mirror of
https://github.com/riscv-software-src/opensbi
synced 2025-11-04 05:50:22 +00:00
998ed43fde
Instead of having FDT i2c adapter driver list hard-coded in the C source, we generate it using carray.sh at compile-time. Signed-off-by: Anup Patel <apatel@ventanamicro.com> Reviewed-by: Atish Patra <atishp@rivosinc.com>
87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 YADRO
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*
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* Authors:
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* Nikita Shubin <n.shubin@yadro.com>
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*
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* derivate: lib/utils/gpio/fdt_gpio.c
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#include <libfdt.h>
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#include <sbi/sbi_error.h>
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#include <sbi_utils/fdt/fdt_helper.h>
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#include <sbi_utils/i2c/fdt_i2c.h>
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/* List of FDT i2c adapter drivers generated at compile time */
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extern struct fdt_i2c_adapter *fdt_i2c_adapter_drivers[];
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extern unsigned long fdt_i2c_adapter_drivers_size;
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static int fdt_i2c_adapter_init(void *fdt, int nodeoff)
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{
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int pos, rc;
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struct fdt_i2c_adapter *drv;
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const struct fdt_match *match;
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/* Try all I2C drivers one-by-one */
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for (pos = 0; pos < fdt_i2c_adapter_drivers_size; pos++) {
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drv = fdt_i2c_adapter_drivers[pos];
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match = fdt_match_node(fdt, nodeoff, drv->match_table);
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if (match && drv->init) {
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rc = drv->init(fdt, nodeoff, match);
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if (rc == SBI_ENODEV)
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continue;
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if (rc)
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return rc;
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return 0;
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}
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}
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return SBI_ENOSYS;
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}
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static int fdt_i2c_adapter_find(void *fdt, int nodeoff,
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struct i2c_adapter **out_adapter)
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{
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int rc;
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struct i2c_adapter *adapter = i2c_adapter_find(nodeoff);
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if (!adapter) {
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/* I2C adapter not found so initialize matching driver */
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rc = fdt_i2c_adapter_init(fdt, nodeoff);
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if (rc)
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return rc;
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/* Try to find I2C adapter again */
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adapter = i2c_adapter_find(nodeoff);
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if (!adapter)
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return SBI_ENOSYS;
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}
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if (out_adapter)
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*out_adapter = adapter;
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return 0;
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}
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int fdt_i2c_adapter_get(void *fdt, int nodeoff,
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struct i2c_adapter **out_adapter)
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{
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int rc;
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struct i2c_adapter *adapter;
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if (!fdt || (nodeoff < 0) || !out_adapter)
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return SBI_EINVAL;
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rc = fdt_i2c_adapter_find(fdt, nodeoff, &adapter);
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if (rc)
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return rc;
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*out_adapter = adapter;
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return 0;
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}
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