[U-Boot] [PATCH 34/39] x86: ivybridge: Add early init for PCH devices
Bin Meng
bmeng.cn at gmail.com
Wed Nov 12 02:33:43 CET 2014
Hi Simon,
On Wed, Nov 12, 2014 at 12:15 AM, Simon Glass <sjg at chromium.org> wrote:
> Hi Bin,
>
> On 11 November 2014 07:52, Bin Meng <bmeng.cn at gmail.com> wrote:
>> Hi Simon,
>>
>> On Fri, Nov 7, 2014 at 4:20 AM, Simon Glass <sjg at chromium.org> wrote:
>>> Many PCH devices are hard-coded to a particular PCI address. Set these
>>> up early in case they are needed.
>>>
>>> Signed-off-by: Simon Glass <sjg at chromium.org>
>>> ---
>>>
>>> arch/x86/cpu/ivybridge/Makefile | 1 +
>>> arch/x86/cpu/ivybridge/cpu.c | 142 +++++++++++++++++++++
>>> arch/x86/cpu/ivybridge/early_init.c | 145 ++++++++++++++++++++++
>>> arch/x86/include/asm/arch-ivybridge/pch.h | 121 +++++++++++++++++-
>>> arch/x86/include/asm/arch-ivybridge/sandybridge.h | 107 ++++++++++++++++
>>> arch/x86/include/asm/global_data.h | 8 ++
>>> arch/x86/include/asm/post.h | 2 +
>>> 7 files changed, 525 insertions(+), 1 deletion(-)
>>> create mode 100644 arch/x86/cpu/ivybridge/early_init.c
>>> create mode 100644 arch/x86/include/asm/arch-ivybridge/sandybridge.h
>>>
>>> diff --git a/arch/x86/cpu/ivybridge/Makefile b/arch/x86/cpu/ivybridge/Makefile
>>> index a3ea566..4bfb03a 100644
>>> --- a/arch/x86/cpu/ivybridge/Makefile
>>> +++ b/arch/x86/cpu/ivybridge/Makefile
>>> @@ -6,6 +6,7 @@
>>>
>>> obj-y += car.o
>>> obj-y += cpu.o
>>> +obj-y += early_init.o
>>> obj-y += lpc.o
>>> obj-y += microcode_intel.o
>>> obj-y += sdram.o
>>> diff --git a/arch/x86/cpu/ivybridge/cpu.c b/arch/x86/cpu/ivybridge/cpu.c
>>> index bd2660f..a435520 100644
>>> --- a/arch/x86/cpu/ivybridge/cpu.c
>>> +++ b/arch/x86/cpu/ivybridge/cpu.c
>>> @@ -4,6 +4,7 @@
>>> * Graeme Russ, graeme.russ at gmail.com.
>>> *
>>> * Some portions from coreboot src/mainboard/google/link/romstage.c
>>> + * and src/cpu/intel/model_206ax/bootblock.c
>>> * Copyright (C) 2007-2010 coresystems GmbH
>>> * Copyright (C) 2011 Google Inc.
>>> *
>>> @@ -16,11 +17,13 @@
>>> #include <asm/io.h>
>>> #include <asm/msr.h>
>>> #include <asm/mtrr.h>
>>> +#include <asm/pci.h>
>>> #include <asm/post.h>
>>> #include <asm/processor.h>
>>> #include <asm/arch/model_206ax.h>
>>> #include <asm/arch/microcode.h>
>>> #include <asm/arch/pch.h>
>>> +#include <asm/arch/sandybridge.h>
>>>
>>> DECLARE_GLOBAL_DATA_PTR;
>>>
>>> @@ -178,6 +181,83 @@ int arch_cpu_init(void)
>>> return 0;
>>> }
>>>
>>> +static int enable_smbus(void)
>>> +{
>>> + pci_dev_t dev;
>>> + uint16_t value;
>>> +
>>> + /* Set the SMBus device statically. */
>>> + dev = PCI_BDF(0x0, 0x1f, 0x3);
>>> +
>>> + /* Check to make sure we've got the right device. */
>>> + value = pci_read_config16(dev, 0x0);
>>> + if (value != 0x8086) {
>>> + printf("SMBus controller not found\n");
>>> + return -ENOSYS;
>>> + }
>>> +
>>> + /* Set SMBus I/O base. */
>>> + pci_write_config32(dev, SMB_BASE,
>>> + SMBUS_IO_BASE | PCI_BASE_ADDRESS_SPACE_IO);
>>> +
>>> + /* Set SMBus enable. */
>>> + pci_write_config8(dev, HOSTC, HST_EN);
>>> +
>>> + /* Set SMBus I/O space enable. */
>>> + pci_write_config16(dev, PCI_COMMAND, PCI_COMMAND_IO);
>>> +
>>> + /* Disable interrupt generation. */
>>> + outb(0, SMBUS_IO_BASE + SMBHSTCTL);
>>> +
>>> + /* Clear any lingering errors, so transactions can run. */
>>> + outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
>>> + debug("SMBus controller enabled\n");
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +#define PCH_EHCI0_TEMP_BAR0 0xe8000000
>>> +#define PCH_EHCI1_TEMP_BAR0 0xe8000400
>>> +#define PCH_XHCI_TEMP_BAR0 0xe8001000
>>> +
>>> +/*
>>> + * Setup USB controller MMIO BAR to prevent the reference code from
>>> + * resetting the controller.
>>> + *
>>> + * The BAR will be re-assigned during device enumeration so these are only
>>> + * temporary.
>>> + *
>>> + * This is used to speed up the resume path.
>>> + */
>>> +static void enable_usb_bar(void)
>>> +{
>>> + pci_dev_t usb0 = PCH_EHCI1_DEV;
>>> + pci_dev_t usb1 = PCH_EHCI2_DEV;
>>> + pci_dev_t usb3 = PCH_XHCI_DEV;
>>> + u32 cmd;
>>> +
>>> + /* USB Controller 1 */
>>> + pci_write_config32(usb0, PCI_BASE_ADDRESS_0,
>>> + PCH_EHCI0_TEMP_BAR0);
>>> + cmd = pci_read_config32(usb0, PCI_COMMAND);
>>> + cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
>>> + pci_write_config32(usb0, PCI_COMMAND, cmd);
>>> +
>>> + /* USB Controller 1 */
>>> + pci_write_config32(usb1, PCI_BASE_ADDRESS_0,
>>> + PCH_EHCI1_TEMP_BAR0);
>>> + cmd = pci_read_config32(usb1, PCI_COMMAND);
>>> + cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
>>> + pci_write_config32(usb1, PCI_COMMAND, cmd);
>>> +
>>> + /* USB3 Controller */
>>> + pci_write_config32(usb3, PCI_BASE_ADDRESS_0,
>>> + PCH_XHCI_TEMP_BAR0);
>>> + cmd = pci_read_config32(usb3, PCI_COMMAND);
>>> + cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
>>> + pci_write_config32(usb3, PCI_COMMAND, cmd);
>>> +}
>>> +
>>> static int report_bist_failure(void)
>>> {
>>> if (gd->arch.bist != 0) {
>>> @@ -190,8 +270,11 @@ static int report_bist_failure(void)
>>>
>>> int print_cpuinfo(void)
>>> {
>>> + enum pei_boot_mode_t boot_mode = PEI_BOOT_NONE;
>>> char processor_name[CPU_MAX_NAME_LEN];
>>> const char *name;
>>> + uint32_t pm1_cnt;
>>> + uint16_t pm1_sts;
>>> int ret;
>>>
>>> /* Halt if there was a built in self test failure */
>>> @@ -203,9 +286,68 @@ int print_cpuinfo(void)
>>> if (ret && ret != -ENOENT && ret != -EEXIST)
>>> return ret;
>>>
>>> + /* Enable upper 128bytes of CMOS */
>>> + writel(1 << 2, RCB_REG(RC));
>>> +
>>> + /* TODO: cmos_post_init() */
>>> + if (readl(MCHBAR_REG(SSKPD)) == 0xCAFE) {
>>> + debug("soft reset detected\n");
>>> + boot_mode = PEI_BOOT_SOFT_RESET;
>>> +
>>> + /* System is not happy after keyboard reset... */
>>> + debug("Issuing CF9 warm reset\n");
>>> + outb(0x6, 0xcf9);
>>> + cpu_hlt();
>>> + }
>>> +
>>> + /* Early chipset init required before RAM init can work */
>>> + sandybridge_early_init(SANDYBRIDGE_MOBILE);
>>> +
>>> + /* Check PM1_STS[15] to see if we are waking from Sx */
>>> + pm1_sts = inw(DEFAULT_PMBASE + PM1_STS);
>>> +
>>> + /* Read PM1_CNT[12:10] to determine which Sx state */
>>> + pm1_cnt = inl(DEFAULT_PMBASE + PM1_CNT);
>>> +
>>> + if ((pm1_sts & WAK_STS) && ((pm1_cnt >> 10) & 7) == 5) {
>>> +#if CONFIG_HAVE_ACPI_RESUME
>>> + debug("Resume from S3 detected.\n");
>>> + boot_mode = PEI_BOOT_RESUME;
>>> + /* Clear SLP_TYPE. This will break stage2 but
>>> + * we care for that when we get there.
>>> + */
>>> + outl(pm1_cnt & ~(7 << 10), DEFAULT_PMBASE + PM1_CNT);
>>> +#else
>>> + debug("Resume from S3 detected, but disabled.\n");
>>> +#endif
>>> + } else {
>>> + /*
>>> + * TODO: An indication of life might be possible here (e.g.
>>> + * keyboard light)
>>> + */
>>> + }
>>> + post_code(POST_EARLY_INIT);
>>> +
>>> + /* Enable SPD ROMs and DDR-III DRAM */
>>> + ret = enable_smbus();
>>> + if (ret)
>>> + return ret;
>>> +
>>> + /* Prepare USB controller early in S3 resume */
>>> + if (boot_mode == PEI_BOOT_RESUME)
>>> + enable_usb_bar();
>>> +
>>> + gd->arch.pei_boot_mode = boot_mode;
>>> +
>>> + /* TODO: Move this to the board or driver */
>>> + pci_write_config32(PCH_LPC_DEV, GPIO_BASE, DEFAULT_GPIOBASE | 1);
>>> + pci_write_config32(PCH_LPC_DEV, GPIO_CNTL, 0x10);
>>> +
>>
>> Are these additional initialization needed right here? Can they be
>> moved to somewhere else, so that print_cpuinfo() is just doing its job
>> of printing cpu information?
>
> I believe it is all needed. I have already moved out quite a bit of
> stuff. We could add a new init function, but for now I wanted to avoid
> this, since the init list is generic.
After looking all the initialization routines in common/board_f.c, if
these cannot be done in arch_cpu_init(), could we move them to
board_early_init_f()?
> Re the last bit (GPIO) it seems to have to happen here, or at least a
> while before the GPIOs are actually used. Otherwise they fail.
>
> Regards,
> Simon
Regards,
Bin
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