2 * Copyright 2006 Jake Moilanen <moilanen@austin.ibm.com>, IBM Corp.
3 * Copyright 2006-2007 Michael Ellerman, IBM Corp.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; version 2 of the
12 #include <linux/device.h>
13 #include <linux/irq.h>
14 #include <linux/msi.h>
17 #include <asm/hw_irq.h>
18 #include <asm/ppc-pci.h>
20 static int query_token
, change_token
;
22 #define RTAS_QUERY_FN 0
23 #define RTAS_CHANGE_FN 1
24 #define RTAS_RESET_FN 2
25 #define RTAS_CHANGE_MSI_FN 3
26 #define RTAS_CHANGE_MSIX_FN 4
28 static struct pci_dn
*get_pdn(struct pci_dev
*pdev
)
30 struct device_node
*dn
;
33 dn
= pci_device_to_OF_node(pdev
);
35 dev_dbg(&pdev
->dev
, "rtas_msi: No OF device node\n");
41 dev_dbg(&pdev
->dev
, "rtas_msi: No PCI DN\n");
50 static int rtas_change_msi(struct pci_dn
*pdn
, u32 func
, u32 num_irqs
)
52 u32 addr
, seq_num
, rtas_ret
[3];
56 addr
= rtas_config_addr(pdn
->busno
, pdn
->devfn
, 0);
57 buid
= pdn
->phb
->buid
;
61 if (func
== RTAS_CHANGE_MSI_FN
|| func
== RTAS_CHANGE_MSIX_FN
)
62 rc
= rtas_call(change_token
, 6, 4, rtas_ret
, addr
,
63 BUID_HI(buid
), BUID_LO(buid
),
64 func
, num_irqs
, seq_num
);
66 rc
= rtas_call(change_token
, 6, 3, rtas_ret
, addr
,
67 BUID_HI(buid
), BUID_LO(buid
),
68 func
, num_irqs
, seq_num
);
70 seq_num
= rtas_ret
[1];
71 } while (rtas_busy_delay(rc
));
73 if (rc
== 0) /* Success */
76 pr_debug("rtas_msi: ibm,change_msi(func=%d,num=%d) = (%d)\n",
82 static void rtas_disable_msi(struct pci_dev
*pdev
)
90 if (rtas_change_msi(pdn
, RTAS_CHANGE_FN
, 0) != 0)
91 pr_debug("rtas_msi: Setting MSIs to 0 failed!\n");
94 static int rtas_query_irq_number(struct pci_dn
*pdn
, int offset
)
96 u32 addr
, rtas_ret
[2];
100 addr
= rtas_config_addr(pdn
->busno
, pdn
->devfn
, 0);
101 buid
= pdn
->phb
->buid
;
104 rc
= rtas_call(query_token
, 4, 3, rtas_ret
, addr
,
105 BUID_HI(buid
), BUID_LO(buid
), offset
);
106 } while (rtas_busy_delay(rc
));
109 pr_debug("rtas_msi: error (%d) querying source number\n", rc
);
116 static void rtas_teardown_msi_irqs(struct pci_dev
*pdev
)
118 struct msi_desc
*entry
;
120 list_for_each_entry(entry
, &pdev
->msi_list
, list
) {
121 if (entry
->irq
== NO_IRQ
)
124 set_irq_msi(entry
->irq
, NULL
);
125 irq_dispose_mapping(entry
->irq
);
128 rtas_disable_msi(pdev
);
131 static int check_req_msi(struct pci_dev
*pdev
, int nvec
)
133 struct device_node
*dn
;
143 req_msi
= of_get_property(dn
, "ibm,req#msi", NULL
);
145 pr_debug("rtas_msi: No ibm,req#msi on %s\n", dn
->full_name
);
149 if (*req_msi
< nvec
) {
150 pr_debug("rtas_msi: ibm,req#msi requests < %d MSIs\n", nvec
);
157 static int rtas_msi_check_device(struct pci_dev
*pdev
, int nvec
, int type
)
159 if (type
== PCI_CAP_ID_MSIX
)
160 pr_debug("rtas_msi: MSI-X untested, trying anyway.\n");
162 return check_req_msi(pdev
, nvec
);
165 static int rtas_setup_msi_irqs(struct pci_dev
*pdev
, int nvec
, int type
)
168 int hwirq
, virq
, i
, rc
;
169 struct msi_desc
*entry
;
176 * Try the new more explicit firmware interface, if that fails fall
177 * back to the old interface. The old interface is known to never
180 if (type
== PCI_CAP_ID_MSI
) {
181 rc
= rtas_change_msi(pdn
, RTAS_CHANGE_MSI_FN
, nvec
);
184 pr_debug("rtas_msi: trying the old firmware call.\n");
185 rc
= rtas_change_msi(pdn
, RTAS_CHANGE_FN
, nvec
);
188 rc
= rtas_change_msi(pdn
, RTAS_CHANGE_MSIX_FN
, nvec
);
191 pr_debug("rtas_msi: rtas_change_msi() failed\n");
194 * In case of an error it's not clear whether the device is
195 * left with MSI enabled or not, so we explicitly disable.
201 list_for_each_entry(entry
, &pdev
->msi_list
, list
) {
202 hwirq
= rtas_query_irq_number(pdn
, i
);
205 pr_debug("rtas_msi: error (%d) getting hwirq\n", rc
);
209 virq
= irq_create_mapping(NULL
, hwirq
);
211 if (virq
== NO_IRQ
) {
212 pr_debug("rtas_msi: Failed mapping hwirq %d\n", hwirq
);
217 dev_dbg(&pdev
->dev
, "rtas_msi: allocated virq %d\n", virq
);
218 set_irq_msi(virq
, entry
);
219 unmask_msi_irq(virq
);
225 rtas_teardown_msi_irqs(pdev
);
229 static void rtas_msi_pci_irq_fixup(struct pci_dev
*pdev
)
231 /* No LSI -> leave MSIs (if any) configured */
232 if (pdev
->irq
== NO_IRQ
) {
233 dev_dbg(&pdev
->dev
, "rtas_msi: no LSI, nothing to do.\n");
237 /* No MSI -> MSIs can't have been assigned by fw, leave LSI */
238 if (check_req_msi(pdev
, 1)) {
239 dev_dbg(&pdev
->dev
, "rtas_msi: no req#msi, nothing to do.\n");
243 dev_dbg(&pdev
->dev
, "rtas_msi: disabling existing MSI.\n");
244 rtas_disable_msi(pdev
);
247 static int rtas_msi_init(void)
249 query_token
= rtas_token("ibm,query-interrupt-source-number");
250 change_token
= rtas_token("ibm,change-msi");
252 if ((query_token
== RTAS_UNKNOWN_SERVICE
) ||
253 (change_token
== RTAS_UNKNOWN_SERVICE
)) {
254 pr_debug("rtas_msi: no RTAS tokens, no MSI support.\n");
258 pr_debug("rtas_msi: Registering RTAS MSI callbacks.\n");
260 WARN_ON(ppc_md
.setup_msi_irqs
);
261 ppc_md
.setup_msi_irqs
= rtas_setup_msi_irqs
;
262 ppc_md
.teardown_msi_irqs
= rtas_teardown_msi_irqs
;
263 ppc_md
.msi_check_device
= rtas_msi_check_device
;
265 WARN_ON(ppc_md
.pci_irq_fixup
);
266 ppc_md
.pci_irq_fixup
= rtas_msi_pci_irq_fixup
;
270 arch_initcall(rtas_msi_init
);
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