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authorGregory Bean <gbean@codeaurora.org>2010-08-28 10:05:44 -0700
committerDaniel Walker <dwalker@codeaurora.org>2010-10-06 09:01:15 -0700
commit1963a2afc81afe6d85e7a12538b74a9919d958ae (patch)
treef1486399cfce632819509cb86639d3106d539805 /arch/arm/mach-msm/gpiomux.c
parent846afbd1fe015e082c89d56dd42c484d896ef58e (diff)
downloadop-kernel-dev-1963a2afc81afe6d85e7a12538b74a9919d958ae.zip
op-kernel-dev-1963a2afc81afe6d85e7a12538b74a9919d958ae.tar.gz
msm: add gpiomux api for gpio multiplex & configuration.
Add the 'gpiomux' api, which addresses the following shortcomings of existing tlmm api: - gpio power-collapse, which is managed by a peripheral processor on other targets, must be managed by the application processor on the 8x60. - The enable/disable flag of the legacy gpio_tlmm_config api is not applicable on the 8x60, and causes confusion. - The gpio 'direction' bits are meaningless for all func_sel configurations except for generic-gpio mode (func_sel 0), in which case the gpio_direction_* functions should be used. Having these bits in the tlmm api leads to confusion and misuse of the gpiolib api, and they have been removed in gpiomux. - The functional api of the legacy system ran contrary to the typical use-case, which is a single massive configuration at boot. Rather than forcing hundreds of 'config' function calls, the new api allows data to be configured with a single table. gpiomux_get and gpiomux_put are meant to be called automatically when gpio_request and gpio_free are called, giving automatic gpiomux/tlmm control to those drivers/lines with simple power profiles - in the simplest cases, an entry in the gpiomux table and the correct usage of gpiolib is all that is required to get proper gpio power control. Signed-off-by: Gregory Bean <gbean@codeaurora.org> Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
Diffstat (limited to 'arch/arm/mach-msm/gpiomux.c')
-rw-r--r--arch/arm/mach-msm/gpiomux.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/gpiomux.c b/arch/arm/mach-msm/gpiomux.c
new file mode 100644
index 0000000..53af21a
--- /dev/null
+++ b/arch/arm/mach-msm/gpiomux.c
@@ -0,0 +1,96 @@
+/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include "gpiomux.h"
+
+static DEFINE_SPINLOCK(gpiomux_lock);
+
+int msm_gpiomux_write(unsigned gpio,
+ gpiomux_config_t active,
+ gpiomux_config_t suspended)
+{
+ struct msm_gpiomux_config *cfg = msm_gpiomux_configs + gpio;
+ unsigned long irq_flags;
+ gpiomux_config_t setting;
+
+ if (gpio >= GPIOMUX_NGPIOS)
+ return -EINVAL;
+
+ spin_lock_irqsave(&gpiomux_lock, irq_flags);
+
+ if (active & GPIOMUX_VALID)
+ cfg->active = active;
+
+ if (suspended & GPIOMUX_VALID)
+ cfg->suspended = suspended;
+
+ setting = cfg->ref ? active : suspended;
+ if (setting & GPIOMUX_VALID)
+ __msm_gpiomux_write(gpio, setting);
+
+ spin_unlock_irqrestore(&gpiomux_lock, irq_flags);
+ return 0;
+}
+EXPORT_SYMBOL(msm_gpiomux_write);
+
+int msm_gpiomux_get(unsigned gpio)
+{
+ struct msm_gpiomux_config *cfg = msm_gpiomux_configs + gpio;
+ unsigned long irq_flags;
+
+ if (gpio >= GPIOMUX_NGPIOS)
+ return -EINVAL;
+
+ spin_lock_irqsave(&gpiomux_lock, irq_flags);
+ if (cfg->ref++ == 0 && cfg->active & GPIOMUX_VALID)
+ __msm_gpiomux_write(gpio, cfg->active);
+ spin_unlock_irqrestore(&gpiomux_lock, irq_flags);
+ return 0;
+}
+EXPORT_SYMBOL(msm_gpiomux_get);
+
+int msm_gpiomux_put(unsigned gpio)
+{
+ struct msm_gpiomux_config *cfg = msm_gpiomux_configs + gpio;
+ unsigned long irq_flags;
+
+ if (gpio >= GPIOMUX_NGPIOS)
+ return -EINVAL;
+
+ spin_lock_irqsave(&gpiomux_lock, irq_flags);
+ BUG_ON(cfg->ref == 0);
+ if (--cfg->ref == 0 && cfg->suspended & GPIOMUX_VALID)
+ __msm_gpiomux_write(gpio, cfg->suspended);
+ spin_unlock_irqrestore(&gpiomux_lock, irq_flags);
+ return 0;
+}
+EXPORT_SYMBOL(msm_gpiomux_put);
+
+static int __init gpiomux_init(void)
+{
+ unsigned n;
+
+ for (n = 0; n < GPIOMUX_NGPIOS; ++n) {
+ msm_gpiomux_configs[n].ref = 0;
+ if (!(msm_gpiomux_configs[n].suspended & GPIOMUX_VALID))
+ continue;
+ __msm_gpiomux_write(n, msm_gpiomux_configs[n].suspended);
+ }
+ return 0;
+}
+postcore_initcall(gpiomux_init);
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