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