diff options
Diffstat (limited to 'arch/arm/cpu/armv7/mx5/clock.c')
| -rw-r--r-- | arch/arm/cpu/armv7/mx5/clock.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/mx5/clock.c b/arch/arm/cpu/armv7/mx5/clock.c index 8f8d01c26e..d769a4d772 100644 --- a/arch/arm/cpu/armv7/mx5/clock.c +++ b/arch/arm/cpu/armv7/mx5/clock.c @@ -399,6 +399,30 @@ u32 imx_get_fecclk(void) return mxc_get_clock(MXC_IPG_CLK); } +#ifdef CONFIG_MX53 +/* + * The clock for the external interface can be set to use internal clock + * if fuse bank 4, row 3, bit 2 is set. + * This is an undocumented feature and it was confirmed by Freescale's support: + * Fuses (but not pins) may be used to configure SATA clocks. + * Particularly the i.MX53 Fuse_Map contains the next information + * about configuring SATA clocks : SATA_ALT_REF_CLK[1:0] (offset 0x180C) + * '00' - 100MHz (External) + * '01' - 50MHz (External) + * '10' - 120MHz, internal (USB PHY) + * '11' - Reserved +*/ +void mxc_set_sata_internal_clock(void) +{ + u32 *tmp_base = + (u32 *)(IIM_BASE_ADDR + 0x180c); + + set_usb_phy1_clk(); + + writel((readl(tmp_base) & (~0x7)) | 0x4, tmp_base); +} +#endif + /* * Dump some core clockes. */ |