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author | Paul Walmsley <paul@pwsan.com> | 2012-10-30 03:56:29 +0100 |
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committer | Paul Walmsley <paul@pwsan.com> | 2012-11-08 20:33:08 +0100 |
commit | c4ceedcb18cf7a06059482a3a1828b9aad9f78cf (patch) | |
tree | e9b5e9bb75aa84ea70159fa68e103a69518a1eee /arch/arm/mach-omap2/cm_common.c | |
parent | ARM: OMAP2xxx: APLL/CM: convert to use omap2_cm_wait_module_ready() (diff) | |
download | linux-c4ceedcb18cf7a06059482a3a1828b9aad9f78cf.tar.xz linux-c4ceedcb18cf7a06059482a3a1828b9aad9f78cf.zip |
ARM: OMAP2+: CM/clock: convert _omap2_module_wait_ready() to use SoC-independent CM functions
Convert the OMAP clock code's _omap2_module_wait_ready() to use
SoC-independent CM functions that are provided by the CM code, rather
than using a deprecated function from mach-omap2/prcm.c.
This facilitates the future conversion of the CM code to a driver, and
also removes a mach-omap2/prcm.c user. mach-omap2/prcm.c will be removed
by a subsequent patch.
Some modules have IDLEST registers that aren't in the CM module, such
as the AM3517 IDLEST bits. So we also need a fallback function for
these non-CM odd cases. Create a temporary one in mach-omap2/clock.c,
intended to exist until the SCM drivers are ready.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Tested-by: Vaibhav Hiremath <hvaibhav@ti.com>
Diffstat (limited to 'arch/arm/mach-omap2/cm_common.c')
-rw-r--r-- | arch/arm/mach-omap2/cm_common.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/cm_common.c b/arch/arm/mach-omap2/cm_common.c index 3246cef151dc..561969bb511e 100644 --- a/arch/arm/mach-omap2/cm_common.c +++ b/arch/arm/mach-omap2/cm_common.c @@ -26,6 +26,54 @@ static struct cm_ll_data null_cm_ll_data; static struct cm_ll_data *cm_ll_data = &null_cm_ll_data; /** + * cm_split_idlest_reg - split CM_IDLEST reg addr into its components + * @idlest_reg: CM_IDLEST* virtual address + * @prcm_inst: pointer to an s16 to return the PRCM instance offset + * @idlest_reg_id: pointer to a u8 to return the CM_IDLESTx register ID + * + * Given an absolute CM_IDLEST register address @idlest_reg, passes + * the PRCM instance offset and IDLEST register ID back to the caller + * via the @prcm_inst and @idlest_reg_id. Returns -EINVAL upon error, + * or 0 upon success. XXX This function is only needed until absolute + * register addresses are removed from the OMAP struct clk records. + */ +int cm_split_idlest_reg(void __iomem *idlest_reg, s16 *prcm_inst, + u8 *idlest_reg_id) +{ + if (!cm_ll_data->split_idlest_reg) { + WARN_ONCE(1, "cm: %s: no low-level function defined\n", + __func__); + return -EINVAL; + } + + return cm_ll_data->split_idlest_reg(idlest_reg, prcm_inst, + idlest_reg_id); +} + +/** + * cm_wait_module_ready - wait for a module to leave idle or standby + * @prcm_mod: PRCM module offset + * @idlest_id: CM_IDLESTx register ID (i.e., x = 1, 2, 3) + * @idlest_shift: shift of the bit in the CM_IDLEST* register to check + * + * Wait for the PRCM to indicate that the module identified by + * (@prcm_mod, @idlest_id, @idlest_shift) is clocked. Return 0 upon + * success, -EBUSY if the module doesn't enable in time, or -EINVAL if + * no per-SoC wait_module_ready() function pointer has been registered + * or if the idlest register is unknown on the SoC. + */ +int cm_wait_module_ready(s16 prcm_mod, u8 idlest_id, u8 idlest_shift) +{ + if (!cm_ll_data->wait_module_ready) { + WARN_ONCE(1, "cm: %s: no low-level function defined\n", + __func__); + return -EINVAL; + } + + return cm_ll_data->wait_module_ready(prcm_mod, idlest_id, idlest_shift); +} + +/** * cm_register - register per-SoC low-level data with the CM * @cld: low-level per-SoC OMAP CM data & function pointers to register * |