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OMAP4: hwmod & CM: Implement the omap4_cm_wait_module_ready function 

The return of the omap4_cm_wait_module_ready function is checked
in order to avoid accessing the sysconfig register if the module is
not in the correct state.
In that case the _setup will exit without trying to reset
using sysconfig.
For the moment a warning is printed. A proper management of fclk
and module reset will have to be done in order to init correctly
the problematic IPs listed below.

  <4>omap_hwmod: ivahd: cannot be enabled (3)
  <4>omap_hwmod: iss: cannot be enabled (3)
  <4>omap_hwmod: tesla: cannot be enabled (3)
  <4>omap_hwmod: sdma: cannot be enabled (3)
  <4>omap_hwmod: sl2: cannot be enabled (3)
  <4>omap_hwmod: sad2d: cannot be enabled (3)
  <4>omap_hwmod: ducati: cannot be enabled (3)

Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Benoit Cousson 2010-05-20 12:31:08 -06:00 committed by Paul Walmsley
parent d9e6625c70
commit 9a23dfe128
3 changed files with 50 additions and 21 deletions
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2
arch/arm/mach-omap2/cm.h
View File

@ -112,7 +112,7 @@ extern u32 cm_rmw_mod_reg_bits(u32 mask, u32 bits, s16 module, s16 idx);
extern int omap2_cm_wait_module_ready(s16 prcm_mod, u8 idlest_id,
u8 idlest_shift);
extern int omap4_cm_wait_module_ready(u32 prcm_mod, u8 prcm_dev_offs);
extern int omap4_cm_wait_module_ready(void __iomem *clkctrl_reg);
static inline u32 cm_set_mod_reg_bits(u32 bits, s16 module, s16 idx)
{

36
arch/arm/mach-omap2/cm4xxx.c
View File

@ -21,19 +21,41 @@
#include <asm/atomic.h>
#include <plat/common.h>
#include "cm.h"
#include "cm-regbits-44xx.h"
/**
* omap4_cm_wait_idlest_ready - wait for a module to leave idle or standby
* @prcm_mod: PRCM module offset (XXX example)
* @prcm_dev_offs: PRCM device offset (e.g. MCASP XXX example)
* omap4_cm_wait_module_ready - wait for a module to be in 'func' state
* @clkctrl_reg: CLKCTRL module address
*
* XXX document
* Wait for the module IDLEST to be functional. If the idle state is in any
* the non functional state (trans, idle or disabled), module and thus the
* sysconfig cannot be accessed and will probably lead to an "imprecise
* external abort"
*
* Module idle state:
* 0x0 func: Module is fully functional, including OCP
* 0x1 trans: Module is performing transition: wakeup, or sleep, or sleep
* abortion
* 0x2 idle: Module is in Idle mode (only OCP part). It is functional if
* using separate functional clock
* 0x3 disabled: Module is disabled and cannot be accessed
*
* TODO: Need to handle module accessible in idle state
*/
int omap4_cm_wait_idlest_ready(u32 prcm_mod, u8 prcm_dev_offs)
int omap4_cm_wait_module_ready(void __iomem *clkctrl_reg)
{
/* FIXME: Add clock manager related code */
return 0;
int i = 0;
if (!clkctrl_reg)
return 0;
omap_test_timeout(((__raw_readl(clkctrl_reg) &
OMAP4430_IDLEST_MASK) == 0),
MAX_MODULE_READY_TIME, i);
return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
}

33
arch/arm/mach-omap2/omap_hwmod.c
View File

@ -819,11 +819,8 @@ static int _wait_target_ready(struct omap_hwmod *oh)
ret = omap2_cm_wait_module_ready(oh->prcm.omap2.module_offs,
oh->prcm.omap2.idlest_reg_id,
oh->prcm.omap2.idlest_idle_bit);
#if 0
} else if (cpu_is_omap44xx()) {
ret = omap4_cm_wait_module_ready(oh->prcm.omap4.module_offs,
oh->prcm.omap4.device_offs);
#endif
ret = omap4_cm_wait_module_ready(oh->prcm.omap4.clkctrl_reg);
} else {
BUG();
};
@ -912,16 +909,21 @@ static int _enable(struct omap_hwmod *oh)
_add_initiator_dep(oh, mpu_oh);
_enable_clocks(oh);
if (oh->class->sysc) {
if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
_update_sysc_cache(oh);
_sysc_enable(oh);
}
r = _wait_target_ready(oh);
if (!r)
if (!r) {
oh->_state = _HWMOD_STATE_ENABLED;
/* Access the sysconfig only if the target is ready */
if (oh->class->sysc) {
if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
_update_sysc_cache(oh);
_sysc_enable(oh);
}
} else {
pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
oh->name, r);
}
return r;
}
@ -999,7 +1001,7 @@ static int _shutdown(struct omap_hwmod *oh)
static int _setup(struct omap_hwmod *oh)
{
struct omap_hwmod_ocp_if *os;
int i;
int i, r;
if (!oh)
return -EINVAL;
@ -1023,7 +1025,12 @@ static int _setup(struct omap_hwmod *oh)
oh->_state = _HWMOD_STATE_INITIALIZED;
_enable(oh);
r = _enable(oh);
if (r) {
pr_warning("omap_hwmod: %s: cannot be enabled (%d)\n",
oh->name, oh->_state);
return 0;
}
if (!(oh->flags & HWMOD_INIT_NO_RESET)) {
/*