diff options
Diffstat (limited to 'drivers/usb/chipidea')
| -rw-r--r-- | drivers/usb/chipidea/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/usb/chipidea/ci_hdrc_msm.c | 50 |
2 files changed, 49 insertions, 2 deletions
diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig index 19c20eaa23f2..fc96f5cdcb5c 100644 --- a/drivers/usb/chipidea/Kconfig +++ b/drivers/usb/chipidea/Kconfig @@ -2,6 +2,7 @@ config USB_CHIPIDEA tristate "ChipIdea Highspeed Dual Role Controller" depends on ((USB_EHCI_HCD && USB_GADGET) || (USB_EHCI_HCD && !USB_GADGET) || (!USB_EHCI_HCD && USB_GADGET)) && HAS_DMA select EXTCON + select RESET_CONTROLLER help Say Y here if your system has a dual role high speed USB controller based on ChipIdea silicon IP. It supports: diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c index 2489a63d3e75..fe96df7b530c 100644 --- a/drivers/usb/chipidea/ci_hdrc_msm.c +++ b/drivers/usb/chipidea/ci_hdrc_msm.c @@ -14,6 +14,7 @@ #include <linux/mfd/syscon.h> #include <linux/regmap.h> #include <linux/io.h> +#include <linux/reset-controller.h> #include <linux/extcon.h> #include <linux/of.h> @@ -31,8 +32,10 @@ #define HSPHY_SESS_VLD_CTRL BIT(25) /* Vendor base starts at 0x200 beyond CI base */ +#define HS_PHY_CTRL 0x0040 #define HS_PHY_SEC_CTRL 0x0078 #define HS_PHY_DIG_CLAMP_N BIT(16) +#define HS_PHY_POR_ASSERT BIT(0) struct ci_hdrc_msm { struct platform_device *ci; @@ -40,11 +43,43 @@ struct ci_hdrc_msm { struct clk *iface_clk; struct clk *fs_clk; struct ci_hdrc_platform_data pdata; + struct reset_controller_dev rcdev; bool secondary_phy; bool hsic; void __iomem *base; }; +static int +ci_hdrc_msm_por_reset(struct reset_controller_dev *r, unsigned long id) +{ + struct ci_hdrc_msm *ci_msm = container_of(r, struct ci_hdrc_msm, rcdev); + void __iomem *addr = ci_msm->base; + u32 val; + + if (id) + addr += HS_PHY_SEC_CTRL; + else + addr += HS_PHY_CTRL; + + val = readl_relaxed(addr); + val |= HS_PHY_POR_ASSERT; + writel(val, addr); + /* + * wait for minimum 10 microseconds as suggested by manual. + * Use a slightly larger value since the exact value didn't + * work 100% of the time. + */ + udelay(12); + val &= ~HS_PHY_POR_ASSERT; + writel(val, addr); + + return 0; +} + +static const struct reset_control_ops ci_hdrc_msm_reset_ops = { + .reset = ci_hdrc_msm_por_reset, +}; + static void ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event) { struct device *dev = ci->dev->parent; @@ -186,10 +221,18 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev) if (!ci->base) return -ENOMEM; - ret = clk_prepare_enable(ci->fs_clk); + ci->rcdev.owner = THIS_MODULE; + ci->rcdev.ops = &ci_hdrc_msm_reset_ops; + ci->rcdev.of_node = pdev->dev.of_node; + ci->rcdev.nr_resets = 2; + ret = reset_controller_register(&ci->rcdev); if (ret) return ret; + ret = clk_prepare_enable(ci->fs_clk); + if (ret) + goto err_fs; + reset_control_assert(reset); usleep_range(10000, 12000); reset_control_deassert(reset); @@ -198,7 +241,7 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev) ret = clk_prepare_enable(ci->core_clk); if (ret) - return ret; + goto err_fs; ret = clk_prepare_enable(ci->iface_clk); if (ret) @@ -236,6 +279,8 @@ err_mux: clk_disable_unprepare(ci->iface_clk); err_iface: clk_disable_unprepare(ci->core_clk); +err_fs: + reset_controller_unregister(&ci->rcdev); return ret; } @@ -247,6 +292,7 @@ static int ci_hdrc_msm_remove(struct platform_device *pdev) ci_hdrc_remove_device(ci->ci); clk_disable_unprepare(ci->iface_clk); clk_disable_unprepare(ci->core_clk); + reset_controller_unregister(&ci->rcdev); return 0; } |