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imx9_clockconfig.c: Add way to query clock frequency

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The frequency of a clock source is stored in a LUT. Currently the
LUT contains the PLL frequencies set by the boot ROM code.
This commit is contained in:
Ville Juven 2024-03-26 10:19:43 +02:00 • committed by Xiang Xiao
parent 6aae7ba0eb
commit f50c439f21
3 changed files with 150 additions and 2 deletions
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4
arch/arm64/src/imx9/hardware/imx93/imx93_ccm.h
View file

@ -579,13 +579,13 @@ enum ccm_clock_name_e
ARM_PLL = 1, /* ARM PLL */
ARM_PLLOUT = 2, /* ARM PLL OUT */
SYS_PLL1_IN = 3, /* SYSTEM PLL1 IN */
SYS_PLL1PFD0_IN = 5, /* SYSTEM PLL1 PFD0 IN */
SYS_PLL1PFD0_IN = 4, /* SYSTEM PLL1 PFD0 IN */
SYS_PLL1PFD0 = 5, /* SYSTEM PLL1 PFD0 */
SYS_PLL1PFD0DIV2 = 6, /* SYSTEM PLL1 PFD0 DIV2 */
SYS_PLL1PFD1_IN = 7, /* SYSTEM PLL1 PFD1 IN */
SYS_PLL1PFD1 = 8, /* SYSTEM PLL1 PFD1 */
SYS_PLL1PFD1DIV2 = 9, /* SYSTEM PLL1 PFD1 DIV2 */
SYS_PLL1PFD2_IN = 11, /* SYSTEM PLL1 PFD2 IN */
SYS_PLL1PFD2_IN = 10, /* SYSTEM PLL1 PFD2 IN */
SYS_PLL1PFD2 = 11, /* SYSTEM PLL1 PFD2 */
SYS_PLL1PFD2DIV2 = 12, /* SYSTEM PLL1 PFD2 DIV2 */
AUDIO_PLL1 = 13, /* AUDIO PLL1 */

104
arch/arm64/src/imx9/imx9_clockconfig.c
View file

@ -58,6 +58,30 @@
* Private Data
****************************************************************************/
static uint32_t g_pll_freqs[] =
{
[OSC_24M] = 24000000U, /* 24MHZ OSCILLATOR. */
[ARM_PLL] = 2000000000U, /* ARM PLL */
[ARM_PLLOUT] = 2000000000U, /* ARM PLL OUT */
[SYS_PLL1_IN] = 4000000000U, /* SYSTEM PLL1 IN */
[SYS_PLL1PFD0_IN] = 1000000000U, /* SYSTEM PLL1 PFD0 IN */
[SYS_PLL1PFD0] = 1000000000U, /* SYSTEM PLL1 PFD0 */
[SYS_PLL1PFD0DIV2] = 500000000U, /* SYSTEM PLL1 PFD0 DIV2 */
[SYS_PLL1PFD1_IN] = 800000000U, /* SYSTEM PLL1 PFD1 IN */
[SYS_PLL1PFD1] = 800000000U, /* SYSTEM PLL1 PFD1 */
[SYS_PLL1PFD1DIV2] = 400000000U, /* SYSTEM PLL1 PFD1 DIV2 */
[SYS_PLL1PFD2_IN] = 625000000U, /* SYSTEM PLL1 PFD2 IN */
[SYS_PLL1PFD2] = 625000000U, /* SYSTEM PLL1 PFD2 */
[SYS_PLL1PFD2DIV2] = 312500000U, /* SYSTEM PLL1 PFD2 DIV2 */
[AUDIO_PLL1] = 0U, /* AUDIO PLL1 */
[AUDIO_PLL1OUT] = 0U, /* AUDIO PLL1 OUT */
[DRAM_PLL] = 1000000000U, /* DRAM PLL */
[DRAM_PLLOUT] = 1000000000U, /* DRAM PLL OUT */
[VIDEO_PLL1] = 0U, /* VIDEO PLL1 */
[VIDEO_PLL1OUT] = 0U, /* VIDEO PLL1 OUT */
[EXT] = 0U /* EXT */
};
/****************************************************************************
* Private Functions
****************************************************************************/
@ -214,3 +238,83 @@ void imx9_clockconfig(void)
* By default, all peripheral root clocks are set to the 24 MHz oscillator.
*/
}
/****************************************************************************
* Name: imx9_get_clock
*
* Description:
* This function returns the clock frequency of the specified functional
* clock.
*
* Input Parameters:
* clkname - Identifies the clock of interest
* frequency - The location where the peripheral clock frequency will be
* returned
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* any failure. -ENODEV is returned if the clock is not enabled or is not
* being clocked.
*
****************************************************************************/
int imx9_get_clock(int clkname, uint32_t *frequency)
{
if (clkname >= EXT)
{
*frequency = 0;
return -ENODEV;
}
*frequency = g_pll_freqs[clkname];
return OK;
}
/****************************************************************************
* Name: imx9_get_rootclock
*
* Description:
* This function returns the clock frequency of the specified root
* functional clock.
*
* Input Parameters:
* clkroot - Identifies the peripheral clock of interest
* frequency - The location where the peripheral clock frequency will be
* returned
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* any failure. -ENODEV is returned if the clock is not enabled or is not
* being clocked.
*
****************************************************************************/
int imx9_get_rootclock(int clkroot, uint32_t *frequency)
{
uint32_t reg;
uint32_t div;
uint32_t mux;
int clk_name;
if (clkroot <= CCM_CR_COUNT)
{
reg = getreg32(IMX9_CCM_CR_CTRL(clkroot));
if ((reg & CCM_CR_CTRL_OFF) == CCM_CR_CTRL_OFF)
{
*frequency = 0;
}
else
{
mux = (reg & CCM_CR_CTRL_MUX_MASK) >> CCM_CR_CTRL_MUX_SHIFT;
clk_name = g_ccm_root_mux[clkroot][mux];
imx9_get_clock(clk_name, frequency);
div = ((reg & CCM_CR_CTRL_DIV_MASK) >> CCM_CR_CTRL_DIV_SHIFT) + 1;
*frequency = *frequency / div;
}
return OK;
}
return -ENODEV;
}

44
arch/arm64/src/imx9/imx9_clockconfig.h
View file

@ -27,6 +27,8 @@
#include <nuttx/config.h>
#include <stdint.h>
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
@ -43,4 +45,46 @@
void imx9_clockconfig(void);
/****************************************************************************
* Name: imx9_get_clock
*
* Description:
* This function returns the clock frequency of the specified functional
* clock.
*
* Input Parameters:
* clkname - Identifies the clock of interest
* frequency - The location where the peripheral clock frequency will be
* returned
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* any failure. -ENODEV is returned if the clock is not enabled or is not
* being clocked.
*
****************************************************************************/
int imx9_get_clock(int clkname, uint32_t *frequency);
/****************************************************************************
* Name: imx9_get_rootclock
*
* Description:
* This function returns the clock frequency of the specified root
* functional clock.
*
* Input Parameters:
* clkroot - Identifies the peripheral clock of interest
* frequency - The location where the peripheral clock frequency will be
* returned
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* any failure. -ENODEV is returned if the clock is not enabled or is not
* being clocked.
*
****************************************************************************/
int imx9_get_rootclock(int clkroot, uint32_t *frequency);
#endif /* __ARCH_ARM64_SRC_IMX9_IMX9_CLOCKCONFIG_H */