3.11.10.4 -stable review patch. If anyone has any objections, please let me know.
------------------ From: Peter Chen <[email protected]> commit ed8f8318d2ef3e5f9e4ddf79349508c116b68d7f upstream. According to Freescale imx28 Errata, "ENGR119653 USB: ARM to USB register error issue", All USB register write operations must use the ARM SWP instruction. So, we implement special hw_write and hw_test_and_clear for imx28. Discussion for it at below: http://marc.info/?l=linux-usb&m=137996395529294&w=2 This patch is needed for stable tree 3.11+. Cc: [email protected] Signed-off-by: Peter Chen <[email protected]> Signed-off-by: Marc Kleine-Budde <[email protected]> Tested-by: Marc Kleine-Budde <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> [ luis: backported to 3.11: adjusted context ] Signed-off-by: Luis Henriques <[email protected]> --- drivers/usb/chipidea/ci.h | 26 ++++++++++++++++++++++++-- drivers/usb/chipidea/core.c | 2 ++ drivers/usb/chipidea/host.c | 1 + include/linux/usb/chipidea.h | 1 + 4 files changed, 28 insertions(+), 2 deletions(-) diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h index 33cb29f..7a36c23 100644 --- a/drivers/usb/chipidea/ci.h +++ b/drivers/usb/chipidea/ci.h @@ -132,6 +132,7 @@ struct hw_bank { * @transceiver: pointer to USB PHY, if any * @hcd: pointer to usb_hcd for ehci host driver * @debugfs: root dentry for this controller in debugfs + * @imx28_write_fix: Freescale imx28 needs swp instruction for writing */ struct ci_hdrc { struct device *dev; @@ -168,6 +169,7 @@ struct ci_hdrc { struct usb_phy *transceiver; struct usb_hcd *hcd; struct dentry *debugfs; + bool imx28_write_fix; }; static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci) @@ -248,6 +250,26 @@ static inline u32 hw_read(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask) return ioread32(ci->hw_bank.regmap[reg]) & mask; } +#ifdef CONFIG_SOC_IMX28 +static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr) +{ + __asm__ ("swp %0, %0, [%1]" : : "r"(val), "r"(addr)); +} +#else +static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr) +{ +} +#endif + +static inline void __hw_write(struct ci_hdrc *ci, u32 val, + void __iomem *addr) +{ + if (ci->imx28_write_fix) + imx28_ci_writel(val, addr); + else + iowrite32(val, addr); +} + /** * hw_write: writes to a hw register * @reg: register index @@ -261,7 +283,7 @@ static inline void hw_write(struct ci_hdrc *ci, enum ci_hw_regs reg, data = (ioread32(ci->hw_bank.regmap[reg]) & ~mask) | (data & mask); - iowrite32(data, ci->hw_bank.regmap[reg]); + __hw_write(ci, data, ci->hw_bank.regmap[reg]); } /** @@ -276,7 +298,7 @@ static inline u32 hw_test_and_clear(struct ci_hdrc *ci, enum ci_hw_regs reg, { u32 val = ioread32(ci->hw_bank.regmap[reg]) & mask; - iowrite32(val, ci->hw_bank.regmap[reg]); + __hw_write(ci, val, ci->hw_bank.regmap[reg]); return val; } diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c index a5df24c..f698637 100644 --- a/drivers/usb/chipidea/core.c +++ b/drivers/usb/chipidea/core.c @@ -432,6 +432,8 @@ static int ci_hdrc_probe(struct platform_device *pdev) ci->transceiver = ci->platdata->phy; else ci->global_phy = true; + ci->imx28_write_fix = !!(ci->platdata->flags & + CI_HDRC_IMX28_WRITE_FIX); ret = hw_device_init(ci, base); if (ret < 0) { diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c index 40d0fda..309c4ab 100644 --- a/drivers/usb/chipidea/host.c +++ b/drivers/usb/chipidea/host.c @@ -63,6 +63,7 @@ static int host_start(struct ci_hdrc *ci) ehci = hcd_to_ehci(hcd); ehci->caps = ci->hw_bank.cap; ehci->has_hostpc = ci->hw_bank.lpm; + ehci->imx28_write_fix = ci->imx28_write_fix; ret = usb_add_hcd(hcd, 0, 0); if (ret) diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h index 2562994..2196bc1 100644 --- a/include/linux/usb/chipidea.h +++ b/include/linux/usb/chipidea.h @@ -20,6 +20,7 @@ struct ci_hdrc_platform_data { #define CI_HDRC_REQUIRE_TRANSCEIVER BIT(1) #define CI_HDRC_PULLUP_ON_VBUS BIT(2) #define CI_HDRC_DISABLE_STREAMING BIT(3) +#define CI_HDRC_IMX28_WRITE_FIX BIT(5) enum usb_dr_mode dr_mode; #define CI_HDRC_CONTROLLER_RESET_EVENT 0 #define CI_HDRC_CONTROLLER_STOPPED_EVENT 1 -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
