arch/ppc/platforms/chrp_pci.c - arm/linux - Git at Google

 /*
  * CHRP pci routines.
  */

 #include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/delay.h>
 #include <linux/string.h>
 #include <linux/init.h>
 #include <linux/ide.h>
 #include <linux/bootmem.h>

 #include <asm/io.h>
 #include <asm/pgtable.h>
 #include <asm/irq.h>
 #include <asm/hydra.h>
 #include <asm/prom.h>
 #include <asm/gg2.h>
 #include <asm/machdep.h>
 #include <asm/sections.h>
 #include <asm/pci-bridge.h>
 #include <asm/open_pic.h>

 /* LongTrail */
 void __iomem *gg2_pci_config_base;

 /*
  * The VLSI Golden Gate II has only 512K of PCI configuration space, so we
  * limit the bus number to 3 bits
  */

 int __chrp gg2_read_config(struct pci_bus *bus, unsigned int devfn, int off,
 			   int len, u32 *val)
 {
 	volatile void __iomem *cfg_data;
 	struct pci_controller *hose = bus->sysdata;

 	if (bus->number > 7)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	/*
 	 * Note: the caller has already checked that off is
 	 * suitably aligned and that len is 1, 2 or 4.
 	 */
 	cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
 	switch (len) {
 	case 1:
 		*val =  in_8(cfg_data);
 		break;
 	case 2:
 		*val = in_le16(cfg_data);
 		break;
 	default:
 		*val = in_le32(cfg_data);
 		break;
 	}
 	return PCIBIOS_SUCCESSFUL;
 }

 int __chrp gg2_write_config(struct pci_bus *bus, unsigned int devfn, int off,
 			    int len, u32 val)
 {
 	volatile void __iomem *cfg_data;
 	struct pci_controller *hose = bus->sysdata;

 	if (bus->number > 7)
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	/*
 	 * Note: the caller has already checked that off is
 	 * suitably aligned and that len is 1, 2 or 4.
 	 */
 	cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
 	switch (len) {
 	case 1:
 		out_8(cfg_data, val);
 		break;
 	case 2:
 		out_le16(cfg_data, val);
 		break;
 	default:
 		out_le32(cfg_data, val);
 		break;
 	}
 	return PCIBIOS_SUCCESSFUL;
 }

 static struct pci_ops gg2_pci_ops =
 {
 	gg2_read_config,
 	gg2_write_config
 };

 /*
  * Access functions for PCI config space using RTAS calls.
  */
 int __chrp
 rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
 		 int len, u32 *val)
 {
 	struct pci_controller *hose = bus->sysdata;
 	unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
 		| (((bus->number - hose->first_busno) & 0xff) << 16)
 		| (hose->index << 24);
         unsigned long ret = ~0UL;
 	int rval;

 	rval = call_rtas("read-pci-config", 2, 2, &ret, addr, len);
 	*val = ret;
 	return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
 }

 int __chrp
 rtas_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
 		  int len, u32 val)
 {
 	struct pci_controller *hose = bus->sysdata;
 	unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
 		| (((bus->number - hose->first_busno) & 0xff) << 16)
 		| (hose->index << 24);
 	int rval;

 	rval = call_rtas("write-pci-config", 3, 1, NULL, addr, len, val);
 	return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
 }

 static struct pci_ops rtas_pci_ops =
 {
 	rtas_read_config,
 	rtas_write_config
 };

 volatile struct Hydra __iomem *Hydra = NULL;

 int __init
 hydra_init(void)
 {
 	struct device_node *np;

 	np = find_devices("mac-io");
 	if (np == NULL || np->n_addrs == 0)
 		return 0;
 	Hydra = ioremap(np->addrs[0].address, np->addrs[0].size);
 	printk("Hydra Mac I/O at %x\n", np->addrs[0].address);
 	printk("Hydra Feature_Control was %x",
 	       in_le32(&Hydra->Feature_Control));
 	out_le32(&Hydra->Feature_Control, (HYDRA_FC_SCC_CELL_EN |
 					   HYDRA_FC_SCSI_CELL_EN |
 					   HYDRA_FC_SCCA_ENABLE |
 					   HYDRA_FC_SCCB_ENABLE |
 					   HYDRA_FC_ARB_BYPASS |
 					   HYDRA_FC_MPIC_ENABLE |
 					   HYDRA_FC_SLOW_SCC_PCLK |
 					   HYDRA_FC_MPIC_IS_MASTER));
 	printk(", now %x\n", in_le32(&Hydra->Feature_Control));
 	return 1;
 }

 void __init
 chrp_pcibios_fixup(void)
 {
 	struct pci_dev *dev = NULL;
 	struct device_node *np;

 	/* PCI interrupts are controlled by the OpenPIC */
 	for_each_pci_dev(dev) {
 		np = pci_device_to_OF_node(dev);
 		if ((np != 0) && (np->n_intrs > 0) && (np->intrs[0].line != 0))
 			dev->irq = np->intrs[0].line;
 		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
 	}
 }

 #define PRG_CL_RESET_VALID 0x00010000

 static void __init
 setup_python(struct pci_controller *hose, struct device_node *dev)
 {
 	u32 __iomem *reg;
 	u32 val;
 	unsigned long addr = dev->addrs[0].address;

 	setup_indirect_pci(hose, addr + 0xf8000, addr + 0xf8010);

 	/* Clear the magic go-slow bit */
 	reg = ioremap(dev->addrs[0].address + 0xf6000, 0x40);
 	val = in_be32(&reg[12]);
 	if (val & PRG_CL_RESET_VALID) {
 		out_be32(&reg[12], val & ~PRG_CL_RESET_VALID);
 		in_be32(&reg[12]);
 	}
 	iounmap(reg);
 }

 /* Marvell Discovery II based Pegasos 2 */
 static void __init setup_peg2(struct pci_controller *hose, struct device_node *dev)
 {
 	struct device_node *root = find_path_device("/");
 	struct device_node *rtas;

 	rtas = of_find_node_by_name (root, "rtas");
 	if (rtas) {
 		hose->ops = &rtas_pci_ops;
 	} else {
 		printk ("RTAS supporting Pegasos OF not found, please upgrade"
 			" your firmware\n");
 	}
 	pci_assign_all_busses = 1;
 }

 void __init
 chrp_find_bridges(void)
 {
 	struct device_node *dev;
 	int *bus_range;
 	int len, index = -1;
 	struct pci_controller *hose;
 	unsigned int *dma;
 	char *model, *machine;
 	int is_longtrail = 0, is_mot = 0, is_pegasos = 0;
 	struct device_node *root = find_path_device("/");

 	/*
 	 * The PCI host bridge nodes on some machines don't have
 	 * properties to adequately identify them, so we have to
 	 * look at what sort of machine this is as well.
 	 */
 	machine = get_property(root, "model", NULL);
 	if (machine != NULL) {
 		is_longtrail = strncmp(machine, "IBM,LongTrail", 13) == 0;
 		is_mot = strncmp(machine, "MOT", 3) == 0;
 		if (strncmp(machine, "Pegasos2", 8) == 0)
 			is_pegasos = 2;
 		else if (strncmp(machine, "Pegasos", 7) == 0)
 			is_pegasos = 1;
 	}
 	for (dev = root->child; dev != NULL; dev = dev->sibling) {
 		if (dev->type == NULL || strcmp(dev->type, "pci") != 0)
 			continue;
 		++index;
 		/* The GG2 bridge on the LongTrail doesn't have an address */
 		if (dev->n_addrs < 1 && !is_longtrail) {
 			printk(KERN_WARNING "Can't use %s: no address\n",
 			       dev->full_name);
 			continue;
 		}
 		bus_range = (int *) get_property(dev, "bus-range", &len);
 		if (bus_range == NULL || len < 2 * sizeof(int)) {
 			printk(KERN_WARNING "Can't get bus-range for %s\n",
 				dev->full_name);
 			continue;
 		}
 		if (bus_range[1] == bus_range[0])
 			printk(KERN_INFO "PCI bus %d", bus_range[0]);
 		else
 			printk(KERN_INFO "PCI buses %d..%d",
 			       bus_range[0], bus_range[1]);
 		printk(" controlled by %s", dev->type);
 		if (dev->n_addrs > 0)
 			printk(" at %x", dev->addrs[0].address);
 		printk("\n");

 		hose = pcibios_alloc_controller();
 		if (!hose) {
 			printk("Can't allocate PCI controller structure for %s\n",
 				dev->full_name);
 			continue;
 		}
 		hose->arch_data = dev;
 		hose->first_busno = bus_range[0];
 		hose->last_busno = bus_range[1];

 		model = get_property(dev, "model", NULL);
 		if (model == NULL)
 			model = "<none>";
 		if (device_is_compatible(dev, "IBM,python")) {
 			setup_python(hose, dev);
 		} else if (is_mot
 			   || strncmp(model, "Motorola, Grackle", 17) == 0) {
 			setup_grackle(hose);
 		} else if (is_longtrail) {
 			void __iomem *p = ioremap(GG2_PCI_CONFIG_BASE, 0x80000);
 			hose->ops = &gg2_pci_ops;
 			hose->cfg_data = p;
 			gg2_pci_config_base = p;
 		} else if (is_pegasos == 1) {
 			setup_indirect_pci(hose, 0xfec00cf8, 0xfee00cfc);
 		} else if (is_pegasos == 2) {
 			setup_peg2(hose, dev);
 		} else {
 			printk("No methods for %s (model %s), using RTAS\n",
 			       dev->full_name, model);
 			hose->ops = &rtas_pci_ops;
 		}

 		pci_process_bridge_OF_ranges(hose, dev, index == 0);

 		/* check the first bridge for a property that we can
 		   use to set pci_dram_offset */
 		dma = (unsigned int *)
 			get_property(dev, "ibm,dma-ranges", &len);
 		if (index == 0 && dma != NULL && len >= 6 * sizeof(*dma)) {
 			pci_dram_offset = dma[2] - dma[3];
 			printk("pci_dram_offset = %lx\n", pci_dram_offset);
 		}
 	}

 	/* Do not fixup interrupts from OF tree on pegasos */
 	if (is_pegasos == 0)
 		ppc_md.pcibios_fixup = chrp_pcibios_fixup;
 }
	/*
	* CHRP pci routines.
	*/

	#include <linux/config.h>
	#include <linux/kernel.h>
	#include <linux/pci.h>
	#include <linux/delay.h>
	#include <linux/string.h>
	#include <linux/init.h>
	#include <linux/ide.h>
	#include <linux/bootmem.h>

	#include <asm/io.h>
	#include <asm/pgtable.h>
	#include <asm/irq.h>
	#include <asm/hydra.h>
	#include <asm/prom.h>
	#include <asm/gg2.h>
	#include <asm/machdep.h>
	#include <asm/sections.h>
	#include <asm/pci-bridge.h>
	#include <asm/open_pic.h>

	/* LongTrail */
	void __iomem *gg2_pci_config_base;

	/*
	* The VLSI Golden Gate II has only 512K of PCI configuration space, so we
	* limit the bus number to 3 bits
	*/

	int __chrp gg2_read_config(struct pci_bus *bus, unsigned int devfn, int off,
	int len, u32 *val)
	{
	volatile void __iomem *cfg_data;
	struct pci_controller *hose = bus->sysdata;

	if (bus->number > 7)
	return PCIBIOS_DEVICE_NOT_FOUND;
	/*
	* Note: the caller has already checked that off is
	* suitably aligned and that len is 1, 2 or 4.
	*/
	cfg_data = hose->cfg_data + ((bus->number<<16) \| (devfn<<8) \| off);
	switch (len) {
	case 1:
	*val = in_8(cfg_data);
	break;
	case 2:
	*val = in_le16(cfg_data);
	break;
	default:
	*val = in_le32(cfg_data);
	break;
	}
	return PCIBIOS_SUCCESSFUL;
	}

	int __chrp gg2_write_config(struct pci_bus *bus, unsigned int devfn, int off,
	int len, u32 val)
	{
	volatile void __iomem *cfg_data;
	struct pci_controller *hose = bus->sysdata;

	if (bus->number > 7)
	return PCIBIOS_DEVICE_NOT_FOUND;
	/*
	* Note: the caller has already checked that off is
	* suitably aligned and that len is 1, 2 or 4.
	*/
	cfg_data = hose->cfg_data + ((bus->number<<16) \| (devfn<<8) \| off);
	switch (len) {
	case 1:
	out_8(cfg_data, val);
	break;
	case 2:
	out_le16(cfg_data, val);
	break;
	default:
	out_le32(cfg_data, val);
	break;
	}
	return PCIBIOS_SUCCESSFUL;
	}

	static struct pci_ops gg2_pci_ops =
	{
	gg2_read_config,
	gg2_write_config
	};

	/*
	* Access functions for PCI config space using RTAS calls.
	*/
	int __chrp
	rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
	int len, u32 *val)
	{
	struct pci_controller *hose = bus->sysdata;
	unsigned long addr = (offset & 0xff) \| ((devfn & 0xff) << 8)
	\| (((bus->number - hose->first_busno) & 0xff) << 16)
	\| (hose->index << 24);
	unsigned long ret = ~0UL;
	int rval;

	rval = call_rtas("read-pci-config", 2, 2, &ret, addr, len);
	*val = ret;
	return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
	}

	int __chrp
	rtas_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
	int len, u32 val)
	{
	struct pci_controller *hose = bus->sysdata;
	unsigned long addr = (offset & 0xff) \| ((devfn & 0xff) << 8)
	\| (((bus->number - hose->first_busno) & 0xff) << 16)
	\| (hose->index << 24);
	int rval;

	rval = call_rtas("write-pci-config", 3, 1, NULL, addr, len, val);
	return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
	}

	static struct pci_ops rtas_pci_ops =
	{
	rtas_read_config,
	rtas_write_config
	};

	volatile struct Hydra __iomem *Hydra = NULL;

	int __init
	hydra_init(void)
	{
	struct device_node *np;

	np = find_devices("mac-io");
	if (np == NULL \|\| np->n_addrs == 0)
	return 0;
	Hydra = ioremap(np->addrs[0].address, np->addrs[0].size);
	printk("Hydra Mac I/O at %x\n", np->addrs[0].address);
	printk("Hydra Feature_Control was %x",
	in_le32(&Hydra->Feature_Control));
	out_le32(&Hydra->Feature_Control, (HYDRA_FC_SCC_CELL_EN \|
	HYDRA_FC_SCSI_CELL_EN \|
	HYDRA_FC_SCCA_ENABLE \|
	HYDRA_FC_SCCB_ENABLE \|
	HYDRA_FC_ARB_BYPASS \|
	HYDRA_FC_MPIC_ENABLE \|
	HYDRA_FC_SLOW_SCC_PCLK \|
	HYDRA_FC_MPIC_IS_MASTER));
	printk(", now %x\n", in_le32(&Hydra->Feature_Control));
	return 1;
	}

	void __init
	chrp_pcibios_fixup(void)
	{
	struct pci_dev *dev = NULL;
	struct device_node *np;

	/* PCI interrupts are controlled by the OpenPIC */
	for_each_pci_dev(dev) {
	np = pci_device_to_OF_node(dev);
	if ((np != 0) && (np->n_intrs > 0) && (np->intrs[0].line != 0))
	dev->irq = np->intrs[0].line;
	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
	}
	}

	#define PRG_CL_RESET_VALID 0x00010000

	static void __init
	setup_python(struct pci_controller hose, struct device_node dev)
	{
	u32 __iomem *reg;
	u32 val;
	unsigned long addr = dev->addrs[0].address;

	setup_indirect_pci(hose, addr + 0xf8000, addr + 0xf8010);

	/* Clear the magic go-slow bit */
	reg = ioremap(dev->addrs[0].address + 0xf6000, 0x40);
	val = in_be32(&reg[12]);
	if (val & PRG_CL_RESET_VALID) {
	out_be32(&reg[12], val & ~PRG_CL_RESET_VALID);
	in_be32(&reg[12]);
	}
	iounmap(reg);
	}

	/* Marvell Discovery II based Pegasos 2 */
	static void __init setup_peg2(struct pci_controller hose, struct device_node dev)
	{
	struct device_node *root = find_path_device("/");
	struct device_node *rtas;

	rtas = of_find_node_by_name (root, "rtas");
	if (rtas) {
	hose->ops = &rtas_pci_ops;
	} else {
	printk ("RTAS supporting Pegasos OF not found, please upgrade"
	" your firmware\n");
	}
	pci_assign_all_busses = 1;
	}

	void __init
	chrp_find_bridges(void)
	{
	struct device_node *dev;
	int *bus_range;
	int len, index = -1;
	struct pci_controller *hose;
	unsigned int *dma;
	char model, machine;
	int is_longtrail = 0, is_mot = 0, is_pegasos = 0;
	struct device_node *root = find_path_device("/");

	/*
	* The PCI host bridge nodes on some machines don't have
	* properties to adequately identify them, so we have to
	* look at what sort of machine this is as well.
	*/
	machine = get_property(root, "model", NULL);
	if (machine != NULL) {
	is_longtrail = strncmp(machine, "IBM,LongTrail", 13) == 0;
	is_mot = strncmp(machine, "MOT", 3) == 0;
	if (strncmp(machine, "Pegasos2", 8) == 0)
	is_pegasos = 2;
	else if (strncmp(machine, "Pegasos", 7) == 0)
	is_pegasos = 1;
	}
	for (dev = root->child; dev != NULL; dev = dev->sibling) {
	if (dev->type == NULL \|\| strcmp(dev->type, "pci") != 0)
	continue;
	++index;
	/* The GG2 bridge on the LongTrail doesn't have an address */
	if (dev->n_addrs < 1 && !is_longtrail) {
	printk(KERN_WARNING "Can't use %s: no address\n",
	dev->full_name);
	continue;
	}
	bus_range = (int *) get_property(dev, "bus-range", &len);
	if (bus_range == NULL \|\| len < 2 * sizeof(int)) {
	printk(KERN_WARNING "Can't get bus-range for %s\n",
	dev->full_name);
	continue;
	}
	if (bus_range[1] == bus_range[0])
	printk(KERN_INFO "PCI bus %d", bus_range[0]);
	else
	printk(KERN_INFO "PCI buses %d..%d",
	bus_range[0], bus_range[1]);
	printk(" controlled by %s", dev->type);
	if (dev->n_addrs > 0)
	printk(" at %x", dev->addrs[0].address);
	printk("\n");

	hose = pcibios_alloc_controller();
	if (!hose) {
	printk("Can't allocate PCI controller structure for %s\n",
	dev->full_name);
	continue;
	}
	hose->arch_data = dev;
	hose->first_busno = bus_range[0];
	hose->last_busno = bus_range[1];

	model = get_property(dev, "model", NULL);
	if (model == NULL)
	model = "<none>";
	if (device_is_compatible(dev, "IBM,python")) {
	setup_python(hose, dev);
	} else if (is_mot
	\|\| strncmp(model, "Motorola, Grackle", 17) == 0) {
	setup_grackle(hose);
	} else if (is_longtrail) {
	void __iomem *p = ioremap(GG2_PCI_CONFIG_BASE, 0x80000);
	hose->ops = &gg2_pci_ops;
	hose->cfg_data = p;
	gg2_pci_config_base = p;
	} else if (is_pegasos == 1) {
	setup_indirect_pci(hose, 0xfec00cf8, 0xfee00cfc);
	} else if (is_pegasos == 2) {
	setup_peg2(hose, dev);
	} else {
	printk("No methods for %s (model %s), using RTAS\n",
	dev->full_name, model);
	hose->ops = &rtas_pci_ops;
	}

	pci_process_bridge_OF_ranges(hose, dev, index == 0);

	/* check the first bridge for a property that we can
	use to set pci_dram_offset */
	dma = (unsigned int *)
	get_property(dev, "ibm,dma-ranges", &len);
	if (index == 0 && dma != NULL && len >= 6 * sizeof(*dma)) {
	pci_dram_offset = dma[2] - dma[3];
	printk("pci_dram_offset = %lx\n", pci_dram_offset);
	}
	}

	/* Do not fixup interrupts from OF tree on pegasos */
	if (is_pegasos == 0)
	ppc_md.pcibios_fixup = chrp_pcibios_fixup;
	}