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authorHartley Sweeten <hartleys@visionengravers.com>2009-05-07 18:41:47 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-05-16 19:55:56 +0100
commitff05c0330b9880f9ccbb7fa40f2ed3b5842f5693 (patch)
treea1e991f17d63e2c6b6eb1f6ebbbce8068b819ea8 /arch/arm
parentcddb783552f51b5e39fc2db3a34d150d753758e4 (diff)
[ARM] 5509/1: ep93xx: clkdev enable UARTS
Fix the clkdev API support for the ep93xx uart clocks. The uarts available in the ep93xx have individual clock controls. The current implementation assumes that the bootloader has enabled the clocks before the kernel has booted. It also assumes that the bootloader has set the UARTBAUD bit indicating that the uarts are running off the 14.7456MHz external crystal. This fixes both issues. It also allows the uart clocks to be stopped when there are no users. Tested-by: Matthias Kaehlcke <matthias@kaehlcke.net> Cc: Ryan Mallon <ryan@bluewatersys.com> Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-ep93xx/clock.c69
-rw-r--r--arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h5
2 files changed, 65 insertions, 9 deletions
diff --git a/arch/arm/mach-ep93xx/clock.c b/arch/arm/mach-ep93xx/clock.c
index e8ebeaea6c4..b2eede5531c 100644
--- a/arch/arm/mach-ep93xx/clock.c
+++ b/arch/arm/mach-ep93xx/clock.c
@@ -21,15 +21,50 @@
#include <asm/div64.h>
#include <mach/hardware.h>
+
+/*
+ * The EP93xx has two external crystal oscillators. To generate the
+ * required high-frequency clocks, the processor uses two phase-locked-
+ * loops (PLLs) to multiply the incoming external clock signal to much
+ * higher frequencies that are then divided down by programmable dividers
+ * to produce the needed clocks. The PLLs operate independently of one
+ * another.
+ */
+#define EP93XX_EXT_CLK_RATE 14745600
+#define EP93XX_EXT_RTC_RATE 32768
+
+
struct clk {
unsigned long rate;
int users;
+ int sw_locked;
u32 enable_reg;
u32 enable_mask;
+
+ unsigned long (*get_rate)(struct clk *clk);
};
-static struct clk clk_uart = {
- .rate = 14745600,
+
+static unsigned long get_uart_rate(struct clk *clk);
+
+
+static struct clk clk_uart1 = {
+ .sw_locked = 1,
+ .enable_reg = EP93XX_SYSCON_DEVICE_CONFIG,
+ .enable_mask = EP93XX_SYSCON_DEVICE_CONFIG_U1EN,
+ .get_rate = get_uart_rate,
+};
+static struct clk clk_uart2 = {
+ .sw_locked = 1,
+ .enable_reg = EP93XX_SYSCON_DEVICE_CONFIG,
+ .enable_mask = EP93XX_SYSCON_DEVICE_CONFIG_U2EN,
+ .get_rate = get_uart_rate,
+};
+static struct clk clk_uart3 = {
+ .sw_locked = 1,
+ .enable_reg = EP93XX_SYSCON_DEVICE_CONFIG,
+ .enable_mask = EP93XX_SYSCON_DEVICE_CONFIG_U3EN,
+ .get_rate = get_uart_rate,
};
static struct clk clk_pll1;
static struct clk clk_f;
@@ -95,9 +130,9 @@ static struct clk clk_m2m1 = {
{ .dev_id = dev, .con_id = con, .clk = ck }
static struct clk_lookup clocks[] = {
- INIT_CK("apb:uart1", NULL, &clk_uart),
- INIT_CK("apb:uart2", NULL, &clk_uart),
- INIT_CK("apb:uart3", NULL, &clk_uart),
+ INIT_CK("apb:uart1", NULL, &clk_uart1),
+ INIT_CK("apb:uart2", NULL, &clk_uart2),
+ INIT_CK("apb:uart3", NULL, &clk_uart3),
INIT_CK(NULL, "pll1", &clk_pll1),
INIT_CK(NULL, "fclk", &clk_f),
INIT_CK(NULL, "hclk", &clk_h),
@@ -125,6 +160,8 @@ int clk_enable(struct clk *clk)
u32 value;
value = __raw_readl(clk->enable_reg);
+ if (clk->sw_locked)
+ __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
__raw_writel(value | clk->enable_mask, clk->enable_reg);
}
@@ -138,13 +175,29 @@ void clk_disable(struct clk *clk)
u32 value;
value = __raw_readl(clk->enable_reg);
+ if (clk->sw_locked)
+ __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
__raw_writel(value & ~clk->enable_mask, clk->enable_reg);
}
}
EXPORT_SYMBOL(clk_disable);
+static unsigned long get_uart_rate(struct clk *clk)
+{
+ u32 value;
+
+ value = __raw_readl(EP93XX_SYSCON_CLOCK_CONTROL);
+ if (value & EP93XX_SYSCON_CLOCK_UARTBAUD)
+ return EP93XX_EXT_CLK_RATE;
+ else
+ return EP93XX_EXT_CLK_RATE / 2;
+}
+
unsigned long clk_get_rate(struct clk *clk)
{
+ if (clk->get_rate)
+ return clk->get_rate(clk);
+
return clk->rate;
}
EXPORT_SYMBOL(clk_get_rate);
@@ -162,7 +215,7 @@ static unsigned long calc_pll_rate(u32 config_word)
unsigned long long rate;
int i;
- rate = 14745600;
+ rate = EP93XX_EXT_CLK_RATE;
rate *= ((config_word >> 11) & 0x1f) + 1; /* X1FBD */
rate *= ((config_word >> 5) & 0x3f) + 1; /* X2FBD */
do_div(rate, (config_word & 0x1f) + 1); /* X2IPD */
@@ -195,7 +248,7 @@ static int __init ep93xx_clock_init(void)
value = __raw_readl(EP93XX_SYSCON_CLOCK_SET1);
if (!(value & 0x00800000)) { /* PLL1 bypassed? */
- clk_pll1.rate = 14745600;
+ clk_pll1.rate = EP93XX_EXT_CLK_RATE;
} else {
clk_pll1.rate = calc_pll_rate(value);
}
@@ -206,7 +259,7 @@ static int __init ep93xx_clock_init(void)
value = __raw_readl(EP93XX_SYSCON_CLOCK_SET2);
if (!(value & 0x00080000)) { /* PLL2 bypassed? */
- clk_pll2.rate = 14745600;
+ clk_pll2.rate = EP93XX_EXT_CLK_RATE;
} else if (value & 0x00040000) { /* PLL2 enabled? */
clk_pll2.rate = calc_pll_rate(value);
} else {
diff --git a/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h b/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h
index f66be12b856..1732de7629a 100644
--- a/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h
+++ b/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h
@@ -159,7 +159,10 @@
#define EP93XX_SYSCON_CLOCK_SET1 EP93XX_SYSCON_REG(0x20)
#define EP93XX_SYSCON_CLOCK_SET2 EP93XX_SYSCON_REG(0x24)
#define EP93XX_SYSCON_DEVICE_CONFIG EP93XX_SYSCON_REG(0x80)
-#define EP93XX_SYSCON_DEVICE_CONFIG_CRUNCH_ENABLE 0x00800000
+#define EP93XX_SYSCON_DEVICE_CONFIG_U3EN (1<<24)
+#define EP93XX_SYSCON_DEVICE_CONFIG_CRUNCH_ENABLE (1<<23)
+#define EP93XX_SYSCON_DEVICE_CONFIG_U2EN (1<<20)
+#define EP93XX_SYSCON_DEVICE_CONFIG_U1EN (1<<18)
#define EP93XX_SYSCON_SWLOCK EP93XX_SYSCON_REG(0xc0)
#define EP93XX_WATCHDOG_BASE (EP93XX_APB_VIRT_BASE + 0x00140000)