--- /dev/null
+--- a/arch/arm/Kconfig
++++ b/arch/arm/Kconfig
+@@ -381,6 +381,7 @@ config ARCH_GEMINI
+ select CLKSRC_MMIO
+ select CPU_FA526
+ select GENERIC_CLOCKEVENTS
++ select MIGHT_HAVE_PCI
+ help
+ Support for the Cortina Systems Gemini family SoCs
+
+--- a/arch/arm/mach-gemini/include/mach/hardware.h
++++ b/arch/arm/mach-gemini/include/mach/hardware.h
+@@ -71,4 +71,9 @@
+ */
+ #define IO_ADDRESS(x) IOMEM((((x) & 0xFFF00000) >> 4) | ((x) & 0x000FFFFF) | 0xF0000000)
+
++/*
++ * PCI subsystem macros
++ */
++#define pcibios_assign_all_busses() 1
++
+ #endif
+--- a/arch/arm/mach-gemini/include/mach/irqs.h
++++ b/arch/arm/mach-gemini/include/mach/irqs.h
+@@ -43,11 +43,14 @@
+
+ #define NORMAL_IRQ_NUM 32
+
+-#define GPIO_IRQ_BASE NORMAL_IRQ_NUM
++#define PCI_IRQ_BASE NORMAL_IRQ_NUM
++#define PCI_IRQ_NUM 4
++
++#define GPIO_IRQ_BASE (NORMAL_IRQ_NUM + PCI_IRQ_NUM)
+ #define GPIO_IRQ_NUM (3 * 32)
+
+ #define ARCH_TIMER_IRQ IRQ_TIMER2
+
+-#define NR_IRQS (NORMAL_IRQ_NUM + GPIO_IRQ_NUM)
++#define NR_IRQS (NORMAL_IRQ_NUM + PCI_IRQ_NUM + GPIO_IRQ_NUM)
+
+ #endif /* __MACH_IRQS_H__ */
+--- a/arch/arm/mach-gemini/Makefile
++++ b/arch/arm/mach-gemini/Makefile
+@@ -6,6 +6,8 @@
+
+ obj-y := irq.o mm.o time.o devices.o gpio.o idle.o reset.o
+
++obj-$(CONFIG_PCI) += pci.o
++
+ # Board-specific support
+ obj-$(CONFIG_MACH_NAS4220B) += board-nas4220b.o
+ obj-$(CONFIG_MACH_RUT100) += board-rut1xx.o
+--- a/arch/arm/mach-gemini/mm.c
++++ b/arch/arm/mach-gemini/mm.c
+@@ -59,6 +59,11 @@ static struct map_desc gemini_io_desc[]
+ .length = SZ_512K,
+ .type = MT_DEVICE,
+ }, {
++ .virtual = (unsigned long)IO_ADDRESS(GEMINI_PCI_IO_BASE),
++ .pfn = __phys_to_pfn(GEMINI_PCI_IO_BASE),
++ .length = SZ_512K,
++ .type = MT_DEVICE,
++ }, {
+ .virtual = (unsigned long)IO_ADDRESS(GEMINI_FLASH_CTRL_BASE),
+ .pfn = __phys_to_pfn(GEMINI_FLASH_CTRL_BASE),
+ .length = SZ_512K,
+--- /dev/null
++++ b/arch/arm/mach-gemini/pci.c
+@@ -0,0 +1,320 @@
++/*
++ * Support for Gemini PCI Controller
++ *
++ * Copyright (C) 2009 Janos Laube <janos.dev@gmail.com>
++ * Copyright (C) 2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
++ *
++ * based on SL2312 PCI controller code
++ * Storlink (C) 2003
++ *
++ * 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.
++ */
++
++#include <linux/kernel.h>
++#include <linux/pci.h>
++#include <linux/irq.h>
++#include <linux/gpio.h>
++
++#include <asm/mach/pci.h>
++
++#include <mach/irqs.h>
++#include <mach/hardware.h>
++
++#define GEMINI_PCI_IOSIZE_1M 0x0000
++
++#define GEMINI_PCI_PMC 0x40
++#define GEMINI_PCI_PMCSR 0x44
++#define GEMINI_PCI_CTRL1 0x48
++#define GEMINI_PCI_CTRL2 0x4C
++#define GEMINI_PCI_MEM1_BASE_SIZE 0x50
++#define GEMINI_PCI_MEM2_BASE_SIZE 0x54
++#define GEMINI_PCI_MEM3_BASE_SIZE 0x58
++
++#define PCI_CTRL2_INTSTS_OFFSET 28
++#define PCI_CTRL2_INTMASK_OFFSET 22
++
++#define GEMINI_PCI_DMA_MASK 0xFFF00000
++#define GEMINI_PCI_DMA_MEM1_BASE 0x00000000
++#define GEMINI_PCI_DMA_MEM2_BASE 0x00000000
++#define GEMINI_PCI_DMA_MEM3_BASE 0x00000000
++#define GEMINI_PCI_DMA_MEM1_SIZE 7
++#define GEMINI_PCI_DMA_MEM2_SIZE 6
++#define GEMINI_PCI_DMA_MEM3_SIZE 6
++
++#define PCI_CONF_ENABLE (1 << 31)
++#define PCI_CONF_WHERE(r) ((r) & 0xFC)
++#define PCI_CONF_BUS(b) (((b) & 0xFF) << 16)
++#define PCI_CONF_DEVICE(d) (((d) & 0x1F) << 11)
++#define PCI_CONF_FUNCTION(f) (((f) & 0x07) << 8)
++
++#define PCI_IOSIZE_REG (IO_ADDRESS(GEMINI_PCI_IO_BASE))
++#define PCI_PROT_REG (IO_ADDRESS(GEMINI_PCI_IO_BASE) + 0x04)
++#define PCI_CTRL_REG (IO_ADDRESS(GEMINI_PCI_IO_BASE) + 0x08)
++#define PCI_SOFTRST_REG (IO_ADDRESS(GEMINI_PCI_IO_BASE) + 0x10)
++#define PCI_CONFIG_REG (IO_ADDRESS(GEMINI_PCI_IO_BASE) + 0x28)
++#define PCI_DATA_REG (IO_ADDRESS(GEMINI_PCI_IO_BASE) + 0x2C)
++
++
++static DEFINE_SPINLOCK(gemini_pci_lock);
++
++static int gemini_pci_read_config(struct pci_bus* bus, unsigned int fn,
++ int config, int size, u32* value)
++{
++ unsigned long irq_flags;
++
++ spin_lock_irqsave(&gemini_pci_lock, irq_flags);
++
++ __raw_writel(PCI_CONF_BUS(bus->number) |
++ PCI_CONF_DEVICE(PCI_SLOT(fn)) |
++ PCI_CONF_FUNCTION(PCI_FUNC(fn)) |
++ PCI_CONF_WHERE(config) |
++ PCI_CONF_ENABLE,
++ PCI_CONFIG_REG);
++
++ *value = __raw_readl(PCI_DATA_REG);
++
++ if (size == 1)
++ *value = (*value >> (8 * (config & 3))) & 0xFF;
++ else if (size == 2)
++ *value = (*value >> (8 * (config & 3))) & 0xFFFF;
++
++ spin_unlock_irqrestore(&gemini_pci_lock, irq_flags);
++
++ dev_dbg(&bus->dev,
++ "[read] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n",
++ PCI_SLOT(fn), PCI_FUNC(fn), config, size, *value);
++
++ return PCIBIOS_SUCCESSFUL;
++}
++
++static int gemini_pci_write_config(struct pci_bus* bus, unsigned int fn,
++ int config, int size, u32 value)
++{
++ unsigned long irq_flags = 0;
++ int ret = PCIBIOS_SUCCESSFUL;
++
++ dev_dbg(&bus->dev,
++ "[write] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n",
++ PCI_SLOT(fn), PCI_FUNC(fn), config, size, value);
++
++ spin_lock_irqsave(&gemini_pci_lock, irq_flags);
++
++ __raw_writel(PCI_CONF_BUS(bus->number) |
++ PCI_CONF_DEVICE(PCI_SLOT(fn)) |
++ PCI_CONF_FUNCTION(PCI_FUNC(fn)) |
++ PCI_CONF_WHERE(config) |
++ PCI_CONF_ENABLE,
++ PCI_CONFIG_REG);
++
++ switch(size) {
++ case 4:
++ __raw_writel(value, PCI_DATA_REG);
++ break;
++ case 2:
++ __raw_writew(value, PCI_DATA_REG + (config & 3));
++ break;
++ case 1:
++ __raw_writeb(value, PCI_DATA_REG + (config & 3));
++ break;
++ default:
++ ret = PCIBIOS_BAD_REGISTER_NUMBER;
++ }
++
++ spin_unlock_irqrestore(&gemini_pci_lock, irq_flags);
++
++ return ret;
++}
++
++static struct pci_ops gemini_pci_ops = {
++ .read = gemini_pci_read_config,
++ .write = gemini_pci_write_config,
++};
++
++static struct resource gemini_pci_resource_io = {
++ .name = "PCI I/O Space",
++ .start = GEMINI_PCI_IO_BASE,
++ .end = GEMINI_PCI_IO_BASE + SZ_1M - 1,
++ .flags = IORESOURCE_IO,
++};
++
++static struct resource gemini_pci_resource_mem = {
++ .name = "PCI Memory Space",
++ .start = GEMINI_PCI_MEM_BASE,
++ .end = GEMINI_PCI_MEM_BASE + SZ_128M - 1,
++ .flags = IORESOURCE_MEM,
++};
++
++static int __init gemini_pci_request_resources(struct pci_sys_data *sys)
++{
++ if (request_resource(&ioport_resource, &gemini_pci_resource_io))
++ goto bad_resources;
++ if (request_resource(&iomem_resource, &gemini_pci_resource_mem))
++ goto bad_resources;
++
++ pci_add_resource(&sys->resources, &gemini_pci_resource_io);
++ pci_add_resource(&sys->resources, &gemini_pci_resource_mem);
++
++ return 0;
++
++bad_resources:
++ pr_err("Gemini PCI: request_resource() failed. "
++ "Abort PCI bus enumeration.\n");
++ return -1;
++}
++
++static int __init gemini_pci_setup(int nr, struct pci_sys_data *sys)
++{
++ unsigned int cmd;
++
++ pcibios_min_io = 0x100;
++ pcibios_min_mem = 0;
++
++ if ((nr > 0) || gemini_pci_request_resources(sys))
++ return 0;
++
++ /* setup I/O space to 1MB size */
++ __raw_writel(GEMINI_PCI_IOSIZE_1M, PCI_IOSIZE_REG);
++
++ /* setup hostbridge */
++ cmd = __raw_readl(PCI_CTRL_REG);
++ cmd |= PCI_COMMAND_IO;
++ cmd |= PCI_COMMAND_MEMORY;
++ cmd |= PCI_COMMAND_MASTER;
++ __raw_writel(cmd, PCI_CTRL_REG);
++
++ return 1;
++}
++
++static struct pci_bus* __init gemini_pci_scan_bus(int nr, struct pci_sys_data* sys)
++{
++ unsigned int reg = 0;
++ struct pci_bus* bus = 0;
++
++ bus = pci_scan_bus(nr, &gemini_pci_ops, sys);
++ if (bus) {
++ dev_dbg(&bus->dev, "setting up PCI DMA\n");
++ reg = (GEMINI_PCI_DMA_MEM1_BASE & GEMINI_PCI_DMA_MASK)
++ | (GEMINI_PCI_DMA_MEM1_SIZE << 16);
++ gemini_pci_write_config(bus, 0, GEMINI_PCI_MEM1_BASE_SIZE, 4, reg);
++ reg = (GEMINI_PCI_DMA_MEM2_BASE & GEMINI_PCI_DMA_MASK)
++ | (GEMINI_PCI_DMA_MEM2_SIZE << 16);
++ gemini_pci_write_config(bus, 0, GEMINI_PCI_MEM2_BASE_SIZE, 4, reg);
++ reg = (GEMINI_PCI_DMA_MEM3_BASE & GEMINI_PCI_DMA_MASK)
++ | (GEMINI_PCI_DMA_MEM3_SIZE << 16);
++ gemini_pci_write_config(bus, 0, GEMINI_PCI_MEM3_BASE_SIZE, 4, reg);
++ }
++
++ return bus;
++}
++
++/* Should work with all boards based on original Storlink EVB */
++static int __init gemini_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
++{
++ if (slot < 9 || slot > 12)
++ return -1;
++
++ return PCI_IRQ_BASE + (((slot - 9) + (pin - 1)) & 0x3);
++}
++
++static struct hw_pci gemini_hw_pci __initdata = {
++ .nr_controllers = 1,
++ .setup = gemini_pci_setup,
++ .scan = gemini_pci_scan_bus,
++ .map_irq = gemini_pci_map_irq,
++};
++
++/* we need this for muxed PCI interrupts handling */
++static struct pci_bus bogus_pci_bus;
++
++static void gemini_pci_ack_irq(struct irq_data *d)
++{
++ unsigned int irq = d->irq;
++ unsigned int reg;
++
++ gemini_pci_read_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2, 4, ®);
++ reg &= ~(0xF << PCI_CTRL2_INTSTS_OFFSET);
++ reg |= 1 << (irq - PCI_IRQ_BASE + PCI_CTRL2_INTSTS_OFFSET);
++ gemini_pci_write_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2, 4, reg);
++}
++
++static void gemini_pci_mask_irq(struct irq_data *d)
++{
++ unsigned int irq = d->irq;
++ unsigned int reg;
++
++ gemini_pci_read_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2, 4, ®);
++ reg &= ~((0xF << PCI_CTRL2_INTSTS_OFFSET)
++ | (1 << (irq - PCI_IRQ_BASE + PCI_CTRL2_INTMASK_OFFSET)));
++ gemini_pci_write_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2, 4, reg);
++}
++
++static void gemini_pci_unmask_irq(struct irq_data *d)
++{
++ unsigned int irq = d->irq;
++ unsigned int reg;
++
++ gemini_pci_read_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2, 4, ®);
++ reg &= ~(0xF << PCI_CTRL2_INTSTS_OFFSET);
++ reg |= 1 << (irq - PCI_IRQ_BASE + PCI_CTRL2_INTMASK_OFFSET);
++ gemini_pci_write_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2, 4, reg);
++}
++
++static void gemini_pci_irq_handler(unsigned int irq, struct irq_desc *desc)
++{
++ unsigned int pci_irq_no, irq_stat, reg, i;
++
++ gemini_pci_read_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2, 4, ®);
++ irq_stat = reg >> PCI_CTRL2_INTSTS_OFFSET;
++
++ for (i = 0; i < 4; i++) {
++
++ if ((irq_stat & (1 << i)) == 0)
++ continue;
++
++ pci_irq_no = PCI_IRQ_BASE + i;
++
++ BUG_ON(!(irq_desc[pci_irq_no].handle_irq));
++ irq_desc[pci_irq_no].handle_irq(pci_irq_no,
++ &irq_desc[pci_irq_no]);
++ }
++}
++
++static struct irq_chip gemini_pci_irq_chip = {
++ .name = "PCI",
++ .irq_ack = gemini_pci_ack_irq,
++ .irq_mask = gemini_pci_mask_irq,
++ .irq_unmask = gemini_pci_unmask_irq,
++};
++
++static int __init gemini_pci_init(void)
++{
++ int i;
++
++ for (i = 72; i <= 95; i++)
++ gpio_request(i, "PCI");
++
++ /* initialize our bogus bus */
++ dev_set_name(&bogus_pci_bus.dev, "PCI IRQ handler");
++ bogus_pci_bus.number = 0;
++
++ /* mask and clear all interrupts */
++ gemini_pci_write_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2 + 2, 2,
++ 0xF000);
++
++ for (i = PCI_IRQ_BASE; i < PCI_IRQ_BASE + 4; i++) {
++ irq_set_chip_and_handler(i, &gemini_pci_irq_chip,
++ handle_level_irq);
++ set_irq_flags(i, IRQF_VALID);
++ }
++
++ irq_set_chained_handler(IRQ_PCI, gemini_pci_irq_handler);
++
++ pci_common_init(&gemini_hw_pci);
++
++ return 0;
++}
++
++subsys_initcall(gemini_pci_init);
projects / openwrt.git / blobdiff