241 lines
6.0 KiB
C
241 lines
6.0 KiB
C
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// 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(ibm_set_xive, 3, 1, NULL, hw_irq, server,
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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(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(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(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(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_warning("%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(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(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(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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