| Simon Glass | 8c74a57 | 2014-11-14 18:18:34 -0700 | [diff] [blame] | 1 | /* |
| 2 | * From Coreboot |
| 3 | * Copyright (C) 2008-2009 coresystems GmbH |
| 4 | * Copyright (C) 2012 The Chromium OS Authors. |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0 |
| 7 | */ |
| 8 | |
| 9 | #include <common.h> |
| 10 | #include <asm/io.h> |
| 11 | #include <asm/pci.h> |
| 12 | #include <asm/arch/pch.h> |
| 13 | |
| 14 | static int pch_revision_id = -1; |
| 15 | static int pch_type = -1; |
| 16 | |
| 17 | int pch_silicon_revision(void) |
| 18 | { |
| 19 | pci_dev_t dev; |
| 20 | |
| 21 | dev = PCH_LPC_DEV; |
| 22 | |
| 23 | if (pch_revision_id < 0) |
| 24 | pch_revision_id = pci_read_config8(dev, PCI_REVISION_ID); |
| 25 | return pch_revision_id; |
| 26 | } |
| 27 | |
| 28 | int pch_silicon_type(void) |
| 29 | { |
| 30 | pci_dev_t dev; |
| 31 | |
| 32 | dev = PCH_LPC_DEV; |
| 33 | |
| 34 | if (pch_type < 0) |
| 35 | pch_type = pci_read_config8(dev, PCI_DEVICE_ID + 1); |
| 36 | return pch_type; |
| 37 | } |
| 38 | |
| 39 | int pch_silicon_supported(int type, int rev) |
| 40 | { |
| 41 | int cur_type = pch_silicon_type(); |
| 42 | int cur_rev = pch_silicon_revision(); |
| 43 | |
| 44 | switch (type) { |
| 45 | case PCH_TYPE_CPT: |
| 46 | /* CougarPoint minimum revision */ |
| 47 | if (cur_type == PCH_TYPE_CPT && cur_rev >= rev) |
| 48 | return 1; |
| 49 | /* PantherPoint any revision */ |
| 50 | if (cur_type == PCH_TYPE_PPT) |
| 51 | return 1; |
| 52 | break; |
| 53 | |
| 54 | case PCH_TYPE_PPT: |
| 55 | /* PantherPoint minimum revision */ |
| 56 | if (cur_type == PCH_TYPE_PPT && cur_rev >= rev) |
| 57 | return 1; |
| 58 | break; |
| 59 | } |
| 60 | |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | #define IOBP_RETRY 1000 |
| 65 | static inline int iobp_poll(void) |
| 66 | { |
| 67 | unsigned try = IOBP_RETRY; |
| 68 | u32 data; |
| 69 | |
| 70 | while (try--) { |
| 71 | data = readl(RCB_REG(IOBPS)); |
| 72 | if ((data & 1) == 0) |
| 73 | return 1; |
| 74 | udelay(10); |
| 75 | } |
| 76 | |
| 77 | printf("IOBP timeout\n"); |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | void pch_iobp_update(u32 address, u32 andvalue, u32 orvalue) |
| 82 | { |
| 83 | u32 data; |
| 84 | |
| 85 | /* Set the address */ |
| 86 | writel(address, RCB_REG(IOBPIRI)); |
| 87 | |
| 88 | /* READ OPCODE */ |
| 89 | if (pch_silicon_supported(PCH_TYPE_CPT, PCH_STEP_B0)) |
| 90 | writel(IOBPS_RW_BX, RCB_REG(IOBPS)); |
| 91 | else |
| 92 | writel(IOBPS_READ_AX, RCB_REG(IOBPS)); |
| 93 | if (!iobp_poll()) |
| 94 | return; |
| 95 | |
| 96 | /* Read IOBP data */ |
| 97 | data = readl(RCB_REG(IOBPD)); |
| 98 | if (!iobp_poll()) |
| 99 | return; |
| 100 | |
| 101 | /* Check for successful transaction */ |
| 102 | if ((readl(RCB_REG(IOBPS)) & 0x6) != 0) { |
| 103 | printf("IOBP read 0x%08x failed\n", address); |
| 104 | return; |
| 105 | } |
| 106 | |
| 107 | /* Update the data */ |
| 108 | data &= andvalue; |
| 109 | data |= orvalue; |
| 110 | |
| 111 | /* WRITE OPCODE */ |
| 112 | if (pch_silicon_supported(PCH_TYPE_CPT, PCH_STEP_B0)) |
| 113 | writel(IOBPS_RW_BX, RCB_REG(IOBPS)); |
| 114 | else |
| 115 | writel(IOBPS_WRITE_AX, RCB_REG(IOBPS)); |
| 116 | if (!iobp_poll()) |
| 117 | return; |
| 118 | |
| 119 | /* Write IOBP data */ |
| 120 | writel(data, RCB_REG(IOBPD)); |
| 121 | if (!iobp_poll()) |
| 122 | return; |
| 123 | } |