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path: root/drivers/pci/host/pci-tegra.c
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Diffstat (limited to 'drivers/pci/host/pci-tegra.c')
-rw-r--r--drivers/pci/host/pci-tegra.c277
1 files changed, 237 insertions, 40 deletions
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index 0fb0fdb223d5..3d43874319be 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -38,6 +38,7 @@
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/pci.h>
+#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/sizes.h>
@@ -115,13 +116,20 @@
#define AFI_INTR_CODE 0xb8
#define AFI_INTR_CODE_MASK 0xf
-#define AFI_INTR_AXI_SLAVE_ERROR 1
-#define AFI_INTR_AXI_DECODE_ERROR 2
+#define AFI_INTR_INI_SLAVE_ERROR 1
+#define AFI_INTR_INI_DECODE_ERROR 2
#define AFI_INTR_TARGET_ABORT 3
#define AFI_INTR_MASTER_ABORT 4
#define AFI_INTR_INVALID_WRITE 5
#define AFI_INTR_LEGACY 6
#define AFI_INTR_FPCI_DECODE_ERROR 7
+#define AFI_INTR_AXI_DECODE_ERROR 8
+#define AFI_INTR_FPCI_TIMEOUT 9
+#define AFI_INTR_PE_PRSNT_SENSE 10
+#define AFI_INTR_PE_CLKREQ_SENSE 11
+#define AFI_INTR_CLKCLAMP_SENSE 12
+#define AFI_INTR_RDY4PD_SENSE 13
+#define AFI_INTR_P2P_ERROR 14
#define AFI_INTR_SIGNATURE 0xbc
#define AFI_UPPER_FPCI_ADDRESS 0xc0
@@ -152,8 +160,10 @@
#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_X2_X1 (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_X4_X1 (0x1 << 20)
#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411 (0x2 << 20)
#define AFI_FUSE 0x104
@@ -165,12 +175,21 @@
#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_PEX_CTRL_OVERRIDE_EN (1 << 4)
+
+#define AFI_PLLE_CONTROL 0x160
+#define AFI_PLLE_CONTROL_BYPASS_PADS2PLLE_CONTROL (1 << 9)
+#define AFI_PLLE_CONTROL_PADS2PLLE_CONTROL_EN (1 << 1)
#define AFI_PEXBIAS_CTRL_0 0x168
#define RP_VEND_XP 0x00000F00
#define RP_VEND_XP_DL_UP (1 << 30)
+#define RP_PRIV_MISC 0x00000FE0
+#define RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT (0xE << 0)
+#define RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT (0xF << 0)
+
#define RP_LINK_CONTROL_STATUS 0x00000090
#define RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE 0x20000000
#define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000
@@ -197,6 +216,7 @@
#define PADS_REFCLK_CFG0 0x000000C8
#define PADS_REFCLK_CFG1 0x000000CC
+#define PADS_REFCLK_BIAS 0x000000D0
/*
* Fields in PADS_REFCLK_CFG*. Those registers form an array of 16-bit
@@ -236,6 +256,7 @@ struct tegra_pcie_soc_data {
bool has_pex_bias_ctrl;
bool has_intr_prsnt_sense;
bool has_cml_clk;
+ bool has_gen2;
};
static inline struct tegra_msi *to_tegra_msi(struct msi_chip *chip)
@@ -253,6 +274,7 @@ struct tegra_pcie {
struct list_head buses;
struct resource *cs;
+ struct resource all;
struct resource io;
struct resource mem;
struct resource prefetch;
@@ -267,6 +289,8 @@ struct tegra_pcie {
struct reset_control *afi_rst;
struct reset_control *pcie_xrst;
+ struct phy *phy;
+
struct tegra_msi msi;
struct list_head ports;
@@ -382,7 +406,7 @@ static struct tegra_pcie_bus *tegra_pcie_bus_alloc(struct tegra_pcie *pcie,
for (i = 0; i < 16; i++) {
unsigned long virt = (unsigned long)bus->area->addr +
i * SZ_64K;
- phys_addr_t phys = cs + i * SZ_1M + busnr * SZ_64K;
+ phys_addr_t phys = cs + i * SZ_16M + busnr * SZ_64K;
err = ioremap_page_range(virt, virt + SZ_64K, phys, prot);
if (err < 0) {
@@ -561,6 +585,8 @@ static void tegra_pcie_port_enable(struct tegra_pcie_port *port)
if (soc->has_pex_clkreq_en)
value |= AFI_PEX_CTRL_CLKREQ_EN;
+ value |= AFI_PEX_CTRL_OVERRIDE_EN;
+
afi_writel(port->pcie, value, ctrl);
tegra_pcie_port_reset(port);
@@ -568,6 +594,7 @@ static void tegra_pcie_port_enable(struct tegra_pcie_port *port)
static void tegra_pcie_port_disable(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;
@@ -578,6 +605,10 @@ static void tegra_pcie_port_disable(struct tegra_pcie_port *port)
/* disable reference clock */
value = afi_readl(port->pcie, ctrl);
+
+ if (soc->has_pex_clkreq_en)
+ value &= ~AFI_PEX_CTRL_CLKREQ_EN;
+
value &= ~AFI_PEX_CTRL_REFCLK_EN;
afi_writel(port->pcie, value, ctrl);
}
@@ -626,13 +657,25 @@ DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable);
static int tegra_pcie_setup(int nr, struct pci_sys_data *sys)
{
struct tegra_pcie *pcie = sys_to_pcie(sys);
+ int err;
+ phys_addr_t io_start;
+
+ err = devm_request_resource(pcie->dev, &pcie->all, &pcie->mem);
+ if (err < 0)
+ return err;
+
+ err = devm_request_resource(pcie->dev, &pcie->all, &pcie->prefetch);
+ if (err)
+ return err;
+
+ io_start = pci_pio_to_address(pcie->io.start);
pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
pci_add_resource_offset(&sys->resources, &pcie->prefetch,
sys->mem_offset);
pci_add_resource(&sys->resources, &pcie->busn);
- pci_ioremap_io(nr * SZ_64K, pcie->io.start);
+ pci_ioremap_io(nr * SZ_64K, io_start);
return 1;
}
@@ -684,9 +727,15 @@ static irqreturn_t tegra_pcie_isr(int irq, void *arg)
"Target abort",
"Master abort",
"Invalid write",
+ "Legacy interrupt",
"Response decoding error",
"AXI response decoding error",
"Transaction timeout",
+ "Slot present pin change",
+ "Slot clock request change",
+ "TMS clock ramp change",
+ "TMS ready for power down",
+ "Peer2Peer error",
};
struct tegra_pcie *pcie = arg;
u32 code, signature;
@@ -737,6 +786,7 @@ static irqreturn_t tegra_pcie_isr(int irq, void *arg)
static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
{
u32 fpci_bar, size, axi_address;
+ phys_addr_t io_start = pci_pio_to_address(pcie->io.start);
/* Bar 0: type 1 extended configuration space */
fpci_bar = 0xfe100000;
@@ -749,7 +799,7 @@ static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
/* Bar 1: downstream IO bar */
fpci_bar = 0xfdfc0000;
size = resource_size(&pcie->io);
- axi_address = pcie->io.start;
+ axi_address = io_start;
afi_writel(pcie, axi_address, AFI_AXI_BAR1_START);
afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ);
afi_writel(pcie, fpci_bar, AFI_FPCI_BAR1);
@@ -792,30 +842,27 @@ static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
}
-static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
+static int tegra_pcie_pll_wait(struct tegra_pcie *pcie, unsigned long timeout)
{
const struct tegra_pcie_soc_data *soc = pcie->soc_data;
- struct tegra_pcie_port *port;
- unsigned int timeout;
- unsigned long value;
+ u32 value;
- /* power down PCIe slot clock bias pad */
- if (soc->has_pex_bias_ctrl)
- afi_writel(pcie, 0, AFI_PEXBIAS_CTRL_0);
+ timeout = jiffies + msecs_to_jiffies(timeout);
- /* configure mode and disable all ports */
- value = afi_readl(pcie, AFI_PCIE_CONFIG);
- value &= ~AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK;
- value |= AFI_PCIE_CONFIG_PCIE_DISABLE_ALL | pcie->xbar_config;
-
- list_for_each_entry(port, &pcie->ports, list)
- value &= ~AFI_PCIE_CONFIG_PCIE_DISABLE(port->index);
+ while (time_before(jiffies, timeout)) {
+ value = pads_readl(pcie, soc->pads_pll_ctl);
+ if (value & PADS_PLL_CTL_LOCKDET)
+ return 0;
+ }
- afi_writel(pcie, value, AFI_PCIE_CONFIG);
+ return -ETIMEDOUT;
+}
- value = afi_readl(pcie, AFI_FUSE);
- value |= AFI_FUSE_PCIE_T0_GEN2_DIS;
- afi_writel(pcie, value, AFI_FUSE);
+static int tegra_pcie_phy_enable(struct tegra_pcie *pcie)
+{
+ const struct tegra_pcie_soc_data *soc = pcie->soc_data;
+ u32 value;
+ int err;
/* initialize internal PHY, enable up to 16 PCIE lanes */
pads_writel(pcie, 0x0, PADS_CTL_SEL);
@@ -834,6 +881,13 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
value |= PADS_PLL_CTL_REFCLK_INTERNAL_CML | soc->tx_ref_sel;
pads_writel(pcie, value, soc->pads_pll_ctl);
+ /* reset PLL */
+ value = pads_readl(pcie, soc->pads_pll_ctl);
+ value &= ~PADS_PLL_CTL_RST_B4SM;
+ pads_writel(pcie, value, soc->pads_pll_ctl);
+
+ usleep_range(20, 100);
+
/* take PLL out of reset */
value = pads_readl(pcie, soc->pads_pll_ctl);
value |= PADS_PLL_CTL_RST_B4SM;
@@ -846,15 +900,11 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
pads_writel(pcie, PADS_REFCLK_CFG_VALUE, PADS_REFCLK_CFG1);
/* wait for the PLL to lock */
- timeout = 300;
- do {
- 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");
- return -EBUSY;
- }
- } while (!(value & PADS_PLL_CTL_LOCKDET));
+ err = tegra_pcie_pll_wait(pcie, 500);
+ if (err < 0) {
+ dev_err(pcie->dev, "PLL failed to lock: %d\n", err);
+ return err;
+ }
/* turn off IDDQ override */
value = pads_readl(pcie, PADS_CTL);
@@ -866,6 +916,58 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
value |= PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L;
pads_writel(pcie, value, PADS_CTL);
+ return 0;
+}
+
+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 long value;
+ int err;
+
+ /* enable PLL power down */
+ if (pcie->phy) {
+ value = afi_readl(pcie, AFI_PLLE_CONTROL);
+ value &= ~AFI_PLLE_CONTROL_BYPASS_PADS2PLLE_CONTROL;
+ value |= AFI_PLLE_CONTROL_PADS2PLLE_CONTROL_EN;
+ afi_writel(pcie, value, AFI_PLLE_CONTROL);
+ }
+
+ /* 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;
+ value |= AFI_PCIE_CONFIG_PCIE_DISABLE_ALL | pcie->xbar_config;
+
+ list_for_each_entry(port, &pcie->ports, list)
+ value &= ~AFI_PCIE_CONFIG_PCIE_DISABLE(port->index);
+
+ afi_writel(pcie, value, AFI_PCIE_CONFIG);
+
+ if (soc->has_gen2) {
+ value = afi_readl(pcie, AFI_FUSE);
+ value &= ~AFI_FUSE_PCIE_T0_GEN2_DIS;
+ afi_writel(pcie, value, AFI_FUSE);
+ } else {
+ value = afi_readl(pcie, AFI_FUSE);
+ value |= AFI_FUSE_PCIE_T0_GEN2_DIS;
+ afi_writel(pcie, value, AFI_FUSE);
+ }
+
+ if (!pcie->phy)
+ err = tegra_pcie_phy_enable(pcie);
+ else
+ err = phy_power_on(pcie->phy);
+
+ if (err < 0) {
+ dev_err(pcie->dev, "failed to power on PHY: %d\n", err);
+ return err;
+ }
+
/* take the PCIe interface module out of reset */
reset_control_deassert(pcie->pcie_xrst);
@@ -899,6 +1001,10 @@ static void tegra_pcie_power_off(struct tegra_pcie *pcie)
/* TODO: disable and unprepare clocks? */
+ err = phy_power_off(pcie->phy);
+ if (err < 0)
+ dev_warn(pcie->dev, "failed to power off PHY: %d\n", err);
+
reset_control_assert(pcie->pcie_xrst);
reset_control_assert(pcie->afi_rst);
reset_control_assert(pcie->pex_rst);
@@ -1020,6 +1126,19 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
return err;
}
+ pcie->phy = devm_phy_optional_get(pcie->dev, "pcie");
+ if (IS_ERR(pcie->phy)) {
+ err = PTR_ERR(pcie->phy);
+ dev_err(&pdev->dev, "failed to get PHY: %d\n", err);
+ return err;
+ }
+
+ err = phy_init(pcie->phy);
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to initialize PHY: %d\n", err);
+ return err;
+ }
+
err = tegra_pcie_power_on(pcie);
if (err) {
dev_err(&pdev->dev, "failed to power up: %d\n", err);
@@ -1078,10 +1197,17 @@ poweroff:
static int tegra_pcie_put_resources(struct tegra_pcie *pcie)
{
+ int err;
+
if (pcie->irq > 0)
free_irq(pcie->irq, pcie);
tegra_pcie_power_off(pcie);
+
+ err = phy_exit(pcie->phy);
+ if (err < 0)
+ dev_err(pcie->dev, "failed to teardown PHY: %d\n", err);
+
return 0;
}
@@ -1170,8 +1296,10 @@ static int tegra_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
return hwirq;
irq = irq_create_mapping(msi->domain, hwirq);
- if (!irq)
+ if (!irq) {
+ tegra_msi_free(msi, hwirq);
return -EINVAL;
+ }
irq_set_msi_desc(irq, desc);
@@ -1189,8 +1317,10 @@ static void tegra_msi_teardown_irq(struct msi_chip *chip, unsigned int irq)
{
struct tegra_msi *msi = to_tegra_msi(chip);
struct irq_data *d = irq_get_irq_data(irq);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
- tegra_msi_free(msi, d->hwirq);
+ irq_dispose_mapping(irq);
+ tegra_msi_free(msi, hwirq);
}
static struct irq_chip tegra_msi_irq_chip = {
@@ -1327,7 +1457,19 @@ static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes,
{
struct device_node *np = pcie->dev->of_node;
- if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
+ if (of_device_is_compatible(np, "nvidia,tegra124-pcie")) {
+ switch (lanes) {
+ case 0x0000104:
+ dev_info(pcie->dev, "4x1, 1x1 configuration\n");
+ *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1;
+ return 0;
+
+ case 0x0000102:
+ dev_info(pcie->dev, "2x1, 1x1 configuration\n");
+ *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1;
+ return 0;
+ }
+ } else if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
switch (lanes) {
case 0x00000204:
dev_info(pcie->dev, "4x1, 2x1 configuration\n");
@@ -1435,7 +1577,23 @@ static int tegra_pcie_get_regulators(struct tegra_pcie *pcie, u32 lane_mask)
struct device_node *np = pcie->dev->of_node;
unsigned int i = 0;
- if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
+ if (of_device_is_compatible(np, "nvidia,tegra124-pcie")) {
+ pcie->num_supplies = 7;
+
+ pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
+ sizeof(*pcie->supplies),
+ GFP_KERNEL);
+ if (!pcie->supplies)
+ return -ENOMEM;
+
+ pcie->supplies[i++].supply = "avddio-pex";
+ pcie->supplies[i++].supply = "dvddio-pex";
+ pcie->supplies[i++].supply = "avdd-pex-pll";
+ pcie->supplies[i++].supply = "hvdd-pex";
+ pcie->supplies[i++].supply = "hvdd-pex-pll-e";
+ pcie->supplies[i++].supply = "vddio-pex-ctl";
+ pcie->supplies[i++].supply = "avdd-pll-erefe";
+ } else if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
bool need_pexa = false, need_pexb = false;
/* VDD_PEXA and AVDD_PEXA supply lanes 0 to 3 */
@@ -1514,32 +1672,50 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
struct resource res;
int err;
+ memset(&pcie->all, 0, sizeof(pcie->all));
+ pcie->all.flags = IORESOURCE_MEM;
+ pcie->all.name = np->full_name;
+ pcie->all.start = ~0;
+ pcie->all.end = 0;
+
if (of_pci_range_parser_init(&parser, np)) {
dev_err(pcie->dev, "missing \"ranges\" property\n");
return -EINVAL;
}
for_each_of_pci_range(&parser, &range) {
- of_pci_range_to_resource(&range, np, &res);
+ err = of_pci_range_to_resource(&range, np, &res);
+ if (err < 0)
+ return err;
switch (res.flags & IORESOURCE_TYPE_BITS) {
case IORESOURCE_IO:
memcpy(&pcie->io, &res, sizeof(res));
- pcie->io.name = "I/O";
+ pcie->io.name = np->full_name;
break;
case IORESOURCE_MEM:
if (res.flags & IORESOURCE_PREFETCH) {
memcpy(&pcie->prefetch, &res, sizeof(res));
- pcie->prefetch.name = "PREFETCH";
+ pcie->prefetch.name = "prefetchable";
} else {
memcpy(&pcie->mem, &res, sizeof(res));
- pcie->mem.name = "MEM";
+ pcie->mem.name = "non-prefetchable";
}
break;
}
+
+ if (res.start <= pcie->all.start)
+ pcie->all.start = res.start;
+
+ if (res.end >= pcie->all.end)
+ pcie->all.end = res.end;
}
+ err = devm_request_resource(pcie->dev, &iomem_resource, &pcie->all);
+ if (err < 0)
+ return err;
+
err = of_pci_parse_bus_range(np, &pcie->busn);
if (err < 0) {
dev_err(pcie->dev, "failed to parse ranges property: %d\n",
@@ -1641,6 +1817,12 @@ static bool tegra_pcie_port_check_link(struct tegra_pcie_port *port)
unsigned int retries = 3;
unsigned long value;
+ /* override presence detection */
+ value = readl(port->base + RP_PRIV_MISC);
+ value &= ~RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT;
+ value |= RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT;
+ writel(value, port->base + RP_PRIV_MISC);
+
do {
unsigned int timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
@@ -1721,6 +1903,7 @@ static const struct tegra_pcie_soc_data tegra20_pcie_data = {
.has_pex_bias_ctrl = false,
.has_intr_prsnt_sense = false,
.has_cml_clk = false,
+ .has_gen2 = false,
};
static const struct tegra_pcie_soc_data tegra30_pcie_data = {
@@ -1732,9 +1915,23 @@ static const struct tegra_pcie_soc_data tegra30_pcie_data = {
.has_pex_bias_ctrl = true,
.has_intr_prsnt_sense = true,
.has_cml_clk = true,
+ .has_gen2 = false,
+};
+
+static const struct tegra_pcie_soc_data tegra124_pcie_data = {
+ .num_ports = 2,
+ .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_cml_clk = true,
+ .has_gen2 = true,
};
static const struct of_device_id tegra_pcie_of_match[] = {
+ { .compatible = "nvidia,tegra124-pcie", .data = &tegra124_pcie_data },
{ .compatible = "nvidia,tegra30-pcie", .data = &tegra30_pcie_data },
{ .compatible = "nvidia,tegra20-pcie", .data = &tegra20_pcie_data },
{ },
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-14 22:44:42 +0300