[PATCH 4/9] arm/tegra: fuse: add functions to access chip revision
STALE5385d
From: Stephen Warren <hidden>
Date: 2012-01-04 23:20:33
Also in:
linux-tegra
Revision v1 of 5 in this series.
Revisions (5)
Olof Johansson wrote at Thursday, December 22, 2011 5:18 PM:
Add function to get chip revision, and print it out at boot time. Restructure the fuse access to just use cached variables instead of always reading the fuses, and export those variables directly instead of using accessor functions. Add a SKU ID table of currently known values.
quoted hunk ↗ jump to hunk
+static enum tegra_revision tegra_get_revision(void) +{ + void __iomem *chip_id = IO_ADDRESS(TEGRA_APB_MISC_BASE) + 0x804; + u32 id = readl(chip_id); + + switch ((id >> 16) & 0xf) {
We probably should decode A01 too; I certainly had a Tegra30 A01 until recently, so it's entirely possible others do and want a meaningful result. Should the "A" should be decoded from the register too? It's bits 7:4 of the register and IIRC, 0=??? 1=A, presumably 2=B etc.
quoted hunk ↗ jump to hunk
+ case 2: + return TEGRA_REVISION_A02; + case 3: + if (get_spare_fuse(18) || get_spare_fuse(19)) + return TEGRA_REVISION_A03p;
Does that apply equally to Tegra30 as well as Tegra20? I'm afraid I don't know, but if you need I can try and find out.
quoted hunk ↗ jump to hunk
+ else + return TEGRA_REVISION_A03; + case 4: + return TEGRA_REVISION_A04;
And there's space in the register for numbers higher than 4, although I don't think there's any current silicon where this would matter.
quoted hunk ↗ jump to hunk
+ default: + return TEGRA_REVISION_UNKNOWN; + } +}
-- nvpublic