Re: [PATCH] [POWERPC] CPM1: implement GPIO LIB API
From: Jochen Friedrich
Date: Wed Mar 26 2008 - 13:46:41 EST
Hi Scott,
>> diff --git a/arch/powerpc/platforms/8xx/Kconfig b/arch/powerpc/platforms/8xx/Kconfig
>> index 7fd224c..e12cbf0 100644
>> --- a/arch/powerpc/platforms/8xx/Kconfig
>> +++ b/arch/powerpc/platforms/8xx/Kconfig
>> @@ -4,6 +4,8 @@ config FADS
>> config CPM1
>> bool
>> select CPM
>> + select GENERIC_GPIO
>> + select GPIO_LIB
>
> Shouldn't this depend on the user enabling GPIO support? Some 8xx
> boards are very memory-constrained, so we don't want to be making the
> kernel even bigger than it already is unless it's actually needed.
Are you more comfortable with this?
Implement GPIO LIB API on CPM1 Freescale SoC.
Signed-off-by: Jochen Friedrich <jochen@xxxxxxxx>
---
arch/powerpc/platforms/8xx/Kconfig | 10 ++
arch/powerpc/sysdev/cpm1.c | 246 +++++++++++++++++++++++++++++++++++-
2 files changed, 255 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/platforms/8xx/Kconfig b/arch/powerpc/platforms/8xx/Kconfig
index 7fd224c..9d17425 100644
--- a/arch/powerpc/platforms/8xx/Kconfig
+++ b/arch/powerpc/platforms/8xx/Kconfig
@@ -109,6 +109,16 @@ config 8xx_COPYBACK
If in doubt, say Y here.
+config 8xx_GPIO
+ bool "GPIO API Support"
+ select GENERIC_GPIO
+ select HAVE_GPIO_LIB
+ help
+ Saying Y here will cause the ports on an MPC8xx processor to be used
+ with the GPIO API. If you say N here, the kernel needs less memory.
+
+ If in doubt, say Y here.
+
config 8xx_CPU6
bool "CPU6 Silicon Errata (860 Pre Rev. C)"
help
diff --git a/arch/powerpc/sysdev/cpm1.c b/arch/powerpc/sysdev/cpm1.c
index df8bd2b..6c97f3f 100644
--- a/arch/powerpc/sysdev/cpm1.c
+++ b/arch/powerpc/sysdev/cpm1.c
@@ -30,6 +30,7 @@
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/module.h>
+#include <linux/spinlock.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/8xx_immap.h>
@@ -42,6 +43,11 @@
#include <asm/fs_pd.h>
+#ifdef CONFIG_8xx_GPIO
+#include <linux/of_gpio.h>
+#include <asm/gpio.h>
+#endif
+
#define CPM_MAP_SIZE (0x4000)
#ifndef CONFIG_PPC_CPM_NEW_BINDING
@@ -403,7 +409,7 @@ struct cpm_ioport16 {
};
struct cpm_ioport32 {
- __be32 dir, par, sor;
+ __be32 dir, par, sor, dat;
};
static void cpm1_set_pin32(int port, int pin, int flags)
@@ -610,3 +616,241 @@ int cpm1_clk_setup(enum cpm_clk_target target, int clock, int mode)
return 0;
}
+
+/*
+ * GPIO LIB API implementation
+ */
+#ifdef CONFIG_8xx_GPIO
+
+struct cpm1_gpio16_chip {
+ struct of_mm_gpio_chip mm_gc;
+ spinlock_t lock;
+
+ /* shadowed data register to clear/set bits safely */
+ u16 cpdata;
+};
+
+static inline struct cpm1_gpio16_chip *
+to_cpm1_gpio16_chip(struct of_mm_gpio_chip *mm_gc)
+{
+ return container_of(mm_gc, struct cpm1_gpio16_chip, mm_gc);
+}
+
+static void cpm1_gpio16_save_regs(struct of_mm_gpio_chip *mm_gc)
+{
+ struct cpm1_gpio16_chip *cpm1_gc = to_cpm1_gpio16_chip(mm_gc);
+ struct cpm_ioport16 __iomem *iop = mm_gc->regs;
+
+ cpm1_gc->cpdata = in_be16(&iop->dat);
+}
+
+static int cpm1_gpio16_get(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct cpm_ioport16 __iomem *iop = mm_gc->regs;
+ u16 pin_mask;
+
+ pin_mask = 1 << (15 - gpio);
+
+ return !!(in_be16(&iop->dat) & pin_mask);
+}
+
+static void cpm1_gpio16_set(struct gpio_chip *gc, unsigned int gpio, int value)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct cpm1_gpio16_chip *cpm1_gc = to_cpm1_gpio16_chip(mm_gc);
+ struct cpm_ioport16 __iomem *iop = mm_gc->regs;
+ unsigned long flags;
+ u16 pin_mask = 1 << (15 - gpio);
+
+ spin_lock_irqsave(&cpm1_gc->lock, flags);
+
+ if (value)
+ cpm1_gc->cpdata |= pin_mask;
+ else
+ cpm1_gc->cpdata &= ~pin_mask;
+
+ out_be16(&iop->dat, cpm1_gc->cpdata);
+
+ spin_unlock_irqrestore(&cpm1_gc->lock, flags);
+}
+
+static int cpm1_gpio16_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct cpm_ioport16 __iomem *iop = mm_gc->regs;
+ u16 pin_mask;
+
+ pin_mask = 1 << (15 - gpio);
+
+ setbits16(&iop->dir, pin_mask);
+
+ cpm1_gpio16_set(gc, gpio, val);
+
+ return 0;
+}
+
+static int cpm1_gpio16_dir_in(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct cpm_ioport16 __iomem *iop = mm_gc->regs;
+ u16 pin_mask;
+
+ pin_mask = 1 << (15 - gpio);
+
+ clrbits16(&iop->dir, pin_mask);
+
+ return 0;
+}
+
+int cpm1_gpiochip_add16(struct device_node *np)
+{
+ struct cpm1_gpio16_chip *cpm1_gc;
+ struct of_mm_gpio_chip *mm_gc;
+ struct of_gpio_chip *of_gc;
+ struct gpio_chip *gc;
+
+ cpm1_gc = kzalloc(sizeof(*cpm1_gc), GFP_KERNEL);
+ if (!cpm1_gc)
+ return -ENOMEM;
+
+ spin_lock_init(&cpm1_gc->lock);
+
+ mm_gc = &cpm1_gc->mm_gc;
+ of_gc = &mm_gc->of_gc;
+ gc = &of_gc->gc;
+
+ mm_gc->save_regs = cpm1_gpio16_save_regs;
+ of_gc->gpio_cells = 1;
+ gc->ngpio = 16;
+ gc->direction_input = cpm1_gpio16_dir_in;
+ gc->direction_output = cpm1_gpio16_dir_out;
+ gc->get = cpm1_gpio16_get;
+ gc->set = cpm1_gpio16_set;
+
+ return of_mm_gpiochip_add(np, mm_gc);
+}
+
+struct cpm1_gpio32_chip {
+ struct of_mm_gpio_chip mm_gc;
+ spinlock_t lock;
+
+ /* shadowed data register to clear/set bits safely */
+ u32 cpdata;
+};
+
+static inline struct cpm1_gpio32_chip *
+to_cpm1_gpio32_chip(struct of_mm_gpio_chip *mm_gc)
+{
+ return container_of(mm_gc, struct cpm1_gpio32_chip, mm_gc);
+}
+
+static void cpm1_gpio32_save_regs(struct of_mm_gpio_chip *mm_gc)
+{
+ struct cpm1_gpio32_chip *cpm1_gc = to_cpm1_gpio32_chip(mm_gc);
+ struct cpm_ioport32 __iomem *iop = mm_gc->regs;
+
+ cpm1_gc->cpdata = in_be32(&iop->dat);
+}
+
+static int cpm1_gpio32_get(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct cpm_ioport32 __iomem *iop = mm_gc->regs;
+ u32 pin_mask;
+
+ pin_mask = 1 << (31 - gpio);
+
+ return !!(in_be32(&iop->dat) & pin_mask);
+}
+
+static void cpm1_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct cpm1_gpio32_chip *cpm1_gc = to_cpm1_gpio32_chip(mm_gc);
+ struct cpm_ioport32 __iomem *iop = mm_gc->regs;
+ unsigned long flags;
+ u32 pin_mask = 1 << (31 - gpio);
+
+ spin_lock_irqsave(&cpm1_gc->lock, flags);
+
+ if (value)
+ cpm1_gc->cpdata |= pin_mask;
+ else
+ cpm1_gc->cpdata &= ~pin_mask;
+
+ out_be32(&iop->dat, cpm1_gc->cpdata);
+
+ spin_unlock_irqrestore(&cpm1_gc->lock, flags);
+}
+
+static int cpm1_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct cpm_ioport32 __iomem *iop = mm_gc->regs;
+ u32 pin_mask;
+
+ pin_mask = 1 << (31 - gpio);
+
+ setbits32(&iop->dir, pin_mask);
+
+ cpm1_gpio32_set(gc, gpio, val);
+
+ return 0;
+}
+
+static int cpm1_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct cpm_ioport32 __iomem *iop = mm_gc->regs;
+ u32 pin_mask;
+
+ pin_mask = 1 << (31 - gpio);
+
+ clrbits32(&iop->dir, pin_mask);
+
+ return 0;
+}
+
+int cpm1_gpiochip_add32(struct device_node *np)
+{
+ struct cpm1_gpio32_chip *cpm1_gc;
+ struct of_mm_gpio_chip *mm_gc;
+ struct of_gpio_chip *of_gc;
+ struct gpio_chip *gc;
+
+ cpm1_gc = kzalloc(sizeof(*cpm1_gc), GFP_KERNEL);
+ if (!cpm1_gc)
+ return -ENOMEM;
+
+ spin_lock_init(&cpm1_gc->lock);
+
+ mm_gc = &cpm1_gc->mm_gc;
+ of_gc = &mm_gc->of_gc;
+ gc = &of_gc->gc;
+
+ mm_gc->save_regs = cpm1_gpio32_save_regs;
+ of_gc->gpio_cells = 1;
+ gc->ngpio = 32;
+ gc->direction_input = cpm1_gpio32_dir_in;
+ gc->direction_output = cpm1_gpio32_dir_out;
+ gc->get = cpm1_gpio32_get;
+ gc->set = cpm1_gpio32_set;
+
+ return of_mm_gpiochip_add(np, mm_gc);
+}
+
+static int cpm_init_par_io(void)
+{
+ struct device_node *np;
+
+ for_each_compatible_node(np, NULL, "fsl,cpm1-pario-bank16")
+ cpm1_gpiochip_add16(np);
+
+ for_each_compatible_node(np, NULL, "fsl,cpm1-pario-bank32")
+ cpm1_gpiochip_add32(np);
+ return 0;
+}
+arch_initcall(cpm_init_par_io);
+
+#endif /* CONFIG_8xx_GPIO */
--
1.5.4.4
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