From: Hou Zhiqiang <[email protected]>
Add PME_Turn_Off/PME_TO_Ack handshake sequence, and finally
put the PCIe controller into D3 state after the L2/L3 ready
state transition process completion.
Signed-off-by: Hou Zhiqiang <[email protected]>
---
drivers/pci/controller/dwc/pci-layerscape.c | 384 ++++++++++++++++++-
drivers/pci/controller/dwc/pcie-designware.h | 1 +
2 files changed, 383 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
index be404c16bcbe..ca9ea07f77c1 100644
--- a/drivers/pci/controller/dwc/pci-layerscape.c
+++ b/drivers/pci/controller/dwc/pci-layerscape.c
@@ -3,13 +3,16 @@
* PCIe host controller driver for Freescale Layerscape SoCs
*
* Copyright (C) 2014 Freescale Semiconductor.
+ * Copyright 2020 NXP
*
* Author: Minghuan Lian <[email protected]>
*/
+#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_irq.h>
@@ -27,17 +30,66 @@
#define PCIE_ABSERR 0x8d0 /* Bridge Slave Error Response Register */
#define PCIE_ABSERR_SETTING 0x9401 /* Forward error of non-posted request */
+#define PCIE_PM_SCR 0x44
+#define PCIE_PM_SCR_PMEPS_D0 0x0
+#define PCIE_PM_SCR_PMEPS_D3 0x3
+
+#define PCIE_LNKCTL 0x80 /* PCIe link ctrl Register */
+
+/* PF Message Command Register */
+#define LS_PCIE_PF_MCR 0x2c
+#define PF_MCR_PTOMR BIT(0)
+#define PF_MCR_EXL2S BIT(1)
+
+/* LS1021A PEXn PM Write Control Register */
+#define SCFG_PEXPMWRCR(idx) (0x5c + (idx) * 0x64)
+#define PMXMTTURNOFF BIT(31)
+#define SCFG_PEXSFTRSTCR 0x190
+#define PEXSR(idx) BIT(idx)
+
+/* LS1043A PEX PME control register */
+#define SCFG_PEXPMECR 0x144
+#define PEXPME(idx) BIT(31 - (idx) * 4)
+
+/* LS1043A PEX LUT debug register */
+#define LS_PCIE_LDBG 0x7fc
+#define LDBG_SR BIT(30)
+#define LDBG_WE BIT(31)
+
#define PCIE_IATU_NUM 6
+#define LS_PCIE_IS_L2(v) \
+ (((v) & PORT_LOGIC_LTSSM_STATE_MASK) == PORT_LOGIC_LTSSM_STATE_L2)
+
+struct ls_pcie;
+
+struct ls_pcie_host_pm_ops {
+ int (*pm_init)(struct ls_pcie *pcie);
+ void (*send_turn_off_message)(struct ls_pcie *pcie);
+ void (*exit_from_l2)(struct ls_pcie *pcie);
+};
+
struct ls_pcie_drvdata {
+ const u32 pf_off;
+ const u32 lut_off;
const struct dw_pcie_host_ops *ops;
+ const struct ls_pcie_host_pm_ops *pm_ops;
};
struct ls_pcie {
struct dw_pcie *pci;
const struct ls_pcie_drvdata *drvdata;
+ void __iomem *pf_base;
+ void __iomem *lut_base;
+ bool big_endian;
+ bool ep_presence;
+ bool pm_support;
+ struct regmap *scfg;
+ int index;
};
+#define ls_pcie_lut_readl_addr(addr) ls_pcie_lut_readl(pcie, addr)
+#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)
@@ -86,6 +138,208 @@ static void ls_pcie_fix_error_response(struct ls_pcie *pcie)
iowrite32(PCIE_ABSERR_SETTING, pci->dbi_base + PCIE_ABSERR);
}
+static u32 ls_pcie_lut_readl(struct ls_pcie *pcie, u32 off)
+{
+ if (pcie->big_endian)
+ return ioread32be(pcie->lut_base + off);
+
+ return ioread32(pcie->lut_base + off);
+}
+
+static void ls_pcie_lut_writel(struct ls_pcie *pcie, u32 off, u32 val)
+{
+ if (pcie->big_endian)
+ return iowrite32be(val, pcie->lut_base + off);
+
+ return iowrite32(val, pcie->lut_base + off);
+
+}
+
+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)
+ return iowrite32be(val, pcie->pf_base + off);
+
+ return iowrite32(val, pcie->pf_base + off);
+
+}
+
+static void ls_pcie_send_turnoff_msg(struct ls_pcie *pcie)
+{
+ 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), 100, 10000);
+ if (ret)
+ dev_info(pcie->pci->dev, "poll turn off message timeout\n");
+}
+
+static void ls1021a_pcie_send_turnoff_msg(struct ls_pcie *pcie)
+{
+ u32 val;
+
+ if (!pcie->scfg) {
+ dev_dbg(pcie->pci->dev, "SYSCFG is NULL\n");
+ return;
+ }
+
+ /* Send Turn_off message */
+ regmap_read(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), &val);
+ val |= PMXMTTURNOFF;
+ regmap_write(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), val);
+
+ mdelay(10);
+
+ /* Clear Turn_off message */
+ regmap_read(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), &val);
+ val &= ~PMXMTTURNOFF;
+ regmap_write(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), val);
+}
+
+static void ls1043a_pcie_send_turnoff_msg(struct ls_pcie *pcie)
+{
+ u32 val;
+
+ if (!pcie->scfg) {
+ dev_dbg(pcie->pci->dev, "SYSCFG is NULL\n");
+ return;
+ }
+
+ /* Send Turn_off message */
+ regmap_read(pcie->scfg, SCFG_PEXPMECR, &val);
+ val |= PEXPME(pcie->index);
+ regmap_write(pcie->scfg, SCFG_PEXPMECR, val);
+
+ mdelay(10);
+
+ /* Clear Turn_off message */
+ regmap_read(pcie->scfg, SCFG_PEXPMECR, &val);
+ val &= ~PEXPME(pcie->index);
+ regmap_write(pcie->scfg, SCFG_PEXPMECR, val);
+}
+
+static void ls_pcie_exit_from_l2(struct ls_pcie *pcie)
+{
+ 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), 100, 10000);
+ if (ret)
+ dev_info(pcie->pci->dev, "poll exit L2 state timeout\n");
+}
+
+static void ls_pcie_retrain_link(struct ls_pcie *pcie)
+{
+ struct dw_pcie *pci = pcie->pci;
+ u32 val;
+
+ val = dw_pcie_readw_dbi(pci, PCIE_LNKCTL);
+ val |= PCI_EXP_LNKCTL_RL;
+ dw_pcie_writew_dbi(pci, PCIE_LNKCTL, val);
+}
+
+static void ls1021a_pcie_exit_from_l2(struct ls_pcie *pcie)
+{
+ u32 val;
+
+ regmap_read(pcie->scfg, SCFG_PEXSFTRSTCR, &val);
+ val |= PEXSR(pcie->index);
+ regmap_write(pcie->scfg, SCFG_PEXSFTRSTCR, val);
+
+ regmap_read(pcie->scfg, SCFG_PEXSFTRSTCR, &val);
+ val &= ~PEXSR(pcie->index);
+ regmap_write(pcie->scfg, SCFG_PEXSFTRSTCR, val);
+
+ mdelay(1);
+
+ ls_pcie_retrain_link(pcie);
+}
+static void ls1043a_pcie_exit_from_l2(struct ls_pcie *pcie)
+{
+ u32 val;
+
+ val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
+ val |= LDBG_WE;
+ ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
+
+ val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
+ val |= LDBG_SR;
+ ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
+
+ val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
+ val &= ~LDBG_SR;
+ ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
+
+ val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
+ val &= ~LDBG_WE;
+ ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
+
+ mdelay(1);
+
+ ls_pcie_retrain_link(pcie);
+}
+
+static int ls1021a_pcie_pm_init(struct ls_pcie *pcie)
+{
+ struct device *dev = pcie->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;
+ }
+
+ ret = of_property_read_u32_array(dev->of_node, "fsl,pcie-scfg",
+ index, 2);
+ if (ret) {
+ pcie->scfg = NULL;
+ return ret;
+ }
+
+ pcie->index = index[1];
+
+ return 0;
+}
+
+static int ls_pcie_pm_init(struct ls_pcie *pcie)
+{
+ return 0;
+}
+
+static void ls_pcie_set_dstate(struct ls_pcie *pcie, u32 dstate)
+{
+ struct dw_pcie *pci = pcie->pci;
+ u32 val;
+
+ val = dw_pcie_readw_dbi(pci, PCIE_PM_SCR);
+ val &= ~PCI_PM_CTRL_STATE_MASK;
+ val |= dstate;
+ dw_pcie_writew_dbi(pci, PCIE_PM_SCR, val);
+}
+
static int ls_pcie_host_init(struct pcie_port *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
@@ -133,20 +387,52 @@ static int ls_pcie_msi_host_init(struct pcie_port *pp)
return 0;
}
+static struct ls_pcie_host_pm_ops ls1021a_pcie_host_pm_ops = {
+ .pm_init = &ls1021a_pcie_pm_init,
+ .send_turn_off_message = &ls1021a_pcie_send_turnoff_msg,
+ .exit_from_l2 = &ls1021a_pcie_exit_from_l2,
+};
+
+static struct ls_pcie_host_pm_ops ls1043a_pcie_host_pm_ops = {
+ .pm_init = &ls1021a_pcie_pm_init,
+ .send_turn_off_message = &ls1043a_pcie_send_turnoff_msg,
+ .exit_from_l2 = &ls1043a_pcie_exit_from_l2,
+};
+
+static struct ls_pcie_host_pm_ops ls_pcie_host_pm_ops = {
+ .pm_init = &ls_pcie_pm_init,
+ .send_turn_off_message = &ls_pcie_send_turnoff_msg,
+ .exit_from_l2 = &ls_pcie_exit_from_l2,
+};
+
static const struct dw_pcie_host_ops ls_pcie_host_ops = {
.host_init = ls_pcie_host_init,
.msi_host_init = ls_pcie_msi_host_init,
};
+static const struct ls_pcie_drvdata ls1021a_drvdata = {
+ .ops = &ls_pcie_host_ops,
+ .pm_ops = &ls1021a_pcie_host_pm_ops,
+};
+
+static const struct ls_pcie_drvdata ls1043a_drvdata = {
+ .ops = &ls_pcie_host_ops,
+ .lut_off = 0x10000,
+ .pm_ops = &ls1043a_pcie_host_pm_ops,
+};
+
static const struct ls_pcie_drvdata layerscape_drvdata = {
.ops = &ls_pcie_host_ops,
+ .lut_off = 0x80000,
+ .pf_off = 0xc0000,
+ .pm_ops = &ls_pcie_host_pm_ops,
};
static const struct of_device_id ls_pcie_of_match[] = {
{ .compatible = "fsl,ls1012a-pcie", .data = &layerscape_drvdata },
- { .compatible = "fsl,ls1021a-pcie", .data = &layerscape_drvdata },
+ { .compatible = "fsl,ls1021a-pcie", .data = &ls1021a_drvdata },
{ .compatible = "fsl,ls1028a-pcie", .data = &layerscape_drvdata },
- { .compatible = "fsl,ls1043a-pcie", .data = &layerscape_drvdata },
+ { .compatible = "fsl,ls1043a-pcie", .data = &ls1043a_drvdata },
{ .compatible = "fsl,ls1046a-pcie", .data = &layerscape_drvdata },
{ .compatible = "fsl,ls2080a-pcie", .data = &layerscape_drvdata },
{ .compatible = "fsl,ls2085a-pcie", .data = &layerscape_drvdata },
@@ -170,6 +456,15 @@ static int __init ls_add_pcie_port(struct ls_pcie *pcie)
return ret;
}
+ if (dw_pcie_link_up(pci)) {
+ dev_dbg(pci->dev, "Endpoint is present\n");
+ pcie->ep_presence = true;
+ }
+
+ if (pcie->drvdata->pm_ops && pcie->drvdata->pm_ops->pm_init &&
+ !pcie->drvdata->pm_ops->pm_init(pcie))
+ pcie->pm_support = true;
+
return 0;
}
@@ -200,6 +495,14 @@ static int __init 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");
+
+ if (pcie->drvdata->lut_off)
+ pcie->lut_base = pci->dbi_base + pcie->drvdata->lut_off;
+
+ if (pcie->drvdata->pf_off)
+ pcie->pf_base = pci->dbi_base + pcie->drvdata->pf_off;
+
if (!ls_pcie_is_bridge(pcie))
return -ENODEV;
@@ -212,11 +515,88 @@ static int __init ls_pcie_probe(struct platform_device *pdev)
return 0;
}
+static bool ls_pcie_pm_check(struct ls_pcie *pcie)
+{
+ if (!pcie->ep_presence) {
+ dev_dbg(pcie->pci->dev, "Endpoint isn't present\n");
+ return false;
+ }
+
+ if (!pcie->pm_support)
+ return false;
+
+ return true;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ls_pcie_suspend_noirq(struct device *dev)
+{
+ struct ls_pcie *pcie = dev_get_drvdata(dev);
+ struct dw_pcie *pci = pcie->pci;
+ u32 val;
+ int ret;
+
+ if (!ls_pcie_pm_check(pcie))
+ return 0;
+
+ pcie->drvdata->pm_ops->send_turn_off_message(pcie);
+
+ /* 10ms timeout to check L2 ready */
+ ret = readl_poll_timeout(pci->dbi_base + PCIE_PORT_DEBUG0,
+ val, LS_PCIE_IS_L2(val), 100, 10000);
+ if (ret) {
+ dev_err(dev, "PCIe link enter L2 timeout! ltssm = 0x%x\n", val);
+ return ret;
+ }
+
+ ls_pcie_set_dstate(pcie, PCIE_PM_SCR_PMEPS_D3);
+
+ return 0;
+}
+
+static int ls_pcie_resume_noirq(struct device *dev)
+{
+ struct ls_pcie *pcie = dev_get_drvdata(dev);
+ struct dw_pcie *pci = pcie->pci;
+ int ret;
+
+ if (!ls_pcie_pm_check(pcie))
+ return 0;
+
+ ls_pcie_set_dstate(pcie, PCIE_PM_SCR_PMEPS_D0);
+
+ pcie->drvdata->pm_ops->exit_from_l2(pcie);
+
+ /* delay 10ms to access EP */
+ mdelay(10);
+
+ ret = ls_pcie_host_init(&pci->pp);
+ if (ret) {
+ dev_err(dev, "ls_pcie_host_init failed! ret = 0x%x\n", ret);
+ return ret;
+ }
+
+ ret = dw_pcie_wait_for_link(pci);
+ if (ret) {
+ dev_err(dev, "wait link up timeout! ret = 0x%x\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops ls_pcie_pm_ops = {
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(ls_pcie_suspend_noirq,
+ ls_pcie_resume_noirq)
+};
+
static struct platform_driver ls_pcie_driver = {
.driver = {
.name = "layerscape-pcie",
.of_match_table = ls_pcie_of_match,
.suppress_bind_attrs = true,
+ .pm = &ls_pcie_pm_ops,
},
};
builtin_platform_driver_probe(ls_pcie_driver, ls_pcie_probe);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index f911760dcc69..1f2fd03d1eba 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -46,6 +46,7 @@
#define PCIE_PORT_DEBUG0 0x728
#define PORT_LOGIC_LTSSM_STATE_MASK 0x1f
#define PORT_LOGIC_LTSSM_STATE_L0 0x11
+#define PORT_LOGIC_LTSSM_STATE_L2 0x15
#define PCIE_PORT_DEBUG1 0x72C
#define PCIE_PORT_DEBUG1_LINK_UP BIT(4)
#define PCIE_PORT_DEBUG1_LINK_IN_TRAINING BIT(29)
--
2.17.1
On Mon, Sep 07, 2020 at 01:38:01PM +0800, Zhiqiang Hou wrote:
> From: Hou Zhiqiang <[email protected]>
>
> Add PME_Turn_Off/PME_TO_Ack handshake sequence, and finally
> put the PCIe controller into D3 state after the L2/L3 ready
> state transition process completion.
>
> Signed-off-by: Hou Zhiqiang <[email protected]>
> ---
> drivers/pci/controller/dwc/pci-layerscape.c | 384 ++++++++++++++++++-
> drivers/pci/controller/dwc/pcie-designware.h | 1 +
> 2 files changed, 383 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
> index be404c16bcbe..ca9ea07f77c1 100644
> --- a/drivers/pci/controller/dwc/pci-layerscape.c
> +++ b/drivers/pci/controller/dwc/pci-layerscape.c
> @@ -3,13 +3,16 @@
> * PCIe host controller driver for Freescale Layerscape SoCs
> *
> * Copyright (C) 2014 Freescale Semiconductor.
> + * Copyright 2020 NXP
> *
> * Author: Minghuan Lian <[email protected]>
> */
>
> +#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_irq.h>
> @@ -27,17 +30,66 @@
> #define PCIE_ABSERR 0x8d0 /* Bridge Slave Error Response Register */
> #define PCIE_ABSERR_SETTING 0x9401 /* Forward error of non-posted request */
>
> +#define PCIE_PM_SCR 0x44
> +#define PCIE_PM_SCR_PMEPS_D0 0x0
> +#define PCIE_PM_SCR_PMEPS_D3 0x3
> +
> +#define PCIE_LNKCTL 0x80 /* PCIe link ctrl Register */
Use the common defines.
> +
> +/* PF Message Command Register */
> +#define LS_PCIE_PF_MCR 0x2c
> +#define PF_MCR_PTOMR BIT(0)
> +#define PF_MCR_EXL2S BIT(1)
> +
> +/* LS1021A PEXn PM Write Control Register */
> +#define SCFG_PEXPMWRCR(idx) (0x5c + (idx) * 0x64)
> +#define PMXMTTURNOFF BIT(31)
> +#define SCFG_PEXSFTRSTCR 0x190
> +#define PEXSR(idx) BIT(idx)
> +
> +/* LS1043A PEX PME control register */
> +#define SCFG_PEXPMECR 0x144
> +#define PEXPME(idx) BIT(31 - (idx) * 4)
> +
> +/* LS1043A PEX LUT debug register */
> +#define LS_PCIE_LDBG 0x7fc
> +#define LDBG_SR BIT(30)
> +#define LDBG_WE BIT(31)
> +
> #define PCIE_IATU_NUM 6
>
> +#define LS_PCIE_IS_L2(v) \
> + (((v) & PORT_LOGIC_LTSSM_STATE_MASK) == PORT_LOGIC_LTSSM_STATE_L2)
> +
> +struct ls_pcie;
> +
> +struct ls_pcie_host_pm_ops {
> + int (*pm_init)(struct ls_pcie *pcie);
> + void (*send_turn_off_message)(struct ls_pcie *pcie);
> + void (*exit_from_l2)(struct ls_pcie *pcie);
> +};
> +
> struct ls_pcie_drvdata {
> + const u32 pf_off;
> + const u32 lut_off;
> const struct dw_pcie_host_ops *ops;
> + const struct ls_pcie_host_pm_ops *pm_ops;
> };
>
> struct ls_pcie {
> struct dw_pcie *pci;
> const struct ls_pcie_drvdata *drvdata;
> + void __iomem *pf_base;
> + void __iomem *lut_base;
> + bool big_endian;
> + bool ep_presence;
> + bool pm_support;
> + struct regmap *scfg;
> + int index;
> };
>
> +#define ls_pcie_lut_readl_addr(addr) ls_pcie_lut_readl(pcie, addr)
> +#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)
> @@ -86,6 +138,208 @@ static void ls_pcie_fix_error_response(struct ls_pcie *pcie)
> iowrite32(PCIE_ABSERR_SETTING, pci->dbi_base + PCIE_ABSERR);
> }
>
> +static u32 ls_pcie_lut_readl(struct ls_pcie *pcie, u32 off)
> +{
> + if (pcie->big_endian)
> + return ioread32be(pcie->lut_base + off);
> +
> + return ioread32(pcie->lut_base + off);
> +}
> +
> +static void ls_pcie_lut_writel(struct ls_pcie *pcie, u32 off, u32 val)
> +{
> + if (pcie->big_endian)
> + return iowrite32be(val, pcie->lut_base + off);
> +
> + return iowrite32(val, pcie->lut_base + off);
> +
> +}
> +
> +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)
> + return iowrite32be(val, pcie->pf_base + off);
> +
> + return iowrite32(val, pcie->pf_base + off);
> +
> +}
> +
> +static void ls_pcie_send_turnoff_msg(struct ls_pcie *pcie)
> +{
> + 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), 100, 10000);
> + if (ret)
> + dev_info(pcie->pci->dev, "poll turn off message timeout\n");
> +}
> +
> +static void ls1021a_pcie_send_turnoff_msg(struct ls_pcie *pcie)
> +{
> + u32 val;
> +
> + if (!pcie->scfg) {
> + dev_dbg(pcie->pci->dev, "SYSCFG is NULL\n");
> + return;
> + }
> +
> + /* Send Turn_off message */
> + regmap_read(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), &val);
> + val |= PMXMTTURNOFF;
> + regmap_write(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), val);
> +
> + mdelay(10);
> +
> + /* Clear Turn_off message */
> + regmap_read(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), &val);
> + val &= ~PMXMTTURNOFF;
> + regmap_write(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), val);
> +}
> +
> +static void ls1043a_pcie_send_turnoff_msg(struct ls_pcie *pcie)
> +{
> + u32 val;
> +
> + if (!pcie->scfg) {
> + dev_dbg(pcie->pci->dev, "SYSCFG is NULL\n");
> + return;
> + }
> +
> + /* Send Turn_off message */
> + regmap_read(pcie->scfg, SCFG_PEXPMECR, &val);
> + val |= PEXPME(pcie->index);
> + regmap_write(pcie->scfg, SCFG_PEXPMECR, val);
> +
> + mdelay(10);
> +
> + /* Clear Turn_off message */
> + regmap_read(pcie->scfg, SCFG_PEXPMECR, &val);
> + val &= ~PEXPME(pcie->index);
> + regmap_write(pcie->scfg, SCFG_PEXPMECR, val);
> +}
> +
> +static void ls_pcie_exit_from_l2(struct ls_pcie *pcie)
> +{
> + 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), 100, 10000);
> + if (ret)
> + dev_info(pcie->pci->dev, "poll exit L2 state timeout\n");
> +}
> +
> +static void ls_pcie_retrain_link(struct ls_pcie *pcie)
> +{
> + struct dw_pcie *pci = pcie->pci;
> + u32 val;
> +
> + val = dw_pcie_readw_dbi(pci, PCIE_LNKCTL);
> + val |= PCI_EXP_LNKCTL_RL;
> + dw_pcie_writew_dbi(pci, PCIE_LNKCTL, val);
> +}
> +
> +static void ls1021a_pcie_exit_from_l2(struct ls_pcie *pcie)
> +{
> + u32 val;
> +
> + regmap_read(pcie->scfg, SCFG_PEXSFTRSTCR, &val);
> + val |= PEXSR(pcie->index);
> + regmap_write(pcie->scfg, SCFG_PEXSFTRSTCR, val);
> +
> + regmap_read(pcie->scfg, SCFG_PEXSFTRSTCR, &val);
> + val &= ~PEXSR(pcie->index);
> + regmap_write(pcie->scfg, SCFG_PEXSFTRSTCR, val);
> +
> + mdelay(1);
> +
> + ls_pcie_retrain_link(pcie);
> +}
> +static void ls1043a_pcie_exit_from_l2(struct ls_pcie *pcie)
> +{
> + u32 val;
> +
> + val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
> + val |= LDBG_WE;
> + ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
> +
> + val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
> + val |= LDBG_SR;
> + ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
> +
> + val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
> + val &= ~LDBG_SR;
> + ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
> +
> + val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
> + val &= ~LDBG_WE;
> + ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
> +
> + mdelay(1);
> +
> + ls_pcie_retrain_link(pcie);
> +}
> +
> +static int ls1021a_pcie_pm_init(struct ls_pcie *pcie)
> +{
> + struct device *dev = pcie->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;
> + }
> +
> + ret = of_property_read_u32_array(dev->of_node, "fsl,pcie-scfg",
> + index, 2);
> + if (ret) {
> + pcie->scfg = NULL;
> + return ret;
> + }
> +
> + pcie->index = index[1];
> +
> + return 0;
> +}
> +
> +static int ls_pcie_pm_init(struct ls_pcie *pcie)
> +{
> + return 0;
> +}
> +
> +static void ls_pcie_set_dstate(struct ls_pcie *pcie, u32 dstate)
> +{
> + struct dw_pcie *pci = pcie->pci;
> + u32 val;
> +
> + val = dw_pcie_readw_dbi(pci, PCIE_PM_SCR);
> + val &= ~PCI_PM_CTRL_STATE_MASK;
> + val |= dstate;
> + dw_pcie_writew_dbi(pci, PCIE_PM_SCR, val);
> +}
> +
> static int ls_pcie_host_init(struct pcie_port *pp)
> {
> struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> @@ -133,20 +387,52 @@ static int ls_pcie_msi_host_init(struct pcie_port *pp)
> return 0;
> }
>
> +static struct ls_pcie_host_pm_ops ls1021a_pcie_host_pm_ops = {
> + .pm_init = &ls1021a_pcie_pm_init,
> + .send_turn_off_message = &ls1021a_pcie_send_turnoff_msg,
> + .exit_from_l2 = &ls1021a_pcie_exit_from_l2,
> +};
> +
> +static struct ls_pcie_host_pm_ops ls1043a_pcie_host_pm_ops = {
> + .pm_init = &ls1021a_pcie_pm_init,
> + .send_turn_off_message = &ls1043a_pcie_send_turnoff_msg,
> + .exit_from_l2 = &ls1043a_pcie_exit_from_l2,
> +};
> +
> +static struct ls_pcie_host_pm_ops ls_pcie_host_pm_ops = {
> + .pm_init = &ls_pcie_pm_init,
> + .send_turn_off_message = &ls_pcie_send_turnoff_msg,
> + .exit_from_l2 = &ls_pcie_exit_from_l2,
> +};
> +
> static const struct dw_pcie_host_ops ls_pcie_host_ops = {
> .host_init = ls_pcie_host_init,
> .msi_host_init = ls_pcie_msi_host_init,
> };
>
> +static const struct ls_pcie_drvdata ls1021a_drvdata = {
> + .ops = &ls_pcie_host_ops,
> + .pm_ops = &ls1021a_pcie_host_pm_ops,
> +};
> +
> +static const struct ls_pcie_drvdata ls1043a_drvdata = {
> + .ops = &ls_pcie_host_ops,
> + .lut_off = 0x10000,
> + .pm_ops = &ls1043a_pcie_host_pm_ops,
> +};
> +
> static const struct ls_pcie_drvdata layerscape_drvdata = {
> .ops = &ls_pcie_host_ops,
> + .lut_off = 0x80000,
> + .pf_off = 0xc0000,
> + .pm_ops = &ls_pcie_host_pm_ops,
> };
>
> static const struct of_device_id ls_pcie_of_match[] = {
> { .compatible = "fsl,ls1012a-pcie", .data = &layerscape_drvdata },
> - { .compatible = "fsl,ls1021a-pcie", .data = &layerscape_drvdata },
> + { .compatible = "fsl,ls1021a-pcie", .data = &ls1021a_drvdata },
> { .compatible = "fsl,ls1028a-pcie", .data = &layerscape_drvdata },
> - { .compatible = "fsl,ls1043a-pcie", .data = &layerscape_drvdata },
> + { .compatible = "fsl,ls1043a-pcie", .data = &ls1043a_drvdata },
> { .compatible = "fsl,ls1046a-pcie", .data = &layerscape_drvdata },
> { .compatible = "fsl,ls2080a-pcie", .data = &layerscape_drvdata },
> { .compatible = "fsl,ls2085a-pcie", .data = &layerscape_drvdata },
> @@ -170,6 +456,15 @@ static int __init ls_add_pcie_port(struct ls_pcie *pcie)
> return ret;
> }
>
> + if (dw_pcie_link_up(pci)) {
> + dev_dbg(pci->dev, "Endpoint is present\n");
> + pcie->ep_presence = true;
> + }
> +
> + if (pcie->drvdata->pm_ops && pcie->drvdata->pm_ops->pm_init &&
> + !pcie->drvdata->pm_ops->pm_init(pcie))
> + pcie->pm_support = true;
> +
> return 0;
> }
>
> @@ -200,6 +495,14 @@ static int __init 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");
> +
> + if (pcie->drvdata->lut_off)
> + pcie->lut_base = pci->dbi_base + pcie->drvdata->lut_off;
> +
> + if (pcie->drvdata->pf_off)
> + pcie->pf_base = pci->dbi_base + pcie->drvdata->pf_off;
> +
> if (!ls_pcie_is_bridge(pcie))
> return -ENODEV;
>
> @@ -212,11 +515,88 @@ static int __init ls_pcie_probe(struct platform_device *pdev)
> return 0;
> }
>
> +static bool ls_pcie_pm_check(struct ls_pcie *pcie)
> +{
> + if (!pcie->ep_presence) {
> + dev_dbg(pcie->pci->dev, "Endpoint isn't present\n");
> + return false;
> + }
> +
> + if (!pcie->pm_support)
> + return false;
> +
> + return true;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int ls_pcie_suspend_noirq(struct device *dev)
Why is noirq variant needed? Most drivers don't need this.
> +{
> + struct ls_pcie *pcie = dev_get_drvdata(dev);
> + struct dw_pcie *pci = pcie->pci;
> + u32 val;
> + int ret;
> +
> + if (!ls_pcie_pm_check(pcie))
> + return 0;
> +
> + pcie->drvdata->pm_ops->send_turn_off_message(pcie);
> +
> + /* 10ms timeout to check L2 ready */
> + ret = readl_poll_timeout(pci->dbi_base + PCIE_PORT_DEBUG0,
> + val, LS_PCIE_IS_L2(val), 100, 10000);
> + if (ret) {
> + dev_err(dev, "PCIe link enter L2 timeout! ltssm = 0x%x\n", val);
> + return ret;
> + }
> +
> + ls_pcie_set_dstate(pcie, PCIE_PM_SCR_PMEPS_D3);
> +
> + return 0;
> +}
> +
> +static int ls_pcie_resume_noirq(struct device *dev)
> +{
> + struct ls_pcie *pcie = dev_get_drvdata(dev);
> + struct dw_pcie *pci = pcie->pci;
> + int ret;
> +
> + if (!ls_pcie_pm_check(pcie))
> + return 0;
> +
> + ls_pcie_set_dstate(pcie, PCIE_PM_SCR_PMEPS_D0);
> +
> + pcie->drvdata->pm_ops->exit_from_l2(pcie);
> +
> + /* delay 10ms to access EP */
> + mdelay(10);
> +
> + ret = ls_pcie_host_init(&pci->pp);
> + if (ret) {
> + dev_err(dev, "ls_pcie_host_init failed! ret = 0x%x\n", ret);
> + return ret;
> + }
> +
> + ret = dw_pcie_wait_for_link(pci);
> + if (ret) {
> + dev_err(dev, "wait link up timeout! ret = 0x%x\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +#endif /* CONFIG_PM_SLEEP */
> +
> +static const struct dev_pm_ops ls_pcie_pm_ops = {
> + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(ls_pcie_suspend_noirq,
> + ls_pcie_resume_noirq)
> +};
> +
> static struct platform_driver ls_pcie_driver = {
> .driver = {
> .name = "layerscape-pcie",
> .of_match_table = ls_pcie_of_match,
> .suppress_bind_attrs = true,
> + .pm = &ls_pcie_pm_ops,
> },
> };
> builtin_platform_driver_probe(ls_pcie_driver, ls_pcie_probe);
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index f911760dcc69..1f2fd03d1eba 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -46,6 +46,7 @@
> #define PCIE_PORT_DEBUG0 0x728
> #define PORT_LOGIC_LTSSM_STATE_MASK 0x1f
> #define PORT_LOGIC_LTSSM_STATE_L0 0x11
> +#define PORT_LOGIC_LTSSM_STATE_L2 0x15
> #define PCIE_PORT_DEBUG1 0x72C
> #define PCIE_PORT_DEBUG1_LINK_UP BIT(4)
> #define PCIE_PORT_DEBUG1_LINK_IN_TRAINING BIT(29)
> --
> 2.17.1
>
Hi Rob,
Thanks a lot for your comments!
> -----Original Message-----
> From: Rob Herring <[email protected]>
> Sent: 2020??9??15?? 9:30
> To: Z.q. Hou <[email protected]>
> Cc: [email protected]; [email protected];
> [email protected]; [email protected];
> [email protected]; Leo Li <[email protected]>;
> [email protected]; [email protected]; M.h. Lian
> <[email protected]>; Mingkai Hu <[email protected]>; Roy Zang
> <[email protected]>
> Subject: Re: [PATCH 7/7] PCI: layerscape: Add power management support
>
> On Mon, Sep 07, 2020 at 01:38:01PM +0800, Zhiqiang Hou wrote:
> > From: Hou Zhiqiang <[email protected]>
> >
> > Add PME_Turn_Off/PME_TO_Ack handshake sequence, and finally put the
> > PCIe controller into D3 state after the L2/L3 ready state transition
> > process completion.
> >
> > Signed-off-by: Hou Zhiqiang <[email protected]>
> > ---
> > drivers/pci/controller/dwc/pci-layerscape.c | 384
> ++++++++++++++++++-
> > drivers/pci/controller/dwc/pcie-designware.h | 1 +
> > 2 files changed, 383 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-layerscape.c
> > b/drivers/pci/controller/dwc/pci-layerscape.c
> > index be404c16bcbe..ca9ea07f77c1 100644
> > --- a/drivers/pci/controller/dwc/pci-layerscape.c
> > +++ b/drivers/pci/controller/dwc/pci-layerscape.c
> > @@ -3,13 +3,16 @@
> > * PCIe host controller driver for Freescale Layerscape SoCs
> > *
> > * Copyright (C) 2014 Freescale Semiconductor.
> > + * Copyright 2020 NXP
> > *
> > * Author: Minghuan Lian <[email protected]>
> > */
> >
> > +#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_irq.h>
> > @@ -27,17 +30,66 @@
> > #define PCIE_ABSERR 0x8d0 /* Bridge Slave Error Response
> Register */
> > #define PCIE_ABSERR_SETTING 0x9401 /* Forward error of
> non-posted request */
> >
> > +#define PCIE_PM_SCR 0x44
> > +#define PCIE_PM_SCR_PMEPS_D0 0x0
> > +#define PCIE_PM_SCR_PMEPS_D3 0x3
> > +
> > +#define PCIE_LNKCTL 0x80 /* PCIe link ctrl Register */
>
> Use the common defines.
>
OK, will change in next version.
>
> > +
> > +/* PF Message Command Register */
> > +#define LS_PCIE_PF_MCR 0x2c
> > +#define PF_MCR_PTOMR BIT(0)
> > +#define PF_MCR_EXL2S BIT(1)
> > +
> > +/* LS1021A PEXn PM Write Control Register */
> > +#define SCFG_PEXPMWRCR(idx) (0x5c + (idx) * 0x64)
> > +#define PMXMTTURNOFF BIT(31)
> > +#define SCFG_PEXSFTRSTCR 0x190
> > +#define PEXSR(idx) BIT(idx)
> > +
> > +/* LS1043A PEX PME control register */
> > +#define SCFG_PEXPMECR 0x144
> > +#define PEXPME(idx) BIT(31 - (idx) * 4)
> > +
> > +/* LS1043A PEX LUT debug register */
> > +#define LS_PCIE_LDBG 0x7fc
> > +#define LDBG_SR BIT(30)
> > +#define LDBG_WE BIT(31)
> > +
> > #define PCIE_IATU_NUM 6
> >
> > +#define LS_PCIE_IS_L2(v) \
> > + (((v) & PORT_LOGIC_LTSSM_STATE_MASK) ==
> PORT_LOGIC_LTSSM_STATE_L2)
> > +
> > +struct ls_pcie;
> > +
> > +struct ls_pcie_host_pm_ops {
> > + int (*pm_init)(struct ls_pcie *pcie);
> > + void (*send_turn_off_message)(struct ls_pcie *pcie);
> > + void (*exit_from_l2)(struct ls_pcie *pcie); };
> > +
> > struct ls_pcie_drvdata {
> > + const u32 pf_off;
> > + const u32 lut_off;
> > const struct dw_pcie_host_ops *ops;
> > + const struct ls_pcie_host_pm_ops *pm_ops;
> > };
> >
> > struct ls_pcie {
> > struct dw_pcie *pci;
> > const struct ls_pcie_drvdata *drvdata;
> > + void __iomem *pf_base;
> > + void __iomem *lut_base;
> > + bool big_endian;
> > + bool ep_presence;
> > + bool pm_support;
> > + struct regmap *scfg;
> > + int index;
> > };
> >
> > +#define ls_pcie_lut_readl_addr(addr) ls_pcie_lut_readl(pcie, addr)
> > +#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) @@ -86,6 +138,208
> > @@ static void ls_pcie_fix_error_response(struct ls_pcie *pcie)
> > iowrite32(PCIE_ABSERR_SETTING, pci->dbi_base + PCIE_ABSERR); }
> >
> > +static u32 ls_pcie_lut_readl(struct ls_pcie *pcie, u32 off) {
> > + if (pcie->big_endian)
> > + return ioread32be(pcie->lut_base + off);
> > +
> > + return ioread32(pcie->lut_base + off); }
> > +
> > +static void ls_pcie_lut_writel(struct ls_pcie *pcie, u32 off, u32
> > +val) {
> > + if (pcie->big_endian)
> > + return iowrite32be(val, pcie->lut_base + off);
> > +
> > + return iowrite32(val, pcie->lut_base + off);
> > +
> > +}
> > +
> > +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)
> > + return iowrite32be(val, pcie->pf_base + off);
> > +
> > + return iowrite32(val, pcie->pf_base + off);
> > +
> > +}
> > +
> > +static void ls_pcie_send_turnoff_msg(struct ls_pcie *pcie) {
> > + 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), 100, 10000);
> > + if (ret)
> > + dev_info(pcie->pci->dev, "poll turn off message timeout\n"); }
> > +
> > +static void ls1021a_pcie_send_turnoff_msg(struct ls_pcie *pcie) {
> > + u32 val;
> > +
> > + if (!pcie->scfg) {
> > + dev_dbg(pcie->pci->dev, "SYSCFG is NULL\n");
> > + return;
> > + }
> > +
> > + /* Send Turn_off message */
> > + regmap_read(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), &val);
> > + val |= PMXMTTURNOFF;
> > + regmap_write(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), val);
> > +
> > + mdelay(10);
> > +
> > + /* Clear Turn_off message */
> > + regmap_read(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), &val);
> > + val &= ~PMXMTTURNOFF;
> > + regmap_write(pcie->scfg, SCFG_PEXPMWRCR(pcie->index), val); }
> > +
> > +static void ls1043a_pcie_send_turnoff_msg(struct ls_pcie *pcie) {
> > + u32 val;
> > +
> > + if (!pcie->scfg) {
> > + dev_dbg(pcie->pci->dev, "SYSCFG is NULL\n");
> > + return;
> > + }
> > +
> > + /* Send Turn_off message */
> > + regmap_read(pcie->scfg, SCFG_PEXPMECR, &val);
> > + val |= PEXPME(pcie->index);
> > + regmap_write(pcie->scfg, SCFG_PEXPMECR, val);
> > +
> > + mdelay(10);
> > +
> > + /* Clear Turn_off message */
> > + regmap_read(pcie->scfg, SCFG_PEXPMECR, &val);
> > + val &= ~PEXPME(pcie->index);
> > + regmap_write(pcie->scfg, SCFG_PEXPMECR, val); }
> > +
> > +static void ls_pcie_exit_from_l2(struct ls_pcie *pcie) {
> > + 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), 100, 10000);
> > + if (ret)
> > + dev_info(pcie->pci->dev, "poll exit L2 state timeout\n"); }
> > +
> > +static void ls_pcie_retrain_link(struct ls_pcie *pcie) {
> > + struct dw_pcie *pci = pcie->pci;
> > + u32 val;
> > +
> > + val = dw_pcie_readw_dbi(pci, PCIE_LNKCTL);
> > + val |= PCI_EXP_LNKCTL_RL;
> > + dw_pcie_writew_dbi(pci, PCIE_LNKCTL, val); }
> > +
> > +static void ls1021a_pcie_exit_from_l2(struct ls_pcie *pcie) {
> > + u32 val;
> > +
> > + regmap_read(pcie->scfg, SCFG_PEXSFTRSTCR, &val);
> > + val |= PEXSR(pcie->index);
> > + regmap_write(pcie->scfg, SCFG_PEXSFTRSTCR, val);
> > +
> > + regmap_read(pcie->scfg, SCFG_PEXSFTRSTCR, &val);
> > + val &= ~PEXSR(pcie->index);
> > + regmap_write(pcie->scfg, SCFG_PEXSFTRSTCR, val);
> > +
> > + mdelay(1);
> > +
> > + ls_pcie_retrain_link(pcie);
> > +}
> > +static void ls1043a_pcie_exit_from_l2(struct ls_pcie *pcie) {
> > + u32 val;
> > +
> > + val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
> > + val |= LDBG_WE;
> > + ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
> > +
> > + val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
> > + val |= LDBG_SR;
> > + ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
> > +
> > + val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
> > + val &= ~LDBG_SR;
> > + ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
> > +
> > + val = ls_pcie_lut_readl(pcie, LS_PCIE_LDBG);
> > + val &= ~LDBG_WE;
> > + ls_pcie_lut_writel(pcie, LS_PCIE_LDBG, val);
> > +
> > + mdelay(1);
> > +
> > + ls_pcie_retrain_link(pcie);
> > +}
> > +
> > +static int ls1021a_pcie_pm_init(struct ls_pcie *pcie) {
> > + struct device *dev = pcie->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;
> > + }
> > +
> > + ret = of_property_read_u32_array(dev->of_node, "fsl,pcie-scfg",
> > + index, 2);
> > + if (ret) {
> > + pcie->scfg = NULL;
> > + return ret;
> > + }
> > +
> > + pcie->index = index[1];
> > +
> > + return 0;
> > +}
> > +
> > +static int ls_pcie_pm_init(struct ls_pcie *pcie) {
> > + return 0;
> > +}
> > +
> > +static void ls_pcie_set_dstate(struct ls_pcie *pcie, u32 dstate) {
> > + struct dw_pcie *pci = pcie->pci;
> > + u32 val;
> > +
> > + val = dw_pcie_readw_dbi(pci, PCIE_PM_SCR);
> > + val &= ~PCI_PM_CTRL_STATE_MASK;
> > + val |= dstate;
> > + dw_pcie_writew_dbi(pci, PCIE_PM_SCR, val); }
> > +
> > static int ls_pcie_host_init(struct pcie_port *pp) {
> > struct dw_pcie *pci = to_dw_pcie_from_pp(pp); @@ -133,20 +387,52
> @@
> > static int ls_pcie_msi_host_init(struct pcie_port *pp)
> > return 0;
> > }
> >
> > +static struct ls_pcie_host_pm_ops ls1021a_pcie_host_pm_ops = {
> > + .pm_init = &ls1021a_pcie_pm_init,
> > + .send_turn_off_message = &ls1021a_pcie_send_turnoff_msg,
> > + .exit_from_l2 = &ls1021a_pcie_exit_from_l2, };
> > +
> > +static struct ls_pcie_host_pm_ops ls1043a_pcie_host_pm_ops = {
> > + .pm_init = &ls1021a_pcie_pm_init,
> > + .send_turn_off_message = &ls1043a_pcie_send_turnoff_msg,
> > + .exit_from_l2 = &ls1043a_pcie_exit_from_l2, };
> > +
> > +static struct ls_pcie_host_pm_ops ls_pcie_host_pm_ops = {
> > + .pm_init = &ls_pcie_pm_init,
> > + .send_turn_off_message = &ls_pcie_send_turnoff_msg,
> > + .exit_from_l2 = &ls_pcie_exit_from_l2, };
> > +
> > static const struct dw_pcie_host_ops ls_pcie_host_ops = {
> > .host_init = ls_pcie_host_init,
> > .msi_host_init = ls_pcie_msi_host_init, };
> >
> > +static const struct ls_pcie_drvdata ls1021a_drvdata = {
> > + .ops = &ls_pcie_host_ops,
> > + .pm_ops = &ls1021a_pcie_host_pm_ops, };
> > +
> > +static const struct ls_pcie_drvdata ls1043a_drvdata = {
> > + .ops = &ls_pcie_host_ops,
> > + .lut_off = 0x10000,
> > + .pm_ops = &ls1043a_pcie_host_pm_ops, };
> > +
> > static const struct ls_pcie_drvdata layerscape_drvdata = {
> > .ops = &ls_pcie_host_ops,
> > + .lut_off = 0x80000,
> > + .pf_off = 0xc0000,
> > + .pm_ops = &ls_pcie_host_pm_ops,
> > };
> >
> > static const struct of_device_id ls_pcie_of_match[] = {
> > { .compatible = "fsl,ls1012a-pcie", .data = &layerscape_drvdata },
> > - { .compatible = "fsl,ls1021a-pcie", .data = &layerscape_drvdata },
> > + { .compatible = "fsl,ls1021a-pcie", .data = &ls1021a_drvdata },
> > { .compatible = "fsl,ls1028a-pcie", .data = &layerscape_drvdata },
> > - { .compatible = "fsl,ls1043a-pcie", .data = &layerscape_drvdata },
> > + { .compatible = "fsl,ls1043a-pcie", .data = &ls1043a_drvdata },
> > { .compatible = "fsl,ls1046a-pcie", .data = &layerscape_drvdata },
> > { .compatible = "fsl,ls2080a-pcie", .data = &layerscape_drvdata },
> > { .compatible = "fsl,ls2085a-pcie", .data = &layerscape_drvdata },
> > @@ -170,6 +456,15 @@ static int __init ls_add_pcie_port(struct ls_pcie
> *pcie)
> > return ret;
> > }
> >
> > + if (dw_pcie_link_up(pci)) {
> > + dev_dbg(pci->dev, "Endpoint is present\n");
> > + pcie->ep_presence = true;
> > + }
> > +
> > + if (pcie->drvdata->pm_ops && pcie->drvdata->pm_ops->pm_init &&
> > + !pcie->drvdata->pm_ops->pm_init(pcie))
> > + pcie->pm_support = true;
> > +
> > return 0;
> > }
> >
> > @@ -200,6 +495,14 @@ static int __init 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");
> > +
> > + if (pcie->drvdata->lut_off)
> > + pcie->lut_base = pci->dbi_base + pcie->drvdata->lut_off;
> > +
> > + if (pcie->drvdata->pf_off)
> > + pcie->pf_base = pci->dbi_base + pcie->drvdata->pf_off;
> > +
> > if (!ls_pcie_is_bridge(pcie))
> > return -ENODEV;
> >
> > @@ -212,11 +515,88 @@ static int __init ls_pcie_probe(struct
> platform_device *pdev)
> > return 0;
> > }
> >
> > +static bool ls_pcie_pm_check(struct ls_pcie *pcie) {
> > + if (!pcie->ep_presence) {
> > + dev_dbg(pcie->pci->dev, "Endpoint isn't present\n");
> > + return false;
> > + }
> > +
> > + if (!pcie->pm_support)
> > + return false;
> > +
> > + return true;
> > +}
> > +
> > +#ifdef CONFIG_PM_SLEEP
> > +static int ls_pcie_suspend_noirq(struct device *dev)
>
> Why is noirq variant needed? Most drivers don't need this.
Actually all PCIe RC drivers use the noirq variant, the reason
is the pci_pm_suspend_noirq() will call the pci_save_state().
Regards,
Zhiqiang
>
> > +{
> > + struct ls_pcie *pcie = dev_get_drvdata(dev);
> > + struct dw_pcie *pci = pcie->pci;
> > + u32 val;
> > + int ret;
> > +
> > + if (!ls_pcie_pm_check(pcie))
> > + return 0;
> > +
> > + pcie->drvdata->pm_ops->send_turn_off_message(pcie);
> > +
> > + /* 10ms timeout to check L2 ready */
> > + ret = readl_poll_timeout(pci->dbi_base + PCIE_PORT_DEBUG0,
> > + val, LS_PCIE_IS_L2(val), 100, 10000);
> > + if (ret) {
> > + dev_err(dev, "PCIe link enter L2 timeout! ltssm = 0x%x\n", val);
> > + return ret;
> > + }
> > +
> > + ls_pcie_set_dstate(pcie, PCIE_PM_SCR_PMEPS_D3);
> > +
> > + return 0;
> > +}
> > +
> > +static int ls_pcie_resume_noirq(struct device *dev) {
> > + struct ls_pcie *pcie = dev_get_drvdata(dev);
> > + struct dw_pcie *pci = pcie->pci;
> > + int ret;
> > +
> > + if (!ls_pcie_pm_check(pcie))
> > + return 0;
> > +
> > + ls_pcie_set_dstate(pcie, PCIE_PM_SCR_PMEPS_D0);
> > +
> > + pcie->drvdata->pm_ops->exit_from_l2(pcie);
> > +
> > + /* delay 10ms to access EP */
> > + mdelay(10);
> > +
> > + ret = ls_pcie_host_init(&pci->pp);
> > + if (ret) {
> > + dev_err(dev, "ls_pcie_host_init failed! ret = 0x%x\n", ret);
> > + return ret;
> > + }
> > +
> > + ret = dw_pcie_wait_for_link(pci);
> > + if (ret) {
> > + dev_err(dev, "wait link up timeout! ret = 0x%x\n", ret);
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> > +#endif /* CONFIG_PM_SLEEP */
> > +
> > +static const struct dev_pm_ops ls_pcie_pm_ops = {
> > + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(ls_pcie_suspend_noirq,
> > + ls_pcie_resume_noirq)
> > +};
> > +
> > static struct platform_driver ls_pcie_driver = {
> > .driver = {
> > .name = "layerscape-pcie",
> > .of_match_table = ls_pcie_of_match,
> > .suppress_bind_attrs = true,
> > + .pm = &ls_pcie_pm_ops,
> > },
> > };
> > builtin_platform_driver_probe(ls_pcie_driver, ls_pcie_probe); diff
> > --git a/drivers/pci/controller/dwc/pcie-designware.h
> > b/drivers/pci/controller/dwc/pcie-designware.h
> > index f911760dcc69..1f2fd03d1eba 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware.h
> > +++ b/drivers/pci/controller/dwc/pcie-designware.h
> > @@ -46,6 +46,7 @@
> > #define PCIE_PORT_DEBUG0 0x728
> > #define PORT_LOGIC_LTSSM_STATE_MASK 0x1f
> > #define PORT_LOGIC_LTSSM_STATE_L0 0x11
> > +#define PORT_LOGIC_LTSSM_STATE_L2 0x15
> > #define PCIE_PORT_DEBUG1 0x72C
> > #define PCIE_PORT_DEBUG1_LINK_UP BIT(4)
> > #define PCIE_PORT_DEBUG1_LINK_IN_TRAINING BIT(29)
> > --
> > 2.17.1
> >