1#include <linux/types.h>
  2#include <linux/kernel.h>
  3#include <linux/irq.h>
  4#include <linux/smp.h>
  5#include <linux/interrupt.h>
  6#include <linux/init.h>
  7#include <linux/cpu.h>
  8#include <linux/of.h>
  9#include <linux/spinlock.h>
 10#include <linux/msi.h>
 11
 12#include <asm/prom.h>
 13#include <asm/smp.h>
 14#include <asm/machdep.h>
 15#include <asm/irq.h>
 16#include <asm/errno.h>
 17#include <asm/xics.h>
 18#include <asm/rtas.h>
 19
 20/* RTAS service tokens */
 21static int ibm_get_xive;
 22static int ibm_set_xive;
 23static int ibm_int_on;
 24static int ibm_int_off;
 25
 26static int ics_rtas_map(struct ics *ics, unsigned int virq);
 27static void ics_rtas_mask_unknown(struct ics *ics, unsigned long vec);
 28static long ics_rtas_get_server(struct ics *ics, unsigned long vec);
 29static int ics_rtas_host_match(struct ics *ics, struct device_node *node);
 30
 31/* Only one global & state struct ics */
 32static struct ics ics_rtas = {
 33	.map		= ics_rtas_map,
 34	.mask_unknown	= ics_rtas_mask_unknown,
 35	.get_server	= ics_rtas_get_server,
 36	.host_match	= ics_rtas_host_match,
 37};
 38
 39static void ics_rtas_unmask_irq(struct irq_data *d)
 40{
 41	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
 42	int call_status;
 43	int server;
 44
 45	pr_devel("xics: unmask virq %d [hw 0x%x]\n", d->irq, hw_irq);
 46
 47	if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)
 48		return;
 49
 50	server = xics_get_irq_server(d->irq, d->affinity, 0);
 51
 52	call_status = rtas_call(ibm_set_xive, 3, 1, NULL, hw_irq, server,
 53				DEFAULT_PRIORITY);
 54	if (call_status != 0) {
 55		printk(KERN_ERR
 56			"%s: ibm_set_xive irq %u server %x returned %d\n",
 57			__func__, hw_irq, server, call_status);
 58		return;
 59	}
 60
 61	/* Now unmask the interrupt (often a no-op) */
 62	call_status = rtas_call(ibm_int_on, 1, 1, NULL, hw_irq);
 63	if (call_status != 0) {
 64		printk(KERN_ERR "%s: ibm_int_on irq=%u returned %d\n",
 65			__func__, hw_irq, call_status);
 66		return;
 67	}
 68}
 69
 70static unsigned int ics_rtas_startup(struct irq_data *d)
 71{
 72#ifdef CONFIG_PCI_MSI
 73	/*
 74	 * The generic MSI code returns with the interrupt disabled on the
 75	 * card, using the MSI mask bits. Firmware doesn't appear to unmask
 76	 * at that level, so we do it here by hand.
 77	 */
 78	if (d->msi_desc)
 79		unmask_msi_irq(d);
 80#endif
 81	/* unmask it */
 82	ics_rtas_unmask_irq(d);
 83	return 0;
 84}
 85
 86static void ics_rtas_mask_real_irq(unsigned int hw_irq)
 87{
 88	int call_status;
 89
 90	if (hw_irq == XICS_IPI)
 91		return;
 92
 93	call_status = rtas_call(ibm_int_off, 1, 1, NULL, hw_irq);
 94	if (call_status != 0) {
 95		printk(KERN_ERR "%s: ibm_int_off irq=%u returned %d\n",
 96			__func__, hw_irq, call_status);
 97		return;
 98	}
 99
100	/* Have to set XIVE to 0xff to be able to remove a slot */
101	call_status = rtas_call(ibm_set_xive, 3, 1, NULL, hw_irq,
102				xics_default_server, 0xff);
103	if (call_status != 0) {
104		printk(KERN_ERR "%s: ibm_set_xive(0xff) irq=%u returned %d\n",
105			__func__, hw_irq, call_status);
106		return;
107	}
108}
109
110static void ics_rtas_mask_irq(struct irq_data *d)
111{
112	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
113
114	pr_devel("xics: mask virq %d [hw 0x%x]\n", d->irq, hw_irq);
115
116	if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)
117		return;
118	ics_rtas_mask_real_irq(hw_irq);
119}
120
121static int ics_rtas_set_affinity(struct irq_data *d,
122				 const struct cpumask *cpumask,
123				 bool force)
124{
125	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
126	int status;
127	int xics_status[2];
128	int irq_server;
129
130	if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)
131		return -1;
132
133	status = rtas_call(ibm_get_xive, 1, 3, xics_status, hw_irq);
134
135	if (status) {
136		printk(KERN_ERR "%s: ibm,get-xive irq=%u returns %d\n",
137			__func__, hw_irq, status);
138		return -1;
139	}
140
141	irq_server = xics_get_irq_server(d->irq, cpumask, 1);
142	if (irq_server == -1) {
143		char cpulist[128];
144		cpumask_scnprintf(cpulist, sizeof(cpulist), cpumask);
145		printk(KERN_WARNING
146			"%s: No online cpus in the mask %s for irq %d\n",
147			__func__, cpulist, d->irq);
148		return -1;
149	}
150
151	status = rtas_call(ibm_set_xive, 3, 1, NULL,
152			   hw_irq, irq_server, xics_status[1]);
153
154	if (status) {
155		printk(KERN_ERR "%s: ibm,set-xive irq=%u returns %d\n",
156			__func__, hw_irq, status);
157		return -1;
158	}
159
160	return IRQ_SET_MASK_OK;
161}
162
163static struct irq_chip ics_rtas_irq_chip = {
164	.name = "XICS",
165	.irq_startup = ics_rtas_startup,
166	.irq_mask = ics_rtas_mask_irq,
167	.irq_unmask = ics_rtas_unmask_irq,
168	.irq_eoi = NULL, /* Patched at init time */
169	.irq_set_affinity = ics_rtas_set_affinity
 
 
170};
171
172static int ics_rtas_map(struct ics *ics, unsigned int virq)
173{
174	unsigned int hw_irq = (unsigned int)virq_to_hw(virq);
175	int status[2];
176	int rc;
177
178	if (WARN_ON(hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS))
179		return -EINVAL;
180
181	/* Check if RTAS knows about this interrupt */
182	rc = rtas_call(ibm_get_xive, 1, 3, status, hw_irq);
183	if (rc)
184		return -ENXIO;
185
186	irq_set_chip_and_handler(virq, &ics_rtas_irq_chip, handle_fasteoi_irq);
187	irq_set_chip_data(virq, &ics_rtas);
188
189	return 0;
190}
191
192static void ics_rtas_mask_unknown(struct ics *ics, unsigned long vec)
193{
194	ics_rtas_mask_real_irq(vec);
195}
196
197static long ics_rtas_get_server(struct ics *ics, unsigned long vec)
198{
199	int rc, status[2];
200
201	rc = rtas_call(ibm_get_xive, 1, 3, status, vec);
202	if (rc)
203		return -1;
204	return status[0];
205}
206
207static int ics_rtas_host_match(struct ics *ics, struct device_node *node)
208{
209	/* IBM machines have interrupt parents of various funky types for things
210	 * like vdevices, events, etc... The trick we use here is to match
211	 * everything here except the legacy 8259 which is compatible "chrp,iic"
212	 */
213	return !of_device_is_compatible(node, "chrp,iic");
214}
215
216int ics_rtas_init(void)
217{
218	ibm_get_xive = rtas_token("ibm,get-xive");
219	ibm_set_xive = rtas_token("ibm,set-xive");
220	ibm_int_on  = rtas_token("ibm,int-on");
221	ibm_int_off = rtas_token("ibm,int-off");
222
223	/* We enable the RTAS "ICS" if RTAS is present with the
224	 * appropriate tokens
225	 */
226	if (ibm_get_xive == RTAS_UNKNOWN_SERVICE ||
227	    ibm_set_xive == RTAS_UNKNOWN_SERVICE)
228		return -ENODEV;
229
230	/* We need to patch our irq chip's EOI to point to the
231	 * right ICP
232	 */
233	ics_rtas_irq_chip.irq_eoi = icp_ops->eoi;
234
235	/* Register ourselves */
236	xics_register_ics(&ics_rtas);
237
238	return 0;
239}
240

  1#include <linux/types.h>
  2#include <linux/kernel.h>
  3#include <linux/irq.h>
  4#include <linux/smp.h>
  5#include <linux/interrupt.h>
  6#include <linux/init.h>
  7#include <linux/cpu.h>
  8#include <linux/of.h>
  9#include <linux/spinlock.h>
 10#include <linux/msi.h>
 11
 12#include <asm/prom.h>
 13#include <asm/smp.h>
 14#include <asm/machdep.h>
 15#include <asm/irq.h>
 16#include <asm/errno.h>
 17#include <asm/xics.h>
 18#include <asm/rtas.h>
 19
 20/* RTAS service tokens */
 21static int ibm_get_xive;
 22static int ibm_set_xive;
 23static int ibm_int_on;
 24static int ibm_int_off;
 25
 26static int ics_rtas_map(struct ics *ics, unsigned int virq);
 27static void ics_rtas_mask_unknown(struct ics *ics, unsigned long vec);
 28static long ics_rtas_get_server(struct ics *ics, unsigned long vec);
 29static int ics_rtas_host_match(struct ics *ics, struct device_node *node);
 30
 31/* Only one global & state struct ics */
 32static struct ics ics_rtas = {
 33	.map		= ics_rtas_map,
 34	.mask_unknown	= ics_rtas_mask_unknown,
 35	.get_server	= ics_rtas_get_server,
 36	.host_match	= ics_rtas_host_match,
 37};
 38
 39static void ics_rtas_unmask_irq(struct irq_data *d)
 40{
 41	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
 42	int call_status;
 43	int server;
 44
 45	pr_devel("xics: unmask virq %d [hw 0x%x]\n", d->irq, hw_irq);
 46
 47	if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)
 48		return;
 49
 50	server = xics_get_irq_server(d->irq, irq_data_get_affinity_mask(d), 0);
 51
 52	call_status = rtas_call(ibm_set_xive, 3, 1, NULL, hw_irq, server,
 53				DEFAULT_PRIORITY);
 54	if (call_status != 0) {
 55		printk(KERN_ERR
 56			"%s: ibm_set_xive irq %u server %x returned %d\n",
 57			__func__, hw_irq, server, call_status);
 58		return;
 59	}
 60
 61	/* Now unmask the interrupt (often a no-op) */
 62	call_status = rtas_call(ibm_int_on, 1, 1, NULL, hw_irq);
 63	if (call_status != 0) {
 64		printk(KERN_ERR "%s: ibm_int_on irq=%u returned %d\n",
 65			__func__, hw_irq, call_status);
 66		return;
 67	}
 68}
 69
 70static unsigned int ics_rtas_startup(struct irq_data *d)
 71{
 72#ifdef CONFIG_PCI_MSI
 73	/*
 74	 * The generic MSI code returns with the interrupt disabled on the
 75	 * card, using the MSI mask bits. Firmware doesn't appear to unmask
 76	 * at that level, so we do it here by hand.
 77	 */
 78	if (irq_data_get_msi_desc(d))
 79		pci_msi_unmask_irq(d);
 80#endif
 81	/* unmask it */
 82	ics_rtas_unmask_irq(d);
 83	return 0;
 84}
 85
 86static void ics_rtas_mask_real_irq(unsigned int hw_irq)
 87{
 88	int call_status;
 89
 90	if (hw_irq == XICS_IPI)
 91		return;
 92
 93	call_status = rtas_call(ibm_int_off, 1, 1, NULL, hw_irq);
 94	if (call_status != 0) {
 95		printk(KERN_ERR "%s: ibm_int_off irq=%u returned %d\n",
 96			__func__, hw_irq, call_status);
 97		return;
 98	}
 99
100	/* Have to set XIVE to 0xff to be able to remove a slot */
101	call_status = rtas_call(ibm_set_xive, 3, 1, NULL, hw_irq,
102				xics_default_server, 0xff);
103	if (call_status != 0) {
104		printk(KERN_ERR "%s: ibm_set_xive(0xff) irq=%u returned %d\n",
105			__func__, hw_irq, call_status);
106		return;
107	}
108}
109
110static void ics_rtas_mask_irq(struct irq_data *d)
111{
112	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
113
114	pr_devel("xics: mask virq %d [hw 0x%x]\n", d->irq, hw_irq);
115
116	if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)
117		return;
118	ics_rtas_mask_real_irq(hw_irq);
119}
120
121static int ics_rtas_set_affinity(struct irq_data *d,
122				 const struct cpumask *cpumask,
123				 bool force)
124{
125	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
126	int status;
127	int xics_status[2];
128	int irq_server;
129
130	if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)
131		return -1;
132
133	status = rtas_call(ibm_get_xive, 1, 3, xics_status, hw_irq);
134
135	if (status) {
136		printk(KERN_ERR "%s: ibm,get-xive irq=%u returns %d\n",
137			__func__, hw_irq, status);
138		return -1;
139	}
140
141	irq_server = xics_get_irq_server(d->irq, cpumask, 1);
142	if (irq_server == -1) {
143		pr_warning("%s: No online cpus in the mask %*pb for irq %d\n",
144			   __func__, cpumask_pr_args(cpumask), d->irq);
 
 
 
145		return -1;
146	}
147
148	status = rtas_call(ibm_set_xive, 3, 1, NULL,
149			   hw_irq, irq_server, xics_status[1]);
150
151	if (status) {
152		printk(KERN_ERR "%s: ibm,set-xive irq=%u returns %d\n",
153			__func__, hw_irq, status);
154		return -1;
155	}
156
157	return IRQ_SET_MASK_OK;
158}
159
160static struct irq_chip ics_rtas_irq_chip = {
161	.name = "XICS",
162	.irq_startup = ics_rtas_startup,
163	.irq_mask = ics_rtas_mask_irq,
164	.irq_unmask = ics_rtas_unmask_irq,
165	.irq_eoi = NULL, /* Patched at init time */
166	.irq_set_affinity = ics_rtas_set_affinity,
167	.irq_set_type = xics_set_irq_type,
168	.irq_retrigger = xics_retrigger,
169};
170
171static int ics_rtas_map(struct ics *ics, unsigned int virq)
172{
173	unsigned int hw_irq = (unsigned int)virq_to_hw(virq);
174	int status[2];
175	int rc;
176
177	if (WARN_ON(hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS))
178		return -EINVAL;
179
180	/* Check if RTAS knows about this interrupt */
181	rc = rtas_call(ibm_get_xive, 1, 3, status, hw_irq);
182	if (rc)
183		return -ENXIO;
184
185	irq_set_chip_and_handler(virq, &ics_rtas_irq_chip, handle_fasteoi_irq);
186	irq_set_chip_data(virq, &ics_rtas);
187
188	return 0;
189}
190
191static void ics_rtas_mask_unknown(struct ics *ics, unsigned long vec)
192{
193	ics_rtas_mask_real_irq(vec);
194}
195
196static long ics_rtas_get_server(struct ics *ics, unsigned long vec)
197{
198	int rc, status[2];
199
200	rc = rtas_call(ibm_get_xive, 1, 3, status, vec);
201	if (rc)
202		return -1;
203	return status[0];
204}
205
206static int ics_rtas_host_match(struct ics *ics, struct device_node *node)
207{
208	/* IBM machines have interrupt parents of various funky types for things
209	 * like vdevices, events, etc... The trick we use here is to match
210	 * everything here except the legacy 8259 which is compatible "chrp,iic"
211	 */
212	return !of_device_is_compatible(node, "chrp,iic");
213}
214
215__init int ics_rtas_init(void)
216{
217	ibm_get_xive = rtas_token("ibm,get-xive");
218	ibm_set_xive = rtas_token("ibm,set-xive");
219	ibm_int_on  = rtas_token("ibm,int-on");
220	ibm_int_off = rtas_token("ibm,int-off");
221
222	/* We enable the RTAS "ICS" if RTAS is present with the
223	 * appropriate tokens
224	 */
225	if (ibm_get_xive == RTAS_UNKNOWN_SERVICE ||
226	    ibm_set_xive == RTAS_UNKNOWN_SERVICE)
227		return -ENODEV;
228
229	/* We need to patch our irq chip's EOI to point to the
230	 * right ICP
231	 */
232	ics_rtas_irq_chip.irq_eoi = icp_ops->eoi;
233
234	/* Register ourselves */
235	xics_register_ics(&ics_rtas);
236
237	return 0;
238}
239