From patchwork Mon Jul 11 11:21:29 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tarun Kanti DebBarma X-Patchwork-Id: 964302 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter2.kernel.org (8.14.4/8.14.4) with ESMTP id p6BCmiq2005084 for ; Mon, 11 Jul 2011 12:48:44 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753122Ab1GKMsn (ORCPT ); Mon, 11 Jul 2011 08:48:43 -0400 Received: from arroyo.ext.ti.com ([192.94.94.40]:54940 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751344Ab1GKMsn (ORCPT ); Mon, 11 Jul 2011 08:48:43 -0400 Received: from dbdp20.itg.ti.com ([172.24.170.38]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id p6BCmYP3016140 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 11 Jul 2011 07:48:36 -0500 Received: from dbde71.ent.ti.com (localhost [127.0.0.1]) by dbdp20.itg.ti.com (8.13.8/8.13.8) with ESMTP id p6BCmDrl012454; Mon, 11 Jul 2011 18:18:33 +0530 (IST) Received: from dbdp31.itg.ti.com (172.24.170.98) by DBDE71.ent.ti.com (172.24.170.149) with Microsoft SMTP Server id 8.3.106.1; Mon, 11 Jul 2011 16:51:54 +0530 Received: from localhost.localdomain ([172.24.190.106]) by dbdp31.itg.ti.com (8.13.8/8.13.8) with ESMTP id p6BBLap4020454; Mon, 11 Jul 2011 16:51:50 +0530 (IST) From: Tarun Kanti DebBarma To: CC: , , , , Tarun Kanti DebBarma , Thara Gopinath Subject: [PATCH v14 05/12] OMAP: dmtimer: platform driver Date: Mon, 11 Jul 2011 16:51:29 +0530 Message-ID: <1310383296-18956-6-git-send-email-tarun.kanti@ti.com> X-Mailer: git-send-email 1.6.0.4 In-Reply-To: <1310383296-18956-1-git-send-email-tarun.kanti@ti.com> References: <1310383296-18956-1-git-send-email-tarun.kanti@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter2.kernel.org [140.211.167.43]); Mon, 11 Jul 2011 12:48:45 +0000 (UTC) Add dmtimer platform driver functions which include: (1) platform driver initialization (2) driver probe function (3) driver remove function Signed-off-by: Tarun Kanti DebBarma Signed-off-by: Thara Gopinath Acked-by: Cousson, Benoit --- arch/arm/plat-omap/dmtimer.c | 159 +++++++++++++++++++++++++++-- arch/arm/plat-omap/include/plat/dmtimer.h | 11 ++ 2 files changed, 163 insertions(+), 7 deletions(-) diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c index 995bab0..c5573c3 100644 --- a/arch/arm/plat-omap/dmtimer.c +++ b/arch/arm/plat-omap/dmtimer.c @@ -35,14 +35,9 @@ * 675 Mass Ave, Cambridge, MA 02139, USA. */ -#include -#include -#include -#include -#include -#include #include #include +#include #include #include #include @@ -149,6 +144,7 @@ static const char **dm_source_names; static struct clk **dm_source_clocks; static spinlock_t dm_timer_lock; +static LIST_HEAD(omap_timer_list); /* * Reads timer registers in posted and non-posted mode. The posted mode bit @@ -544,7 +540,156 @@ int omap_dm_timers_active(void) } EXPORT_SYMBOL_GPL(omap_dm_timers_active); -static int __init omap_dm_timer_init(void) +/** + * omap_dm_timer_probe - probe function called for every registered device + * @pdev: pointer to current timer platform device + * + * Called by driver framework at the end of device registration for all + * timer devices. + */ +static int __devinit omap_dm_timer_probe(struct platform_device *pdev) +{ + int ret; + unsigned long flags; + struct omap_dm_timer *timer; + struct resource *mem, *irq, *ioarea; + struct dmtimer_platform_data *pdata = pdev->dev.platform_data; + + if (!pdata) { + dev_err(&pdev->dev, "%s: no platform data.\n", __func__); + return -ENODEV; + } + + irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (unlikely(!irq)) { + dev_err(&pdev->dev, "%s: no IRQ resource.\n", __func__); + ret = -ENODEV; + goto err_free_pdev; + } + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (unlikely(!mem)) { + dev_err(&pdev->dev, "%s: no memory resource.\n", __func__); + ret = -ENODEV; + goto err_free_pdev; + } + + ioarea = request_mem_region(mem->start, resource_size(mem), + pdev->name); + if (!ioarea) { + dev_err(&pdev->dev, "%s: region already claimed.\n", __func__); + ret = -EBUSY; + goto err_free_pdev; + } + + timer = kzalloc(sizeof(struct omap_dm_timer), GFP_KERNEL); + if (!timer) { + dev_err(&pdev->dev, "%s: no memory for omap_dm_timer.\n", + __func__); + ret = -ENOMEM; + goto err_release_ioregion; + } + + timer->io_base = ioremap(mem->start, resource_size(mem)); + if (!timer->io_base) { + dev_err(&pdev->dev, "%s: ioremap failed.\n", __func__); + ret = -ENOMEM; + goto err_free_mem; + } + + if (pdata->timer_ip_type == OMAP_TIMER_IP_VERSION_2) { + timer->func_offset = VERSION2_TIMER_WAKEUP_EN_REG_OFFSET; + timer->intr_offset = VERSION2_TIMER_STAT_REG_OFFSET; + } else { + timer->func_offset = 0; + timer->intr_offset = 0; + } + + timer->id = pdev->id; + timer->irq = irq->start; + timer->pdev = pdev; + timer->reserved = 0; + + /* add the timer element to the list */ + spin_lock_irqsave(&dm_timer_lock, flags); + list_add_tail(&timer->node, &omap_timer_list); + spin_unlock_irqrestore(&dm_timer_lock, flags); + + dev_dbg(&pdev->dev, "Device Probed.\n"); + + return 0; + +err_free_mem: + kfree(timer); + +err_release_ioregion: + release_mem_region(mem->start, resource_size(mem)); + +err_free_pdev: + kfree(pdata); + platform_device_unregister(pdev); + + return ret; +} + +/** + * omap_dm_timer_remove - cleanup a registered timer device + * @pdev: pointer to current timer platform device + * + * Called by driver framework whenever a timer device is unregistered. + * In addition to freeing platform resources it also deletes the timer + * entry from the local list. + */ +static int __devexit omap_dm_timer_remove(struct platform_device *pdev) +{ + struct omap_dm_timer *timer, *tmp; + unsigned long flags; + int ret = -EINVAL; + + spin_lock_irqsave(&dm_timer_lock, flags); + list_for_each_entry_safe(timer, tmp, &omap_timer_list, node) { + if (timer->pdev->id == pdev->id) { + kfree(timer->pdev->dev.platform_data); + platform_device_del(timer->pdev); + list_del(&timer->node); + kfree(timer); + ret = 0; + break; + } + } + spin_unlock_irqrestore(&dm_timer_lock, flags); + + return ret; +} + +static struct platform_driver omap_dm_timer_driver = { + .probe = omap_dm_timer_probe, + .remove = omap_dm_timer_remove, + .driver = { + .name = "omap_timer", + }, +}; + +static int __init omap_dm_timer_driver_init(void) +{ + return platform_driver_register(&omap_dm_timer_driver); +} + +static void __exit omap_dm_timer_driver_exit(void) +{ + platform_driver_unregister(&omap_dm_timer_driver); +} + +early_platform_init("earlytimer", &omap_dm_timer_driver); +module_init(omap_dm_timer_driver_init); +module_exit(omap_dm_timer_driver_exit); + +MODULE_DESCRIPTION("OMAP Dual-Mode Timer Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRIVER_NAME); +MODULE_AUTHOR("Texas Instruments Inc"); + +int __init omap_dm_timer_init(void) { struct omap_dm_timer *timer; int i, map_size = SZ_8K; /* Module 4KB + L4 4KB except on omap1 */ diff --git a/arch/arm/plat-omap/include/plat/dmtimer.h b/arch/arm/plat-omap/include/plat/dmtimer.h index 400fe3c..833a33b 100644 --- a/arch/arm/plat-omap/include/plat/dmtimer.h +++ b/arch/arm/plat-omap/include/plat/dmtimer.h @@ -61,6 +61,13 @@ #define OMAP_TIMER_IP_VERSION_1 0x1 #define OMAP_TIMER_IP_VERSION_2 0x2 +/* + * OMAP4 IP revision has different register offsets + * for interrupt registers and functional registers. + */ +#define VERSION2_TIMER_WAKEUP_EN_REG_OFFSET 0x14 +#define VERSION2_TIMER_STAT_REG_OFFSET 0x10 + /* timer capabilities used in hwmod database */ #define OMAP_TIMER_SECURE 0x80000000 #define OMAP_TIMER_ALWON 0x40000000 @@ -225,6 +232,7 @@ int omap_dm_timers_active(void); struct omap_dm_timer { unsigned long phys_base; + int id; int irq; #ifdef CONFIG_ARCH_OMAP2PLUS struct clk *iclk, *fclk; @@ -234,7 +242,10 @@ struct omap_dm_timer { unsigned reserved:1; unsigned enabled:1; unsigned posted:1; + u8 func_offset; + u8 intr_offset; struct platform_device *pdev; + struct list_head node; }; extern u32 sys_timer_reserved;