(2014/10/02 1:31), [email protected] 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.
> +
> + pr_debug("SOCFPGA: Success Initializing OCRAM\n");
> +}
> +
Thank you,
--
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: [email protected]
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