tg3: Enable PLL PD when CLKREQ disabled for 5717A0

PCIe PLL power down cannot be used if CLKREQ is enabled because data
corruption will occur.  If CLKREQ is disabled though, enabling PCIE P1
PLL power-down saves some power.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index b0630cd093a3fa898f99c42bfdb67382cdefc068..b80e7eef8af97aaab36b25bac8a7836ddc70d312 100644 (file)
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -7569,6 +7569,20 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
                tw32(TG3_PCIE_LNKCTL, val | TG3_PCIE_LNKCTL_L1_PLL_PD_DIS);
        }
 
+       if (tp->tg3_flags3 & TG3_FLG3_L1PLLPD_EN) {
+               u32 grc_mode = tr32(GRC_MODE);
+
+               /* Access the lower 1K of PL PCIE block registers. */
+               val = grc_mode & ~GRC_MODE_PCIE_PORT_MASK;
+               tw32(GRC_MODE, val | GRC_MODE_PCIE_PL_SEL);
+
+               val = tr32(TG3_PCIE_TLDLPL_PORT + TG3_PCIE_PL_LO_PHYCTL1);
+               tw32(TG3_PCIE_TLDLPL_PORT + TG3_PCIE_PL_LO_PHYCTL1,
+                    val | TG3_PCIE_PL_LO_PHYCTL1_L1PLLPD_EN);
+
+               tw32(GRC_MODE, grc_mode);
+       }
+
        /* This works around an issue with Athlon chipsets on
         * B3 tigon3 silicon.  This bit has no effect on any
         * other revision.  But do not set this on PCI Express
@@ -13096,6 +13110,8 @@ static int __devinit tg3_get_invariants(struct tg3 *tp)
                            tp->pci_chip_rev_id == CHIPREV_ID_57780_A0 ||
                            tp->pci_chip_rev_id == CHIPREV_ID_57780_A1)
                                tp->tg3_flags3 |= TG3_FLG3_CLKREQ_BUG;
+               } else if (tp->pci_chip_rev_id == CHIPREV_ID_5717_A0) {
+                       tp->tg3_flags3 |= TG3_FLG3_L1PLLPD_EN;
                }
        } else if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5785) {
                tp->tg3_flags2 |= TG3_FLG2_PCI_EXPRESS;

diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index cd30889650f8774c2cab1273584888ee0b0e6ae4..44a505d07e20a90d294457ff7f4ade09ef8bfc55 100644 (file)
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -1540,6 +1540,8 @@
 #define  GRC_MODE_HOST_SENDBDS         0x00020000
 #define  GRC_MODE_NO_TX_PHDR_CSUM      0x00100000
 #define  GRC_MODE_NVRAM_WR_ENABLE      0x00200000
+#define  GRC_MODE_PCIE_TL_SEL          0x00000000
+#define  GRC_MODE_PCIE_PL_SEL          0x00400000
 #define  GRC_MODE_NO_RX_PHDR_CSUM      0x00800000
 #define  GRC_MODE_IRQ_ON_TX_CPU_ATTN   0x01000000
 #define  GRC_MODE_IRQ_ON_RX_CPU_ATTN   0x02000000
@@ -1547,7 +1549,13 @@
 #define  GRC_MODE_IRQ_ON_DMA_ATTN      0x08000000
 #define  GRC_MODE_IRQ_ON_FLOW_ATTN     0x10000000
 #define  GRC_MODE_4X_NIC_SEND_RINGS    0x20000000
+#define  GRC_MODE_PCIE_DL_SEL          0x20000000
 #define  GRC_MODE_MCAST_FRM_ENABLE     0x40000000
+#define  GRC_MODE_PCIE_HI_1K_EN                0x80000000
+#define  GRC_MODE_PCIE_PORT_MASK       (GRC_MODE_PCIE_TL_SEL | \
+                                        GRC_MODE_PCIE_PL_SEL | \
+                                        GRC_MODE_PCIE_DL_SEL | \
+                                        GRC_MODE_PCIE_HI_1K_EN)
 #define GRC_MISC_CFG                   0x00006804
 #define  GRC_MISC_CFG_CORECLK_RESET    0x00000001
 #define  GRC_MISC_CFG_PRESCALAR_MASK   0x000000fe
@@ -1801,6 +1809,11 @@
 /* 0x7e74 --> 0x8000 unused */
 
 
+/* Alternate PCIE definitions */
+#define TG3_PCIE_TLDLPL_PORT           0x00007c00
+#define TG3_PCIE_PL_LO_PHYCTL1          0x00000004
+#define TG3_PCIE_PL_LO_PHYCTL1_L1PLLPD_EN        0x00001000
+
 /* OTP bit definitions */
 #define TG3_OTP_AGCTGT_MASK            0x000000e0
 #define TG3_OTP_AGCTGT_SHIFT           1
@@ -2809,6 +2822,7 @@ struct tg3 {
 #define TG3_FLG3_40BIT_DMA_LIMIT_BUG   0x00100000
 #define TG3_FLG3_SHORT_DMA_BUG         0x00200000
 #define TG3_FLG3_USE_JUMBO_BDFLAG      0x00400000
+#define TG3_FLG3_L1PLLPD_EN            0x00800000
 
        struct timer_list               timer;
        u16                             timer_counter;