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alistair23-linux/arch/mips/pci/pci-lantiq.c
Paul Gortmaker 2722090af4 MIPS: pci: Audit and remove any unnecessary uses of module.h 
Historically a lot of these existed because we did not have
a distinction between what was modular code and what was providing
support to modules via EXPORT_SYMBOL and friends.  That changed
when we forked out support for the latter into the export.h file.

This means we should be able to reduce the usage of module.h
in code that is obj-y Makefile or bool Kconfig.  The advantage
in doing so is that module.h itself sources about 15 other headers;
adding significantly to what we feed cpp, and it can obscure what
headers we are effectively using.

Since module.h was the source for init.h (for __init) and for
export.h (for EXPORT_SYMBOL) we consider each obj-y/bool instance
for the presence of either and replace as needed.

We also needed to remove the no-op MODULE_DEVICE_TABLE usage in
several instances to permit removal of the module.h include.  The
files in these instances were all controlled by bool Kconfig.

In one instance, module_param was being used so we transition the
module.h include onto a moduleparam.h include.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14035/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2016-10-05 01:31:20 +02:00

254 lines
7.1 KiB
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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 <john@phrozen.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/clk.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/of_pci.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_bridge = platform_get_resource(pdev, IORESOURCE_MEM, 1);
ltq_pci_membase = devm_ioremap_resource(&pdev->dev, res_bridge);
if (IS_ERR(ltq_pci_membase))
return PTR_ERR(ltq_pci_membase);
res_cfg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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" },
{},
};
static struct platform_driver ltq_pci_driver = {
.probe = ltq_pci_probe,
.driver = {
.name = "pci-xway",
.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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