From 419cc97d3678f0fca5e60b3853dd9c1371f67805 Mon Sep 17 00:00:00 2001 From: Ranjith Lohithakshan Date: Wed, 24 Feb 2010 12:05:54 -0700 Subject: OMAP2/3 clock: Extend find_idlest() to pass back idle state value Current implementation defines clock idle state indicators based on the cpu information (cpu_is_omap24xx() or cpu_is_omap34xx()) in a system wide manner. This patch extends the find_idlest() function in clkops to pass back the idle state indicator for that clock, thus allowing idle state indicators to be defined on a per clock basis if required. This is specifically needed on AM35xx devices as the new IPSS clocks indicates the idle status (0 is idle, 1 is ready) in a way just opposite to how its handled in OMAP3 (0 is ready, 1 is idle). Signed-off-by: Ranjith Lohithakshan [paul@pwsan.com: updated to apply after commit 98c45457 et seq.] Signed-off-by: Paul Walmsley --- arch/arm/mach-omap2/clkt2xxx_apll.c | 2 +- arch/arm/mach-omap2/clock.c | 25 ++++++++++++++++++++----- arch/arm/mach-omap2/clock.h | 2 +- arch/arm/mach-omap2/clock2xxx.c | 5 ++++- arch/arm/mach-omap2/clock34xx.c | 15 ++++++++++++--- arch/arm/mach-omap2/cm.h | 3 +++ arch/arm/mach-omap2/prcm.c | 14 +++++--------- 7 files changed, 46 insertions(+), 20 deletions(-) (limited to 'arch/arm/mach-omap2') diff --git a/arch/arm/mach-omap2/clkt2xxx_apll.c b/arch/arm/mach-omap2/clkt2xxx_apll.c index fc32ff8e790..d5b8b2bb0e9 100644 --- a/arch/arm/mach-omap2/clkt2xxx_apll.c +++ b/arch/arm/mach-omap2/clkt2xxx_apll.c @@ -57,7 +57,7 @@ static int omap2_clk_apll_enable(struct clk *clk, u32 status_mask) cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN); omap2_cm_wait_idlest(OMAP_CM_REGADDR(PLL_MOD, CM_IDLEST), status_mask, - clk->name); + OMAP24XX_CM_IDLEST_VAL, clk->name); /* * REVISIT: Should we return an error code if omap2_wait_clock_ready() diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c index 999b91e023b..3bb3292ec46 100644 --- a/arch/arm/mach-omap2/clock.c +++ b/arch/arm/mach-omap2/clock.c @@ -57,7 +57,7 @@ u8 cpu_mask; static void _omap2_module_wait_ready(struct clk *clk) { void __iomem *companion_reg, *idlest_reg; - u8 other_bit, idlest_bit; + u8 other_bit, idlest_bit, idlest_val; /* Not all modules have multiple clocks that their IDLEST depends on */ if (clk->ops->find_companion) { @@ -66,9 +66,10 @@ static void _omap2_module_wait_ready(struct clk *clk) return; } - clk->ops->find_idlest(clk, &idlest_reg, &idlest_bit); + clk->ops->find_idlest(clk, &idlest_reg, &idlest_bit, &idlest_val); - omap2_cm_wait_idlest(idlest_reg, (1 << idlest_bit), clk->name); + omap2_cm_wait_idlest(idlest_reg, (1 << idlest_bit), idlest_val, + clk->name); } /* Enables clock without considering parent dependencies or use count @@ -175,7 +176,8 @@ void omap2_clk_dflt_find_companion(struct clk *clk, void __iomem **other_reg, * omap2_clk_dflt_find_idlest - find CM_IDLEST reg va, bit shift for @clk * @clk: struct clk * to find IDLEST info for * @idlest_reg: void __iomem ** to return the CM_IDLEST va in - * @idlest_bit: u8 ** to return the CM_IDLEST bit shift in + * @idlest_bit: u8 * to return the CM_IDLEST bit shift in + * @idlest_val: u8 * to return the idle status indicator * * Return the CM_IDLEST register address and bit shift corresponding * to the module that "owns" this clock. This default code assumes @@ -185,13 +187,26 @@ void omap2_clk_dflt_find_companion(struct clk *clk, void __iomem **other_reg, * CM_IDLEST2). This is not true for all modules. No return value. */ void omap2_clk_dflt_find_idlest(struct clk *clk, void __iomem **idlest_reg, - u8 *idlest_bit) + u8 *idlest_bit, u8 *idlest_val) { u32 r; r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20); *idlest_reg = (__force void __iomem *)r; *idlest_bit = clk->enable_bit; + + /* + * 24xx uses 0 to indicate not ready, and 1 to indicate ready. + * 34xx reverses this, just to keep us on our toes + * AM35xx uses both, depending on the module. + */ + if (cpu_is_omap24xx()) + *idlest_val = OMAP24XX_CM_IDLEST_VAL; + else if (cpu_is_omap34xx()) + *idlest_val = OMAP34XX_CM_IDLEST_VAL; + else + BUG(); + } int omap2_dflt_clk_enable(struct clk *clk) diff --git a/arch/arm/mach-omap2/clock.h b/arch/arm/mach-omap2/clock.h index fcb99cce5fc..86e32bf2a69 100644 --- a/arch/arm/mach-omap2/clock.h +++ b/arch/arm/mach-omap2/clock.h @@ -114,7 +114,7 @@ void omap2_dflt_clk_disable(struct clk *clk); void omap2_clk_dflt_find_companion(struct clk *clk, void __iomem **other_reg, u8 *other_bit); void omap2_clk_dflt_find_idlest(struct clk *clk, void __iomem **idlest_reg, - u8 *idlest_bit); + u8 *idlest_bit, u8 *idlest_val); void omap2xxx_clk_commit(struct clk *clk); extern u8 cpu_mask; diff --git a/arch/arm/mach-omap2/clock2xxx.c b/arch/arm/mach-omap2/clock2xxx.c index a48b01ab0e3..94fb8a67b50 100644 --- a/arch/arm/mach-omap2/clock2xxx.c +++ b/arch/arm/mach-omap2/clock2xxx.c @@ -42,6 +42,7 @@ struct clk *vclk, *sclk, *dclk; * @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 * * OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the * CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE. This custom function @@ -50,10 +51,12 @@ struct clk *vclk, *sclk, *dclk; */ static void omap2430_clk_i2chs_find_idlest(struct clk *clk, void __iomem **idlest_reg, - u8 *idlest_bit) + u8 *idlest_bit, + u8 *idlest_val) { *idlest_reg = OMAP_CM_REGADDR(CORE_MOD, CM_IDLEST); *idlest_bit = clk->enable_bit; + *idlest_val = OMAP24XX_CM_IDLEST_VAL; } #else diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c index ae9e2c82eb6..49d93efc191 100644 --- a/arch/arm/mach-omap2/clock34xx.c +++ b/arch/arm/mach-omap2/clock34xx.c @@ -47,6 +47,7 @@ struct clk *sdrc_ick_p, *arm_fck_p; * @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 OMAP3430ES2 SSI target CM_IDLEST bit is at a different shift * from the CM_{I,F}CLKEN bit. Pass back the correct info via @@ -54,13 +55,15 @@ struct clk *sdrc_ick_p, *arm_fck_p; */ static void omap3430es2_clk_ssi_find_idlest(struct clk *clk, void __iomem **idlest_reg, - u8 *idlest_bit) + u8 *idlest_bit, + u8 *idlest_val) { u32 r; r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20); *idlest_reg = (__force void __iomem *)r; *idlest_bit = OMAP3430ES2_ST_SSI_IDLE_SHIFT; + *idlest_val = OMAP34XX_CM_IDLEST_VAL; } const struct clkops clkops_omap3430es2_ssi_wait = { @@ -75,6 +78,7 @@ const struct clkops clkops_omap3430es2_ssi_wait = { * @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 * * Some OMAP modules on OMAP3 ES2+ chips have both initiator and * target IDLEST bits. For our purposes, we are concerned with the @@ -85,7 +89,8 @@ const struct clkops clkops_omap3430es2_ssi_wait = { */ static void omap3430es2_clk_dss_usbhost_find_idlest(struct clk *clk, void __iomem **idlest_reg, - u8 *idlest_bit) + u8 *idlest_bit, + u8 *idlest_val) { u32 r; @@ -93,6 +98,7 @@ static void omap3430es2_clk_dss_usbhost_find_idlest(struct clk *clk, *idlest_reg = (__force void __iomem *)r; /* USBHOST_IDLE has same shift */ *idlest_bit = OMAP3430ES2_ST_DSS_IDLE_SHIFT; + *idlest_val = OMAP34XX_CM_IDLEST_VAL; } const struct clkops clkops_omap3430es2_dss_usbhost_wait = { @@ -107,6 +113,7 @@ const struct clkops clkops_omap3430es2_dss_usbhost_wait = { * @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 OMAP3430ES2 HSOTGUSB target CM_IDLEST bit is at a different * shift from the CM_{I,F}CLKEN bit. Pass back the correct info via @@ -114,13 +121,15 @@ const struct clkops clkops_omap3430es2_dss_usbhost_wait = { */ static void omap3430es2_clk_hsotgusb_find_idlest(struct clk *clk, void __iomem **idlest_reg, - u8 *idlest_bit) + u8 *idlest_bit, + u8 *idlest_val) { u32 r; r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20); *idlest_reg = (__force void __iomem *)r; *idlest_bit = OMAP3430ES2_ST_HSOTGUSB_IDLE_SHIFT; + *idlest_val = OMAP34XX_CM_IDLEST_VAL; } const struct clkops clkops_omap3430es2_hsotgusb_wait = { diff --git a/arch/arm/mach-omap2/cm.h b/arch/arm/mach-omap2/cm.h index 4e4ac8ccd7f..94728b1ee3c 100644 --- a/arch/arm/mach-omap2/cm.h +++ b/arch/arm/mach-omap2/cm.h @@ -139,5 +139,8 @@ static inline u32 cm_clear_mod_reg_bits(u32 bits, s16 module, s16 idx) /* CM_IDLEST_GFX */ #define OMAP_ST_GFX (1 << 0) +/* CM_IDLEST indicator */ +#define OMAP24XX_CM_IDLEST_VAL 0 +#define OMAP34XX_CM_IDLEST_VAL 1 #endif diff --git a/arch/arm/mach-omap2/prcm.c b/arch/arm/mach-omap2/prcm.c index e8e121a41d6..0f87fdce02a 100644 --- a/arch/arm/mach-omap2/prcm.c +++ b/arch/arm/mach-omap2/prcm.c @@ -242,26 +242,22 @@ u32 cm_rmw_mod_reg_bits(u32 mask, u32 bits, s16 module, s16 idx) * omap2_cm_wait_idlest - wait for IDLEST bit to indicate module readiness * @reg: physical address of module IDLEST register * @mask: value to mask against to determine if the module is active + * @idlest: idle state indicator (0 or 1) for the clock * @name: name of the clock (for printk) * * Returns 1 if the module indicated readiness in time, or 0 if it * failed to enable in roughly MAX_MODULE_ENABLE_WAIT microseconds. */ -int omap2_cm_wait_idlest(void __iomem *reg, u32 mask, const char *name) +int omap2_cm_wait_idlest(void __iomem *reg, u32 mask, u8 idlest, + const char *name) { int i = 0; int ena = 0; - /* - * 24xx uses 0 to indicate not ready, and 1 to indicate ready. - * 34xx reverses this, just to keep us on our toes - */ - if (cpu_is_omap24xx()) - ena = mask; - else if (cpu_is_omap34xx()) + if (idlest) ena = 0; else - BUG(); + ena = mask; /* Wait for lock */ omap_test_timeout(((__raw_readl(reg) & mask) == ena), -- cgit v1.2.3