1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Routines for tracking a legacy ISA bridge
26 #include <asm/pci-bridge.h>
28 #include <asm/ppc-pci.h>
29 #include <asm/isa-bridge.h>
31 unsigned long isa_io_base;	/* NULL if no ISA bus */
34 /* Cached ISA bridge dev. */
89 	/* From "ISA Binding to 1275"  in pci_process_ISA_OF_ranges()
92 	 *   cells 0 - 1:	an ISA address  in pci_process_ISA_OF_ranges()
93 	 *   cells 2 - 4:	a PCI address  in pci_process_ISA_OF_ranges()
94 	 *			(size depending on dev->n_addr_cells)  in pci_process_ISA_OF_ranges()
97 	if ((range->isa_addr.a_hi & ISA_SPACE_MASK) != ISA_SPACE_IO) {  in pci_process_ISA_OF_ranges()
99 		rlen -= sizeof(struct isa_range);  in pci_process_ISA_OF_ranges()
103 	if ((range->isa_addr.a_hi & ISA_SPACE_MASK) != ISA_SPACE_IO)  in pci_process_ISA_OF_ranges()
106 	isa_addr = range->isa_addr.a_lo;  in pci_process_ISA_OF_ranges()
107 	pci_addr = (unsigned long) range->pci_addr.a_mid << 32 |  in pci_process_ISA_OF_ranges()
108 		range->pci_addr.a_lo;  in pci_process_ISA_OF_ranges()
112 	 * now as nobody uses fancy mappings for ISA bridges  in pci_process_ISA_OF_ranges()
115 		printk(KERN_ERR "unexpected isa to pci mapping: %s\n",  in pci_process_ISA_OF_ranges()
121 	size = PAGE_ALIGN(range->size);  in pci_process_ISA_OF_ranges()
129 	printk(KERN_ERR "no ISA IO ranges or unexpected isa range, "  in pci_process_ISA_OF_ranges()
136  * isa_bridge_find_early - Find and map the ISA IO space early before
139  *                         access to ISA IO ports
145 	/* If we already have an ISA bridge, bail off */  in isa_bridge_find_early()
149 	/* For each "isa" node in the system. Note : we do a search by  in isa_bridge_find_early()
154 	for_each_node_by_type(np, "isa") {  in isa_bridge_find_early()
157 			if (parent == hose->dn) {  in isa_bridge_find_early()
172 	/* Now parse the "ranges" property and setup the ISA mapping */  in isa_bridge_find_early()
173 	pci_process_ISA_OF_ranges(np, hose->io_base_phys);  in isa_bridge_find_early()
175 	/* Set the global ISA io base to indicate we have an ISA bridge */  in isa_bridge_find_early()
178 	pr_debug("ISA bridge (early) is %pOF\n", np);  in isa_bridge_find_early()
182  * isa_bridge_find_early - Find and map the ISA IO space early before
185  *                         access to ISA IO ports
194 	/* If we already have an ISA bridge, bail off */  in isa_bridge_init_non_pci()
199 	if (of_property_read_u32(np, "#address-cells", &na) ||  in isa_bridge_init_non_pci()
200 	    of_property_read_u32(np, "#size-cells", &ns)) {  in isa_bridge_init_non_pci()
201 		pr_warn("ISA: Non-PCI bridge %pOF is missing address format\n",  in isa_bridge_init_non_pci()
208 		pr_warn("ISA: Non-PCI bridge %pOF has unsupported address format\n",  in isa_bridge_init_non_pci()
217 		pr_warn("ISA: Non-PCI bridge %pOF has absent or invalid ranges\n",  in isa_bridge_init_non_pci()
223 	for (i = 0; (i + rs - 1) < rlen; i += rs) {  in isa_bridge_init_non_pci()
234 		pr_warn("ISA: Non-PCI bridge %pOF has no usable IO range\n",  in isa_bridge_init_non_pci()
247 		pr_warn("ISA: Non-PCI bridge %pOF failed to translate IO base\n",  in isa_bridge_init_non_pci()
254 		pr_warn("ISA: Non-PCI bridge %pOF has non aligned IO range\n",  in isa_bridge_init_non_pci()
262 	/* Set the global ISA io base to indicate we have an ISA bridge  in isa_bridge_init_non_pci()
268 	pr_debug("ISA: Non-PCI bridge is %pOF\n", np);  in isa_bridge_init_non_pci()
272  * isa_bridge_find_late - Find and map the ISA IO space upon discovery of
273  *                        a new ISA bridge
278 	struct pci_controller *hose = pci_bus_to_host(pdev->bus);  in isa_bridge_find_late()
280 	/* Store ISA device node and PCI device */  in isa_bridge_find_late()
284 	/* Now parse the "ranges" property and setup the ISA mapping */  in isa_bridge_find_late()
285 	pci_process_ISA_OF_ranges(devnode, hose->io_base_phys);  in isa_bridge_find_late()
287 	/* Set the global ISA io base to indicate we have an ISA bridge */  in isa_bridge_find_late()
290 	pr_debug("ISA bridge (late) is %pOF on %s\n",  in isa_bridge_find_late()
295  * isa_bridge_remove - Remove/unmap an ISA bridge
299 	pr_debug("ISA bridge removed !\n");  in isa_bridge_remove()
301 	/* Clear the global ISA io base to indicate that we have no more  in isa_bridge_remove()
302 	 * ISA bridge. Note that drivers don't quite handle that, though  in isa_bridge_remove()
304 	 * have ISA bridges being removed on machines using legacy devices ?  in isa_bridge_remove()
313 	/* Unmap the ISA area */  in isa_bridge_remove()
318  * isa_bridge_notify - Get notified of PCI devices addition/removal
329 		/* Check if we have an early ISA device, without PCI dev */  in isa_bridge_notify()
332 			pr_debug("ISA bridge PCI attached: %s\n",  in isa_bridge_notify()
337 		/* Check if we have no ISA device, and this happens to be one,  in isa_bridge_notify()
340 		if (!isa_bridge_devnode && of_node_is_type(devnode, "isa"))  in isa_bridge_notify()
345 		/* Check if this our existing ISA device */  in isa_bridge_notify()
359  * isa_bridge_init - register to be notified of ISA bridge addition/removal