John Zhao | 41aa8d6 | 2022-01-20 11:29:18 -0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | |
| 3 | #define __SIMPLE_DEVICE__ |
| 4 | |
| 5 | #include <console/console.h> |
| 6 | #include <device/pci.h> |
| 7 | #include <device/pci_ids.h> |
| 8 | #include <intelblocks/p2sb.h> |
| 9 | #include <intelblocks/p2sblib.h> |
| 10 | #include <intelblocks/pcr.h> |
| 11 | #include <soc/pci_devs.h> |
| 12 | |
| 13 | bool p2sb_dev_is_hidden(pci_devfn_t dev) |
| 14 | { |
| 15 | const uint16_t pci_vid = pci_read_config16(dev, PCI_VENDOR_ID); |
| 16 | |
| 17 | if (pci_vid == 0xffff) |
| 18 | return true; |
| 19 | if (pci_vid == PCI_VENDOR_ID_INTEL) |
| 20 | return false; |
| 21 | printk(BIOS_ERR, "P2SB PCI_VENDOR_ID is invalid, unknown if hidden\n"); |
| 22 | return true; |
| 23 | } |
| 24 | |
| 25 | static void p2sb_dev_set_hide_bit(pci_devfn_t dev, int hide) |
| 26 | { |
| 27 | const uint16_t reg = P2SBC + 1; |
| 28 | const uint8_t mask = P2SBC_HIDE_BIT; |
| 29 | uint8_t val; |
| 30 | |
| 31 | val = pci_read_config8(dev, reg); |
| 32 | val &= ~mask; |
| 33 | if (hide) |
| 34 | val |= mask; |
| 35 | pci_write_config8(dev, reg, val); |
| 36 | } |
| 37 | |
| 38 | void p2sb_dev_unhide(pci_devfn_t dev) |
| 39 | { |
| 40 | p2sb_dev_set_hide_bit(dev, 0); |
| 41 | |
| 42 | if (p2sb_dev_is_hidden(dev)) |
| 43 | die_with_post_code(POST_HW_INIT_FAILURE, |
| 44 | "Unable to unhide the P2SB device!\n"); |
| 45 | } |
| 46 | |
| 47 | void p2sb_dev_hide(pci_devfn_t dev) |
| 48 | { |
| 49 | p2sb_dev_set_hide_bit(dev, 1); |
| 50 | |
| 51 | if (!p2sb_dev_is_hidden(dev)) |
| 52 | die_with_post_code(POST_HW_INIT_FAILURE, |
| 53 | "Unable to hide the P2SB device!\n"); |
| 54 | } |
| 55 | |
| 56 | static void p2sb_execute_sideband_access(pci_devfn_t dev, uint8_t cmd, uint8_t pid, |
| 57 | uint16_t reg, uint32_t *data) |
| 58 | { |
| 59 | struct pcr_sbi_msg msg = { |
| 60 | .pid = pid, |
| 61 | .offset = reg, |
| 62 | .opcode = cmd, |
| 63 | .is_posted = false, |
| 64 | .fast_byte_enable = 0xF, |
| 65 | .bar = 0, |
| 66 | .fid = 0 |
| 67 | }; |
| 68 | uint8_t response; |
| 69 | int status; |
| 70 | |
| 71 | /* Unhide the P2SB device */ |
| 72 | p2sb_dev_unhide(dev); |
| 73 | |
| 74 | status = pcr_execute_sideband_msg(dev, &msg, data, &response); |
| 75 | if (status || response) |
| 76 | printk(BIOS_ERR, "Fail to execute p2sb sideband access\n"); |
| 77 | |
| 78 | /* Hide the P2SB device */ |
| 79 | p2sb_dev_hide(dev); |
| 80 | } |
| 81 | |
| 82 | uint32_t p2sb_dev_sbi_read(pci_devfn_t dev, uint8_t pid, uint16_t reg) |
| 83 | { |
| 84 | uint32_t val = 0; |
| 85 | p2sb_execute_sideband_access(dev, PCR_READ, pid, reg, &val); |
| 86 | return val; |
| 87 | } |
| 88 | |
| 89 | void p2sb_dev_sbi_write(pci_devfn_t dev, uint8_t pid, uint16_t reg, uint32_t val) |
| 90 | { |
| 91 | p2sb_execute_sideband_access(dev, PCR_WRITE, pid, reg, &val); |
| 92 | } |