forked from Minki/linux
bc71c0961c
This adds support for the U9540 variant of the U8500 series. This is an application processor without internal modem. This is the most basic part with ASIC ID, CPU-related fixes, IRQ list, register ranges, timer, UART, and L2 cache setup. This is based on a patch by Michel Jaouen which was rewritten to fit with the latest 3.3 kernel. ChangeLog v1->v2: deleted the irqs-db9540.h file since we expect to migrate to using Device Tree for getting the IRQs to devices. ChangeLog v2->v3: introduced a fixed virtual offset for the ROM as suggested by Arnd Bergmann. Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Sebastien Pasdeloup <sebastien.pasdeloup-nonst@stericsson.com> Signed-off-by: Michel Jaouen <michel.jaouen@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
136 lines
2.5 KiB
C
136 lines
2.5 KiB
C
/*
|
|
* Copyright (C) ST-Ericsson SA 2010
|
|
*
|
|
* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
|
|
* License terms: GNU General Public License (GPL), version 2
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "mop500-uib: " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/i2c.h>
|
|
|
|
#include <mach/hardware.h>
|
|
#include "board-mop500.h"
|
|
|
|
enum mop500_uib {
|
|
STUIB,
|
|
U8500UIB,
|
|
};
|
|
|
|
struct uib {
|
|
const char *name;
|
|
const char *option;
|
|
void (*init)(void);
|
|
};
|
|
|
|
static struct uib __initdata mop500_uibs[] = {
|
|
[STUIB] = {
|
|
.name = "ST-UIB",
|
|
.option = "stuib",
|
|
.init = mop500_stuib_init,
|
|
},
|
|
[U8500UIB] = {
|
|
.name = "U8500-UIB",
|
|
.option = "u8500uib",
|
|
.init = mop500_u8500uib_init,
|
|
},
|
|
};
|
|
|
|
static struct uib *mop500_uib;
|
|
|
|
static int __init mop500_uib_setup(char *str)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(mop500_uibs); i++) {
|
|
struct uib *uib = &mop500_uibs[i];
|
|
|
|
if (!strcmp(str, uib->option)) {
|
|
mop500_uib = uib;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i == ARRAY_SIZE(mop500_uibs))
|
|
pr_err("invalid uib= option (%s)\n", str);
|
|
|
|
return 1;
|
|
}
|
|
__setup("uib=", mop500_uib_setup);
|
|
|
|
/*
|
|
* The UIBs are detected after the I2C host controllers are registered, so
|
|
* i2c_register_board_info() can't be used.
|
|
*/
|
|
void mop500_uib_i2c_add(int busnum, struct i2c_board_info *info,
|
|
unsigned n)
|
|
{
|
|
struct i2c_adapter *adap;
|
|
struct i2c_client *client;
|
|
int i;
|
|
|
|
adap = i2c_get_adapter(busnum);
|
|
if (!adap) {
|
|
pr_err("failed to get adapter i2c%d\n", busnum);
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < n; i++) {
|
|
client = i2c_new_device(adap, &info[i]);
|
|
if (!client)
|
|
pr_err("failed to register %s to i2c%d\n",
|
|
info[i].type, busnum);
|
|
}
|
|
|
|
i2c_put_adapter(adap);
|
|
}
|
|
|
|
static void __init __mop500_uib_init(struct uib *uib, const char *why)
|
|
{
|
|
pr_info("%s (%s)\n", uib->name, why);
|
|
uib->init();
|
|
}
|
|
|
|
/*
|
|
* Detect the UIB attached based on the presence or absence of i2c devices.
|
|
*/
|
|
static int __init mop500_uib_init(void)
|
|
{
|
|
struct uib *uib = mop500_uib;
|
|
struct i2c_adapter *i2c0;
|
|
int ret;
|
|
|
|
if (!cpu_is_u8500_family())
|
|
return -ENODEV;
|
|
|
|
if (uib) {
|
|
__mop500_uib_init(uib, "from uib= boot argument");
|
|
return 0;
|
|
}
|
|
|
|
i2c0 = i2c_get_adapter(0);
|
|
if (!i2c0) {
|
|
__mop500_uib_init(&mop500_uibs[STUIB],
|
|
"fallback, could not get i2c0");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* U8500-UIB has the TC35893 at 0x44 on I2C0, the ST-UIB doesn't. */
|
|
ret = i2c_smbus_xfer(i2c0, 0x44, 0, I2C_SMBUS_WRITE, 0,
|
|
I2C_SMBUS_QUICK, NULL);
|
|
i2c_put_adapter(i2c0);
|
|
|
|
if (ret == 0)
|
|
uib = &mop500_uibs[U8500UIB];
|
|
else
|
|
uib = &mop500_uibs[STUIB];
|
|
|
|
__mop500_uib_init(uib, "detected");
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_init(mop500_uib_init);
|