From: Frank Li <Frank.Li@nxp.com>
To: helgaas@kernel.org
Cc: Frank.li@nxp.com, bhelgaas@google.com,
devicetree@vger.kernel.org, gustavo.pimentel@synopsys.com,
imx@lists.linux.dev, kw@linux.com, leoyang.li@nxp.com,
linux-arm-kernel@lists.infradead.org, linux-imx@nxp.com,
linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
lorenzo.pieralisi@arm.com, lpieralisi@kernel.org,
mani@kernel.org, manivannan.sadhasivam@linaro.org,
minghuan.lian@nxp.com, mingkai.hu@nxp.com, robh+dt@kernel.org,
roy.zang@nxp.com, shawnguo@kernel.org, zhiqiang.hou@nxp.com
Subject: [PATCH v11 3/3] PCI: layerscape: Add power management support for ls1028a
Date: Wed, 9 Aug 2023 11:35:40 -0400 [thread overview]
Message-ID: <20230809153540.834653-4-Frank.Li@nxp.com> (raw)
In-Reply-To: <20230809153540.834653-1-Frank.Li@nxp.com>
From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Add PME_Turn_off/PME_TO_Ack handshake sequence for ls1028a platform. Call
common dwc dw_pcie_suspend(resume)_noirq() function when system enter/exit
suspend state.
Acked-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
drivers/pci/controller/dwc/pci-layerscape.c | 130 ++++++++++++++++++--
1 file changed, 121 insertions(+), 9 deletions(-)
diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
index ed5fb492fe084..b49f654335fd7 100644
--- a/drivers/pci/controller/dwc/pci-layerscape.c
+++ b/drivers/pci/controller/dwc/pci-layerscape.c
@@ -8,9 +8,11 @@
* Author: Minghuan Lian <Minghuan.Lian@freescale.com>
*/
+#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/init.h>
+#include <linux/iopoll.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
@@ -20,6 +22,7 @@
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
+#include "../../pci.h"
#include "pcie-designware.h"
/* PEX Internal Configuration Registers */
@@ -27,12 +30,26 @@
#define PCIE_ABSERR 0x8d0 /* Bridge Slave Error Response Register */
#define PCIE_ABSERR_SETTING 0x9401 /* Forward error of non-posted request */
+/* PF Message Command Register */
+#define LS_PCIE_PF_MCR 0x2c
+#define PF_MCR_PTOMR BIT(0)
+#define PF_MCR_EXL2S BIT(1)
+
#define PCIE_IATU_NUM 6
+struct ls_pcie_drvdata {
+ const u32 pf_off;
+ bool pm_support;
+};
+
struct ls_pcie {
struct dw_pcie *pci;
+ const struct ls_pcie_drvdata *drvdata;
+ void __iomem *pf_base;
+ bool big_endian;
};
+#define ls_pcie_pf_readl_addr(addr) ls_pcie_pf_readl(pcie, addr)
#define to_ls_pcie(x) dev_get_drvdata((x)->dev)
static bool ls_pcie_is_bridge(struct ls_pcie *pcie)
@@ -73,6 +90,60 @@ static void ls_pcie_fix_error_response(struct ls_pcie *pcie)
iowrite32(PCIE_ABSERR_SETTING, pci->dbi_base + PCIE_ABSERR);
}
+static u32 ls_pcie_pf_readl(struct ls_pcie *pcie, u32 off)
+{
+ if (pcie->big_endian)
+ return ioread32be(pcie->pf_base + off);
+
+ return ioread32(pcie->pf_base + off);
+}
+
+static void ls_pcie_pf_writel(struct ls_pcie *pcie, u32 off, u32 val)
+{
+ if (pcie->big_endian)
+ iowrite32be(val, pcie->pf_base + off);
+ else
+ iowrite32(val, pcie->pf_base + off);
+}
+
+static void ls_pcie_send_turnoff_msg(struct dw_pcie_rp *pp)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+ struct ls_pcie *pcie = to_ls_pcie(pci);
+ u32 val;
+ int ret;
+
+ val = ls_pcie_pf_readl(pcie, LS_PCIE_PF_MCR);
+ val |= PF_MCR_PTOMR;
+ ls_pcie_pf_writel(pcie, LS_PCIE_PF_MCR, val);
+
+ ret = readx_poll_timeout(ls_pcie_pf_readl_addr, LS_PCIE_PF_MCR,
+ val, !(val & PF_MCR_PTOMR),
+ PCIE_PME_TO_L2_TIMEOUT_US/10,
+ PCIE_PME_TO_L2_TIMEOUT_US);
+ if (ret)
+ dev_err(pcie->pci->dev, "PME_Turn_off timeout\n");
+}
+
+static void ls_pcie_exit_from_l2(struct dw_pcie_rp *pp)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+ struct ls_pcie *pcie = to_ls_pcie(pci);
+ u32 val;
+ int ret;
+
+ val = ls_pcie_pf_readl(pcie, LS_PCIE_PF_MCR);
+ val |= PF_MCR_EXL2S;
+ ls_pcie_pf_writel(pcie, LS_PCIE_PF_MCR, val);
+
+ ret = readx_poll_timeout(ls_pcie_pf_readl_addr, LS_PCIE_PF_MCR,
+ val, !(val & PF_MCR_EXL2S),
+ PCIE_PME_TO_L2_TIMEOUT_US/10,
+ PCIE_PME_TO_L2_TIMEOUT_US);
+ if (ret)
+ dev_err(pcie->pci->dev, "L2 exit timeout\n");
+}
+
static int ls_pcie_host_init(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
@@ -91,18 +162,28 @@ static int ls_pcie_host_init(struct dw_pcie_rp *pp)
static const struct dw_pcie_host_ops ls_pcie_host_ops = {
.host_init = ls_pcie_host_init,
+ .pme_turn_off = ls_pcie_send_turnoff_msg,
+ .exit_from_l2 = ls_pcie_exit_from_l2,
+};
+
+static const struct ls_pcie_drvdata ls1021a_drvdata = {
+};
+
+static const struct ls_pcie_drvdata layerscape_drvdata = {
+ .pf_off = 0xc0000,
+ .pm_support = true,
};
static const struct of_device_id ls_pcie_of_match[] = {
- { .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", },
+ { .compatible = "fsl,ls1012a-pcie", .data = &layerscape_drvdata },
+ { .compatible = "fsl,ls1021a-pcie", .data = &ls1021a_drvdata },
+ { .compatible = "fsl,ls1028a-pcie", .data = &layerscape_drvdata },
+ { .compatible = "fsl,ls1043a-pcie", .data = &ls1021a_drvdata },
+ { .compatible = "fsl,ls1046a-pcie", .data = &layerscape_drvdata },
+ { .compatible = "fsl,ls2080a-pcie", .data = &layerscape_drvdata },
+ { .compatible = "fsl,ls2085a-pcie", .data = &layerscape_drvdata },
+ { .compatible = "fsl,ls2088a-pcie", .data = &layerscape_drvdata },
+ { .compatible = "fsl,ls1088a-pcie", .data = &layerscape_drvdata },
{ },
};
@@ -121,6 +202,8 @@ 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->pp.ops = &ls_pcie_host_ops;
@@ -131,6 +214,10 @@ static int ls_pcie_probe(struct platform_device *pdev)
if (IS_ERR(pci->dbi_base))
return PTR_ERR(pci->dbi_base);
+ pcie->big_endian = of_property_read_bool(dev->of_node, "big-endian");
+
+ pcie->pf_base = pci->dbi_base + pcie->drvdata->pf_off;
+
if (!ls_pcie_is_bridge(pcie))
return -ENODEV;
@@ -139,12 +226,37 @@ static int ls_pcie_probe(struct platform_device *pdev)
return dw_pcie_host_init(&pci->pp);
}
+static int ls_pcie_suspend_noirq(struct device *dev)
+{
+ struct ls_pcie *pcie = dev_get_drvdata(dev);
+
+ if (!pcie->drvdata->pm_support)
+ return 0;
+
+ return dw_pcie_suspend_noirq(pcie->pci);
+}
+
+static int ls_pcie_resume_noirq(struct device *dev)
+{
+ struct ls_pcie *pcie = dev_get_drvdata(dev);
+
+ if (!pcie->drvdata->pm_support)
+ return 0;
+
+ return dw_pcie_resume_noirq(pcie->pci);
+}
+
+static const struct dev_pm_ops ls_pcie_pm_ops = {
+ NOIRQ_SYSTEM_SLEEP_PM_OPS(ls_pcie_suspend_noirq, ls_pcie_resume_noirq)
+};
+
static struct platform_driver ls_pcie_driver = {
.probe = ls_pcie_probe,
.driver = {
.name = "layerscape-pcie",
.of_match_table = ls_pcie_of_match,
.suppress_bind_attrs = true,
+ .pm = &ls_pcie_pm_ops,
},
};
builtin_platform_driver(ls_pcie_driver);
--
2.34.1
next prev parent reply other threads:[~2023-08-09 15:37 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-09 15:35 [PATCH v11 resend 0/3] dwc general suspend/resume functionality Frank Li
2023-08-09 15:35 ` [PATCH v11 1/3] PCI: Add macro PCIE_PME_TO_L2_TIMEOUT_US Frank Li
2023-08-16 10:20 ` Lorenzo Pieralisi
2023-08-16 11:44 ` Bjorn Helgaas
2023-08-09 15:35 ` [PATCH v11 2/3] PCI: dwc: Implement general suspend/resume functionality for L2/L3 transitions Frank Li
2023-08-09 15:35 ` Frank Li [this message]
2023-08-16 15:30 ` [PATCH v11 3/3] PCI: layerscape: Add power management support for ls1028a Lorenzo Pieralisi
2023-08-17 22:42 ` Frank Li
2023-08-21 8:21 ` Lorenzo Pieralisi
2023-08-21 10:33 ` Manivannan Sadhasivam
2023-08-21 15:23 ` Frank Li
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230809153540.834653-4-Frank.Li@nxp.com \
--to=frank.li@nxp.com \
--cc=bhelgaas@google.com \
--cc=devicetree@vger.kernel.org \
--cc=gustavo.pimentel@synopsys.com \
--cc=helgaas@kernel.org \
--cc=imx@lists.linux.dev \
--cc=kw@linux.com \
--cc=leoyang.li@nxp.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-imx@nxp.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=lorenzo.pieralisi@arm.com \
--cc=lpieralisi@kernel.org \
--cc=mani@kernel.org \
--cc=manivannan.sadhasivam@linaro.org \
--cc=minghuan.lian@nxp.com \
--cc=mingkai.hu@nxp.com \
--cc=robh+dt@kernel.org \
--cc=roy.zang@nxp.com \
--cc=shawnguo@kernel.org \
--cc=zhiqiang.hou@nxp.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).