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31 ******************************************************************************/
32 /****************************************************************************/
36 * @addtogroup usbps_v2_4
39 * The implementation of the XUsbPs interface reset functionality
42 * MODIFICATION HISTORY:
44 * Ver Who Date Changes
45 * ----- ---- -------- -----------------------------------------------
46 * 1.05a kpc 10/10/10 first version
49 *****************************************************************************/
51 /***************************** Include Files ********************************/
55 #include "xparameters.h"
58 /************************** Constant Definitions ****************************/
59 #define XUSBPS_RESET_TIMEOUT 0xFFFFF
60 /**************************** Type Definitions ******************************/
62 /***************** Macros (Inline Functions) Definitions ********************/
64 /************************** Variable Definitions ****************************/
67 /************************** Function Prototypes *****************************/
70 /*****************************************************************************/
72 * This function perform the reset sequence to the given usbps interface by
73 * configuring the appropriate control bits in the usbps specifc registers.
74 * the usbps reset sequence involves the below steps
75 * Disbale the interrupts
76 * Clear the status registers
77 * Apply the reset command and wait for reset complete status
78 * Update the relevant control registers with reset values
79 * @param BaseAddress of the interface
85 ******************************************************************************/
86 void XUsbPs_ResetHw(u32 BaseAddress)
91 /* Host and device mode */
92 /* Disable the interrupts */
93 XUsbPs_WriteReg(BaseAddress,XUSBPS_IER_OFFSET,0x0);
94 /* Clear the interuupt status */
95 RegVal = XUsbPs_ReadReg(BaseAddress,XUSBPS_ISR_OFFSET);
96 XUsbPs_WriteReg(BaseAddress,XUSBPS_ISR_OFFSET,RegVal);
98 /* Perform the reset operation using USB CMD register */
99 RegVal = XUsbPs_ReadReg(BaseAddress,XUSBPS_CMD_OFFSET);
100 RegVal = RegVal | XUSBPS_CMD_RST_MASK;
101 XUsbPs_WriteReg(BaseAddress,XUSBPS_CMD_OFFSET,RegVal);
102 RegVal = XUsbPs_ReadReg(BaseAddress,XUSBPS_CMD_OFFSET);
103 /* Wait till the reset operation returns success */
105 * FIX ME: right now no indication to the caller or user about
108 while ((RegVal & XUSBPS_CMD_RST_MASK) && (Timeout < XUSBPS_RESET_TIMEOUT))
110 RegVal = XUsbPs_ReadReg(BaseAddress,XUSBPS_CMD_OFFSET);
113 /* Update periodic list base address register with reset value */
114 XUsbPs_WriteReg(BaseAddress,XUSBPS_LISTBASE_OFFSET,0x0);
115 /* Update async/endpoint list base address register with reset value */
116 XUsbPs_WriteReg(BaseAddress,XUSBPS_ASYNCLISTADDR_OFFSET,0x0);