[PATCH 09/19] AM35xx: Add clock support for new modules on AM35xx

Paul Walmsley
2010-02-16T01:26:59Z

From: Ranjith Lohithakshan <ranjithl@ti.com>

This patch adds clock support for the following AM35xx modules
- Ethernet MAC
- CAN Controller (HECC)
- New MUSB OTG Controller with integrated Phy
- Video Processing Front End (VPFE)
- Additional UART (UART4)

Signed-off-by: Ranjith Lohithakshan <ranjithl@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
---
arch/arm/mach-omap2/clock34xx.c | 93 ++++++++++++++++++++++++++
arch/arm/mach-omap2/clock34xx.h | 4 +
arch/arm/mach-omap2/clock34xx_data.c | 118 +++++++++++++++++++++++++++++++++
arch/arm/mach-omap2/cm-regbits-34xx.h | 10 +++
4 files changed, 225 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c
index d339d2b..6180a03 100644
--- a/arch/arm/mach-omap2/clock34xx.c
+++ b/arch/arm/mach-omap2/clock34xx.c
@@ -39,6 +39,16 @@
*/
#define DPLL5_FREQ_FOR_USBHOST 120000000

+/*
+ * In AM35xx IPSS, the {ICK,FCK} enable bits for modules are exported
+ * in the same register at a bit offset of 0x8. The EN_ACK for ICK is
+ * at an offset of 4 from ICK enable bit.
+ */
+#define AM35XX_IPSS_ICK_MASK 0xF
+#define AM35XX_IPSS_ICK_EN_ACK_OFFSET 0x4
+#define AM35XX_IPSS_ICK_FCK_OFFSET 0x8
+#define AM35XX_IPSS_CLK_IDLEST_VAL 0
+
/* needed by omap3_core_dpll_m2_set_rate() */
struct clk *sdrc_ick_p, *arm_fck_p;

@@ -144,6 +154,89 @@ const struct clkops clkops_noncore_dpll_ops = {
.disable = omap3_noncore_dpll_disable,
};

+/**
+ * am35xx_clk_find_idlest - return clock ACK info for AM35XX IPSS
+ * @clk: struct clk * being enabled
+ * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
+ * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
+ * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
+ *
+ * The interface clocks on AM35xx IPSS reflects the clock idle status
+ * in the enable register itsel at a bit offset of 4 from the enable
+ * bit. A value of 1 indicates that clock is enabled.
+ */
+static void am35xx_clk_find_idlest(struct clk *clk,
+ void __iomem **idlest_reg,
+ u8 *idlest_bit,
+ u8 *idlest_val)
+{
+ *idlest_reg = (__force void __iomem *)(clk->enable_reg);
+ *idlest_bit = clk->enable_bit + AM35XX_IPSS_ICK_EN_ACK_OFFSET;
+ *idlest_val = AM35XX_IPSS_CLK_IDLEST_VAL;
+}
+
+/**
+ * am35xx_clk_find_companion - find companion clock to @clk
+ * @clk: struct clk * to find the companion clock of
+ * @other_reg: void __iomem ** to return the companion clock CM_*CLKEN va in
+ * @other_bit: u8 ** to return the companion clock bit shift in
+ *
+ * Some clocks don't have companion clocks. For example, modules with
+ * only an interface clock (such as HECC) don't have a companion
+ * clock. Right now, this code relies on the hardware exporting a bit
+ * in the correct companion register that indicates that the
+ * nonexistent 'companion clock' is active. Future patches will
+ * associate this type of code with per-module data structures to
+ * avoid this issue, and remove the casts. No return value.
+ */
+static void am35xx_clk_find_companion(struct clk *clk, void __iomem **other_reg,
+ u8 *other_bit)
+{
+ *other_reg = (__force void __iomem *)(clk->enable_reg);
+ if (clk->enable_bit & AM35XX_IPSS_ICK_MASK)
+ *other_bit = clk->enable_bit + AM35XX_IPSS_ICK_FCK_OFFSET;
+ else
+ *other_bit = clk->enable_bit - AM35XX_IPSS_ICK_FCK_OFFSET;
+}
+
+const struct clkops clkops_am35xx_ipss_module_wait = {
+ .enable = omap2_dflt_clk_enable,
+ .disable = omap2_dflt_clk_disable,
+ .find_idlest = am35xx_clk_find_idlest,
+ .find_companion = am35xx_clk_find_companion,
+};
+
+/**
+ * am35xx_clk_ipss_find_idlest - return CM_IDLEST info for IPSS
+ * @clk: struct clk * being enabled
+ * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
+ * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
+ * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
+ *
+ * The IPSS target CM_IDLEST bit is at a different shift from the
+ * CM_{I,F}CLKEN bit. Pass back the correct info via @idlest_reg
+ * and @idlest_bit. No return value.
+ */
+static void am35xx_clk_ipss_find_idlest(struct clk *clk,
+ void __iomem **idlest_reg,
+ u8 *idlest_bit,
+ u8 *idlest_val)
+{
+ u32 r;
+
+ r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
+ *idlest_reg = (__force void __iomem *)r;
+ *idlest_bit = AM35XX_ST_IPSS_SHIFT;
+ *idlest_val = OMAP34XX_CM_IDLEST_VAL;
+}
+
+const struct clkops clkops_am35xx_ipss_wait = {
+ .enable = omap2_dflt_clk_enable,
+ .disable = omap2_dflt_clk_disable,
+ .find_idlest = am35xx_clk_ipss_find_idlest,
+ .find_companion = omap2_clk_dflt_find_companion,
+};
+
int omap3_dpll4_set_rate(struct clk *clk, unsigned long rate)
{
/*
diff --git a/arch/arm/mach-omap2/clock34xx.h b/arch/arm/mach-omap2/clock34xx.h
index 73f2109..e61e653 100644
--- a/arch/arm/mach-omap2/clock34xx.h
+++ b/arch/arm/mach-omap2/clock34xx.h
@@ -22,4 +22,8 @@ extern const struct clkops clkops_omap3430es2_hsotgusb_wait;
extern const struct clkops clkops_omap3430es2_dss_usbhost_wait;
extern const struct clkops clkops_noncore_dpll_ops;

+/* AM35xx-specific clkops */
+extern const struct clkops clkops_am35xx_ipss_module_wait;
+extern const struct clkops clkops_am35xx_ipss_wait;
+
#endif
diff --git a/arch/arm/mach-omap2/clock34xx_data.c b/arch/arm/mach-omap2/clock34xx_data.c
index 0d04f92..d9d5b2e 100644
--- a/arch/arm/mach-omap2/clock34xx_data.c
+++ b/arch/arm/mach-omap2/clock34xx_data.c
@@ -2983,6 +2983,113 @@ static struct clk wdt1_fck = {
.recalc = &followparent_recalc,
};

+/* Clocks for AM35XX */
+static struct clk ipss_ick = {
+ .name = "ipss_ick",
+ .ops = &clkops_am35xx_ipss_wait,
+ .parent = &core_l3_ick,
+ .clkdm_name = "core_l3_clkdm",
+ .enable_reg = OMAP_CM_REGADDR(CORE_MOD, CM_ICLKEN1),
+ .enable_bit = AM35XX_EN_IPSS_SHIFT,
+ .recalc = &followparent_recalc,
+};
+
+static struct clk emac_ick = {
+ .name = "emac_ick",
+ .ops = &clkops_am35xx_ipss_module_wait,
+ .parent = &ipss_ick,
+ .clkdm_name = "core_l3_clkdm",
+ .enable_reg = OMAP343X_CTRL_REGADDR(AM35XX_CONTROL_IPSS_CLK_CTRL),
+ .enable_bit = AM35XX_CPGMAC_VBUSP_CLK_SHIFT,
+ .recalc = &followparent_recalc,
+};
+
+static struct clk rmii_ck = {
+ .name = "rmii_ck",
+ .ops = &clkops_null,
+ .flags = RATE_FIXED,
+ .rate = 50000000,
+};
+
+static struct clk emac_fck = {
+ .name = "emac_fck",
+ .ops = &clkops_omap2_dflt,
+ .parent = &rmii_ck,
+ .enable_reg = OMAP343X_CTRL_REGADDR(AM35XX_CONTROL_IPSS_CLK_CTRL),
+ .enable_bit = AM35XX_CPGMAC_FCLK_SHIFT,
+ .recalc = &followparent_recalc,
+};
+
+static struct clk hsotgusb_ick_am35xx = {
+ .name = "hsotgusb_ick",
+ .ops = &clkops_am35xx_ipss_module_wait,
+ .parent = &ipss_ick,
+ .clkdm_name = "core_l3_clkdm",
+ .enable_reg = OMAP343X_CTRL_REGADDR(AM35XX_CONTROL_IPSS_CLK_CTRL),
+ .enable_bit = AM35XX_USBOTG_VBUSP_CLK_SHIFT,
+ .recalc = &followparent_recalc,
+};
+
+static struct clk hsotgusb_fck_am35xx = {
+ .name = "hsotgusb_fck",
+ .ops = &clkops_omap2_dflt,
+ .parent = &sys_ck,
+ .clkdm_name = "core_l3_clkdm",
+ .enable_reg = OMAP343X_CTRL_REGADDR(AM35XX_CONTROL_IPSS_CLK_CTRL),
+ .enable_bit = AM35XX_USBOTG_FCLK_SHIFT,
+ .recalc = &followparent_recalc,
+};
+
+static struct clk hecc_ck = {
+ .name = "hecc_ck",
+ .ops = &clkops_am35xx_ipss_module_wait,
+ .parent = &sys_ck,
+ .clkdm_name = "core_l3_clkdm",
+ .enable_reg = OMAP343X_CTRL_REGADDR(AM35XX_CONTROL_IPSS_CLK_CTRL),
+ .enable_bit = AM35XX_HECC_VBUSP_CLK_SHIFT,
+ .recalc = &followparent_recalc,
+};
+
+static struct clk vpfe_ick = {
+ .name = "vpfe_ick",
+ .ops = &clkops_am35xx_ipss_module_wait,
+ .parent = &ipss_ick,
+ .clkdm_name = "core_l3_clkdm",
+ .enable_reg = OMAP343X_CTRL_REGADDR(AM35XX_CONTROL_IPSS_CLK_CTRL),
+ .enable_bit = AM35XX_VPFE_VBUSP_CLK_SHIFT,
+ .recalc = &followparent_recalc,
+};
+
+static struct clk pclk_ck = {
+ .name = "pclk_ck",
+ .ops = &clkops_null,
+ .flags = RATE_FIXED,
+ .rate = 27000000,
+};
+
+static struct clk vpfe_fck = {
+ .name = "vpfe_fck",
+ .ops = &clkops_omap2_dflt,
+ .parent = &pclk_ck,
+ .enable_reg = OMAP343X_CTRL_REGADDR(AM35XX_CONTROL_IPSS_CLK_CTRL),
+ .enable_bit = AM35XX_VPFE_FCLK_SHIFT,
+ .recalc = &followparent_recalc,
+};
+
+/*
+ * The UART1/2 functional clock acts as the functional
+ * clock for UART4. No separate fclk control available.
+ */
+static struct clk uart4_ick_am35xx = {
+ .name = "uart4_ick",
+ .ops = &clkops_omap2_dflt_wait,
+ .parent = &core_l4_ick,
+ .enable_reg = OMAP_CM_REGADDR(CORE_MOD, CM_ICLKEN1),
+ .enable_bit = AM35XX_EN_UART4_SHIFT,
+ .clkdm_name = "core_l4_clkdm",
+ .recalc = &followparent_recalc,
+};
+

/*
* clkdev
@@ -3209,6 +3316,17 @@ static struct omap_clk omap3xxx_clks[] = {
CLK(NULL, "secure_32k_fck", &secure_32k_fck, CK_3XXX),
CLK(NULL, "gpt12_fck", &gpt12_fck, CK_3XXX),
CLK(NULL, "wdt1_fck", &wdt1_fck, CK_3XXX),
+ CLK(NULL, "ipss_ick", &ipss_ick, CK_AM35XX),
+ CLK(NULL, "rmii_ck", &rmii_ck, CK_AM35XX),
+ CLK(NULL, "pclk_ck", &pclk_ck, CK_AM35XX),
+ CLK("davinci_emac", "ick", &emac_ick, CK_AM35XX),
+ CLK("davinci_emac", "fck", &emac_fck, CK_AM35XX),
+ CLK("vpfe-capture", "master", &vpfe_ick, CK_AM35XX),
+ CLK("vpfe-capture", "slave", &vpfe_fck, CK_AM35XX),
+ CLK("musb_hdrc", "ick", &hsotgusb_ick_am35xx, CK_AM35XX),
+ CLK("musb_hdrc", "fck", &hsotgusb_fck_am35xx, CK_AM35XX),
+ CLK(NULL, "hecc_ck", &hecc_ck, CK_AM35XX),
+ CLK(NULL, "uart4_ick", &uart4_ick_am35xx, CK_AM35XX),
};

diff --git a/arch/arm/mach-omap2/cm-regbits-34xx.h b/arch/arm/mach-omap2/cm-regbits-34xx.h
index d18da47..c04c7c6 100644
--- a/arch/arm/mach-omap2/cm-regbits-34xx.h
+++ b/arch/arm/mach-omap2/cm-regbits-34xx.h
@@ -168,6 +168,12 @@
#define OMAP3430_EN_SDRC (1 << 1)
#define OMAP3430_EN_SDRC_SHIFT 1

+/* AM35XX specific CM_ICLKEN1_CORE bits */
+#define AM35XX_EN_IPSS_MASK (1 << 4)
+#define AM35XX_EN_IPSS_SHIFT 4
+#define AM35XX_EN_UART4_MASK (1 << 23)
+#define AM35XX_EN_UART4_SHIFT 23
+
/* CM_ICLKEN2_CORE */
#define OMAP3430_EN_PKA (1 << 4)
#define OMAP3430_EN_PKA_SHIFT 4
@@ -220,6 +226,10 @@
#define OMAP3430_ST_SSI_STDBY_SHIFT 0
#define OMAP3430_ST_SSI_STDBY_MASK (1 << 0)

+/* AM35xx specific CM_IDLEST1_CORE bits */
+#define AM35XX_ST_IPSS_SHIFT 5
+#define AM35XX_ST_IPSS_MASK (1 << 5)
+
/* CM_IDLEST2_CORE */
#define OMAP3430_ST_PKA_SHIFT 4
#define OMAP3430_ST_PKA_MASK (1 << 4)