mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 08:57:58 +00:00
afbf88993c
Minimal platform support to boot linux from SD. Supported devices/hw limited to external MMC/SD slot, GPIO, I2C and minimal PRCMU. Signed-off-by: John Rigby <john.rigby@linaro.org> CC: Albert Aribaud <albert.aribaud@free.fr>
165 lines
4.3 KiB
C
165 lines
4.3 KiB
C
/*
|
|
* Copyright (C) 2009 ST-Ericsson SA
|
|
*
|
|
* Adapted from the Linux version:
|
|
* Author: Kumar Sanghvi <kumar.sanghvi@stericsson.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* NOTE: This currently does not support the I2C workaround access method.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <config.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/hardware.h>
|
|
#include <asm/types.h>
|
|
#include <asm/io.h>
|
|
#include <asm/errno.h>
|
|
|
|
#include "prcmu-fw.h"
|
|
|
|
/* CPU mailbox registers */
|
|
#define PRCM_MBOX_CPU_VAL (U8500_PRCMU_BASE + 0x0fc)
|
|
#define PRCM_MBOX_CPU_SET (U8500_PRCMU_BASE + 0x100)
|
|
#define PRCM_MBOX_CPU_CLR (U8500_PRCMU_BASE + 0x104)
|
|
|
|
static int prcmu_is_ready(void)
|
|
{
|
|
int ready = readb(PRCM_XP70_CUR_PWR_STATE) == AP_EXECUTE;
|
|
if (!ready)
|
|
printf("PRCMU firmware not ready\n");
|
|
return ready;
|
|
}
|
|
|
|
static int _wait_for_req_complete(int num)
|
|
{
|
|
int timeout = 1000;
|
|
|
|
/* checking any already on-going transaction */
|
|
while ((readl(PRCM_MBOX_CPU_VAL) & (1 << num)) && timeout--)
|
|
;
|
|
|
|
timeout = 1000;
|
|
|
|
/* Set an interrupt to XP70 */
|
|
writel(1 << num, PRCM_MBOX_CPU_SET);
|
|
|
|
while ((readl(PRCM_MBOX_CPU_VAL) & (1 << num)) && timeout--)
|
|
;
|
|
|
|
if (!timeout) {
|
|
printf("PRCMU operation timed out\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* prcmu_i2c_read - PRCMU - 4500 communication using PRCMU I2C
|
|
* @reg: - db8500 register bank to be accessed
|
|
* @slave: - db8500 register to be accessed
|
|
* Returns: ACK_MB5 value containing the status
|
|
*/
|
|
int prcmu_i2c_read(u8 reg, u16 slave)
|
|
{
|
|
uint8_t i2c_status;
|
|
uint8_t i2c_val;
|
|
|
|
if (!prcmu_is_ready())
|
|
return -1;
|
|
|
|
debug("\nprcmu_4500_i2c_read:bank=%x;reg=%x;\n",
|
|
reg, slave);
|
|
|
|
/* prepare the data for mailbox 5 */
|
|
writeb((reg << 1) | I2CREAD, PRCM_REQ_MB5_I2COPTYPE_REG);
|
|
writeb((1 << 3) | 0x0, PRCM_REQ_MB5_BIT_FIELDS);
|
|
writeb(slave, PRCM_REQ_MB5_I2CSLAVE);
|
|
writeb(0, PRCM_REQ_MB5_I2CVAL);
|
|
|
|
_wait_for_req_complete(REQ_MB5);
|
|
|
|
/* retrieve values */
|
|
debug("ack-mb5:transfer status = %x\n",
|
|
readb(PRCM_ACK_MB5_STATUS));
|
|
debug("ack-mb5:reg bank = %x\n", readb(PRCM_ACK_MB5) >> 1);
|
|
debug("ack-mb5:slave_add = %x\n",
|
|
readb(PRCM_ACK_MB5_SLAVE));
|
|
debug("ack-mb5:reg_val = %d\n", readb(PRCM_ACK_MB5_VAL));
|
|
|
|
i2c_status = readb(PRCM_ACK_MB5_STATUS);
|
|
i2c_val = readb(PRCM_ACK_MB5_VAL);
|
|
|
|
if (i2c_status == I2C_RD_OK)
|
|
return i2c_val;
|
|
else {
|
|
|
|
printf("prcmu_i2c_read:read return status= %d\n",
|
|
i2c_status);
|
|
return -1;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* prcmu_i2c_write - PRCMU-db8500 communication using PRCMU I2C
|
|
* @reg: - db8500 register bank to be accessed
|
|
* @slave: - db800 register to be written to
|
|
* @reg_data: - the data to write
|
|
* Returns: ACK_MB5 value containing the status
|
|
*/
|
|
int prcmu_i2c_write(u8 reg, u16 slave, u8 reg_data)
|
|
{
|
|
uint8_t i2c_status;
|
|
|
|
if (!prcmu_is_ready())
|
|
return -1;
|
|
|
|
debug("\nprcmu_4500_i2c_write:bank=%x;reg=%x;\n",
|
|
reg, slave);
|
|
|
|
/* prepare the data for mailbox 5 */
|
|
writeb((reg << 1) | I2CWRITE, PRCM_REQ_MB5_I2COPTYPE_REG);
|
|
writeb((1 << 3) | 0x0, PRCM_REQ_MB5_BIT_FIELDS);
|
|
writeb(slave, PRCM_REQ_MB5_I2CSLAVE);
|
|
writeb(reg_data, PRCM_REQ_MB5_I2CVAL);
|
|
|
|
debug("\ncpu_is_u8500v11\n");
|
|
_wait_for_req_complete(REQ_MB5);
|
|
|
|
/* retrieve values */
|
|
debug("ack-mb5:transfer status = %x\n",
|
|
readb(PRCM_ACK_MB5_STATUS));
|
|
debug("ack-mb5:reg bank = %x\n", readb(PRCM_ACK_MB5) >> 1);
|
|
debug("ack-mb5:slave_add = %x\n",
|
|
readb(PRCM_ACK_MB5_SLAVE));
|
|
debug("ack-mb5:reg_val = %d\n", readb(PRCM_ACK_MB5_VAL));
|
|
|
|
i2c_status = readb(PRCM_ACK_MB5_STATUS);
|
|
debug("\ni2c_status = %x\n", i2c_status);
|
|
if (i2c_status == I2C_WR_OK)
|
|
return 0;
|
|
else {
|
|
printf("ape-i2c: i2c_status : 0x%x\n", i2c_status);
|
|
return -1;
|
|
}
|
|
}
|