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Linux/arch/powerpc/kernel/isa-bridge.c

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  1 /*
  2  * Routines for tracking a legacy ISA bridge
  3  *
  4  * Copyrigh 2007 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
  5  *
  6  * Some bits and pieces moved over from pci_64.c
  7  *
  8  * Copyrigh 2003 Anton Blanchard <anton@au.ibm.com>, IBM Corp.
  9  *
 10  *      This program is free software; you can redistribute it and/or
 11  *      modify it under the terms of the GNU General Public License
 12  *      as published by the Free Software Foundation; either version
 13  *      2 of the License, or (at your option) any later version.
 14  */
 15 
 16 #define DEBUG
 17 
 18 #include <linux/kernel.h>
 19 #include <linux/pci.h>
 20 #include <linux/string.h>
 21 #include <linux/export.h>
 22 #include <linux/init.h>
 23 #include <linux/mm.h>
 24 #include <linux/notifier.h>
 25 
 26 #include <asm/processor.h>
 27 #include <asm/io.h>
 28 #include <asm/prom.h>
 29 #include <asm/pci-bridge.h>
 30 #include <asm/machdep.h>
 31 #include <asm/ppc-pci.h>
 32 
 33 unsigned long isa_io_base;      /* NULL if no ISA bus */
 34 EXPORT_SYMBOL(isa_io_base);
 35 
 36 /* Cached ISA bridge dev. */
 37 static struct device_node *isa_bridge_devnode;
 38 struct pci_dev *isa_bridge_pcidev;
 39 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
 40 
 41 #define ISA_SPACE_MASK 0x1
 42 #define ISA_SPACE_IO 0x1
 43 
 44 static void pci_process_ISA_OF_ranges(struct device_node *isa_node,
 45                                       unsigned long phb_io_base_phys)
 46 {
 47         /* We should get some saner parsing here and remove these structs */
 48         struct pci_address {
 49                 u32 a_hi;
 50                 u32 a_mid;
 51                 u32 a_lo;
 52         };
 53 
 54         struct isa_address {
 55                 u32 a_hi;
 56                 u32 a_lo;
 57         };
 58 
 59         struct isa_range {
 60                 struct isa_address isa_addr;
 61                 struct pci_address pci_addr;
 62                 unsigned int size;
 63         };
 64 
 65         const struct isa_range *range;
 66         unsigned long pci_addr;
 67         unsigned int isa_addr;
 68         unsigned int size;
 69         int rlen = 0;
 70 
 71         range = of_get_property(isa_node, "ranges", &rlen);
 72         if (range == NULL || (rlen < sizeof(struct isa_range)))
 73                 goto inval_range;
 74 
 75         /* From "ISA Binding to 1275"
 76          * The ranges property is laid out as an array of elements,
 77          * each of which comprises:
 78          *   cells 0 - 1:       an ISA address
 79          *   cells 2 - 4:       a PCI address
 80          *                      (size depending on dev->n_addr_cells)
 81          *   cell 5:            the size of the range
 82          */
 83         if ((range->isa_addr.a_hi & ISA_SPACE_MASK) != ISA_SPACE_IO) {
 84                 range++;
 85                 rlen -= sizeof(struct isa_range);
 86                 if (rlen < sizeof(struct isa_range))
 87                         goto inval_range;
 88         }
 89         if ((range->isa_addr.a_hi & ISA_SPACE_MASK) != ISA_SPACE_IO)
 90                 goto inval_range;
 91 
 92         isa_addr = range->isa_addr.a_lo;
 93         pci_addr = (unsigned long) range->pci_addr.a_mid << 32 |
 94                 range->pci_addr.a_lo;
 95 
 96         /* Assume these are both zero. Note: We could fix that and
 97          * do a proper parsing instead ... oh well, that will do for
 98          * now as nobody uses fancy mappings for ISA bridges
 99          */
100         if ((pci_addr != 0) || (isa_addr != 0)) {
101                 printk(KERN_ERR "unexpected isa to pci mapping: %s\n",
102                        __func__);
103                 return;
104         }
105 
106         /* Align size and make sure it's cropped to 64K */
107         size = PAGE_ALIGN(range->size);
108         if (size > 0x10000)
109                 size = 0x10000;
110 
111         __ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE,
112                      size, _PAGE_NO_CACHE|_PAGE_GUARDED);
113         return;
114 
115 inval_range:
116         printk(KERN_ERR "no ISA IO ranges or unexpected isa range, "
117                "mapping 64k\n");
118         __ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE,
119                      0x10000, _PAGE_NO_CACHE|_PAGE_GUARDED);
120 }
121 
122 
123 /**
124  * isa_bridge_find_early - Find and map the ISA IO space early before
125  *                         main PCI discovery. This is optionally called by
126  *                         the arch code when adding PCI PHBs to get early
127  *                         access to ISA IO ports
128  */
129 void __init isa_bridge_find_early(struct pci_controller *hose)
130 {
131         struct device_node *np, *parent = NULL, *tmp;
132 
133         /* If we already have an ISA bridge, bail off */
134         if (isa_bridge_devnode != NULL)
135                 return;
136 
137         /* For each "isa" node in the system. Note : we do a search by
138          * type and not by name. It might be better to do by name but that's
139          * what the code used to do and I don't want to break too much at
140          * once. We can look into changing that separately
141          */
142         for_each_node_by_type(np, "isa") {
143                 /* Look for our hose being a parent */
144                 for (parent = of_get_parent(np); parent;) {
145                         if (parent == hose->dn) {
146                                 of_node_put(parent);
147                                 break;
148                         }
149                         tmp = parent;
150                         parent = of_get_parent(parent);
151                         of_node_put(tmp);
152                 }
153                 if (parent != NULL)
154                         break;
155         }
156         if (np == NULL)
157                 return;
158         isa_bridge_devnode = np;
159 
160         /* Now parse the "ranges" property and setup the ISA mapping */
161         pci_process_ISA_OF_ranges(np, hose->io_base_phys);
162 
163         /* Set the global ISA io base to indicate we have an ISA bridge */
164         isa_io_base = ISA_IO_BASE;
165 
166         pr_debug("ISA bridge (early) is %s\n", np->full_name);
167 }
168 
169 /**
170  * isa_bridge_find_late - Find and map the ISA IO space upon discovery of
171  *                        a new ISA bridge
172  */
173 static void isa_bridge_find_late(struct pci_dev *pdev,
174                                  struct device_node *devnode)
175 {
176         struct pci_controller *hose = pci_bus_to_host(pdev->bus);
177 
178         /* Store ISA device node and PCI device */
179         isa_bridge_devnode = of_node_get(devnode);
180         isa_bridge_pcidev = pdev;
181 
182         /* Now parse the "ranges" property and setup the ISA mapping */
183         pci_process_ISA_OF_ranges(devnode, hose->io_base_phys);
184 
185         /* Set the global ISA io base to indicate we have an ISA bridge */
186         isa_io_base = ISA_IO_BASE;
187 
188         pr_debug("ISA bridge (late) is %s on %s\n",
189                  devnode->full_name, pci_name(pdev));
190 }
191 
192 /**
193  * isa_bridge_remove - Remove/unmap an ISA bridge
194  */
195 static void isa_bridge_remove(void)
196 {
197         pr_debug("ISA bridge removed !\n");
198 
199         /* Clear the global ISA io base to indicate that we have no more
200          * ISA bridge. Note that drivers don't quite handle that, though
201          * we should probably do something about it. But do we ever really
202          * have ISA bridges being removed on machines using legacy devices ?
203          */
204         isa_io_base = ISA_IO_BASE;
205 
206         /* Clear references to the bridge */
207         of_node_put(isa_bridge_devnode);
208         isa_bridge_devnode = NULL;
209         isa_bridge_pcidev = NULL;
210 
211         /* Unmap the ISA area */
212         __iounmap_at((void *)ISA_IO_BASE, 0x10000);
213 }
214 
215 /**
216  * isa_bridge_notify - Get notified of PCI devices addition/removal
217  */
218 static int isa_bridge_notify(struct notifier_block *nb, unsigned long action,
219                              void *data)
220 {
221         struct device *dev = data;
222         struct pci_dev *pdev = to_pci_dev(dev);
223         struct device_node *devnode = pci_device_to_OF_node(pdev);
224 
225         switch(action) {
226         case BUS_NOTIFY_ADD_DEVICE:
227                 /* Check if we have an early ISA device, without PCI dev */
228                 if (isa_bridge_devnode && isa_bridge_devnode == devnode &&
229                     !isa_bridge_pcidev) {
230                         pr_debug("ISA bridge PCI attached: %s\n",
231                                  pci_name(pdev));
232                         isa_bridge_pcidev = pdev;
233                 }
234 
235                 /* Check if we have no ISA device, and this happens to be one,
236                  * register it as such if it has an OF device
237                  */
238                 if (!isa_bridge_devnode && devnode && devnode->type &&
239                     !strcmp(devnode->type, "isa"))
240                         isa_bridge_find_late(pdev, devnode);
241 
242                 return 0;
243         case BUS_NOTIFY_DEL_DEVICE:
244                 /* Check if this our existing ISA device */
245                 if (pdev == isa_bridge_pcidev ||
246                     (devnode && devnode == isa_bridge_devnode))
247                         isa_bridge_remove();
248                 return 0;
249         }
250         return 0;
251 }
252 
253 static struct notifier_block isa_bridge_notifier = {
254         .notifier_call = isa_bridge_notify
255 };
256 
257 /**
258  * isa_bridge_init - register to be notified of ISA bridge addition/removal
259  *
260  */
261 static int __init isa_bridge_init(void)
262 {
263         bus_register_notifier(&pci_bus_type, &isa_bridge_notifier);
264         return 0;
265 }
266 arch_initcall(isa_bridge_init);
267 

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