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author | Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com> | 2008-02-15 08:41:06 +0100 |
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committer | Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com> | 2008-03-31 08:17:01 +0200 |
commit | 724ce5ee15ff4c4f3035110b683b990a3b33c832 (patch) | |
tree | 7b07d25bf64d2e6dad4495c847d1b24d9d5dca43 /arch/arm/mach-ns9xxx/gpio-ns9360.c | |
parent | 3a581349b961f225893103a0fbbd065a831c5184 (diff) | |
download | kernel_samsung_smdk4412-724ce5ee15ff4c4f3035110b683b990a3b33c832.zip kernel_samsung_smdk4412-724ce5ee15ff4c4f3035110b683b990a3b33c832.tar.gz kernel_samsung_smdk4412-724ce5ee15ff4c4f3035110b683b990a3b33c832.tar.bz2 |
ns9xxx: prepare for adding support for Digi ns921x processors
The hardware team changed some things that were taken as being common to
all ns9xxx processors up to now.
This patch addresses:
- irqs: s/IRQ_/IRQ_NS9360_/
- system module registers: some registers are still general, their
definition lives now in include/asm-arm/arch-ns9xxx/regs-sys-common.h.
The ns9360 specific ones are in .../regs-sys-ns9360.h
As a result ns9360_systemclock cannot be static inline any more as its
definition needs regs-sys-ns9360.h. This becomes a real problem when
adding support for ns9215 as this will need regs-sys-ns9215.h and
including both files will not work. For the same reason
ns9360_reset() is now non-inline and gpio functions live in their own
file.
- register mapping: s/ns9xxx_map_io/ns9360_map_io/
- timer registers: move time.c to time-ns9360.c;
s/ns9xxx_timer/ns9360_timer/
Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
Diffstat (limited to 'arch/arm/mach-ns9xxx/gpio-ns9360.c')
-rw-r--r-- | arch/arm/mach-ns9xxx/gpio-ns9360.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/arch/arm/mach-ns9xxx/gpio-ns9360.c b/arch/arm/mach-ns9xxx/gpio-ns9360.c new file mode 100644 index 0000000..cabfb87 --- /dev/null +++ b/arch/arm/mach-ns9xxx/gpio-ns9360.c @@ -0,0 +1,118 @@ +/* + * arch/arm/mach-ns9xxx/gpio-ns9360.c + * + * Copyright (C) 2006,2007 by Digi International Inc. + * 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 as published by + * the Free Software Foundation. + */ +#include <linux/bug.h> +#include <linux/errno.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> + +#include <asm/arch-ns9xxx/regs-bbu.h> +#include <asm/arch-ns9xxx/processor-ns9360.h> + +#include "gpio-ns9360.h" + +static inline int ns9360_valid_gpio(unsigned gpio) +{ + return gpio <= 72; +} + +static inline void __iomem *ns9360_gpio_get_gconfaddr(unsigned gpio) +{ + if (gpio < 56) + return BBU_GCONFb1(gpio / 8); + else + /* + * this could be optimised away on + * ns9750 only builds, but it isn't ... + */ + return BBU_GCONFb2((gpio - 56) / 8); +} + +static inline void __iomem *ns9360_gpio_get_gctrladdr(unsigned gpio) +{ + if (gpio < 32) + return BBU_GCTRL1; + else if (gpio < 64) + return BBU_GCTRL2; + else + /* this could be optimised away on ns9750 only builds */ + return BBU_GCTRL3; +} + +static inline void __iomem *ns9360_gpio_get_gstataddr(unsigned gpio) +{ + if (gpio < 32) + return BBU_GSTAT1; + else if (gpio < 64) + return BBU_GSTAT2; + else + /* this could be optimised away on ns9750 only builds */ + return BBU_GSTAT3; +} + +/* + * each gpio can serve for 4 different purposes [0..3]. These are called + * "functions" and passed in the parameter func. Functions 0-2 are always some + * special things, function 3 is GPIO. If func == 3 dir specifies input or + * output, and with inv you can enable an inverter (independent of func). + */ +int __ns9360_gpio_configure(unsigned gpio, int dir, int inv, int func) +{ + void __iomem *conf = ns9360_gpio_get_gconfaddr(gpio); + u32 confval; + + confval = __raw_readl(conf); + REGSETIM_IDX(confval, BBU_GCONFx, DIR, gpio & 7, dir); + REGSETIM_IDX(confval, BBU_GCONFx, INV, gpio & 7, inv); + REGSETIM_IDX(confval, BBU_GCONFx, FUNC, gpio & 7, func); + __raw_writel(confval, conf); + + return 0; +} + +int ns9360_gpio_configure(unsigned gpio, int inv, int func) +{ + if (likely(ns9360_valid_gpio(gpio))) { + if (func == 3) { + printk(KERN_WARNING "use gpio_direction_input " + "or gpio_direction_output\n"); + return -EINVAL; + } else + return __ns9360_gpio_configure(gpio, 0, inv, func); + } else + return -EINVAL; +} +EXPORT_SYMBOL(ns9360_gpio_configure); + +int ns9360_gpio_get_value(unsigned gpio) +{ + void __iomem *stat = ns9360_gpio_get_gstataddr(gpio); + int ret; + + ret = 1 & (__raw_readl(stat) >> (gpio & 31)); + + return ret; +} + +void ns9360_gpio_set_value(unsigned gpio, int value) +{ + void __iomem *ctrl = ns9360_gpio_get_gctrladdr(gpio); + u32 ctrlval; + + ctrlval = __raw_readl(ctrl); + + if (value) + ctrlval |= 1 << (gpio & 31); + else + ctrlval &= ~(1 << (gpio & 31)); + + __raw_writel(ctrlval, ctrl); +} |