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authorLinus Torvalds <torvalds@linux-foundation.org>2014-08-08 11:34:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-08 11:34:32 -0700
commit10c8e0562057b5d64ea170feab148e1550420030 (patch)
treecfd387208c85e893c93d24e324d147eb6e9abfc9 /drivers/pci
parentd4e1f5a14e17d4f0e8034c0967511884bcb12fba (diff)
parent3e528cb7bae00ba0d73def6645d0f2fa906ee3e8 (diff)
Merge tag 'drivers-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC driver changes from Olof Johansson: "A handful of driver-related changes. We've had a bunch of them going in through other branches as well, so it's only a part of what we really have this release. Larger pieces are: - Removal of a now unused PWM driver for atmel [ This includes AVR32 changes that have been appropriately acked ] - Performance counter support for the arm CCN interconnect - OMAP mailbox driver cleanups and consolidation - PCI and SATA PHY drivers for SPEAr 13xx platforms - Redefinition (with backwards compatibility!) of PCI DT bindings for Tegra to better model regulators/power" Note: this merge also fixes up the semantic conflict with the new calling convention for devm_phy_create(), see commit f0ed817638b5 ("phy: core: Let node ptr of PHY point to PHY and not of PHY provider") that came in through Greg's USB tree. Semantic merge patch by Stephen Rothwell <sfr@canb.auug.org.au> through the next tree. * tag 'drivers-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (38 commits) bus: arm-ccn: Fix error handling at event allocation mailbox/omap: add a parent structure for every IP instance mailbox/omap: remove the private mailbox structure mailbox/omap: consolidate OMAP mailbox driver mailbox/omap: simplify the fifo assignment by using macros mailbox/omap: remove omap_mbox_type_t from mailbox ops mailbox/omap: remove OMAP1 mailbox driver mailbox/omap: use devm_* interfaces bus: ARM CCN: add PERF_EVENTS dependency bus: ARM CCN PMU driver PCI: spear: Remove spear13xx_pcie_remove() PCI: spear: Fix Section mismatch compilation warning for probe() ARM: tegra: Remove legacy PCIe power supply properties PCI: tegra: Remove deprecated power supply properties PCI: tegra: Implement accurate power supply scheme ARM: SPEAr13xx: Update defconfigs ARM: SPEAr13xx: Add pcie and miphy DT nodes ARM: SPEAr13xx: Add bindings and dt node for misc block ARM: SPEAr13xx: Fix static mapping table phy: Add drivers for PCIe and SATA phy on SPEAr13xx ...
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/host/Kconfig8
-rw-r--r--drivers/pci/host/Makefile1
-rw-r--r--drivers/pci/host/pci-tegra.c222
-rw-r--r--drivers/pci/host/pcie-spear13xx.c393
4 files changed, 563 insertions, 61 deletions
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index 21df477be0c..2d8a4d05d78 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -46,4 +46,12 @@ config PCI_HOST_GENERIC
Say Y here if you want to support a simple generic PCI host
controller, such as the one emulated by kvmtool.
+config PCIE_SPEAR13XX
+ tristate "STMicroelectronics SPEAr PCIe controller"
+ depends on ARCH_SPEAR13XX
+ select PCIEPORTBUS
+ select PCIE_DW
+ help
+ Say Y here if you want PCIe support on SPEAr13XX SoCs.
+
endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 611ba4b48c9..0daec7941ab 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
obj-$(CONFIG_PCI_RCAR_GEN2_PCIE) += pcie-rcar.o
obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
+obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index 60a7299e963..abd65784618 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -234,7 +234,6 @@ struct tegra_pcie_soc_data {
bool has_pex_clkreq_en;
bool has_pex_bias_ctrl;
bool has_intr_prsnt_sense;
- bool has_avdd_supply;
bool has_cml_clk;
};
@@ -273,9 +272,8 @@ struct tegra_pcie {
unsigned int num_ports;
u32 xbar_config;
- struct regulator *pex_clk_supply;
- struct regulator *vdd_supply;
- struct regulator *avdd_supply;
+ struct regulator_bulk_data *supplies;
+ unsigned int num_supplies;
const struct tegra_pcie_soc_data *soc_data;
};
@@ -895,7 +893,6 @@ 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? */
@@ -906,23 +903,9 @@ 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);
+ err = regulator_bulk_disable(pcie->num_supplies, pcie->supplies);
if (err < 0)
- dev_warn(pcie->dev, "failed to disable pex-clk regulator: %d\n",
- err);
-
- err = regulator_disable(pcie->vdd_supply);
- if (err < 0)
- dev_warn(pcie->dev, "failed to disable VDD regulator: %d\n",
- err);
+ dev_warn(pcie->dev, "failed to disable regulators: %d\n", err);
}
static int tegra_pcie_power_on(struct tegra_pcie *pcie)
@@ -937,28 +920,9 @@ static int tegra_pcie_power_on(struct tegra_pcie *pcie)
tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
/* enable regulators */
- err = regulator_enable(pcie->vdd_supply);
- if (err < 0) {
- dev_err(pcie->dev, "failed to enable VDD regulator: %d\n", err);
- return err;
- }
-
- err = regulator_enable(pcie->pex_clk_supply);
- if (err < 0) {
- dev_err(pcie->dev, "failed to enable pex-clk regulator: %d\n",
- err);
- 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 = regulator_bulk_enable(pcie->num_supplies, pcie->supplies);
+ if (err < 0)
+ dev_err(pcie->dev, "failed to enable regulators: %d\n", err);
err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE,
pcie->pex_clk,
@@ -1395,14 +1359,157 @@ static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes,
return -EINVAL;
}
+/*
+ * Check whether a given set of supplies is available in a device tree node.
+ * This is used to check whether the new or the legacy device tree bindings
+ * should be used.
+ */
+static bool of_regulator_bulk_available(struct device_node *np,
+ struct regulator_bulk_data *supplies,
+ unsigned int num_supplies)
+{
+ char property[32];
+ unsigned int i;
+
+ for (i = 0; i < num_supplies; i++) {
+ snprintf(property, 32, "%s-supply", supplies[i].supply);
+
+ if (of_find_property(np, property, NULL) == NULL)
+ return false;
+ }
+
+ return true;
+}
+
+/*
+ * Old versions of the device tree binding for this device used a set of power
+ * supplies that didn't match the hardware inputs. This happened to work for a
+ * number of cases but is not future proof. However to preserve backwards-
+ * compatibility with old device trees, this function will try to use the old
+ * set of supplies.
+ */
+static int tegra_pcie_get_legacy_regulators(struct tegra_pcie *pcie)
+{
+ struct device_node *np = pcie->dev->of_node;
+
+ if (of_device_is_compatible(np, "nvidia,tegra30-pcie"))
+ pcie->num_supplies = 3;
+ else if (of_device_is_compatible(np, "nvidia,tegra20-pcie"))
+ pcie->num_supplies = 2;
+
+ if (pcie->num_supplies == 0) {
+ dev_err(pcie->dev, "device %s not supported in legacy mode\n",
+ np->full_name);
+ return -ENODEV;
+ }
+
+ pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
+ sizeof(*pcie->supplies),
+ GFP_KERNEL);
+ if (!pcie->supplies)
+ return -ENOMEM;
+
+ pcie->supplies[0].supply = "pex-clk";
+ pcie->supplies[1].supply = "vdd";
+
+ if (pcie->num_supplies > 2)
+ pcie->supplies[2].supply = "avdd";
+
+ return devm_regulator_bulk_get(pcie->dev, pcie->num_supplies,
+ pcie->supplies);
+}
+
+/*
+ * Obtains the list of regulators required for a particular generation of the
+ * IP block.
+ *
+ * This would've been nice to do simply by providing static tables for use
+ * with the regulator_bulk_*() API, but unfortunately Tegra30 is a bit quirky
+ * in that it has two pairs or AVDD_PEX and VDD_PEX supplies (PEXA and PEXB)
+ * and either seems to be optional depending on which ports are being used.
+ */
+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")) {
+ bool need_pexa = false, need_pexb = false;
+
+ /* VDD_PEXA and AVDD_PEXA supply lanes 0 to 3 */
+ if (lane_mask & 0x0f)
+ need_pexa = true;
+
+ /* VDD_PEXB and AVDD_PEXB supply lanes 4 to 5 */
+ if (lane_mask & 0x30)
+ need_pexb = true;
+
+ pcie->num_supplies = 4 + (need_pexa ? 2 : 0) +
+ (need_pexb ? 2 : 0);
+
+ pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
+ sizeof(*pcie->supplies),
+ GFP_KERNEL);
+ if (!pcie->supplies)
+ return -ENOMEM;
+
+ pcie->supplies[i++].supply = "avdd-pex-pll";
+ pcie->supplies[i++].supply = "hvdd-pex";
+ pcie->supplies[i++].supply = "vddio-pex-ctl";
+ pcie->supplies[i++].supply = "avdd-plle";
+
+ if (need_pexa) {
+ pcie->supplies[i++].supply = "avdd-pexa";
+ pcie->supplies[i++].supply = "vdd-pexa";
+ }
+
+ if (need_pexb) {
+ pcie->supplies[i++].supply = "avdd-pexb";
+ pcie->supplies[i++].supply = "vdd-pexb";
+ }
+ } else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
+ pcie->num_supplies = 5;
+
+ pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
+ sizeof(*pcie->supplies),
+ GFP_KERNEL);
+ if (!pcie->supplies)
+ return -ENOMEM;
+
+ pcie->supplies[0].supply = "avdd-pex";
+ pcie->supplies[1].supply = "vdd-pex";
+ pcie->supplies[2].supply = "avdd-pex-pll";
+ pcie->supplies[3].supply = "avdd-plle";
+ pcie->supplies[4].supply = "vddio-pex-clk";
+ }
+
+ if (of_regulator_bulk_available(pcie->dev->of_node, pcie->supplies,
+ pcie->num_supplies))
+ return devm_regulator_bulk_get(pcie->dev, pcie->num_supplies,
+ pcie->supplies);
+
+ /*
+ * If not all regulators are available for this new scheme, assume
+ * that the device tree complies with an older version of the device
+ * tree binding.
+ */
+ dev_info(pcie->dev, "using legacy DT binding for power supplies\n");
+
+ devm_kfree(pcie->dev, pcie->supplies);
+ pcie->num_supplies = 0;
+
+ return tegra_pcie_get_legacy_regulators(pcie);
+}
+
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;
+ u32 lanes = 0, mask = 0;
+ unsigned int lane = 0;
struct resource res;
- u32 lanes = 0;
int err;
if (of_pci_range_parser_init(&parser, np)) {
@@ -1410,20 +1517,6 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
return -EINVAL;
}
- pcie->vdd_supply = devm_regulator_get(pcie->dev, "vdd");
- if (IS_ERR(pcie->vdd_supply))
- return PTR_ERR(pcie->vdd_supply);
-
- pcie->pex_clk_supply = devm_regulator_get(pcie->dev, "pex-clk");
- 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);
@@ -1491,8 +1584,13 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
lanes |= value << (index << 3);
- if (!of_device_is_available(port))
+ if (!of_device_is_available(port)) {
+ lane += value;
continue;
+ }
+
+ mask |= ((1 << value) - 1) << lane;
+ lane += value;
rp = devm_kzalloc(pcie->dev, sizeof(*rp), GFP_KERNEL);
if (!rp)
@@ -1523,6 +1621,10 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
return err;
}
+ err = tegra_pcie_get_regulators(pcie, mask);
+ if (err < 0)
+ return err;
+
return 0;
}
@@ -1616,7 +1718,6 @@ static const struct tegra_pcie_soc_data tegra20_pcie_data = {
.has_pex_clkreq_en = false,
.has_pex_bias_ctrl = false,
.has_intr_prsnt_sense = false,
- .has_avdd_supply = false,
.has_cml_clk = false,
};
@@ -1628,7 +1729,6 @@ static const struct tegra_pcie_soc_data tegra30_pcie_data = {
.has_pex_clkreq_en = true,
.has_pex_bias_ctrl = true,
.has_intr_prsnt_sense = true,
- .has_avdd_supply = true,
.has_cml_clk = true,
};
diff --git a/drivers/pci/host/pcie-spear13xx.c b/drivers/pci/host/pcie-spear13xx.c
new file mode 100644
index 00000000000..6dea9e43a75
--- /dev/null
+++ b/drivers/pci/host/pcie-spear13xx.c
@@ -0,0 +1,393 @@
+/*
+ * PCIe host controller driver for ST Microelectronics SPEAr13xx SoCs
+ *
+ * SPEAr13xx PCIe Glue Layer Source Code
+ *
+ * Copyright (C) 2010-2014 ST Microelectronics
+ * Pratyush Anand <pratyush.anand@st.com>
+ * Mohit Kumar <mohit.kumar@st.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pci.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/resource.h>
+
+#include "pcie-designware.h"
+
+struct spear13xx_pcie {
+ void __iomem *app_base;
+ struct phy *phy;
+ struct clk *clk;
+ struct pcie_port pp;
+ bool is_gen1;
+};
+
+struct pcie_app_reg {
+ u32 app_ctrl_0; /* cr0 */
+ u32 app_ctrl_1; /* cr1 */
+ u32 app_status_0; /* cr2 */
+ u32 app_status_1; /* cr3 */
+ u32 msg_status; /* cr4 */
+ u32 msg_payload; /* cr5 */
+ u32 int_sts; /* cr6 */
+ u32 int_clr; /* cr7 */
+ u32 int_mask; /* cr8 */
+ u32 mst_bmisc; /* cr9 */
+ u32 phy_ctrl; /* cr10 */
+ u32 phy_status; /* cr11 */
+ u32 cxpl_debug_info_0; /* cr12 */
+ u32 cxpl_debug_info_1; /* cr13 */
+ u32 ven_msg_ctrl_0; /* cr14 */
+ u32 ven_msg_ctrl_1; /* cr15 */
+ u32 ven_msg_data_0; /* cr16 */
+ u32 ven_msg_data_1; /* cr17 */
+ u32 ven_msi_0; /* cr18 */
+ u32 ven_msi_1; /* cr19 */
+ u32 mst_rmisc; /* cr20 */
+};
+
+/* CR0 ID */
+#define RX_LANE_FLIP_EN_ID 0
+#define TX_LANE_FLIP_EN_ID 1
+#define SYS_AUX_PWR_DET_ID 2
+#define APP_LTSSM_ENABLE_ID 3
+#define SYS_ATTEN_BUTTON_PRESSED_ID 4
+#define SYS_MRL_SENSOR_STATE_ID 5
+#define SYS_PWR_FAULT_DET_ID 6
+#define SYS_MRL_SENSOR_CHGED_ID 7
+#define SYS_PRE_DET_CHGED_ID 8
+#define SYS_CMD_CPLED_INT_ID 9
+#define APP_INIT_RST_0_ID 11
+#define APP_REQ_ENTR_L1_ID 12
+#define APP_READY_ENTR_L23_ID 13
+#define APP_REQ_EXIT_L1_ID 14
+#define DEVICE_TYPE_EP (0 << 25)
+#define DEVICE_TYPE_LEP (1 << 25)
+#define DEVICE_TYPE_RC (4 << 25)
+#define SYS_INT_ID 29
+#define MISCTRL_EN_ID 30
+#define REG_TRANSLATION_ENABLE 31
+
+/* CR1 ID */
+#define APPS_PM_XMT_TURNOFF_ID 2
+#define APPS_PM_XMT_PME_ID 5
+
+/* CR3 ID */
+#define XMLH_LTSSM_STATE_DETECT_QUIET 0x00
+#define XMLH_LTSSM_STATE_DETECT_ACT 0x01
+#define XMLH_LTSSM_STATE_POLL_ACTIVE 0x02
+#define XMLH_LTSSM_STATE_POLL_COMPLIANCE 0x03
+#define XMLH_LTSSM_STATE_POLL_CONFIG 0x04
+#define XMLH_LTSSM_STATE_PRE_DETECT_QUIET 0x05
+#define XMLH_LTSSM_STATE_DETECT_WAIT 0x06
+#define XMLH_LTSSM_STATE_CFG_LINKWD_START 0x07
+#define XMLH_LTSSM_STATE_CFG_LINKWD_ACEPT 0x08
+#define XMLH_LTSSM_STATE_CFG_LANENUM_WAIT 0x09
+#define XMLH_LTSSM_STATE_CFG_LANENUM_ACEPT 0x0A
+#define XMLH_LTSSM_STATE_CFG_COMPLETE 0x0B
+#define XMLH_LTSSM_STATE_CFG_IDLE 0x0C
+#define XMLH_LTSSM_STATE_RCVRY_LOCK 0x0D
+#define XMLH_LTSSM_STATE_RCVRY_SPEED 0x0E
+#define XMLH_LTSSM_STATE_RCVRY_RCVRCFG 0x0F
+#define XMLH_LTSSM_STATE_RCVRY_IDLE 0x10
+#define XMLH_LTSSM_STATE_L0 0x11
+#define XMLH_LTSSM_STATE_L0S 0x12
+#define XMLH_LTSSM_STATE_L123_SEND_EIDLE 0x13
+#define XMLH_LTSSM_STATE_L1_IDLE 0x14
+#define XMLH_LTSSM_STATE_L2_IDLE 0x15
+#define XMLH_LTSSM_STATE_L2_WAKE 0x16
+#define XMLH_LTSSM_STATE_DISABLED_ENTRY 0x17
+#define XMLH_LTSSM_STATE_DISABLED_IDLE 0x18
+#define XMLH_LTSSM_STATE_DISABLED 0x19
+#define XMLH_LTSSM_STATE_LPBK_ENTRY 0x1A
+#define XMLH_LTSSM_STATE_LPBK_ACTIVE 0x1B
+#define XMLH_LTSSM_STATE_LPBK_EXIT 0x1C
+#define XMLH_LTSSM_STATE_LPBK_EXIT_TIMEOUT 0x1D
+#define XMLH_LTSSM_STATE_HOT_RESET_ENTRY 0x1E
+#define XMLH_LTSSM_STATE_HOT_RESET 0x1F
+#define XMLH_LTSSM_STATE_MASK 0x3F
+#define XMLH_LINK_UP (1 << 6)
+
+/* CR4 ID */
+#define CFG_MSI_EN_ID 18
+
+/* CR6 */
+#define INTA_CTRL_INT (1 << 7)
+#define INTB_CTRL_INT (1 << 8)
+#define INTC_CTRL_INT (1 << 9)
+#define INTD_CTRL_INT (1 << 10)
+#define MSI_CTRL_INT (1 << 26)
+
+/* CR19 ID */
+#define VEN_MSI_REQ_ID 11
+#define VEN_MSI_FUN_NUM_ID 8
+#define VEN_MSI_TC_ID 5
+#define VEN_MSI_VECTOR_ID 0
+#define VEN_MSI_REQ_EN ((u32)0x1 << VEN_MSI_REQ_ID)
+#define VEN_MSI_FUN_NUM_MASK ((u32)0x7 << VEN_MSI_FUN_NUM_ID)
+#define VEN_MSI_TC_MASK ((u32)0x7 << VEN_MSI_TC_ID)
+#define VEN_MSI_VECTOR_MASK ((u32)0x1F << VEN_MSI_VECTOR_ID)
+
+#define EXP_CAP_ID_OFFSET 0x70
+
+#define to_spear13xx_pcie(x) container_of(x, struct spear13xx_pcie, pp)
+
+static int spear13xx_pcie_establish_link(struct pcie_port *pp)
+{
+ u32 val;
+ int count = 0;
+ struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pp);
+ struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
+ u32 exp_cap_off = EXP_CAP_ID_OFFSET;
+
+ if (dw_pcie_link_up(pp)) {
+ dev_err(pp->dev, "link already up\n");
+ return 0;
+ }
+
+ dw_pcie_setup_rc(pp);
+
+ /*
+ * this controller support only 128 bytes read size, however its
+ * default value in capability register is 512 bytes. So force
+ * it to 128 here.
+ */
+ dw_pcie_cfg_read(pp->dbi_base, exp_cap_off + PCI_EXP_DEVCTL, 4, &val);
+ val &= ~PCI_EXP_DEVCTL_READRQ;
+ dw_pcie_cfg_write(pp->dbi_base, exp_cap_off + PCI_EXP_DEVCTL, 4, val);
+
+ dw_pcie_cfg_write(pp->dbi_base, PCI_VENDOR_ID, 2, 0x104A);
+ dw_pcie_cfg_write(pp->dbi_base, PCI_DEVICE_ID, 2, 0xCD80);
+
+ /*
+ * if is_gen1 is set then handle it, so that some buggy card
+ * also works
+ */
+ if (spear13xx_pcie->is_gen1) {
+ dw_pcie_cfg_read(pp->dbi_base, exp_cap_off + PCI_EXP_LNKCAP, 4,
+ &val);
+ if ((val & PCI_EXP_LNKCAP_SLS) != PCI_EXP_LNKCAP_SLS_2_5GB) {
+ val &= ~((u32)PCI_EXP_LNKCAP_SLS);
+ val |= PCI_EXP_LNKCAP_SLS_2_5GB;
+ dw_pcie_cfg_write(pp->dbi_base, exp_cap_off +
+ PCI_EXP_LNKCAP, 4, val);
+ }
+
+ dw_pcie_cfg_read(pp->dbi_base, exp_cap_off + PCI_EXP_LNKCTL2, 4,
+ &val);
+ if ((val & PCI_EXP_LNKCAP_SLS) != PCI_EXP_LNKCAP_SLS_2_5GB) {
+ val &= ~((u32)PCI_EXP_LNKCAP_SLS);
+ val |= PCI_EXP_LNKCAP_SLS_2_5GB;
+ dw_pcie_cfg_write(pp->dbi_base, exp_cap_off +
+ PCI_EXP_LNKCTL2, 4, val);
+ }
+ }
+
+ /* enable ltssm */
+ writel(DEVICE_TYPE_RC | (1 << MISCTRL_EN_ID)
+ | (1 << APP_LTSSM_ENABLE_ID)
+ | ((u32)1 << REG_TRANSLATION_ENABLE),
+ &app_reg->app_ctrl_0);
+
+ /* check if the link is up or not */
+ while (!dw_pcie_link_up(pp)) {
+ mdelay(100);
+ count++;
+ if (count == 10) {
+ dev_err(pp->dev, "link Fail\n");
+ return -EINVAL;
+ }
+ }
+ dev_info(pp->dev, "link up\n");
+
+ return 0;
+}
+
+static irqreturn_t spear13xx_pcie_irq_handler(int irq, void *arg)
+{
+ struct pcie_port *pp = arg;
+ struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pp);
+ struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
+ unsigned int status;
+
+ status = readl(&app_reg->int_sts);
+
+ if (status & MSI_CTRL_INT) {
+ if (!IS_ENABLED(CONFIG_PCI_MSI))
+ BUG();
+ dw_handle_msi_irq(pp);
+ }
+
+ writel(status, &app_reg->int_clr);
+
+ return IRQ_HANDLED;
+}
+
+static void spear13xx_pcie_enable_interrupts(struct pcie_port *pp)
+{
+ struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pp);
+ struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
+
+ /* Enable MSI interrupt */
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ dw_pcie_msi_init(pp);
+ writel(readl(&app_reg->int_mask) |
+ MSI_CTRL_INT, &app_reg->int_mask);
+ }
+}
+
+static int spear13xx_pcie_link_up(struct pcie_port *pp)
+{
+ struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pp);
+ struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
+
+ if (readl(&app_reg->app_status_1) & XMLH_LINK_UP)
+ return 1;
+
+ return 0;
+}
+
+static void spear13xx_pcie_host_init(struct pcie_port *pp)
+{
+ spear13xx_pcie_establish_link(pp);
+ spear13xx_pcie_enable_interrupts(pp);
+}
+
+static struct pcie_host_ops spear13xx_pcie_host_ops = {
+ .link_up = spear13xx_pcie_link_up,
+ .host_init = spear13xx_pcie_host_init,
+};
+
+static int add_pcie_port(struct pcie_port *pp, struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ int ret;
+
+ pp->irq = platform_get_irq(pdev, 0);
+ if (!pp->irq) {
+ dev_err(dev, "failed to get irq\n");
+ return -ENODEV;
+ }
+ ret = devm_request_irq(dev, pp->irq, spear13xx_pcie_irq_handler,
+ IRQF_SHARED, "spear1340-pcie", pp);
+ if (ret) {
+ dev_err(dev, "failed to request irq %d\n", pp->irq);
+ return ret;
+ }
+
+ pp->root_bus_nr = -1;
+ pp->ops = &spear13xx_pcie_host_ops;
+
+ ret = dw_pcie_host_init(pp);
+ if (ret) {
+ dev_err(dev, "failed to initialize host\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int __init spear13xx_pcie_probe(struct platform_device *pdev)
+{
+ struct spear13xx_pcie *spear13xx_pcie;
+ struct pcie_port *pp;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = pdev->dev.of_node;
+ struct resource *dbi_base;
+ int ret;
+
+ spear13xx_pcie = devm_kzalloc(dev, sizeof(*spear13xx_pcie), GFP_KERNEL);
+ if (!spear13xx_pcie) {
+ dev_err(dev, "no memory for SPEAr13xx pcie\n");
+ return -ENOMEM;
+ }
+
+ spear13xx_pcie->phy = devm_phy_get(dev, "pcie-phy");
+ if (IS_ERR(spear13xx_pcie->phy)) {
+ ret = PTR_ERR(spear13xx_pcie->phy);
+ if (ret == -EPROBE_DEFER)
+ dev_info(dev, "probe deferred\n");
+ else
+ dev_err(dev, "couldn't get pcie-phy\n");
+ return ret;
+ }
+
+ phy_init(spear13xx_pcie->phy);
+
+ spear13xx_pcie->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(spear13xx_pcie->clk)) {
+ dev_err(dev, "couldn't get clk for pcie\n");
+ return PTR_ERR(spear13xx_pcie->clk);
+ }
+ ret = clk_prepare_enable(spear13xx_pcie->clk);
+ if (ret) {
+ dev_err(dev, "couldn't enable clk for pcie\n");
+ return ret;
+ }
+
+ pp = &spear13xx_pcie->pp;
+
+ pp->dev = dev;
+
+ dbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ pp->dbi_base = devm_ioremap_resource(dev, dbi_base);
+ if (IS_ERR(pp->dbi_base)) {
+ dev_err(dev, "couldn't remap dbi base %p\n", dbi_base);
+ ret = PTR_ERR(pp->dbi_base);
+ goto fail_clk;
+ }
+ spear13xx_pcie->app_base = pp->dbi_base + 0x2000;
+
+ if (of_property_read_bool(np, "st,pcie-is-gen1"))
+ spear13xx_pcie->is_gen1 = true;
+
+ ret = add_pcie_port(pp, pdev);
+ if (ret < 0)
+ goto fail_clk;
+
+ platform_set_drvdata(pdev, spear13xx_pcie);
+ return 0;
+
+fail_clk:
+ clk_disable_unprepare(spear13xx_pcie->clk);
+
+ return ret;
+}
+
+static const struct of_device_id spear13xx_pcie_of_match[] = {
+ { .compatible = "st,spear1340-pcie", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, spear13xx_pcie_of_match);
+
+static struct platform_driver spear13xx_pcie_driver __initdata = {
+ .probe = spear13xx_pcie_probe,
+ .driver = {
+ .name = "spear-pcie",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(spear13xx_pcie_of_match),
+ },
+};
+
+/* SPEAr13xx PCIe driver does not allow module unload */
+
+static int __init pcie_init(void)
+{
+ return platform_driver_register(&spear13xx_pcie_driver);
+}
+module_init(pcie_init);
+
+MODULE_DESCRIPTION("ST Microelectronics SPEAr13xx PCIe host controller driver");
+MODULE_AUTHOR("Pratyush Anand <pratyush.anand@st.com>");
+MODULE_LICENSE("GPL v2");