1 /* 2 * drivers/usb/host/ehci-orion.c 3 * 4 * Tzachi Perelstein <tzachi@marvell.com> 5 * 6 * This file is licensed under the terms of the GNU General Public 7 * License version 2. This program is licensed "as is" without any 8 * warranty of any kind, whether express or implied. 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/platform_device.h> 14 #include <linux/mbus.h> 15 #include <linux/clk.h> 16 #include <linux/platform_data/usb-ehci-orion.h> 17 #include <linux/of.h> 18 #include <linux/of_device.h> 19 #include <linux/of_irq.h> 20 #include <linux/usb.h> 21 #include <linux/usb/hcd.h> 22 #include <linux/io.h> 23 #include <linux/dma-mapping.h> 24 25 #include "ehci.h" 26 27 #define rdl(off) __raw_readl(hcd->regs + (off)) 28 #define wrl(off, val) __raw_writel((val), hcd->regs + (off)) 29 30 #define USB_CMD 0x140 31 #define USB_MODE 0x1a8 32 #define USB_CAUSE 0x310 33 #define USB_MASK 0x314 34 #define USB_WINDOW_CTRL(i) (0x320 + ((i) << 4)) 35 #define USB_WINDOW_BASE(i) (0x324 + ((i) << 4)) 36 #define USB_IPG 0x360 37 #define USB_PHY_PWR_CTRL 0x400 38 #define USB_PHY_TX_CTRL 0x420 39 #define USB_PHY_RX_CTRL 0x430 40 #define USB_PHY_IVREF_CTRL 0x440 41 #define USB_PHY_TST_GRP_CTRL 0x450 42 43 #define DRIVER_DESC "EHCI orion driver" 44 45 static const char hcd_name[] = "ehci-orion"; 46 47 static struct hc_driver __read_mostly ehci_orion_hc_driver; 48 49 /* 50 * Implement Orion USB controller specification guidelines 51 */ 52 static void orion_usb_phy_v1_setup(struct usb_hcd *hcd) 53 { 54 /* The below GLs are according to the Orion Errata document */ 55 /* 56 * Clear interrupt cause and mask 57 */ 58 wrl(USB_CAUSE, 0); 59 wrl(USB_MASK, 0); 60 61 /* 62 * Reset controller 63 */ 64 wrl(USB_CMD, rdl(USB_CMD) | 0x2); 65 while (rdl(USB_CMD) & 0x2); 66 67 /* 68 * GL# USB-10: Set IPG for non start of frame packets 69 * Bits[14:8]=0xc 70 */ 71 wrl(USB_IPG, (rdl(USB_IPG) & ~0x7f00) | 0xc00); 72 73 /* 74 * GL# USB-9: USB 2.0 Power Control 75 * BG_VSEL[7:6]=0x1 76 */ 77 wrl(USB_PHY_PWR_CTRL, (rdl(USB_PHY_PWR_CTRL) & ~0xc0)| 0x40); 78 79 /* 80 * GL# USB-1: USB PHY Tx Control - force calibration to '8' 81 * TXDATA_BLOCK_EN[21]=0x1, EXT_RCAL_EN[13]=0x1, IMP_CAL[6:3]=0x8 82 */ 83 wrl(USB_PHY_TX_CTRL, (rdl(USB_PHY_TX_CTRL) & ~0x78) | 0x202040); 84 85 /* 86 * GL# USB-3 GL# USB-9: USB PHY Rx Control 87 * RXDATA_BLOCK_LENGHT[31:30]=0x3, EDGE_DET_SEL[27:26]=0, 88 * CDR_FASTLOCK_EN[21]=0, DISCON_THRESHOLD[9:8]=0, SQ_THRESH[7:4]=0x1 89 */ 90 wrl(USB_PHY_RX_CTRL, (rdl(USB_PHY_RX_CTRL) & ~0xc2003f0) | 0xc0000010); 91 92 /* 93 * GL# USB-3 GL# USB-9: USB PHY IVREF Control 94 * PLLVDD12[1:0]=0x2, RXVDD[5:4]=0x3, Reserved[19]=0 95 */ 96 wrl(USB_PHY_IVREF_CTRL, (rdl(USB_PHY_IVREF_CTRL) & ~0x80003 ) | 0x32); 97 98 /* 99 * GL# USB-3 GL# USB-9: USB PHY Test Group Control 100 * REG_FIFO_SQ_RST[15]=0 101 */ 102 wrl(USB_PHY_TST_GRP_CTRL, rdl(USB_PHY_TST_GRP_CTRL) & ~0x8000); 103 104 /* 105 * Stop and reset controller 106 */ 107 wrl(USB_CMD, rdl(USB_CMD) & ~0x1); 108 wrl(USB_CMD, rdl(USB_CMD) | 0x2); 109 while (rdl(USB_CMD) & 0x2); 110 111 /* 112 * GL# USB-5 Streaming disable REG_USB_MODE[4]=1 113 * TBD: This need to be done after each reset! 114 * GL# USB-4 Setup USB Host mode 115 */ 116 wrl(USB_MODE, 0x13); 117 } 118 119 static void 120 ehci_orion_conf_mbus_windows(struct usb_hcd *hcd, 121 const struct mbus_dram_target_info *dram) 122 { 123 int i; 124 125 for (i = 0; i < 4; i++) { 126 wrl(USB_WINDOW_CTRL(i), 0); 127 wrl(USB_WINDOW_BASE(i), 0); 128 } 129 130 for (i = 0; i < dram->num_cs; i++) { 131 const struct mbus_dram_window *cs = dram->cs + i; 132 133 wrl(USB_WINDOW_CTRL(i), ((cs->size - 1) & 0xffff0000) | 134 (cs->mbus_attr << 8) | 135 (dram->mbus_dram_target_id << 4) | 1); 136 wrl(USB_WINDOW_BASE(i), cs->base); 137 } 138 } 139 140 static int ehci_orion_drv_probe(struct platform_device *pdev) 141 { 142 struct orion_ehci_data *pd = dev_get_platdata(&pdev->dev); 143 const struct mbus_dram_target_info *dram; 144 struct resource *res; 145 struct usb_hcd *hcd; 146 struct ehci_hcd *ehci; 147 struct clk *clk; 148 void __iomem *regs; 149 int irq, err; 150 enum orion_ehci_phy_ver phy_version; 151 152 if (usb_disabled()) 153 return -ENODEV; 154 155 pr_debug("Initializing Orion-SoC USB Host Controller\n"); 156 157 if (pdev->dev.of_node) 158 irq = irq_of_parse_and_map(pdev->dev.of_node, 0); 159 else 160 irq = platform_get_irq(pdev, 0); 161 if (irq <= 0) { 162 dev_err(&pdev->dev, 163 "Found HC with no IRQ. Check %s setup!\n", 164 dev_name(&pdev->dev)); 165 err = -ENODEV; 166 goto err1; 167 } 168 169 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 170 if (!res) { 171 dev_err(&pdev->dev, 172 "Found HC with no register addr. Check %s setup!\n", 173 dev_name(&pdev->dev)); 174 err = -ENODEV; 175 goto err1; 176 } 177 178 /* 179 * Right now device-tree probed devices don't get dma_mask 180 * set. Since shared usb code relies on it, set it here for 181 * now. Once we have dma capability bindings this can go away. 182 */ 183 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 184 if (err) 185 goto err1; 186 187 if (!request_mem_region(res->start, resource_size(res), 188 ehci_orion_hc_driver.description)) { 189 dev_dbg(&pdev->dev, "controller already in use\n"); 190 err = -EBUSY; 191 goto err1; 192 } 193 194 regs = ioremap(res->start, resource_size(res)); 195 if (regs == NULL) { 196 dev_dbg(&pdev->dev, "error mapping memory\n"); 197 err = -EFAULT; 198 goto err2; 199 } 200 201 /* Not all platforms can gate the clock, so it is not 202 an error if the clock does not exists. */ 203 clk = clk_get(&pdev->dev, NULL); 204 if (!IS_ERR(clk)) { 205 clk_prepare_enable(clk); 206 clk_put(clk); 207 } 208 209 hcd = usb_create_hcd(&ehci_orion_hc_driver, 210 &pdev->dev, dev_name(&pdev->dev)); 211 if (!hcd) { 212 err = -ENOMEM; 213 goto err3; 214 } 215 216 hcd->rsrc_start = res->start; 217 hcd->rsrc_len = resource_size(res); 218 hcd->regs = regs; 219 220 ehci = hcd_to_ehci(hcd); 221 ehci->caps = hcd->regs + 0x100; 222 hcd->has_tt = 1; 223 224 /* 225 * (Re-)program MBUS remapping windows if we are asked to. 226 */ 227 dram = mv_mbus_dram_info(); 228 if (dram) 229 ehci_orion_conf_mbus_windows(hcd, dram); 230 231 /* 232 * setup Orion USB controller. 233 */ 234 if (pdev->dev.of_node) 235 phy_version = EHCI_PHY_NA; 236 else 237 phy_version = pd->phy_version; 238 239 switch (phy_version) { 240 case EHCI_PHY_NA: /* dont change USB phy settings */ 241 break; 242 case EHCI_PHY_ORION: 243 orion_usb_phy_v1_setup(hcd); 244 break; 245 case EHCI_PHY_DD: 246 case EHCI_PHY_KW: 247 default: 248 printk(KERN_WARNING "Orion ehci -USB phy version isn't supported.\n"); 249 } 250 251 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 252 if (err) 253 goto err4; 254 255 return 0; 256 257 err4: 258 usb_put_hcd(hcd); 259 err3: 260 if (!IS_ERR(clk)) { 261 clk_disable_unprepare(clk); 262 clk_put(clk); 263 } 264 iounmap(regs); 265 err2: 266 release_mem_region(res->start, resource_size(res)); 267 err1: 268 dev_err(&pdev->dev, "init %s fail, %d\n", 269 dev_name(&pdev->dev), err); 270 271 return err; 272 } 273 274 static int ehci_orion_drv_remove(struct platform_device *pdev) 275 { 276 struct usb_hcd *hcd = platform_get_drvdata(pdev); 277 struct clk *clk; 278 279 usb_remove_hcd(hcd); 280 iounmap(hcd->regs); 281 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 282 usb_put_hcd(hcd); 283 284 clk = clk_get(&pdev->dev, NULL); 285 if (!IS_ERR(clk)) { 286 clk_disable_unprepare(clk); 287 clk_put(clk); 288 } 289 return 0; 290 } 291 292 static const struct of_device_id ehci_orion_dt_ids[] = { 293 { .compatible = "marvell,orion-ehci", }, 294 {}, 295 }; 296 MODULE_DEVICE_TABLE(of, ehci_orion_dt_ids); 297 298 static struct platform_driver ehci_orion_driver = { 299 .probe = ehci_orion_drv_probe, 300 .remove = ehci_orion_drv_remove, 301 .shutdown = usb_hcd_platform_shutdown, 302 .driver = { 303 .name = "orion-ehci", 304 .owner = THIS_MODULE, 305 .of_match_table = ehci_orion_dt_ids, 306 }, 307 }; 308 309 static int __init ehci_orion_init(void) 310 { 311 if (usb_disabled()) 312 return -ENODEV; 313 314 pr_info("%s: " DRIVER_DESC "\n", hcd_name); 315 316 ehci_init_driver(&ehci_orion_hc_driver, NULL); 317 return platform_driver_register(&ehci_orion_driver); 318 } 319 module_init(ehci_orion_init); 320 321 static void __exit ehci_orion_cleanup(void) 322 { 323 platform_driver_unregister(&ehci_orion_driver); 324 } 325 module_exit(ehci_orion_cleanup); 326 327 MODULE_DESCRIPTION(DRIVER_DESC); 328 MODULE_ALIAS("platform:orion-ehci"); 329 MODULE_AUTHOR("Tzachi Perelstein"); 330 MODULE_LICENSE("GPL v2"); 331