diff options
Diffstat (limited to 'arch/arm/mach-pnx4008/clock.c')
| -rw-r--r-- | arch/arm/mach-pnx4008/clock.c | 1010 |
1 files changed, 1010 insertions, 0 deletions
diff --git a/arch/arm/mach-pnx4008/clock.c b/arch/arm/mach-pnx4008/clock.c new file mode 100644 index 00000000000..285b22f631e --- /dev/null +++ b/arch/arm/mach-pnx4008/clock.c @@ -0,0 +1,1010 @@ +/* + * 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_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); + +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); +} + +int clk_enable(struct clk *clk) +{ + int ret = 0; + + clock_lock(); + ret = local_clk_enable(clk); + clock_unlock(); + return ret; +} + +EXPORT_SYMBOL(clk_enable); + +void clk_disable(struct clk *clk) +{ + clock_lock(); + local_clk_disable(clk); + clock_unlock(); +} + +EXPORT_SYMBOL(clk_disable); + +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; +} + +/* The main purpose of clk_use ans clk_unuse functions + * is to control switching 13MHz oscillator and PLL1 (13'MHz), + * so that they are disabled whenever none of PLL2-5 is using them. + * Although in theory these functions should work with any clock, + * please use them only on PLL2 - PLL5 to avoid confusion. + */ +int clk_use(struct clk *clk) +{ + int ret = 0; + + clock_lock(); + ret = local_clk_use(clk); + clock_unlock(); + return ret; +} +EXPORT_SYMBOL(clk_use); + +void clk_unuse(struct clk *clk) +{ + + clock_lock(); + local_clk_unuse(clk); + clock_unlock(); +} + +EXPORT_SYMBOL(clk_unuse); + +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); + } + + 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); |