3 * Ricado Ribalda-Universidad Autonoma de Madrid-ricardo.ribalda@gmail.com
4 * This work has been supported by: QTechnology http://qtec.com/
5 * Based on interrupts.c Wolfgang Denk-DENX Software Engineering-wd@denx.de
6 * SPDX-License-Identifier: GPL-2.0+
11 #include <asm/processor.h>
12 #include <asm/interrupt.h>
13 #include <asm/ppc4xx.h>
14 #include <ppc_asm.tmpl>
16 #include <asm/xilinx_irq.h>
18 DECLARE_GLOBAL_DATA_PTR;
22 debug("Xilinx PIC at 0x%8x\n", intc);
25 * Disable all external interrupts until they are
26 * explicitly requested.
28 out_be32((u32 *) IER, 0);
30 /* Acknowledge any pending interrupts just in case. */
31 out_be32((u32 *) IAR, 0xffffffff);
33 /* Turn on the Master Enable. */
34 out_be32((u32 *) MER, 0x3UL);
39 int xilinx_pic_irq_get(void)
42 irq = in_be32((u32 *) IVR);
44 /* If no interrupt is pending then all bits of the IVR are set to 1. As
45 * the IVR is as many bits wide as numbers of inputs are available.
46 * Therefore, if all bits of the IVR are set to one, its content will
47 * be bigger than XPAR_INTC_MAX_NUM_INTR_INPUTS.
49 if (irq >= XPAR_INTC_MAX_NUM_INTR_INPUTS)
50 irq = -1; /* report no pending interrupt. */
52 debug("get_irq: %d\n", irq);
56 void pic_irq_enable(unsigned int irq)
58 u32 mask = IRQ_MASK(irq);
59 debug("enable: %d\n", irq);
60 out_be32((u32 *) SIE, mask);
63 void pic_irq_disable(unsigned int irq)
65 u32 mask = IRQ_MASK(irq);
66 debug("disable: %d\n", irq);
67 out_be32((u32 *) CIE, mask);
70 void pic_irq_ack(unsigned int irq)
72 u32 mask = IRQ_MASK(irq);
73 debug("ack: %d\n", irq);
74 out_be32((u32 *) IAR, mask);
77 void external_interrupt(struct pt_regs *regs)
81 irq = xilinx_pic_irq_get();
85 interrupt_run_handler(irq);