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b7e78170 RH |
1 | /* |
2 | * Copyright 2004 Koninklijke Philips Electronics NV | |
3 | * | |
4 | * Conversion to platform driver and DT: | |
5 | * Copyright 2014 Linaro Ltd. | |
6 | * | |
7 | * This software is licensed under the terms of the GNU General Public | |
8 | * License version 2, as published by the Free Software Foundation, and | |
9 | * may be copied, distributed, and modified under those terms. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * 14/04/2005 Initial version, colin.king@philips.com | |
17 | */ | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/of_address.h> | |
21 | #include <linux/of_pci.h> | |
22 | #include <linux/of_platform.h> | |
23 | #include <linux/pci.h> | |
24 | #include <linux/platform_device.h> | |
25 | ||
26 | static void __iomem *versatile_pci_base; | |
27 | static void __iomem *versatile_cfg_base[2]; | |
28 | ||
29 | #define PCI_IMAP(m) (versatile_pci_base + ((m) * 4)) | |
30 | #define PCI_SMAP(m) (versatile_pci_base + 0x14 + ((m) * 4)) | |
31 | #define PCI_SELFID (versatile_pci_base + 0xc) | |
32 | ||
33 | #define VP_PCI_DEVICE_ID 0x030010ee | |
34 | #define VP_PCI_CLASS_ID 0x0b400000 | |
35 | ||
36 | static u32 pci_slot_ignore; | |
37 | ||
38 | static int __init versatile_pci_slot_ignore(char *str) | |
39 | { | |
40 | int retval; | |
41 | int slot; | |
42 | ||
43 | while ((retval = get_option(&str, &slot))) { | |
44 | if ((slot < 0) || (slot > 31)) | |
45 | pr_err("Illegal slot value: %d\n", slot); | |
46 | else | |
47 | pci_slot_ignore |= (1 << slot); | |
48 | } | |
49 | return 1; | |
50 | } | |
51 | __setup("pci_slot_ignore=", versatile_pci_slot_ignore); | |
52 | ||
53 | ||
54 | static void __iomem *versatile_map_bus(struct pci_bus *bus, | |
55 | unsigned int devfn, int offset) | |
56 | { | |
57 | unsigned int busnr = bus->number; | |
58 | ||
59 | if (pci_slot_ignore & (1 << PCI_SLOT(devfn))) | |
60 | return NULL; | |
61 | ||
62 | return versatile_cfg_base[1] + ((busnr << 16) | (devfn << 8) | offset); | |
63 | } | |
64 | ||
65 | static struct pci_ops pci_versatile_ops = { | |
66 | .map_bus = versatile_map_bus, | |
67 | .read = pci_generic_config_read32, | |
68 | .write = pci_generic_config_write, | |
69 | }; | |
70 | ||
71 | static int versatile_pci_parse_request_of_pci_ranges(struct device *dev, | |
72 | struct list_head *res) | |
73 | { | |
74 | int err, mem = 1, res_valid = 0; | |
75 | struct device_node *np = dev->of_node; | |
76 | resource_size_t iobase; | |
77 | struct pci_host_bridge_window *win; | |
78 | ||
79 | err = of_pci_get_host_bridge_resources(np, 0, 0xff, res, &iobase); | |
80 | if (err) | |
81 | return err; | |
82 | ||
83 | list_for_each_entry(win, res, list) { | |
84 | struct resource *parent, *res = win->res; | |
85 | ||
86 | switch (resource_type(res)) { | |
87 | case IORESOURCE_IO: | |
88 | parent = &ioport_resource; | |
89 | err = pci_remap_iospace(res, iobase); | |
90 | if (err) { | |
91 | dev_warn(dev, "error %d: failed to map resource %pR\n", | |
92 | err, res); | |
93 | continue; | |
94 | } | |
95 | break; | |
96 | case IORESOURCE_MEM: | |
97 | parent = &iomem_resource; | |
98 | res_valid |= !(res->flags & IORESOURCE_PREFETCH); | |
99 | ||
100 | writel(res->start >> 28, PCI_IMAP(mem)); | |
101 | writel(PHYS_OFFSET >> 28, PCI_SMAP(mem)); | |
102 | mem++; | |
103 | ||
104 | break; | |
105 | case IORESOURCE_BUS: | |
106 | default: | |
107 | continue; | |
108 | } | |
109 | ||
110 | err = devm_request_resource(dev, parent, res); | |
111 | if (err) | |
112 | goto out_release_res; | |
113 | } | |
114 | ||
115 | if (!res_valid) { | |
116 | dev_err(dev, "non-prefetchable memory resource required\n"); | |
117 | err = -EINVAL; | |
118 | goto out_release_res; | |
119 | } | |
120 | ||
121 | return 0; | |
122 | ||
123 | out_release_res: | |
124 | pci_free_resource_list(res); | |
125 | return err; | |
126 | } | |
127 | ||
128 | /* Unused, temporary to satisfy ARM arch code */ | |
129 | struct pci_sys_data sys; | |
130 | ||
131 | static int versatile_pci_probe(struct platform_device *pdev) | |
132 | { | |
133 | struct resource *res; | |
134 | int ret, i, myslot = -1; | |
135 | u32 val; | |
136 | void __iomem *local_pci_cfg_base; | |
137 | struct pci_bus *bus; | |
138 | LIST_HEAD(pci_res); | |
139 | ||
140 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
141 | if (!res) | |
142 | return -ENODEV; | |
143 | versatile_pci_base = devm_ioremap_resource(&pdev->dev, res); | |
144 | ||
145 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
146 | if (!res) | |
147 | return -ENODEV; | |
148 | versatile_cfg_base[0] = devm_ioremap_resource(&pdev->dev, res); | |
149 | ||
150 | res = platform_get_resource(pdev, IORESOURCE_MEM, 2); | |
151 | if (!res) | |
152 | return -ENODEV; | |
153 | versatile_cfg_base[1] = devm_ioremap_resource(&pdev->dev, res); | |
154 | ||
155 | ret = versatile_pci_parse_request_of_pci_ranges(&pdev->dev, &pci_res); | |
156 | if (ret) | |
157 | return ret; | |
158 | ||
159 | /* | |
160 | * We need to discover the PCI core first to configure itself | |
161 | * before the main PCI probing is performed | |
162 | */ | |
163 | for (i = 0; i < 32; i++) { | |
164 | if ((readl(versatile_cfg_base[0] + (i << 11) + PCI_VENDOR_ID) == VP_PCI_DEVICE_ID) && | |
165 | (readl(versatile_cfg_base[0] + (i << 11) + PCI_CLASS_REVISION) == VP_PCI_CLASS_ID)) { | |
166 | myslot = i; | |
167 | break; | |
168 | } | |
169 | } | |
170 | if (myslot == -1) { | |
171 | dev_err(&pdev->dev, "Cannot find PCI core!\n"); | |
172 | return -EIO; | |
173 | } | |
174 | /* | |
175 | * Do not to map Versatile FPGA PCI device into memory space | |
176 | */ | |
177 | pci_slot_ignore |= (1 << myslot); | |
178 | ||
179 | dev_info(&pdev->dev, "PCI core found (slot %d)\n", myslot); | |
180 | ||
181 | writel(myslot, PCI_SELFID); | |
182 | local_pci_cfg_base = versatile_cfg_base[1] + (myslot << 11); | |
183 | ||
184 | val = readl(local_pci_cfg_base + PCI_COMMAND); | |
185 | val |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE; | |
186 | writel(val, local_pci_cfg_base + PCI_COMMAND); | |
187 | ||
188 | /* | |
189 | * Configure the PCI inbound memory windows to be 1:1 mapped to SDRAM | |
190 | */ | |
191 | writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_0); | |
192 | writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_1); | |
193 | writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_2); | |
194 | ||
195 | /* | |
196 | * For many years the kernel and QEMU were symbiotically buggy | |
197 | * in that they both assumed the same broken IRQ mapping. | |
198 | * QEMU therefore attempts to auto-detect old broken kernels | |
199 | * so that they still work on newer QEMU as they did on old | |
200 | * QEMU. Since we now use the correct (ie matching-hardware) | |
201 | * IRQ mapping we write a definitely different value to a | |
202 | * PCI_INTERRUPT_LINE register to tell QEMU that we expect | |
203 | * real hardware behaviour and it need not be backwards | |
204 | * compatible for us. This write is harmless on real hardware. | |
205 | */ | |
206 | writel(0, versatile_cfg_base[0] + PCI_INTERRUPT_LINE); | |
207 | ||
208 | pci_add_flags(PCI_ENABLE_PROC_DOMAINS); | |
209 | pci_add_flags(PCI_REASSIGN_ALL_BUS | PCI_REASSIGN_ALL_RSRC); | |
210 | ||
211 | bus = pci_scan_root_bus(&pdev->dev, 0, &pci_versatile_ops, &sys, &pci_res); | |
212 | if (!bus) | |
213 | return -ENOMEM; | |
214 | ||
215 | pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci); | |
216 | pci_assign_unassigned_bus_resources(bus); | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static const struct of_device_id versatile_pci_of_match[] = { | |
222 | { .compatible = "arm,versatile-pci", }, | |
223 | { }, | |
224 | }; | |
225 | MODULE_DEVICE_TABLE(of, versatile_pci_of_match); | |
226 | ||
227 | static struct platform_driver versatile_pci_driver = { | |
228 | .driver = { | |
229 | .name = "versatile-pci", | |
230 | .of_match_table = versatile_pci_of_match, | |
231 | }, | |
232 | .probe = versatile_pci_probe, | |
233 | }; | |
234 | module_platform_driver(versatile_pci_driver); | |
235 | ||
236 | MODULE_DESCRIPTION("Versatile PCI driver"); | |
237 | MODULE_LICENSE("GPL v2"); |