mirror of
https://github.com/torvalds/linux.git
synced 2024-12-24 11:51:27 +00:00
88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
/*
|
|
* External Memory Interface
|
|
*
|
|
* Copyright (C) 2011 Texas Instruments Incorporated
|
|
* Author: Mark Salter <msalter@redhat.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/io.h>
|
|
#include <asm/soc.h>
|
|
#include <asm/dscr.h>
|
|
|
|
#define NUM_EMIFA_CHIP_ENABLES 4
|
|
|
|
struct emifa_regs {
|
|
u32 midr;
|
|
u32 stat;
|
|
u32 reserved1[6];
|
|
u32 bprio;
|
|
u32 reserved2[23];
|
|
u32 cecfg[NUM_EMIFA_CHIP_ENABLES];
|
|
u32 reserved3[4];
|
|
u32 awcc;
|
|
u32 reserved4[7];
|
|
u32 intraw;
|
|
u32 intmsk;
|
|
u32 intmskset;
|
|
u32 intmskclr;
|
|
};
|
|
|
|
static struct of_device_id emifa_match[] __initdata = {
|
|
{ .compatible = "ti,c64x+emifa" },
|
|
{}
|
|
};
|
|
|
|
/*
|
|
* Parse device tree for existence of an EMIF (External Memory Interface)
|
|
* and initialize it if found.
|
|
*/
|
|
static int __init c6x_emifa_init(void)
|
|
{
|
|
struct emifa_regs __iomem *regs;
|
|
struct device_node *node;
|
|
const __be32 *p;
|
|
u32 val;
|
|
int i, len, err;
|
|
|
|
node = of_find_matching_node(NULL, emifa_match);
|
|
if (!node)
|
|
return 0;
|
|
|
|
regs = of_iomap(node, 0);
|
|
if (!regs)
|
|
return 0;
|
|
|
|
/* look for a dscr-based enable for emifa pin buffers */
|
|
err = of_property_read_u32_array(node, "ti,dscr-dev-enable", &val, 1);
|
|
if (!err)
|
|
dscr_set_devstate(val, DSCR_DEVSTATE_ENABLED);
|
|
|
|
/* set up the chip enables */
|
|
p = of_get_property(node, "ti,emifa-ce-config", &len);
|
|
if (p) {
|
|
len /= sizeof(u32);
|
|
if (len > NUM_EMIFA_CHIP_ENABLES)
|
|
len = NUM_EMIFA_CHIP_ENABLES;
|
|
for (i = 0; i <= len; i++)
|
|
soc_writel(be32_to_cpup(&p[i]), ®s->cecfg[i]);
|
|
}
|
|
|
|
err = of_property_read_u32_array(node, "ti,emifa-burst-priority", &val, 1);
|
|
if (!err)
|
|
soc_writel(val, ®s->bprio);
|
|
|
|
err = of_property_read_u32_array(node, "ti,emifa-async-wait-control", &val, 1);
|
|
if (!err)
|
|
soc_writel(val, ®s->awcc);
|
|
|
|
iounmap(regs);
|
|
of_node_put(node);
|
|
return 0;
|
|
}
|
|
pure_initcall(c6x_emifa_init);
|