// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2016
 * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
 *
 * (C) Copyright 2017, 2018
 * Mario Six,  Guntermann & Drunck GmbH, mario.six@gdsys.cc
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>
#include <axi.h>
#include <command.h>
#include <console.h>
#include <dm.h>
#include <log.h>

/* Currently selected AXI bus device */
static struct udevice *axi_cur_bus;
/* Transmission size from last command */
static uint dp_last_size;
/* Address from last command */
static uint dp_last_addr;
/* Number of bytes to display from last command; default = 64 */
static uint dp_last_length = 0x40;

/**
 * show_bus() - Show devices on a single AXI bus
 * @bus: The AXI bus device to printt information for
 */
static void show_bus(struct udevice *bus)
{
        struct udevice *dev;

        printf("Bus %d:\t%s", bus->req_seq, bus->name);
        if (device_active(bus))
                printf("  (active %d)", bus->seq);
        printf("\n");
        for (device_find_first_child(bus, &dev);
             dev;
             device_find_next_child(&dev))
                printf("  %s\n", dev->name);
}

/**
 * axi_set_cur_bus() - Set the currently active AXI bus
 * @busnum: The number of the bus (i.e. its sequence number) that should be
 *          made active
 *
 * The operations supplied by this command operate only on the currently active
 * bus.
 *
 * Return: 0 if OK, -ve on error
 */
static int axi_set_cur_bus(unsigned int busnum)
{
        struct udevice *bus;
        struct udevice *dummy;
        int ret;

        /* Make sure that all sequence numbers are initialized */
        for (uclass_first_device(UCLASS_AXI, &dummy);
             dummy;
             uclass_next_device(&dummy))
                ;

        ret = uclass_get_device_by_seq(UCLASS_AXI, busnum, &bus);
        if (ret) {
                debug("%s: No bus %d\n", __func__, busnum);
                return ret;
        }
        axi_cur_bus = bus;

        return 0;
}

/**
 * axi_get_cur_bus() - Retrieve the currently active AXI bus device
 * @busp: Pointer to a struct udevice that receives the currently active bus
 *        device
 *
 * Return: 0 if OK, -ve on error
 */
static int axi_get_cur_bus(struct udevice **busp)
{
        if (!axi_cur_bus) {
                puts("No AXI bus selected\n");
                return -ENODEV;
        }
        *busp = axi_cur_bus;

        return 0;
}

/*
 * Command handlers
 */

static int do_axi_show_bus(struct cmd_tbl *cmdtp, int flag, int argc,
                           char *const argv[])
{
        struct udevice *dummy;

        /* Make sure that all sequence numbers are initialized */
        for (uclass_first_device(UCLASS_AXI, &dummy);
             dummy;
             uclass_next_device(&dummy))
                ;

        if (argc == 1) {
                /* show all busses */
                struct udevice *bus;

                for (uclass_first_device(UCLASS_AXI, &bus);
                     bus;
                     uclass_next_device(&bus))
                        show_bus(bus);
        } else {
                int i;

                /* show specific bus */
                i = simple_strtoul(argv[1], NULL, 10);

                struct udevice *bus;
                int ret;

                ret = uclass_get_device_by_seq(UCLASS_AXI, i, &bus);
                if (ret) {
                        printf("Invalid bus %d: err=%d\n", i, ret);
                        return CMD_RET_FAILURE;
                }
                show_bus(bus);
        }

        return 0;
}

static int do_axi_bus_num(struct cmd_tbl *cmdtp, int flag, int argc,
                          char *const argv[])
{
        int ret = 0;
        int bus_no;

        if (argc == 1) {
                /* querying current setting */
                struct udevice *bus;

                if (!axi_get_cur_bus(&bus))
                        bus_no = bus->seq;
                else
                        bus_no = -1;

                printf("Current bus is %d\n", bus_no);
        } else {
                bus_no = simple_strtoul(argv[1], NULL, 10);
                printf("Setting bus to %d\n", bus_no);

                ret = axi_set_cur_bus(bus_no);
                if (ret)
                        printf("Failure changing bus number (%d)\n", ret);
        }

        return ret ? CMD_RET_FAILURE : 0;
}

static int do_axi_md(struct cmd_tbl *cmdtp, int flag, int argc,
                     char *const argv[])
{
        /* Print that many bytes per line */
        const uint DISP_LINE_LEN = 16;
        u8 linebuf[DISP_LINE_LEN];
        unsigned int k;
        ulong addr, length, size;
        ulong nbytes;
        enum axi_size_t axisize;
        int unitsize;

        /*
         * We use the last specified parameters, unless new ones are
         * entered.
         */
        size = dp_last_size;
        addr = dp_last_addr;
        length = dp_last_length;

        if (argc < 3)
                return CMD_RET_USAGE;

        if (!axi_cur_bus) {
                puts("No AXI bus selected\n");
                return CMD_RET_FAILURE;
        }

        if ((flag & CMD_FLAG_REPEAT) == 0) {
                size = simple_strtoul(argv[1], NULL, 10);

                /*
                 * Address is specified since argc >= 3
                 */
                addr = simple_strtoul(argv[2], NULL, 16);

                /*
                 * If there's another parameter, it is the length to display;
                 * length is the number of objects, not number of bytes
                 */
                if (argc > 3)
                        length = simple_strtoul(argv[3], NULL, 16);
        }

        switch (size) {
        case 8:
                axisize = AXI_SIZE_8;
                unitsize = 1;
                break;
        case 16:
                axisize = AXI_SIZE_16;
                unitsize = 2;
                break;
        case 32:
                axisize = AXI_SIZE_32;
                unitsize = 4;
                break;
        default:
                printf("Unknown read size '%lu'\n", size);
                return CMD_RET_USAGE;
        };

        nbytes = length * unitsize;
        do {
                ulong linebytes = (nbytes > DISP_LINE_LEN) ?
                                  DISP_LINE_LEN : nbytes;

                for (k = 0; k < linebytes / unitsize; ++k) {
                        int ret = axi_read(axi_cur_bus, addr + k * unitsize,
                                           linebuf + k * unitsize, axisize);

                        if (!ret) /* Continue if axi_read was successful */
                                continue;

                        if (ret == -ENOSYS)
                                printf("axi_read failed; read size not supported?\n");
                        else
                                printf("axi_read failed: err = %d\n", ret);

                        return CMD_RET_FAILURE;
                }
                print_buffer(addr, (void *)linebuf, unitsize,
                             linebytes / unitsize,
                             DISP_LINE_LEN / unitsize);

                nbytes -= max(linebytes, 1UL);
                addr += linebytes;

                if (ctrlc())
                        break;
        } while (nbytes > 0);

        dp_last_size = size;
        dp_last_addr = addr;
        dp_last_length = length;

        return 0;
}

static int do_axi_mw(struct cmd_tbl *cmdtp, int flag, int argc,
                     char *const argv[])
{
        u32 writeval;
        ulong addr, count, size;
        enum axi_size_t axisize;

        if (argc <= 3 || argc >= 6)
                return CMD_RET_USAGE;

        size = simple_strtoul(argv[1], NULL, 10);

        switch (size) {
        case 8:
                axisize = AXI_SIZE_8;
                break;
        case 16:
                axisize = AXI_SIZE_16;
                break;
        case 32:
                axisize = AXI_SIZE_32;
                break;
        default:
                printf("Unknown write size '%lu'\n", size);
                return CMD_RET_USAGE;
        };

        /* Address is specified since argc > 4 */
        addr = simple_strtoul(argv[2], NULL, 16);

        /* Get the value to write */
        writeval = simple_strtoul(argv[3], NULL, 16);

        /* Count ? */
        if (argc == 5)
                count = simple_strtoul(argv[4], NULL, 16);
        else
                count = 1;

        while (count-- > 0) {
                int ret = axi_write(axi_cur_bus, addr + count * sizeof(u32),
                                    &writeval, axisize);

                if (ret) {
                        printf("axi_write failed: err = %d\n", ret);
                        return CMD_RET_FAILURE;
                }
        }

        return 0;
}

static struct cmd_tbl cmd_axi_sub[] = {
        U_BOOT_CMD_MKENT(bus, 1, 1, do_axi_show_bus, "", ""),
        U_BOOT_CMD_MKENT(dev, 1, 1, do_axi_bus_num, "", ""),
        U_BOOT_CMD_MKENT(md, 4, 1, do_axi_md, "", ""),
        U_BOOT_CMD_MKENT(mw, 5, 1, do_axi_mw, "", ""),
};

static int do_ihs_axi(struct cmd_tbl *cmdtp, int flag, int argc,
                      char *const argv[])
{
        struct cmd_tbl *c;

        if (argc < 2)
                return CMD_RET_USAGE;

        /* Strip off leading 'axi' command argument */
        argc--;
        argv++;

        /* Hand off rest of command line to sub-commands */
        c = find_cmd_tbl(argv[0], &cmd_axi_sub[0], ARRAY_SIZE(cmd_axi_sub));

        if (c)
                return c->cmd(cmdtp, flag, argc, argv);
        else
                return CMD_RET_USAGE;
}

static char axi_help_text[] =
        "bus  - show AXI bus info\n"
        "axi dev [bus] - show or set current AXI bus to bus number [bus]\n"
        "axi md size addr [# of objects] - read from AXI device at address [addr] and data width [size] (one of 8, 16, 32)\n"
        "axi mw size addr value [count] - write data [value] to AXI device at address [addr] and data width [size] (one of 8, 16, 32)\n";

U_BOOT_CMD(axi, 7, 1, do_ihs_axi,
           "AXI sub-system",
           axi_help_text
);