1/* 2 * GE SBC310 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/system.h> 28#include <asm/time.h> 29#include <asm/machdep.h> 30#include <asm/pci-bridge.h> 31#include <asm/prom.h> 32#include <mm/mmu_decl.h> 33#include <asm/udbg.h> 34 35#include <asm/mpic.h> 36#include <asm/nvram.h> 37 38#include <sysdev/fsl_pci.h> 39#include <sysdev/fsl_soc.h> 40 41#include "mpc86xx.h" 42#include "gef_pic.h" 43 44#undef DEBUG 45 46#ifdef DEBUG 47#define DBG (fmt...) do { printk(KERN_ERR "SBC310: " fmt); } while (0) 48#else 49#define DBG (fmt...) do { } while (0) 50#endif 51 52void __iomem *sbc310_regs; 53 54static void __init gef_sbc310_init_irq(void) 55{ 56 struct device_node *cascade_node = NULL; 57 58 mpc86xx_init_irq(); 59 60 /* 61 * There is a simple interrupt handler in the main FPGA, this needs 62 * to be cascaded into the MPIC 63 */ 64 cascade_node = of_find_compatible_node(NULL, NULL, "gef,fpga-pic"); 65 if (!cascade_node) { 66 printk(KERN_WARNING "SBC310: No FPGA PIC\n"); 67 return; 68 } 69 70 gef_pic_init(cascade_node); 71 of_node_put(cascade_node); 72} 73 74static void __init gef_sbc310_setup_arch(void) 75{ 76 struct device_node *regs; 77#ifdef CONFIG_PCI 78 struct device_node *np; 79 80 for_each_compatible_node(np, "pci", "fsl,mpc8641-pcie") { 81 fsl_add_bridge(np, 1); 82 } 83#endif 84 85 printk(KERN_INFO "GE Intelligent Platforms SBC310 6U VPX SBC\n"); 86 87#ifdef CONFIG_SMP 88 mpc86xx_smp_init(); 89#endif 90 91 /* Remap basic board registers */ 92 regs = of_find_compatible_node(NULL, NULL, "gef,fpga-regs"); 93 if (regs) { 94 sbc310_regs = of_iomap(regs, 0); 95 if (sbc310_regs == NULL) 96 printk(KERN_WARNING "Unable to map board registers\n"); 97 of_node_put(regs); 98 } 99 100#if defined(CONFIG_MMIO_NVRAM) 101 mmio_nvram_init(); 102#endif 103} 104 105/* Return the PCB revision */ 106static unsigned int gef_sbc310_get_board_id(void) 107{ 108 unsigned int reg; 109 110 reg = ioread32(sbc310_regs); 111 return reg & 0xff; 112} 113 114/* Return the PCB revision */ 115static unsigned int gef_sbc310_get_pcb_rev(void) 116{ 117 unsigned int reg; 118 119 reg = ioread32(sbc310_regs); 120 return (reg >> 8) & 0xff; 121} 122 123/* Return the board (software) revision */ 124static unsigned int gef_sbc310_get_board_rev(void) 125{ 126 unsigned int reg; 127 128 reg = ioread32(sbc310_regs); 129 return (reg >> 16) & 0xff; 130} 131 132/* Return the FPGA revision */ 133static unsigned int gef_sbc310_get_fpga_rev(void) 134{ 135 unsigned int reg; 136 137 reg = ioread32(sbc310_regs); 138 return (reg >> 24) & 0xf; 139} 140 141static void gef_sbc310_show_cpuinfo(struct seq_file *m) 142{ 143 uint svid = mfspr(SPRN_SVR); 144 145 seq_printf(m, "Vendor\t\t: GE Intelligent Platforms\n"); 146 147 seq_printf(m, "Board ID\t: 0x%2.2x\n", gef_sbc310_get_board_id()); 148 seq_printf(m, "Revision\t: %u%c\n", gef_sbc310_get_pcb_rev(), 149 ('A' + gef_sbc310_get_board_rev() - 1)); 150 seq_printf(m, "FPGA Revision\t: %u\n", gef_sbc310_get_fpga_rev()); 151 152 seq_printf(m, "SVR\t\t: 0x%x\n", svid); 153 154} 155 156static void __init gef_sbc310_nec_fixup(struct pci_dev *pdev) 157{ 158 unsigned int val; 159 160 /* Do not do the fixup on other platforms! */ 161 if (!machine_is(gef_sbc310)) 162 return; 163 164 printk(KERN_INFO "Running NEC uPD720101 Fixup\n"); 165 166 /* Ensure only ports 1 & 2 are enabled */ 167 pci_read_config_dword(pdev, 0xe0, &val); 168 pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x2); 169 170 /* System clock is 48-MHz Oscillator and EHCI Enabled. */ 171 pci_write_config_dword(pdev, 0xe4, 1 << 5); 172} 173DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB, 174 gef_sbc310_nec_fixup); 175 176/* 177 * Called very early, device-tree isn't unflattened 178 * 179 * This function is called to determine whether the BSP is compatible with the 180 * supplied device-tree, which is assumed to be the correct one for the actual 181 * board. It is expected thati, in the future, a kernel may support multiple 182 * boards. 183 */ 184static int __init gef_sbc310_probe(void) 185{ 186 unsigned long root = of_get_flat_dt_root(); 187 188 if (of_flat_dt_is_compatible(root, "gef,sbc310")) 189 return 1; 190 191 return 0; 192} 193 194static long __init mpc86xx_time_init(void) 195{ 196 unsigned int temp; 197 198 /* Set the time base to zero */ 199 mtspr(SPRN_TBWL, 0); 200 mtspr(SPRN_TBWU, 0); 201 202 temp = mfspr(SPRN_HID0); 203 temp |= HID0_TBEN; 204 mtspr(SPRN_HID0, temp); 205 asm volatile("isync"); 206 207 return 0; 208} 209 210static __initdata struct of_device_id of_bus_ids[] = { 211 { .compatible = "simple-bus", }, 212 { .compatible = "gianfar", }, 213 {}, 214}; 215 216static int __init declare_of_platform_devices(void) 217{ 218 printk(KERN_DEBUG "Probe platform devices\n"); 219 of_platform_bus_probe(NULL, of_bus_ids, NULL); 220 221 return 0; 222} 223machine_device_initcall(gef_sbc310, declare_of_platform_devices); 224 225define_machine(gef_sbc310) { 226 .name = "GE SBC310", 227 .probe = gef_sbc310_probe, 228 .setup_arch = gef_sbc310_setup_arch, 229 .init_IRQ = gef_sbc310_init_irq, 230 .show_cpuinfo = gef_sbc310_show_cpuinfo, 231 .get_irq = mpic_get_irq, 232 .restart = fsl_rstcr_restart, 233 .time_init = mpc86xx_time_init, 234 .calibrate_decr = generic_calibrate_decr, 235 .progress = udbg_progress, 236#ifdef CONFIG_PCI 237 .pcibios_fixup_bus = fsl_pcibios_fixup_bus, 238#endif 239}; 240