1 /* 2 * GE PPC9A 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 "PPC9A: " fmt); } while (0) 48 #else 49 #define DBG (fmt...) do { } while (0) 50 #endif 51 52 void __iomem *ppc9a_regs; 53 54 static void __init gef_ppc9a_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-1.00"); 65 if (!cascade_node) { 66 printk(KERN_WARNING "PPC9A: No FPGA PIC\n"); 67 return; 68 } 69 70 gef_pic_init(cascade_node); 71 of_node_put(cascade_node); 72 } 73 74 static void __init gef_ppc9a_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 PPC9A 6U VME 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,ppc9a-fpga-regs"); 93 if (regs) { 94 ppc9a_regs = of_iomap(regs, 0); 95 if (ppc9a_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 */ 106 static unsigned int gef_ppc9a_get_pcb_rev(void) 107 { 108 unsigned int reg; 109 110 reg = ioread32be(ppc9a_regs); 111 return (reg >> 16) & 0xff; 112 } 113 114 /* Return the board (software) revision */ 115 static unsigned int gef_ppc9a_get_board_rev(void) 116 { 117 unsigned int reg; 118 119 reg = ioread32be(ppc9a_regs); 120 return (reg >> 8) & 0xff; 121 } 122 123 /* Return the FPGA revision */ 124 static unsigned int gef_ppc9a_get_fpga_rev(void) 125 { 126 unsigned int reg; 127 128 reg = ioread32be(ppc9a_regs); 129 return reg & 0xf; 130 } 131 132 /* Return VME Geographical Address */ 133 static unsigned int gef_ppc9a_get_vme_geo_addr(void) 134 { 135 unsigned int reg; 136 137 reg = ioread32be(ppc9a_regs + 0x4); 138 return reg & 0x1f; 139 } 140 141 /* Return VME System Controller Status */ 142 static unsigned int gef_ppc9a_get_vme_is_syscon(void) 143 { 144 unsigned int reg; 145 146 reg = ioread32be(ppc9a_regs + 0x4); 147 return (reg >> 9) & 0x1; 148 } 149 150 static void gef_ppc9a_show_cpuinfo(struct seq_file *m) 151 { 152 uint svid = mfspr(SPRN_SVR); 153 154 seq_printf(m, "Vendor\t\t: GE Intelligent Platforms\n"); 155 156 seq_printf(m, "Revision\t: %u%c\n", gef_ppc9a_get_pcb_rev(), 157 ('A' + gef_ppc9a_get_board_rev())); 158 seq_printf(m, "FPGA Revision\t: %u\n", gef_ppc9a_get_fpga_rev()); 159 160 seq_printf(m, "SVR\t\t: 0x%x\n", svid); 161 162 seq_printf(m, "VME geo. addr\t: %u\n", gef_ppc9a_get_vme_geo_addr()); 163 164 seq_printf(m, "VME syscon\t: %s\n", 165 gef_ppc9a_get_vme_is_syscon() ? "yes" : "no"); 166 } 167 168 static void __init gef_ppc9a_nec_fixup(struct pci_dev *pdev) 169 { 170 unsigned int val; 171 172 /* Do not do the fixup on other platforms! */ 173 if (!machine_is(gef_ppc9a)) 174 return; 175 176 printk(KERN_INFO "Running NEC uPD720101 Fixup\n"); 177 178 /* Ensure ports 1, 2, 3, 4 & 5 are enabled */ 179 pci_read_config_dword(pdev, 0xe0, &val); 180 pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x5); 181 182 /* System clock is 48-MHz Oscillator and EHCI Enabled. */ 183 pci_write_config_dword(pdev, 0xe4, 1 << 5); 184 } 185 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB, 186 gef_ppc9a_nec_fixup); 187 188 /* 189 * Called very early, device-tree isn't unflattened 190 * 191 * This function is called to determine whether the BSP is compatible with the 192 * supplied device-tree, which is assumed to be the correct one for the actual 193 * board. It is expected thati, in the future, a kernel may support multiple 194 * boards. 195 */ 196 static int __init gef_ppc9a_probe(void) 197 { 198 unsigned long root = of_get_flat_dt_root(); 199 200 if (of_flat_dt_is_compatible(root, "gef,ppc9a")) 201 return 1; 202 203 return 0; 204 } 205 206 static long __init mpc86xx_time_init(void) 207 { 208 unsigned int temp; 209 210 /* Set the time base to zero */ 211 mtspr(SPRN_TBWL, 0); 212 mtspr(SPRN_TBWU, 0); 213 214 temp = mfspr(SPRN_HID0); 215 temp |= HID0_TBEN; 216 mtspr(SPRN_HID0, temp); 217 asm volatile("isync"); 218 219 return 0; 220 } 221 222 static __initdata struct of_device_id of_bus_ids[] = { 223 { .compatible = "simple-bus", }, 224 { .compatible = "gianfar", }, 225 {}, 226 }; 227 228 static int __init declare_of_platform_devices(void) 229 { 230 printk(KERN_DEBUG "Probe platform devices\n"); 231 of_platform_bus_probe(NULL, of_bus_ids, NULL); 232 233 return 0; 234 } 235 machine_device_initcall(gef_ppc9a, declare_of_platform_devices); 236 237 define_machine(gef_ppc9a) { 238 .name = "GE PPC9A", 239 .probe = gef_ppc9a_probe, 240 .setup_arch = gef_ppc9a_setup_arch, 241 .init_IRQ = gef_ppc9a_init_irq, 242 .show_cpuinfo = gef_ppc9a_show_cpuinfo, 243 .get_irq = mpic_get_irq, 244 .restart = fsl_rstcr_restart, 245 .time_init = mpc86xx_time_init, 246 .calibrate_decr = generic_calibrate_decr, 247 .progress = udbg_progress, 248 #ifdef CONFIG_PCI 249 .pcibios_fixup_bus = fsl_pcibios_fixup_bus, 250 #endif 251 }; 252