8d6bb37f5c483c9522afb19e76ebe30444d61adf
[oweals/u-boot.git] / drivers / i2c / designware_i2c_pci.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2009
4  * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
5  * Copyright 2019 Google Inc
6  */
7
8 #include <common.h>
9 #include <dm.h>
10 #include "designware_i2c.h"
11
12 /* BayTrail HCNT/LCNT/SDA hold time */
13 static struct dw_scl_sda_cfg byt_config = {
14         .ss_hcnt = 0x200,
15         .fs_hcnt = 0x55,
16         .ss_lcnt = 0x200,
17         .fs_lcnt = 0x99,
18         .sda_hold = 0x6,
19 };
20
21 static int designware_i2c_pci_probe(struct udevice *dev)
22 {
23         struct dw_i2c *priv = dev_get_priv(dev);
24
25         /* Save base address from PCI BAR */
26         priv->regs = (struct i2c_regs *)
27                 dm_pci_map_bar(dev, PCI_BASE_ADDRESS_0, PCI_REGION_MEM);
28         if (IS_ENABLED(CONFIG_INTEL_BAYTRAIL))
29                 /* Use BayTrail specific timing values */
30                 priv->scl_sda_cfg = &byt_config;
31
32         return designware_i2c_probe(dev);
33 }
34
35 static int designware_i2c_pci_bind(struct udevice *dev)
36 {
37         char name[20];
38
39         /*
40          * Create a unique device name for PCI type devices
41          * ToDo:
42          * Setting req_seq in the driver is probably not recommended.
43          * But without a DT alias the number is not configured. And
44          * using this driver is impossible for PCIe I2C devices.
45          * This can be removed, once a better (correct) way for this
46          * is found and implemented.
47          *
48          * TODO(sjg@chromium.org): Perhaps if uclasses had platdata this would
49          * be possible. We cannot use static data in drivers since they may be
50          * used in SPL or before relocation.
51          */
52         dev->req_seq = gd->arch.dw_i2c_num_cards++;
53         sprintf(name, "i2c_designware#%u", dev->req_seq);
54         device_set_name(dev, name);
55
56         return 0;
57 }
58
59 U_BOOT_DRIVER(i2c_designware_pci) = {
60         .name   = "i2c_designware_pci",
61         .id     = UCLASS_I2C,
62         .bind   = designware_i2c_pci_bind,
63         .probe  = designware_i2c_pci_probe,
64         .priv_auto_alloc_size = sizeof(struct dw_i2c),
65         .remove = designware_i2c_remove,
66         .flags = DM_FLAG_OS_PREPARE,
67         .ops    = &designware_i2c_ops,
68 };
69
70 static struct pci_device_id designware_pci_supported[] = {
71         /* Intel BayTrail has 7 I2C controller located on the PCI bus */
72         { PCI_VDEVICE(INTEL, 0x0f41) },
73         { PCI_VDEVICE(INTEL, 0x0f42) },
74         { PCI_VDEVICE(INTEL, 0x0f43) },
75         { PCI_VDEVICE(INTEL, 0x0f44) },
76         { PCI_VDEVICE(INTEL, 0x0f45) },
77         { PCI_VDEVICE(INTEL, 0x0f46) },
78         { PCI_VDEVICE(INTEL, 0x0f47) },
79         {},
80 };
81
82 U_BOOT_PCI_DEVICE(i2c_designware_pci, designware_pci_supported);