From: Suman Anna <s-a...@ti.com>
This patch adds support to update the device-tree blob to adjust the
DSP and IVA DPLL clocks pertinent to the selected OPP choice, with
the default being OPP_NOM. The voltage settings are done in u-boot,
but the actual clock configuration itself is done in kernel because
of the following reasons:
1. SoC definition constraints us to NOT to do dynamic voltage
scaling ever after the initial avs0 setting in bootloader
- so the voltage must be set in bootloader.
2. The voltage level must be set even if the IP blocks like
GPU/DSP are unused.
3. The IVA, GPU and DSP DPLLs are not essential for u-boot functionality,
and similar DPLL clock configuration code has been cleaned up in
v2014.10 u-boot release. See commit, 02c41535b6a4 ("ARM: OMAP4/5:
Remove dead code against CONFIG_SYS_CLOCKS_ENABLE_ALL").
The non-essential DPLLs are configured within the kernel during
the clock init step when parsing the device tree and creating
the clock devices. This approach meets both the u-boot and kernel
needs.
Signed-off-by: Suman Anna <s-a...@ti.com>
Signed-off-by: Subhajit Paul <subhajit_p...@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvu...@ti.com>
---
arch/arm/mach-omap2/omap5/fdt.c | 136 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 136 insertions(+)
diff --git a/arch/arm/mach-omap2/omap5/fdt.c b/arch/arm/mach-omap2/omap5/fdt.c
index da8d59b..1cc516c 100644
--- a/arch/arm/mach-omap2/omap5/fdt.c
+++ b/arch/arm/mach-omap2/omap5/fdt.c
@@ -233,6 +233,141 @@ static void ft_hs_fixups(void *fdt, bd_t *bd)
}
#endif /* #ifdef CONFIG_TI_SECURE_DEVICE */
+#if defined(CONFIG_TARGET_DRA7XX_EVM) || defined(CONFIG_TARGET_AM57XX_EVM)
+#define OPP_DSP_CLK_NUM 3
+#define OPP_IVA_CLK_NUM 2
+#define OPP_GPU_CLK_NUM 2
+
+const char *dra7_opp_dsp_clk_names[OPP_DSP_CLK_NUM] = {
+ "dpll_dsp_ck",
+ "dpll_dsp_m2_ck",
+ "dpll_dsp_m3x2_ck",
+};
+
+const char *dra7_opp_iva_clk_names[OPP_IVA_CLK_NUM] = {
+ "dpll_iva_ck",
+ "dpll_iva_m2_ck",
+};
+
+const char *dra7_opp_gpu_clk_names[OPP_GPU_CLK_NUM] = {
+ "dpll_gpu_ck",
+ "dpll_gpu_m2_ck",
+};
+
+/* DSPEVE voltage domain */
+u32 dra7_opp_dsp_clk_rates[NUM_OPPS][OPP_DSP_CLK_NUM] = {
+ {}, /*OPP_LOW */
+ {600000000, 600000000, 400000000}, /* OPP_NOM */
+ {700000000, 700000000, 466666667}, /* OPP_OD */
+ {750000000, 750000000, 500000000}, /* OPP_HIGH */
+};
+
+/* IVA voltage domain */
+u32 dra7_opp_iva_clk_rates[NUM_OPPS][OPP_IVA_CLK_NUM] = {
+ {}, /* OPP_LOW */
+ {1165000000, 388333334}, /* OPP_NOM */
+ {860000000, 430000000}, /* OPP_OD */
+ {1064000000, 532000000}, /* OPP_HIGH */
+};
+
+/* GPU voltage domain */
+u32 dra7_opp_gpu_clk_rates[NUM_OPPS][OPP_GPU_CLK_NUM] = {
+ {}, /* OPP_LOW */
+ {1277000000, 425666667}, /* OPP_NOM */
+ {1000000000, 500000000}, /* OPP_OD */
+ {1064000000, 532000000}, /* OPP_HIGH */
+};
+
+static int ft_fixup_clocks(void *fdt, const char **names, u32 *rates, int num)
+{
+ int offs, node_offs, ret, i;
+ uint32_t phandle;
+
+ offs = fdt_path_offset(fdt, "/ocp/l4@4a000000/cm_core_aon@5000/clocks");
+ if (offs < 0) {
+ debug("Could not find cm_core_aon clocks node path offset :
%s\n",
+ fdt_strerror(offs));
+ return offs;
+ }
+
+ for (i = 0; i < num; i++) {
+ node_offs = fdt_subnode_offset(fdt, offs, names[i]);
+ if (node_offs < 0) {
+ debug("Could not find clock sub-node %s: %s\n",
+ names[i], fdt_strerror(node_offs));
+ return offs;
+ }
+
+ phandle = fdt_get_phandle(fdt, node_offs);
+ if (!phandle) {
+ debug("Could not find phandle for clock %s\n",
+ names[i]);
+ return -1;
+ }
+
+ ret = fdt_setprop_u32(fdt, node_offs, "assigned-clocks",
+ phandle);
+ if (ret < 0) {
+ debug("Could not add assigned-clocks property to clock
node %s: %s\n",
+ names[i], fdt_strerror(ret));
+ return ret;
+ }
+
+ ret = fdt_setprop_u32(fdt, node_offs, "assigned-clock-rates",
+ rates[i]);
+ if (ret < 0) {
+ debug("Could not add assigned-clock-rates property to
clock node %s: %s\n",
+ names[i], fdt_strerror(ret));
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static void ft_opp_clock_fixups(void *fdt, bd_t *bd)
+{
+ const char **clk_names;
+ u32 *clk_rates;
+ int ret;
+
+ if (!is_dra72x() && !is_dra7xx())
+ return;
+
+ /* fixup DSP clocks */
+ clk_names = dra7_opp_dsp_clk_names;
+ clk_rates = dra7_opp_dsp_clk_rates[get_voltrail_opp(VOLT_EVE)];
+ ret = ft_fixup_clocks(fdt, clk_names, clk_rates, OPP_DSP_CLK_NUM);
+ if (ret) {
+ printf("ft_fixup_clocks failed for DSP voltage domain: %s\n",
+ fdt_strerror(ret));
+ return;
+ }
+
+ /* fixup IVA clocks */
+ clk_names = dra7_opp_iva_clk_names;
+ clk_rates = dra7_opp_iva_clk_rates[get_voltrail_opp(VOLT_IVA)];
+ ret = ft_fixup_clocks(fdt, clk_names, clk_rates, OPP_IVA_CLK_NUM);
+ if (ret) {
+ printf("ft_fixup_clocks failed for IVA voltage domain: %s\n",
+ fdt_strerror(ret));
+ return;
+ }
+
+ /* fixup GPU clocks */
+ clk_names = dra7_opp_gpu_clk_names;
+ clk_rates = dra7_opp_gpu_clk_rates[get_voltrail_opp(VOLT_GPU)];
+ ret = ft_fixup_clocks(fdt, clk_names, clk_rates, OPP_GPU_CLK_NUM);
+ if (ret) {
+ printf("ft_fixup_clocks failed for GPU voltage domain: %s\n",
+ fdt_strerror(ret));
+ return;
+ }
+}
+#else
+static void ft_opp_clock_fixups(void *fdt, bd_t *bd) { }
+#endif /* CONFIG_TARGET_DRA7XX_EVM || CONFIG_TARGET_AM57XX_EVM */
+
/*
* Place for general cpu/SoC FDT fixups. Board specific
* fixups should remain in the board files which is where
@@ -241,4 +376,5 @@ static void ft_hs_fixups(void *fdt, bd_t *bd)
void ft_cpu_setup(void *fdt, bd_t *bd)
{
ft_hs_fixups(fdt, bd);
+ ft_opp_clock_fixups(fdt, bd);
}
--
2.10.1
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