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# IBM_PROLOG_BEGIN_TAG
# This is an automatically generated prolog.
#
# $Source: src/occ/gpe/apss_altitude.pS $
#
# OpenPOWER OnChipController Project
#
# Contributors Listed Below - COPYRIGHT 2011,2014
# [+] Google Inc.
# [+] International Business Machines Corp.
#
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied. See the License for the specific language governing
# permissions and limitations under the License.
#
# IBM_PROLOG_END_TAG
//////////////////////////////////////////////////////////////////////
// Includes
//////////////////////////////////////////////////////////////////////
.nolist
#include "pgp.h"
#include "pgas.h"
.list
//////////////////////////////////////////////////////////////////////
// Define Address Space
//////////////////////////////////////////////////////////////////////
.oci
//////////////////////////////////////////////////////////////////////
// Define Symbols
//////////////////////////////////////////////////////////////////////
#include <pss_constants.h>
#define GPE_PROG_ID 0x0002
//////////////////////////////////////////////////////////////////////
// Define Structures
//////////////////////////////////////////////////////////////////////
// Declare the offsets of the struct that will be passed to the
// GPE program via the ETR register
//
// struct G_gpe_apss_read_altitude_args =
// {
.struct 0
ERROR_RC:
.struct ERROR_RC + 8
ERROR_FFDC:
.struct ERROR_FFDC + 8
ALTITUDE:
// };
//////////////////////////////////////////////////////////////////////
// Begin Program
//////////////////////////////////////////////////////////////////////
.text
#include <gpe_macros.h>
#include <pss_macros.h>
//--------------------------------------------------------------------
// PORE-GPE Routine Specification:
//
// Name: GPE_apss_read_altitude
//
// Description: Read APSS altitude
//
// Inputs: G_gpe_apss_read_altitude_args
// struct {
// PoreGpeErrorStruct error;
// uint16_t altitude; // This is where the altitude will be stored (output)
// uint8_t reserved[6]; // Requried since GPE only does 8 byte writes.
// } G_gpe_apss_read_altitude_args
// struct {
// uint64_t rc; // This should be read as 63:32=addr, 31:0=rc
// uint64_t ffdc; // Whatever GPE program puts in for FFDC data
// } PoreGpeErrorStruct;
//
// Outputs: Altitude (and FFDC on failure)
//
// End PORE-GPE Routine Specification
//--------------------------------------------------------------------
.global GPE_apss_read_altitude
GPE_apss_read_altitude:
// Copy passed Structure Pointer into A1
mr A1, ETR
// Wait for SPI operations to be complete (10usec timeout)
_wait_for_spi_ops_complete 10, error_timeout
// Setup control regs
// frame_size=16, out_count=16, in_delay1=never, in_count2=16
_putscom SPIPSS_P2S_CTRL_REG0, 0x410FC00004000000
// bridge_enable, clock_divider=7, 2 frames
_putscom SPIPSS_P2S_CTRL_REG1, 0x801C400000000000
// inter_frame_delay=25 (2.5usec)
_putscom SPIPSS_P2S_CTRL_REG2, 0x000C800000000000
// APSS command to get the altitude (APSS cmd 0x9000)
li D0, 0x9000000000000000
_putscom_d0 SPIPSS_P2S_WDATA_REG
// Start SPI transaction
_putscom SPIPSS_P2S_COMMAND_REG, 0x8000000000000000
// wait 10usec for command to complete
waits (10 * MICROSECONDS)
// Wait for SPI operations to be complete (10usec timeout)
_wait_for_spi_ops_complete 10, error_altitude_timeout
// Read altitude and store in structure
_getscom SPIPSS_P2S_RDATA_REG
// The scom data for that cmd is in 2nd two bytes of the register (shift left 2 bytes)
rols D0, D0, 16
std D0, ALTITUDE, A1
halt
error_statusreg:
// An error/reserved bit was set when reading p2s status register...
// D0: P2S_STATUS_REG
_saveffdc GPE_PROG_ID, 0x0002
halt
error_timeout:
// p2s_ongoing bit was never cleared after several retries...
// D0: P2S_STATUS_REG
_saveffdc GPE_PROG_ID, 0x0001
halt
error_altitude_timeout:
// After sending the read altitude command, the p2s_ongoing bit was
// never cleared after several retries...
// D0: P2S_STATUS_REG
_saveffdc GPE_PROG_ID, 0x0003
halt
//////////////////////////////////////////////////////////////////////
// End of Program
//////////////////////////////////////////////////////////////////////
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