pinctrl: add a driver for the U300 pinmux

This adds a driver for the U300 pinmux portions of the system
controller "SYSCON". It also serves as an example of how to use
the pinmux subsystem. This driver also houses the platform data
for the only supported platform.

This deletes the old U300 driver in arch/arm/mach-u300 and
replace it with a driver using the new subsystem.

The new driver is considerably fatter than the old one, but it
also registers all 467 pins of the system and adds the power
and EMIF pin groups and corresponding functions. The idea
is to use this driver as a a reference for other
implementation so it needs to be as complete and verbose
as possible.

Reviewed-by: Barry Song <21cnbao@gmail.com>
[Fixup for changed function names and semantics in the v10 patch]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 0 insertions, 367 deletions

diff --git a/arch/arm/mach-u300/padmux.c b/arch/arm/mach-u300/padmux.c
deleted file mode 100644
index 4c93c6cefd37..000000000000
--- a/arch/arm/mach-u300/padmux.c
+++ /dev/null
@@ -1,367 +0,0 @@
-/*
- *
- * arch/arm/mach-u300/padmux.c
- *
- *
- * Copyright (C) 2009 ST-Ericsson AB
- * License terms: GNU General Public License (GPL) version 2
- * U300 PADMUX functions
- * Author: Martin Persson <martin.persson@stericsson.com>
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/errno.h>
-#include <linux/io.h>
-#include <linux/mutex.h>
-#include <linux/string.h>
-#include <linux/bug.h>
-#include <linux/debugfs.h>
-#include <linux/seq_file.h>
-#include <mach/u300-regs.h>
-#include <mach/syscon.h>
-#include "padmux.h"
-
-static DEFINE_MUTEX(pmx_mutex);
-
-const u32 pmx_registers[] = {
-	(U300_SYSCON_VBASE + U300_SYSCON_PMC1LR),
-	(U300_SYSCON_VBASE + U300_SYSCON_PMC1HR),
-	(U300_SYSCON_VBASE + U300_SYSCON_PMC2R),
-	(U300_SYSCON_VBASE + U300_SYSCON_PMC3R),
-	(U300_SYSCON_VBASE + U300_SYSCON_PMC4R)
-};
-
-/* High level functionality */
-
-/* Lazy dog:
- * onmask = {
- *   {"PMC1LR" mask, "PMC1LR" value},
- *   {"PMC1HR" mask, "PMC1HR" value},
- *   {"PMC2R"  mask, "PMC2R"  value},
- *   {"PMC3R"  mask, "PMC3R"  value},
- *   {"PMC4R"  mask, "PMC4R"  value}
- * }
- */
-static struct pmx mmc_setting = {
-	.setting = U300_APP_PMX_MMC_SETTING,
-	.default_on = false,
-	.activated = false,
-	.name = "MMC",
-	.onmask = {
-		   {U300_SYSCON_PMC1LR_MMCSD_MASK,
-		    U300_SYSCON_PMC1LR_MMCSD_MMCSD},
-		   {0, 0},
-		   {0, 0},
-		   {0, 0},
-		   {U300_SYSCON_PMC4R_APP_MISC_12_MASK,
-		    U300_SYSCON_PMC4R_APP_MISC_12_APP_GPIO}
-		   },
-};
-
-static struct pmx spi_setting = {
-	.setting = U300_APP_PMX_SPI_SETTING,
-	.default_on = false,
-	.activated = false,
-	.name = "SPI",
-	.onmask = {{0, 0},
-		   {U300_SYSCON_PMC1HR_APP_SPI_2_MASK |
-		    U300_SYSCON_PMC1HR_APP_SPI_CS_1_MASK |
-		    U300_SYSCON_PMC1HR_APP_SPI_CS_2_MASK,
-		    U300_SYSCON_PMC1HR_APP_SPI_2_SPI |
-		    U300_SYSCON_PMC1HR_APP_SPI_CS_1_SPI |
-		    U300_SYSCON_PMC1HR_APP_SPI_CS_2_SPI},
-		   {0, 0},
-		   {0, 0},
-		   {0, 0}
-		   },
-};
-
-/* Available padmux settings */
-static struct pmx *pmx_settings[] = {
-	&mmc_setting,
-	&spi_setting,
-};
-
-static void update_registers(struct pmx *pmx, bool activate)
-{
-	u16 regval, val, mask;
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(pmx_registers); i++) {
-		if (activate)
-			val = pmx->onmask[i].val;
-		else
-			val = 0;
-
-		mask = pmx->onmask[i].mask;
-		if (mask != 0) {
-			regval = readw(pmx_registers[i]);
-			regval &= ~mask;
-			regval |= val;
-			writew(regval, pmx_registers[i]);
-		}
-	}
-}
-
-struct pmx *pmx_get(struct device *dev, enum pmx_settings setting)
-{
-	int i;
-	struct pmx *pmx = ERR_PTR(-ENOENT);
-
-	if (dev == NULL)
-		return ERR_PTR(-EINVAL);
-
-	mutex_lock(&pmx_mutex);
-	for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
-
-		if (setting == pmx_settings[i]->setting) {
-
-			if (pmx_settings[i]->dev != NULL) {
-				WARN(1, "padmux: required setting "
-				     "in use by another consumer\n");
-			} else {
-				pmx = pmx_settings[i];
-				pmx->dev = dev;
-				dev_dbg(dev, "padmux: setting nr %d is now "
-					"bound to %s and ready to use\n",
-					setting, dev_name(dev));
-				break;
-			}
-		}
-	}
-	mutex_unlock(&pmx_mutex);
-
-	return pmx;
-}
-EXPORT_SYMBOL(pmx_get);
-
-int pmx_put(struct device *dev, struct pmx *pmx)
-{
-	int i;
-	int ret = -ENOENT;
-
-	if (pmx == NULL || dev == NULL)
-		return -EINVAL;
-
-	mutex_lock(&pmx_mutex);
-	for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
-
-		if (pmx->setting == pmx_settings[i]->setting) {
-
-			if (dev != pmx->dev) {
-				WARN(1, "padmux: cannot release handle as "
-					"it is bound to another consumer\n");
-				ret = -EINVAL;
-				break;
-			} else {
-				pmx_settings[i]->dev = NULL;
-				ret = 0;
-				break;
-			}
-		}
-	}
-	mutex_unlock(&pmx_mutex);
-
-	return ret;
-}
-EXPORT_SYMBOL(pmx_put);
-
-int pmx_activate(struct device *dev, struct pmx *pmx)
-{
-	int i, j, ret;
-	ret = 0;
-
-	if (pmx == NULL || dev == NULL)
-		return -EINVAL;
-
-	mutex_lock(&pmx_mutex);
-
-	/* Make sure the required bits are not used */
-	for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
-
-		if (pmx_settings[i]->dev == NULL || pmx_settings[i] == pmx)
-			continue;
-
-		for (j = 0; j < ARRAY_SIZE(pmx_registers); j++) {
-
-			if (pmx_settings[i]->onmask[j].mask & pmx->
-				onmask[j].mask) {
-				/* More than one entry on the same bits */
-				WARN(1, "padmux: cannot activate "
-					"setting. Bit conflict with "
-					"an active setting\n");
-
-				ret = -EUSERS;
-				goto exit;
-			}
-		}
-	}
-	update_registers(pmx, true);
-	pmx->activated = true;
-	dev_dbg(dev, "padmux: setting nr %d is activated\n",
-		pmx->setting);
-
-exit:
-	mutex_unlock(&pmx_mutex);
-	return ret;
-}
-EXPORT_SYMBOL(pmx_activate);
-
-int pmx_deactivate(struct device *dev, struct pmx *pmx)
-{
-	int i;
-	int ret = -ENOENT;
-
-	if (pmx == NULL || dev == NULL)
-		return -EINVAL;
-
-	mutex_lock(&pmx_mutex);
-	for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
-
-		if (pmx_settings[i]->dev == NULL)
-			continue;
-
-		if (pmx->setting == pmx_settings[i]->setting) {
-
-			if (dev != pmx->dev) {
-				WARN(1, "padmux: cannot deactivate "
-				     "pmx setting as it was activated "
-				     "by another consumer\n");
-
-				ret = -EBUSY;
-				continue;
-			} else {
-				update_registers(pmx, false);
-				pmx_settings[i]->dev = NULL;
-				pmx->activated = false;
-				ret = 0;
-				dev_dbg(dev, "padmux: setting nr %d is deactivated",
-					pmx->setting);
-				break;
-			}
-		}
-	}
-	mutex_unlock(&pmx_mutex);
-
-	return ret;
-}
-EXPORT_SYMBOL(pmx_deactivate);
-
-/*
- * For internal use only. If it is to be exported,
- * it should be reentrant. Notice that pmx_activate
- * (i.e. runtime settings) always override default settings.
- */
-static int pmx_set_default(void)
-{
-	/* Used to identify several entries on the same bits */
-	u16 modbits[ARRAY_SIZE(pmx_registers)];
-
-	int i, j;
-
-	memset(modbits, 0, ARRAY_SIZE(pmx_registers) * sizeof(u16));
-
-	for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
-
-		if (!pmx_settings[i]->default_on)
-			continue;
-
-		for (j = 0; j < ARRAY_SIZE(pmx_registers); j++) {
-
-			/* Make sure there is only one entry on the same bits */
-			if (modbits[j] & pmx_settings[i]->onmask[j].mask) {
-				BUG();
-				return -EUSERS;
-			}
-			modbits[j] |= pmx_settings[i]->onmask[j].mask;
-		}
-		update_registers(pmx_settings[i], true);
-	}
-	return 0;
-}
-
-#if (defined(CONFIG_DEBUG_FS) && defined(CONFIG_U300_DEBUG))
-static int pmx_show(struct seq_file *s, void *data)
-{
-	int i;
-	seq_printf(s, "-------------------------------------------------\n");
-	seq_printf(s, "SETTING     BOUND TO DEVICE               STATE\n");
-	seq_printf(s, "-------------------------------------------------\n");
-	mutex_lock(&pmx_mutex);
-	for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
-		/* Format pmx and device name nicely */
-		char cdp[33];
-		int chars;
-
-		chars = snprintf(&cdp[0], 17, "%s", pmx_settings[i]->name);
-		while (chars < 16) {
-			cdp[chars] = ' ';
-			chars++;
-		}
-		chars = snprintf(&cdp[16], 17, "%s", pmx_settings[i]->dev ?
-				dev_name(pmx_settings[i]->dev) : "N/A");
-		while (chars < 16) {
-			cdp[chars+16] = ' ';
-			chars++;
-		}
-		cdp[32] = '\0';
-
-		seq_printf(s,
-			"%s\t%s\n",
-			&cdp[0],
-			pmx_settings[i]->activated ?
-			"ACTIVATED" : "DEACTIVATED"
-			);
-
-	}
-	mutex_unlock(&pmx_mutex);
-	return 0;
-}
-
-static int pmx_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, pmx_show, NULL);
-}
-
-static const struct file_operations pmx_operations = {
-	.owner		= THIS_MODULE,
-	.open		= pmx_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
-
-static int __init init_pmx_read_debugfs(void)
-{
-	/* Expose a simple debugfs interface to view pmx settings */
-	(void) debugfs_create_file("padmux", S_IFREG | S_IRUGO,
-				   NULL, NULL,
-				   &pmx_operations);
-	return 0;
-}
-
-/*
- * This needs to come in after the core_initcall(),
- * because debugfs is not available until
- * the subsystems come up.
- */
-module_init(init_pmx_read_debugfs);
-#endif
-
-static int __init pmx_init(void)
-{
-	int ret;
-
-	ret = pmx_set_default();
-
-	if (IS_ERR_VALUE(ret))
-		pr_crit("padmux: default settings could not be set\n");
-
-	return 0;
-}
-
-/* Should be initialized before consumers */
-core_initcall(pmx_init);