ae03550500
Impact: cleanup Convert the last remaining users to struct irq_desc. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
497 lines
14 KiB
C
497 lines
14 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2004-2008 Cavium Networks
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*/
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/hardirq.h>
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#include <asm/octeon/octeon.h>
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DEFINE_RWLOCK(octeon_irq_ciu0_rwlock);
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DEFINE_RWLOCK(octeon_irq_ciu1_rwlock);
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DEFINE_SPINLOCK(octeon_irq_msi_lock);
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static void octeon_irq_core_ack(unsigned int irq)
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{
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unsigned int bit = irq - OCTEON_IRQ_SW0;
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/*
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* We don't need to disable IRQs to make these atomic since
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* they are already disabled earlier in the low level
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* interrupt code.
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*/
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clear_c0_status(0x100 << bit);
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/* The two user interrupts must be cleared manually. */
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if (bit < 2)
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clear_c0_cause(0x100 << bit);
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}
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static void octeon_irq_core_eoi(unsigned int irq)
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{
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struct irq_desc *desc = irq_desc + irq;
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unsigned int bit = irq - OCTEON_IRQ_SW0;
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/*
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* If an IRQ is being processed while we are disabling it the
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* handler will attempt to unmask the interrupt after it has
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* been disabled.
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*/
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if (desc->status & IRQ_DISABLED)
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return;
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/* There is a race here. We should fix it. */
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/*
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* We don't need to disable IRQs to make these atomic since
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* they are already disabled earlier in the low level
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* interrupt code.
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*/
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set_c0_status(0x100 << bit);
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}
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static void octeon_irq_core_enable(unsigned int irq)
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{
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unsigned long flags;
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unsigned int bit = irq - OCTEON_IRQ_SW0;
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/*
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* We need to disable interrupts to make sure our updates are
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* atomic.
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*/
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local_irq_save(flags);
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set_c0_status(0x100 << bit);
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local_irq_restore(flags);
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}
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static void octeon_irq_core_disable_local(unsigned int irq)
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{
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unsigned long flags;
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unsigned int bit = irq - OCTEON_IRQ_SW0;
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/*
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* We need to disable interrupts to make sure our updates are
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* atomic.
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*/
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local_irq_save(flags);
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clear_c0_status(0x100 << bit);
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local_irq_restore(flags);
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}
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static void octeon_irq_core_disable(unsigned int irq)
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{
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#ifdef CONFIG_SMP
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on_each_cpu((void (*)(void *)) octeon_irq_core_disable_local,
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(void *) (long) irq, 1);
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#else
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octeon_irq_core_disable_local(irq);
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#endif
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}
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static struct irq_chip octeon_irq_chip_core = {
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.name = "Core",
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.enable = octeon_irq_core_enable,
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.disable = octeon_irq_core_disable,
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.ack = octeon_irq_core_ack,
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.eoi = octeon_irq_core_eoi,
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};
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static void octeon_irq_ciu0_ack(unsigned int irq)
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{
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/*
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* In order to avoid any locking accessing the CIU, we
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* acknowledge CIU interrupts by disabling all of them. This
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* way we can use a per core register and avoid any out of
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* core locking requirements. This has the side affect that
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* CIU interrupts can't be processed recursively.
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*
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* We don't need to disable IRQs to make these atomic since
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* they are already disabled earlier in the low level
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* interrupt code.
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*/
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clear_c0_status(0x100 << 2);
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}
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static void octeon_irq_ciu0_eoi(unsigned int irq)
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{
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/*
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* Enable all CIU interrupts again. We don't need to disable
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* IRQs to make these atomic since they are already disabled
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* earlier in the low level interrupt code.
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*/
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set_c0_status(0x100 << 2);
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}
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static void octeon_irq_ciu0_enable(unsigned int irq)
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{
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int coreid = cvmx_get_core_num();
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unsigned long flags;
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uint64_t en0;
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int bit = irq - OCTEON_IRQ_WORKQ0; /* Bit 0-63 of EN0 */
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/*
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* A read lock is used here to make sure only one core is ever
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* updating the CIU enable bits at a time. During an enable
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* the cores don't interfere with each other. During a disable
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* the write lock stops any enables that might cause a
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* problem.
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*/
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read_lock_irqsave(&octeon_irq_ciu0_rwlock, flags);
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en0 = cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
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en0 |= 1ull << bit;
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cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0);
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cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
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read_unlock_irqrestore(&octeon_irq_ciu0_rwlock, flags);
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}
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static void octeon_irq_ciu0_disable(unsigned int irq)
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{
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int bit = irq - OCTEON_IRQ_WORKQ0; /* Bit 0-63 of EN0 */
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unsigned long flags;
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uint64_t en0;
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#ifdef CONFIG_SMP
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int cpu;
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write_lock_irqsave(&octeon_irq_ciu0_rwlock, flags);
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for_each_online_cpu(cpu) {
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int coreid = cpu_logical_map(cpu);
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en0 = cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
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en0 &= ~(1ull << bit);
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cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0);
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}
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/*
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* We need to do a read after the last update to make sure all
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* of them are done.
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*/
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cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num() * 2));
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write_unlock_irqrestore(&octeon_irq_ciu0_rwlock, flags);
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#else
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int coreid = cvmx_get_core_num();
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local_irq_save(flags);
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en0 = cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
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en0 &= ~(1ull << bit);
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cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0);
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cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
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local_irq_restore(flags);
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#endif
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}
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#ifdef CONFIG_SMP
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static void octeon_irq_ciu0_set_affinity(unsigned int irq, const struct cpumask *dest)
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{
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int cpu;
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int bit = irq - OCTEON_IRQ_WORKQ0; /* Bit 0-63 of EN0 */
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write_lock(&octeon_irq_ciu0_rwlock);
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for_each_online_cpu(cpu) {
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int coreid = cpu_logical_map(cpu);
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uint64_t en0 =
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cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2));
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if (cpumask_test_cpu(cpu, dest))
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en0 |= 1ull << bit;
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else
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en0 &= ~(1ull << bit);
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cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0);
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}
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/*
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* We need to do a read after the last update to make sure all
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* of them are done.
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*/
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cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num() * 2));
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write_unlock(&octeon_irq_ciu0_rwlock);
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}
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#endif
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static struct irq_chip octeon_irq_chip_ciu0 = {
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.name = "CIU0",
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.enable = octeon_irq_ciu0_enable,
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.disable = octeon_irq_ciu0_disable,
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.ack = octeon_irq_ciu0_ack,
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.eoi = octeon_irq_ciu0_eoi,
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#ifdef CONFIG_SMP
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.set_affinity = octeon_irq_ciu0_set_affinity,
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#endif
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};
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static void octeon_irq_ciu1_ack(unsigned int irq)
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{
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/*
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* In order to avoid any locking accessing the CIU, we
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* acknowledge CIU interrupts by disabling all of them. This
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* way we can use a per core register and avoid any out of
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* core locking requirements. This has the side affect that
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* CIU interrupts can't be processed recursively. We don't
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* need to disable IRQs to make these atomic since they are
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* already disabled earlier in the low level interrupt code.
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*/
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clear_c0_status(0x100 << 3);
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}
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static void octeon_irq_ciu1_eoi(unsigned int irq)
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{
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/*
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* Enable all CIU interrupts again. We don't need to disable
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* IRQs to make these atomic since they are already disabled
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* earlier in the low level interrupt code.
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*/
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set_c0_status(0x100 << 3);
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}
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static void octeon_irq_ciu1_enable(unsigned int irq)
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{
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int coreid = cvmx_get_core_num();
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unsigned long flags;
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uint64_t en1;
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int bit = irq - OCTEON_IRQ_WDOG0; /* Bit 0-63 of EN1 */
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/*
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* A read lock is used here to make sure only one core is ever
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* updating the CIU enable bits at a time. During an enable
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* the cores don't interfere with each other. During a disable
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* the write lock stops any enables that might cause a
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* problem.
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*/
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read_lock_irqsave(&octeon_irq_ciu1_rwlock, flags);
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en1 = cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
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en1 |= 1ull << bit;
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cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1);
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cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
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read_unlock_irqrestore(&octeon_irq_ciu1_rwlock, flags);
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}
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static void octeon_irq_ciu1_disable(unsigned int irq)
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{
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int bit = irq - OCTEON_IRQ_WDOG0; /* Bit 0-63 of EN1 */
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unsigned long flags;
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uint64_t en1;
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#ifdef CONFIG_SMP
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int cpu;
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write_lock_irqsave(&octeon_irq_ciu1_rwlock, flags);
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for_each_online_cpu(cpu) {
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int coreid = cpu_logical_map(cpu);
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en1 = cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
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en1 &= ~(1ull << bit);
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cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1);
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}
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/*
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* We need to do a read after the last update to make sure all
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* of them are done.
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*/
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cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num() * 2 + 1));
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write_unlock_irqrestore(&octeon_irq_ciu1_rwlock, flags);
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#else
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int coreid = cvmx_get_core_num();
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local_irq_save(flags);
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en1 = cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
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en1 &= ~(1ull << bit);
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cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1);
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cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1));
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local_irq_restore(flags);
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#endif
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}
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#ifdef CONFIG_SMP
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static void octeon_irq_ciu1_set_affinity(unsigned int irq, const struct cpumask *dest)
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{
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int cpu;
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int bit = irq - OCTEON_IRQ_WDOG0; /* Bit 0-63 of EN1 */
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write_lock(&octeon_irq_ciu1_rwlock);
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for_each_online_cpu(cpu) {
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int coreid = cpu_logical_map(cpu);
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uint64_t en1 =
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cvmx_read_csr(CVMX_CIU_INTX_EN1
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(coreid * 2 + 1));
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if (cpumask_test_cpu(cpu, dest))
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en1 |= 1ull << bit;
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else
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en1 &= ~(1ull << bit);
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cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1);
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}
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/*
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* We need to do a read after the last update to make sure all
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* of them are done.
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*/
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cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num() * 2 + 1));
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write_unlock(&octeon_irq_ciu1_rwlock);
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}
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#endif
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static struct irq_chip octeon_irq_chip_ciu1 = {
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.name = "CIU1",
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.enable = octeon_irq_ciu1_enable,
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.disable = octeon_irq_ciu1_disable,
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.ack = octeon_irq_ciu1_ack,
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.eoi = octeon_irq_ciu1_eoi,
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#ifdef CONFIG_SMP
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.set_affinity = octeon_irq_ciu1_set_affinity,
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#endif
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};
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#ifdef CONFIG_PCI_MSI
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static void octeon_irq_msi_ack(unsigned int irq)
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{
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if (!octeon_has_feature(OCTEON_FEATURE_PCIE)) {
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/* These chips have PCI */
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cvmx_write_csr(CVMX_NPI_NPI_MSI_RCV,
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1ull << (irq - OCTEON_IRQ_MSI_BIT0));
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} else {
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/*
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* These chips have PCIe. Thankfully the ACK doesn't
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* need any locking.
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*/
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cvmx_write_csr(CVMX_PEXP_NPEI_MSI_RCV0,
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1ull << (irq - OCTEON_IRQ_MSI_BIT0));
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}
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}
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static void octeon_irq_msi_eoi(unsigned int irq)
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{
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/* Nothing needed */
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}
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static void octeon_irq_msi_enable(unsigned int irq)
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{
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if (!octeon_has_feature(OCTEON_FEATURE_PCIE)) {
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/*
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* Octeon PCI doesn't have the ability to mask/unmask
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* MSI interrupts individually. Instead of
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* masking/unmasking them in groups of 16, we simple
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* assume MSI devices are well behaved. MSI
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* interrupts are always enable and the ACK is assumed
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* to be enough.
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*/
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} else {
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/* These chips have PCIe. Note that we only support
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* the first 64 MSI interrupts. Unfortunately all the
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* MSI enables are in the same register. We use
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* MSI0's lock to control access to them all.
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*/
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uint64_t en;
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unsigned long flags;
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spin_lock_irqsave(&octeon_irq_msi_lock, flags);
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en = cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
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en |= 1ull << (irq - OCTEON_IRQ_MSI_BIT0);
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cvmx_write_csr(CVMX_PEXP_NPEI_MSI_ENB0, en);
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cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
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spin_unlock_irqrestore(&octeon_irq_msi_lock, flags);
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}
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}
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static void octeon_irq_msi_disable(unsigned int irq)
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{
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if (!octeon_has_feature(OCTEON_FEATURE_PCIE)) {
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/* See comment in enable */
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} else {
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/*
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* These chips have PCIe. Note that we only support
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* the first 64 MSI interrupts. Unfortunately all the
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* MSI enables are in the same register. We use
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* MSI0's lock to control access to them all.
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*/
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uint64_t en;
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unsigned long flags;
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spin_lock_irqsave(&octeon_irq_msi_lock, flags);
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en = cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
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en &= ~(1ull << (irq - OCTEON_IRQ_MSI_BIT0));
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cvmx_write_csr(CVMX_PEXP_NPEI_MSI_ENB0, en);
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cvmx_read_csr(CVMX_PEXP_NPEI_MSI_ENB0);
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spin_unlock_irqrestore(&octeon_irq_msi_lock, flags);
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}
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}
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static struct irq_chip octeon_irq_chip_msi = {
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.name = "MSI",
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.enable = octeon_irq_msi_enable,
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.disable = octeon_irq_msi_disable,
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.ack = octeon_irq_msi_ack,
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.eoi = octeon_irq_msi_eoi,
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};
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#endif
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void __init arch_init_irq(void)
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{
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int irq;
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#ifdef CONFIG_SMP
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/* Set the default affinity to the boot cpu. */
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cpumask_clear(irq_default_affinity);
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cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
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#endif
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if (NR_IRQS < OCTEON_IRQ_LAST)
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pr_err("octeon_irq_init: NR_IRQS is set too low\n");
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/* 0 - 15 reserved for i8259 master and slave controller. */
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/* 17 - 23 Mips internal */
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for (irq = OCTEON_IRQ_SW0; irq <= OCTEON_IRQ_TIMER; irq++) {
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set_irq_chip_and_handler(irq, &octeon_irq_chip_core,
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handle_percpu_irq);
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}
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/* 24 - 87 CIU_INT_SUM0 */
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for (irq = OCTEON_IRQ_WORKQ0; irq <= OCTEON_IRQ_BOOTDMA; irq++) {
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set_irq_chip_and_handler(irq, &octeon_irq_chip_ciu0,
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handle_percpu_irq);
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}
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/* 88 - 151 CIU_INT_SUM1 */
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for (irq = OCTEON_IRQ_WDOG0; irq <= OCTEON_IRQ_RESERVED151; irq++) {
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set_irq_chip_and_handler(irq, &octeon_irq_chip_ciu1,
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handle_percpu_irq);
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}
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#ifdef CONFIG_PCI_MSI
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/* 152 - 215 PCI/PCIe MSI interrupts */
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for (irq = OCTEON_IRQ_MSI_BIT0; irq <= OCTEON_IRQ_MSI_BIT63; irq++) {
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set_irq_chip_and_handler(irq, &octeon_irq_chip_msi,
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handle_percpu_irq);
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}
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#endif
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set_c0_status(0x300 << 2);
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}
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asmlinkage void plat_irq_dispatch(void)
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{
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const unsigned long core_id = cvmx_get_core_num();
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const uint64_t ciu_sum0_address = CVMX_CIU_INTX_SUM0(core_id * 2);
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const uint64_t ciu_en0_address = CVMX_CIU_INTX_EN0(core_id * 2);
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const uint64_t ciu_sum1_address = CVMX_CIU_INT_SUM1;
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const uint64_t ciu_en1_address = CVMX_CIU_INTX_EN1(core_id * 2 + 1);
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unsigned long cop0_cause;
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unsigned long cop0_status;
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uint64_t ciu_en;
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uint64_t ciu_sum;
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while (1) {
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cop0_cause = read_c0_cause();
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cop0_status = read_c0_status();
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cop0_cause &= cop0_status;
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cop0_cause &= ST0_IM;
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if (unlikely(cop0_cause & STATUSF_IP2)) {
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ciu_sum = cvmx_read_csr(ciu_sum0_address);
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ciu_en = cvmx_read_csr(ciu_en0_address);
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ciu_sum &= ciu_en;
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if (likely(ciu_sum))
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do_IRQ(fls64(ciu_sum) + OCTEON_IRQ_WORKQ0 - 1);
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else
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spurious_interrupt();
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} else if (unlikely(cop0_cause & STATUSF_IP3)) {
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ciu_sum = cvmx_read_csr(ciu_sum1_address);
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ciu_en = cvmx_read_csr(ciu_en1_address);
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ciu_sum &= ciu_en;
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if (likely(ciu_sum))
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do_IRQ(fls64(ciu_sum) + OCTEON_IRQ_WDOG0 - 1);
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else
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spurious_interrupt();
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} else if (likely(cop0_cause)) {
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do_IRQ(fls(cop0_cause) - 9 + MIPS_CPU_IRQ_BASE);
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} else {
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break;
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}
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}
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}
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