diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-16 16:05:01 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-16 16:05:01 -0800 |
commit | cf9b0772f2e410645fece13b749bd56505b998b8 (patch) | |
tree | 8b171a2c49d1e9e41d4e43fb91602e664cde8551 /drivers/firmware/qcom_scm.c | |
parent | 527d1470744d338c912f94bc1f4dba08ffdff349 (diff) | |
parent | 339cd0ea082287ea8e2b7e7159a5a33665a2cbe3 (diff) |
Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC driver updates from Arnd Bergmann:
"This branch contains platform-related driver updates for ARM and
ARM64, these are the areas that bring the changes:
New drivers:
- driver support for Renesas R-Car V3M (R8A77970)
- power management support for Amlogic GX
- a new driver for the Tegra BPMP thermal sensor
- a new bus driver for Technologic Systems NBUS
Changes for subsystems that prefer to merge through arm-soc:
- the usual updates for reset controller drivers from Philipp Zabel,
with five added drivers for SoCs in the arc, meson, socfpa,
uniphier and mediatek families
- updates to the ARM SCPI and PSCI frameworks, from Sudeep Holla,
Heiner Kallweit and Lorenzo Pieralisi
Changes specific to some ARM-based SoC
- the Freescale/NXP DPAA QBMan drivers from PowerPC can now work on
ARM as well
- several changes for power management on Broadcom SoCs
- various improvements on Qualcomm, Broadcom, Amlogic, Atmel,
Mediatek
- minor Cleanups for Samsung, TI OMAP SoCs"
[ NOTE! This doesn't work without the previous ARM SoC device-tree pull,
because the R8A77970 driver is missing a header file that came from
that pull.
The fact that this got merged afterwards only fixes it at this point,
and bisection of that driver will fail if/when you walk into the
history of that driver. - Linus ]
* tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (96 commits)
soc: amlogic: meson-gx-pwrc-vpu: fix power-off when powered by bootloader
bus: add driver for the Technologic Systems NBUS
memory: omap-gpmc: Remove deprecated gpmc_update_nand_reg()
soc: qcom: remove unused label
soc: amlogic: gx pm domain: add PM and OF dependencies
drivers/firmware: psci_checker: Add missing destroy_timer_on_stack()
dt-bindings: power: add amlogic meson power domain bindings
soc: amlogic: add Meson GX VPU Domains driver
soc: qcom: Remote filesystem memory driver
dt-binding: soc: qcom: Add binding for rmtfs memory
of: reserved_mem: Accessor for acquiring reserved_mem
of/platform: Generalize /reserved-memory handling
soc: mediatek: pwrap: fix fatal compiler error
soc: mediatek: pwrap: fix compiler errors
arm64: mediatek: cleanup message for platform selection
soc: Allow test-building of MediaTek drivers
soc: mediatek: place Kconfig for all SoC drivers under menu
soc: mediatek: pwrap: add support for MT7622 SoC
soc: mediatek: pwrap: add common way for setup CS timing extenstion
soc: mediatek: pwrap: add MediaTek MT6380 as one slave of pwrap
..
Diffstat (limited to 'drivers/firmware/qcom_scm.c')
-rw-r--r-- | drivers/firmware/qcom_scm.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c index bb16510d75ba..9064e559a01f 100644 --- a/drivers/firmware/qcom_scm.c +++ b/drivers/firmware/qcom_scm.c @@ -19,15 +19,20 @@ #include <linux/cpumask.h> #include <linux/export.h> #include <linux/dma-mapping.h> +#include <linux/module.h> #include <linux/types.h> #include <linux/qcom_scm.h> #include <linux/of.h> +#include <linux/of_address.h> #include <linux/of_platform.h> #include <linux/clk.h> #include <linux/reset-controller.h> #include "qcom_scm.h" +static bool download_mode = IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT); +module_param(download_mode, bool, 0); + #define SCM_HAS_CORE_CLK BIT(0) #define SCM_HAS_IFACE_CLK BIT(1) #define SCM_HAS_BUS_CLK BIT(2) @@ -38,6 +43,8 @@ struct qcom_scm { struct clk *iface_clk; struct clk *bus_clk; struct reset_controller_dev reset; + + u64 dload_mode_addr; }; static struct qcom_scm *__scm; @@ -333,6 +340,66 @@ int qcom_scm_iommu_secure_ptbl_init(u64 addr, u32 size, u32 spare) } EXPORT_SYMBOL(qcom_scm_iommu_secure_ptbl_init); +int qcom_scm_io_readl(phys_addr_t addr, unsigned int *val) +{ + return __qcom_scm_io_readl(__scm->dev, addr, val); +} +EXPORT_SYMBOL(qcom_scm_io_readl); + +int qcom_scm_io_writel(phys_addr_t addr, unsigned int val) +{ + return __qcom_scm_io_writel(__scm->dev, addr, val); +} +EXPORT_SYMBOL(qcom_scm_io_writel); + +static void qcom_scm_set_download_mode(bool enable) +{ + bool avail; + int ret = 0; + + avail = __qcom_scm_is_call_available(__scm->dev, + QCOM_SCM_SVC_BOOT, + QCOM_SCM_SET_DLOAD_MODE); + if (avail) { + ret = __qcom_scm_set_dload_mode(__scm->dev, enable); + } else if (__scm->dload_mode_addr) { + ret = __qcom_scm_io_writel(__scm->dev, __scm->dload_mode_addr, + enable ? QCOM_SCM_SET_DLOAD_MODE : 0); + } else { + dev_err(__scm->dev, + "No available mechanism for setting download mode\n"); + } + + if (ret) + dev_err(__scm->dev, "failed to set download mode: %d\n", ret); +} + +static int qcom_scm_find_dload_address(struct device *dev, u64 *addr) +{ + struct device_node *tcsr; + struct device_node *np = dev->of_node; + struct resource res; + u32 offset; + int ret; + + tcsr = of_parse_phandle(np, "qcom,dload-mode", 0); + if (!tcsr) + return 0; + + ret = of_address_to_resource(tcsr, 0, &res); + of_node_put(tcsr); + if (ret) + return ret; + + ret = of_property_read_u32_index(np, "qcom,dload-mode", 1, &offset); + if (ret < 0) + return ret; + + *addr = res.start + offset; + + return 0; +} + /** * qcom_scm_is_available() - Checks if SCM is available */ @@ -358,6 +425,10 @@ static int qcom_scm_probe(struct platform_device *pdev) if (!scm) return -ENOMEM; + ret = qcom_scm_find_dload_address(&pdev->dev, &scm->dload_mode_addr); + if (ret < 0) + return ret; + clks = (unsigned long)of_device_get_match_data(&pdev->dev); if (clks & SCM_HAS_CORE_CLK) { scm->core_clk = devm_clk_get(&pdev->dev, "core"); @@ -406,9 +477,24 @@ static int qcom_scm_probe(struct platform_device *pdev) __qcom_scm_init(); + /* + * If requested enable "download mode", from this point on warmboot + * will cause the the boot stages to enter download mode, unless + * disabled below by a clean shutdown/reboot. + */ + if (download_mode) + qcom_scm_set_download_mode(true); + return 0; } +static void qcom_scm_shutdown(struct platform_device *pdev) +{ + /* Clean shutdown, disable download mode to allow normal restart */ + if (download_mode) + qcom_scm_set_download_mode(false); +} + static const struct of_device_id qcom_scm_dt_match[] = { { .compatible = "qcom,scm-apq8064", /* FIXME: This should have .data = (void *) SCM_HAS_CORE_CLK */ @@ -436,6 +522,7 @@ static struct platform_driver qcom_scm_driver = { .of_match_table = qcom_scm_dt_match, }, .probe = qcom_scm_probe, + .shutdown = qcom_scm_shutdown, }; static int __init qcom_scm_init(void) |