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// SPDX-License-Identifier: GPL-2.0+ OR X11
/*
* Copyright 2018-2019 NXP
*
* PCIe Gen4 driver for NXP Layerscape SoCs
* Author: Hou Zhiqiang <Minder.Hou@gmail.com>
*
*/
#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 <linux/libfdt.h>
#include <fdt_support.h>
#ifdef CONFIG_ARM
#include <asm/arch/clock.h>
#endif
#include "pcie_layerscape_gen4.h"
#if defined(CONFIG_FSL_LSCH3) || defined(CONFIG_FSL_LSCH2)
/*
* Return next available LUT index.
*/
static int ls_pcie_g4_next_lut_index(struct ls_pcie_g4 *pcie)
{
if (pcie->next_lut_index < PCIE_LUT_ENTRY_COUNT)
return pcie->next_lut_index++;
return -ENOSPC; /* LUT is full */
}
/* returns the next available streamid for pcie, -errno if failed */
static int ls_pcie_g4_next_streamid(struct ls_pcie_g4 *pcie)
{
int stream_id = pcie->stream_id_cur;
if (stream_id > FSL_PEX_STREAM_ID_NUM)
return -EINVAL;
pcie->stream_id_cur++;
return stream_id | ((pcie->idx + 1) << 11);
}
/*
* Program a single LUT entry
*/
static void ls_pcie_g4_lut_set_mapping(struct ls_pcie_g4 *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_g4 *pcie,
u32 devid, u32 streamid)
{
u32 *prop;
u32 phandle;
int nodeoff;
#ifdef CONFIG_FSL_PCIE_COMPAT
nodeoff = fdt_node_offset_by_compat_reg(blob, CONFIG_FSL_PCIE_COMPAT,
pcie->ccsr_res.start);
#else
#error "No CONFIG_FSL_PCIE_COMPAT defined"
#endif
if (nodeoff < 0) {
debug("%s: ERROR: failed to find pcie compatiable\n", __func__);
return;
}
/* get phandle to MSI controller */
prop = (u32 *)fdt_getprop(blob, nodeoff, "msi-parent", 0);
if (!prop) {
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, nodeoff, "msi-map", devid);
fdt_appendprop_u32(blob, nodeoff, "msi-map", phandle);
fdt_appendprop_u32(blob, nodeoff, "msi-map", streamid);
fdt_appendprop_u32(blob, nodeoff, "msi-map", 1);
}
/*
* An iommu-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.:
*
* iommu-map = <[devid] [phandle-to-iommu-ctrl] [stream-id] [count]
* [devid] [phandle-to-iommu-ctrl] [stream-id] [count]>;
*/
static void fdt_pcie_set_iommu_map_entry(void *blob, struct ls_pcie_g4 *pcie,
u32 devid, u32 streamid)
{
u32 *prop;
u32 iommu_map[4];
int nodeoff;
int lenp;
#ifdef CONFIG_FSL_PCIE_COMPAT
nodeoff = fdt_node_offset_by_compat_reg(blob, CONFIG_FSL_PCIE_COMPAT,
pcie->ccsr_res.start);
#else
#error "No CONFIG_FSL_PCIE_COMPAT defined"
#endif
if (nodeoff < 0) {
debug("%s: ERROR: failed to find pcie compatiable\n", __func__);
return;
}
/* get phandle to iommu controller */
prop = fdt_getprop_w(blob, nodeoff, "iommu-map", &lenp);
if (!prop) {
debug("\n%s: ERROR: missing iommu-map: PCIe%d\n",
__func__, pcie->idx);
return;
}
/* set iommu-map row */
iommu_map[0] = cpu_to_fdt32(devid);
iommu_map[1] = *++prop;
iommu_map[2] = cpu_to_fdt32(streamid);
iommu_map[3] = cpu_to_fdt32(1);
if (devid == 0)
fdt_setprop_inplace(blob, nodeoff, "iommu-map", iommu_map, 16);
else
fdt_appendprop(blob, nodeoff, "iommu-map", iommu_map, 16);
}
static void fdt_fixup_pcie(void *blob)
{
struct udevice *dev, *bus;
struct ls_pcie_g4 *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_g4_next_streamid(pcie);
if (streamid < 0) {
debug("ERROR: no stream ids free\n");
continue;
}
index = ls_pcie_g4_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_g4_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);
/* update iommu-map in device tree */
fdt_pcie_set_iommu_map_entry(blob, pcie, bdf >> 8, streamid);
}
}
#endif
static void ft_pcie_ep_layerscape_gen4_fix(void *blob, struct ls_pcie_g4 *pcie)
{
int off;
off = fdt_node_offset_by_compat_reg(blob, "fsl,lx2160a-pcie-ep",
pcie->ccsr_res.start);
if (off < 0) {
debug("%s: ERROR: failed to find pcie compatiable\n",
__func__);
return;
}
if (pcie->enabled && pcie->mode == PCI_HEADER_TYPE_NORMAL)
fdt_set_node_status(blob, off, FDT_STATUS_OKAY, 0);
else
fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
}
static void ft_pcie_rc_layerscape_gen4_fix(void *blob, struct ls_pcie_g4 *pcie)
{
int off;
#ifdef CONFIG_FSL_PCIE_COMPAT
off = fdt_node_offset_by_compat_reg(blob, CONFIG_FSL_PCIE_COMPAT,
pcie->ccsr_res.start);
#else
#error "No CONFIG_FSL_PCIE_COMPAT defined"
#endif
if (off < 0) {
debug("%s: ERROR: failed to find pcie compatiable\n", __func__);
return;
}
if (pcie->enabled && pcie->mode == PCI_HEADER_TYPE_BRIDGE)
fdt_set_node_status(blob, off, FDT_STATUS_OKAY, 0);
else
fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
}
static void ft_pcie_layerscape_gen4_setup(void *blob, struct ls_pcie_g4 *pcie)
{
ft_pcie_rc_layerscape_gen4_fix(blob, pcie);
ft_pcie_ep_layerscape_gen4_fix(blob, pcie);
}
/* Fixup Kernel DT for PCIe */
void ft_pci_setup(void *blob, bd_t *bd)
{
struct ls_pcie_g4 *pcie;
list_for_each_entry(pcie, &ls_pcie_g4_list, list)
ft_pcie_layerscape_gen4_setup(blob, pcie);
#if defined(CONFIG_FSL_LSCH3) || defined(CONFIG_FSL_LSCH2)
fdt_fixup_pcie(blob);
#endif
}
#else /* !CONFIG_OF_BOARD_SETUP */
void ft_pci_setup(void *blob, bd_t *bd)
{
}
#endif
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