| Benoît Thébaudeau | 0f67e09 | 2013-04-23 10:17:41 +0000 | [diff] [blame] | 1 | Driver implementing the fuse API for Freescale's IC Identification Module (IIM) |
| 2 | |
| 3 | This IP can be found on the following SoCs: |
| 4 | - MPC512x, |
| 5 | - i.MX25, |
| 6 | - i.MX27, |
| 7 | - i.MX31, |
| 8 | - i.MX35, |
| 9 | - i.MX51, |
| 10 | - i.MX53. |
| 11 | |
| 12 | The section numbers in this file refer to the i.MX25 Reference Manual. |
| 13 | |
| 14 | A fuse word contains 8 fuse bit slots, as explained in 30.4.2.2.1. |
| 15 | |
| 16 | A bank contains 256 fuse word slots, as shown by the memory map in 30.3.1. |
| 17 | |
| 18 | Some fuse bit or word slots may not have the corresponding fuses actually |
| 19 | implemented in the fusebox. |
| 20 | |
| 21 | See the README files of the SoCs using this driver in order to know the |
| 22 | conventions used by U-Boot to store some specific data in the fuses, e.g. MAC |
| 23 | addresses. |
| 24 | |
| 25 | Fuse operations: |
| 26 | |
| 27 | Read |
| 28 | Read operations are implemented as read accesses to the shadow registers, |
| 29 | using "Word y of Bank x" from the register summary in 30.3.2. This is |
| 30 | explained in detail in 30.4.5.1. |
| 31 | |
| 32 | Sense |
| 33 | Sense operations are implemented as explained in 30.4.5.2. |
| 34 | |
| 35 | Program |
| 36 | Program operations are implemented as explained in 30.4.5.3. Following |
| 37 | this operation, the shadow registers are reloaded by the hardware (not |
| 38 | immediately, but this does not make any difference for a user reading |
| 39 | these registers). |
| 40 | |
| 41 | Override |
| 42 | Override operations are implemented as write accesses to the shadow |
| 43 | registers, as explained in 30.4.5.4. |
| 44 | |
| 45 | Configuration: |
| 46 | |
| 47 | CONFIG_FSL_IIM |
| 48 | Define this to enable the fsl_iim driver. |