[PATCH 2/4] ARM: tegra: pcie: Add tegra3 support

From: Jay Agarwal
Date: Wed May 08 2013 - 06:59:46 EST

- Enable PCIe root port 2 for Cardhu
- Make private data structure for each SoC
- Add required Tegra30 clocks and regulators
- Add Tegra30 specific code in enable controller
- Patch is based on remotes/gitorious_thierryreding_linux/tegra/next
- and should be applied on top of this.

Signed-off-by: Jay Agarwal <jagarwal@xxxxxxxxxx>
---
.../bindings/pci/nvidia,tegra20-pcie.txt | 1 +
drivers/pci/host/pci-tegra.c | 145 +++++++++++++++++---
2 files changed, 127 insertions(+), 19 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt b/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt
index 1ebc526..b4c4e42 100644
--- a/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt
@@ -91,6 +91,7 @@ Board DTS:
pcie-controller {
vdd-supply = <&pci_vdd_reg>;
pex-clk-supply = <&pci_clk_reg>;
+ avdd-supply = <&ldo2_reg>; /* required for tegra30 */
status = "okay";

/* root port 00:01.0 */
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index 24085ed..f7fc650 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -51,7 +51,6 @@
#include <mach/powergate.h>

#define INT_PCI_MSI_NR (8 * 32)
-#define TEGRA_MAX_PORTS 2

/* register definitions */

@@ -143,14 +142,15 @@
#define AFI_INTR_EN_DFPCI_DECERR (1 << 5)
#define AFI_INTR_EN_AXI_DECERR (1 << 6)
#define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7)
+#define AFI_INTR_EN_PRSNT_SENSE (1 << 8)

#define AFI_PCIE_CONFIG 0x0f8
#define AFI_PCIE_CONFIG_PCIE_DISABLE(x) (1 << ((x) + 1))
#define AFI_PCIE_CONFIG_PCIE_DISABLE_ALL 0xe
#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK (0xf << 20)
#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE (0x0 << 20)
-#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420 (0x0 << 20)
#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL (0x1 << 20)
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420 (0x0 << 20)
#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222 (0x1 << 20)
#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411 (0x2 << 20)

@@ -161,8 +161,11 @@
#define AFI_PEX1_CTRL 0x118
#define AFI_PEX2_CTRL 0x128
#define AFI_PEX_CTRL_RST (1 << 0)
+#define AFI_PEX_CTRL_CLKREQ_EN (1 << 1)
#define AFI_PEX_CTRL_REFCLK_EN (1 << 3)

+#define AFI_PEXBIAS_CTRL_0 0x168
+
#define RP_VEND_XP 0x00000F00
#define RP_VEND_XP_DL_UP (1 << 30)

@@ -176,7 +179,8 @@
#define PADS_CTL_TX_DATA_EN_1L (1 << 6)
#define PADS_CTL_RX_DATA_EN_1L (1 << 10)

-#define PADS_PLL_CTL 0x000000B8
+#define PADS_PLL_CTL_T20 0x000000B8
+#define PADS_PLL_CTL_T30 0x000000B4
#define PADS_PLL_CTL_RST_B4SM (1 << 1)
#define PADS_PLL_CTL_LOCKDET (1 << 8)
#define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16)
@@ -184,8 +188,11 @@
#define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (1 << 16)
#define PADS_PLL_CTL_REFCLK_EXTERNAL (2 << 16)
#define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20)
+#define PADS_PLL_CTL_TXCLKREF_BUF_EN (1 << 22)
#define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20)
#define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20)
+#define PADS_REFCLK_CFG0 0x000000C8
+#define PADS_REFCLK_CFG1 0x000000CC

struct tegra_msi {
DECLARE_BITMAP(used, INT_PCI_MSI_NR);
@@ -196,6 +203,19 @@ struct tegra_msi {
int irq;
};

+/* used to differentiate tegra chips code */
+struct tegra_pcie_soc_data {
+ unsigned int num_max_ports;
+ unsigned int pads_pll_ctl;
+ unsigned int tx_ref_sel;
+ unsigned int msi_base_shift;
+ bool pex_clkreq_en;
+ bool pex_bias_ctrl;
+ bool intr_prsnt_sense;
+ bool has_avdd_supply;
+ bool has_cml0_clk;
+};
+
static inline struct tegra_msi *to_tegra_msi(struct msi_chip *chip)
{
return container_of(chip, struct tegra_msi, chip);
@@ -220,6 +240,7 @@ struct tegra_pcie {
struct clk *afi_clk;
struct clk *pcie_xclk;
struct clk *pll_e;
+ struct clk *cml0_clk;

struct tegra_msi msi;

@@ -229,6 +250,9 @@ struct tegra_pcie {

struct regulator *pex_clk_supply;
struct regulator *vdd_supply;
+ struct regulator *avdd_supply;
+
+ struct tegra_pcie_soc_data *soc_data;
};

struct tegra_pcie_port {
@@ -511,12 +535,15 @@ static void tegra_pcie_port_reset(struct tegra_pcie_port *port)

static void tegra_pcie_port_enable(struct tegra_pcie_port *port)
{
+ struct tegra_pcie_soc_data *soc = port->pcie->soc_data;
unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
unsigned long value;

/* enable reference clock */
value = afi_readl(port->pcie, ctrl);
value |= AFI_PEX_CTRL_REFCLK_EN;
+ if (soc->pex_clkreq_en)
+ value |= AFI_PEX_CTRL_CLKREQ_EN;
afi_writel(port->pcie, value, ctrl);

tegra_pcie_port_reset(port);
@@ -569,6 +596,8 @@ static void tegra_pcie_fixup_class(struct pci_dev *dev)
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class);
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_fixup_class);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_fixup_class);

/* Tegra PCIE requires relaxed ordering */
static void tegra_pcie_relax_enable(struct pci_dev *dev)
@@ -749,6 +778,11 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
struct tegra_pcie_port *port;
unsigned int timeout;
unsigned long value;
+ struct tegra_pcie_soc_data *soc = pcie->soc_data;
+
+ /* power down to PCIe slot clock bias pad */
+ if (soc->pex_bias_ctrl)
+ afi_writel(pcie, 0, AFI_PEXBIAS_CTRL_0);

/* configure mode and disable all ports */
value = afi_readl(pcie, AFI_PCIE_CONFIG);
@@ -776,26 +810,26 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
* Set up PHY PLL inputs select PLLE output as refclock,
* set TX ref sel to div10 (not div5).
*/
- value = pads_readl(pcie, PADS_PLL_CTL);
+ value = pads_readl(pcie, soc->pads_pll_ctl);
value &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK);
- value |= (PADS_PLL_CTL_REFCLK_INTERNAL_CML | PADS_PLL_CTL_TXCLKREF_DIV10);
- pads_writel(pcie, value, PADS_PLL_CTL);
+ value |= PADS_PLL_CTL_REFCLK_INTERNAL_CML | soc->tx_ref_sel;
+ pads_writel(pcie, value, soc->pads_pll_ctl);

/* take PLL out of reset */
- value = pads_readl(pcie, PADS_PLL_CTL);
+ value = pads_readl(pcie, soc->pads_pll_ctl);
value |= PADS_PLL_CTL_RST_B4SM;
- pads_writel(pcie, value, PADS_PLL_CTL);
+ pads_writel(pcie, value, soc->pads_pll_ctl);

/*
* Hack, set the clock voltage to the DEFAULT provided by hw folks.
* This doesn't exist in the documentation.
*/
- pads_writel(pcie, 0xfa5cfa5c, 0xc8);
+ pads_writel(pcie, 0xfa5cfa5c, PADS_REFCLK_CFG0);

/* wait for the PLL to lock */
timeout = 300;
do {
- value = pads_readl(pcie, PADS_PLL_CTL);
+ value = pads_readl(pcie, soc->pads_pll_ctl);
usleep_range(1000, 1000);
if (--timeout == 0) {
pr_err("Tegra PCIe error: timeout waiting for PLL\n");
@@ -824,6 +858,8 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
value = AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR |
AFI_INTR_EN_TGT_SLVERR | AFI_INTR_EN_TGT_DECERR |
AFI_INTR_EN_TGT_WRERR | AFI_INTR_EN_DFPCI_DECERR;
+ if (soc->intr_prsnt_sense)
+ value |= AFI_INTR_EN_PRSNT_SENSE;
afi_writel(pcie, value, AFI_AFI_INTR_ENABLE);
afi_writel(pcie, 0xffffffff, AFI_SM_INTR_ENABLE);

@@ -838,6 +874,7 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)

static void tegra_pcie_power_off(struct tegra_pcie *pcie)
{
+ struct tegra_pcie_soc_data *soc = pcie->soc_data;
int err;

/* TODO: disable and unprepare clocks? */
@@ -849,19 +886,26 @@ static void tegra_pcie_power_off(struct tegra_pcie *pcie)
tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
tegra_pmc_pcie_xclk_clamp(true);

+ if (soc->has_avdd_supply) {
+ err = regulator_disable(pcie->avdd_supply);
+ if (err < 0)
+ dev_warn(pcie->dev, "failed to disable AVDD regulator: %d\n",
+ err);
+ }
err = regulator_disable(pcie->pex_clk_supply);
if (err < 0)
- dev_err(pcie->dev, "failed to disable pex-clk regulator: %d\n",
+ dev_warn(pcie->dev, "failed to disable pex-clk regulator: %d\n",
err);

err = regulator_disable(pcie->vdd_supply);
if (err < 0)
- dev_err(pcie->dev, "failed to disable VDD regulator: %d\n",
+ dev_warn(pcie->dev, "failed to disable VDD regulator: %d\n",
err);
}

static int tegra_pcie_power_on(struct tegra_pcie *pcie)
{
+ struct tegra_pcie_soc_data *soc = pcie->soc_data;
int err;

tegra_periph_reset_assert(pcie->pcie_xclk);
@@ -885,6 +929,15 @@ static int tegra_pcie_power_on(struct tegra_pcie *pcie)
return err;
}

+ if (soc->has_avdd_supply) {
+ err = regulator_enable(pcie->avdd_supply);
+ if (err < 0) {
+ dev_err(pcie->dev, "failed to enable AVDD regulator: %d\n",
+ err);
+ return err;
+ }
+ }
+
err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE,
pcie->pex_clk);
if (err) {
@@ -902,6 +955,15 @@ static int tegra_pcie_power_on(struct tegra_pcie *pcie)
return err;
}

+ if (soc->has_cml0_clk) {
+ err = clk_prepare_enable(pcie->cml0_clk);
+ if (err < 0) {
+ dev_err(pcie->dev, "failed to enable cml0 clock: %d\n",
+ err);
+ return err;
+ }
+ }
+
err = clk_prepare_enable(pcie->pll_e);
if (err < 0) {
dev_err(pcie->dev, "failed to enable PLLE clock: %d\n", err);
@@ -913,6 +975,8 @@ static int tegra_pcie_power_on(struct tegra_pcie *pcie)

static int tegra_pcie_clocks_get(struct tegra_pcie *pcie)
{
+ struct tegra_pcie_soc_data *soc = pcie->soc_data;
+
pcie->pex_clk = devm_clk_get(pcie->dev, "pex");
if (IS_ERR(pcie->pex_clk))
return PTR_ERR(pcie->pex_clk);
@@ -929,6 +993,11 @@ static int tegra_pcie_clocks_get(struct tegra_pcie *pcie)
if (IS_ERR(pcie->pll_e))
return PTR_ERR(pcie->pll_e);

+ if (soc->has_cml0_clk) {
+ pcie->cml0_clk = devm_clk_get(pcie->dev, "cml0");
+ if (IS_ERR(pcie->cml0_clk))
+ return PTR_ERR(pcie->cml0_clk);
+ }
return 0;
}

@@ -1151,6 +1220,7 @@ static int tegra_pcie_enable_msi(struct tegra_pcie *pcie)
{
struct platform_device *pdev = to_platform_device(pcie->dev);
struct tegra_msi *msi = &pcie->msi;
+ struct tegra_pcie_soc_data *soc = pcie->soc_data;
unsigned long base;
int err;
u32 reg;
@@ -1187,7 +1257,7 @@ static int tegra_pcie_enable_msi(struct tegra_pcie *pcie)
msi->pages = __get_free_pages(GFP_KERNEL, 3);
base = virt_to_phys((void *)msi->pages);

- afi_writel(pcie, base, AFI_MSI_FPCI_BAR_ST);
+ afi_writel(pcie, base >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST);
afi_writel(pcie, base, AFI_MSI_AXI_BAR_ST);
/* this register is in 4K increments */
afi_writel(pcie, 1, AFI_MSI_BAR_SZ);
@@ -1284,6 +1354,7 @@ static u32 tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes)
static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
{
struct device_node *np = pcie->dev->of_node, *port;
+ struct tegra_pcie_soc_data *soc = pcie->soc_data;
const __be32 *range = NULL;
struct resource res;
u32 lanes = 0;
@@ -1297,6 +1368,12 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
if (IS_ERR(pcie->pex_clk_supply))
return PTR_ERR(pcie->pex_clk_supply);

+ if (soc->has_avdd_supply) {
+ pcie->avdd_supply = devm_regulator_get(pcie->dev, "avdd");
+ if (IS_ERR(pcie->avdd_supply))
+ return PTR_ERR(pcie->avdd_supply);
+ }
+
while ((range = of_pci_process_ranges(np, &res, range)) != NULL) {
switch (res.flags & IORESOURCE_TYPE_BITS) {
case IORESOURCE_IO:
@@ -1341,7 +1418,7 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)

index = PCI_SLOT(err);

- if (index < 1 || index > TEGRA_MAX_PORTS) {
+ if (index < 1 || index > pcie->soc_data->num_max_ports) {
dev_err(pcie->dev, "invalid port number: %d\n", index);
return -EINVAL;
}
@@ -1477,8 +1554,39 @@ static int tegra_pcie_enable(struct tegra_pcie *pcie)
return 0;
}

+static const struct tegra_pcie_soc_data tegra20_pcie_data = {
+ .num_max_ports = 2,
+ .pads_pll_ctl = PADS_PLL_CTL_T20,
+ .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10,
+ .msi_base_shift = 0,
+ .pex_clkreq_en = false,
+ .pex_bias_ctrl = false,
+ .intr_prsnt_sense = false,
+ .has_avdd_supply = false,
+ .has_cml0_clk = false,
+};
+
+static const struct tegra_pcie_soc_data tegra30_pcie_data = {
+ .num_max_ports = 3,
+ .pads_pll_ctl = PADS_PLL_CTL_T30,
+ .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
+ .msi_base_shift = 8,
+ .pex_clkreq_en = true,
+ .pex_bias_ctrl = true,
+ .intr_prsnt_sense = true,
+ .has_avdd_supply = true,
+ .has_cml0_clk = true,
+};
+
+static const struct of_device_id tegra_pcie_of_match[] = {
+ { .compatible = "nvidia,tegra30-pcie", .data = &tegra30_pcie_data},
+ { .compatible = "nvidia,tegra20-pcie", .data = &tegra20_pcie_data},
+ { },
+};
+
static int tegra_pcie_probe(struct platform_device *pdev)
{
+ const struct of_device_id *match;
struct tegra_pcie *pcie;
int err;

@@ -1489,6 +1597,10 @@ static int tegra_pcie_probe(struct platform_device *pdev)
INIT_LIST_HEAD(&pcie->busses);
INIT_LIST_HEAD(&pcie->ports);
pcie->dev = &pdev->dev;
+ match = of_match_device(tegra_pcie_of_match, &pdev->dev);
+ if (!match)
+ return -ENODEV;
+ pcie->soc_data = (struct tegra_pcie_soc_data *)match->data;

err = tegra_pcie_parse_dt(pcie);
if (err < 0)
@@ -1560,11 +1672,6 @@ static int tegra_pcie_remove(struct platform_device *pdev)
return 0;
}

-static const struct of_device_id tegra_pcie_of_match[] = {
- { .compatible = "nvidia,tegra20-pcie", },
- { },
-};
-
static struct platform_driver tegra_pcie_driver = {
.driver = {
.name = "tegra-pcie",
--
1.7.0.4

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