1 /* Copyright 2017 IBM Corp.
2 *
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
12 * implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define pr_fmt(fmt) "PCI-QUIRK: " fmt
18
19 #include <skiboot.h>
20 #include <pci.h>
21 #include <pci-quirk.h>
22 #include <platform.h>
23 #include <ast.h>
24
quirk_astbmc_vga(struct phb * phb __unused,struct pci_device * pd)25 static void quirk_astbmc_vga(struct phb *phb __unused,
26 struct pci_device *pd)
27 {
28 struct dt_node *np = pd->dn;
29 uint32_t revision, mcr_configuration, mcr_scu_mpll, mcr_scu_strap;
30
31 if (ast_sio_is_enabled()) {
32 revision = ast_ahb_readl(SCU_REVISION_ID);
33 mcr_configuration = ast_ahb_readl(MCR_CONFIGURATION);
34 mcr_scu_mpll = ast_ahb_readl(MCR_SCU_MPLL);
35 mcr_scu_strap = ast_ahb_readl(MCR_SCU_STRAP);
36 } else {
37 /* Previously we would warn, now SIO disabled by design */
38 prlog(PR_INFO, "Assumed platform default parameters for %s\n",
39 __func__);
40 revision = bmc_platform->hw->scu_revision_id;
41 mcr_configuration = bmc_platform->hw->mcr_configuration;
42 mcr_scu_mpll = bmc_platform->hw->mcr_scu_mpll;
43 mcr_scu_strap = bmc_platform->hw->mcr_scu_strap;
44 }
45
46 dt_add_property_cells(np, "aspeed,scu-revision-id", revision);
47 dt_add_property_cells(np, "aspeed,mcr-configuration", mcr_configuration);
48 dt_add_property_cells(np, "aspeed,mcr-scu-mpll", mcr_scu_mpll);
49 dt_add_property_cells(np, "aspeed,mcr-scu-strap", mcr_scu_strap);
50 }
51
52 /* Quirks are: {fixup function, vendor ID, (device ID or PCI_ANY_ID)} */
53 static const struct pci_quirk quirk_table[] = {
54 /* ASPEED 2400 VGA device */
55 { &quirk_astbmc_vga, 0x1a03, 0x2000 },
56 { NULL, 0, 0 }
57 };
58
__pci_handle_quirk(struct phb * phb,struct pci_device * pd,const struct pci_quirk * quirks)59 static void __pci_handle_quirk(struct phb *phb, struct pci_device *pd,
60 const struct pci_quirk *quirks)
61 {
62 while (quirks->vendor_id) {
63 if (quirks->vendor_id == PCI_VENDOR_ID(pd->vdid) &&
64 (quirks->device_id == PCI_ANY_ID ||
65 quirks->device_id == PCI_DEVICE_ID(pd->vdid)))
66 quirks->fixup(phb, pd);
67 quirks++;
68 }
69 }
70
pci_handle_quirk(struct phb * phb,struct pci_device * pd)71 void pci_handle_quirk(struct phb *phb, struct pci_device *pd)
72 {
73 __pci_handle_quirk(phb, pd, quirk_table);
74 }
75