/* * 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);