linux-kernel - Re: [PATCH v2] reset-socfpga: Fix nr

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Message-ID: <1487238731.2377.2.camel@pengutronix.de>
Date:   Thu, 16 Feb 2017 10:52:11 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Rojhalat Ibrahim <imr@...chenk.de>
Cc:     Dinh Nguyen <dinguyen@...nsource.altera.com>,
        linux-fpga@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] reset-socfpga: Fix nr_resets property

On Wed, 2017-02-15 at 19:10 +0100, Rojhalat Ibrahim wrote:
> The SoC-FPGA reset controller driver defines NR_BANKS as 4 and uses that define
> for two unrelated purposes. It is used
> 1. as an increment for reset line banks which are 32-bit registers with 4-byte
> aligned addresses.
> 2. as the total number of reset line banks which together with the number of
> resets per bank (32) limits the total number of useable resets to 128 and the
> highest useable reset ID to 127.
> 
> This is clearly wrong as there are resets with higher IDs than 127 defined in
> include/dt-bindings/reset/altr,rst-mgr.h and altr,rst-mgr-a10.h.
> 
> The patch introduces a new define BANK_INCREMENT for calculating the register
> addresses as before and increases NR_BANKS to 8 for useable reset IDs up to 255.
> 
> Signed-off-by: Rojhalat Ibrahim <imr@...chenk.de>
> ---
> v2: change NR_BANKS to 8

Applied, thank you.

regards
Philipp

> 
>  reset-socfpga.c |   13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/reset/reset-socfpga.c b/drivers/reset/reset-socfpga.c
> index 43e4a9f..07224c0 100644
> --- a/drivers/reset/reset-socfpga.c
> +++ b/drivers/reset/reset-socfpga.c
> @@ -25,7 +25,8 @@
>  #include <linux/spinlock.h>
>  #include <linux/types.h>
>  
> -#define NR_BANKS		4
> +#define BANK_INCREMENT		4
> +#define NR_BANKS		8
>  
>  struct socfpga_reset_data {
>  	spinlock_t			lock;
> @@ -46,8 +47,8 @@ static int socfpga_reset_assert(struct reset_controller_dev *rcdev,
>  
>  	spin_lock_irqsave(&data->lock, flags);
>  
> -	reg = readl(data->membase + (bank * NR_BANKS));
> -	writel(reg | BIT(offset), data->membase + (bank * NR_BANKS));
> +	reg = readl(data->membase + (bank * BANK_INCREMENT));
> +	writel(reg | BIT(offset), data->membase + (bank * BANK_INCREMENT));
>  	spin_unlock_irqrestore(&data->lock, flags);
>  
>  	return 0;
> @@ -67,8 +68,8 @@ static int socfpga_reset_deassert(struct reset_controller_dev *rcdev,
>  
>  	spin_lock_irqsave(&data->lock, flags);
>  
> -	reg = readl(data->membase + (bank * NR_BANKS));
> -	writel(reg & ~BIT(offset), data->membase + (bank * NR_BANKS));
> +	reg = readl(data->membase + (bank * BANK_INCREMENT));
> +	writel(reg & ~BIT(offset), data->membase + (bank * BANK_INCREMENT));
>  
>  	spin_unlock_irqrestore(&data->lock, flags);
>  
> @@ -84,7 +85,7 @@ static int socfpga_reset_status(struct reset_controller_dev *rcdev,
>  	int offset = id % BITS_PER_LONG;
>  	u32 reg;
>  
> -	reg = readl(data->membase + (bank * NR_BANKS));
> +	reg = readl(data->membase + (bank * BANK_INCREMENT));
>  
>  	return !(reg & BIT(offset));
>  }
> 
> --
> 2.10.2
> 
>