mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-25 12:33:41 +00:00
106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
//
|
||
|
|
// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
|
||
|
|
// Author: Vignesh Raghavendra <vigneshr@ti.com>
|
||
|
|
|
||
|
|
#include <common.h>
|
||
|
|
#include <asm/io.h>
|
||
|
|
#include <dm.h>
|
||
|
|
#include <regmap.h>
|
||
|
|
#include <syscon.h>
|
||
|
|
|
||
|
|
#define FSS_SYSC_REG 0x4
|
||
|
|
|
||
|
|
#define HYPERBUS_CALIB_COUNT 25
|
||
|
|
|
||
|
|
struct am654_hbmc_priv {
|
||
|
|
void __iomem *mmiobase;
|
||
|
|
bool calibrated;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* Calibrate by looking for "QRY" string within the CFI space */
|
||
|
|
static int am654_hyperbus_calibrate(struct udevice *dev)
|
||
|
|
{
|
||
|
|
struct am654_hbmc_priv *priv = dev_get_priv(dev);
|
||
|
|
int count = HYPERBUS_CALIB_COUNT;
|
||
|
|
int pass_count = 0;
|
||
|
|
u16 qry[3];
|
||
|
|
|
||
|
|
if (priv->calibrated)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
writew(0xF0, priv->mmiobase);
|
||
|
|
writew(0x98, priv->mmiobase + 0xaa);
|
||
|
|
|
||
|
|
while (count--) {
|
||
|
|
qry[0] = readw(priv->mmiobase + 0x20);
|
||
|
|
qry[1] = readw(priv->mmiobase + 0x22);
|
||
|
|
qry[2] = readw(priv->mmiobase + 0x24);
|
||
|
|
|
||
|
|
if (qry[0] == 'Q' && qry[1] == 'R' && qry[2] == 'Y')
|
||
|
|
pass_count++;
|
||
|
|
else
|
||
|
|
pass_count = 0;
|
||
|
|
if (pass_count == 5)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
writew(0xF0, priv->mmiobase);
|
||
|
|
writew(0xFF, priv->mmiobase);
|
||
|
|
|
||
|
|
return pass_count == 5;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int am654_select_hbmc(struct udevice *dev)
|
||
|
|
{
|
||
|
|
struct regmap *regmap = syscon_get_regmap(dev_get_parent(dev));
|
||
|
|
|
||
|
|
return regmap_update_bits(regmap, FSS_SYSC_REG, 0x2, 0x2);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int am654_hbmc_bind(struct udevice *dev)
|
||
|
|
{
|
||
|
|
return dm_scan_fdt_dev(dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int am654_hbmc_probe(struct udevice *dev)
|
||
|
|
{
|
||
|
|
struct am654_hbmc_priv *priv = dev_get_priv(dev);
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
priv->mmiobase = devfdt_remap_addr_index(dev, 1);
|
||
|
|
if (dev_read_bool(dev, "mux-controls")) {
|
||
|
|
ret = am654_select_hbmc(dev);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(dev, "Failed to select HBMC mux\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!priv->calibrated) {
|
||
|
|
ret = am654_hyperbus_calibrate(dev);
|
||
|
|
if (!ret) {
|
||
|
|
dev_err(dev, "Calibration Failed\n");
|
||
|
|
return -EIO;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
priv->calibrated = true;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct udevice_id am654_hbmc_dt_ids[] = {
|
||
|
|
{
|
||
|
|
.compatible = "ti,am654-hbmc",
|
||
|
|
},
|
||
|
|
{ /* end of table */ }
|
||
|
|
};
|
||
|
|
|
||
|
|
U_BOOT_DRIVER(hbmc_am654) = {
|
||
|
|
.name = "hbmc-am654",
|
||
|
|
.id = UCLASS_MTD,
|
||
|
|
.of_match = am654_hbmc_dt_ids,
|
||
|
|
.probe = am654_hbmc_probe,
|
||
|
|
.bind = am654_hbmc_bind,
|
||
|
|
.priv_auto_alloc_size = sizeof(struct am654_hbmc_priv),
|
||
|
|
};
|