arch/powerpc/platforms/85xx/mpc85xx_cds.c - maze/linux - Git at Google

 /*
  * MPC85xx setup and early boot code plus other random bits.
  *
  * Maintained by Kumar Gala (see MAINTAINERS for contact information)
  *
  * Copyright 2005 Freescale Semiconductor Inc.
  *
  * 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.
  */

 #include <linux/stddef.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/errno.h>
 #include <linux/reboot.h>
 #include <linux/pci.h>
 #include <linux/kdev_t.h>
 #include <linux/major.h>
 #include <linux/console.h>
 #include <linux/delay.h>
 #include <linux/seq_file.h>
 #include <linux/initrd.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/fsl_devices.h>

 #include <asm/system.h>
 #include <asm/pgtable.h>
 #include <asm/page.h>
 #include <asm/atomic.h>
 #include <asm/time.h>
 #include <asm/io.h>
 #include <asm/machdep.h>
 #include <asm/ipic.h>
 #include <asm/pci-bridge.h>
 #include <asm/irq.h>
 #include <mm/mmu_decl.h>
 #include <asm/prom.h>
 #include <asm/udbg.h>
 #include <asm/mpic.h>
 #include <asm/i8259.h>

 #include <sysdev/fsl_soc.h>
 #include <sysdev/fsl_pci.h>

 /* CADMUS info */
 /* xxx - galak, move into device tree */
 #define CADMUS_BASE (0xf8004000)
 #define CADMUS_SIZE (256)
 #define CM_VER	(0)
 #define CM_CSR	(1)
 #define CM_RST	(2)


 static int cds_pci_slot = 2;
 static volatile u8 *cadmus;

 #ifdef CONFIG_PCI

 #define ARCADIA_HOST_BRIDGE_IDSEL	17
 #define ARCADIA_2ND_BRIDGE_IDSEL	3

 static int mpc85xx_exclude_device(struct pci_controller *hose,
 				  u_char bus, u_char devfn)
 {
 	/* We explicitly do not go past the Tundra 320 Bridge */
 	if ((bus == 1) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	if ((bus == 0) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	else
 		return PCIBIOS_SUCCESSFUL;
 }

 static void mpc85xx_cds_restart(char *cmd)
 {
 	struct pci_dev *dev;
 	u_char tmp;

 	if ((dev = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686,
 					NULL))) {

 		/* Use the VIA Super Southbridge to force a PCI reset */
 		pci_read_config_byte(dev, 0x47, &tmp);
 		pci_write_config_byte(dev, 0x47, tmp | 1);

 		/* Flush the outbound PCI write queues */
 		pci_read_config_byte(dev, 0x47, &tmp);

 		/*
 		 *  At this point, the harware reset should have triggered.
 		 *  However, if it doesn't work for some mysterious reason,
 		 *  just fall through to the default reset below.
 		 */

 		pci_dev_put(dev);
 	}

 	/*
 	 *  If we can't find the VIA chip (maybe the P2P bridge is disabled)
 	 *  or the VIA chip reset didn't work, just use the default reset.
 	 */
 	fsl_rstcr_restart(NULL);
 }

 static void __init mpc85xx_cds_pci_irq_fixup(struct pci_dev *dev)
 {
 	u_char c;
 	if (dev->vendor == PCI_VENDOR_ID_VIA) {
 		switch (dev->device) {
 		case PCI_DEVICE_ID_VIA_82C586_1:
 			/*
 			 * U-Boot does not set the enable bits
 			 * for the IDE device. Force them on here.
 			 */
 			pci_read_config_byte(dev, 0x40, &c);
 			c |= 0x03; /* IDE: Chip Enable Bits */
 			pci_write_config_byte(dev, 0x40, c);

 			/*
 			 * Since only primary interface works, force the
 			 * IDE function to standard primary IDE interrupt
 			 * w/ 8259 offset
 			 */
 			dev->irq = 14;
 			pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
 			break;
 		/*
 		 * Force legacy USB interrupt routing
 		 */
 		case PCI_DEVICE_ID_VIA_82C586_2:
 		/* There are two USB controllers.
 		 * Identify them by functon number
 		 */
 			if (PCI_FUNC(dev->devfn) == 3)
 				dev->irq = 11;
 			else
 				dev->irq = 10;
 			pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
 		default:
 			break;
 		}
 	}
 }

 static void __devinit skip_fake_bridge(struct pci_dev *dev)
 {
 	/* Make it an error to skip the fake bridge
 	 * in pci_setup_device() in probe.c */
 	dev->hdr_type = 0x7f;
 }
 DECLARE_PCI_FIXUP_EARLY(0x1957, 0x3fff, skip_fake_bridge);
 DECLARE_PCI_FIXUP_EARLY(0x3fff, 0x1957, skip_fake_bridge);
 DECLARE_PCI_FIXUP_EARLY(0xff3f, 0x5719, skip_fake_bridge);

 #ifdef CONFIG_PPC_I8259
 static void mpc85xx_8259_cascade_handler(unsigned int irq,
 					 struct irq_desc *desc)
 {
 	unsigned int cascade_irq = i8259_irq();

 	if (cascade_irq != NO_IRQ)
 		/* handle an interrupt from the 8259 */
 		generic_handle_irq(cascade_irq);

 	/* check for any interrupts from the shared IRQ line */
 	handle_fasteoi_irq(irq, desc);
 }

 static irqreturn_t mpc85xx_8259_cascade_action(int irq, void *dev_id)
 {
 	return IRQ_HANDLED;
 }

 static struct irqaction mpc85xxcds_8259_irqaction = {
 	.handler = mpc85xx_8259_cascade_action,
 	.flags = IRQF_SHARED,
 	.mask = CPU_MASK_NONE,
 	.name = "8259 cascade",
 };
 #endif /* PPC_I8259 */
 #endif /* CONFIG_PCI */

 static void __init mpc85xx_cds_pic_init(void)
 {
 	struct mpic *mpic;
 	struct resource r;
 	struct device_node *np = NULL;

 	np = of_find_node_by_type(np, "open-pic");

 	if (np == NULL) {
 		printk(KERN_ERR "Could not find open-pic node\n");
 		return;
 	}

 	if (of_address_to_resource(np, 0, &r)) {
 		printk(KERN_ERR "Failed to map mpic register space\n");
 		of_node_put(np);
 		return;
 	}

 	mpic = mpic_alloc(np, r.start,
 			MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
 			0, 256, " OpenPIC  ");
 	BUG_ON(mpic == NULL);

 	/* Return the mpic node */
 	of_node_put(np);

 	mpic_init(mpic);
 }

 #if defined(CONFIG_PPC_I8259) && defined(CONFIG_PCI)
 static int mpc85xx_cds_8259_attach(void)
 {
 	int ret;
 	struct device_node *np = NULL;
 	struct device_node *cascade_node = NULL;
 	int cascade_irq;

 	/* Initialize the i8259 controller */
 	for_each_node_by_type(np, "interrupt-controller")
 		if (of_device_is_compatible(np, "chrp,iic")) {
 			cascade_node = np;
 			break;
 		}

 	if (cascade_node == NULL) {
 		printk(KERN_DEBUG "Could not find i8259 PIC\n");
 		return -ENODEV;
 	}

 	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
 	if (cascade_irq == NO_IRQ) {
 		printk(KERN_ERR "Failed to map cascade interrupt\n");
 		return -ENXIO;
 	}

 	i8259_init(cascade_node, 0);
 	of_node_put(cascade_node);

 	/*
 	 *  Hook the interrupt to make sure desc->action is never NULL.
 	 *  This is required to ensure that the interrupt does not get
 	 *  disabled when the last user of the shared IRQ line frees their
 	 *  interrupt.
 	 */
 	if ((ret = setup_irq(cascade_irq, &mpc85xxcds_8259_irqaction))) {
 		printk(KERN_ERR "Failed to setup cascade interrupt\n");
 		return ret;
 	}

 	/* Success. Connect our low-level cascade handler. */
 	set_irq_handler(cascade_irq, mpc85xx_8259_cascade_handler);

 	return 0;
 }
 machine_device_initcall(mpc85xx_cds, mpc85xx_cds_8259_attach);

 #endif /* CONFIG_PPC_I8259 */

 /*
  * Setup the architecture
  */
 static void __init mpc85xx_cds_setup_arch(void)
 {
 #ifdef CONFIG_PCI
 	struct device_node *np;
 #endif

 	if (ppc_md.progress)
 		ppc_md.progress("mpc85xx_cds_setup_arch()", 0);

 	cadmus = ioremap(CADMUS_BASE, CADMUS_SIZE);
 	cds_pci_slot = ((cadmus[CM_CSR] >> 6) & 0x3) + 1;

 	if (ppc_md.progress) {
 		char buf[40];
 		snprintf(buf, 40, "CDS Version = 0x%x in slot %d\n",
 				cadmus[CM_VER], cds_pci_slot);
 		ppc_md.progress(buf, 0);
 	}

 #ifdef CONFIG_PCI
 	for_each_node_by_type(np, "pci") {
 		if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
 		    of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
 			struct resource rsrc;
 			of_address_to_resource(np, 0, &rsrc);
 			if ((rsrc.start & 0xfffff) == 0x8000)
 				fsl_add_bridge(np, 1);
 			else
 				fsl_add_bridge(np, 0);
 		}
 	}

 	ppc_md.pci_irq_fixup = mpc85xx_cds_pci_irq_fixup;
 	ppc_md.pci_exclude_device = mpc85xx_exclude_device;
 #endif
 }

 static void mpc85xx_cds_show_cpuinfo(struct seq_file *m)
 {
 	uint pvid, svid, phid1;
 	uint memsize = total_memory;

 	pvid = mfspr(SPRN_PVR);
 	svid = mfspr(SPRN_SVR);

 	seq_printf(m, "Vendor\t\t: Freescale Semiconductor\n");
 	seq_printf(m, "Machine\t\t: MPC85xx CDS (0x%x)\n", cadmus[CM_VER]);
 	seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
 	seq_printf(m, "SVR\t\t: 0x%x\n", svid);

 	/* Display cpu Pll setting */
 	phid1 = mfspr(SPRN_HID1);
 	seq_printf(m, "PLL setting\t: 0x%x\n", ((phid1 >> 24) & 0x3f));

 	/* Display the amount of memory */
 	seq_printf(m, "Memory\t\t: %d MB\n", memsize / (1024 * 1024));
 }


 /*
  * Called very early, device-tree isn't unflattened
  */
 static int __init mpc85xx_cds_probe(void)
 {
         unsigned long root = of_get_flat_dt_root();

         return of_flat_dt_is_compatible(root, "MPC85xxCDS");
 }

 define_machine(mpc85xx_cds) {
 	.name		= "MPC85xx CDS",
 	.probe		= mpc85xx_cds_probe,
 	.setup_arch	= mpc85xx_cds_setup_arch,
 	.init_IRQ	= mpc85xx_cds_pic_init,
 	.show_cpuinfo	= mpc85xx_cds_show_cpuinfo,
 	.get_irq	= mpic_get_irq,
 #ifdef CONFIG_PCI
 	.restart	= mpc85xx_cds_restart,
 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
 #else
 	.restart	= fsl_rstcr_restart,
 #endif
 	.calibrate_decr = generic_calibrate_decr,
 	.progress	= udbg_progress,
 };
	/*
	* MPC85xx setup and early boot code plus other random bits.
	*
	* Maintained by Kumar Gala (see MAINTAINERS for contact information)
	*
	* Copyright 2005 Freescale Semiconductor Inc.
	*
	* 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.
	*/

	#include <linux/stddef.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/errno.h>
	#include <linux/reboot.h>
	#include <linux/pci.h>
	#include <linux/kdev_t.h>
	#include <linux/major.h>
	#include <linux/console.h>
	#include <linux/delay.h>
	#include <linux/seq_file.h>
	#include <linux/initrd.h>
	#include <linux/module.h>
	#include <linux/interrupt.h>
	#include <linux/fsl_devices.h>

	#include <asm/system.h>
	#include <asm/pgtable.h>
	#include <asm/page.h>
	#include <asm/atomic.h>
	#include <asm/time.h>
	#include <asm/io.h>
	#include <asm/machdep.h>
	#include <asm/ipic.h>
	#include <asm/pci-bridge.h>
	#include <asm/irq.h>
	#include <mm/mmu_decl.h>
	#include <asm/prom.h>
	#include <asm/udbg.h>
	#include <asm/mpic.h>
	#include <asm/i8259.h>

	#include <sysdev/fsl_soc.h>
	#include <sysdev/fsl_pci.h>

	/* CADMUS info */
	/* xxx - galak, move into device tree */
	#define CADMUS_BASE (0xf8004000)
	#define CADMUS_SIZE (256)
	#define CM_VER (0)
	#define CM_CSR (1)
	#define CM_RST (2)


	static int cds_pci_slot = 2;
	static volatile u8 *cadmus;

	#ifdef CONFIG_PCI

	#define ARCADIA_HOST_BRIDGE_IDSEL 17
	#define ARCADIA_2ND_BRIDGE_IDSEL 3

	static int mpc85xx_exclude_device(struct pci_controller *hose,
	u_char bus, u_char devfn)
	{
	/* We explicitly do not go past the Tundra 320 Bridge */
	if ((bus == 1) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
	return PCIBIOS_DEVICE_NOT_FOUND;
	if ((bus == 0) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
	return PCIBIOS_DEVICE_NOT_FOUND;
	else
	return PCIBIOS_SUCCESSFUL;
	}

	static void mpc85xx_cds_restart(char *cmd)
	{
	struct pci_dev *dev;
	u_char tmp;

	if ((dev = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686,
	NULL))) {

	/* Use the VIA Super Southbridge to force a PCI reset */
	pci_read_config_byte(dev, 0x47, &tmp);
	pci_write_config_byte(dev, 0x47, tmp \| 1);

	/* Flush the outbound PCI write queues */
	pci_read_config_byte(dev, 0x47, &tmp);

	/*
	* At this point, the harware reset should have triggered.
	* However, if it doesn't work for some mysterious reason,
	* just fall through to the default reset below.
	*/

	pci_dev_put(dev);
	}

	/*
	* If we can't find the VIA chip (maybe the P2P bridge is disabled)
	* or the VIA chip reset didn't work, just use the default reset.
	*/
	fsl_rstcr_restart(NULL);
	}

	static void __init mpc85xx_cds_pci_irq_fixup(struct pci_dev *dev)
	{
	u_char c;
	if (dev->vendor == PCI_VENDOR_ID_VIA) {
	switch (dev->device) {
	case PCI_DEVICE_ID_VIA_82C586_1:
	/*
	* U-Boot does not set the enable bits
	* for the IDE device. Force them on here.
	*/
	pci_read_config_byte(dev, 0x40, &c);
	c \|= 0x03; /* IDE: Chip Enable Bits */
	pci_write_config_byte(dev, 0x40, c);

	/*
	* Since only primary interface works, force the
	* IDE function to standard primary IDE interrupt
	* w/ 8259 offset
	*/
	dev->irq = 14;
	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
	break;
	/*
	* Force legacy USB interrupt routing
	*/
	case PCI_DEVICE_ID_VIA_82C586_2:
	/* There are two USB controllers.
	* Identify them by functon number
	*/
	if (PCI_FUNC(dev->devfn) == 3)
	dev->irq = 11;
	else
	dev->irq = 10;
	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
	default:
	break;
	}
	}
	}

	static void __devinit skip_fake_bridge(struct pci_dev *dev)
	{
	/* Make it an error to skip the fake bridge
	* in pci_setup_device() in probe.c */
	dev->hdr_type = 0x7f;
	}
	DECLARE_PCI_FIXUP_EARLY(0x1957, 0x3fff, skip_fake_bridge);
	DECLARE_PCI_FIXUP_EARLY(0x3fff, 0x1957, skip_fake_bridge);
	DECLARE_PCI_FIXUP_EARLY(0xff3f, 0x5719, skip_fake_bridge);

	#ifdef CONFIG_PPC_I8259
	static void mpc85xx_8259_cascade_handler(unsigned int irq,
	struct irq_desc *desc)
	{
	unsigned int cascade_irq = i8259_irq();

	if (cascade_irq != NO_IRQ)
	/* handle an interrupt from the 8259 */
	generic_handle_irq(cascade_irq);

	/* check for any interrupts from the shared IRQ line */
	handle_fasteoi_irq(irq, desc);
	}

	static irqreturn_t mpc85xx_8259_cascade_action(int irq, void *dev_id)
	{
	return IRQ_HANDLED;
	}

	static struct irqaction mpc85xxcds_8259_irqaction = {
	.handler = mpc85xx_8259_cascade_action,
	.flags = IRQF_SHARED,
	.mask = CPU_MASK_NONE,
	.name = "8259 cascade",
	};
	#endif /* PPC_I8259 */
	#endif /* CONFIG_PCI */

	static void __init mpc85xx_cds_pic_init(void)
	{
	struct mpic *mpic;
	struct resource r;
	struct device_node *np = NULL;

	np = of_find_node_by_type(np, "open-pic");

	if (np == NULL) {
	printk(KERN_ERR "Could not find open-pic node\n");
	return;
	}

	if (of_address_to_resource(np, 0, &r)) {
	printk(KERN_ERR "Failed to map mpic register space\n");
	of_node_put(np);
	return;
	}

	mpic = mpic_alloc(np, r.start,
	MPIC_PRIMARY \| MPIC_WANTS_RESET \| MPIC_BIG_ENDIAN,
	0, 256, " OpenPIC ");
	BUG_ON(mpic == NULL);

	/* Return the mpic node */
	of_node_put(np);

	mpic_init(mpic);
	}

	#if defined(CONFIG_PPC_I8259) && defined(CONFIG_PCI)
	static int mpc85xx_cds_8259_attach(void)
	{
	int ret;
	struct device_node *np = NULL;
	struct device_node *cascade_node = NULL;
	int cascade_irq;

	/* Initialize the i8259 controller */
	for_each_node_by_type(np, "interrupt-controller")
	if (of_device_is_compatible(np, "chrp,iic")) {
	cascade_node = np;
	break;
	}

	if (cascade_node == NULL) {
	printk(KERN_DEBUG "Could not find i8259 PIC\n");
	return -ENODEV;
	}

	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
	if (cascade_irq == NO_IRQ) {
	printk(KERN_ERR "Failed to map cascade interrupt\n");
	return -ENXIO;
	}

	i8259_init(cascade_node, 0);
	of_node_put(cascade_node);

	/*
	* Hook the interrupt to make sure desc->action is never NULL.
	* This is required to ensure that the interrupt does not get
	* disabled when the last user of the shared IRQ line frees their
	* interrupt.
	*/
	if ((ret = setup_irq(cascade_irq, &mpc85xxcds_8259_irqaction))) {
	printk(KERN_ERR "Failed to setup cascade interrupt\n");
	return ret;
	}

	/* Success. Connect our low-level cascade handler. */
	set_irq_handler(cascade_irq, mpc85xx_8259_cascade_handler);

	return 0;
	}
	machine_device_initcall(mpc85xx_cds, mpc85xx_cds_8259_attach);

	#endif /* CONFIG_PPC_I8259 */

	/*
	* Setup the architecture
	*/
	static void __init mpc85xx_cds_setup_arch(void)
	{
	#ifdef CONFIG_PCI
	struct device_node *np;
	#endif

	if (ppc_md.progress)
	ppc_md.progress("mpc85xx_cds_setup_arch()", 0);

	cadmus = ioremap(CADMUS_BASE, CADMUS_SIZE);
	cds_pci_slot = ((cadmus[CM_CSR] >> 6) & 0x3) + 1;

	if (ppc_md.progress) {
	char buf[40];
	snprintf(buf, 40, "CDS Version = 0x%x in slot %d\n",
	cadmus[CM_VER], cds_pci_slot);
	ppc_md.progress(buf, 0);
	}

	#ifdef CONFIG_PCI
	for_each_node_by_type(np, "pci") {
	if (of_device_is_compatible(np, "fsl,mpc8540-pci") \|\|
	of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
	struct resource rsrc;
	of_address_to_resource(np, 0, &rsrc);
	if ((rsrc.start & 0xfffff) == 0x8000)
	fsl_add_bridge(np, 1);
	else
	fsl_add_bridge(np, 0);
	}
	}

	ppc_md.pci_irq_fixup = mpc85xx_cds_pci_irq_fixup;
	ppc_md.pci_exclude_device = mpc85xx_exclude_device;
	#endif
	}

	static void mpc85xx_cds_show_cpuinfo(struct seq_file *m)
	{
	uint pvid, svid, phid1;
	uint memsize = total_memory;

	pvid = mfspr(SPRN_PVR);
	svid = mfspr(SPRN_SVR);

	seq_printf(m, "Vendor\t\t: Freescale Semiconductor\n");
	seq_printf(m, "Machine\t\t: MPC85xx CDS (0x%x)\n", cadmus[CM_VER]);
	seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
	seq_printf(m, "SVR\t\t: 0x%x\n", svid);

	/* Display cpu Pll setting */
	phid1 = mfspr(SPRN_HID1);
	seq_printf(m, "PLL setting\t: 0x%x\n", ((phid1 >> 24) & 0x3f));

	/* Display the amount of memory */
	seq_printf(m, "Memory\t\t: %d MB\n", memsize / (1024 * 1024));
	}


	/*
	* Called very early, device-tree isn't unflattened
	*/
	static int __init mpc85xx_cds_probe(void)
	{
	unsigned long root = of_get_flat_dt_root();

	return of_flat_dt_is_compatible(root, "MPC85xxCDS");
	}

	define_machine(mpc85xx_cds) {
	.name = "MPC85xx CDS",
	.probe = mpc85xx_cds_probe,
	.setup_arch = mpc85xx_cds_setup_arch,
	.init_IRQ = mpc85xx_cds_pic_init,
	.show_cpuinfo = mpc85xx_cds_show_cpuinfo,
	.get_irq = mpic_get_irq,
	#ifdef CONFIG_PCI
	.restart = mpc85xx_cds_restart,
	.pcibios_fixup_bus = fsl_pcibios_fixup_bus,
	#else
	.restart = fsl_rstcr_restart,
	#endif
	.calibrate_decr = generic_calibrate_decr,
	.progress = udbg_progress,
	};