[PATCHv2 1/2] [POWERPC] CPM2: Implement GPIO LIB API on CPM2 Freescale SoC.
Laurent Pinchart
laurentp at cse-semaphore.com
Fri Jun 13 22:46:20 EST 2008
On Friday 18 April 2008 19:16, Jochen Friedrich wrote:
> Based on earlier work by Laurent Pinchart.
>
> This patch implement GPIO LIB support for the CPM2 GPIOs.
>
> Signed-off-by: Jochen Friedrich <jochen at scram.de>
> Cc: Laurent Pinchart <laurentp at cse-semaphore.com>
Signed-off-by: Laurent Pinchart <laurentp at cse-semaphore.com>
Is there any showstopper or can this one be applied to powerpc-next ?
> ---
> arch/powerpc/platforms/Kconfig | 2 +
> arch/powerpc/sysdev/cpm2.c | 11 ++++
> arch/powerpc/sysdev/cpm_common.c | 123 ++++++++++++++++++++++++++++++++++++++
> include/asm-powerpc/cpm.h | 3 +
> 4 files changed, 139 insertions(+), 0 deletions(-)
>
> Changes from version 1:
>
> - conditionally include #include <linux/of_gpio.h> in cpm_common.c, so it compiles
> when GPIO on 8xx is not selected.
>
> diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
> index f6eecd1..78911f6 100644
> --- a/arch/powerpc/platforms/Kconfig
> +++ b/arch/powerpc/platforms/Kconfig
> @@ -283,6 +283,8 @@ config CPM2
> depends on MPC85xx || 8260
> select CPM
> select PPC_LIB_RHEAP
> + select GENERIC_GPIO
> + select HAVE_GPIO_LIB
> help
> The CPM2 (Communications Processor Module) is a coprocessor on
> embedded CPUs made by Freescale. Selecting this option means that
> diff --git a/arch/powerpc/sysdev/cpm2.c b/arch/powerpc/sysdev/cpm2.c
> index 5a6c5df..9311778 100644
> --- a/arch/powerpc/sysdev/cpm2.c
> +++ b/arch/powerpc/sysdev/cpm2.c
> @@ -377,3 +377,14 @@ void cpm2_set_pin(int port, int pin, int flags)
> else
> clrbits32(&iop[port].odr, pin);
> }
> +
> +static int cpm_init_par_io(void)
> +{
> + struct device_node *np;
> +
> + for_each_compatible_node(np, NULL, "fsl,cpm2-pario-bank")
> + cpm2_gpiochip_add32(np);
> + return 0;
> +}
> +arch_initcall(cpm_init_par_io);
> +
> diff --git a/arch/powerpc/sysdev/cpm_common.c b/arch/powerpc/sysdev/cpm_common.c
> index cb7df2d..43bac6e 100644
> --- a/arch/powerpc/sysdev/cpm_common.c
> +++ b/arch/powerpc/sysdev/cpm_common.c
> @@ -19,6 +19,8 @@
>
> #include <linux/init.h>
> #include <linux/of_device.h>
> +#include <linux/spinlock.h>
> +#include <linux/of.h>
>
> #include <asm/udbg.h>
> #include <asm/io.h>
> @@ -28,6 +30,10 @@
>
> #include <mm/mmu_decl.h>
>
> +#if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO)
> +#include <linux/of_gpio.h>
> +#endif
> +
> #ifdef CONFIG_PPC_EARLY_DEBUG_CPM
> static u32 __iomem *cpm_udbg_txdesc =
> (u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;
> @@ -198,3 +204,120 @@ dma_addr_t cpm_muram_dma(void __iomem *addr)
> return muram_pbase + ((u8 __iomem *)addr - muram_vbase);
> }
> EXPORT_SYMBOL(cpm_muram_dma);
> +
> +#if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO)
> +
> +struct cpm2_ioports {
> + u32 dir, par, sor, odr, dat;
> + u32 res[3];
> +};
> +
> +struct cpm2_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 cpm2_gpio32_chip *
> +to_cpm2_gpio32_chip(struct of_mm_gpio_chip *mm_gc)
> +{
> + return container_of(mm_gc, struct cpm2_gpio32_chip, mm_gc);
> +}
> +
> +static void cpm2_gpio32_save_regs(struct of_mm_gpio_chip *mm_gc)
> +{
> + struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
> + struct cpm2_ioports __iomem *iop = mm_gc->regs;
> +
> + cpm2_gc->cpdata = in_be32(&iop->dat);
> +}
> +
> +static int cpm2_gpio32_get(struct gpio_chip *gc, unsigned int gpio)
> +{
> + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
> + struct cpm2_ioports __iomem *iop = mm_gc->regs;
> + u32 pin_mask;
> +
> + pin_mask = 1 << (31 - gpio);
> +
> + return !!(in_be32(&iop->dat) & pin_mask);
> +}
> +
> +static void cpm2_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 cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
> + struct cpm2_ioports __iomem *iop = mm_gc->regs;
> + unsigned long flags;
> + u32 pin_mask = 1 << (31 - gpio);
> +
> + spin_lock_irqsave(&cpm2_gc->lock, flags);
> +
> + if (value)
> + cpm2_gc->cpdata |= pin_mask;
> + else
> + cpm2_gc->cpdata &= ~pin_mask;
> +
> + out_be32(&iop->dat, cpm2_gc->cpdata);
> +
> + spin_unlock_irqrestore(&cpm2_gc->lock, flags);
> +}
> +
> +static int cpm2_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 cpm2_ioports __iomem *iop = mm_gc->regs;
> + u32 pin_mask;
> +
> + pin_mask = 1 << (31 - gpio);
> +
> + setbits32(&iop->dir, pin_mask);
> +
> + cpm2_gpio32_set(gc, gpio, val);
> +
> + return 0;
> +}
> +
> +static int cpm2_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio)
> +{
> + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
> + struct cpm2_ioports __iomem *iop = mm_gc->regs;
> + u32 pin_mask;
> +
> + pin_mask = 1 << (31 - gpio);
> +
> + clrbits32(&iop->dir, pin_mask);
> +
> + return 0;
> +}
> +
> +int cpm2_gpiochip_add32(struct device_node *np)
> +{
> + struct cpm2_gpio32_chip *cpm2_gc;
> + struct of_mm_gpio_chip *mm_gc;
> + struct of_gpio_chip *of_gc;
> + struct gpio_chip *gc;
> +
> + cpm2_gc = kzalloc(sizeof(*cpm2_gc), GFP_KERNEL);
> + if (!cpm2_gc)
> + return -ENOMEM;
> +
> + spin_lock_init(&cpm2_gc->lock);
> +
> + mm_gc = &cpm2_gc->mm_gc;
> + of_gc = &mm_gc->of_gc;
> + gc = &of_gc->gc;
> +
> + mm_gc->save_regs = cpm2_gpio32_save_regs;
> + of_gc->gpio_cells = 1;
> + gc->ngpio = 32;
> + gc->direction_input = cpm2_gpio32_dir_in;
> + gc->direction_output = cpm2_gpio32_dir_out;
> + gc->get = cpm2_gpio32_get;
> + gc->set = cpm2_gpio32_set;
> +
> + return of_mm_gpiochip_add(np, mm_gc);
> +}
> +#endif /* CONFIG_CPM2 || CONFIG_8xx_GPIO */
> diff --git a/include/asm-powerpc/cpm.h b/include/asm-powerpc/cpm.h
> index ede38ff..23b72ee 100644
> --- a/include/asm-powerpc/cpm.h
> +++ b/include/asm-powerpc/cpm.h
> @@ -3,6 +3,7 @@
>
> #include <linux/compiler.h>
> #include <linux/types.h>
> +#include <linux/of.h>
>
> /* Opcodes common to CPM1 and CPM2
> */
> @@ -99,4 +100,6 @@ void __iomem *cpm_muram_addr(unsigned long offset);
> dma_addr_t cpm_muram_dma(void __iomem *addr);
> int cpm_command(u32 command, u8 opcode);
>
> +int cpm2_gpiochip_add32(struct device_node *np);
> +
> #endif
--
Laurent Pinchart
CSE Semaphore Belgium
Chaussee de Bruxelles, 732A
B-1410 Waterloo
Belgium
T +32 (2) 387 42 59
F +32 (2) 387 42 75
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