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[linux/fpc-iii.git] / arch / mips / cavium-octeon / executive / cvmx-pko.c

/***********************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 hardware Packet Output unit.
 */

#include <asm/octeon/octeon.h>

#include <asm/octeon/cvmx-config.h>
#include <asm/octeon/cvmx-pko.h>
#include <asm/octeon/cvmx-helper.h>

/**
 * Internal state of packet output
 */

/**
 * Call before any other calls to initialize the packet
 * output system.  This does chip global config, and should only be
 * done by one core.
 */

void cvmx_pko_initialize_global(void)
{
        int i;
        uint64_t priority = 8;
        union cvmx_pko_reg_cmd_buf config;

        /*
         * Set the size of the PKO command buffers to an odd number of
         * 64bit words. This allows the normal two word send to stay
         * aligned and never span a comamnd word buffer.
         */
        config.u64 = 0;
        config.s.pool = CVMX_FPA_OUTPUT_BUFFER_POOL;
        config.s.size = CVMX_FPA_OUTPUT_BUFFER_POOL_SIZE / 8 - 1;

        cvmx_write_csr(CVMX_PKO_REG_CMD_BUF, config.u64);

        for (i = 0; i < CVMX_PKO_MAX_OUTPUT_QUEUES; i++)
                cvmx_pko_config_port(CVMX_PKO_MEM_QUEUE_PTRS_ILLEGAL_PID, i, 1,
                                     &priority);

        /*
         * If we aren't using all of the queues optimize PKO's
         * internal memory.
         */
        if (OCTEON_IS_MODEL(OCTEON_CN38XX) || OCTEON_IS_MODEL(OCTEON_CN58XX)
            || OCTEON_IS_MODEL(OCTEON_CN56XX)
            || OCTEON_IS_MODEL(OCTEON_CN52XX)) {
                int num_interfaces = cvmx_helper_get_number_of_interfaces();
                int last_port =
                    cvmx_helper_get_last_ipd_port(num_interfaces - 1);
                int max_queues =
                    cvmx_pko_get_base_queue(last_port) +
                    cvmx_pko_get_num_queues(last_port);
                if (OCTEON_IS_MODEL(OCTEON_CN38XX)) {
                        if (max_queues <= 32)
                                cvmx_write_csr(CVMX_PKO_REG_QUEUE_MODE, 2);
                        else if (max_queues <= 64)
                                cvmx_write_csr(CVMX_PKO_REG_QUEUE_MODE, 1);
                } else {
                        if (max_queues <= 64)
                                cvmx_write_csr(CVMX_PKO_REG_QUEUE_MODE, 2);
                        else if (max_queues <= 128)
                                cvmx_write_csr(CVMX_PKO_REG_QUEUE_MODE, 1);
                }
        }
}

/**
 * This function does per-core initialization required by the PKO routines.
 * This must be called on all cores that will do packet output, and must
 * be called after the FPA has been initialized and filled with pages.
 *
 * Returns 0 on success
 *         !0 on failure
 */
int cvmx_pko_initialize_local(void)
{
        /* Nothing to do */
        return 0;
}

/**
 * Enables the packet output hardware. It must already be
 * configured.
 */
void cvmx_pko_enable(void)
{
        union cvmx_pko_reg_flags flags;

        flags.u64 = cvmx_read_csr(CVMX_PKO_REG_FLAGS);
        if (flags.s.ena_pko)
                cvmx_dprintf
                    ("Warning: Enabling PKO when PKO already enabled.\n");

        flags.s.ena_dwb = 1;
        flags.s.ena_pko = 1;
        /*
         * always enable big endian for 3-word command. Does nothing
         * for 2-word.
         */
        flags.s.store_be = 1;
        cvmx_write_csr(CVMX_PKO_REG_FLAGS, flags.u64);
}

/**
 * Disables the packet output. Does not affect any configuration.
 */
void cvmx_pko_disable(void)
{
        union cvmx_pko_reg_flags pko_reg_flags;
        pko_reg_flags.u64 = cvmx_read_csr(CVMX_PKO_REG_FLAGS);
        pko_reg_flags.s.ena_pko = 0;
        cvmx_write_csr(CVMX_PKO_REG_FLAGS, pko_reg_flags.u64);
}
EXPORT_SYMBOL_GPL(cvmx_pko_disable);

/**
 * Reset the packet output.
 */
static void __cvmx_pko_reset(void)
{
        union cvmx_pko_reg_flags pko_reg_flags;
        pko_reg_flags.u64 = cvmx_read_csr(CVMX_PKO_REG_FLAGS);
        pko_reg_flags.s.reset = 1;
        cvmx_write_csr(CVMX_PKO_REG_FLAGS, pko_reg_flags.u64);
}

/**
 * Shutdown and free resources required by packet output.
 */
void cvmx_pko_shutdown(void)
{
        union cvmx_pko_mem_queue_ptrs config;
        int queue;

        cvmx_pko_disable();

        for (queue = 0; queue < CVMX_PKO_MAX_OUTPUT_QUEUES; queue++) {
                config.u64 = 0;
                config.s.tail = 1;
                config.s.index = 0;
                config.s.port = CVMX_PKO_MEM_QUEUE_PTRS_ILLEGAL_PID;
                config.s.queue = queue & 0x7f;
                config.s.qos_mask = 0;
                config.s.buf_ptr = 0;
                if (!OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
                        union cvmx_pko_reg_queue_ptrs1 config1;
                        config1.u64 = 0;
                        config1.s.qid7 = queue >> 7;
                        cvmx_write_csr(CVMX_PKO_REG_QUEUE_PTRS1, config1.u64);
                }
                cvmx_write_csr(CVMX_PKO_MEM_QUEUE_PTRS, config.u64);
                cvmx_cmd_queue_shutdown(CVMX_CMD_QUEUE_PKO(queue));
        }
        __cvmx_pko_reset();
}
EXPORT_SYMBOL_GPL(cvmx_pko_shutdown);

/**
 * Configure a output port and the associated queues for use.
 *
 * @port:       Port to configure.
 * @base_queue: First queue number to associate with this port.
 * @num_queues: Number of queues to associate with this port
 * @priority:   Array of priority levels for each queue. Values are
 *                   allowed to be 0-8. A value of 8 get 8 times the traffic
 *                   of a value of 1.  A value of 0 indicates that no rounds
 *                   will be participated in. These priorities can be changed
 *                   on the fly while the pko is enabled. A priority of 9
 *                   indicates that static priority should be used.  If static
 *                   priority is used all queues with static priority must be
 *                   contiguous starting at the base_queue, and lower numbered
 *                   queues have higher priority than higher numbered queues.
 *                   There must be num_queues elements in the array.
 */
cvmx_pko_status_t cvmx_pko_config_port(uint64_t port, uint64_t base_queue,
                                       uint64_t num_queues,
                                       const uint64_t priority[])
{
        cvmx_pko_status_t result_code;
        uint64_t queue;
        union cvmx_pko_mem_queue_ptrs config;
        union cvmx_pko_reg_queue_ptrs1 config1;
        int static_priority_base = -1;
        int static_priority_end = -1;

        if ((port >= CVMX_PKO_NUM_OUTPUT_PORTS)
            && (port != CVMX_PKO_MEM_QUEUE_PTRS_ILLEGAL_PID)) {
                cvmx_dprintf("ERROR: cvmx_pko_config_port: Invalid port %llu\n",
                             (unsigned long long)port);
                return CVMX_PKO_INVALID_PORT;
        }

        if (base_queue + num_queues > CVMX_PKO_MAX_OUTPUT_QUEUES) {
                cvmx_dprintf
                    ("ERROR: cvmx_pko_config_port: Invalid queue range %llu\n",
                     (unsigned long long)(base_queue + num_queues));
                return CVMX_PKO_INVALID_QUEUE;
        }

        if (port != CVMX_PKO_MEM_QUEUE_PTRS_ILLEGAL_PID) {
                /*
                 * Validate the static queue priority setup and set
                 * static_priority_base and static_priority_end
                 * accordingly.
                 */
                for (queue = 0; queue < num_queues; queue++) {
                        /* Find first queue of static priority */
                        if (static_priority_base == -1
                            && priority[queue] ==
                            CVMX_PKO_QUEUE_STATIC_PRIORITY)
                                static_priority_base = queue;
                        /* Find last queue of static priority */
                        if (static_priority_base != -1
                            && static_priority_end == -1
                            && priority[queue] != CVMX_PKO_QUEUE_STATIC_PRIORITY
                            && queue)
                                static_priority_end = queue - 1;
                        else if (static_priority_base != -1
                                 && static_priority_end == -1
                                 && queue == num_queues - 1)
                                /* all queues are static priority */
                                static_priority_end = queue;
                        /*
                         * Check to make sure all static priority
                         * queues are contiguous.  Also catches some
                         * cases of static priorites not starting at
                         * queue 0.
                         */
                        if (static_priority_end != -1
                            && (int)queue > static_priority_end
                            && priority[queue] ==
                            CVMX_PKO_QUEUE_STATIC_PRIORITY) {
                                cvmx_dprintf("ERROR: cvmx_pko_config_port: "
                                             "Static priority queues aren't "
                                             "contiguous or don't start at "
                                             "base queue. q: %d, eq: %d\n",
                                        (int)queue, static_priority_end);
                                return CVMX_PKO_INVALID_PRIORITY;
                        }
                }
                if (static_priority_base > 0) {
                        cvmx_dprintf("ERROR: cvmx_pko_config_port: Static "
                                     "priority queues don't start at base "
                                     "queue. sq: %d\n",
                                static_priority_base);
                        return CVMX_PKO_INVALID_PRIORITY;
                }
#if 0
                cvmx_dprintf("Port %d: Static priority queue base: %d, "
                             "end: %d\n", port,
                        static_priority_base, static_priority_end);
#endif
        }
        /*
         * At this point, static_priority_base and static_priority_end
         * are either both -1, or are valid start/end queue
         * numbers.
         */

        result_code = CVMX_PKO_SUCCESS;

#ifdef PKO_DEBUG
        cvmx_dprintf("num queues: %d (%lld,%lld)\n", num_queues,
                     CVMX_PKO_QUEUES_PER_PORT_INTERFACE0,
                     CVMX_PKO_QUEUES_PER_PORT_INTERFACE1);
#endif

        for (queue = 0; queue < num_queues; queue++) {
                uint64_t *buf_ptr = NULL;

                config1.u64 = 0;
                config1.s.idx3 = queue >> 3;
                config1.s.qid7 = (base_queue + queue) >> 7;

                config.u64 = 0;
                config.s.tail = queue == (num_queues - 1);
                config.s.index = queue;
                config.s.port = port;
                config.s.queue = base_queue + queue;

                if (!cvmx_octeon_is_pass1()) {
                        config.s.static_p = static_priority_base >= 0;
                        config.s.static_q = (int)queue <= static_priority_end;
                        config.s.s_tail = (int)queue == static_priority_end;
                }
                /*
                 * Convert the priority into an enable bit field. Try
                 * to space the bits out evenly so the packet don't
                 * get grouped up
                 */
                switch ((int)priority[queue]) {
                case 0:
                        config.s.qos_mask = 0x00;
                        break;
                case 1:
                        config.s.qos_mask = 0x01;
                        break;
                case 2:
                        config.s.qos_mask = 0x11;
                        break;
                case 3:
                        config.s.qos_mask = 0x49;
                        break;
                case 4:
                        config.s.qos_mask = 0x55;
                        break;
                case 5:
                        config.s.qos_mask = 0x57;
                        break;
                case 6:
                        config.s.qos_mask = 0x77;
                        break;
                case 7:
                        config.s.qos_mask = 0x7f;
                        break;
                case 8:
                        config.s.qos_mask = 0xff;
                        break;
                case CVMX_PKO_QUEUE_STATIC_PRIORITY:
                        /* Pass 1 will fall through to the error case */
                        if (!cvmx_octeon_is_pass1()) {
                                config.s.qos_mask = 0xff;
                                break;
                        }
                default:
                        cvmx_dprintf("ERROR: cvmx_pko_config_port: Invalid "
                                     "priority %llu\n",
                                (unsigned long long)priority[queue]);
                        config.s.qos_mask = 0xff;
                        result_code = CVMX_PKO_INVALID_PRIORITY;
                        break;
                }

                if (port != CVMX_PKO_MEM_QUEUE_PTRS_ILLEGAL_PID) {
                        cvmx_cmd_queue_result_t cmd_res =
                            cvmx_cmd_queue_initialize(CVMX_CMD_QUEUE_PKO
                                                      (base_queue + queue),
                                                      CVMX_PKO_MAX_QUEUE_DEPTH,
                                                      CVMX_FPA_OUTPUT_BUFFER_POOL,
                                                      CVMX_FPA_OUTPUT_BUFFER_POOL_SIZE
                                                      -
                                                      CVMX_PKO_COMMAND_BUFFER_SIZE_ADJUST
                                                      * 8);
                        if (cmd_res != CVMX_CMD_QUEUE_SUCCESS) {
                                switch (cmd_res) {
                                case CVMX_CMD_QUEUE_NO_MEMORY:
                                        cvmx_dprintf("ERROR: "
                                                     "cvmx_pko_config_port: "
                                                     "Unable to allocate "
                                                     "output buffer.\n");
                                        return CVMX_PKO_NO_MEMORY;
                                case CVMX_CMD_QUEUE_ALREADY_SETUP:
                                        cvmx_dprintf
                                            ("ERROR: cvmx_pko_config_port: Port already setup.\n");
                                        return CVMX_PKO_PORT_ALREADY_SETUP;
                                case CVMX_CMD_QUEUE_INVALID_PARAM:
                                default:
                                        cvmx_dprintf
                                            ("ERROR: cvmx_pko_config_port: Command queue initialization failed.\n");
                                        return CVMX_PKO_CMD_QUEUE_INIT_ERROR;
                                }
                        }

                        buf_ptr =
                            (uint64_t *)
                            cvmx_cmd_queue_buffer(CVMX_CMD_QUEUE_PKO
                                                  (base_queue + queue));
                        config.s.buf_ptr = cvmx_ptr_to_phys(buf_ptr);
                } else
                        config.s.buf_ptr = 0;

                CVMX_SYNCWS;

                if (!OCTEON_IS_MODEL(OCTEON_CN3XXX))
                        cvmx_write_csr(CVMX_PKO_REG_QUEUE_PTRS1, config1.u64);
                cvmx_write_csr(CVMX_PKO_MEM_QUEUE_PTRS, config.u64);
        }

        return result_code;
}

#ifdef PKO_DEBUG
/**
 * Show map of ports -> queues for different cores.
 */
void cvmx_pko_show_queue_map()
{
        int core, port;
        int pko_output_ports = 36;

        cvmx_dprintf("port");
        for (port = 0; port < pko_output_ports; port++)
                cvmx_dprintf("%3d ", port);
        cvmx_dprintf("\n");

        for (core = 0; core < CVMX_MAX_CORES; core++) {
                cvmx_dprintf("\n%2d: ", core);
                for (port = 0; port < pko_output_ports; port++) {
                        cvmx_dprintf("%3d ",
                                     cvmx_pko_get_base_queue_per_core(port,
                                                                      core));
                }
        }
        cvmx_dprintf("\n");
}
#endif

/**
 * Rate limit a PKO port to a max packets/sec. This function is only
 * supported on CN51XX and higher, excluding CN58XX.
 *
 * @port:      Port to rate limit
 * @packets_s: Maximum packet/sec
 * @burst:     Maximum number of packets to burst in a row before rate
 *                  limiting cuts in.
 *
 * Returns Zero on success, negative on failure
 */
int cvmx_pko_rate_limit_packets(int port, int packets_s, int burst)
{
        union cvmx_pko_mem_port_rate0 pko_mem_port_rate0;
        union cvmx_pko_mem_port_rate1 pko_mem_port_rate1;

        pko_mem_port_rate0.u64 = 0;
        pko_mem_port_rate0.s.pid = port;
        pko_mem_port_rate0.s.rate_pkt =
            cvmx_sysinfo_get()->cpu_clock_hz / packets_s / 16;
        /* No cost per word since we are limited by packets/sec, not bits/sec */
        pko_mem_port_rate0.s.rate_word = 0;

        pko_mem_port_rate1.u64 = 0;
        pko_mem_port_rate1.s.pid = port;
        pko_mem_port_rate1.s.rate_lim =
            ((uint64_t) pko_mem_port_rate0.s.rate_pkt * burst) >> 8;

        cvmx_write_csr(CVMX_PKO_MEM_PORT_RATE0, pko_mem_port_rate0.u64);
        cvmx_write_csr(CVMX_PKO_MEM_PORT_RATE1, pko_mem_port_rate1.u64);
        return 0;
}

/**
 * Rate limit a PKO port to a max bits/sec. This function is only
 * supported on CN51XX and higher, excluding CN58XX.
 *
 * @port:   Port to rate limit
 * @bits_s: PKO rate limit in bits/sec
 * @burst:  Maximum number of bits to burst before rate
 *               limiting cuts in.
 *
 * Returns Zero on success, negative on failure
 */
int cvmx_pko_rate_limit_bits(int port, uint64_t bits_s, int burst)
{
        union cvmx_pko_mem_port_rate0 pko_mem_port_rate0;
        union cvmx_pko_mem_port_rate1 pko_mem_port_rate1;
        uint64_t clock_rate = cvmx_sysinfo_get()->cpu_clock_hz;
        uint64_t tokens_per_bit = clock_rate * 16 / bits_s;

        pko_mem_port_rate0.u64 = 0;
        pko_mem_port_rate0.s.pid = port;
        /*
         * Each packet has a 12 bytes of interframe gap, an 8 byte
         * preamble, and a 4 byte CRC. These are not included in the
         * per word count. Multiply by 8 to covert to bits and divide
         * by 256 for limit granularity.
         */
        pko_mem_port_rate0.s.rate_pkt = (12 + 8 + 4) * 8 * tokens_per_bit / 256;
        /* Each 8 byte word has 64bits */
        pko_mem_port_rate0.s.rate_word = 64 * tokens_per_bit;

        pko_mem_port_rate1.u64 = 0;
        pko_mem_port_rate1.s.pid = port;
        pko_mem_port_rate1.s.rate_lim = tokens_per_bit * burst / 256;

        cvmx_write_csr(CVMX_PKO_MEM_PORT_RATE0, pko_mem_port_rate0.u64);
        cvmx_write_csr(CVMX_PKO_MEM_PORT_RATE1, pko_mem_port_rate1.u64);
        return 0;
}