arch/x86/pci/sta2x11-fixup.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
sta2x11_new_instance
sta2x11_pdev_to_instance
sta2x11_pdev_to_ep
sta2x11_pdev_to_mapping
sta2x11_get_instance
p2a
a2p
sta2x11_setup_pdev
dma_capable
__phys_to_dma
__dma_to_phys
sta2x11_map_ep
suspend_mapping
resume_mapping
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * DMA translation between STA2x11 AMBA memory mapping and the x86 memory mapping
   4  *
   5  * ST Microelectronics ConneXt (STA2X11/STA2X10)
   6  *
   7  * Copyright (c) 2010-2011 Wind River Systems, Inc.
   8  */
   9 
  10 #include <linux/pci.h>
  11 #include <linux/pci_ids.h>
  12 #include <linux/export.h>
  13 #include <linux/list.h>
  14 #include <linux/dma-direct.h>
  15 #include <asm/iommu.h>
  16 
  17 #define STA2X11_SWIOTLB_SIZE (4*1024*1024)
  18 extern int swiotlb_late_init_with_default_size(size_t default_size);
  19 
  20 /*
  21  * We build a list of bus numbers that are under the ConneXt. The
  22  * main bridge hosts 4 busses, which are the 4 endpoints, in order.
  23  */
  24 #define STA2X11_NR_EP           4       /* 0..3 included */
  25 #define STA2X11_NR_FUNCS        8       /* 0..7 included */
  26 #define STA2X11_AMBA_SIZE       (512 << 20)
  27 
  28 struct sta2x11_ahb_regs { /* saved during suspend */
  29         u32 base, pexlbase, pexhbase, crw;
  30 };
  31 
  32 struct sta2x11_mapping {
  33         u32 amba_base;
  34         int is_suspended;
  35         struct sta2x11_ahb_regs regs[STA2X11_NR_FUNCS];
  36 };
  37 
  38 struct sta2x11_instance {
  39         struct list_head list;
  40         int bus0;
  41         struct sta2x11_mapping map[STA2X11_NR_EP];
  42 };
  43 
  44 static LIST_HEAD(sta2x11_instance_list);
  45 
  46 /* At probe time, record new instances of this bridge (likely one only) */
  47 static void sta2x11_new_instance(struct pci_dev *pdev)
  48 {
  49         struct sta2x11_instance *instance;
  50 
  51         instance = kzalloc(sizeof(*instance), GFP_ATOMIC);
  52         if (!instance)
  53                 return;
  54         /* This has a subordinate bridge, with 4 more-subordinate ones */
  55         instance->bus0 = pdev->subordinate->number + 1;
  56 
  57         if (list_empty(&sta2x11_instance_list)) {
  58                 int size = STA2X11_SWIOTLB_SIZE;
  59                 /* First instance: register your own swiotlb area */
  60                 dev_info(&pdev->dev, "Using SWIOTLB (size %i)\n", size);
  61                 if (swiotlb_late_init_with_default_size(size))
  62                         dev_emerg(&pdev->dev, "init swiotlb failed\n");
  63         }
  64         list_add(&instance->list, &sta2x11_instance_list);
  65 }
  66 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, 0xcc17, sta2x11_new_instance);
  67 
  68 /*
  69  * Utility functions used in this file from below
  70  */
  71 static struct sta2x11_instance *sta2x11_pdev_to_instance(struct pci_dev *pdev)
  72 {
  73         struct sta2x11_instance *instance;
  74         int ep;
  75 
  76         list_for_each_entry(instance, &sta2x11_instance_list, list) {
  77                 ep = pdev->bus->number - instance->bus0;
  78                 if (ep >= 0 && ep < STA2X11_NR_EP)
  79                         return instance;
  80         }
  81         return NULL;
  82 }
  83 
  84 static int sta2x11_pdev_to_ep(struct pci_dev *pdev)
  85 {
  86         struct sta2x11_instance *instance;
  87 
  88         instance = sta2x11_pdev_to_instance(pdev);
  89         if (!instance)
  90                 return -1;
  91 
  92         return pdev->bus->number - instance->bus0;
  93 }
  94 
  95 static struct sta2x11_mapping *sta2x11_pdev_to_mapping(struct pci_dev *pdev)
  96 {
  97         struct sta2x11_instance *instance;
  98         int ep;
  99 
 100         instance = sta2x11_pdev_to_instance(pdev);
 101         if (!instance)
 102                 return NULL;
 103         ep = sta2x11_pdev_to_ep(pdev);
 104         return instance->map + ep;
 105 }
 106 
 107 /* This is exported, as some devices need to access the MFD registers */
 108 struct sta2x11_instance *sta2x11_get_instance(struct pci_dev *pdev)
 109 {
 110         return sta2x11_pdev_to_instance(pdev);
 111 }
 112 EXPORT_SYMBOL(sta2x11_get_instance);
 113 
 114 
 115 /**
 116  * p2a - Translate physical address to STA2x11 AMBA address,
 117  *       used for DMA transfers to STA2x11
 118  * @p: Physical address
 119  * @pdev: PCI device (must be hosted within the connext)
 120  */
 121 static dma_addr_t p2a(dma_addr_t p, struct pci_dev *pdev)
 122 {
 123         struct sta2x11_mapping *map;
 124         dma_addr_t a;
 125 
 126         map = sta2x11_pdev_to_mapping(pdev);
 127         a = p + map->amba_base;
 128         return a;
 129 }
 130 
 131 /**
 132  * a2p - Translate STA2x11 AMBA address to physical address
 133  *       used for DMA transfers from STA2x11
 134  * @a: STA2x11 AMBA address
 135  * @pdev: PCI device (must be hosted within the connext)
 136  */
 137 static dma_addr_t a2p(dma_addr_t a, struct pci_dev *pdev)
 138 {
 139         struct sta2x11_mapping *map;
 140         dma_addr_t p;
 141 
 142         map = sta2x11_pdev_to_mapping(pdev);
 143         p = a - map->amba_base;
 144         return p;
 145 }
 146 
 147 /* At setup time, we use our own ops if the device is a ConneXt one */
 148 static void sta2x11_setup_pdev(struct pci_dev *pdev)
 149 {
 150         struct sta2x11_instance *instance = sta2x11_pdev_to_instance(pdev);
 151 
 152         if (!instance) /* either a sta2x11 bridge or another ST device */
 153                 return;
 154         pci_set_consistent_dma_mask(pdev, STA2X11_AMBA_SIZE - 1);
 155         pci_set_dma_mask(pdev, STA2X11_AMBA_SIZE - 1);
 156         pdev->dev.archdata.is_sta2x11 = true;
 157 
 158         /* We must enable all devices as master, for audio DMA to work */
 159         pci_set_master(pdev);
 160 }
 161 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, sta2x11_setup_pdev);
 162 
 163 /*
 164  * The following three functions are exported (used in swiotlb: FIXME)
 165  */
 166 /**
 167  * dma_capable - Check if device can manage DMA transfers (FIXME: kill it)
 168  * @dev: device for a PCI device
 169  * @addr: DMA address
 170  * @size: DMA size
 171  */
 172 bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 173 {
 174         struct sta2x11_mapping *map;
 175 
 176         if (!dev->archdata.is_sta2x11) {
 177                 if (!dev->dma_mask)
 178                         return false;
 179                 return addr + size - 1 <= *dev->dma_mask;
 180         }
 181 
 182         map = sta2x11_pdev_to_mapping(to_pci_dev(dev));
 183 
 184         if (!map || (addr < map->amba_base))
 185                 return false;
 186         if (addr + size >= map->amba_base + STA2X11_AMBA_SIZE) {
 187                 return false;
 188         }
 189 
 190         return true;
 191 }
 192 
 193 /**
 194  * __phys_to_dma - Return the DMA AMBA address used for this STA2x11 device
 195  * @dev: device for a PCI device
 196  * @paddr: Physical address
 197  */
 198 dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
 199 {
 200         if (!dev->archdata.is_sta2x11)
 201                 return paddr;
 202         return p2a(paddr, to_pci_dev(dev));
 203 }
 204 
 205 /**
 206  * dma_to_phys - Return the physical address used for this STA2x11 DMA address
 207  * @dev: device for a PCI device
 208  * @daddr: STA2x11 AMBA DMA address
 209  */
 210 phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr)
 211 {
 212         if (!dev->archdata.is_sta2x11)
 213                 return daddr;
 214         return a2p(daddr, to_pci_dev(dev));
 215 }
 216 
 217 
 218 /*
 219  * At boot we must set up the mappings for the pcie-to-amba bridge.
 220  * It involves device access, and the same happens at suspend/resume time
 221  */
 222 
 223 #define AHB_MAPB                0xCA4
 224 #define AHB_CRW(i)              (AHB_MAPB + 0  + (i) * 0x10)
 225 #define AHB_CRW_SZMASK                  0xfffffc00UL
 226 #define AHB_CRW_ENABLE                  (1 << 0)
 227 #define AHB_CRW_WTYPE_MEM               (2 << 1)
 228 #define AHB_CRW_ROE                     (1UL << 3)      /* Relax Order Ena */
 229 #define AHB_CRW_NSE                     (1UL << 4)      /* No Snoop Enable */
 230 #define AHB_BASE(i)             (AHB_MAPB + 4  + (i) * 0x10)
 231 #define AHB_PEXLBASE(i)         (AHB_MAPB + 8  + (i) * 0x10)
 232 #define AHB_PEXHBASE(i)         (AHB_MAPB + 12 + (i) * 0x10)
 233 
 234 /* At probe time, enable mapping for each endpoint, using the pdev */
 235 static void sta2x11_map_ep(struct pci_dev *pdev)
 236 {
 237         struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev);
 238         int i;
 239 
 240         if (!map)
 241                 return;
 242         pci_read_config_dword(pdev, AHB_BASE(0), &map->amba_base);
 243 
 244         /* Configure AHB mapping */
 245         pci_write_config_dword(pdev, AHB_PEXLBASE(0), 0);
 246         pci_write_config_dword(pdev, AHB_PEXHBASE(0), 0);
 247         pci_write_config_dword(pdev, AHB_CRW(0), STA2X11_AMBA_SIZE |
 248                                AHB_CRW_WTYPE_MEM | AHB_CRW_ENABLE);
 249 
 250         /* Disable all the other windows */
 251         for (i = 1; i < STA2X11_NR_FUNCS; i++)
 252                 pci_write_config_dword(pdev, AHB_CRW(i), 0);
 253 
 254         dev_info(&pdev->dev,
 255                  "sta2x11: Map EP %i: AMBA address %#8x-%#8x\n",
 256                  sta2x11_pdev_to_ep(pdev),  map->amba_base,
 257                  map->amba_base + STA2X11_AMBA_SIZE - 1);
 258 }
 259 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, sta2x11_map_ep);
 260 
 261 #ifdef CONFIG_PM /* Some register values must be saved and restored */
 262 
 263 static void suspend_mapping(struct pci_dev *pdev)
 264 {
 265         struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev);
 266         int i;
 267 
 268         if (!map)
 269                 return;
 270 
 271         if (map->is_suspended)
 272                 return;
 273         map->is_suspended = 1;
 274 
 275         /* Save all window configs */
 276         for (i = 0; i < STA2X11_NR_FUNCS; i++) {
 277                 struct sta2x11_ahb_regs *regs = map->regs + i;
 278 
 279                 pci_read_config_dword(pdev, AHB_BASE(i), &regs->base);
 280                 pci_read_config_dword(pdev, AHB_PEXLBASE(i), &regs->pexlbase);
 281                 pci_read_config_dword(pdev, AHB_PEXHBASE(i), &regs->pexhbase);
 282                 pci_read_config_dword(pdev, AHB_CRW(i), &regs->crw);
 283         }
 284 }
 285 DECLARE_PCI_FIXUP_SUSPEND(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, suspend_mapping);
 286 
 287 static void resume_mapping(struct pci_dev *pdev)
 288 {
 289         struct sta2x11_mapping *map = sta2x11_pdev_to_mapping(pdev);
 290         int i;
 291 
 292         if (!map)
 293                 return;
 294 
 295 
 296         if (!map->is_suspended)
 297                 goto out;
 298         map->is_suspended = 0;
 299 
 300         /* Restore all window configs */
 301         for (i = 0; i < STA2X11_NR_FUNCS; i++) {
 302                 struct sta2x11_ahb_regs *regs = map->regs + i;
 303 
 304                 pci_write_config_dword(pdev, AHB_BASE(i), regs->base);
 305                 pci_write_config_dword(pdev, AHB_PEXLBASE(i), regs->pexlbase);
 306                 pci_write_config_dword(pdev, AHB_PEXHBASE(i), regs->pexhbase);
 307                 pci_write_config_dword(pdev, AHB_CRW(i), regs->crw);
 308         }
 309 out:
 310         pci_set_master(pdev); /* Like at boot, enable master on all devices */
 311 }
 312 DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, resume_mapping);
 313 
 314 #endif /* CONFIG_PM */
/* [<][>][^][v][top][bottom][index][help] */
root/arch/x86/pci/sta2x11-fixup.c

DEFINITIONS
