xref: /linux/arch/powerpc/platforms/pseries/pci.c (revision ef815d2cba782e96b9aad9483523d474ed41c62a)
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
22 void 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 }
45 DECLARE_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
50 struct 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 
57 static 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(&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(&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 
89 static 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 
103 static 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(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(pdev, 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 					   vf_pe_array[vf_index].pe_num);
142 
143 	kfree(vf_pe_array);
144 	return rc;
145 }
146 
147 static 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(dn, "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(&max_vfs[0], 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(num_vfs,
172 					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(pdn->pe_num_map);
183 	} else {
184 		pci_vf_drivers_autoprobe(pdev, false);
185 	}
186 
187 	return rc;
188 }
189 
190 static 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 
197 static 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(pdn->pe_num_map);
204 	/* Release PCI data */
205 	remove_sriov_vf_pdns(pdev);
206 	pci_vf_drivers_autoprobe(pdev, true);
207 	return 0;
208 }
209 #endif
210 
211 static 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 
224 void __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  */
241 static 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, 0x40, &reg);
251 	/* Enable LEGIRQ to use INTC instead of ISA interrupts */
252 	pci_write_config_dword(dev, 0x40, 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 }
265 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
266 			 fixup_winbond_82c105);
267 
268 static 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 
287 int 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, pcibios_free_controller_deferred,
298 					(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(pdn)) {
305 		rc = of_property_read_u32_array(pdn,
306 				"ibm,pcie-link-speed-stats",
307 				&pcie_link_speed_stats[0], 2);
308 		if (!rc)
309 			break;
310 	}
311 
312 	of_node_put(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(pcie_link_speed_stats[0]);
320 	bus->cur_bus_speed = prop_to_pci_speed(pcie_link_speed_stats[1]);
321 	return 0;
322 }
323