1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2001 Dave Engebretsen, IBM Corporation
4 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
5 *
6 * pSeries specific routines for PCI.
7 */
8
9#include <linux/init.h>
10#include <linux/ioport.h>
11#include <linux/kernel.h>
12#include <linux/pci.h>
13#include <linux/string.h>
14
15#include <asm/eeh.h>
16#include <asm/pci-bridge.h>
17#include <asm/ppc-pci.h>
18#include <asm/pci.h>
19#include "pseries.h"
20
21#if 0
22void pcibios_name_device(struct pci_dev *dev)
23{
24 struct device_node *dn;
25
26 /*
27 * Add IBM loc code (slot) as a prefix to the device names for service
28 */
29 dn = pci_device_to_OF_node(dev);
30 if (dn) {
31 const char *loc_code = of_get_property(dn, "ibm,loc-code",
32 NULL);
33 if (loc_code) {
34 int loc_len = strlen(loc_code);
35 if (loc_len < sizeof(dev->dev.name)) {
36 memmove(dev->dev.name+loc_len+1, dev->dev.name,
37 sizeof(dev->dev.name)-loc_len-1);
38 memcpy(dev->dev.name, loc_code, loc_len);
39 dev->dev.name[loc_len] = ' ';
40 dev->dev.name[sizeof(dev->dev.name)-1] = '\0';
41 }
42 }
43 }
44}
45DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_name_device);
46#endif
47
48#ifdef CONFIG_PCI_IOV
49#define MAX_VFS_FOR_MAP_PE 256
50struct pe_map_bar_entry {
51 __be64 bar; /* Input: Virtual Function BAR */
52 __be16 rid; /* Input: Virtual Function Router ID */
53 __be16 pe_num; /* Output: Virtual Function PE Number */
54 __be32 reserved; /* Reserved Space */
55};
56
57static int pseries_send_map_pe(struct pci_dev *pdev, u16 num_vfs,
58 struct pe_map_bar_entry *vf_pe_array)
59{
60 struct pci_dn *pdn;
61 int rc;
62 unsigned long buid, addr;
63 int ibm_map_pes = rtas_function_token(RTAS_FN_IBM_OPEN_SRIOV_MAP_PE_NUMBER);
64
65 if (ibm_map_pes == RTAS_UNKNOWN_SERVICE)
66 return -EINVAL;
67
68 pdn = pci_get_pdn(pdev);
69 addr = rtas_config_addr(pdn->busno, pdn->devfn, 0);
70 buid = pdn->phb->buid;
71 spin_lock(lock: &rtas_data_buf_lock);
72 memcpy(rtas_data_buf, vf_pe_array,
73 RTAS_DATA_BUF_SIZE);
74 rc = rtas_call(ibm_map_pes, 5, 1, NULL, addr,
75 BUID_HI(buid), BUID_LO(buid),
76 rtas_data_buf,
77 num_vfs * sizeof(struct pe_map_bar_entry));
78 memcpy(vf_pe_array, rtas_data_buf, RTAS_DATA_BUF_SIZE);
79 spin_unlock(lock: &rtas_data_buf_lock);
80
81 if (rc)
82 dev_err(&pdev->dev,
83 "%s: Failed to associate pes PE#%lx, rc=%x\n",
84 __func__, addr, rc);
85
86 return rc;
87}
88
89static void pseries_set_pe_num(struct pci_dev *pdev, u16 vf_index, __be16 pe_num)
90{
91 struct pci_dn *pdn;
92
93 pdn = pci_get_pdn(pdev);
94 pdn->pe_num_map[vf_index] = be16_to_cpu(pe_num);
95 dev_dbg(&pdev->dev, "VF %04x:%02x:%02x.%x associated with PE#%x\n",
96 pci_domain_nr(pdev->bus),
97 pdev->bus->number,
98 PCI_SLOT(pci_iov_virtfn_devfn(pdev, vf_index)),
99 PCI_FUNC(pci_iov_virtfn_devfn(pdev, vf_index)),
100 pdn->pe_num_map[vf_index]);
101}
102
103static int pseries_associate_pes(struct pci_dev *pdev, u16 num_vfs)
104{
105 struct pci_dn *pdn;
106 int i, rc, vf_index;
107 struct pe_map_bar_entry *vf_pe_array;
108 struct resource *res;
109 u64 size;
110
111 vf_pe_array = kzalloc(size: RTAS_DATA_BUF_SIZE, GFP_KERNEL);
112 if (!vf_pe_array)
113 return -ENOMEM;
114
115 pdn = pci_get_pdn(pdev);
116 /* create firmware structure to associate pes */
117 for (vf_index = 0; vf_index < num_vfs; vf_index++) {
118 pdn->pe_num_map[vf_index] = IODA_INVALID_PE;
119 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
120 res = &pdev->resource[i + PCI_IOV_RESOURCES];
121 if (!res->parent)
122 continue;
123 size = pcibios_iov_resource_alignment(dev: pdev, resno: i +
124 PCI_IOV_RESOURCES);
125 vf_pe_array[vf_index].bar =
126 cpu_to_be64(res->start + size * vf_index);
127 vf_pe_array[vf_index].rid =
128 cpu_to_be16((pci_iov_virtfn_bus(pdev, vf_index)
129 << 8) | pci_iov_virtfn_devfn(pdev,
130 vf_index));
131 vf_pe_array[vf_index].pe_num =
132 cpu_to_be16(IODA_INVALID_PE);
133 }
134 }
135
136 rc = pseries_send_map_pe(pdev, num_vfs, vf_pe_array);
137 /* Only zero is success */
138 if (!rc)
139 for (vf_index = 0; vf_index < num_vfs; vf_index++)
140 pseries_set_pe_num(pdev, vf_index,
141 pe_num: vf_pe_array[vf_index].pe_num);
142
143 kfree(objp: vf_pe_array);
144 return rc;
145}
146
147static int pseries_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
148{
149 struct pci_dn *pdn;
150 int rc;
151 const int *max_vfs;
152 int max_config_vfs;
153 struct device_node *dn = pci_device_to_OF_node(pdev);
154
155 max_vfs = of_get_property(node: dn, name: "ibm,number-of-configurable-vfs", NULL);
156
157 if (!max_vfs)
158 return -EINVAL;
159
160 /* First integer stores max config */
161 max_config_vfs = of_read_number(cell: &max_vfs[0], size: 1);
162 if (max_config_vfs < num_vfs && num_vfs > MAX_VFS_FOR_MAP_PE) {
163 dev_err(&pdev->dev,
164 "Num VFs %x > %x Configurable VFs\n",
165 num_vfs, (num_vfs > MAX_VFS_FOR_MAP_PE) ?
166 MAX_VFS_FOR_MAP_PE : max_config_vfs);
167 return -EINVAL;
168 }
169
170 pdn = pci_get_pdn(pdev);
171 pdn->pe_num_map = kmalloc_array(n: num_vfs,
172 size: sizeof(*pdn->pe_num_map),
173 GFP_KERNEL);
174 if (!pdn->pe_num_map)
175 return -ENOMEM;
176
177 rc = pseries_associate_pes(pdev, num_vfs);
178
179 /* Anything other than zero is failure */
180 if (rc) {
181 dev_err(&pdev->dev, "Failure to enable sriov: %x\n", rc);
182 kfree(objp: pdn->pe_num_map);
183 } else {
184 pci_vf_drivers_autoprobe(dev: pdev, probe: false);
185 }
186
187 return rc;
188}
189
190static int pseries_pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
191{
192 /* Allocate PCI data */
193 add_sriov_vf_pdns(pdev);
194 return pseries_pci_sriov_enable(pdev, num_vfs);
195}
196
197static int pseries_pcibios_sriov_disable(struct pci_dev *pdev)
198{
199 struct pci_dn *pdn;
200
201 pdn = pci_get_pdn(pdev);
202 /* Releasing pe_num_map */
203 kfree(objp: pdn->pe_num_map);
204 /* Release PCI data */
205 remove_sriov_vf_pdns(pdev);
206 pci_vf_drivers_autoprobe(dev: pdev, probe: true);
207 return 0;
208}
209#endif
210
211static void __init pSeries_request_regions(void)
212{
213 if (!isa_io_base)
214 return;
215
216 request_region(0x20,0x20,"pic1");
217 request_region(0xa0,0x20,"pic2");
218 request_region(0x00,0x20,"dma1");
219 request_region(0x40,0x20,"timer");
220 request_region(0x80,0x10,"dma page reg");
221 request_region(0xc0,0x20,"dma2");
222}
223
224void __init pSeries_final_fixup(void)
225{
226 pSeries_request_regions();
227
228 eeh_show_enabled();
229
230#ifdef CONFIG_PCI_IOV
231 ppc_md.pcibios_sriov_enable = pseries_pcibios_sriov_enable;
232 ppc_md.pcibios_sriov_disable = pseries_pcibios_sriov_disable;
233#endif
234}
235
236/*
237 * Assume the winbond 82c105 is the IDE controller on a
238 * p610/p615/p630. We should probably be more careful in case
239 * someone tries to plug in a similar adapter.
240 */
241static void fixup_winbond_82c105(struct pci_dev* dev)
242{
243 struct resource *r;
244 unsigned int reg;
245
246 if (!machine_is(pseries))
247 return;
248
249 printk("Using INTC for W82c105 IDE controller.\n");
250 pci_read_config_dword(dev, where: 0x40, val: &reg);
251 /* Enable LEGIRQ to use INTC instead of ISA interrupts */
252 pci_write_config_dword(dev, where: 0x40, val: reg | (1<<11));
253
254 pci_dev_for_each_resource(dev, r) {
255 /* zap the 2nd function of the winbond chip */
256 if (dev->bus->number == 0 && dev->devfn == 0x81 &&
257 r->flags & IORESOURCE_IO)
258 r->flags &= ~IORESOURCE_IO;
259 if (r->start == 0 && r->end) {
260 r->flags = 0;
261 r->end = 0;
262 }
263 }
264}
265DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
266 fixup_winbond_82c105);
267
268static enum pci_bus_speed prop_to_pci_speed(u32 prop)
269{
270 switch (prop) {
271 case 0x01:
272 return PCIE_SPEED_2_5GT;
273 case 0x02:
274 return PCIE_SPEED_5_0GT;
275 case 0x04:
276 return PCIE_SPEED_8_0GT;
277 case 0x08:
278 return PCIE_SPEED_16_0GT;
279 case 0x10:
280 return PCIE_SPEED_32_0GT;
281 default:
282 pr_debug("Unexpected PCI link speed property value\n");
283 return PCI_SPEED_UNKNOWN;
284 }
285}
286
287int pseries_root_bridge_prepare(struct pci_host_bridge *bridge)
288{
289 struct device_node *dn, *pdn;
290 struct pci_bus *bus;
291 u32 pcie_link_speed_stats[2];
292 int rc;
293
294 bus = bridge->bus;
295
296 /* Rely on the pcibios_free_controller_deferred() callback. */
297 pci_set_host_bridge_release(bridge, release_fn: pcibios_free_controller_deferred,
298 release_data: (void *) pci_bus_to_host(bus));
299
300 dn = pcibios_get_phb_of_node(bus);
301 if (!dn)
302 return 0;
303
304 for (pdn = dn; pdn != NULL; pdn = of_get_next_parent(node: pdn)) {
305 rc = of_property_read_u32_array(np: pdn,
306 propname: "ibm,pcie-link-speed-stats",
307 out_values: &pcie_link_speed_stats[0], sz: 2);
308 if (!rc)
309 break;
310 }
311
312 of_node_put(node: pdn);
313
314 if (rc) {
315 pr_debug("no ibm,pcie-link-speed-stats property\n");
316 return 0;
317 }
318
319 bus->max_bus_speed = prop_to_pci_speed(prop: pcie_link_speed_stats[0]);
320 bus->cur_bus_speed = prop_to_pci_speed(prop: pcie_link_speed_stats[1]);
321 return 0;
322}
323

source code of linux/arch/powerpc/platforms/pseries/pci.c