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| * |
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| ******************************************************************************/ |
| /****************************************************************************/ |
| /** |
| * |
| * @file xusbps_hw.c |
| * @addtogroup usbps_v2_2 |
| * @{ |
| * |
| * The implementation of the XUsbPs interface reset functionality |
| * |
| * <pre> |
| * MODIFICATION HISTORY: |
| * |
| * Ver Who Date Changes |
| * ----- ---- -------- ----------------------------------------------- |
| * 1.05a kpc 10/10/10 first version |
| * </pre> |
| * |
| *****************************************************************************/ |
| |
| /***************************** Include Files ********************************/ |
| |
| #include "xstatus.h" |
| #include "xusbps.h" |
| #include "xparameters.h" |
| |
| |
| /************************** Constant Definitions ****************************/ |
| #define XUSBPS_RESET_TIMEOUT 0xFFFFF |
| /**************************** Type Definitions ******************************/ |
| |
| /***************** Macros (Inline Functions) Definitions ********************/ |
| |
| /************************** Variable Definitions ****************************/ |
| |
| |
| /************************** Function Prototypes *****************************/ |
| |
| |
| /*****************************************************************************/ |
| /** |
| * This function perform the reset sequence to the given usbps interface by |
| * configuring the appropriate control bits in the usbps specifc registers. |
| * the usbps reset sequence involves the below steps |
| * Disbale the interrupts |
| * Clear the status registers |
| * Apply the reset command and wait for reset complete status |
| * Update the relevant control registers with reset values |
| * @param BaseAddress of the interface |
| * |
| * @return N/A. |
| * |
| * @note None. |
| * |
| ******************************************************************************/ |
| void XUsbPs_ResetHw(u32 BaseAddress) |
| { |
| u32 RegVal; |
| u32 Timeout = 0; |
| |
| /* Host and device mode */ |
| /* Disable the interrupts */ |
| XUsbPs_WriteReg(BaseAddress,XUSBPS_IER_OFFSET,0x0); |
| /* Clear the interuupt status */ |
| RegVal = XUsbPs_ReadReg(BaseAddress,XUSBPS_ISR_OFFSET); |
| XUsbPs_WriteReg(BaseAddress,XUSBPS_ISR_OFFSET,RegVal); |
| |
| /* Perform the reset operation using USB CMD register */ |
| RegVal = XUsbPs_ReadReg(BaseAddress,XUSBPS_CMD_OFFSET); |
| RegVal = RegVal | XUSBPS_CMD_RST_MASK; |
| XUsbPs_WriteReg(BaseAddress,XUSBPS_CMD_OFFSET,RegVal); |
| RegVal = XUsbPs_ReadReg(BaseAddress,XUSBPS_CMD_OFFSET); |
| /* Wait till the reset operation returns success */ |
| /* |
| * FIX ME: right now no indication to the caller or user about |
| * timeout overflow |
| */ |
| while ((RegVal & XUSBPS_CMD_RST_MASK) && (Timeout < XUSBPS_RESET_TIMEOUT)) |
| { |
| RegVal = XUsbPs_ReadReg(BaseAddress,XUSBPS_CMD_OFFSET); |
| Timeout++; |
| } |
| /* Update periodic list base address register with reset value */ |
| XUsbPs_WriteReg(BaseAddress,XUSBPS_LISTBASE_OFFSET,0x0); |
| /* Update async/endpoint list base address register with reset value */ |
| XUsbPs_WriteReg(BaseAddress,XUSBPS_ASYNCLISTADDR_OFFSET,0x0); |
| |
| } |
| |
| |
| |
| /** @} */ |
