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240 lines
6.0 KiB
240 lines
6.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/irq.h> |
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#include <linux/smp.h> |
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#include <linux/interrupt.h> |
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#include <linux/init.h> |
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#include <linux/cpu.h> |
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#include <linux/of.h> |
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#include <linux/spinlock.h> |
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#include <linux/msi.h> |
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#include <asm/prom.h> |
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#include <asm/smp.h> |
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#include <asm/machdep.h> |
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#include <asm/irq.h> |
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#include <asm/errno.h> |
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#include <asm/xics.h> |
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#include <asm/rtas.h> |
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/* RTAS service tokens */ |
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static int ibm_get_xive; |
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static int ibm_set_xive; |
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static int ibm_int_on; |
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static int ibm_int_off; |
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static int ics_rtas_map(struct ics *ics, unsigned int virq); |
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static void ics_rtas_mask_unknown(struct ics *ics, unsigned long vec); |
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static long ics_rtas_get_server(struct ics *ics, unsigned long vec); |
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static int ics_rtas_host_match(struct ics *ics, struct device_node *node); |
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/* Only one global & state struct ics */ |
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static struct ics ics_rtas = { |
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.map = ics_rtas_map, |
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.mask_unknown = ics_rtas_mask_unknown, |
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.get_server = ics_rtas_get_server, |
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.host_match = ics_rtas_host_match, |
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}; |
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static void ics_rtas_unmask_irq(struct irq_data *d) |
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{ |
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unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d); |
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int call_status; |
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int server; |
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pr_devel("xics: unmask virq %d [hw 0x%x]\n", d->irq, hw_irq); |
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if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS) |
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return; |
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server = xics_get_irq_server(d->irq, irq_data_get_affinity_mask(d), 0); |
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call_status = rtas_call_reentrant(ibm_set_xive, 3, 1, NULL, hw_irq, |
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server, DEFAULT_PRIORITY); |
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if (call_status != 0) { |
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printk(KERN_ERR |
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"%s: ibm_set_xive irq %u server %x returned %d\n", |
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__func__, hw_irq, server, call_status); |
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return; |
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} |
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/* Now unmask the interrupt (often a no-op) */ |
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call_status = rtas_call_reentrant(ibm_int_on, 1, 1, NULL, hw_irq); |
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if (call_status != 0) { |
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printk(KERN_ERR "%s: ibm_int_on irq=%u returned %d\n", |
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__func__, hw_irq, call_status); |
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return; |
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} |
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} |
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static unsigned int ics_rtas_startup(struct irq_data *d) |
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{ |
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#ifdef CONFIG_PCI_MSI |
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/* |
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* The generic MSI code returns with the interrupt disabled on the |
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* card, using the MSI mask bits. Firmware doesn't appear to unmask |
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* at that level, so we do it here by hand. |
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*/ |
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if (irq_data_get_msi_desc(d)) |
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pci_msi_unmask_irq(d); |
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#endif |
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/* unmask it */ |
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ics_rtas_unmask_irq(d); |
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return 0; |
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} |
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static void ics_rtas_mask_real_irq(unsigned int hw_irq) |
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{ |
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int call_status; |
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if (hw_irq == XICS_IPI) |
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return; |
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call_status = rtas_call_reentrant(ibm_int_off, 1, 1, NULL, hw_irq); |
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if (call_status != 0) { |
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printk(KERN_ERR "%s: ibm_int_off irq=%u returned %d\n", |
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__func__, hw_irq, call_status); |
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return; |
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} |
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/* Have to set XIVE to 0xff to be able to remove a slot */ |
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call_status = rtas_call_reentrant(ibm_set_xive, 3, 1, NULL, hw_irq, |
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xics_default_server, 0xff); |
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if (call_status != 0) { |
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printk(KERN_ERR "%s: ibm_set_xive(0xff) irq=%u returned %d\n", |
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__func__, hw_irq, call_status); |
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return; |
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} |
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} |
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static void ics_rtas_mask_irq(struct irq_data *d) |
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{ |
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unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d); |
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pr_devel("xics: mask virq %d [hw 0x%x]\n", d->irq, hw_irq); |
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if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS) |
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return; |
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ics_rtas_mask_real_irq(hw_irq); |
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} |
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static int ics_rtas_set_affinity(struct irq_data *d, |
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const struct cpumask *cpumask, |
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bool force) |
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{ |
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unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d); |
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int status; |
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int xics_status[2]; |
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int irq_server; |
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if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS) |
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return -1; |
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status = rtas_call_reentrant(ibm_get_xive, 1, 3, xics_status, hw_irq); |
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if (status) { |
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printk(KERN_ERR "%s: ibm,get-xive irq=%u returns %d\n", |
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__func__, hw_irq, status); |
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return -1; |
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} |
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irq_server = xics_get_irq_server(d->irq, cpumask, 1); |
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if (irq_server == -1) { |
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pr_warn("%s: No online cpus in the mask %*pb for irq %d\n", |
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__func__, cpumask_pr_args(cpumask), d->irq); |
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return -1; |
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} |
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status = rtas_call_reentrant(ibm_set_xive, 3, 1, NULL, |
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hw_irq, irq_server, xics_status[1]); |
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if (status) { |
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printk(KERN_ERR "%s: ibm,set-xive irq=%u returns %d\n", |
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__func__, hw_irq, status); |
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return -1; |
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} |
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return IRQ_SET_MASK_OK; |
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} |
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static struct irq_chip ics_rtas_irq_chip = { |
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.name = "XICS", |
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.irq_startup = ics_rtas_startup, |
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.irq_mask = ics_rtas_mask_irq, |
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.irq_unmask = ics_rtas_unmask_irq, |
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.irq_eoi = NULL, /* Patched at init time */ |
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.irq_set_affinity = ics_rtas_set_affinity, |
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.irq_set_type = xics_set_irq_type, |
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.irq_retrigger = xics_retrigger, |
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}; |
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static int ics_rtas_map(struct ics *ics, unsigned int virq) |
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{ |
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unsigned int hw_irq = (unsigned int)virq_to_hw(virq); |
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int status[2]; |
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int rc; |
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if (WARN_ON(hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)) |
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return -EINVAL; |
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/* Check if RTAS knows about this interrupt */ |
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rc = rtas_call_reentrant(ibm_get_xive, 1, 3, status, hw_irq); |
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if (rc) |
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return -ENXIO; |
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irq_set_chip_and_handler(virq, &ics_rtas_irq_chip, handle_fasteoi_irq); |
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irq_set_chip_data(virq, &ics_rtas); |
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return 0; |
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} |
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static void ics_rtas_mask_unknown(struct ics *ics, unsigned long vec) |
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{ |
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ics_rtas_mask_real_irq(vec); |
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} |
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static long ics_rtas_get_server(struct ics *ics, unsigned long vec) |
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{ |
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int rc, status[2]; |
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rc = rtas_call_reentrant(ibm_get_xive, 1, 3, status, vec); |
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if (rc) |
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return -1; |
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return status[0]; |
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} |
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static int ics_rtas_host_match(struct ics *ics, struct device_node *node) |
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{ |
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/* IBM machines have interrupt parents of various funky types for things |
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* like vdevices, events, etc... The trick we use here is to match |
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* everything here except the legacy 8259 which is compatible "chrp,iic" |
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*/ |
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return !of_device_is_compatible(node, "chrp,iic"); |
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} |
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__init int ics_rtas_init(void) |
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{ |
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ibm_get_xive = rtas_token("ibm,get-xive"); |
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ibm_set_xive = rtas_token("ibm,set-xive"); |
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ibm_int_on = rtas_token("ibm,int-on"); |
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ibm_int_off = rtas_token("ibm,int-off"); |
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/* We enable the RTAS "ICS" if RTAS is present with the |
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* appropriate tokens |
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*/ |
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if (ibm_get_xive == RTAS_UNKNOWN_SERVICE || |
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ibm_set_xive == RTAS_UNKNOWN_SERVICE) |
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return -ENODEV; |
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/* We need to patch our irq chip's EOI to point to the |
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* right ICP |
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*/ |
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ics_rtas_irq_chip.irq_eoi = icp_ops->eoi; |
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/* Register ourselves */ |
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xics_register_ics(&ics_rtas); |
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return 0; |
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} |
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