diff options
Diffstat (limited to 'arch/mips/alchemy/common')
| -rw-r--r-- | arch/mips/alchemy/common/clocks.c | 54 | ||||
| -rw-r--r-- | arch/mips/alchemy/common/setup.c | 9 | ||||
| -rw-r--r-- | arch/mips/alchemy/common/time.c | 54 |
3 files changed, 63 insertions, 54 deletions
diff --git a/arch/mips/alchemy/common/clocks.c b/arch/mips/alchemy/common/clocks.c index a8170fda4932..d8991854530e 100644 --- a/arch/mips/alchemy/common/clocks.c +++ b/arch/mips/alchemy/common/clocks.c @@ -27,11 +27,21 @@ */ #include <linux/module.h> +#include <linux/spinlock.h> +#include <asm/time.h> #include <asm/mach-au1x00/au1000.h> +/* + * I haven't found anyone that doesn't use a 12 MHz source clock, + * but just in case..... + */ +#define AU1000_SRC_CLK 12000000 + static unsigned int au1x00_clock; /* Hz */ static unsigned long uart_baud_base; +static DEFINE_SPINLOCK(time_lock); + /* * Set the au1000_clock */ @@ -60,3 +70,47 @@ void set_au1x00_uart_baud_base(unsigned long new_baud_base) { uart_baud_base = new_baud_base; } + +/* + * We read the real processor speed from the PLL. This is important + * because it is more accurate than computing it from the 32 KHz + * counter, if it exists. If we don't have an accurate processor + * speed, all of the peripherals that derive their clocks based on + * this advertised speed will introduce error and sometimes not work + * properly. This function is futher convoluted to still allow configurations + * to do that in case they have really, really old silicon with a + * write-only PLL register. -- Dan + */ +unsigned long au1xxx_calc_clock(void) +{ + unsigned long cpu_speed; + unsigned long flags; + + spin_lock_irqsave(&time_lock, flags); + + /* + * On early Au1000, sys_cpupll was write-only. Since these + * silicon versions of Au1000 are not sold by AMD, we don't bend + * over backwards trying to determine the frequency. + */ + if (au1xxx_cpu_has_pll_wo()) +#ifdef CONFIG_SOC_AU1000_FREQUENCY + cpu_speed = CONFIG_SOC_AU1000_FREQUENCY; +#else + cpu_speed = 396000000; +#endif + else + cpu_speed = (au_readl(SYS_CPUPLL) & 0x0000003f) * AU1000_SRC_CLK; + + /* On Alchemy CPU:counter ratio is 1:1 */ + mips_hpt_frequency = cpu_speed; + /* Equation: Baudrate = CPU / (SD * 2 * CLKDIV * 16) */ + set_au1x00_uart_baud_base(cpu_speed / (2 * ((int)(au_readl(SYS_POWERCTRL) + & 0x03) + 2) * 16)); + + spin_unlock_irqrestore(&time_lock, flags); + + set_au1x00_speed(cpu_speed); + + return cpu_speed; +} diff --git a/arch/mips/alchemy/common/setup.c b/arch/mips/alchemy/common/setup.c index 8ad453af2c64..3f036b3d400e 100644 --- a/arch/mips/alchemy/common/setup.c +++ b/arch/mips/alchemy/common/setup.c @@ -44,6 +44,15 @@ extern void set_cpuspec(void); void __init plat_mem_setup(void) { + unsigned long est_freq; + + /* determine core clock */ + est_freq = au1xxx_calc_clock(); + est_freq += 5000; /* round */ + est_freq -= est_freq % 10000; + printk(KERN_INFO "(PRId %08x) @ %lu.%02lu MHz\n", read_c0_prid(), + est_freq / 1000000, ((est_freq % 1000000) * 100) / 1000000); + _machine_restart = au1000_restart; _machine_halt = au1000_halt; pm_power_off = au1000_power_off; diff --git a/arch/mips/alchemy/common/time.c b/arch/mips/alchemy/common/time.c index 57f0aec590b8..32880146cbc1 100644 --- a/arch/mips/alchemy/common/time.c +++ b/arch/mips/alchemy/common/time.c @@ -44,53 +44,6 @@ extern int allow_au1k_wait; /* default off for CP0 Counter */ -static DEFINE_SPINLOCK(time_lock); - -/* - * I haven't found anyone that doesn't use a 12 MHz source clock, - * but just in case..... - */ -#define AU1000_SRC_CLK 12000000 - -/* - * We read the real processor speed from the PLL. This is important - * because it is more accurate than computing it from the 32 KHz - * counter, if it exists. If we don't have an accurate processor - * speed, all of the peripherals that derive their clocks based on - * this advertised speed will introduce error and sometimes not work - * properly. This function is futher convoluted to still allow configurations - * to do that in case they have really, really old silicon with a - * write-only PLL register. -- Dan - */ -unsigned long calc_clock(void) -{ - unsigned long cpu_speed; - unsigned long flags; - - spin_lock_irqsave(&time_lock, flags); - - /* - * On early Au1000, sys_cpupll was write-only. Since these - * silicon versions of Au1000 are not sold by AMD, we don't bend - * over backwards trying to determine the frequency. - */ - if (au1xxx_cpu_has_pll_wo()) -#ifdef CONFIG_SOC_AU1000_FREQUENCY - cpu_speed = CONFIG_SOC_AU1000_FREQUENCY; -#else - cpu_speed = 396000000; -#endif - else - cpu_speed = (au_readl(SYS_CPUPLL) & 0x0000003f) * AU1000_SRC_CLK; - /* On Alchemy CPU:counter ratio is 1:1 */ - mips_hpt_frequency = cpu_speed; - /* Equation: Baudrate = CPU / (SD * 2 * CLKDIV * 16) */ - set_au1x00_uart_baud_base(cpu_speed / (2 * ((int)(au_readl(SYS_POWERCTRL) - & 0x03) + 2) * 16)); - spin_unlock_irqrestore(&time_lock, flags); - return cpu_speed; -} - static cycle_t au1x_counter1_read(void) { return au_readl(SYS_RTCREAD); @@ -150,13 +103,6 @@ void __init plat_time_init(void) { struct clock_event_device *cd = &au1x_rtcmatch2_clockdev; unsigned long t; - unsigned int est_freq = calc_clock(); - - est_freq += 5000; /* round */ - est_freq -= est_freq%10000; - printk(KERN_INFO "(PRId %08x) @ %u.%02u MHz\n", read_c0_prid(), - est_freq / 1000000, ((est_freq % 1000000) * 100) / 1000000); - set_au1x00_speed(est_freq); /* Check if firmware (YAMON, ...) has enabled 32kHz and clock * has been detected. If so install the rtcmatch2 clocksource, |