Re: [PATCH v4 2/2] Defines DA850/AM18xx/OMAPL1-38 SOC resources usedby PRUSS UIO driver

From: Sergei Shtylyov
Date: Mon Feb 28 2011 - 05:29:00 EST


On 28-02-2011 7:46, TK, Pratheesh Gangadhar wrote:

This patch defines PRUSS, ECAP clocks, memory and IRQ resources
used by PRUSS UIO driver in DA850/AM18xx/OMAPL1-38 devices. UIO

It's OMAP-L138.

driver exports 64K I/O region of PRUSS, 128KB L3 RAM and 256KB
DDR buffer to user space. PRUSS has 8 host event interrupt lines
mapped to IRQ_DA8XX_EVTOUT0..7 of ARM9 INTC.These in conjunction
with shared memory can be used to implement IPC between ARM9 and

Signed-off-by: Pratheesh Gangadhar<pratheesh@xxxxxx>


diff --git a/arch/arm/mach-davinci/devices-da8xx.c b/arch/arm/mach-
index beda8a4..4ea3d1f 100644
--- a/arch/arm/mach-davinci/devices-da8xx.c
+++ b/arch/arm/mach-davinci/devices-da8xx.c
@@ -725,3 +725,76 @@ int __init da8xx_register_cpuidle(void)

return platform_device_register(&da8xx_cpuidle_device);
+static struct resource pruss_resources[] = {
+ [0] = {
+ .start = DA8XX_PRUSS_BASE,
+ .end = DA8XX_PRUSS_BASE + SZ_64K - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ [1] = {
+ .start = DA8XX_L3RAM_BASE,
+ .end = DA8XX_L3RAM_BASE + SZ_128K - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ [2] = {
+ .start = 0,
+ .end = SZ_256K - 1,

Huh? I don't see where it's filled...

The current use is only to indicate memory block size to the PRUSS UIO driver when we allocate DDR memory using dma_alloc_coherent.

Why not pass this size via the platform data? There shouldn't be "dummy" resources.

sram_alloc is changed to use L3_RAM (128KB) instead of ARM RAM (8KB) in Mistral patch set - I need to follow the same convention
> for L3 RAM as well if I need to align with that patch. Is there a better way to do this?

Didn't understand about L3 RAM.
Also, please wrap your text at 80 columns.

WBR, Sergei
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