--- a/arch/mips/ar231x/Makefile +++ b/arch/mips/ar231x/Makefile @@ -14,3 +14,4 @@ obj-$(CONFIG_EARLY_PRINTK) += early_prin obj-$(CONFIG_ATHEROS_AR5312) += ar5312.o obj-$(CONFIG_ATHEROS_AR2315) += ar2315.o +obj-$(CONFIG_ATHEROS_AR2315_PCI) += pci.o --- /dev/null +++ b/arch/mips/ar231x/pci.c @@ -0,0 +1,230 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/spinlock.h> +#include <linux/delay.h> +#include <linux/irq.h> +#include <asm/bootinfo.h> +#include <asm/paccess.h> +#include <asm/irq_cpu.h> +#include <asm/io.h> +#include <ar231x_platform.h> +#include <ar231x.h> +#include <ar2315_regs.h> +#include "devices.h" + +#define AR531X_MEM_BASE 0x80800000UL +#define AR531X_MEM_SIZE 0x00ffffffUL +#define AR531X_IO_SIZE 0x00007fffUL + +static unsigned long configspace; + +static int config_access(int devfn, int where, int size, u32 *ptr, bool write) +{ + unsigned long flags; + int func = PCI_FUNC(devfn); + int dev = PCI_SLOT(devfn); + u32 value = 0; + int err = 0; + u32 addr; + + if (((dev != 0) && (dev != 3)) || (func > 2)) + return PCIBIOS_DEVICE_NOT_FOUND; + + /* Select Configuration access */ + local_irq_save(flags); + ar231x_mask_reg(AR2315_PCI_MISC_CONFIG, 0, AR2315_PCIMISC_CFG_SEL); + mb(); + + addr = (u32) configspace + (1 << (13 + dev)) + (func << 8) + where; + if (size == 1) + addr ^= 0x3; + else if (size == 2) + addr ^= 0x2; + + if (write) { + value = *ptr; + if (size == 1) + err = put_dbe(value, (u8 *) addr); + else if (size == 2) + err = put_dbe(value, (u16 *) addr); + else if (size == 4) + err = put_dbe(value, (u32 *) addr); + } else { + if (size == 1) + err = get_dbe(value, (u8 *) addr); + else if (size == 2) + err = get_dbe(value, (u16 *) addr); + else if (size == 4) + err = get_dbe(value, (u32 *) addr); + if (err) + *ptr = 0xffffffff; + else + *ptr = value; + } + + /* Select Memory access */ + ar231x_mask_reg(AR2315_PCI_MISC_CONFIG, AR2315_PCIMISC_CFG_SEL, 0); + local_irq_restore(flags); + + return (err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL); +} + +static int ar231x_pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * value) +{ + return config_access(devfn, where, size, value, 0); +} + +static int ar231x_pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value) +{ + return config_access(devfn, where, size, &value, 1); +} + +struct pci_ops ar231x_pci_ops = { + .read = ar231x_pci_read, + .write = ar231x_pci_write, +}; + +static struct resource ar231x_mem_resource = { + .name = "AR531x PCI MEM", + .start = AR531X_MEM_BASE, + .end = AR531X_MEM_BASE + AR531X_MEM_SIZE - AR531X_IO_SIZE - 1 + 0x4000000, + .flags = IORESOURCE_MEM, +}; + +static struct resource ar231x_io_resource = { + .name = "AR531x PCI I/O", + .start = AR531X_MEM_BASE + AR531X_MEM_SIZE - AR531X_IO_SIZE, + .end = AR531X_MEM_BASE + AR531X_MEM_SIZE - 1, + .flags = IORESOURCE_IO, +}; + +struct pci_controller ar231x_pci_controller = { + .pci_ops = &ar231x_pci_ops, + .mem_resource = &ar231x_mem_resource, + .io_resource = &ar231x_io_resource, + .mem_offset = 0x00000000UL, + .io_offset = 0x00000000UL, +}; + +int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) +{ + return AR2315_IRQ_LCBUS_PCI; +} + +int pcibios_plat_dev_init(struct pci_dev *dev) +{ + pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 5); + pci_write_config_word(dev, 0x40, 0); + + /* Clear any pending Abort or external Interrupts + * and enable interrupt processing */ + ar231x_mask_reg(AR2315_PCI_INTEN_REG, AR2315_PCI_INT_ENABLE, 0); + ar231x_write_reg(AR2315_PCI_INT_STATUS, (AR2315_PCI_ABORT_INT | AR2315_PCI_EXT_INT)); + ar231x_write_reg(AR2315_PCI_INT_MASK, (AR2315_PCI_ABORT_INT | AR2315_PCI_EXT_INT)); + ar231x_mask_reg(AR2315_PCI_INTEN_REG, 0, AR2315_PCI_INT_ENABLE); + + return 0; +} + +static void +ar2315_pci_fixup(struct pci_dev *dev) +{ + unsigned int devfn = dev->devfn; + + if (dev->bus->number != 0) + return; + + /* Only fix up the PCI host settings */ + if ((PCI_SLOT(devfn) != 3) || (PCI_FUNC(devfn) != 0)) + return; + + /* Fix up MBARs */ + pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, HOST_PCI_MBAR0); + pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, HOST_PCI_MBAR1); + pci_write_config_dword(dev, PCI_BASE_ADDRESS_2, HOST_PCI_MBAR2); + pci_write_config_dword(dev, PCI_COMMAND, + PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_SPECIAL | + PCI_COMMAND_INVALIDATE | PCI_COMMAND_PARITY | PCI_COMMAND_SERR | + PCI_COMMAND_FAST_BACK); +} +DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, ar2315_pci_fixup); + +static int __init +ar2315_pci_init(void) +{ + u32 reg; + + if (ar231x_devtype != DEV_TYPE_AR2315) + return -ENODEV; + + configspace = (unsigned long) ioremap_nocache(0x80000000, 1*1024*1024); /* Remap PCI config space */ + ar231x_pci_controller.io_map_base = + (unsigned long) ioremap_nocache(AR531X_MEM_BASE + AR531X_MEM_SIZE, AR531X_IO_SIZE); + set_io_port_base(ar231x_pci_controller.io_map_base); /* PCI I/O space */ + + reg = ar231x_mask_reg(AR2315_RESET, 0, AR2315_RESET_PCIDMA); + msleep(10); + + reg &= ~AR2315_RESET_PCIDMA; + ar231x_write_reg(AR2315_RESET, reg); + msleep(10); + + ar231x_mask_reg(AR2315_ENDIAN_CTL, 0, + AR2315_CONFIG_PCIAHB | AR2315_CONFIG_PCIAHB_BRIDGE); + + ar231x_write_reg(AR2315_PCICLK, AR2315_PCICLK_PLLC_CLKM | + (AR2315_PCICLK_IN_FREQ_DIV_6 << AR2315_PCICLK_DIV_S)); + ar231x_mask_reg(AR2315_AHB_ARB_CTL, 0, AR2315_ARB_PCI); + ar231x_mask_reg(AR2315_IF_CTL, AR2315_IF_PCI_CLK_MASK | AR2315_IF_MASK, + AR2315_IF_PCI | AR2315_IF_PCI_HOST | AR2315_IF_PCI_INTR | + (AR2315_IF_PCI_CLK_OUTPUT_CLK << AR2315_IF_PCI_CLK_SHIFT)); + + /* Reset the PCI bus by setting bits 5-4 in PCI_MCFG */ + ar231x_mask_reg(AR2315_PCI_MISC_CONFIG, AR2315_PCIMISC_RST_MODE, + AR2315_PCIRST_LOW); + msleep(100); + + /* Bring the PCI out of reset */ + ar231x_mask_reg(AR2315_PCI_MISC_CONFIG, AR2315_PCIMISC_RST_MODE, + AR2315_PCIRST_HIGH | AR2315_PCICACHE_DIS | 0x8); + + ar231x_write_reg(AR2315_PCI_UNCACHE_CFG, + 0x1E | /* 1GB uncached */ + (1 << 5) | /* Enable uncached */ + (0x2 << 30) /* Base: 0x80000000 */ + ); + ar231x_read_reg(AR2315_PCI_UNCACHE_CFG); + + msleep(500); + + /* dirty hack - anyone with a datasheet that knows the memory map ? */ + ioport_resource.start = 0x10000000; + ioport_resource.end = 0xffffffff; + iomem_resource.start = 0x10000000; + iomem_resource.end = 0xffffffff; + + register_pci_controller(&ar231x_pci_controller); + + return 0; +} + +arch_initcall(ar2315_pci_init); --- a/arch/mips/ar231x/Kconfig +++ b/arch/mips/ar231x/Kconfig @@ -15,3 +15,13 @@ config ATHEROS_AR2315 select SYS_SUPPORTS_BIG_ENDIAN select GENERIC_GPIO default y + +config ATHEROS_AR2315_PCI + bool "PCI support" + depends on ATHEROS_AR2315 + select HW_HAS_PCI + select PCI + select USB_ARCH_HAS_HCD + select USB_ARCH_HAS_OHCI + select USB_ARCH_HAS_EHCI + default y --- a/arch/mips/ar231x/ar2315.c +++ b/arch/mips/ar231x/ar2315.c @@ -63,6 +63,27 @@ static inline void ar2315_gpio_irq(void) do_IRQ(AR531X_GPIO_IRQ_BASE + bit); } +#ifdef CONFIG_ATHEROS_AR2315_PCI +static inline void pci_abort_irq(void) +{ + ar231x_write_reg(AR2315_PCI_INT_STATUS, AR2315_PCI_ABORT_INT); +} + +static inline void pci_ack_irq(void) +{ + ar231x_write_reg(AR2315_PCI_INT_STATUS, AR2315_PCI_EXT_INT); +} + +void ar2315_pci_irq(int irq) +{ + if (ar231x_read_reg(AR2315_PCI_INT_STATUS) == AR2315_PCI_ABORT_INT) + pci_abort_irq(); + else { + do_IRQ(irq); + pci_ack_irq(); + } +} +#endif /* CONFIG_ATHEROS_AR2315_PCI */ /* * Called when an interrupt is received, this function @@ -81,6 +102,10 @@ ar2315_irq_dispatch(void) do_IRQ(AR2315_IRQ_WLAN0_INTRS); else if (pending & CAUSEF_IP4) do_IRQ(AR2315_IRQ_ENET0_INTRS); +#ifdef CONFIG_ATHEROS_AR2315_PCI + else if (pending & CAUSEF_IP5) + ar2315_pci_irq(AR2315_IRQ_LCBUS_PCI); +#endif else if (pending & CAUSEF_IP2) { unsigned int misc_intr = ar231x_read_reg(AR2315_ISR) & ar231x_read_reg(AR2315_IMR);