Commit | Line | Data |
---|---|---|
85f2bf9f ME |
1 | /* |
2 | * Copyright 2006 Jake Moilanen <moilanen@austin.ibm.com>, IBM Corp. | |
3 | * Copyright 2006-2007 Michael Ellerman, IBM Corp. | |
4 | * | |
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 | |
8 | * License. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/device.h> | |
13 | #include <linux/irq.h> | |
14 | #include <linux/msi.h> | |
15 | ||
16 | #include <asm/rtas.h> | |
17 | #include <asm/hw_irq.h> | |
18 | #include <asm/ppc-pci.h> | |
19 | ||
20 | static int query_token, change_token; | |
21 | ||
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 | |
27 | ||
28 | static struct pci_dn *get_pdn(struct pci_dev *pdev) | |
29 | { | |
30 | struct device_node *dn; | |
31 | struct pci_dn *pdn; | |
32 | ||
33 | dn = pci_device_to_OF_node(pdev); | |
34 | if (!dn) { | |
35 | dev_dbg(&pdev->dev, "rtas_msi: No OF device node\n"); | |
36 | return NULL; | |
37 | } | |
38 | ||
39 | pdn = PCI_DN(dn); | |
40 | if (!pdn) { | |
41 | dev_dbg(&pdev->dev, "rtas_msi: No PCI DN\n"); | |
42 | return NULL; | |
43 | } | |
44 | ||
45 | return pdn; | |
46 | } | |
47 | ||
48 | /* RTAS Helpers */ | |
49 | ||
50 | static int rtas_change_msi(struct pci_dn *pdn, u32 func, u32 num_irqs) | |
51 | { | |
52 | u32 addr, seq_num, rtas_ret[3]; | |
53 | unsigned long buid; | |
54 | int rc; | |
55 | ||
56 | addr = rtas_config_addr(pdn->busno, pdn->devfn, 0); | |
57 | buid = pdn->phb->buid; | |
58 | ||
59 | seq_num = 1; | |
60 | do { | |
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); | |
65 | else | |
66 | rc = rtas_call(change_token, 6, 3, rtas_ret, addr, | |
67 | BUID_HI(buid), BUID_LO(buid), | |
68 | func, num_irqs, seq_num); | |
69 | ||
70 | seq_num = rtas_ret[1]; | |
71 | } while (rtas_busy_delay(rc)); | |
72 | ||
d385366a | 73 | /* |
6071ed04 ME |
74 | * If the RTAS call succeeded, return the number of irqs allocated. |
75 | * If not, make sure we return a negative error code. | |
d385366a | 76 | */ |
6071ed04 ME |
77 | if (rc == 0) |
78 | rc = rtas_ret[0]; | |
79 | else if (rc > 0) | |
80 | rc = -rc; | |
85f2bf9f | 81 | |
d385366a ME |
82 | pr_debug("rtas_msi: ibm,change_msi(func=%d,num=%d), got %d rc = %d\n", |
83 | func, num_irqs, rtas_ret[0], rc); | |
85f2bf9f ME |
84 | |
85 | return rc; | |
86 | } | |
87 | ||
88 | static void rtas_disable_msi(struct pci_dev *pdev) | |
89 | { | |
90 | struct pci_dn *pdn; | |
91 | ||
92 | pdn = get_pdn(pdev); | |
93 | if (!pdn) | |
94 | return; | |
95 | ||
6071ed04 | 96 | if (rtas_change_msi(pdn, RTAS_CHANGE_FN, 0) != 0) |
85f2bf9f ME |
97 | pr_debug("rtas_msi: Setting MSIs to 0 failed!\n"); |
98 | } | |
99 | ||
100 | static int rtas_query_irq_number(struct pci_dn *pdn, int offset) | |
101 | { | |
102 | u32 addr, rtas_ret[2]; | |
103 | unsigned long buid; | |
104 | int rc; | |
105 | ||
106 | addr = rtas_config_addr(pdn->busno, pdn->devfn, 0); | |
107 | buid = pdn->phb->buid; | |
108 | ||
109 | do { | |
110 | rc = rtas_call(query_token, 4, 3, rtas_ret, addr, | |
111 | BUID_HI(buid), BUID_LO(buid), offset); | |
112 | } while (rtas_busy_delay(rc)); | |
113 | ||
114 | if (rc) { | |
115 | pr_debug("rtas_msi: error (%d) querying source number\n", rc); | |
116 | return rc; | |
117 | } | |
118 | ||
119 | return rtas_ret[0]; | |
120 | } | |
121 | ||
122 | static void rtas_teardown_msi_irqs(struct pci_dev *pdev) | |
123 | { | |
124 | struct msi_desc *entry; | |
125 | ||
126 | list_for_each_entry(entry, &pdev->msi_list, list) { | |
127 | if (entry->irq == NO_IRQ) | |
128 | continue; | |
129 | ||
130 | set_irq_msi(entry->irq, NULL); | |
131 | irq_dispose_mapping(entry->irq); | |
132 | } | |
133 | ||
134 | rtas_disable_msi(pdev); | |
135 | } | |
136 | ||
3a51c0cb | 137 | static int check_req(struct pci_dev *pdev, int nvec, char *prop_name) |
85f2bf9f ME |
138 | { |
139 | struct device_node *dn; | |
140 | struct pci_dn *pdn; | |
141 | const u32 *req_msi; | |
142 | ||
143 | pdn = get_pdn(pdev); | |
144 | if (!pdn) | |
145 | return -ENODEV; | |
146 | ||
147 | dn = pdn->node; | |
148 | ||
3a51c0cb | 149 | req_msi = of_get_property(dn, prop_name, NULL); |
85f2bf9f | 150 | if (!req_msi) { |
3a51c0cb | 151 | pr_debug("rtas_msi: No %s on %s\n", prop_name, dn->full_name); |
85f2bf9f ME |
152 | return -ENOENT; |
153 | } | |
154 | ||
155 | if (*req_msi < nvec) { | |
3a51c0cb | 156 | pr_debug("rtas_msi: %s requests < %d MSIs\n", prop_name, nvec); |
d523cc37 ME |
157 | |
158 | if (*req_msi == 0) /* Be paranoid */ | |
159 | return -ENOSPC; | |
160 | ||
161 | return *req_msi; | |
85f2bf9f ME |
162 | } |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
3a51c0cb ME |
167 | static int check_req_msi(struct pci_dev *pdev, int nvec) |
168 | { | |
169 | return check_req(pdev, nvec, "ibm,req#msi"); | |
170 | } | |
171 | ||
172 | static int check_req_msix(struct pci_dev *pdev, int nvec) | |
173 | { | |
174 | return check_req(pdev, nvec, "ibm,req#msi-x"); | |
175 | } | |
176 | ||
85f2bf9f ME |
177 | static int rtas_msi_check_device(struct pci_dev *pdev, int nvec, int type) |
178 | { | |
179 | if (type == PCI_CAP_ID_MSIX) | |
3a51c0cb | 180 | return check_req_msix(pdev, nvec); |
85f2bf9f ME |
181 | |
182 | return check_req_msi(pdev, nvec); | |
183 | } | |
184 | ||
185 | static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) | |
186 | { | |
187 | struct pci_dn *pdn; | |
188 | int hwirq, virq, i, rc; | |
189 | struct msi_desc *entry; | |
1db3e890 | 190 | struct msi_msg msg; |
85f2bf9f ME |
191 | |
192 | pdn = get_pdn(pdev); | |
193 | if (!pdn) | |
194 | return -ENODEV; | |
195 | ||
196 | /* | |
197 | * Try the new more explicit firmware interface, if that fails fall | |
198 | * back to the old interface. The old interface is known to never | |
199 | * return MSI-Xs. | |
200 | */ | |
201 | if (type == PCI_CAP_ID_MSI) { | |
202 | rc = rtas_change_msi(pdn, RTAS_CHANGE_MSI_FN, nvec); | |
203 | ||
6071ed04 | 204 | if (rc < 0) { |
85f2bf9f ME |
205 | pr_debug("rtas_msi: trying the old firmware call.\n"); |
206 | rc = rtas_change_msi(pdn, RTAS_CHANGE_FN, nvec); | |
207 | } | |
208 | } else | |
209 | rc = rtas_change_msi(pdn, RTAS_CHANGE_MSIX_FN, nvec); | |
210 | ||
6071ed04 | 211 | if (rc != nvec) { |
85f2bf9f | 212 | pr_debug("rtas_msi: rtas_change_msi() failed\n"); |
fcbe8090 | 213 | return rc; |
85f2bf9f ME |
214 | } |
215 | ||
216 | i = 0; | |
217 | list_for_each_entry(entry, &pdev->msi_list, list) { | |
e27ed698 | 218 | hwirq = rtas_query_irq_number(pdn, i++); |
85f2bf9f | 219 | if (hwirq < 0) { |
85f2bf9f | 220 | pr_debug("rtas_msi: error (%d) getting hwirq\n", rc); |
fcbe8090 | 221 | return hwirq; |
85f2bf9f ME |
222 | } |
223 | ||
224 | virq = irq_create_mapping(NULL, hwirq); | |
225 | ||
226 | if (virq == NO_IRQ) { | |
227 | pr_debug("rtas_msi: Failed mapping hwirq %d\n", hwirq); | |
fcbe8090 | 228 | return -ENOSPC; |
85f2bf9f ME |
229 | } |
230 | ||
231 | dev_dbg(&pdev->dev, "rtas_msi: allocated virq %d\n", virq); | |
232 | set_irq_msi(virq, entry); | |
1db3e890 ME |
233 | |
234 | /* Read config space back so we can restore after reset */ | |
235 | read_msi_msg(virq, &msg); | |
236 | entry->msg = msg; | |
237 | ||
85f2bf9f ME |
238 | unmask_msi_irq(virq); |
239 | } | |
240 | ||
241 | return 0; | |
85f2bf9f ME |
242 | } |
243 | ||
244 | static void rtas_msi_pci_irq_fixup(struct pci_dev *pdev) | |
245 | { | |
246 | /* No LSI -> leave MSIs (if any) configured */ | |
247 | if (pdev->irq == NO_IRQ) { | |
248 | dev_dbg(&pdev->dev, "rtas_msi: no LSI, nothing to do.\n"); | |
249 | return; | |
250 | } | |
251 | ||
252 | /* No MSI -> MSIs can't have been assigned by fw, leave LSI */ | |
649781f8 ME |
253 | if (check_req_msi(pdev, 1) && check_req_msix(pdev, 1)) { |
254 | dev_dbg(&pdev->dev, "rtas_msi: no req#msi/x, nothing to do.\n"); | |
85f2bf9f ME |
255 | return; |
256 | } | |
257 | ||
258 | dev_dbg(&pdev->dev, "rtas_msi: disabling existing MSI.\n"); | |
259 | rtas_disable_msi(pdev); | |
260 | } | |
261 | ||
262 | static int rtas_msi_init(void) | |
263 | { | |
264 | query_token = rtas_token("ibm,query-interrupt-source-number"); | |
265 | change_token = rtas_token("ibm,change-msi"); | |
266 | ||
267 | if ((query_token == RTAS_UNKNOWN_SERVICE) || | |
268 | (change_token == RTAS_UNKNOWN_SERVICE)) { | |
269 | pr_debug("rtas_msi: no RTAS tokens, no MSI support.\n"); | |
270 | return -1; | |
271 | } | |
272 | ||
273 | pr_debug("rtas_msi: Registering RTAS MSI callbacks.\n"); | |
274 | ||
275 | WARN_ON(ppc_md.setup_msi_irqs); | |
276 | ppc_md.setup_msi_irqs = rtas_setup_msi_irqs; | |
277 | ppc_md.teardown_msi_irqs = rtas_teardown_msi_irqs; | |
278 | ppc_md.msi_check_device = rtas_msi_check_device; | |
279 | ||
280 | WARN_ON(ppc_md.pci_irq_fixup); | |
281 | ppc_md.pci_irq_fixup = rtas_msi_pci_irq_fixup; | |
282 | ||
283 | return 0; | |
284 | } | |
285 | arch_initcall(rtas_msi_init); |