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80 lines
1.7 KiB
80 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* (C) Copyright 2014 |
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* Heiko Schocher, DENX Software Engineering, [email protected]. |
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* |
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* Basic support for the pwm module on imx6. |
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* |
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* Based on linux:drivers/pwm/pwm-imx.c |
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* from |
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* Sascha Hauer <[email protected]> |
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*/ |
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#include <common.h> |
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#include <div64.h> |
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#include <asm/arch/imx-regs.h> |
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/* pwm_id from 0..7 */ |
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struct pwm_regs *pwm_id_to_reg(int pwm_id) |
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{ |
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switch (pwm_id) { |
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case 0: |
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return (struct pwm_regs *)PWM1_BASE_ADDR; |
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case 1: |
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return (struct pwm_regs *)PWM2_BASE_ADDR; |
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#ifdef CONFIG_MX6 |
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case 2: |
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return (struct pwm_regs *)PWM3_BASE_ADDR; |
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case 3: |
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return (struct pwm_regs *)PWM4_BASE_ADDR; |
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#endif |
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#ifdef CONFIG_MX6SX |
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case 4: |
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return (struct pwm_regs *)PWM5_BASE_ADDR; |
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case 5: |
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return (struct pwm_regs *)PWM6_BASE_ADDR; |
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case 6: |
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return (struct pwm_regs *)PWM7_BASE_ADDR; |
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case 7: |
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return (struct pwm_regs *)PWM8_BASE_ADDR; |
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#endif |
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default: |
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printf("unknown pwm_id: %d\n", pwm_id); |
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break; |
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} |
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return NULL; |
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} |
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int pwm_imx_get_parms(int period_ns, int duty_ns, unsigned long *period_c, |
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unsigned long *duty_c, unsigned long *prescale) |
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{ |
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unsigned long long c; |
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/* |
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* we have not yet a clock framework for imx6, so add the clock |
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* value here as a define. Replace it when we have the clock |
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* framework. |
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*/ |
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c = CONFIG_IMX6_PWM_PER_CLK; |
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c = c * period_ns; |
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do_div(c, 1000000000); |
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*period_c = c; |
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*prescale = *period_c / 0x10000 + 1; |
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*period_c /= *prescale; |
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c = *period_c * (unsigned long long)duty_ns; |
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do_div(c, period_ns); |
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*duty_c = c; |
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/* |
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* according to imx pwm RM, the real period value should be |
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* PERIOD value in PWMPR plus 2. |
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*/ |
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if (*period_c > 2) |
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*period_c -= 2; |
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else |
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*period_c = 0; |
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return 0; |
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}
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