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NTB: add helper functions to set and clear sideinfo

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We define two new helper functions to set and clear
sideinfo registers respectively. These functions
take an additional boolean parameter which signifies
whether we want to set/clear the sideinfo register
of the peer(true) or local host(false).

Signed-off-by: Arindam Nath <arindam.nath@amd.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Arindam Nath 2020-02-05 21:24:28 +05:30 committed by Jon Mason
parent 92abf4cb99
commit ae5f4bdccf
2 changed files with 37 additions and 10 deletions
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44
drivers/ntb/hw/amd/ntb_hw_amd.c
View File

@ -913,17 +913,47 @@ static int amd_init_isr(struct amd_ntb_dev *ndev)
return ndev_init_isr(ndev, AMD_DB_CNT, AMD_MSIX_VECTOR_CNT);
}
static void amd_init_side_info(struct amd_ntb_dev *ndev)
static void amd_set_side_info_reg(struct amd_ntb_dev *ndev, bool peer)
{
void __iomem *mmio = ndev->self_mmio;
void __iomem *mmio = NULL;
unsigned int reg;
u32 ntb_ctl;
if (peer)
mmio = ndev->peer_mmio;
else
mmio = ndev->self_mmio;
reg = readl(mmio + AMD_SIDEINFO_OFFSET);
if (!(reg & AMD_SIDE_READY)) {
reg |= AMD_SIDE_READY;
writel(reg, mmio + AMD_SIDEINFO_OFFSET);
}
}
static void amd_clear_side_info_reg(struct amd_ntb_dev *ndev, bool peer)
{
void __iomem *mmio = NULL;
unsigned int reg;
if (peer)
mmio = ndev->peer_mmio;
else
mmio = ndev->self_mmio;
reg = readl(mmio + AMD_SIDEINFO_OFFSET);
if (reg & AMD_SIDE_READY) {
reg &= ~AMD_SIDE_READY;
writel(reg, mmio + AMD_SIDEINFO_OFFSET);
readl(mmio + AMD_SIDEINFO_OFFSET);
}
}
static void amd_init_side_info(struct amd_ntb_dev *ndev)
{
void __iomem *mmio = ndev->self_mmio;
u32 ntb_ctl;
amd_set_side_info_reg(ndev, false);
ntb_ctl = readl(mmio + AMD_CNTL_OFFSET);
ntb_ctl |= (PMM_REG_CTL | SMM_REG_CTL);
@ -933,15 +963,9 @@ static void amd_init_side_info(struct amd_ntb_dev *ndev)
static void amd_deinit_side_info(struct amd_ntb_dev *ndev)
{
void __iomem *mmio = ndev->self_mmio;
unsigned int reg;
u32 ntb_ctl;
reg = readl(mmio + AMD_SIDEINFO_OFFSET);
if (reg & AMD_SIDE_READY) {
reg &= ~AMD_SIDE_READY;
writel(reg, mmio + AMD_SIDEINFO_OFFSET);
readl(mmio + AMD_SIDEINFO_OFFSET);
}
amd_clear_side_info_reg(ndev, false);
ntb_ctl = readl(mmio + AMD_CNTL_OFFSET);
ntb_ctl &= ~(PMM_REG_CTL | SMM_REG_CTL);

3
drivers/ntb/hw/amd/ntb_hw_amd.h
View File

@ -215,4 +215,7 @@ struct amd_ntb_dev {
#define ntb_ndev(__ntb) container_of(__ntb, struct amd_ntb_dev, ntb)
#define hb_ndev(__work) container_of(__work, struct amd_ntb_dev, hb_timer.work)
static void amd_set_side_info_reg(struct amd_ntb_dev *ndev, bool peer);
static void amd_clear_side_info_reg(struct amd_ntb_dev *ndev, bool peer);
#endif