1/* 2 * GE SBC610 board support 3 * 4 * Author: Martyn Welch <martyn.welch@ge.com> 5 * 6 * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc. 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 * Based on: mpc86xx_hpcn.c (MPC86xx HPCN board specific routines) 14 * Copyright 2006 Freescale Semiconductor Inc. 15 * 16 * NEC fixup adapted from arch/mips/pci/fixup-lm2e.c 17 */ 18 19#include <linux/stddef.h> 20#include <linux/kernel.h> 21#include <linux/pci.h> 22#include <linux/kdev_t.h> 23#include <linux/delay.h> 24#include <linux/seq_file.h> 25#include <linux/of_platform.h> 26 27#include <asm/time.h> 28#include <asm/machdep.h> 29#include <asm/pci-bridge.h> 30#include <asm/prom.h> 31#include <mm/mmu_decl.h> 32#include <asm/udbg.h> 33 34#include <asm/mpic.h> 35#include <asm/nvram.h> 36 37#include <sysdev/fsl_pci.h> 38#include <sysdev/fsl_soc.h> 39#include <sysdev/ge/ge_pic.h> 40 41#include "mpc86xx.h" 42 43#undef DEBUG 44 45#ifdef DEBUG 46#define DBG (fmt...) do { printk(KERN_ERR "SBC610: " fmt); } while (0) 47#else 48#define DBG (fmt...) do { } while (0) 49#endif 50 51void __iomem *sbc610_regs; 52 53static void __init gef_sbc610_init_irq(void) 54{ 55 struct device_node *cascade_node = NULL; 56 57 mpc86xx_init_irq(); 58 59 /* 60 * There is a simple interrupt handler in the main FPGA, this needs 61 * to be cascaded into the MPIC 62 */ 63 cascade_node = of_find_compatible_node(NULL, NULL, "gef,fpga-pic"); 64 if (!cascade_node) { 65 printk(KERN_WARNING "SBC610: No FPGA PIC\n"); 66 return; 67 } 68 69 gef_pic_init(cascade_node); 70 of_node_put(cascade_node); 71} 72 73static void __init gef_sbc610_setup_arch(void) 74{ 75 struct device_node *regs; 76#ifdef CONFIG_PCI 77 struct device_node *np; 78 79 for_each_compatible_node(np, "pci", "fsl,mpc8641-pcie") { 80 fsl_add_bridge(np, 1); 81 } 82#endif 83 84 printk(KERN_INFO "GE Intelligent Platforms SBC610 6U VPX SBC\n"); 85 86#ifdef CONFIG_SMP 87 mpc86xx_smp_init(); 88#endif 89 90 /* Remap basic board registers */ 91 regs = of_find_compatible_node(NULL, NULL, "gef,fpga-regs"); 92 if (regs) { 93 sbc610_regs = of_iomap(regs, 0); 94 if (sbc610_regs == NULL) 95 printk(KERN_WARNING "Unable to map board registers\n"); 96 of_node_put(regs); 97 } 98 99#if defined(CONFIG_MMIO_NVRAM) 100 mmio_nvram_init(); 101#endif 102} 103 104/* Return the PCB revision */ 105static unsigned int gef_sbc610_get_pcb_rev(void) 106{ 107 unsigned int reg; 108 109 reg = ioread32(sbc610_regs); 110 return (reg >> 8) & 0xff; 111} 112 113/* Return the board (software) revision */ 114static unsigned int gef_sbc610_get_board_rev(void) 115{ 116 unsigned int reg; 117 118 reg = ioread32(sbc610_regs); 119 return (reg >> 16) & 0xff; 120} 121 122/* Return the FPGA revision */ 123static unsigned int gef_sbc610_get_fpga_rev(void) 124{ 125 unsigned int reg; 126 127 reg = ioread32(sbc610_regs); 128 return (reg >> 24) & 0xf; 129} 130 131static void gef_sbc610_show_cpuinfo(struct seq_file *m) 132{ 133 uint svid = mfspr(SPRN_SVR); 134 135 seq_printf(m, "Vendor\t\t: GE Intelligent Platforms\n"); 136 137 seq_printf(m, "Revision\t: %u%c\n", gef_sbc610_get_pcb_rev(), 138 ('A' + gef_sbc610_get_board_rev() - 1)); 139 seq_printf(m, "FPGA Revision\t: %u\n", gef_sbc610_get_fpga_rev()); 140 141 seq_printf(m, "SVR\t\t: 0x%x\n", svid); 142} 143 144static void __init gef_sbc610_nec_fixup(struct pci_dev *pdev) 145{ 146 unsigned int val; 147 148 /* Do not do the fixup on other platforms! */ 149 if (!machine_is(gef_sbc610)) 150 return; 151 152 printk(KERN_INFO "Running NEC uPD720101 Fixup\n"); 153 154 /* Ensure ports 1, 2, 3, 4 & 5 are enabled */ 155 pci_read_config_dword(pdev, 0xe0, &val); 156 pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x5); 157 158 /* System clock is 48-MHz Oscillator and EHCI Enabled. */ 159 pci_write_config_dword(pdev, 0xe4, 1 << 5); 160} 161DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB, 162 gef_sbc610_nec_fixup); 163 164/* 165 * Called very early, device-tree isn't unflattened 166 * 167 * This function is called to determine whether the BSP is compatible with the 168 * supplied device-tree, which is assumed to be the correct one for the actual 169 * board. It is expected thati, in the future, a kernel may support multiple 170 * boards. 171 */ 172static int __init gef_sbc610_probe(void) 173{ 174 unsigned long root = of_get_flat_dt_root(); 175 176 if (of_flat_dt_is_compatible(root, "gef,sbc610")) 177 return 1; 178 179 return 0; 180} 181 182static long __init mpc86xx_time_init(void) 183{ 184 unsigned int temp; 185 186 /* Set the time base to zero */ 187 mtspr(SPRN_TBWL, 0); 188 mtspr(SPRN_TBWU, 0); 189 190 temp = mfspr(SPRN_HID0); 191 temp |= HID0_TBEN; 192 mtspr(SPRN_HID0, temp); 193 asm volatile("isync"); 194 195 return 0; 196} 197 198static __initdata struct of_device_id of_bus_ids[] = { 199 { .compatible = "simple-bus", }, 200 { .compatible = "gianfar", }, 201 {}, 202}; 203 204static int __init declare_of_platform_devices(void) 205{ 206 printk(KERN_DEBUG "Probe platform devices\n"); 207 of_platform_bus_probe(NULL, of_bus_ids, NULL); 208 209 return 0; 210} 211machine_device_initcall(gef_sbc610, declare_of_platform_devices); 212 213define_machine(gef_sbc610) { 214 .name = "GE SBC610", 215 .probe = gef_sbc610_probe, 216 .setup_arch = gef_sbc610_setup_arch, 217 .init_IRQ = gef_sbc610_init_irq, 218 .show_cpuinfo = gef_sbc610_show_cpuinfo, 219 .get_irq = mpic_get_irq, 220 .restart = fsl_rstcr_restart, 221 .time_init = mpc86xx_time_init, 222 .calibrate_decr = generic_calibrate_decr, 223 .progress = udbg_progress, 224#ifdef CONFIG_PCI 225 .pcibios_fixup_bus = fsl_pcibios_fixup_bus, 226#endif 227}; 228