1 /* 2 * This contain platform specific code for APM PPC460EX based Canyonlands 3 * board. 4 * 5 * Copyright (c) 2010, Applied Micro Circuits Corporation 6 * Author: Rupjyoti Sarmah <rsarmah@apm.com> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 * 23 */ 24 #include <linux/kernel.h> 25 #include <linux/init.h> 26 #include <asm/pci-bridge.h> 27 #include <asm/ppc4xx.h> 28 #include <asm/udbg.h> 29 #include <asm/uic.h> 30 #include <linux/of_platform.h> 31 #include <linux/delay.h> 32 #include "44x.h" 33 34 #define BCSR_USB_EN 0x11 35 36 static __initdata struct of_device_id ppc460ex_of_bus[] = { 37 { .compatible = "ibm,plb4", }, 38 { .compatible = "ibm,opb", }, 39 { .compatible = "ibm,ebc", }, 40 { .compatible = "simple-bus", }, 41 {}, 42 }; 43 44 static int __init ppc460ex_device_probe(void) 45 { 46 of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL); 47 48 return 0; 49 } 50 machine_device_initcall(canyonlands, ppc460ex_device_probe); 51 52 /* Using this code only for the Canyonlands board. */ 53 54 static int __init ppc460ex_probe(void) 55 { 56 unsigned long root = of_get_flat_dt_root(); 57 if (of_flat_dt_is_compatible(root, "amcc,canyonlands")) { 58 pci_set_flags(PCI_REASSIGN_ALL_RSRC); 59 return 1; 60 } 61 return 0; 62 } 63 64 /* USB PHY fixup code on Canyonlands kit. */ 65 66 static int __init ppc460ex_canyonlands_fixup(void) 67 { 68 u8 __iomem *bcsr ; 69 void __iomem *vaddr; 70 struct device_node *np; 71 int ret = 0; 72 73 np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr"); 74 if (!np) { 75 printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n"); 76 return -ENODEV; 77 } 78 79 bcsr = of_iomap(np, 0); 80 of_node_put(np); 81 82 if (!bcsr) { 83 printk(KERN_CRIT "Could not remap bcsr\n"); 84 ret = -ENODEV; 85 goto err_bcsr; 86 } 87 88 np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio"); 89 if (!np) { 90 printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n"); 91 return -ENODEV; 92 } 93 94 vaddr = of_iomap(np, 0); 95 of_node_put(np); 96 97 if (!vaddr) { 98 printk(KERN_CRIT "Could not get gpio node address\n"); 99 ret = -ENODEV; 100 goto err_gpio; 101 } 102 /* Disable USB, through the BCSR7 bits */ 103 setbits8(&bcsr[7], BCSR_USB_EN); 104 105 /* Wait for a while after reset */ 106 msleep(100); 107 108 /* Enable USB here */ 109 clrbits8(&bcsr[7], BCSR_USB_EN); 110 111 /* 112 * Configure multiplexed gpio16 and gpio19 as alternate1 output 113 * source after USB reset. In this configuration gpio16 will be 114 * USB2HStop and gpio19 will be USB2DStop. For more details refer to 115 * table 34-7 of PPC460EX user manual. 116 */ 117 setbits32((vaddr + GPIO0_OSRH), 0x42000000); 118 setbits32((vaddr + GPIO0_TSRH), 0x42000000); 119 err_gpio: 120 iounmap(vaddr); 121 err_bcsr: 122 iounmap(bcsr); 123 return ret; 124 } 125 machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup); 126 define_machine(canyonlands) { 127 .name = "Canyonlands", 128 .probe = ppc460ex_probe, 129 .progress = udbg_progress, 130 .init_IRQ = uic_init_tree, 131 .get_irq = uic_get_irq, 132 .restart = ppc4xx_reset_system, 133 .calibrate_decr = generic_calibrate_decr, 134 }; 135