From bf7435087eee94a6cbd5f50d816fea9168395090 Mon Sep 17 00:00:00 2001 From: Patrick Rudolph Date: Mon, 25 Mar 2019 17:05:20 +0100 Subject: sb/intel/sandybridge/early_pch: Make DMI init more readable MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a few comments and use known register values. Based on the "2nd Generation Intel® Core™ Processor Family Mobile" datasheet and the existing serialice trace. Tested on Lenovo T520 (Intel Sandy Bridge). Still boots to GNU/Linux. Change-Id: I404515b77a22324f55581f117d79630be4ba64dd Signed-off-by: Patrick Rudolph Reviewed-on: https://review.coreboot.org/c/coreboot/+/32071 Reviewed-by: Patrick Georgi Reviewed-by: HAOUAS Elyes Tested-by: build bot (Jenkins) --- src/southbridge/intel/bd82x6x/early_pch.c | 206 ++++++++++++++++++++---------- src/southbridge/intel/bd82x6x/pch.h | 2 + 2 files changed, 137 insertions(+), 71 deletions(-) (limited to 'src/southbridge') diff --git a/src/southbridge/intel/bd82x6x/early_pch.c b/src/southbridge/intel/bd82x6x/early_pch.c index a50a159668..76ca202776 100644 --- a/src/southbridge/intel/bd82x6x/early_pch.c +++ b/src/southbridge/intel/bd82x6x/early_pch.c @@ -20,6 +20,7 @@ #include #include #include +#include /* For DMI bar. */ #include @@ -68,36 +69,29 @@ write_iobp(u32 address, u32 val) read8(DEFAULT_RCBA + IOBPS); // call wait_iobp() instead here? } - static void init_dmi (void) { + volatile u32 tmp; int i; - write32 (DEFAULT_DMIBAR + 0x0914, - read32 (DEFAULT_DMIBAR + 0x0914) | 0x80000000); - write32 (DEFAULT_DMIBAR + 0x0934, - read32 (DEFAULT_DMIBAR + 0x0934) | 0x80000000); - for (i = 0; i < 4; i++) - { - write32 (DEFAULT_DMIBAR + 0x0a00 + (i << 4), - read32 (DEFAULT_DMIBAR + 0x0a00 + (i << 4)) & 0xf3ffffff); - write32 (DEFAULT_DMIBAR + 0x0a04 + (i << 4), - read32 (DEFAULT_DMIBAR + 0x0a04 + (i << 4)) | 0x800); + DMIBAR32(0x0914) |= 0x80000000; + DMIBAR32(0x0934) |= 0x80000000; + + for (i = 0; i < 4; i++) { + DMIBAR32(0x0a00 + (i << 4)) &= 0xf3ffffff; + DMIBAR32(0x0a04 + (i << 4)) |= 0x800; } - write32 (DEFAULT_DMIBAR + 0x0c30, (read32 (DEFAULT_DMIBAR + 0x0c30) - & 0xfffffff) | 0x40000000); - for (i = 0; i < 2; i++) - { - write32 (DEFAULT_DMIBAR + 0x0904 + (i << 5), - read32 (DEFAULT_DMIBAR + 0x0904 + (i << 5)) & 0xfe3fffff); - write32 (DEFAULT_DMIBAR + 0x090c + (i << 5), - read32 (DEFAULT_DMIBAR + 0x090c + (i << 5)) & 0xfff1ffff); + DMIBAR32(0x0c30) = (DMIBAR32(0x0c30) & 0xfffffff) | 0x40000000; + + for (i = 0; i < 2; i++) { + DMIBAR32(0x0904 + (i << 5)) &= 0xfe3fffff; + DMIBAR32(0x090c + (i << 5)) &= 0xfff1ffff; } - write32 (DEFAULT_DMIBAR + 0x090c, - read32 (DEFAULT_DMIBAR + 0x090c) & 0xfe1fffff); - write32 (DEFAULT_DMIBAR + 0x092c, - read32 (DEFAULT_DMIBAR + 0x092c) & 0xfe1fffff); + + DMIBAR32(0x090c) &= 0xfe1fffff; + DMIBAR32(0x092c) &= 0xfe1fffff; + read32 (DEFAULT_DMIBAR + 0x0904); // !!! = 0x7a1842ec write32 (DEFAULT_DMIBAR + 0x0904, 0x7a1842ec); read32 (DEFAULT_DMIBAR + 0x090c); // !!! = 0x00000208 @@ -226,33 +220,54 @@ init_dmi (void) write32 (DEFAULT_DMIBAR + 0x0934, 0x98200280); read32 (DEFAULT_DMIBAR + 0x022c); // !!! = 0x00c26460 write32 (DEFAULT_DMIBAR + 0x022c, 0x00c2403c); - read8 (DEFAULT_RCBA + 0x21a4); // !!! = 0x42 - - read32 (DEFAULT_RCBA + 0x21a4); // !!! = 0x00012c42 - read32 (DEFAULT_RCBA + 0x2340); // !!! = 0x0013001b - write32 (DEFAULT_RCBA + 0x2340, 0x003a001b); - read8 (DEFAULT_RCBA + 0x21b0); // !!! = 0x01 - write8 (DEFAULT_RCBA + 0x21b0, 0x02); - read32 (DEFAULT_DMIBAR + 0x0084); // !!! = 0x0041ac41 - write32 (DEFAULT_DMIBAR + 0x0084, 0x0041ac42); - read8 (DEFAULT_DMIBAR + 0x0088); // !!! = 0x00 - write8 (DEFAULT_DMIBAR + 0x0088, 0x20); - read16 (DEFAULT_DMIBAR + 0x008a); // !!! = 0x0041 - read8 (DEFAULT_DMIBAR + 0x0088); // !!! = 0x00 - write8 (DEFAULT_DMIBAR + 0x0088, 0x20); - read16 (DEFAULT_DMIBAR + 0x008a); // !!! = 0x0042 - read16 (DEFAULT_DMIBAR + 0x008a); // !!! = 0x0042 - - read32 (DEFAULT_DMIBAR + 0x0014); // !!! = 0x8000007f - write32 (DEFAULT_DMIBAR + 0x0014, 0x80000019); - read32 (DEFAULT_DMIBAR + 0x0020); // !!! = 0x01000000 - write32 (DEFAULT_DMIBAR + 0x0020, 0x81000022); - read32 (DEFAULT_DMIBAR + 0x002c); // !!! = 0x02000000 - write32 (DEFAULT_DMIBAR + 0x002c, 0x82000044); - read32 (DEFAULT_DMIBAR + 0x0038); // !!! = 0x07000080 - write32 (DEFAULT_DMIBAR + 0x0038, 0x87000080); - read8 (DEFAULT_DMIBAR + 0x0004); // !!! = 0x00 - write8 (DEFAULT_DMIBAR + 0x0004, 0x01); + + /* Link Capabilities Register */ + RCBA32(0x21a4) = (RCBA32(0x21a4) & ~0x3fc00) | + (3 << 10) | // L0s and L1 entry supported + (2 << 12) | // L0s 128 ns to less than 256 ns + (2 << 15); // L1 2 us to less than 4 us + + RCBA32(0x2340) = (RCBA32(0x2340) & ~0xff0000) | (0x3a << 16); + RCBA8(0x21b0) = (RCBA8(0x21b0) & ~0xf) | 2; + + /* Write once settings. */ + DMIBAR32(DMILCAP) = (DMIBAR32(DMILCAP) & ~0x3f00f) | + (2 << 0) | // 5GT/s + (2 << 12) | // L0s 128 ns to less than 256 ns + (2 << 15); // L1 2 us to less than 4 us + + DMIBAR8(DMILCTL) |= 0x20; // Retrain link + while (DMIBAR16(DMILSTS) & TXTRN) + ; + + DMIBAR8(DMILCTL) |= 0x20; // Retrain link + while (DMIBAR16(DMILSTS) & TXTRN) + ; + + const u8 w = (DMIBAR16(DMILSTS) >> 4) & 0x1f; + const u16 t = (DMIBAR16(DMILSTS) & 0xf) * 2500; + + printk(BIOS_DEBUG, "DMI: Running at X%x @ %dMT/s\n", w, t); + /* + * Virtual Channel resources must match settings in RCBA! + * + * Channel Vp and Vm are documented in + * "Desktop 4th Generation Intel Core Processor Family, Desktop Intel + * Pentium Processor Family, and Desktop Intel Celeron Processor Family + * Vol. 2" + */ + + /* Channel 0: Enable, Set ID to 0, map TC0 and TC3 and TC4 to VC0. */ + DMIBAR32(DMIVC0RCTL) = (1 << 31) | (0 << 24) | (0x0c << 1) | 1; + /* Channel 1: Enable, Set ID to 1, map TC1 and TC5 to VC1. */ + DMIBAR32(DMIVC1RCTL) = (1 << 31) | (1 << 24) | (0x11 << 1); + /* Channel p: Enable, Set ID to 2, map TC2 and TC6 to VCp */ + DMIBAR32(DMIVCPRCTL) = (1 << 31) | (2 << 24) | (0x22 << 1); + /* Channel m: Enable, Set ID to 0, map TC7 to VCm */ + DMIBAR32(DMIVCMRCTL) = (1 << 31) | (7 << 24) | (0x40 << 1); + + /* Set Extended VC Count (EVCC) to 1 as Channel 1 is active. */ + DMIBAR8(DMIPVCCAP1) |= 1; read32 (DEFAULT_RCBA + 0x0050); // !!! = 0x01200654 write32 (DEFAULT_RCBA + 0x0050, 0x01200654); @@ -261,27 +276,76 @@ init_dmi (void) read32 (DEFAULT_RCBA + 0x0050); // !!! = 0x012a0654 read8 (DEFAULT_RCBA + 0x1114); // !!! = 0x00 write8 (DEFAULT_RCBA + 0x1114, 0x05); - read32 (DEFAULT_RCBA + 0x2014); // !!! = 0x80000011 - write32 (DEFAULT_RCBA + 0x2014, 0x80000019); - read32 (DEFAULT_RCBA + 0x2020); // !!! = 0x00000000 - write32 (DEFAULT_RCBA + 0x2020, 0x81000022); - read32 (DEFAULT_RCBA + 0x2020); // !!! = 0x81000022 - read32 (DEFAULT_RCBA + 0x2030); // !!! = 0x00000000 - write32 (DEFAULT_RCBA + 0x2030, 0x82000044); - read32 (DEFAULT_RCBA + 0x2030); // !!! = 0x82000044 - read32 (DEFAULT_RCBA + 0x2040); // !!! = 0x00000000 - write32 (DEFAULT_RCBA + 0x2040, 0x87000080); - read32 (DEFAULT_RCBA + 0x0050); // !!! = 0x012a0654 - write32 (DEFAULT_RCBA + 0x0050, 0x812a0654); - read32 (DEFAULT_RCBA + 0x0050); // !!! = 0x812a0654 - read16 (DEFAULT_RCBA + 0x201a); // !!! = 0x0000 - read16 (DEFAULT_RCBA + 0x2026); // !!! = 0x0000 - read16 (DEFAULT_RCBA + 0x2036); // !!! = 0x0000 - read16 (DEFAULT_RCBA + 0x2046); // !!! = 0x0000 - read16 (DEFAULT_DMIBAR + 0x001a); // !!! = 0x0000 - read16 (DEFAULT_DMIBAR + 0x0026); // !!! = 0x0000 - read16 (DEFAULT_DMIBAR + 0x0032); // !!! = 0x0000 - read16 (DEFAULT_DMIBAR + 0x003e); // !!! = 0x0000 + + /* + * Virtual Channel resources must match settings in DMIBAR! + * + * Some of the following settings are taken from + * "Intel Core i5-600, i3-500 Desktop Processor Series and Intel + * Pentium Desktop Processor 6000 Series Vol. 2" datasheet and + * serialice traces. + */ + + /* Virtual Channel 0 Resource Control Register. + * Enable channel. + * Set Virtual Channel Identifier. + * Map TC0 and TC3 and TC4 to VC0. + */ + + RCBA32(0x2014) = (1 << 31) | (0 << 24) | (0x0c << 1) | 1; + + /* Virtual Channel 1 Resource Control Register. + * Enable channel. + * Set Virtual Channel Identifier. + * Map TC1 and TC5 to VC1. + */ + RCBA32(0x2020) = (1 << 31) | (1 << 24) | (0x11 << 1); + /* Read back register */ + tmp = RCBA32(0x2020); + + /* Virtual Channel private Resource Control Register. + * Enable channel. + * Set Virtual Channel Identifier. + * Map TC2 and TC6 to VCp. + */ + RCBA32(0x2030) = (1 << 31) | (2 << 24) | (0x22 << 1); + /* Read back register */ + tmp = RCBA32(0x2030); + + /* Virtual Channel ME Resource Control Register. + * Enable channel. + * Set Virtual Channel Identifier. + * Map TC7 to VCm. + */ + RCBA32(0x2040) = (1 << 31) | (7 << 24) | (0x40 << 1); + + /* Lock Virtual Channel Resource control register. */ + RCBA32(0x0050) |= 0x80000000; + /* Read back register */ + tmp = RCBA32(0x0050); + + /* Wait for virtual channels negotiation pending */ + while (RCBA16(0x201a) & VCNEGPND) + ; + while (RCBA16(0x2026) & VCNEGPND) + ; + while (RCBA16(0x2036) & VCNEGPND) + ; + while (RCBA16(0x2046) & VCNEGPND) + ; + + /* + * BIOS Requirement: Check if DMI VC Negotiation was successful. + * Wait for virtual channels negotiation pending. + */ + while (DMIBAR16(DMIVC0RSTS) & VC0NP) + ; + while (DMIBAR16(DMIVC1RSTS) & VC1NP) + ; + while (DMIBAR16(DMIVCPRSTS) & VCPNP) + ; + while (DMIBAR16(DMIVCMRSTS) & VCMNP) + ; } void diff --git a/src/southbridge/intel/bd82x6x/pch.h b/src/southbridge/intel/bd82x6x/pch.h index 21b603108a..fb8238ad4f 100644 --- a/src/southbridge/intel/bd82x6x/pch.h +++ b/src/southbridge/intel/bd82x6x/pch.h @@ -310,6 +310,8 @@ early_usb_init (const struct southbridge_usb_port *portmap); #define IOTR2 0x1e90 /* 64bit */ #define IOTR3 0x1e98 /* 64bit */ +#define VCNEGPND 2 + #define TCTL 0x3000 /* 8bit */ #define NOINT 0 -- cgit v1.2.3