352 lines
9.6 KiB
C
352 lines
9.6 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/clk.h>
|
|
#include <asm/bootinfo.h>
|
|
|
|
#include <bcm63xx_reset.h>
|
|
|
|
#include "pci-bcm63xx.h"
|
|
|
|
/*
|
|
* Allow PCI to be disabled at runtime depending on board nvram
|
|
* configuration
|
|
*/
|
|
int bcm63xx_pci_enabled;
|
|
|
|
static struct resource bcm_pci_mem_resource = {
|
|
.name = "bcm63xx PCI memory space",
|
|
.start = BCM_PCI_MEM_BASE_PA,
|
|
.end = BCM_PCI_MEM_END_PA,
|
|
.flags = IORESOURCE_MEM
|
|
};
|
|
|
|
static struct resource bcm_pci_io_resource = {
|
|
.name = "bcm63xx PCI IO space",
|
|
.start = BCM_PCI_IO_BASE_PA,
|
|
#ifdef CONFIG_CARDBUS
|
|
.end = BCM_PCI_IO_HALF_PA,
|
|
#else
|
|
.end = BCM_PCI_IO_END_PA,
|
|
#endif
|
|
.flags = IORESOURCE_IO
|
|
};
|
|
|
|
struct pci_controller bcm63xx_controller = {
|
|
.pci_ops = &bcm63xx_pci_ops,
|
|
.io_resource = &bcm_pci_io_resource,
|
|
.mem_resource = &bcm_pci_mem_resource,
|
|
};
|
|
|
|
/*
|
|
* We handle cardbus via a fake Cardbus bridge, memory and io spaces
|
|
* have to be clearly separated from PCI one since we have different
|
|
* memory decoder.
|
|
*/
|
|
#ifdef CONFIG_CARDBUS
|
|
static struct resource bcm_cb_mem_resource = {
|
|
.name = "bcm63xx Cardbus memory space",
|
|
.start = BCM_CB_MEM_BASE_PA,
|
|
.end = BCM_CB_MEM_END_PA,
|
|
.flags = IORESOURCE_MEM
|
|
};
|
|
|
|
static struct resource bcm_cb_io_resource = {
|
|
.name = "bcm63xx Cardbus IO space",
|
|
.start = BCM_PCI_IO_HALF_PA + 1,
|
|
.end = BCM_PCI_IO_END_PA,
|
|
.flags = IORESOURCE_IO
|
|
};
|
|
|
|
struct pci_controller bcm63xx_cb_controller = {
|
|
.pci_ops = &bcm63xx_cb_ops,
|
|
.io_resource = &bcm_cb_io_resource,
|
|
.mem_resource = &bcm_cb_mem_resource,
|
|
};
|
|
#endif
|
|
|
|
static struct resource bcm_pcie_mem_resource = {
|
|
.name = "bcm63xx PCIe memory space",
|
|
.start = BCM_PCIE_MEM_BASE_PA,
|
|
.end = BCM_PCIE_MEM_END_PA,
|
|
.flags = IORESOURCE_MEM,
|
|
};
|
|
|
|
static struct resource bcm_pcie_io_resource = {
|
|
.name = "bcm63xx PCIe IO space",
|
|
.start = 0,
|
|
.end = 0,
|
|
.flags = 0,
|
|
};
|
|
|
|
struct pci_controller bcm63xx_pcie_controller = {
|
|
.pci_ops = &bcm63xx_pcie_ops,
|
|
.io_resource = &bcm_pcie_io_resource,
|
|
.mem_resource = &bcm_pcie_mem_resource,
|
|
};
|
|
|
|
static u32 bcm63xx_int_cfg_readl(u32 reg)
|
|
{
|
|
u32 tmp;
|
|
|
|
tmp = reg & MPI_PCICFGCTL_CFGADDR_MASK;
|
|
tmp |= MPI_PCICFGCTL_WRITEEN_MASK;
|
|
bcm_mpi_writel(tmp, MPI_PCICFGCTL_REG);
|
|
iob();
|
|
return bcm_mpi_readl(MPI_PCICFGDATA_REG);
|
|
}
|
|
|
|
static void bcm63xx_int_cfg_writel(u32 val, u32 reg)
|
|
{
|
|
u32 tmp;
|
|
|
|
tmp = reg & MPI_PCICFGCTL_CFGADDR_MASK;
|
|
tmp |= MPI_PCICFGCTL_WRITEEN_MASK;
|
|
bcm_mpi_writel(tmp, MPI_PCICFGCTL_REG);
|
|
bcm_mpi_writel(val, MPI_PCICFGDATA_REG);
|
|
}
|
|
|
|
void __iomem *pci_iospace_start;
|
|
|
|
static void __init bcm63xx_reset_pcie(void)
|
|
{
|
|
u32 val;
|
|
u32 reg;
|
|
|
|
/* enable SERDES */
|
|
if (BCMCPU_IS_6328())
|
|
reg = MISC_SERDES_CTRL_6328_REG;
|
|
else
|
|
reg = MISC_SERDES_CTRL_6362_REG;
|
|
|
|
val = bcm_misc_readl(reg);
|
|
val |= SERDES_PCIE_EN | SERDES_PCIE_EXD_EN;
|
|
bcm_misc_writel(val, reg);
|
|
|
|
/* reset the PCIe core */
|
|
bcm63xx_core_set_reset(BCM63XX_RESET_PCIE, 1);
|
|
bcm63xx_core_set_reset(BCM63XX_RESET_PCIE_EXT, 1);
|
|
mdelay(10);
|
|
|
|
bcm63xx_core_set_reset(BCM63XX_RESET_PCIE, 0);
|
|
mdelay(10);
|
|
|
|
bcm63xx_core_set_reset(BCM63XX_RESET_PCIE_EXT, 0);
|
|
mdelay(200);
|
|
}
|
|
|
|
static struct clk *pcie_clk;
|
|
|
|
static int __init bcm63xx_register_pcie(void)
|
|
{
|
|
u32 val;
|
|
|
|
/* enable clock */
|
|
pcie_clk = clk_get(NULL, "pcie");
|
|
if (IS_ERR_OR_NULL(pcie_clk))
|
|
return -ENODEV;
|
|
|
|
clk_prepare_enable(pcie_clk);
|
|
|
|
bcm63xx_reset_pcie();
|
|
|
|
/* configure the PCIe bridge */
|
|
val = bcm_pcie_readl(PCIE_BRIDGE_OPT1_REG);
|
|
val |= OPT1_RD_BE_OPT_EN;
|
|
val |= OPT1_RD_REPLY_BE_FIX_EN;
|
|
val |= OPT1_PCIE_BRIDGE_HOLE_DET_EN;
|
|
val |= OPT1_L1_INT_STATUS_MASK_POL;
|
|
bcm_pcie_writel(val, PCIE_BRIDGE_OPT1_REG);
|
|
|
|
/* setup the interrupts */
|
|
val = bcm_pcie_readl(PCIE_BRIDGE_RC_INT_MASK_REG);
|
|
val |= PCIE_RC_INT_A | PCIE_RC_INT_B | PCIE_RC_INT_C | PCIE_RC_INT_D;
|
|
bcm_pcie_writel(val, PCIE_BRIDGE_RC_INT_MASK_REG);
|
|
|
|
val = bcm_pcie_readl(PCIE_BRIDGE_OPT2_REG);
|
|
/* enable credit checking and error checking */
|
|
val |= OPT2_TX_CREDIT_CHK_EN;
|
|
val |= OPT2_UBUS_UR_DECODE_DIS;
|
|
|
|
/* set device bus/func for the pcie device */
|
|
val |= (PCIE_BUS_DEVICE << OPT2_CFG_TYPE1_BUS_NO_SHIFT);
|
|
val |= OPT2_CFG_TYPE1_BD_SEL;
|
|
bcm_pcie_writel(val, PCIE_BRIDGE_OPT2_REG);
|
|
|
|
/* setup class code as bridge */
|
|
val = bcm_pcie_readl(PCIE_IDVAL3_REG);
|
|
val &= ~IDVAL3_CLASS_CODE_MASK;
|
|
val |= PCI_CLASS_BRIDGE_PCI_NORMAL;
|
|
bcm_pcie_writel(val, PCIE_IDVAL3_REG);
|
|
|
|
/* disable bar1 size */
|
|
val = bcm_pcie_readl(PCIE_CONFIG2_REG);
|
|
val &= ~CONFIG2_BAR1_SIZE_MASK;
|
|
bcm_pcie_writel(val, PCIE_CONFIG2_REG);
|
|
|
|
/* set bar0 to little endian */
|
|
val = (BCM_PCIE_MEM_BASE_PA >> 20) << BASEMASK_BASE_SHIFT;
|
|
val |= (BCM_PCIE_MEM_BASE_PA >> 20) << BASEMASK_MASK_SHIFT;
|
|
val |= BASEMASK_REMAP_EN;
|
|
bcm_pcie_writel(val, PCIE_BRIDGE_BAR0_BASEMASK_REG);
|
|
|
|
val = (BCM_PCIE_MEM_BASE_PA >> 20) << REBASE_ADDR_BASE_SHIFT;
|
|
bcm_pcie_writel(val, PCIE_BRIDGE_BAR0_REBASE_ADDR_REG);
|
|
|
|
register_pci_controller(&bcm63xx_pcie_controller);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init bcm63xx_register_pci(void)
|
|
{
|
|
unsigned int mem_size;
|
|
u32 val;
|
|
/*
|
|
* configuration access are done through IO space, remap 4
|
|
* first bytes to access it from CPU.
|
|
*
|
|
* this means that no io access from CPU should happen while
|
|
* we do a configuration cycle, but there's no way we can add
|
|
* a spinlock for each io access, so this is currently kind of
|
|
* broken on SMP.
|
|
*/
|
|
pci_iospace_start = ioremap(BCM_PCI_IO_BASE_PA, 4);
|
|
if (!pci_iospace_start)
|
|
return -ENOMEM;
|
|
|
|
/* setup local bus to PCI access (PCI memory) */
|
|
val = BCM_PCI_MEM_BASE_PA & MPI_L2P_BASE_MASK;
|
|
bcm_mpi_writel(val, MPI_L2PMEMBASE1_REG);
|
|
bcm_mpi_writel(~(BCM_PCI_MEM_SIZE - 1), MPI_L2PMEMRANGE1_REG);
|
|
bcm_mpi_writel(val | MPI_L2PREMAP_ENABLED_MASK, MPI_L2PMEMREMAP1_REG);
|
|
|
|
/* set Cardbus IDSEL (type 0 cfg access on primary bus for
|
|
* this IDSEL will be done on Cardbus instead) */
|
|
val = bcm_pcmcia_readl(PCMCIA_C1_REG);
|
|
val &= ~PCMCIA_C1_CBIDSEL_MASK;
|
|
val |= (CARDBUS_PCI_IDSEL << PCMCIA_C1_CBIDSEL_SHIFT);
|
|
bcm_pcmcia_writel(val, PCMCIA_C1_REG);
|
|
|
|
#ifdef CONFIG_CARDBUS
|
|
/* setup local bus to PCI access (Cardbus memory) */
|
|
val = BCM_CB_MEM_BASE_PA & MPI_L2P_BASE_MASK;
|
|
bcm_mpi_writel(val, MPI_L2PMEMBASE2_REG);
|
|
bcm_mpi_writel(~(BCM_CB_MEM_SIZE - 1), MPI_L2PMEMRANGE2_REG);
|
|
val |= MPI_L2PREMAP_ENABLED_MASK | MPI_L2PREMAP_IS_CARDBUS_MASK;
|
|
bcm_mpi_writel(val, MPI_L2PMEMREMAP2_REG);
|
|
#else
|
|
/* disable second access windows */
|
|
bcm_mpi_writel(0, MPI_L2PMEMREMAP2_REG);
|
|
#endif
|
|
|
|
/* setup local bus to PCI access (IO memory), we have only 1
|
|
* IO window for both PCI and cardbus, but it cannot handle
|
|
* both at the same time, assume standard PCI for now, if
|
|
* cardbus card has IO zone, PCI fixup will change window to
|
|
* cardbus */
|
|
val = BCM_PCI_IO_BASE_PA & MPI_L2P_BASE_MASK;
|
|
bcm_mpi_writel(val, MPI_L2PIOBASE_REG);
|
|
bcm_mpi_writel(~(BCM_PCI_IO_SIZE - 1), MPI_L2PIORANGE_REG);
|
|
bcm_mpi_writel(val | MPI_L2PREMAP_ENABLED_MASK, MPI_L2PIOREMAP_REG);
|
|
|
|
/* enable PCI related GPIO pins */
|
|
bcm_mpi_writel(MPI_LOCBUSCTL_EN_PCI_GPIO_MASK, MPI_LOCBUSCTL_REG);
|
|
|
|
/* setup PCI to local bus access, used by PCI device to target
|
|
* local RAM while bus mastering */
|
|
bcm63xx_int_cfg_writel(0, PCI_BASE_ADDRESS_3);
|
|
if (BCMCPU_IS_3368() || BCMCPU_IS_6358() || BCMCPU_IS_6368())
|
|
val = MPI_SP0_REMAP_ENABLE_MASK;
|
|
else
|
|
val = 0;
|
|
bcm_mpi_writel(val, MPI_SP0_REMAP_REG);
|
|
|
|
bcm63xx_int_cfg_writel(0x0, PCI_BASE_ADDRESS_4);
|
|
bcm_mpi_writel(0, MPI_SP1_REMAP_REG);
|
|
|
|
mem_size = bcm63xx_get_memory_size();
|
|
|
|
/* 6348 before rev b0 exposes only 16 MB of RAM memory through
|
|
* PCI, throw a warning if we have more memory */
|
|
if (BCMCPU_IS_6348() && (bcm63xx_get_cpu_rev() & 0xf0) == 0xa0) {
|
|
if (mem_size > (16 * 1024 * 1024))
|
|
printk(KERN_WARNING "bcm63xx: this CPU "
|
|
"revision cannot handle more than 16MB "
|
|
"of RAM for PCI bus mastering\n");
|
|
} else {
|
|
/* setup sp0 range to local RAM size */
|
|
bcm_mpi_writel(~(mem_size - 1), MPI_SP0_RANGE_REG);
|
|
bcm_mpi_writel(0, MPI_SP1_RANGE_REG);
|
|
}
|
|
|
|
/* change host bridge retry counter to infinite number of
|
|
* retry, needed for some broadcom wifi cards with Silicon
|
|
* Backplane bus where access to srom seems very slow */
|
|
val = bcm63xx_int_cfg_readl(BCMPCI_REG_TIMERS);
|
|
val &= ~REG_TIMER_RETRY_MASK;
|
|
bcm63xx_int_cfg_writel(val, BCMPCI_REG_TIMERS);
|
|
|
|
/* enable memory decoder and bus mastering */
|
|
val = bcm63xx_int_cfg_readl(PCI_COMMAND);
|
|
val |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
|
|
bcm63xx_int_cfg_writel(val, PCI_COMMAND);
|
|
|
|
/* enable read prefetching & disable byte swapping for bus
|
|
* mastering transfers */
|
|
val = bcm_mpi_readl(MPI_PCIMODESEL_REG);
|
|
val &= ~MPI_PCIMODESEL_BAR1_NOSWAP_MASK;
|
|
val &= ~MPI_PCIMODESEL_BAR2_NOSWAP_MASK;
|
|
val &= ~MPI_PCIMODESEL_PREFETCH_MASK;
|
|
val |= (8 << MPI_PCIMODESEL_PREFETCH_SHIFT);
|
|
bcm_mpi_writel(val, MPI_PCIMODESEL_REG);
|
|
|
|
/* enable pci interrupt */
|
|
val = bcm_mpi_readl(MPI_LOCINT_REG);
|
|
val |= MPI_LOCINT_MASK(MPI_LOCINT_EXT_PCI_INT);
|
|
bcm_mpi_writel(val, MPI_LOCINT_REG);
|
|
|
|
register_pci_controller(&bcm63xx_controller);
|
|
|
|
#ifdef CONFIG_CARDBUS
|
|
register_pci_controller(&bcm63xx_cb_controller);
|
|
#endif
|
|
|
|
/* mark memory space used for IO mapping as reserved */
|
|
request_mem_region(BCM_PCI_IO_BASE_PA, BCM_PCI_IO_SIZE,
|
|
"bcm63xx PCI IO space");
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int __init bcm63xx_pci_init(void)
|
|
{
|
|
if (!bcm63xx_pci_enabled)
|
|
return -ENODEV;
|
|
|
|
switch (bcm63xx_get_cpu_id()) {
|
|
case BCM6328_CPU_ID:
|
|
case BCM6362_CPU_ID:
|
|
return bcm63xx_register_pcie();
|
|
case BCM3368_CPU_ID:
|
|
case BCM6348_CPU_ID:
|
|
case BCM6358_CPU_ID:
|
|
case BCM6368_CPU_ID:
|
|
return bcm63xx_register_pci();
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
arch_initcall(bcm63xx_pci_init);
|