1929cb34 |
1 | Clock framework on SuperH architecture |
2 | |
3 | The framework on SH extends existing API by the function clk_set_rate_ex, |
4 | which prototype is as follows: |
5 | |
6 | clk_set_rate_ex (struct clk *clk, unsigned long rate, int algo_id) |
7 | |
8 | The algo_id parameter is used to specify algorithm used to recalculate clocks, |
9 | adjanced to clock, specified as first argument. It is assumed that algo_id==0 |
10 | means no changes to adjanced clock |
11 | |
12 | Internally, the clk_set_rate_ex forwards request to clk->ops->set_rate method, |
13 | if it is present in ops structure. The method should set the clock rate and adjust |
14 | all needed clocks according to the passed algo_id. |
15 | Exact values for algo_id are machine-dependend. For the sh7722, the following |
16 | values are defined: |
17 | |
18 | NO_CHANGE = 0, |
19 | IUS_N1_N1, /* I:U = N:1, U:Sh = N:1 */ |
20 | IUS_322, /* I:U:Sh = 3:2:2 */ |
21 | IUS_522, /* I:U:Sh = 5:2:2 */ |
22 | IUS_N11, /* I:U:Sh = N:1:1 */ |
23 | SB_N1, /* Sh:B = N:1 */ |
24 | SB3_N1, /* Sh:B3 = N:1 */ |
25 | SB3_32, /* Sh:B3 = 3:2 */ |
26 | SB3_43, /* Sh:B3 = 4:3 */ |
27 | SB3_54, /* Sh:B3 = 5:4 */ |
28 | BP_N1, /* B:P = N:1 */ |
29 | IP_N1 /* I:P = N:1 */ |
30 | |
31 | Each of these constants means relation between clocks that can be set via the FRQCR |
32 | register |