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[POWERPC] cpm_uart: Allocate DPRAM memory for SMC ports on CPM2-based platforms.

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This patch allocates parameter RAM for SMC serial ports without relying on
previous initialisation by a boot loader or a wrapper layer.

SMC parameter RAM on CPM2-based platforms can be allocated anywhere in the
general-purpose areas of the dual-port RAM. The current code relies on the
boot loader to allocate a section of general-purpose CPM RAM and gets the
section address from the device tree.

This patch modifies the device tree address usage to reference the SMC
parameter RAM base pointer instead of a pre-allocated RAM section and
allocates memory from the CPM dual-port RAM when initialising the SMC port.
CPM1-based platforms are not affected.

Signed-off-by: Laurent Pinchart <laurentp@cse-semaphore.com>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Laurent Pinchart
2008-04-10 17:01:27 +02:00
committed by Kumar Gala
parent 1028d4f162
commit d464df2667
4 changed files with 78 additions and 10 deletions
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14
drivers/serial/cpm_uart/cpm_uart_cpm1.c
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@ -45,6 +45,8 @@
#include <linux/serial_core.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include "cpm_uart.h"
/**************************************************************/
@ -54,6 +56,18 @@ void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
{
cpm_command(port->command, cmd);
}
void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
struct device_node *np)
{
return of_iomap(np, 1);
}
void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
{
iounmap(pram);
}
#else
void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
{