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PCI: tegra: Add Tegra 30 PCIe support

Browse Source 
Introduce a data structure to parameterize the driver according to SoC
generation, add Tegra30 specific code and update the device tree binding
document for Tegra30 support.

Signed-off-by: Jay Agarwal <jagarwal@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Jay Agarwal 2013-08-09 16:49:24 +02:00 committed by Stephen Warren
parent d1523b52bf
commit 94716cddbe
2 changed files with 178 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt
View File

@ -1,7 +1,7 @@
NVIDIA Tegra PCIe controller
Required properties:
- compatible: "nvidia,tegra20-pcie"
- compatible: "nvidia,tegra20-pcie" or "nvidia,tegra30-pcie"
- device_type: Must be "pci"
- reg: A list of physical base address and length for each set of controller
registers. Must contain an entry for each entry in the reg-names property.
@ -16,6 +16,7 @@ Required properties:
"msi": The Tegra interrupt that is asserted when an MSI is received
- pex-clk-supply: Supply voltage for internal reference clock
- vdd-supply: Power supply for controller (1.05V)
- avdd-supply: Power supply for controller (1.05V) (not required for Tegra20)
- bus-range: Range of bus numbers associated with this controller
- #address-cells: Address representation for root ports (must be 3)
- cell 0 specifies the bus and device numbers of the root port:
@ -48,6 +49,7 @@ Required properties:
"afi": The Tegra clock of that name
"pcie_xclk": The Tegra clock of that name
"pll_e": The Tegra clock of that name
"cml": The Tegra clock of that name (not required for Tegra20)
Root ports are defined as subnodes of the PCIe controller node.

207
drivers/pci/host/pci-tegra.c
View File

@ -1,5 +1,5 @@
/*
* PCIe host controller driver for TEGRA(2) SOCs
* PCIe host controller driver for Tegra SoCs
*
* Copyright (c) 2010, CompuLab, Ltd.
* Author: Mike Rapoport <mike@compulab.co.il>
@ -50,7 +50,6 @@
#include <asm/mach/pci.h>
#define INT_PCI_MSI_NR (8 * 32)
#define TEGRA_MAX_PORTS 2
/* register definitions */
@ -142,22 +141,30 @@
#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_222 (0x1 << 20)
#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411 (0x2 << 20)
#define AFI_FUSE 0x104
#define AFI_FUSE_PCIE_T0_GEN2_DIS (1 << 2)
#define AFI_PEX0_CTRL 0x110
#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)
@ -172,7 +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_TEGRA20 0x000000B8
#define PADS_PLL_CTL_TEGRA30 0x000000B4
#define PADS_PLL_CTL_RST_B4SM (1 << 1)
#define PADS_PLL_CTL_LOCKDET (1 << 8)
#define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16)
@ -182,6 +190,10 @@
#define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20)
#define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20)
#define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20)
#define PADS_PLL_CTL_TXCLKREF_BUF_EN (1 << 22)
#define PADS_REFCLK_CFG0 0x000000C8
#define PADS_REFCLK_CFG1 0x000000CC
struct tegra_msi {
struct msi_chip chip;
@ -192,6 +204,19 @@ struct tegra_msi {
int irq;
};
/* used to differentiate between Tegra SoC generations */
struct tegra_pcie_soc_data {
unsigned int num_ports;
unsigned int msi_base_shift;
u32 pads_pll_ctl;
u32 tx_ref_sel;
bool has_pex_clkreq_en;
bool has_pex_bias_ctrl;
bool has_intr_prsnt_sense;
bool has_avdd_supply;
bool has_cml_clk;
};
static inline struct tegra_msi *to_tegra_msi(struct msi_chip *chip)
{
return container_of(chip, struct tegra_msi, chip);
@ -216,6 +241,7 @@ struct tegra_pcie {
struct clk *afi_clk;
struct clk *pcie_xclk;
struct clk *pll_e;
struct clk *cml_clk;
struct tegra_msi msi;
@ -225,6 +251,9 @@ struct tegra_pcie {
struct regulator *pex_clk_supply;
struct regulator *vdd_supply;
struct regulator *avdd_supply;
const struct tegra_pcie_soc_data *soc_data;
};
struct tegra_pcie_port {
@ -469,6 +498,10 @@ static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port)
case 1:
ret = AFI_PEX1_CTRL;
break;
case 2:
ret = AFI_PEX2_CTRL;
break;
}
return ret;
@ -493,12 +526,17 @@ static void tegra_pcie_port_reset(struct tegra_pcie_port *port)
static void tegra_pcie_port_enable(struct tegra_pcie_port *port)
{
const 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->has_pex_clkreq_en)
value |= AFI_PEX_CTRL_CLKREQ_EN;
afi_writel(port->pcie, value, ctrl);
tegra_pcie_port_reset(port);
@ -551,6 +589,8 @@ 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)
@ -723,10 +763,15 @@ static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
{
const struct tegra_pcie_soc_data *soc = pcie->soc_data;
struct tegra_pcie_port *port;
unsigned int timeout;
unsigned long value;
/* power down PCIe slot clock bias pad */
if (soc->has_pex_bias_ctrl)
afi_writel(pcie, 0, AFI_PEXBIAS_CTRL_0);
/* configure mode and disable all ports */
value = afi_readl(pcie, AFI_PCIE_CONFIG);
value &= ~AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK;
@ -753,27 +798,26 @@ 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, 2000);
if (--timeout == 0) {
pr_err("Tegra PCIe error: timeout waiting for PLL\n");
@ -802,6 +846,10 @@ 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->has_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);
@ -816,6 +864,7 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
static void tegra_pcie_power_off(struct tegra_pcie *pcie)
{
const struct tegra_pcie_soc_data *soc = pcie->soc_data;
int err;
/* TODO: disable and unprepare clocks? */
@ -826,19 +875,28 @@ static void tegra_pcie_power_off(struct tegra_pcie *pcie)
tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
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",
err);
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",
err);
dev_warn(pcie->dev, "failed to disable VDD regulator: %d\n",
err);
}
static int tegra_pcie_power_on(struct tegra_pcie *pcie)
{
const struct tegra_pcie_soc_data *soc = pcie->soc_data;
int err;
tegra_periph_reset_assert(pcie->pcie_xclk);
@ -861,6 +919,16 @@ 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) {
@ -876,6 +944,15 @@ static int tegra_pcie_power_on(struct tegra_pcie *pcie)
return err;
}
if (soc->has_cml_clk) {
err = clk_prepare_enable(pcie->cml_clk);
if (err < 0) {
dev_err(pcie->dev, "failed to enable CML 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);
@ -887,6 +964,8 @@ static int tegra_pcie_power_on(struct tegra_pcie *pcie)
static int tegra_pcie_clocks_get(struct tegra_pcie *pcie)
{
const 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);
@ -903,6 +982,12 @@ 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_cml_clk) {
pcie->cml_clk = devm_clk_get(pcie->dev, "cml");
if (IS_ERR(pcie->cml_clk))
return PTR_ERR(pcie->cml_clk);
}
return 0;
}
@ -1127,6 +1212,7 @@ static const struct irq_domain_ops msi_domain_ops = {
static int tegra_pcie_enable_msi(struct tegra_pcie *pcie)
{
struct platform_device *pdev = to_platform_device(pcie->dev);
const struct tegra_pcie_soc_data *soc = pcie->soc_data;
struct tegra_msi *msi = &pcie->msi;
unsigned long base;
int err;
@ -1164,7 +1250,7 @@ static int tegra_pcie_enable_msi(struct tegra_pcie *pcie)
msi->pages = __get_free_pages(GFP_KERNEL, 0);
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);
@ -1233,16 +1319,35 @@ static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes,
{
struct device_node *np = pcie->dev->of_node;
switch (lanes) {
case 0x00000004:
dev_info(pcie->dev, "single-mode configuration\n");
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE;
return 0;
if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
switch (lanes) {
case 0x00000204:
dev_info(pcie->dev, "4x1, 2x1 configuration\n");
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420;
return 0;
case 0x00000202:
dev_info(pcie->dev, "dual-mode configuration\n");
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL;
return 0;
case 0x00020202:
dev_info(pcie->dev, "2x3 configuration\n");
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222;
return 0;
case 0x00010104:
dev_info(pcie->dev, "4x1, 1x2 configuration\n");
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411;
return 0;
}
} else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
switch (lanes) {
case 0x00000004:
dev_info(pcie->dev, "single-mode configuration\n");
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE;
return 0;
case 0x00000202:
dev_info(pcie->dev, "dual-mode configuration\n");
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL;
return 0;
}
}
return -EINVAL;
@ -1250,6 +1355,7 @@ static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes,
static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
{
const struct tegra_pcie_soc_data *soc = pcie->soc_data;
struct device_node *np = pcie->dev->of_node, *port;
struct of_pci_range_parser parser;
struct of_pci_range range;
@ -1270,6 +1376,12 @@ 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);
}
for_each_of_pci_range(&parser, &range) {
of_pci_range_to_resource(&range, np, &res);
@ -1316,7 +1428,7 @@ 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 > soc->num_ports) {
dev_err(pcie->dev, "invalid port number: %d\n", index);
return -EINVAL;
}
@ -1454,17 +1566,54 @@ static int tegra_pcie_enable(struct tegra_pcie *pcie)
return 0;
}
static const struct tegra_pcie_soc_data tegra20_pcie_data = {
.num_ports = 2,
.msi_base_shift = 0,
.pads_pll_ctl = PADS_PLL_CTL_TEGRA20,
.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10,
.has_pex_clkreq_en = false,
.has_pex_bias_ctrl = false,
.has_intr_prsnt_sense = false,
.has_avdd_supply = false,
.has_cml_clk = false,
};
static const struct tegra_pcie_soc_data tegra30_pcie_data = {
.num_ports = 3,
.msi_base_shift = 8,
.pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
.has_pex_clkreq_en = true,
.has_pex_bias_ctrl = true,
.has_intr_prsnt_sense = true,
.has_avdd_supply = true,
.has_cml_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 },
{ },
};
MODULE_DEVICE_TABLE(of, tegra_pcie_of_match);
static int tegra_pcie_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
struct tegra_pcie *pcie;
int err;
match = of_match_device(tegra_pcie_of_match, &pdev->dev);
if (!match)
return -ENODEV;
pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
if (!pcie)
return -ENOMEM;
INIT_LIST_HEAD(&pcie->busses);
INIT_LIST_HEAD(&pcie->ports);
pcie->soc_data = match->data;
pcie->dev = &pdev->dev;
err = tegra_pcie_parse_dt(pcie);
@ -1513,12 +1662,6 @@ static int tegra_pcie_probe(struct platform_device *pdev)
return err;
}
static const struct of_device_id tegra_pcie_of_match[] = {
{ .compatible = "nvidia,tegra20-pcie", },
{ },
};
MODULE_DEVICE_TABLE(of, tegra_pcie_of_match);
static struct platform_driver tegra_pcie_driver = {
.driver = {
.name = "tegra-pcie",