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Linux/arch/x86/pci/sta2x11-fixup.c

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  1 /*
  2  * arch/x86/pci/sta2x11-fixup.c
  3  * glue code for lib/swiotlb.c and DMA translation between STA2x11
  4  * AMBA memory mapping and the X86 memory mapping
  5  *
  6  * ST Microelectronics ConneXt (STA2X11/STA2X10)
  7  *
  8  * Copyright (c) 2010-2011 Wind River Systems, Inc.
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License version 2 as
 12  * published by the Free Software Foundation.
 13  *
 14  * This program is distributed in the hope that it will be useful,
 15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 17  * See the GNU General Public License for more details.
 18  *
 19  * You should have received a copy of the GNU General Public License
 20  * along with this program; if not, write to the Free Software
 21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 22  *
 23  */
 24 
 25 #include <linux/pci.h>
 26 #include <linux/pci_ids.h>
 27 #include <linux/export.h>
 28 #include <linux/list.h>
 29 
 30 #define STA2X11_SWIOTLB_SIZE (4*1024*1024)
 31 extern int swiotlb_late_init_with_default_size(size_t default_size);
 32 
 33 /*
 34  * We build a list of bus numbers that are under the ConneXt. The
 35  * main bridge hosts 4 busses, which are the 4 endpoints, in order.
 36  */
 37 #define STA2X11_NR_EP           4       /* 0..3 included */
 38 #define STA2X11_NR_FUNCS        8       /* 0..7 included */
 39 #define STA2X11_AMBA_SIZE       (512 << 20)
 40 
 41 struct sta2x11_ahb_regs { /* saved during suspend */
 42         u32 base, pexlbase, pexhbase, crw;
 43 };
 44 
 45 struct sta2x11_mapping {
 46         u32 amba_base;
 47         int is_suspended;
 48         struct sta2x11_ahb_regs regs[STA2X11_NR_FUNCS];
 49 };
 50 
 51 struct sta2x11_instance {
 52         struct list_head list;
 53         int bus0;
 54         struct sta2x11_mapping map[STA2X11_NR_EP];
 55 };
 56 
 57 static LIST_HEAD(sta2x11_instance_list);
 58 
 59 /* At probe time, record new instances of this bridge (likely one only) */
 60 static void sta2x11_new_instance(struct pci_dev *pdev)
 61 {
 62         struct sta2x11_instance *instance;
 63 
 64         instance = kzalloc(sizeof(*instance), GFP_ATOMIC);
 65         if (!instance)
 66                 return;
 67         /* This has a subordinate bridge, with 4 more-subordinate ones */
 68         instance->bus0 = pdev->subordinate->number + 1;
 69 
 70         if (list_empty(&sta2x11_instance_list)) {
 71                 int size = STA2X11_SWIOTLB_SIZE;
 72                 /* First instance: register your own swiotlb area */
 73                 dev_info(&pdev->dev, "Using SWIOTLB (size %i)\n", size);
 74                 if (swiotlb_late_init_with_default_size(size))
 75                         dev_emerg(&pdev->dev, "init swiotlb failed\n");
 76         }
 77         list_add(&instance->list, &sta2x11_instance_list);
 78 }
 79 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, 0xcc17, sta2x11_new_instance);
 80 
 81 /*
 82  * Utility functions used in this file from below
 83  */
 84 static struct sta2x11_instance *sta2x11_pdev_to_instance(struct pci_dev *pdev)
 85 {
 86         struct sta2x11_instance *instance;
 87         int ep;
 88 
 89         list_for_each_entry(instance, &sta2x11_instance_list, list) {
 90                 ep = pdev->bus->number - instance->bus0;
 91                 if (ep >= 0 && ep < STA2X11_NR_EP)
 92                         return instance;
 93         }
 94         return NULL;
 95 }
 96 
 97 static int sta2x11_pdev_to_ep(struct pci_dev *pdev)
 98 {
 99         struct sta2x11_instance *instance;
100 
101         instance = sta2x11_pdev_to_instance(pdev);
102         if (!instance)
103                 return -1;
104 
105         return pdev->bus->number - instance->bus0;
106 }
107 
108 static struct sta2x11_mapping *sta2x11_pdev_to_mapping(struct pci_dev *pdev)
109 {
110         struct sta2x11_instance *instance;
111         int ep;
112 
113         instance = sta2x11_pdev_to_instance(pdev);
114         if (!instance)
115                 return NULL;
116         ep = sta2x11_pdev_to_ep(pdev);
117         return instance->map + ep;
118 }
119 
120 /* This is exported, as some devices need to access the MFD registers */
121 struct sta2x11_instance *sta2x11_get_instance(struct pci_dev *pdev)
122 {
123         return sta2x11_pdev_to_instance(pdev);
124 }
125 EXPORT_SYMBOL(sta2x11_get_instance);
126 
127 
128 /**
129  * p2a - Translate physical address to STA2x11 AMBA address,
130  *       used for DMA transfers to STA2x11
131  * @p: Physical address
132  * @pdev: PCI device (must be hosted within the connext)
133  */
134 static dma_addr_t p2a(dma_addr_t p, struct pci_dev *pdev)
135 {
136         struct sta2x11_mapping *map;
137         dma_addr_t a;
138 
139         map = sta2x11_pdev_to_mapping(pdev);
140         a = p + map->amba_base;
141         return a;
142 }
143 
144 /**
145  * a2p - Translate STA2x11 AMBA address to physical address
146  *       used for DMA transfers from STA2x11
147  * @a: STA2x11 AMBA address
148  * @pdev: PCI device (must be hosted within the connext)
149  */
150 static dma_addr_t a2p(dma_addr_t a, struct pci_dev *pdev)
151 {
152         struct sta2x11_mapping *map;
153         dma_addr_t p;
154 
155         map = sta2x11_pdev_to_mapping(pdev);
156         p = a - map->amba_base;
157         return p;
158 }
159 
160 /**
161  * sta2x11_swiotlb_alloc_coherent - Allocate swiotlb bounce buffers
162  *     returns virtual address. This is the only "special" function here.
163  * @dev: PCI device
164  * @size: Size of the buffer
165  * @dma_handle: DMA address
166  * @flags: memory flags
167  */
168 static void *sta2x11_swiotlb_alloc_coherent(struct device *dev,
169                                             size_t size,
170                                             dma_addr_t *dma_handle,
171                                             gfp_t flags,
172                                             struct dma_attrs *attrs)
173 {
174         void *vaddr;
175 
176         vaddr = x86_swiotlb_alloc_coherent(dev, size, dma_handle, flags, attrs);
177         *dma_handle = p2a(*dma_handle, to_pci_dev(dev));
178         return vaddr;
179 }
180 
181 /* We have our own dma_ops: the same as swiotlb but from alloc (above) */
182 static struct dma_map_ops sta2x11_dma_ops = {
183         .alloc = sta2x11_swiotlb_alloc_coherent,
184         .free = x86_swiotlb_free_coherent,
185         .map_page = swiotlb_map_page,
186         .unmap_page = swiotlb_unmap_page,
187         .map_sg = swiotlb_map_sg_attrs,
188         .unmap_sg = swiotlb_unmap_sg_attrs,
189         .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
190         .sync_single_for_device = swiotlb_sync_single_for_device,
191         .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
192         .sync_sg_for_device = swiotlb_sync_sg_for_device,
193         .mapping_error = swiotlb_dma_mapping_error,
194         .dma_supported = NULL, /* FIXME: we should use this instead! */
195 };
196 
197 /* At setup time, we use our own ops if the device is a ConneXt one */
198 static void sta2x11_setup_pdev(struct pci_dev *pdev)
199 {
200         struct sta2x11_instance *instance = sta2x11_pdev_to_instance(pdev);
201 
202         if (!instance) /* either a sta2x11 bridge or another ST device */
203                 return;
204         pci_set_consistent_dma_mask(pdev, STA2X11_AMBA_SIZE - 1);
205         pci_set_dma_mask(pdev, STA2X11_AMBA_SIZE - 1);
206         pdev->dev.archdata.dma_ops = &sta2x11_dma_ops;
207 
208         /* We must enable all devices as master, for audio DMA to work */
209         pci_set_master(pdev);
210 }
211 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, sta2x11_setup_pdev);
212 
213 /*
214  * The following three functions are exported (used in swiotlb: FIXME)
215  */
216 /**
217  * dma_capable - Check if device can manage DMA transfers (FIXME: kill it)
218  * @dev: device for a PCI device
219  * @addr: DMA address
220  * @size: DMA size
221  */
222 bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
223 {
224         struct sta2x11_mapping *map;
225 
226         if (dev->archdata.dma_ops != &sta2x11_dma_ops) {
227                 if (!dev->dma_mask)
228                         return false;
229                 return addr + size - 1 <= *dev->dma_mask;
230         }
231 
232         map = sta2x11_pdev_to_mapping(to_pci_dev(dev));
233 
234         if (!map || (addr < map->amba_base))
235                 return false;
236         if (addr + size >= map->amba_base + STA2X11_AMBA_SIZE) {
237                 return false;
238         }
239 
240         return true;
241 }
242 
243 /**
244  * phys_to_dma - Return the DMA AMBA address used for this STA2x11 device
245  * @dev: device for a PCI device
246  * @paddr: Physical address
247  */
248 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
249 {
250         if (dev->archdata.dma_ops != &sta2x11_dma_ops)
251                 return paddr;
252         return p2a(paddr, to_pci_dev(dev));
253 }
254 
255 /**
256  * dma_to_phys - Return the physical address used for this STA2x11 DMA address
257  * @dev: device for a PCI device
258  * @daddr: STA2x11 AMBA DMA address
259  */
260 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
261 {
262         if (dev->archdata.dma_ops != &sta2x11_dma_ops)
263                 return daddr;
264         return a2p(daddr, to_pci_dev(dev));
265 }
266 
267 
268 /*
269  * At boot we must set up the mappings for the pcie-to-amba bridge.
270  * It involves device access, and the same happens at suspend/resume time
271  */
272 
273 #define AHB_MAPB                0xCA4
274 #define AHB_CRW(i)              (AHB_MAPB + 0  + (i) * 0x10)
275 #define AHB_CRW_SZMASK                  0xfffffc00UL
276 #define AHB_CRW_ENABLE                  (1 << 0)
277 #define AHB_CRW_WTYPE_MEM               (2 << 1)
278 #define AHB_CRW_ROE                     (1UL << 3)      /* Relax Order Ena */
279 #define AHB_CRW_NSE                     (1UL << 4)      /* No Snoop Enable */
280 #define AHB_BASE(i)             (AHB_MAPB + 4  + (i) * 0x10)
281 #define AHB_PEXLBASE(i)         (AHB_MAPB + 8  + (i) * 0x10)
282 #define AHB_PEXHBASE(i)         (AHB_MAPB + 12 + (i) * 0x10)
283 
284 /* At probe time, enable mapping for each endpoint, using the pdev */
285 static void sta2x11_map_ep(struct pci_dev *pdev)
286 {
287         struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev);
288         int i;
289 
290         if (!map)
291                 return;
292         pci_read_config_dword(pdev, AHB_BASE(0), &map->amba_base);
293 
294         /* Configure AHB mapping */
295         pci_write_config_dword(pdev, AHB_PEXLBASE(0), 0);
296         pci_write_config_dword(pdev, AHB_PEXHBASE(0), 0);
297         pci_write_config_dword(pdev, AHB_CRW(0), STA2X11_AMBA_SIZE |
298                                AHB_CRW_WTYPE_MEM | AHB_CRW_ENABLE);
299 
300         /* Disable all the other windows */
301         for (i = 1; i < STA2X11_NR_FUNCS; i++)
302                 pci_write_config_dword(pdev, AHB_CRW(i), 0);
303 
304         dev_info(&pdev->dev,
305                  "sta2x11: Map EP %i: AMBA address %#8x-%#8x\n",
306                  sta2x11_pdev_to_ep(pdev),  map->amba_base,
307                  map->amba_base + STA2X11_AMBA_SIZE - 1);
308 }
309 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, sta2x11_map_ep);
310 
311 #ifdef CONFIG_PM /* Some register values must be saved and restored */
312 
313 static void suspend_mapping(struct pci_dev *pdev)
314 {
315         struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev);
316         int i;
317 
318         if (!map)
319                 return;
320 
321         if (map->is_suspended)
322                 return;
323         map->is_suspended = 1;
324 
325         /* Save all window configs */
326         for (i = 0; i < STA2X11_NR_FUNCS; i++) {
327                 struct sta2x11_ahb_regs *regs = map->regs + i;
328 
329                 pci_read_config_dword(pdev, AHB_BASE(i), &regs->base);
330                 pci_read_config_dword(pdev, AHB_PEXLBASE(i), &regs->pexlbase);
331                 pci_read_config_dword(pdev, AHB_PEXHBASE(i), &regs->pexhbase);
332                 pci_read_config_dword(pdev, AHB_CRW(i), &regs->crw);
333         }
334 }
335 DECLARE_PCI_FIXUP_SUSPEND(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, suspend_mapping);
336 
337 static void resume_mapping(struct pci_dev *pdev)
338 {
339         struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev);
340         int i;
341 
342         if (!map)
343                 return;
344 
345 
346         if (!map->is_suspended)
347                 goto out;
348         map->is_suspended = 0;
349 
350         /* Restore all window configs */
351         for (i = 0; i < STA2X11_NR_FUNCS; i++) {
352                 struct sta2x11_ahb_regs *regs = map->regs + i;
353 
354                 pci_write_config_dword(pdev, AHB_BASE(i), regs->base);
355                 pci_write_config_dword(pdev, AHB_PEXLBASE(i), regs->pexlbase);
356                 pci_write_config_dword(pdev, AHB_PEXHBASE(i), regs->pexhbase);
357                 pci_write_config_dword(pdev, AHB_CRW(i), regs->crw);
358         }
359 out:
360         pci_set_master(pdev); /* Like at boot, enable master on all devices */
361 }
362 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, resume_mapping);
363 
364 #endif /* CONFIG_PM */
365 

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