Apelete Seketeli | 10434d2 | 2013-12-19 21:42:26 +0100 | [diff] [blame] | 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> |
Apelete Seketeli | 3d75bd3 | 2014-07-06 19:58:03 +0200 | [diff] [blame] | 22 | #include <linux/usb/usb_phy_generic.h> |
Apelete Seketeli | 10434d2 | 2013-12-19 21:42:26 +0100 | [diff] [blame] | 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 | { |
Apelete Seketeli | 3d75bd3 | 2014-07-06 19:58:03 +0200 | [diff] [blame] | 84 | usb_phy_generic_register(); |
Apelete Seketeli | 10434d2 | 2013-12-19 21:42:26 +0100 | [diff] [blame] | 85 | musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2); |
Vladimir Zapolskiy | 97b9b7d | 2016-04-25 15:53:31 -0500 | [diff] [blame] | 86 | if (IS_ERR(musb->xceiv)) { |
Apelete Seketeli | 10434d2 | 2013-12-19 21:42:26 +0100 | [diff] [blame] | 87 | pr_err("HS UDC: no transceiver configured\n"); |
Vladimir Zapolskiy | 97b9b7d | 2016-04-25 15:53:31 -0500 | [diff] [blame] | 88 | return PTR_ERR(musb->xceiv); |
Apelete Seketeli | 10434d2 | 2013-12-19 21:42:26 +0100 | [diff] [blame] | 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 | |
Tony Lindgren | 7f6283e | 2015-05-01 12:29:28 -0700 | [diff] [blame] | 108 | /* |
| 109 | * DMA has not been confirmed to work with CONFIG_USB_INVENTRA_DMA, |
| 110 | * so let's not set up the dma function pointers yet. |
| 111 | */ |
Apelete Seketeli | 10434d2 | 2013-12-19 21:42:26 +0100 | [diff] [blame] | 112 | static const struct musb_platform_ops jz4740_musb_ops = { |
Tony Lindgren | f8e9f34f | 2015-05-01 12:29:27 -0700 | [diff] [blame] | 113 | .quirks = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP, |
Tony Lindgren | 8a77f05 | 2014-11-24 11:05:04 -0800 | [diff] [blame] | 114 | .fifo_mode = 2, |
Apelete Seketeli | 10434d2 | 2013-12-19 21:42:26 +0100 | [diff] [blame] | 115 | .init = jz4740_musb_init, |
| 116 | .exit = jz4740_musb_exit, |
| 117 | }; |
| 118 | |
| 119 | static int jz4740_probe(struct platform_device *pdev) |
| 120 | { |
| 121 | struct musb_hdrc_platform_data *pdata = &jz4740_musb_platform_data; |
| 122 | struct platform_device *musb; |
| 123 | struct jz4740_glue *glue; |
| 124 | struct clk *clk; |
| 125 | int ret; |
| 126 | |
| 127 | glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); |
| 128 | if (!glue) |
| 129 | return -ENOMEM; |
| 130 | |
| 131 | musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); |
| 132 | if (!musb) { |
| 133 | dev_err(&pdev->dev, "failed to allocate musb device\n"); |
| 134 | return -ENOMEM; |
| 135 | } |
| 136 | |
| 137 | clk = devm_clk_get(&pdev->dev, "udc"); |
| 138 | if (IS_ERR(clk)) { |
| 139 | dev_err(&pdev->dev, "failed to get clock\n"); |
| 140 | ret = PTR_ERR(clk); |
| 141 | goto err_platform_device_put; |
| 142 | } |
| 143 | |
| 144 | ret = clk_prepare_enable(clk); |
| 145 | if (ret) { |
| 146 | dev_err(&pdev->dev, "failed to enable clock\n"); |
| 147 | goto err_platform_device_put; |
| 148 | } |
| 149 | |
| 150 | musb->dev.parent = &pdev->dev; |
| 151 | |
| 152 | glue->dev = &pdev->dev; |
| 153 | glue->musb = musb; |
| 154 | glue->clk = clk; |
| 155 | |
| 156 | pdata->platform_ops = &jz4740_musb_ops; |
| 157 | |
| 158 | platform_set_drvdata(pdev, glue); |
| 159 | |
| 160 | ret = platform_device_add_resources(musb, pdev->resource, |
| 161 | pdev->num_resources); |
| 162 | if (ret) { |
| 163 | dev_err(&pdev->dev, "failed to add resources\n"); |
| 164 | goto err_clk_disable; |
| 165 | } |
| 166 | |
| 167 | ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); |
| 168 | if (ret) { |
| 169 | dev_err(&pdev->dev, "failed to add platform_data\n"); |
| 170 | goto err_clk_disable; |
| 171 | } |
| 172 | |
| 173 | ret = platform_device_add(musb); |
| 174 | if (ret) { |
| 175 | dev_err(&pdev->dev, "failed to register musb device\n"); |
| 176 | goto err_clk_disable; |
| 177 | } |
| 178 | |
| 179 | return 0; |
| 180 | |
| 181 | err_clk_disable: |
| 182 | clk_disable_unprepare(clk); |
| 183 | err_platform_device_put: |
| 184 | platform_device_put(musb); |
| 185 | return ret; |
| 186 | } |
| 187 | |
| 188 | static int jz4740_remove(struct platform_device *pdev) |
| 189 | { |
| 190 | struct jz4740_glue *glue = platform_get_drvdata(pdev); |
| 191 | |
| 192 | platform_device_unregister(glue->musb); |
Apelete Seketeli | 3d75bd3 | 2014-07-06 19:58:03 +0200 | [diff] [blame] | 193 | usb_phy_generic_unregister(pdev); |
Apelete Seketeli | 10434d2 | 2013-12-19 21:42:26 +0100 | [diff] [blame] | 194 | clk_disable_unprepare(glue->clk); |
| 195 | |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | static struct platform_driver jz4740_driver = { |
| 200 | .probe = jz4740_probe, |
| 201 | .remove = jz4740_remove, |
| 202 | .driver = { |
| 203 | .name = "musb-jz4740", |
| 204 | }, |
| 205 | }; |
| 206 | |
| 207 | MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer"); |
| 208 | MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>"); |
| 209 | MODULE_LICENSE("GPL v2"); |
| 210 | module_platform_driver(jz4740_driver); |