@@ -3,7 +3,7 @@
#
# Common support
-obj-y := id.o io.o control.o mux.o devices.o serial.o gpmc.o timer-gp.o pm.o
+obj-y := id.o io.o control.o mux.o devices.o serial.o gpmc.o timer-gp.o pm.o dmtimer.o
omap-2-3-common = irq.o sdrc.o
hwmod-common = omap_hwmod.o \
new file mode 100644
@@ -0,0 +1,288 @@
+/**
+ * linux/arch/arm/mach-omap2/dmtimer.c
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ * Thara Gopinath <thara@ti.com>
+ * Tarun Kanti DebBarma <tarun.kanti@ti.com>
+ * - Highlander ip support on omap4
+ * - hwmod support
+ *
+ * OMAP2 Dual-Mode Timers
+ * 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+
+#include <mach/irqs.h>
+#include <plat/dmtimer.h>
+#include <plat/omap_hwmod.h>
+#include <plat/omap_device.h>
+#include <linux/pm_runtime.h>
+
+static int early_timer_count __initdata = 1;
+
+/**
+ * omap2_dm_timer_set_src - change the timer input clock source
+ * @pdev: timer platform device pointer
+ * @timer_clk: current clock source
+ * @source: array index of parent clock source
+ */
+static int omap2_dm_timer_set_src(struct platform_device *pdev, int source)
+{
+ int ret;
+ struct dmtimer_platform_data *pdata = pdev->dev.platform_data;
+ struct clk *timer_clk = clk_get(&pdev->dev, "fck");
+
+ if (IS_ERR(timer_clk)) {
+ dev_warn(&pdev->dev, "%s: Not able get the clock pointer\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ ret = clk_set_parent(timer_clk, pdata->source_clocks[source]);
+ if (ret)
+ dev_warn(&pdev->dev, "%s: Not able to change "
+ "fclk source\n", __func__);
+
+ return ret;
+}
+
+/**
+ * omap2_dm_timer_setup - acquire clock structure associated with
+ * current omap platform
+ * @clk_name: array of clock source names
+ * @clk_src: array of struct clk associated with each clk_name's
+ *
+ * timers in different omap platform support different types of clocks
+ * as input source. there is a static array of struct clk * as its
+ * elements which are initialized to point to respective clk structure.
+ * the clk structures are obtained using clk_get() which fetches the
+ * clock pointer from a omap platform specific static clock array.
+ * these clk* elements are finally used while changing the input clock
+ * source of the timers.
+ */
+static void __init
+omap2_dm_timer_setup(char **clk_name, struct clk **clk_src)
+{
+ int i;
+
+ /* Initialize the dmtimer src clocks */
+ for (i = 0; clk_name[i] != NULL; i++)
+ clk_src[i] = clk_get(NULL, clk_name[i]);
+}
+
+struct omap_device_pm_latency omap2_dmtimer_latency[] = {
+ {
+ .deactivate_func = omap_device_idle_hwmods,
+ .activate_func = omap_device_enable_hwmods,
+ .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
+ },
+};
+
+/**
+ * omap_dm_timer_early_init - build and register early timer device
+ * with an associated timer hwmod
+ * @oh: timer hwmod pointer to be used to build timer device
+ * @user: parameter that can be passed from calling hwmod API
+ *
+ * early init is called in the last part of omap2_init_common_hw
+ * for each early timer class using omap_hwmod_for_each_by_class.
+ * it registers each of the timer devices present in the system.
+ * at the end of function call memory is allocated for omap_device
+ * and hwmod for early timer and the device is registered to the
+ * framework ready to be probed by the driver.
+ */
+static int __init omap_dm_timer_early_init(struct omap_hwmod *oh, void *user)
+{
+ int id;
+ int ret = 0;
+ char *name = "dmtimer";
+ struct dmtimer_platform_data *pdata;
+ struct omap_device *od;
+ struct omap_timer_dev_attr *timer_dev_attr;
+
+ if (!oh) {
+ pr_err("%s:Could not find [%s]\n", __func__, oh->name);
+ return -EINVAL;
+ }
+
+ pr_debug("%s:%s\n", __func__, oh->name);
+
+ pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+ if (!pdata) {
+ pr_err("%s: No memory for [%s]\n", __func__, oh->name);
+ return -ENOMEM;
+ }
+
+ pdata->is_early_init = true;
+
+ /* hook clock set/get functions */
+ pdata->set_timer_src = omap2_dm_timer_set_src;
+
+ /* read timer ip version */
+ pdata->timer_ip_type = oh->class->rev;
+
+ timer_dev_attr = oh->dev_attr;
+
+ /* read register map into platform data */
+ pdata->reg_map = (u32 *)timer_dev_attr->reg_map;
+
+ /*
+ * array of clock source names are part of hwmod database
+ * use this are to extract 'struct clk' corresponding to
+ * each clock names. this is used to change the clock
+ * sources of the timers.
+ */
+ omap2_dm_timer_setup((char **)timer_dev_attr->clk_names,
+ pdata->source_clocks);
+ /*
+ * extract the id from name filed in hwmod database
+ * and use the same for constructing ids' for the
+ * timer devices. in a way, we are avoiding usage of
+ * static variable witin the function to do the same.
+ * CAUTION: we have to be careful and make sure the
+ * name in hwmod database does not change in which case
+ * we might either make corresponding change here or
+ * switch back static variable mechanism.
+ */
+ sscanf(oh->name, "timer%2d", &id);
+
+ od = omap_device_build(name, id - 1, oh, pdata, sizeof(*pdata),
+ omap2_dmtimer_latency,
+ ARRAY_SIZE(omap2_dmtimer_latency), 1);
+
+ if (IS_ERR(od)) {
+ pr_err("%s: Cant build omap_device for %s:%s.\n",
+ __func__, name, oh->name);
+ ret = -EINVAL;
+ } else
+ early_timer_count++;
+ /*
+ * pdata can be freed because omap_device_build
+ * creates its own memory pool
+ */
+ kfree(pdata);
+
+ return ret;
+}
+
+/**
+ * omap2_dm_timer_init - build and register timer device with an
+ * associated timer hwmod
+ * @oh: timer hwmod pointer to be used to build timer device
+ * @user: parameter that can be passed from calling hwmod API
+ *
+ * called by omap_hwmod_for_each_by_class to register each of the timer
+ * devices present in the system. the number of timer devices is known
+ * by parsing through the hwmod database for a given class name. at the
+ * end of function call memory is allocated for omap_device and hwmod
+ * for timer and the device is registered to the framework ready to be
+ * proved by the driver.
+ */
+static int __init omap2_dm_timer_init(struct omap_hwmod *oh, void *user)
+{
+ int id;
+ int ret = 0;
+ char *name = "dmtimer";
+ struct omap_device *od;
+ struct dmtimer_platform_data *pdata;
+ struct omap_timer_dev_attr *timer_dev_attr;
+
+ if (!oh) {
+ pr_err("%s:NULL hwmod pointer (oh)\n", __func__);
+ return -EINVAL;
+ }
+ pr_debug("%s:%s\n", __func__, oh->name);
+
+ pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+ if (!pdata) {
+ pr_err("%s:No memory for [%s]\n", __func__, oh->name);
+ return -ENOMEM;
+ }
+
+ pdata->is_early_init = false;
+
+ /* hook clock set/get functions */
+ pdata->set_timer_src = omap2_dm_timer_set_src;
+
+ /* read timer ip version */
+ pdata->timer_ip_type = oh->class->rev;
+
+ /*
+ * array of clock source names are part of hwmod database
+ * use this are to extract 'struct clk' corresponding to
+ * each clock names. this is used to change the clock
+ * sources of the timers.
+ */
+ timer_dev_attr = oh->dev_attr;
+
+ /* read register map into platform data */
+ pdata->reg_map = (u32 *)timer_dev_attr->reg_map;
+
+ /* populate the 'clk' structure from clk_names */
+ omap2_dm_timer_setup((char **)timer_dev_attr->clk_names,
+ pdata->source_clocks);
+
+ /*
+ * extract the id from name filed in hwmod database
+ * and use the same for constructing ids' for the
+ * timer devices. in a way, we are avoiding usage of
+ * static variable witin the function to do the same.
+ * CAUTION: we have to be careful and make sure the
+ * name in hwmod database does not change in which case
+ * we might either make corresponding change here or
+ * switch back static variable mechanism.
+ */
+ sscanf(oh->name, "timer%2d", &id);
+
+ od = omap_device_build(name, id - 1, oh,
+ pdata, sizeof(*pdata),
+ omap2_dmtimer_latency,
+ ARRAY_SIZE(omap2_dmtimer_latency), 0);
+
+ if (IS_ERR(od)) {
+ pr_err("%s: Cant build omap_device for %s:%s.\n",
+ __func__, name, oh->name);
+ ret = -EINVAL;
+ }
+ /*
+ * pdata can be freed because omap_device_build
+ * creates its own memory pool
+ */
+ kfree(pdata);
+ return ret;
+}
+
+/**
+ * omap2_dm_timer_early_init - top level early timer initialization
+ * called in the last part of omap2_init_common_hw
+ *
+ * uses dedicated hwmod api to parse through hwmod database for
+ * given class name and then build and register the timer device.
+ * at the end driver is registered and early probe initiated.
+ */
+void __init omap2_dm_timer_early_init(void)
+{
+ omap_hwmod_for_each_by_class("timer", omap_dm_timer_early_init, NULL);
+ early_platform_driver_register_all("earlytimer");
+ early_platform_driver_probe("earlytimer", early_timer_count, 0);
+}
+
+/**
+ * omap_timer_init - top level timer device initialization
+ *
+ * uses dedicated hwmod api to parse through hwmod database for
+ * given class names and then build and register the timer device.
+ */
+static int __init omap2_dmtimer_device_init(void)
+{
+ omap_hwmod_for_each_by_class("timer", omap2_dm_timer_init, NULL);
+ return 0;
+}
+arch_initcall(omap2_dmtimer_device_init);