// SPDX-License-Identifier: GPL-2.0-only /* * omap_hwmod implementation for OMAP2/3/4 * * Copyright (C) 2009-2011 Nokia Corporation * Copyright (C) 2011-2012 Texas Instruments, Inc. * * Paul Walmsley, Benoît Cousson, Kevin Hilman * * Created in collaboration with (alphabetical order): Thara Gopinath, * Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand * Sawant, Santosh Shilimkar, Richard Woodruff * * 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 | * | ({read,write}l_relaxed, 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) * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140) * - Open Core Protocol Specification 2.2 * * To do: * - handle IO mapping * - bus throughput & module latency measurement code * * XXX add tests at the beginning of each function to ensure the hwmod is * in the appropriate state * XXX error return values should be checked to ensure that they are * appropriate
*/ #undef DEBUG
/* Name of the OMAP hwmod for the MPU */ #define MPU_INITIATOR_NAME "mpu"
/* * Number of struct omap_hwmod_link records per struct * omap_hwmod_ocp_if record (master->slave and slave->master)
*/ #define LINKS_PER_OCP_IF 2
/* * Address offset (in bytes) between the reset control and the reset * status registers: 4 bytes on OMAP4
*/ #define OMAP4_RST_CTRL_ST_OFFSET 4
/* * Maximum length for module clock handle names
*/ #define MOD_CLK_MAX_NAME_LEN 32
/** * struct clkctrl_provider - clkctrl provider mapping data * @num_addrs: number of base address ranges for the provider * @addr: base address(es) for the provider * @size: size(s) of the provider address space(s) * @node: device node associated with the provider * @link: list link
*/ struct clkctrl_provider { int num_addrs;
u32 *addr;
u32 *size; struct device_node *node; struct list_head link;
};
static LIST_HEAD(clkctrl_providers);
/** * struct omap_hwmod_reset - IP specific reset functions * @match: string to match against the module name * @len: number of characters to match * @reset: IP specific reset function * * Used only in cases where struct omap_hwmod is dynamically allocated.
*/ struct omap_hwmod_reset { constchar *match; int len; int (*reset)(struct omap_hwmod *oh);
};
/** * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations * @enable_module: function to enable a module (via MODULEMODE) * @disable_module: function to disable a module (via MODULEMODE) * * XXX Eventually this functionality will be hidden inside the PRM/CM * device drivers. Until then, this should avoid huge blocks of cpu_is_*() * conditionals in this code.
*/ struct omap_hwmod_soc_ops { void (*enable_module)(struct omap_hwmod *oh); int (*disable_module)(struct omap_hwmod *oh); int (*wait_target_ready)(struct omap_hwmod *oh); int (*assert_hardreset)(struct omap_hwmod *oh, struct omap_hwmod_rst_info *ohri); int (*deassert_hardreset)(struct omap_hwmod *oh, struct omap_hwmod_rst_info *ohri); int (*is_hardreset_asserted)(struct omap_hwmod *oh, struct omap_hwmod_rst_info *ohri); int (*init_clkdm)(struct omap_hwmod *oh); void (*update_context_lost)(struct omap_hwmod *oh); int (*get_context_lost)(struct omap_hwmod *oh); int (*disable_direct_prcm)(struct omap_hwmod *oh);
u32 (*xlate_clkctrl)(struct omap_hwmod *oh);
};
/* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */ staticstruct omap_hwmod_soc_ops soc_ops;
/* mpu_oh: used to add/remove MPU initiator from sleepdep list */ staticstruct omap_hwmod *mpu_oh;
/* inited: set to true once the hwmod code is initialized */ staticbool inited;
/* Private functions */
/** * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy * @oh: struct omap_hwmod * * * Load the current value of the hwmod OCP_SYSCONFIG register into the * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no * OCP_SYSCONFIG register or 0 upon success.
*/ staticint _update_sysc_cache(struct omap_hwmod *oh)
{ if (!oh->class->sysc) {
WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name); return -EINVAL;
}
if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
return 0;
}
/** * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register * @v: OCP_SYSCONFIG value to write * @oh: struct omap_hwmod * * * Write @v into the module class' OCP_SYSCONFIG register, if it has * one. No return value.
*/ staticvoid _write_sysconfig(u32 v, struct omap_hwmod *oh)
{ if (!oh->class->sysc) {
WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name); return;
}
/* XXX ensure module interface clock is up */
/* Module might have lost context, always update cache and register */
oh->_sysc_cache = v;
/* * Some IP blocks (such as RTC) require unlocking of IP before * accessing its registers. If a function pointer is present * to unlock, then call it before accessing sysconfig and * call lock after writing sysconfig.
*/ if (oh->class->unlock)
oh->class->unlock(oh);
/** * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v * @oh: struct omap_hwmod * * @standbymode: MIDLEMODE field bits * @v: pointer to register contents to modify * * Update the master standby mode bits in @v to be @standbymode for * the @oh hwmod. Does not write to the hardware. Returns -EINVAL * upon error or 0 upon success.
*/ staticint _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
u32 *v)
{
u32 mstandby_mask;
u8 mstandby_shift;
if (!oh->class->sysc ||
!(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE)) return -EINVAL;
if (!oh->class->sysc->sysc_fields) {
WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); return -EINVAL;
}
/** * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v * @oh: struct omap_hwmod * * @idlemode: SIDLEMODE field bits * @v: pointer to register contents to modify * * Update the slave idle mode bits in @v to be @idlemode for the @oh * hwmod. Does not write to the hardware. Returns -EINVAL upon error * or 0 upon success.
*/ staticint _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
{
u32 sidle_mask;
u8 sidle_shift;
if (!oh->class->sysc ||
!(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE)) return -EINVAL;
if (!oh->class->sysc->sysc_fields) {
WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); return -EINVAL;
}
/** * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v * @oh: struct omap_hwmod * * @clockact: CLOCKACTIVITY field bits * @v: pointer to register contents to modify * * Update the clockactivity mode bits in @v to be @clockact for the * @oh hwmod. Used for additional powersaving on some modules. Does * not write to the hardware. Returns -EINVAL upon error or 0 upon * success.
*/ staticint _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
{
u32 clkact_mask;
u8 clkact_shift;
if (!oh->class->sysc ||
!(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY)) return -EINVAL;
if (!oh->class->sysc->sysc_fields) {
WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); return -EINVAL;
}
/** * _set_softreset: set OCP_SYSCONFIG.SOFTRESET bit in @v * @oh: struct omap_hwmod * * @v: pointer to register contents to modify * * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon * error or 0 upon success.
*/ staticint _set_softreset(struct omap_hwmod *oh, u32 *v)
{
u32 softrst_mask;
if (!oh->class->sysc ||
!(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET)) return -EINVAL;
if (!oh->class->sysc->sysc_fields) {
WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); return -EINVAL;
}
/** * _clear_softreset: clear OCP_SYSCONFIG.SOFTRESET bit in @v * @oh: struct omap_hwmod * * @v: pointer to register contents to modify * * Clear the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon * error or 0 upon success.
*/ staticint _clear_softreset(struct omap_hwmod *oh, u32 *v)
{
u32 softrst_mask;
if (!oh->class->sysc ||
!(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET)) return -EINVAL;
if (!oh->class->sysc->sysc_fields) {
WARN(1, "omap_hwmod: %s: sysc_fields absent for sysconfig class\n",
oh->name); return -EINVAL;
}
/** * _wait_softreset_complete - wait for an OCP softreset to complete * @oh: struct omap_hwmod * to wait on * * Wait until the IP block represented by @oh reports that its OCP * softreset is complete. This can be triggered by software (see * _ocp_softreset()) or by hardware upon returning from off-mode (one * example is HSMMC). Waits for up to MAX_MODULE_SOFTRESET_WAIT * microseconds. Returns the number of microseconds waited.
*/ staticint _wait_softreset_complete(struct omap_hwmod *oh)
{ struct omap_hwmod_class_sysconfig *sysc;
u32 softrst_mask; int c = 0;
/** * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v * @oh: struct omap_hwmod * * * The DMADISABLE bit is a semi-automatic bit present in sysconfig register * of some modules. When the DMA must perform read/write accesses, the * DMADISABLE bit is cleared by the hardware. But when the DMA must stop * for power management, software must set the DMADISABLE bit back to 1. * * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon * error or 0 upon success.
*/ staticint _set_dmadisable(struct omap_hwmod *oh)
{
u32 v;
u32 dmadisable_mask;
if (!oh->class->sysc ||
!(oh->class->sysc->sysc_flags & SYSC_HAS_DMADISABLE)) return -EINVAL;
if (!oh->class->sysc->sysc_fields) {
WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); return -EINVAL;
}
/* clocks must be on for this operation */ if (oh->_state != _HWMOD_STATE_ENABLED) {
pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh->name); return -EINVAL;
}
v = oh->_sysc_cache;
dmadisable_mask =
(0x1 << oh->class->sysc->sysc_fields->dmadisable_shift);
v |= dmadisable_mask;
_write_sysconfig(v, oh);
return 0;
}
/** * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v * @oh: struct omap_hwmod * * @autoidle: desired AUTOIDLE bitfield value (0 or 1) * @v: pointer to register contents to modify * * Update the module autoidle bit in @v to be @autoidle for the @oh * hwmod. The autoidle bit controls whether the module can gate * internal clocks automatically when it isn't doing anything; the * exact function of this bit varies on a per-module basis. This * function does not write to the hardware. Returns -EINVAL upon * error or 0 upon success.
*/ staticint _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
u32 *v)
{
u32 autoidle_mask;
u8 autoidle_shift;
if (!oh->class->sysc ||
!(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE)) return -EINVAL;
if (!oh->class->sysc->sysc_fields) {
WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name); return -EINVAL;
}
/** * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active * @oh: struct omap_hwmod * * * Prevent the hardware module @oh from entering idle while the * hardare module initiator @init_oh is active. Useful when a module * will be accessed by a particular initiator (e.g., if a module will * be accessed by the IVA, there should be a sleepdep between the IVA * initiator and the module). Only applies to modules in smart-idle * mode. If the clockdomain is marked as not needing autodeps, return * 0 without doing anything. Otherwise, returns -EINVAL upon error or * passes along clkdm_add_sleepdep() value upon success.
*/ staticint _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
{ struct clockdomain *clkdm, *init_clkdm;
if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS) return 0;
return clkdm_add_sleepdep(clkdm, init_clkdm);
}
/** * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active * @oh: struct omap_hwmod * * * Allow the hardware module @oh to enter idle while the hardare * module initiator @init_oh is active. Useful when a module will not * be accessed by a particular initiator (e.g., if a module will not * be accessed by the IVA, there should be no sleepdep between the IVA * initiator and the module). Only applies to modules in smart-idle * mode. If the clockdomain is marked as not needing autodeps, return * 0 without doing anything. Returns -EINVAL upon error or passes * along clkdm_del_sleepdep() value upon success.
*/ staticint _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
{ struct clockdomain *clkdm, *init_clkdm;
/** * _init_main_clk - get a struct clk * for the hwmod's main functional clk * @oh: struct omap_hwmod * * * Called from _init_clocks(). Populates the @oh _clk (main * functional clock pointer) if a clock matching the hwmod name is found, * or a main_clk is present. Returns 0 on success or -EINVAL on error.
*/ staticint _init_main_clk(struct omap_hwmod *oh)
{ int ret = 0; struct clk *clk = NULL;
clk = _lookup_clkctrl_clk(oh);
if (!IS_ERR_OR_NULL(clk)) {
pr_debug("%s: mapped main_clk %s for %s\n", __func__,
__clk_get_name(clk), oh->name);
oh->main_clk = __clk_get_name(clk);
oh->_clk = clk;
soc_ops.disable_direct_prcm(oh);
} else { if (!oh->main_clk) return 0;
oh->_clk = clk_get(NULL, oh->main_clk);
}
if (IS_ERR(oh->_clk)) {
pr_warn("omap_hwmod: %s: cannot clk_get main_clk %s\n",
oh->name, oh->main_clk); return -EINVAL;
} /* * HACK: This needs a re-visit once clk_prepare() is implemented * to do something meaningful. Today its just a no-op. * If clk_prepare() is used at some point to do things like * voltage scaling etc, then this would have to be moved to * some point where subsystems like i2c and pmic become * available.
*/
clk_prepare(oh->_clk);
if (!_get_clkdm(oh))
pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n",
oh->name, oh->main_clk);
return ret;
}
/** * _init_interface_clks - get a struct clk * for the hwmod's interface clks * @oh: struct omap_hwmod * * * Called from _init_clocks(). Populates the @oh OCP slave interface * clock pointers. Returns 0 on success or -EINVAL on error.
*/ staticint _init_interface_clks(struct omap_hwmod *oh)
{ struct omap_hwmod_ocp_if *os; struct clk *c; int ret = 0;
list_for_each_entry(os, &oh->slave_ports, node) { if (!os->clk) continue;
c = clk_get(NULL, os->clk); if (IS_ERR(c)) {
pr_warn("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
oh->name, os->clk);
ret = -EINVAL; continue;
}
os->_clk = c; /* * HACK: This needs a re-visit once clk_prepare() is implemented * to do something meaningful. Today its just a no-op. * If clk_prepare() is used at some point to do things like * voltage scaling etc, then this would have to be moved to * some point where subsystems like i2c and pmic become * available.
*/
clk_prepare(os->_clk);
}
return ret;
}
/** * _init_opt_clks - get a struct clk * for the hwmod's optional clocks * @oh: struct omap_hwmod * * * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk * clock pointers. Returns 0 on success or -EINVAL on error.
*/ staticint _init_opt_clks(struct omap_hwmod *oh)
{ struct omap_hwmod_opt_clk *oc; struct clk *c; int i; int ret = 0;
for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
c = clk_get(NULL, oc->clk); if (IS_ERR(c)) {
pr_warn("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
oh->name, oc->clk);
ret = -EINVAL; continue;
}
oc->_clk = c; /* * HACK: This needs a re-visit once clk_prepare() is implemented * to do something meaningful. Today its just a no-op. * If clk_prepare() is used at some point to do things like * voltage scaling etc, then this would have to be moved to * some point where subsystems like i2c and pmic become * available.
*/
clk_prepare(oc->_clk);
}
return ret;
}
staticvoid _enable_optional_clocks(struct omap_hwmod *oh)
{ struct omap_hwmod_opt_clk *oc; int i;
/** * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4 * @oh: struct omap_hwmod * * * Wait for a module @oh to enter slave idle. Returns 0 if the module * does not have an IDLEST bit or if the module successfully enters * slave idle; otherwise, pass along the return value of the * appropriate *_cm*_wait_module_idle() function.
*/ staticint _omap4_wait_target_disable(struct omap_hwmod *oh)
{ if (!oh) return -EINVAL;
if (oh->_int_flags & _HWMOD_NO_MPU_PORT || !oh->clkdm) return 0;
if (oh->flags & HWMOD_NO_IDLEST) return 0;
if (_omap4_clkctrl_managed_by_clkfwk(oh)) return 0;
/** * _save_mpu_port_index - find and save the index to @oh's MPU port * @oh: struct omap_hwmod * * * Determines the array index of the OCP slave port that the MPU uses * to address the device, and saves it into the struct omap_hwmod. * Intended to be called during hwmod registration only. No return * value.
*/ staticvoid __init _save_mpu_port_index(struct omap_hwmod *oh)
{ struct omap_hwmod_ocp_if *os = NULL;
/** * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU * @oh: struct omap_hwmod * * * Given a pointer to a struct omap_hwmod record @oh, return a pointer * to the struct omap_hwmod_ocp_if record that is used by the MPU to * communicate with the IP block. This interface need not be directly * connected to the MPU (and almost certainly is not), but is directly * connected to the IP block represented by @oh. Returns a pointer * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon * error or if there does not appear to be a path from the MPU to this * IP block.
*/ staticstruct omap_hwmod_ocp_if *_find_mpu_rt_port(struct omap_hwmod *oh)
{ if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0) return NULL;
return oh->_mpu_port;
};
/** * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG * @oh: struct omap_hwmod * * * Ensure that the OCP_SYSCONFIG register for the IP block represented * by @oh is set to indicate to the PRCM that the IP block is active. * Usually this means placing the module into smart-idle mode and * smart-standby, but if there is a bug in the automatic idle handling * for the IP block, it may need to be placed into the force-idle or * no-idle variants of these modes. No return value.
*/ staticvoid _enable_sysc(struct omap_hwmod *oh)
{
u8 idlemode, sf;
u32 v; bool clkdm_act; struct clockdomain *clkdm;
if (!oh->class->sysc) return;
/* * Wait until reset has completed, this is needed as the IP * block is reset automatically by hardware in some cases * (off-mode for example), and the drivers require the * IP to be ready when they access it
*/ if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
_enable_optional_clocks(oh);
_wait_softreset_complete(oh); if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
_disable_optional_clocks(oh);
v = oh->_sysc_cache;
sf = oh->class->sysc->sysc_flags;
/* * This is special handling for some IPs like * 32k sync timer. Force them to idle!
*/
clkdm_act = (clkdm && clkdm->flags & CLKDM_ACTIVE_WITH_MPU); if (clkdm_act && !(oh->class->sysc->idlemodes &
(SIDLE_SMART | SIDLE_SMART_WKUP)))
idlemode = HWMOD_IDLEMODE_FORCE;
/* * XXX The clock framework should handle this, by * calling into this code. But this must wait until the * clock structures are tagged with omap_hwmod entries
*/ if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
(sf & SYSC_HAS_CLOCKACTIVITY))
_set_clockactivity(oh, CLOCKACT_TEST_ICLK, &v);
_write_sysconfig(v, 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);
}
}
/** * _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 * idle; otherwise, configure it for smart-idle. If module is marked * as SWSUP_MSUSPEND, force the module into master standby; otherwise, * configure it for smart-standby. No return value.
*/ staticvoid _idle_sysc(struct omap_hwmod *oh)
{
u8 idlemode, sf;
u32 v;
if (!oh->class->sysc) return;
v = oh->_sysc_cache;
sf = oh->class->sysc->sysc_flags;
if (sf & SYSC_HAS_SIDLEMODE) { if (oh->flags & HWMOD_SWSUP_SIDLE) {
idlemode = HWMOD_IDLEMODE_FORCE;
} else { if (sf & SYSC_HAS_ENAWAKEUP)
_enable_wakeup(oh, &v); if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
idlemode = HWMOD_IDLEMODE_SMART_WKUP; else
idlemode = HWMOD_IDLEMODE_SMART;
}
_set_slave_idlemode(oh, idlemode, &v);
}
/* If the cached value is the same as the new value, skip the write */ if (oh->_sysc_cache != v)
_write_sysconfig(v, oh);
}
/** * _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.
*/ staticvoid _shutdown_sysc(struct omap_hwmod *oh)
{
u32 v;
u8 sf;
if (!oh->class->sysc) return;
v = oh->_sysc_cache;
sf = oh->class->sysc->sysc_flags;
if (sf & SYSC_HAS_SIDLEMODE)
_set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
if (sf & SYSC_HAS_MIDLEMODE)
_set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
if (sf & SYSC_HAS_AUTOIDLE)
_set_module_autoidle(oh, 1, &v);
_write_sysconfig(v, oh);
}
/** * _lookup - find an omap_hwmod by name * @name: find an omap_hwmod by name * * Return a pointer to an omap_hwmod by name, or NULL if not found.
*/ staticstruct omap_hwmod *_lookup(constchar *name)
{ struct omap_hwmod *oh, *temp_oh;
/** * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod * @oh: struct omap_hwmod * * * Convert a clockdomain name stored in a struct omap_hwmod into a * clockdomain pointer, and save it into the struct omap_hwmod. * Return -EINVAL if the clkdm_name lookup failed.
*/ staticint _init_clkdm(struct omap_hwmod *oh)
{ if (!oh->clkdm_name) {
pr_debug("omap_hwmod: %s: missing clockdomain\n", oh->name); return 0;
}
oh->clkdm = clkdm_lookup(oh->clkdm_name); if (!oh->clkdm) {
pr_warn("omap_hwmod: %s: could not associate to clkdm %s\n",
oh->name, oh->clkdm_name); return 0;
}
pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
oh->name, oh->clkdm_name);
return 0;
}
/** * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as * well the clockdomain. * @oh: struct omap_hwmod * * @np: device_node mapped to this hwmod * * Called by omap_hwmod_setup_*() (after omap2_clk_init()). * Resolves all clock names embedded in the hwmod. Returns 0 on * success, or a negative error code on failure.
*/ staticint _init_clocks(struct omap_hwmod *oh, struct device_node *np)
{ int ret = 0;
if (oh->_state != _HWMOD_STATE_REGISTERED) return 0;
pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
if (soc_ops.init_clkdm)
ret |= soc_ops.init_clkdm(oh);
ret |= _init_main_clk(oh);
ret |= _init_interface_clks(oh);
ret |= _init_opt_clks(oh);
/** * _lookup_hardreset - fill register bit info for this hwmod/reset line * @oh: struct omap_hwmod * * @name: name of the reset line in the context of this hwmod * @ohri: struct omap_hwmod_rst_info * that this function will fill in * * Return the bit position of the reset line that match the * input name. Return -ENOENT if not found.
*/ staticint _lookup_hardreset(struct omap_hwmod *oh, constchar *name, struct omap_hwmod_rst_info *ohri)
{ int i;
for (i = 0; i < oh->rst_lines_cnt; i++) { constchar *rst_line = oh->rst_lines[i].name; if (!strcmp(rst_line, name)) {
ohri->rst_shift = oh->rst_lines[i].rst_shift;
ohri->st_shift = oh->rst_lines[i].st_shift;
pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
oh->name, __func__, rst_line, ohri->rst_shift,
ohri->st_shift);
return 0;
}
}
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. * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of * asserting the hardreset line on the currently-booted SoC, or passes * along the return value from _lookup_hardreset() or the SoC's * assert_hardreset code.
*/ staticint _assert_hardreset(struct omap_hwmod *oh, constchar *name)
{ struct omap_hwmod_rst_info ohri; int ret = -EINVAL;
if (!oh) return -EINVAL;
if (!soc_ops.assert_hardreset) return -ENOSYS;
ret = _lookup_hardreset(oh, name, &ohri); if (ret < 0) return ret;
ret = soc_ops.assert_hardreset(oh, &ohri);
return ret;
}
/** * _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, -ENOSYS if we have no way of * deasserting the hardreset line on the currently-booted SoC, or passes * along the return value from _lookup_hardreset() or the SoC's * deassert_hardreset code.
*/ staticint _deassert_hardreset(struct omap_hwmod *oh, constchar *name)
{ struct omap_hwmod_rst_info ohri; int ret = -EINVAL;
if (!oh) return -EINVAL;
if (!soc_ops.deassert_hardreset) return -ENOSYS;
ret = _lookup_hardreset(oh, name, &ohri); if (ret < 0) return ret;
if (oh->clkdm) { /* * A clockdomain must be in SW_SUP otherwise reset * might not be completed. The clockdomain can be set * in HW_AUTO only when the module become ready.
*/
clkdm_deny_idle(oh->clkdm);
ret = clkdm_hwmod_enable(oh->clkdm, oh); if (ret) {
WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
oh->name, oh->clkdm->name, ret); return ret;
}
}
_enable_clocks(oh); if (soc_ops.enable_module)
soc_ops.enable_module(oh);
ret = soc_ops.deassert_hardreset(oh, &ohri);
if (soc_ops.disable_module)
soc_ops.disable_module(oh);
_disable_clocks(oh);
if (ret == -EBUSY)
pr_warn("omap_hwmod: %s: failed to hardreset\n", oh->name);
if (oh->clkdm) { /* * Set the clockdomain to HW_AUTO, assuming that the * previous state was HW_AUTO.
*/
clkdm_allow_idle(oh->clkdm);
clkdm_hwmod_disable(oh->clkdm, oh);
}
return ret;
}
/** * _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. Returns -EINVAL if @oh is * null, -ENOSYS if we have no way of reading the hardreset line * status on the currently-booted SoC, or passes along the return * value from _lookup_hardreset() or the SoC's is_hardreset_asserted * code.
*/ staticint _read_hardreset(struct omap_hwmod *oh, constchar *name)
{ struct omap_hwmod_rst_info ohri; int ret = -EINVAL;
if (!oh) return -EINVAL;
if (!soc_ops.is_hardreset_asserted) return -ENOSYS;
ret = _lookup_hardreset(oh, name, &ohri); if (ret < 0) return ret;
/** * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset * @oh: struct omap_hwmod * * * If all hardreset lines associated with @oh are asserted, then return true. * Otherwise, if part of @oh is out hardreset 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 its hardreset line is set.
*/ staticbool _are_all_hardreset_lines_asserted(struct omap_hwmod *oh)
{ int i, rst_cnt = 0;
if (oh->rst_lines_cnt == 0) returnfalse;
for (i = 0; i < oh->rst_lines_cnt; i++) if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
rst_cnt++;
if (oh->rst_lines_cnt == rst_cnt) returntrue;
returnfalse;
}
/** * _are_any_hardreset_lines_asserted - return true if any part of @oh is * hard-reset * @oh: struct omap_hwmod * * * If any hardreset lines associated with @oh are asserted, then * return true. Otherwise, if no hardreset lines associated with @oh * are asserted, or if @oh has no hardreset lines, then return false. * This function is used to avoid executing some parts of the IP block * enable/disable sequence if any hardreset line is set.
*/ staticbool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh)
{ int rst_cnt = 0; int i;
for (i = 0; i < oh->rst_lines_cnt && rst_cnt == 0; i++) if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
rst_cnt++;
return (rst_cnt) ? true : 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.
*/ staticint _omap4_disable_module(struct omap_hwmod *oh)
{ int v;
if (!oh->clkdm || !oh->prcm.omap4.modulemode ||
_omap4_clkctrl_managed_by_clkfwk(oh)) return -EINVAL;
/* * Since integration code might still be doing something, only * disable if all lines are under hardreset.
*/ 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 -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 * use the SYSCONFIG softreset bit to provide the status. * * Note that some IP like McBSP do have reset control but don't have * reset status.
*/ staticint _ocp_softreset(struct omap_hwmod *oh)
{
u32 v; int c = 0; int ret = 0;
if (!oh->class->sysc ||
!(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET)) return -ENOENT;
/* clocks must be on for this operation */ if (oh->_state != _HWMOD_STATE_ENABLED) {
pr_warn("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 via OCP SOFTRESET\n", oh->name);
v = oh->_sysc_cache;
ret = _set_softreset(oh, &v); if (ret) goto dis_opt_clks;
_write_sysconfig(v, oh);
if (oh->class->sysc->srst_udelay)
udelay(oh->class->sysc->srst_udelay);
c = _wait_softreset_complete(oh); if (c == MAX_MODULE_SOFTRESET_WAIT) {
pr_warn("omap_hwmod: %s: softreset failed (waited %d usec)\n",
oh->name, MAX_MODULE_SOFTRESET_WAIT);
ret = -ETIMEDOUT; goto dis_opt_clks;
} else {
pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
}
ret = _clear_softreset(oh, &v); if (ret) goto dis_opt_clks;
_write_sysconfig(v, oh);
/* * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from * _wait_target_ready() or _reset()
*/
dis_opt_clks: if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
_disable_optional_clocks(oh);
return ret;
}
/** * _reset - reset an omap_hwmod * @oh: struct omap_hwmod * * * 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. * * _set_dmadisable() is called to set the DMADISABLE bit so that it * does not prevent idling of the system. This is necessary for cases * where ROMCODE/BOOTLOADER uses dma and transfers control to the * kernel without disabling dma. * * 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.
*/ staticint _reset(struct omap_hwmod *oh)
{ int i, r;
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;
}
}
_set_dmadisable(oh);
/* * 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;
}
/** * _omap4_update_context_lost - increment hwmod context loss counter if * hwmod context was lost, and clear hardware context loss reg * @oh: hwmod to check for context loss * * If the PRCM indicates that the hwmod @oh lost context, increment * our in-memory context loss counter, and clear the RM_*_CONTEXT * bits. No return value.
*/ staticvoid _omap4_update_context_lost(struct omap_hwmod *oh)
{ if (oh->prcm.omap4.flags & HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT) return;
if (!prm_was_any_context_lost_old(oh->clkdm->pwrdm.ptr->prcm_partition,
oh->clkdm->pwrdm.ptr->prcm_offs,
oh->prcm.omap4.context_offs)) return;
/** * _omap4_get_context_lost - get context loss counter for a hwmod * @oh: hwmod to get context loss counter for * * Returns the in-memory context loss counter for a hwmod.
*/ staticint _omap4_get_context_lost(struct omap_hwmod *oh)
{ return oh->prcm.omap4.context_lost_counter;
}
/** * _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. Returns -EINVAL if the hwmod is in the wrong * state or passes along the return value of _wait_target_ready().
*/ staticint _enable(struct omap_hwmod *oh)
{ int 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.
*/ if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
oh->_int_flags &= ~_HWMOD_SKIP_ENABLE; return 0;
}
if (oh->_state != _HWMOD_STATE_INITIALIZED &&
oh->_state != _HWMOD_STATE_IDLE &&
oh->_state != _HWMOD_STATE_DISABLED) {
WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
oh->name); return -EINVAL;
}
/* * If an IP block contains HW reset lines and all 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 (_are_all_hardreset_lines_asserted(oh)) return 0;
_add_initiator_dep(oh, mpu_oh);
if (oh->clkdm) { /* * A clockdomain must be in SW_SUP before enabling * completely the module. The clockdomain can be set * in HW_AUTO only when the module become ready.
*/
clkdm_deny_idle(oh->clkdm);
r = clkdm_hwmod_enable(oh->clkdm, oh); if (r) {
WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
oh->name, oh->clkdm->name, r); return r;
}
}
_enable_clocks(oh); if (soc_ops.enable_module)
soc_ops.enable_module(oh); if (oh->flags & HWMOD_BLOCK_WFI)
cpu_idle_poll_ctrl(true);
if (soc_ops.update_context_lost)
soc_ops.update_context_lost(oh);
r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) :
-EINVAL; if (oh->clkdm && !(oh->flags & HWMOD_CLKDM_NOAUTO))
clkdm_allow_idle(oh->clkdm);
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);
_enable_sysc(oh);
}
} else { if (soc_ops.disable_module)
soc_ops.disable_module(oh);
_disable_clocks(oh);
pr_err("omap_hwmod: %s: _wait_target_ready failed: %d\n",
oh->name, r);
if (oh->clkdm)
clkdm_hwmod_disable(oh->clkdm, oh);
}
return r;
}
/** * _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.
*/ staticint _idle(struct omap_hwmod *oh)
{ if (oh->flags & HWMOD_NO_IDLE) {
oh->_int_flags |= _HWMOD_SKIP_ENABLE; return 0;
}
pr_debug("omap_hwmod: %s: idling\n", oh->name);
if (_are_all_hardreset_lines_asserted(oh)) return 0;
if (oh->_state != _HWMOD_STATE_ENABLED) {
WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
oh->name); return -EINVAL;
}
if (oh->class->sysc)
_idle_sysc(oh);
_del_initiator_dep(oh, mpu_oh);
/* * If HWMOD_CLKDM_NOAUTO is set then we don't * deny idle the clkdm again since idle was already denied * in _enable()
*/ if (oh->clkdm && !(oh->flags & HWMOD_CLKDM_NOAUTO))
clkdm_deny_idle(oh->clkdm);
if (oh->flags & HWMOD_BLOCK_WFI)
cpu_idle_poll_ctrl(false); if (soc_ops.disable_module)
soc_ops.disable_module(oh);
/* * The module must be in idle mode before disabling any parents * clocks. Otherwise, the parent clock might be disabled before * the module transition is done, and thus will prevent the * transition to complete properly.
*/
_disable_clocks(oh); if (oh->clkdm) {
clkdm_allow_idle(oh->clkdm);
clkdm_hwmod_disable(oh->clkdm, oh);
}
oh->_state = _HWMOD_STATE_IDLE;
return 0;
}
/** * _shutdown - shutdown an omap_hwmod * @oh: struct omap_hwmod * * * Shut down an omap_hwmod @oh. This should be called when the driver * used for the hwmod is removed or unloaded or if the driver is not * used by the system. Returns -EINVAL if the hwmod is in the wrong * state or returns 0.
*/ staticint _shutdown(struct omap_hwmod *oh)
{ int ret, i;
u8 prev_state;
if (_are_all_hardreset_lines_asserted(oh)) return 0;
if (oh->_state != _HWMOD_STATE_IDLE &&
oh->_state != _HWMOD_STATE_ENABLED) {
WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
oh->name); return -EINVAL;
}
if (oh->class->pre_shutdown) {
prev_state = oh->_state; if (oh->_state == _HWMOD_STATE_IDLE)
_enable(oh);
ret = oh->class->pre_shutdown(oh); if (ret) { if (prev_state == _HWMOD_STATE_IDLE)
_idle(oh); return ret;
}
}
if (oh->class->sysc) { if (oh->_state == _HWMOD_STATE_IDLE)
_enable(oh);
_shutdown_sysc(oh);
}
/* 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 */ if (oh->flags & HWMOD_BLOCK_WFI)
cpu_idle_poll_ctrl(false); if (soc_ops.disable_module)
soc_ops.disable_module(oh);
_disable_clocks(oh); if (oh->clkdm)
clkdm_hwmod_disable(oh->clkdm, oh);
} /* XXX Should this code also force-disable the optional clocks? */
for (i = 0; i < oh->rst_lines_cnt; i++)
_assert_hardreset(oh, oh->rst_lines[i].name);
oh->_state = _HWMOD_STATE_DISABLED;
return 0;
}
staticint of_dev_find_hwmod(struct device_node *np, struct omap_hwmod *oh)
{ int count, i, res; constchar *p;
count = of_property_count_strings(np, "ti,hwmods"); if (count < 1) return -ENODEV;
for (i = 0; i < count; i++) {
res = of_property_read_string_index(np, "ti,hwmods",
i, &p); if (res) continue; if (!strcmp(p, oh->name)) {
pr_debug("omap_hwmod: dt %pOFn[%i] uses hwmod %s\n",
np, i, oh->name); return i;
}
}
return -ENODEV;
}
/** * of_dev_hwmod_lookup - look up needed hwmod from dt blob * @np: struct device_node * * @oh: struct omap_hwmod * * @index: index of the entry found * @found: struct device_node * found or NULL * * Parse the dt blob and find out needed hwmod. Recursive function is * implemented to take care hierarchical dt blob parsing. * Return: Returns 0 on success, -ENODEV when not found.
*/ staticint of_dev_hwmod_lookup(struct device_node *np, struct omap_hwmod *oh, int *index, struct device_node **found)
{ struct device_node *np0 = NULL; int res;
res = of_dev_find_hwmod(np, oh); if (res >= 0) {
*found = np;
*index = res; return 0;
}
for_each_child_of_node(np, np0) { struct device_node *fc; int i;
/** * omap_hwmod_fix_mpu_rt_idx - fix up mpu_rt_idx register offsets * * @oh: struct omap_hwmod * * @np: struct device_node * * * Fix up module register offsets for modules with mpu_rt_idx. * Only needed for cpsw with interconnect target module defined * in device tree while still using legacy hwmod platform data * for rev, sysc and syss registers. * * Can be removed when all cpsw hwmod platform data has been * dropped.
*/ staticvoid omap_hwmod_fix_mpu_rt_idx(struct omap_hwmod *oh, struct device_node *np, struct resource *res)
{ struct device_node *child = NULL; int error;
child = of_get_next_child(np, child); if (!child) return;
/** * omap_hwmod_parse_module_range - map module IO range from device tree * @oh: struct omap_hwmod * * @np: struct device_node * * * Parse the device tree range an interconnect target module provides * for it's child device IP blocks. This way we can support the old * "ti,hwmods" property with just dts data without a need for platform * data for IO resources. And we don't need all the child IP device * nodes available in the dts.
*/ int omap_hwmod_parse_module_range(struct omap_hwmod *oh, struct device_node *np, struct resource *res)
{ struct property *prop; constchar *name; int err;
of_property_for_each_string(np, "compatible", prop, name) if (!strncmp("ti,sysc-", name, 8)) break;
if (!name) return -ENOENT;
err = of_range_to_resource(np, 0, res); if (err) return err;
pr_debug("omap_hwmod: %s %pOFn at %pR\n",
oh->name, np, res);
if (oh && oh->mpu_rt_idx) {
omap_hwmod_fix_mpu_rt_idx(oh, np, res);
return 0;
}
return 0;
}
/** * _init_mpu_rt_base - populate the virtual address for a hwmod * @oh: struct omap_hwmod * to locate the virtual address * @data: (unused, caller should pass NULL) * @index: index of the reg entry iospace in device tree * @np: struct device_node * of the IP block's device node in the DT data * * 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. * * If SYSC access is not needed, the registers will not be remapped * and non-availability of MPU access is not treated as an error. * * Returns 0 on success, -EINVAL if an invalid hwmod is passed, and * -ENXIO on absent or invalid register target address space.
*/ staticint __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data, int index, struct device_node *np)
{ void __iomem *va_start = NULL; struct resource res; int error;
if (!oh) return -EINVAL;
_save_mpu_port_index(oh);
/* if we don't need sysc access we don't need to ioremap */ if (!oh->class->sysc) return 0;
/* we can't continue without MPU PORT if we need sysc access */ if (oh->_int_flags & _HWMOD_NO_MPU_PORT) return -ENXIO;
if (!np) {
pr_err("omap_hwmod: %s: no dt node\n", oh->name); return -ENXIO;
}
/* Do we have a dts range for the interconnect target module? */
error = omap_hwmod_parse_module_range(oh, np, &res); if (!error)
va_start = ioremap(res.start, resource_size(&res));
/* No ranges, rely on device reg entry */ if (!va_start)
va_start = of_iomap(np, index + oh->mpu_rt_idx); if (!va_start) {
pr_err("omap_hwmod: %s: Missing dt reg%i for %pOF\n",
oh->name, index, np); return -ENXIO;
}
pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
oh->name, va_start);
oh->_mpu_rt_va = va_start; return 0;
}
staticvoid __init parse_module_flags(struct omap_hwmod *oh, struct device_node *np)
{ if (of_property_read_bool(np, "ti,no-reset-on-init"))
oh->flags |= HWMOD_INIT_NO_RESET; if (of_property_read_bool(np, "ti,no-idle-on-init"))
oh->flags |= HWMOD_INIT_NO_IDLE; if (of_property_read_bool(np, "ti,no-idle"))
oh->flags |= HWMOD_NO_IDLE;
}
/** * _init - initialize internal data for the hwmod @oh * @oh: struct omap_hwmod * * @data: (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 if the hwmod's * address space is not defined, or -EINVAL upon failure.
*/ staticint __init _init(struct omap_hwmod *oh, void *data)
{ int r, index; struct device_node *np = NULL; struct device_node *bus;
if (oh->_state != _HWMOD_STATE_REGISTERED) return 0;
bus = of_find_node_by_name(NULL, "ocp"); if (!bus) return -ENODEV;
r = of_dev_hwmod_lookup(bus, oh, &index, &np); if (r)
pr_debug("omap_hwmod: %s missing dt data\n", oh->name); elseif (np && index)
pr_warn("omap_hwmod: %s using broken dt data from %pOFn\n",
oh->name, np);
r = _init_mpu_rt_base(oh, NULL, index, np); if (r < 0) {
WARN(1, "omap_hwmod: %s: doesn't have mpu register target base\n",
oh->name); return 0;
}
r = _init_clocks(oh, np); if (r < 0) {
WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name); return -EINVAL;
}
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.