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/*
* Copyright 2014-2015 Freescale Semiconductor, Inc.
* Layerscape PCIe driver
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <pci.h>
#include <asm/arch/fsl_serdes.h>
#include <asm/io.h>
#include <errno.h>
#ifdef CONFIG_OF_BOARD_SETUP
#include <libfdt.h>
#include <fdt_support.h>
#include "pcie_layerscape.h"
#ifdef CONFIG_FSL_LSCH3
/*
* Return next available LUT index.
*/
static int ls_pcie_next_lut_index(struct ls_pcie *pcie)
{
if (pcie->next_lut_index < PCIE_LUT_ENTRY_COUNT)
return pcie->next_lut_index++;
else
return -ENOSPC; /* LUT is full */
}
/* returns the next available streamid for pcie, -errno if failed */
static int ls_pcie_next_streamid(void)
{
static int next_stream_id = FSL_PEX_STREAM_ID_START;
if (next_stream_id > FSL_PEX_STREAM_ID_END)
return -EINVAL;
return next_stream_id++;
}
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static void lut_writel(struct ls_pcie *pcie, unsigned int value,
unsigned int offset)
{
if (pcie->big_endian)
out_be32(pcie->lut + offset, value);
else
out_le32(pcie->lut + offset, value);
}
/*
* Program a single LUT entry
*/
static void ls_pcie_lut_set_mapping(struct ls_pcie *pcie, int index, u32 devid,
u32 streamid)
{
/* leave mask as all zeroes, want to match all bits */
lut_writel(pcie, devid << 16, PCIE_LUT_UDR(index));
lut_writel(pcie, streamid | PCIE_LUT_ENABLE, PCIE_LUT_LDR(index));
}
/*
* An msi-map is a property to be added to the pci controller
* node. It is a table, where each entry consists of 4 fields
* e.g.:
*
* msi-map = <[devid] [phandle-to-msi-ctrl] [stream-id] [count]
* [devid] [phandle-to-msi-ctrl] [stream-id] [count]>;
*/
static void fdt_pcie_set_msi_map_entry(void *blob, struct ls_pcie *pcie,
u32 devid, u32 streamid)
{
u32 *prop;
u32 phandle;
int nodeoffset;
/* find pci controller node */
nodeoffset = fdt_node_offset_by_compat_reg(blob, "fsl,ls-pcie",
pcie->dbi_res.start);
if (nodeoffset < 0) {
#ifdef CONFIG_FSL_PCIE_COMPAT /* Compatible with older version of dts node */
nodeoffset = fdt_node_offset_by_compat_reg(blob,
CONFIG_FSL_PCIE_COMPAT, pcie->dbi_res.start);
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if (nodeoffset < 0)
return;
#else
return;
#endif
}
/* get phandle to MSI controller */
prop = (u32 *)fdt_getprop(blob, nodeoffset, "msi-parent", 0);
if (prop == NULL) {
debug("\n%s: ERROR: missing msi-parent: PCIe%d\n",
__func__, pcie->idx);
return;
}
phandle = fdt32_to_cpu(*prop);
/* set one msi-map row */
fdt_appendprop_u32(blob, nodeoffset, "msi-map", devid);
fdt_appendprop_u32(blob, nodeoffset, "msi-map", phandle);
fdt_appendprop_u32(blob, nodeoffset, "msi-map", streamid);
fdt_appendprop_u32(blob, nodeoffset, "msi-map", 1);
}
static void fdt_fixup_pcie(void *blob)
{
struct udevice *dev, *bus;
struct ls_pcie *pcie;
int streamid;
int index;
pci_dev_t bdf;
/* Scan all known buses */
for (pci_find_first_device(&dev);
dev;
pci_find_next_device(&dev)) {
for (bus = dev; device_is_on_pci_bus(bus);)
bus = bus->parent;
pcie = dev_get_priv(bus);
streamid = ls_pcie_next_streamid();
if (streamid < 0) {
debug("ERROR: no stream ids free\n");
continue;
}
index = ls_pcie_next_lut_index(pcie);
if (index < 0) {
debug("ERROR: no LUT indexes free\n");
continue;
}
/* the DT fixup must be relative to the hose first_busno */
bdf = dm_pci_get_bdf(dev) - PCI_BDF(bus->seq, 0, 0);
/* map PCI b.d.f to streamID in LUT */
ls_pcie_lut_set_mapping(pcie, index, bdf >> 8,
streamid);
/* update msi-map in device tree */
fdt_pcie_set_msi_map_entry(blob, pcie, bdf >> 8,
streamid);
}
}
#endif
static void ft_pcie_ls_setup(void *blob, struct ls_pcie *pcie)
{
int off;
off = fdt_node_offset_by_compat_reg(blob, "fsl,ls-pcie",
pcie->dbi_res.start);
if (off < 0) {
#ifdef CONFIG_FSL_PCIE_COMPAT /* Compatible with older version of dts node */
off = fdt_node_offset_by_compat_reg(blob,
CONFIG_FSL_PCIE_COMPAT,
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pcie->dbi_res.start);
if (off < 0)
return;
#else
return;
#endif
}
if (pcie->enabled)
fdt_set_node_status(blob, off, FDT_STATUS_OKAY, 0);
else
fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
}
/* Fixup Kernel DT for PCIe */
void ft_pci_setup(void *blob, bd_t *bd)
{
struct ls_pcie *pcie;
list_for_each_entry(pcie, &ls_pcie_list, list)
ft_pcie_ls_setup(blob, pcie);
#ifdef CONFIG_FSL_LSCH3
fdt_fixup_pcie(blob);
#endif
}
#else /* !CONFIG_OF_BOARD_SETUP */
void ft_pci_setup(void *blob, bd_t *bd)
{
}
#endif