OMAP3 clock: add support for 192Mhz DPLL4M2 output
In 3630, DPLL4M2 output can be 96MHz or 192MHz (for SGX to run at
192). This patch has changes to support this feature. 96MHz clock is
generated by dividing 192Mhz clock by 2 using CM_CLKSEL_CORE register.
SGX can select Core Clock, 192MHz clock or CM_96M_FCLK as it's
functional clock. In summary changes done are:
1. Added a feature called omap3_has_192mhz_clk and enabled for 3630
2. Added a new clock node called omap_192m_alwon_ck
3. Made omap_96m_alwon_fck to derive its clock from omap_192m_alwon_ck
Signed-off-by: Vishwanath BS <Vishwanath.bs@ti.com>
[paul@pwsan.com: fixed whitespace]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
diff --git a/arch/arm/mach-omap2/clock34xx_data.c b/arch/arm/mach-omap2/clock34xx_data.c
index 4dd5926..da71ef1 100644
--- a/arch/arm/mach-omap2/clock34xx_data.c
+++ b/arch/arm/mach-omap2/clock34xx_data.c
@@ -692,18 +692,24 @@
* 96M_ALWON_FCLK (called "omap_96m_alwon_fck" below) and
* CM_96K_(F)CLK.
*/
-static struct clk omap_96m_alwon_fck = {
- .name = "omap_96m_alwon_fck",
+
+/* Adding 192MHz Clock node needed by SGX */
+static struct clk omap_192m_alwon_fck = {
+ .name = "omap_192m_alwon_fck",
.ops = &clkops_null,
.parent = &dpll4_m2x2_ck,
.recalc = &followparent_recalc,
};
-static struct clk cm_96m_fck = {
- .name = "cm_96m_fck",
- .ops = &clkops_null,
- .parent = &omap_96m_alwon_fck,
- .recalc = &followparent_recalc,
+static const struct clksel_rate omap_96m_alwon_fck_rates[] = {
+ { .div = 1, .val = 1, .flags = RATE_IN_36XX },
+ { .div = 2, .val = 2, .flags = RATE_IN_36XX | DEFAULT_RATE },
+ { .div = 0 }
+};
+
+static const struct clksel omap_96m_alwon_fck_clksel[] = {
+ { .parent = &omap_192m_alwon_fck, .rates = omap_96m_alwon_fck_rates },
+ { .parent = NULL }
};
static const struct clksel_rate omap_96m_dpll_rates[] = {
@@ -716,6 +722,31 @@
{ .div = 0 }
};
+static struct clk omap_96m_alwon_fck = {
+ .name = "omap_96m_alwon_fck",
+ .ops = &clkops_null,
+ .parent = &dpll4_m2x2_ck,
+ .recalc = &followparent_recalc,
+};
+
+static struct clk omap_96m_alwon_fck_3630 = {
+ .name = "omap_96m_alwon_fck",
+ .parent = &omap_192m_alwon_fck,
+ .init = &omap2_init_clksel_parent,
+ .ops = &clkops_null,
+ .recalc = &omap2_clksel_recalc,
+ .clksel_reg = OMAP_CM_REGADDR(CORE_MOD, CM_CLKSEL),
+ .clksel_mask = OMAP3630_CLKSEL_96M_MASK,
+ .clksel = omap_96m_alwon_fck_clksel
+};
+
+static struct clk cm_96m_fck = {
+ .name = "cm_96m_fck",
+ .ops = &clkops_null,
+ .parent = &omap_96m_alwon_fck,
+ .recalc = &followparent_recalc,
+};
+
static const struct clksel omap_96m_fck_clksel[] = {
{ .parent = &cm_96m_fck, .rates = omap_96m_dpll_rates },
{ .parent = &sys_ck, .rates = omap_96m_sys_rates },
@@ -1304,12 +1335,24 @@
/* SGX power domain - 3430ES2 only */
static const struct clksel_rate sgx_core_rates[] = {
+ { .div = 2, .val = 5, .flags = RATE_IN_36XX },
{ .div = 3, .val = 0, .flags = RATE_IN_343X | DEFAULT_RATE },
{ .div = 4, .val = 1, .flags = RATE_IN_343X },
{ .div = 6, .val = 2, .flags = RATE_IN_343X },
{ .div = 0 },
};
+static const struct clksel_rate sgx_192m_rates[] = {
+ { .div = 1, .val = 4, .flags = RATE_IN_36XX | DEFAULT_RATE },
+ { .div = 0 },
+};
+
+static const struct clksel_rate sgx_corex2_rates[] = {
+ { .div = 3, .val = 6, .flags = RATE_IN_36XX | DEFAULT_RATE },
+ { .div = 5, .val = 7, .flags = RATE_IN_36XX },
+ { .div = 0 },
+};
+
static const struct clksel_rate sgx_96m_rates[] = {
{ .div = 1, .val = 3, .flags = RATE_IN_343X | DEFAULT_RATE },
{ .div = 0 },
@@ -1318,7 +1361,9 @@
static const struct clksel sgx_clksel[] = {
{ .parent = &core_ck, .rates = sgx_core_rates },
{ .parent = &cm_96m_fck, .rates = sgx_96m_rates },
- { .parent = NULL },
+ { .parent = &omap_192m_alwon_fck, .rates = sgx_192m_rates },
+ { .parent = &corex2_fck, .rates = sgx_corex2_rates },
+ { .parent = NULL }
};
static struct clk sgx_fck = {
@@ -1332,6 +1377,8 @@
.clksel = sgx_clksel,
.clkdm_name = "sgx_clkdm",
.recalc = &omap2_clksel_recalc,
+ .set_rate = &omap2_clksel_set_rate,
+ .round_rate = &omap2_clksel_round_rate
};
static struct clk sgx_ick = {
@@ -3262,6 +3309,7 @@
CLK("etb", "emu_core_alwon_ck", &emu_core_alwon_ck, CK_3XXX),
CLK(NULL, "dpll4_ck", &dpll4_ck, CK_3XXX),
CLK(NULL, "dpll4_x2_ck", &dpll4_x2_ck, CK_3XXX),
+ CLK(NULL, "omap_192m_alwon_fck", &omap_192m_alwon_fck, CK_36XX),
CLK(NULL, "omap_96m_alwon_fck", &omap_96m_alwon_fck, CK_3XXX),
CLK(NULL, "omap_96m_fck", &omap_96m_fck, CK_3XXX),
CLK(NULL, "cm_96m_fck", &cm_96m_fck, CK_3XXX),
@@ -3495,6 +3543,8 @@
cpu_clkflg |= CK_3430ES2;
}
}
+ if (omap3_has_192mhz_clk())
+ omap_96m_alwon_fck = omap_96m_alwon_fck_3630;
if (cpu_is_omap3630()) {
cpu_mask |= RATE_IN_36XX;
diff --git a/arch/arm/mach-omap2/cm-regbits-34xx.h b/arch/arm/mach-omap2/cm-regbits-34xx.h
index e6a724c..a3a3ca0 100644
--- a/arch/arm/mach-omap2/cm-regbits-34xx.h
+++ b/arch/arm/mach-omap2/cm-regbits-34xx.h
@@ -346,6 +346,8 @@
#define OMAP3430_CLKSEL_L4_MASK (0x3 << 2)
#define OMAP3430_CLKSEL_L3_SHIFT 0
#define OMAP3430_CLKSEL_L3_MASK (0x3 << 0)
+#define OMAP3630_CLKSEL_96M_SHIFT 12
+#define OMAP3630_CLKSEL_96M_MASK (0x3 << 12)
/* CM_CLKSTCTRL_CORE */
#define OMAP3430ES1_CLKTRCTRL_D2D_SHIFT 4
diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index 9e7c4ae..d2897a6 100644
--- a/arch/arm/mach-omap2/id.c
+++ b/arch/arm/mach-omap2/id.c
@@ -175,6 +175,8 @@
OMAP3_CHECK_FEATURE(status, SGX);
OMAP3_CHECK_FEATURE(status, NEON);
OMAP3_CHECK_FEATURE(status, ISP);
+ if (cpu_is_omap3630())
+ omap3_features |= OMAP3_HAS_192MHZ_CLK;
/*
* TODO: Get additional info (where applicable)
@@ -359,6 +361,7 @@
OMAP3_SHOW_FEATURE(sgx);
OMAP3_SHOW_FEATURE(neon);
OMAP3_SHOW_FEATURE(isp);
+ OMAP3_SHOW_FEATURE(192mhz_clk);
printk(")\n");
}
diff --git a/arch/arm/plat-omap/include/plat/cpu.h b/arch/arm/plat-omap/include/plat/cpu.h
index b80151c..ed8786c 100644
--- a/arch/arm/plat-omap/include/plat/cpu.h
+++ b/arch/arm/plat-omap/include/plat/cpu.h
@@ -439,6 +439,7 @@
#define OMAP3_HAS_SGX BIT(2)
#define OMAP3_HAS_NEON BIT(3)
#define OMAP3_HAS_ISP BIT(4)
+#define OMAP3_HAS_192MHZ_CLK BIT(5)
#define OMAP3_HAS_FEATURE(feat,flag) \
static inline unsigned int omap3_has_ ##feat(void) \
@@ -451,5 +452,6 @@
OMAP3_HAS_FEATURE(iva, IVA)
OMAP3_HAS_FEATURE(neon, NEON)
OMAP3_HAS_FEATURE(isp, ISP)
+OMAP3_HAS_FEATURE(192mhz_clk, 192MHZ_CLK)
#endif