diff options
Diffstat (limited to 'arch/arm/plat-omap/clock.c')
| -rw-r--r-- | arch/arm/plat-omap/clock.c | 1076 |
1 files changed, 1076 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c new file mode 100644 index 000000000000..155157f309e0 --- /dev/null +++ b/arch/arm/plat-omap/clock.c @@ -0,0 +1,1076 @@ +/* + * linux/arch/arm/plat-omap/clock.c + * + * Copyright (C) 2004 Nokia corporation + * Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/errno.h> +#include <linux/err.h> + +#include <asm/semaphore.h> +#include <asm/hardware/clock.h> +#include <asm/arch/board.h> +#include <asm/arch/usb.h> + +#include "clock.h" + +static LIST_HEAD(clocks); +static DECLARE_MUTEX(clocks_sem); +static DEFINE_SPINLOCK(clockfw_lock); +static void propagate_rate(struct clk * clk); +/* External clock (MCLK & BCLK) functions */ +static int set_ext_clk_rate(struct clk * clk, unsigned long rate); +static long round_ext_clk_rate(struct clk * clk, unsigned long rate); +static void init_ext_clk(struct clk * clk); +/* MPU virtual clock functions */ +static int select_table_rate(struct clk * clk, unsigned long rate); +static long round_to_table_rate(struct clk * clk, unsigned long rate); +void clk_setdpll(__u16, __u16); + +struct mpu_rate rate_table[] = { + /* MPU MHz, xtal MHz, dpll1 MHz, CKCTL, DPLL_CTL + * armdiv, dspdiv, dspmmu, tcdiv, perdiv, lcddiv + */ +#if defined(CONFIG_OMAP_ARM_216MHZ) + { 216000000, 12000000, 216000000, 0x050d, 0x2910 }, /* 1/1/2/2/2/8 */ +#endif +#if defined(CONFIG_OMAP_ARM_195MHZ) + { 195000000, 13000000, 195000000, 0x050e, 0x2790 }, /* 1/1/2/2/4/8 */ +#endif +#if defined(CONFIG_OMAP_ARM_192MHZ) + { 192000000, 19200000, 192000000, 0x050f, 0x2510 }, /* 1/1/2/2/8/8 */ + { 192000000, 12000000, 192000000, 0x050f, 0x2810 }, /* 1/1/2/2/8/8 */ + { 96000000, 12000000, 192000000, 0x055f, 0x2810 }, /* 2/2/2/2/8/8 */ + { 48000000, 12000000, 192000000, 0x0ccf, 0x2810 }, /* 4/4/4/4/8/8 */ + { 24000000, 12000000, 192000000, 0x0fff, 0x2810 }, /* 8/8/8/8/8/8 */ +#endif +#if defined(CONFIG_OMAP_ARM_182MHZ) + { 182000000, 13000000, 182000000, 0x050e, 0x2710 }, /* 1/1/2/2/4/8 */ +#endif +#if defined(CONFIG_OMAP_ARM_168MHZ) + { 168000000, 12000000, 168000000, 0x010f, 0x2710 }, /* 1/1/1/2/8/8 */ +#endif +#if defined(CONFIG_OMAP_ARM_150MHZ) + { 150000000, 12000000, 150000000, 0x150a, 0x2cb0 }, /* 0/0/1/1/2/2 */ +#endif +#if defined(CONFIG_OMAP_ARM_120MHZ) + { 120000000, 12000000, 120000000, 0x010a, 0x2510 }, /* 1/1/1/2/4/4 */ +#endif +#if defined(CONFIG_OMAP_ARM_96MHZ) + { 96000000, 12000000, 96000000, 0x0005, 0x2410 }, /* 1/1/1/1/2/2 */ +#endif +#if defined(CONFIG_OMAP_ARM_60MHZ) + { 60000000, 12000000, 60000000, 0x0005, 0x2290 }, /* 1/1/1/1/2/2 */ +#endif +#if defined(CONFIG_OMAP_ARM_30MHZ) + { 30000000, 12000000, 60000000, 0x0555, 0x2290 }, /* 2/2/2/2/2/2 */ +#endif + { 0, 0, 0, 0, 0 }, +}; + + +static void ckctl_recalc(struct clk * clk) +{ + int dsor; + + /* Calculate divisor encoded as 2-bit exponent */ + dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset)); + if (unlikely(clk->rate == clk->parent->rate / dsor)) + return; /* No change, quick exit */ + clk->rate = clk->parent->rate / dsor; + + if (unlikely(clk->flags & RATE_PROPAGATES)) + propagate_rate(clk); +} + + +static void followparent_recalc(struct clk * clk) +{ + clk->rate = clk->parent->rate; +} + + +static void watchdog_recalc(struct clk * clk) +{ + clk->rate = clk->parent->rate / 14; +} + + +static struct clk ck_ref = { + .name = "ck_ref", + .rate = 12000000, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | + ALWAYS_ENABLED, +}; + +static struct clk ck_dpll1 = { + .name = "ck_dpll1", + .parent = &ck_ref, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | + RATE_PROPAGATES | ALWAYS_ENABLED, +}; + +static struct clk ck_dpll1out = { + .name = "ck_dpll1out", + .parent = &ck_dpll1, + .flags = CLOCK_IN_OMAP16XX, + .enable_reg = ARM_IDLECT2, + .enable_bit = EN_CKOUT_ARM, + .recalc = &followparent_recalc, +}; + +static struct clk arm_ck = { + .name = "arm_ck", + .parent = &ck_dpll1, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | + RATE_CKCTL | RATE_PROPAGATES | ALWAYS_ENABLED, + .rate_offset = CKCTL_ARMDIV_OFFSET, + .recalc = &ckctl_recalc, +}; + +static struct clk armper_ck = { + .name = "armper_ck", + .parent = &ck_dpll1, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | + RATE_CKCTL, + .enable_reg = ARM_IDLECT2, + .enable_bit = EN_PERCK, + .rate_offset = CKCTL_PERDIV_OFFSET, + .recalc = &ckctl_recalc, +}; + +static struct clk arm_gpio_ck = { + .name = "arm_gpio_ck", + .parent = &ck_dpll1, + .flags = CLOCK_IN_OMAP1510, + .enable_reg = ARM_IDLECT2, + .enable_bit = EN_GPIOCK, + .recalc = &followparent_recalc, +}; + +static struct clk armxor_ck = { + .name = "armxor_ck", + .parent = &ck_ref, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX, + .enable_reg = ARM_IDLECT2, + .enable_bit = EN_XORPCK, + .recalc = &followparent_recalc, +}; + +static struct clk armtim_ck = { + .name = "armtim_ck", + .parent = &ck_ref, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX, + .enable_reg = ARM_IDLECT2, + .enable_bit = EN_TIMCK, + .recalc = &followparent_recalc, +}; + +static struct clk armwdt_ck = { + .name = "armwdt_ck", + .parent = &ck_ref, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX, + .enable_reg = ARM_IDLECT2, + .enable_bit = EN_WDTCK, + .recalc = &watchdog_recalc, +}; + +static struct clk arminth_ck16xx = { + .name = "arminth_ck", + .parent = &arm_ck, + .flags = CLOCK_IN_OMAP16XX, + .recalc = &followparent_recalc, + /* Note: On 16xx the frequency can be divided by 2 by programming + * ARM_CKCTL:ARM_INTHCK_SEL(14) to 1 + * + * 1510 version is in TC clocks. + */ +}; + +static struct clk dsp_ck = { + .name = "dsp_ck", + .parent = &ck_dpll1, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | + RATE_CKCTL, + .enable_reg = ARM_CKCTL, + .enable_bit = EN_DSPCK, + .rate_offset = CKCTL_DSPDIV_OFFSET, + .recalc = &ckctl_recalc, +}; + +static struct clk dspmmu_ck = { + .name = "dspmmu_ck", + .parent = &ck_dpll1, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | + RATE_CKCTL | ALWAYS_ENABLED, + .rate_offset = CKCTL_DSPMMUDIV_OFFSET, + .recalc = &ckctl_recalc, +}; + +static struct clk tc_ck = { + .name = "tc_ck", + .parent = &ck_dpll1, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | CLOCK_IN_OMAP730 | + RATE_CKCTL | RATE_PROPAGATES | ALWAYS_ENABLED, + .rate_offset = CKCTL_TCDIV_OFFSET, + .recalc = &ckctl_recalc, +}; + +static struct clk arminth_ck1510 = { + .name = "arminth_ck", + .parent = &tc_ck, + .flags = CLOCK_IN_OMAP1510, + .recalc = &followparent_recalc, + /* Note: On 1510 the frequency follows TC_CK + * + * 16xx version is in MPU clocks. + */ +}; + +static struct clk tipb_ck = { + .name = "tibp_ck", + .parent = &tc_ck, + .flags = CLOCK_IN_OMAP1510, + .recalc = &followparent_recalc, +}; + +static struct clk l3_ocpi_ck = { + .name = "l3_ocpi_ck", + .parent = &tc_ck, + .flags = CLOCK_IN_OMAP16XX, + .enable_reg = ARM_IDLECT3, + .enable_bit = EN_OCPI_CK, + .recalc = &followparent_recalc, +}; + +static struct clk tc1_ck = { + .name = "tc1_ck", + .parent = &tc_ck, + .flags = CLOCK_IN_OMAP16XX, + .enable_reg = ARM_IDLECT3, + .enable_bit = EN_TC1_CK, + .recalc = &followparent_recalc, +}; + +static struct clk tc2_ck = { + .name = "tc2_ck", + .parent = &tc_ck, + .flags = CLOCK_IN_OMAP16XX, + .enable_reg = ARM_IDLECT3, + .enable_bit = EN_TC2_CK, + .recalc = &followparent_recalc, +}; + +static struct clk dma_ck = { + .name = "dma_ck", + .parent = &tc_ck, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX, + .recalc = &followparent_recalc, +}; + +static struct clk dma_lcdfree_ck = { + .name = "dma_lcdfree_ck", + .parent = &tc_ck, + .flags = CLOCK_IN_OMAP16XX, + .recalc = &followparent_recalc, +}; + +static struct clk api_ck = { + .name = "api_ck", + .parent = &tc_ck, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX, + .enable_reg = ARM_IDLECT2, + .enable_bit = EN_APICK, + .recalc = &followparent_recalc, +}; + +static struct clk lb_ck = { + .name = "lb_ck", + .parent = &tc_ck, + .flags = CLOCK_IN_OMAP1510, + .enable_reg = ARM_IDLECT2, + .enable_bit = EN_LBCK, + .recalc = &followparent_recalc, +}; + +static struct clk rhea1_ck = { + .name = "rhea1_ck", + .parent = &tc_ck, + .flags = CLOCK_IN_OMAP16XX, + .recalc = &followparent_recalc, +}; + +static struct clk rhea2_ck = { + .name = "rhea2_ck", + .parent = &tc_ck, + .flags = CLOCK_IN_OMAP16XX, + .recalc = &followparent_recalc, +}; + +static struct clk lcd_ck = { + .name = "lcd_ck", + .parent = &ck_dpll1, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | CLOCK_IN_OMAP730 | + RATE_CKCTL, + .enable_reg = ARM_IDLECT2, + .enable_bit = EN_LCDCK, + .rate_offset = CKCTL_LCDDIV_OFFSET, + .recalc = &ckctl_recalc, +}; + +static struct clk uart1_ck = { + .name = "uart1_ck", + /* Direct from ULPD, no parent */ + .rate = 48000000, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | + RATE_FIXED | ENABLE_REG_32BIT, + .enable_reg = MOD_CONF_CTRL_0, + .enable_bit = 29, + /* (Only on 1510) + * The "enable bit" actually chooses between 48MHz and 12MHz. + */ +}; + +static struct clk uart2_ck = { + .name = "uart2_ck", + /* Direct from ULPD, no parent */ + .rate = 48000000, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | + RATE_FIXED | ENABLE_REG_32BIT, + .enable_reg = MOD_CONF_CTRL_0, + .enable_bit = 30, + /* (for both 1510 and 16xx) + * The "enable bit" actually chooses between 48MHz and 12MHz/32kHz. + */ +}; + +static struct clk uart3_ck = { + .name = "uart3_ck", + /* Direct from ULPD, no parent */ + .rate = 48000000, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | + RATE_FIXED | ENABLE_REG_32BIT, + .enable_reg = MOD_CONF_CTRL_0, + .enable_bit = 31, + /* (Only on 1510) + * The "enable bit" actually chooses between 48MHz and 12MHz. + */ +}; + +static struct clk usb_clko = { /* 6 MHz output on W4_USB_CLKO */ + .name = "usb_clko", + /* Direct from ULPD, no parent */ + .rate = 6000000, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | + RATE_FIXED | ENABLE_REG_32BIT, + .enable_reg = ULPD_CLOCK_CTRL, + .enable_bit = USB_MCLK_EN_BIT, +}; + +static struct clk usb_hhc_ck1510 = { + .name = "usb_hhc_ck", + /* Direct from ULPD, no parent */ + .rate = 48000000, /* Actually 2 clocks, 12MHz and 48MHz */ + .flags = CLOCK_IN_OMAP1510 | + RATE_FIXED | ENABLE_REG_32BIT, + .enable_reg = MOD_CONF_CTRL_0, + .enable_bit = USB_HOST_HHC_UHOST_EN, +}; + +static struct clk usb_hhc_ck16xx = { + .name = "usb_hhc_ck", + /* Direct from ULPD, no parent */ + .rate = 48000000, + /* OTG_SYSCON_2.OTG_PADEN == 0 (not 1510-compatible) */ + .flags = CLOCK_IN_OMAP16XX | + RATE_FIXED | ENABLE_REG_32BIT, + .enable_reg = OTG_BASE + 0x08 /* OTG_SYSCON_2 */, + .enable_bit = 8 /* UHOST_EN */, +}; + +static struct clk mclk_1510 = { + .name = "mclk", + /* Direct from ULPD, no parent. May be enabled by ext hardware. */ + .rate = 12000000, + .flags = CLOCK_IN_OMAP1510 | RATE_FIXED, +}; + +static struct clk mclk_16xx = { + .name = "mclk", + /* Direct from ULPD, no parent. May be enabled by ext hardware. */ + .flags = CLOCK_IN_OMAP16XX, + .enable_reg = COM_CLK_DIV_CTRL_SEL, + .enable_bit = COM_ULPD_PLL_CLK_REQ, + .set_rate = &set_ext_clk_rate, + .round_rate = &round_ext_clk_rate, + .init = &init_ext_clk, +}; + +static struct clk bclk_1510 = { + .name = "bclk", + /* Direct from ULPD, no parent. May be enabled by ext hardware. */ + .rate = 12000000, + .flags = CLOCK_IN_OMAP1510 | RATE_FIXED, +}; + +static struct clk bclk_16xx = { + .name = "bclk", + /* Direct from ULPD, no parent. May be enabled by ext hardware. */ + .flags = CLOCK_IN_OMAP16XX, + .enable_reg = SWD_CLK_DIV_CTRL_SEL, + .enable_bit = SWD_ULPD_PLL_CLK_REQ, + .set_rate = &set_ext_clk_rate, + .round_rate = &round_ext_clk_rate, + .init = &init_ext_clk, +}; + +static struct clk mmc1_ck = { + .name = "mmc1_ck", + /* Functional clock is direct from ULPD, interface clock is ARMPER */ + .parent = &armper_ck, + .rate = 48000000, + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | + RATE_FIXED | ENABLE_REG_32BIT, + .enable_reg = MOD_CONF_CTRL_0, + .enable_bit = 23, +}; + +static struct clk mmc2_ck = { + .name = "mmc2_ck", + /* Functional clock is direct from ULPD, interface clock is ARMPER */ + .parent = &armper_ck, + .rate = 48000000, + .flags = CLOCK_IN_OMAP16XX | + RATE_FIXED | ENABLE_REG_32BIT, + .enable_reg = MOD_CONF_CTRL_0, + .enable_bit = 20, +}; + +static struct clk virtual_ck_mpu = { + .name = "mpu", + .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | + VIRTUAL_CLOCK | ALWAYS_ENABLED, + .parent = &arm_ck, /* Is smarter alias for */ + .recalc = &followparent_recalc, + .set_rate = &select_table_rate, + .round_rate = &round_to_table_rate, +}; + + +static struct clk * onchip_clks[] = { + /* non-ULPD clocks */ + &ck_ref, + &ck_dpll1, + /* CK_GEN1 clocks */ + &ck_dpll1out, + &arm_ck, + &armper_ck, + &arm_gpio_ck, + &armxor_ck, + &armtim_ck, + &armwdt_ck, + &arminth_ck1510, &arminth_ck16xx, + /* CK_GEN2 clocks */ + &dsp_ck, + &dspmmu_ck, + /* CK_GEN3 clocks */ + &tc_ck, + &tipb_ck, + &l3_ocpi_ck, + &tc1_ck, + &tc2_ck, + &dma_ck, + &dma_lcdfree_ck, + &api_ck, + &lb_ck, + &rhea1_ck, + &rhea2_ck, + &lcd_ck, + /* ULPD clocks */ + &uart1_ck, + &uart2_ck, + &uart3_ck, + &usb_clko, + &usb_hhc_ck1510, &usb_hhc_ck16xx, + &mclk_1510, &mclk_16xx, + &bclk_1510, &bclk_16xx, + &mmc1_ck, + &mmc2_ck, + /* Virtual clocks */ + &virtual_ck_mpu, +}; + +struct clk *clk_get(struct device *dev, const char *id) +{ + struct clk *p, *clk = ERR_PTR(-ENOENT); + + down(&clocks_sem); + list_for_each_entry(p, &clocks, node) { + if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) { + clk = p; + break; + } + } + up(&clocks_sem); + + return clk; +} +EXPORT_SYMBOL(clk_get); + + +void clk_put(struct clk *clk) +{ + if (clk && !IS_ERR(clk)) + module_put(clk->owner); +} +EXPORT_SYMBOL(clk_put); + + +int __clk_enable(struct clk *clk) +{ + __u16 regval16; + __u32 regval32; + + if (clk->flags & ALWAYS_ENABLED) + return 0; + + if (unlikely(clk->enable_reg == 0)) { + printk(KERN_ERR "clock.c: Enable for %s without enable code\n", + clk->name); + return 0; + } + + if (clk->flags & ENABLE_REG_32BIT) { + regval32 = omap_readl(clk->enable_reg); + regval32 |= (1 << clk->enable_bit); + omap_writel(regval32, clk->enable_reg); + } else { + regval16 = omap_readw(clk->enable_reg); + regval16 |= (1 << clk->enable_bit); + omap_writew(regval16, clk->enable_reg); + } + + return 0; +} + + +void __clk_disable(struct clk *clk) +{ + __u16 regval16; + __u32 regval32; + + if (clk->enable_reg == 0) + return; + + if (clk->flags & ENABLE_REG_32BIT) { + regval32 = omap_readl(clk->enable_reg); + regval32 &= ~(1 << clk->enable_bit); + omap_writel(regval32, clk->enable_reg); + } else { + regval16 = omap_readw(clk->enable_reg); + regval16 &= ~(1 << clk->enable_bit); + omap_writew(regval16, clk->enable_reg); + } +} + + +void __clk_unuse(struct clk *clk) +{ + if (clk->usecount > 0 && !(--clk->usecount)) { + __clk_disable(clk); + if (likely(clk->parent)) + __clk_unuse(clk->parent); + } +} + + +int __clk_use(struct clk *clk) +{ + int ret = 0; + if (clk->usecount++ == 0) { + if (likely(clk->parent)) + ret = __clk_use(clk->parent); + + if (unlikely(ret != 0)) { + clk->usecount--; + return ret; + } + + ret = __clk_enable(clk); + + if (unlikely(ret != 0) && clk->parent) { + __clk_unuse(clk->parent); + clk->usecount--; + } + } + + return ret; +} + + +int clk_enable(struct clk *clk) +{ + unsigned long flags; + int ret; + + spin_lock_irqsave(&clockfw_lock, flags); + ret = __clk_enable(clk); + spin_unlock_irqrestore(&clockfw_lock, flags); + return ret; +} +EXPORT_SYMBOL(clk_enable); + + +void clk_disable(struct clk *clk) +{ + unsigned long flags; + + spin_lock_irqsave(&clockfw_lock, flags); + __clk_disable(clk); + spin_unlock_irqrestore(&clockfw_lock, flags); +} +EXPORT_SYMBOL(clk_disable); + + +int clk_use(struct clk *clk) +{ + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&clockfw_lock, flags); + ret = __clk_use(clk); + spin_unlock_irqrestore(&clockfw_lock, flags); + return ret; +} +EXPORT_SYMBOL(clk_use); + + +void clk_unuse(struct clk *clk) +{ + unsigned long flags; + + spin_lock_irqsave(&clockfw_lock, flags); + __clk_unuse(clk); + spin_unlock_irqrestore(&clockfw_lock, flags); +} +EXPORT_SYMBOL(clk_unuse); + + +int clk_get_usecount(struct clk *clk) +{ + return clk->usecount; +} +EXPORT_SYMBOL(clk_get_usecount); + + +unsigned long clk_get_rate(struct clk *clk) +{ + return clk->rate; +} +EXPORT_SYMBOL(clk_get_rate); + + +static __u16 verify_ckctl_value(__u16 newval) +{ + /* This function checks for following limitations set + * by the hardware (all conditions must be true): + * DSPMMU_CK == DSP_CK or DSPMMU_CK == DSP_CK/2 + * ARM_CK >= TC_CK + * DSP_CK >= TC_CK + * DSPMMU_CK >= TC_CK + * + * In addition following rules are enforced: + * LCD_CK <= TC_CK + * ARMPER_CK <= TC_CK + * + * However, maximum frequencies are not checked for! + */ + __u8 per_exp; + __u8 lcd_exp; + __u8 arm_exp; + __u8 dsp_exp; + __u8 tc_exp; + __u8 dspmmu_exp; + + per_exp = (newval >> CKCTL_PERDIV_OFFSET) & 3; + lcd_exp = (newval >> CKCTL_LCDDIV_OFFSET) & 3; + arm_exp = (newval >> CKCTL_ARMDIV_OFFSET) & 3; + dsp_exp = (newval >> CKCTL_DSPDIV_OFFSET) & 3; + tc_exp = (newval >> CKCTL_TCDIV_OFFSET) & 3; + dspmmu_exp = (newval >> CKCTL_DSPMMUDIV_OFFSET) & 3; + + if (dspmmu_exp < dsp_exp) + dspmmu_exp = dsp_exp; + if (dspmmu_exp > dsp_exp+1) + dspmmu_exp = dsp_exp+1; + if (tc_exp < arm_exp) + tc_exp = arm_exp; + if (tc_exp < dspmmu_exp) + tc_exp = dspmmu_exp; + if (tc_exp > lcd_exp) + lcd_exp = tc_exp; + if (tc_exp > per_exp) + per_exp = tc_exp; + + newval &= 0xf000; + newval |= per_exp << CKCTL_PERDIV_OFFSET; + newval |= lcd_exp << CKCTL_LCDDIV_OFFSET; + newval |= arm_exp << CKCTL_ARMDIV_OFFSET; + newval |= dsp_exp << CKCTL_DSPDIV_OFFSET; + newval |= tc_exp << CKCTL_TCDIV_OFFSET; + newval |= dspmmu_exp << CKCTL_DSPMMUDIV_OFFSET; + + return newval; +} + + +static int calc_dsor_exp(struct clk *clk, unsigned long rate) +{ + /* Note: If target frequency is too low, this function will return 4, + * which is invalid value. Caller must check for this value and act + * accordingly. + * + * Note: This function does not check for following limitations set + * by the hardware (all conditions must be true): + * DSPMMU_CK == DSP_CK or DSPMMU_CK == DSP_CK/2 + * ARM_CK >= TC_CK + * DSP_CK >= TC_CK + * DSPMMU_CK >= TC_CK + */ + unsigned long realrate; + struct clk * parent; + unsigned dsor_exp; + + if (unlikely(!(clk->flags & RATE_CKCTL))) + return -EINVAL; + + parent = clk->parent; + if (unlikely(parent == 0)) + return -EIO; + + realrate = parent->rate; + for (dsor_exp=0; dsor_exp<4; dsor_exp++) { + if (realrate <= rate) + break; + + realrate /= 2; + } + + return dsor_exp; +} + +long clk_round_rate(struct clk *clk, unsigned long rate) +{ + int dsor_exp; + + if (clk->flags & RATE_FIXED) + return clk->rate; + + if (clk->flags & RATE_CKCTL) { + dsor_exp = calc_dsor_exp(clk, rate); + if (dsor_exp < 0) + return dsor_exp; + if (dsor_exp > 3) + dsor_exp = 3; + return clk->parent->rate / (1 << dsor_exp); + } + + if(clk->round_rate != 0) + return clk->round_rate(clk, rate); + + return clk->rate; +} +EXPORT_SYMBOL(clk_round_rate); + + +static void propagate_rate(struct clk * clk) +{ + struct clk ** clkp; + + for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) { + if (likely((*clkp)->parent != clk)) continue; + if (likely((*clkp)->recalc)) + (*clkp)->recalc(*clkp); + } +} + + +static int select_table_rate(struct clk * clk, unsigned long rate) +{ + /* Find the highest supported frequency <= rate and switch to it */ + struct mpu_rate * ptr; + + if (clk != &virtual_ck_mpu) + return -EINVAL; + + for (ptr = rate_table; ptr->rate; ptr++) { + if (ptr->xtal != ck_ref.rate) + continue; + + /* DPLL1 cannot be reprogrammed without risking system crash */ + if (likely(ck_dpll1.rate!=0) && ptr->pll_rate != ck_dpll1.rate) + continue; + + /* Can check only after xtal frequency check */ + if (ptr->rate <= rate) + break; + } + + if (!ptr->rate) + return -EINVAL; + + if (unlikely(ck_dpll1.rate == 0)) { + omap_writew(ptr->dpllctl_val, DPLL_CTL); + ck_dpll1.rate = ptr->pll_rate; + } + omap_writew(ptr->ckctl_val, ARM_CKCTL); + propagate_rate(&ck_dpll1); + return 0; +} + + +static long round_to_table_rate(struct clk * clk, unsigned long rate) +{ + /* Find the highest supported frequency <= rate */ + struct mpu_rate * ptr; + long highest_rate; + + if (clk != &virtual_ck_mpu) + return -EINVAL; + + highest_rate = -EINVAL; + + for (ptr = rate_table; ptr->rate; ptr++) { + if (ptr->xtal != ck_ref.rate) + continue; + + highest_rate = ptr->rate; + + /* Can check only after xtal frequency check */ + if (ptr->rate <= rate) + break; + } + + return highest_rate; +} + + +int clk_set_rate(struct clk *clk, unsigned long rate) +{ + int ret = -EINVAL; + int dsor_exp; + __u16 regval; + unsigned long flags; + + if (clk->flags & RATE_CKCTL) { + dsor_exp = calc_dsor_exp(clk, rate); + if (dsor_exp > 3) + dsor_exp = -EINVAL; + if (dsor_exp < 0) + return dsor_exp; + + spin_lock_irqsave(&clockfw_lock, flags); + regval = omap_readw(ARM_CKCTL); + regval &= ~(3 << clk->rate_offset); + regval |= dsor_exp << clk->rate_offset; + regval = verify_ckctl_value(regval); + omap_writew(regval, ARM_CKCTL); + clk->rate = clk->parent->rate / (1 << dsor_exp); + spin_unlock_irqrestore(&clockfw_lock, flags); + ret = 0; + } else if(clk->set_rate != 0) { + spin_lock_irqsave(&clockfw_lock, flags); + ret = clk->set_rate(clk, rate); + spin_unlock_irqrestore(&clockfw_lock, flags); + } + + if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES))) + propagate_rate(clk); + + return ret; +} +EXPORT_SYMBOL(clk_set_rate); + + +static unsigned calc_ext_dsor(unsigned long rate) +{ + unsigned dsor; + + /* MCLK and BCLK divisor selection is not linear: + * freq = 96MHz / dsor + * + * RATIO_SEL range: dsor <-> RATIO_SEL + * 0..6: (RATIO_SEL+2) <-> (dsor-2) + * 6..48: (8+(RATIO_SEL-6)*2) <-> ((dsor-8)/2+6) + * Minimum dsor is 2 and maximum is 96. Odd divisors starting from 9 + * can not be used. + */ + for (dsor = 2; dsor < 96; ++dsor) { + if ((dsor & 1) && dsor > 8) + continue; + if (rate >= 96000000 / dsor) + break; + } + return dsor; +} + + +static int set_ext_clk_rate(struct clk * clk, unsigned long rate) +{ + unsigned dsor; + __u16 ratio_bits; + + dsor = calc_ext_dsor(rate); + clk->rate = 96000000 / dsor; + if (dsor > 8) + ratio_bits = ((dsor - 8) / 2 + 6) << 2; + else + ratio_bits = (dsor - 2) << 2; + + ratio_bits |= omap_readw(clk->enable_reg) & ~0xfd; + omap_writew(ratio_bits, clk->enable_reg); + + return 0; +} + + +static long round_ext_clk_rate(struct clk * clk, unsigned long rate) +{ + return 96000000 / calc_ext_dsor(rate); +} + + +static void init_ext_clk(struct clk * clk) +{ + unsigned dsor; + __u16 ratio_bits; + + /* Determine current rate and ensure clock is based on 96MHz APLL */ + ratio_bits = omap_readw(clk->enable_reg) & ~1; + omap_writew(ratio_bits, clk->enable_reg); + + ratio_bits = (ratio_bits & 0xfc) >> 2; + if (ratio_bits > 6) + dsor = (ratio_bits - 6) * 2 + 8; + else + dsor = ratio_bits + 2; + + clk-> rate = 96000000 / dsor; +} + + +int clk_register(struct clk *clk) +{ + down(&clocks_sem); + list_add(&clk->node, &clocks); + if (clk->init) + clk->init(clk); + up(&clocks_sem); + return 0; +} +EXPORT_SYMBOL(clk_register); + +void clk_unregister(struct clk *clk) +{ + down(&clocks_sem); + list_del(&clk->node); + up(&clocks_sem); +} +EXPORT_SYMBOL(clk_unregister); + + + +int __init clk_init(void) +{ + struct clk ** clkp; + const struct omap_clock_config *info; + int crystal_type = 0; /* Default 12 MHz */ + + for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) { + if (((*clkp)->flags &CLOCK_IN_OMAP1510) && cpu_is_omap1510()) { + clk_register(*clkp); + continue; + } + + if (((*clkp)->flags &CLOCK_IN_OMAP16XX) && cpu_is_omap16xx()) { + clk_register(*clkp); + continue; + } + + if (((*clkp)->flags &CLOCK_IN_OMAP730) && cpu_is_omap730()) { + clk_register(*clkp); + continue; + } + } + + info = omap_get_config(OMAP_TAG_CLOCK, struct omap_clock_config); + if (info != NULL) { + if (!cpu_is_omap1510()) + crystal_type = info->system_clock_type; + } + +#if defined(CONFIG_ARCH_OMAP730) + ck_ref.rate = 13000000; +#elif defined(CONFIG_ARCH_OMAP16XX) + if (crystal_type == 2) + ck_ref.rate = 19200000; +#endif + + /* We want to be in syncronous scalable mode */ + omap_writew(0x1000, ARM_SYSST); + + /* Find the highest supported frequency and enable it */ + if (select_table_rate(&virtual_ck_mpu, ~0)) { + printk(KERN_ERR "System frequencies not set. Check your config.\n"); + /* Guess sane values (60MHz) */ + omap_writew(0x2290, DPLL_CTL); + omap_writew(0x1005, ARM_CKCTL); + ck_dpll1.rate = 60000000; + propagate_rate(&ck_dpll1); + printk(KERN_INFO "Clocking rate (xtal/DPLL1/MPU): %ld/%ld/%ld\n", + ck_ref.rate, ck_dpll1.rate, arm_ck.rate); + } + + /* Cache rates for clocks connected to ck_ref (not dpll1) */ + propagate_rate(&ck_ref); + +#ifdef CONFIG_MACH_OMAP_PERSEUS2 + /* Select slicer output as OMAP input clock */ + omap_writew(omap_readw(OMAP730_PCC_UPLD_CTRL) & ~0x1, OMAP730_PCC_UPLD_CTRL); +#endif + + /* Turn off DSP and ARM_TIMXO. Make sure ARM_INTHCK is not divided */ + omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL); + + /* Put DSP/MPUI into reset until needed */ + omap_writew(0, ARM_RSTCT1); + omap_writew(1, ARM_RSTCT2); + omap_writew(0x400, ARM_IDLECT1); + + /* + * According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8) + * of the ARM_IDLECT2 register must be set to zero. The power-on + * default value of this bit is one. + */ + omap_writew(0x0000, ARM_IDLECT2); /* Turn LCD clock off also */ + + /* + * Only enable those clocks we will need, let the drivers + * enable other clocks as necessary + */ + clk_use(&armper_ck); + clk_use(&armxor_ck); + clk_use(&armtim_ck); + + if (cpu_is_omap1510()) + clk_enable(&arm_gpio_ck); + + return 0; +} |
