Re: [PATCH 1/3] arm: socfpga: Enable ECC of L2 and OCRAM on startup.

[Thor Thayer <tthayer-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org>]

On 10/04/2014 11:21 PM, Masami Hiramatsu wrote:
> (2014/10/02 1:31), tthayer-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org wrote:
>> +void socfpga_init_ocram_ecc(void)
>> +{
>> +	struct device_node *np;
>> +	const __be32 *prop;
>> +	u32 ocr_edac_addr, iram_addr, len;
>> +	void __iomem  *mapped_ocr_edac_addr;
>> +	size_t size;
>> +	struct gen_pool *gp;
>> +
>> +	np = of_find_compatible_node(NULL, NULL, "altr,ocram-edac");
>> +	if (!np) {
>> +		pr_err("SOCFPGA: Unable to find altr,ocram-edac in dtb\n");
>> +		return;
>> +	}
>> +
>> +	prop = of_get_property(np, "reg", &size);
>> +	ocr_edac_addr = be32_to_cpup(prop++);
>> +	len = be32_to_cpup(prop);
>> +	if (!prop || size < sizeof(*prop)) {
>> +		pr_err("SOCFPGA: Unable to find OCRAM ECC mapping in dtb\n");
>> +		return;
>> +	}
>> +
>> +	gp = of_get_named_gen_pool(np, "iram", 0);
>> +	if (!gp) {
>> +		pr_err("SOCFPGA: OCRAM cannot find gen pool\n");
>> +		return;
>> +	}
>> +
>> +	np = of_find_compatible_node(NULL, NULL, "mmio-sram");
>> +	if (!np) {
>> +		pr_err("SOCFPGA: Unable to find mmio-sram in dtb\n");
>> +		return;
>> +	}
>> +	/* Determine the OCRAM address and size */
>> +	prop = of_get_property(np, "reg", &size);
>> +	iram_addr = be32_to_cpup(prop++);
>> +	len = be32_to_cpup(prop);
>> +
>> +	if (!prop || size < sizeof(*prop)) {
>> +		pr_err("SOCFPGA: Unable to find OCRAM mapping in dtb\n");
>> +		return;
>> +	}
>> +
>> +	iram_addr = gen_pool_alloc(gp, len);
>> +	if (iram_addr == 0) {
>> +		pr_err("SOCFPGA: cannot alloc from gen pool\n");
>> +		return;
>> +	}
>> +
>> +	memset((void *)iram_addr, 0, len);
>> +
>> +	mapped_ocr_edac_addr = ioremap(ocr_edac_addr, 4);
>> +
>> +	gen_pool_free(gp, iram_addr, len);
>> +
>> +	/* Clear any pending OCRAM ECC interrupts, then enable ECC */
>> +	writel(0x18, mapped_ocr_edac_addr);
>> +	writel(0x19, mapped_ocr_edac_addr);
> Should we better iounmap() here?
> It seems no one can use mapped_ocr_edac_addr afterwords.
>

Yes, I will make this change. Thank you!

>> +
>> +	pr_debug("SOCFPGA: Success Initializing OCRAM\n");
>> +}
>> +
> Thank you,
>
>

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