linux-kernel - Re: [PATCH] tty: serial: men_z135_uart.c: use mcb memory region size instead of hardcoded one

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Date:	Wed, 07 Oct 2015 11:26:30 +0200
From:	Johannes Thumshirn <jthumshirn@...e.de>
To:	Andreas Werner <andy@...nerandy.de>
Cc:	gregkh@...uxfoundation.org, jslaby@...e.com,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	morbidrsa@...il.com
Subject: Re: [PATCH] tty: serial: men_z135_uart.c: use mcb memory region size instead of hardcoded one

Andreas Werner <andy@...nerandy.de> writes:

> There is no need to hardcode the MEN_Z135_MEM_SIZE. The MCB subsystem
> already knowns the size which is located in the chameleon table.
> MCB parse the chameleon table to get the resources of each IP and provide
> the mcb_request_mem function to get those resources.
>
> Use mcb_request_mem to get the resources. This function also takes care of
> the memory region naming allocated by the driver for each of the instances.
>
> Signed-off-by: Andreas Werner <andy@...nerandy.de>

Acked-by: Johannes Thumshirn <jthumshirn@...e.de>

> ---
>  drivers/tty/serial/men_z135_uart.c | 23 +++++++++++++++--------
>  1 file changed, 15 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/tty/serial/men_z135_uart.c b/drivers/tty/serial/men_z135_uart.c
> index b90e7b3..3141aa2 100644
> --- a/drivers/tty/serial/men_z135_uart.c
> +++ b/drivers/tty/serial/men_z135_uart.c
> @@ -35,8 +35,6 @@
>  #define MEN_Z135_BAUD_REG		0x810
>  #define MEN_Z135_TIMEOUT		0x814
>  
> -#define MEN_Z135_MEM_SIZE		0x818
> -
>  #define IRQ_ID(x) ((x) & 0x1f)
>  
>  #define MEN_Z135_IER_RXCIEN BIT(0)		/* RX Space IRQ */
> @@ -124,6 +122,7 @@ MODULE_PARM_DESC(rx_timeout, "RX timeout. "
>  struct men_z135_port {
>  	struct uart_port port;
>  	struct mcb_device *mdev;
> +	struct resource *mem;
>  	unsigned char *rxbuf;
>  	u32 stat_reg;
>  	spinlock_t lock;
> @@ -734,22 +733,30 @@ static const char *men_z135_type(struct uart_port *port)
>  
>  static void men_z135_release_port(struct uart_port *port)
>  {
> +	struct men_z135_port *uart = to_men_z135(port);
> +
>  	iounmap(port->membase);
>  	port->membase = NULL;
>  
> -	release_mem_region(port->mapbase, MEN_Z135_MEM_SIZE);
> +	mcb_release_mem(uart->mem);
>  }
>  
>  static int men_z135_request_port(struct uart_port *port)
>  {
> -	int size = MEN_Z135_MEM_SIZE;
> +	struct men_z135_port *uart = to_men_z135(port);
> +	struct mcb_device *mdev = uart->mdev;
> +	struct resource *mem;
> +
> +	mem = mcb_request_mem(uart->mdev, dev_name(&mdev->dev));
> +	if (IS_ERR(mem))
> +		return PTR_ERR(mem);
>  
> -	if (!request_mem_region(port->mapbase, size, "men_z135_port"))
> -		return -EBUSY;
> +	port->mapbase = mem->start;
> +	uart->mem = mem;
>  
> -	port->membase = ioremap(port->mapbase, MEN_Z135_MEM_SIZE);
> +	port->membase = ioremap(mem->start, resource_size(mem));
>  	if (port->membase == NULL) {
> -		release_mem_region(port->mapbase, MEN_Z135_MEM_SIZE);
> +		mcb_release_mem(mem);
>  		return -ENOMEM;
>  	}
--
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