arch/arm/mach-ks8695/pci.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * arch/arm/mach-ks8695/pci.c
  *
  *  Copyright (C) 2003, Micrel Semiconductors
  *  Copyright (C) 2006, Greg Ungerer <gerg@snapgear.com>
  *  Copyright (C) 2006, Ben Dooks
  *  Copyright (C) 2007, Andrew Victor
  */

 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/mm.h>
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/delay.h>
 #include <linux/io.h>

 #include <asm/signal.h>
 #include <asm/mach/pci.h>
 #include <mach/hardware.h>

 #include "devices.h"
 #include "regs-pci.h"


 static int pci_dbg;

 static void ks8695_pci_setupconfig(unsigned int bus_nr, unsigned int devfn, unsigned int where)
 {
 	unsigned long pbca;

 	pbca = PBCA_ENABLE | (where & ~3);
 	pbca |= PCI_SLOT(devfn) << 11 ;
 	pbca |= PCI_FUNC(devfn) << 8;
 	pbca |= bus_nr << 16;

 	if (bus_nr == 0) {
 		/* use Type-0 transaction */
 		__raw_writel(pbca, KS8695_PCI_VA + KS8695_PBCA);
 	} else {
 		/* use Type-1 transaction */
 		__raw_writel(pbca | PBCA_TYPE1, KS8695_PCI_VA + KS8695_PBCA);
 	}
 }

 static void __iomem *ks8695_pci_map_bus(struct pci_bus *bus, unsigned int devfn,
 					int where)
 {
 	ks8695_pci_setupconfig(bus->number, devfn, where);
 	return KS8695_PCI_VA +  KS8695_PBCD;
 }

 static void ks8695_local_writeconfig(int where, u32 value)
 {
 	ks8695_pci_setupconfig(0, 0, where);
 	__raw_writel(value, KS8695_PCI_VA + KS8695_PBCD);
 }

 static struct pci_ops ks8695_pci_ops = {
 	.map_bus = ks8695_pci_map_bus,
 	.read	= pci_generic_config_read32,
 	.write	= pci_generic_config_write32,
 };

 static struct resource pci_mem = {
 	.name	= "PCI Memory space",
 	.start	= KS8695_PCIMEM_PA,
 	.end	= KS8695_PCIMEM_PA + (KS8695_PCIMEM_SIZE - 1),
 	.flags	= IORESOURCE_MEM,
 };

 static struct resource pci_io = {
 	.name	= "PCI IO space",
 	.start	= KS8695_PCIIO_PA,
 	.end	= KS8695_PCIIO_PA + (KS8695_PCIIO_SIZE - 1),
 	.flags	= IORESOURCE_IO,
 };

 static int __init ks8695_pci_setup(int nr, struct pci_sys_data *sys)
 {
 	if (nr > 0)
 		return 0;

 	request_resource(&iomem_resource, &pci_mem);
 	request_resource(&ioport_resource, &pci_io);

 	pci_add_resource_offset(&sys->resources, &pci_io, sys->io_offset);
 	pci_add_resource_offset(&sys->resources, &pci_mem, sys->mem_offset);

 	/* Assign and enable processor bridge */
 	ks8695_local_writeconfig(PCI_BASE_ADDRESS_0, KS8695_PCIMEM_PA);

 	/* Enable bus-master & Memory Space access */
 	ks8695_local_writeconfig(PCI_COMMAND, PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);

 	/* Set cache-line size & latency. */
 	ks8695_local_writeconfig(PCI_CACHE_LINE_SIZE, (32 << 8) | (L1_CACHE_BYTES / sizeof(u32)));

 	/* Reserve PCI memory space for PCI-AHB resources */
 	if (!request_mem_region(KS8695_PCIMEM_PA, SZ_64M, "PCI-AHB Bridge")) {
 		printk(KERN_ERR "Cannot allocate PCI-AHB Bridge memory.\n");
 		return -EBUSY;
 	}

 	return 1;
 }

 static inline unsigned int size_mask(unsigned long size)
 {
 	return (~size) + 1;
 }

 static int ks8695_pci_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 {
 	unsigned long pc = instruction_pointer(regs);
 	unsigned long instr = *(unsigned long *)pc;
 	unsigned long cmdstat;

 	cmdstat = __raw_readl(KS8695_PCI_VA + KS8695_CRCFCS);

 	printk(KERN_ERR "PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx [%s%s%s%s%s]\n",
 		addr, fsr, regs->ARM_pc, regs->ARM_lr,
 		cmdstat & (PCI_STATUS_SIG_TARGET_ABORT << 16) ? "GenTarget" : " ",
 		cmdstat & (PCI_STATUS_REC_TARGET_ABORT << 16) ? "RecvTarget" : " ",
 		cmdstat & (PCI_STATUS_REC_MASTER_ABORT << 16) ? "MasterAbort" : " ",
 		cmdstat & (PCI_STATUS_SIG_SYSTEM_ERROR << 16) ? "SysError" : " ",
 		cmdstat & (PCI_STATUS_DETECTED_PARITY << 16)  ? "Parity" : " "
 	);

 	__raw_writel(cmdstat, KS8695_PCI_VA + KS8695_CRCFCS);

 	/*
 	 * If the instruction being executed was a read,
 	 * make it look like it read all-ones.
 	 */
 	if ((instr & 0x0c100000) == 0x04100000) {
 		int reg = (instr >> 12) & 15;
 		unsigned long val;

 		if (instr & 0x00400000)
 			val = 255;
 		else
 			val = -1;

 		regs->uregs[reg] = val;
 		regs->ARM_pc += 4;
 		return 0;
 	}

 	if ((instr & 0x0e100090) == 0x00100090) {
 		int reg = (instr >> 12) & 15;

 		regs->uregs[reg] = -1;
 		regs->ARM_pc += 4;
 		return 0;
 	}

 	return 1;
 }

 static void __init ks8695_pci_preinit(void)
 {
 	/* make software reset to avoid freeze if PCI bus was messed up */
 	__raw_writel(0x80000000, KS8695_PCI_VA + KS8695_PBCS);

 	/* stage 1 initialization, subid, subdevice = 0x0001 */
 	__raw_writel(0x00010001, KS8695_PCI_VA + KS8695_CRCSID);

 	/* stage 2 initialization */
 	/* prefetch limits with 16 words, retry enable */
 	__raw_writel(0x40000000, KS8695_PCI_VA + KS8695_PBCS);

 	/* configure memory mapping */
 	__raw_writel(KS8695_PCIMEM_PA, KS8695_PCI_VA + KS8695_PMBA);
 	__raw_writel(size_mask(KS8695_PCIMEM_SIZE), KS8695_PCI_VA + KS8695_PMBAM);
 	__raw_writel(KS8695_PCIMEM_PA, KS8695_PCI_VA + KS8695_PMBAT);
 	__raw_writel(0, KS8695_PCI_VA + KS8695_PMBAC);

 	/* configure IO mapping */
 	__raw_writel(KS8695_PCIIO_PA, KS8695_PCI_VA + KS8695_PIOBA);
 	__raw_writel(size_mask(KS8695_PCIIO_SIZE), KS8695_PCI_VA + KS8695_PIOBAM);
 	__raw_writel(KS8695_PCIIO_PA, KS8695_PCI_VA + KS8695_PIOBAT);
 	__raw_writel(0, KS8695_PCI_VA + KS8695_PIOBAC);

 	/* hook in fault handlers */
 	hook_fault_code(8, ks8695_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
 	hook_fault_code(10, ks8695_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
 }

 static void ks8695_show_pciregs(void)
 {
 	if (!pci_dbg)
 		return;

 	printk(KERN_INFO "PCI: CRCFID = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFID));
 	printk(KERN_INFO "PCI: CRCFCS = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFCS));
 	printk(KERN_INFO "PCI: CRCFRV = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFRV));
 	printk(KERN_INFO "PCI: CRCFLT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFLT));
 	printk(KERN_INFO "PCI: CRCBMA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCBMA));
 	printk(KERN_INFO "PCI: CRCSID = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCSID));
 	printk(KERN_INFO "PCI: CRCFIT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFIT));

 	printk(KERN_INFO "PCI: PBM    = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PBM));
 	printk(KERN_INFO "PCI: PBCS   = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PBCS));

 	printk(KERN_INFO "PCI: PMBA   = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBA));
 	printk(KERN_INFO "PCI: PMBAC  = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAC));
 	printk(KERN_INFO "PCI: PMBAM  = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAM));
 	printk(KERN_INFO "PCI: PMBAT  = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAT));

 	printk(KERN_INFO "PCI: PIOBA  = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBA));
 	printk(KERN_INFO "PCI: PIOBAC = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAC));
 	printk(KERN_INFO "PCI: PIOBAM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAM));
 	printk(KERN_INFO "PCI: PIOBAT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAT));
 }


 static struct hw_pci ks8695_pci __initdata = {
 	.nr_controllers	= 1,
 	.ops		= &ks8695_pci_ops,
 	.preinit	= ks8695_pci_preinit,
 	.setup		= ks8695_pci_setup,
 	.postinit	= NULL,
 	.map_irq	= NULL,
 };

 void __init ks8695_init_pci(struct ks8695_pci_cfg *cfg)
 {
 	if (__raw_readl(KS8695_PCI_VA + KS8695_CRCFRV) & CFRV_GUEST) {
 		printk("PCI: KS8695 in guest mode, not initialising\n");
 		return;
 	}

 	pcibios_min_io = 0;
 	pcibios_min_mem = 0;

 	printk(KERN_INFO "PCI: Initialising\n");
 	ks8695_show_pciregs();

 	/* set Mode */
 	__raw_writel(cfg->mode << 29, KS8695_PCI_VA + KS8695_PBM);

 	ks8695_pci.map_irq = cfg->map_irq;	/* board-specific map_irq method */

 	pci_common_init(&ks8695_pci);
 }
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* arch/arm/mach-ks8695/pci.c
	*
	* Copyright (C) 2003, Micrel Semiconductors
	* Copyright (C) 2006, Greg Ungerer <gerg@snapgear.com>
	* Copyright (C) 2006, Ben Dooks
	* Copyright (C) 2007, Andrew Victor
	*/

	#include <linux/kernel.h>
	#include <linux/pci.h>
	#include <linux/mm.h>
	#include <linux/init.h>
	#include <linux/irq.h>
	#include <linux/delay.h>
	#include <linux/io.h>

	#include <asm/signal.h>
	#include <asm/mach/pci.h>
	#include <mach/hardware.h>

	#include "devices.h"
	#include "regs-pci.h"


	static int pci_dbg;

	static void ks8695_pci_setupconfig(unsigned int bus_nr, unsigned int devfn, unsigned int where)
	{
	unsigned long pbca;

	pbca = PBCA_ENABLE \| (where & ~3);
	pbca \|= PCI_SLOT(devfn) << 11 ;
	pbca \|= PCI_FUNC(devfn) << 8;
	pbca \|= bus_nr << 16;

	if (bus_nr == 0) {
	/* use Type-0 transaction */
	__raw_writel(pbca, KS8695_PCI_VA + KS8695_PBCA);
	} else {
	/* use Type-1 transaction */
	__raw_writel(pbca \| PBCA_TYPE1, KS8695_PCI_VA + KS8695_PBCA);
	}
	}

	static void __iomem ks8695_pci_map_bus(struct pci_bus bus, unsigned int devfn,
	int where)
	{
	ks8695_pci_setupconfig(bus->number, devfn, where);
	return KS8695_PCI_VA + KS8695_PBCD;
	}

	static void ks8695_local_writeconfig(int where, u32 value)
	{
	ks8695_pci_setupconfig(0, 0, where);
	__raw_writel(value, KS8695_PCI_VA + KS8695_PBCD);
	}

	static struct pci_ops ks8695_pci_ops = {
	.map_bus = ks8695_pci_map_bus,
	.read = pci_generic_config_read32,
	.write = pci_generic_config_write32,
	};

	static struct resource pci_mem = {
	.name = "PCI Memory space",
	.start = KS8695_PCIMEM_PA,
	.end = KS8695_PCIMEM_PA + (KS8695_PCIMEM_SIZE - 1),
	.flags = IORESOURCE_MEM,
	};

	static struct resource pci_io = {
	.name = "PCI IO space",
	.start = KS8695_PCIIO_PA,
	.end = KS8695_PCIIO_PA + (KS8695_PCIIO_SIZE - 1),
	.flags = IORESOURCE_IO,
	};

	static int __init ks8695_pci_setup(int nr, struct pci_sys_data *sys)
	{
	if (nr > 0)
	return 0;

	request_resource(&iomem_resource, &pci_mem);
	request_resource(&ioport_resource, &pci_io);

	pci_add_resource_offset(&sys->resources, &pci_io, sys->io_offset);
	pci_add_resource_offset(&sys->resources, &pci_mem, sys->mem_offset);

	/* Assign and enable processor bridge */
	ks8695_local_writeconfig(PCI_BASE_ADDRESS_0, KS8695_PCIMEM_PA);

	/* Enable bus-master & Memory Space access */
	ks8695_local_writeconfig(PCI_COMMAND, PCI_COMMAND_MASTER \| PCI_COMMAND_MEMORY);

	/* Set cache-line size & latency. */
	ks8695_local_writeconfig(PCI_CACHE_LINE_SIZE, (32 << 8) \| (L1_CACHE_BYTES / sizeof(u32)));

	/* Reserve PCI memory space for PCI-AHB resources */
	if (!request_mem_region(KS8695_PCIMEM_PA, SZ_64M, "PCI-AHB Bridge")) {
	printk(KERN_ERR "Cannot allocate PCI-AHB Bridge memory.\n");
	return -EBUSY;
	}

	return 1;
	}

	static inline unsigned int size_mask(unsigned long size)
	{
	return (~size) + 1;
	}

	static int ks8695_pci_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
	{
	unsigned long pc = instruction_pointer(regs);
	unsigned long instr = (unsigned long )pc;
	unsigned long cmdstat;

	cmdstat = __raw_readl(KS8695_PCI_VA + KS8695_CRCFCS);

	printk(KERN_ERR "PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx [%s%s%s%s%s]\n",
	addr, fsr, regs->ARM_pc, regs->ARM_lr,
	cmdstat & (PCI_STATUS_SIG_TARGET_ABORT << 16) ? "GenTarget" : " ",
	cmdstat & (PCI_STATUS_REC_TARGET_ABORT << 16) ? "RecvTarget" : " ",
	cmdstat & (PCI_STATUS_REC_MASTER_ABORT << 16) ? "MasterAbort" : " ",
	cmdstat & (PCI_STATUS_SIG_SYSTEM_ERROR << 16) ? "SysError" : " ",
	cmdstat & (PCI_STATUS_DETECTED_PARITY << 16) ? "Parity" : " "
	);

	__raw_writel(cmdstat, KS8695_PCI_VA + KS8695_CRCFCS);

	/*
	* If the instruction being executed was a read,
	* make it look like it read all-ones.
	*/
	if ((instr & 0x0c100000) == 0x04100000) {
	int reg = (instr >> 12) & 15;
	unsigned long val;

	if (instr & 0x00400000)
	val = 255;
	else
	val = -1;

	regs->uregs[reg] = val;
	regs->ARM_pc += 4;
	return 0;
	}

	if ((instr & 0x0e100090) == 0x00100090) {
	int reg = (instr >> 12) & 15;

	regs->uregs[reg] = -1;
	regs->ARM_pc += 4;
	return 0;
	}

	return 1;
	}

	static void __init ks8695_pci_preinit(void)
	{
	/* make software reset to avoid freeze if PCI bus was messed up */
	__raw_writel(0x80000000, KS8695_PCI_VA + KS8695_PBCS);

	/* stage 1 initialization, subid, subdevice = 0x0001 */
	__raw_writel(0x00010001, KS8695_PCI_VA + KS8695_CRCSID);

	/* stage 2 initialization */
	/* prefetch limits with 16 words, retry enable */
	__raw_writel(0x40000000, KS8695_PCI_VA + KS8695_PBCS);

	/* configure memory mapping */
	__raw_writel(KS8695_PCIMEM_PA, KS8695_PCI_VA + KS8695_PMBA);
	__raw_writel(size_mask(KS8695_PCIMEM_SIZE), KS8695_PCI_VA + KS8695_PMBAM);
	__raw_writel(KS8695_PCIMEM_PA, KS8695_PCI_VA + KS8695_PMBAT);
	__raw_writel(0, KS8695_PCI_VA + KS8695_PMBAC);

	/* configure IO mapping */
	__raw_writel(KS8695_PCIIO_PA, KS8695_PCI_VA + KS8695_PIOBA);
	__raw_writel(size_mask(KS8695_PCIIO_SIZE), KS8695_PCI_VA + KS8695_PIOBAM);
	__raw_writel(KS8695_PCIIO_PA, KS8695_PCI_VA + KS8695_PIOBAT);
	__raw_writel(0, KS8695_PCI_VA + KS8695_PIOBAC);

	/* hook in fault handlers */
	hook_fault_code(8, ks8695_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
	hook_fault_code(10, ks8695_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
	}

	static void ks8695_show_pciregs(void)
	{
	if (!pci_dbg)
	return;

	printk(KERN_INFO "PCI: CRCFID = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFID));
	printk(KERN_INFO "PCI: CRCFCS = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFCS));
	printk(KERN_INFO "PCI: CRCFRV = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFRV));
	printk(KERN_INFO "PCI: CRCFLT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFLT));
	printk(KERN_INFO "PCI: CRCBMA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCBMA));
	printk(KERN_INFO "PCI: CRCSID = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCSID));
	printk(KERN_INFO "PCI: CRCFIT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFIT));

	printk(KERN_INFO "PCI: PBM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PBM));
	printk(KERN_INFO "PCI: PBCS = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PBCS));

	printk(KERN_INFO "PCI: PMBA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBA));
	printk(KERN_INFO "PCI: PMBAC = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAC));
	printk(KERN_INFO "PCI: PMBAM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAM));
	printk(KERN_INFO "PCI: PMBAT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAT));

	printk(KERN_INFO "PCI: PIOBA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBA));
	printk(KERN_INFO "PCI: PIOBAC = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAC));
	printk(KERN_INFO "PCI: PIOBAM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAM));
	printk(KERN_INFO "PCI: PIOBAT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAT));
	}


	static struct hw_pci ks8695_pci __initdata = {
	.nr_controllers = 1,
	.ops = &ks8695_pci_ops,
	.preinit = ks8695_pci_preinit,
	.setup = ks8695_pci_setup,
	.postinit = NULL,
	.map_irq = NULL,
	};

	void __init ks8695_init_pci(struct ks8695_pci_cfg *cfg)
	{
	if (__raw_readl(KS8695_PCI_VA + KS8695_CRCFRV) & CFRV_GUEST) {
	printk("PCI: KS8695 in guest mode, not initialising\n");
	return;
	}

	pcibios_min_io = 0;
	pcibios_min_mem = 0;

	printk(KERN_INFO "PCI: Initialising\n");
	ks8695_show_pciregs();

	/* set Mode */
	__raw_writel(cfg->mode << 29, KS8695_PCI_VA + KS8695_PBM);

	ks8695_pci.map_irq = cfg->map_irq; /* board-specific map_irq method */

	pci_common_init(&ks8695_pci);
	}