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Linux/arch/powerpc/sysdev/ppc4xx_msi.c

  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>
 25 #include <linux/pci.h>
 26 #include <linux/msi.h>
 27 #include <linux/of_platform.h>
 28 #include <linux/interrupt.h>
 29 #include <linux/export.h>
 30 #include <linux/kernel.h>
 31 #include <asm/prom.h>
 32 #include <asm/hw_irq.h>
 33 #include <asm/ppc-pci.h>
 34 #include <asm/dcr.h>
 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
 46 
 47 static int msi_irqs;
 48 
 49 struct ppc4xx_msi {
 50         u32 msi_addr_lo;
 51         u32 msi_addr_hi;
 52         void __iomem *msi_regs;
 53         int *msi_virqs;
 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 
 65         err = msi_bitmap_alloc(&msi_data->bitmap, msi_irqs,
 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 
 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);
 93         if (!msi_data->msi_virqs)
 94                 return -ENOMEM;
 95 
 96         list_for_each_entry(entry, &dev->msi_list, list) {
 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;
118                 pci_write_msi_msg(virq, &msg);
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;
127 
128         dev_dbg(&dev->dev, "PCIE-MSI: tearing down msi irqs\n");
129 
130         list_for_each_entry(entry, &dev->msi_list, list) {
131                 if (entry->irq == NO_IRQ)
132                         continue;
133                 irq_set_msi_desc(entry->irq, NULL);
134                 msi_bitmap_free_hwirqs(&msi_data->bitmap,
135                                 virq_to_hw(entry->irq), 1);
136                 irq_dispose_mapping(entry->irq);
137         }
138 }
139 
140 static int ppc4xx_setup_pcieh_hw(struct platform_device *dev,
141                                  struct resource res, struct ppc4xx_msi *msi)
142 {
143         const u32 *msi_data;
144         const u32 *msi_mask;
145         const u32 *sdr_addr;
146         dma_addr_t msi_phys;
147         void *msi_virt;
148 
149         sdr_addr = of_get_property(dev->dev.of_node, "sdr-base", NULL);
150         if (!sdr_addr)
151                 return -1;
152 
153         mtdcri(SDR0, *sdr_addr, upper_32_bits(res.start));      /*HIGH addr */
154         mtdcri(SDR0, *sdr_addr + 1, lower_32_bits(res.start));  /* Low addr */
155 
156         msi->msi_dev = of_find_node_by_name(NULL, "ppc4xx-msi");
157         if (!msi->msi_dev)
158                 return -ENODEV;
159 
160         msi->msi_regs = of_iomap(msi->msi_dev, 0);
161         if (!msi->msi_regs) {
162                 dev_err(&dev->dev, "of_iomap problem failed\n");
163                 return -ENOMEM;
164         }
165         dev_dbg(&dev->dev, "PCIE-MSI: msi register mapped 0x%x 0x%x\n",
166                 (u32) (msi->msi_regs + PEIH_TERMADH), (u32) (msi->msi_regs));
167 
168         msi_virt = dma_alloc_coherent(&dev->dev, 64, &msi_phys, GFP_KERNEL);
169         if (!msi_virt)
170                 return -ENOMEM;
171         msi->msi_addr_hi = upper_32_bits(msi_phys);
172         msi->msi_addr_lo = lower_32_bits(msi_phys & 0xffffffff);
173         dev_dbg(&dev->dev, "PCIE-MSI: msi address high 0x%x, low 0x%x\n",
174                 msi->msi_addr_hi, msi->msi_addr_lo);
175 
176         /* Progam the Interrupt handler Termination addr registers */
177         out_be32(msi->msi_regs + PEIH_TERMADH, msi->msi_addr_hi);
178         out_be32(msi->msi_regs + PEIH_TERMADL, msi->msi_addr_lo);
179 
180         msi_data = of_get_property(dev->dev.of_node, "msi-data", NULL);
181         if (!msi_data)
182                 return -1;
183         msi_mask = of_get_property(dev->dev.of_node, "msi-mask", NULL);
184         if (!msi_mask)
185                 return -1;
186         /* Program MSI Expected data and Mask bits */
187         out_be32(msi->msi_regs + PEIH_MSIED, *msi_data);
188         out_be32(msi->msi_regs + PEIH_MSIMK, *msi_mask);
189 
190         dma_free_coherent(&dev->dev, 64, msi_virt, msi_phys);
191 
192         return 0;
193 }
194 
195 static int ppc4xx_of_msi_remove(struct platform_device *dev)
196 {
197         struct ppc4xx_msi *msi = dev->dev.platform_data;
198         int i;
199         int virq;
200 
201         for (i = 0; i < msi_irqs; i++) {
202                 virq = msi->msi_virqs[i];
203                 if (virq != NO_IRQ)
204                         irq_dispose_mapping(virq);
205         }
206 
207         if (msi->bitmap.bitmap)
208                 msi_bitmap_free(&msi->bitmap);
209         iounmap(msi->msi_regs);
210         of_node_put(msi->msi_dev);
211         kfree(msi);
212 
213         return 0;
214 }
215 
216 static int ppc4xx_msi_probe(struct platform_device *dev)
217 {
218         struct ppc4xx_msi *msi;
219         struct resource res;
220         int err = 0;
221 
222         dev_dbg(&dev->dev, "PCIE-MSI: Setting up MSI support...\n");
223 
224         msi = kzalloc(sizeof(struct ppc4xx_msi), GFP_KERNEL);
225         if (!msi) {
226                 dev_err(&dev->dev, "No memory for MSI structure\n");
227                 return -ENOMEM;
228         }
229         dev->dev.platform_data = msi;
230 
231         /* Get MSI ranges */
232         err = of_address_to_resource(dev->dev.of_node, 0, &res);
233         if (err) {
234                 dev_err(&dev->dev, "%s resource error!\n",
235                         dev->dev.of_node->full_name);
236                 goto error_out;
237         }
238 
239         msi_irqs = of_irq_count(dev->dev.of_node);
240         if (!msi_irqs)
241                 return -ENODEV;
242 
243         if (ppc4xx_setup_pcieh_hw(dev, res, msi))
244                 goto error_out;
245 
246         err = ppc4xx_msi_init_allocator(dev, msi);
247         if (err) {
248                 dev_err(&dev->dev, "Error allocating MSI bitmap\n");
249                 goto error_out;
250         }
251         ppc4xx_msi = *msi;
252 
253         ppc_md.setup_msi_irqs = ppc4xx_setup_msi_irqs;
254         ppc_md.teardown_msi_irqs = ppc4xx_teardown_msi_irqs;
255         return err;
256 
257 error_out:
258         ppc4xx_of_msi_remove(dev);
259         return err;
260 }
261 static const struct of_device_id ppc4xx_msi_ids[] = {
262         {
263                 .compatible = "amcc,ppc4xx-msi",
264         },
265         {}
266 };
267 static struct platform_driver ppc4xx_msi_driver = {
268         .probe = ppc4xx_msi_probe,
269         .remove = ppc4xx_of_msi_remove,
270         .driver = {
271                    .name = "ppc4xx-msi",
272                    .of_match_table = ppc4xx_msi_ids,
273                    },
274 
275 };
276 
277 static __init int ppc4xx_msi_init(void)
278 {
279         return platform_driver_register(&ppc4xx_msi_driver);
280 }
281 
282 subsys_initcall(ppc4xx_msi_init);
283 

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