| /* |
| * omap_hwmod implementation for OMAP2/3/4 |
| * |
| * Copyright (C) 2009-2010 Nokia Corporation |
| * |
| * Paul Walmsley, BenoƮt 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. |
| * |
| * This code manages "OMAP modules" (on-chip devices) and their |
| * integration with Linux device driver and bus code. |
| * |
| * References: |
| * - 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 <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 <plat/common.h> |
| #include <plat/cpu.h> |
| #include <plat/clockdomain.h> |
| #include <plat/powerdomain.h> |
| #include <plat/clock.h> |
| #include <plat/omap_hwmod.h> |
| #include <plat/prcm.h> |
| |
| #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_readl(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 */ |
| |
| if (oh->_sysc_cache != v) { |
| oh->_sysc_cache = v; |
| omap_hwmod_writel(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; |
| } |
| |
| /** |
| * _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; |
| } |
| |
| /** |
| * _sysc_enable - 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 _sysc_enable(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); |
| } |
| |
| if (sf & SYSC_HAS_AUTOIDLE) { |
| idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ? |
| 0 : 1; |
| _set_module_autoidle(oh, idlemode, &v); |
| } |
| |
| /* XXX OCP ENAWAKEUP bit? */ |
| |
| /* |
| * 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); |
| } |
| |
| /** |
| * _sysc_idle - 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 _sysc_idle(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); |
| } |
| |
| /** |
| * _sysc_shutdown - 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 _sysc_shutdown(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; |
| } |
| } |
| |
| /** |
| * _reset - reset an omap_hwmod |
| * @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 does not have SYSSTATUS register and instead |
| * use the SYSCONFIG softreset bit to provide the status. |
| * |
| * Note that some IP like McBSP does have a reset control but no reset status. |
| */ |
| static int _reset(struct omap_hwmod *oh) |
| { |
| u32 r, v; |
| int c = 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; |
| } |
| |
| pr_debug("omap_hwmod: %s: resetting\n", oh->name); |
| |
| v = oh->_sysc_cache; |
| r = _set_softreset(oh, &v); |
| if (r) |
| return r; |
| _write_sysconfig(v, oh); |
| |
| if (oh->class->sysc->sysc_flags & SYSS_HAS_RESET_STATUS) |
| omap_test_timeout((omap_hwmod_readl(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_readl(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() |
| */ |
| |
| return (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0; |
| } |
| |
| /** |
| * _omap_hwmod_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(). |
| */ |
| int _omap_hwmod_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); |
| _sysc_enable(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. |
| */ |
| int _omap_hwmod_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) |
| _sysc_idle(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) |
| { |
| 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->sysc) |
| _sysc_shutdown(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 * |
| * @skip_setup_idle_p: do not idle hwmods at the end of the fn if 1 |
| * |
| * Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh |
| * OCP_SYSCONFIG register. @skip_setup_idle is intended to be used on |
| * a system that will not call omap_hwmod_enable() to enable devices |
| * (e.g., a system without PM runtime). 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 skip_setup_idle; |
| |
| if (!oh || !data) |
| return -EINVAL; |
| |
| skip_setup_idle = *(u8 *)data; |
| |
| /* 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); |
| } |
| } |
| } |
| |
| mutex_init(&oh->_mutex); |
| 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 = _omap_hwmod_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 _omap_hwmod_enable() function should be split to |
| * avoid the rewrite of the OCP_SYSCONFIG register. |
| */ |
| if (oh->class->sysc) { |
| _update_sysc_cache(oh); |
| _sysc_enable(oh); |
| } |
| } |
| |
| if (!(oh->flags & HWMOD_INIT_NO_IDLE) && !skip_setup_idle) |
| _omap_hwmod_idle(oh); |
| |
| return 0; |
| } |
| |
| |
| |
| /* Public functions */ |
| |
| u32 omap_hwmod_readl(struct omap_hwmod *oh, u16 reg_offs) |
| { |
| return __raw_readl(oh->_mpu_rt_va + reg_offs); |
| } |
| |
| void omap_hwmod_writel(u32 v, struct omap_hwmod *oh, u16 reg_offs) |
| { |
| __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); |
| |
| 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 |
| * @skip_setup_idle: if 1, do not idle hwmods in _setup() |
| * |
| * 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(u8 skip_setup_idle) |
| { |
| 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); |
| |
| if (skip_setup_idle) |
| pr_debug("omap_hwmod: will leave hwmods enabled during setup\n"); |
| |
| omap_hwmod_for_each(_setup, &skip_setup_idle); |
| |
| 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_hwomd @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; |
| |
| if (!oh) |
| return -EINVAL; |
| |
| mutex_lock(&oh->_mutex); |
| r = _omap_hwmod_enable(oh); |
| mutex_unlock(&oh->_mutex); |
| |
| return r; |
| } |
| |
| |
| /** |
| * omap_hwmod_idle - idle an omap_hwmod |
| * @oh: struct omap_hwmod * |
| * |
| * Idle an omap_hwomd @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) |
| { |
| if (!oh) |
| return -EINVAL; |
| |
| mutex_lock(&oh->_mutex); |
| _omap_hwmod_idle(oh); |
| mutex_unlock(&oh->_mutex); |
| |
| return 0; |
| } |
| |
| /** |
| * omap_hwmod_shutdown - shutdown an omap_hwmod |
| * @oh: struct omap_hwmod * |
| * |
| * Shutdown an omap_hwomd @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) |
| { |
| if (!oh) |
| return -EINVAL; |
| |
| mutex_lock(&oh->_mutex); |
| _shutdown(oh); |
| mutex_unlock(&oh->_mutex); |
| |
| 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) |
| { |
| mutex_lock(&oh->_mutex); |
| _enable_clocks(oh); |
| mutex_unlock(&oh->_mutex); |
| |
| 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) |
| { |
| mutex_lock(&oh->_mutex); |
| _disable_clocks(oh); |
| mutex_unlock(&oh->_mutex); |
| |
| 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_readl(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; |
| |
| if (!oh) |
| return -EINVAL; |
| |
| mutex_lock(&oh->_mutex); |
| r = _reset(oh); |
| mutex_unlock(&oh->_mutex); |
| |
| 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) |
| { |
| if (!oh->class->sysc || |
| !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) |
| return -EINVAL; |
| |
| mutex_lock(&oh->_mutex); |
| _enable_wakeup(oh); |
| mutex_unlock(&oh->_mutex); |
| |
| 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) |
| { |
| if (!oh->class->sysc || |
| !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) |
| return -EINVAL; |
| |
| mutex_lock(&oh->_mutex); |
| _disable_wakeup(oh); |
| mutex_unlock(&oh->_mutex); |
| |
| 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; |
| |
| if (!oh) |
| return -EINVAL; |
| |
| mutex_lock(&oh->_mutex); |
| ret = _assert_hardreset(oh, name); |
| mutex_unlock(&oh->_mutex); |
| |
| 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; |
| |
| if (!oh) |
| return -EINVAL; |
| |
| mutex_lock(&oh->_mutex); |
| ret = _deassert_hardreset(oh, name); |
| mutex_unlock(&oh->_mutex); |
| |
| 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; |
| |
| if (!oh) |
| return -EINVAL; |
| |
| mutex_lock(&oh->_mutex); |
| ret = _read_hardreset(oh, name); |
| mutex_unlock(&oh->_mutex); |
| |
| 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; |
| } |
| |