[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / powerpc / kernel / isa-bridge.c

/*
 * Routines for tracking a legacy ISA bridge
 *
 * Copyrigh 2007 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
 *
 * Some bits and pieces moved over from pci_64.c
 *
 * Copyrigh 2003 Anton Blanchard <anton@au.ibm.com>, IBM Corp.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#define DEBUG

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/notifier.h>

#include <asm/processor.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/ppc-pci.h>
#include <asm/firmware.h>

unsigned long isa_io_base;	/* NULL if no ISA bus */
EXPORT_SYMBOL(isa_io_base);

/* Cached ISA bridge dev. */
static struct device_node *isa_bridge_devnode;
struct pci_dev *isa_bridge_pcidev;
EXPORT_SYMBOL_GPL(isa_bridge_pcidev);

#define ISA_SPACE_MASK 0x1
#define ISA_SPACE_IO 0x1

static void __devinit pci_process_ISA_OF_ranges(struct device_node *isa_node,
						unsigned long phb_io_base_phys)
{
	/* We should get some saner parsing here and remove these structs */
	struct pci_address {
		u32 a_hi;
		u32 a_mid;
		u32 a_lo;
	};

	struct isa_address {
		u32 a_hi;
		u32 a_lo;
	};

	struct isa_range {
		struct isa_address isa_addr;
		struct pci_address pci_addr;
		unsigned int size;
	};

	const struct isa_range *range;
	unsigned long pci_addr;
	unsigned int isa_addr;
	unsigned int size;
	int rlen = 0;

	range = of_get_property(isa_node, "ranges", &rlen);
	if (range == NULL || (rlen < sizeof(struct isa_range)))
		goto inval_range;

	/* From "ISA Binding to 1275"
	 * The ranges property is laid out as an array of elements,
	 * each of which comprises:
	 *   cells 0 - 1:	an ISA address
	 *   cells 2 - 4:	a PCI address
	 *			(size depending on dev->n_addr_cells)
	 *   cell 5:		the size of the range
	 */
	if ((range->isa_addr.a_hi && ISA_SPACE_MASK) != ISA_SPACE_IO) {
		range++;
		rlen -= sizeof(struct isa_range);
		if (rlen < sizeof(struct isa_range))
			goto inval_range;
	}
	if ((range->isa_addr.a_hi && ISA_SPACE_MASK) != ISA_SPACE_IO)
		goto inval_range;

	isa_addr = range->isa_addr.a_lo;
	pci_addr = (unsigned long) range->pci_addr.a_mid << 32 |
		range->pci_addr.a_lo;

	/* Assume these are both zero. Note: We could fix that and
	 * do a proper parsing instead ... oh well, that will do for
	 * now as nobody uses fancy mappings for ISA bridges
	 */
	if ((pci_addr != 0) || (isa_addr != 0)) {
		printk(KERN_ERR "unexpected isa to pci mapping: %s\n",
		       __FUNCTION__);
		return;
	}

	/* Align size and make sure it's cropped to 64K */
	size = PAGE_ALIGN(range->size);
	if (size > 0x10000)
		size = 0x10000;

	printk(KERN_ERR "no ISA IO ranges or unexpected isa range, "
	       "mapping 64k\n");

	__ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE,
		     size, _PAGE_NO_CACHE|_PAGE_GUARDED);
	return;

inval_range:
	printk(KERN_ERR "no ISA IO ranges or unexpected isa range, "
	       "mapping 64k\n");
	__ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE,
		     0x10000, _PAGE_NO_CACHE|_PAGE_GUARDED);
}


/**
 * isa_bridge_find_early - Find and map the ISA IO space early before
 *                         main PCI discovery. This is optionally called by
 *                         the arch code when adding PCI PHBs to get early
 *                         access to ISA IO ports
 */
void __init isa_bridge_find_early(struct pci_controller *hose)
{
	struct device_node *np, *parent = NULL, *tmp;

	/* If we already have an ISA bridge, bail off */
	if (isa_bridge_devnode != NULL)
		return;

	/* For each "isa" node in the system. Note : we do a search by
	 * type and not by name. It might be better to do by name but that's
	 * what the code used to do and I don't want to break too much at
	 * once. We can look into changing that separately
	 */
	for_each_node_by_type(np, "isa") {
		/* Look for our hose being a parent */
		for (parent = of_get_parent(np); parent;) {
			if (parent == hose->dn) {
				of_node_put(parent);
				break;
			}
			tmp = parent;
			parent = of_get_parent(parent);
			of_node_put(tmp);
		}
		if (parent != NULL)
			break;
	}
	if (np == NULL)
		return;
	isa_bridge_devnode = np;

	/* Now parse the "ranges" property and setup the ISA mapping */
	pci_process_ISA_OF_ranges(np, hose->io_base_phys);

	/* Set the global ISA io base to indicate we have an ISA bridge */
	isa_io_base = ISA_IO_BASE;

	pr_debug("ISA bridge (early) is %s\n", np->full_name);
}

/**
 * isa_bridge_find_late - Find and map the ISA IO space upon discovery of
 *                        a new ISA bridge
 */
static void __devinit isa_bridge_find_late(struct pci_dev *pdev,
					   struct device_node *devnode)
{
	struct pci_controller *hose = pci_bus_to_host(pdev->bus);

	/* Store ISA device node and PCI device */
	isa_bridge_devnode = of_node_get(devnode);
	isa_bridge_pcidev = pdev;

	/* Now parse the "ranges" property and setup the ISA mapping */
	pci_process_ISA_OF_ranges(devnode, hose->io_base_phys);

	/* Set the global ISA io base to indicate we have an ISA bridge */
	isa_io_base = ISA_IO_BASE;

	pr_debug("ISA bridge (late) is %s on %s\n",
		 devnode->full_name, pci_name(pdev));
}

/**
 * isa_bridge_remove - Remove/unmap an ISA bridge
 */
static void isa_bridge_remove(void)
{
	pr_debug("ISA bridge removed !\n");

	/* Clear the global ISA io base to indicate that we have no more
	 * ISA bridge. Note that drivers don't quite handle that, though
	 * we should probably do something about it. But do we ever really
	 * have ISA bridges being removed on machines using legacy devices ?
	 */
	isa_io_base = ISA_IO_BASE;

	/* Clear references to the bridge */
	of_node_put(isa_bridge_devnode);
	isa_bridge_devnode = NULL;
	isa_bridge_pcidev = NULL;

	/* Unmap the ISA area */
	__iounmap_at((void *)ISA_IO_BASE, 0x10000);
}

/**
 * isa_bridge_notify - Get notified of PCI devices addition/removal
 */
static int __devinit isa_bridge_notify(struct notifier_block *nb,
				       unsigned long action, void *data)
{
	struct device *dev = data;
	struct pci_dev *pdev = to_pci_dev(dev);
	struct device_node *devnode = pci_device_to_OF_node(pdev);

	switch(action) {
	case BUS_NOTIFY_ADD_DEVICE:
		/* Check if we have an early ISA device, without PCI dev */
		if (isa_bridge_devnode && isa_bridge_devnode == devnode &&
		    !isa_bridge_pcidev) {
			pr_debug("ISA bridge PCI attached: %s\n",
				 pci_name(pdev));
			isa_bridge_pcidev = pdev;
		}

		/* Check if we have no ISA device, and this happens to be one,
		 * register it as such if it has an OF device
		 */
		if (!isa_bridge_devnode && devnode && devnode->type &&
		    !strcmp(devnode->type, "isa"))
			isa_bridge_find_late(pdev, devnode);

		return 0;
	case BUS_NOTIFY_DEL_DEVICE:
		/* Check if this our existing ISA device */
		if (pdev == isa_bridge_pcidev ||
		    (devnode && devnode == isa_bridge_devnode))
			isa_bridge_remove();
		return 0;
	}
	return 0;
}

static struct notifier_block isa_bridge_notifier = {
	.notifier_call = isa_bridge_notify
};

/**
 * isa_bridge_init - register to be notified of ISA bridge addition/removal
 *
 */
static int __init isa_bridge_init(void)
{
	if (firmware_has_feature(FW_FEATURE_ISERIES))
		return 0;
	bus_register_notifier(&pci_bus_type, &isa_bridge_notifier);
	return 0;
}
arch_initcall(isa_bridge_init);
Commit	Line	Data
3d5134ee BH	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/init.h>
	22	#include <linux/mm.h>
	23	#include <linux/notifier.h>
	24
	25	#include <asm/processor.h>
	26	#include <asm/io.h>
	27	#include <asm/prom.h>
	28	#include <asm/pci-bridge.h>
	29	#include <asm/machdep.h>
	30	#include <asm/ppc-pci.h>
	31	#include <asm/firmware.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 __devinit 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	__FUNCTION__);
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
df3c9019	111	printk(KERN_ERR "no ISA IO ranges or unexpected isa range, "
3d5134ee BH	112	"mapping 64k\n");
	113
	114	__ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE,
	115	size, _PAGE_NO_CACHE\|_PAGE_GUARDED);
	116	return;
	117
	118	inval_range:
df3c9019	119	printk(KERN_ERR "no ISA IO ranges or unexpected isa range, "
3d5134ee BH	120	"mapping 64k\n");
	121	__ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE,
	122	0x10000, _PAGE_NO_CACHE\|_PAGE_GUARDED);
	123	}
	124
	125
	126	/**
	127	* isa_bridge_find_early - Find and map the ISA IO space early before
	128	* main PCI discovery. This is optionally called by
	129	* the arch code when adding PCI PHBs to get early
	130	* access to ISA IO ports
	131	*/
	132	void __init isa_bridge_find_early(struct pci_controller *hose)
	133	{
	134	struct device_node np, parent = NULL, *tmp;
	135
	136	/* If we already have an ISA bridge, bail off */
	137	if (isa_bridge_devnode != NULL)
	138	return;
	139
	140	/* For each "isa" node in the system. Note : we do a search by
	141	* type and not by name. It might be better to do by name but that's
	142	* what the code used to do and I don't want to break too much at
	143	* once. We can look into changing that separately
	144	*/
	145	for_each_node_by_type(np, "isa") {
	146	/* Look for our hose being a parent */
	147	for (parent = of_get_parent(np); parent;) {
44ef3390	148	if (parent == hose->dn) {
3d5134ee BH	149	of_node_put(parent);
	150	break;
	151	}
	152	tmp = parent;
	153	parent = of_get_parent(parent);
	154	of_node_put(tmp);
	155	}
	156	if (parent != NULL)
	157	break;
	158	}
	159	if (np == NULL)
	160	return;
	161	isa_bridge_devnode = np;
	162
	163	/* Now parse the "ranges" property and setup the ISA mapping */
	164	pci_process_ISA_OF_ranges(np, hose->io_base_phys);
	165
	166	/* Set the global ISA io base to indicate we have an ISA bridge */
	167	isa_io_base = ISA_IO_BASE;
	168
	169	pr_debug("ISA bridge (early) is %s\n", np->full_name);
	170	}
	171
	172	/**
	173	* isa_bridge_find_late - Find and map the ISA IO space upon discovery of
	174	* a new ISA bridge
	175	*/
	176	static void __devinit isa_bridge_find_late(struct pci_dev *pdev,
	177	struct device_node *devnode)
	178	{
	179	struct pci_controller *hose = pci_bus_to_host(pdev->bus);
	180
	181	/* Store ISA device node and PCI device */
	182	isa_bridge_devnode = of_node_get(devnode);
	183	isa_bridge_pcidev = pdev;
	184
	185	/* Now parse the "ranges" property and setup the ISA mapping */
	186	pci_process_ISA_OF_ranges(devnode, hose->io_base_phys);
	187
	188	/* Set the global ISA io base to indicate we have an ISA bridge */
	189	isa_io_base = ISA_IO_BASE;
	190
	191	pr_debug("ISA bridge (late) is %s on %s\n",
	192	devnode->full_name, pci_name(pdev));
	193	}
	194
	195	/**
	196	* isa_bridge_remove - Remove/unmap an ISA bridge
	197	*/
	198	static void isa_bridge_remove(void)
	199	{
	200	pr_debug("ISA bridge removed !\n");
	201
	202	/* Clear the global ISA io base to indicate that we have no more
	203	* ISA bridge. Note that drivers don't quite handle that, though
	204	* we should probably do something about it. But do we ever really
	205	* have ISA bridges being removed on machines using legacy devices ?
	206	*/
	207	isa_io_base = ISA_IO_BASE;
	208
	209	/* Clear references to the bridge */
	210	of_node_put(isa_bridge_devnode);
	211	isa_bridge_devnode = NULL;
	212	isa_bridge_pcidev = NULL;
213
214	/* Unmap the ISA area */
215	__iounmap_at((void *)ISA_IO_BASE, 0x10000);
216	}
217
218	/**
219	* isa_bridge_notify - Get notified of PCI devices addition/removal
220	*/
221	static int __devinit isa_bridge_notify(struct notifier_block *nb,
222	unsigned long action, void *data)
223	{
224	struct device *dev = data;
225	struct pci_dev *pdev = to_pci_dev(dev);
226	struct device_node *devnode = pci_device_to_OF_node(pdev);
227
228	switch(action) {
229	case BUS_NOTIFY_ADD_DEVICE:
230	/* Check if we have an early ISA device, without PCI dev */
231	if (isa_bridge_devnode && isa_bridge_devnode == devnode &&
232	!isa_bridge_pcidev) {
233	pr_debug("ISA bridge PCI attached: %s\n",
234	pci_name(pdev));
235	isa_bridge_pcidev = pdev;
236	}
237
238	/* Check if we have no ISA device, and this happens to be one,
239	* register it as such if it has an OF device
240	*/
241	if (!isa_bridge_devnode && devnode && devnode->type &&
242	!strcmp(devnode->type, "isa"))
243	isa_bridge_find_late(pdev, devnode);
244
245	return 0;
246	case BUS_NOTIFY_DEL_DEVICE:
247	/* Check if this our existing ISA device */
248	if (pdev == isa_bridge_pcidev \|\|
249	(devnode && devnode == isa_bridge_devnode))
250	isa_bridge_remove();
251	return 0;
252	}
253	return 0;
254	}
255
256	static struct notifier_block isa_bridge_notifier = {
257	.notifier_call = isa_bridge_notify
258	};
259
260	/**
261	* isa_bridge_init - register to be notified of ISA bridge addition/removal
262	*
263	*/
264	static int __init isa_bridge_init(void)
265	{
266	if (firmware_has_feature(FW_FEATURE_ISERIES))
267	return 0;
268	bus_register_notifier(&pci_bus_type, &isa_bridge_notifier);
269	return 0;
270	}
271	arch_initcall(isa_bridge_init);