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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/bootmem.h>
 26 #include <linux/pci.h>
 27 #include <linux/msi.h>
 28 #include <linux/of_platform.h>
 29 #include <linux/interrupt.h>
 30 #include <linux/export.h>
 31 #include <linux/kernel.h>
 32 #include <asm/prom.h>
 33 #include <asm/hw_irq.h>
 34 #include <asm/ppc-pci.h>
 35 #include <asm/dcr.h>
 36 #include <asm/dcr-regs.h>
 37 #include <asm/msi_bitmap.h>
 38 
 39 #define PEIH_TERMADH    0x00
 40 #define PEIH_TERMADL    0x08
 41 #define PEIH_MSIED      0x10
 42 #define PEIH_MSIMK      0x18
 43 #define PEIH_MSIASS     0x20
 44 #define PEIH_FLUSH0     0x30
 45 #define PEIH_FLUSH1     0x38
 46 #define PEIH_CNTRST     0x48
 47 
 48 static int msi_irqs;
 49 
 50 struct ppc4xx_msi {
 51         u32 msi_addr_lo;
 52         u32 msi_addr_hi;
 53         void __iomem *msi_regs;
 54         int *msi_virqs;
 55         struct msi_bitmap bitmap;
 56         struct device_node *msi_dev;
 57 };
 58 
 59 static struct ppc4xx_msi ppc4xx_msi;
 60 
 61 static int ppc4xx_msi_init_allocator(struct platform_device *dev,
 62                 struct ppc4xx_msi *msi_data)
 63 {
 64         int err;
 65 
 66         err = msi_bitmap_alloc(&msi_data->bitmap, msi_irqs,
 67                               dev->dev.of_node);
 68         if (err)
 69                 return err;
 70 
 71         err = msi_bitmap_reserve_dt_hwirqs(&msi_data->bitmap);
 72         if (err < 0) {
 73                 msi_bitmap_free(&msi_data->bitmap);
 74                 return err;
 75         }
 76 
 77         return 0;
 78 }
 79 
 80 static int ppc4xx_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 81 {
 82         int int_no = -ENOMEM;
 83         unsigned int virq;
 84         struct msi_msg msg;
 85         struct msi_desc *entry;
 86         struct ppc4xx_msi *msi_data = &ppc4xx_msi;
 87 
 88         dev_dbg(&dev->dev, "PCIE-MSI:%s called. vec %x type %d\n",
 89                 __func__, nvec, type);
 90         if (type == PCI_CAP_ID_MSIX)
 91                 pr_debug("ppc4xx msi: MSI-X untested, trying anyway.\n");
 92 
 93         msi_data->msi_virqs = kmalloc((msi_irqs) * sizeof(int), GFP_KERNEL);
 94         if (!msi_data->msi_virqs)
 95                 return -ENOMEM;
 96 
 97         list_for_each_entry(entry, &dev->msi_list, list) {
 98                 int_no = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);
 99                 if (int_no >= 0)
100                         break;
101                 if (int_no < 0) {
102                         pr_debug("%s: fail allocating msi interrupt\n",
103                                         __func__);
104                 }
105                 virq = irq_of_parse_and_map(msi_data->msi_dev, int_no);
106                 if (virq == NO_IRQ) {
107                         dev_err(&dev->dev, "%s: fail mapping irq\n", __func__);
108                         msi_bitmap_free_hwirqs(&msi_data->bitmap, int_no, 1);
109                         return -ENOSPC;
110                 }
111                 dev_dbg(&dev->dev, "%s: virq = %d\n", __func__, virq);
112 
113                 /* Setup msi address space */
114                 msg.address_hi = msi_data->msi_addr_hi;
115                 msg.address_lo = msi_data->msi_addr_lo;
116 
117                 irq_set_msi_desc(virq, entry);
118                 msg.data = int_no;
119                 write_msi_msg(virq, &msg);
120         }
121         return 0;
122 }
123 
124 void ppc4xx_teardown_msi_irqs(struct pci_dev *dev)
125 {
126         struct msi_desc *entry;
127         struct ppc4xx_msi *msi_data = &ppc4xx_msi;
128 
129         dev_dbg(&dev->dev, "PCIE-MSI: tearing down msi irqs\n");
130 
131         list_for_each_entry(entry, &dev->msi_list, list) {
132                 if (entry->irq == NO_IRQ)
133                         continue;
134                 irq_set_msi_desc(entry->irq, NULL);
135                 msi_bitmap_free_hwirqs(&msi_data->bitmap,
136                                 virq_to_hw(entry->irq), 1);
137                 irq_dispose_mapping(entry->irq);
138         }
139 }
140 
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 
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 */
156 
157         msi->msi_dev = of_find_node_by_name(NULL, "ppc4xx-msi");
158         if (!msi->msi_dev)
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);
170         if (!msi_virt)
171                 return -ENOMEM;
172         msi->msi_addr_hi = upper_32_bits(msi_phys);
173         msi->msi_addr_lo = lower_32_bits(msi_phys & 0xffffffff);
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);
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 
191         dma_free_coherent(&dev->dev, 64, msi_virt, msi_phys);
192 
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 
202         for (i = 0; i < msi_irqs; i++) {
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 
217 static int ppc4xx_msi_probe(struct platform_device *dev)
218 {
219         struct ppc4xx_msi *msi;
220         struct resource res;
221         int err = 0;
222 
223         dev_dbg(&dev->dev, "PCIE-MSI: Setting up MSI support...\n");
224 
225         msi = kzalloc(sizeof(struct ppc4xx_msi), GFP_KERNEL);
226         if (!msi) {
227                 dev_err(&dev->dev, "No memory for MSI structure\n");
228                 return -ENOMEM;
229         }
230         dev->dev.platform_data = msi;
231 
232         /* Get MSI ranges */
233         err = of_address_to_resource(dev->dev.of_node, 0, &res);
234         if (err) {
235                 dev_err(&dev->dev, "%s resource error!\n",
236                         dev->dev.of_node->full_name);
237                 goto error_out;
238         }
239 
240         msi_irqs = of_irq_count(dev->dev.of_node);
241         if (!msi_irqs)
242                 return -ENODEV;
243 
244         if (ppc4xx_setup_pcieh_hw(dev, res, msi))
245                 goto error_out;
246 
247         err = ppc4xx_msi_init_allocator(dev, msi);
248         if (err) {
249                 dev_err(&dev->dev, "Error allocating MSI bitmap\n");
250                 goto error_out;
251         }
252         ppc4xx_msi = *msi;
253 
254         ppc_md.setup_msi_irqs = ppc4xx_setup_msi_irqs;
255         ppc_md.teardown_msi_irqs = ppc4xx_teardown_msi_irqs;
256         return err;
257 
258 error_out:
259         ppc4xx_of_msi_remove(dev);
260         return err;
261 }
262 static const struct of_device_id ppc4xx_msi_ids[] = {
263         {
264                 .compatible = "amcc,ppc4xx-msi",
265         },
266         {}
267 };
268 static struct platform_driver ppc4xx_msi_driver = {
269         .probe = ppc4xx_msi_probe,
270         .remove = ppc4xx_of_msi_remove,
271         .driver = {
272                    .name = "ppc4xx-msi",
273                    .owner = THIS_MODULE,
274                    .of_match_table = ppc4xx_msi_ids,
275                    },
276 
277 };
278 
279 static __init int ppc4xx_msi_init(void)
280 {
281         return platform_driver_register(&ppc4xx_msi_driver);
282 }
283 
284 subsys_initcall(ppc4xx_msi_init);
285 

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