Linux 4.6-rc6
[linux/fpc-iii.git] / arch / x86 / pci / sta2x11-fixup.c
blob5ceda85b86871727668a3a3a77484cd0fb8b4187
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
6 * ST Microelectronics ConneXt (STA2X11/STA2X10)
8 * Copyright (c) 2010-2011 Wind River Systems, Inc.
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.
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.
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
25 #include <linux/pci.h>
26 #include <linux/pci_ids.h>
27 #include <linux/export.h>
28 #include <linux/list.h>
30 #define STA2X11_SWIOTLB_SIZE (4*1024*1024)
31 extern int swiotlb_late_init_with_default_size(size_t default_size);
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.
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)
41 struct sta2x11_ahb_regs { /* saved during suspend */
42 u32 base, pexlbase, pexhbase, crw;
45 struct sta2x11_mapping {
46 u32 amba_base;
47 int is_suspended;
48 struct sta2x11_ahb_regs regs[STA2X11_NR_FUNCS];
51 struct sta2x11_instance {
52 struct list_head list;
53 int bus0;
54 struct sta2x11_mapping map[STA2X11_NR_EP];
57 static LIST_HEAD(sta2x11_instance_list);
59 /* At probe time, record new instances of this bridge (likely one only) */
60 static void sta2x11_new_instance(struct pci_dev *pdev)
62 struct sta2x11_instance *instance;
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;
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");
77 list_add(&instance->list, &sta2x11_instance_list);
79 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, 0xcc17, sta2x11_new_instance);
82 * Utility functions used in this file from below
84 static struct sta2x11_instance *sta2x11_pdev_to_instance(struct pci_dev *pdev)
86 struct sta2x11_instance *instance;
87 int ep;
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;
94 return NULL;
97 static int sta2x11_pdev_to_ep(struct pci_dev *pdev)
99 struct sta2x11_instance *instance;
101 instance = sta2x11_pdev_to_instance(pdev);
102 if (!instance)
103 return -1;
105 return pdev->bus->number - instance->bus0;
108 static struct sta2x11_mapping *sta2x11_pdev_to_mapping(struct pci_dev *pdev)
110 struct sta2x11_instance *instance;
111 int ep;
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;
120 /* This is exported, as some devices need to access the MFD registers */
121 struct sta2x11_instance *sta2x11_get_instance(struct pci_dev *pdev)
123 return sta2x11_pdev_to_instance(pdev);
125 EXPORT_SYMBOL(sta2x11_get_instance);
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)
134 static dma_addr_t p2a(dma_addr_t p, struct pci_dev *pdev)
136 struct sta2x11_mapping *map;
137 dma_addr_t a;
139 map = sta2x11_pdev_to_mapping(pdev);
140 a = p + map->amba_base;
141 return a;
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)
150 static dma_addr_t a2p(dma_addr_t a, struct pci_dev *pdev)
152 struct sta2x11_mapping *map;
153 dma_addr_t p;
155 map = sta2x11_pdev_to_mapping(pdev);
156 p = a - map->amba_base;
157 return p;
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
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)
174 void *vaddr;
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;
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! */
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)
200 struct sta2x11_instance *instance = sta2x11_pdev_to_instance(pdev);
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;
208 /* We must enable all devices as master, for audio DMA to work */
209 pci_set_master(pdev);
211 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, sta2x11_setup_pdev);
214 * The following three functions are exported (used in swiotlb: FIXME)
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
222 bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
224 struct sta2x11_mapping *map;
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;
232 map = sta2x11_pdev_to_mapping(to_pci_dev(dev));
234 if (!map || (addr < map->amba_base))
235 return false;
236 if (addr + size >= map->amba_base + STA2X11_AMBA_SIZE) {
237 return false;
240 return true;
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
248 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
250 if (dev->archdata.dma_ops != &sta2x11_dma_ops)
251 return paddr;
252 return p2a(paddr, to_pci_dev(dev));
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
260 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
262 if (dev->archdata.dma_ops != &sta2x11_dma_ops)
263 return daddr;
264 return a2p(daddr, to_pci_dev(dev));
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
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)
284 /* At probe time, enable mapping for each endpoint, using the pdev */
285 static void sta2x11_map_ep(struct pci_dev *pdev)
287 struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev);
288 int i;
290 if (!map)
291 return;
292 pci_read_config_dword(pdev, AHB_BASE(0), &map->amba_base);
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);
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);
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);
309 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, sta2x11_map_ep);
311 #ifdef CONFIG_PM /* Some register values must be saved and restored */
313 static void suspend_mapping(struct pci_dev *pdev)
315 struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev);
316 int i;
318 if (!map)
319 return;
321 if (map->is_suspended)
322 return;
323 map->is_suspended = 1;
325 /* Save all window configs */
326 for (i = 0; i < STA2X11_NR_FUNCS; i++) {
327 struct sta2x11_ahb_regs *regs = map->regs + i;
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);
335 DECLARE_PCI_FIXUP_SUSPEND(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, suspend_mapping);
337 static void resume_mapping(struct pci_dev *pdev)
339 struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev);
340 int i;
342 if (!map)
343 return;
346 if (!map->is_suspended)
347 goto out;
348 map->is_suspended = 0;
350 /* Restore all window configs */
351 for (i = 0; i < STA2X11_NR_FUNCS; i++) {
352 struct sta2x11_ahb_regs *regs = map->regs + i;
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);
359 out:
360 pci_set_master(pdev); /* Like at boot, enable master on all devices */
362 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, resume_mapping);
364 #endif /* CONFIG_PM */