davinci: major rework of clock, PLL, PSC infrastructure
This is a significant rework of the low-level clock, PLL and Power
Sleep Controller (PSC) implementation for the DaVinci family. The
primary goal is to have better modeling if the hardware clocks and
features with the aim of DVFS functionality.
Highlights:
- model PLLs and all PLL-derived clocks
- model parent/child relationships of PLLs and clocks
- convert to new clkdev layer
- view clock frequency and refcount via /proc/davinci_clocks
Special thanks to significant contributions and testing by David
Brownell.
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index bb57f35..cfd9964 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -586,6 +586,7 @@
select HAVE_CLK
select ZONE_DMA
select HAVE_IDE
+ select COMMON_CLKDEV
help
Support for TI's DaVinci platform.
diff --git a/arch/arm/mach-davinci/Kconfig b/arch/arm/mach-davinci/Kconfig
index bac988e..af88673 100644
--- a/arch/arm/mach-davinci/Kconfig
+++ b/arch/arm/mach-davinci/Kconfig
@@ -18,6 +18,18 @@
Configure this option to specify the whether the board used
for development is a DaVinci EVM
+config DAVINCI_RESET_CLOCKS
+ bool "Reset unused clocks during boot"
+ depends on ARCH_DAVINCI
+ help
+ Say Y if you want to reset unused clocks during boot.
+ This option saves power, but assumes all drivers are
+ using the clock framework. Broken drivers that do not
+ yet use clock framework may not work with this option.
+ If you are booting from another operating system, you
+ probably do not want this option enabled until your
+ device drivers work properly.
+
endmenu
endif
diff --git a/arch/arm/mach-davinci/board-evm.c b/arch/arm/mach-davinci/board-evm.c
index 0b97a52..1b745c3 100644
--- a/arch/arm/mach-davinci/board-evm.c
+++ b/arch/arm/mach-davinci/board-evm.c
@@ -406,8 +406,6 @@
static __init void davinci_evm_init(void)
{
- davinci_psc_init();
-
#if defined(CONFIG_BLK_DEV_PALMCHIP_BK3710) || \
defined(CONFIG_BLK_DEV_PALMCHIP_BK3710_MODULE)
#if defined(CONFIG_MTD_PHYSMAP) || \
diff --git a/arch/arm/mach-davinci/clock.c b/arch/arm/mach-davinci/clock.c
index abb92b7..f0baaa1 100644
--- a/arch/arm/mach-davinci/clock.c
+++ b/arch/arm/mach-davinci/clock.c
@@ -1,7 +1,8 @@
/*
- * TI DaVinci clock config file
+ * Clock and PLL control for DaVinci devices
*
- * Copyright (C) 2006 Texas Instruments.
+ * Copyright (C) 2006-2007 Texas Instruments.
+ * Copyright (C) 2008-2009 Deep Root Systems, LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -13,6 +14,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
+#include <linux/clk.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
@@ -21,98 +23,50 @@
#include <mach/hardware.h>
#include <mach/psc.h>
+#include <mach/cputype.h>
#include "clock.h"
-/* PLL/Reset register offsets */
-#define PLLM 0x110
-
static LIST_HEAD(clocks);
static DEFINE_MUTEX(clocks_mutex);
static DEFINE_SPINLOCK(clockfw_lock);
-static unsigned int commonrate;
-static unsigned int armrate;
-static unsigned int fixedrate = 27000000; /* 27 MHZ */
-
-extern void davinci_psc_config(unsigned int domain, unsigned int id, char enable);
-
-/*
- * Returns a clock. Note that we first try to use device id on the bus
- * and clock name. If this fails, we try to use clock name only.
- */
-struct clk *clk_get(struct device *dev, const char *id)
+static unsigned psc_domain(struct clk *clk)
{
- struct clk *p, *clk = ERR_PTR(-ENOENT);
- int idno;
-
- if (dev == NULL || dev->bus != &platform_bus_type)
- idno = -1;
- else
- idno = to_platform_device(dev)->id;
-
- mutex_lock(&clocks_mutex);
-
- list_for_each_entry(p, &clocks, node) {
- if (p->id == idno &&
- strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
- clk = p;
- goto found;
- }
- }
-
- list_for_each_entry(p, &clocks, node) {
- if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
- clk = p;
- break;
- }
- }
-
-found:
- mutex_unlock(&clocks_mutex);
-
- return clk;
+ return (clk->flags & PSC_DSP)
+ ? DAVINCI_GPSC_DSPDOMAIN
+ : DAVINCI_GPSC_ARMDOMAIN;
}
-EXPORT_SYMBOL(clk_get);
-void clk_put(struct clk *clk)
+static void __clk_enable(struct clk *clk)
{
- if (clk && !IS_ERR(clk))
- module_put(clk->owner);
-}
-EXPORT_SYMBOL(clk_put);
-
-static int __clk_enable(struct clk *clk)
-{
- if (clk->flags & ALWAYS_ENABLED)
- return 0;
-
- davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, clk->lpsc, 1);
- return 0;
+ if (clk->parent)
+ __clk_enable(clk->parent);
+ if (clk->usecount++ == 0 && (clk->flags & CLK_PSC))
+ davinci_psc_config(psc_domain(clk), clk->lpsc, 1);
}
static void __clk_disable(struct clk *clk)
{
- if (clk->usecount)
+ if (WARN_ON(clk->usecount == 0))
return;
-
- davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, clk->lpsc, 0);
+ if (--clk->usecount == 0 && !(clk->flags & CLK_PLL))
+ davinci_psc_config(psc_domain(clk), clk->lpsc, 0);
+ if (clk->parent)
+ __clk_disable(clk->parent);
}
int clk_enable(struct clk *clk)
{
unsigned long flags;
- int ret = 0;
if (clk == NULL || IS_ERR(clk))
return -EINVAL;
- if (clk->usecount++ == 0) {
- spin_lock_irqsave(&clockfw_lock, flags);
- ret = __clk_enable(clk);
- spin_unlock_irqrestore(&clockfw_lock, flags);
- }
+ spin_lock_irqsave(&clockfw_lock, flags);
+ __clk_enable(clk);
+ spin_unlock_irqrestore(&clockfw_lock, flags);
- return ret;
+ return 0;
}
EXPORT_SYMBOL(clk_enable);
@@ -123,11 +77,9 @@
if (clk == NULL || IS_ERR(clk))
return;
- if (clk->usecount > 0 && !(--clk->usecount)) {
- spin_lock_irqsave(&clockfw_lock, flags);
- __clk_disable(clk);
- spin_unlock_irqrestore(&clockfw_lock, flags);
- }
+ spin_lock_irqsave(&clockfw_lock, flags);
+ __clk_disable(clk);
+ spin_unlock_irqrestore(&clockfw_lock, flags);
}
EXPORT_SYMBOL(clk_disable);
@@ -136,7 +88,7 @@
if (clk == NULL || IS_ERR(clk))
return -EINVAL;
- return *(clk->rate);
+ return clk->rate;
}
EXPORT_SYMBOL(clk_get_rate);
@@ -145,7 +97,7 @@
if (clk == NULL || IS_ERR(clk))
return -EINVAL;
- return *(clk->rate);
+ return clk->rate;
}
EXPORT_SYMBOL(clk_round_rate);
@@ -164,10 +116,23 @@
if (clk == NULL || IS_ERR(clk))
return -EINVAL;
+ if (WARN(clk->parent && !clk->parent->rate,
+ "CLK: %s parent %s has no rate!\n",
+ clk->name, clk->parent->name))
+ return -EINVAL;
+
mutex_lock(&clocks_mutex);
- list_add(&clk->node, &clocks);
+ list_add_tail(&clk->node, &clocks);
mutex_unlock(&clocks_mutex);
+ /* If rate is already set, use it */
+ if (clk->rate)
+ return 0;
+
+ /* Otherwise, default to parent rate */
+ if (clk->parent)
+ clk->rate = clk->parent->rate;
+
return 0;
}
EXPORT_SYMBOL(clk_register);
@@ -183,84 +148,150 @@
}
EXPORT_SYMBOL(clk_unregister);
-static struct clk davinci_clks[] = {
- {
- .name = "ARMCLK",
- .rate = &armrate,
- .lpsc = -1,
- .flags = ALWAYS_ENABLED,
- },
- {
- .name = "UART",
- .rate = &fixedrate,
- .lpsc = DAVINCI_LPSC_UART0,
- },
- {
- .name = "EMACCLK",
- .rate = &commonrate,
- .lpsc = DAVINCI_LPSC_EMAC_WRAPPER,
- },
- {
- .name = "I2CCLK",
- .rate = &fixedrate,
- .lpsc = DAVINCI_LPSC_I2C,
- },
- {
- .name = "IDECLK",
- .rate = &commonrate,
- .lpsc = DAVINCI_LPSC_ATA,
- },
- {
- .name = "McBSPCLK",
- .rate = &commonrate,
- .lpsc = DAVINCI_LPSC_McBSP,
- },
- {
- .name = "MMCSDCLK",
- .rate = &commonrate,
- .lpsc = DAVINCI_LPSC_MMC_SD,
- },
- {
- .name = "SPICLK",
- .rate = &commonrate,
- .lpsc = DAVINCI_LPSC_SPI,
- },
- {
- .name = "gpio",
- .rate = &commonrate,
- .lpsc = DAVINCI_LPSC_GPIO,
- },
- {
- .name = "usb",
- .rate = &commonrate,
- .lpsc = DAVINCI_LPSC_USB,
- },
- {
- .name = "AEMIFCLK",
- .rate = &commonrate,
- .lpsc = DAVINCI_LPSC_AEMIF,
- .usecount = 1,
- }
-};
-
-int __init davinci_clk_init(void)
+#ifdef CONFIG_DAVINCI_RESET_CLOCKS
+/*
+ * Disable any unused clocks left on by the bootloader
+ */
+static int __init clk_disable_unused(void)
{
- struct clk *clkp;
- int count = 0;
- u32 pll_mult;
+ struct clk *ck;
- pll_mult = davinci_readl(DAVINCI_PLL_CNTRL0_BASE + PLLM);
- commonrate = ((pll_mult + 1) * 27000000) / 6;
- armrate = ((pll_mult + 1) * 27000000) / 2;
+ spin_lock_irq(&clockfw_lock);
+ list_for_each_entry(ck, &clocks, node) {
+ if (ck->usecount > 0)
+ continue;
+ if (!(ck->flags & CLK_PSC))
+ continue;
- for (clkp = davinci_clks; count < ARRAY_SIZE(davinci_clks);
- count++, clkp++) {
- clk_register(clkp);
+ /* ignore if in Disabled or SwRstDisable states */
+ if (!davinci_psc_is_clk_active(ck->lpsc))
+ continue;
- /* Turn on clocks that have been enabled in the
- * table above */
- if (clkp->usecount)
- clk_enable(clkp);
+ pr_info("Clocks: disable unused %s\n", ck->name);
+ davinci_psc_config(psc_domain(ck), ck->lpsc, 0);
+ }
+ spin_unlock_irq(&clockfw_lock);
+
+ return 0;
+}
+late_initcall(clk_disable_unused);
+#endif
+
+static void clk_sysclk_recalc(struct clk *clk)
+{
+ u32 v, plldiv;
+ struct pll_data *pll;
+
+ /* If this is the PLL base clock, no more calculations needed */
+ if (clk->pll_data)
+ return;
+
+ if (WARN_ON(!clk->parent))
+ return;
+
+ clk->rate = clk->parent->rate;
+
+ /* Otherwise, the parent must be a PLL */
+ if (WARN_ON(!clk->parent->pll_data))
+ return;
+
+ pll = clk->parent->pll_data;
+
+ /* If pre-PLL, source clock is before the multiplier and divider(s) */
+ if (clk->flags & PRE_PLL)
+ clk->rate = pll->input_rate;
+
+ if (!clk->div_reg)
+ return;
+
+ v = __raw_readl(pll->base + clk->div_reg);
+ if (v & PLLDIV_EN) {
+ plldiv = (v & PLLDIV_RATIO_MASK) + 1;
+ if (plldiv)
+ clk->rate /= plldiv;
+ }
+}
+
+static void __init clk_pll_init(struct clk *clk)
+{
+ u32 ctrl, mult = 1, prediv = 1, postdiv = 1;
+ u8 bypass;
+ struct pll_data *pll = clk->pll_data;
+
+ pll->base = IO_ADDRESS(pll->phys_base);
+ ctrl = __raw_readl(pll->base + PLLCTL);
+ clk->rate = pll->input_rate = clk->parent->rate;
+
+ if (ctrl & PLLCTL_PLLEN) {
+ bypass = 0;
+ mult = __raw_readl(pll->base + PLLM);
+ mult = (mult & PLLM_PLLM_MASK) + 1;
+ } else
+ bypass = 1;
+
+ if (pll->flags & PLL_HAS_PREDIV) {
+ prediv = __raw_readl(pll->base + PREDIV);
+ if (prediv & PLLDIV_EN)
+ prediv = (prediv & PLLDIV_RATIO_MASK) + 1;
+ else
+ prediv = 1;
+ }
+
+ /* pre-divider is fixed, but (some?) chips won't report that */
+ if (cpu_is_davinci_dm355() && pll->num == 1)
+ prediv = 8;
+
+ if (pll->flags & PLL_HAS_POSTDIV) {
+ postdiv = __raw_readl(pll->base + POSTDIV);
+ if (postdiv & PLLDIV_EN)
+ postdiv = (postdiv & PLLDIV_RATIO_MASK) + 1;
+ else
+ postdiv = 1;
+ }
+
+ if (!bypass) {
+ clk->rate /= prediv;
+ clk->rate *= mult;
+ clk->rate /= postdiv;
+ }
+
+ pr_debug("PLL%d: input = %lu MHz [ ",
+ pll->num, clk->parent->rate / 1000000);
+ if (bypass)
+ pr_debug("bypass ");
+ if (prediv > 1)
+ pr_debug("/ %d ", prediv);
+ if (mult > 1)
+ pr_debug("* %d ", mult);
+ if (postdiv > 1)
+ pr_debug("/ %d ", postdiv);
+ pr_debug("] --> %lu MHz output.\n", clk->rate / 1000000);
+}
+
+int __init davinci_clk_init(struct davinci_clk *clocks)
+ {
+ struct davinci_clk *c;
+ struct clk *clk;
+
+ for (c = clocks; c->lk.clk; c++) {
+ clk = c->lk.clk;
+
+ if (clk->pll_data)
+ clk_pll_init(clk);
+
+ /* Calculate rates for PLL-derived clocks */
+ else if (clk->flags & CLK_PLL)
+ clk_sysclk_recalc(clk);
+
+ if (clk->lpsc)
+ clk->flags |= CLK_PSC;
+
+ clkdev_add(&c->lk);
+ clk_register(clk);
+
+ /* Turn on clocks that Linux doesn't otherwise manage */
+ if (clk->flags & ALWAYS_ENABLED)
+ clk_enable(clk);
}
return 0;
@@ -285,12 +316,52 @@
{
}
+#define CLKNAME_MAX 10 /* longest clock name */
+#define NEST_DELTA 2
+#define NEST_MAX 4
+
+static void
+dump_clock(struct seq_file *s, unsigned nest, struct clk *parent)
+{
+ char *state;
+ char buf[CLKNAME_MAX + NEST_DELTA * NEST_MAX];
+ struct clk *clk;
+ unsigned i;
+
+ if (parent->flags & CLK_PLL)
+ state = "pll";
+ else if (parent->flags & CLK_PSC)
+ state = "psc";
+ else
+ state = "";
+
+ /* <nest spaces> name <pad to end> */
+ memset(buf, ' ', sizeof(buf) - 1);
+ buf[sizeof(buf) - 1] = 0;
+ i = strlen(parent->name);
+ memcpy(buf + nest, parent->name,
+ min(i, (unsigned)(sizeof(buf) - 1 - nest)));
+
+ seq_printf(s, "%s users=%2d %-3s %9ld Hz\n",
+ buf, parent->usecount, state, clk_get_rate(parent));
+ /* REVISIT show device associations too */
+
+ /* cost is now small, but not linear... */
+ list_for_each_entry(clk, &clocks, node) {
+ if (clk->parent == parent)
+ dump_clock(s, nest + NEST_DELTA, clk);
+ }
+}
+
static int davinci_ck_show(struct seq_file *m, void *v)
{
- struct clk *cp;
-
- list_for_each_entry(cp, &clocks, node)
- seq_printf(m,"%s %d %d\n", cp->name, *(cp->rate), cp->usecount);
+ /* Show clock tree; we know the main oscillator is first.
+ * We trust nonzero usecounts equate to PSC enables...
+ */
+ mutex_lock(&clocks_mutex);
+ if (!list_empty(&clocks))
+ dump_clock(m, 0, list_first_entry(&clocks, struct clk, node));
+ mutex_unlock(&clocks_mutex);
return 0;
}
@@ -321,4 +392,4 @@
}
__initcall(davinci_ck_proc_init);
-#endif /* CONFIG_DEBUG_PROC_FS */
+#endif /* CONFIG_DEBUG_PROC_FS */
diff --git a/arch/arm/mach-davinci/clock.h b/arch/arm/mach-davinci/clock.h
index ed47079..35736ec 100644
--- a/arch/arm/mach-davinci/clock.h
+++ b/arch/arm/mach-davinci/clock.h
@@ -1,7 +1,8 @@
/*
* TI DaVinci clock definitions
*
- * Copyright (C) 2006 Texas Instruments.
+ * Copyright (C) 2006-2007 Texas Instruments.
+ * Copyright (C) 2008-2009 Deep Root Systems, LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -11,23 +12,85 @@
#ifndef __ARCH_ARM_DAVINCI_CLOCK_H
#define __ARCH_ARM_DAVINCI_CLOCK_H
+#include <linux/list.h>
+#include <asm/clkdev.h>
+
+#define DAVINCI_PLL1_BASE 0x01c40800
+#define DAVINCI_PLL2_BASE 0x01c40c00
+#define MAX_PLL 2
+
+/* PLL/Reset register offsets */
+#define PLLCTL 0x100
+#define PLLCTL_PLLEN BIT(0)
+#define PLLCTL_CLKMODE BIT(8)
+
+#define PLLM 0x110
+#define PLLM_PLLM_MASK 0xff
+
+#define PREDIV 0x114
+#define PLLDIV1 0x118
+#define PLLDIV2 0x11c
+#define PLLDIV3 0x120
+#define POSTDIV 0x128
+#define BPDIV 0x12c
+#define PLLCMD 0x138
+#define PLLSTAT 0x13c
+#define PLLALNCTL 0x140
+#define PLLDCHANGE 0x144
+#define PLLCKEN 0x148
+#define PLLCKSTAT 0x14c
+#define PLLSYSTAT 0x150
+#define PLLDIV4 0x160
+#define PLLDIV5 0x164
+#define PLLDIV6 0x168
+#define PLLDIV7 0x16c
+#define PLLDIV8 0x170
+#define PLLDIV9 0x174
+#define PLLDIV_EN BIT(15)
+#define PLLDIV_RATIO_MASK 0x1f
+
+struct pll_data {
+ u32 phys_base;
+ void __iomem *base;
+ u32 num;
+ u32 flags;
+ u32 input_rate;
+};
+#define PLL_HAS_PREDIV 0x01
+#define PLL_HAS_POSTDIV 0x02
+
struct clk {
struct list_head node;
struct module *owner;
const char *name;
- unsigned int *rate;
- int id;
- __s8 usecount;
- __u8 flags;
- __u8 lpsc;
+ unsigned long rate;
+ u8 usecount;
+ u8 flags;
+ u8 lpsc;
+ struct clk *parent;
+ struct pll_data *pll_data;
+ u32 div_reg;
};
/* Clock flags */
-#define RATE_CKCTL 1
-#define RATE_FIXED 2
-#define RATE_PROPAGATES 4
-#define VIRTUAL_CLOCK 8
-#define ALWAYS_ENABLED 16
-#define ENABLE_REG_32BIT 32
+#define ALWAYS_ENABLED BIT(1)
+#define CLK_PSC BIT(2)
+#define PSC_DSP BIT(3) /* PSC uses DSP domain, not ARM */
+#define CLK_PLL BIT(4) /* PLL-derived clock */
+#define PRE_PLL BIT(5) /* source is before PLL mult/div */
+struct davinci_clk {
+ struct clk_lookup lk;
+};
+
+#define CLK(dev, con, ck) \
+ { \
+ .lk = { \
+ .dev_id = dev, \
+ .con_id = con, \
+ .clk = ck, \
+ }, \
+ }
+
+int davinci_clk_init(struct davinci_clk *clocks);
#endif
diff --git a/arch/arm/mach-davinci/include/mach/clkdev.h b/arch/arm/mach-davinci/include/mach/clkdev.h
new file mode 100644
index 0000000..730c49d
--- /dev/null
+++ b/arch/arm/mach-davinci/include/mach/clkdev.h
@@ -0,0 +1,13 @@
+#ifndef __MACH_CLKDEV_H
+#define __MACH_CLKDEV_H
+
+static inline int __clk_get(struct clk *clk)
+{
+ return 1;
+}
+
+static inline void __clk_put(struct clk *clk)
+{
+}
+
+#endif
diff --git a/arch/arm/mach-davinci/include/mach/clock.h b/arch/arm/mach-davinci/include/mach/clock.h
index 38bdd49..a3b0402 100644
--- a/arch/arm/mach-davinci/include/mach/clock.h
+++ b/arch/arm/mach-davinci/include/mach/clock.h
@@ -17,6 +17,5 @@
extern int clk_register(struct clk *clk);
extern void clk_unregister(struct clk *clk);
-extern int davinci_clk_init(void);
#endif
diff --git a/arch/arm/mach-davinci/include/mach/psc.h b/arch/arm/mach-davinci/include/mach/psc.h
index 4977aa0..55a90d4 100644
--- a/arch/arm/mach-davinci/include/mach/psc.h
+++ b/arch/arm/mach-davinci/include/mach/psc.h
@@ -38,8 +38,6 @@
#define DAVINCI_LPSC_TPTC1 4
#define DAVINCI_LPSC_EMAC 5
#define DAVINCI_LPSC_EMAC_WRAPPER 6
-#define DAVINCI_LPSC_MDIO 7
-#define DAVINCI_LPSC_IEEE1394 8
#define DAVINCI_LPSC_USB 9
#define DAVINCI_LPSC_ATA 10
#define DAVINCI_LPSC_VLYNQ 11
@@ -47,7 +45,6 @@
#define DAVINCI_LPSC_DDR_EMIF 13
#define DAVINCI_LPSC_AEMIF 14
#define DAVINCI_LPSC_MMC_SD 15
-#define DAVINCI_LPSC_MEMSTICK 16
#define DAVINCI_LPSC_McBSP 17
#define DAVINCI_LPSC_I2C 18
#define DAVINCI_LPSC_UART0 19
@@ -73,4 +70,54 @@
#define DAVINCI_LPSC_GEM 39
#define DAVINCI_LPSC_IMCOP 40
+#define DM355_LPSC_TIMER3 5
+#define DM355_LPSC_SPI1 6
+#define DM355_LPSC_MMC_SD1 7
+#define DM355_LPSC_McBSP1 8
+#define DM355_LPSC_PWM3 10
+#define DM355_LPSC_SPI2 11
+#define DM355_LPSC_RTO 12
+#define DM355_LPSC_VPSS_DAC 41
+
+/*
+ * LPSC Assignments
+ */
+#define DM646X_LPSC_ARM 0
+#define DM646X_LPSC_C64X_CPU 1
+#define DM646X_LPSC_HDVICP0 2
+#define DM646X_LPSC_HDVICP1 3
+#define DM646X_LPSC_TPCC 4
+#define DM646X_LPSC_TPTC0 5
+#define DM646X_LPSC_TPTC1 6
+#define DM646X_LPSC_TPTC2 7
+#define DM646X_LPSC_TPTC3 8
+#define DM646X_LPSC_PCI 13
+#define DM646X_LPSC_EMAC 14
+#define DM646X_LPSC_VDCE 15
+#define DM646X_LPSC_VPSSMSTR 16
+#define DM646X_LPSC_VPSSSLV 17
+#define DM646X_LPSC_TSIF0 18
+#define DM646X_LPSC_TSIF1 19
+#define DM646X_LPSC_DDR_EMIF 20
+#define DM646X_LPSC_AEMIF 21
+#define DM646X_LPSC_McASP0 22
+#define DM646X_LPSC_McASP1 23
+#define DM646X_LPSC_CRGEN0 24
+#define DM646X_LPSC_CRGEN1 25
+#define DM646X_LPSC_UART0 26
+#define DM646X_LPSC_UART1 27
+#define DM646X_LPSC_UART2 28
+#define DM646X_LPSC_PWM0 29
+#define DM646X_LPSC_PWM1 30
+#define DM646X_LPSC_I2C 31
+#define DM646X_LPSC_SPI 32
+#define DM646X_LPSC_GPIO 33
+#define DM646X_LPSC_TIMER0 34
+#define DM646X_LPSC_TIMER1 35
+#define DM646X_LPSC_ARM_INTC 45
+
+extern int davinci_psc_is_clk_active(unsigned int id);
+extern void davinci_psc_config(unsigned int domain, unsigned int id,
+ char enable);
+
#endif /* __ASM_ARCH_PSC_H */
diff --git a/arch/arm/mach-davinci/io.c b/arch/arm/mach-davinci/io.c
index 299515f..71a7ae3 100644
--- a/arch/arm/mach-davinci/io.c
+++ b/arch/arm/mach-davinci/io.c
@@ -53,5 +53,4 @@
void __init davinci_init_common_hw(void)
{
- davinci_clk_init();
}
diff --git a/arch/arm/mach-davinci/psc.c b/arch/arm/mach-davinci/psc.c
index 58754f0..c509883 100644
--- a/arch/arm/mach-davinci/psc.c
+++ b/arch/arm/mach-davinci/psc.c
@@ -23,6 +23,7 @@
#include <linux/init.h>
#include <linux/io.h>
+#include <mach/cputype.h>
#include <mach/hardware.h>
#include <mach/psc.h>
#include <mach/mux.h>
@@ -36,76 +37,57 @@
#define MDSTAT 0x800
#define MDCTL 0xA00
-/* System control register offsets */
-#define VDD3P3V_PWDN 0x48
-static void davinci_psc_mux(unsigned int id)
+/* Return nonzero iff the domain's clock is active */
+int __init davinci_psc_is_clk_active(unsigned int id)
{
- switch (id) {
- case DAVINCI_LPSC_ATA:
- davinci_mux_peripheral(DAVINCI_MUX_HDIREN, 1);
- davinci_mux_peripheral(DAVINCI_MUX_ATAEN, 1);
- break;
- case DAVINCI_LPSC_MMC_SD:
- /* VDD power manupulations are done in U-Boot for CPMAC
- * so applies to MMC as well
- */
- /*Set up the pull regiter for MMC */
- davinci_writel(0, DAVINCI_SYSTEM_MODULE_BASE + VDD3P3V_PWDN);
- davinci_mux_peripheral(DAVINCI_MUX_MSTK, 0);
- break;
- case DAVINCI_LPSC_I2C:
- davinci_mux_peripheral(DAVINCI_MUX_I2C, 1);
- break;
- case DAVINCI_LPSC_McBSP:
- davinci_mux_peripheral(DAVINCI_MUX_ASP, 1);
- break;
- default:
- break;
- }
+ void __iomem *psc_base = IO_ADDRESS(DAVINCI_PWR_SLEEP_CNTRL_BASE);
+ u32 mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
+
+ /* if clocked, state can be "Enable" or "SyncReset" */
+ return mdstat & BIT(12);
}
/* Enable or disable a PSC domain */
void davinci_psc_config(unsigned int domain, unsigned int id, char enable)
{
u32 epcpr, ptcmd, ptstat, pdstat, pdctl1, mdstat, mdctl, mdstat_mask;
+ void __iomem *psc_base = IO_ADDRESS(DAVINCI_PWR_SLEEP_CNTRL_BASE);
- mdctl = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + MDCTL + 4 * id);
+ mdctl = __raw_readl(psc_base + MDCTL + 4 * id);
if (enable)
mdctl |= 0x00000003; /* Enable Module */
else
- mdctl &= 0xFFFFFFF2; /* Disable Module */
- davinci_writel(mdctl, DAVINCI_PWR_SLEEP_CNTRL_BASE + MDCTL + 4 * id);
+ mdctl &= 0xFFFFFFE2; /* Disable Module */
+ __raw_writel(mdctl, psc_base + MDCTL + 4 * id);
- pdstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDSTAT);
+ pdstat = __raw_readl(psc_base + PDSTAT);
if ((pdstat & 0x00000001) == 0) {
- pdctl1 = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
+ pdctl1 = __raw_readl(psc_base + PDCTL1);
pdctl1 |= 0x1;
- davinci_writel(pdctl1, DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
+ __raw_writel(pdctl1, psc_base + PDCTL1);
ptcmd = 1 << domain;
- davinci_writel(ptcmd, DAVINCI_PWR_SLEEP_CNTRL_BASE + PTCMD);
+ __raw_writel(ptcmd, psc_base + PTCMD);
do {
- epcpr = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
- EPCPR);
+ epcpr = __raw_readl(psc_base + EPCPR);
} while ((((epcpr >> domain) & 1) == 0));
- pdctl1 = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
+ pdctl1 = __raw_readl(psc_base + PDCTL1);
pdctl1 |= 0x100;
- davinci_writel(pdctl1, DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
+ __raw_writel(pdctl1, psc_base + PDCTL1);
do {
- ptstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
+ ptstat = __raw_readl(psc_base +
PTSTAT);
} while (!(((ptstat >> domain) & 1) == 0));
} else {
ptcmd = 1 << domain;
- davinci_writel(ptcmd, DAVINCI_PWR_SLEEP_CNTRL_BASE + PTCMD);
+ __raw_writel(ptcmd, psc_base + PTCMD);
do {
- ptstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
- PTSTAT);
+ ptstat = __raw_readl(psc_base + PTSTAT);
} while (!(((ptstat >> domain) & 1) == 0));
}
@@ -115,23 +97,6 @@
mdstat_mask = 0x2;
do {
- mdstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
- MDSTAT + 4 * id);
+ mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
} while (!((mdstat & 0x0000001F) == mdstat_mask));
-
- if (enable)
- davinci_psc_mux(id);
-}
-
-void __init davinci_psc_init(void)
-{
- davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_VPSSMSTR, 1);
- davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_VPSSSLV, 1);
- davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPCC, 1);
- davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPTC0, 1);
- davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPTC1, 1);
- davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_GPIO, 1);
-
- /* Turn on WatchDog timer LPSC. Needed for RESET to work */
- davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TIMER2, 1);
}