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