diff options
Diffstat (limited to 'arch/arm/cpu/armv7/tegra20/pwm.c')
-rw-r--r-- | arch/arm/cpu/armv7/tegra20/pwm.c | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/arch/arm/cpu/armv7/tegra20/pwm.c b/arch/arm/cpu/armv7/tegra20/pwm.c deleted file mode 100644 index 5b88636..0000000 --- a/arch/arm/cpu/armv7/tegra20/pwm.c +++ /dev/null @@ -1,86 +0,0 @@ -/* - * Tegra2 pulse width frequency modulator definitions - * - * Copyright (c) 2011 The Chromium OS Authors. - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#include <common.h> -#include <fdtdec.h> -#include <asm/io.h> -#include <asm/arch/clock.h> -#include <asm/arch/pwm.h> - -struct pwm_info { - struct pwm_ctlr *pwm; /* Registers for our pwm controller */ - int pwm_node; /* PWM device tree node */ -} local; - -void pwm_enable(unsigned channel, int rate, int pulse_width, int freq_divider) -{ - u32 reg; - - assert(channel < PWM_NUM_CHANNELS); - - /* TODO: Can we use clock_adjust_periph_pll_div() here? */ - clock_start_periph_pll(PERIPH_ID_PWM, CLOCK_ID_SFROM32KHZ, rate); - - reg = PWM_ENABLE_MASK; - reg |= pulse_width << PWM_WIDTH_SHIFT; - reg |= freq_divider << PWM_DIVIDER_SHIFT; - writel(reg, &local.pwm[channel].control); - debug("%s: channel=%d, rate=%d\n", __func__, channel, rate); -} - -int pwm_request(const void *blob, int node, const char *prop_name) -{ - int pwm_node; - u32 data[3]; - - if (fdtdec_get_int_array(blob, node, prop_name, data, - ARRAY_SIZE(data))) { - debug("%s: Cannot decode PWM property '%s'\n", __func__, - prop_name); - return -1; - } - - pwm_node = fdt_node_offset_by_phandle(blob, data[0]); - if (pwm_node != local.pwm_node) { - debug("%s: PWM property '%s' phandle %d not recognised" - "- expecting %d\n", __func__, prop_name, data[0], - local.pwm_node); - return -1; - } - if (data[1] >= PWM_NUM_CHANNELS) { - debug("%s: PWM property '%s': invalid channel %u\n", __func__, - prop_name, data[1]); - return -1; - } - - /* - * TODO: We could maintain a list of requests, but it might not be - * worth it for U-Boot. - */ - return data[1]; -} - -int pwm_init(const void *blob) -{ - local.pwm_node = fdtdec_next_compatible(blob, 0, - COMPAT_NVIDIA_TEGRA20_PWM); - if (local.pwm_node < 0) { - debug("%s: Cannot find device tree node\n", __func__); - return -1; - } - - local.pwm = (struct pwm_ctlr *)fdtdec_get_addr(blob, local.pwm_node, - "reg"); - if (local.pwm == (struct pwm_ctlr *)FDT_ADDR_T_NONE) { - debug("%s: Cannot find pwm reg address\n", __func__); - return -1; - } - debug("Tegra PWM at %p, node %d\n", local.pwm, local.pwm_node); - - return 0; -} |