+++ /dev/null
-/*
- * linux/arch/arm/mach-at91/clock.c
- *
- * Copyright (C) 2005 David Brownell
- * Copyright (C) 2005 Ivan Kokshaysky
- *
- * 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.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <linux/debugfs.h>
-#include <linux/seq_file.h>
-#include <linux/list.h>
-#include <linux/errno.h>
-#include <linux/err.h>
-#include <linux/spinlock.h>
-#include <linux/delay.h>
-#include <linux/clk.h>
-#include <linux/io.h>
-#include <linux/of_address.h>
-#include <linux/clk/at91_pmc.h>
-
-#include <mach/hardware.h>
-#include <mach/cpu.h>
-
-#include <asm/proc-fns.h>
-
-#include "clock.h"
-#include "generic.h"
-
-void __iomem *at91_pmc_base;
-EXPORT_SYMBOL_GPL(at91_pmc_base);
-
-/*
- * There's a lot more which can be done with clocks, including cpufreq
- * integration, slow clock mode support (for system suspend), letting
- * PLLB be used at other rates (on boards that don't need USB), etc.
- */
-
-#define clk_is_primary(x) ((x)->type & CLK_TYPE_PRIMARY)
-#define clk_is_programmable(x) ((x)->type & CLK_TYPE_PROGRAMMABLE)
-#define clk_is_peripheral(x) ((x)->type & CLK_TYPE_PERIPHERAL)
-#define clk_is_sys(x) ((x)->type & CLK_TYPE_SYSTEM)
-
-
-/*
- * Chips have some kind of clocks : group them by functionality
- */
-#define cpu_has_utmi() ( cpu_is_at91sam9rl() \
- || cpu_is_at91sam9g45() \
- || cpu_is_at91sam9x5() \
- || cpu_is_sama5d3())
-
-#define cpu_has_1056M_plla() (cpu_is_sama5d3())
-
-#define cpu_has_800M_plla() ( cpu_is_at91sam9g20() \
- || cpu_is_at91sam9g45() \
- || cpu_is_at91sam9x5() \
- || cpu_is_at91sam9n12())
-
-#define cpu_has_300M_plla() (cpu_is_at91sam9g10())
-
-#define cpu_has_240M_plla() (cpu_is_at91sam9261() \
- || cpu_is_at91sam9263() \
- || cpu_is_at91sam9rl())
-
-#define cpu_has_210M_plla() (cpu_is_at91sam9260())
-
-#define cpu_has_pllb() (!(cpu_is_at91sam9rl() \
- || cpu_is_at91sam9g45() \
- || cpu_is_at91sam9x5() \
- || cpu_is_sama5d3()))
-
-#define cpu_has_upll() (cpu_is_at91sam9g45() \
- || cpu_is_at91sam9x5() \
- || cpu_is_sama5d3())
-
-/* USB host HS & FS */
-#define cpu_has_uhp() (!cpu_is_at91sam9rl())
-
-/* USB device FS only */
-#define cpu_has_udpfs() (!(cpu_is_at91sam9rl() \
- || cpu_is_at91sam9g45() \
- || cpu_is_at91sam9x5() \
- || cpu_is_sama5d3()))
-
-#define cpu_has_plladiv2() (cpu_is_at91sam9g45() \
- || cpu_is_at91sam9x5() \
- || cpu_is_at91sam9n12() \
- || cpu_is_sama5d3())
-
-#define cpu_has_mdiv3() (cpu_is_at91sam9g45() \
- || cpu_is_at91sam9x5() \
- || cpu_is_at91sam9n12() \
- || cpu_is_sama5d3())
-
-#define cpu_has_alt_prescaler() (cpu_is_at91sam9x5() \
- || cpu_is_at91sam9n12() \
- || cpu_is_sama5d3())
-
-static LIST_HEAD(clocks);
-static DEFINE_SPINLOCK(clk_lock);
-
-static u32 at91_pllb_usb_init;
-
-/*
- * Four primary clock sources: two crystal oscillators (32K, main), and
- * two PLLs. PLLA usually runs the master clock; and PLLB must run at
- * 48 MHz (unless no USB function clocks are needed). The main clock and
- * both PLLs are turned off to run in "slow clock mode" (system suspend).
- */
-static struct clk clk32k = {
- .name = "clk32k",
- .rate_hz = AT91_SLOW_CLOCK,
- .users = 1, /* always on */
- .id = 0,
- .type = CLK_TYPE_PRIMARY,
-};
-static struct clk main_clk = {
- .name = "main",
- .pmc_mask = AT91_PMC_MOSCS, /* in PMC_SR */
- .id = 1,
- .type = CLK_TYPE_PRIMARY,
-};
-static struct clk plla = {
- .name = "plla",
- .parent = &main_clk,
- .pmc_mask = AT91_PMC_LOCKA, /* in PMC_SR */
- .id = 2,
- .type = CLK_TYPE_PRIMARY | CLK_TYPE_PLL,
-};
-
-static void pllb_mode(struct clk *clk, int is_on)
-{
- u32 value;
-
- if (is_on) {
- is_on = AT91_PMC_LOCKB;
- value = at91_pllb_usb_init;
- } else
- value = 0;
-
- // REVISIT: Add work-around for AT91RM9200 Errata #26 ?
- at91_pmc_write(AT91_CKGR_PLLBR, value);
-
- do {
- cpu_relax();
- } while ((at91_pmc_read(AT91_PMC_SR) & AT91_PMC_LOCKB) != is_on);
-}
-
-static struct clk pllb = {
- .name = "pllb",
- .parent = &main_clk,
- .pmc_mask = AT91_PMC_LOCKB, /* in PMC_SR */
- .mode = pllb_mode,
- .id = 3,
- .type = CLK_TYPE_PRIMARY | CLK_TYPE_PLL,
-};
-
-static void pmc_sys_mode(struct clk *clk, int is_on)
-{
- if (is_on)
- at91_pmc_write(AT91_PMC_SCER, clk->pmc_mask);
- else
- at91_pmc_write(AT91_PMC_SCDR, clk->pmc_mask);
-}
-
-static void pmc_uckr_mode(struct clk *clk, int is_on)
-{
- unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
-
- if (is_on) {
- is_on = AT91_PMC_LOCKU;
- at91_pmc_write(AT91_CKGR_UCKR, uckr | clk->pmc_mask);
- } else
- at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(clk->pmc_mask));
-
- do {
- cpu_relax();
- } while ((at91_pmc_read(AT91_PMC_SR) & AT91_PMC_LOCKU) != is_on);
-}
-
-/* USB function clocks (PLLB must be 48 MHz) */
-static struct clk udpck = {
- .name = "udpck",
- .parent = &pllb,
- .mode = pmc_sys_mode,
-};
-struct clk utmi_clk = {
- .name = "utmi_clk",
- .parent = &main_clk,
- .pmc_mask = AT91_PMC_UPLLEN, /* in CKGR_UCKR */
- .mode = pmc_uckr_mode,
- .type = CLK_TYPE_PLL,
-};
-static struct clk uhpck = {
- .name = "uhpck",
- /*.parent = ... we choose parent at runtime */
- .mode = pmc_sys_mode,
-};
-
-
-/*
- * The master clock is divided from the CPU clock (by 1-4). It's used for
- * memory, interfaces to on-chip peripherals, the AIC, and sometimes more
- * (e.g baud rate generation). It's sourced from one of the primary clocks.
- */
-struct clk mck = {
- .name = "mck",
- .pmc_mask = AT91_PMC_MCKRDY, /* in PMC_SR */
-};
-
-static void pmc_periph_mode(struct clk *clk, int is_on)
-{
- u32 regval = 0;
-
- /*
- * With sama5d3 devices, we are managing clock division so we have to
- * use the Peripheral Control Register introduced from at91sam9x5
- * devices.
- */
- if (cpu_is_sama5d3()) {
- regval |= AT91_PMC_PCR_CMD; /* write command */
- regval |= clk->pid & AT91_PMC_PCR_PID; /* peripheral selection */
- regval |= AT91_PMC_PCR_DIV(clk->div);
- if (is_on)
- regval |= AT91_PMC_PCR_EN; /* enable clock */
- at91_pmc_write(AT91_PMC_PCR, regval);
- } else {
- if (is_on)
- at91_pmc_write(AT91_PMC_PCER, clk->pmc_mask);
- else
- at91_pmc_write(AT91_PMC_PCDR, clk->pmc_mask);
- }
-}
-
-static struct clk __init *at91_css_to_clk(unsigned long css)
-{
- switch (css) {
- case AT91_PMC_CSS_SLOW:
- return &clk32k;
- case AT91_PMC_CSS_MAIN:
- return &main_clk;
- case AT91_PMC_CSS_PLLA:
- return &plla;
- case AT91_PMC_CSS_PLLB:
- if (cpu_has_upll())
- /* CSS_PLLB == CSS_UPLL */
- return &utmi_clk;
- else if (cpu_has_pllb())
- return &pllb;
- break;
- /* alternate PMC: can use master clock */
- case AT91_PMC_CSS_MASTER:
- return &mck;
- }
-
- return NULL;
-}
-
-static int pmc_prescaler_divider(u32 reg)
-{
- if (cpu_has_alt_prescaler()) {
- return 1 << ((reg & AT91_PMC_ALT_PRES) >> PMC_ALT_PRES_OFFSET);
- } else {
- return 1 << ((reg & AT91_PMC_PRES) >> PMC_PRES_OFFSET);
- }
-}
-
-static void __clk_enable(struct clk *clk)
-{
- if (clk->parent)
- __clk_enable(clk->parent);
- if (clk->users++ == 0 && clk->mode)
- clk->mode(clk, 1);
-}
-
-int clk_enable(struct clk *clk)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&clk_lock, flags);
- __clk_enable(clk);
- spin_unlock_irqrestore(&clk_lock, flags);
- return 0;
-}
-EXPORT_SYMBOL(clk_enable);
-
-static void __clk_disable(struct clk *clk)
-{
- BUG_ON(clk->users == 0);
- if (--clk->users == 0 && clk->mode)
- clk->mode(clk, 0);
- if (clk->parent)
- __clk_disable(clk->parent);
-}
-
-void clk_disable(struct clk *clk)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&clk_lock, flags);
- __clk_disable(clk);
- spin_unlock_irqrestore(&clk_lock, flags);
-}
-EXPORT_SYMBOL(clk_disable);
-
-unsigned long clk_get_rate(struct clk *clk)
-{
- unsigned long flags;
- unsigned long rate;
-
- spin_lock_irqsave(&clk_lock, flags);
- for (;;) {
- rate = clk->rate_hz;
- if (rate || !clk->parent)
- break;
- clk = clk->parent;
- }
- spin_unlock_irqrestore(&clk_lock, flags);
- return rate;
-}
-EXPORT_SYMBOL(clk_get_rate);
-
-/*------------------------------------------------------------------------*/
-
-/*
- * For now, only the programmable clocks support reparenting (MCK could
- * do this too, with care) or rate changing (the PLLs could do this too,
- * ditto MCK but that's more for cpufreq). Drivers may reparent to get
- * a better rate match; we don't.
- */
-
-long clk_round_rate(struct clk *clk, unsigned long rate)
-{
- unsigned long flags;
- unsigned prescale;
- unsigned long actual;
- unsigned long prev = ULONG_MAX;
-
- if (!clk_is_programmable(clk))
- return -EINVAL;
- spin_lock_irqsave(&clk_lock, flags);
-
- actual = clk->parent->rate_hz;
- for (prescale = 0; prescale < 7; prescale++) {
- if (actual > rate)
- prev = actual;
-
- if (actual && actual <= rate) {
- if ((prev - rate) < (rate - actual)) {
- actual = prev;
- prescale--;
- }
- break;
- }
- actual >>= 1;
- }
-
- spin_unlock_irqrestore(&clk_lock, flags);
- return (prescale < 7) ? actual : -ENOENT;
-}
-EXPORT_SYMBOL(clk_round_rate);
-
-int clk_set_rate(struct clk *clk, unsigned long rate)
-{
- unsigned long flags;
- unsigned prescale;
- unsigned long prescale_offset, css_mask;
- unsigned long actual;
-
- if (!clk_is_programmable(clk))
- return -EINVAL;
- if (clk->users)
- return -EBUSY;
-
- if (cpu_has_alt_prescaler()) {
- prescale_offset = PMC_ALT_PRES_OFFSET;
- css_mask = AT91_PMC_ALT_PCKR_CSS;
- } else {
- prescale_offset = PMC_PRES_OFFSET;
- css_mask = AT91_PMC_CSS;
- }
-
- spin_lock_irqsave(&clk_lock, flags);
-
- actual = clk->parent->rate_hz;
- for (prescale = 0; prescale < 7; prescale++) {
- if (actual && actual <= rate) {
- u32 pckr;
-
- pckr = at91_pmc_read(AT91_PMC_PCKR(clk->id));
- pckr &= css_mask; /* keep clock selection */
- pckr |= prescale << prescale_offset;
- at91_pmc_write(AT91_PMC_PCKR(clk->id), pckr);
- clk->rate_hz = actual;
- break;
- }
- actual >>= 1;
- }
-
- spin_unlock_irqrestore(&clk_lock, flags);
- return (prescale < 7) ? actual : -ENOENT;
-}
-EXPORT_SYMBOL(clk_set_rate);
-
-struct clk *clk_get_parent(struct clk *clk)
-{
- return clk->parent;
-}
-EXPORT_SYMBOL(clk_get_parent);
-
-int clk_set_parent(struct clk *clk, struct clk *parent)
-{
- unsigned long flags;
-
- if (clk->users)
- return -EBUSY;
- if (!clk_is_primary(parent) || !clk_is_programmable(clk))
- return -EINVAL;
-
- if (cpu_is_at91sam9rl() && parent->id == AT91_PMC_CSS_PLLB)
- return -EINVAL;
-
- spin_lock_irqsave(&clk_lock, flags);
-
- clk->rate_hz = parent->rate_hz;
- clk->parent = parent;
- at91_pmc_write(AT91_PMC_PCKR(clk->id), parent->id);
-
- spin_unlock_irqrestore(&clk_lock, flags);
- return 0;
-}
-EXPORT_SYMBOL(clk_set_parent);
-
-/* establish PCK0..PCKN parentage and rate */
-static void __init init_programmable_clock(struct clk *clk)
-{
- struct clk *parent;
- u32 pckr;
- unsigned int css_mask;
-
- if (cpu_has_alt_prescaler())
- css_mask = AT91_PMC_ALT_PCKR_CSS;
- else
- css_mask = AT91_PMC_CSS;
-
- pckr = at91_pmc_read(AT91_PMC_PCKR(clk->id));
- parent = at91_css_to_clk(pckr & css_mask);
- clk->parent = parent;
- clk->rate_hz = parent->rate_hz / pmc_prescaler_divider(pckr);
-}
-
-/*------------------------------------------------------------------------*/
-
-#ifdef CONFIG_DEBUG_FS
-
-static int at91_clk_show(struct seq_file *s, void *unused)
-{
- u32 scsr, pcsr, pcsr1 = 0, uckr = 0, sr;
- struct clk *clk;
-
- scsr = at91_pmc_read(AT91_PMC_SCSR);
- pcsr = at91_pmc_read(AT91_PMC_PCSR);
- if (cpu_is_sama5d3())
- pcsr1 = at91_pmc_read(AT91_PMC_PCSR1);
- sr = at91_pmc_read(AT91_PMC_SR);
- seq_printf(s, "SCSR = %8x\n", scsr);
- seq_printf(s, "PCSR = %8x\n", pcsr);
- if (cpu_is_sama5d3())
- seq_printf(s, "PCSR1 = %8x\n", pcsr1);
- seq_printf(s, "MOR = %8x\n", at91_pmc_read(AT91_CKGR_MOR));
- seq_printf(s, "MCFR = %8x\n", at91_pmc_read(AT91_CKGR_MCFR));
- seq_printf(s, "PLLA = %8x\n", at91_pmc_read(AT91_CKGR_PLLAR));
- if (cpu_has_pllb())
- seq_printf(s, "PLLB = %8x\n", at91_pmc_read(AT91_CKGR_PLLBR));
- if (cpu_has_utmi()) {
- uckr = at91_pmc_read(AT91_CKGR_UCKR);
- seq_printf(s, "UCKR = %8x\n", uckr);
- }
- seq_printf(s, "MCKR = %8x\n", at91_pmc_read(AT91_PMC_MCKR));
- if (cpu_has_upll() || cpu_is_at91sam9n12())
- seq_printf(s, "USB = %8x\n", at91_pmc_read(AT91_PMC_USB));
- seq_printf(s, "SR = %8x\n", sr);
-
- seq_printf(s, "\n");
-
- list_for_each_entry(clk, &clocks, node) {
- char *state;
-
- if (clk->mode == pmc_sys_mode) {
- state = (scsr & clk->pmc_mask) ? "on" : "off";
- } else if (clk->mode == pmc_periph_mode) {
- if (cpu_is_sama5d3()) {
- u32 pmc_mask = 1 << (clk->pid % 32);
-
- if (clk->pid > 31)
- state = (pcsr1 & pmc_mask) ? "on" : "off";
- else
- state = (pcsr & pmc_mask) ? "on" : "off";
- } else {
- state = (pcsr & clk->pmc_mask) ? "on" : "off";
- }
- } else if (clk->mode == pmc_uckr_mode) {
- state = (uckr & clk->pmc_mask) ? "on" : "off";
- } else if (clk->pmc_mask) {
- state = (sr & clk->pmc_mask) ? "on" : "off";
- } else if (clk == &clk32k || clk == &main_clk) {
- state = "on";
- } else {
- state = "";
- }
-
- seq_printf(s, "%-10s users=%2d %-3s %9lu Hz %s\n",
- clk->name, clk->users, state, clk_get_rate(clk),
- clk->parent ? clk->parent->name : "");
- }
- return 0;
-}
-
-static int at91_clk_open(struct inode *inode, struct file *file)
-{
- return single_open(file, at91_clk_show, NULL);
-}
-
-static const struct file_operations at91_clk_operations = {
- .open = at91_clk_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int __init at91_clk_debugfs_init(void)
-{
- /* /sys/kernel/debug/at91_clk */
- (void) debugfs_create_file("at91_clk", S_IFREG | S_IRUGO, NULL, NULL, &at91_clk_operations);
-
- return 0;
-}
-postcore_initcall(at91_clk_debugfs_init);
-
-#endif
-
-/*------------------------------------------------------------------------*/
-
-/* Register a new clock */
-static void __init at91_clk_add(struct clk *clk)
-{
- list_add_tail(&clk->node, &clocks);
-
- clk->cl.con_id = clk->name;
- clk->cl.clk = clk;
- clkdev_add(&clk->cl);
-}
-
-int __init clk_register(struct clk *clk)
-{
- if (clk_is_peripheral(clk)) {
- if (!clk->parent)
- clk->parent = &mck;
- if (cpu_is_sama5d3())
- clk->rate_hz = DIV_ROUND_UP(clk->parent->rate_hz,
- 1 << clk->div);
- clk->mode = pmc_periph_mode;
- }
- else if (clk_is_sys(clk)) {
- clk->parent = &mck;
- clk->mode = pmc_sys_mode;
- }
- else if (clk_is_programmable(clk)) {
- clk->mode = pmc_sys_mode;
- init_programmable_clock(clk);
- }
-
- at91_clk_add(clk);
-
- return 0;
-}
-
-/*------------------------------------------------------------------------*/
-
-static u32 __init at91_pll_rate(struct clk *pll, u32 freq, u32 reg)
-{
- unsigned mul, div;
-
- div = reg & 0xff;
- if (cpu_is_sama5d3())
- mul = AT91_PMC3_MUL_GET(reg);
- else
- mul = AT91_PMC_MUL_GET(reg);
-
- if (div && mul) {
- freq /= div;
- freq *= mul + 1;
- } else
- freq = 0;
-
- return freq;
-}
-
-static u32 __init at91_usb_rate(struct clk *pll, u32 freq, u32 reg)
-{
- if (pll == &pllb && (reg & AT91_PMC_USB96M))
- return freq / 2;
- else if (pll == &utmi_clk || cpu_is_at91sam9n12())
- return freq / (1 + ((reg & AT91_PMC_OHCIUSBDIV) >> 8));
- else
- return freq;
-}
-
-static unsigned __init at91_pll_calc(unsigned main_freq, unsigned out_freq)
-{
- unsigned i, div = 0, mul = 0, diff = 1 << 30;
- unsigned ret = (out_freq > 155000000) ? 0xbe00 : 0x3e00;
-
- /* PLL output max 240 MHz (or 180 MHz per errata) */
- if (out_freq > 240000000)
- goto fail;
-
- for (i = 1; i < 256; i++) {
- int diff1;
- unsigned input, mul1;
-
- /*
- * PLL input between 1MHz and 32MHz per spec, but lower
- * frequences seem necessary in some cases so allow 100K.
- * Warning: some newer products need 2MHz min.
- */
- input = main_freq / i;
- if (cpu_is_at91sam9g20() && input < 2000000)
- continue;
- if (input < 100000)
- continue;
- if (input > 32000000)
- continue;
-
- mul1 = out_freq / input;
- if (cpu_is_at91sam9g20() && mul > 63)
- continue;
- if (mul1 > 2048)
- continue;
- if (mul1 < 2)
- goto fail;
-
- diff1 = out_freq - input * mul1;
- if (diff1 < 0)
- diff1 = -diff1;
- if (diff > diff1) {
- diff = diff1;
- div = i;
- mul = mul1;
- if (diff == 0)
- break;
- }
- }
- if (i == 256 && diff > (out_freq >> 5))
- goto fail;
- return ret | ((mul - 1) << 16) | div;
-fail:
- return 0;
-}
-
-static struct clk *const standard_pmc_clocks[] __initconst = {
- /* four primary clocks */
- &clk32k,
- &main_clk,
- &plla,
-
- /* MCK */
- &mck
-};
-
-/* PLLB generated USB full speed clock init */
-static void __init at91_pllb_usbfs_clock_init(unsigned long main_clock)
-{
- unsigned int reg;
-
- /*
- * USB clock init: choose 48 MHz PLLB value,
- * disable 48MHz clock during usb peripheral suspend.
- *
- * REVISIT: assumes MCK doesn't derive from PLLB!
- */
- uhpck.parent = &pllb;
-
- reg = at91_pllb_usb_init = at91_pll_calc(main_clock, 48000000 * 2);
- pllb.rate_hz = at91_pll_rate(&pllb, main_clock, at91_pllb_usb_init);
- if (cpu_is_at91rm9200()) {
- reg = at91_pllb_usb_init |= AT91_PMC_USB96M;
- uhpck.pmc_mask = AT91RM9200_PMC_UHP;
- udpck.pmc_mask = AT91RM9200_PMC_UDP;
- at91_pmc_write(AT91_PMC_SCER, AT91RM9200_PMC_MCKUDP);
- } else if (cpu_is_at91sam9260() || cpu_is_at91sam9261() ||
- cpu_is_at91sam9263() || cpu_is_at91sam9g20() ||
- cpu_is_at91sam9g10()) {
- reg = at91_pllb_usb_init |= AT91_PMC_USB96M;
- uhpck.pmc_mask = AT91SAM926x_PMC_UHP;
- udpck.pmc_mask = AT91SAM926x_PMC_UDP;
- } else if (cpu_is_at91sam9n12()) {
- /* Divider for USB clock is in USB clock register for 9n12 */
- reg = AT91_PMC_USBS_PLLB;
-
- /* For PLLB output 96M, set usb divider 2 (USBDIV + 1) */
- reg |= AT91_PMC_OHCIUSBDIV_2;
- at91_pmc_write(AT91_PMC_USB, reg);
-
- /* Still setup masks */
- uhpck.pmc_mask = AT91SAM926x_PMC_UHP;
- udpck.pmc_mask = AT91SAM926x_PMC_UDP;
- }
- at91_pmc_write(AT91_CKGR_PLLBR, 0);
-
- udpck.rate_hz = at91_usb_rate(&pllb, pllb.rate_hz, reg);
- uhpck.rate_hz = at91_usb_rate(&pllb, pllb.rate_hz, reg);
-}
-
-/* UPLL generated USB full speed clock init */
-static void __init at91_upll_usbfs_clock_init(unsigned long main_clock)
-{
- /*
- * USB clock init: choose 480 MHz from UPLL,
- */
- unsigned int usbr = AT91_PMC_USBS_UPLL;
-
- /* Setup divider by 10 to reach 48 MHz */
- usbr |= ((10 - 1) << 8) & AT91_PMC_OHCIUSBDIV;
-
- at91_pmc_write(AT91_PMC_USB, usbr);
-
- /* Now set uhpck values */
- uhpck.parent = &utmi_clk;
- uhpck.pmc_mask = AT91SAM926x_PMC_UHP;
- uhpck.rate_hz = at91_usb_rate(&utmi_clk, utmi_clk.rate_hz, usbr);
-}
-
-static int __init at91_pmc_init(unsigned long main_clock)
-{
- unsigned tmp, freq, mckr;
- int i;
- int pll_overclock = false;
-
- /*
- * When the bootloader initialized the main oscillator correctly,
- * there's no problem using the cycle counter. But if it didn't,
- * or when using oscillator bypass mode, we must be told the speed
- * of the main clock.
- */
- if (!main_clock) {
- do {
- tmp = at91_pmc_read(AT91_CKGR_MCFR);
- } while (!(tmp & AT91_PMC_MAINRDY));
- main_clock = (tmp & AT91_PMC_MAINF) * (AT91_SLOW_CLOCK / 16);
- }
- main_clk.rate_hz = main_clock;
-
- /* report if PLLA is more than mildly overclocked */
- plla.rate_hz = at91_pll_rate(&plla, main_clock, at91_pmc_read(AT91_CKGR_PLLAR));
- if (cpu_has_1056M_plla()) {
- if (plla.rate_hz > 1056000000)
- pll_overclock = true;
- } else if (cpu_has_800M_plla()) {
- if (plla.rate_hz > 800000000)
- pll_overclock = true;
- } else if (cpu_has_300M_plla()) {
- if (plla.rate_hz > 300000000)
- pll_overclock = true;
- } else if (cpu_has_240M_plla()) {
- if (plla.rate_hz > 240000000)
- pll_overclock = true;
- } else if (cpu_has_210M_plla()) {
- if (plla.rate_hz > 210000000)
- pll_overclock = true;
- } else {
- if (plla.rate_hz > 209000000)
- pll_overclock = true;
- }
- if (pll_overclock)
- pr_info("Clocks: PLLA overclocked, %ld MHz\n", plla.rate_hz / 1000000);
-
- if (cpu_has_plladiv2()) {
- mckr = at91_pmc_read(AT91_PMC_MCKR);
- plla.rate_hz /= (1 << ((mckr & AT91_PMC_PLLADIV2) >> 12)); /* plla divisor by 2 */
- }
-
- if (!cpu_has_pllb() && cpu_has_upll()) {
- /* setup UTMI clock as the fourth primary clock
- * (instead of pllb) */
- utmi_clk.type |= CLK_TYPE_PRIMARY;
- utmi_clk.id = 3;
- }
-
-
- /*
- * USB HS clock init
- */
- if (cpu_has_utmi()) {
- /*
- * multiplier is hard-wired to 40
- * (obtain the USB High Speed 480 MHz when input is 12 MHz)
- */
- utmi_clk.rate_hz = 40 * utmi_clk.parent->rate_hz;
-
- /* UTMI bias and PLL are managed at the same time */
- if (cpu_has_upll())
- utmi_clk.pmc_mask |= AT91_PMC_BIASEN;
- }
-
- /*
- * USB FS clock init
- */
- if (cpu_has_pllb())
- at91_pllb_usbfs_clock_init(main_clock);
- if (cpu_has_upll())
- /* assumes that we choose UPLL for USB and not PLLA */
- at91_upll_usbfs_clock_init(main_clock);
-
- /*
- * MCK and CPU derive from one of those primary clocks.
- * For now, assume this parentage won't change.
- */
- mckr = at91_pmc_read(AT91_PMC_MCKR);
- mck.parent = at91_css_to_clk(mckr & AT91_PMC_CSS);
- freq = mck.parent->rate_hz;
- freq /= pmc_prescaler_divider(mckr); /* prescale */
- if (cpu_is_at91rm9200()) {
- mck.rate_hz = freq / (1 + ((mckr & AT91_PMC_MDIV) >> 8)); /* mdiv */
- } else if (cpu_is_at91sam9g20()) {
- mck.rate_hz = (mckr & AT91_PMC_MDIV) ?
- freq / ((mckr & AT91_PMC_MDIV) >> 7) : freq; /* mdiv ; (x >> 7) = ((x >> 8) * 2) */
- if (mckr & AT91_PMC_PDIV)
- freq /= 2; /* processor clock division */
- } else if (cpu_has_mdiv3()) {
- mck.rate_hz = (mckr & AT91_PMC_MDIV) == AT91SAM9_PMC_MDIV_3 ?
- freq / 3 : freq / (1 << ((mckr & AT91_PMC_MDIV) >> 8)); /* mdiv */
- } else {
- mck.rate_hz = freq / (1 << ((mckr & AT91_PMC_MDIV) >> 8)); /* mdiv */
- }
-
- if (cpu_has_alt_prescaler()) {
- /* Programmable clocks can use MCK */
- mck.type |= CLK_TYPE_PRIMARY;
- mck.id = 4;
- }
-
- /* Register the PMC's standard clocks */
- for (i = 0; i < ARRAY_SIZE(standard_pmc_clocks); i++)
- at91_clk_add(standard_pmc_clocks[i]);
-
- if (cpu_has_pllb())
- at91_clk_add(&pllb);
-
- if (cpu_has_uhp())
- at91_clk_add(&uhpck);
-
- if (cpu_has_udpfs())
- at91_clk_add(&udpck);
-
- if (cpu_has_utmi())
- at91_clk_add(&utmi_clk);
-
- /* MCK and CPU clock are "always on" */
- clk_enable(&mck);
-
- printk("Clocks: CPU %u MHz, master %u MHz, main %u.%03u MHz\n",
- freq / 1000000, (unsigned) mck.rate_hz / 1000000,
- (unsigned) main_clock / 1000000,
- ((unsigned) main_clock % 1000000) / 1000);
-
- return 0;
-}
-
-#if defined(CONFIG_OF)
-static struct of_device_id pmc_ids[] = {
- { .compatible = "atmel,at91rm9200-pmc" },
- { .compatible = "atmel,at91sam9260-pmc" },
- { .compatible = "atmel,at91sam9g45-pmc" },
- { .compatible = "atmel,at91sam9n12-pmc" },
- { .compatible = "atmel,at91sam9x5-pmc" },
- { .compatible = "atmel,sama5d3-pmc" },
- { /*sentinel*/ }
-};
-
-static struct of_device_id osc_ids[] = {
- { .compatible = "atmel,osc" },
- { /*sentinel*/ }
-};
-
-int __init at91_dt_clock_init(void)
-{
- struct device_node *np;
- u32 main_clock = 0;
-
- np = of_find_matching_node(NULL, pmc_ids);
- if (!np)
- panic("unable to find compatible pmc node in dtb\n");
-
- at91_pmc_base = of_iomap(np, 0);
- if (!at91_pmc_base)
- panic("unable to map pmc cpu registers\n");
-
- of_node_put(np);
-
- /* retrieve the freqency of fixed clocks from device tree */
- np = of_find_matching_node(NULL, osc_ids);
- if (np) {
- u32 rate;
- if (!of_property_read_u32(np, "clock-frequency", &rate))
- main_clock = rate;
- }
-
- of_node_put(np);
-
- return at91_pmc_init(main_clock);
-}
-#endif
-
-int __init at91_clock_init(unsigned long main_clock)
-{
- at91_pmc_base = ioremap(AT91_PMC, 256);
- if (!at91_pmc_base)
- panic("Impossible to ioremap AT91_PMC 0x%x\n", AT91_PMC);
-
- return at91_pmc_init(main_clock);
-}
-
-/*
- * Several unused clocks may be active. Turn them off.
- */
-static int __init at91_clock_reset(void)
-{
- unsigned long pcdr = 0;
- unsigned long pcdr1 = 0;
- unsigned long scdr = 0;
- struct clk *clk;
-
- list_for_each_entry(clk, &clocks, node) {
- if (clk->users > 0)
- continue;
-
- if (clk->mode == pmc_periph_mode) {
- if (cpu_is_sama5d3()) {
- u32 pmc_mask = 1 << (clk->pid % 32);
-
- if (clk->pid > 31)
- pcdr1 |= pmc_mask;
- else
- pcdr |= pmc_mask;
- } else
- pcdr |= clk->pmc_mask;
- }
-
- if (clk->mode == pmc_sys_mode)
- scdr |= clk->pmc_mask;
-
- pr_debug("Clocks: disable unused %s\n", clk->name);
- }
-
- at91_pmc_write(AT91_PMC_SCDR, scdr);
- at91_pmc_write(AT91_PMC_PCDR, pcdr);
- if (cpu_is_sama5d3())
- at91_pmc_write(AT91_PMC_PCDR1, pcdr1);
-
- return 0;
-}
-late_initcall(at91_clock_reset);
-
-void at91sam9_idle(void)
-{
- at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
- cpu_do_idle();
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff