-int mxs_wait_mask_set(struct mxs_register_32 *reg, uint32_t mask, unsigned
- int timeout)
-{
- while (--timeout) {
- if ((readl(®->reg) & mask) == mask)
- break;
- udelay(1);
- }
-
- return !timeout;
-}
-
-int mxs_wait_mask_clr(struct mxs_register_32 *reg, uint32_t mask, unsigned
- int timeout)
-{
- while (--timeout) {
- if ((readl(®->reg) & mask) == 0)
- break;
- udelay(1);
- }
-
- return !timeout;
-}
-
-int mxs_reset_block(struct mxs_register_32 *reg)
-{
- /* Clear SFTRST */
- writel(MXS_BLOCK_SFTRST, ®->reg_clr);
-
- if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT))
- return 1;
-
- /* Clear CLKGATE */
- writel(MXS_BLOCK_CLKGATE, ®->reg_clr);
-
- /* Set SFTRST */
- writel(MXS_BLOCK_SFTRST, ®->reg_set);
-
- /* Wait for CLKGATE being set */
- if (mxs_wait_mask_set(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT))
- return 1;
-
- /* Clear SFTRST */
- writel(MXS_BLOCK_SFTRST, ®->reg_clr);
-
- if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT))
- return 1;
-
- /* Clear CLKGATE */
- writel(MXS_BLOCK_CLKGATE, ®->reg_clr);
-
- if (mxs_wait_mask_clr(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT))
- return 1;
-
- return 0;
-}
-
+/*
+ * This function will craft a jumptable at 0x0 which will redirect interrupt
+ * vectoring to proper location of U-Boot in RAM.
+ *
+ * The structure of the jumptable will be as follows:
+ * ldr pc, [pc, #0x18] ..... for each vector, thus repeated 8 times
+ * <destination address> ... for each previous ldr, thus also repeated 8 times
+ *
+ * The "ldr pc, [pc, #0x18]" instruction above loads address from memory at
+ * offset 0x18 from current value of PC register. Note that PC is already
+ * incremented by 4 when computing the offset, so the effective offset is
+ * actually 0x20, this the associated <destination address>. Loading the PC
+ * register with an address performs a jump to that address.
+ */