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Message-ID: <20170619145140.vreh5zsfy56nggcr@linux.intel.com>
Date: Mon, 19 Jun 2017 16:51:40 +0200
From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To: Azhar Shaikh <azhar.shaikh@...el.com>
Cc: jgunthorpe@...idianresearch.com, tpmdd-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH v5] tpm: Enable CLKRUN protocol for Braswell systems
On Sun, Jun 18, 2017 at 07:17:59PM -0700, Azhar Shaikh wrote:
> To overcome a hardware limitation on Intel Braswell systems,
> disable CLKRUN protocol during TPM transactions and re-enable
> once the transaction is completed.
>
> Signed-off-by: Azhar Shaikh <azhar.shaikh@...el.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com> (compilation)
/Jarkko
> ---
> Changes from v1:
> - Add CONFIG_X86 around disable_lpc_clk_run() and enable_lpc_clk_run() to avoid
> - build breakage on architectures which do not implement kmap_atomic_pfn()
>
> Changes from v2:
> - Use ioremap()/iounmap() instead of kmap_atomic_pfn()/kunmap_atomic()
> - Move is_bsw() and all macros from tpm.h to tpm_tis.c file.
> - Add the is_bsw() check in disable_lpc_clk_run() and enable_lpc_clk_run()
> - instead of adding it in each read/write API.
>
> Changes from v3:
> - Move the code under #ifdef CONFIG_X86 and create stub functions for everything else
> - Rename the functions disable_lpc_clk_run() -> tpm_platform_begin_xfer() and
> - enable_lpc_clk_run() -> tpm_platform_end_xfer()
> - Remove wmb()
> - Correct the parameters for outb()
>
> Changes from v4:
> - Rebased to apply on git://git.infradead.org/users/jjs/linux-tpmdd.git
>
> drivers/char/tpm/tpm.h | 4 ++
> drivers/char/tpm/tpm_tis.c | 112 +++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 116 insertions(+)
>
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index 1df0521138d3..cdd261383dea 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -36,6 +36,10 @@
> #include <linux/highmem.h>
> #include <crypto/hash_info.h>
>
> +#ifdef CONFIG_X86
> +#include <asm/intel-family.h>
> +#endif
> +
> enum tpm_const {
> TPM_MINOR = 224, /* officially assigned */
> TPM_BUFSIZE = 4096,
> diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> index b14d4aa97af8..506e62ca3576 100644
> --- a/drivers/char/tpm/tpm_tis.c
> +++ b/drivers/char/tpm/tpm_tis.c
> @@ -132,13 +132,93 @@ static int check_acpi_tpm2(struct device *dev)
> }
> #endif
>
> +#ifdef CONFIG_X86
> +#define INTEL_LEGACY_BLK_BASE_ADDR 0xFED08000
> +#define ILB_REMAP_SIZE 0x100
> +#define LPC_CNTRL_REG_OFFSET 0x84
> +#define LPC_CLKRUN_EN (1 << 2)
> +
> +void __iomem *ilb_base_addr;
> +
> +static inline bool is_bsw(void)
> +{
> + return ((boot_cpu_data.x86_model == INTEL_FAM6_ATOM_AIRMONT) ? 1 : 0);
> +}
> +
> +/**
> + * tpm_platform_begin_xfer() - clear LPC CLKRUN_EN i.e. clocks will be running
> + */
> +static void tpm_platform_begin_xfer(void)
> +{
> + u32 clkrun_val;
> +
> + if (!is_bsw())
> + return;
> +
> + clkrun_val = ioread32(ilb_base_addr + LPC_CNTRL_REG_OFFSET);
> +
> + /* Disable LPC CLKRUN# */
> + clkrun_val &= ~LPC_CLKRUN_EN;
> + iowrite32(clkrun_val, ilb_base_addr + LPC_CNTRL_REG_OFFSET);
> +
> + /*
> + * Write any random value on port 0x80 which is on LPC, to make
> + * sure LPC clock is running before sending any TPM command.
> + */
> + outb(0xCC, 0x80);
> +
> +}
> +
> +/**
> + * tpm_platform_end_xfer() - set LPC CLKRUN_EN i.e. clocks can be turned off
> + */
> +static void tpm_platform_end_xfer(void)
> +{
> + u32 clkrun_val;
> +
> + if (!is_bsw())
> + return;
> +
> + clkrun_val = ioread32(ilb_base_addr + LPC_CNTRL_REG_OFFSET);
> +
> + /* Enable LPC CLKRUN# */
> + clkrun_val |= LPC_CLKRUN_EN;
> + iowrite32(clkrun_val, ilb_base_addr + LPC_CNTRL_REG_OFFSET);
> +
> + /*
> + * Write any random value on port 0x80 which is on LPC, to make
> + * sure LPC clock is running before sending any TPM command.
> + */
> + outb(0xCC, 0x80);
> +
> +}
> +#else
> +static inline bool is_bsw(void)
> +{
> + return false;
> +}
> +
> +static void tpm_platform_begin_xfer(void)
> +{
> +}
> +
> +static void tpm_platform_end_xfer(void)
> +{
> +}
> +#endif
> +
> static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
> u8 *result)
> {
> struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
>
> + tpm_platform_begin_xfer();
> +
> while (len--)
> *result++ = ioread8(phy->iobase + addr);
> +
> + tpm_platform_end_xfer();
> +
> return 0;
> }
>
> @@ -147,8 +227,13 @@ static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
> {
> struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
>
> + tpm_platform_begin_xfer();
> +
> while (len--)
> iowrite8(*value++, phy->iobase + addr);
> +
> + tpm_platform_end_xfer();
> +
> return 0;
> }
>
> @@ -156,7 +241,12 @@ static int tpm_tcg_read16(struct tpm_tis_data *data, u32 addr, u16 *result)
> {
> struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
>
> + tpm_platform_begin_xfer();
> +
> *result = ioread16(phy->iobase + addr);
> +
> + tpm_platform_end_xfer();
> +
> return 0;
> }
>
> @@ -164,7 +254,12 @@ static int tpm_tcg_read32(struct tpm_tis_data *data, u32 addr, u32 *result)
> {
> struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
>
> + tpm_platform_begin_xfer();
> +
> *result = ioread32(phy->iobase + addr);
> +
> + tpm_platform_end_xfer();
> +
> return 0;
> }
>
> @@ -172,7 +267,12 @@ static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value)
> {
> struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
>
> + tpm_platform_begin_xfer();
> +
> iowrite32(value, phy->iobase + addr);
> +
> + tpm_platform_end_xfer();
> +
> return 0;
> }
>
> @@ -230,6 +330,12 @@ static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
> else
> tpm_info.irq = -1;
>
> +#ifdef CONFIG_X86
> + if (is_bsw())
> + ilb_base_addr = ioremap(INTEL_LEGACY_BLK_BASE_ADDR,
> + ILB_REMAP_SIZE);
> +#endif
> +
> return tpm_tis_init(&pnp_dev->dev, &tpm_info);
> }
>
> @@ -253,6 +359,12 @@ static void tpm_tis_pnp_remove(struct pnp_dev *dev)
>
> tpm_chip_unregister(chip);
> tpm_tis_remove(chip);
> +
> +#ifdef CONFIG_X86
> + if (is_bsw())
> + iounmap(ilb_base_addr);
> +#endif
> +
> }
>
> static struct pnp_driver tis_pnp_driver = {
> --
> 1.9.1
>
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