[linux.git] / arch / ppc / syslib / ppc405_pci.c

/*
 * Authors: Frank Rowand <[email protected]>,
 * Debbie Chu <[email protected]>, or [email protected]
 * Further modifications by Armin Kuster <[email protected]>
 *
 * 2000 (c) MontaVista, Software, Inc.  This file is licensed under
 * the terms of the GNU General Public License version 2.  This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 *
 * Based on arch/ppc/kernel/indirect.c, Copyright (C) 1998 Gabriel Paubert.
 */

#include <linux/pci.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/machdep.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <asm/ocp.h>
#include <asm/ibm4xx.h>
#include <asm/pci-bridge.h>
#include <asm/ibm_ocp_pci.h>


extern void bios_fixup(struct pci_controller *, struct pcil0_regs *);
extern int ppc405_map_irq(struct pci_dev *dev, unsigned char idsel,
			  unsigned char pin);

void
ppc405_pcibios_fixup_resources(struct pci_dev *dev)
{
	int i;
	unsigned long max_host_addr;
	unsigned long min_host_addr;
	struct resource *res;

	/*
	 * openbios puts some graphics cards in the same range as the host
	 * controller uses to map to SDRAM.  Fix it.
	 */

	min_host_addr = 0;
	max_host_addr = PPC405_PCI_MEM_BASE - 1;

	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
		res = dev->resource + i;
		if (!res->start)
			continue;
		if ((res->flags & IORESOURCE_MEM) &&
		    (((res->start >= min_host_addr)
		      && (res->start <= max_host_addr))
		     || ((res->end >= min_host_addr)
			 && (res->end <= max_host_addr))
		     || ((res->start < min_host_addr)
			 && (res->end > max_host_addr))
		    )
		    ) {

			/* force pcibios_assign_resources() to assign a new address */
			res->end -= res->start;
			res->start = 0;
		}
	}
}

static int
ppc4xx_exclude_device(unsigned char bus, unsigned char devfn)
{
	/* We prevent us from seeing ourselves to avoid having
	 * the kernel try to remap our BAR #1 and fuck up bus
	 * master from external PCI devices
	 */
	return (bus == 0 && devfn == 0);
}

void
ppc4xx_find_bridges(void)
{
	struct pci_controller *hose_a;
	struct pcil0_regs *pcip;
	unsigned int tmp_addr;
	unsigned int tmp_size;
	unsigned int reg_index;
	unsigned int new_pmm_max = 0;
	unsigned int new_pmm_min = 0;

	isa_io_base = 0;
	isa_mem_base = 0;
	pci_dram_offset = 0;

	/* Setup PCI32 hose */
	hose_a = pcibios_alloc_controller();
	if (!hose_a)
		return;
	setup_indirect_pci(hose_a, PPC405_PCI_CONFIG_ADDR,
			   PPC405_PCI_CONFIG_DATA);

	pcip = ioremap(PPC4xx_PCI_LCFG_PADDR, PAGE_SIZE);
	if (pcip != NULL) {

#if defined(CONFIG_BIOS_FIXUP)
		bios_fixup(hose_a, pcip);
#endif
		new_pmm_min = 0xffffffff;
		for (reg_index = 0; reg_index < 3; reg_index++) {
			tmp_size = in_le32(&pcip->pmm[reg_index].ma);	// mask & attrs
			/* test the enable bit */
			if ((tmp_size & 0x1) == 0)
				continue;
			tmp_addr = in_le32(&pcip->pmm[reg_index].pcila);	// PCI addr
			if (tmp_addr < PPC405_PCI_PHY_MEM_BASE) {
				printk(KERN_DEBUG
				       "Disabling mapping to PCI mem addr 0x%8.8x\n",
				       tmp_addr);
				out_le32(&pcip->pmm[reg_index].ma, tmp_size & ~1);	// *_PMMOMA
				continue;
			}
			tmp_addr = in_le32(&pcip->pmm[reg_index].la);	// *_PMMOLA
			if (tmp_addr < new_pmm_min)
				new_pmm_min = tmp_addr;
			tmp_addr = tmp_addr +
				(0xffffffff - (tmp_size & 0xffffc000));
			if (tmp_addr > PPC405_PCI_UPPER_MEM) {
				new_pmm_max = tmp_addr;	// PPC405_PCI_UPPER_MEM
			} else {
				new_pmm_max = PPC405_PCI_UPPER_MEM;
			}

		}		// for

		iounmap(pcip);
	}

	hose_a->first_busno = 0;
	hose_a->last_busno = 0xff;
	hose_a->pci_mem_offset = 0;

	/* Setup bridge memory/IO ranges & resources
	 * TODO: Handle firmware setting up a legacy ISA mem base
	 */
	hose_a->io_space.start = PPC405_PCI_LOWER_IO;
	hose_a->io_space.end = PPC405_PCI_UPPER_IO;
	hose_a->mem_space.start = new_pmm_min;
	hose_a->mem_space.end = new_pmm_max;
	hose_a->io_base_phys = PPC405_PCI_PHY_IO_BASE;
	hose_a->io_base_virt = ioremap(hose_a->io_base_phys, 0x10000);
	hose_a->io_resource.start = 0;
	hose_a->io_resource.end = PPC405_PCI_UPPER_IO - PPC405_PCI_LOWER_IO;
	hose_a->io_resource.flags = IORESOURCE_IO;
	hose_a->io_resource.name = "PCI I/O";
	hose_a->mem_resources[0].start = new_pmm_min;
	hose_a->mem_resources[0].end = new_pmm_max;
	hose_a->mem_resources[0].flags = IORESOURCE_MEM;
	hose_a->mem_resources[0].name = "PCI Memory";
	isa_io_base = (int) hose_a->io_base_virt;
	isa_mem_base = 0;	/*     ISA not implemented */
	ISA_DMA_THRESHOLD = 0x00ffffff;	/* ??? ISA not implemented */

	/* Scan busses & initial setup by pci_auto */
	hose_a->last_busno = pciauto_bus_scan(hose_a, hose_a->first_busno);
	hose_a->last_busno = 0;

	/* Setup ppc_md */
	ppc_md.pcibios_fixup = NULL;
	ppc_md.pci_exclude_device = ppc4xx_exclude_device;
	ppc_md.pcibios_fixup_resources = ppc405_pcibios_fixup_resources;
	ppc_md.pci_swizzle = common_swizzle;
	ppc_md.pci_map_irq = ppc405_map_irq;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Authors: Frank Rowand <[email protected]>,
	3	* Debbie Chu <[email protected]>, or [email protected]
	4	* Further modifications by Armin Kuster <[email protected]>
	5	*
	6	* 2000 (c) MontaVista, Software, Inc. This file is licensed under
	7	* the terms of the GNU General Public License version 2. This program
	8	* is licensed "as is" without any warranty of any kind, whether express
	9	* or implied.
	10	*
	11	* Based on arch/ppc/kernel/indirect.c, Copyright (C) 1998 Gabriel Paubert.
	12	*/
	13
	14	#include <linux/pci.h>
	15	#include <asm/io.h>
	16	#include <asm/system.h>
	17	#include <asm/machdep.h>
	18	#include <linux/init.h>
	19	#include <linux/errno.h>
	20	#include <asm/ocp.h>
	21	#include <asm/ibm4xx.h>
	22	#include <asm/pci-bridge.h>
	23	#include <asm/ibm_ocp_pci.h>
	24
	25
	26	extern void bios_fixup(struct pci_controller , struct pcil0_regs );
	27	extern int ppc405_map_irq(struct pci_dev *dev, unsigned char idsel,
	28	unsigned char pin);
	29
	30	void
	31	ppc405_pcibios_fixup_resources(struct pci_dev *dev)
	32	{
	33	int i;
	34	unsigned long max_host_addr;
	35	unsigned long min_host_addr;
	36	struct resource *res;
	37
	38	/*
	39	* openbios puts some graphics cards in the same range as the host
	40	* controller uses to map to SDRAM. Fix it.
	41	*/
	42
	43	min_host_addr = 0;
	44	max_host_addr = PPC405_PCI_MEM_BASE - 1;
	45
	46	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
	47	res = dev->resource + i;
	48	if (!res->start)
	49	continue;
	50	if ((res->flags & IORESOURCE_MEM) &&
	51	(((res->start >= min_host_addr)
	52	&& (res->start <= max_host_addr))
	53	\|\| ((res->end >= min_host_addr)
	54	&& (res->end <= max_host_addr))
	55	\|\| ((res->start < min_host_addr)
	56	&& (res->end > max_host_addr))
	57	)
	58	) {
	59
	60	/* force pcibios_assign_resources() to assign a new address */
	61	res->end -= res->start;
	62	res->start = 0;
	63	}
	64	}
65	}
66
67	static int
68	ppc4xx_exclude_device(unsigned char bus, unsigned char devfn)
69	{
70	/* We prevent us from seeing ourselves to avoid having
71	* the kernel try to remap our BAR #1 and fuck up bus
72	* master from external PCI devices
73	*/
74	return (bus == 0 && devfn == 0);
75	}
76
77	void
78	ppc4xx_find_bridges(void)
79	{
80	struct pci_controller *hose_a;
81	struct pcil0_regs *pcip;
82	unsigned int tmp_addr;
83	unsigned int tmp_size;
84	unsigned int reg_index;
85	unsigned int new_pmm_max = 0;
86	unsigned int new_pmm_min = 0;
87
88	isa_io_base = 0;
89	isa_mem_base = 0;
90	pci_dram_offset = 0;
91
1da177e4 LT	92	/* Setup PCI32 hose */
	93	hose_a = pcibios_alloc_controller();
	94	if (!hose_a)
	95	return;
	96	setup_indirect_pci(hose_a, PPC405_PCI_CONFIG_ADDR,
	97	PPC405_PCI_CONFIG_DATA);
	98
	99	pcip = ioremap(PPC4xx_PCI_LCFG_PADDR, PAGE_SIZE);
	100	if (pcip != NULL) {
	101
	102	#if defined(CONFIG_BIOS_FIXUP)
	103	bios_fixup(hose_a, pcip);
	104	#endif
	105	new_pmm_min = 0xffffffff;
	106	for (reg_index = 0; reg_index < 3; reg_index++) {
	107	tmp_size = in_le32(&pcip->pmm[reg_index].ma); // mask & attrs
	108	/* test the enable bit */
	109	if ((tmp_size & 0x1) == 0)
	110	continue;
	111	tmp_addr = in_le32(&pcip->pmm[reg_index].pcila); // PCI addr
	112	if (tmp_addr < PPC405_PCI_PHY_MEM_BASE) {
	113	printk(KERN_DEBUG
	114	"Disabling mapping to PCI mem addr 0x%8.8x\n",
	115	tmp_addr);
	116	out_le32(&pcip->pmm[reg_index].ma, tmp_size & ~1); // *_PMMOMA
	117	continue;
	118	}
	119	tmp_addr = in_le32(&pcip->pmm[reg_index].la); // *_PMMOLA
	120	if (tmp_addr < new_pmm_min)
	121	new_pmm_min = tmp_addr;
	122	tmp_addr = tmp_addr +
	123	(0xffffffff - (tmp_size & 0xffffc000));
	124	if (tmp_addr > PPC405_PCI_UPPER_MEM) {
	125	new_pmm_max = tmp_addr; // PPC405_PCI_UPPER_MEM
	126	} else {
	127	new_pmm_max = PPC405_PCI_UPPER_MEM;
	128	}
	129
	130	} // for
	131
	132	iounmap(pcip);
	133	}
	134
	135	hose_a->first_busno = 0;
	136	hose_a->last_busno = 0xff;
	137	hose_a->pci_mem_offset = 0;
	138
	139	/* Setup bridge memory/IO ranges & resources
a8de5ce9	140	* TODO: Handle firmware setting up a legacy ISA mem base
1da177e4 LT	141	*/
	142	hose_a->io_space.start = PPC405_PCI_LOWER_IO;
	143	hose_a->io_space.end = PPC405_PCI_UPPER_IO;
	144	hose_a->mem_space.start = new_pmm_min;
	145	hose_a->mem_space.end = new_pmm_max;
	146	hose_a->io_base_phys = PPC405_PCI_PHY_IO_BASE;
	147	hose_a->io_base_virt = ioremap(hose_a->io_base_phys, 0x10000);
	148	hose_a->io_resource.start = 0;
	149	hose_a->io_resource.end = PPC405_PCI_UPPER_IO - PPC405_PCI_LOWER_IO;
	150	hose_a->io_resource.flags = IORESOURCE_IO;
	151	hose_a->io_resource.name = "PCI I/O";
	152	hose_a->mem_resources[0].start = new_pmm_min;
	153	hose_a->mem_resources[0].end = new_pmm_max;
	154	hose_a->mem_resources[0].flags = IORESOURCE_MEM;
	155	hose_a->mem_resources[0].name = "PCI Memory";
	156	isa_io_base = (int) hose_a->io_base_virt;
	157	isa_mem_base = 0; /* ISA not implemented */
	158	ISA_DMA_THRESHOLD = 0x00ffffff; /* ??? ISA not implemented */
	159
	160	/* Scan busses & initial setup by pci_auto */
	161	hose_a->last_busno = pciauto_bus_scan(hose_a, hose_a->first_busno);
	162	hose_a->last_busno = 0;
	163
	164	/* Setup ppc_md */
	165	ppc_md.pcibios_fixup = NULL;
	166	ppc_md.pci_exclude_device = ppc4xx_exclude_device;
	167	ppc_md.pcibios_fixup_resources = ppc405_pcibios_fixup_resources;
	168	ppc_md.pci_swizzle = common_swizzle;
	169	ppc_md.pci_map_irq = ppc405_map_irq;
	170	}