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PCI: exynos: Turn off power of phy block when link failed 

When link failed, there is no need to turn on phy block. Also,
turning on phy block is added, in order to turn on phy block
regardless of the default value of phy registers.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Jingoo Han 2013-09-06 17:21:45 +09:00 committed by Bjorn Helgaas
parent f342d940ee
commit f62b878b4d
1 changed files with 68 additions and 0 deletions
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68
drivers/pci/host/pci-exynos.c
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@ -78,18 +78,28 @@ struct exynos_pcie {
#define PCIE_PHY_PLL_BIAS 0x00c
#define PCIE_PHY_DCC_FEEDBACK 0x014
#define PCIE_PHY_PLL_DIV_1 0x05c
#define PCIE_PHY_COMMON_POWER 0x064
#define PCIE_PHY_COMMON_PD_CMN (0x1 << 3)
#define PCIE_PHY_TRSV0_EMP_LVL 0x084
#define PCIE_PHY_TRSV0_DRV_LVL 0x088
#define PCIE_PHY_TRSV0_RXCDR 0x0ac
#define PCIE_PHY_TRSV0_POWER 0x0c4
#define PCIE_PHY_TRSV0_PD_TSV (0x1 << 7)
#define PCIE_PHY_TRSV0_LVCC 0x0dc
#define PCIE_PHY_TRSV1_EMP_LVL 0x144
#define PCIE_PHY_TRSV1_RXCDR 0x16c
#define PCIE_PHY_TRSV1_POWER 0x184
#define PCIE_PHY_TRSV1_PD_TSV (0x1 << 7)
#define PCIE_PHY_TRSV1_LVCC 0x19c
#define PCIE_PHY_TRSV2_EMP_LVL 0x204
#define PCIE_PHY_TRSV2_RXCDR 0x22c
#define PCIE_PHY_TRSV2_POWER 0x244
#define PCIE_PHY_TRSV2_PD_TSV (0x1 << 7)
#define PCIE_PHY_TRSV2_LVCC 0x25c
#define PCIE_PHY_TRSV3_EMP_LVL 0x2c4
#define PCIE_PHY_TRSV3_RXCDR 0x2ec
#define PCIE_PHY_TRSV3_POWER 0x304
#define PCIE_PHY_TRSV3_PD_TSV (0x1 << 7)
#define PCIE_PHY_TRSV3_LVCC 0x31c
static inline void exynos_elb_writel(struct exynos_pcie *pcie, u32 val, u32 reg)
@ -203,6 +213,58 @@ static void exynos_pcie_deassert_phy_reset(struct pcie_port *pp)
exynos_blk_writel(exynos_pcie, 0, PCIE_PHY_TRSV_RESET);
}
static void exynos_pcie_power_on_phy(struct pcie_port *pp)
{
u32 val;
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
val = exynos_phy_readl(exynos_pcie, PCIE_PHY_COMMON_POWER);
val &= ~PCIE_PHY_COMMON_PD_CMN;
exynos_phy_writel(exynos_pcie, val, PCIE_PHY_COMMON_POWER);
val = exynos_phy_readl(exynos_pcie, PCIE_PHY_TRSV0_POWER);
val &= ~PCIE_PHY_TRSV0_PD_TSV;
exynos_phy_writel(exynos_pcie, val, PCIE_PHY_TRSV0_POWER);
val = exynos_phy_readl(exynos_pcie, PCIE_PHY_TRSV1_POWER);
val &= ~PCIE_PHY_TRSV1_PD_TSV;
exynos_phy_writel(exynos_pcie, val, PCIE_PHY_TRSV1_POWER);
val = exynos_phy_readl(exynos_pcie, PCIE_PHY_TRSV2_POWER);
val &= ~PCIE_PHY_TRSV2_PD_TSV;
exynos_phy_writel(exynos_pcie, val, PCIE_PHY_TRSV2_POWER);
val = exynos_phy_readl(exynos_pcie, PCIE_PHY_TRSV3_POWER);
val &= ~PCIE_PHY_TRSV3_PD_TSV;
exynos_phy_writel(exynos_pcie, val, PCIE_PHY_TRSV3_POWER);
}
static void exynos_pcie_power_off_phy(struct pcie_port *pp)
{
u32 val;
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
val = exynos_phy_readl(exynos_pcie, PCIE_PHY_COMMON_POWER);
val |= PCIE_PHY_COMMON_PD_CMN;
exynos_phy_writel(exynos_pcie, val, PCIE_PHY_COMMON_POWER);
val = exynos_phy_readl(exynos_pcie, PCIE_PHY_TRSV0_POWER);
val |= PCIE_PHY_TRSV0_PD_TSV;
exynos_phy_writel(exynos_pcie, val, PCIE_PHY_TRSV0_POWER);
val = exynos_phy_readl(exynos_pcie, PCIE_PHY_TRSV1_POWER);
val |= PCIE_PHY_TRSV1_PD_TSV;
exynos_phy_writel(exynos_pcie, val, PCIE_PHY_TRSV1_POWER);
val = exynos_phy_readl(exynos_pcie, PCIE_PHY_TRSV2_POWER);
val |= PCIE_PHY_TRSV2_PD_TSV;
exynos_phy_writel(exynos_pcie, val, PCIE_PHY_TRSV2_POWER);
val = exynos_phy_readl(exynos_pcie, PCIE_PHY_TRSV3_POWER);
val |= PCIE_PHY_TRSV3_PD_TSV;
exynos_phy_writel(exynos_pcie, val, PCIE_PHY_TRSV3_POWER);
}
static void exynos_pcie_init_phy(struct pcie_port *pp)
{
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
@ -271,6 +333,9 @@ static int exynos_pcie_establish_link(struct pcie_port *pp)
/* de-assert phy reset */
exynos_pcie_deassert_phy_reset(pp);
/* power on phy */
exynos_pcie_power_on_phy(pp);
/* initialize phy */
exynos_pcie_init_phy(pp);
@ -303,6 +368,9 @@ static int exynos_pcie_establish_link(struct pcie_port *pp)
PCIE_PHY_PLL_LOCKED);
dev_info(pp->dev, "PLL Locked: 0x%x\n", val);
}
/* power off phy */
exynos_pcie_power_off_phy(pp);
dev_err(pp->dev, "PCIe Link Fail\n");
return -EINVAL;
}