![Dave Gerlach](/assets/img/avatar_default.png)
Certain SoCs like Texas Instruments AM335x and AM437x require parts of the EMIF PM code to run late in the suspend sequence from SRAM, such as saving and restoring the EMIF context and placing the memory into self-refresh. One requirement for these SoCs to suspend and enter its lowest power mode, called DeepSleep0, is that the PER power domain must be shut off. Because the EMIF (DDR Controller) resides within this power domain, it will lose context during a suspend operation, so we must save it so we can restore once we resume. However, we cannot execute this code from external memory, as it is not available at this point, so the code must be executed late in the suspend path from SRAM. This patch introduces a ti-emif-sram driver that includes several functions written in ARM ASM that are relocatable so the PM SRAM code can use them. It also allocates a region of writable SRAM to be used by the code running in the executable region of SRAM to save and restore the EMIF context. It can export a table containing the absolute addresses of the available PM functions so that other SRAM code can branch to them. This code is required for suspend/resume on AM335x and AM437x to work. In addition to this, to be able to share data structures between C and the ti-emif-sram-pm assembly code, we can automatically generate all of the C struct member offsets and sizes as macros by processing emif-asm-offsets.c into assembly code and then extracting the relevant data as is done for the generated platform asm-offsets.h files. Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
160 lines
5.3 KiB
Plaintext
160 lines
5.3 KiB
Plaintext
#
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# Memory devices
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#
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menuconfig MEMORY
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bool "Memory Controller drivers"
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if MEMORY
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config ARM_PL172_MPMC
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tristate "ARM PL172 MPMC driver"
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depends on ARM_AMBA && OF
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help
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This selects the ARM PrimeCell PL172 MultiPort Memory Controller.
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If you have an embedded system with an AMBA bus and a PL172
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controller, say Y or M here.
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config ATMEL_SDRAMC
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bool "Atmel (Multi-port DDR-)SDRAM Controller"
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default y
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depends on ARCH_AT91 && OF
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help
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This driver is for Atmel SDRAM Controller or Atmel Multi-port
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DDR-SDRAM Controller available on Atmel AT91SAM9 and SAMA5 SoCs.
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Starting with the at91sam9g45, this controller supports SDR, DDR and
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LP-DDR memories.
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config ATMEL_EBI
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bool "Atmel EBI driver"
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default y
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depends on ARCH_AT91 && OF
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select MFD_SYSCON
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select MFD_ATMEL_SMC
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help
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Driver for Atmel EBI controller.
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Used to configure the EBI (external bus interface) when the device-
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tree is used. This bus supports NANDs, external ethernet controller,
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SRAMs, ATA devices, etc.
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config TI_AEMIF
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tristate "Texas Instruments AEMIF driver"
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depends on (ARCH_DAVINCI || ARCH_KEYSTONE) && OF
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help
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This driver is for the AEMIF module available in Texas Instruments
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SoCs. AEMIF stands for Asynchronous External Memory Interface and
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is intended to provide a glue-less interface to a variety of
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asynchronuous memory devices like ASRAM, NOR and NAND memory. A total
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of 256M bytes of any of these memories can be accessed at a given
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time via four chip selects with 64M byte access per chip select.
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config TI_EMIF
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tristate "Texas Instruments EMIF driver"
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depends on ARCH_OMAP2PLUS
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select DDR
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help
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This driver is for the EMIF module available in Texas Instruments
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SoCs. EMIF is an SDRAM controller that, based on its revision,
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supports one or more of DDR2, DDR3, and LPDDR2 SDRAM protocols.
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This driver takes care of only LPDDR2 memories presently. The
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functions of the driver includes re-configuring AC timing
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parameters and other settings during frequency, voltage and
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temperature changes
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config OMAP_GPMC
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bool
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select GPIOLIB
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help
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This driver is for the General Purpose Memory Controller (GPMC)
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present on Texas Instruments SoCs (e.g. OMAP2+). GPMC allows
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interfacing to a variety of asynchronous as well as synchronous
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memory drives like NOR, NAND, OneNAND, SRAM.
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config OMAP_GPMC_DEBUG
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bool "Enable GPMC debug output and skip reset of GPMC during init"
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depends on OMAP_GPMC
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help
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Enables verbose debugging mostly to decode the bootloader provided
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timings. To preserve the bootloader provided timings, the reset
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of GPMC is skipped during init. Enable this during development to
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configure devices connected to the GPMC bus.
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NOTE: In addition to matching the register setup with the bootloader
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you also need to match the GPMC FCLK frequency used by the
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bootloader or else the GPMC timings won't be identical with the
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bootloader timings.
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config TI_EMIF_SRAM
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tristate "Texas Instruments EMIF SRAM driver"
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depends on (SOC_AM33XX || SOC_AM43XX) && SRAM
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help
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This driver is for the EMIF module available on Texas Instruments
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AM33XX and AM43XX SoCs and is required for PM. Certain parts of
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the EMIF PM code must run from on-chip SRAM late in the suspend
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sequence so this driver provides several relocatable PM functions
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for the SoC PM code to use.
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config MVEBU_DEVBUS
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bool "Marvell EBU Device Bus Controller"
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default y
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depends on PLAT_ORION && OF
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help
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This driver is for the Device Bus controller available in some
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Marvell EBU SoCs such as Discovery (mv78xx0), Orion (88f5xxx) and
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Armada 370 and Armada XP. This controller allows to handle flash
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devices such as NOR, NAND, SRAM, and FPGA.
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config TEGRA20_MC
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bool "Tegra20 Memory Controller(MC) driver"
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default y
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depends on ARCH_TEGRA_2x_SOC
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help
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This driver is for the Memory Controller(MC) module available
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in Tegra20 SoCs, mainly for a address translation fault
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analysis, especially for IOMMU/GART(Graphics Address
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Relocation Table) module.
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config FSL_CORENET_CF
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tristate "Freescale CoreNet Error Reporting"
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depends on FSL_SOC_BOOKE
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help
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Say Y for reporting of errors from the Freescale CoreNet
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Coherency Fabric. Errors reported include accesses to
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physical addresses that mapped by no local access window
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(LAW) or an invalid LAW, as well as bad cache state that
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represents a coherency violation.
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config FSL_IFC
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bool
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depends on FSL_SOC || ARCH_LAYERSCAPE || SOC_LS1021A
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config JZ4780_NEMC
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bool "Ingenic JZ4780 SoC NEMC driver"
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default y
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depends on MACH_JZ4780
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help
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This driver is for the NAND/External Memory Controller (NEMC) in
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the Ingenic JZ4780. This controller is used to handle external
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memory devices such as NAND and SRAM.
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config MTK_SMI
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bool
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depends on ARCH_MEDIATEK || COMPILE_TEST
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help
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This driver is for the Memory Controller module in MediaTek SoCs,
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mainly help enable/disable iommu and control the power domain and
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clocks for each local arbiter.
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config DA8XX_DDRCTL
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bool "Texas Instruments da8xx DDR2/mDDR driver"
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depends on ARCH_DAVINCI_DA8XX
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help
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This driver is for the DDR2/mDDR Memory Controller present on
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Texas Instruments da8xx SoCs. It's used to tweak various memory
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controller configuration options.
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source "drivers/memory/samsung/Kconfig"
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source "drivers/memory/tegra/Kconfig"
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endif
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