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->global_number << 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->global_number << 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 = of_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; 162 const char *codegendescription; 163 const char *codegenvendor; 164 165 root = of_find_node_by_path("/"); 166 if (!root) 167 return; 168 169 revision = of_get_property(root, "revision", NULL); 170 codegendescription = of_get_property(root, "CODEGEN,description", NULL); 171 codegenvendor = of_get_property(root, "CODEGEN,vendor", NULL); 172 173 if (codegendescription) 174 seq_printf(m, "machine\t\t: %s\n", codegendescription); 175 else 176 seq_printf(m, "machine\t\t: Efika\n"); 177 178 if (revision) 179 seq_printf(m, "revision\t: %s\n", revision); 180 181 if (codegenvendor) 182 seq_printf(m, "vendor\t\t: %s\n", codegenvendor); 183 184 of_node_put(root); 185 } 186 187 #ifdef CONFIG_PM 188 static void efika_suspend_prepare(void __iomem *mbar) 189 { 190 u8 pin = 4; /* GPIO_WKUP_4 (GPIO_PSC6_0 - IRDA_RX) */ 191 u8 level = 1; /* wakeup on high level */ 192 /* IOW. to wake it up, short pins 1 and 3 on IRDA connector */ 193 mpc52xx_set_wakeup_gpio(pin, level); 194 } 195 #endif 196 197 static void __init efika_setup_arch(void) 198 { 199 rtas_initialize(); 200 201 #ifdef CONFIG_BLK_DEV_INITRD 202 initrd_below_start_ok = 1; 203 204 if (initrd_start) 205 ROOT_DEV = Root_RAM0; 206 else 207 #endif 208 ROOT_DEV = Root_SDA2; /* sda2 (sda1 is for the kernel) */ 209 210 efika_pcisetup(); 211 212 #ifdef CONFIG_PM 213 mpc52xx_suspend.board_suspend_prepare = efika_suspend_prepare; 214 mpc52xx_pm_init(); 215 #endif 216 217 if (ppc_md.progress) 218 ppc_md.progress("Linux/PPC " UTS_RELEASE " running on Efika ;-)\n", 0x0); 219 } 220 221 static int __init efika_probe(void) 222 { 223 char *model = of_get_flat_dt_prop(of_get_flat_dt_root(), 224 "model", NULL); 225 226 if (model == NULL) 227 return 0; 228 if (strcmp(model, "EFIKA5K2")) 229 return 0; 230 231 ISA_DMA_THRESHOLD = ~0L; 232 DMA_MODE_READ = 0x44; 233 DMA_MODE_WRITE = 0x48; 234 235 return 1; 236 } 237 238 define_machine(efika) 239 { 240 .name = EFIKA_PLATFORM_NAME, 241 .probe = efika_probe, 242 .setup_arch = efika_setup_arch, 243 .init = mpc52xx_declare_of_platform_devices, 244 .show_cpuinfo = efika_show_cpuinfo, 245 .init_IRQ = mpc52xx_init_irq, 246 .get_irq = mpc52xx_get_irq, 247 .restart = rtas_restart, 248 .power_off = rtas_power_off, 249 .halt = rtas_halt, 250 .set_rtc_time = rtas_set_rtc_time, 251 .get_rtc_time = rtas_get_rtc_time, 252 .progress = rtas_progress, 253 .get_boot_time = rtas_get_boot_time, 254 .calibrate_decr = generic_calibrate_decr, 255 #ifdef CONFIG_PCI 256 .phys_mem_access_prot = pci_phys_mem_access_prot, 257 #endif 258 }; 259 260