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usb: cdns3: imx: add glue layer runtime pm implementation

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Add imx glue layer runtime pm implementation, and the runtime
pm is default off.

Reviewed-by: Pawel Laszczak <pawell@cadence.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
This commit is contained in:
Peter Chen 2020-09-02 17:57:33 +08:00 committed by Felipe Balbi
parent b1234e3b3b
commit ff6d6e6c67
1 changed files with 186 additions and 5 deletions
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191
drivers/usb/cdns3/cdns3-imx.c
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@ -15,6 +15,8 @@
#include <linux/io.h>
#include <linux/of_platform.h>
#include <linux/iopoll.h>
#include <linux/pm_runtime.h>
#include "core.h"
#define USB3_CORE_CTRL1 0x00
#define USB3_CORE_CTRL2 0x04
@ -32,7 +34,7 @@
/* Register bits definition */
/* USB3_CORE_CTRL1 */
#define SW_RESET_MASK (0x3f << 26)
#define SW_RESET_MASK GENMASK(31, 26)
#define PWR_SW_RESET BIT(31)
#define APB_SW_RESET BIT(30)
#define AXI_SW_RESET BIT(29)
@ -53,8 +55,8 @@
#define LPM_CLK_REQ BIT(28)
#define DEVU3_WAEKUP_EN BIT(14)
#define OTG_WAKEUP_EN BIT(12)
#define DEV_INT_EN (3 << 8) /* DEV INT b9:8 */
#define HOST_INT1_EN (1 << 0) /* HOST INT b7:0 */
#define DEV_INT_EN (3 << 8) /* DEV INT b9:8 */
#define HOST_INT1_EN (1 << 0) /* HOST INT b7:0 */
/* USB3_CORE_STATUS */
#define MDCTRL_CLK_STATUS BIT(15)
@ -66,11 +68,30 @@
#define CLK_VALID_COMPARE_BITS (0xf << 28)
#define PHY_REFCLK_REQ (1 << 0)
/* OTG registers definition */
#define OTGSTS 0x4
/* OTGSTS */
#define OTG_NRDY BIT(11)
/* xHCI registers definition */
#define XECP_PM_PMCSR 0x8018
#define XECP_AUX_CTRL_REG1 0x8120
/* Register bits definition */
/* XECP_AUX_CTRL_REG1 */
#define CFG_RXDET_P3_EN BIT(15)
/* XECP_PM_PMCSR */
#define PS_MASK GENMASK(1, 0)
#define PS_D0 0
#define PS_D1 1
struct cdns_imx {
struct device *dev;
void __iomem *noncore;
struct clk_bulk_data *clks;
int num_clks;
struct platform_device *cdns3_pdev;
};
static inline u32 cdns_imx_readl(struct cdns_imx *data, u32 offset)
@ -126,6 +147,20 @@ static int cdns_imx_noncore_init(struct cdns_imx *data)
return ret;
}
static int cdns_imx_platform_suspend(struct device *dev,
bool suspend, bool wakeup);
static struct cdns3_platform_data cdns_imx_pdata = {
.platform_suspend = cdns_imx_platform_suspend,
};
static const struct of_dev_auxdata cdns_imx_auxdata[] = {
{
.compatible = "cdns,usb3",
.platform_data = &cdns_imx_pdata,
},
{},
};
static int cdns_imx_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -162,14 +197,18 @@ static int cdns_imx_probe(struct platform_device *pdev)
if (ret)
goto err;
ret = of_platform_populate(node, NULL, NULL, dev);
ret = of_platform_populate(node, NULL, cdns_imx_auxdata, dev);
if (ret) {
dev_err(dev, "failed to create children: %d\n", ret);
goto err;
}
return ret;
device_set_wakeup_capable(dev, true);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
pm_runtime_forbid(dev);
return ret;
err:
clk_bulk_disable_unprepare(data->num_clks, data->clks);
return ret;
@ -194,6 +233,147 @@ static int cdns_imx_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM
static void cdns3_set_wakeup(struct cdns_imx *data, bool enable)
{
u32 value;
value = cdns_imx_readl(data, USB3_INT_REG);
if (enable)
value |= OTG_WAKEUP_EN | DEVU3_WAEKUP_EN;
else
value &= ~(OTG_WAKEUP_EN | DEVU3_WAEKUP_EN);
cdns_imx_writel(data, USB3_INT_REG, value);
}
static int cdns_imx_platform_suspend(struct device *dev,
bool suspend, bool wakeup)
{
struct cdns3 *cdns = dev_get_drvdata(dev);
struct device *parent = dev->parent;
struct cdns_imx *data = dev_get_drvdata(parent);
void __iomem *otg_regs = (void __iomem *)(cdns->otg_regs);
void __iomem *xhci_regs = cdns->xhci_regs;
u32 value;
int ret = 0;
if (cdns->role != USB_ROLE_HOST)
return 0;
if (suspend) {
/* SW request low power when all usb ports allow to it ??? */
value = readl(xhci_regs + XECP_PM_PMCSR);
value &= ~PS_MASK;
value |= PS_D1;
writel(value, xhci_regs + XECP_PM_PMCSR);
/* mdctrl_clk_sel */
value = cdns_imx_readl(data, USB3_CORE_CTRL1);
value |= MDCTRL_CLK_SEL;
cdns_imx_writel(data, USB3_CORE_CTRL1, value);
/* wait for mdctrl_clk_status */
value = cdns_imx_readl(data, USB3_CORE_STATUS);
ret = readl_poll_timeout(data->noncore + USB3_CORE_STATUS, value,
(value & MDCTRL_CLK_STATUS) == MDCTRL_CLK_STATUS,
10, 100000);
if (ret)
dev_warn(parent, "wait mdctrl_clk_status timeout\n");
/* wait lpm_clk_req to be 0 */
value = cdns_imx_readl(data, USB3_INT_REG);
ret = readl_poll_timeout(data->noncore + USB3_INT_REG, value,
(value & LPM_CLK_REQ) != LPM_CLK_REQ,
10, 100000);
if (ret)
dev_warn(parent, "wait lpm_clk_req timeout\n");
/* wait phy_refclk_req to be 0 */
value = cdns_imx_readl(data, USB3_SSPHY_STATUS);
ret = readl_poll_timeout(data->noncore + USB3_SSPHY_STATUS, value,
(value & PHY_REFCLK_REQ) != PHY_REFCLK_REQ,
10, 100000);
if (ret)
dev_warn(parent, "wait phy_refclk_req timeout\n");
cdns3_set_wakeup(data, wakeup);
} else {
cdns3_set_wakeup(data, false);
/* SW request D0 */
value = readl(xhci_regs + XECP_PM_PMCSR);
value &= ~PS_MASK;
value |= PS_D0;
writel(value, xhci_regs + XECP_PM_PMCSR);
/* clr CFG_RXDET_P3_EN */
value = readl(xhci_regs + XECP_AUX_CTRL_REG1);
value &= ~CFG_RXDET_P3_EN;
writel(value, xhci_regs + XECP_AUX_CTRL_REG1);
/* clear mdctrl_clk_sel */
value = cdns_imx_readl(data, USB3_CORE_CTRL1);
value &= ~MDCTRL_CLK_SEL;
cdns_imx_writel(data, USB3_CORE_CTRL1, value);
/* wait CLK_125_REQ to be 1 */
value = cdns_imx_readl(data, USB3_INT_REG);
ret = readl_poll_timeout(data->noncore + USB3_INT_REG, value,
(value & CLK_125_REQ) == CLK_125_REQ,
10, 100000);
if (ret)
dev_warn(parent, "wait CLK_125_REQ timeout\n");
/* wait for mdctrl_clk_status is cleared */
value = cdns_imx_readl(data, USB3_CORE_STATUS);
ret = readl_poll_timeout(data->noncore + USB3_CORE_STATUS, value,
(value & MDCTRL_CLK_STATUS) != MDCTRL_CLK_STATUS,
10, 100000);
if (ret)
dev_warn(parent, "wait mdctrl_clk_status cleared timeout\n");
/* Wait until OTG_NRDY is 0 */
value = readl(otg_regs + OTGSTS);
ret = readl_poll_timeout(otg_regs + OTGSTS, value,
(value & OTG_NRDY) != OTG_NRDY,
10, 100000);
if (ret)
dev_warn(parent, "wait OTG ready timeout\n");
}
return ret;
}
static int cdns_imx_resume(struct device *dev)
{
struct cdns_imx *data = dev_get_drvdata(dev);
return clk_bulk_prepare_enable(data->num_clks, data->clks);
}
static int cdns_imx_suspend(struct device *dev)
{
struct cdns_imx *data = dev_get_drvdata(dev);
clk_bulk_disable_unprepare(data->num_clks, data->clks);
return 0;
}
#else
static int cdns_imx_platform_suspend(struct device *dev,
bool suspend, bool wakeup)
{
return 0;
}
#endif /* CONFIG_PM */
static const struct dev_pm_ops cdns_imx_pm_ops = {
SET_RUNTIME_PM_OPS(cdns_imx_suspend, cdns_imx_resume, NULL)
};
static const struct of_device_id cdns_imx_of_match[] = {
{ .compatible = "fsl,imx8qm-usb3", },
{},
@ -206,6 +386,7 @@ static struct platform_driver cdns_imx_driver = {
.driver = {
.name = "cdns3-imx",
.of_match_table = cdns_imx_of_match,
.pm = &cdns_imx_pm_ops,
},
};
module_platform_driver(cdns_imx_driver);