[ba46ffa6] | 1 | /* irq_init.c |
---|
| 2 | * |
---|
| 3 | * This file contains the implementation of rtems initialization |
---|
| 4 | * related to interrupt handling. |
---|
| 5 | * |
---|
| 6 | * CopyRight (C) 1999 valette@crf.canon.fr |
---|
| 7 | * |
---|
| 8 | * The license and distribution terms for this file may be |
---|
| 9 | * found in the file LICENSE in this distribution or at |
---|
| 10 | * http://www.OARcorp.com/rtems/license.html. |
---|
| 11 | * |
---|
| 12 | * $Id$ |
---|
| 13 | */ |
---|
| 14 | #include <bsp/consoleIo.h> |
---|
| 15 | #include <libcpu/io.h> |
---|
| 16 | #include <libcpu/spr.h> |
---|
| 17 | #include <bsp/pci.h> |
---|
| 18 | #include <bsp/residual.h> |
---|
| 19 | #include <bsp/openpic.h> |
---|
| 20 | #include <bsp/irq.h> |
---|
| 21 | #include <bsp.h> |
---|
| 22 | #include <libcpu/raw_exception.h> |
---|
| 23 | |
---|
| 24 | typedef struct { |
---|
| 25 | unsigned char bus; /* few chance the PCI/ISA bridge is not on first bus but ... */ |
---|
| 26 | unsigned char device; |
---|
| 27 | unsigned char function; |
---|
| 28 | } pci_isa_bridge_device; |
---|
| 29 | |
---|
| 30 | pci_isa_bridge_device* via_82c586 = 0; |
---|
| 31 | static pci_isa_bridge_device bridge; |
---|
| 32 | |
---|
| 33 | extern unsigned int external_exception_vector_prolog_code_size; |
---|
| 34 | extern void external_exception_vector_prolog_code(); |
---|
| 35 | extern unsigned int decrementer_exception_vector_prolog_code_size; |
---|
| 36 | extern void decrementer_exception_vector_prolog_code(); |
---|
| 37 | |
---|
| 38 | /* |
---|
| 39 | * default on/off function |
---|
| 40 | */ |
---|
| 41 | static void nop_func(){} |
---|
| 42 | /* |
---|
| 43 | * default isOn function |
---|
| 44 | */ |
---|
| 45 | static int not_connected() {return 0;} |
---|
| 46 | /* |
---|
| 47 | * default possible isOn function |
---|
| 48 | */ |
---|
| 49 | static int connected() {return 1;} |
---|
| 50 | |
---|
| 51 | static rtems_irq_connect_data rtemsIrq[BSP_IRQ_NUMBER]; |
---|
| 52 | static rtems_irq_global_settings initial_config; |
---|
| 53 | static rtems_irq_connect_data defaultIrq = { |
---|
| 54 | /* vectorIdex, hdl , on , off , isOn */ |
---|
| 55 | 0, nop_func , nop_func , nop_func , not_connected |
---|
| 56 | }; |
---|
| 57 | static rtems_irq_prio irqPrioTable[BSP_IRQ_NUMBER]={ |
---|
| 58 | /* |
---|
| 59 | * actual rpiorities for interrupt : |
---|
| 60 | * 0 means that only current interrupt is masked |
---|
| 61 | * 255 means all other interrupts are masked |
---|
| 62 | */ |
---|
| 63 | /* |
---|
| 64 | * ISA interrupts. |
---|
| 65 | * The second entry has a priority of 255 because |
---|
| 66 | * it is the slave pic entry and is should always remain |
---|
| 67 | * unmasked. |
---|
| 68 | */ |
---|
| 69 | 0,0, |
---|
| 70 | 255, |
---|
| 71 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
---|
| 72 | /* |
---|
| 73 | * PCI Interrupts |
---|
| 74 | */ |
---|
| 75 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* for raven prio 0 means unactive... */ |
---|
| 76 | /* |
---|
| 77 | * Processor exceptions handled as interrupts |
---|
| 78 | */ |
---|
| 79 | 0 |
---|
| 80 | }; |
---|
| 81 | |
---|
| 82 | static unsigned char mcp750_openpic_initsenses[] = { |
---|
| 83 | 1, /* MCP750_INT_PCB(8259) */ |
---|
| 84 | 0, /* MCP750_INT_FALCON_ECC_ERR */ |
---|
| 85 | 1, /* MCP750_INT_PCI_ETHERNET */ |
---|
| 86 | 1, /* MCP750_INT_PCI_PMC */ |
---|
| 87 | 1, /* MCP750_INT_PCI_WATCHDOG_TIMER1 */ |
---|
| 88 | 1, /* MCP750_INT_PCI_PRST_SIGNAL */ |
---|
| 89 | 1, /* MCP750_INT_PCI_FALL_SIGNAL */ |
---|
| 90 | 1, /* MCP750_INT_PCI_DEG_SIGNAL */ |
---|
| 91 | 1, /* MCP750_INT_PCI_BUS1_INTA */ |
---|
| 92 | 1, /* MCP750_INT_PCI_BUS1_INTB */ |
---|
| 93 | 1, /* MCP750_INT_PCI_BUS1_INTC */ |
---|
| 94 | 1, /* MCP750_INT_PCI_BUS1_INTD */ |
---|
| 95 | 1, /* MCP750_INT_PCI_BUS2_INTA */ |
---|
| 96 | 1, /* MCP750_INT_PCI_BUS2_INTB */ |
---|
| 97 | 1, /* MCP750_INT_PCI_BUS2_INTC */ |
---|
| 98 | 1, /* MCP750_INT_PCI_BUS2_INTD */ |
---|
| 99 | }; |
---|
| 100 | |
---|
| 101 | void isa_bridge_interrupts_setup(void) |
---|
| 102 | { |
---|
| 103 | pci_isa_bridge_device pci_dev; |
---|
[93180ea2] | 104 | unsigned int temp; |
---|
[ba46ffa6] | 105 | unsigned char tmp; |
---|
| 106 | unsigned char maxBus; |
---|
| 107 | unsigned found = 0; |
---|
| 108 | |
---|
| 109 | maxBus = BusCountPCI(); |
---|
| 110 | pci_dev.function = 0; /* Assumes the bidge is the first function */ |
---|
| 111 | |
---|
| 112 | for (pci_dev.bus = 0; pci_dev.bus < maxBus; pci_dev.bus++) { |
---|
| 113 | #ifdef SCAN_PCI_PRINT |
---|
| 114 | printk("isa_bridge_interrupts_setup: Scanning bus %d\n", pci_dev.bus); |
---|
| 115 | #endif |
---|
| 116 | for (pci_dev.device = 0; pci_dev.device < PCI_MAX_DEVICES; pci_dev.device++) { |
---|
| 117 | #ifdef SCAN_PCI_PRINT |
---|
| 118 | printk("isa_bridge_interrupts_setup: Scanning device %d\n", pci_dev.device); |
---|
| 119 | #endif |
---|
| 120 | pci_read_config_dword(pci_dev.bus, pci_dev.device, pci_dev.function, |
---|
| 121 | PCI_VENDOR_ID, &temp); |
---|
| 122 | #ifdef SCAN_PCI_PRINT |
---|
| 123 | printk("Vendor/device = %x\n", temp); |
---|
| 124 | #endif |
---|
| 125 | if ( (temp == (((unsigned short) PCI_VENDOR_ID_VIA) | (PCI_DEVICE_ID_VIA_82C586_1 << 16))) |
---|
| 126 | || |
---|
| 127 | (temp == (((unsigned short) PCI_VENDOR_ID_VIA) | (PCI_DEVICE_ID_VIA_82C586_0 << 16))) |
---|
| 128 | ) { |
---|
| 129 | bridge = pci_dev; |
---|
| 130 | via_82c586 = &bridge; |
---|
| 131 | /* |
---|
| 132 | * Should print : bus = 0, device = 11, function = 0 on a MCP750. |
---|
| 133 | */ |
---|
| 134 | printk("Via PCI/ISA bridge found at bus = %d, device = %d, function = %d\n", |
---|
| 135 | via_82c586->bus, |
---|
| 136 | via_82c586->device, |
---|
| 137 | via_82c586->function); |
---|
| 138 | found = 1; |
---|
| 139 | goto loop_exit; |
---|
| 140 | |
---|
| 141 | } |
---|
| 142 | } |
---|
| 143 | } |
---|
| 144 | loop_exit: |
---|
| 145 | if (!found) BSP_panic("VIA_82C586 PCI/ISA bridge not found!n"); |
---|
| 146 | |
---|
| 147 | tmp = inb(0x810); |
---|
| 148 | if ( !(tmp & 0x2)) { |
---|
| 149 | printk("This is a second generation MCP750 board\n"); |
---|
| 150 | printk("We must reprogram the PCI/ISA bridge...\n"); |
---|
| 151 | pci_read_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function, |
---|
| 152 | 0x47, &tmp); |
---|
| 153 | printk(" PCI ISA bridge control2 = %x\n", (unsigned) tmp); |
---|
| 154 | /* |
---|
| 155 | * Enable 4D0/4D1 ISA interrupt level/edge config registers |
---|
| 156 | */ |
---|
| 157 | tmp |= 0x20; |
---|
| 158 | pci_write_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function, |
---|
| 159 | 0x47, tmp); |
---|
| 160 | /* |
---|
| 161 | * Now program the ISA interrupt edge/level |
---|
| 162 | */ |
---|
| 163 | tmp = ELCRS_INT9_LVL | ELCRS_INT10_LVL | ELCRS_INT11_LVL; |
---|
| 164 | outb(tmp, ISA8259_S_ELCR); |
---|
| 165 | tmp = ELCRM_INT5_LVL; |
---|
| 166 | outb(tmp, ISA8259_M_ELCR);; |
---|
| 167 | /* |
---|
| 168 | * Set the Interrupt inputs to non-inverting level interrupt |
---|
| 169 | */ |
---|
| 170 | pci_read_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function, |
---|
| 171 | 0x54, &tmp); |
---|
| 172 | printk(" PCI ISA bridge PCI/IRQ Edge/Level Select = %x\n", (unsigned) tmp); |
---|
| 173 | tmp = 0; |
---|
| 174 | pci_write_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function, |
---|
| 175 | 0x54, tmp); |
---|
| 176 | } |
---|
| 177 | else { |
---|
| 178 | printk("This is a first generation MCP750 board\n"); |
---|
| 179 | printk("We just show the actual value used by PCI/ISA bridge\n"); |
---|
| 180 | pci_read_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function, |
---|
| 181 | 0x47, &tmp); |
---|
| 182 | printk(" PCI ISA bridge control2 = %x\n", (unsigned) tmp); |
---|
| 183 | /* |
---|
| 184 | * Enable 4D0/4D1 ISA interrupt level/edge config registers |
---|
| 185 | */ |
---|
| 186 | tmp |= 0x20; |
---|
| 187 | pci_write_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function, |
---|
| 188 | 0x47, tmp); |
---|
| 189 | tmp = inb(ISA8259_S_ELCR); |
---|
| 190 | printk(" PCI ISA bridge slave edge/level control bit = %x\n", (unsigned) tmp); |
---|
| 191 | tmp = inb(ISA8259_M_ELCR);; |
---|
| 192 | printk(" PCI ISA bridge master edge/level control bit = %x\n", (unsigned) tmp); |
---|
| 193 | /* |
---|
| 194 | * Must disable the 4D0/4D1 ISA interrupt level/edge config registers |
---|
| 195 | * or the card will die a soon as we we will enable external interrupts |
---|
| 196 | */ |
---|
| 197 | pci_read_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function, |
---|
| 198 | 0x47, &tmp); |
---|
| 199 | tmp &= ~(0x20); |
---|
| 200 | pci_write_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function, |
---|
| 201 | 0x47, tmp); |
---|
| 202 | /* |
---|
| 203 | * Show the Interrupt inputs inverting/non-inverting level status |
---|
| 204 | */ |
---|
| 205 | pci_read_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function, |
---|
| 206 | 0x54, &tmp); |
---|
| 207 | printk(" PCI ISA bridge PCI/IRQ Edge/Level Select = %x\n", (unsigned) tmp); |
---|
| 208 | } |
---|
| 209 | } |
---|
| 210 | |
---|
| 211 | /* |
---|
| 212 | * This code assumes the exceptions management setup has already |
---|
| 213 | * been done. We just need to replace the exceptions that will |
---|
| 214 | * be handled like interrupt. On mcp750/mpc750 this means the |
---|
| 215 | * decrementer exception and the external exception. |
---|
| 216 | */ |
---|
| 217 | void BSP_rtems_irq_mng_init(unsigned cpuId) |
---|
| 218 | { |
---|
| 219 | rtems_raw_except_connect_data vectorDesc; |
---|
| 220 | int i; |
---|
| 221 | |
---|
| 222 | /* |
---|
| 223 | * First initialize the Interrupt management hardware |
---|
| 224 | */ |
---|
| 225 | OpenPIC_InitSenses = mcp750_openpic_initsenses; |
---|
| 226 | OpenPIC_NumInitSenses = sizeof(mcp750_openpic_initsenses) / sizeof(char); |
---|
| 227 | printk("Going to initialize raven interrupt controller (openpic compliant)\n"); |
---|
| 228 | openpic_init(1); |
---|
| 229 | printk("Going to initialize the PCI/ISA bridge IRQ related setting (VIA 82C586)\n"); |
---|
| 230 | isa_bridge_interrupts_setup(); |
---|
| 231 | printk("Going to initialize the ISA PC legacy IRQ management hardware\n"); |
---|
| 232 | BSP_i8259s_init(); |
---|
| 233 | /* |
---|
| 234 | * Initialize Rtems management interrupt table |
---|
| 235 | */ |
---|
| 236 | /* |
---|
| 237 | * re-init the rtemsIrq table |
---|
| 238 | */ |
---|
| 239 | for (i = 0; i < BSP_IRQ_NUMBER; i++) { |
---|
| 240 | rtemsIrq[i] = defaultIrq; |
---|
| 241 | rtemsIrq[i].name = i; |
---|
| 242 | } |
---|
| 243 | /* |
---|
| 244 | * Init initial Interrupt management config |
---|
| 245 | */ |
---|
| 246 | initial_config.irqNb = BSP_IRQ_NUMBER; |
---|
| 247 | initial_config.defaultEntry = defaultIrq; |
---|
| 248 | initial_config.irqHdlTbl = rtemsIrq; |
---|
| 249 | initial_config.irqBase = BSP_ASM_IRQ_VECTOR_BASE; |
---|
| 250 | initial_config.irqPrioTbl = irqPrioTable; |
---|
| 251 | |
---|
| 252 | if (!BSP_rtems_irq_mngt_set(&initial_config)) { |
---|
| 253 | /* |
---|
| 254 | * put something here that will show the failure... |
---|
| 255 | */ |
---|
| 256 | BSP_panic("Unable to initialize RTEMS interrupt Management!!! System locked\n"); |
---|
| 257 | } |
---|
| 258 | |
---|
| 259 | /* |
---|
| 260 | * We must connect the raw irq handler for the two |
---|
| 261 | * expected interrupt sources : decrementer and external interrupts. |
---|
| 262 | */ |
---|
| 263 | vectorDesc.exceptIndex = ASM_DEC_VECTOR; |
---|
| 264 | vectorDesc.hdl.vector = ASM_DEC_VECTOR; |
---|
| 265 | vectorDesc.hdl.raw_hdl = decrementer_exception_vector_prolog_code; |
---|
[93180ea2] | 266 | vectorDesc.hdl.raw_hdl_size = (unsigned) &decrementer_exception_vector_prolog_code_size; |
---|
[ba46ffa6] | 267 | vectorDesc.on = nop_func; |
---|
| 268 | vectorDesc.off = nop_func; |
---|
| 269 | vectorDesc.isOn = connected; |
---|
| 270 | if (!mpc60x_set_exception (&vectorDesc)) { |
---|
| 271 | BSP_panic("Unable to initialize RTEMS decrementer raw exception\n"); |
---|
| 272 | } |
---|
| 273 | vectorDesc.exceptIndex = ASM_EXT_VECTOR; |
---|
| 274 | vectorDesc.hdl.vector = ASM_EXT_VECTOR; |
---|
| 275 | vectorDesc.hdl.raw_hdl = external_exception_vector_prolog_code; |
---|
[93180ea2] | 276 | vectorDesc.hdl.raw_hdl_size = (unsigned) &external_exception_vector_prolog_code_size; |
---|
[ba46ffa6] | 277 | if (!mpc60x_set_exception (&vectorDesc)) { |
---|
| 278 | BSP_panic("Unable to initialize RTEMS external raw exception\n"); |
---|
| 279 | } |
---|
| 280 | printk("RTEMS IRQ management is now operationnal\n"); |
---|
| 281 | } |
---|
| 282 | |
---|