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authorEddie James <eajames@linux.ibm.com>2020-04-08 15:36:16 -0500
committerStephen Boyd <sboyd@kernel.org>2020-05-27 01:36:22 -0700
commit2d491066ccd4286538450c227fc5094ceb04b494 (patch)
treebe3834809f531a8ae2c19f5eca3e00432f4fdf3a /drivers/clk
parent8f3d9f354286745c751374f5f1fcafee6b3f3136 (diff)
downloadlinux-2d491066ccd4286538450c227fc5094ceb04b494.tar.bz2
clk: ast2600: Fix AHB clock divider for A1
The latest specs for the AST2600 A1 chip include some different bit definitions for calculating the AHB clock divider. Implement these in order to get the correct AHB clock value in Linux. Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lkml.kernel.org/r/20200408203616.4031-1-eajames@linux.ibm.com Fixes: d3d04f6c330a ("clk: Add support for AST2600 SoC") Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk')
-rw-r--r--drivers/clk/clk-ast2600.c31
1 files changed, 25 insertions, 6 deletions
diff --git a/drivers/clk/clk-ast2600.c b/drivers/clk/clk-ast2600.c
index 392d01705b97..99afc949925f 100644
--- a/drivers/clk/clk-ast2600.c
+++ b/drivers/clk/clk-ast2600.c
@@ -642,14 +642,22 @@ static const u32 ast2600_a0_axi_ahb_div_table[] = {
2, 2, 3, 5,
};
-static const u32 ast2600_a1_axi_ahb_div_table[] = {
- 4, 6, 2, 4,
+static const u32 ast2600_a1_axi_ahb_div0_tbl[] = {
+ 3, 2, 3, 4,
+};
+
+static const u32 ast2600_a1_axi_ahb_div1_tbl[] = {
+ 3, 4, 6, 8,
+};
+
+static const u32 ast2600_a1_axi_ahb200_tbl[] = {
+ 3, 4, 3, 4, 2, 2, 2, 2,
};
static void __init aspeed_g6_cc(struct regmap *map)
{
struct clk_hw *hw;
- u32 val, div, chip_id, axi_div, ahb_div;
+ u32 val, div, divbits, chip_id, axi_div, ahb_div;
clk_hw_register_fixed_rate(NULL, "clkin", NULL, 0, 25000000);
@@ -679,11 +687,22 @@ static void __init aspeed_g6_cc(struct regmap *map)
else
axi_div = 2;
+ divbits = (val >> 11) & 0x3;
regmap_read(map, ASPEED_G6_SILICON_REV, &chip_id);
- if (chip_id & BIT(16))
- ahb_div = ast2600_a1_axi_ahb_div_table[(val >> 11) & 0x3];
- else
+ if (chip_id & BIT(16)) {
+ if (!divbits) {
+ ahb_div = ast2600_a1_axi_ahb200_tbl[(val >> 8) & 0x3];
+ if (val & BIT(16))
+ ahb_div *= 2;
+ } else {
+ if (val & BIT(16))
+ ahb_div = ast2600_a1_axi_ahb_div1_tbl[divbits];
+ else
+ ahb_div = ast2600_a1_axi_ahb_div0_tbl[divbits];
+ }
+ } else {
ahb_div = ast2600_a0_axi_ahb_div_table[(val >> 11) & 0x3];
+ }
hw = clk_hw_register_fixed_factor(NULL, "ahb", "hpll", 0, 1, axi_div * ahb_div);
aspeed_g6_clk_data->hws[ASPEED_CLK_AHB] = hw;