ck505.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <assert.h>
#include <console/console.h>
#include <device/device.h>
#include <device/smbus.h>
#include "chip.h"
 
#define SMBUS_BLOCK_SIZE 32
 
static void ck505_init(struct device *dev)
{
        struct drivers_i2c_ck505_config *config;
        int dev_nregs, nregs;
        u8 block[SMBUS_BLOCK_SIZE];
        int i;
 
        if (!dev->enabled || dev->path.type != DEVICE_PATH_I2C)
                return;
 
        config = dev->chip_info;
 
        dev_nregs = smbus_block_read(dev, 0, sizeof(block), block);
 
        if (dev_nregs < 0) {
                printk(BIOS_ERR, "Failed reading ck505 configuration!\n");
                return;
        }
 
        /* This means that the devicetree doesn't have to specify nregs */
        nregs = MIN(MIN(dev_nregs, config->nregs == 0 ? SMBUS_BLOCK_SIZE
                                : config->nregs), ARRAY_SIZE(config->mask));
 
        printk(BIOS_DEBUG, "Changing %d of the %d ck505 config bytes.\n",
                nregs, dev_nregs);
 
        assert(ARRAY_SIZE(config->mask) == ARRAY_SIZE(config->regs));
 
        for (i = 0; i < nregs && i < SMBUS_BLOCK_SIZE; i++)
                block[i] = (block[i] & ~config->mask[i]) | config->regs[i];
 
        if (smbus_block_write(dev, 0, dev_nregs, block) < 0)
                printk(BIOS_ERR, "Failed writing ck505 configuration!\n");
}
 
static struct device_operations ck505_operations = {
        .read_resources         = noop_read_resources,
        .set_resources          = noop_set_resources,
        .init                   = ck505_init,
};
 
static void enable_dev(struct device *dev)
{
        dev->ops = &ck505_operations;
}
 
struct chip_operations drivers_i2c_ck505_ops = {
        CHIP_NAME("CK505 Clock generator")
        .enable_dev = enable_dev,
};