/*
* omap_hwmod implementation for OMAP2/3/4
*
- * Copyright (C) 2009 Nokia Corporation
+ * Copyright (C) 2009-2010 Nokia Corporation
*
* Paul Walmsley, Benoît Cousson, Kevin Hilman
*
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
- * This code manages "OMAP modules" (on-chip devices) and their
- * integration with Linux device driver and bus code.
- *
- * References:
+ * Introduction
+ * ------------
+ * One way to view an OMAP SoC is as a collection of largely unrelated
+ * IP blocks connected by interconnects. The IP blocks include
+ * devices such as ARM processors, audio serial interfaces, UARTs,
+ * etc. Some of these devices, like the DSP, are created by TI;
+ * others, like the SGX, largely originate from external vendors. In
+ * TI's documentation, on-chip devices are referred to as "OMAP
+ * modules." Some of these IP blocks are identical across several
+ * OMAP versions. Others are revised frequently.
+ *
+ * These OMAP modules are tied together by various interconnects.
+ * Most of the address and data flow between modules is via OCP-based
+ * interconnects such as the L3 and L4 buses; but there are other
+ * interconnects that distribute the hardware clock tree, handle idle
+ * and reset signaling, supply power, and connect the modules to
+ * various pads or balls on the OMAP package.
+ *
+ * OMAP hwmod provides a consistent way to describe the on-chip
+ * hardware blocks and their integration into the rest of the chip.
+ * This description can be automatically generated from the TI
+ * hardware database. OMAP hwmod provides a standard, consistent API
+ * to reset, enable, idle, and disable these hardware blocks. And
+ * hwmod provides a way for other core code, such as the Linux device
+ * code or the OMAP power management and address space mapping code,
+ * to query the hardware database.
+ *
+ * Using hwmod
+ * -----------
+ * Drivers won't call hwmod functions directly. That is done by the
+ * omap_device code, and in rare occasions, by custom integration code
+ * in arch/arm/ *omap*. The omap_device code includes functions to
+ * build a struct platform_device using omap_hwmod data, and that is
+ * currently how hwmod data is communicated to drivers and to the
+ * Linux driver model. Most drivers will call omap_hwmod functions only
+ * indirectly, via pm_runtime*() functions.
+ *
+ * From a layering perspective, here is where the OMAP hwmod code
+ * fits into the kernel software stack:
+ *
+ * +-------------------------------+
+ * | Device driver code |
+ * | (e.g., drivers/) |
+ * +-------------------------------+
+ * | Linux driver model |
+ * | (platform_device / |
+ * | platform_driver data/code) |
+ * +-------------------------------+
+ * | OMAP core-driver integration |
+ * |(arch/arm/mach-omap2/devices.c)|
+ * +-------------------------------+
+ * | omap_device code |
+ * | (../plat-omap/omap_device.c) |
+ * +-------------------------------+
+ * ----> | omap_hwmod code/data | <-----
+ * | (../mach-omap2/omap_hwmod*) |
+ * +-------------------------------+
+ * | OMAP clock/PRCM/register fns |
+ * | (__raw_{read,write}l, clk*) |
+ * +-------------------------------+
+ *
+ * Device drivers should not contain any OMAP-specific code or data in
+ * them. They should only contain code to operate the IP block that
+ * the driver is responsible for. This is because these IP blocks can
+ * also appear in other SoCs, either from TI (such as DaVinci) or from
+ * other manufacturers; and drivers should be reusable across other
+ * platforms.
+ *
+ * The OMAP hwmod code also will attempt to reset and idle all on-chip
+ * devices upon boot. The goal here is for the kernel to be
+ * completely self-reliant and independent from bootloaders. This is
+ * to ensure a repeatable configuration, both to ensure consistent
+ * runtime behavior, and to make it easier for others to reproduce
+ * bugs.
+ *
+ * OMAP module activity states
+ * ---------------------------
+ * The hwmod code considers modules to be in one of several activity
+ * states. IP blocks start out in an UNKNOWN state, then once they
+ * are registered via the hwmod code, proceed to the REGISTERED state.
+ * Once their clock names are resolved to clock pointers, the module
+ * enters the CLKS_INITED state; and finally, once the module has been
+ * reset and the integration registers programmed, the INITIALIZED state
+ * is entered. The hwmod code will then place the module into either
+ * the IDLE state to save power, or in the case of a critical system
+ * module, the ENABLED state.
+ *
+ * OMAP core integration code can then call omap_hwmod*() functions
+ * directly to move the module between the IDLE, ENABLED, and DISABLED
+ * states, as needed. This is done during both the PM idle loop, and
+ * in the OMAP core integration code's implementation of the PM runtime
+ * functions.
+ *
+ * References
+ * ----------
+ * This is a partial list.
* - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
* - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
* - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
#include <plat/powerdomain.h>
#include <plat/clock.h>
#include <plat/omap_hwmod.h>
+#include <plat/prcm.h>
#include "cm.h"
+#include "prm.h"
-/* Maximum microseconds to wait for OMAP module to reset */
-#define MAX_MODULE_RESET_WAIT 10000
+/* Maximum microseconds to wait for OMAP module to softreset */
+#define MAX_MODULE_SOFTRESET_WAIT 10000
/* Name of the OMAP hwmod for the MPU */
#define MPU_INITIATOR_NAME "mpu"
/* XXX ensure module interface clock is up */
- oh->_sysc_cache = omap_hwmod_readl(oh, oh->class->sysc->sysc_offs);
+ oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
if (oh->_sysc_cache != v) {
oh->_sysc_cache = v;
- omap_hwmod_writel(v, oh, oh->class->sysc->sysc_offs);
+ omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
}
}
}
/**
- * _init_interface_clk - get a struct clk * for the the hwmod's interface clks
+ * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
* @oh: struct omap_hwmod *
*
* Called from _init_clocks(). Populates the @oh OCP slave interface
return 0;
}
+static void _enable_optional_clocks(struct omap_hwmod *oh)
+{
+ struct omap_hwmod_opt_clk *oc;
+ int i;
+
+ pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
+
+ for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
+ if (oc->_clk) {
+ pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
+ oc->_clk->name);
+ clk_enable(oc->_clk);
+ }
+}
+
+static void _disable_optional_clocks(struct omap_hwmod *oh)
+{
+ struct omap_hwmod_opt_clk *oc;
+ int i;
+
+ pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
+
+ for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
+ if (oc->_clk) {
+ pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
+ oc->_clk->name);
+ clk_disable(oc->_clk);
+ }
+}
+
/**
* _find_mpu_port_index - find hwmod OCP slave port ID intended for MPU use
* @oh: struct omap_hwmod *
}
/**
- * _sysc_enable - try to bring a module out of idle via OCP_SYSCONFIG
+ * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
* @oh: struct omap_hwmod *
*
* If module is marked as SWSUP_SIDLE, force the module out of slave
* as SWSUP_MSUSPEND, force the module out of master standby;
* otherwise, configure it for smart-standby. No return value.
*/
-static void _sysc_enable(struct omap_hwmod *oh)
+static void _enable_sysc(struct omap_hwmod *oh)
{
u8 idlemode, sf;
u32 v;
_set_master_standbymode(oh, idlemode, &v);
}
- if (sf & SYSC_HAS_AUTOIDLE) {
- idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
- 0 : 1;
- _set_module_autoidle(oh, idlemode, &v);
- }
-
- /* XXX OCP ENAWAKEUP bit? */
-
/*
* XXX The clock framework should handle this, by
* calling into this code. But this must wait until the
_set_clockactivity(oh, oh->class->sysc->clockact, &v);
_write_sysconfig(v, oh);
+
+ /* If slave is in SMARTIDLE, also enable wakeup */
+ if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
+ _enable_wakeup(oh);
+
+ /*
+ * Set the autoidle bit only after setting the smartidle bit
+ * Setting this will not have any impact on the other modules.
+ */
+ if (sf & SYSC_HAS_AUTOIDLE) {
+ idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
+ 0 : 1;
+ _set_module_autoidle(oh, idlemode, &v);
+ _write_sysconfig(v, oh);
+ }
}
/**
- * _sysc_idle - try to put a module into idle via OCP_SYSCONFIG
+ * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
* @oh: struct omap_hwmod *
*
* If module is marked as SWSUP_SIDLE, force the module into slave
* as SWSUP_MSUSPEND, force the module into master standby; otherwise,
* configure it for smart-standby. No return value.
*/
-static void _sysc_idle(struct omap_hwmod *oh)
+static void _idle_sysc(struct omap_hwmod *oh)
{
u8 idlemode, sf;
u32 v;
}
/**
- * _sysc_shutdown - force a module into idle via OCP_SYSCONFIG
+ * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
* @oh: struct omap_hwmod *
*
* Force the module into slave idle and master suspend. No return
* value.
*/
-static void _sysc_shutdown(struct omap_hwmod *oh)
+static void _shutdown_sysc(struct omap_hwmod *oh)
{
u32 v;
u8 sf;
/**
* _init_clocks - clk_get() all clocks associated with this hwmod
* @oh: struct omap_hwmod *
+ * @data: not used; pass NULL
*
* Called by omap_hwmod_late_init() (after omap2_clk_init()).
- * Resolves all clock names embedded in the hwmod. Must be called
- * with omap_hwmod_mutex held. Returns -EINVAL if the omap_hwmod
- * has not yet been registered or if the clocks have already been
- * initialized, 0 on success, or a non-zero error on failure.
+ * Resolves all clock names embedded in the hwmod. Returns -EINVAL if
+ * the omap_hwmod has not yet been registered or if the clocks have
+ * already been initialized, 0 on success, or a non-zero error on
+ * failure.
*/
-static int _init_clocks(struct omap_hwmod *oh)
+static int _init_clocks(struct omap_hwmod *oh, void *data)
{
int ret = 0;
return ret;
}
+/**
+ * _lookup_hardreset - return the register bit shift for this hwmod/reset line
+ * @oh: struct omap_hwmod *
+ * @name: name of the reset line in the context of this hwmod
+ *
+ * Return the bit position of the reset line that match the
+ * input name. Return -ENOENT if not found.
+ */
+static u8 _lookup_hardreset(struct omap_hwmod *oh, const char *name)
+{
+ int i;
+
+ for (i = 0; i < oh->rst_lines_cnt; i++) {
+ const char *rst_line = oh->rst_lines[i].name;
+ if (!strcmp(rst_line, name)) {
+ u8 shift = oh->rst_lines[i].rst_shift;
+ pr_debug("omap_hwmod: %s: _lookup_hardreset: %s: %d\n",
+ oh->name, rst_line, shift);
+
+ return shift;
+ }
+ }
+
+ return -ENOENT;
+}
+
+/**
+ * _assert_hardreset - assert the HW reset line of submodules
+ * contained in the hwmod module.
+ * @oh: struct omap_hwmod *
+ * @name: name of the reset line to lookup and assert
+ *
+ * Some IP like dsp, ipu or iva contain processor that require
+ * an HW reset line to be assert / deassert in order to enable fully
+ * the IP.
+ */
+static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
+{
+ u8 shift;
+
+ if (!oh)
+ return -EINVAL;
+
+ shift = _lookup_hardreset(oh, name);
+ if (IS_ERR_VALUE(shift))
+ return shift;
+
+ if (cpu_is_omap24xx() || cpu_is_omap34xx())
+ return omap2_prm_assert_hardreset(oh->prcm.omap2.module_offs,
+ shift);
+ else if (cpu_is_omap44xx())
+ return omap4_prm_assert_hardreset(oh->prcm.omap4.rstctrl_reg,
+ shift);
+ else
+ return -EINVAL;
+}
+
+/**
+ * _deassert_hardreset - deassert the HW reset line of submodules contained
+ * in the hwmod module.
+ * @oh: struct omap_hwmod *
+ * @name: name of the reset line to look up and deassert
+ *
+ * Some IP like dsp, ipu or iva contain processor that require
+ * an HW reset line to be assert / deassert in order to enable fully
+ * the IP.
+ */
+static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
+{
+ u8 shift;
+ int r;
+
+ if (!oh)
+ return -EINVAL;
+
+ shift = _lookup_hardreset(oh, name);
+ if (IS_ERR_VALUE(shift))
+ return shift;
+
+ if (cpu_is_omap24xx() || cpu_is_omap34xx())
+ r = omap2_prm_deassert_hardreset(oh->prcm.omap2.module_offs,
+ shift);
+ else if (cpu_is_omap44xx())
+ r = omap4_prm_deassert_hardreset(oh->prcm.omap4.rstctrl_reg,
+ shift);
+ else
+ return -EINVAL;
+
+ if (r == -EBUSY)
+ pr_warning("omap_hwmod: %s: failed to hardreset\n", oh->name);
+
+ return r;
+}
+
+/**
+ * _read_hardreset - read the HW reset line state of submodules
+ * contained in the hwmod module
+ * @oh: struct omap_hwmod *
+ * @name: name of the reset line to look up and read
+ *
+ * Return the state of the reset line.
+ */
+static int _read_hardreset(struct omap_hwmod *oh, const char *name)
+{
+ u8 shift;
+
+ if (!oh)
+ return -EINVAL;
+
+ shift = _lookup_hardreset(oh, name);
+ if (IS_ERR_VALUE(shift))
+ return shift;
+
+ if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
+ return omap2_prm_is_hardreset_asserted(oh->prcm.omap2.module_offs,
+ shift);
+ } else if (cpu_is_omap44xx()) {
+ return omap4_prm_is_hardreset_asserted(oh->prcm.omap4.rstctrl_reg,
+ shift);
+ } else {
+ return -EINVAL;
+ }
+}
+
/**
* _reset - reset an omap_hwmod
* @oh: struct omap_hwmod *
*
* Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
- * enabled for this to work. Must be called with omap_hwmod_mutex
- * held. Returns -EINVAL if the hwmod cannot be reset this way or if
- * the hwmod is in the wrong state, -ETIMEDOUT if the module did not
- * reset in time, or 0 upon success.
+ * enabled for this to work. Returns -EINVAL if the hwmod cannot be
+ * reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
+ * the module did not reset in time, or 0 upon success.
+ *
+ * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
+ * Starting in OMAP4, some IPs does not have SYSSTATUS register and instead
+ * use the SYSCONFIG softreset bit to provide the status.
+ *
+ * Note that some IP like McBSP does have a reset control but no reset status.
*/
static int _reset(struct omap_hwmod *oh)
{
- u32 r, v;
+ u32 v;
int c = 0;
+ int ret = 0;
if (!oh->class->sysc ||
- !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET) ||
- (oh->class->sysc->sysc_flags & SYSS_MISSING))
+ !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
return -EINVAL;
/* clocks must be on for this operation */
if (oh->_state != _HWMOD_STATE_ENABLED) {
- WARN(1, "omap_hwmod: %s: reset can only be entered from "
- "enabled state\n", oh->name);
+ pr_warning("omap_hwmod: %s: reset can only be entered from "
+ "enabled state\n", oh->name);
return -EINVAL;
}
+ /* For some modules, all optionnal clocks need to be enabled as well */
+ if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
+ _enable_optional_clocks(oh);
+
pr_debug("omap_hwmod: %s: resetting\n", oh->name);
v = oh->_sysc_cache;
- r = _set_softreset(oh, &v);
- if (r)
- return r;
+ ret = _set_softreset(oh, &v);
+ if (ret)
+ goto dis_opt_clks;
_write_sysconfig(v, oh);
- omap_test_timeout((omap_hwmod_readl(oh, oh->class->sysc->syss_offs) &
- SYSS_RESETDONE_MASK),
- MAX_MODULE_RESET_WAIT, c);
-
- if (c == MAX_MODULE_RESET_WAIT)
- WARN(1, "omap_hwmod: %s: failed to reset in %d usec\n",
- oh->name, MAX_MODULE_RESET_WAIT);
+ if (oh->class->sysc->sysc_flags & SYSS_HAS_RESET_STATUS)
+ omap_test_timeout((omap_hwmod_read(oh,
+ oh->class->sysc->syss_offs)
+ & SYSS_RESETDONE_MASK),
+ MAX_MODULE_SOFTRESET_WAIT, c);
+ else if (oh->class->sysc->sysc_flags & SYSC_HAS_RESET_STATUS)
+ omap_test_timeout(!(omap_hwmod_read(oh,
+ oh->class->sysc->sysc_offs)
+ & SYSC_TYPE2_SOFTRESET_MASK),
+ MAX_MODULE_SOFTRESET_WAIT, c);
+
+ if (c == MAX_MODULE_SOFTRESET_WAIT)
+ pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
+ oh->name, MAX_MODULE_SOFTRESET_WAIT);
else
- pr_debug("omap_hwmod: %s: reset in %d usec\n", oh->name, c);
+ pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
/*
* XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
* _wait_target_ready() or _reset()
*/
- return (c == MAX_MODULE_RESET_WAIT) ? -ETIMEDOUT : 0;
+ ret = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
+
+dis_opt_clks:
+ if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
+ _disable_optional_clocks(oh);
+
+ return ret;
}
/**
- * _enable - enable an omap_hwmod
+ * _omap_hwmod_enable - enable an omap_hwmod
* @oh: struct omap_hwmod *
*
* Enables an omap_hwmod @oh such that the MPU can access the hwmod's
- * register target. Must be called with omap_hwmod_mutex held.
- * Returns -EINVAL if the hwmod is in the wrong state or passes along
- * the return value of _wait_target_ready().
+ * register target. (This function has a full name --
+ * _omap_hwmod_enable() rather than simply _enable() -- because it is
+ * currently required by the pm34xx.c idle loop.) Returns -EINVAL if
+ * the hwmod is in the wrong state or passes along the return value of
+ * _wait_target_ready().
*/
-static int _enable(struct omap_hwmod *oh)
+int _omap_hwmod_enable(struct omap_hwmod *oh)
{
int r;
pr_debug("omap_hwmod: %s: enabling\n", oh->name);
+ /*
+ * If an IP contains only one HW reset line, then de-assert it in order
+ * to allow to enable the clocks. Otherwise the PRCM will return
+ * Intransition status, and the init will failed.
+ */
+ if ((oh->_state == _HWMOD_STATE_INITIALIZED ||
+ oh->_state == _HWMOD_STATE_DISABLED) && oh->rst_lines_cnt == 1)
+ _deassert_hardreset(oh, oh->rst_lines[0].name);
+
/* XXX mux balls */
_add_initiator_dep(oh, mpu_oh);
if (oh->class->sysc) {
if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
_update_sysc_cache(oh);
- _sysc_enable(oh);
+ _enable_sysc(oh);
}
} else {
pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
}
/**
- * _idle - idle an omap_hwmod
+ * _omap_hwmod_idle - idle an omap_hwmod
* @oh: struct omap_hwmod *
*
* Idles an omap_hwmod @oh. This should be called once the hwmod has
- * no further work. Returns -EINVAL if the hwmod is in the wrong
- * state or returns 0.
+ * no further work. (This function has a full name --
+ * _omap_hwmod_idle() rather than simply _idle() -- because it is
+ * currently required by the pm34xx.c idle loop.) Returns -EINVAL if
+ * the hwmod is in the wrong state or returns 0.
*/
-static int _idle(struct omap_hwmod *oh)
+int _omap_hwmod_idle(struct omap_hwmod *oh)
{
if (oh->_state != _HWMOD_STATE_ENABLED) {
WARN(1, "omap_hwmod: %s: idle state can only be entered from "
pr_debug("omap_hwmod: %s: idling\n", oh->name);
if (oh->class->sysc)
- _sysc_idle(oh);
+ _idle_sysc(oh);
_del_initiator_dep(oh, mpu_oh);
_disable_clocks(oh);
pr_debug("omap_hwmod: %s: disabling\n", oh->name);
if (oh->class->sysc)
- _sysc_shutdown(oh);
- _del_initiator_dep(oh, mpu_oh);
- /* XXX what about the other system initiators here? DMA, tesla, d2d */
- _disable_clocks(oh);
+ _shutdown_sysc(oh);
+
+ /*
+ * If an IP contains only one HW reset line, then assert it
+ * before disabling the clocks and shutting down the IP.
+ */
+ if (oh->rst_lines_cnt == 1)
+ _assert_hardreset(oh, oh->rst_lines[0].name);
+
+ /* clocks and deps are already disabled in idle */
+ if (oh->_state == _HWMOD_STATE_ENABLED) {
+ _del_initiator_dep(oh, mpu_oh);
+ /* XXX what about the other system initiators here? dma, dsp */
+ _disable_clocks(oh);
+ }
/* XXX Should this code also force-disable the optional clocks? */
/* XXX mux any associated balls to safe mode */
/**
* _setup - do initial configuration of omap_hwmod
* @oh: struct omap_hwmod *
+ * @skip_setup_idle_p: do not idle hwmods at the end of the fn if 1
*
* Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh
- * OCP_SYSCONFIG register. Must be called with omap_hwmod_mutex
- * held. Returns -EINVAL if the hwmod is in the wrong state or returns
- * 0.
+ * OCP_SYSCONFIG register. @skip_setup_idle is intended to be used on
+ * a system that will not call omap_hwmod_enable() to enable devices
+ * (e.g., a system without PM runtime). Returns -EINVAL if the hwmod
+ * is in the wrong state or returns 0.
*/
-static int _setup(struct omap_hwmod *oh)
+static int _setup(struct omap_hwmod *oh, void *data)
{
int i, r;
+ u8 skip_setup_idle;
- if (!oh)
+ if (!oh || !data)
return -EINVAL;
+ skip_setup_idle = *(u8 *)data;
+
/* Set iclk autoidle mode */
if (oh->slaves_cnt > 0) {
for (i = 0; i < oh->slaves_cnt; i++) {
}
}
+ mutex_init(&oh->_mutex);
oh->_state = _HWMOD_STATE_INITIALIZED;
- r = _enable(oh);
+ /*
+ * In the case of hwmod with hardreset that should not be
+ * de-assert at boot time, we have to keep the module
+ * initialized, because we cannot enable it properly with the
+ * reset asserted. Exit without warning because that behavior is
+ * expected.
+ */
+ if ((oh->flags & HWMOD_INIT_NO_RESET) && oh->rst_lines_cnt == 1)
+ return 0;
+
+ r = _omap_hwmod_enable(oh);
if (r) {
pr_warning("omap_hwmod: %s: cannot be enabled (%d)\n",
oh->name, oh->_state);
}
if (!(oh->flags & HWMOD_INIT_NO_RESET)) {
+ _reset(oh);
+
/*
- * XXX Do the OCP_SYSCONFIG bits need to be
- * reprogrammed after a reset? If not, then this can
- * be removed. If they do, then probably the
- * _enable() function should be split to avoid the
- * rewrite of the OCP_SYSCONFIG register.
+ * OCP_SYSCONFIG bits need to be reprogrammed after a softreset.
+ * The _omap_hwmod_enable() function should be split to
+ * avoid the rewrite of the OCP_SYSCONFIG register.
*/
if (oh->class->sysc) {
_update_sysc_cache(oh);
- _sysc_enable(oh);
+ _enable_sysc(oh);
}
}
- if (!(oh->flags & HWMOD_INIT_NO_IDLE))
- _idle(oh);
+ if (!(oh->flags & HWMOD_INIT_NO_IDLE) && !skip_setup_idle)
+ _omap_hwmod_idle(oh);
return 0;
}
/* Public functions */
-u32 omap_hwmod_readl(struct omap_hwmod *oh, u16 reg_offs)
+u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
{
- return __raw_readl(oh->_rt_va + reg_offs);
+ if (oh->flags & HWMOD_16BIT_REG)
+ return __raw_readw(oh->_mpu_rt_va + reg_offs);
+ else
+ return __raw_readl(oh->_mpu_rt_va + reg_offs);
}
-void omap_hwmod_writel(u32 v, struct omap_hwmod *oh, u16 reg_offs)
+void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
{
- __raw_writel(v, oh->_rt_va + reg_offs);
+ if (oh->flags & HWMOD_16BIT_REG)
+ __raw_writew(v, oh->_mpu_rt_va + reg_offs);
+ else
+ __raw_writel(v, oh->_mpu_rt_va + reg_offs);
}
+/**
+ * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
+ * @oh: struct omap_hwmod *
+ * @idlemode: SIDLEMODE field bits (shifted to bit 0)
+ *
+ * Sets the IP block's OCP slave idlemode in hardware, and updates our
+ * local copy. Intended to be used by drivers that have some erratum
+ * that requires direct manipulation of the SIDLEMODE bits. Returns
+ * -EINVAL if @oh is null, or passes along the return value from
+ * _set_slave_idlemode().
+ *
+ * XXX Does this function have any current users? If not, we should
+ * remove it; it is better to let the rest of the hwmod code handle this.
+ * Any users of this function should be scrutinized carefully.
+ */
int omap_hwmod_set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode)
{
u32 v;
ms_id = _find_mpu_port_index(oh);
if (!IS_ERR_VALUE(ms_id)) {
oh->_mpu_port_index = ms_id;
- oh->_rt_va = _find_mpu_rt_base(oh, oh->_mpu_port_index);
+ oh->_mpu_rt_va = _find_mpu_rt_base(oh, oh->_mpu_port_index);
} else {
oh->_int_flags |= _HWMOD_NO_MPU_PORT;
}
/**
* omap_hwmod_for_each - call function for each registered omap_hwmod
* @fn: pointer to a callback function
+ * @data: void * data to pass to callback function
*
* Call @fn for each registered omap_hwmod, passing @data to each
* function. @fn must return 0 for success or any other value for
* caller of omap_hwmod_for_each(). @fn is called with
* omap_hwmod_for_each() held.
*/
-int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh))
+int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
+ void *data)
{
struct omap_hwmod *temp_oh;
int ret;
mutex_lock(&omap_hwmod_mutex);
list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
- ret = (*fn)(temp_oh);
+ ret = (*fn)(temp_oh, data);
if (ret)
break;
}
/**
* omap_hwmod_late_init - do some post-clock framework initialization
+ * @skip_setup_idle: if 1, do not idle hwmods in _setup()
*
* Must be called after omap2_clk_init(). Resolves the struct clk names
* to struct clk pointers for each registered omap_hwmod. Also calls
* _setup() on each hwmod. Returns 0.
*/
-int omap_hwmod_late_init(void)
+int omap_hwmod_late_init(u8 skip_setup_idle)
{
int r;
/* XXX check return value */
- r = omap_hwmod_for_each(_init_clocks);
+ r = omap_hwmod_for_each(_init_clocks, NULL);
WARN(r, "omap_hwmod: omap_hwmod_late_init(): _init_clocks failed\n");
mpu_oh = omap_hwmod_lookup(MPU_INITIATOR_NAME);
WARN(!mpu_oh, "omap_hwmod: could not find MPU initiator hwmod %s\n",
MPU_INITIATOR_NAME);
- omap_hwmod_for_each(_setup);
+ if (skip_setup_idle)
+ pr_debug("omap_hwmod: will leave hwmods enabled during setup\n");
+
+ omap_hwmod_for_each(_setup, &skip_setup_idle);
return 0;
}
pr_debug("omap_hwmod: %s: unregistering\n", oh->name);
mutex_lock(&omap_hwmod_mutex);
- iounmap(oh->_rt_va);
+ iounmap(oh->_mpu_rt_va);
list_del(&oh->node);
mutex_unlock(&omap_hwmod_mutex);
* omap_hwmod_enable - enable an omap_hwmod
* @oh: struct omap_hwmod *
*
- * Enable an omap_hwomd @oh. Intended to be called by omap_device_enable().
+ * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
* Returns -EINVAL on error or passes along the return value from _enable().
*/
int omap_hwmod_enable(struct omap_hwmod *oh)
if (!oh)
return -EINVAL;
- mutex_lock(&omap_hwmod_mutex);
- r = _enable(oh);
- mutex_unlock(&omap_hwmod_mutex);
+ mutex_lock(&oh->_mutex);
+ r = _omap_hwmod_enable(oh);
+ mutex_unlock(&oh->_mutex);
return r;
}
+
/**
* omap_hwmod_idle - idle an omap_hwmod
* @oh: struct omap_hwmod *
*
- * Idle an omap_hwomd @oh. Intended to be called by omap_device_idle().
+ * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
* Returns -EINVAL on error or passes along the return value from _idle().
*/
int omap_hwmod_idle(struct omap_hwmod *oh)
if (!oh)
return -EINVAL;
- mutex_lock(&omap_hwmod_mutex);
- _idle(oh);
- mutex_unlock(&omap_hwmod_mutex);
+ mutex_lock(&oh->_mutex);
+ _omap_hwmod_idle(oh);
+ mutex_unlock(&oh->_mutex);
return 0;
}
* omap_hwmod_shutdown - shutdown an omap_hwmod
* @oh: struct omap_hwmod *
*
- * Shutdown an omap_hwomd @oh. Intended to be called by
+ * Shutdown an omap_hwmod @oh. Intended to be called by
* omap_device_shutdown(). Returns -EINVAL on error or passes along
* the return value from _shutdown().
*/
if (!oh)
return -EINVAL;
- mutex_lock(&omap_hwmod_mutex);
+ mutex_lock(&oh->_mutex);
_shutdown(oh);
- mutex_unlock(&omap_hwmod_mutex);
+ mutex_unlock(&oh->_mutex);
return 0;
}
*/
int omap_hwmod_enable_clocks(struct omap_hwmod *oh)
{
- mutex_lock(&omap_hwmod_mutex);
+ mutex_lock(&oh->_mutex);
_enable_clocks(oh);
- mutex_unlock(&omap_hwmod_mutex);
+ mutex_unlock(&oh->_mutex);
return 0;
}
*/
int omap_hwmod_disable_clocks(struct omap_hwmod *oh)
{
- mutex_lock(&omap_hwmod_mutex);
+ mutex_lock(&oh->_mutex);
_disable_clocks(oh);
- mutex_unlock(&omap_hwmod_mutex);
+ mutex_unlock(&oh->_mutex);
return 0;
}
* Forces posted writes to complete on the OCP thread handling
* register writes
*/
- omap_hwmod_readl(oh, oh->class->sysc->sysc_offs);
+ omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
}
/**
*
* Under some conditions, a driver may wish to reset the entire device.
* Called from omap_device code. Returns -EINVAL on error or passes along
- * the return value from _reset()/_enable().
+ * the return value from _reset().
*/
int omap_hwmod_reset(struct omap_hwmod *oh)
{
int r;
- if (!oh || !(oh->_state & _HWMOD_STATE_ENABLED))
+ if (!oh)
return -EINVAL;
- mutex_lock(&omap_hwmod_mutex);
+ mutex_lock(&oh->_mutex);
r = _reset(oh);
- if (!r)
- r = _enable(oh);
- mutex_unlock(&omap_hwmod_mutex);
+ mutex_unlock(&oh->_mutex);
return r;
}
{
int ret, i;
- ret = oh->mpu_irqs_cnt + oh->sdma_chs_cnt;
+ ret = oh->mpu_irqs_cnt + oh->sdma_reqs_cnt;
for (i = 0; i < oh->slaves_cnt; i++)
ret += oh->slaves[i]->addr_cnt;
r++;
}
- for (i = 0; i < oh->sdma_chs_cnt; i++) {
- (res + r)->name = (oh->sdma_chs + i)->name;
- (res + r)->start = (oh->sdma_chs + i)->dma_ch;
- (res + r)->end = (oh->sdma_chs + i)->dma_ch;
+ for (i = 0; i < oh->sdma_reqs_cnt; i++) {
+ (res + r)->name = (oh->sdma_reqs + i)->name;
+ (res + r)->start = (oh->sdma_reqs + i)->dma_req;
+ (res + r)->end = (oh->sdma_reqs + i)->dma_req;
(res + r)->flags = IORESOURCE_DMA;
r++;
}
}
+/**
+ * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
+ * @oh: struct omap_hwmod *
+ *
+ * Returns the virtual address corresponding to the beginning of the
+ * module's register target, in the address range that is intended to
+ * be used by the MPU. Returns the virtual address upon success or NULL
+ * upon error.
+ */
+void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
+{
+ if (!oh)
+ return NULL;
+
+ if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
+ return NULL;
+
+ if (oh->_state == _HWMOD_STATE_UNKNOWN)
+ return NULL;
+
+ return oh->_mpu_rt_va;
+}
+
/**
* omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
* @oh: struct omap_hwmod *
!(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
return -EINVAL;
- mutex_lock(&omap_hwmod_mutex);
+ mutex_lock(&oh->_mutex);
_enable_wakeup(oh);
- mutex_unlock(&omap_hwmod_mutex);
+ mutex_unlock(&oh->_mutex);
return 0;
}
!(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
return -EINVAL;
- mutex_lock(&omap_hwmod_mutex);
+ mutex_lock(&oh->_mutex);
_disable_wakeup(oh);
- mutex_unlock(&omap_hwmod_mutex);
+ mutex_unlock(&oh->_mutex);
return 0;
}
+/**
+ * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
+ * contained in the hwmod module.
+ * @oh: struct omap_hwmod *
+ * @name: name of the reset line to lookup and assert
+ *
+ * Some IP like dsp, ipu or iva contain processor that require
+ * an HW reset line to be assert / deassert in order to enable fully
+ * the IP. Returns -EINVAL if @oh is null or if the operation is not
+ * yet supported on this OMAP; otherwise, passes along the return value
+ * from _assert_hardreset().
+ */
+int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
+{
+ int ret;
+
+ if (!oh)
+ return -EINVAL;
+
+ mutex_lock(&oh->_mutex);
+ ret = _assert_hardreset(oh, name);
+ mutex_unlock(&oh->_mutex);
+
+ return ret;
+}
+
+/**
+ * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
+ * contained in the hwmod module.
+ * @oh: struct omap_hwmod *
+ * @name: name of the reset line to look up and deassert
+ *
+ * Some IP like dsp, ipu or iva contain processor that require
+ * an HW reset line to be assert / deassert in order to enable fully
+ * the IP. Returns -EINVAL if @oh is null or if the operation is not
+ * yet supported on this OMAP; otherwise, passes along the return value
+ * from _deassert_hardreset().
+ */
+int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
+{
+ int ret;
+
+ if (!oh)
+ return -EINVAL;
+
+ mutex_lock(&oh->_mutex);
+ ret = _deassert_hardreset(oh, name);
+ mutex_unlock(&oh->_mutex);
+
+ return ret;
+}
+
+/**
+ * omap_hwmod_read_hardreset - read the HW reset line state of submodules
+ * contained in the hwmod module
+ * @oh: struct omap_hwmod *
+ * @name: name of the reset line to look up and read
+ *
+ * Return the current state of the hwmod @oh's reset line named @name:
+ * returns -EINVAL upon parameter error or if this operation
+ * is unsupported on the current OMAP; otherwise, passes along the return
+ * value from _read_hardreset().
+ */
+int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name)
+{
+ int ret;
+
+ if (!oh)
+ return -EINVAL;
+
+ mutex_lock(&oh->_mutex);
+ ret = _read_hardreset(oh, name);
+ mutex_unlock(&oh->_mutex);
+
+ return ret;
+}
+
+
/**
* omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
* @classname: struct omap_hwmod_class name to search for
git.openpandora.org / pandora-kernel.git / blobdiff