diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/sysdev/qe_lib/qe.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/arch/powerpc/sysdev/qe_lib/qe.c b/arch/powerpc/sysdev/qe_lib/qe.c index 3d57d3835b0..1df3b4a6832 100644 --- a/arch/powerpc/sysdev/qe_lib/qe.c +++ b/arch/powerpc/sysdev/qe_lib/qe.c @@ -167,19 +167,20 @@ unsigned int get_brg_clk(void) /* Program the BRG to the given sampling rate and multiplier * - * @brg: the BRG, 1-16 + * @brg: the BRG, QE_BRG1 - QE_BRG16 * @rate: the desired sampling rate * @multiplier: corresponds to the value programmed in GUMR_L[RDCR] or * GUMR_L[TDCR]. E.g., if this BRG is the RX clock, and GUMR_L[RDCR]=01, * then 'multiplier' should be 8. - * - * Also note that the value programmed into the BRGC register must be even. */ -void qe_setbrg(unsigned int brg, unsigned int rate, unsigned int multiplier) +int qe_setbrg(enum qe_clock brg, unsigned int rate, unsigned int multiplier) { u32 divisor, tempval; u32 div16 = 0; + if ((brg < QE_BRG1) || (brg > QE_BRG16)) + return -EINVAL; + divisor = get_brg_clk() / (rate * multiplier); if (divisor > QE_BRGC_DIVISOR_MAX + 1) { @@ -196,8 +197,11 @@ void qe_setbrg(unsigned int brg, unsigned int rate, unsigned int multiplier) tempval = ((divisor - 1) << QE_BRGC_DIVISOR_SHIFT) | QE_BRGC_ENABLE | div16; - out_be32(&qe_immr->brg.brgc[brg - 1], tempval); + out_be32(&qe_immr->brg.brgc[brg - QE_BRG1], tempval); + + return 0; } +EXPORT_SYMBOL(qe_setbrg); /* Initialize SNUMs (thread serial numbers) according to * QE Module Control chapter, SNUM table |