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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>
This commit is contained in:
Vishwanath BS 2010-02-22 22:09:10 -07:00 committed by Paul Walmsley
parent 678bc9a2ea
commit 7356f0b26b
4 changed files with 65 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

66
arch/arm/mach-omap2/clock34xx_data.c
View File

@ -692,18 +692,24 @@ static struct clk dpll4_m2x2_ck = {
* 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 @@ static const struct clksel_rate omap_96m_sys_rates[] = {
{ .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 @@ static struct clk gfx_cg2_ck = {
/* 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_rate sgx_96m_rates[] = {
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 @@ static struct clk sgx_fck = {
.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 @@ static struct omap_clk omap3xxx_clks[] = {
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 @@ int __init omap3xxx_clk_init(void)
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;

2
arch/arm/mach-omap2/cm-regbits-34xx.h
View File

@ -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

3
arch/arm/mach-omap2/id.c
View File

@ -175,6 +175,8 @@ void __init omap3_check_features(void)
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 @@ void __init omap3_cpuinfo(void)
OMAP3_SHOW_FEATURE(sgx);
OMAP3_SHOW_FEATURE(neon);
OMAP3_SHOW_FEATURE(isp);
OMAP3_SHOW_FEATURE(192mhz_clk);
printk(")\n");
}

2
arch/arm/plat-omap/include/plat/cpu.h
View File

@ -439,6 +439,7 @@ extern u32 omap3_features;
#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(sgx, SGX)
OMAP3_HAS_FEATURE(iva, IVA)
OMAP3_HAS_FEATURE(neon, NEON)
OMAP3_HAS_FEATURE(isp, ISP)
OMAP3_HAS_FEATURE(192mhz_clk, 192MHZ_CLK)
#endif