1 /* 2 * Efika 5K2 platform code 3 * Some code really inspired from the lite5200b platform. 4 * 5 * Copyright (C) 2006 bplan GmbH 6 * 7 * This file is licensed under the terms of the GNU General Public License 8 * version 2. This program is licensed "as is" without any warranty of any 9 * kind, whether express or implied. 10 */ 11 12 #include <linux/errno.h> 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/reboot.h> 16 #include <linux/init.h> 17 #include <linux/utsrelease.h> 18 #include <linux/seq_file.h> 19 #include <linux/string.h> 20 #include <linux/root_dev.h> 21 #include <linux/initrd.h> 22 #include <linux/timer.h> 23 #include <linux/pci.h> 24 25 #include <asm/io.h> 26 #include <asm/irq.h> 27 #include <asm/sections.h> 28 #include <asm/pci-bridge.h> 29 #include <asm/pgtable.h> 30 #include <asm/prom.h> 31 #include <asm/time.h> 32 #include <asm/machdep.h> 33 #include <asm/rtas.h> 34 #include <asm/of_device.h> 35 #include <asm/of_platform.h> 36 #include <asm/mpc52xx.h> 37 38 39 #define EFIKA_PLATFORM_NAME "Efika" 40 41 42 /* ------------------------------------------------------------------------ */ 43 /* PCI accesses thru RTAS */ 44 /* ------------------------------------------------------------------------ */ 45 46 #ifdef CONFIG_PCI 47 48 /* 49 * Access functions for PCI config space using RTAS calls. 50 */ 51 static int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset, 52 int len, u32 * val) 53 { 54 struct pci_controller *hose = bus->sysdata; 55 unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8) 56 | (((bus->number - hose->first_busno) & 0xff) << 16) 57 | (hose->index << 24); 58 int ret = -1; 59 int rval; 60 61 rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len); 62 *val = ret; 63 return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL; 64 } 65 66 static int rtas_write_config(struct pci_bus *bus, unsigned int devfn, 67 int offset, int len, u32 val) 68 { 69 struct pci_controller *hose = bus->sysdata; 70 unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8) 71 | (((bus->number - hose->first_busno) & 0xff) << 16) 72 | (hose->index << 24); 73 int rval; 74 75 rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL, 76 addr, len, val); 77 return rval ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL; 78 } 79 80 static struct pci_ops rtas_pci_ops = { 81 rtas_read_config, 82 rtas_write_config 83 }; 84 85 86 void __init efika_pcisetup(void) 87 { 88 const int *bus_range; 89 int len; 90 struct pci_controller *hose; 91 struct device_node *root; 92 struct device_node *pcictrl; 93 94 root = of_find_node_by_path("/"); 95 if (root == NULL) { 96 printk(KERN_WARNING EFIKA_PLATFORM_NAME 97 ": Unable to find the root node\n"); 98 return; 99 } 100 101 for (pcictrl = NULL;;) { 102 pcictrl = of_get_next_child(root, pcictrl); 103 if ((pcictrl == NULL) || (strcmp(pcictrl->name, "pci") == 0)) 104 break; 105 } 106 107 of_node_put(root); 108 109 if (pcictrl == NULL) { 110 printk(KERN_WARNING EFIKA_PLATFORM_NAME 111 ": Unable to find the PCI bridge node\n"); 112 return; 113 } 114 115 bus_range = get_property(pcictrl, "bus-range", &len); 116 if (bus_range == NULL || len < 2 * sizeof(int)) { 117 printk(KERN_WARNING EFIKA_PLATFORM_NAME 118 ": Can't get bus-range for %s\n", pcictrl->full_name); 119 return; 120 } 121 122 if (bus_range[1] == bus_range[0]) 123 printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI bus %d", 124 bus_range[0]); 125 else 126 printk(KERN_INFO EFIKA_PLATFORM_NAME ": PCI buses %d..%d", 127 bus_range[0], bus_range[1]); 128 printk(" controlled by %s\n", pcictrl->full_name); 129 printk("\n"); 130 131 hose = pcibios_alloc_controller(); 132 if (!hose) { 133 printk(KERN_WARNING EFIKA_PLATFORM_NAME 134 ": Can't allocate PCI controller structure for %s\n", 135 pcictrl->full_name); 136 return; 137 } 138 139 hose->arch_data = of_node_get(pcictrl); 140 hose->first_busno = bus_range[0]; 141 hose->last_busno = bus_range[1]; 142 hose->ops = &rtas_pci_ops; 143 144 pci_process_bridge_OF_ranges(hose, pcictrl, 0); 145 } 146 147 #else 148 void __init efika_pcisetup(void) 149 {} 150 #endif 151 152 153 154 /* ------------------------------------------------------------------------ */ 155 /* Platform setup */ 156 /* ------------------------------------------------------------------------ */ 157 158 static void efika_show_cpuinfo(struct seq_file *m) 159 { 160 struct device_node *root; 161 const char *revision = NULL; 162 const char *codegendescription = NULL; 163 const char *codegenvendor = NULL; 164 165 root = of_find_node_by_path("/"); 166 if (!root) 167 return; 168 169 revision = get_property(root, "revision", NULL); 170 codegendescription = 171 get_property(root, "CODEGEN,description", NULL); 172 codegenvendor = get_property(root, "CODEGEN,vendor", NULL); 173 174 if (codegendescription) 175 seq_printf(m, "machine\t\t: %s\n", codegendescription); 176 else 177 seq_printf(m, "machine\t\t: Efika\n"); 178 179 if (revision) 180 seq_printf(m, "revision\t: %s\n", revision); 181 182 if (codegenvendor) 183 seq_printf(m, "vendor\t\t: %s\n", codegenvendor); 184 185 of_node_put(root); 186 } 187 188 static void __init efika_setup_arch(void) 189 { 190 rtas_initialize(); 191 192 #ifdef CONFIG_BLK_DEV_INITRD 193 initrd_below_start_ok = 1; 194 195 if (initrd_start) 196 ROOT_DEV = Root_RAM0; 197 else 198 #endif 199 ROOT_DEV = Root_SDA2; /* sda2 (sda1 is for the kernel) */ 200 201 efika_pcisetup(); 202 203 if (ppc_md.progress) 204 ppc_md.progress("Linux/PPC " UTS_RELEASE " running on Efika ;-)\n", 0x0); 205 } 206 207 static int __init efika_probe(void) 208 { 209 char *model = of_get_flat_dt_prop(of_get_flat_dt_root(), 210 "model", NULL); 211 212 if (model == NULL) 213 return 0; 214 if (strcmp(model, "EFIKA5K2")) 215 return 0; 216 217 ISA_DMA_THRESHOLD = ~0L; 218 DMA_MODE_READ = 0x44; 219 DMA_MODE_WRITE = 0x48; 220 221 return 1; 222 } 223 224 define_machine(efika) 225 { 226 .name = EFIKA_PLATFORM_NAME, 227 .probe = efika_probe, 228 .setup_arch = efika_setup_arch, 229 .init = mpc52xx_declare_of_platform_devices, 230 .show_cpuinfo = efika_show_cpuinfo, 231 .init_IRQ = mpc52xx_init_irq, 232 .get_irq = mpc52xx_get_irq, 233 .restart = rtas_restart, 234 .power_off = rtas_power_off, 235 .halt = rtas_halt, 236 .set_rtc_time = rtas_set_rtc_time, 237 .get_rtc_time = rtas_get_rtc_time, 238 .progress = rtas_progress, 239 .get_boot_time = rtas_get_boot_time, 240 .calibrate_decr = generic_calibrate_decr, 241 .phys_mem_access_prot = pci_phys_mem_access_prot, 242 }; 243 244