225 lines
6.6 KiB
C
225 lines
6.6 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
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*/
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <asm/bootinfo.h>
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#include "pci-bcm63xx.h"
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/*
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* Allow PCI to be disabled at runtime depending on board nvram
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* configuration
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*/
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int bcm63xx_pci_enabled;
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static struct resource bcm_pci_mem_resource = {
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.name = "bcm63xx PCI memory space",
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.start = BCM_PCI_MEM_BASE_PA,
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.end = BCM_PCI_MEM_END_PA,
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.flags = IORESOURCE_MEM
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};
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static struct resource bcm_pci_io_resource = {
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.name = "bcm63xx PCI IO space",
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.start = BCM_PCI_IO_BASE_PA,
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#ifdef CONFIG_CARDBUS
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.end = BCM_PCI_IO_HALF_PA,
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#else
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.end = BCM_PCI_IO_END_PA,
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#endif
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.flags = IORESOURCE_IO
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};
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struct pci_controller bcm63xx_controller = {
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.pci_ops = &bcm63xx_pci_ops,
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.io_resource = &bcm_pci_io_resource,
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.mem_resource = &bcm_pci_mem_resource,
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};
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/*
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* We handle cardbus via a fake Cardbus bridge, memory and io spaces
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* have to be clearly separated from PCI one since we have different
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* memory decoder.
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*/
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#ifdef CONFIG_CARDBUS
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static struct resource bcm_cb_mem_resource = {
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.name = "bcm63xx Cardbus memory space",
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.start = BCM_CB_MEM_BASE_PA,
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.end = BCM_CB_MEM_END_PA,
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.flags = IORESOURCE_MEM
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};
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static struct resource bcm_cb_io_resource = {
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.name = "bcm63xx Cardbus IO space",
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.start = BCM_PCI_IO_HALF_PA + 1,
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.end = BCM_PCI_IO_END_PA,
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.flags = IORESOURCE_IO
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};
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struct pci_controller bcm63xx_cb_controller = {
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.pci_ops = &bcm63xx_cb_ops,
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.io_resource = &bcm_cb_io_resource,
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.mem_resource = &bcm_cb_mem_resource,
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};
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#endif
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static u32 bcm63xx_int_cfg_readl(u32 reg)
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{
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u32 tmp;
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tmp = reg & MPI_PCICFGCTL_CFGADDR_MASK;
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tmp |= MPI_PCICFGCTL_WRITEEN_MASK;
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bcm_mpi_writel(tmp, MPI_PCICFGCTL_REG);
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iob();
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return bcm_mpi_readl(MPI_PCICFGDATA_REG);
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}
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static void bcm63xx_int_cfg_writel(u32 val, u32 reg)
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{
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u32 tmp;
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tmp = reg & MPI_PCICFGCTL_CFGADDR_MASK;
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tmp |= MPI_PCICFGCTL_WRITEEN_MASK;
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bcm_mpi_writel(tmp, MPI_PCICFGCTL_REG);
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bcm_mpi_writel(val, MPI_PCICFGDATA_REG);
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}
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void __iomem *pci_iospace_start;
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static int __init bcm63xx_pci_init(void)
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{
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unsigned int mem_size;
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u32 val;
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if (!BCMCPU_IS_6348() && !BCMCPU_IS_6358())
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return -ENODEV;
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if (!bcm63xx_pci_enabled)
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return -ENODEV;
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/*
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* configuration access are done through IO space, remap 4
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* first bytes to access it from CPU.
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*
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* this means that no io access from CPU should happen while
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* we do a configuration cycle, but there's no way we can add
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* a spinlock for each io access, so this is currently kind of
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* broken on SMP.
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*/
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pci_iospace_start = ioremap_nocache(BCM_PCI_IO_BASE_PA, 4);
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if (!pci_iospace_start)
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return -ENOMEM;
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/* setup local bus to PCI access (PCI memory) */
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val = BCM_PCI_MEM_BASE_PA & MPI_L2P_BASE_MASK;
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bcm_mpi_writel(val, MPI_L2PMEMBASE1_REG);
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bcm_mpi_writel(~(BCM_PCI_MEM_SIZE - 1), MPI_L2PMEMRANGE1_REG);
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bcm_mpi_writel(val | MPI_L2PREMAP_ENABLED_MASK, MPI_L2PMEMREMAP1_REG);
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/* set Cardbus IDSEL (type 0 cfg access on primary bus for
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* this IDSEL will be done on Cardbus instead) */
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val = bcm_pcmcia_readl(PCMCIA_C1_REG);
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val &= ~PCMCIA_C1_CBIDSEL_MASK;
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val |= (CARDBUS_PCI_IDSEL << PCMCIA_C1_CBIDSEL_SHIFT);
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bcm_pcmcia_writel(val, PCMCIA_C1_REG);
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#ifdef CONFIG_CARDBUS
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/* setup local bus to PCI access (Cardbus memory) */
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val = BCM_CB_MEM_BASE_PA & MPI_L2P_BASE_MASK;
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bcm_mpi_writel(val, MPI_L2PMEMBASE2_REG);
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bcm_mpi_writel(~(BCM_CB_MEM_SIZE - 1), MPI_L2PMEMRANGE2_REG);
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val |= MPI_L2PREMAP_ENABLED_MASK | MPI_L2PREMAP_IS_CARDBUS_MASK;
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bcm_mpi_writel(val, MPI_L2PMEMREMAP2_REG);
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#else
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/* disable second access windows */
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bcm_mpi_writel(0, MPI_L2PMEMREMAP2_REG);
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#endif
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/* setup local bus to PCI access (IO memory), we have only 1
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* IO window for both PCI and cardbus, but it cannot handle
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* both at the same time, assume standard PCI for now, if
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* cardbus card has IO zone, PCI fixup will change window to
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* cardbus */
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val = BCM_PCI_IO_BASE_PA & MPI_L2P_BASE_MASK;
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bcm_mpi_writel(val, MPI_L2PIOBASE_REG);
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bcm_mpi_writel(~(BCM_PCI_IO_SIZE - 1), MPI_L2PIORANGE_REG);
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bcm_mpi_writel(val | MPI_L2PREMAP_ENABLED_MASK, MPI_L2PIOREMAP_REG);
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/* enable PCI related GPIO pins */
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bcm_mpi_writel(MPI_LOCBUSCTL_EN_PCI_GPIO_MASK, MPI_LOCBUSCTL_REG);
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/* setup PCI to local bus access, used by PCI device to target
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* local RAM while bus mastering */
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bcm63xx_int_cfg_writel(0, PCI_BASE_ADDRESS_3);
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if (BCMCPU_IS_6358())
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val = MPI_SP0_REMAP_ENABLE_MASK;
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else
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val = 0;
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bcm_mpi_writel(val, MPI_SP0_REMAP_REG);
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bcm63xx_int_cfg_writel(0x0, PCI_BASE_ADDRESS_4);
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bcm_mpi_writel(0, MPI_SP1_REMAP_REG);
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mem_size = bcm63xx_get_memory_size();
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/* 6348 before rev b0 exposes only 16 MB of RAM memory through
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* PCI, throw a warning if we have more memory */
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if (BCMCPU_IS_6348() && (bcm63xx_get_cpu_rev() & 0xf0) == 0xa0) {
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if (mem_size > (16 * 1024 * 1024))
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printk(KERN_WARNING "bcm63xx: this CPU "
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"revision cannot handle more than 16MB "
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"of RAM for PCI bus mastering\n");
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} else {
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/* setup sp0 range to local RAM size */
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bcm_mpi_writel(~(mem_size - 1), MPI_SP0_RANGE_REG);
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bcm_mpi_writel(0, MPI_SP1_RANGE_REG);
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}
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/* change host bridge retry counter to infinite number of
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* retry, needed for some broadcom wifi cards with Silicon
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* Backplane bus where access to srom seems very slow */
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val = bcm63xx_int_cfg_readl(BCMPCI_REG_TIMERS);
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val &= ~REG_TIMER_RETRY_MASK;
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bcm63xx_int_cfg_writel(val, BCMPCI_REG_TIMERS);
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/* enable memory decoder and bus mastering */
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val = bcm63xx_int_cfg_readl(PCI_COMMAND);
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val |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
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bcm63xx_int_cfg_writel(val, PCI_COMMAND);
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/* enable read prefetching & disable byte swapping for bus
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* mastering transfers */
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val = bcm_mpi_readl(MPI_PCIMODESEL_REG);
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val &= ~MPI_PCIMODESEL_BAR1_NOSWAP_MASK;
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val &= ~MPI_PCIMODESEL_BAR2_NOSWAP_MASK;
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val &= ~MPI_PCIMODESEL_PREFETCH_MASK;
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val |= (8 << MPI_PCIMODESEL_PREFETCH_SHIFT);
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bcm_mpi_writel(val, MPI_PCIMODESEL_REG);
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/* enable pci interrupt */
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val = bcm_mpi_readl(MPI_LOCINT_REG);
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val |= MPI_LOCINT_MASK(MPI_LOCINT_EXT_PCI_INT);
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bcm_mpi_writel(val, MPI_LOCINT_REG);
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register_pci_controller(&bcm63xx_controller);
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#ifdef CONFIG_CARDBUS
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register_pci_controller(&bcm63xx_cb_controller);
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#endif
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/* mark memory space used for IO mapping as reserved */
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request_mem_region(BCM_PCI_IO_BASE_PA, BCM_PCI_IO_SIZE,
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"bcm63xx PCI IO space");
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return 0;
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}
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arch_initcall(bcm63xx_pci_init);
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