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-rw-r--r--arch/arm/mach-pnx4008/clock.c983
1 files changed, 983 insertions, 0 deletions
diff --git a/arch/arm/mach-pnx4008/clock.c b/arch/arm/mach-pnx4008/clock.c
new file mode 100644
index 000000000000..f582ed2ec43c
--- /dev/null
+++ b/arch/arm/mach-pnx4008/clock.c
@@ -0,0 +1,983 @@
+/*
+ * arch/arm/mach-pnx4008/clock.c
+ *
+ * Clock control driver for PNX4008
+ *
+ * Authors: Vitaly Wool, Dmitry Chigirev <source@mvista.com>
+ * Generic clock management functions are partially based on:
+ * linux/arch/arm/mach-omap/clock.c
+ *
+ * 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+
+#include <asm/semaphore.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+
+#include <asm/arch/clock.h>
+#include "clock.h"
+
+/*forward declaration*/
+static struct clk per_ck;
+static struct clk hclk_ck;
+static struct clk ck_1MHz;
+static struct clk ck_13MHz;
+static struct clk ck_pll1;
+static int local_set_rate(struct clk *clk, u32 rate);
+
+static inline void clock_lock(void)
+{
+ local_irq_disable();
+}
+
+static inline void clock_unlock(void)
+{
+ local_irq_enable();
+}
+
+static void propagate_rate(struct clk *clk)
+{
+ struct clk *tmp_clk;
+
+ tmp_clk = clk;
+ while (tmp_clk->propagate_next) {
+ tmp_clk = tmp_clk->propagate_next;
+ local_set_rate(tmp_clk, tmp_clk->user_rate);
+ }
+}
+
+static inline void clk_reg_disable(struct clk *clk)
+{
+ if (clk->enable_reg)
+ __raw_writel(__raw_readl(clk->enable_reg) &
+ ~(1 << clk->enable_shift), clk->enable_reg);
+}
+
+static inline void clk_reg_enable(struct clk *clk)
+{
+ if (clk->enable_reg)
+ __raw_writel(__raw_readl(clk->enable_reg) |
+ (1 << clk->enable_shift), clk->enable_reg);
+}
+
+static inline void clk_reg_disable1(struct clk *clk)
+{
+ if (clk->enable_reg1)
+ __raw_writel(__raw_readl(clk->enable_reg1) &
+ ~(1 << clk->enable_shift1), clk->enable_reg1);
+}
+
+static inline void clk_reg_enable1(struct clk *clk)
+{
+ if (clk->enable_reg1)
+ __raw_writel(__raw_readl(clk->enable_reg1) |
+ (1 << clk->enable_shift1), clk->enable_reg1);
+}
+
+static int clk_wait_for_pll_lock(struct clk *clk)
+{
+ int i;
+ i = 0;
+ while (i++ < 0xFFF && !(__raw_readl(clk->scale_reg) & 1)) ; /*wait for PLL to lock */
+
+ if (!(__raw_readl(clk->scale_reg) & 1)) {
+ printk(KERN_ERR
+ "%s ERROR: failed to lock, scale reg data: %x\n",
+ clk->name, __raw_readl(clk->scale_reg));
+ return -1;
+ }
+ return 0;
+}
+
+static int switch_to_dirty_13mhz(struct clk *clk)
+{
+ int i;
+ int ret;
+ u32 tmp_reg;
+
+ ret = 0;
+
+ if (!clk->rate)
+ clk_reg_enable1(clk);
+
+ tmp_reg = __raw_readl(clk->parent_switch_reg);
+ /*if 13Mhz clock selected, select 13'MHz (dirty) source from OSC */
+ if (!(tmp_reg & 1)) {
+ tmp_reg |= (1 << 1); /* Trigger switch to 13'MHz (dirty) clock */
+ __raw_writel(tmp_reg, clk->parent_switch_reg);
+ i = 0;
+ while (i++ < 0xFFF && !(__raw_readl(clk->parent_switch_reg) & 1)) ; /*wait for 13'MHz selection status */
+
+ if (!(__raw_readl(clk->parent_switch_reg) & 1)) {
+ printk(KERN_ERR
+ "%s ERROR: failed to select 13'MHz, parent sw reg data: %x\n",
+ clk->name, __raw_readl(clk->parent_switch_reg));
+ ret = -1;
+ }
+ }
+
+ if (!clk->rate)
+ clk_reg_disable1(clk);
+
+ return ret;
+}
+
+static int switch_to_clean_13mhz(struct clk *clk)
+{
+ int i;
+ int ret;
+ u32 tmp_reg;
+
+ ret = 0;
+
+ if (!clk->rate)
+ clk_reg_enable1(clk);
+
+ tmp_reg = __raw_readl(clk->parent_switch_reg);
+ /*if 13'Mhz clock selected, select 13MHz (clean) source from OSC */
+ if (tmp_reg & 1) {
+ tmp_reg &= ~(1 << 1); /* Trigger switch to 13MHz (clean) clock */
+ __raw_writel(tmp_reg, clk->parent_switch_reg);
+ i = 0;
+ while (i++ < 0xFFF && (__raw_readl(clk->parent_switch_reg) & 1)) ; /*wait for 13MHz selection status */
+
+ if (__raw_readl(clk->parent_switch_reg) & 1) {
+ printk(KERN_ERR
+ "%s ERROR: failed to select 13MHz, parent sw reg data: %x\n",
+ clk->name, __raw_readl(clk->parent_switch_reg));
+ ret = -1;
+ }
+ }
+
+ if (!clk->rate)
+ clk_reg_disable1(clk);
+
+ return ret;
+}
+
+static int set_13MHz_parent(struct clk *clk, struct clk *parent)
+{
+ int ret = -EINVAL;
+
+ if (parent == &ck_13MHz)
+ ret = switch_to_clean_13mhz(clk);
+ else if (parent == &ck_pll1)
+ ret = switch_to_dirty_13mhz(clk);
+
+ return ret;
+}
+
+#define PLL160_MIN_FCCO 156000
+#define PLL160_MAX_FCCO 320000
+
+/*
+ * Calculate pll160 settings.
+ * Possible input: up to 320MHz with step of clk->parent->rate.
+ * In PNX4008 parent rate for pll160s may be either 1 or 13MHz.
+ * Ignored paths: "feedback" (bit 13 set), "div-by-N".
+ * Setting ARM PLL4 rate to 0 will put CPU into direct run mode.
+ * Setting PLL5 and PLL3 rate to 0 will disable USB and DSP clock input.
+ * Please refer to PNX4008 IC manual for details.
+ */
+
+static int pll160_set_rate(struct clk *clk, u32 rate)
+{
+ u32 tmp_reg, tmp_m, tmp_2p, i;
+ u32 parent_rate;
+ int ret = -EINVAL;
+
+ parent_rate = clk->parent->rate;
+
+ if (!parent_rate)
+ goto out;
+
+ /* set direct run for ARM or disable output for others */
+ clk_reg_disable(clk);
+
+ /* disable source input as well (ignored for ARM) */
+ clk_reg_disable1(clk);
+
+ tmp_reg = __raw_readl(clk->scale_reg);
+ tmp_reg &= ~0x1ffff; /*clear all settings, power down */
+ __raw_writel(tmp_reg, clk->scale_reg);
+
+ rate -= rate % parent_rate; /*round down the input */
+
+ if (rate > PLL160_MAX_FCCO)
+ rate = PLL160_MAX_FCCO;
+
+ if (!rate) {
+ clk->rate = 0;
+ ret = 0;
+ goto out;
+ }
+
+ clk_reg_enable1(clk);
+ tmp_reg = __raw_readl(clk->scale_reg);
+
+ if (rate == parent_rate) {
+ /*enter direct bypass mode */
+ tmp_reg |= ((1 << 14) | (1 << 15));
+ __raw_writel(tmp_reg, clk->scale_reg);
+ clk->rate = parent_rate;
+ clk_reg_enable(clk);
+ ret = 0;
+ goto out;
+ }
+
+ i = 0;
+ for (tmp_2p = 1; tmp_2p < 16; tmp_2p <<= 1) {
+ if (rate * tmp_2p >= PLL160_MIN_FCCO)
+ break;
+ i++;
+ }
+
+ if (tmp_2p > 1)
+ tmp_reg |= ((i - 1) << 11);
+ else
+ tmp_reg |= (1 << 14); /*direct mode, no divide */
+
+ tmp_m = rate * tmp_2p;
+ tmp_m /= parent_rate;
+
+ tmp_reg |= (tmp_m - 1) << 1; /*calculate M */
+ tmp_reg |= (1 << 16); /*power up PLL */
+ __raw_writel(tmp_reg, clk->scale_reg);
+
+ if (clk_wait_for_pll_lock(clk) < 0) {
+ clk_reg_disable(clk);
+ clk_reg_disable1(clk);
+
+ tmp_reg = __raw_readl(clk->scale_reg);
+ tmp_reg &= ~0x1ffff; /*clear all settings, power down */
+ __raw_writel(tmp_reg, clk->scale_reg);
+ clk->rate = 0;
+ ret = -EFAULT;
+ goto out;
+ }
+
+ clk->rate = (tmp_m * parent_rate) / tmp_2p;
+
+ if (clk->flags & RATE_PROPAGATES)
+ propagate_rate(clk);
+
+ clk_reg_enable(clk);
+ ret = 0;
+
+out:
+ return ret;
+}
+
+/*configure PER_CLK*/
+static int per_clk_set_rate(struct clk *clk, u32 rate)
+{
+ u32 tmp;
+
+ tmp = __raw_readl(clk->scale_reg);
+ tmp &= ~(0x1f << 2);
+ tmp |= ((clk->parent->rate / clk->rate) - 1) << 2;
+ __raw_writel(tmp, clk->scale_reg);
+ clk->rate = rate;
+ return 0;
+}
+
+/*configure HCLK*/
+static int hclk_set_rate(struct clk *clk, u32 rate)
+{
+ u32 tmp;
+ tmp = __raw_readl(clk->scale_reg);
+ tmp = tmp & ~0x3;
+ switch (rate) {
+ case 1:
+ break;
+ case 2:
+ tmp |= 1;
+ break;
+ case 4:
+ tmp |= 2;
+ break;
+ }
+
+ __raw_writel(tmp, clk->scale_reg);
+ clk->rate = rate;
+ return 0;
+}
+
+static u32 hclk_round_rate(struct clk *clk, u32 rate)
+{
+ switch (rate) {
+ case 1:
+ case 4:
+ return rate;
+ }
+ return 2;
+}
+
+static u32 per_clk_round_rate(struct clk *clk, u32 rate)
+{
+ return CLK_RATE_13MHZ;
+}
+
+static int on_off_set_rate(struct clk *clk, u32 rate)
+{
+ if (rate) {
+ clk_reg_enable(clk);
+ clk->rate = 1;
+ } else {
+ clk_reg_disable(clk);
+ clk->rate = 0;
+ }
+ return 0;
+}
+
+static int on_off_inv_set_rate(struct clk *clk, u32 rate)
+{
+ if (rate) {
+ clk_reg_disable(clk); /*enable bit is inverted */
+ clk->rate = 1;
+ } else {
+ clk_reg_enable(clk);
+ clk->rate = 0;
+ }
+ return 0;
+}
+
+static u32 on_off_round_rate(struct clk *clk, u32 rate)
+{
+ return (rate ? 1 : 0);
+}
+
+static u32 pll4_round_rate(struct clk *clk, u32 rate)
+{
+ if (rate > CLK_RATE_208MHZ)
+ rate = CLK_RATE_208MHZ;
+ if (rate == CLK_RATE_208MHZ && hclk_ck.user_rate == 1)
+ rate = CLK_RATE_208MHZ - CLK_RATE_13MHZ;
+ return (rate - (rate % (hclk_ck.user_rate * CLK_RATE_13MHZ)));
+}
+
+static u32 pll3_round_rate(struct clk *clk, u32 rate)
+{
+ if (rate > CLK_RATE_208MHZ)
+ rate = CLK_RATE_208MHZ;
+ return (rate - rate % CLK_RATE_13MHZ);
+}
+
+static u32 pll5_round_rate(struct clk *clk, u32 rate)
+{
+ return (rate ? CLK_RATE_48MHZ : 0);
+}
+
+static u32 ck_13MHz_round_rate(struct clk *clk, u32 rate)
+{
+ return (rate ? CLK_RATE_13MHZ : 0);
+}
+
+static int ck_13MHz_set_rate(struct clk *clk, u32 rate)
+{
+ if (rate) {
+ clk_reg_disable(clk); /*enable bit is inverted */
+ udelay(500);
+ clk->rate = CLK_RATE_13MHZ;
+ ck_1MHz.rate = CLK_RATE_1MHZ;
+ } else {
+ clk_reg_enable(clk);
+ clk->rate = 0;
+ ck_1MHz.rate = 0;
+ }
+ return 0;
+}
+
+static int pll1_set_rate(struct clk *clk, u32 rate)
+{
+#if 0 /* doesn't work on some boards, probably a HW BUG */
+ if (rate) {
+ clk_reg_disable(clk); /*enable bit is inverted */
+ if (!clk_wait_for_pll_lock(clk)) {
+ clk->rate = CLK_RATE_13MHZ;
+ } else {
+ clk_reg_enable(clk);
+ clk->rate = 0;
+ }
+
+ } else {
+ clk_reg_enable(clk);
+ clk->rate = 0;
+ }
+#endif
+ return 0;
+}
+
+/* Clock sources */
+
+static struct clk osc_13MHz = {
+ .name = "osc_13MHz",
+ .flags = FIXED_RATE,
+ .rate = CLK_RATE_13MHZ,
+};
+
+static struct clk ck_13MHz = {
+ .name = "ck_13MHz",
+ .parent = &osc_13MHz,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &ck_13MHz_round_rate,
+ .set_rate = &ck_13MHz_set_rate,
+ .enable_reg = OSC13CTRL_REG,
+ .enable_shift = 0,
+ .rate = CLK_RATE_13MHZ,
+};
+
+static struct clk osc_32KHz = {
+ .name = "osc_32KHz",
+ .flags = FIXED_RATE,
+ .rate = CLK_RATE_32KHZ,
+};
+
+/*attached to PLL5*/
+static struct clk ck_1MHz = {
+ .name = "ck_1MHz",
+ .flags = FIXED_RATE | PARENT_SET_RATE,
+ .parent = &ck_13MHz,
+};
+
+/* PLL1 (397) - provides 13' MHz clock */
+static struct clk ck_pll1 = {
+ .name = "ck_pll1",
+ .parent = &osc_32KHz,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &ck_13MHz_round_rate,
+ .set_rate = &pll1_set_rate,
+ .enable_reg = PLLCTRL_REG,
+ .enable_shift = 1,
+ .scale_reg = PLLCTRL_REG,
+ .rate = CLK_RATE_13MHZ,
+};
+
+/* CPU/Bus PLL */
+static struct clk ck_pll4 = {
+ .name = "ck_pll4",
+ .parent = &ck_pll1,
+ .flags = RATE_PROPAGATES | NEEDS_INITIALIZATION,
+ .propagate_next = &per_ck,
+ .round_rate = &pll4_round_rate,
+ .set_rate = &pll160_set_rate,
+ .rate = CLK_RATE_208MHZ,
+ .scale_reg = HCLKPLLCTRL_REG,
+ .enable_reg = PWRCTRL_REG,
+ .enable_shift = 2,
+ .parent_switch_reg = SYSCLKCTRL_REG,
+ .set_parent = &set_13MHz_parent,
+};
+
+/* USB PLL */
+static struct clk ck_pll5 = {
+ .name = "ck_pll5",
+ .parent = &ck_1MHz,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &pll5_round_rate,
+ .set_rate = &pll160_set_rate,
+ .scale_reg = USBCTRL_REG,
+ .enable_reg = USBCTRL_REG,
+ .enable_shift = 18,
+ .enable_reg1 = USBCTRL_REG,
+ .enable_shift1 = 17,
+};
+
+/* XPERTTeak DSP PLL */
+static struct clk ck_pll3 = {
+ .name = "ck_pll3",
+ .parent = &ck_pll1,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &pll3_round_rate,
+ .set_rate = &pll160_set_rate,
+ .scale_reg = DSPPLLCTRL_REG,
+ .enable_reg = DSPCLKCTRL_REG,
+ .enable_shift = 3,
+ .enable_reg1 = DSPCLKCTRL_REG,
+ .enable_shift1 = 2,
+ .parent_switch_reg = DSPCLKCTRL_REG,
+ .set_parent = &set_13MHz_parent,
+};
+
+static struct clk hclk_ck = {
+ .name = "hclk_ck",
+ .parent = &ck_pll4,
+ .flags = PARENT_SET_RATE,
+ .set_rate = &hclk_set_rate,
+ .round_rate = &hclk_round_rate,
+ .scale_reg = HCLKDIVCTRL_REG,
+ .rate = 2,
+ .user_rate = 2,
+};
+
+static struct clk per_ck = {
+ .name = "per_ck",
+ .parent = &ck_pll4,
+ .flags = FIXED_RATE,
+ .propagate_next = &hclk_ck,
+ .set_rate = &per_clk_set_rate,
+ .round_rate = &per_clk_round_rate,
+ .scale_reg = HCLKDIVCTRL_REG,
+ .rate = CLK_RATE_13MHZ,
+ .user_rate = CLK_RATE_13MHZ,
+};
+
+static struct clk m2hclk_ck = {
+ .name = "m2hclk_ck",
+ .parent = &hclk_ck,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_inv_set_rate,
+ .rate = 1,
+ .enable_shift = 6,
+ .enable_reg = PWRCTRL_REG,
+};
+
+static struct clk vfp9_ck = {
+ .name = "vfp9_ck",
+ .parent = &ck_pll4,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .rate = 1,
+ .enable_shift = 4,
+ .enable_reg = VFP9CLKCTRL_REG,
+};
+
+static struct clk keyscan_ck = {
+ .name = "keyscan_ck",
+ .parent = &osc_32KHz,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 0,
+ .enable_reg = KEYCLKCTRL_REG,
+};
+
+static struct clk touch_ck = {
+ .name = "touch_ck",
+ .parent = &osc_32KHz,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 0,
+ .enable_reg = TSCLKCTRL_REG,
+};
+
+static struct clk pwm1_ck = {
+ .name = "pwm1_ck",
+ .parent = &osc_32KHz,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 0,
+ .enable_reg = PWMCLKCTRL_REG,
+};
+
+static struct clk pwm2_ck = {
+ .name = "pwm2_ck",
+ .parent = &osc_32KHz,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 2,
+ .enable_reg = PWMCLKCTRL_REG,
+};
+
+static struct clk jpeg_ck = {
+ .name = "jpeg_ck",
+ .parent = &hclk_ck,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 0,
+ .enable_reg = JPEGCLKCTRL_REG,
+};
+
+static struct clk ms_ck = {
+ .name = "ms_ck",
+ .parent = &ck_pll4,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 5,
+ .enable_reg = MSCTRL_REG,
+};
+
+static struct clk dum_ck = {
+ .name = "dum_ck",
+ .parent = &hclk_ck,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 0,
+ .enable_reg = DUMCLKCTRL_REG,
+};
+
+static struct clk flash_ck = {
+ .name = "flash_ck",
+ .parent = &hclk_ck,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 1, /* Only MLC clock supported */
+ .enable_reg = FLASHCLKCTRL_REG,
+};
+
+static struct clk i2c0_ck = {
+ .name = "i2c0_ck",
+ .parent = &per_ck,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 0,
+ .enable_reg = I2CCLKCTRL_REG,
+};
+
+static struct clk i2c1_ck = {
+ .name = "i2c1_ck",
+ .parent = &per_ck,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 1,
+ .enable_reg = I2CCLKCTRL_REG,
+};
+
+static struct clk i2c2_ck = {
+ .name = "i2c2_ck",
+ .parent = &per_ck,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 2,
+ .enable_reg = USB_OTG_CLKCTRL_REG,
+};
+
+static struct clk spi0_ck = {
+ .name = "spi0_ck",
+ .parent = &hclk_ck,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 0,
+ .enable_reg = SPICTRL_REG,
+};
+
+static struct clk spi1_ck = {
+ .name = "spi1_ck",
+ .parent = &hclk_ck,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 4,
+ .enable_reg = SPICTRL_REG,
+};
+
+static struct clk dma_ck = {
+ .name = "dma_ck",
+ .parent = &hclk_ck,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 0,
+ .enable_reg = DMACLKCTRL_REG,
+};
+
+static struct clk uart3_ck = {
+ .name = "uart3_ck",
+ .parent = &per_ck,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .rate = 1,
+ .enable_shift = 0,
+ .enable_reg = UARTCLKCTRL_REG,
+};
+
+static struct clk uart4_ck = {
+ .name = "uart4_ck",
+ .parent = &per_ck,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 1,
+ .enable_reg = UARTCLKCTRL_REG,
+};
+
+static struct clk uart5_ck = {
+ .name = "uart5_ck",
+ .parent = &per_ck,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .rate = 1,
+ .enable_shift = 2,
+ .enable_reg = UARTCLKCTRL_REG,
+};
+
+static struct clk uart6_ck = {
+ .name = "uart6_ck",
+ .parent = &per_ck,
+ .flags = NEEDS_INITIALIZATION,
+ .round_rate = &on_off_round_rate,
+ .set_rate = &on_off_set_rate,
+ .enable_shift = 3,
+ .enable_reg = UARTCLKCTRL_REG,
+};
+
+/* These clocks are visible outside this module
+ * and can be initialized
+ */
+static struct clk *onchip_clks[] = {
+ &ck_13MHz,
+ &ck_pll1,
+ &ck_pll4,
+ &ck_pll5,
+ &ck_pll3,
+ &vfp9_ck,
+ &m2hclk_ck,
+ &hclk_ck,
+ &dma_ck,
+ &flash_ck,
+ &dum_ck,
+ &keyscan_ck,
+ &pwm1_ck,
+ &pwm2_ck,
+ &jpeg_ck,
+ &ms_ck,
+ &touch_ck,
+ &i2c0_ck,
+ &i2c1_ck,
+ &i2c2_ck,
+ &spi0_ck,
+ &spi1_ck,
+ &uart3_ck,
+ &uart4_ck,
+ &uart5_ck,
+ &uart6_ck,
+};
+
+static int local_clk_enable(struct clk *clk)
+{
+ int ret = 0;
+
+ if (!(clk->flags & FIXED_RATE) && !clk->rate && clk->set_rate
+ && clk->user_rate)
+ ret = clk->set_rate(clk, clk->user_rate);
+ return ret;
+}
+
+static void local_clk_disable(struct clk *clk)
+{
+ if (!(clk->flags & FIXED_RATE) && clk->rate && clk->set_rate)
+ clk->set_rate(clk, 0);
+}
+
+static void local_clk_unuse(struct clk *clk)
+{
+ if (clk->usecount > 0 && !(--clk->usecount)) {
+ local_clk_disable(clk);
+ if (clk->parent)
+ local_clk_unuse(clk->parent);
+ }
+}
+
+static int local_clk_use(struct clk *clk)
+{
+ int ret = 0;
+ if (clk->usecount++ == 0) {
+ if (clk->parent)
+ ret = local_clk_use(clk->parent);
+
+ if (ret != 0) {
+ clk->usecount--;
+ goto out;
+ }
+
+ ret = local_clk_enable(clk);
+
+ if (ret != 0 && clk->parent) {
+ local_clk_unuse(clk->parent);
+ clk->usecount--;
+ }
+ }
+out:
+ return ret;
+}
+
+static int local_set_rate(struct clk *clk, u32 rate)
+{
+ int ret = -EINVAL;
+ if (clk->set_rate) {
+
+ if (clk->user_rate == clk->rate && clk->parent->rate) {
+ /* if clock enabled or rate not set */
+ clk->user_rate = clk->round_rate(clk, rate);
+ ret = clk->set_rate(clk, clk->user_rate);
+ } else
+ clk->user_rate = clk->round_rate(clk, rate);
+ ret = 0;
+ }
+ return ret;
+}
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+ int ret = -EINVAL;
+
+ if (clk->flags & FIXED_RATE)
+ goto out;
+
+ clock_lock();
+ if ((clk->flags & PARENT_SET_RATE) && clk->parent) {
+
+ clk->user_rate = clk->round_rate(clk, rate);
+ /* parent clock needs to be refreshed
+ for the setting to take effect */
+ } else {
+ ret = local_set_rate(clk, rate);
+ }
+ ret = 0;
+ clock_unlock();
+
+out:
+ return ret;
+}
+
+EXPORT_SYMBOL(clk_set_rate);
+
+struct clk *clk_get(struct device *dev, const char *id)
+{
+ struct clk *clk = ERR_PTR(-ENOENT);
+ struct clk **clkp;
+
+ clock_lock();
+ for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
+ clkp++) {
+ if (strcmp(id, (*clkp)->name) == 0
+ && try_module_get((*clkp)->owner)) {
+ clk = (*clkp);
+ break;
+ }
+ }
+ clock_unlock();
+
+ return clk;
+}
+EXPORT_SYMBOL(clk_get);
+
+void clk_put(struct clk *clk)
+{
+ clock_lock();
+ if (clk && !IS_ERR(clk))
+ module_put(clk->owner);
+ clock_unlock();
+}
+EXPORT_SYMBOL(clk_put);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+ unsigned long ret;
+ clock_lock();
+ ret = clk->rate;
+ clock_unlock();
+ return ret;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+int clk_enable(struct clk *clk)
+{
+ int ret = 0;
+
+ clock_lock();
+ ret = local_clk_use(clk);
+ clock_unlock();
+ return ret;
+}
+
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+ clock_lock();
+ local_clk_unuse(clk);
+ clock_unlock();
+}
+
+EXPORT_SYMBOL(clk_disable);
+
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+ long ret;
+ clock_lock();
+ if (clk->round_rate)
+ ret = clk->round_rate(clk, rate);
+ else
+ ret = clk->rate;
+ clock_unlock();
+ return ret;
+}
+
+EXPORT_SYMBOL(clk_round_rate);
+
+int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+ int ret = -ENODEV;
+ if (!clk->set_parent)
+ goto out;
+
+ clock_lock();
+ ret = clk->set_parent(clk, parent);
+ if (!ret)
+ clk->parent = parent;
+ clock_unlock();
+
+out:
+ return ret;
+}
+
+EXPORT_SYMBOL(clk_set_parent);
+
+static int __init clk_init(void)
+{
+ struct clk **clkp;
+
+ /* Disable autoclocking, as it doesn't seem to work */
+ __raw_writel(0xff, AUTOCLK_CTRL);
+
+ for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
+ clkp++) {
+ if (((*clkp)->flags & NEEDS_INITIALIZATION)
+ && ((*clkp)->set_rate)) {
+ (*clkp)->user_rate = (*clkp)->rate;
+ local_set_rate((*clkp), (*clkp)->user_rate);
+ if ((*clkp)->set_parent)
+ (*clkp)->set_parent((*clkp), (*clkp)->parent);
+ }
+ pr_debug("%s: clock %s, rate %ld\n",
+ __FUNCTION__, (*clkp)->name, (*clkp)->rate);
+ }
+
+ local_clk_use(&ck_pll4);
+
+ /* if ck_13MHz is not used, disable it. */
+ if (ck_13MHz.usecount == 0)
+ local_clk_disable(&ck_13MHz);
+
+ /* Disable autoclocking */
+ __raw_writeb(0xff, AUTOCLK_CTRL);
+
+ return 0;
+}
+
+arch_initcall(clk_init);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.