318 lines
8.4 KiB
C
318 lines
8.4 KiB
C
/*
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* Support for Gemini PCI Controller
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*
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* Copyright (C) 2009 Janos Laube <janos.dev@gmail.com>
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* Copyright (C) 2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
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*
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* based on SL2312 PCI controller code
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* Storlink (C) 2003
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/irq.h>
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#include <linux/gpio.h>
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#include <asm/mach/pci.h>
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#include <mach/irqs.h>
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#include <mach/hardware.h>
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#define GEMINI_PCI_IOSIZE_1M 0x0000
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#define GEMINI_PCI_PMC 0x40
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#define GEMINI_PCI_PMCSR 0x44
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#define GEMINI_PCI_CTRL1 0x48
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#define GEMINI_PCI_CTRL2 0x4C
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#define GEMINI_PCI_MEM1_BASE_SIZE 0x50
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#define GEMINI_PCI_MEM2_BASE_SIZE 0x54
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#define GEMINI_PCI_MEM3_BASE_SIZE 0x58
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#define PCI_CTRL2_INTSTS_OFFSET 28
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#define PCI_CTRL2_INTMASK_OFFSET 22
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#define GEMINI_PCI_DMA_MASK 0xFFF00000
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#define GEMINI_PCI_DMA_MEM1_BASE 0x00000000
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#define GEMINI_PCI_DMA_MEM2_BASE 0x00000000
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#define GEMINI_PCI_DMA_MEM3_BASE 0x00000000
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#define GEMINI_PCI_DMA_MEM1_SIZE 7
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#define GEMINI_PCI_DMA_MEM2_SIZE 6
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#define GEMINI_PCI_DMA_MEM3_SIZE 6
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#define PCI_CONF_ENABLE (1 << 31)
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#define PCI_CONF_WHERE(r) ((r) & 0xFC)
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#define PCI_CONF_BUS(b) (((b) & 0xFF) << 16)
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#define PCI_CONF_DEVICE(d) (((d) & 0x1F) << 11)
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#define PCI_CONF_FUNCTION(f) (((f) & 0x07) << 8)
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#define PCI_IOSIZE_REG (IO_ADDRESS(GEMINI_PCI_IO_BASE))
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#define PCI_PROT_REG (IO_ADDRESS(GEMINI_PCI_IO_BASE) + 0x04)
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#define PCI_CTRL_REG (IO_ADDRESS(GEMINI_PCI_IO_BASE) + 0x08)
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#define PCI_SOFTRST_REG (IO_ADDRESS(GEMINI_PCI_IO_BASE) + 0x10)
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#define PCI_CONFIG_REG (IO_ADDRESS(GEMINI_PCI_IO_BASE) + 0x28)
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#define PCI_DATA_REG (IO_ADDRESS(GEMINI_PCI_IO_BASE) + 0x2C)
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static DEFINE_SPINLOCK(gemini_pci_lock);
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static int gemini_pci_read_config(struct pci_bus* bus, unsigned int fn,
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int config, int size, u32* value)
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{
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unsigned long irq_flags;
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spin_lock_irqsave(&gemini_pci_lock, irq_flags);
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__raw_writel(PCI_CONF_BUS(bus->number) |
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PCI_CONF_DEVICE(PCI_SLOT(fn)) |
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PCI_CONF_FUNCTION(PCI_FUNC(fn)) |
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PCI_CONF_WHERE(config) |
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PCI_CONF_ENABLE,
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PCI_CONFIG_REG);
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*value = __raw_readl(PCI_DATA_REG);
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if (size == 1)
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*value = (*value >> (8 * (config & 3))) & 0xFF;
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else if (size == 2)
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*value = (*value >> (8 * (config & 3))) & 0xFFFF;
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spin_unlock_irqrestore(&gemini_pci_lock, irq_flags);
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dev_dbg(&bus->dev,
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"[read] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n",
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PCI_SLOT(fn), PCI_FUNC(fn), config, size, *value);
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return PCIBIOS_SUCCESSFUL;
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}
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static int gemini_pci_write_config(struct pci_bus* bus, unsigned int fn,
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int config, int size, u32 value)
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{
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unsigned long irq_flags = 0;
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int ret = PCIBIOS_SUCCESSFUL;
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dev_dbg(&bus->dev,
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"[write] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n",
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PCI_SLOT(fn), PCI_FUNC(fn), config, size, value);
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spin_lock_irqsave(&gemini_pci_lock, irq_flags);
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__raw_writel(PCI_CONF_BUS(bus->number) |
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PCI_CONF_DEVICE(PCI_SLOT(fn)) |
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PCI_CONF_FUNCTION(PCI_FUNC(fn)) |
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PCI_CONF_WHERE(config) |
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PCI_CONF_ENABLE,
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PCI_CONFIG_REG);
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switch(size) {
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case 4:
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__raw_writel(value, PCI_DATA_REG);
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break;
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case 2:
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__raw_writew(value, PCI_DATA_REG + (config & 3));
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break;
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case 1:
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__raw_writeb(value, PCI_DATA_REG + (config & 3));
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break;
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default:
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ret = PCIBIOS_BAD_REGISTER_NUMBER;
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}
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spin_unlock_irqrestore(&gemini_pci_lock, irq_flags);
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return ret;
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}
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static struct pci_ops gemini_pci_ops = {
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.read = gemini_pci_read_config,
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.write = gemini_pci_write_config,
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};
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static struct resource gemini_pci_resource_io = {
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.name = "PCI I/O Space",
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.start = GEMINI_PCI_IO_BASE,
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.end = GEMINI_PCI_IO_BASE + SZ_1M - 1,
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.flags = IORESOURCE_IO,
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};
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static struct resource gemini_pci_resource_mem = {
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.name = "PCI Memory Space",
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.start = GEMINI_PCI_MEM_BASE,
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.end = GEMINI_PCI_MEM_BASE + SZ_128M - 1,
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.flags = IORESOURCE_MEM,
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};
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static int __init gemini_pci_request_resources(struct pci_sys_data *sys)
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{
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if (request_resource(&ioport_resource, &gemini_pci_resource_io))
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goto bad_resources;
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if (request_resource(&iomem_resource, &gemini_pci_resource_mem))
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goto bad_resources;
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pci_add_resource(&sys->resources, &gemini_pci_resource_io);
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pci_add_resource(&sys->resources, &gemini_pci_resource_mem);
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return 0;
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bad_resources:
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pr_err("Gemini PCI: request_resource() failed. "
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"Abort PCI bus enumeration.\n");
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return -1;
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}
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static int __init gemini_pci_setup(int nr, struct pci_sys_data *sys)
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{
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unsigned int cmd;
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pcibios_min_io = 0x100;
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pcibios_min_mem = 0;
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if ((nr > 0) || gemini_pci_request_resources(sys))
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return 0;
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/* setup I/O space to 1MB size */
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__raw_writel(GEMINI_PCI_IOSIZE_1M, PCI_IOSIZE_REG);
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/* setup hostbridge */
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cmd = __raw_readl(PCI_CTRL_REG);
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cmd |= PCI_COMMAND_IO;
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cmd |= PCI_COMMAND_MEMORY;
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cmd |= PCI_COMMAND_MASTER;
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__raw_writel(cmd, PCI_CTRL_REG);
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return 1;
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}
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static struct pci_bus* __init gemini_pci_scan_bus(int nr, struct pci_sys_data* sys)
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{
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unsigned int reg = 0;
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struct pci_bus* bus = 0;
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bus = pci_scan_bus(nr, &gemini_pci_ops, sys);
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if (bus) {
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dev_dbg(&bus->dev, "setting up PCI DMA\n");
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reg = (GEMINI_PCI_DMA_MEM1_BASE & GEMINI_PCI_DMA_MASK)
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| (GEMINI_PCI_DMA_MEM1_SIZE << 16);
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gemini_pci_write_config(bus, 0, GEMINI_PCI_MEM1_BASE_SIZE, 4, reg);
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reg = (GEMINI_PCI_DMA_MEM2_BASE & GEMINI_PCI_DMA_MASK)
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| (GEMINI_PCI_DMA_MEM2_SIZE << 16);
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gemini_pci_write_config(bus, 0, GEMINI_PCI_MEM2_BASE_SIZE, 4, reg);
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reg = (GEMINI_PCI_DMA_MEM3_BASE & GEMINI_PCI_DMA_MASK)
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| (GEMINI_PCI_DMA_MEM3_SIZE << 16);
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gemini_pci_write_config(bus, 0, GEMINI_PCI_MEM3_BASE_SIZE, 4, reg);
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}
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return bus;
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}
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/* Should work with all boards based on original Storlink EVB */
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static int __init gemini_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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{
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if (slot < 9 || slot > 12)
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return -1;
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return PCI_IRQ_BASE + (((slot - 9) + (pin - 1)) & 0x3);
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}
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static struct hw_pci gemini_hw_pci __initdata = {
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.nr_controllers = 1,
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.setup = gemini_pci_setup,
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.scan = gemini_pci_scan_bus,
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.map_irq = gemini_pci_map_irq,
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};
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/* we need this for muxed PCI interrupts handling */
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static struct pci_bus bogus_pci_bus;
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static void gemini_pci_ack_irq(struct irq_data *d)
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{
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unsigned int irq = d->irq;
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unsigned int reg;
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gemini_pci_read_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2, 4, ®);
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reg &= ~(0xF << PCI_CTRL2_INTSTS_OFFSET);
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reg |= 1 << (irq - PCI_IRQ_BASE + PCI_CTRL2_INTSTS_OFFSET);
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gemini_pci_write_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2, 4, reg);
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}
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static void gemini_pci_mask_irq(struct irq_data *d)
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{
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unsigned int irq = d->irq;
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unsigned int reg;
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gemini_pci_read_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2, 4, ®);
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reg &= ~((0xF << PCI_CTRL2_INTSTS_OFFSET)
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| (1 << (irq - PCI_IRQ_BASE + PCI_CTRL2_INTMASK_OFFSET)));
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gemini_pci_write_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2, 4, reg);
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}
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static void gemini_pci_unmask_irq(struct irq_data *d)
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{
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unsigned int irq = d->irq;
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unsigned int reg;
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gemini_pci_read_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2, 4, ®);
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reg &= ~(0xF << PCI_CTRL2_INTSTS_OFFSET);
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reg |= 1 << (irq - PCI_IRQ_BASE + PCI_CTRL2_INTMASK_OFFSET);
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gemini_pci_write_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2, 4, reg);
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}
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static void gemini_pci_irq_handler(struct irq_desc *desc)
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{
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unsigned int pci_irq_no, irq_stat, reg, i;
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gemini_pci_read_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2, 4, ®);
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irq_stat = reg >> PCI_CTRL2_INTSTS_OFFSET;
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for (i = 0; i < 4; i++) {
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if ((irq_stat & (1 << i)) == 0)
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continue;
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pci_irq_no = PCI_IRQ_BASE + i;
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BUG_ON(!(irq_desc[pci_irq_no].handle_irq));
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irq_desc[pci_irq_no].handle_irq(&irq_desc[pci_irq_no]);
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}
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}
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static struct irq_chip gemini_pci_irq_chip = {
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.name = "PCI",
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.irq_ack = gemini_pci_ack_irq,
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.irq_mask = gemini_pci_mask_irq,
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.irq_unmask = gemini_pci_unmask_irq,
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};
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static int __init gemini_pci_init(void)
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{
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int i;
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for (i = 72; i <= 95; i++)
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gpio_request(i, "PCI");
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/* initialize our bogus bus */
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dev_set_name(&bogus_pci_bus.dev, "PCI IRQ handler");
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bogus_pci_bus.number = 0;
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/* mask and clear all interrupts */
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gemini_pci_write_config(&bogus_pci_bus, 0, GEMINI_PCI_CTRL2 + 2, 2,
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0xF000);
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for (i = PCI_IRQ_BASE; i < PCI_IRQ_BASE + 4; i++) {
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irq_set_chip_and_handler(i, &gemini_pci_irq_chip,
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handle_level_irq);
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}
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irq_set_chained_handler(IRQ_PCI, gemini_pci_irq_handler);
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pci_common_init(&gemini_hw_pci);
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return 0;
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}
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subsys_initcall(gemini_pci_init);
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