605 lines
15 KiB
C
605 lines
15 KiB
C
/*
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* arch/arm/mach-orion5x/pci.c
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*
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* PCI and PCIe functions for Marvell Orion System On Chip
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*
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* Maintainer: Tzachi Perelstein <tzachi@marvell.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/mbus.h>
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#include <video/vga.h>
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#include <asm/irq.h>
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#include <asm/mach/pci.h>
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#include <plat/pcie.h>
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#include "common.h"
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/*****************************************************************************
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* Orion has one PCIe controller and one PCI controller.
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*
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* Note1: The local PCIe bus number is '0'. The local PCI bus number
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* follows the scanned PCIe bridged busses, if any.
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*
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* Note2: It is possible for PCI/PCIe agents to access many subsystem's
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* space, by configuring BARs and Address Decode Windows, e.g. flashes on
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* device bus, Orion registers, etc. However this code only enable the
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* access to DDR banks.
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****************************************************************************/
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/*****************************************************************************
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* PCIe controller
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****************************************************************************/
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#define PCIE_BASE ((void __iomem *)ORION5X_PCIE_VIRT_BASE)
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void __init orion5x_pcie_id(u32 *dev, u32 *rev)
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{
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*dev = orion_pcie_dev_id(PCIE_BASE);
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*rev = orion_pcie_rev(PCIE_BASE);
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}
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static int pcie_valid_config(int bus, int dev)
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{
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/*
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* Don't go out when trying to access --
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* 1. nonexisting device on local bus
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* 2. where there's no device connected (no link)
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*/
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if (bus == 0 && dev == 0)
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return 1;
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if (!orion_pcie_link_up(PCIE_BASE))
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return 0;
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if (bus == 0 && dev != 1)
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return 0;
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return 1;
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}
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/*
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* PCIe config cycles are done by programming the PCIE_CONF_ADDR register
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* and then reading the PCIE_CONF_DATA register. Need to make sure these
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* transactions are atomic.
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*/
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static DEFINE_SPINLOCK(orion5x_pcie_lock);
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static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
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int size, u32 *val)
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{
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unsigned long flags;
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int ret;
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if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
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*val = 0xffffffff;
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return PCIBIOS_DEVICE_NOT_FOUND;
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}
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spin_lock_irqsave(&orion5x_pcie_lock, flags);
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ret = orion_pcie_rd_conf(PCIE_BASE, bus, devfn, where, size, val);
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spin_unlock_irqrestore(&orion5x_pcie_lock, flags);
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return ret;
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}
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static int pcie_rd_conf_wa(struct pci_bus *bus, u32 devfn,
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int where, int size, u32 *val)
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{
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int ret;
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if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
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*val = 0xffffffff;
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return PCIBIOS_DEVICE_NOT_FOUND;
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}
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/*
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* We only support access to the non-extended configuration
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* space when using the WA access method (or we would have to
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* sacrifice 256M of CPU virtual address space.)
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*/
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if (where >= 0x100) {
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*val = 0xffffffff;
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return PCIBIOS_DEVICE_NOT_FOUND;
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}
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ret = orion_pcie_rd_conf_wa((void __iomem *)ORION5X_PCIE_WA_VIRT_BASE,
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bus, devfn, where, size, val);
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return ret;
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}
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static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
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int where, int size, u32 val)
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{
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unsigned long flags;
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int ret;
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if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0)
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return PCIBIOS_DEVICE_NOT_FOUND;
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spin_lock_irqsave(&orion5x_pcie_lock, flags);
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ret = orion_pcie_wr_conf(PCIE_BASE, bus, devfn, where, size, val);
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spin_unlock_irqrestore(&orion5x_pcie_lock, flags);
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return ret;
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}
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static struct pci_ops pcie_ops = {
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.read = pcie_rd_conf,
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.write = pcie_wr_conf,
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};
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static int __init pcie_setup(struct pci_sys_data *sys)
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{
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struct resource *res;
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int dev;
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/*
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* Generic PCIe unit setup.
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*/
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orion_pcie_setup(PCIE_BASE, &orion5x_mbus_dram_info);
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/*
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* Check whether to apply Orion-1/Orion-NAS PCIe config
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* read transaction workaround.
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*/
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dev = orion_pcie_dev_id(PCIE_BASE);
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if (dev == MV88F5181_DEV_ID || dev == MV88F5182_DEV_ID) {
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printk(KERN_NOTICE "Applying Orion-1/Orion-NAS PCIe config "
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"read transaction workaround\n");
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orion5x_setup_pcie_wa_win(ORION5X_PCIE_WA_PHYS_BASE,
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ORION5X_PCIE_WA_SIZE);
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pcie_ops.read = pcie_rd_conf_wa;
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}
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/*
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* Request resources.
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*/
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res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
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if (!res)
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panic("pcie_setup unable to alloc resources");
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/*
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* IORESOURCE_IO
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*/
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res[0].name = "PCIe I/O Space";
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res[0].flags = IORESOURCE_IO;
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res[0].start = ORION5X_PCIE_IO_BUS_BASE;
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res[0].end = res[0].start + ORION5X_PCIE_IO_SIZE - 1;
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if (request_resource(&ioport_resource, &res[0]))
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panic("Request PCIe IO resource failed\n");
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sys->resource[0] = &res[0];
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/*
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* IORESOURCE_MEM
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*/
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res[1].name = "PCIe Memory Space";
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res[1].flags = IORESOURCE_MEM;
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res[1].start = ORION5X_PCIE_MEM_PHYS_BASE;
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res[1].end = res[1].start + ORION5X_PCIE_MEM_SIZE - 1;
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if (request_resource(&iomem_resource, &res[1]))
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panic("Request PCIe Memory resource failed\n");
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sys->resource[1] = &res[1];
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sys->resource[2] = NULL;
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sys->io_offset = 0;
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return 1;
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}
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/*****************************************************************************
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* PCI controller
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****************************************************************************/
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#define ORION5X_PCI_REG(x) (ORION5X_PCI_VIRT_BASE | (x))
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#define PCI_MODE ORION5X_PCI_REG(0xd00)
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#define PCI_CMD ORION5X_PCI_REG(0xc00)
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#define PCI_P2P_CONF ORION5X_PCI_REG(0x1d14)
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#define PCI_CONF_ADDR ORION5X_PCI_REG(0xc78)
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#define PCI_CONF_DATA ORION5X_PCI_REG(0xc7c)
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/*
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* PCI_MODE bits
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*/
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#define PCI_MODE_64BIT (1 << 2)
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#define PCI_MODE_PCIX ((1 << 4) | (1 << 5))
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/*
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* PCI_CMD bits
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*/
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#define PCI_CMD_HOST_REORDER (1 << 29)
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/*
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* PCI_P2P_CONF bits
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*/
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#define PCI_P2P_BUS_OFFS 16
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#define PCI_P2P_BUS_MASK (0xff << PCI_P2P_BUS_OFFS)
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#define PCI_P2P_DEV_OFFS 24
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#define PCI_P2P_DEV_MASK (0x1f << PCI_P2P_DEV_OFFS)
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/*
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* PCI_CONF_ADDR bits
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*/
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#define PCI_CONF_REG(reg) ((reg) & 0xfc)
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#define PCI_CONF_FUNC(func) (((func) & 0x3) << 8)
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#define PCI_CONF_DEV(dev) (((dev) & 0x1f) << 11)
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#define PCI_CONF_BUS(bus) (((bus) & 0xff) << 16)
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#define PCI_CONF_ADDR_EN (1 << 31)
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/*
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* Internal configuration space
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*/
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#define PCI_CONF_FUNC_STAT_CMD 0
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#define PCI_CONF_REG_STAT_CMD 4
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#define PCIX_STAT 0x64
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#define PCIX_STAT_BUS_OFFS 8
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#define PCIX_STAT_BUS_MASK (0xff << PCIX_STAT_BUS_OFFS)
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/*
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* PCI Address Decode Windows registers
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*/
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#define PCI_BAR_SIZE_DDR_CS(n) (((n) == 0) ? ORION5X_PCI_REG(0xc08) : \
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((n) == 1) ? ORION5X_PCI_REG(0xd08) : \
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((n) == 2) ? ORION5X_PCI_REG(0xc0c) : \
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((n) == 3) ? ORION5X_PCI_REG(0xd0c) : 0)
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#define PCI_BAR_REMAP_DDR_CS(n) (((n) == 0) ? ORION5X_PCI_REG(0xc48) : \
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((n) == 1) ? ORION5X_PCI_REG(0xd48) : \
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((n) == 2) ? ORION5X_PCI_REG(0xc4c) : \
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((n) == 3) ? ORION5X_PCI_REG(0xd4c) : 0)
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#define PCI_BAR_ENABLE ORION5X_PCI_REG(0xc3c)
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#define PCI_ADDR_DECODE_CTRL ORION5X_PCI_REG(0xd3c)
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/*
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* PCI configuration helpers for BAR settings
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*/
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#define PCI_CONF_FUNC_BAR_CS(n) ((n) >> 1)
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#define PCI_CONF_REG_BAR_LO_CS(n) (((n) & 1) ? 0x18 : 0x10)
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#define PCI_CONF_REG_BAR_HI_CS(n) (((n) & 1) ? 0x1c : 0x14)
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/*
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* PCI config cycles are done by programming the PCI_CONF_ADDR register
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* and then reading the PCI_CONF_DATA register. Need to make sure these
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* transactions are atomic.
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*/
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static DEFINE_SPINLOCK(orion5x_pci_lock);
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static int orion5x_pci_cardbus_mode;
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static int orion5x_pci_local_bus_nr(void)
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{
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u32 conf = readl(PCI_P2P_CONF);
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return((conf & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS);
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}
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static int orion5x_pci_hw_rd_conf(int bus, int dev, u32 func,
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u32 where, u32 size, u32 *val)
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{
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unsigned long flags;
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spin_lock_irqsave(&orion5x_pci_lock, flags);
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writel(PCI_CONF_BUS(bus) |
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PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
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PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR);
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*val = readl(PCI_CONF_DATA);
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if (size == 1)
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*val = (*val >> (8*(where & 0x3))) & 0xff;
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else if (size == 2)
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*val = (*val >> (8*(where & 0x3))) & 0xffff;
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spin_unlock_irqrestore(&orion5x_pci_lock, flags);
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return PCIBIOS_SUCCESSFUL;
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}
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static int orion5x_pci_hw_wr_conf(int bus, int dev, u32 func,
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u32 where, u32 size, u32 val)
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{
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unsigned long flags;
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int ret = PCIBIOS_SUCCESSFUL;
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spin_lock_irqsave(&orion5x_pci_lock, flags);
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writel(PCI_CONF_BUS(bus) |
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PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
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PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR);
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if (size == 4) {
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__raw_writel(val, PCI_CONF_DATA);
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} else if (size == 2) {
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__raw_writew(val, PCI_CONF_DATA + (where & 0x3));
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} else if (size == 1) {
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__raw_writeb(val, PCI_CONF_DATA + (where & 0x3));
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} else {
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ret = PCIBIOS_BAD_REGISTER_NUMBER;
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}
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spin_unlock_irqrestore(&orion5x_pci_lock, flags);
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return ret;
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}
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static int orion5x_pci_valid_config(int bus, u32 devfn)
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{
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if (bus == orion5x_pci_local_bus_nr()) {
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/*
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* Don't go out for local device
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*/
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if (PCI_SLOT(devfn) == 0 && PCI_FUNC(devfn) != 0)
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return 0;
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/*
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* When the PCI signals are directly connected to a
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* Cardbus slot, ignore all but device IDs 0 and 1.
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*/
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if (orion5x_pci_cardbus_mode && PCI_SLOT(devfn) > 1)
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return 0;
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}
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return 1;
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}
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static int orion5x_pci_rd_conf(struct pci_bus *bus, u32 devfn,
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int where, int size, u32 *val)
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{
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if (!orion5x_pci_valid_config(bus->number, devfn)) {
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*val = 0xffffffff;
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return PCIBIOS_DEVICE_NOT_FOUND;
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}
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return orion5x_pci_hw_rd_conf(bus->number, PCI_SLOT(devfn),
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PCI_FUNC(devfn), where, size, val);
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}
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static int orion5x_pci_wr_conf(struct pci_bus *bus, u32 devfn,
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int where, int size, u32 val)
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{
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if (!orion5x_pci_valid_config(bus->number, devfn))
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return PCIBIOS_DEVICE_NOT_FOUND;
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return orion5x_pci_hw_wr_conf(bus->number, PCI_SLOT(devfn),
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PCI_FUNC(devfn), where, size, val);
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}
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static struct pci_ops pci_ops = {
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.read = orion5x_pci_rd_conf,
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.write = orion5x_pci_wr_conf,
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};
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static void __init orion5x_pci_set_bus_nr(int nr)
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{
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u32 p2p = readl(PCI_P2P_CONF);
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if (readl(PCI_MODE) & PCI_MODE_PCIX) {
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/*
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* PCI-X mode
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*/
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u32 pcix_status, bus, dev;
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bus = (p2p & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS;
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dev = (p2p & PCI_P2P_DEV_MASK) >> PCI_P2P_DEV_OFFS;
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orion5x_pci_hw_rd_conf(bus, dev, 0, PCIX_STAT, 4, &pcix_status);
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pcix_status &= ~PCIX_STAT_BUS_MASK;
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pcix_status |= (nr << PCIX_STAT_BUS_OFFS);
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orion5x_pci_hw_wr_conf(bus, dev, 0, PCIX_STAT, 4, pcix_status);
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} else {
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/*
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* PCI Conventional mode
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*/
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p2p &= ~PCI_P2P_BUS_MASK;
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p2p |= (nr << PCI_P2P_BUS_OFFS);
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writel(p2p, PCI_P2P_CONF);
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}
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}
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static void __init orion5x_pci_master_slave_enable(void)
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{
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int bus_nr, func, reg;
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u32 val;
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bus_nr = orion5x_pci_local_bus_nr();
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func = PCI_CONF_FUNC_STAT_CMD;
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reg = PCI_CONF_REG_STAT_CMD;
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orion5x_pci_hw_rd_conf(bus_nr, 0, func, reg, 4, &val);
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val |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
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orion5x_pci_hw_wr_conf(bus_nr, 0, func, reg, 4, val | 0x7);
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}
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static void __init orion5x_setup_pci_wins(struct mbus_dram_target_info *dram)
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{
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u32 win_enable;
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int bus;
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int i;
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/*
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* First, disable windows.
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*/
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win_enable = 0xffffffff;
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writel(win_enable, PCI_BAR_ENABLE);
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/*
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* Setup windows for DDR banks.
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*/
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bus = orion5x_pci_local_bus_nr();
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for (i = 0; i < dram->num_cs; i++) {
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struct mbus_dram_window *cs = dram->cs + i;
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u32 func = PCI_CONF_FUNC_BAR_CS(cs->cs_index);
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u32 reg;
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u32 val;
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/*
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* Write DRAM bank base address register.
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*/
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reg = PCI_CONF_REG_BAR_LO_CS(cs->cs_index);
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orion5x_pci_hw_rd_conf(bus, 0, func, reg, 4, &val);
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val = (cs->base & 0xfffff000) | (val & 0xfff);
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orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, val);
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/*
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* Write DRAM bank size register.
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*/
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reg = PCI_CONF_REG_BAR_HI_CS(cs->cs_index);
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orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, 0);
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writel((cs->size - 1) & 0xfffff000,
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PCI_BAR_SIZE_DDR_CS(cs->cs_index));
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writel(cs->base & 0xfffff000,
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PCI_BAR_REMAP_DDR_CS(cs->cs_index));
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/*
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* Enable decode window for this chip select.
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*/
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win_enable &= ~(1 << cs->cs_index);
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}
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/*
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* Re-enable decode windows.
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*/
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writel(win_enable, PCI_BAR_ENABLE);
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/*
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* Disable automatic update of address remapping when writing to BARs.
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*/
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orion5x_setbits(PCI_ADDR_DECODE_CTRL, 1);
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}
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static int __init pci_setup(struct pci_sys_data *sys)
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{
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struct resource *res;
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/*
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* Point PCI unit MBUS decode windows to DRAM space.
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*/
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orion5x_setup_pci_wins(&orion5x_mbus_dram_info);
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/*
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* Master + Slave enable
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*/
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orion5x_pci_master_slave_enable();
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/*
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* Force ordering
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*/
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orion5x_setbits(PCI_CMD, PCI_CMD_HOST_REORDER);
|
|
|
|
/*
|
|
* Request resources
|
|
*/
|
|
res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
|
|
if (!res)
|
|
panic("pci_setup unable to alloc resources");
|
|
|
|
/*
|
|
* IORESOURCE_IO
|
|
*/
|
|
res[0].name = "PCI I/O Space";
|
|
res[0].flags = IORESOURCE_IO;
|
|
res[0].start = ORION5X_PCI_IO_BUS_BASE;
|
|
res[0].end = res[0].start + ORION5X_PCI_IO_SIZE - 1;
|
|
if (request_resource(&ioport_resource, &res[0]))
|
|
panic("Request PCI IO resource failed\n");
|
|
sys->resource[0] = &res[0];
|
|
|
|
/*
|
|
* IORESOURCE_MEM
|
|
*/
|
|
res[1].name = "PCI Memory Space";
|
|
res[1].flags = IORESOURCE_MEM;
|
|
res[1].start = ORION5X_PCI_MEM_PHYS_BASE;
|
|
res[1].end = res[1].start + ORION5X_PCI_MEM_SIZE - 1;
|
|
if (request_resource(&iomem_resource, &res[1]))
|
|
panic("Request PCI Memory resource failed\n");
|
|
sys->resource[1] = &res[1];
|
|
|
|
sys->resource[2] = NULL;
|
|
sys->io_offset = 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* General PCIe + PCI
|
|
****************************************************************************/
|
|
static void __devinit rc_pci_fixup(struct pci_dev *dev)
|
|
{
|
|
/*
|
|
* Prevent enumeration of root complex.
|
|
*/
|
|
if (dev->bus->parent == NULL && dev->devfn == 0) {
|
|
int i;
|
|
|
|
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
|
|
dev->resource[i].start = 0;
|
|
dev->resource[i].end = 0;
|
|
dev->resource[i].flags = 0;
|
|
}
|
|
}
|
|
}
|
|
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
|
|
|
|
static int orion5x_pci_disabled __initdata;
|
|
|
|
void __init orion5x_pci_disable(void)
|
|
{
|
|
orion5x_pci_disabled = 1;
|
|
}
|
|
|
|
void __init orion5x_pci_set_cardbus_mode(void)
|
|
{
|
|
orion5x_pci_cardbus_mode = 1;
|
|
}
|
|
|
|
int __init orion5x_pci_sys_setup(int nr, struct pci_sys_data *sys)
|
|
{
|
|
int ret = 0;
|
|
|
|
vga_base = ORION5X_PCIE_MEM_PHYS_BASE;
|
|
|
|
if (nr == 0) {
|
|
orion_pcie_set_local_bus_nr(PCIE_BASE, sys->busnr);
|
|
ret = pcie_setup(sys);
|
|
} else if (nr == 1 && !orion5x_pci_disabled) {
|
|
orion5x_pci_set_bus_nr(sys->busnr);
|
|
ret = pci_setup(sys);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct pci_bus __init *orion5x_pci_sys_scan_bus(int nr, struct pci_sys_data *sys)
|
|
{
|
|
struct pci_bus *bus;
|
|
|
|
if (nr == 0) {
|
|
bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
|
|
} else if (nr == 1 && !orion5x_pci_disabled) {
|
|
bus = pci_scan_bus(sys->busnr, &pci_ops, sys);
|
|
} else {
|
|
bus = NULL;
|
|
BUG();
|
|
}
|
|
|
|
return bus;
|
|
}
|
|
|
|
int __init orion5x_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
|
|
{
|
|
int bus = dev->bus->number;
|
|
|
|
/*
|
|
* PCIe endpoint?
|
|
*/
|
|
if (orion5x_pci_disabled || bus < orion5x_pci_local_bus_nr())
|
|
return IRQ_ORION5X_PCIE0_INT;
|
|
|
|
return -1;
|
|
}
|