* omap_hwmod implementation for OMAP2/3/4
*
* Copyright (C) 2009-2011 Nokia Corporation
- * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011-2012 Texas Instruments, Inc.
*
* Paul Walmsley, Benoît Cousson, Kevin Hilman
*
oh->prcm.omap4.clkctrl_offs);
}
-/**
- * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
- * @oh: struct omap_hwmod *
- *
- * Disable the PRCM module mode related to the hwmod @oh.
- * Return EINVAL if the modulemode is not supported and 0 in case of success.
- */
-static int _omap4_disable_module(struct omap_hwmod *oh)
-{
- int v;
-
- /* The module mode does not exist prior OMAP4 */
- if (!cpu_is_omap44xx())
- return -EINVAL;
-
- if (!oh->clkdm || !oh->prcm.omap4.modulemode)
- return -EINVAL;
-
- pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
-
- omap4_cminst_module_disable(oh->clkdm->prcm_partition,
- oh->clkdm->cm_inst,
- oh->clkdm->clkdm_offs,
- oh->prcm.omap4.clkctrl_offs);
-
- v = _omap4_wait_target_disable(oh);
- if (v)
- pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
- oh->name);
-
- return 0;
-}
-
/**
* _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
* @oh: struct omap_hwmod *oh
return i-1;
}
+/**
+ * _get_mpu_irq_by_name - fetch MPU interrupt line number by name
+ * @oh: struct omap_hwmod * to operate on
+ * @name: pointer to the name of the MPU interrupt number to fetch (optional)
+ * @irq: pointer to an unsigned int to store the MPU IRQ number to
+ *
+ * Retrieve a MPU hardware IRQ line number named by @name associated
+ * with the IP block pointed to by @oh. The IRQ number will be filled
+ * into the address pointed to by @dma. When @name is non-null, the
+ * IRQ line number associated with the named entry will be returned.
+ * If @name is null, the first matching entry will be returned. Data
+ * order is not meaningful in hwmod data, so callers are strongly
+ * encouraged to use a non-null @name whenever possible to avoid
+ * unpredictable effects if hwmod data is later added that causes data
+ * ordering to change. Returns 0 upon success or a negative error
+ * code upon error.
+ */
+static int _get_mpu_irq_by_name(struct omap_hwmod *oh, const char *name,
+ unsigned int *irq)
+{
+ int i;
+ bool found = false;
+
+ if (!oh->mpu_irqs)
+ return -ENOENT;
+
+ i = 0;
+ while (oh->mpu_irqs[i].irq != -1) {
+ if (name == oh->mpu_irqs[i].name ||
+ !strcmp(name, oh->mpu_irqs[i].name)) {
+ found = true;
+ break;
+ }
+ i++;
+ }
+
+ if (!found)
+ return -ENOENT;
+
+ *irq = oh->mpu_irqs[i].irq;
+
+ return 0;
+}
+
+/**
+ * _get_sdma_req_by_name - fetch SDMA request line ID by name
+ * @oh: struct omap_hwmod * to operate on
+ * @name: pointer to the name of the SDMA request line to fetch (optional)
+ * @dma: pointer to an unsigned int to store the request line ID to
+ *
+ * Retrieve an SDMA request line ID named by @name on the IP block
+ * pointed to by @oh. The ID will be filled into the address pointed
+ * to by @dma. When @name is non-null, the request line ID associated
+ * with the named entry will be returned. If @name is null, the first
+ * matching entry will be returned. Data order is not meaningful in
+ * hwmod data, so callers are strongly encouraged to use a non-null
+ * @name whenever possible to avoid unpredictable effects if hwmod
+ * data is later added that causes data ordering to change. Returns 0
+ * upon success or a negative error code upon error.
+ */
+static int _get_sdma_req_by_name(struct omap_hwmod *oh, const char *name,
+ unsigned int *dma)
+{
+ int i;
+ bool found = false;
+
+ if (!oh->sdma_reqs)
+ return -ENOENT;
+
+ i = 0;
+ while (oh->sdma_reqs[i].dma_req != -1) {
+ if (name == oh->sdma_reqs[i].name ||
+ !strcmp(name, oh->sdma_reqs[i].name)) {
+ found = true;
+ break;
+ }
+ i++;
+ }
+
+ if (!found)
+ return -ENOENT;
+
+ *dma = oh->sdma_reqs[i].dma_req;
+
+ return 0;
+}
+
+/**
+ * _get_addr_space_by_name - fetch address space start & end by name
+ * @oh: struct omap_hwmod * to operate on
+ * @name: pointer to the name of the address space to fetch (optional)
+ * @pa_start: pointer to a u32 to store the starting address to
+ * @pa_end: pointer to a u32 to store the ending address to
+ *
+ * Retrieve address space start and end addresses for the IP block
+ * pointed to by @oh. The data will be filled into the addresses
+ * pointed to by @pa_start and @pa_end. When @name is non-null, the
+ * address space data associated with the named entry will be
+ * returned. If @name is null, the first matching entry will be
+ * returned. Data order is not meaningful in hwmod data, so callers
+ * are strongly encouraged to use a non-null @name whenever possible
+ * to avoid unpredictable effects if hwmod data is later added that
+ * causes data ordering to change. Returns 0 upon success or a
+ * negative error code upon error.
+ */
+static int _get_addr_space_by_name(struct omap_hwmod *oh, const char *name,
+ u32 *pa_start, u32 *pa_end)
+{
+ int i, j;
+ struct omap_hwmod_ocp_if *os;
+ bool found = false;
+
+ for (i = 0; i < oh->slaves_cnt; i++) {
+ os = oh->slaves[i];
+
+ if (!os->addr)
+ return -ENOENT;
+
+ j = 0;
+ while (os->addr[j].pa_start != os->addr[j].pa_end) {
+ if (name == os->addr[j].name ||
+ !strcmp(name, os->addr[j].name)) {
+ found = true;
+ break;
+ }
+ j++;
+ }
+
+ if (found)
+ break;
+ }
+
+ if (!found)
+ return -ENOENT;
+
+ *pa_start = os->addr[j].pa_start;
+ *pa_end = os->addr[j].pa_end;
+
+ return 0;
+}
+
/**
* _find_mpu_port_index - find hwmod OCP slave port ID intended for MPU use
* @oh: struct omap_hwmod *
}
/**
- * _find_mpu_rt_base - find hwmod register target base addr accessible by MPU
+ * _find_mpu_rt_addr_space - return MPU register target address space for @oh
* @oh: struct omap_hwmod *
*
- * Return the virtual address of the base of the register target of
- * device @oh, or NULL on error.
+ * Returns a pointer to the struct omap_hwmod_addr_space record representing
+ * the register target MPU address space; or returns NULL upon error.
*/
-static void __iomem * __init _find_mpu_rt_base(struct omap_hwmod *oh, u8 index)
+static struct omap_hwmod_addr_space * __init _find_mpu_rt_addr_space(struct omap_hwmod *oh)
{
struct omap_hwmod_ocp_if *os;
struct omap_hwmod_addr_space *mem;
- int i = 0, found = 0;
- void __iomem *va_start;
+ int found = 0, i = 0;
- if (!oh || oh->slaves_cnt == 0)
+ if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0)
return NULL;
- os = oh->slaves[index];
-
+ os = oh->slaves[oh->_mpu_port_index];
if (!os->addr)
return NULL;
found = 1;
} while (!found && mem->pa_start != mem->pa_end);
- if (found) {
- va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
- if (!va_start) {
- pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
- return NULL;
- }
- pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
- oh->name, va_start);
- } else {
- pr_debug("omap_hwmod: %s: no MPU register target found\n",
- oh->name);
- }
-
- return (found) ? va_start : NULL;
+ return (found) ? mem : NULL;
}
/**
}
}
+/**
+ * _are_any_hardreset_lines_asserted - return true if part of @oh is hard-reset
+ * @oh: struct omap_hwmod *
+ *
+ * If any hardreset line associated with @oh is asserted, then return true.
+ * Otherwise, if @oh has no hardreset lines associated with it, or if
+ * no hardreset lines associated with @oh are asserted, then return false.
+ * This function is used to avoid executing some parts of the IP block
+ * enable/disable sequence if a hardreset line is set.
+ */
+static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh)
+{
+ int i;
+
+ if (oh->rst_lines_cnt == 0)
+ return false;
+
+ for (i = 0; i < oh->rst_lines_cnt; i++)
+ if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
+ return true;
+
+ return false;
+}
+
+/**
+ * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
+ * @oh: struct omap_hwmod *
+ *
+ * Disable the PRCM module mode related to the hwmod @oh.
+ * Return EINVAL if the modulemode is not supported and 0 in case of success.
+ */
+static int _omap4_disable_module(struct omap_hwmod *oh)
+{
+ int v;
+
+ /* The module mode does not exist prior OMAP4 */
+ if (!cpu_is_omap44xx())
+ return -EINVAL;
+
+ if (!oh->clkdm || !oh->prcm.omap4.modulemode)
+ return -EINVAL;
+
+ pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
+
+ omap4_cminst_module_disable(oh->clkdm->prcm_partition,
+ oh->clkdm->cm_inst,
+ oh->clkdm->clkdm_offs,
+ oh->prcm.omap4.clkctrl_offs);
+
+ if (_are_any_hardreset_lines_asserted(oh))
+ return 0;
+
+ v = _omap4_wait_target_disable(oh);
+ if (v)
+ pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
+ oh->name);
+
+ return 0;
+}
+
/**
* _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
* @oh: struct omap_hwmod *
*
* Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
- * 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.
+ * enabled for this to work. Returns -ENOENT if the hwmod cannot be
+ * reset this way, -EINVAL 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 do not have SYSSTATUS registers and instead
*/
static int _ocp_softreset(struct omap_hwmod *oh)
{
- u32 v;
+ u32 v, softrst_mask;
int c = 0;
int ret = 0;
if (!oh->class->sysc ||
!(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
- return -EINVAL;
+ return -ENOENT;
/* clocks must be on for this operation */
if (oh->_state != _HWMOD_STATE_ENABLED) {
goto dis_opt_clks;
_write_sysconfig(v, oh);
+ if (oh->class->sysc->srst_udelay)
+ udelay(oh->class->sysc->srst_udelay);
+
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)
+ else if (oh->class->sysc->sysc_flags & SYSC_HAS_RESET_STATUS) {
+ softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
omap_test_timeout(!(omap_hwmod_read(oh,
oh->class->sysc->sysc_offs)
- & SYSC_TYPE2_SOFTRESET_MASK),
+ & softrst_mask),
MAX_MODULE_SOFTRESET_WAIT, c);
+ }
if (c == MAX_MODULE_SOFTRESET_WAIT)
pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
* _reset - reset an omap_hwmod
* @oh: struct omap_hwmod *
*
- * Resets an omap_hwmod @oh. The default software reset mechanism for
- * most OMAP IP blocks is triggered via the OCP_SYSCONFIG.SOFTRESET
- * bit. However, some hwmods cannot be reset via this method: some
- * are not targets and therefore have no OCP header registers to
- * access; others (like the IVA) have idiosyncratic reset sequences.
- * So for these relatively rare cases, custom reset code can be
- * supplied in the struct omap_hwmod_class .reset function pointer.
- * Passes along the return value from either _reset() or the custom
- * reset function - these must return -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.
+ * Resets an omap_hwmod @oh. If the module has a custom reset
+ * function pointer defined, then call it to reset the IP block, and
+ * pass along its return value to the caller. Otherwise, if the IP
+ * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
+ * associated with it, call a function to reset the IP block via that
+ * method, and pass along the return value to the caller. Finally, if
+ * the IP block has some hardreset lines associated with it, assert
+ * all of those, but do _not_ deassert them. (This is because driver
+ * authors have expressed an apparent requirement to control the
+ * deassertion of the hardreset lines themselves.)
+ *
+ * The default software reset mechanism for most OMAP IP blocks is
+ * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
+ * hwmods cannot be reset via this method. Some are not targets and
+ * therefore have no OCP header registers to access. Others (like the
+ * IVA) have idiosyncratic reset sequences. So for these relatively
+ * rare cases, custom reset code can be supplied in the struct
+ * omap_hwmod_class .reset function pointer. Passes along the return
+ * value from either _ocp_softreset() or the custom reset function -
+ * these must return -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.
*/
static int _reset(struct omap_hwmod *oh)
{
- int ret;
+ int i, r;
pr_debug("omap_hwmod: %s: resetting\n", oh->name);
- ret = (oh->class->reset) ? oh->class->reset(oh) : _ocp_softreset(oh);
+ if (oh->class->reset) {
+ r = oh->class->reset(oh);
+ } else {
+ if (oh->rst_lines_cnt > 0) {
+ for (i = 0; i < oh->rst_lines_cnt; i++)
+ _assert_hardreset(oh, oh->rst_lines[i].name);
+ return 0;
+ } else {
+ r = _ocp_softreset(oh);
+ if (r == -ENOENT)
+ r = 0;
+ }
+ }
- return ret;
+ /*
+ * OCP_SYSCONFIG bits need to be reprogrammed after a
+ * softreset. The _enable() function should be split to avoid
+ * the rewrite of the OCP_SYSCONFIG register.
+ */
+ if (oh->class->sysc) {
+ _update_sysc_cache(oh);
+ _enable_sysc(oh);
+ }
+
+ return r;
}
/**
pr_debug("omap_hwmod: %s: enabling\n", oh->name);
/*
- * hwmods with HWMOD_INIT_NO_IDLE flag set are left
- * in enabled state at init.
- * Now that someone is really trying to enable them,
- * just ensure that the hwmod mux is set.
+ * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
+ * state at init. Now that someone is really trying to enable
+ * them, just ensure that the hwmod mux is set.
*/
if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
/*
return -EINVAL;
}
-
/*
- * If an IP contains only one HW reset line, then de-assert it in order
- * to allow the module state transition. Otherwise the PRCM will return
- * Intransition status, and the init will failed.
+ * If an IP block contains HW reset lines and any of them are
+ * asserted, we let integration code associated with that
+ * block handle the enable. We've received very little
+ * information on what those driver authors need, and until
+ * detailed information is provided and the driver code is
+ * posted to the public lists, this is probably the best we
+ * can do.
*/
- if ((oh->_state == _HWMOD_STATE_INITIALIZED ||
- oh->_state == _HWMOD_STATE_DISABLED) && oh->rst_lines_cnt == 1)
- _deassert_hardreset(oh, oh->rst_lines[0].name);
+ if (_are_any_hardreset_lines_asserted(oh))
+ return 0;
/* Mux pins for device runtime if populated */
if (oh->mux && (!oh->mux->enabled ||
return -EINVAL;
}
+ if (_are_any_hardreset_lines_asserted(oh))
+ return 0;
+
if (oh->class->sysc)
_idle_sysc(oh);
_del_initiator_dep(oh, mpu_oh);
*/
static int _shutdown(struct omap_hwmod *oh)
{
- int ret;
+ int ret, i;
u8 prev_state;
if (oh->_state != _HWMOD_STATE_IDLE &&
return -EINVAL;
}
+ if (_are_any_hardreset_lines_asserted(oh))
+ return 0;
+
pr_debug("omap_hwmod: %s: disabling\n", oh->name);
if (oh->class->pre_shutdown) {
}
/* XXX Should this code also force-disable the optional clocks? */
- /*
- * If an IP contains only one HW reset line, then assert it
- * after disabling the clocks and before shutting down the IP.
- */
- if (oh->rst_lines_cnt == 1)
- _assert_hardreset(oh, oh->rst_lines[0].name);
+ for (i = 0; i < oh->rst_lines_cnt; i++)
+ _assert_hardreset(oh, oh->rst_lines[i].name);
/* Mux pins to safe mode or use populated off mode values */
if (oh->mux)
}
/**
- * _setup - do initial configuration of omap_hwmod
- * @oh: struct omap_hwmod *
+ * _init_mpu_rt_base - populate the virtual address for a hwmod
+ * @oh: struct omap_hwmod * to locate the virtual address
*
- * Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh
- * OCP_SYSCONFIG register. Returns 0.
+ * Cache the virtual address used by the MPU to access this IP block's
+ * registers. This address is needed early so the OCP registers that
+ * are part of the device's address space can be ioremapped properly.
+ * No return value.
*/
-static int _setup(struct omap_hwmod *oh, void *data)
+static void __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data)
{
- int i, r;
- u8 postsetup_state;
+ struct omap_hwmod_addr_space *mem;
+ void __iomem *va_start;
- if (oh->_state != _HWMOD_STATE_CLKS_INITED)
- return 0;
+ if (!oh)
+ return;
- /* Set iclk autoidle mode */
- if (oh->slaves_cnt > 0) {
- for (i = 0; i < oh->slaves_cnt; i++) {
- struct omap_hwmod_ocp_if *os = oh->slaves[i];
- struct clk *c = os->_clk;
+ if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
+ return;
- if (!c)
- continue;
+ mem = _find_mpu_rt_addr_space(oh);
+ if (!mem) {
+ pr_debug("omap_hwmod: %s: no MPU register target found\n",
+ oh->name);
+ return;
+ }
- if (os->flags & OCPIF_SWSUP_IDLE) {
- /* XXX omap_iclk_deny_idle(c); */
- } else {
- /* XXX omap_iclk_allow_idle(c); */
- clk_enable(c);
- }
- }
+ va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
+ if (!va_start) {
+ pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
+ return;
}
- oh->_state = _HWMOD_STATE_INITIALIZED;
+ pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
+ oh->name, va_start);
- /*
- * 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;
+ oh->_mpu_rt_va = va_start;
+}
- r = _enable(oh);
- if (r) {
- pr_warning("omap_hwmod: %s: cannot be enabled (%d)\n",
- oh->name, oh->_state);
+/**
+ * _init - initialize internal data for the hwmod @oh
+ * @oh: struct omap_hwmod *
+ * @n: (unused)
+ *
+ * Look up the clocks and the address space used by the MPU to access
+ * registers belonging to the hwmod @oh. @oh must already be
+ * registered at this point. This is the first of two phases for
+ * hwmod initialization. Code called here does not touch any hardware
+ * registers, it simply prepares internal data structures. Returns 0
+ * upon success or if the hwmod isn't registered, or -EINVAL upon
+ * failure.
+ */
+static int __init _init(struct omap_hwmod *oh, void *data)
+{
+ int r;
+
+ if (oh->_state != _HWMOD_STATE_REGISTERED)
return 0;
+
+ _init_mpu_rt_base(oh, NULL);
+
+ r = _init_clocks(oh, NULL);
+ if (IS_ERR_VALUE(r)) {
+ WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name);
+ return -EINVAL;
}
- if (!(oh->flags & HWMOD_INIT_NO_RESET)) {
- _reset(oh);
+ oh->_state = _HWMOD_STATE_INITIALIZED;
- /*
- * OCP_SYSCONFIG bits need to be reprogrammed after a softreset.
- * The _enable() function should be split to
- * avoid the rewrite of the OCP_SYSCONFIG register.
- */
- if (oh->class->sysc) {
- _update_sysc_cache(oh);
- _enable_sysc(oh);
+ return 0;
+}
+
+/**
+ * _setup_iclk_autoidle - configure an IP block's interface clocks
+ * @oh: struct omap_hwmod *
+ *
+ * Set up the module's interface clocks. XXX This function is still mostly
+ * a stub; implementing this properly requires iclk autoidle usecounting in
+ * the clock code. No return value.
+ */
+static void __init _setup_iclk_autoidle(struct omap_hwmod *oh)
+{
+ int i;
+
+ if (oh->_state != _HWMOD_STATE_INITIALIZED)
+ return;
+
+ for (i = 0; i < oh->slaves_cnt; i++) {
+ struct omap_hwmod_ocp_if *os = oh->slaves[i];
+ struct clk *c = os->_clk;
+
+ if (!c)
+ continue;
+
+ if (os->flags & OCPIF_SWSUP_IDLE) {
+ /* XXX omap_iclk_deny_idle(c); */
+ } else {
+ /* XXX omap_iclk_allow_idle(c); */
+ clk_enable(c);
}
}
+ return;
+}
+
+/**
+ * _setup_reset - reset an IP block during the setup process
+ * @oh: struct omap_hwmod *
+ *
+ * Reset the IP block corresponding to the hwmod @oh during the setup
+ * process. The IP block is first enabled so it can be successfully
+ * reset. Returns 0 upon success or a negative error code upon
+ * failure.
+ */
+static int __init _setup_reset(struct omap_hwmod *oh)
+{
+ int r;
+
+ if (oh->_state != _HWMOD_STATE_INITIALIZED)
+ return -EINVAL;
+
+ if (oh->rst_lines_cnt == 0) {
+ r = _enable(oh);
+ if (r) {
+ pr_warning("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
+ oh->name, oh->_state);
+ return -EINVAL;
+ }
+ }
+
+ if (!(oh->flags & HWMOD_INIT_NO_RESET))
+ r = _reset(oh);
+
+ return r;
+}
+
+/**
+ * _setup_postsetup - transition to the appropriate state after _setup
+ * @oh: struct omap_hwmod *
+ *
+ * Place an IP block represented by @oh into a "post-setup" state --
+ * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
+ * this function is called at the end of _setup().) The postsetup
+ * state for an IP block can be changed by calling
+ * omap_hwmod_enter_postsetup_state() early in the boot process,
+ * before one of the omap_hwmod_setup*() functions are called for the
+ * IP block.
+ *
+ * The IP block stays in this state until a PM runtime-based driver is
+ * loaded for that IP block. A post-setup state of IDLE is
+ * appropriate for almost all IP blocks with runtime PM-enabled
+ * drivers, since those drivers are able to enable the IP block. A
+ * post-setup state of ENABLED is appropriate for kernels with PM
+ * runtime disabled. The DISABLED state is appropriate for unusual IP
+ * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
+ * included, since the WDTIMER starts running on reset and will reset
+ * the MPU if left active.
+ *
+ * This post-setup mechanism is deprecated. Once all of the OMAP
+ * drivers have been converted to use PM runtime, and all of the IP
+ * block data and interconnect data is available to the hwmod code, it
+ * should be possible to replace this mechanism with a "lazy reset"
+ * arrangement. In a "lazy reset" setup, each IP block is enabled
+ * when the driver first probes, then all remaining IP blocks without
+ * drivers are either shut down or enabled after the drivers have
+ * loaded. However, this cannot take place until the above
+ * preconditions have been met, since otherwise the late reset code
+ * has no way of knowing which IP blocks are in use by drivers, and
+ * which ones are unused.
+ *
+ * No return value.
+ */
+static void __init _setup_postsetup(struct omap_hwmod *oh)
+{
+ u8 postsetup_state;
+
+ if (oh->rst_lines_cnt > 0)
+ return;
+
postsetup_state = oh->_postsetup_state;
if (postsetup_state == _HWMOD_STATE_UNKNOWN)
postsetup_state = _HWMOD_STATE_ENABLED;
WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
oh->name, postsetup_state);
+ return;
+}
+
+/**
+ * _setup - prepare IP block hardware for use
+ * @oh: struct omap_hwmod *
+ * @n: (unused, pass NULL)
+ *
+ * Configure the IP block represented by @oh. This may include
+ * enabling the IP block, resetting it, and placing it into a
+ * post-setup state, depending on the type of IP block and applicable
+ * flags. IP blocks are reset to prevent any previous configuration
+ * by the bootloader or previous operating system from interfering
+ * with power management or other parts of the system. The reset can
+ * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
+ * two phases for hwmod initialization. Code called here generally
+ * affects the IP block hardware, or system integration hardware
+ * associated with the IP block. Returns 0.
+ */
+static int __init _setup(struct omap_hwmod *oh, void *data)
+{
+ if (oh->_state != _HWMOD_STATE_INITIALIZED)
+ return 0;
+
+ _setup_iclk_autoidle(oh);
+
+ if (!_setup_reset(oh))
+ _setup_postsetup(oh);
+
return 0;
}
return 0;
}
-/*
- * _populate_mpu_rt_base - populate the virtual address for a hwmod
+/**
+ * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
+ * @oh: pointer to the hwmod currently being set up (usually not the MPU)
*
- * Must be called only from omap_hwmod_setup_*() so ioremap works properly.
- * Assumes the caller takes care of locking if needed.
+ * If the hwmod data corresponding to the MPU subsystem IP block
+ * hasn't been initialized and set up yet, do so now. This must be
+ * done first since sleep dependencies may be added from other hwmods
+ * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
+ * return value.
*/
-static int __init _populate_mpu_rt_base(struct omap_hwmod *oh, void *data)
+static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh)
{
- if (oh->_state != _HWMOD_STATE_REGISTERED)
- return 0;
-
- if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
- return 0;
-
- oh->_mpu_rt_va = _find_mpu_rt_base(oh, oh->_mpu_port_index);
-
- return 0;
+ if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN)
+ pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
+ __func__, MPU_INITIATOR_NAME);
+ else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
+ omap_hwmod_setup_one(MPU_INITIATOR_NAME);
}
/**
* omap_hwmod_setup_one - set up a single hwmod
* @oh_name: const char * name of the already-registered hwmod to set up
*
- * 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 -EINVAL upon error or 0 upon
- * success.
+ * Initialize and set up a single hwmod. Intended to be used for a
+ * small number of early devices, such as the timer IP blocks used for
+ * the scheduler clock. 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
+ * -EINVAL upon error or 0 upon success.
*/
int __init omap_hwmod_setup_one(const char *oh_name)
{
struct omap_hwmod *oh;
- int r;
pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
- if (!mpu_oh) {
- pr_err("omap_hwmod: %s: cannot setup_one: MPU initiator hwmod %s not yet registered\n",
- oh_name, MPU_INITIATOR_NAME);
- return -EINVAL;
- }
-
oh = _lookup(oh_name);
if (!oh) {
WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
return -EINVAL;
}
- if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
- omap_hwmod_setup_one(MPU_INITIATOR_NAME);
-
- r = _populate_mpu_rt_base(oh, NULL);
- if (IS_ERR_VALUE(r)) {
- WARN(1, "omap_hwmod: %s: couldn't set mpu_rt_base\n", oh_name);
- return -EINVAL;
- }
-
- r = _init_clocks(oh, NULL);
- if (IS_ERR_VALUE(r)) {
- WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh_name);
- return -EINVAL;
- }
+ _ensure_mpu_hwmod_is_setup(oh);
+ _init(oh, NULL);
_setup(oh, NULL);
return 0;
}
/**
- * omap_hwmod_setup - do some post-clock framework initialization
+ * omap_hwmod_setup_all - set up all registered IP blocks
*
- * 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 upon success.
+ * Initialize and set up all IP blocks registered with the hwmod code.
+ * 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 upon success.
*/
static int __init omap_hwmod_setup_all(void)
{
- int r;
-
- if (!mpu_oh) {
- pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
- __func__, MPU_INITIATOR_NAME);
- return -EINVAL;
- }
-
- r = omap_hwmod_for_each(_populate_mpu_rt_base, NULL);
-
- r = omap_hwmod_for_each(_init_clocks, NULL);
- WARN(IS_ERR_VALUE(r),
- "omap_hwmod: %s: _init_clocks failed\n", __func__);
+ _ensure_mpu_hwmod_is_setup(NULL);
+ omap_hwmod_for_each(_init, NULL);
omap_hwmod_for_each(_setup, NULL);
return 0;
return r;
}
+/*
+ * IP block data retrieval functions
+ */
+
/**
* omap_hwmod_count_resources - count number of struct resources needed by hwmod
* @oh: struct omap_hwmod *
return r;
}
+/**
+ * omap_hwmod_get_resource_byname - fetch IP block integration data by name
+ * @oh: struct omap_hwmod * to operate on
+ * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
+ * @name: pointer to the name of the data to fetch (optional)
+ * @rsrc: pointer to a struct resource, allocated by the caller
+ *
+ * Retrieve MPU IRQ, SDMA request line, or address space start/end
+ * data for the IP block pointed to by @oh. The data will be filled
+ * into a struct resource record pointed to by @rsrc. The struct
+ * resource must be allocated by the caller. When @name is non-null,
+ * the data associated with the matching entry in the IRQ/SDMA/address
+ * space hwmod data arrays will be returned. If @name is null, the
+ * first array entry will be returned. Data order is not meaningful
+ * in hwmod data, so callers are strongly encouraged to use a non-null
+ * @name whenever possible to avoid unpredictable effects if hwmod
+ * data is later added that causes data ordering to change. This
+ * function is only intended for use by OMAP core code. Device
+ * drivers should not call this function - the appropriate bus-related
+ * data accessor functions should be used instead. Returns 0 upon
+ * success or a negative error code upon error.
+ */
+int omap_hwmod_get_resource_byname(struct omap_hwmod *oh, unsigned int type,
+ const char *name, struct resource *rsrc)
+{
+ int r;
+ unsigned int irq, dma;
+ u32 pa_start, pa_end;
+
+ if (!oh || !rsrc)
+ return -EINVAL;
+
+ if (type == IORESOURCE_IRQ) {
+ r = _get_mpu_irq_by_name(oh, name, &irq);
+ if (r)
+ return r;
+
+ rsrc->start = irq;
+ rsrc->end = irq;
+ } else if (type == IORESOURCE_DMA) {
+ r = _get_sdma_req_by_name(oh, name, &dma);
+ if (r)
+ return r;
+
+ rsrc->start = dma;
+ rsrc->end = dma;
+ } else if (type == IORESOURCE_MEM) {
+ r = _get_addr_space_by_name(oh, name, &pa_start, &pa_end);
+ if (r)
+ return r;
+
+ rsrc->start = pa_start;
+ rsrc->end = pa_end;
+ } else {
+ return -EINVAL;
+ }
+
+ rsrc->flags = type;
+ rsrc->name = name;
+
+ return 0;
+}
+
/**
* omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
* @oh: struct omap_hwmod *
* @oh: struct omap_hwmod *
*
* Sets the module OCP socket ENAWAKEUP bit to allow the module to
- * send wakeups to the PRCM. Eventually this should sets PRCM wakeup
- * registers to cause the PRCM to receive wakeup events from the
- * module. Does not set any wakeup routing registers beyond this
- * point - if the module is to wake up any other module or subsystem,
- * that must be set separately. Called by omap_device code. Returns
- * -EINVAL on error or 0 upon success.
+ * send wakeups to the PRCM, and enable I/O ring wakeup events for
+ * this IP block if it has dynamic mux entries. Eventually this
+ * should set PRCM wakeup registers to cause the PRCM to receive
+ * wakeup events from the module. Does not set any wakeup routing
+ * registers beyond this point - if the module is to wake up any other
+ * module or subsystem, that must be set separately. Called by
+ * omap_device code. Returns -EINVAL on error or 0 upon success.
*/
int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
{
unsigned long flags;
u32 v;
- if (!oh->class->sysc ||
- !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
- return -EINVAL;
-
spin_lock_irqsave(&oh->_lock, flags);
- v = oh->_sysc_cache;
- _enable_wakeup(oh, &v);
- _write_sysconfig(v, oh);
+
+ if (oh->class->sysc &&
+ (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
+ v = oh->_sysc_cache;
+ _enable_wakeup(oh, &v);
+ _write_sysconfig(v, oh);
+ }
+
_set_idle_ioring_wakeup(oh, true);
spin_unlock_irqrestore(&oh->_lock, flags);
* @oh: struct omap_hwmod *
*
* Clears the module OCP socket ENAWAKEUP bit to prevent the module
- * from sending wakeups to the PRCM. Eventually this should clear
- * PRCM wakeup registers to cause the PRCM to ignore wakeup events
- * from the module. Does not set any wakeup routing registers beyond
- * this point - if the module is to wake up any other module or
- * subsystem, that must be set separately. Called by omap_device
- * code. Returns -EINVAL on error or 0 upon success.
+ * from sending wakeups to the PRCM, and disable I/O ring wakeup
+ * events for this IP block if it has dynamic mux entries. Eventually
+ * this should clear PRCM wakeup registers to cause the PRCM to ignore
+ * wakeup events from the module. Does not set any wakeup routing
+ * registers beyond this point - if the module is to wake up any other
+ * module or subsystem, that must be set separately. Called by
+ * omap_device code. Returns -EINVAL on error or 0 upon success.
*/
int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
{
unsigned long flags;
u32 v;
- if (!oh->class->sysc ||
- !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
- return -EINVAL;
-
spin_lock_irqsave(&oh->_lock, flags);
- v = oh->_sysc_cache;
- _disable_wakeup(oh, &v);
- _write_sysconfig(v, oh);
+
+ if (oh->class->sysc &&
+ (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
+ v = oh->_sysc_cache;
+ _disable_wakeup(oh, &v);
+ _write_sysconfig(v, oh);
+ }
+
_set_idle_ioring_wakeup(oh, false);
spin_unlock_irqrestore(&oh->_lock, flags);
* @state: state that _setup() should leave the hwmod in
*
* Sets the hwmod state that @oh will enter at the end of _setup()
- * (called by omap_hwmod_setup_*()). Only valid to call between
- * calling omap_hwmod_register() and omap_hwmod_setup_*(). Returns
- * 0 upon success or -EINVAL if there is a problem with the arguments
- * or if the hwmod is in the wrong state.
+ * (called by omap_hwmod_setup_*()). See also the documentation
+ * for _setup_postsetup(), above. Returns 0 upon success or
+ * -EINVAL if there is a problem with the arguments or if the hwmod is
+ * in the wrong state.
*/
int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
{
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