/*
- * Freescale i.MX28 clock setup code
+ * Freescale i.MX23/i.MX28 clock setup code
*
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
* on behalf of DENX Software Engineering GmbH
* Based on code from LTIB:
* Copyright (C) 2010 Freescale Semiconductor, Inc.
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/clock.h>
#include <asm/arch/imx-regs.h>
-/* The PLL frequency is always 480MHz, see section 10.2 in iMX28 datasheet. */
+/*
+ * The PLL frequency is 480MHz and XTAL frequency is 24MHz
+ * iMX23: datasheet section 4.2
+ * iMX28: datasheet section 10.2
+ */
#define PLL_FREQ_KHZ 480000
#define PLL_FREQ_COEF 18
-/* The XTAL frequency is always 24MHz, see section 10.2 in iMX28 datasheet. */
#define XTAL_FREQ_KHZ 24000
#define PLL_FREQ_MHZ (PLL_FREQ_KHZ / 1000)
#define XTAL_FREQ_MHZ (XTAL_FREQ_KHZ / 1000)
-static uint32_t mx28_get_pclk(void)
+#if defined(CONFIG_MX23)
+#define MXC_SSPCLK_MAX MXC_SSPCLK0
+#elif defined(CONFIG_MX28)
+#define MXC_SSPCLK_MAX MXC_SSPCLK3
+#endif
+
+static struct mxs_clkctrl_regs *clkctrl_regs = (void *)MXS_CLKCTRL_BASE;
+
+static uint32_t get_frac_clk(uint32_t refclk, uint32_t div, uint32_t _mask)
{
- struct mxs_clkctrl_regs *clkctrl_regs =
- (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
+ uint32_t mask = (_mask + 1) >> 1;
+ uint32_t acc = div;
+ int period = 0;
+ int mult = 0;
+
+ if (div & mask)
+ return 0;
+
+ do {
+ acc += div;
+ if (acc & mask) {
+ acc &= ~mask;
+ mult++;
+ }
+ period++;
+ } while (acc != div);
+ return refclk * mult / period;
+}
+
+static uint32_t mxs_get_pclk(void)
+{
uint32_t clkctrl, clkseq, div;
uint8_t clkfrac, frac;
clkctrl = readl(&clkctrl_regs->hw_clkctrl_cpu);
- /* No support of fractional divider calculation */
+ div = clkctrl & CLKCTRL_CPU_DIV_CPU_MASK;
+ clkfrac = readb(&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_CPU]);
+ frac = clkfrac & CLKCTRL_FRAC_FRAC_MASK;
+ clkseq = readl(&clkctrl_regs->hw_clkctrl_clkseq);
+
if (clkctrl &
(CLKCTRL_CPU_DIV_XTAL_FRAC_EN | CLKCTRL_CPU_DIV_CPU_FRAC_EN)) {
- return 0;
+ uint32_t refclk, mask;
+
+ if (clkseq & CLKCTRL_CLKSEQ_BYPASS_CPU) {
+ refclk = XTAL_FREQ_MHZ;
+ mask = CLKCTRL_CPU_DIV_XTAL_MASK >>
+ CLKCTRL_CPU_DIV_XTAL_OFFSET;
+ div = (clkctrl & CLKCTRL_CPU_DIV_XTAL_MASK) >>
+ CLKCTRL_CPU_DIV_XTAL_OFFSET;
+ } else {
+ refclk = PLL_FREQ_MHZ * PLL_FREQ_COEF / frac;
+ mask = CLKCTRL_CPU_DIV_CPU_MASK;
+ }
+ return get_frac_clk(refclk, div, mask);
}
- clkseq = readl(&clkctrl_regs->hw_clkctrl_clkseq);
-
/* XTAL Path */
if (clkseq & CLKCTRL_CLKSEQ_BYPASS_CPU) {
div = (clkctrl & CLKCTRL_CPU_DIV_XTAL_MASK) >>
}
/* REF Path */
- clkfrac = readb(&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_CPU]);
- frac = clkfrac & CLKCTRL_FRAC_FRAC_MASK;
- div = clkctrl & CLKCTRL_CPU_DIV_CPU_MASK;
return (PLL_FREQ_MHZ * PLL_FREQ_COEF / frac) / div;
}
-static uint32_t mx28_get_hclk(void)
+static uint32_t mxs_get_hclk(void)
{
- struct mxs_clkctrl_regs *clkctrl_regs =
- (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
-
uint32_t div;
uint32_t clkctrl;
+ uint32_t refclk = mxs_get_pclk();
clkctrl = readl(&clkctrl_regs->hw_clkctrl_hbus);
+ div = clkctrl & CLKCTRL_HBUS_DIV_MASK;
- /* No support of fractional divider calculation */
if (clkctrl & CLKCTRL_HBUS_DIV_FRAC_EN)
- return 0;
+ return get_frac_clk(refclk, div, CLKCTRL_HBUS_DIV_MASK);
- div = clkctrl & CLKCTRL_HBUS_DIV_MASK;
- return mx28_get_pclk() / div;
+ return refclk / div;
}
-static uint32_t mx28_get_emiclk(void)
+static uint32_t mxs_get_emiclk(void)
{
- struct mxs_clkctrl_regs *clkctrl_regs =
- (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
-
uint32_t clkctrl, clkseq, div;
uint8_t clkfrac, frac;
return (PLL_FREQ_MHZ * PLL_FREQ_COEF / frac) / div;
}
-static uint32_t mx28_get_gpmiclk(void)
+static uint32_t mxs_get_gpmiclk(void)
{
- struct mxs_clkctrl_regs *clkctrl_regs =
- (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
-
+#if defined(CONFIG_MX23)
+ uint8_t *reg =
+ &clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_CPU];
+#elif defined(CONFIG_MX28)
+ uint8_t *reg =
+ &clkctrl_regs->hw_clkctrl_frac1[CLKCTRL_FRAC1_GPMI];
+#endif
uint32_t clkctrl, clkseq, div;
uint8_t clkfrac, frac;
}
/* REF Path */
- clkfrac = readb(&clkctrl_regs->hw_clkctrl_frac1[CLKCTRL_FRAC1_GPMI]);
+ clkfrac = readb(reg);
frac = clkfrac & CLKCTRL_FRAC_FRAC_MASK;
div = clkctrl & CLKCTRL_GPMI_DIV_MASK;
return (PLL_FREQ_MHZ * PLL_FREQ_COEF / frac) / div;
/*
* Set IO clock frequency, in kHz
*/
-void mx28_set_ioclk(enum mxs_ioclock io, uint32_t freq)
+void mxs_set_ioclk(enum mxs_ioclock io, uint32_t freq)
{
- struct mxs_clkctrl_regs *clkctrl_regs =
- (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
uint32_t div;
int io_reg;
/*
* Get IO clock, returns IO clock in kHz
*/
-static uint32_t mx28_get_ioclk(enum mxs_ioclock io)
+static uint32_t mxs_get_ioclk(enum mxs_ioclock io)
{
- struct mxs_clkctrl_regs *clkctrl_regs =
- (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
uint8_t ret;
int io_reg;
- if ((io < MXC_IOCLK0) || (io > MXC_IOCLK1))
+ if ((io < MXC_IOCLK0) || (io > MXC_IOCLK1)) {
+ printf("%s: IO clock selector %u out of range %u..%u\n",
+ __func__, io, MXC_IOCLK0, MXC_IOCLK1);
return 0;
-
+ }
io_reg = CLKCTRL_FRAC0_IO0 - io; /* Register order is reversed */
ret = readb(&clkctrl_regs->hw_clkctrl_frac0[io_reg]) &
/*
* Configure SSP clock frequency, in kHz
*/
-void mx28_set_sspclk(enum mxs_sspclock ssp, uint32_t freq, int xtal)
+void mxs_set_sspclk(enum mxs_sspclock ssp, uint32_t freq, int xtal)
{
- struct mxs_clkctrl_regs *clkctrl_regs =
- (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
uint32_t clk, clkreg;
- if (ssp > MXC_SSPCLK3)
+ if (ssp > MXC_SSPCLK_MAX)
return;
clkreg = (uint32_t)(&clkctrl_regs->hw_clkctrl_ssp0) +
if (xtal)
clk = XTAL_FREQ_KHZ;
else
- clk = mx28_get_ioclk(ssp >> 1);
+ clk = mxs_get_ioclk(ssp >> 1);
if (freq > clk)
return;
/*
* Return SSP frequency, in kHz
*/
-static uint32_t mx28_get_sspclk(enum mxs_sspclock ssp)
+static uint32_t mxs_get_sspclk(enum mxs_sspclock ssp)
{
- struct mxs_clkctrl_regs *clkctrl_regs =
- (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
- uint32_t clkreg;
+ uint32_t *clkreg;
uint32_t clk, tmp;
- if (ssp > MXC_SSPCLK3)
+ if (ssp > MXC_SSPCLK_MAX)
return 0;
tmp = readl(&clkctrl_regs->hw_clkctrl_clkseq);
if (tmp & (CLKCTRL_CLKSEQ_BYPASS_SSP0 << ssp))
return XTAL_FREQ_KHZ;
- clkreg = (uint32_t)(&clkctrl_regs->hw_clkctrl_ssp0) +
- (ssp * sizeof(struct mxs_register_32));
+ clkreg = &clkctrl_regs->hw_clkctrl_ssp0 +
+ ssp * sizeof(struct mxs_register_32);
tmp = readl(clkreg) & CLKCTRL_SSP_DIV_MASK;
-
if (tmp == 0)
return 0;
- clk = mx28_get_ioclk(ssp >> 1);
+ clk = mxs_get_ioclk(ssp >> 1);
return clk / tmp;
}
/*
* Set SSP/MMC bus frequency, in kHz)
*/
-void mx28_set_ssp_busclock(unsigned int bus, uint32_t freq)
+void mxs_set_ssp_busclock(unsigned int bus, uint32_t freq)
{
struct mxs_ssp_regs *ssp_regs;
- const uint32_t sspclk = mx28_get_sspclk(bus);
+ const enum mxs_sspclock clk = mxs_ssp_clock_by_bus(bus);
+ const uint32_t sspclk = mxs_get_sspclk(clk);
uint32_t reg;
uint32_t divide, rate, tgtclk;
- ssp_regs = (struct mxs_ssp_regs *)(MXS_SSP0_BASE + (bus * 0x2000));
+ ssp_regs = mxs_ssp_regs_by_bus(bus);
/*
* SSP bit rate = SSPCLK / (CLOCK_DIVIDE * (1 + CLOCK_RATE)),
bus, tgtclk, freq);
}
+void mxs_set_lcdclk(uint32_t freq)
+{
+ uint32_t fp, x, k_rest, k_best, x_best, tk;
+ int32_t k_best_l = 999, k_best_t = 0, x_best_l = 0xff, x_best_t = 0xff;
+
+ if (freq == 0)
+ return;
+
+#if defined(CONFIG_MX23)
+ writel(CLKCTRL_CLKSEQ_BYPASS_PIX, &clkctrl_regs->hw_clkctrl_clkseq_clr);
+#elif defined(CONFIG_MX28)
+ writel(CLKCTRL_CLKSEQ_BYPASS_DIS_LCDIF, &clkctrl_regs->hw_clkctrl_clkseq_clr);
+#endif
+
+ /*
+ * / 18 \ 1 1
+ * freq kHz = | 480000000 Hz * -- | * --- * ------
+ * \ x / k 1000
+ *
+ * 480000000 Hz 18
+ * ------------ * --
+ * freq kHz x
+ * k = -------------------
+ * 1000
+ */
+
+ fp = ((PLL_FREQ_KHZ * 1000) / freq) * 18;
+
+ for (x = 18; x <= 35; x++) {
+ tk = fp / x;
+ if ((tk / 1000 == 0) || (tk / 1000 > 255))
+ continue;
+
+ k_rest = tk % 1000;
+
+ if (k_rest < (k_best_l % 1000)) {
+ k_best_l = tk;
+ x_best_l = x;
+ }
+
+ if (k_rest > (k_best_t % 1000)) {
+ k_best_t = tk;
+ x_best_t = x;
+ }
+ }
+
+ if (1000 - (k_best_t % 1000) > (k_best_l % 1000)) {
+ k_best = k_best_l;
+ x_best = x_best_l;
+ } else {
+ k_best = k_best_t;
+ x_best = x_best_t;
+ }
+
+ k_best /= 1000;
+
+#if defined(CONFIG_MX23)
+ writeb(CLKCTRL_FRAC_CLKGATE,
+ &clkctrl_regs->hw_clkctrl_frac0_set[CLKCTRL_FRAC0_PIX]);
+ writeb(CLKCTRL_FRAC_CLKGATE | (x_best & CLKCTRL_FRAC_FRAC_MASK),
+ &clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_PIX]);
+ writeb(CLKCTRL_FRAC_CLKGATE,
+ &clkctrl_regs->hw_clkctrl_frac0_clr[CLKCTRL_FRAC0_PIX]);
+
+ writel(CLKCTRL_PIX_CLKGATE,
+ &clkctrl_regs->hw_clkctrl_pix_set);
+ clrsetbits_le32(&clkctrl_regs->hw_clkctrl_pix,
+ CLKCTRL_PIX_DIV_MASK | CLKCTRL_PIX_CLKGATE,
+ k_best << CLKCTRL_PIX_DIV_OFFSET);
+
+ while (readl(&clkctrl_regs->hw_clkctrl_pix) & CLKCTRL_PIX_BUSY)
+ ;
+#elif defined(CONFIG_MX28)
+ writeb(CLKCTRL_FRAC_CLKGATE,
+ &clkctrl_regs->hw_clkctrl_frac1_set[CLKCTRL_FRAC1_PIX]);
+ writeb(CLKCTRL_FRAC_CLKGATE | (x_best & CLKCTRL_FRAC_FRAC_MASK),
+ &clkctrl_regs->hw_clkctrl_frac1[CLKCTRL_FRAC1_PIX]);
+ writeb(CLKCTRL_FRAC_CLKGATE,
+ &clkctrl_regs->hw_clkctrl_frac1_clr[CLKCTRL_FRAC1_PIX]);
+
+ /* The i.MX28 Ref. Manual states:
+ * CLK_DIS_LCDIF Gate. If set to 1, CLK_DIS_LCDIF is gated off.
+ * 0: CLK_DIS_LCDIF is not gated.
+ * When this bit is modified, or when it is high,
+ * the DIV field should not change its value.
+ * The DIV field can change ONLY when this clock gate bit field is low.
+ * Note: This register does not have set/clear/toggle functionality!
+ */
+ /* clear CLKCTRL_DIS_LCDIF_CLKGATE */
+ writel(0, &clkctrl_regs->hw_clkctrl_lcdif);
+ writel(k_best << CLKCTRL_DIS_LCDIF_DIV_OFFSET,
+ &clkctrl_regs->hw_clkctrl_lcdif);
+
+ while (readl(&clkctrl_regs->hw_clkctrl_lcdif) & CLKCTRL_DIS_LCDIF_BUSY)
+ ;
+#endif
+}
+
+static uint32_t mxs_get_xbus_clk(void)
+{
+ uint32_t div;
+ uint32_t clkctrl;
+ uint32_t refclk = mxs_get_pclk();
+
+ clkctrl = readl(&clkctrl_regs->hw_clkctrl_xbus);
+ div = clkctrl & CLKCTRL_XBUS_DIV_MASK;
+
+ if (clkctrl & CLKCTRL_XBUS_DIV_FRAC_EN)
+ return get_frac_clk(refclk, div, CLKCTRL_XBUS_DIV_MASK);
+
+ return refclk / div;
+}
+
uint32_t mxc_get_clock(enum mxc_clock clk)
{
switch (clk) {
case MXC_ARM_CLK:
- return mx28_get_pclk() * 1000000;
+ return mxs_get_pclk() * 1000000;
case MXC_GPMI_CLK:
- return mx28_get_gpmiclk() * 1000000;
+ return mxs_get_gpmiclk() * 1000000;
case MXC_AHB_CLK:
case MXC_IPG_CLK:
- return mx28_get_hclk() * 1000000;
+ return mxs_get_hclk() * 1000000;
case MXC_EMI_CLK:
- return mx28_get_emiclk();
+ return mxs_get_emiclk();
case MXC_IO0_CLK:
- return mx28_get_ioclk(MXC_IOCLK0);
+ return mxs_get_ioclk(MXC_IOCLK0);
case MXC_IO1_CLK:
- return mx28_get_ioclk(MXC_IOCLK1);
+ return mxs_get_ioclk(MXC_IOCLK1);
+ case MXC_XTAL_CLK:
+ return XTAL_FREQ_KHZ * 1000;
case MXC_SSP0_CLK:
- return mx28_get_sspclk(MXC_SSPCLK0);
+ return mxs_get_sspclk(MXC_SSPCLK0);
+#ifdef CONFIG_MX28
case MXC_SSP1_CLK:
- return mx28_get_sspclk(MXC_SSPCLK1);
+ return mxs_get_sspclk(MXC_SSPCLK1);
case MXC_SSP2_CLK:
- return mx28_get_sspclk(MXC_SSPCLK2);
+ return mxs_get_sspclk(MXC_SSPCLK2);
case MXC_SSP3_CLK:
- return mx28_get_sspclk(MXC_SSPCLK3);
- case MXC_XTAL_CLK:
- return XTAL_FREQ_KHZ * 1000;
+ return mxs_get_sspclk(MXC_SSPCLK3);
+#endif
+ case MXC_XBUS_CLK:
+ return mxs_get_xbus_clk() * 1000000;
+ default:
+ printf("Invalid clock selector %u\n", clk);
}
return 0;
projects / karo-tx-uboot.git / blobdiff