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@@ -9,7 +9,12 @@
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#include <dm.h>
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#include <log.h>
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#include <spl.h>
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+#include <acpi/acpigen.h>
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+#include <acpi/acpi_device.h>
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#include <asm/lpss.h>
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+#include <dm/acpi.h>
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+#include <dm/device-internal.h>
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+#include <dm/uclass-internal.h>
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#include "designware_i2c.h"
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enum {
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@@ -87,6 +92,9 @@ static int designware_i2c_pci_bind(struct udevice *dev)
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{
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char name[20];
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+ if (dev_of_valid(dev))
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+ return 0;
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+
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/*
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* Create a unique device name for PCI type devices
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* ToDo:
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@@ -100,13 +108,98 @@ static int designware_i2c_pci_bind(struct udevice *dev)
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* be possible. We cannot use static data in drivers since they may be
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* used in SPL or before relocation.
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*/
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- dev->req_seq = gd->arch.dw_i2c_num_cards++;
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+ dev->req_seq = uclass_find_next_free_req_seq(UCLASS_I2C);
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sprintf(name, "i2c_designware#%u", dev->req_seq);
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device_set_name(dev, name);
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return 0;
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}
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+/*
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+ * Write ACPI object to describe speed configuration.
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+ *
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+ * ACPI Object: Name ("xxxx", Package () { scl_lcnt, scl_hcnt, sda_hold }
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+ *
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+ * SSCN: I2C_SPEED_STANDARD
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+ * FMCN: I2C_SPEED_FAST
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+ * FPCN: I2C_SPEED_FAST_PLUS
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+ * HSCN: I2C_SPEED_HIGH
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+ */
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+static void dw_i2c_acpi_write_speed_config(struct acpi_ctx *ctx,
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+ struct dw_i2c_speed_config *config)
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+{
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+ switch (config->speed_mode) {
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+ case IC_SPEED_MODE_HIGH:
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+ acpigen_write_name(ctx, "HSCN");
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+ break;
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+ case IC_SPEED_MODE_FAST_PLUS:
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+ acpigen_write_name(ctx, "FPCN");
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+ break;
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+ case IC_SPEED_MODE_FAST:
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+ acpigen_write_name(ctx, "FMCN");
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+ break;
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+ case IC_SPEED_MODE_STANDARD:
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+ default:
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+ acpigen_write_name(ctx, "SSCN");
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+ }
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+
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+ /* Package () { scl_lcnt, scl_hcnt, sda_hold } */
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+ acpigen_write_package(ctx, 3);
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+ acpigen_write_word(ctx, config->scl_hcnt);
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+ acpigen_write_word(ctx, config->scl_lcnt);
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+ acpigen_write_dword(ctx, config->sda_hold);
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+ acpigen_pop_len(ctx);
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+}
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+
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+/*
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+ * Generate I2C timing information into the SSDT for the OS driver to consume,
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+ * optionally applying override values provided by the caller.
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+ */
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+static int dw_i2c_acpi_fill_ssdt(const struct udevice *dev,
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+ struct acpi_ctx *ctx)
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+{
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+ struct dw_i2c_speed_config config;
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+ char path[ACPI_PATH_MAX];
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+ u32 speeds[4];
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+ uint speed;
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+ int size;
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+ int ret;
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+
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+ /* If no device-tree node, ignore this since we assume it isn't used */
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+ if (!dev_of_valid(dev))
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+ return 0;
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+
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+ ret = acpi_device_path(dev, path, sizeof(path));
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+ if (ret)
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+ return log_msg_ret("path", ret);
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+
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+ size = dev_read_size(dev, "i2c,speeds");
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+ if (size < 0)
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+ return log_msg_ret("i2c,speeds", -EINVAL);
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+
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+ size /= sizeof(u32);
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+ if (size > ARRAY_SIZE(speeds))
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+ return log_msg_ret("array", -E2BIG);
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+
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+ ret = dev_read_u32_array(dev, "i2c,speeds", speeds, size);
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+ if (ret)
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+ return log_msg_ret("read", -E2BIG);
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+
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+ speed = dev_read_u32_default(dev, "clock-frequency", 100000);
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+ acpigen_write_scope(ctx, path);
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+ ret = dw_i2c_gen_speed_config(dev, speed, &config);
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+ if (ret)
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+ return log_msg_ret("config", ret);
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+ dw_i2c_acpi_write_speed_config(ctx, &config);
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+ acpigen_pop_len(ctx);
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+
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+ return 0;
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+}
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+
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+struct acpi_ops dw_i2c_acpi_ops = {
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+ .fill_ssdt = dw_i2c_acpi_fill_ssdt,
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+};
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+
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static const struct udevice_id designware_i2c_pci_ids[] = {
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{ .compatible = "snps,designware-i2c-pci" },
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{ .compatible = "intel,apl-i2c", .data = INTEL_APL },
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@@ -124,6 +217,7 @@ U_BOOT_DRIVER(i2c_designware_pci) = {
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.remove = designware_i2c_remove,
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.flags = DM_FLAG_OS_PREPARE,
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.ops = &designware_i2c_ops,
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+ ACPI_OPS_PTR(&dw_i2c_acpi_ops)
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};
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static struct pci_device_id designware_pci_supported[] = {
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