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3fb79338 RS |
1 | /* |
2 | * Adding PCI-E MSI support for PPC4XX SoCs. | |
3 | * | |
4 | * Copyright (c) 2010, Applied Micro Circuits Corporation | |
5 | * Authors: Tirumala R Marri <tmarri@apm.com> | |
6 | * Feng Kan <fkan@apm.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation; either version 2 of | |
11 | * the License, or (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
21 | * MA 02111-1307 USA | |
22 | */ | |
23 | ||
24 | #include <linux/irq.h> | |
3fb79338 RS |
25 | #include <linux/pci.h> |
26 | #include <linux/msi.h> | |
27 | #include <linux/of_platform.h> | |
28 | #include <linux/interrupt.h> | |
93087948 | 29 | #include <linux/export.h> |
247540b0 | 30 | #include <linux/kernel.h> |
3fb79338 RS |
31 | #include <asm/prom.h> |
32 | #include <asm/hw_irq.h> | |
33 | #include <asm/ppc-pci.h> | |
247540b0 | 34 | #include <asm/dcr.h> |
3fb79338 RS |
35 | #include <asm/dcr-regs.h> |
36 | #include <asm/msi_bitmap.h> | |
37 | ||
38 | #define PEIH_TERMADH 0x00 | |
39 | #define PEIH_TERMADL 0x08 | |
40 | #define PEIH_MSIED 0x10 | |
41 | #define PEIH_MSIMK 0x18 | |
42 | #define PEIH_MSIASS 0x20 | |
43 | #define PEIH_FLUSH0 0x30 | |
44 | #define PEIH_FLUSH1 0x38 | |
45 | #define PEIH_CNTRST 0x48 | |
247540b0 ML |
46 | |
47 | static int msi_irqs; | |
3fb79338 RS |
48 | |
49 | struct ppc4xx_msi { | |
50 | u32 msi_addr_lo; | |
51 | u32 msi_addr_hi; | |
52 | void __iomem *msi_regs; | |
247540b0 | 53 | int *msi_virqs; |
3fb79338 RS |
54 | struct msi_bitmap bitmap; |
55 | struct device_node *msi_dev; | |
56 | }; | |
57 | ||
58 | static struct ppc4xx_msi ppc4xx_msi; | |
59 | ||
60 | static int ppc4xx_msi_init_allocator(struct platform_device *dev, | |
61 | struct ppc4xx_msi *msi_data) | |
62 | { | |
63 | int err; | |
64 | ||
247540b0 | 65 | err = msi_bitmap_alloc(&msi_data->bitmap, msi_irqs, |
3fb79338 RS |
66 | dev->dev.of_node); |
67 | if (err) | |
68 | return err; | |
69 | ||
70 | err = msi_bitmap_reserve_dt_hwirqs(&msi_data->bitmap); | |
71 | if (err < 0) { | |
72 | msi_bitmap_free(&msi_data->bitmap); | |
73 | return err; | |
74 | } | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | static int ppc4xx_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) | |
80 | { | |
81 | int int_no = -ENOMEM; | |
82 | unsigned int virq; | |
83 | struct msi_msg msg; | |
84 | struct msi_desc *entry; | |
85 | struct ppc4xx_msi *msi_data = &ppc4xx_msi; | |
86 | ||
6b2fd7ef AG |
87 | dev_dbg(&dev->dev, "PCIE-MSI:%s called. vec %x type %d\n", |
88 | __func__, nvec, type); | |
89 | if (type == PCI_CAP_ID_MSIX) | |
90 | pr_debug("ppc4xx msi: MSI-X untested, trying anyway.\n"); | |
91 | ||
92 | msi_data->msi_virqs = kmalloc((msi_irqs) * sizeof(int), GFP_KERNEL); | |
247540b0 ML |
93 | if (!msi_data->msi_virqs) |
94 | return -ENOMEM; | |
95 | ||
2921d179 | 96 | for_each_pci_msi_entry(entry, dev) { |
3fb79338 RS |
97 | int_no = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1); |
98 | if (int_no >= 0) | |
99 | break; | |
100 | if (int_no < 0) { | |
101 | pr_debug("%s: fail allocating msi interrupt\n", | |
102 | __func__); | |
103 | } | |
104 | virq = irq_of_parse_and_map(msi_data->msi_dev, int_no); | |
105 | if (virq == NO_IRQ) { | |
106 | dev_err(&dev->dev, "%s: fail mapping irq\n", __func__); | |
107 | msi_bitmap_free_hwirqs(&msi_data->bitmap, int_no, 1); | |
108 | return -ENOSPC; | |
109 | } | |
110 | dev_dbg(&dev->dev, "%s: virq = %d\n", __func__, virq); | |
111 | ||
112 | /* Setup msi address space */ | |
113 | msg.address_hi = msi_data->msi_addr_hi; | |
114 | msg.address_lo = msi_data->msi_addr_lo; | |
115 | ||
116 | irq_set_msi_desc(virq, entry); | |
117 | msg.data = int_no; | |
83a18912 | 118 | pci_write_msi_msg(virq, &msg); |
3fb79338 RS |
119 | } |
120 | return 0; | |
121 | } | |
122 | ||
123 | void ppc4xx_teardown_msi_irqs(struct pci_dev *dev) | |
124 | { | |
125 | struct msi_desc *entry; | |
126 | struct ppc4xx_msi *msi_data = &ppc4xx_msi; | |
e297c939 | 127 | irq_hw_number_t hwirq; |
3fb79338 RS |
128 | |
129 | dev_dbg(&dev->dev, "PCIE-MSI: tearing down msi irqs\n"); | |
130 | ||
2921d179 | 131 | for_each_pci_msi_entry(entry, dev) { |
3fb79338 RS |
132 | if (entry->irq == NO_IRQ) |
133 | continue; | |
e297c939 | 134 | hwirq = virq_to_hw(entry->irq); |
3fb79338 | 135 | irq_set_msi_desc(entry->irq, NULL); |
3fb79338 | 136 | irq_dispose_mapping(entry->irq); |
e297c939 | 137 | msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1); |
3fb79338 RS |
138 | } |
139 | } | |
140 | ||
3fb79338 RS |
141 | static int ppc4xx_setup_pcieh_hw(struct platform_device *dev, |
142 | struct resource res, struct ppc4xx_msi *msi) | |
143 | { | |
144 | const u32 *msi_data; | |
145 | const u32 *msi_mask; | |
146 | const u32 *sdr_addr; | |
147 | dma_addr_t msi_phys; | |
148 | void *msi_virt; | |
149 | ||
150 | sdr_addr = of_get_property(dev->dev.of_node, "sdr-base", NULL); | |
151 | if (!sdr_addr) | |
152 | return -1; | |
153 | ||
247540b0 ML |
154 | mtdcri(SDR0, *sdr_addr, upper_32_bits(res.start)); /*HIGH addr */ |
155 | mtdcri(SDR0, *sdr_addr + 1, lower_32_bits(res.start)); /* Low addr */ | |
3fb79338 RS |
156 | |
157 | msi->msi_dev = of_find_node_by_name(NULL, "ppc4xx-msi"); | |
247540b0 | 158 | if (!msi->msi_dev) |
3fb79338 RS |
159 | return -ENODEV; |
160 | ||
161 | msi->msi_regs = of_iomap(msi->msi_dev, 0); | |
162 | if (!msi->msi_regs) { | |
163 | dev_err(&dev->dev, "of_iomap problem failed\n"); | |
164 | return -ENOMEM; | |
165 | } | |
166 | dev_dbg(&dev->dev, "PCIE-MSI: msi register mapped 0x%x 0x%x\n", | |
167 | (u32) (msi->msi_regs + PEIH_TERMADH), (u32) (msi->msi_regs)); | |
168 | ||
169 | msi_virt = dma_alloc_coherent(&dev->dev, 64, &msi_phys, GFP_KERNEL); | |
247540b0 ML |
170 | if (!msi_virt) |
171 | return -ENOMEM; | |
dce4c92d JB |
172 | msi->msi_addr_hi = upper_32_bits(msi_phys); |
173 | msi->msi_addr_lo = lower_32_bits(msi_phys & 0xffffffff); | |
247540b0 ML |
174 | dev_dbg(&dev->dev, "PCIE-MSI: msi address high 0x%x, low 0x%x\n", |
175 | msi->msi_addr_hi, msi->msi_addr_lo); | |
3fb79338 RS |
176 | |
177 | /* Progam the Interrupt handler Termination addr registers */ | |
178 | out_be32(msi->msi_regs + PEIH_TERMADH, msi->msi_addr_hi); | |
179 | out_be32(msi->msi_regs + PEIH_TERMADL, msi->msi_addr_lo); | |
180 | ||
181 | msi_data = of_get_property(dev->dev.of_node, "msi-data", NULL); | |
182 | if (!msi_data) | |
183 | return -1; | |
184 | msi_mask = of_get_property(dev->dev.of_node, "msi-mask", NULL); | |
185 | if (!msi_mask) | |
186 | return -1; | |
187 | /* Program MSI Expected data and Mask bits */ | |
188 | out_be32(msi->msi_regs + PEIH_MSIED, *msi_data); | |
189 | out_be32(msi->msi_regs + PEIH_MSIMK, *msi_mask); | |
190 | ||
247540b0 ML |
191 | dma_free_coherent(&dev->dev, 64, msi_virt, msi_phys); |
192 | ||
3fb79338 RS |
193 | return 0; |
194 | } | |
195 | ||
196 | static int ppc4xx_of_msi_remove(struct platform_device *dev) | |
197 | { | |
198 | struct ppc4xx_msi *msi = dev->dev.platform_data; | |
199 | int i; | |
200 | int virq; | |
201 | ||
247540b0 | 202 | for (i = 0; i < msi_irqs; i++) { |
3fb79338 RS |
203 | virq = msi->msi_virqs[i]; |
204 | if (virq != NO_IRQ) | |
205 | irq_dispose_mapping(virq); | |
206 | } | |
207 | ||
208 | if (msi->bitmap.bitmap) | |
209 | msi_bitmap_free(&msi->bitmap); | |
210 | iounmap(msi->msi_regs); | |
211 | of_node_put(msi->msi_dev); | |
212 | kfree(msi); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
cad5cef6 | 217 | static int ppc4xx_msi_probe(struct platform_device *dev) |
3fb79338 RS |
218 | { |
219 | struct ppc4xx_msi *msi; | |
220 | struct resource res; | |
221 | int err = 0; | |
b7eba2ff | 222 | struct pci_controller *phb; |
3fb79338 | 223 | |
3fb79338 RS |
224 | dev_dbg(&dev->dev, "PCIE-MSI: Setting up MSI support...\n"); |
225 | ||
226 | msi = kzalloc(sizeof(struct ppc4xx_msi), GFP_KERNEL); | |
227 | if (!msi) { | |
228 | dev_err(&dev->dev, "No memory for MSI structure\n"); | |
229 | return -ENOMEM; | |
230 | } | |
231 | dev->dev.platform_data = msi; | |
232 | ||
233 | /* Get MSI ranges */ | |
234 | err = of_address_to_resource(dev->dev.of_node, 0, &res); | |
235 | if (err) { | |
236 | dev_err(&dev->dev, "%s resource error!\n", | |
237 | dev->dev.of_node->full_name); | |
238 | goto error_out; | |
239 | } | |
240 | ||
247540b0 ML |
241 | msi_irqs = of_irq_count(dev->dev.of_node); |
242 | if (!msi_irqs) | |
243 | return -ENODEV; | |
244 | ||
3fb79338 RS |
245 | if (ppc4xx_setup_pcieh_hw(dev, res, msi)) |
246 | goto error_out; | |
247 | ||
248 | err = ppc4xx_msi_init_allocator(dev, msi); | |
249 | if (err) { | |
250 | dev_err(&dev->dev, "Error allocating MSI bitmap\n"); | |
251 | goto error_out; | |
252 | } | |
247540b0 | 253 | ppc4xx_msi = *msi; |
3fb79338 | 254 | |
b7eba2ff DA |
255 | list_for_each_entry(phb, &hose_list, list_node) { |
256 | phb->controller_ops.setup_msi_irqs = ppc4xx_setup_msi_irqs; | |
257 | phb->controller_ops.teardown_msi_irqs = ppc4xx_teardown_msi_irqs; | |
258 | } | |
3fb79338 RS |
259 | return err; |
260 | ||
261 | error_out: | |
262 | ppc4xx_of_msi_remove(dev); | |
263 | return err; | |
264 | } | |
265 | static const struct of_device_id ppc4xx_msi_ids[] = { | |
266 | { | |
267 | .compatible = "amcc,ppc4xx-msi", | |
268 | }, | |
269 | {} | |
270 | }; | |
271 | static struct platform_driver ppc4xx_msi_driver = { | |
272 | .probe = ppc4xx_msi_probe, | |
273 | .remove = ppc4xx_of_msi_remove, | |
274 | .driver = { | |
275 | .name = "ppc4xx-msi", | |
3fb79338 RS |
276 | .of_match_table = ppc4xx_msi_ids, |
277 | }, | |
278 | ||
279 | }; | |
280 | ||
281 | static __init int ppc4xx_msi_init(void) | |
282 | { | |
283 | return platform_driver_register(&ppc4xx_msi_driver); | |
284 | } | |
285 | ||
286 | subsys_initcall(ppc4xx_msi_init); |