/* * omap_hwmod implementation for OMAP2/3/4 * * Copyright (C) 2009-2010 Nokia Corporation * * 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: * - pin mux handling * - 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "cm.h" #include "prm.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); static DEFINE_MUTEX(omap_hwmod_mutex); /* mpu_oh: used to add/remove MPU initiator from sleepdep list */ static struct omap_hwmod *mpu_oh; /* inited: 0 if omap_hwmod_init() has not yet been called; 1 otherwise */ static u8 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. */ 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 = (0x3 << autoidle_shift); *v &= ~autoidle_mask; *v |= autoidle << autoidle_shift; return 0; } /** * _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, wakeup_mask; if (!oh->class->sysc || !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) 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; } wakeup_mask = (0x1 << oh->class->sysc->sysc_fields->enwkup_shift); v = oh->_sysc_cache; v |= wakeup_mask; _write_sysconfig(v, oh); /* 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, wakeup_mask; if (!oh->class->sysc || !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) 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; } wakeup_mask = (0x1 << oh->class->sysc->sysc_fields->enwkup_shift); v = oh->_sysc_cache; v &= ~wakeup_mask; _write_sysconfig(v, oh); /* 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. 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; 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. 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; 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); } } /** * _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 _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 *_find_mpu_rt_base(struct omap_hwmod *oh, u8 index) { struct omap_hwmod_ocp_if *os; struct omap_hwmod_addr_space *mem; int i; int found = 0; void __iomem *va_start; if (!oh || oh->slaves_cnt == 0) return NULL; os = oh->slaves[index]; for (i = 0, mem = os->addr; i < os->addr_cnt; i++, mem++) { if (mem->flags & ADDR_TYPE_RT) { found = 1; break; } } 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) { idlemode = (oh->flags & HWMOD_SWSUP_MSTANDBY) ? HWMOD_IDLEMODE_NO : 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); _write_sysconfig(v, oh); /* If slave is in SMARTIDLE, also enable wakeup */ if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE)) _enable_wakeup(oh); /* * Set the autoidle bit only after setting the smartidle bit * Setting this will not have any impact on the other modules. */ if (sf & SYSC_HAS_AUTOIDLE) { idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ? 0 : 1; _set_module_autoidle(oh, idlemode, &v); _write_sysconfig(v, oh); } } /** * _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) { idlemode = (oh->flags & HWMOD_SWSUP_MSTANDBY) ? HWMOD_IDLEMODE_FORCE : HWMOD_IDLEMODE_SMART; _set_master_standbymode(oh, idlemode, &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. * Caller must hold omap_hwmod_mutex. */ 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_clocks - clk_get() all clocks associated with this hwmod * @oh: struct omap_hwmod * * @data: not used; pass NULL * * Called by omap_hwmod_late_init() (after omap2_clk_init()). * Resolves all clock names embedded in the hwmod. Returns -EINVAL if * the omap_hwmod has not yet been registered or if the clocks have * already been initialized, 0 on success, or a non-zero error on * failure. */ static int _init_clocks(struct omap_hwmod *oh, void *data) { int ret = 0; if (!oh || (oh->_state != _HWMOD_STATE_REGISTERED)) return -EINVAL; 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); if (!ret) oh->_state = _HWMOD_STATE_CLKS_INITED; return 0; } /** * _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()) { ret = omap4_cm_wait_module_ready(oh->prcm.omap4.clkctrl_reg); } else { BUG(); }; return ret; } /** * _lookup_hardreset - return the register bit shift for this hwmod/reset line * @oh: struct omap_hwmod * * @name: name of the reset line in the context of this hwmod * * Return the bit position of the reset line that match the * input name. Return -ENOENT if not found. */ static u8 _lookup_hardreset(struct omap_hwmod *oh, const char *name) { int i; for (i = 0; i < oh->rst_lines_cnt; i++) { const char *rst_line = oh->rst_lines[i].name; if (!strcmp(rst_line, name)) { u8 shift = oh->rst_lines[i].rst_shift; pr_debug("omap_hwmod: %s: _lookup_hardreset: %s: %d\n", oh->name, rst_line, shift); return shift; } } return -ENOENT; } /** * _assert_hardreset - assert the HW reset line of submodules * contained in the hwmod module. * @oh: struct omap_hwmod * * @name: name of the reset line to lookup and assert * * Some IP like dsp, ipu or iva contain processor that require * an HW reset line to be assert / deassert in order to enable fully * the IP. */ static int _assert_hardreset(struct omap_hwmod *oh, const char *name) { u8 shift; if (!oh) return -EINVAL; shift = _lookup_hardreset(oh, name); if (IS_ERR_VALUE(shift)) return shift; if (cpu_is_omap24xx() || cpu_is_omap34xx()) return omap2_prm_assert_hardreset(oh->prcm.omap2.module_offs, shift); else if (cpu_is_omap44xx()) return omap4_prm_assert_hardreset(oh->prcm.omap4.rstctrl_reg, shift); else return -EINVAL; } /** * _deassert_hardreset - deassert the HW reset line of submodules contained * in the hwmod module. * @oh: struct omap_hwmod * * @name: name of the reset line to look up and deassert * * Some IP like dsp, ipu or iva contain processor that require * an HW reset line to be assert / deassert in order to enable fully * the IP. */ static int _deassert_hardreset(struct omap_hwmod *oh, const char *name) { u8 shift; int r; if (!oh) return -EINVAL; shift = _lookup_hardreset(oh, name); if (IS_ERR_VALUE(shift)) return shift; if (cpu_is_omap24xx() || cpu_is_omap34xx()) r = omap2_prm_deassert_hardreset(oh->prcm.omap2.module_offs, shift); else if (cpu_is_omap44xx()) r = omap4_prm_deassert_hardreset(oh->prcm.omap4.rstctrl_reg, shift); else return -EINVAL; if (r == -EBUSY) pr_warning("omap_hwmod: %s: failed to hardreset\n", oh->name); return r; } /** * _read_hardreset - read the HW reset line state of submodules * contained in the hwmod module * @oh: struct omap_hwmod * * @name: name of the reset line to look up and read * * Return the state of the reset line. */ static int _read_hardreset(struct omap_hwmod *oh, const char *name) { u8 shift; if (!oh) return -EINVAL; shift = _lookup_hardreset(oh, name); if (IS_ERR_VALUE(shift)) return shift; if (cpu_is_omap24xx() || cpu_is_omap34xx()) { return omap2_prm_is_hardreset_asserted(oh->prcm.omap2.module_offs, shift); } else if (cpu_is_omap44xx()) { return omap4_prm_is_hardreset_asserted(oh->prcm.omap4.rstctrl_reg, shift); } else { return -EINVAL; } } /** * _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; 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->sysc_flags & SYSS_HAS_RESET_STATUS) omap_test_timeout((omap_hwmod_read(oh, oh->class->sysc->syss_offs) & SYSS_RESETDONE_MASK), MAX_MODULE_SOFTRESET_WAIT, c); else if (oh->class->sysc->sysc_flags & SYSC_HAS_RESET_STATUS) omap_test_timeout(!(omap_hwmod_read(oh, oh->class->sysc->sysc_offs) & SYSC_TYPE2_SOFTRESET_MASK), MAX_MODULE_SOFTRESET_WAIT, c); if (c == MAX_MODULE_SOFTRESET_WAIT) pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n", oh->name, MAX_MODULE_SOFTRESET_WAIT); else pr_debug("omap_hwmod: %s: 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); 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; 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; } pr_debug("omap_hwmod: %s: enabling\n", oh->name); /* * If an IP contains only one HW reset line, then de-assert it in order * to allow to enable the clocks. Otherwise the PRCM will return * Intransition status, and the init will failed. */ if ((oh->_state == _HWMOD_STATE_INITIALIZED || oh->_state == _HWMOD_STATE_DISABLED) && oh->rst_lines_cnt == 1) _deassert_hardreset(oh, oh->rst_lines[0].name); /* XXX mux balls */ _add_initiator_dep(oh, mpu_oh); _enable_clocks(oh); r = _wait_target_ready(oh); 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 { pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n", oh->name, r); } 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) { 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; } pr_debug("omap_hwmod: %s: idling\n", oh->name); if (oh->class->sysc) _idle_sysc(oh); _del_initiator_dep(oh, mpu_oh); _disable_clocks(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. */ 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) _shutdown_sysc(oh); /* * If an IP contains only one HW reset line, then assert it * before disabling the clocks and shutting down the IP. */ if (oh->rst_lines_cnt == 1) _assert_hardreset(oh, oh->rst_lines[0].name); /* clocks and deps are already disabled in idle */ if (oh->_state == _HWMOD_STATE_ENABLED) { _del_initiator_dep(oh, mpu_oh); /* XXX what about the other system initiators here? dma, dsp */ _disable_clocks(oh); } /* XXX Should this code also force-disable the optional clocks? */ /* XXX mux any associated balls to safe mode */ 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 -EINVAL if the hwmod is in the * wrong state or returns 0. */ static int _setup(struct omap_hwmod *oh, void *data) { int i, r; u8 postsetup_state; /* 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); /* * 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); } } 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)) 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; } /* 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_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_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. */ int omap_hwmod_register(struct omap_hwmod *oh) { int ret, ms_id; if (!oh || !oh->name || !oh->class || !oh->class->name || (oh->_state != _HWMOD_STATE_UNKNOWN)) return -EINVAL; mutex_lock(&omap_hwmod_mutex); pr_debug("omap_hwmod: %s: registering\n", oh->name); if (_lookup(oh->name)) { ret = -EEXIST; goto ohr_unlock; } ms_id = _find_mpu_port_index(oh); if (!IS_ERR_VALUE(ms_id)) { oh->_mpu_port_index = ms_id; oh->_mpu_rt_va = _find_mpu_rt_base(oh, oh->_mpu_port_index); } 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; ret = 0; ohr_unlock: mutex_unlock(&omap_hwmod_mutex); return ret; } /** * 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; mutex_lock(&omap_hwmod_mutex); oh = _lookup(name); mutex_unlock(&omap_hwmod_mutex); 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; if (!fn) return -EINVAL; mutex_lock(&omap_hwmod_mutex); list_for_each_entry(temp_oh, &omap_hwmod_list, node) { ret = (*fn)(temp_oh, data); if (ret) break; } mutex_unlock(&omap_hwmod_mutex); return ret; } /** * omap_hwmod_init - init omap_hwmod code and register 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 -EINVAL if * omap_hwmod_init() has already been called or 0 otherwise. */ int omap_hwmod_init(struct omap_hwmod **ohs) { struct omap_hwmod *oh; int r; if (inited) return -EINVAL; inited = 1; if (!ohs) return 0; oh = *ohs; while (oh) { if (omap_chip_is(oh->omap_chip)) { r = omap_hwmod_register(oh); WARN(r, "omap_hwmod: %s: omap_hwmod_register returned " "%d\n", oh->name, r); } oh = *++ohs; } return 0; } /** * omap_hwmod_late_init - 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. */ int omap_hwmod_late_init(void) { int r; /* XXX check return value */ r = omap_hwmod_for_each(_init_clocks, NULL); WARN(r, "omap_hwmod: omap_hwmod_late_init(): _init_clocks failed\n"); mpu_oh = omap_hwmod_lookup(MPU_INITIATOR_NAME); WARN(!mpu_oh, "omap_hwmod: could not find MPU initiator hwmod %s\n", MPU_INITIATOR_NAME); omap_hwmod_for_each(_setup, NULL); return 0; } /** * omap_hwmod_unregister - unregister an omap_hwmod * @oh: struct omap_hwmod * * * Unregisters a previously-registered omap_hwmod @oh. There's probably * no use case for this, so it is likely to be removed in a later version. * * XXX Free all of the bootmem-allocated structures here when that is * implemented. Make it clear that core code is the only code that is * expected to unregister modules. */ int omap_hwmod_unregister(struct omap_hwmod *oh) { if (!oh) return -EINVAL; pr_debug("omap_hwmod: %s: unregistering\n", oh->name); mutex_lock(&omap_hwmod_mutex); iounmap(oh->_mpu_rt_va); list_del(&oh->node); mutex_unlock(&omap_hwmod_mutex); return 0; } /** * 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 = oh->mpu_irqs_cnt + oh->sdma_reqs_cnt; for (i = 0; i < oh->slaves_cnt; i++) ret += oh->slaves[i]->addr_cnt; 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; int r = 0; /* For each IRQ, DMA, memory area, fill in array.*/ for (i = 0; i < oh->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++; } for (i = 0; i < oh->sdma_reqs_cnt; i++) { (res + r)->name = (oh->sdma_reqs + i)->name; (res + r)->start = (oh->sdma_reqs + i)->dma_req; (res + r)->end = (oh->sdma_reqs + i)->dma_req; (res + r)->flags = IORESOURCE_DMA; r++; } for (i = 0; i < oh->slaves_cnt; i++) { struct omap_hwmod_ocp_if *os; os = oh->slaves[i]; for (j = 0; j < os->addr_cnt; j++) { (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. Eventually this should sets PRCM wakeup * registers to cause the PRCM to receive wakeup events from the * module. Does not set any wakeup routing registers beyond this * point - if the module is to wake up any other module or subsystem, * that must be set separately. Called by omap_device code. Returns * -EINVAL on error or 0 upon success. */ int omap_hwmod_enable_wakeup(struct omap_hwmod *oh) { unsigned long flags; if (!oh->class->sysc || !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) return -EINVAL; spin_lock_irqsave(&oh->_lock, flags); _enable_wakeup(oh); 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. 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; if (!oh->class->sysc || !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) return -EINVAL; spin_lock_irqsave(&oh->_lock, flags); _disable_wakeup(oh); 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. Takes * omap_hwmod_mutex to prevent the hwmod list from changing during the * iteration. 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); mutex_lock(&omap_hwmod_mutex); 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; } } mutex_unlock(&omap_hwmod_mutex); 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_late_init()). Only valid to call between calls to * omap_hwmod_init() and omap_hwmod_late_init(). 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; }