src/southbridge/intel/common/smbus_ops.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <device/device.h>
   4 #include <device/smbus.h>
   5 #include <device/pci.h>
   6 #include <device/pci_ids.h>
   7 #include <device/smbus_host.h>
   8 #include <southbridge/intel/common/smbus_ops.h>
   9
  10 static int lsmbus_read_byte(struct device *dev, u8 address)
  11 {
  12         u16 device;
  13         struct resource *res;
  14         struct bus *pbus;
  15
  16         device = dev->path.i2c.device;
  17         pbus = get_pbus_smbus(dev);
  18         res = find_resource(pbus->dev, PCI_BASE_ADDRESS_4);
  19
  20         return do_smbus_read_byte(res->base, device, address);
  21 }
  22
  23 static int lsmbus_write_byte(struct device *dev, u8 address, u8 data)
  24 {
  25         u16 device;
  26         struct resource *res;
  27         struct bus *pbus;
  28
  29         device = dev->path.i2c.device;
  30         pbus = get_pbus_smbus(dev);
  31         res = find_resource(pbus->dev, PCI_BASE_ADDRESS_4);
  32         return do_smbus_write_byte(res->base, device, address, data);
  33 }
  34
  35 static int lsmbus_block_write(struct device *dev, u8 cmd, u8 bytes, const u8 *buf)
  36 {
  37         u16 device;
  38         struct resource *res;
  39         struct bus *pbus;
  40
  41         device = dev->path.i2c.device;
  42         pbus = get_pbus_smbus(dev);
  43         res = find_resource(pbus->dev, PCI_BASE_ADDRESS_4);
  44         return do_smbus_block_write(res->base, device, cmd, bytes, buf);
  45 }
  46
  47 static int lsmbus_block_read(struct device *dev, u8 cmd, u8 bytes, u8 *buf)
  48 {
  49         u16 device;
  50         struct resource *res;
  51         struct bus *pbus;
  52
  53         device = dev->path.i2c.device;
  54         pbus = get_pbus_smbus(dev);
  55         res = find_resource(pbus->dev, PCI_BASE_ADDRESS_4);
  56         return do_smbus_block_read(res->base, device, cmd, bytes, buf);
  57 }
  58
  59 struct smbus_bus_operations lops_smbus_bus = {
  60         .read_byte      = lsmbus_read_byte,
  61         .write_byte     = lsmbus_write_byte,
  62         .block_read     = lsmbus_block_read,
  63         .block_write    = lsmbus_block_write,
  64 };
  65
  66 void smbus_read_resources(struct device *dev)
  67 {
  68         pci_dev_read_resources(dev);
  69
  70         struct resource *res = new_resource(dev, PCI_BASE_ADDRESS_4);
  71         res->base = CONFIG_FIXED_SMBUS_IO_BASE;
  72         res->size = 32;
  73         res->limit = res->base + res->size - 1;
  74         res->flags = IORESOURCE_IO | IORESOURCE_FIXED | IORESOURCE_RESERVE |
  75                      IORESOURCE_STORED | IORESOURCE_ASSIGNED;
  76 }