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linux/arch/mips/cavium-octeon/executive/cvmx-spi.c
David Daney af866496c7 MIPS: Octeon: Move some Ethernet support files out of staging. 
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: netdev@vger.kernel.org
Cc: devel@driverdev.osuosl.org
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Patchwork: https://patchwork.linux-mips.org/patch/2942/
Patchwork: https://patchwork.linux-mips.org/patch/3012/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-12-07 22:03:28 +00:00

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/***********************license start***************
* Author: Cavium Networks
*
* Contact: support@caviumnetworks.com
* This file is part of the OCTEON SDK
*
* Copyright (c) 2003-2008 Cavium Networks
*
* This file 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.
*
* This file is distributed in the hope that it will be useful, but
* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
* NONINFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this file; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* or visit http://www.gnu.org/licenses/.
*
* This file may also be available under a different license from Cavium.
* Contact Cavium Networks for more information
***********************license end**************************************/
/*
*
* Support library for the SPI
*/
#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-config.h>
#include <asm/octeon/cvmx-pko.h>
#include <asm/octeon/cvmx-spi.h>
#include <asm/octeon/cvmx-spxx-defs.h>
#include <asm/octeon/cvmx-stxx-defs.h>
#include <asm/octeon/cvmx-srxx-defs.h>
#define INVOKE_CB(function_p, args...) \
do { \
if (function_p) { \
res = function_p(args); \
if (res) \
return res; \
} \
} while (0)
#if CVMX_ENABLE_DEBUG_PRINTS
static const char *modes[] =
{ "UNKNOWN", "TX Halfplex", "Rx Halfplex", "Duplex" };
#endif
/* Default callbacks, can be overridden
* using cvmx_spi_get_callbacks/cvmx_spi_set_callbacks
*/
static cvmx_spi_callbacks_t cvmx_spi_callbacks = {
.reset_cb = cvmx_spi_reset_cb,
.calendar_setup_cb = cvmx_spi_calendar_setup_cb,
.clock_detect_cb = cvmx_spi_clock_detect_cb,
.training_cb = cvmx_spi_training_cb,
.calendar_sync_cb = cvmx_spi_calendar_sync_cb,
.interface_up_cb = cvmx_spi_interface_up_cb
};
/**
* Get current SPI4 initialization callbacks
*
* @callbacks: Pointer to the callbacks structure.to fill
*
* Returns Pointer to cvmx_spi_callbacks_t structure.
*/
void cvmx_spi_get_callbacks(cvmx_spi_callbacks_t *callbacks)
{
memcpy(callbacks, &cvmx_spi_callbacks, sizeof(cvmx_spi_callbacks));
}
/**
* Set new SPI4 initialization callbacks
*
* @new_callbacks: Pointer to an updated callbacks structure.
*/
void cvmx_spi_set_callbacks(cvmx_spi_callbacks_t *new_callbacks)
{
memcpy(&cvmx_spi_callbacks, new_callbacks, sizeof(cvmx_spi_callbacks));
}
/**
* Initialize and start the SPI interface.
*
* @interface: The identifier of the packet interface to configure and
* use as a SPI interface.
* @mode: The operating mode for the SPI interface. The interface
* can operate as a full duplex (both Tx and Rx data paths
* active) or as a halfplex (either the Tx data path is
* active or the Rx data path is active, but not both).
* @timeout: Timeout to wait for clock synchronization in seconds
* @num_ports: Number of SPI ports to configure
*
* Returns Zero on success, negative of failure.
*/
int cvmx_spi_start_interface(int interface, cvmx_spi_mode_t mode, int timeout,
int num_ports)
{
int res = -1;
if (!(OCTEON_IS_MODEL(OCTEON_CN38XX) || OCTEON_IS_MODEL(OCTEON_CN58XX)))
return res;
/* Callback to perform SPI4 reset */
INVOKE_CB(cvmx_spi_callbacks.reset_cb, interface, mode);
/* Callback to perform calendar setup */
INVOKE_CB(cvmx_spi_callbacks.calendar_setup_cb, interface, mode,
num_ports);
/* Callback to perform clock detection */
INVOKE_CB(cvmx_spi_callbacks.clock_detect_cb, interface, mode, timeout);
/* Callback to perform SPI4 link training */
INVOKE_CB(cvmx_spi_callbacks.training_cb, interface, mode, timeout);
/* Callback to perform calendar sync */
INVOKE_CB(cvmx_spi_callbacks.calendar_sync_cb, interface, mode,
timeout);
/* Callback to handle interface coming up */
INVOKE_CB(cvmx_spi_callbacks.interface_up_cb, interface, mode);
return res;
}
/**
* This routine restarts the SPI interface after it has lost synchronization
* with its correspondent system.
*
* @interface: The identifier of the packet interface to configure and
* use as a SPI interface.
* @mode: The operating mode for the SPI interface. The interface
* can operate as a full duplex (both Tx and Rx data paths
* active) or as a halfplex (either the Tx data path is
* active or the Rx data path is active, but not both).
* @timeout: Timeout to wait for clock synchronization in seconds
*
* Returns Zero on success, negative of failure.
*/
int cvmx_spi_restart_interface(int interface, cvmx_spi_mode_t mode, int timeout)
{
int res = -1;
if (!(OCTEON_IS_MODEL(OCTEON_CN38XX) || OCTEON_IS_MODEL(OCTEON_CN58XX)))
return res;
cvmx_dprintf("SPI%d: Restart %s\n", interface, modes[mode]);
/* Callback to perform SPI4 reset */
INVOKE_CB(cvmx_spi_callbacks.reset_cb, interface, mode);
/* NOTE: Calendar setup is not performed during restart */
/* Refer to cvmx_spi_start_interface() for the full sequence */
/* Callback to perform clock detection */
INVOKE_CB(cvmx_spi_callbacks.clock_detect_cb, interface, mode, timeout);
/* Callback to perform SPI4 link training */
INVOKE_CB(cvmx_spi_callbacks.training_cb, interface, mode, timeout);
/* Callback to perform calendar sync */
INVOKE_CB(cvmx_spi_callbacks.calendar_sync_cb, interface, mode,
timeout);
/* Callback to handle interface coming up */
INVOKE_CB(cvmx_spi_callbacks.interface_up_cb, interface, mode);
return res;
}
/**
* Callback to perform SPI4 reset
*
* @interface: The identifier of the packet interface to configure and
* use as a SPI interface.
* @mode: The operating mode for the SPI interface. The interface
* can operate as a full duplex (both Tx and Rx data paths
* active) or as a halfplex (either the Tx data path is
* active or the Rx data path is active, but not both).
*
* Returns Zero on success, non-zero error code on failure (will cause
* SPI initialization to abort)
*/
int cvmx_spi_reset_cb(int interface, cvmx_spi_mode_t mode)
{
union cvmx_spxx_dbg_deskew_ctl spxx_dbg_deskew_ctl;
union cvmx_spxx_clk_ctl spxx_clk_ctl;
union cvmx_spxx_bist_stat spxx_bist_stat;
union cvmx_spxx_int_msk spxx_int_msk;
union cvmx_stxx_int_msk stxx_int_msk;
union cvmx_spxx_trn4_ctl spxx_trn4_ctl;
int index;
uint64_t MS = cvmx_sysinfo_get()->cpu_clock_hz / 1000;
/* Disable SPI error events while we run BIST */
spxx_int_msk.u64 = cvmx_read_csr(CVMX_SPXX_INT_MSK(interface));
cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), 0);
stxx_int_msk.u64 = cvmx_read_csr(CVMX_STXX_INT_MSK(interface));
cvmx_write_csr(CVMX_STXX_INT_MSK(interface), 0);
/* Run BIST in the SPI interface */
cvmx_write_csr(CVMX_SRXX_COM_CTL(interface), 0);
cvmx_write_csr(CVMX_STXX_COM_CTL(interface), 0);
spxx_clk_ctl.u64 = 0;
spxx_clk_ctl.s.runbist = 1;
cvmx_write_csr(CVMX_SPXX_CLK_CTL(interface), spxx_clk_ctl.u64);
cvmx_wait(10 * MS);
spxx_bist_stat.u64 = cvmx_read_csr(CVMX_SPXX_BIST_STAT(interface));
if (spxx_bist_stat.s.stat0)
cvmx_dprintf
("ERROR SPI%d: BIST failed on receive datapath FIFO\n",
interface);
if (spxx_bist_stat.s.stat1)
cvmx_dprintf("ERROR SPI%d: BIST failed on RX calendar table\n",
interface);
if (spxx_bist_stat.s.stat2)
cvmx_dprintf("ERROR SPI%d: BIST failed on TX calendar table\n",
interface);
/* Clear the calendar table after BIST to fix parity errors */
for (index = 0; index < 32; index++) {
union cvmx_srxx_spi4_calx srxx_spi4_calx;
union cvmx_stxx_spi4_calx stxx_spi4_calx;
srxx_spi4_calx.u64 = 0;
srxx_spi4_calx.s.oddpar = 1;
cvmx_write_csr(CVMX_SRXX_SPI4_CALX(index, interface),
srxx_spi4_calx.u64);
stxx_spi4_calx.u64 = 0;
stxx_spi4_calx.s.oddpar = 1;
cvmx_write_csr(CVMX_STXX_SPI4_CALX(index, interface),
stxx_spi4_calx.u64);
}
/* Re enable reporting of error interrupts */
cvmx_write_csr(CVMX_SPXX_INT_REG(interface),
cvmx_read_csr(CVMX_SPXX_INT_REG(interface)));
cvmx_write_csr(CVMX_SPXX_INT_MSK(interface), spxx_int_msk.u64);
cvmx_write_csr(CVMX_STXX_INT_REG(interface),
cvmx_read_csr(CVMX_STXX_INT_REG(interface)));
cvmx_write_csr(CVMX_STXX_INT_MSK(interface), stxx_int_msk.u64);
/* Setup the CLKDLY right in the middle */
spxx_clk_ctl.u64 = 0;
spxx_clk_ctl.s.seetrn = 0;
spxx_clk_ctl.s.clkdly = 0x10;
spxx_clk_ctl.s.runbist = 0;
spxx_clk_ctl.s.statdrv = 0;
/* This should always be on the opposite edge as statdrv */
spxx_clk_ctl.s.statrcv = 1;
spxx_clk_ctl.s.sndtrn = 0;
spxx_clk_ctl.s.drptrn = 0;
spxx_clk_ctl.s.rcvtrn = 0;
spxx_clk_ctl.s.srxdlck = 0;
cvmx_write_csr(CVMX_SPXX_CLK_CTL(interface), spxx_clk_ctl.u64);
cvmx_wait(100 * MS);
/* Reset SRX0 DLL */
spxx_clk_ctl.s.srxdlck = 1;
cvmx_write_csr(CVMX_SPXX_CLK_CTL(interface), spxx_clk_ctl.u64);
/* Waiting for Inf0 Spi4 RX DLL to lock */
cvmx_wait(100 * MS);
/* Enable dynamic alignment */
spxx_trn4_ctl.s.trntest = 0;
spxx_trn4_ctl.s.jitter = 1;
spxx_trn4_ctl.s.clr_boot = 1;
spxx_trn4_ctl.s.set_boot = 0;
if (OCTEON_IS_MODEL(OCTEON_CN58XX))
spxx_trn4_ctl.s.maxdist = 3;
else
spxx_trn4_ctl.s.maxdist = 8;
spxx_trn4_ctl.s.macro_en = 1;
spxx_trn4_ctl.s.mux_en = 1;
cvmx_write_csr(CVMX_SPXX_TRN4_CTL(interface), spxx_trn4_ctl.u64);
spxx_dbg_deskew_ctl.u64 = 0;
cvmx_write_csr(CVMX_SPXX_DBG_DESKEW_CTL(interface),
spxx_dbg_deskew_ctl.u64);
return 0;
}
/**
* Callback to setup calendar and miscellaneous settings before clock detection
*
* @interface: The identifier of the packet interface to configure and
* use as a SPI interface.
* @mode: The operating mode for the SPI interface. The interface
* can operate as a full duplex (both Tx and Rx data paths
* active) or as a halfplex (either the Tx data path is
* active or the Rx data path is active, but not both).
* @num_ports: Number of ports to configure on SPI
*
* Returns Zero on success, non-zero error code on failure (will cause
* SPI initialization to abort)
*/
int cvmx_spi_calendar_setup_cb(int interface, cvmx_spi_mode_t mode,
int num_ports)
{
int port;
int index;
if (mode & CVMX_SPI_MODE_RX_HALFPLEX) {
union cvmx_srxx_com_ctl srxx_com_ctl;
union cvmx_srxx_spi4_stat srxx_spi4_stat;
/* SRX0 number of Ports */
srxx_com_ctl.u64 = 0;
srxx_com_ctl.s.prts = num_ports - 1;
srxx_com_ctl.s.st_en = 0;
srxx_com_ctl.s.inf_en = 0;
cvmx_write_csr(CVMX_SRXX_COM_CTL(interface), srxx_com_ctl.u64);
/* SRX0 Calendar Table. This round robbins through all ports */
port = 0;
index = 0;
while (port < num_ports) {
union cvmx_srxx_spi4_calx srxx_spi4_calx;
srxx_spi4_calx.u64 = 0;
srxx_spi4_calx.s.prt0 = port++;
srxx_spi4_calx.s.prt1 = port++;
srxx_spi4_calx.s.prt2 = port++;
srxx_spi4_calx.s.prt3 = port++;
srxx_spi4_calx.s.oddpar =
~(cvmx_dpop(srxx_spi4_calx.u64) & 1);
cvmx_write_csr(CVMX_SRXX_SPI4_CALX(index, interface),
srxx_spi4_calx.u64);
index++;
}
srxx_spi4_stat.u64 = 0;
srxx_spi4_stat.s.len = num_ports;
srxx_spi4_stat.s.m = 1;
cvmx_write_csr(CVMX_SRXX_SPI4_STAT(interface),
srxx_spi4_stat.u64);
}
if (mode & CVMX_SPI_MODE_TX_HALFPLEX) {
union cvmx_stxx_arb_ctl stxx_arb_ctl;
union cvmx_gmxx_tx_spi_max gmxx_tx_spi_max;
union cvmx_gmxx_tx_spi_thresh gmxx_tx_spi_thresh;
union cvmx_gmxx_tx_spi_ctl gmxx_tx_spi_ctl;
union cvmx_stxx_spi4_stat stxx_spi4_stat;
union cvmx_stxx_spi4_dat stxx_spi4_dat;
/* STX0 Config */
stxx_arb_ctl.u64 = 0;
stxx_arb_ctl.s.igntpa = 0;
stxx_arb_ctl.s.mintrn = 0;
cvmx_write_csr(CVMX_STXX_ARB_CTL(interface), stxx_arb_ctl.u64);
gmxx_tx_spi_max.u64 = 0;
gmxx_tx_spi_max.s.max1 = 8;
gmxx_tx_spi_max.s.max2 = 4;
gmxx_tx_spi_max.s.slice = 0;
cvmx_write_csr(CVMX_GMXX_TX_SPI_MAX(interface),
gmxx_tx_spi_max.u64);
gmxx_tx_spi_thresh.u64 = 0;
gmxx_tx_spi_thresh.s.thresh = 4;
cvmx_write_csr(CVMX_GMXX_TX_SPI_THRESH(interface),
gmxx_tx_spi_thresh.u64);
gmxx_tx_spi_ctl.u64 = 0;
gmxx_tx_spi_ctl.s.tpa_clr = 0;
gmxx_tx_spi_ctl.s.cont_pkt = 0;
cvmx_write_csr(CVMX_GMXX_TX_SPI_CTL(interface),
gmxx_tx_spi_ctl.u64);
/* STX0 Training Control */
stxx_spi4_dat.u64 = 0;
/*Minimum needed by dynamic alignment */
stxx_spi4_dat.s.alpha = 32;
stxx_spi4_dat.s.max_t = 0xFFFF; /*Minimum interval is 0x20 */
cvmx_write_csr(CVMX_STXX_SPI4_DAT(interface),
stxx_spi4_dat.u64);
/* STX0 Calendar Table. This round robbins through all ports */
port = 0;
index = 0;
while (port < num_ports) {
union cvmx_stxx_spi4_calx stxx_spi4_calx;
stxx_spi4_calx.u64 = 0;
stxx_spi4_calx.s.prt0 = port++;
stxx_spi4_calx.s.prt1 = port++;
stxx_spi4_calx.s.prt2 = port++;
stxx_spi4_calx.s.prt3 = port++;
stxx_spi4_calx.s.oddpar =
~(cvmx_dpop(stxx_spi4_calx.u64) & 1);
cvmx_write_csr(CVMX_STXX_SPI4_CALX(index, interface),
stxx_spi4_calx.u64);
index++;
}
stxx_spi4_stat.u64 = 0;
stxx_spi4_stat.s.len = num_ports;
stxx_spi4_stat.s.m = 1;
cvmx_write_csr(CVMX_STXX_SPI4_STAT(interface),
stxx_spi4_stat.u64);
}
return 0;
}
/**
* Callback to perform clock detection
*
* @interface: The identifier of the packet interface to configure and
* use as a SPI interface.
* @mode: The operating mode for the SPI interface. The interface
* can operate as a full duplex (both Tx and Rx data paths
* active) or as a halfplex (either the Tx data path is
* active or the Rx data path is active, but not both).
* @timeout: Timeout to wait for clock synchronization in seconds
*
* Returns Zero on success, non-zero error code on failure (will cause
* SPI initialization to abort)
*/
int cvmx_spi_clock_detect_cb(int interface, cvmx_spi_mode_t mode, int timeout)
{
int clock_transitions;
union cvmx_spxx_clk_stat stat;
uint64_t timeout_time;
uint64_t MS = cvmx_sysinfo_get()->cpu_clock_hz / 1000;
/*
* Regardless of operating mode, both Tx and Rx clocks must be
* present for the SPI interface to operate.
*/
cvmx_dprintf("SPI%d: Waiting to see TsClk...\n", interface);
timeout_time = cvmx_get_cycle() + 1000ull * MS * timeout;
/*
* Require 100 clock transitions in order to avoid any noise
* in the beginning.
*/
clock_transitions = 100;
do {
stat.u64 = cvmx_read_csr(CVMX_SPXX_CLK_STAT(interface));
if (stat.s.s4clk0 && stat.s.s4clk1 && clock_transitions) {
/*
* We've seen a clock transition, so decrement
* the number we still need.
*/
clock_transitions--;
cvmx_write_csr(CVMX_SPXX_CLK_STAT(interface), stat.u64);
stat.s.s4clk0 = 0;
stat.s.s4clk1 = 0;
}
if (cvmx_get_cycle() > timeout_time) {
cvmx_dprintf("SPI%d: Timeout\n", interface);
return -1;
}
} while (stat.s.s4clk0 == 0 || stat.s.s4clk1 == 0);
cvmx_dprintf("SPI%d: Waiting to see RsClk...\n", interface);
timeout_time = cvmx_get_cycle() + 1000ull * MS * timeout;
/*
* Require 100 clock transitions in order to avoid any noise in the
* beginning.
*/
clock_transitions = 100;
do {
stat.u64 = cvmx_read_csr(CVMX_SPXX_CLK_STAT(interface));
if (stat.s.d4clk0 && stat.s.d4clk1 && clock_transitions) {
/*
* We've seen a clock transition, so decrement
* the number we still need
*/
clock_transitions--;
cvmx_write_csr(CVMX_SPXX_CLK_STAT(interface), stat.u64);
stat.s.d4clk0 = 0;
stat.s.d4clk1 = 0;
}
if (cvmx_get_cycle() > timeout_time) {
cvmx_dprintf("SPI%d: Timeout\n", interface);
return -1;
}
} while (stat.s.d4clk0 == 0 || stat.s.d4clk1 == 0);
return 0;
}
/**
* Callback to perform link training
*
* @interface: The identifier of the packet interface to configure and
* use as a SPI interface.
* @mode: The operating mode for the SPI interface. The interface
* can operate as a full duplex (both Tx and Rx data paths
* active) or as a halfplex (either the Tx data path is
* active or the Rx data path is active, but not both).
* @timeout: Timeout to wait for link to be trained (in seconds)
*
* Returns Zero on success, non-zero error code on failure (will cause
* SPI initialization to abort)
*/
int cvmx_spi_training_cb(int interface, cvmx_spi_mode_t mode, int timeout)
{
union cvmx_spxx_trn4_ctl spxx_trn4_ctl;
union cvmx_spxx_clk_stat stat;
uint64_t MS = cvmx_sysinfo_get()->cpu_clock_hz / 1000;
uint64_t timeout_time = cvmx_get_cycle() + 1000ull * MS * timeout;
int rx_training_needed;
/* SRX0 & STX0 Inf0 Links are configured - begin training */
union cvmx_spxx_clk_ctl spxx_clk_ctl;
spxx_clk_ctl.u64 = 0;
spxx_clk_ctl.s.seetrn = 0;
spxx_clk_ctl.s.clkdly = 0x10;
spxx_clk_ctl.s.runbist = 0;
spxx_clk_ctl.s.statdrv = 0;
/* This should always be on the opposite edge as statdrv */
spxx_clk_ctl.s.statrcv = 1;
spxx_clk_ctl.s.sndtrn = 1;
spxx_clk_ctl.s.drptrn = 1;
spxx_clk_ctl.s.rcvtrn = 1;
spxx_clk_ctl.s.srxdlck = 1;
cvmx_write_csr(CVMX_SPXX_CLK_CTL(interface), spxx_clk_ctl.u64);
cvmx_wait(1000 * MS);
/* SRX0 clear the boot bit */
spxx_trn4_ctl.u64 = cvmx_read_csr(CVMX_SPXX_TRN4_CTL(interface));
spxx_trn4_ctl.s.clr_boot = 1;
cvmx_write_csr(CVMX_SPXX_TRN4_CTL(interface), spxx_trn4_ctl.u64);
/* Wait for the training sequence to complete */
cvmx_dprintf("SPI%d: Waiting for training\n", interface);
cvmx_wait(1000 * MS);
/* Wait a really long time here */
timeout_time = cvmx_get_cycle() + 1000ull * MS * 600;
/*
* The HRM says we must wait for 34 + 16 * MAXDIST training sequences.
* We'll be pessimistic and wait for a lot more.
*/
rx_training_needed = 500;
do {
stat.u64 = cvmx_read_csr(CVMX_SPXX_CLK_STAT(interface));
if (stat.s.srxtrn && rx_training_needed) {
rx_training_needed--;
cvmx_write_csr(CVMX_SPXX_CLK_STAT(interface), stat.u64);
stat.s.srxtrn = 0;
}
if (cvmx_get_cycle() > timeout_time) {
cvmx_dprintf("SPI%d: Timeout\n", interface);
return -1;
}
} while (stat.s.srxtrn == 0);
return 0;
}
/**
* Callback to perform calendar data synchronization
*
* @interface: The identifier of the packet interface to configure and
* use as a SPI interface.
* @mode: The operating mode for the SPI interface. The interface
* can operate as a full duplex (both Tx and Rx data paths
* active) or as a halfplex (either the Tx data path is
* active or the Rx data path is active, but not both).
* @timeout: Timeout to wait for calendar data in seconds
*
* Returns Zero on success, non-zero error code on failure (will cause
* SPI initialization to abort)
*/
int cvmx_spi_calendar_sync_cb(int interface, cvmx_spi_mode_t mode, int timeout)
{
uint64_t MS = cvmx_sysinfo_get()->cpu_clock_hz / 1000;
if (mode & CVMX_SPI_MODE_RX_HALFPLEX) {
/* SRX0 interface should be good, send calendar data */
union cvmx_srxx_com_ctl srxx_com_ctl;
cvmx_dprintf
("SPI%d: Rx is synchronized, start sending calendar data\n",
interface);
srxx_com_ctl.u64 = cvmx_read_csr(CVMX_SRXX_COM_CTL(interface));
srxx_com_ctl.s.inf_en = 1;
srxx_com_ctl.s.st_en = 1;
cvmx_write_csr(CVMX_SRXX_COM_CTL(interface), srxx_com_ctl.u64);
}
if (mode & CVMX_SPI_MODE_TX_HALFPLEX) {
/* STX0 has achieved sync */
/* The corespondant board should be sending calendar data */
/* Enable the STX0 STAT receiver. */
union cvmx_spxx_clk_stat stat;
uint64_t timeout_time;
union cvmx_stxx_com_ctl stxx_com_ctl;
stxx_com_ctl.u64 = 0;
stxx_com_ctl.s.st_en = 1;
cvmx_write_csr(CVMX_STXX_COM_CTL(interface), stxx_com_ctl.u64);
/* Waiting for calendar sync on STX0 STAT */
cvmx_dprintf("SPI%d: Waiting to sync on STX[%d] STAT\n",
interface, interface);
timeout_time = cvmx_get_cycle() + 1000ull * MS * timeout;
/* SPX0_CLK_STAT - SPX0_CLK_STAT[STXCAL] should be 1 (bit10) */
do {
stat.u64 = cvmx_read_csr(CVMX_SPXX_CLK_STAT(interface));
if (cvmx_get_cycle() > timeout_time) {
cvmx_dprintf("SPI%d: Timeout\n", interface);
return -1;
}
} while (stat.s.stxcal == 0);
}
return 0;
}
/**
* Callback to handle interface up
*
* @interface: The identifier of the packet interface to configure and
* use as a SPI interface.
* @mode: The operating mode for the SPI interface. The interface
* can operate as a full duplex (both Tx and Rx data paths
* active) or as a halfplex (either the Tx data path is
* active or the Rx data path is active, but not both).
*
* Returns Zero on success, non-zero error code on failure (will cause
* SPI initialization to abort)
*/
int cvmx_spi_interface_up_cb(int interface, cvmx_spi_mode_t mode)
{
union cvmx_gmxx_rxx_frm_min gmxx_rxx_frm_min;
union cvmx_gmxx_rxx_frm_max gmxx_rxx_frm_max;
union cvmx_gmxx_rxx_jabber gmxx_rxx_jabber;
if (mode & CVMX_SPI_MODE_RX_HALFPLEX) {
union cvmx_srxx_com_ctl srxx_com_ctl;
srxx_com_ctl.u64 = cvmx_read_csr(CVMX_SRXX_COM_CTL(interface));
srxx_com_ctl.s.inf_en = 1;
cvmx_write_csr(CVMX_SRXX_COM_CTL(interface), srxx_com_ctl.u64);
cvmx_dprintf("SPI%d: Rx is now up\n", interface);
}
if (mode & CVMX_SPI_MODE_TX_HALFPLEX) {
union cvmx_stxx_com_ctl stxx_com_ctl;
stxx_com_ctl.u64 = cvmx_read_csr(CVMX_STXX_COM_CTL(interface));
stxx_com_ctl.s.inf_en = 1;
cvmx_write_csr(CVMX_STXX_COM_CTL(interface), stxx_com_ctl.u64);
cvmx_dprintf("SPI%d: Tx is now up\n", interface);
}
gmxx_rxx_frm_min.u64 = 0;
gmxx_rxx_frm_min.s.len = 64;
cvmx_write_csr(CVMX_GMXX_RXX_FRM_MIN(0, interface),
gmxx_rxx_frm_min.u64);
gmxx_rxx_frm_max.u64 = 0;
gmxx_rxx_frm_max.s.len = 64 * 1024 - 4;
cvmx_write_csr(CVMX_GMXX_RXX_FRM_MAX(0, interface),
gmxx_rxx_frm_max.u64);
gmxx_rxx_jabber.u64 = 0;
gmxx_rxx_jabber.s.cnt = 64 * 1024 - 4;
cvmx_write_csr(CVMX_GMXX_RXX_JABBER(0, interface), gmxx_rxx_jabber.u64);
return 0;
}
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