From: Gregory Herrero <gregory.herrero@xxxxxxxxx>
When suspending usb bus, phy driver may disable controller power.
In this case, registers need to be saved on suspend and restored
on resume.
Signed-off-by: Gregory Herrero <gregory.herrero@xxxxxxxxx>
---
drivers/usb/dwc2/core.c | 377 ++++++++++++++++++++++++++++++++++++++++++++++++
drivers/usb/dwc2/core.h | 84 +++++++++++
2 files changed, 461 insertions(+)
diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c
index d5197d4..889dc5f 100644
--- a/drivers/usb/dwc2/core.c
+++ b/drivers/usb/dwc2/core.c
@@ -56,6 +56,383 @@
#include "core.h"
#include "hcd.h"
+#if IS_ENABLED(CONFIG_USB_DWC2_HOST) || IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)
+/**
+ * dwc2_backup_host_registers() - Backup controller host registers.
+ * When suspending usb bus, registers needs to be backuped
+ * if controller power is disabled once suspended.
+ *
+ * @hsotg: Programming view of the DWC_otg controller
+ */
+static int dwc2_backup_host_registers(struct dwc2_hsotg *hsotg)
+{
+ struct dwc2_hregs_backup *hr;
+ int i;
+
+ dev_dbg(hsotg->dev, "%s\n", __func__);
+
+ /* Backup Host regs */
+ hr = hsotg->hr_backup;
+ if (!hr) {
+ hr = devm_kzalloc(hsotg->dev, sizeof(*hr), GFP_KERNEL);
+ if (!hr) {
+ dev_err(hsotg->dev, "%s: can't allocate host regs\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ hsotg->hr_backup = hr;
+ }
+ hr->hcfg = readl(hsotg->regs + HCFG);
+ hr->haintmsk = readl(hsotg->regs + HAINTMSK);
+ for (i = 0; i < hsotg->core_params->host_channels; ++i)
+ hr->hcintmsk[i] = readl(hsotg->regs + HCINTMSK(i));
+
+ hr->hprt0 = readl(hsotg->regs + HPRT0);
+ hr->hfir = readl(hsotg->regs + HFIR);
+
+ return 0;
+}
+
+/**
+ * dwc2_restore_host_registers() - Restore controller host registers.
+ * When resuming usb bus, device registers needs to be restored
+ * if controller power were disabled.
+ *
+ * @hsotg: Programming view of the DWC_otg controller
+ */
+static int dwc2_restore_host_registers(struct dwc2_hsotg *hsotg)
+{
+ struct dwc2_hregs_backup *hr;
+ int i;
+
+ dev_dbg(hsotg->dev, "%s\n", __func__);
+
+ /* Restore host regs */
+ hr = hsotg->hr_backup;
+ if (!hr) {
+ dev_err(hsotg->dev, "%s: no host registers to restore\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ writel(hr->hcfg, hsotg->regs + HCFG);
+ writel(hr->haintmsk, hsotg->regs + HAINTMSK);
+
+ for (i = 0; i < hsotg->core_params->host_channels; ++i)
+ writel(hr->hcintmsk[i], hsotg->regs + HCINTMSK(i));
+
+ writel(hr->hprt0, hsotg->regs + HPRT0);
+ writel(hr->hfir, hsotg->regs + HFIR);
+
+ return 0;
+}
+#else
+static inline int dwc2_backup_host_registers(struct dwc2_hsotg *hsotg)
+{ return 0; }
+
+static inline int dwc2_restore_host_registers(struct dwc2_hsotg *hsotg)
+{ return 0; }
+#endif
+
+#if IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL) || \
+ IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)
+/**
+ * dwc2_backup_device_registers() - Backup controller device registers.
+ * When suspending usb bus, registers needs to be backuped
+ * if controller power is disabled once suspended.
+ *
+ * @hsotg: Programming view of the DWC_otg controller
+ */
+static int dwc2_backup_device_registers(struct dwc2_hsotg *hsotg)
+{
+ struct dwc2_dregs_backup *dr;
+ int i;
+
+ dev_dbg(hsotg->dev, "%s\n", __func__);
+
+ /* Backup dev regs */
+ dr = hsotg->dr_backup;
+ if (!dr) {
+ dr = devm_kzalloc(hsotg->dev, sizeof(*dr), GFP_KERNEL);
+ if (!dr) {
+ dev_err(hsotg->dev, "%s: can't allocate device regs\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ hsotg->dr_backup = dr;
+ }
+
+ dr->dcfg = readl(hsotg->regs + DCFG);
+ dr->dctl = readl(hsotg->regs + DCTL);
+ dr->daintmsk = readl(hsotg->regs + DAINTMSK);
+ dr->diepmsk = readl(hsotg->regs + DIEPMSK);
+ dr->doepmsk = readl(hsotg->regs + DOEPMSK);
+
+ for (i = 0; i < hsotg->num_of_eps; i++) {
+ /* Backup IN EPs */
+ dr->diepctl[i] = readl(hsotg->regs + DIEPCTL(i));
+
+ /* Ensure DATA PID is correctly configured */
+ if (dr->diepctl[i] & DXEPCTL_DPID)
+ dr->diepctl[i] |= DXEPCTL_SETD1PID;
+ else
+ dr->diepctl[i] |= DXEPCTL_SETD0PID;
+
+ dr->dieptsiz[i] = readl(hsotg->regs + DIEPTSIZ(i));
+ dr->diepdma[i] = readl(hsotg->regs + DIEPDMA(i));
+
+ /* Backup OUT EPs */
+ dr->doepctl[i] = readl(hsotg->regs + DOEPCTL(i));
+
+ /* Ensure DATA PID is correctly configured */
+ if (dr->doepctl[i] & DXEPCTL_DPID)
+ dr->doepctl[i] |= DXEPCTL_SETD1PID;
+ else
+ dr->doepctl[i] |= DXEPCTL_SETD0PID;
+
+ dr->doeptsiz[i] = readl(hsotg->regs + DOEPTSIZ(i));
+ dr->doepdma[i] = readl(hsotg->regs + DOEPDMA(i));
+ }
+
+ return 0;
+}
+
+/**
+ * dwc2_restore_device_registers() - Restore controller device registers.
+ * When resuming usb bus, device registers needs to be restored
+ * if controller power were disabled.
+ *
+ * @hsotg: Programming view of the DWC_otg controller
+ */
+static int dwc2_restore_device_registers(struct dwc2_hsotg *hsotg)
+{
+ struct dwc2_dregs_backup *dr;
+ u32 dctl;
+ int i;
+
+ dev_dbg(hsotg->dev, "%s\n", __func__);
+
+ /* Restore dev regs */
+ dr = hsotg->dr_backup;
+ if (!dr) {
+ dev_err(hsotg->dev, "%s: no device registers to restore\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ writel(dr->dcfg, hsotg->regs + DCFG);
+ writel(dr->dctl, hsotg->regs + DCTL);
+ writel(dr->daintmsk, hsotg->regs + DAINTMSK);
+ writel(dr->diepmsk, hsotg->regs + DIEPMSK);
+ writel(dr->doepmsk, hsotg->regs + DOEPMSK);
+
+ for (i = 0; i < hsotg->num_of_eps; i++) {
+ /* Restore IN EPs */
+ writel(dr->diepctl[i], hsotg->regs + DIEPCTL(i));
+ writel(dr->dieptsiz[i], hsotg->regs + DIEPTSIZ(i));
+ writel(dr->diepdma[i], hsotg->regs + DIEPDMA(i));
+
+ /* Restore OUT EPs */
+ writel(dr->doepctl[i], hsotg->regs + DOEPCTL(i));
+ writel(dr->doeptsiz[i], hsotg->regs + DOEPTSIZ(i));
+ writel(dr->doepdma[i], hsotg->regs + DOEPDMA(i));
+ }
+
+ /* Set the Power-On Programming done bit */
+ dctl = readl(hsotg->regs + DCTL);
+ dctl |= DCTL_PWRONPRGDONE;
+ writel(dctl, hsotg->regs + DCTL);
+
+ return 0;
+}
+#else
+static inline int dwc2_backup_device_registers(struct dwc2_hsotg *hsotg)
+{ return 0; }
+
+static inline int dwc2_restore_device_registers(struct dwc2_hsotg *hsotg)
+{ return 0; }
+#endif
+
+/**
+ * dwc2_backup_global_registers() - Backup global controller registers.
+ * When suspending usb bus, registers needs to be backuped
+ * if controller power is disabled once suspended.
+ *
+ * @hsotg: Programming view of the DWC_otg controller
+ */
+static int dwc2_backup_global_registers(struct dwc2_hsotg *hsotg)
+{
+ struct dwc2_gregs_backup *gr;
+ int i;
+
+ /* Backup global regs */
+ gr = hsotg->gr_backup;
+ if (!gr) {
+ gr = devm_kzalloc(hsotg->dev, sizeof(*gr), GFP_KERNEL);
+ if (!gr) {
+ dev_err(hsotg->dev, "%s: can't allocate global regs\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ hsotg->gr_backup = gr;
+ }
+
+ gr->gotgctl = readl(hsotg->regs + GOTGCTL);
+ gr->gintmsk = readl(hsotg->regs + GINTMSK);
+ gr->gahbcfg = readl(hsotg->regs + GAHBCFG);
+ gr->gusbcfg = readl(hsotg->regs + GUSBCFG);
+ gr->grxfsiz = readl(hsotg->regs + GRXFSIZ);
+ gr->gnptxfsiz = readl(hsotg->regs + GNPTXFSIZ);
+ gr->hptxfsiz = readl(hsotg->regs + HPTXFSIZ);
+ gr->gdfifocfg = readl(hsotg->regs + GDFIFOCFG);
+ for (i = 0; i < MAX_EPS_CHANNELS; i++)
+ gr->dtxfsiz[i] = readl(hsotg->regs + DPTXFSIZN(i));
+
+ return 0;
+}
+
+/**
+ * dwc2_restore_global_registers() - Restore controller global registers.
+ * When resuming usb bus, device registers needs to be restored
+ * if controller power were disabled.
+ *
+ * @hsotg: Programming view of the DWC_otg controller
+ */
+static int dwc2_restore_global_registers(struct dwc2_hsotg *hsotg)
+{
+ struct dwc2_gregs_backup *gr;
+ int i;
+
+ dev_dbg(hsotg->dev, "%s\n", __func__);
+
+ /* Restore global regs */
+ gr = hsotg->gr_backup;
+ if (!gr) {
+ dev_err(hsotg->dev, "%s: no global registers to restore\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ writel(0xffffffff, hsotg->regs + GINTSTS);
+ writel(gr->gotgctl, hsotg->regs + GOTGCTL);
+ writel(gr->gintmsk, hsotg->regs + GINTMSK);
+ writel(gr->gusbcfg, hsotg->regs + GUSBCFG);
+ writel(gr->gahbcfg, hsotg->regs + GAHBCFG);
+ writel(gr->grxfsiz, hsotg->regs + GRXFSIZ);
+ writel(gr->gnptxfsiz, hsotg->regs + GNPTXFSIZ);
+ writel(gr->hptxfsiz, hsotg->regs + HPTXFSIZ);
+ writel(gr->gdfifocfg, hsotg->regs + GDFIFOCFG);
+ for (i = 0; i < MAX_EPS_CHANNELS; i++)
+ writel(gr->dtxfsiz[i], hsotg->regs + DPTXFSIZN(i));
+
+ return 0;
+}
+
+/**
+ * dwc2_exit_hibernation() - Exit controller from Partial Power Down.
+ *
+ * @hsotg: Programming view of the DWC_otg controller
+ * @restore: Controller registers need to be restored
+ */
+int dwc2_exit_hibernation(struct dwc2_hsotg *hsotg, bool restore)
+{
+ u32 pcgcctl;
+ int ret = 0;
+
+ pcgcctl = readl(hsotg->regs + PCGCTL);
+ pcgcctl &= ~PCGCTL_STOPPCLK;
+ writel(pcgcctl, hsotg->regs + PCGCTL);
+
+ pcgcctl = readl(hsotg->regs + PCGCTL);
+ pcgcctl &= ~PCGCTL_PWRCLMP;
+ writel(pcgcctl, hsotg->regs + PCGCTL);
+
+ pcgcctl = readl(hsotg->regs + PCGCTL);
+ pcgcctl &= ~PCGCTL_RSTPDWNMODULE;
+ writel(pcgcctl, hsotg->regs + PCGCTL);
+
+ udelay(100);
+ if (restore) {
+ ret = dwc2_restore_global_registers(hsotg);
+ if (ret) {
+ dev_err(hsotg->dev, "%s: failed to restore registers\n",
+ __func__);
+ return ret;
+ }
+ if (dwc2_is_host_mode(hsotg)) {
+ ret = dwc2_restore_host_registers(hsotg);
+ if (ret) {
+ dev_err(hsotg->dev, "%s: failed to restore host registers\n",
+ __func__);
+ return ret;
+ }
+ } else {
+ ret = dwc2_restore_device_registers(hsotg);
+ if (ret) {
+ dev_err(hsotg->dev, "%s: failed to restore device registers\n",
+ __func__);
+ return ret;
+ }
+ }
+ }
+
+ return ret;
+}
+
+/**
+ * dwc2_enter_hibernation() - Put controller in Partial Power Down.
+ *
+ * @hsotg: Programming view of the DWC_otg controller
+ */
+int dwc2_enter_hibernation(struct dwc2_hsotg *hsotg)
+{
+ u32 pcgcctl;
+ int ret = 0;
+
+ /* Backup all registers */
+ ret = dwc2_backup_global_registers(hsotg);
+ if (ret) {
+ dev_err(hsotg->dev, "%s: failed to backup global registers\n",
+ __func__);
+ return ret;
+ }
+
+ if (dwc2_is_host_mode(hsotg)) {
+ ret = dwc2_backup_host_registers(hsotg);
+ if (ret) {
+ dev_err(hsotg->dev, "%s: failed to backup host registers\n",
+ __func__);
+ return ret;
+ }
+ } else {
+ ret = dwc2_backup_device_registers(hsotg);
+ if (ret) {
+ dev_err(hsotg->dev, "%s: failed to backup device registers\n",
+ __func__);
+ return ret;
+ }
+ }
+
+ /* Put the controller in low power state */
+ pcgcctl = readl(hsotg->regs + PCGCTL);
+
+ pcgcctl |= PCGCTL_PWRCLMP;
+ writel(pcgcctl, hsotg->regs + PCGCTL);
+ ndelay(20);
+
+ pcgcctl |= PCGCTL_RSTPDWNMODULE;
+ writel(pcgcctl, hsotg->regs + PCGCTL);
+ ndelay(20);
+
+ pcgcctl |= PCGCTL_STOPPCLK;
+ writel(pcgcctl, hsotg->regs + PCGCTL);
+
+ return ret;
+}
+
/**
* dwc2_enable_common_interrupts() - Initializes the commmon interrupts,
* used in both device and host modes
diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index 1fd8d2b..b0ee951 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -452,6 +452,82 @@ struct dwc2_hw_params {
#define DWC2_CTRL_BUFF_SIZE 8
/**
+ * struct dwc2_gregs_backup - Holds global registers state before entering partial
+ * power down
+ * @gotgctl: Backup of GOTGCTL register
+ * @gintmsk: Backup of GINTMSK register
+ * @gahbcfg: Backup of GAHBCFG register
+ * @gusbcfg: Backup of GUSBCFG register
+ * @grxfsiz: Backup of GRXFSIZ register
+ * @gnptxfsiz: Backup of GNPTXFSIZ register
+ * @gi2cctl: Backup of GI2CCTL register
+ * @hptxfsiz: Backup of HPTXFSIZ register
+ * @gdfifocfg: Backup of GDFIFOCFG register
+ * @dtxfsiz: Backup of DTXFSIZ registers for each endpoint
+ * @gpwrdn: Backup of GPWRDN register
+ */
+struct dwc2_gregs_backup {
+ u32 gotgctl;
+ u32 gintmsk;
+ u32 gahbcfg;
+ u32 gusbcfg;
+ u32 grxfsiz;
+ u32 gnptxfsiz;
+ u32 gi2cctl;
+ u32 hptxfsiz;
+ u32 pcgcctl;
+ u32 gdfifocfg;
+ u32 dtxfsiz[MAX_EPS_CHANNELS];
+ u32 gpwrdn;
+};
+
+/**
+ * struct dwc2_dregs_backup - Holds device registers state before entering partial
+ * power down
+ * @dcfg: Backup of DCFG register
+ * @dctl: Backup of DCTL register
+ * @daintmsk: Backup of DAINTMSK register
+ * @diepmsk: Backup of DIEPMSK register
+ * @doepmsk: Backup of DOEPMSK register
+ * @diepctl: Backup of DIEPCTL register
+ * @dieptsiz: Backup of DIEPTSIZ register
+ * @diepdma: Backup of DIEPDMA register
+ * @doepctl: Backup of DOEPCTL register
+ * @doeptsiz: Backup of DOEPTSIZ register
+ * @doepdma: Backup of DOEPDMA register
+ */
+struct dwc2_dregs_backup {
+ u32 dcfg;
+ u32 dctl;
+ u32 daintmsk;
+ u32 diepmsk;
+ u32 doepmsk;
+ u32 diepctl[MAX_EPS_CHANNELS];
+ u32 dieptsiz[MAX_EPS_CHANNELS];
+ u32 diepdma[MAX_EPS_CHANNELS];
+ u32 doepctl[MAX_EPS_CHANNELS];
+ u32 doeptsiz[MAX_EPS_CHANNELS];
+ u32 doepdma[MAX_EPS_CHANNELS];
+};
+
+/**
+ * struct dwc2_hregs_backup - Holds host registers state before entering partial
+ * power down
+ * @hcfg: Backup of HCFG register
+ * @haintmsk: Backup of HAINTMSK register
+ * @hcintmsk: Backup of HCINTMSK register
+ * @hptr0: Backup of HPTR0 register
+ * @hfir: Backup of HFIR register
+ */
+struct dwc2_hregs_backup {
+ u32 hcfg;
+ u32 haintmsk;
+ u32 hcintmsk[MAX_EPS_CHANNELS];
+ u32 hprt0;
+ u32 hfir;
+};
+
+/**
* struct dwc2_hsotg - Holds the state of the driver, including the non-periodic
* and periodic schedules
*
@@ -481,6 +557,9 @@ struct dwc2_hw_params {
* interrupt
* @wkp_timer: Timer object for handling Wakeup Detected interrupt
* @lx_state: Lx state of connected device
+ * @gregs_backup: Backup of global registers during suspend
+ * @dregs_backup: Backup of device registers during suspend
+ * @hregs_backup: Backup of host registers during suspend
*
* These are for host mode:
*
@@ -613,6 +692,9 @@ struct dwc2_hsotg {
struct work_struct wf_otg;
struct timer_list wkp_timer;
enum dwc2_lx_state lx_state;
+ struct dwc2_gregs_backup *gr_backup;
+ struct dwc2_dregs_backup *dr_backup;
+ struct dwc2_hregs_backup *hr_backup;
struct dentry *debug_root;
struct debugfs_regset32 *regset;
@@ -749,6 +831,8 @@ enum dwc2_halt_status {
* and the DWC_otg controller
*/
extern void dwc2_core_host_init(struct dwc2_hsotg *hsotg);
+extern int dwc2_enter_hibernation(struct dwc2_hsotg *hsotg);
+extern int dwc2_exit_hibernation(struct dwc2_hsotg *hsotg, bool restore);
/*
* Host core Functions.
--
1.9.1
--
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