| Commit message (Collapse) | Author | Age |
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Fix the following build warnings in busfreq driver:
/home/ra5478/work/linux_3.10.x/arch/arm/mach-imx/busfreq-imx6.c: In function 'imx6_dt_find_ddr_sram':
/home/ra5478/work/linux_3.10.x/arch/arm/mach-imx/busfreq-imx6.c:736:29: warning: assignment makes integer from pointer
without a cast [enabled by default]
ddr_freq_change_iram_phys = (void *)ddr_iram_addr;
^
CC drivers/base/firmware_class.o
/home/ra5478/work/linux_3.10.x/arch/arm/mach-imx/busfreq_ddr3.c: In function 'init_mmdc_ddr3_settings_imx6sx':
/home/ra5478/work/linux_3.10.x/arch/arm/mach-imx/busfreq_ddr3.c:404:22: warning: assignment makes pointer from integer
without a cast [enabled by default]
iram_iomux_settings = ddr_freq_change_iram_base + ddr_code_size;
^
/home/ra5478/work/linux_3.10.x/arch/arm/mach-imx/busfreq_ddr3.c: In function 'init_mmdc_ddr3_settings_imx6q':
/home/ra5478/work/linux_3.10.x/arch/arm/mach-imx/busfreq_ddr3.c:539:22: warning: assignment makes pointer from integer
without a cast [enabled by default]
iram_iomux_settings = ddr_freq_change_iram_base + ddr_code_size;
^
CC arch/arm/mach-imx/busfreq_lpddr2.o
/home/ra5478/work/linux_3.10.x/arch/arm/mach-imx/busfreq_lpddr2.c: In function 'init_mmdc_lpddr2_settings':
/home/ra5478/work/linux_3.10.x/arch/arm/mach-imx/busfreq_lpddr2.c:96:2: warning: ISO C90 forbids mixed declarations and
code [-Wdeclaration-after-statement]
unsigned long ddr_code_size;
^
/home/ra5478/work/linux_3.10.x/arch/arm/mach-imx/busfreq_lpddr2.c:101:3: warning: passing argument 1 of 'memcpy' makes
pointer from integer without a cast [enabled by default]
mx6_change_lpddr2_freq = (void *)fncpy(
Signed-off-by: Ranjani Vaidyanathan <Ranjani.Vaidyanathan@freescale.com>
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This patch adds support for dynamically calculating the size of all
low power code (suspend, ddr freq change and low power idle). This allows
for easy code changes in the future.
This patch also moves the DDR frequency change code from lower 8K of the memory
allocated for IRAM page table to regular IRAM. With this the lower 8K of the
IRAM page table only contains suspend/resume and low power IDLE code. This
gives a little more flexibility to the cdoe size for suspend/resume and low
power IDLE.
Signed-off-by: Ranjani Vaidyanathan <Ranjani.Vaidyanathan@freescale.com>
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Add freq scaling for lpddr2 of i.MX6SX, support 3 setpoints:
high -> 400MHz
audio -> 100MHz
low -> 24MHz
Signed-off-by: Anson Huang <b20788@freescale.com>
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Allocate page tables in IRAM that will be used when ever DDR is put
into self-refresh. Add support for this to iMX6SX.
Some common files are also changed to accomodate the OCRAM_S address that
is used to store the IRAM page table in iMX6SX.
This patch depends on the following two commits:
ENGR297285-1 [MX6x] Support IRAM page table when DDR is in self-refresh.
ENGR297285-2 [MX6x] Support IRAM page table when DDR is in self-refresh.
Signed-off-by: Ranjani Vaidyanathan <Ranjani.Vaidyanathan@freescale.com>
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Whenever DDR is explicitly put into self-refresh, we need to ensure
that no access are made to the DDR. All the bus masters excpet ARM
are shutdown gracefully.
The ARM core can continue to access the DDR due to:
1. Speculative accesses
This can be prevented by flushing the Branch Target Address Cache
2. Aggressive Prefetching
This can be minimized by adding nops.
Apart from this the TLB architecture in ARM does not guarantee that
an entry remains in the TLB unless its explicitly locked. Even if
free slots are available an entry maybe evicted. So flushing the TLB
does not guarantee a page table walk will not happen.
The solution is to put a minimized page table in IRAM that can be used when
DDR is in self-refresh. The IRAM page tables should have entries for IRAM,
AIPS1 and AIPS2 as these entries will be needed by the code that puts DDR
into self-refresh. It should not contain any entries that point to the DDR.
This patch set accomplishes the following:
1. Set the IRAM to be mapped as 1M sections in the high mem region.
This makes it possible to create entries for the IRAM code in the IRAM page table.
We need to ensure that both the DDR and IRAM page table have mapping for the IRAM code.
2. Ensure the IRAM, AIPS1, AIPS2 have entries in the IRAM page table.
3. Save TTBR1
4. Set TTBR1 to point to the page tables stored in IRAM. Switch to using
TTBR1 before DDR is put into self-refresh. Ensure the following settings:
a. TTBCR.N = 1
This means the 0-2G virtual address space is translated using TTBR0
and 2G-4G is translated using TTBR1.
b. Set TTBCR.PD0 = 1
With this setting page table walks using TTBR0 are disabled.
4. After the DDR has exited self-refresh, reset TTBCR to 0 (TTBR0 will
be used for translations now).
5. Restore TTBR1
Even though TTBR1 is only used to decode the top 2G of virtual address
space, ARM requires that we allocate the entire 16KB for the page table.
To minimize IRAM/OCRAM required, we put the code in the bottom 8K and
page table entries in the top 8K.
This requires the low power code be optimized to occupy as little space
as possible.
This commit is cherry-picked:
93ae491d9dbe34a91e2dd5832b02b0f0a390ddbe
Signed-off-by: Ranjani Vaidyanathan <Ranjani.Vaidyanathan@freescale.com>
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During DDR frequency change code or in low power IDLE code (in iMX6SL),
we need to ensure that all register addresses accessed in the IRAM
code are in the TLB. There should be no TLB walks when DDR is in self-refresh.
To ensure this flush the TLB before DDR frequency change and before
low power IDLE (only iMX6SL) procedures.
Signed-off-by: Ranjani Vaidyanathan <ra5478@freescale.com>
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Added a new bus freq mode - ultra_low_bus_freq_mode.
In this mode the ARM is the only bus master that is active and
the system is already in low power idle mode.
And when ARM executes WFI in this mode, we do some aggressive
power savings techinques like:
1. Drop DDR freq to 1MHz
2. Drop AHB freq to 3MHz
3. Float the DDR IO pads
4. If all PLLs are in bypass (which should be the case), do
some analog power saving options like reducing the OSC-bias current,
turning off the regular bandgap, disabling the regular 2P5, enabling
the weak 2p5 etc.
Signed-off-by: Ranjani Vaidyanathan <ra5478@freescale.com>
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Add support to scale the DDR frequency between 400MHz and 24MHz.
Add support to scale AHB between 132MHz and 24MHz.
Signed-off-by: Ranjani Vaidyanathan <ra5478@freescale.com>
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