1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * This contain platform specific code for APM PPC460EX based Canyonlands 4 * board. 5 * 6 * Copyright (c) 2010, Applied Micro Circuits Corporation 7 * Author: Rupjyoti Sarmah <rsarmah@apm.com> 8 */ 9 #include <linux/kernel.h> 10 #include <linux/init.h> 11 #include <asm/pci-bridge.h> 12 #include <asm/ppc4xx.h> 13 #include <asm/udbg.h> 14 #include <asm/uic.h> 15 #include <linux/of_address.h> 16 #include <linux/of_platform.h> 17 #include <linux/delay.h> 18 #include "44x.h" 19 20 #define BCSR_USB_EN 0x11 21 22 static const struct of_device_id ppc460ex_of_bus[] __initconst = { 23 { .compatible = "ibm,plb4", }, 24 { .compatible = "ibm,opb", }, 25 { .compatible = "ibm,ebc", }, 26 { .compatible = "simple-bus", }, 27 {}, 28 }; 29 30 static int __init ppc460ex_device_probe(void) 31 { 32 of_platform_bus_probe(NULL, ppc460ex_of_bus, NULL); 33 34 return 0; 35 } 36 machine_device_initcall(canyonlands, ppc460ex_device_probe); 37 38 /* Using this code only for the Canyonlands board. */ 39 40 static int __init ppc460ex_probe(void) 41 { 42 if (of_machine_is_compatible("amcc,canyonlands")) { 43 pci_set_flags(PCI_REASSIGN_ALL_RSRC); 44 return 1; 45 } 46 return 0; 47 } 48 49 /* USB PHY fixup code on Canyonlands kit. */ 50 51 static int __init ppc460ex_canyonlands_fixup(void) 52 { 53 u8 __iomem *bcsr ; 54 void __iomem *vaddr; 55 struct device_node *np; 56 int ret = 0; 57 58 np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-bcsr"); 59 if (!np) { 60 printk(KERN_ERR "failed did not find amcc, ppc460ex bcsr node\n"); 61 return -ENODEV; 62 } 63 64 bcsr = of_iomap(np, 0); 65 of_node_put(np); 66 67 if (!bcsr) { 68 printk(KERN_CRIT "Could not remap bcsr\n"); 69 ret = -ENODEV; 70 goto err_bcsr; 71 } 72 73 np = of_find_compatible_node(NULL, NULL, "ibm,ppc4xx-gpio"); 74 if (!np) { 75 printk(KERN_ERR "failed did not find ibm,ppc4xx-gpio node\n"); 76 return -ENODEV; 77 } 78 79 vaddr = of_iomap(np, 0); 80 of_node_put(np); 81 82 if (!vaddr) { 83 printk(KERN_CRIT "Could not get gpio node address\n"); 84 ret = -ENODEV; 85 goto err_gpio; 86 } 87 /* Disable USB, through the BCSR7 bits */ 88 setbits8(&bcsr[7], BCSR_USB_EN); 89 90 /* Wait for a while after reset */ 91 msleep(100); 92 93 /* Enable USB here */ 94 clrbits8(&bcsr[7], BCSR_USB_EN); 95 96 /* 97 * Configure multiplexed gpio16 and gpio19 as alternate1 output 98 * source after USB reset. In this configuration gpio16 will be 99 * USB2HStop and gpio19 will be USB2DStop. For more details refer to 100 * table 34-7 of PPC460EX user manual. 101 */ 102 setbits32((vaddr + GPIO0_OSRH), 0x42000000); 103 setbits32((vaddr + GPIO0_TSRH), 0x42000000); 104 err_gpio: 105 iounmap(vaddr); 106 err_bcsr: 107 iounmap(bcsr); 108 return ret; 109 } 110 machine_device_initcall(canyonlands, ppc460ex_canyonlands_fixup); 111 define_machine(canyonlands) { 112 .name = "Canyonlands", 113 .probe = ppc460ex_probe, 114 .progress = udbg_progress, 115 .init_IRQ = uic_init_tree, 116 .get_irq = uic_get_irq, 117 .restart = ppc4xx_reset_system, 118 .calibrate_decr = generic_calibrate_decr, 119 }; 120