u-boot/arch/arm/mach-zynq/clk.c
Simon Glass 30db918768 zynq: Rename struct clk_ops to zynq_clk_ops
Since we want clk_ops to be used in U-Boot as a whole, rename the Zynq
version until it can be converted to driver model.

Signed-off-by: Simon Glass <sjg@chromium.org>
2015-07-21 17:39:29 -06:00

664 lines
18 KiB
C

/*
* Copyright (C) 2013 Soren Brinkmann <soren.brinkmann@xilinx.com>
* Copyright (C) 2013 Xilinx, Inc. All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <errno.h>
#include <clk.h>
#include <asm/io.h>
#include <asm/arch/hardware.h>
#include <asm/arch/clk.h>
/* Board oscillator frequency */
#ifndef CONFIG_ZYNQ_PS_CLK_FREQ
# define CONFIG_ZYNQ_PS_CLK_FREQ 33333333UL
#endif
/* Register bitfield defines */
#define PLLCTRL_FBDIV_MASK 0x7f000
#define PLLCTRL_FBDIV_SHIFT 12
#define PLLCTRL_BPFORCE_MASK (1 << 4)
#define PLLCTRL_PWRDWN_MASK 2
#define PLLCTRL_PWRDWN_SHIFT 1
#define PLLCTRL_RESET_MASK 1
#define PLLCTRL_RESET_SHIFT 0
#define ZYNQ_CLK_MAXDIV 0x3f
#define CLK_CTRL_DIV1_SHIFT 20
#define CLK_CTRL_DIV1_MASK (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV1_SHIFT)
#define CLK_CTRL_DIV0_SHIFT 8
#define CLK_CTRL_DIV0_MASK (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV0_SHIFT)
#define CLK_CTRL_SRCSEL_SHIFT 4
#define CLK_CTRL_SRCSEL_MASK (0x3 << CLK_CTRL_SRCSEL_SHIFT)
#define CLK_CTRL_DIV2X_SHIFT 26
#define CLK_CTRL_DIV2X_MASK (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV2X_SHIFT)
#define CLK_CTRL_DIV3X_SHIFT 20
#define CLK_CTRL_DIV3X_MASK (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV3X_SHIFT)
#define ZYNQ_CLKMUX_SEL_0 0
#define ZYNQ_CLKMUX_SEL_1 1
#define ZYNQ_CLKMUX_SEL_2 2
#define ZYNQ_CLKMUX_SEL_3 3
DECLARE_GLOBAL_DATA_PTR;
struct clk;
/**
* struct zynq_clk_ops:
* @set_rate: Function pointer to set_rate() implementation
* @get_rate: Function pointer to get_rate() implementation
*/
struct zynq_clk_ops {
int (*set_rate)(struct clk *clk, unsigned long rate);
unsigned long (*get_rate)(struct clk *clk);
};
/**
* struct clk:
* @name: Clock name
* @frequency: Currenct frequency
* @parent: Parent clock
* @flags: Clock flags
* @reg: Clock control register
* @ops: Clock operations
*/
struct clk {
char *name;
unsigned long frequency;
enum zynq_clk parent;
unsigned int flags;
u32 *reg;
struct zynq_clk_ops ops;
};
#define ZYNQ_CLK_FLAGS_HAS_2_DIVS 1
static struct clk clks[clk_max];
/**
* __zynq_clk_cpu_get_parent() - Decode clock multiplexer
* @srcsel: Mux select value
* Returns the clock identifier associated with the selected mux input.
*/
static int __zynq_clk_cpu_get_parent(unsigned int srcsel)
{
unsigned int ret;
switch (srcsel) {
case ZYNQ_CLKMUX_SEL_0:
case ZYNQ_CLKMUX_SEL_1:
ret = armpll_clk;
break;
case ZYNQ_CLKMUX_SEL_2:
ret = ddrpll_clk;
break;
case ZYNQ_CLKMUX_SEL_3:
ret = iopll_clk;
break;
default:
ret = armpll_clk;
break;
}
return ret;
}
/**
* ddr2x_get_rate() - Get clock rate of DDR2x clock
* @clk: Clock handle
* Returns the current clock rate of @clk.
*/
static unsigned long ddr2x_get_rate(struct clk *clk)
{
u32 clk_ctrl = readl(clk->reg);
u32 div = (clk_ctrl & CLK_CTRL_DIV2X_MASK) >> CLK_CTRL_DIV2X_SHIFT;
return DIV_ROUND_CLOSEST(zynq_clk_get_rate(clk->parent), div);
}
/**
* ddr3x_get_rate() - Get clock rate of DDR3x clock
* @clk: Clock handle
* Returns the current clock rate of @clk.
*/
static unsigned long ddr3x_get_rate(struct clk *clk)
{
u32 clk_ctrl = readl(clk->reg);
u32 div = (clk_ctrl & CLK_CTRL_DIV3X_MASK) >> CLK_CTRL_DIV3X_SHIFT;
return DIV_ROUND_CLOSEST(zynq_clk_get_rate(clk->parent), div);
}
static void init_ddr_clocks(void)
{
u32 div0, div1;
unsigned long prate = zynq_clk_get_rate(ddrpll_clk);
u32 clk_ctrl = readl(&slcr_base->ddr_clk_ctrl);
/* DDR2x */
clks[ddr2x_clk].reg = &slcr_base->ddr_clk_ctrl;
clks[ddr2x_clk].parent = ddrpll_clk;
clks[ddr2x_clk].name = "ddr_2x";
clks[ddr2x_clk].frequency = ddr2x_get_rate(&clks[ddr2x_clk]);
clks[ddr2x_clk].ops.get_rate = ddr2x_get_rate;
/* DDR3x */
clks[ddr3x_clk].reg = &slcr_base->ddr_clk_ctrl;
clks[ddr3x_clk].parent = ddrpll_clk;
clks[ddr3x_clk].name = "ddr_3x";
clks[ddr3x_clk].frequency = ddr3x_get_rate(&clks[ddr3x_clk]);
clks[ddr3x_clk].ops.get_rate = ddr3x_get_rate;
/* DCI */
clk_ctrl = readl(&slcr_base->dci_clk_ctrl);
div0 = (clk_ctrl & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
div1 = (clk_ctrl & CLK_CTRL_DIV1_MASK) >> CLK_CTRL_DIV1_SHIFT;
clks[dci_clk].reg = &slcr_base->dci_clk_ctrl;
clks[dci_clk].parent = ddrpll_clk;
clks[dci_clk].frequency = DIV_ROUND_CLOSEST(
DIV_ROUND_CLOSEST(prate, div0), div1);
clks[dci_clk].name = "dci";
gd->bd->bi_ddr_freq = clks[ddr3x_clk].frequency / 1000000;
}
static void init_cpu_clocks(void)
{
int clk_621;
u32 reg, div, srcsel;
enum zynq_clk parent;
reg = readl(&slcr_base->arm_clk_ctrl);
clk_621 = readl(&slcr_base->clk_621_true) & 1;
div = (reg & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
srcsel = (reg & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;
parent = __zynq_clk_cpu_get_parent(srcsel);
/* cpu clocks */
clks[cpu_6or4x_clk].reg = &slcr_base->arm_clk_ctrl;
clks[cpu_6or4x_clk].parent = parent;
clks[cpu_6or4x_clk].frequency = DIV_ROUND_CLOSEST(
zynq_clk_get_rate(parent), div);
clks[cpu_6or4x_clk].name = "cpu_6or4x";
clks[cpu_3or2x_clk].reg = &slcr_base->arm_clk_ctrl;
clks[cpu_3or2x_clk].parent = cpu_6or4x_clk;
clks[cpu_3or2x_clk].frequency = zynq_clk_get_rate(cpu_6or4x_clk) / 2;
clks[cpu_3or2x_clk].name = "cpu_3or2x";
clks[cpu_2x_clk].reg = &slcr_base->arm_clk_ctrl;
clks[cpu_2x_clk].parent = cpu_6or4x_clk;
clks[cpu_2x_clk].frequency = zynq_clk_get_rate(cpu_6or4x_clk) /
(2 + clk_621);
clks[cpu_2x_clk].name = "cpu_2x";
clks[cpu_1x_clk].reg = &slcr_base->arm_clk_ctrl;
clks[cpu_1x_clk].parent = cpu_6or4x_clk;
clks[cpu_1x_clk].frequency = zynq_clk_get_rate(cpu_6or4x_clk) /
(4 + 2 * clk_621);
clks[cpu_1x_clk].name = "cpu_1x";
}
/**
* periph_calc_two_divs() - Calculate clock dividers
* @cur_rate: Current clock rate
* @tgt_rate: Target clock rate
* @prate: Parent clock rate
* @div0: First divider (output)
* @div1: Second divider (output)
* Returns the actual clock rate possible.
*
* Calculates clock dividers for clocks with two 6-bit dividers.
*/
static unsigned long periph_calc_two_divs(unsigned long cur_rate,
unsigned long tgt_rate, unsigned long prate, u32 *div0,
u32 *div1)
{
long err, best_err = (long)(~0UL >> 1);
unsigned long rate, best_rate = 0;
u32 d0, d1;
for (d0 = 1; d0 <= ZYNQ_CLK_MAXDIV; d0++) {
for (d1 = 1; d1 <= ZYNQ_CLK_MAXDIV >> 1; d1++) {
rate = DIV_ROUND_CLOSEST(DIV_ROUND_CLOSEST(prate, d0),
d1);
err = abs(rate - tgt_rate);
if (err < best_err) {
*div0 = d0;
*div1 = d1;
best_err = err;
best_rate = rate;
}
}
}
return best_rate;
}
/**
* zynq_clk_periph_set_rate() - Set clock rate
* @clk: Handle of the peripheral clock
* @rate: New clock rate
* Sets the clock frequency of @clk to @rate. Returns zero on success.
*/
static int zynq_clk_periph_set_rate(struct clk *clk,
unsigned long rate)
{
u32 ctrl, div0 = 0, div1 = 0;
unsigned long prate, new_rate, cur_rate = clk->frequency;
ctrl = readl(clk->reg);
prate = zynq_clk_get_rate(clk->parent);
ctrl &= ~CLK_CTRL_DIV0_MASK;
if (clk->flags & ZYNQ_CLK_FLAGS_HAS_2_DIVS) {
ctrl &= ~CLK_CTRL_DIV1_MASK;
new_rate = periph_calc_two_divs(cur_rate, rate, prate, &div0,
&div1);
ctrl |= div1 << CLK_CTRL_DIV1_SHIFT;
} else {
div0 = DIV_ROUND_CLOSEST(prate, rate);
div0 &= ZYNQ_CLK_MAXDIV;
new_rate = DIV_ROUND_CLOSEST(rate, div0);
}
/* write new divs to hardware */
ctrl |= div0 << CLK_CTRL_DIV0_SHIFT;
writel(ctrl, clk->reg);
/* update frequency in clk framework */
clk->frequency = new_rate;
return 0;
}
/**
* zynq_clk_periph_get_rate() - Get clock rate
* @clk: Handle of the peripheral clock
* Returns the current clock rate of @clk.
*/
static unsigned long zynq_clk_periph_get_rate(struct clk *clk)
{
u32 clk_ctrl = readl(clk->reg);
u32 div0 = (clk_ctrl & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
u32 div1 = 1;
if (clk->flags & ZYNQ_CLK_FLAGS_HAS_2_DIVS)
div1 = (clk_ctrl & CLK_CTRL_DIV1_MASK) >> CLK_CTRL_DIV1_SHIFT;
/* a register value of zero == division by 1 */
if (!div0)
div0 = 1;
if (!div1)
div1 = 1;
return
DIV_ROUND_CLOSEST(
DIV_ROUND_CLOSEST(zynq_clk_get_rate(clk->parent), div0),
div1);
}
/**
* __zynq_clk_periph_get_parent() - Decode clock multiplexer
* @srcsel: Mux select value
* Returns the clock identifier associated with the selected mux input.
*/
static enum zynq_clk __zynq_clk_periph_get_parent(u32 srcsel)
{
switch (srcsel) {
case ZYNQ_CLKMUX_SEL_0:
case ZYNQ_CLKMUX_SEL_1:
return iopll_clk;
case ZYNQ_CLKMUX_SEL_2:
return armpll_clk;
case ZYNQ_CLKMUX_SEL_3:
return ddrpll_clk;
default:
return 0;
}
}
/**
* zynq_clk_periph_get_parent() - Decode clock multiplexer
* @clk: Clock handle
* Returns the clock identifier associated with the selected mux input.
*/
static enum zynq_clk zynq_clk_periph_get_parent(struct clk *clk)
{
u32 clk_ctrl = readl(clk->reg);
u32 srcsel = (clk_ctrl & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;
return __zynq_clk_periph_get_parent(srcsel);
}
/**
* zynq_clk_register_periph_clk() - Set up a peripheral clock with the framework
* @clk: Pointer to struct clk for the clock
* @ctrl: Clock control register
* @name: PLL name
* @two_divs: Indicates whether the clock features one or two dividers
*/
static int zynq_clk_register_periph_clk(struct clk *clk, u32 *ctrl, char *name,
bool two_divs)
{
clk->name = name;
clk->reg = ctrl;
if (two_divs)
clk->flags = ZYNQ_CLK_FLAGS_HAS_2_DIVS;
clk->parent = zynq_clk_periph_get_parent(clk);
clk->frequency = zynq_clk_periph_get_rate(clk);
clk->ops.get_rate = zynq_clk_periph_get_rate;
clk->ops.set_rate = zynq_clk_periph_set_rate;
return 0;
}
static void init_periph_clocks(void)
{
zynq_clk_register_periph_clk(&clks[gem0_clk], &slcr_base->gem0_clk_ctrl,
"gem0", 1);
zynq_clk_register_periph_clk(&clks[gem1_clk], &slcr_base->gem1_clk_ctrl,
"gem1", 1);
zynq_clk_register_periph_clk(&clks[smc_clk], &slcr_base->smc_clk_ctrl,
"smc", 0);
zynq_clk_register_periph_clk(&clks[lqspi_clk],
&slcr_base->lqspi_clk_ctrl, "lqspi", 0);
zynq_clk_register_periph_clk(&clks[sdio0_clk],
&slcr_base->sdio_clk_ctrl, "sdio0", 0);
zynq_clk_register_periph_clk(&clks[sdio1_clk],
&slcr_base->sdio_clk_ctrl, "sdio1", 0);
zynq_clk_register_periph_clk(&clks[spi0_clk], &slcr_base->spi_clk_ctrl,
"spi0", 0);
zynq_clk_register_periph_clk(&clks[spi1_clk], &slcr_base->spi_clk_ctrl,
"spi1", 0);
zynq_clk_register_periph_clk(&clks[uart0_clk],
&slcr_base->uart_clk_ctrl, "uart0", 0);
zynq_clk_register_periph_clk(&clks[uart1_clk],
&slcr_base->uart_clk_ctrl, "uart1", 0);
zynq_clk_register_periph_clk(&clks[dbg_trc_clk],
&slcr_base->dbg_clk_ctrl, "dbg_trc", 0);
zynq_clk_register_periph_clk(&clks[dbg_apb_clk],
&slcr_base->dbg_clk_ctrl, "dbg_apb", 0);
zynq_clk_register_periph_clk(&clks[pcap_clk],
&slcr_base->pcap_clk_ctrl, "pcap", 0);
zynq_clk_register_periph_clk(&clks[fclk0_clk],
&slcr_base->fpga0_clk_ctrl, "fclk0", 1);
zynq_clk_register_periph_clk(&clks[fclk1_clk],
&slcr_base->fpga1_clk_ctrl, "fclk1", 1);
zynq_clk_register_periph_clk(&clks[fclk2_clk],
&slcr_base->fpga2_clk_ctrl, "fclk2", 1);
zynq_clk_register_periph_clk(&clks[fclk3_clk],
&slcr_base->fpga3_clk_ctrl, "fclk3", 1);
}
/**
* zynq_clk_register_aper_clk() - Set up a APER clock with the framework
* @clk: Pointer to struct clk for the clock
* @ctrl: Clock control register
* @name: PLL name
*/
static void zynq_clk_register_aper_clk(struct clk *clk, u32 *ctrl, char *name)
{
clk->name = name;
clk->reg = ctrl;
clk->parent = cpu_1x_clk;
clk->frequency = zynq_clk_get_rate(clk->parent);
}
static void init_aper_clocks(void)
{
zynq_clk_register_aper_clk(&clks[usb0_aper_clk],
&slcr_base->aper_clk_ctrl, "usb0_aper");
zynq_clk_register_aper_clk(&clks[usb1_aper_clk],
&slcr_base->aper_clk_ctrl, "usb1_aper");
zynq_clk_register_aper_clk(&clks[gem0_aper_clk],
&slcr_base->aper_clk_ctrl, "gem0_aper");
zynq_clk_register_aper_clk(&clks[gem1_aper_clk],
&slcr_base->aper_clk_ctrl, "gem1_aper");
zynq_clk_register_aper_clk(&clks[sdio0_aper_clk],
&slcr_base->aper_clk_ctrl, "sdio0_aper");
zynq_clk_register_aper_clk(&clks[sdio1_aper_clk],
&slcr_base->aper_clk_ctrl, "sdio1_aper");
zynq_clk_register_aper_clk(&clks[spi0_aper_clk],
&slcr_base->aper_clk_ctrl, "spi0_aper");
zynq_clk_register_aper_clk(&clks[spi1_aper_clk],
&slcr_base->aper_clk_ctrl, "spi1_aper");
zynq_clk_register_aper_clk(&clks[can0_aper_clk],
&slcr_base->aper_clk_ctrl, "can0_aper");
zynq_clk_register_aper_clk(&clks[can1_aper_clk],
&slcr_base->aper_clk_ctrl, "can1_aper");
zynq_clk_register_aper_clk(&clks[i2c0_aper_clk],
&slcr_base->aper_clk_ctrl, "i2c0_aper");
zynq_clk_register_aper_clk(&clks[i2c1_aper_clk],
&slcr_base->aper_clk_ctrl, "i2c1_aper");
zynq_clk_register_aper_clk(&clks[uart0_aper_clk],
&slcr_base->aper_clk_ctrl, "uart0_aper");
zynq_clk_register_aper_clk(&clks[uart1_aper_clk],
&slcr_base->aper_clk_ctrl, "uart1_aper");
zynq_clk_register_aper_clk(&clks[gpio_aper_clk],
&slcr_base->aper_clk_ctrl, "gpio_aper");
zynq_clk_register_aper_clk(&clks[lqspi_aper_clk],
&slcr_base->aper_clk_ctrl, "lqspi_aper");
zynq_clk_register_aper_clk(&clks[smc_aper_clk],
&slcr_base->aper_clk_ctrl, "smc_aper");
}
/**
* __zynq_clk_pll_get_rate() - Get PLL rate
* @addr: Address of the PLL's control register
* Returns the current PLL output rate.
*/
static unsigned long __zynq_clk_pll_get_rate(u32 *addr)
{
u32 reg, mul, bypass;
reg = readl(addr);
bypass = reg & PLLCTRL_BPFORCE_MASK;
if (bypass)
mul = 1;
else
mul = (reg & PLLCTRL_FBDIV_MASK) >> PLLCTRL_FBDIV_SHIFT;
return CONFIG_ZYNQ_PS_CLK_FREQ * mul;
}
/**
* zynq_clk_pll_get_rate() - Get PLL rate
* @pll: Handle of the PLL
* Returns the current clock rate of @pll.
*/
static unsigned long zynq_clk_pll_get_rate(struct clk *pll)
{
return __zynq_clk_pll_get_rate(pll->reg);
}
/**
* zynq_clk_register_pll() - Set up a PLL with the framework
* @clk: Pointer to struct clk for the PLL
* @ctrl: PLL control register
* @name: PLL name
* @prate: PLL input clock rate
*/
static void zynq_clk_register_pll(struct clk *clk, u32 *ctrl, char *name,
unsigned long prate)
{
clk->name = name;
clk->reg = ctrl;
clk->frequency = zynq_clk_pll_get_rate(clk);
clk->ops.get_rate = zynq_clk_pll_get_rate;
}
/**
* clkid_2_register() - Get clock control register
* @id: Clock identifier of one of the PLLs
* Returns the address of the requested PLL's control register.
*/
static u32 *clkid_2_register(enum zynq_clk id)
{
switch (id) {
case armpll_clk:
return &slcr_base->arm_pll_ctrl;
case ddrpll_clk:
return &slcr_base->ddr_pll_ctrl;
case iopll_clk:
return &slcr_base->io_pll_ctrl;
default:
return &slcr_base->io_pll_ctrl;
}
}
/* API */
/**
* zynq_clk_early_init() - Early init for the clock framework
*
* This function is called from before relocation and sets up the CPU clock
* frequency in the global data struct.
*/
void zynq_clk_early_init(void)
{
u32 reg = readl(&slcr_base->arm_clk_ctrl);
u32 div = (reg & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
u32 srcsel = (reg & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;
enum zynq_clk parent = __zynq_clk_cpu_get_parent(srcsel);
u32 *pllreg = clkid_2_register(parent);
unsigned long prate = __zynq_clk_pll_get_rate(pllreg);
if (!div)
div = 1;
gd->cpu_clk = DIV_ROUND_CLOSEST(prate, div);
}
/**
* get_uart_clk() - Get UART input frequency
* @dev_index: UART ID
* Returns UART input clock frequency in Hz.
*
* Compared to zynq_clk_get_rate() this function is designed to work before
* relocation and can be called when the serial UART is set up.
*/
unsigned long get_uart_clk(int dev_index)
{
u32 reg = readl(&slcr_base->uart_clk_ctrl);
u32 div = (reg & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
u32 srcsel = (reg & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;
enum zynq_clk parent = __zynq_clk_periph_get_parent(srcsel);
u32 *pllreg = clkid_2_register(parent);
unsigned long prate = __zynq_clk_pll_get_rate(pllreg);
if (!div)
div = 1;
return DIV_ROUND_CLOSEST(prate, div);
}
/**
* set_cpu_clk_info() - Initialize clock framework
* Always returns zero.
*
* This function is called from common code after relocation and sets up the
* clock framework. The framework must not be used before this function had been
* called.
*/
int set_cpu_clk_info(void)
{
zynq_clk_register_pll(&clks[armpll_clk], &slcr_base->arm_pll_ctrl,
"armpll", CONFIG_ZYNQ_PS_CLK_FREQ);
zynq_clk_register_pll(&clks[ddrpll_clk], &slcr_base->ddr_pll_ctrl,
"ddrpll", CONFIG_ZYNQ_PS_CLK_FREQ);
zynq_clk_register_pll(&clks[iopll_clk], &slcr_base->io_pll_ctrl,
"iopll", CONFIG_ZYNQ_PS_CLK_FREQ);
init_ddr_clocks();
init_cpu_clocks();
init_periph_clocks();
init_aper_clocks();
gd->bd->bi_arm_freq = gd->cpu_clk / 1000000;
gd->bd->bi_dsp_freq = 0;
return 0;
}
/**
* zynq_clk_get_rate() - Get clock rate
* @clk: Clock identifier
* Returns the current clock rate of @clk on success or zero for an invalid
* clock id.
*/
unsigned long zynq_clk_get_rate(enum zynq_clk clk)
{
if (clk < 0 || clk >= clk_max)
return 0;
return clks[clk].frequency;
}
/**
* zynq_clk_set_rate() - Set clock rate
* @clk: Clock identifier
* @rate: Requested clock rate
* Passes on the return value from the clock's set_rate() function or negative
* errno.
*/
int zynq_clk_set_rate(enum zynq_clk clk, unsigned long rate)
{
if (clk < 0 || clk >= clk_max)
return -ENODEV;
if (clks[clk].ops.set_rate)
return clks[clk].ops.set_rate(&clks[clk], rate);
return -ENXIO;
}
/**
* zynq_clk_get_name() - Get clock name
* @clk: Clock identifier
* Returns the name of @clk.
*/
const char *zynq_clk_get_name(enum zynq_clk clk)
{
return clks[clk].name;
}
/**
* soc_clk_dump() - Print clock frequencies
* Returns zero on success
*
* Implementation for the clk dump command.
*/
int soc_clk_dump(void)
{
int i;
printf("clk\t\tfrequency\n");
for (i = 0; i < clk_max; i++) {
const char *name = zynq_clk_get_name(i);
if (name)
printf("%10s%20lu\n", name, zynq_clk_get_rate(i));
}
return 0;
}