diff options
| author | Jay Agarwal <jagarwal@nvidia.com> | 2012-05-30 19:00:33 +0530 |
|---|---|---|
| committer | Rohan Somvanshi <rsomvanshi@nvidia.com> | 2012-06-01 05:08:37 -0700 |
| commit | ccbef621c084776cfc21be93901369a37d273393 (patch) | |
| tree | 19bbfb980e3269576cedf31724d7289aa6d85558 /arch | |
| parent | 12b2531d0adf256dea0206c472ba8ffef58b65ff (diff) | |
arm: tegra: pci: Support for dock hot plug
PCIE dock detection is done using GPIO for cardhu
e1291 board. Currently supporting only hotplug
disconnect when all pcie devices will be stopped
and will not work on hotplug connect later.
Bug 912743
Bug 955043
Bug 946385
Change-Id: Ibb2869c12e193be5e6e7e057e149e7699598a061
Signed-off-by: Jay Agarwal <jagarwal@nvidia.com>
Reviewed-on: http://git-master/r/87315
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Varun Wadekar <vwadekar@nvidia.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-tegra/pcie.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/pcie.c b/arch/arm/mach-tegra/pcie.c index 80a9a121f193..49aa39fdb8fd 100644 --- a/arch/arm/mach-tegra/pcie.c +++ b/arch/arm/mach-tegra/pcie.c @@ -36,6 +36,8 @@ #include <linux/slab.h> #include <linux/platform_device.h> #include <linux/regulator/consumer.h> +#include <linux/workqueue.h> +#include <linux/gpio.h> #include <asm/sizes.h> #include <asm/mach/pci.h> @@ -308,6 +310,7 @@ struct tegra_pcie_port { char mem_space_name[16]; char prefetch_space_name[20]; struct resource res[3]; + struct pci_bus* bus; }; struct tegra_pcie_info { @@ -319,6 +322,7 @@ struct tegra_pcie_info { struct resource res_mmio; int power_rails_enabled; int pcie_power_enabled; + struct work_struct hotplug_detect; struct regulator *regulator_hvdd; struct regulator *regulator_pexio; @@ -620,6 +624,31 @@ static struct hw_pci tegra_pcie_hw = { .map_irq = tegra_pcie_map_irq, }; +static void work_hotplug_handler(struct work_struct *work) +{ + struct tegra_pcie_info *pcie_driver = + container_of(work, struct tegra_pcie_info, hotplug_detect); + int val; + + if (pcie_driver->plat_data->gpio == -1) + return; + val = gpio_get_value(pcie_driver->plat_data->gpio); + if (val == 0) { + pr_info("Pcie Dock Connected but hotplug functionality not supported yet\n"); + } else { + struct pci_dev *dev = NULL; + + pr_info("Pcie Dock DisConnected\n"); + for_each_pci_dev(dev) + pci_stop_bus_device(dev); + } +} + +static irqreturn_t gpio_pcie_detect_isr(int irq, void *arg) +{ + schedule_work(&tegra_pcie.hotplug_detect); + return IRQ_HANDLED; +} static irqreturn_t tegra_pcie_isr(int irq, void *arg) { @@ -1169,6 +1198,8 @@ static int tegra_pcie_init(void) pcibios_min_mem = 0x03000000ul; pcibios_min_io = 0x10000000ul; #endif + + INIT_WORK(&tegra_pcie.hotplug_detect, work_hotplug_handler); err = tegra_pcie_get_resources(); if (err) return err; @@ -1184,11 +1215,36 @@ static int tegra_pcie_init(void) } tegra_pcie.pcie_power_enabled = 1; + if (tegra_pcie.plat_data->use_dock_detect) { + unsigned int irq; + + pr_info("acquiring dock_detect = %d\n", + tegra_pcie.plat_data->gpio); + gpio_request(tegra_pcie.plat_data->gpio, "pcie_dock_detect"); + gpio_direction_input(tegra_pcie.plat_data->gpio); + irq = gpio_to_irq(tegra_pcie.plat_data->gpio); + if (irq < 0) { + pr_err("Unable to get irq number for dock_detect\n"); + goto err_irq; + } + err = request_irq(irq, + gpio_pcie_detect_isr, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, + "pcie_dock_detect", + (void *)tegra_pcie.plat_data); + if (err < 0) { + pr_err("Unable to claim irq number for dock_detect\n"); + goto err_irq; + } + } + if (tegra_pcie.num_ports) pci_common_init(&tegra_pcie_hw); else err = tegra_pcie_power_off(); +err_irq: + return err; } |