Initial import

1 files changed, 351 insertions, 0 deletions

diff --git a/arch/mips/pci/pci-bcm63xx.c b/arch/mips/pci/pci-bcm63xx.c
new file mode 100644
index 000000000..151d9b587
--- /dev/null
+++ b/arch/mips/pci/pci-bcm63xx.c
@@ -0,0 +1,351 @@
+/*
+ * 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 << IDVAL3_SUBCLASS_SHIFT);
+	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_nocache(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);