From: David Brownell <[email protected]> Package on-chip SRAM. It's always accessible from the ARM, so set up a standardized virtual address mapping into a 128 KiB area that's reserved for platform use.
In some cases (dm6467) the physical addresses used for EDMA are not the same as the ones used by the ARM ... so record that info separately in the SOC data, for chips (unlike the OMAP-L137) where SRAM may be used with EDMA. Other blocks of SRAM, such as the ETB buffer or DSP L1/L2 RAM, may be unused/available on some system. They are ignored here. Signed-off-by: David Brownell <[email protected]> --- arch/arm/mach-davinci/dm355.c | 9 +++++++++ arch/arm/mach-davinci/dm644x.c | 9 +++++++++ arch/arm/mach-davinci/dm646x.c | 9 +++++++++ arch/arm/mach-davinci/include/mach/common.h | 6 ++++++ 4 files changed, 33 insertions(+) --- a/arch/arm/mach-davinci/dm355.c +++ b/arch/arm/mach-davinci/dm355.c @@ -611,6 +611,13 @@ static struct map_desc dm355_io_desc[] = .length = IO_SIZE, .type = MT_DEVICE }, + { + .virtual = SRAM_VIRT, + .pfn = __phys_to_pfn(0x00010000), + .length = SZ_32K, + /* MT_MEMORY_NONCACHED requires supersection alignment */ + .type = MT_DEVICE, + }, }; /* Contents of JTAG ID register used to identify exact cpu type */ @@ -700,6 +707,8 @@ static struct davinci_soc_info davinci_s .gpio_num = 104, .gpio_irq = IRQ_DM355_GPIOBNK0, .serial_dev = &dm355_serial_device, + .sram_dma = 0x00010000, + .sram_len = SZ_32K, }; void __init dm355_init(void) --- a/arch/arm/mach-davinci/dm644x.c +++ b/arch/arm/mach-davinci/dm644x.c @@ -539,6 +539,13 @@ static struct map_desc dm644x_io_desc[] .length = IO_SIZE, .type = MT_DEVICE }, + { + .virtual = SRAM_VIRT, + .pfn = __phys_to_pfn(0x00008000), + .length = SZ_16K, + /* MT_MEMORY_NONCACHED requires supersection alignment */ + .type = MT_DEVICE, + }, }; /* Contents of JTAG ID register used to identify exact cpu type */ @@ -629,6 +636,8 @@ static struct davinci_soc_info davinci_s .gpio_irq = IRQ_GPIOBNK0, .serial_dev = &dm644x_serial_device, .emac_pdata = &dm644x_emac_pdata, + .sram_dma = 0x00008000, + .sram_len = SZ_16K, }; void __init dm644x_init(void) --- a/arch/arm/mach-davinci/dm646x.c +++ b/arch/arm/mach-davinci/dm646x.c @@ -518,6 +518,13 @@ static struct map_desc dm646x_io_desc[] .length = IO_SIZE, .type = MT_DEVICE }, + { + .virtual = SRAM_VIRT, + .pfn = __phys_to_pfn(0x00010000), + .length = SZ_32K, + /* MT_MEMORY_NONCACHED requires supersection alignment */ + .type = MT_DEVICE, + }, }; /* Contents of JTAG ID register used to identify exact cpu type */ @@ -608,6 +615,8 @@ static struct davinci_soc_info davinci_s .gpio_irq = IRQ_DM646X_GPIOBNK0, .serial_dev = &dm646x_serial_device, .emac_pdata = &dm646x_emac_pdata, + .sram_dma = 0x10010000, + .sram_len = SZ_32K, }; void __init dm646x_init(void) --- a/arch/arm/mach-davinci/include/mach/common.h +++ b/arch/arm/mach-davinci/include/mach/common.h @@ -66,9 +66,15 @@ struct davinci_soc_info { unsigned gpio_irq; struct platform_device *serial_dev; struct emac_platform_data *emac_pdata; + dma_addr_t sram_dma; + unsigned sram_len; }; extern struct davinci_soc_info *davinci_get_soc_info(void); extern void davinci_common_init(struct davinci_soc_info *soc_info); +/* standard place to map on-chip SRAMs; they *may* support DMA */ +#define SRAM_VIRT 0xfffe0000 +#define SRAM_SIZE SZ_128K + #endif /* __ARCH_ARM_MACH_DAVINCI_COMMON_H */ _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
