arm/mach-keystone/psc.c

1 // SPDX-License-Identifier: GPL-2.0+
5  * (C) Copyright 2012-2014
16  * psc_delay() - delay for psc
27  * psc_wait() - Wait for end of transitional state
34  * Return: 0 when the domain is free. Returns -1 if a timeout occurred waiting
59 		return -1;  in psc_wait()
65  * psc_get_domain_num() - Get the domain number
80  * psc_set_state() - powers up/down a module
87  * be left in the power on state. Multiple modules can exist in a power
88  * domain, so powering down the domain based on a single module is not done.
90  * Return: 0 on success, -1 if the module can't be powered up, or if there is a
91  * timeout waiting for the transition.
103 	 * Get the power domain associated with the module number, and reset  in psc_set_state()
110 	/* Wait for the status of the domain/module to be non-transitional */  in psc_set_state()
112 		return -1;  in psc_set_state()
118 	 * Set the next state of the power domain to on. It's OK if the domain  in psc_set_state()
119 	 * is always on. This code will not ever power down a domain, so no  in psc_set_state()
140 	/* Wait on the complete */  in psc_set_state()
145  * psc_enable_module() - power up a module
151  * Return: 0 on success, -1 if the module can't be powered up, or
152  * if there is a timeout waiting for the transition.
159 	/* Set the bit to apply reset */  in psc_enable_module()
168  * psc_disable_module() - Power down a module
171  * Return: 0 on success, -1 on failure or timeout.
177 	/* Set the bit to apply reset */  in psc_disable_module()
188  * psc_set_reset_iso() - Set the reset isolation bit in mdctl
191  * The reset isolation enable bit is set. The state of the module is not
194  * Return: 0 if the module config showed that reset isolation is supported.
203 	/* Set the reset isolation bit */  in psc_set_reset_iso()
216  * psc_disable_domain() - Disable a power domain
237  * psc_module_keep_in_reset_enabled() - Keep module in enabled,in-reset state
239  * @gate_clocks: Can the clocks be gated on this module?
241  * Enable the module, but do not release the module from local reset. This is
242  * necessary for many processor systems on keystone SoCs to allow for system
244  * from reset.
251 	int timeout = 100000;  in psc_module_keep_in_reset_enabled()  local
256 	/* Should be set 0 to assert Local reset */  in psc_module_keep_in_reset_enabled()
264 	/* Clear Module reset */  in psc_module_keep_in_reset_enabled()
277 	while (timeout) {  in psc_module_keep_in_reset_enabled()
284 		timeout--;  in psc_module_keep_in_reset_enabled()
287 	if (!timeout) {  in psc_module_keep_in_reset_enabled()
290 		return -ETIMEDOUT;  in psc_module_keep_in_reset_enabled()
296  * psc_module_release_from_reset() - Release the module from reset
300  * Allowing the module to be released from reset once all required inits are
308 	int timeout = 100000;  in psc_module_release_from_reset()  local
313 	/* Should be set to 1 to de-assert Local reset */  in psc_module_release_from_reset()
321 	while (timeout) {  in psc_module_release_from_reset()
328 		timeout--;  in psc_module_release_from_reset()
331 	if (!timeout) {  in psc_module_release_from_reset()
334 		return -ETIMEDOUT;  in psc_module_release_from_reset()