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PCI: layerscape: Change to use the DWC common link-up check function

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The current Layerscape PCIe driver directly uses the physical layer
LTSSM code to check the link-up state, which treats the > L0 states
as link-up. This is not correct, since there is not explicit map
between link-up state and LTSSM. So this patch changes to use the
DWC common link-up check function.

Link: https://lore.kernel.org/r/20211224094000.8513-1-Zhiqiang.Hou@nxp.com
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Hou Zhiqiang 2021-12-24 17:40:00 +08:00 committed by Lorenzo Pieralisi
parent 178e244cb6
commit d23f0c11ac
1 changed files with 11 additions and 141 deletions
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152
drivers/pci/controller/dwc/pci-layerscape.c
View file

@ -3,6 +3,7 @@
* PCIe host controller driver for Freescale Layerscape SoCs
*
* Copyright (C) 2014 Freescale Semiconductor.
* Copyright 2021 NXP
*
* Author: Minghuan Lian <Minghuan.Lian@freescale.com>
*/
@ -22,12 +23,6 @@
#include "pcie-designware.h"
/* PEX1/2 Misc Ports Status Register */
#define SCFG_PEXMSCPORTSR(pex_idx) (0x94 + (pex_idx) * 4)
#define LTSSM_STATE_SHIFT 20
#define LTSSM_STATE_MASK 0x3f
#define LTSSM_PCIE_L0 0x11 /* L0 state */
/* PEX Internal Configuration Registers */
#define PCIE_STRFMR1 0x71c /* Symbol Timer & Filter Mask Register1 */
#define PCIE_ABSERR 0x8d0 /* Bridge Slave Error Response Register */
@ -35,20 +30,8 @@
#define PCIE_IATU_NUM 6
struct ls_pcie_drvdata {
u32 lut_offset;
u32 ltssm_shift;
u32 lut_dbg;
const struct dw_pcie_host_ops *ops;
const struct dw_pcie_ops *dw_pcie_ops;
};
struct ls_pcie {
struct dw_pcie *pci;
void __iomem *lut;
struct regmap *scfg;
const struct ls_pcie_drvdata *drvdata;
int index;
};
#define to_ls_pcie(x) dev_get_drvdata((x)->dev)
@ -83,38 +66,6 @@ static void ls_pcie_drop_msg_tlp(struct ls_pcie *pcie)
iowrite32(val, pci->dbi_base + PCIE_STRFMR1);
}
static int ls1021_pcie_link_up(struct dw_pcie *pci)
{
u32 state;
struct ls_pcie *pcie = to_ls_pcie(pci);
if (!pcie->scfg)
return 0;
regmap_read(pcie->scfg, SCFG_PEXMSCPORTSR(pcie->index), &state);
state = (state >> LTSSM_STATE_SHIFT) & LTSSM_STATE_MASK;
if (state < LTSSM_PCIE_L0)
return 0;
return 1;
}
static int ls_pcie_link_up(struct dw_pcie *pci)
{
struct ls_pcie *pcie = to_ls_pcie(pci);
u32 state;
state = (ioread32(pcie->lut + pcie->drvdata->lut_dbg) >>
pcie->drvdata->ltssm_shift) &
LTSSM_STATE_MASK;
if (state < LTSSM_PCIE_L0)
return 0;
return 1;
}
/* Forward error response of outbound non-posted requests */
static void ls_pcie_fix_error_response(struct ls_pcie *pcie)
{
@ -139,96 +90,20 @@ static int ls_pcie_host_init(struct pcie_port *pp)
return 0;
}
static int ls1021_pcie_host_init(struct pcie_port *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct ls_pcie *pcie = to_ls_pcie(pci);
struct device *dev = pci->dev;
u32 index[2];
int ret;
pcie->scfg = syscon_regmap_lookup_by_phandle(dev->of_node,
"fsl,pcie-scfg");
if (IS_ERR(pcie->scfg)) {
ret = PTR_ERR(pcie->scfg);
dev_err(dev, "No syscfg phandle specified\n");
pcie->scfg = NULL;
return ret;
}
if (of_property_read_u32_array(dev->of_node,
"fsl,pcie-scfg", index, 2)) {
pcie->scfg = NULL;
return -EINVAL;
}
pcie->index = index[1];
return ls_pcie_host_init(pp);
}
static const struct dw_pcie_host_ops ls1021_pcie_host_ops = {
.host_init = ls1021_pcie_host_init,
};
static const struct dw_pcie_host_ops ls_pcie_host_ops = {
.host_init = ls_pcie_host_init,
};
static const struct dw_pcie_ops dw_ls1021_pcie_ops = {
.link_up = ls1021_pcie_link_up,
};
static const struct dw_pcie_ops dw_ls_pcie_ops = {
.link_up = ls_pcie_link_up,
};
static const struct ls_pcie_drvdata ls1021_drvdata = {
.ops = &ls1021_pcie_host_ops,
.dw_pcie_ops = &dw_ls1021_pcie_ops,
};
static const struct ls_pcie_drvdata ls1043_drvdata = {
.lut_offset = 0x10000,
.ltssm_shift = 24,
.lut_dbg = 0x7fc,
.ops = &ls_pcie_host_ops,
.dw_pcie_ops = &dw_ls_pcie_ops,
};
static const struct ls_pcie_drvdata ls1046_drvdata = {
.lut_offset = 0x80000,
.ltssm_shift = 24,
.lut_dbg = 0x407fc,
.ops = &ls_pcie_host_ops,
.dw_pcie_ops = &dw_ls_pcie_ops,
};
static const struct ls_pcie_drvdata ls2080_drvdata = {
.lut_offset = 0x80000,
.ltssm_shift = 0,
.lut_dbg = 0x7fc,
.ops = &ls_pcie_host_ops,
.dw_pcie_ops = &dw_ls_pcie_ops,
};
static const struct ls_pcie_drvdata ls2088_drvdata = {
.lut_offset = 0x80000,
.ltssm_shift = 0,
.lut_dbg = 0x407fc,
.ops = &ls_pcie_host_ops,
.dw_pcie_ops = &dw_ls_pcie_ops,
};
static const struct of_device_id ls_pcie_of_match[] = {
{ .compatible = "fsl,ls1012a-pcie", .data = &ls1046_drvdata },
{ .compatible = "fsl,ls1021a-pcie", .data = &ls1021_drvdata },
{ .compatible = "fsl,ls1028a-pcie", .data = &ls2088_drvdata },
{ .compatible = "fsl,ls1043a-pcie", .data = &ls1043_drvdata },
{ .compatible = "fsl,ls1046a-pcie", .data = &ls1046_drvdata },
{ .compatible = "fsl,ls2080a-pcie", .data = &ls2080_drvdata },
{ .compatible = "fsl,ls2085a-pcie", .data = &ls2080_drvdata },
{ .compatible = "fsl,ls2088a-pcie", .data = &ls2088_drvdata },
{ .compatible = "fsl,ls1088a-pcie", .data = &ls2088_drvdata },
{ .compatible = "fsl,ls1012a-pcie", },
{ .compatible = "fsl,ls1021a-pcie", },
{ .compatible = "fsl,ls1028a-pcie", },
{ .compatible = "fsl,ls1043a-pcie", },
{ .compatible = "fsl,ls1046a-pcie", },
{ .compatible = "fsl,ls2080a-pcie", },
{ .compatible = "fsl,ls2085a-pcie", },
{ .compatible = "fsl,ls2088a-pcie", },
{ .compatible = "fsl,ls1088a-pcie", },
{ },
};
@ -247,11 +122,8 @@ static int ls_pcie_probe(struct platform_device *pdev)
if (!pci)
return -ENOMEM;
pcie->drvdata = of_device_get_match_data(dev);
pci->dev = dev;
pci->ops = pcie->drvdata->dw_pcie_ops;
pci->pp.ops = pcie->drvdata->ops;
pci->pp.ops = &ls_pcie_host_ops;
pcie->pci = pci;
@ -260,8 +132,6 @@ static int ls_pcie_probe(struct platform_device *pdev)
if (IS_ERR(pci->dbi_base))
return PTR_ERR(pci->dbi_base);
pcie->lut = pci->dbi_base + pcie->drvdata->lut_offset;
if (!ls_pcie_is_bridge(pcie))
return -ENODEV;