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/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 "SBC310: " fmt); } while (0) 47 #else 48 #define DBG (fmt...) do { } while (0) 49 #endif 50 51 void __iomem *sbc310_regs; 52 53 static void __init gef_sbc310_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 "SBC310: No FPGA PIC\n"); 66 return; 67 } 68 69 gef_pic_init(cascade_node); 70 of_node_put(cascade_node); 71 } 72 73 static void __init gef_sbc310_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 SBC310 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 sbc310_regs = of_iomap(regs, 0); 94 if (sbc310_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 */ 105 static unsigned int gef_sbc310_get_board_id(void) 106 { 107 unsigned int reg; 108 109 reg = ioread32(sbc310_regs); 110 return reg & 0xff; 111 } 112 113 /* Return the PCB revision */ 114 static unsigned int gef_sbc310_get_pcb_rev(void) 115 { 116 unsigned int reg; 117 118 reg = ioread32(sbc310_regs); 119 return (reg >> 8) & 0xff; 120 } 121 122 /* Return the board (software) revision */ 123 static unsigned int gef_sbc310_get_board_rev(void) 124 { 125 unsigned int reg; 126 127 reg = ioread32(sbc310_regs); 128 return (reg >> 16) & 0xff; 129 } 130 131 /* Return the FPGA revision */ 132 static unsigned int gef_sbc310_get_fpga_rev(void) 133 { 134 unsigned int reg; 135 136 reg = ioread32(sbc310_regs); 137 return (reg >> 24) & 0xf; 138 } 139 140 static void gef_sbc310_show_cpuinfo(struct seq_file *m) 141 { 142 uint svid = mfspr(SPRN_SVR); 143 144 seq_printf(m, "Vendor\t\t: GE Intelligent Platforms\n"); 145 146 seq_printf(m, "Board ID\t: 0x%2.2x\n", gef_sbc310_get_board_id()); 147 seq_printf(m, "Revision\t: %u%c\n", gef_sbc310_get_pcb_rev(), 148 ('A' + gef_sbc310_get_board_rev() - 1)); 149 seq_printf(m, "FPGA Revision\t: %u\n", gef_sbc310_get_fpga_rev()); 150 151 seq_printf(m, "SVR\t\t: 0x%x\n", svid); 152 153 } 154 155 static void __devinit gef_sbc310_nec_fixup(struct pci_dev *pdev) 156 { 157 unsigned int val; 158 159 /* Do not do the fixup on other platforms! */ 160 if (!machine_is(gef_sbc310)) 161 return; 162 163 printk(KERN_INFO "Running NEC uPD720101 Fixup\n"); 164 165 /* Ensure only ports 1 & 2 are enabled */ 166 pci_read_config_dword(pdev, 0xe0, &val); 167 pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x2); 168 169 /* System clock is 48-MHz Oscillator and EHCI Enabled. */ 170 pci_write_config_dword(pdev, 0xe4, 1 << 5); 171 } 172 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB, 173 gef_sbc310_nec_fixup); 174 175 /* 176 * Called very early, device-tree isn't unflattened 177 * 178 * This function is called to determine whether the BSP is compatible with the 179 * supplied device-tree, which is assumed to be the correct one for the actual 180 * board. It is expected thati, in the future, a kernel may support multiple 181 * boards. 182 */ 183 static int __init gef_sbc310_probe(void) 184 { 185 unsigned long root = of_get_flat_dt_root(); 186 187 if (of_flat_dt_is_compatible(root, "gef,sbc310")) 188 return 1; 189 190 return 0; 191 } 192 193 static long __init mpc86xx_time_init(void) 194 { 195 unsigned int temp; 196 197 /* Set the time base to zero */ 198 mtspr(SPRN_TBWL, 0); 199 mtspr(SPRN_TBWU, 0); 200 201 temp = mfspr(SPRN_HID0); 202 temp |= HID0_TBEN; 203 mtspr(SPRN_HID0, temp); 204 asm volatile("isync"); 205 206 return 0; 207 } 208 209 static __initdata struct of_device_id of_bus_ids[] = { 210 { .compatible = "simple-bus", }, 211 { .compatible = "gianfar", }, 212 {}, 213 }; 214 215 static int __init declare_of_platform_devices(void) 216 { 217 printk(KERN_DEBUG "Probe platform devices\n"); 218 of_platform_bus_probe(NULL, of_bus_ids, NULL); 219 220 return 0; 221 } 222 machine_device_initcall(gef_sbc310, declare_of_platform_devices); 223 224 define_machine(gef_sbc310) { 225 .name = "GE SBC310", 226 .probe = gef_sbc310_probe, 227 .setup_arch = gef_sbc310_setup_arch, 228 .init_IRQ = gef_sbc310_init_irq, 229 .show_cpuinfo = gef_sbc310_show_cpuinfo, 230 .get_irq = mpic_get_irq, 231 .restart = fsl_rstcr_restart, 232 .time_init = mpc86xx_time_init, 233 .calibrate_decr = generic_calibrate_decr, 234 .progress = udbg_progress, 235 #ifdef CONFIG_PCI 236 .pcibios_fixup_bus = fsl_pcibios_fixup_bus, 237 #endif 238 }; 239