1 | /* PCI IRQ Library |
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2 | * |
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3 | * IRQ handling does not have so much with PCI to do, this library depends |
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4 | * on the BSP to implement shared interrupts. |
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5 | * |
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6 | * COPYRIGHT (c) 2010. |
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7 | * Cobham Gaisler AB. |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.rtems.com/license/LICENSE. |
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12 | */ |
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13 | |
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14 | #ifndef __PCI_IRQ_H__ |
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15 | #define __PCI_IRQ_H__ |
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16 | |
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17 | #include <bsp.h> |
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18 | |
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19 | /* PCI Handler (ISR) called when IRQ is generated by any of the PCI devices |
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20 | * connected to the same PCI IRQ Pin. This is been defined the same way as |
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21 | * rtems_interrupt_handler in order for BSPs to "direct-map" the register |
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22 | * and unregister functions rtems_interrupt_handler_install/remove |
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23 | */ |
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24 | typedef void (*pci_isr)(void *arg); |
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25 | |
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26 | /* Get assigned system IRQ to a PCI Device. If no IRQ 0 is returned */ |
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27 | extern int pci_dev_irq(pci_dev_t dev); |
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28 | |
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29 | /* Register shared PCI IRQ handler, but does not enable it. The system interrupt |
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30 | * number is read from the PCI board's PCI configuration space header iline |
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31 | * field. The iline field is initialized by the PCI subsystem during start up, |
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32 | * the ipin field is translated into a system IRQ and written to iline. The |
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33 | * board's driver should use the iline field as the irq argument to this |
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34 | * function. |
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35 | * |
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36 | * Arguments |
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37 | * irq System IRQ number, normally taken from the PCI configuration area |
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38 | * isr Function pointer to the ISR |
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39 | * arg Second argument to function isr |
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40 | */ |
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41 | static inline int pci_interrupt_register(int irq, const char *info, |
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42 | pci_isr isr, void *arg) |
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43 | { |
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44 | return BSP_PCI_shared_interrupt_register(irq, info, isr, arg); |
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45 | } |
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46 | |
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47 | /* Unregister previously registered shared PCI IRQ handler |
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48 | * |
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49 | * Arguments |
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50 | * irq System IRQ number, normally taken from the PCI configuration area |
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51 | * isr Function pointer to the ISR |
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52 | * arg Second argument to function isr |
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53 | */ |
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54 | static inline int pci_interrupt_unregister(int irq, pci_isr isr, void *arg) |
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55 | { |
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56 | return BSP_PCI_shared_interrupt_unregister(irq, isr, arg); |
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57 | } |
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58 | |
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59 | /* Enable shared PCI IRQ handler. This function will unmask the interrupt |
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60 | * controller and mark this interrupt handler ready to handle interrupts. Note |
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61 | * that since it is a shared interrupt handler service the interrupt may |
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62 | * already be enabled, however no calls to this specific handler is made |
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63 | * until it is enabled. |
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64 | * |
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65 | * Arguments |
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66 | * irq System IRQ number, normally taken from the PCI configuration area |
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67 | * isr Function pointer to the ISR |
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68 | * arg Second argument to function isr |
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69 | */ |
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70 | static inline void pci_interrupt_unmask(int irq) |
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71 | { |
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72 | BSP_PCI_shared_interrupt_unmask(irq); |
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73 | } |
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74 | |
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75 | /* Disable shared PCI IRQ handler. This function will mask the interrupt |
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76 | * controller and mark this interrupt handler not ready to receive interrupts. |
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77 | * Note that since it is a shared interrupt handler service the interrupt may |
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78 | * still be enabled, however no calls to this specific handler is made |
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79 | * while it is disabled. |
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80 | * |
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81 | * Arguments |
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82 | * irq System IRQ number, normally taken from the PCI configuration area |
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83 | * isr Function pointer to the ISR |
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84 | * arg Second argument to function isr |
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85 | */ |
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86 | static inline void pci_interrupt_mask(int irq) |
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87 | { |
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88 | BSP_PCI_shared_interrupt_mask(irq); |
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89 | } |
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90 | |
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91 | /* Acknowledge the interrupt controller by writing to the interrupt controller. |
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92 | * Note that since it is a shared interrupt handler service, clearing the |
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93 | * interrupt source may affect other ISRs registered to this IRQ. |
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94 | * |
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95 | * Arguments |
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96 | * irq System IRQ number, normally taken from the PCI configuration area |
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97 | * isr Function pointer to the ISR |
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98 | * arg Second argument to function isr |
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99 | */ |
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100 | static inline void pci_interrupt_clear(int irq) |
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101 | { |
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102 | BSP_PCI_shared_interrupt_clear(irq); |
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103 | } |
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104 | |
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105 | #endif /* !__PCI_IRQ_H__ */ |
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