diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/arm/mach-omap2/omap_hwmod.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/mach-omap2/omap_hwmod.c | 2790 |
1 files changed, 0 insertions, 2790 deletions
diff --git a/ANDROID_3.4.5/arch/arm/mach-omap2/omap_hwmod.c b/ANDROID_3.4.5/arch/arm/mach-omap2/omap_hwmod.c deleted file mode 100644 index 7144ae65..00000000 --- a/ANDROID_3.4.5/arch/arm/mach-omap2/omap_hwmod.c +++ /dev/null @@ -1,2790 +0,0 @@ -/* - * omap_hwmod implementation for OMAP2/3/4 - * - * Copyright (C) 2009-2011 Nokia Corporation - * Copyright (C) 2011 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 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * 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) - * - 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 - -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/io.h> -#include <linux/clk.h> -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/list.h> -#include <linux/mutex.h> -#include <linux/spinlock.h> -#include <linux/slab.h> - -#include "common.h" -#include <plat/cpu.h> -#include "clockdomain.h" -#include "powerdomain.h" -#include <plat/clock.h> -#include <plat/omap_hwmod.h> -#include <plat/prcm.h> - -#include "cm2xxx_3xxx.h" -#include "cminst44xx.h" -#include "prm2xxx_3xxx.h" -#include "prm44xx.h" -#include "prminst44xx.h" -#include "mux.h" - -/* 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" - -/* omap_hwmod_list contains all registered struct omap_hwmods */ -static LIST_HEAD(omap_hwmod_list); - -/* mpu_oh: used to add/remove MPU initiator from sleepdep list */ -static struct omap_hwmod *mpu_oh; - - -/* 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. - */ -static int _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; - } - - /* XXX ensure module interface clock is up */ - - 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; - - 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. - */ -static void _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; - omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs); -} - -/** - * _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. - */ -static int _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; - } - - mstandby_shift = oh->class->sysc->sysc_fields->midle_shift; - mstandby_mask = (0x3 << mstandby_shift); - - *v &= ~mstandby_mask; - *v |= __ffs(standbymode) << mstandby_shift; - - return 0; -} - -/** - * _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. - */ -static int _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; - } - - sidle_shift = oh->class->sysc->sysc_fields->sidle_shift; - sidle_mask = (0x3 << sidle_shift); - - *v &= ~sidle_mask; - *v |= __ffs(idlemode) << sidle_shift; - - return 0; -} - -/** - * _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. - */ -static int _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; - } - - clkact_shift = oh->class->sysc->sysc_fields->clkact_shift; - clkact_mask = (0x3 << clkact_shift); - - *v &= ~clkact_mask; - *v |= clockact << clkact_shift; - - return 0; -} - -/** - * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits 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. - */ -static int _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; - } - - softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift); - - *v |= softrst_mask; - - 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. - */ -static int _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; - } - - autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift; - autoidle_mask = (0x1 << autoidle_shift); - - *v &= ~autoidle_mask; - *v |= autoidle << autoidle_shift; - - return 0; -} - -/** - * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux - * @oh: struct omap_hwmod * - * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable - * - * Set or clear the I/O pad wakeup flag in the mux entries for the - * hwmod @oh. This function changes the @oh->mux->pads_dynamic array - * in memory. If the hwmod is currently idled, and the new idle - * values don't match the previous ones, this function will also - * update the SCM PADCTRL registers. Otherwise, if the hwmod is not - * currently idled, this function won't touch the hardware: the new - * mux settings are written to the SCM PADCTRL registers when the - * hwmod is idled. No return value. - */ -static void _set_idle_ioring_wakeup(struct omap_hwmod *oh, bool set_wake) -{ - struct omap_device_pad *pad; - bool change = false; - u16 prev_idle; - int j; - - if (!oh->mux || !oh->mux->enabled) - return; - - for (j = 0; j < oh->mux->nr_pads_dynamic; j++) { - pad = oh->mux->pads_dynamic[j]; - - if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP)) - continue; - - prev_idle = pad->idle; - - if (set_wake) - pad->idle |= OMAP_WAKEUP_EN; - else - pad->idle &= ~OMAP_WAKEUP_EN; - - if (prev_idle != pad->idle) - change = true; - } - - if (change && oh->_state == _HWMOD_STATE_IDLE) - omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE); -} - -/** - * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware - * @oh: struct omap_hwmod * - * - * Allow the hardware module @oh to send wakeups. Returns -EINVAL - * upon error or 0 upon success. - */ -static int _enable_wakeup(struct omap_hwmod *oh, u32 *v) -{ - if (!oh->class->sysc || - !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) || - (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) || - (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP))) - 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; - } - - if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) - *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift; - - if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) - _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v); - if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP) - _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v); - - /* XXX test pwrdm_get_wken for this hwmod's subsystem */ - - oh->_int_flags |= _HWMOD_WAKEUP_ENABLED; - - return 0; -} - -/** - * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware - * @oh: struct omap_hwmod * - * - * Prevent the hardware module @oh to send wakeups. Returns -EINVAL - * upon error or 0 upon success. - */ -static int _disable_wakeup(struct omap_hwmod *oh, u32 *v) -{ - if (!oh->class->sysc || - !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) || - (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) || - (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP))) - 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; - } - - if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) - *v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift); - - if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) - _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v); - if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP) - _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v); - - /* XXX test pwrdm_get_wken for this hwmod's subsystem */ - - oh->_int_flags &= ~_HWMOD_WAKEUP_ENABLED; - - return 0; -} - -/** - * _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. - */ -static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh) -{ - if (!oh->_clk) - return -EINVAL; - - if (oh->_clk->clkdm && oh->_clk->clkdm->flags & CLKDM_NO_AUTODEPS) - return 0; - - return clkdm_add_sleepdep(oh->_clk->clkdm, init_oh->_clk->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. - */ -static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh) -{ - if (!oh->_clk) - return -EINVAL; - - if (oh->_clk->clkdm && oh->_clk->clkdm->flags & CLKDM_NO_AUTODEPS) - return 0; - - return clkdm_del_sleepdep(oh->_clk->clkdm, init_oh->_clk->clkdm); -} - -/** - * _init_main_clk - get a struct clk * for the the hwmod's main functional clk - * @oh: struct omap_hwmod * - * - * Called from _init_clocks(). Populates the @oh _clk (main - * functional clock pointer) if a main_clk is present. Returns 0 on - * success or -EINVAL on error. - */ -static int _init_main_clk(struct omap_hwmod *oh) -{ - int ret = 0; - - if (!oh->main_clk) - return 0; - - oh->_clk = omap_clk_get_by_name(oh->main_clk); - if (!oh->_clk) { - pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n", - oh->name, oh->main_clk); - return -EINVAL; - } - - if (!oh->_clk->clkdm) - pr_warning("omap_hwmod: %s: missing clockdomain for %s.\n", - oh->main_clk, oh->_clk->name); - - return ret; -} - -/** - * _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 - * clock pointers. Returns 0 on success or -EINVAL on error. - */ -static int _init_interface_clks(struct omap_hwmod *oh) -{ - struct clk *c; - int i; - int ret = 0; - - if (oh->slaves_cnt == 0) - return 0; - - for (i = 0; i < oh->slaves_cnt; i++) { - struct omap_hwmod_ocp_if *os = oh->slaves[i]; - - if (!os->clk) - continue; - - c = omap_clk_get_by_name(os->clk); - if (!c) { - pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n", - oh->name, os->clk); - ret = -EINVAL; - } - os->_clk = c; - } - - return ret; -} - -/** - * _init_opt_clk - get a struct clk * for the 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. - */ -static int _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 = omap_clk_get_by_name(oc->clk); - if (!c) { - pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n", - oh->name, oc->clk); - ret = -EINVAL; - } - oc->_clk = c; - } - - return ret; -} - -/** - * _enable_clocks - enable hwmod main clock and interface clocks - * @oh: struct omap_hwmod * - * - * Enables all clocks necessary for register reads and writes to succeed - * on the hwmod @oh. Returns 0. - */ -static int _enable_clocks(struct omap_hwmod *oh) -{ - int i; - - pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name); - - if (oh->_clk) - clk_enable(oh->_clk); - - 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 (c && (os->flags & OCPIF_SWSUP_IDLE)) - clk_enable(c); - } - } - - /* The opt clocks are controlled by the device driver. */ - - return 0; -} - -/** - * _disable_clocks - disable hwmod main clock and interface clocks - * @oh: struct omap_hwmod * - * - * Disables the hwmod @oh main functional and interface clocks. Returns 0. - */ -static int _disable_clocks(struct omap_hwmod *oh) -{ - int i; - - pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name); - - if (oh->_clk) - clk_disable(oh->_clk); - - 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 (c && (os->flags & OCPIF_SWSUP_IDLE)) - clk_disable(c); - } - } - - /* The opt clocks are controlled by the device driver. */ - - 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); - } -} - -/** - * _enable_module - enable CLKCTRL modulemode on OMAP4 - * @oh: struct omap_hwmod * - * - * Enables the PRCM module mode related to the hwmod @oh. - * No return value. - */ -static void _enable_module(struct omap_hwmod *oh) -{ - /* The module mode does not exist prior OMAP4 */ - if (cpu_is_omap24xx() || cpu_is_omap34xx()) - return; - - if (!oh->clkdm || !oh->prcm.omap4.modulemode) - return; - - pr_debug("omap_hwmod: %s: _enable_module: %d\n", - oh->name, oh->prcm.omap4.modulemode); - - omap4_cminst_module_enable(oh->prcm.omap4.modulemode, - oh->clkdm->prcm_partition, - oh->clkdm->cm_inst, - oh->clkdm->clkdm_offs, - oh->prcm.omap4.clkctrl_offs); -} - -/** - * _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. - */ -static int _omap4_wait_target_disable(struct omap_hwmod *oh) -{ - if (!cpu_is_omap44xx()) - return 0; - - if (!oh) - return -EINVAL; - - if (oh->_int_flags & _HWMOD_NO_MPU_PORT) - return 0; - - if (oh->flags & HWMOD_NO_IDLEST) - return 0; - - return omap4_cminst_wait_module_idle(oh->clkdm->prcm_partition, - oh->clkdm->cm_inst, - oh->clkdm->clkdm_offs, - 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 - * - * Count and return the number of MPU IRQs associated with the hwmod - * @oh. Used to allocate struct resource data. Returns 0 if @oh is - * NULL. - */ -static int _count_mpu_irqs(struct omap_hwmod *oh) -{ - struct omap_hwmod_irq_info *ohii; - int i = 0; - - if (!oh || !oh->mpu_irqs) - return 0; - - do { - ohii = &oh->mpu_irqs[i++]; - } while (ohii->irq != -1); - - return i-1; -} - -/** - * _count_sdma_reqs - count the number of SDMA request lines associated with @oh - * @oh: struct omap_hwmod *oh - * - * Count and return the number of SDMA request lines associated with - * the hwmod @oh. Used to allocate struct resource data. Returns 0 - * if @oh is NULL. - */ -static int _count_sdma_reqs(struct omap_hwmod *oh) -{ - struct omap_hwmod_dma_info *ohdi; - int i = 0; - - if (!oh || !oh->sdma_reqs) - return 0; - - do { - ohdi = &oh->sdma_reqs[i++]; - } while (ohdi->dma_req != -1); - - return i-1; -} - -/** - * _count_ocp_if_addr_spaces - count the number of address space entries for @oh - * @oh: struct omap_hwmod *oh - * - * Count and return the number of address space ranges associated with - * the hwmod @oh. Used to allocate struct resource data. Returns 0 - * if @oh is NULL. - */ -static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if *os) -{ - struct omap_hwmod_addr_space *mem; - int i = 0; - - if (!os || !os->addr) - return 0; - - do { - mem = &os->addr[i++]; - } while (mem->pa_start != mem->pa_end); - - return i-1; -} - -/** - * _find_mpu_port_index - find hwmod OCP slave port ID intended for MPU use - * @oh: struct omap_hwmod * - * - * Returns the array index of the OCP slave port that the MPU - * addresses the device on, or -EINVAL upon error or not found. - */ -static int __init _find_mpu_port_index(struct omap_hwmod *oh) -{ - int i; - int found = 0; - - if (!oh || oh->slaves_cnt == 0) - return -EINVAL; - - for (i = 0; i < oh->slaves_cnt; i++) { - struct omap_hwmod_ocp_if *os = oh->slaves[i]; - - if (os->user & OCP_USER_MPU) { - found = 1; - break; - } - } - - if (found) - pr_debug("omap_hwmod: %s: MPU OCP slave port ID %d\n", - oh->name, i); - else - pr_debug("omap_hwmod: %s: no MPU OCP slave port found\n", - oh->name); - - return (found) ? i : -EINVAL; -} - -/** - * _find_mpu_rt_base - find hwmod register target base addr accessible by MPU - * @oh: struct omap_hwmod * - * - * Return the virtual address of the base of the register target of - * device @oh, or NULL on error. - */ -static void __iomem * __init _find_mpu_rt_base(struct omap_hwmod *oh, u8 index) -{ - struct omap_hwmod_ocp_if *os; - struct omap_hwmod_addr_space *mem; - int i = 0, found = 0; - void __iomem *va_start; - - if (!oh || oh->slaves_cnt == 0) - return NULL; - - os = oh->slaves[index]; - - if (!os->addr) - return NULL; - - do { - mem = &os->addr[i++]; - if (mem->flags & ADDR_TYPE_RT) - 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; -} - -/** - * _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 - * idle; otherwise, configure it for smart-idle. If module is marked - * as SWSUP_MSUSPEND, force the module out of master standby; - * otherwise, configure it for smart-standby. No return value. - */ -static void _enable_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) { - idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ? - HWMOD_IDLEMODE_NO : HWMOD_IDLEMODE_SMART; - _set_slave_idlemode(oh, idlemode, &v); - } - - if (sf & SYSC_HAS_MIDLEMODE) { - if (oh->flags & HWMOD_SWSUP_MSTANDBY) { - idlemode = HWMOD_IDLEMODE_NO; - } else { - if (sf & SYSC_HAS_ENAWAKEUP) - _enable_wakeup(oh, &v); - if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP) - idlemode = HWMOD_IDLEMODE_SMART_WKUP; - else - idlemode = HWMOD_IDLEMODE_SMART; - } - _set_master_standbymode(oh, idlemode, &v); - } - - /* - * 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, oh->class->sysc->clockact, &v); - - /* If slave is in SMARTIDLE, also enable wakeup */ - if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE)) - _enable_wakeup(oh, &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. - */ -static void _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) { - idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ? - HWMOD_IDLEMODE_FORCE : HWMOD_IDLEMODE_SMART; - _set_slave_idlemode(oh, idlemode, &v); - } - - if (sf & SYSC_HAS_MIDLEMODE) { - if (oh->flags & HWMOD_SWSUP_MSTANDBY) { - idlemode = HWMOD_IDLEMODE_FORCE; - } else { - if (sf & SYSC_HAS_ENAWAKEUP) - _enable_wakeup(oh, &v); - if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP) - idlemode = HWMOD_IDLEMODE_SMART_WKUP; - else - idlemode = HWMOD_IDLEMODE_SMART; - } - _set_master_standbymode(oh, idlemode, &v); - } - - /* If slave is in SMARTIDLE, also enable wakeup */ - if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE)) - _enable_wakeup(oh, &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. - */ -static void _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. - */ -static struct omap_hwmod *_lookup(const char *name) -{ - struct omap_hwmod *oh, *temp_oh; - - oh = NULL; - - list_for_each_entry(temp_oh, &omap_hwmod_list, node) { - if (!strcmp(name, temp_oh->name)) { - oh = temp_oh; - break; - } - } - - return 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 clkdm_name does not exist or if the lookup failed. - */ -static int _init_clkdm(struct omap_hwmod *oh) -{ - if (cpu_is_omap24xx() || cpu_is_omap34xx()) - return 0; - - if (!oh->clkdm_name) { - pr_warning("omap_hwmod: %s: no clkdm_name\n", oh->name); - return -EINVAL; - } - - oh->clkdm = clkdm_lookup(oh->clkdm_name); - if (!oh->clkdm) { - pr_warning("omap_hwmod: %s: could not associate to clkdm %s\n", - oh->name, oh->clkdm_name); - return -EINVAL; - } - - 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 * - * @data: not used; pass NULL - * - * 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. - */ -static int _init_clocks(struct omap_hwmod *oh, void *data) -{ - int ret = 0; - - if (oh->_state != _HWMOD_STATE_REGISTERED) - return 0; - - pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name); - - ret |= _init_main_clk(oh); - ret |= _init_interface_clks(oh); - ret |= _init_opt_clks(oh); - ret |= _init_clkdm(oh); - - if (!ret) - oh->_state = _HWMOD_STATE_CLKS_INITED; - else - pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh->name); - - return ret; -} - -/** - * _wait_target_ready - wait for a module to leave slave idle - * @oh: struct omap_hwmod * - * - * Wait for a module @oh to leave slave idle. Returns 0 if the module - * does not have an IDLEST bit or if the module successfully leaves - * slave idle; otherwise, pass along the return value of the - * appropriate *_cm*_wait_module_ready() function. - */ -static int _wait_target_ready(struct omap_hwmod *oh) -{ - struct omap_hwmod_ocp_if *os; - int ret; - - if (!oh) - return -EINVAL; - - if (oh->_int_flags & _HWMOD_NO_MPU_PORT) - return 0; - - os = oh->slaves[oh->_mpu_port_index]; - - if (oh->flags & HWMOD_NO_IDLEST) - return 0; - - /* XXX check module SIDLEMODE */ - - /* XXX check clock enable states */ - - if (cpu_is_omap24xx() || cpu_is_omap34xx()) { - ret = omap2_cm_wait_module_ready(oh->prcm.omap2.module_offs, - oh->prcm.omap2.idlest_reg_id, - oh->prcm.omap2.idlest_idle_bit); - } else if (cpu_is_omap44xx()) { - if (!oh->clkdm) - return -EINVAL; - - ret = omap4_cminst_wait_module_ready(oh->clkdm->prcm_partition, - oh->clkdm->cm_inst, - oh->clkdm->clkdm_offs, - oh->prcm.omap4.clkctrl_offs); - } else { - BUG(); - }; - - return ret; -} - -/** - * _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. - */ -static u8 _lookup_hardreset(struct omap_hwmod *oh, const char *name, - struct omap_hwmod_rst_info *ohri) -{ - 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)) { - 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. - */ -static int _assert_hardreset(struct omap_hwmod *oh, const char *name) -{ - struct omap_hwmod_rst_info ohri; - u8 ret; - - if (!oh) - return -EINVAL; - - ret = _lookup_hardreset(oh, name, &ohri); - if (IS_ERR_VALUE(ret)) - return ret; - - if (cpu_is_omap24xx() || cpu_is_omap34xx()) - return omap2_prm_assert_hardreset(oh->prcm.omap2.module_offs, - ohri.rst_shift); - else if (cpu_is_omap44xx()) - return omap4_prminst_assert_hardreset(ohri.rst_shift, - oh->clkdm->pwrdm.ptr->prcm_partition, - oh->clkdm->pwrdm.ptr->prcm_offs, - oh->prcm.omap4.rstctrl_offs); - 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) -{ - struct omap_hwmod_rst_info ohri; - int ret; - - if (!oh) - return -EINVAL; - - ret = _lookup_hardreset(oh, name, &ohri); - if (IS_ERR_VALUE(ret)) - return ret; - - if (cpu_is_omap24xx() || cpu_is_omap34xx()) { - ret = omap2_prm_deassert_hardreset(oh->prcm.omap2.module_offs, - ohri.rst_shift, - ohri.st_shift); - } else if (cpu_is_omap44xx()) { - if (ohri.st_shift) - pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n", - oh->name, name); - ret = omap4_prminst_deassert_hardreset(ohri.rst_shift, - oh->clkdm->pwrdm.ptr->prcm_partition, - oh->clkdm->pwrdm.ptr->prcm_offs, - oh->prcm.omap4.rstctrl_offs); - } else { - return -EINVAL; - } - - if (ret == -EBUSY) - pr_warning("omap_hwmod: %s: failed to hardreset\n", oh->name); - - 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. - */ -static int _read_hardreset(struct omap_hwmod *oh, const char *name) -{ - struct omap_hwmod_rst_info ohri; - u8 ret; - - if (!oh) - return -EINVAL; - - ret = _lookup_hardreset(oh, name, &ohri); - if (IS_ERR_VALUE(ret)) - return ret; - - if (cpu_is_omap24xx() || cpu_is_omap34xx()) { - return omap2_prm_is_hardreset_asserted(oh->prcm.omap2.module_offs, - ohri.st_shift); - } else if (cpu_is_omap44xx()) { - return omap4_prminst_is_hardreset_asserted(ohri.rst_shift, - oh->clkdm->pwrdm.ptr->prcm_partition, - oh->clkdm->pwrdm.ptr->prcm_offs, - oh->prcm.omap4.rstctrl_offs); - } else { - return -EINVAL; - } -} - -/** - * _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. - * - * 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. - */ -static int _ocp_softreset(struct omap_hwmod *oh) -{ - u32 v, softrst_mask; - int c = 0; - int ret = 0; - - if (!oh->class->sysc || - !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET)) - return -EINVAL; - - /* clocks must be on for this operation */ - if (oh->_state != _HWMOD_STATE_ENABLED) { - 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 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); - - 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) { - softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift); - omap_test_timeout(!(omap_hwmod_read(oh, - oh->class->sysc->sysc_offs) - & softrst_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: 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() - */ - - 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; -} - -/** - * _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. - */ -static int _reset(struct omap_hwmod *oh) -{ - int ret; - - pr_debug("omap_hwmod: %s: resetting\n", oh->name); - - ret = (oh->class->reset) ? oh->class->reset(oh) : _ocp_softreset(oh); - - if (oh->class->sysc) { - _update_sysc_cache(oh); - _enable_sysc(oh); - } - - return ret; -} - -/** - * _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(). - */ -static int _enable(struct omap_hwmod *oh) -{ - int r; - int hwsup = 0; - - 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. - */ - if (oh->_int_flags & _HWMOD_SKIP_ENABLE) { - /* - * If the caller has mux data populated, do the mux'ing - * which wouldn't have been done as part of the _enable() - * done during setup. - */ - if (oh->mux) - omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED); - - 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 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 ((oh->_state == _HWMOD_STATE_INITIALIZED || - oh->_state == _HWMOD_STATE_DISABLED) && oh->rst_lines_cnt == 1) - _deassert_hardreset(oh, oh->rst_lines[0].name); - - /* Mux pins for device runtime if populated */ - if (oh->mux && (!oh->mux->enabled || - ((oh->_state == _HWMOD_STATE_IDLE) && - oh->mux->pads_dynamic))) - omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED); - - _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. - */ - hwsup = clkdm_in_hwsup(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); - _enable_module(oh); - - r = _wait_target_ready(oh); - if (!r) { - /* - * Set the clockdomain to HW_AUTO only if the target is ready, - * assuming that the previous state was HW_AUTO - */ - if (oh->clkdm && hwsup) - clkdm_allow_idle(oh->clkdm); - - 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 { - _disable_clocks(oh); - pr_debug("omap_hwmod: %s: _wait_target_ready: %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. - */ -static int _idle(struct omap_hwmod *oh) -{ - pr_debug("omap_hwmod: %s: idling\n", oh->name); - - 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); - - _omap4_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_hwmod_disable(oh->clkdm, oh); - - /* Mux pins for device idle if populated */ - if (oh->mux && oh->mux->pads_dynamic) - omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE); - - oh->_state = _HWMOD_STATE_IDLE; - - return 0; -} - -/** - * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit - * @oh: struct omap_hwmod * - * @autoidle: desired AUTOIDLE bitfield value (0 or 1) - * - * Sets the IP block's OCP autoidle bit in hardware, and updates our - * local copy. Intended to be used by drivers that require - * direct manipulation of the AUTOIDLE bits. - * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes - * along the return value from _set_module_autoidle(). - * - * Any users of this function should be scrutinized carefully. - */ -int omap_hwmod_set_ocp_autoidle(struct omap_hwmod *oh, u8 autoidle) -{ - u32 v; - int retval = 0; - unsigned long flags; - - if (!oh || oh->_state != _HWMOD_STATE_ENABLED) - return -EINVAL; - - spin_lock_irqsave(&oh->_lock, flags); - - v = oh->_sysc_cache; - - retval = _set_module_autoidle(oh, autoidle, &v); - - if (!retval) - _write_sysconfig(v, oh); - - spin_unlock_irqrestore(&oh->_lock, flags); - - return retval; -} - -/** - * _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. - */ -static int _shutdown(struct omap_hwmod *oh) -{ - int ret; - u8 prev_state; - - 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; - } - - pr_debug("omap_hwmod: %s: disabling\n", oh->name); - - 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 */ - _omap4_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? */ - - /* - * 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); - - /* Mux pins to safe mode or use populated off mode values */ - if (oh->mux) - omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED); - - oh->_state = _HWMOD_STATE_DISABLED; - - return 0; -} - -/** - * _setup - do initial configuration of omap_hwmod - * @oh: struct omap_hwmod * - * - * Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh - * OCP_SYSCONFIG register. Returns 0. - */ -static int _setup(struct omap_hwmod *oh, void *data) -{ - int i, r; - u8 postsetup_state; - - if (oh->_state != _HWMOD_STATE_CLKS_INITED) - return 0; - - /* 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 (!c) - continue; - - if (os->flags & OCPIF_SWSUP_IDLE) { - /* XXX omap_iclk_deny_idle(c); */ - } else { - /* XXX omap_iclk_allow_idle(c); */ - clk_enable(c); - } - } - } - - oh->_state = _HWMOD_STATE_INITIALIZED; - - /* - * 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 = _enable(oh); - if (r) { - pr_warning("omap_hwmod: %s: cannot be enabled (%d)\n", - oh->name, oh->_state); - return 0; - } - - if (!(oh->flags & HWMOD_INIT_NO_RESET)) - _reset(oh); - - postsetup_state = oh->_postsetup_state; - if (postsetup_state == _HWMOD_STATE_UNKNOWN) - postsetup_state = _HWMOD_STATE_ENABLED; - - /* - * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data - - * it should be set by the core code as a runtime flag during startup - */ - if ((oh->flags & HWMOD_INIT_NO_IDLE) && - (postsetup_state == _HWMOD_STATE_IDLE)) { - oh->_int_flags |= _HWMOD_SKIP_ENABLE; - postsetup_state = _HWMOD_STATE_ENABLED; - } - - if (postsetup_state == _HWMOD_STATE_IDLE) - _idle(oh); - else if (postsetup_state == _HWMOD_STATE_DISABLED) - _shutdown(oh); - else if (postsetup_state != _HWMOD_STATE_ENABLED) - WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n", - oh->name, postsetup_state); - - return 0; -} - -/** - * _register - register a struct omap_hwmod - * @oh: struct omap_hwmod * - * - * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod - * already has been registered by the same name; -EINVAL if the - * omap_hwmod is in the wrong state, if @oh is NULL, if the - * omap_hwmod's class field is NULL; if the omap_hwmod is missing a - * name, or if the omap_hwmod's class is missing a name; or 0 upon - * success. - * - * XXX The data should be copied into bootmem, so the original data - * should be marked __initdata and freed after init. This would allow - * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note - * that the copy process would be relatively complex due to the large number - * of substructures. - */ -static int __init _register(struct omap_hwmod *oh) -{ - int ms_id; - - if (!oh || !oh->name || !oh->class || !oh->class->name || - (oh->_state != _HWMOD_STATE_UNKNOWN)) - return -EINVAL; - - pr_debug("omap_hwmod: %s: registering\n", oh->name); - - if (_lookup(oh->name)) - return -EEXIST; - - ms_id = _find_mpu_port_index(oh); - if (!IS_ERR_VALUE(ms_id)) - oh->_mpu_port_index = ms_id; - else - oh->_int_flags |= _HWMOD_NO_MPU_PORT; - - list_add_tail(&oh->node, &omap_hwmod_list); - - spin_lock_init(&oh->_lock); - - oh->_state = _HWMOD_STATE_REGISTERED; - - /* - * XXX Rather than doing a strcmp(), this should test a flag - * set in the hwmod data, inserted by the autogenerator code. - */ - if (!strcmp(oh->name, MPU_INITIATOR_NAME)) - mpu_oh = oh; - - return 0; -} - - -/* Public functions */ - -u32 omap_hwmod_read(struct omap_hwmod *oh, u16 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_write(u32 v, struct omap_hwmod *oh, u16 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_softreset - reset a module via SYSCONFIG.SOFTRESET bit - * @oh: struct omap_hwmod * - * - * This is a public function exposed to drivers. Some drivers may need to do - * some settings before and after resetting the device. Those drivers after - * doing the necessary settings could use this function to start a reset by - * setting the SYSCONFIG.SOFTRESET bit. - */ -int omap_hwmod_softreset(struct omap_hwmod *oh) -{ - u32 v; - int ret; - - if (!oh || !(oh->_sysc_cache)) - return -EINVAL; - - v = oh->_sysc_cache; - ret = _set_softreset(oh, &v); - if (ret) - goto error; - _write_sysconfig(v, oh); - -error: - return ret; -} - -/** - * 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; - int retval = 0; - - if (!oh) - return -EINVAL; - - v = oh->_sysc_cache; - - retval = _set_slave_idlemode(oh, idlemode, &v); - if (!retval) - _write_sysconfig(v, oh); - - return retval; -} - -/** - * omap_hwmod_lookup - look up a registered omap_hwmod by name - * @name: name of the omap_hwmod to look up - * - * Given a @name of an omap_hwmod, return a pointer to the registered - * struct omap_hwmod *, or NULL upon error. - */ -struct omap_hwmod *omap_hwmod_lookup(const char *name) -{ - struct omap_hwmod *oh; - - if (!name) - return NULL; - - oh = _lookup(name); - - return oh; -} - -/** - * 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 - * failure. If @fn returns non-zero, the iteration across omap_hwmods - * will stop and the non-zero return value will be passed to the - * 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, void *data), - void *data) -{ - struct omap_hwmod *temp_oh; - int ret = 0; - - if (!fn) - return -EINVAL; - - list_for_each_entry(temp_oh, &omap_hwmod_list, node) { - ret = (*fn)(temp_oh, data); - if (ret) - break; - } - - return ret; -} - -/** - * omap_hwmod_register - register an array of hwmods - * @ohs: pointer to an array of omap_hwmods to register - * - * Intended to be called early in boot before the clock framework is - * initialized. If @ohs is not null, will register all omap_hwmods - * listed in @ohs that are valid for this chip. Returns 0. - */ -int __init omap_hwmod_register(struct omap_hwmod **ohs) -{ - int r, i; - - if (!ohs) - return 0; - - i = 0; - do { - r = _register(ohs[i]); - WARN(r, "omap_hwmod: %s: _register returned %d\n", ohs[i]->name, - r); - } while (ohs[++i]); - - return 0; -} - -/* - * _populate_mpu_rt_base - populate the virtual address for a hwmod - * - * Must be called only from omap_hwmod_setup_*() so ioremap works properly. - * Assumes the caller takes care of locking if needed. - */ -static int __init _populate_mpu_rt_base(struct omap_hwmod *oh, void *data) -{ - 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; -} - -/** - * 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. - */ -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; - } - - _setup(oh, NULL); - - return 0; -} - -/** - * omap_hwmod_setup - do some post-clock framework initialization - * - * 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__); - - omap_hwmod_for_each(_setup, NULL); - - return 0; -} -core_initcall(omap_hwmod_setup_all); - -/** - * omap_hwmod_enable - enable an omap_hwmod - * @oh: struct omap_hwmod * - * - * 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) -{ - int r; - unsigned long flags; - - if (!oh) - return -EINVAL; - - spin_lock_irqsave(&oh->_lock, flags); - r = _enable(oh); - spin_unlock_irqrestore(&oh->_lock, flags); - - return r; -} - -/** - * omap_hwmod_idle - idle an omap_hwmod - * @oh: struct omap_hwmod * - * - * 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) -{ - unsigned long flags; - - if (!oh) - return -EINVAL; - - spin_lock_irqsave(&oh->_lock, flags); - _idle(oh); - spin_unlock_irqrestore(&oh->_lock, flags); - - return 0; -} - -/** - * omap_hwmod_shutdown - shutdown an omap_hwmod - * @oh: struct omap_hwmod * - * - * 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(). - */ -int omap_hwmod_shutdown(struct omap_hwmod *oh) -{ - unsigned long flags; - - if (!oh) - return -EINVAL; - - spin_lock_irqsave(&oh->_lock, flags); - _shutdown(oh); - spin_unlock_irqrestore(&oh->_lock, flags); - - return 0; -} - -/** - * omap_hwmod_enable_clocks - enable main_clk, all interface clocks - * @oh: struct omap_hwmod *oh - * - * Intended to be called by the omap_device code. - */ -int omap_hwmod_enable_clocks(struct omap_hwmod *oh) -{ - unsigned long flags; - - spin_lock_irqsave(&oh->_lock, flags); - _enable_clocks(oh); - spin_unlock_irqrestore(&oh->_lock, flags); - - return 0; -} - -/** - * omap_hwmod_disable_clocks - disable main_clk, all interface clocks - * @oh: struct omap_hwmod *oh - * - * Intended to be called by the omap_device code. - */ -int omap_hwmod_disable_clocks(struct omap_hwmod *oh) -{ - unsigned long flags; - - spin_lock_irqsave(&oh->_lock, flags); - _disable_clocks(oh); - spin_unlock_irqrestore(&oh->_lock, flags); - - return 0; -} - -/** - * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete - * @oh: struct omap_hwmod *oh - * - * Intended to be called by drivers and core code when all posted - * writes to a device must complete before continuing further - * execution (for example, after clearing some device IRQSTATUS - * register bits) - * - * XXX what about targets with multiple OCP threads? - */ -void omap_hwmod_ocp_barrier(struct omap_hwmod *oh) -{ - BUG_ON(!oh); - - if (!oh->class->sysc || !oh->class->sysc->sysc_flags) { - WARN(1, "omap_device: %s: OCP barrier impossible due to device configuration\n", - oh->name); - return; - } - - /* - * Forces posted writes to complete on the OCP thread handling - * register writes - */ - omap_hwmod_read(oh, oh->class->sysc->sysc_offs); -} - -/** - * omap_hwmod_reset - reset the hwmod - * @oh: struct omap_hwmod * - * - * 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(). - */ -int omap_hwmod_reset(struct omap_hwmod *oh) -{ - int r; - unsigned long flags; - - if (!oh) - return -EINVAL; - - spin_lock_irqsave(&oh->_lock, flags); - r = _reset(oh); - spin_unlock_irqrestore(&oh->_lock, flags); - - return r; -} - -/** - * omap_hwmod_count_resources - count number of struct resources needed by hwmod - * @oh: struct omap_hwmod * - * @res: pointer to the first element of an array of struct resource to fill - * - * Count the number of struct resource array elements necessary to - * contain omap_hwmod @oh resources. Intended to be called by code - * that registers omap_devices. Intended to be used to determine the - * size of a dynamically-allocated struct resource array, before - * calling omap_hwmod_fill_resources(). Returns the number of struct - * resource array elements needed. - * - * XXX This code is not optimized. It could attempt to merge adjacent - * resource IDs. - * - */ -int omap_hwmod_count_resources(struct omap_hwmod *oh) -{ - int ret, i; - - ret = _count_mpu_irqs(oh) + _count_sdma_reqs(oh); - - for (i = 0; i < oh->slaves_cnt; i++) - ret += _count_ocp_if_addr_spaces(oh->slaves[i]); - - return ret; -} - -/** - * omap_hwmod_fill_resources - fill struct resource array with hwmod data - * @oh: struct omap_hwmod * - * @res: pointer to the first element of an array of struct resource to fill - * - * Fill the struct resource array @res with resource data from the - * omap_hwmod @oh. Intended to be called by code that registers - * omap_devices. See also omap_hwmod_count_resources(). Returns the - * number of array elements filled. - */ -int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res) -{ - int i, j, mpu_irqs_cnt, sdma_reqs_cnt; - int r = 0; - - /* For each IRQ, DMA, memory area, fill in array.*/ - - mpu_irqs_cnt = _count_mpu_irqs(oh); - for (i = 0; i < mpu_irqs_cnt; i++) { - (res + r)->name = (oh->mpu_irqs + i)->name; - (res + r)->start = (oh->mpu_irqs + i)->irq; - (res + r)->end = (oh->mpu_irqs + i)->irq; - (res + r)->flags = IORESOURCE_IRQ; - r++; - } - - sdma_reqs_cnt = _count_sdma_reqs(oh); - for (i = 0; i < 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++; - } - - for (i = 0; i < oh->slaves_cnt; i++) { - struct omap_hwmod_ocp_if *os; - int addr_cnt; - - os = oh->slaves[i]; - addr_cnt = _count_ocp_if_addr_spaces(os); - - for (j = 0; j < addr_cnt; j++) { - (res + r)->name = (os->addr + j)->name; - (res + r)->start = (os->addr + j)->pa_start; - (res + r)->end = (os->addr + j)->pa_end; - (res + r)->flags = IORESOURCE_MEM; - r++; - } - } - - return r; -} - -/** - * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain - * @oh: struct omap_hwmod * - * - * Return the powerdomain pointer associated with the OMAP module - * @oh's main clock. If @oh does not have a main clk, return the - * powerdomain associated with the interface clock associated with the - * module's MPU port. (XXX Perhaps this should use the SDMA port - * instead?) Returns NULL on error, or a struct powerdomain * on - * success. - */ -struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh) -{ - struct clk *c; - - if (!oh) - return NULL; - - if (oh->_clk) { - c = oh->_clk; - } else { - if (oh->_int_flags & _HWMOD_NO_MPU_PORT) - return NULL; - c = oh->slaves[oh->_mpu_port_index]->_clk; - } - - if (!c->clkdm) - return NULL; - - return c->clkdm->pwrdm.ptr; - -} - -/** - * 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 * - * @init_oh: struct omap_hwmod * (initiator) - * - * Add a sleep dependency between the initiator @init_oh and @oh. - * Intended to be called by DSP/Bridge code via platform_data for the - * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge - * code needs to add/del initiator dependencies dynamically - * before/after accessing a device. Returns the return value from - * _add_initiator_dep(). - * - * XXX Keep a usecount in the clockdomain code - */ -int omap_hwmod_add_initiator_dep(struct omap_hwmod *oh, - struct omap_hwmod *init_oh) -{ - return _add_initiator_dep(oh, init_oh); -} - -/* - * XXX what about functions for drivers to save/restore ocp_sysconfig - * for context save/restore operations? - */ - -/** - * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh - * @oh: struct omap_hwmod * - * @init_oh: struct omap_hwmod * (initiator) - * - * Remove a sleep dependency between the initiator @init_oh and @oh. - * Intended to be called by DSP/Bridge code via platform_data for the - * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge - * code needs to add/del initiator dependencies dynamically - * before/after accessing a device. Returns the return value from - * _del_initiator_dep(). - * - * XXX Keep a usecount in the clockdomain code - */ -int omap_hwmod_del_initiator_dep(struct omap_hwmod *oh, - struct omap_hwmod *init_oh) -{ - return _del_initiator_dep(oh, init_oh); -} - -/** - * omap_hwmod_enable_wakeup - allow device to wake up the system - * @oh: struct omap_hwmod * - * - * Sets the module OCP socket ENAWAKEUP bit to allow the module to - * 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; - - spin_lock_irqsave(&oh->_lock, flags); - - 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); - - return 0; -} - -/** - * omap_hwmod_disable_wakeup - prevent device from waking the system - * @oh: struct omap_hwmod * - * - * Clears the module OCP socket ENAWAKEUP bit to prevent the module - * 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; - - spin_lock_irqsave(&oh->_lock, flags); - - 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); - - 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; - unsigned long flags; - - if (!oh) - return -EINVAL; - - spin_lock_irqsave(&oh->_lock, flags); - ret = _assert_hardreset(oh, name); - spin_unlock_irqrestore(&oh->_lock, flags); - - 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; - unsigned long flags; - - if (!oh) - return -EINVAL; - - spin_lock_irqsave(&oh->_lock, flags); - ret = _deassert_hardreset(oh, name); - spin_unlock_irqrestore(&oh->_lock, flags); - - 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; - unsigned long flags; - - if (!oh) - return -EINVAL; - - spin_lock_irqsave(&oh->_lock, flags); - ret = _read_hardreset(oh, name); - spin_unlock_irqrestore(&oh->_lock, flags); - - 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 - * @fn: callback function pointer to call for each hwmod in class @classname - * @user: arbitrary context data to pass to the callback function - * - * For each omap_hwmod of class @classname, call @fn. - * If the callback function returns something other than - * zero, the iterator is terminated, and the callback function's return - * value is passed back to the caller. Returns 0 upon success, -EINVAL - * if @classname or @fn are NULL, or passes back the error code from @fn. - */ -int omap_hwmod_for_each_by_class(const char *classname, - int (*fn)(struct omap_hwmod *oh, - void *user), - void *user) -{ - struct omap_hwmod *temp_oh; - int ret = 0; - - if (!classname || !fn) - return -EINVAL; - - pr_debug("omap_hwmod: %s: looking for modules of class %s\n", - __func__, classname); - - list_for_each_entry(temp_oh, &omap_hwmod_list, node) { - if (!strcmp(temp_oh->class->name, classname)) { - pr_debug("omap_hwmod: %s: %s: calling callback fn\n", - __func__, temp_oh->name); - ret = (*fn)(temp_oh, user); - if (ret) - break; - } - } - - if (ret) - pr_debug("omap_hwmod: %s: iterator terminated early: %d\n", - __func__, ret); - - return ret; -} - -/** - * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod - * @oh: struct omap_hwmod * - * @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. - */ -int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state) -{ - int ret; - unsigned long flags; - - if (!oh) - return -EINVAL; - - if (state != _HWMOD_STATE_DISABLED && - state != _HWMOD_STATE_ENABLED && - state != _HWMOD_STATE_IDLE) - return -EINVAL; - - spin_lock_irqsave(&oh->_lock, flags); - - if (oh->_state != _HWMOD_STATE_REGISTERED) { - ret = -EINVAL; - goto ohsps_unlock; - } - - oh->_postsetup_state = state; - ret = 0; - -ohsps_unlock: - spin_unlock_irqrestore(&oh->_lock, flags); - - return ret; -} - -/** - * omap_hwmod_get_context_loss_count - get lost context count - * @oh: struct omap_hwmod * - * - * Query the powerdomain of of @oh to get the context loss - * count for this device. - * - * Returns the context loss count of the powerdomain assocated with @oh - * upon success, or zero if no powerdomain exists for @oh. - */ -int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh) -{ - struct powerdomain *pwrdm; - int ret = 0; - - pwrdm = omap_hwmod_get_pwrdm(oh); - if (pwrdm) - ret = pwrdm_get_context_loss_count(pwrdm); - - return ret; -} - -/** - * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup - * @oh: struct omap_hwmod * - * - * Prevent the hwmod @oh from being reset during the setup process. - * Intended for use by board-*.c files on boards with devices that - * cannot tolerate being reset. Must be called before the hwmod has - * been set up. Returns 0 upon success or negative error code upon - * failure. - */ -int omap_hwmod_no_setup_reset(struct omap_hwmod *oh) -{ - if (!oh) - return -EINVAL; - - if (oh->_state != _HWMOD_STATE_REGISTERED) { - pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n", - oh->name); - return -EINVAL; - } - - oh->flags |= HWMOD_INIT_NO_RESET; - - return 0; -} - -/** - * omap_hwmod_pad_route_irq - route an I/O pad wakeup to a particular MPU IRQ - * @oh: struct omap_hwmod * containing hwmod mux entries - * @pad_idx: array index in oh->mux of the hwmod mux entry to route wakeup - * @irq_idx: the hwmod mpu_irqs array index of the IRQ to trigger on wakeup - * - * When an I/O pad wakeup arrives for the dynamic or wakeup hwmod mux - * entry number @pad_idx for the hwmod @oh, trigger the interrupt - * service routine for the hwmod's mpu_irqs array index @irq_idx. If - * this function is not called for a given pad_idx, then the ISR - * associated with @oh's first MPU IRQ will be triggered when an I/O - * pad wakeup occurs on that pad. Note that @pad_idx is the index of - * the _dynamic or wakeup_ entry: if there are other entries not - * marked with OMAP_DEVICE_PAD_WAKEUP or OMAP_DEVICE_PAD_REMUX, these - * entries are NOT COUNTED in the dynamic pad index. This function - * must be called separately for each pad that requires its interrupt - * to be re-routed this way. Returns -EINVAL if there is an argument - * problem or if @oh does not have hwmod mux entries or MPU IRQs; - * returns -ENOMEM if memory cannot be allocated; or 0 upon success. - * - * XXX This function interface is fragile. Rather than using array - * indexes, which are subject to unpredictable change, it should be - * using hwmod IRQ names, and some other stable key for the hwmod mux - * pad records. - */ -int omap_hwmod_pad_route_irq(struct omap_hwmod *oh, int pad_idx, int irq_idx) -{ - int nr_irqs; - - might_sleep(); - - if (!oh || !oh->mux || !oh->mpu_irqs || pad_idx < 0 || - pad_idx >= oh->mux->nr_pads_dynamic) - return -EINVAL; - - /* Check the number of available mpu_irqs */ - for (nr_irqs = 0; oh->mpu_irqs[nr_irqs].irq >= 0; nr_irqs++) - ; - - if (irq_idx >= nr_irqs) - return -EINVAL; - - if (!oh->mux->irqs) { - /* XXX What frees this? */ - oh->mux->irqs = kzalloc(sizeof(int) * oh->mux->nr_pads_dynamic, - GFP_KERNEL); - if (!oh->mux->irqs) - return -ENOMEM; - } - oh->mux->irqs[pad_idx] = irq_idx; - - return 0; -} |