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linux-sg2042/arch/mips/pci/pci-lantiq.c

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/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* Copyright (C) 2010 John Crispin <blogic@openwrt.org>
*/
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/of_pci.h>
#include <asm/pci.h>
#include <asm/gpio.h>
#include <asm/addrspace.h>
#include <lantiq_soc.h>
#include <lantiq_irq.h>
#include "pci-lantiq.h"
#define PCI_CR_FCI_ADDR_MAP0 0x00C0
#define PCI_CR_FCI_ADDR_MAP1 0x00C4
#define PCI_CR_FCI_ADDR_MAP2 0x00C8
#define PCI_CR_FCI_ADDR_MAP3 0x00CC
#define PCI_CR_FCI_ADDR_MAP4 0x00D0
#define PCI_CR_FCI_ADDR_MAP5 0x00D4
#define PCI_CR_FCI_ADDR_MAP6 0x00D8
#define PCI_CR_FCI_ADDR_MAP7 0x00DC
#define PCI_CR_CLK_CTRL 0x0000
#define PCI_CR_PCI_MOD 0x0030
#define PCI_CR_PC_ARB 0x0080
#define PCI_CR_FCI_ADDR_MAP11hg 0x00E4
#define PCI_CR_BAR11MASK 0x0044
#define PCI_CR_BAR12MASK 0x0048
#define PCI_CR_BAR13MASK 0x004C
#define PCI_CS_BASE_ADDR1 0x0010
#define PCI_CR_PCI_ADDR_MAP11 0x0064
#define PCI_CR_FCI_BURST_LENGTH 0x00E8
#define PCI_CR_PCI_EOI 0x002C
#define PCI_CS_STS_CMD 0x0004
#define PCI_MASTER0_REQ_MASK_2BITS 8
#define PCI_MASTER1_REQ_MASK_2BITS 10
#define PCI_MASTER2_REQ_MASK_2BITS 12
#define INTERNAL_ARB_ENABLE_BIT 0
#define LTQ_CGU_IFCCR 0x0018
#define LTQ_CGU_PCICR 0x0034
#define ltq_pci_w32(x, y) ltq_w32((x), ltq_pci_membase + (y))
#define ltq_pci_r32(x) ltq_r32(ltq_pci_membase + (x))
#define ltq_pci_cfg_w32(x, y) ltq_w32((x), ltq_pci_mapped_cfg + (y))
#define ltq_pci_cfg_r32(x) ltq_r32(ltq_pci_mapped_cfg + (x))
__iomem void *ltq_pci_mapped_cfg;
static __iomem void *ltq_pci_membase;
static int reset_gpio;
static struct clk *clk_pci, *clk_external;
static struct resource pci_io_resource;
static struct resource pci_mem_resource;
static struct pci_ops pci_ops = {
.read = ltq_pci_read_config_dword,
.write = ltq_pci_write_config_dword
};
static struct pci_controller pci_controller = {
.pci_ops = &pci_ops,
.mem_resource = &pci_mem_resource,
.mem_offset = 0x00000000UL,
.io_resource = &pci_io_resource,
.io_offset = 0x00000000UL,
};
static inline u32 ltq_calc_bar11mask(void)
{
u32 mem, bar11mask;
/* BAR11MASK value depends on available memory on system. */
mem = get_num_physpages() * PAGE_SIZE;
bar11mask = (0x0ffffff0 & ~((1 << (fls(mem) - 1)) - 1)) | 8;
return bar11mask;
}
static int ltq_pci_startup(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
const __be32 *req_mask, *bus_clk;
u32 temp_buffer;
/* get our clocks */
clk_pci = clk_get(&pdev->dev, NULL);
if (IS_ERR(clk_pci)) {
dev_err(&pdev->dev, "failed to get pci clock\n");
return PTR_ERR(clk_pci);
}
clk_external = clk_get(&pdev->dev, "external");
if (IS_ERR(clk_external)) {
clk_put(clk_pci);
dev_err(&pdev->dev, "failed to get external pci clock\n");
return PTR_ERR(clk_external);
}
/* read the bus speed that we want */
bus_clk = of_get_property(node, "lantiq,bus-clock", NULL);
if (bus_clk)
clk_set_rate(clk_pci, *bus_clk);
/* and enable the clocks */
clk_enable(clk_pci);
if (of_find_property(node, "lantiq,external-clock", NULL))
clk_enable(clk_external);
else
clk_disable(clk_external);
/* setup reset gpio used by pci */
reset_gpio = of_get_named_gpio(node, "gpio-reset", 0);
if (gpio_is_valid(reset_gpio)) {
int ret = devm_gpio_request(&pdev->dev,
reset_gpio, "pci-reset");
if (ret) {
dev_err(&pdev->dev,
"failed to request gpio %d\n", reset_gpio);
return ret;
}
gpio_direction_output(reset_gpio, 1);
}
/* enable auto-switching between PCI and EBU */
ltq_pci_w32(0xa, PCI_CR_CLK_CTRL);
/* busy, i.e. configuration is not done, PCI access has to be retried */
ltq_pci_w32(ltq_pci_r32(PCI_CR_PCI_MOD) & ~(1 << 24), PCI_CR_PCI_MOD);
wmb();
/* BUS Master/IO/MEM access */
ltq_pci_cfg_w32(ltq_pci_cfg_r32(PCI_CS_STS_CMD) | 7, PCI_CS_STS_CMD);
/* enable external 2 PCI masters */
temp_buffer = ltq_pci_r32(PCI_CR_PC_ARB);
/* setup the request mask */
req_mask = of_get_property(node, "req-mask", NULL);
if (req_mask)
temp_buffer &= ~((*req_mask & 0xf) << 16);
else
temp_buffer &= ~0xf0000;
/* enable internal arbiter */
temp_buffer |= (1 << INTERNAL_ARB_ENABLE_BIT);
/* enable internal PCI master reqest */
temp_buffer &= (~(3 << PCI_MASTER0_REQ_MASK_2BITS));
/* enable EBU request */
temp_buffer &= (~(3 << PCI_MASTER1_REQ_MASK_2BITS));
/* enable all external masters request */
temp_buffer &= (~(3 << PCI_MASTER2_REQ_MASK_2BITS));
ltq_pci_w32(temp_buffer, PCI_CR_PC_ARB);
wmb();
/* setup BAR memory regions */
ltq_pci_w32(0x18000000, PCI_CR_FCI_ADDR_MAP0);
ltq_pci_w32(0x18400000, PCI_CR_FCI_ADDR_MAP1);
ltq_pci_w32(0x18800000, PCI_CR_FCI_ADDR_MAP2);
ltq_pci_w32(0x18c00000, PCI_CR_FCI_ADDR_MAP3);
ltq_pci_w32(0x19000000, PCI_CR_FCI_ADDR_MAP4);
ltq_pci_w32(0x19400000, PCI_CR_FCI_ADDR_MAP5);
ltq_pci_w32(0x19800000, PCI_CR_FCI_ADDR_MAP6);
ltq_pci_w32(0x19c00000, PCI_CR_FCI_ADDR_MAP7);
ltq_pci_w32(0x1ae00000, PCI_CR_FCI_ADDR_MAP11hg);
ltq_pci_w32(ltq_calc_bar11mask(), PCI_CR_BAR11MASK);
ltq_pci_w32(0, PCI_CR_PCI_ADDR_MAP11);
ltq_pci_w32(0, PCI_CS_BASE_ADDR1);
/* both TX and RX endian swap are enabled */
ltq_pci_w32(ltq_pci_r32(PCI_CR_PCI_EOI) | 3, PCI_CR_PCI_EOI);
wmb();
ltq_pci_w32(ltq_pci_r32(PCI_CR_BAR12MASK) | 0x80000000,
PCI_CR_BAR12MASK);
ltq_pci_w32(ltq_pci_r32(PCI_CR_BAR13MASK) | 0x80000000,
PCI_CR_BAR13MASK);
/*use 8 dw burst length */
ltq_pci_w32(0x303, PCI_CR_FCI_BURST_LENGTH);
ltq_pci_w32(ltq_pci_r32(PCI_CR_PCI_MOD) | (1 << 24), PCI_CR_PCI_MOD);
wmb();
/* setup irq line */
ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_PCC_CON) | 0xc, LTQ_EBU_PCC_CON);
ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_PCC_IEN) | 0x10, LTQ_EBU_PCC_IEN);
/* toggle reset pin */
if (gpio_is_valid(reset_gpio)) {
__gpio_set_value(reset_gpio, 0);
wmb();
mdelay(1);
__gpio_set_value(reset_gpio, 1);
}
return 0;
}
static int ltq_pci_probe(struct platform_device *pdev)
{
struct resource *res_cfg, *res_bridge;
pci_clear_flags(PCI_PROBE_ONLY);
res_cfg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
res_bridge = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res_cfg || !res_bridge) {
dev_err(&pdev->dev, "missing memory reources\n");
return -EINVAL;
}
ltq_pci_membase = devm_ioremap_resource(&pdev->dev, res_bridge);
if (IS_ERR(ltq_pci_membase))
return PTR_ERR(ltq_pci_membase);
ltq_pci_mapped_cfg = devm_ioremap_resource(&pdev->dev, res_cfg);
if (IS_ERR(ltq_pci_mapped_cfg))
return PTR_ERR(ltq_pci_mapped_cfg);
ltq_pci_startup(pdev);
pci_load_of_ranges(&pci_controller, pdev->dev.of_node);
register_pci_controller(&pci_controller);
return 0;
}
static const struct of_device_id ltq_pci_match[] = {
{ .compatible = "lantiq,pci-xway" },
{},
};
MODULE_DEVICE_TABLE(of, ltq_pci_match);
static struct platform_driver ltq_pci_driver = {
.probe = ltq_pci_probe,
.driver = {
.name = "pci-xway",
.owner = THIS_MODULE,
.of_match_table = ltq_pci_match,
},
};
int __init pcibios_init(void)
{
int ret = platform_driver_register(&ltq_pci_driver);
if (ret)
pr_info("pci-xway: Error registering platform driver!");
return ret;
}
arch_initcall(pcibios_init);
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