From 603dd56618d21e9000ea392bccb43054f284f140 Mon Sep 17 00:00:00 2001 From: Subrata Banik Date: Tue, 28 Mar 2023 17:54:27 +0530 Subject: soc/intel/alderlake: Avoid reprogramming the SRAM BAR MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch avoids the redundant programming of SRAM BAR when the SRAM PCI device is enabled. Rather read the PCH SRAM Base Address Register while enabling crashlog feature. Additionally, this patch relies on PCI enumeration to get the SRAM BAR rather than hijacking the SPI temporary base address which might have resulted in problems if SPI is disabled on some platform with BAR being implemented. TEST=Able to build and boot google/marasov and crashlog is working. Change-Id: I8eb256aa63bbf7222f67cd16a160e71cfb89875a Signed-off-by: Subrata Banik Reviewed-on: https://review.coreboot.org/c/coreboot/+/74056 Tested-by: build bot (Jenkins) Reviewed-by: Tarun Tuli Reviewed-by: Pratikkumar V Prajapati Reviewed-by: Eric Lai Reviewed-by: Kapil Porwal --- src/soc/intel/alderlake/crashlog.c | 36 +++++++++++++++++++++++++++++++----- 1 file changed, 31 insertions(+), 5 deletions(-) diff --git a/src/soc/intel/alderlake/crashlog.c b/src/soc/intel/alderlake/crashlog.c index b47d5644f9..5a08c25a62 100644 --- a/src/soc/intel/alderlake/crashlog.c +++ b/src/soc/intel/alderlake/crashlog.c @@ -28,6 +28,31 @@ u32 __weak cl_get_cpu_mb_int_addr(void) return CRASHLOG_MAILBOX_INTF_ADDRESS; } +/* Get the SRAM BAR. */ +static uintptr_t sram_get_bar(void) +{ + uintptr_t sram_bar; + const struct device *dev; + struct resource *res; + + dev = pcidev_path_on_root(PCH_DEVFN_SRAM); + if (!dev) { + printk(BIOS_ERR, "PCH_DEVFN_SRAM device not found!\n"); + return 0; + } + + res = probe_resource(dev, PCI_BASE_ADDRESS_0); + if (!res) { + printk(BIOS_ERR, "PCH SRAM device not found!\n"); + return 0; + } + + /* Get the base address of the resource */ + sram_bar = res->base; + + return sram_bar; +} + bool pmc_cl_discovery(void) { u32 tmp_bar_addr = 0, desc_table_addr = 0; @@ -58,10 +83,11 @@ bool pmc_cl_discovery(void) } m_pmc_crashLog_support = true; - /* Program BAR 0 and enable command register memory space decoding */ - tmp_bar_addr = SPI_BASE_ADDRESS; - pci_write_config32(PCH_DEV_SRAM, PCI_BASE_ADDRESS_0, tmp_bar_addr); - pci_or_config16(PCH_DEV_SRAM, PCI_COMMAND, PCI_COMMAND_MEMORY); + tmp_bar_addr = sram_get_bar(); + if (tmp_bar_addr == 0) { + printk(BIOS_ERR, "PCH SRAM not available, crashlog feature can't be enabled.\n"); + return false; + } if (discovery_buf.bits.discov_mechanism == 1) { /* discovery mode */ @@ -113,7 +139,7 @@ u32 cl_get_cpu_bar_addr(void) u32 cl_get_cpu_tmp_bar(void) { - return SPI_BASE_ADDRESS; + return sram_get_bar(); } bool cl_pmc_sram_has_mmio_access(void) -- cgit v1.2.3