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msm: add gpiomux api for gpio multiplex & configuration.

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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>
This commit is contained in:
Gregory Bean 2010-08-28 10:05:44 -07:00 committed by Daniel Walker
parent 846afbd1fe
commit 1963a2afc8
13 changed files with 482 additions and 0 deletions
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2
arch/arm/mach-msm/Kconfig
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@ -106,4 +106,6 @@ config MSM_SMD_PKG3
config MSM_SMD
bool
config MSM_V2_TLMM
bool
endif

3
arch/arm/mach-msm/Makefile
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@ -20,3 +20,6 @@ obj-$(CONFIG_MACH_HALIBUT) += board-halibut.o devices-msm7x00.o
obj-$(CONFIG_ARCH_MSM7X30) += board-msm7x30.o devices-msm7x30.o
obj-$(CONFIG_ARCH_QSD8X50) += board-qsd8x50.o devices-qsd8x50.o
obj-$(CONFIG_ARCH_MSM7X30) += gpiomux-7x30.o gpiomux-v1.o gpiomux.o
obj-$(CONFIG_ARCH_QSD8X50) += gpiomux-8x50.o gpiomux-v1.o gpiomux.o
obj-$(CONFIG_ARCH_MSM8X60) += gpiomux-8x60.o gpiomux-v2.o gpiomux.o

19
arch/arm/mach-msm/gpiomux-7x30.c Normal file
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@ -0,0 +1,19 @@
/* 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 "gpiomux.h"
struct msm_gpiomux_config msm_gpiomux_configs[GPIOMUX_NGPIOS] = {};

19
arch/arm/mach-msm/gpiomux-8x50.c Normal file
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@ -0,0 +1,19 @@
/* 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 "gpiomux.h"
struct msm_gpiomux_config msm_gpiomux_configs[GPIOMUX_NGPIOS] = {};

19
arch/arm/mach-msm/gpiomux-8x60.c Normal file
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@ -0,0 +1,19 @@
/* 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 "gpiomux.h"
struct msm_gpiomux_config msm_gpiomux_configs[GPIOMUX_NGPIOS] = {};

33
arch/arm/mach-msm/gpiomux-v1.c Normal file
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@ -0,0 +1,33 @@
/* 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/kernel.h>
#include "gpiomux.h"
#include "proc_comm.h"
void __msm_gpiomux_write(unsigned gpio, gpiomux_config_t val)
{
unsigned tlmm_config = (val & ~GPIOMUX_CTL_MASK) |
((gpio & 0x3ff) << 4);
unsigned tlmm_disable = 0;
int rc;
rc = msm_proc_comm(PCOM_RPC_GPIO_TLMM_CONFIG_EX,
&tlmm_config, &tlmm_disable);
if (rc)
pr_err("%s: unexpected proc_comm failure %d: %08x %08x\n",
__func__, rc, tlmm_config, tlmm_disable);
}

67
arch/arm/mach-msm/gpiomux-v1.h Normal file
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@ -0,0 +1,67 @@
/* 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.
*/
#ifndef __ARCH_ARM_MACH_MSM_GPIOMUX_V1_H
#define __ARCH_ARM_MACH_MSM_GPIOMUX_V1_H
#if defined(CONFIG_ARCH_MSM7X30)
#define GPIOMUX_NGPIOS 182
#elif defined(CONFIG_ARCH_QSD8X50)
#define GPIOMUX_NGPIOS 165
#else
#define GPIOMUX_NGPIOS 133
#endif
typedef u32 gpiomux_config_t;
enum {
GPIOMUX_DRV_2MA = 0UL << 17,
GPIOMUX_DRV_4MA = 1UL << 17,
GPIOMUX_DRV_6MA = 2UL << 17,
GPIOMUX_DRV_8MA = 3UL << 17,
GPIOMUX_DRV_10MA = 4UL << 17,
GPIOMUX_DRV_12MA = 5UL << 17,
GPIOMUX_DRV_14MA = 6UL << 17,
GPIOMUX_DRV_16MA = 7UL << 17,
};
enum {
GPIOMUX_FUNC_GPIO = 0UL,
GPIOMUX_FUNC_1 = 1UL,
GPIOMUX_FUNC_2 = 2UL,
GPIOMUX_FUNC_3 = 3UL,
GPIOMUX_FUNC_4 = 4UL,
GPIOMUX_FUNC_5 = 5UL,
GPIOMUX_FUNC_6 = 6UL,
GPIOMUX_FUNC_7 = 7UL,
GPIOMUX_FUNC_8 = 8UL,
GPIOMUX_FUNC_9 = 9UL,
GPIOMUX_FUNC_A = 10UL,
GPIOMUX_FUNC_B = 11UL,
GPIOMUX_FUNC_C = 12UL,
GPIOMUX_FUNC_D = 13UL,
GPIOMUX_FUNC_E = 14UL,
GPIOMUX_FUNC_F = 15UL,
};
enum {
GPIOMUX_PULL_NONE = 0UL << 15,
GPIOMUX_PULL_DOWN = 1UL << 15,
GPIOMUX_PULL_KEEPER = 2UL << 15,
GPIOMUX_PULL_UP = 3UL << 15,
};
#endif

25
arch/arm/mach-msm/gpiomux-v2.c Normal file
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@ -0,0 +1,25 @@
/* 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/io.h>
#include <mach/msm_iomap.h>
#include "gpiomux.h"
void __msm_gpiomux_write(unsigned gpio, gpiomux_config_t val)
{
writel(val & ~GPIOMUX_CTL_MASK,
MSM_TLMM_BASE + 0x1000 + (0x10 * gpio));
}

61
arch/arm/mach-msm/gpiomux-v2.h Normal file
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@ -0,0 +1,61 @@
/* 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.
*/
#ifndef __ARCH_ARM_MACH_MSM_GPIOMUX_V2_H
#define __ARCH_ARM_MACH_MSM_GPIOMUX_V2_H
#define GPIOMUX_NGPIOS 173
typedef u16 gpiomux_config_t;
enum {
GPIOMUX_DRV_2MA = 0UL << 6,
GPIOMUX_DRV_4MA = 1UL << 6,
GPIOMUX_DRV_6MA = 2UL << 6,
GPIOMUX_DRV_8MA = 3UL << 6,
GPIOMUX_DRV_10MA = 4UL << 6,
GPIOMUX_DRV_12MA = 5UL << 6,
GPIOMUX_DRV_14MA = 6UL << 6,
GPIOMUX_DRV_16MA = 7UL << 6,
};
enum {
GPIOMUX_FUNC_GPIO = 0UL << 2,
GPIOMUX_FUNC_1 = 1UL << 2,
GPIOMUX_FUNC_2 = 2UL << 2,
GPIOMUX_FUNC_3 = 3UL << 2,
GPIOMUX_FUNC_4 = 4UL << 2,
GPIOMUX_FUNC_5 = 5UL << 2,
GPIOMUX_FUNC_6 = 6UL << 2,
GPIOMUX_FUNC_7 = 7UL << 2,
GPIOMUX_FUNC_8 = 8UL << 2,
GPIOMUX_FUNC_9 = 9UL << 2,
GPIOMUX_FUNC_A = 10UL << 2,
GPIOMUX_FUNC_B = 11UL << 2,
GPIOMUX_FUNC_C = 12UL << 2,
GPIOMUX_FUNC_D = 13UL << 2,
GPIOMUX_FUNC_E = 14UL << 2,
GPIOMUX_FUNC_F = 15UL << 2,
};
enum {
GPIOMUX_PULL_NONE = 0UL,
GPIOMUX_PULL_DOWN = 1UL,
GPIOMUX_PULL_KEEPER = 2UL,
GPIOMUX_PULL_UP = 3UL,
};
#endif

96
arch/arm/mach-msm/gpiomux.c Normal file
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@ -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);

94
arch/arm/mach-msm/gpiomux.h Normal file
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@ -0,0 +1,94 @@
/* 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.
*/
#ifndef __ARCH_ARM_MACH_MSM_GPIOMUX_H
#define __ARCH_ARM_MACH_MSM_GPIOMUX_H
#include <linux/bitops.h>
#if defined(CONFIG_MSM_V2_TLMM)
#include "gpiomux-v2.h"
#else
#include "gpiomux-v1.h"
#endif
/**
* struct msm_gpiomux_config: gpiomux settings for one gpio line.
*
* A complete gpiomux config is the bitwise-or of a drive-strength,
* function, and pull. For functions other than GPIO, the OE
* is hard-wired according to the function. For GPIO mode,
* OE is controlled by gpiolib.
*
* Available settings differ by target; see the gpiomux header
* specific to your target arch for available configurations.
*
* @active: The configuration to be installed when the line is
* active, or its reference count is > 0.
* @suspended: The configuration to be installed when the line
* is suspended, or its reference count is 0.
* @ref: The reference count of the line. For internal use of
* the gpiomux framework only.
*/
struct msm_gpiomux_config {
gpiomux_config_t active;
gpiomux_config_t suspended;
unsigned ref;
};
/**
* @GPIOMUX_VALID: If set, the config field contains 'good data'.
* The absence of this bit will prevent the gpiomux
* system from applying the configuration under all
* circumstances.
*/
enum {
GPIOMUX_VALID = BIT(sizeof(gpiomux_config_t) * BITS_PER_BYTE - 1),
GPIOMUX_CTL_MASK = GPIOMUX_VALID,
};
/* Each architecture must provide its own instance of this table.
* To avoid having gpiomux manage any given gpio, one or both of
* the entries can avoid setting GPIOMUX_VALID - the absence
* of that flag will prevent the configuration from being applied
* during state transitions.
*/
extern struct msm_gpiomux_config msm_gpiomux_configs[GPIOMUX_NGPIOS];
/* Increment a gpio's reference count, possibly activating the line. */
int __must_check msm_gpiomux_get(unsigned gpio);
/* Decrement a gpio's reference count, possibly suspending the line. */
int msm_gpiomux_put(unsigned gpio);
/* Install a new configuration to the gpio line. To avoid overwriting
* a configuration, leave the VALID bit out.
*/
int msm_gpiomux_write(unsigned gpio,
gpiomux_config_t active,
gpiomux_config_t suspended);
/* Architecture-internal function for use by the framework only.
* This function can assume the following:
* - the gpio value has passed a bounds-check
* - the gpiomux spinlock has been obtained
*
* This function is not for public consumption. External users
* should use msm_gpiomux_write.
*/
void __msm_gpiomux_write(unsigned gpio, gpiomux_config_t val);
#endif

42
arch/arm/mach-msm/include/mach/msm_iomap-8x60.h Normal file
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@ -0,0 +1,42 @@
/*
* Copyright (C) 2007 Google, Inc.
* Copyright (c) 2008-2010, Code Aurora Forum. All rights reserved.
* Author: Brian Swetland <swetland@google.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*
* The MSM peripherals are spread all over across 768MB of physical
* space, which makes just having a simple IO_ADDRESS macro to slide
* them into the right virtual location rough. Instead, we will
* provide a master phys->virt mapping for peripherals here.
*
*/
#ifndef __ASM_ARCH_MSM_IOMAP_8X60_H
#define __ASM_ARCH_MSM_IOMAP_8X60_H
/* Physical base address and size of peripherals.
* Ordered by the virtual base addresses they will be mapped at.
*
* MSM_VIC_BASE must be an value that can be loaded via a "mov"
* instruction, otherwise entry-macro.S will not compile.
*
* If you add or remove entries here, you'll want to edit the
* msm_io_desc array in arch/arm/mach-msm/io.c to reflect your
* changes.
*
*/
#define MSM_TLMM_BASE IOMEM(0xF0004000)
#define MSM_TLMM_PHYS 0x00800000
#define MSM_TLMM_SIZE SZ_16K
#endif

2
arch/arm/mach-msm/include/mach/msm_iomap.h
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@ -47,6 +47,8 @@
#include "msm_iomap-7x30.h"
#elif defined(CONFIG_ARCH_QSD8X50)
#include "msm_iomap-8x50.h"
#elif defined(CONFIG_ARCH_MSM8X60)
#include "msm_iomap-8x60.h"
#else
#include "msm_iomap-7x00.h"
#endif