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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-04-19 06:35:52 +0200 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-04-20 09:57:01 +0200 |
commit | 7632906fc290b652416ab59eb5fb49356c064ed6 (patch) | |
tree | ac036b1f95637e044e10138ceea8d2b56d80ec97 /bsps/arm/csb336 | |
parent | bsps: Move bspsmpgetcurrentprocessor.c to bsps (diff) | |
download | rtems-7632906fc290b652416ab59eb5fb49356c064ed6.tar.bz2 |
bsps: Move clock drivers to bsps
This patch is a part of the BSP source reorganization.
Update #3285.
Diffstat (limited to 'bsps/arm/csb336')
-rw-r--r-- | bsps/arm/csb336/clock/clockdrv.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/bsps/arm/csb336/clock/clockdrv.c b/bsps/arm/csb336/clock/clockdrv.c new file mode 100644 index 0000000000..ec566154e1 --- /dev/null +++ b/bsps/arm/csb336/clock/clockdrv.c @@ -0,0 +1,134 @@ +/* + * MC9328MXL clock specific using the System Timer + */ + +/* + * Copyright (c) 2004 by Cogent Computer Systems + * Written by Jay Monkman <jtm@lopingdog.com> + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +#include <rtems.h> +#include <bsp.h> +#include <bsp/irq.h> +#include <mc9328mxl.h> +#include <rtems/bspIo.h> /* for printk */ + +/* this is defined in ../../../shared/dev/clock/clockimpl.h */ +void Clock_isr(rtems_irq_hdl_param arg); +static void clock_isr_on(const rtems_irq_connect_data *unused); +static void clock_isr_off(const rtems_irq_connect_data *unused); +static int clock_isr_is_on(const rtems_irq_connect_data *irq); + +/* Replace the first value with the clock's interrupt name. */ +rtems_irq_connect_data clock_isr_data = { + .name = BSP_INT_TIMER1, + .hdl = Clock_isr, + .handle = (void *)BSP_INT_TIMER1, + .on = clock_isr_on, + .off = clock_isr_off, + .isOn = clock_isr_is_on, +}; + +/** + * When we get the clock interrupt + * - clear the interrupt bit? + * - restart the timer? + */ +#define Clock_driver_support_at_tick() \ + do { \ + uint32_t reg; \ + \ + reg = MC9328MXL_TMR1_TSTAT; \ + (void) reg; /* avoid set but not used warning */ \ + MC9328MXL_TMR1_TSTAT = 0; \ + } while(0) + +/** + * Installs the clock ISR. You shouldn't need to change this. + */ +#define Clock_driver_support_install_isr( _new ) \ + BSP_install_rtems_irq_handler(&clock_isr_data) + +/** + * Initialize the hardware for the clock + * - Set the frequency + * - enable it + * - clear any pending interrupts + * + * Since you may want the clock always running, you can + * enable interrupts here. If you do so, the clock_isr_on(), + * clock_isr_off(), and clock_isr_is_on() functions can be + * NOPs. + */ +#define Clock_driver_support_initialize_hardware() \ + do { \ + int freq; \ + int cnt; \ + freq = get_perclk1_freq(); \ + printk("perclk1 freq is %d\n", freq); \ + cnt = ((long long)freq * rtems_configuration_get_microseconds_per_tick() + 500000) / 1000000;\ + printk("cnt freq is %d\n", cnt); \ + MC9328MXL_TMR1_TCMP = cnt; \ + /* use PERCLK1 as input, enable timer */ \ + MC9328MXL_TMR1_TCTL = (MC9328MXL_TMR_TCTL_CLKSRC_PCLK1 | \ + MC9328MXL_TMR_TCTL_TEN | \ + MC9328MXL_TMR_TCTL_IRQEN); \ + /* set prescaler to 1 (register value + 1) */ \ + MC9328MXL_TMR1_TPRER = 0; \ + } while (0) + +/** + * Do whatever you need to shut the clock down and remove the + * interrupt handler. Since this normally only gets called on + * RTEMS shutdown, you may not need to do anything other than + * remove the ISR. + */ +#define Clock_driver_support_shutdown_hardware() \ + do { \ + /* Disable timer */ \ + MC9328MXL_TMR1_TCTL = 0; \ + BSP_remove_rtems_irq_handler(&clock_isr_data); \ + } while (0) + +/** + * Enables clock interrupt. + * + * If the interrupt is always on, this can be a NOP. + */ +static void clock_isr_on(const rtems_irq_connect_data *unused) +{ + MC9328MXL_TMR1_TCTL |= MC9328MXL_TMR_TCTL_IRQEN; + MC9328MXL_AITC_INTENNUM = MC9328MXL_INT_TIMER1; +} + +/** + * Disables clock interrupts + * + * If the interrupt is always on, this can be a NOP. + */ +static void clock_isr_off(const rtems_irq_connect_data *unused) +{ + MC9328MXL_TMR1_TCTL &= ~MC9328MXL_TMR_TCTL_IRQEN; + MC9328MXL_AITC_INTDISNUM = MC9328MXL_INT_TIMER1; +} + +/** + * Tests to see if clock interrupt is enabled, and returns 1 if so. + * If interrupt is not enabled, returns 0. + * + * If the interrupt is always on, this always returns 1. + */ +static int clock_isr_is_on(const rtems_irq_connect_data *irq) +{ + return MC9328MXL_TMR1_TCTL & MC9328MXL_TMR_TCTL_IRQEN; +} + +#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER + +/* Make sure to include this, and only at the end of the file */ + +#include "../../../shared/dev/clock/clockimpl.h" |