Per PCIe r3.0, sec 5.3.3.2.1, PCIe root port shoould broadcast PME_Turn_Off
message before PCIe link goes to L2. PME_Turn_Off broadcast mechanism is
implemented in AFI module. Each Tegra PCIe root port has its own
PME_Turn_Off and PME_TO_Ack bitmap in AFI_PME register, program this
register to broadcast PME_Turn_Off message.
Signed-off-by: Manikanta Maddireddy <mmaddireddy@xxxxxxxxxx>
---
V2:
* no change in this patch
V3:
* add PME bitmap in soc data instead of using compatible string
* replace while loop with readl_poll_timeout() for polling
* commit log correction
V4:
* no change in this patch
drivers/pci/host/pci-tegra.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index 06d62122b269..1972081322c4 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -31,6 +31,7 @@
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/interrupt.h>
+#include <linux/iopoll.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
@@ -154,6 +155,8 @@
#define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7)
#define AFI_INTR_EN_PRSNT_SENSE (1 << 8)
+#define AFI_PCIE_PME 0xf0
+
#define AFI_PCIE_CONFIG 0x0f8
#define AFI_PCIE_CONFIG_PCIE_DISABLE(x) (1 << ((x) + 1))
#define AFI_PCIE_CONFIG_PCIE_DISABLE_ALL 0xe
@@ -288,6 +291,7 @@
#define PADS_REFCLK_CFG_DRVI_SHIFT 12 /* 15:12 */
#define LINK_RETRAIN_TIMEOUT 100000
+#define PME_ACK_TIMEOUT 10000
struct tegra_msi {
struct msi_controller chip;
@@ -315,6 +319,8 @@ struct tegra_pcie_soc {
u32 rp_ectl_4_r2;
u32 rp_ectl_5_r2;
u32 rp_ectl_6_r2;
+ u8 pme_turnoff_bit[3];
+ u8 pme_ack_bit[3];
bool has_pex_clkreq_en;
bool has_pex_bias_ctrl;
bool has_intr_prsnt_sense;
@@ -1461,6 +1467,31 @@ static int tegra_pcie_put_resources(struct tegra_pcie *pcie)
return 0;
}
+static void tegra_pcie_pme_turnoff(struct tegra_pcie_port *port)
+{
+ struct tegra_pcie *pcie = port->pcie;
+ const struct tegra_pcie_soc *soc = pcie->soc;
+ int err;
+ u32 val;
+
+ val = afi_readl(pcie, AFI_PCIE_PME);
+ val |= (0x1 << soc->pme_turnoff_bit[port->index]);
+ afi_writel(pcie, val, AFI_PCIE_PME);
+
+ err = readl_poll_timeout(pcie->afi + AFI_PCIE_PME, val,
+ val & (0x1 << soc->pme_ack_bit[port->index]),
+ 1, PME_ACK_TIMEOUT);
+ if (err)
+ dev_err(pcie->dev, "PME Ack is not received on port: %d\n",
+ port->index);
+
+ usleep_range(10000, 11000);
+
+ val = afi_readl(pcie, AFI_PCIE_PME);
+ val &= ~(0x1 << soc->pme_turnoff_bit[port->index]);
+ afi_writel(pcie, val, AFI_PCIE_PME);
+}
+
static int tegra_msi_alloc(struct tegra_msi *chip)
{
int msi;
@@ -2389,6 +2420,8 @@ static const struct tegra_pcie_soc tegra20_pcie = {
.pads_pll_ctl = PADS_PLL_CTL_TEGRA20,
.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10,
.pads_refclk_cfg0 = 0xfa5cfa5c,
+ .pme_turnoff_bit = {0, 8},
+ .pme_ack_bit = {5, 10},
.has_pex_clkreq_en = false,
.has_pex_bias_ctrl = false,
.has_intr_prsnt_sense = false,
@@ -2411,6 +2444,8 @@ static const struct tegra_pcie_soc tegra30_pcie = {
.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
.pads_refclk_cfg0 = 0xfa5cfa5c,
.pads_refclk_cfg1 = 0xfa5cfa5c,
+ .pme_turnoff_bit = {0, 8, 16},
+ .pme_ack_bit = {5, 10, 18},
.has_pex_clkreq_en = true,
.has_pex_bias_ctrl = true,
.has_intr_prsnt_sense = true,
@@ -2432,6 +2467,8 @@ static const struct tegra_pcie_soc tegra124_pcie = {
.pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
.pads_refclk_cfg0 = 0x44ac44ac,
+ .pme_turnoff_bit = {0, 8},
+ .pme_ack_bit = {5, 10},
.has_pex_clkreq_en = true,
.has_pex_bias_ctrl = true,
.has_intr_prsnt_sense = true,
@@ -2453,6 +2490,8 @@ static const struct tegra_pcie_soc tegra210_pcie = {
.pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
.pads_refclk_cfg0 = 0x90b890b8,
+ .pme_turnoff_bit = {0, 8},
+ .pme_ack_bit = {5, 10},
.rp_ectl_2_r1 = 0x0000000f,
.rp_ectl_4_r1 = 0x00000067,
.rp_ectl_5_r1 = 0x55010000,
@@ -2483,6 +2522,8 @@ static const struct tegra_pcie_soc tegra186_pcie = {
.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
.pads_refclk_cfg0 = 0x80b880b8,
.pads_refclk_cfg1 = 0x000480b8,
+ .pme_turnoff_bit = {0, 8, 12},
+ .pme_ack_bit = {5, 10, 14},
.has_pex_clkreq_en = true,
.has_pex_bias_ctrl = true,
.has_intr_prsnt_sense = true,
@@ -2722,6 +2763,7 @@ static int tegra_pcie_remove(struct platform_device *pdev)
{
struct tegra_pcie *pcie = platform_get_drvdata(pdev);
struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
+ struct tegra_pcie_port *port, *tmp;
if (IS_ENABLED(CONFIG_DEBUG_FS))
tegra_pcie_debugfs_exit(pcie);
@@ -2729,6 +2771,8 @@ static int tegra_pcie_remove(struct platform_device *pdev)
pci_remove_root_bus(host->bus);
if (IS_ENABLED(CONFIG_PCI_MSI))
tegra_pcie_disable_msi(pcie);
+ list_for_each_entry_safe(port, tmp, &pcie->ports, list)
+ tegra_pcie_pme_turnoff(port);
tegra_pcie_disable_ports(pcie);
tegra_pcie_free_resources(pcie);
tegra_pcie_disable_controller(pcie);
--
2.1.4
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