On Mon, Aug 21, 2023 at 02:48:15PM -0400, Frank Li wrote: > From: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx> > > 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@xxxxxxxxxx> > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx> > Signed-off-by: Frank Li <Frank.Li@xxxxxxx> > --- > drivers/pci/controller/dwc/pci-layerscape.c | 135 ++++++++++++++++++-- > 1 file changed, 126 insertions(+), 9 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c > index ed5fb492fe08..97b8d3329df7 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@xxxxxxxxxxxxx> > */ > > +#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 +90,64 @@ 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; > + > + /* > + * Set PF_MCR_EXL2S bit in LS_PCIE_PF_MCR register for the link > + * to exit L2 state. > + */ > + 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), > + 1000, > + 10000); I can add a comment myself - please explain how this delay was chosen, any piece of information could be useful for a future developer, let me know and I will add it. > + 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 +166,27 @@ 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, > +}; > + > +static const struct ls_pcie_drvdata ls1021a_drvdata = { I suggest adding .pm_support = false explicitly here, I can do it myself. Thanks, Lorenzo > +}; > + > +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 +205,8 @@ 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 +217,10 @@ 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 +229,39 @@ 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; > + > + ls_pcie_exit_from_l2(&pcie->pci->pp); > + > + 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 >