Angel Pons | 32859fc | 2020-04-02 23:48:27 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Stefan Reinauer | 00636b0 | 2012-04-04 00:08:51 +0200 | [diff] [blame] | 2 | |
Kyösti Mälkki | 54d6abd | 2013-06-19 23:05:00 +0300 | [diff] [blame] | 3 | #ifndef _PCI_MMIO_CFG_H |
| 4 | #define _PCI_MMIO_CFG_H |
| 5 | |
Kyösti Mälkki | 8fd78a6 | 2019-01-23 15:59:38 +0200 | [diff] [blame] | 6 | #include <stdint.h> |
Kyösti Mälkki | 13f6650 | 2019-03-03 08:01:05 +0200 | [diff] [blame] | 7 | #include <device/mmio.h> |
Kyösti Mälkki | 8fd78a6 | 2019-01-23 15:59:38 +0200 | [diff] [blame] | 8 | #include <device/pci_type.h> |
Kyösti Mälkki | 54d6abd | 2013-06-19 23:05:00 +0300 | [diff] [blame] | 9 | |
Kyösti Mälkki | d2cdfff | 2019-03-05 07:56:38 +0200 | [diff] [blame] | 10 | /* Using a unique datatype for MMIO writes makes the pointers to _not_ |
| 11 | * qualify for pointer aliasing with any other objects in memory. |
| 12 | * |
| 13 | * MMIO offset is a value originally derived from 'struct device *' |
| 14 | * in ramstage. For the compiler to not discard this MMIO offset value |
| 15 | * from CPU registers after any MMIO writes, -fstrict-aliasing has to |
| 16 | * be also set for the build. |
| 17 | * |
| 18 | * Bottom 12 bits (4 KiB) are reserved to address the registers of a |
| 19 | * single PCI function. Declare the bank as a union to avoid some casting |
| 20 | * in the functions below. |
| 21 | */ |
| 22 | union pci_bank { |
| 23 | uint8_t reg8[4096]; |
| 24 | uint16_t reg16[4096 / sizeof(uint16_t)]; |
| 25 | uint32_t reg32[4096 / sizeof(uint32_t)]; |
| 26 | }; |
| 27 | |
Nico Huber | e01e25d | 2021-10-14 18:22:30 +0200 | [diff] [blame] | 28 | #if CONFIG(MMCONF_SUPPORT) |
| 29 | |
| 30 | #if CONFIG_MMCONF_BASE_ADDRESS == 0 |
| 31 | #error "CONFIG_MMCONF_BASE_ADDRESS undefined!" |
| 32 | #endif |
| 33 | |
| 34 | #if CONFIG_MMCONF_BUS_NUMBER * MiB != CONFIG_MMCONF_LENGTH |
| 35 | #error "CONFIG_MMCONF_LENGTH does not correspond with CONFIG_MMCONF_BUS_NUMBER!" |
| 36 | #endif |
| 37 | |
| 38 | /* By not assigning this to CONFIG_MMCONF_BASE_ADDRESS here we |
| 39 | prevent some sub-optimal constant folding. */ |
| 40 | extern u8 *const pci_mmconf; |
| 41 | |
Kyösti Mälkki | d2cdfff | 2019-03-05 07:56:38 +0200 | [diff] [blame] | 42 | static __always_inline |
| 43 | volatile union pci_bank *pcicfg(pci_devfn_t dev) |
| 44 | { |
| 45 | return (void *)&pci_mmconf[PCI_DEVFN_OFFSET(dev)]; |
| 46 | } |
Stefan Reinauer | 00636b0 | 2012-04-04 00:08:51 +0200 | [diff] [blame] | 47 | |
Nico Huber | e01e25d | 2021-10-14 18:22:30 +0200 | [diff] [blame] | 48 | #endif |
| 49 | |
Nico Huber | f4f365f | 2021-10-14 18:16:39 +0200 | [diff] [blame] | 50 | /* |
| 51 | * Avoid name collisions as different stages have different signature |
| 52 | * for these functions. The _s_ stands for simple, fundamental IO or |
| 53 | * MMIO variant. |
| 54 | */ |
| 55 | |
Aaron Durbin | 75a62e7 | 2018-09-13 02:10:45 -0600 | [diff] [blame] | 56 | static __always_inline |
Nico Huber | f4f365f | 2021-10-14 18:16:39 +0200 | [diff] [blame] | 57 | uint8_t pci_s_read_config8(pci_devfn_t dev, uint16_t reg) |
Stefan Reinauer | 00636b0 | 2012-04-04 00:08:51 +0200 | [diff] [blame] | 58 | { |
Kyösti Mälkki | d2cdfff | 2019-03-05 07:56:38 +0200 | [diff] [blame] | 59 | return pcicfg(dev)->reg8[reg]; |
Stefan Reinauer | 00636b0 | 2012-04-04 00:08:51 +0200 | [diff] [blame] | 60 | } |
| 61 | |
Aaron Durbin | 75a62e7 | 2018-09-13 02:10:45 -0600 | [diff] [blame] | 62 | static __always_inline |
Nico Huber | f4f365f | 2021-10-14 18:16:39 +0200 | [diff] [blame] | 63 | uint16_t pci_s_read_config16(pci_devfn_t dev, uint16_t reg) |
Stefan Reinauer | 00636b0 | 2012-04-04 00:08:51 +0200 | [diff] [blame] | 64 | { |
Kyösti Mälkki | d2cdfff | 2019-03-05 07:56:38 +0200 | [diff] [blame] | 65 | return pcicfg(dev)->reg16[reg / sizeof(uint16_t)]; |
Stefan Reinauer | 00636b0 | 2012-04-04 00:08:51 +0200 | [diff] [blame] | 66 | } |
| 67 | |
Aaron Durbin | 75a62e7 | 2018-09-13 02:10:45 -0600 | [diff] [blame] | 68 | static __always_inline |
Nico Huber | f4f365f | 2021-10-14 18:16:39 +0200 | [diff] [blame] | 69 | uint32_t pci_s_read_config32(pci_devfn_t dev, uint16_t reg) |
Stefan Reinauer | 00636b0 | 2012-04-04 00:08:51 +0200 | [diff] [blame] | 70 | { |
Kyösti Mälkki | d2cdfff | 2019-03-05 07:56:38 +0200 | [diff] [blame] | 71 | return pcicfg(dev)->reg32[reg / sizeof(uint32_t)]; |
Stefan Reinauer | 00636b0 | 2012-04-04 00:08:51 +0200 | [diff] [blame] | 72 | } |
| 73 | |
Aaron Durbin | 75a62e7 | 2018-09-13 02:10:45 -0600 | [diff] [blame] | 74 | static __always_inline |
Nico Huber | f4f365f | 2021-10-14 18:16:39 +0200 | [diff] [blame] | 75 | void pci_s_write_config8(pci_devfn_t dev, uint16_t reg, uint8_t value) |
Stefan Reinauer | 00636b0 | 2012-04-04 00:08:51 +0200 | [diff] [blame] | 76 | { |
Kyösti Mälkki | d2cdfff | 2019-03-05 07:56:38 +0200 | [diff] [blame] | 77 | pcicfg(dev)->reg8[reg] = value; |
Stefan Reinauer | 00636b0 | 2012-04-04 00:08:51 +0200 | [diff] [blame] | 78 | } |
| 79 | |
Aaron Durbin | 75a62e7 | 2018-09-13 02:10:45 -0600 | [diff] [blame] | 80 | static __always_inline |
Nico Huber | f4f365f | 2021-10-14 18:16:39 +0200 | [diff] [blame] | 81 | void pci_s_write_config16(pci_devfn_t dev, uint16_t reg, uint16_t value) |
Stefan Reinauer | 00636b0 | 2012-04-04 00:08:51 +0200 | [diff] [blame] | 82 | { |
Kyösti Mälkki | d2cdfff | 2019-03-05 07:56:38 +0200 | [diff] [blame] | 83 | pcicfg(dev)->reg16[reg / sizeof(uint16_t)] = value; |
Stefan Reinauer | 00636b0 | 2012-04-04 00:08:51 +0200 | [diff] [blame] | 84 | } |
| 85 | |
Aaron Durbin | 75a62e7 | 2018-09-13 02:10:45 -0600 | [diff] [blame] | 86 | static __always_inline |
Nico Huber | f4f365f | 2021-10-14 18:16:39 +0200 | [diff] [blame] | 87 | void pci_s_write_config32(pci_devfn_t dev, uint16_t reg, uint32_t value) |
Stefan Reinauer | 00636b0 | 2012-04-04 00:08:51 +0200 | [diff] [blame] | 88 | { |
Kyösti Mälkki | d2cdfff | 2019-03-05 07:56:38 +0200 | [diff] [blame] | 89 | pcicfg(dev)->reg32[reg / sizeof(uint32_t)] = value; |
Stefan Reinauer | 00636b0 | 2012-04-04 00:08:51 +0200 | [diff] [blame] | 90 | } |
| 91 | |
Michael Niewöhner | efe3cfb | 2019-11-15 22:47:33 +0100 | [diff] [blame] | 92 | /* |
| 93 | * The functions pci_mmio_config*_addr provide a way to determine the MMIO address of a PCI |
| 94 | * config register. The address returned is dependent of both the MMCONF base address and the |
| 95 | * assigned PCI bus number of the requested device, which both can change during the boot |
| 96 | * process. Thus, the pointer returned here must not be cached! |
| 97 | */ |
Michael Niewöhner | 8f22136 | 2019-11-08 22:02:02 +0100 | [diff] [blame] | 98 | static __always_inline |
| 99 | uint8_t *pci_mmio_config8_addr(pci_devfn_t dev, uint16_t reg) |
| 100 | { |
| 101 | return (uint8_t *)&pcicfg(dev)->reg8[reg]; |
| 102 | } |
| 103 | |
| 104 | static __always_inline |
| 105 | uint16_t *pci_mmio_config16_addr(pci_devfn_t dev, uint16_t reg) |
| 106 | { |
| 107 | return (uint16_t *)&pcicfg(dev)->reg16[reg / sizeof(uint16_t)]; |
| 108 | } |
| 109 | |
| 110 | static __always_inline |
| 111 | uint32_t *pci_mmio_config32_addr(pci_devfn_t dev, uint16_t reg) |
| 112 | { |
| 113 | return (uint32_t *)&pcicfg(dev)->reg32[reg / sizeof(uint32_t)]; |
| 114 | } |
| 115 | |
Kyösti Mälkki | 54d6abd | 2013-06-19 23:05:00 +0300 | [diff] [blame] | 116 | #endif /* _PCI_MMIO_CFG_H */ |