform_data = { 78 .mode = MUSB_PERIPHERAL, 79 .config = &jz4740_musb_config, 80 }; 81 82 static int jz4740_musb_init(struct musb *musb) 83 { 84 usb_phy_generic_register(); 85 musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2); 86 if (!musb->xceiv) { 87 pr_err("HS UDC: no transceiver configured\n"); 88 return -ENODEV; 89 } 90 91 /* Silicon does not implement ConfigData register. 92 * Set dyn_fifo to avoid reading EP config from hardware. 93 */ 94 musb->dyn_fifo = true; 95 96 musb->isr = jz4740_musb_interrupt; 97 98 return 0; 99 } 100 101 static int jz4740_musb_exit(struct musb *musb) 102 { 103 usb_put_phy(musb->xceiv); 104 105 return 0; 106 } 107 108 static const struct musb_platform_ops jz4740_musb_ops = { 109 .quirks = MUSB_INDEXED_EP, 110 .fifo_mode = 2, 111 .init = jz4740_musb_init, 112 .exit = jz4740_musb_exit, 113 }; 114 115 static int jz4740_probe(struct platform_device *pdev) 116 { 117 struct musb_hdrc_platform_data *pdata = &jz4740_musb_platform_data; 118 struct platform_device *musb; 119 struct jz4740_glue *glue; 120 struct clk *clk; 121 int ret; 122 123 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); 124 if (!glue) 125 return -ENOMEM; 126 127 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); 128 if (!musb) { 129 dev_err(&pdev->dev, "failed to allocate musb device\n"); 130 return -ENOMEM; 131 } 132 133 clk = devm_clk_get(&pdev->dev, "udc"); 134 if (IS_ERR(clk)) { 135 dev_err(&pdev->dev, "failed to get clock\n"); 136 ret = PTR_ERR(clk); 137 goto err_platform_device_put; 138 } 139 140 ret = clk_prepare_enable(clk); 141 if (ret) { 142 dev_err(&pdev->dev, "failed to enable clock\n"); 143 goto err_platform_device_put; 144 } 145 146 musb->dev.parent = &pdev->dev; 147 148 glue->dev = &pdev->dev; 149 glue->musb = musb; 150 glue->clk = clk; 151 152 pdata->platform_ops = &jz4740_musb_ops; 153 154 platform_set_drvdata(pdev, glue); 155 156 ret = platform_device_add_resources(musb, pdev->resource, 157 pdev->num_resources); 158 if (ret) { 159 dev_err(&pdev->dev, "failed to add resources\n"); 160 goto err_clk_disable; 161 } 162 163 ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); 164 if (ret) { 165 dev_err(&pdev->dev, "failed to add platform_data\n"); 166 goto err_clk_disable; 167 } 168 169 ret = platform_device_add(musb); 170 if (ret) { 171 dev_err(&pdev->dev, "failed to register musb device\n"); 172 goto err_clk_disable; 173 } 174 175 return 0; 176 177 err_clk_disable: 178 clk_disable_unprepare(clk); 179 err_platform_device_put: 180 platform_device_put(musb); 181 return ret; 182 } 183 184 static int jz4740_remove(struct platform_device *pdev) 185 { 186 struct jz4740_glue *glue = platform_get_drvdata(pdev); 187 188 platform_device_unregister(glue->musb); 189 usb_phy_generic_unregister(pdev); 190 clk_disable_unprepare(glue->clk); 191 192 return 0; 193 } 194 195 static struct platform_driver jz4740_driver = { 196 .probe = jz4740_probe, 197 .remove = jz4740_remove, 198 .driver = { 199 .name = "musb-jz4740", 200 }, 201 }; 202 203 MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer"); 204 MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>"); 205 MODULE_LICENSE("GPL v2"); 206 module_platform_driver(jz4740_driver); 207