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https://github.com/AsahiLinux/u-boot
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fa11fe1b03
Allow this driver to set up an IO address in SPL using an 'early-regs' property. This allows SPL to use the I2C driver without having to enable the full PCI stack. Also split out ofdata_to_platdata in designware driver since this is more correct, and more convenient for the new logic. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2009
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* Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
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* Copyright 2019 Google Inc
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*/
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#include <common.h>
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#include <dm.h>
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#include <spl.h>
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#include "designware_i2c.h"
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/* BayTrail HCNT/LCNT/SDA hold time */
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static struct dw_scl_sda_cfg byt_config = {
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.ss_hcnt = 0x200,
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.fs_hcnt = 0x55,
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.ss_lcnt = 0x200,
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.fs_lcnt = 0x99,
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.sda_hold = 0x6,
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};
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static int designware_i2c_pci_ofdata_to_platdata(struct udevice *dev)
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{
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struct dw_i2c *priv = dev_get_priv(dev);
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if (spl_phase() < PHASE_SPL) {
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u32 base;
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int ret;
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ret = dev_read_u32(dev, "early-regs", &base);
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if (ret)
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return log_msg_ret("early-regs", ret);
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/* Set i2c base address */
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dm_pci_write_config32(dev, PCI_BASE_ADDRESS_0, base);
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/* Enable memory access and bus master */
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dm_pci_write_config32(dev, PCI_COMMAND, PCI_COMMAND_MEMORY |
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PCI_COMMAND_MASTER);
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}
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if (spl_phase() < PHASE_BOARD_F) {
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/* Handle early, fixed mapping into a different address space */
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priv->regs = (struct i2c_regs *)dm_pci_read_bar32(dev, 0);
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} else {
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priv->regs = (struct i2c_regs *)
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dm_pci_map_bar(dev, PCI_BASE_ADDRESS_0, PCI_REGION_MEM);
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}
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if (!priv->regs)
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return -EINVAL;
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/* Save base address from PCI BAR */
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if (IS_ENABLED(CONFIG_INTEL_BAYTRAIL))
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/* Use BayTrail specific timing values */
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priv->scl_sda_cfg = &byt_config;
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return 0;
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}
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static int designware_i2c_pci_probe(struct udevice *dev)
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{
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return designware_i2c_probe(dev);
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}
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static int designware_i2c_pci_bind(struct udevice *dev)
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{
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char name[20];
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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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* Setting req_seq in the driver is probably not recommended.
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* But without a DT alias the number is not configured. And
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* using this driver is impossible for PCIe I2C devices.
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* This can be removed, once a better (correct) way for this
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* is found and implemented.
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*
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* TODO(sjg@chromium.org): Perhaps if uclasses had platdata this would
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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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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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static const struct udevice_id designware_i2c_pci_ids[] = {
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{ .compatible = "snps,designware-i2c-pci" },
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{ }
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};
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U_BOOT_DRIVER(i2c_designware_pci) = {
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.name = "i2c_designware_pci",
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.id = UCLASS_I2C,
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.of_match = designware_i2c_pci_ids,
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.bind = designware_i2c_pci_bind,
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.ofdata_to_platdata = designware_i2c_pci_ofdata_to_platdata,
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.probe = designware_i2c_pci_probe,
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.priv_auto_alloc_size = sizeof(struct dw_i2c),
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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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};
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static struct pci_device_id designware_pci_supported[] = {
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/* Intel BayTrail has 7 I2C controller located on the PCI bus */
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{ PCI_VDEVICE(INTEL, 0x0f41) },
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{ PCI_VDEVICE(INTEL, 0x0f42) },
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{ PCI_VDEVICE(INTEL, 0x0f43) },
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{ PCI_VDEVICE(INTEL, 0x0f44) },
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{ PCI_VDEVICE(INTEL, 0x0f45) },
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{ PCI_VDEVICE(INTEL, 0x0f46) },
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{ PCI_VDEVICE(INTEL, 0x0f47) },
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{},
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};
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U_BOOT_PCI_DEVICE(i2c_designware_pci, designware_pci_supported);
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