arch/m68k/coldfire/pci.c - linux - Git at Google

 /*
  * pci.c -- PCI bus support for ColdFire processors
  *
  * (C) Copyright 2012, Greg Ungerer <gerg@uclinux.com>
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file COPYING in the main directory of this archive
  * for more details.
  */

 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/io.h>
 #include <linux/pci.h>
 #include <linux/delay.h>
 #include <asm/coldfire.h>
 #include <asm/mcfsim.h>
 #include <asm/m54xxpci.h>

 /*
  * Memory and IO mappings. We use a 1:1 mapping for local host memory to
  * PCI bus memory (no reason not to really). IO space is mapped in its own
  * separate address region. The device configuration space is mapped over
  * the IO map space when we enable it in the PCICAR register.
  */
 static struct pci_bus *rootbus;
 static unsigned long iospace;

 /*
  * We need to be carefull probing on bus 0 (directly connected to host
  * bridge). We should only access the well defined possible devices in
  * use, ignore aliases and the like.
  */
 static unsigned char mcf_host_slot2sid[32] = {
 	0, 0, 0, 0, 0, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
 	0, 1, 2, 0, 3, 4, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
 };

 static unsigned char mcf_host_irq[] = {
 	0, 69, 69, 71, 71,
 };

 /*
  * Configuration space access functions. Configuration space access is
  * through the IO mapping window, enabling it via the PCICAR register.
  */
 static unsigned long mcf_mk_pcicar(int bus, unsigned int devfn, int where)
 {
 	return (bus << PCICAR_BUSN) | (devfn << PCICAR_DEVFNN) | (where & 0xfc);
 }

 static int mcf_pci_readconfig(struct pci_bus *bus, unsigned int devfn,
 	int where, int size, u32 *value)
 {
 	unsigned long addr;

 	*value = 0xffffffff;

 	if (bus->number == 0) {
 		if (mcf_host_slot2sid[PCI_SLOT(devfn)] == 0)
 			return PCIBIOS_SUCCESSFUL;
 	}

 	addr = mcf_mk_pcicar(bus->number, devfn, where);
 	__raw_writel(PCICAR_E | addr, PCICAR);
 	__raw_readl(PCICAR);
 	addr = iospace + (where & 0x3);

 	switch (size) {
 	case 1:
 		*value = __raw_readb(addr);
 		break;
 	case 2:
 		*value = le16_to_cpu(__raw_readw(addr));
 		break;
 	default:
 		*value = le32_to_cpu(__raw_readl(addr));
 		break;
 	}

 	__raw_writel(0, PCICAR);
 	__raw_readl(PCICAR);
 	return PCIBIOS_SUCCESSFUL;
 }

 static int mcf_pci_writeconfig(struct pci_bus *bus, unsigned int devfn,
 	int where, int size, u32 value)
 {
 	unsigned long addr;

 	if (bus->number == 0) {
 		if (mcf_host_slot2sid[PCI_SLOT(devfn)] == 0)
 			return PCIBIOS_SUCCESSFUL;
 	}

 	addr = mcf_mk_pcicar(bus->number, devfn, where);
 	__raw_writel(PCICAR_E | addr, PCICAR);
 	__raw_readl(PCICAR);
 	addr = iospace + (where & 0x3);

 	switch (size) {
 	case 1:
 		 __raw_writeb(value, addr);
 		break;
 	case 2:
 		__raw_writew(cpu_to_le16(value), addr);
 		break;
 	default:
 		__raw_writel(cpu_to_le32(value), addr);
 		break;
 	}

 	__raw_writel(0, PCICAR);
 	__raw_readl(PCICAR);
 	return PCIBIOS_SUCCESSFUL;
 }

 static struct pci_ops mcf_pci_ops = {
 	.read	= mcf_pci_readconfig,
 	.write	= mcf_pci_writeconfig,
 };

 /*
  * Initialize the PCI bus registers, and scan the bus.
  */
 static struct resource mcf_pci_mem = {
 	.name	= "PCI Memory space",
 	.start	= PCI_MEM_PA,
 	.end	= PCI_MEM_PA + PCI_MEM_SIZE - 1,
 	.flags	= IORESOURCE_MEM,
 };

 static struct resource mcf_pci_io = {
 	.name	= "PCI IO space",
 	.start	= 0x400,
 	.end	= 0x10000 - 1,
 	.flags	= IORESOURCE_IO,
 };

 static struct resource busn_resource = {
 	.name	= "PCI busn",
 	.start	= 0,
 	.end	= 255,
 	.flags	= IORESOURCE_BUS,
 };

 /*
  * Interrupt mapping and setting.
  */
 static int mcf_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 {
 	int sid;

 	sid = mcf_host_slot2sid[slot];
 	if (sid)
 		return mcf_host_irq[sid];
 	return 0;
 }

 static int __init mcf_pci_init(void)
 {
 	struct pci_host_bridge *bridge;
 	int ret;

 	bridge = pci_alloc_host_bridge(0);
 	if (!bridge)
 		return -ENOMEM;

 	pr_info("ColdFire: PCI bus initialization...\n");

 	/* Reset the external PCI bus */
 	__raw_writel(PCIGSCR_RESET, PCIGSCR);
 	__raw_writel(0, PCITCR);

 	request_resource(&iomem_resource, &mcf_pci_mem);
 	request_resource(&iomem_resource, &mcf_pci_io);

 	/* Configure PCI arbiter */
 	__raw_writel(PACR_INTMPRI | PACR_INTMINTE | PACR_EXTMPRI(0x1f) |
 		PACR_EXTMINTE(0x1f), PACR);

 	/* Set required multi-function pins for PCI bus use */
 	__raw_writew(0x3ff, MCFGPIO_PAR_PCIBG);
 	__raw_writew(0x3ff, MCFGPIO_PAR_PCIBR);

 	/* Set up config space for local host bus controller */
 	__raw_writel(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
 		PCI_COMMAND_INVALIDATE, PCISCR);
 	__raw_writel(PCICR1_LT(32) | PCICR1_CL(8), PCICR1);
 	__raw_writel(0, PCICR2);

 	/*
 	 * Set up the initiator windows for memory and IO mapping.
 	 * These give the CPU bus access onto the PCI bus. One for each of
 	 * PCI memory and IO address spaces.
 	 */
 	__raw_writel(WXBTAR(PCI_MEM_PA, PCI_MEM_BA, PCI_MEM_SIZE),
 		PCIIW0BTAR);
 	__raw_writel(WXBTAR(PCI_IO_PA, PCI_IO_BA, PCI_IO_SIZE),
 		PCIIW1BTAR);
 	__raw_writel(PCIIWCR_W0_MEM /*| PCIIWCR_W0_MRDL*/ | PCIIWCR_W0_E |
 		PCIIWCR_W1_IO | PCIIWCR_W1_E, PCIIWCR);

 	/*
 	 * Set up the target windows for access from the PCI bus back to the
 	 * CPU bus. All we need is access to system RAM (for mastering).
 	 */
 	__raw_writel(CONFIG_RAMBASE, PCIBAR1);
 	__raw_writel(CONFIG_RAMBASE | PCITBATR1_E, PCITBATR1);

 	/* Keep a virtual mapping to IO/config space active */
 	iospace = (unsigned long) ioremap(PCI_IO_PA, PCI_IO_SIZE);
 	if (iospace == 0) {
 		pci_free_host_bridge(bridge);
 		return -ENODEV;
 	}
 	pr_info("Coldfire: PCI IO/config window mapped to 0x%x\n",
 		(u32) iospace);

 	/* Turn of PCI reset, and wait for devices to settle */
 	__raw_writel(0, PCIGSCR);
 	set_current_state(TASK_UNINTERRUPTIBLE);
 	schedule_timeout(msecs_to_jiffies(200));


 	pci_add_resource(&bridge->windows, &ioport_resource);
 	pci_add_resource(&bridge->windows, &iomem_resource);
 	pci_add_resource(&bridge->windows, &busn_resource);
 	bridge->dev.parent = NULL;
 	bridge->sysdata = NULL;
 	bridge->busnr = 0;
 	bridge->ops = &mcf_pci_ops;
 	bridge->swizzle_irq = pci_common_swizzle;
 	bridge->map_irq = mcf_pci_map_irq;

 	ret = pci_scan_root_bus_bridge(bridge);
 	if (ret) {
 		pci_free_host_bridge(bridge);
 		return ret;
 	}

 	rootbus = bridge->bus;

 	rootbus->resource[0] = &mcf_pci_io;
 	rootbus->resource[1] = &mcf_pci_mem;

 	pci_bus_size_bridges(rootbus);
 	pci_bus_assign_resources(rootbus);
 	pci_bus_add_devices(rootbus);
 	return 0;
 }

 subsys_initcall(mcf_pci_init);
	/*
	* pci.c -- PCI bus support for ColdFire processors
	*
	* (C) Copyright 2012, Greg Ungerer <gerg@uclinux.com>
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file COPYING in the main directory of this archive
	* for more details.
	*/

	#include <linux/types.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/io.h>
	#include <linux/pci.h>
	#include <linux/delay.h>
	#include <asm/coldfire.h>
	#include <asm/mcfsim.h>
	#include <asm/m54xxpci.h>

	/*
	* Memory and IO mappings. We use a 1:1 mapping for local host memory to
	* PCI bus memory (no reason not to really). IO space is mapped in its own
	* separate address region. The device configuration space is mapped over
	* the IO map space when we enable it in the PCICAR register.
	*/
	static struct pci_bus *rootbus;
	static unsigned long iospace;

	/*
	* We need to be carefull probing on bus 0 (directly connected to host
	* bridge). We should only access the well defined possible devices in
	* use, ignore aliases and the like.
	*/
	static unsigned char mcf_host_slot2sid[32] = {
	0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0,
	0, 1, 2, 0, 3, 4, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0,
	};

	static unsigned char mcf_host_irq[] = {
	0, 69, 69, 71, 71,
	};

	/*
	* Configuration space access functions. Configuration space access is
	* through the IO mapping window, enabling it via the PCICAR register.
	*/
	static unsigned long mcf_mk_pcicar(int bus, unsigned int devfn, int where)
	{
	return (bus << PCICAR_BUSN) \| (devfn << PCICAR_DEVFNN) \| (where & 0xfc);
	}

	static int mcf_pci_readconfig(struct pci_bus *bus, unsigned int devfn,
	int where, int size, u32 *value)
	{
	unsigned long addr;

	*value = 0xffffffff;

	if (bus->number == 0) {
	if (mcf_host_slot2sid[PCI_SLOT(devfn)] == 0)
	return PCIBIOS_SUCCESSFUL;
	}

	addr = mcf_mk_pcicar(bus->number, devfn, where);
	__raw_writel(PCICAR_E \| addr, PCICAR);
	__raw_readl(PCICAR);
	addr = iospace + (where & 0x3);

	switch (size) {
	case 1:
	*value = __raw_readb(addr);
	break;
	case 2:
	*value = le16_to_cpu(__raw_readw(addr));
	break;
	default:
	*value = le32_to_cpu(__raw_readl(addr));
	break;
	}

	__raw_writel(0, PCICAR);
	__raw_readl(PCICAR);
	return PCIBIOS_SUCCESSFUL;
	}

	static int mcf_pci_writeconfig(struct pci_bus *bus, unsigned int devfn,
	int where, int size, u32 value)
	{
	unsigned long addr;

	if (bus->number == 0) {
	if (mcf_host_slot2sid[PCI_SLOT(devfn)] == 0)
	return PCIBIOS_SUCCESSFUL;
	}

	addr = mcf_mk_pcicar(bus->number, devfn, where);
	__raw_writel(PCICAR_E \| addr, PCICAR);
	__raw_readl(PCICAR);
	addr = iospace + (where & 0x3);

	switch (size) {
	case 1:
	__raw_writeb(value, addr);
	break;
	case 2:
	__raw_writew(cpu_to_le16(value), addr);
	break;
	default:
	__raw_writel(cpu_to_le32(value), addr);
	break;
	}

	__raw_writel(0, PCICAR);
	__raw_readl(PCICAR);
	return PCIBIOS_SUCCESSFUL;
	}

	static struct pci_ops mcf_pci_ops = {
	.read = mcf_pci_readconfig,
	.write = mcf_pci_writeconfig,
	};

	/*
	* Initialize the PCI bus registers, and scan the bus.
	*/
	static struct resource mcf_pci_mem = {
	.name = "PCI Memory space",
	.start = PCI_MEM_PA,
	.end = PCI_MEM_PA + PCI_MEM_SIZE - 1,
	.flags = IORESOURCE_MEM,
	};

	static struct resource mcf_pci_io = {
	.name = "PCI IO space",
	.start = 0x400,
	.end = 0x10000 - 1,
	.flags = IORESOURCE_IO,
	};

	static struct resource busn_resource = {
	.name = "PCI busn",
	.start = 0,
	.end = 255,
	.flags = IORESOURCE_BUS,
	};

	/*
	* Interrupt mapping and setting.
	*/
	static int mcf_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
	{
	int sid;

	sid = mcf_host_slot2sid[slot];
	if (sid)
	return mcf_host_irq[sid];
	return 0;
	}

	static int __init mcf_pci_init(void)
	{
	struct pci_host_bridge *bridge;
	int ret;

	bridge = pci_alloc_host_bridge(0);
	if (!bridge)
	return -ENOMEM;

	pr_info("ColdFire: PCI bus initialization...\n");

	/* Reset the external PCI bus */
	__raw_writel(PCIGSCR_RESET, PCIGSCR);
	__raw_writel(0, PCITCR);

	request_resource(&iomem_resource, &mcf_pci_mem);
	request_resource(&iomem_resource, &mcf_pci_io);

	/* Configure PCI arbiter */
	__raw_writel(PACR_INTMPRI \| PACR_INTMINTE \| PACR_EXTMPRI(0x1f) \|
	PACR_EXTMINTE(0x1f), PACR);

	/* Set required multi-function pins for PCI bus use */
	__raw_writew(0x3ff, MCFGPIO_PAR_PCIBG);
	__raw_writew(0x3ff, MCFGPIO_PAR_PCIBR);

	/* Set up config space for local host bus controller */
	__raw_writel(PCI_COMMAND_MEMORY \| PCI_COMMAND_MASTER \|
	PCI_COMMAND_INVALIDATE, PCISCR);
	__raw_writel(PCICR1_LT(32) \| PCICR1_CL(8), PCICR1);
	__raw_writel(0, PCICR2);

	/*
	* Set up the initiator windows for memory and IO mapping.
	* These give the CPU bus access onto the PCI bus. One for each of
	* PCI memory and IO address spaces.
	*/
	__raw_writel(WXBTAR(PCI_MEM_PA, PCI_MEM_BA, PCI_MEM_SIZE),
	PCIIW0BTAR);
	__raw_writel(WXBTAR(PCI_IO_PA, PCI_IO_BA, PCI_IO_SIZE),
	PCIIW1BTAR);
	__raw_writel(PCIIWCR_W0_MEM /\| PCIIWCR_W0_MRDL/ \| PCIIWCR_W0_E \|
	PCIIWCR_W1_IO \| PCIIWCR_W1_E, PCIIWCR);

	/*
	* Set up the target windows for access from the PCI bus back to the
	* CPU bus. All we need is access to system RAM (for mastering).
	*/
	__raw_writel(CONFIG_RAMBASE, PCIBAR1);
	__raw_writel(CONFIG_RAMBASE \| PCITBATR1_E, PCITBATR1);

	/* Keep a virtual mapping to IO/config space active */
	iospace = (unsigned long) ioremap(PCI_IO_PA, PCI_IO_SIZE);
	if (iospace == 0) {
	pci_free_host_bridge(bridge);
	return -ENODEV;
	}
	pr_info("Coldfire: PCI IO/config window mapped to 0x%x\n",
	(u32) iospace);

	/* Turn of PCI reset, and wait for devices to settle */
	__raw_writel(0, PCIGSCR);
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule_timeout(msecs_to_jiffies(200));


	pci_add_resource(&bridge->windows, &ioport_resource);
	pci_add_resource(&bridge->windows, &iomem_resource);
	pci_add_resource(&bridge->windows, &busn_resource);
	bridge->dev.parent = NULL;
	bridge->sysdata = NULL;
	bridge->busnr = 0;
	bridge->ops = &mcf_pci_ops;
	bridge->swizzle_irq = pci_common_swizzle;
	bridge->map_irq = mcf_pci_map_irq;

	ret = pci_scan_root_bus_bridge(bridge);
	if (ret) {
	pci_free_host_bridge(bridge);
	return ret;
	}

	rootbus = bridge->bus;

	rootbus->resource[0] = &mcf_pci_io;
	rootbus->resource[1] = &mcf_pci_mem;

	pci_bus_size_bridges(rootbus);
	pci_bus_assign_resources(rootbus);
	pci_bus_add_devices(rootbus);
	return 0;
	}

	subsys_initcall(mcf_pci_init);