![Russell King](/assets/img/avatar_default.png)
Another stupid instance of "return -1"-ism. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
1488 lines
38 KiB
C
1488 lines
38 KiB
C
/*
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*
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* arch/arm/mach-u300/clock.c
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*
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*
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* Copyright (C) 2007-2009 ST-Ericsson AB
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* License terms: GNU General Public License (GPL) version 2
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* Define clocks in the app platform.
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* Author: Linus Walleij <linus.walleij@stericsson.com>
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* Author: Jonas Aaberg <jonas.aberg@stericsson.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/string.h>
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#include <linux/clk.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/timer.h>
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#include <linux/io.h>
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#include <asm/clkdev.h>
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#include <mach/hardware.h>
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#include <mach/syscon.h>
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#include "clock.h"
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/*
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* TODO:
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* - move all handling of the CCR register into this file and create
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* a spinlock for the CCR register
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* - switch to the clkdevice lookup mechanism that maps clocks to
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* device ID:s instead when it becomes available in kernel 2.6.29.
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* - implement rate get/set for all clocks that need it.
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*/
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/*
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* Syscon clock I/O registers lock so clock requests don't collide
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* NOTE: this is a local lock only used to lock access to clock and
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* reset registers in syscon.
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*/
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static DEFINE_SPINLOCK(syscon_clkreg_lock);
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static DEFINE_SPINLOCK(syscon_resetreg_lock);
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/*
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* The clocking hierarchy currently looks like this.
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* NOTE: the idea is NOT to show how the clocks are routed on the chip!
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* The ideas is to show dependencies, so a clock higher up in the
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* hierarchy has to be on in order for another clock to be on. Now,
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* both CPU and DMA can actually be on top of the hierarchy, and that
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* is not modeled currently. Instead we have the backbone AMBA bus on
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* top. This bus cannot be programmed in any way but conceptually it
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* needs to be active for the bridges and devices to transport data.
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*
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* Please be aware that a few clocks are hw controlled, which mean that
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* the hw itself can turn on/off or change the rate of the clock when
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* needed!
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*
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* AMBA bus
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* |
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* +- CPU
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* +- NANDIF NAND Flash interface
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* +- SEMI Shared Memory interface
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* +- ISP Image Signal Processor (U335 only)
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* +- CDS (U335 only)
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* +- DMA Direct Memory Access Controller
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* +- AAIF APP/ACC Inteface (Mobile Scalable Link, MSL)
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* +- APEX
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* +- VIDEO_ENC AVE2/3 Video Encoder
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* +- XGAM Graphics Accelerator Controller
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* +- AHB
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* |
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* +- ahb:0 AHB Bridge
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* | |
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* | +- ahb:1 INTCON Interrupt controller
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* | +- ahb:3 MSPRO Memory Stick Pro controller
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* | +- ahb:4 EMIF External Memory interface
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* |
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* +- fast:0 FAST bridge
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* | |
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* | +- fast:1 MMCSD MMC/SD card reader controller
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* | +- fast:2 I2S0 PCM I2S channel 0 controller
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* | +- fast:3 I2S1 PCM I2S channel 1 controller
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* | +- fast:4 I2C0 I2C channel 0 controller
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* | +- fast:5 I2C1 I2C channel 1 controller
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* | +- fast:6 SPI SPI controller
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* | +- fast:7 UART1 Secondary UART (U335 only)
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* |
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* +- slow:0 SLOW bridge
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* |
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* +- slow:1 SYSCON (not possible to control)
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* +- slow:2 WDOG Watchdog
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* +- slow:3 UART0 primary UART
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* +- slow:4 TIMER_APP Application timer - used in Linux
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* +- slow:5 KEYPAD controller
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* +- slow:6 GPIO controller
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* +- slow:7 RTC controller
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* +- slow:8 BT Bus Tracer (not used currently)
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* +- slow:9 EH Event Handler (not used currently)
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* +- slow:a TIMER_ACC Access style timer (not used currently)
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* +- slow:b PPM (U335 only, what is that?)
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*/
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/*
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* Reset control functions. We remember if a block has been
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* taken out of reset and don't remove the reset assertion again
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* and vice versa. Currently we only remove resets so the
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* enablement function is defined out.
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*/
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static void syscon_block_reset_enable(struct clk *clk)
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{
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u16 val;
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unsigned long iflags;
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/* Not all blocks support resetting */
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if (!clk->res_reg || !clk->res_mask)
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return;
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spin_lock_irqsave(&syscon_resetreg_lock, iflags);
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val = readw(clk->res_reg);
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val |= clk->res_mask;
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writew(val, clk->res_reg);
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spin_unlock_irqrestore(&syscon_resetreg_lock, iflags);
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clk->reset = true;
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}
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static void syscon_block_reset_disable(struct clk *clk)
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{
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u16 val;
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unsigned long iflags;
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/* Not all blocks support resetting */
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if (!clk->res_reg || !clk->res_mask)
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return;
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spin_lock_irqsave(&syscon_resetreg_lock, iflags);
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val = readw(clk->res_reg);
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val &= ~clk->res_mask;
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writew(val, clk->res_reg);
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spin_unlock_irqrestore(&syscon_resetreg_lock, iflags);
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clk->reset = false;
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}
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int __clk_get(struct clk *clk)
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{
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u16 val;
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/* The MMC and MSPRO clocks need some special set-up */
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if (!strcmp(clk->name, "MCLK")) {
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/* Set default MMC clock divisor to 18.9 MHz */
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writew(0x0054U, U300_SYSCON_VBASE + U300_SYSCON_MMF0R);
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_MMCR);
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/* Disable the MMC feedback clock */
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val &= ~U300_SYSCON_MMCR_MMC_FB_CLK_SEL_ENABLE;
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/* Disable MSPRO frequency */
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val &= ~U300_SYSCON_MMCR_MSPRO_FREQSEL_ENABLE;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_MMCR);
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}
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if (!strcmp(clk->name, "MSPRO")) {
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_MMCR);
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/* Disable the MMC feedback clock */
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val &= ~U300_SYSCON_MMCR_MMC_FB_CLK_SEL_ENABLE;
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/* Enable MSPRO frequency */
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val |= U300_SYSCON_MMCR_MSPRO_FREQSEL_ENABLE;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_MMCR);
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}
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return 1;
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}
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EXPORT_SYMBOL(__clk_get);
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void __clk_put(struct clk *clk)
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{
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}
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EXPORT_SYMBOL(__clk_put);
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static void syscon_clk_disable(struct clk *clk)
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{
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unsigned long iflags;
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/* Don't touch the hardware controlled clocks */
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if (clk->hw_ctrld)
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return;
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spin_lock_irqsave(&syscon_clkreg_lock, iflags);
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writew(clk->clk_val, U300_SYSCON_VBASE + U300_SYSCON_SBCDR);
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spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
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}
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static void syscon_clk_enable(struct clk *clk)
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{
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unsigned long iflags;
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/* Don't touch the hardware controlled clocks */
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if (clk->hw_ctrld)
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return;
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spin_lock_irqsave(&syscon_clkreg_lock, iflags);
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writew(clk->clk_val, U300_SYSCON_VBASE + U300_SYSCON_SBCER);
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spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
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}
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static u16 syscon_clk_get_rate(void)
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{
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u16 val;
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unsigned long iflags;
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spin_lock_irqsave(&syscon_clkreg_lock, iflags);
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
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val &= U300_SYSCON_CCR_CLKING_PERFORMANCE_MASK;
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spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
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return val;
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}
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#ifdef CONFIG_MACH_U300_USE_I2S_AS_MASTER
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static void enable_i2s0_vcxo(void)
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{
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u16 val;
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unsigned long iflags;
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spin_lock_irqsave(&syscon_clkreg_lock, iflags);
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/* Set I2S0 to use the VCXO 26 MHz clock */
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
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val |= U300_SYSCON_CCR_TURN_VCXO_ON;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
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val |= U300_SYSCON_CCR_I2S0_USE_VCXO;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
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val |= U300_SYSCON_CEFR_I2S0_CLK_EN;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
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spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
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}
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static void enable_i2s1_vcxo(void)
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{
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u16 val;
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unsigned long iflags;
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spin_lock_irqsave(&syscon_clkreg_lock, iflags);
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/* Set I2S1 to use the VCXO 26 MHz clock */
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
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val |= U300_SYSCON_CCR_TURN_VCXO_ON;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
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val |= U300_SYSCON_CCR_I2S1_USE_VCXO;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
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val |= U300_SYSCON_CEFR_I2S1_CLK_EN;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
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spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
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}
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static void disable_i2s0_vcxo(void)
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{
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u16 val;
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unsigned long iflags;
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spin_lock_irqsave(&syscon_clkreg_lock, iflags);
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/* Disable I2S0 use of the VCXO 26 MHz clock */
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
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val &= ~U300_SYSCON_CCR_I2S0_USE_VCXO;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
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/* Deactivate VCXO if noone else is using VCXO */
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if (!(val & U300_SYSCON_CCR_I2S1_USE_VCXO))
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val &= ~U300_SYSCON_CCR_TURN_VCXO_ON;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
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val &= ~U300_SYSCON_CEFR_I2S0_CLK_EN;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
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spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
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}
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static void disable_i2s1_vcxo(void)
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{
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u16 val;
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unsigned long iflags;
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spin_lock_irqsave(&syscon_clkreg_lock, iflags);
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/* Disable I2S1 use of the VCXO 26 MHz clock */
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
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val &= ~U300_SYSCON_CCR_I2S1_USE_VCXO;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
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/* Deactivate VCXO if noone else is using VCXO */
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if (!(val & U300_SYSCON_CCR_I2S0_USE_VCXO))
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val &= ~U300_SYSCON_CCR_TURN_VCXO_ON;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
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val &= ~U300_SYSCON_CEFR_I2S0_CLK_EN;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
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spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
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}
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#endif /* CONFIG_MACH_U300_USE_I2S_AS_MASTER */
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static void syscon_clk_rate_set_mclk(unsigned long rate)
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{
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u16 val;
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u32 reg;
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unsigned long iflags;
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switch (rate) {
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case 18900000:
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val = 0x0054;
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break;
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case 20800000:
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val = 0x0044;
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break;
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case 23100000:
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val = 0x0043;
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break;
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case 26000000:
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val = 0x0033;
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break;
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case 29700000:
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val = 0x0032;
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break;
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case 34700000:
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val = 0x0022;
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break;
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case 41600000:
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val = 0x0021;
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break;
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case 52000000:
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val = 0x0011;
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break;
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case 104000000:
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val = 0x0000;
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break;
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default:
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printk(KERN_ERR "Trying to set MCLK to unknown speed! %ld\n",
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rate);
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return;
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}
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spin_lock_irqsave(&syscon_clkreg_lock, iflags);
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reg = readw(U300_SYSCON_VBASE + U300_SYSCON_MMF0R) &
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~U300_SYSCON_MMF0R_MASK;
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writew(reg | val, U300_SYSCON_VBASE + U300_SYSCON_MMF0R);
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spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
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}
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void syscon_clk_rate_set_cpuclk(unsigned long rate)
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{
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u16 val;
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unsigned long iflags;
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switch (rate) {
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case 13000000:
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val = U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER;
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break;
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case 52000000:
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val = U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE;
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break;
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case 104000000:
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val = U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH;
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break;
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case 208000000:
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val = U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST;
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break;
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default:
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return;
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}
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spin_lock_irqsave(&syscon_clkreg_lock, iflags);
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val |= readw(U300_SYSCON_VBASE + U300_SYSCON_CCR) &
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~U300_SYSCON_CCR_CLKING_PERFORMANCE_MASK ;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
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spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
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}
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EXPORT_SYMBOL(syscon_clk_rate_set_cpuclk);
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void clk_disable(struct clk *clk)
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{
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unsigned long iflags;
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spin_lock_irqsave(&clk->lock, iflags);
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if (clk->usecount > 0 && !(--clk->usecount)) {
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/* some blocks lack clocking registers and cannot be disabled */
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if (clk->disable)
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clk->disable(clk);
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if (likely((u32)clk->parent))
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clk_disable(clk->parent);
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}
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#ifdef CONFIG_MACH_U300_USE_I2S_AS_MASTER
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if (unlikely(!strcmp(clk->name, "I2S0")))
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disable_i2s0_vcxo();
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if (unlikely(!strcmp(clk->name, "I2S1")))
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disable_i2s1_vcxo();
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#endif
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spin_unlock_irqrestore(&clk->lock, iflags);
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}
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EXPORT_SYMBOL(clk_disable);
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int clk_enable(struct clk *clk)
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{
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int ret = 0;
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unsigned long iflags;
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spin_lock_irqsave(&clk->lock, iflags);
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if (clk->usecount++ == 0) {
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if (likely((u32)clk->parent))
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ret = clk_enable(clk->parent);
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if (unlikely(ret != 0))
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clk->usecount--;
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else {
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/* remove reset line (we never enable reset again) */
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syscon_block_reset_disable(clk);
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/* clocks without enable function are always on */
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if (clk->enable)
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clk->enable(clk);
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#ifdef CONFIG_MACH_U300_USE_I2S_AS_MASTER
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if (unlikely(!strcmp(clk->name, "I2S0")))
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enable_i2s0_vcxo();
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if (unlikely(!strcmp(clk->name, "I2S1")))
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enable_i2s1_vcxo();
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#endif
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}
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}
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spin_unlock_irqrestore(&clk->lock, iflags);
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return ret;
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}
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EXPORT_SYMBOL(clk_enable);
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/* Returns the clock rate in Hz */
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static unsigned long clk_get_rate_cpuclk(struct clk *clk)
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{
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u16 val;
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val = syscon_clk_get_rate();
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switch (val) {
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case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
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case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
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return 13000000;
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case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
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return 52000000;
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case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
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return 104000000;
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case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
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return 208000000;
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default:
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break;
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}
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return clk->rate;
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}
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static unsigned long clk_get_rate_ahb_clk(struct clk *clk)
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{
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u16 val;
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val = syscon_clk_get_rate();
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switch (val) {
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case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
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case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
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|
return 6500000;
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
|
|
return 26000000;
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
|
|
return 52000000;
|
|
default:
|
|
break;
|
|
}
|
|
return clk->rate;
|
|
|
|
}
|
|
|
|
static unsigned long clk_get_rate_emif_clk(struct clk *clk)
|
|
{
|
|
u16 val;
|
|
|
|
val = syscon_clk_get_rate();
|
|
|
|
switch (val) {
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
|
|
return 13000000;
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
|
|
return 52000000;
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
|
|
return 104000000;
|
|
default:
|
|
break;
|
|
}
|
|
return clk->rate;
|
|
|
|
}
|
|
|
|
static unsigned long clk_get_rate_xgamclk(struct clk *clk)
|
|
{
|
|
u16 val;
|
|
|
|
val = syscon_clk_get_rate();
|
|
|
|
switch (val) {
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
|
|
return 6500000;
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
|
|
return 26000000;
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
|
|
return 52000000;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return clk->rate;
|
|
}
|
|
|
|
static unsigned long clk_get_rate_mclk(struct clk *clk)
|
|
{
|
|
u16 val;
|
|
|
|
val = syscon_clk_get_rate();
|
|
|
|
switch (val) {
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
|
|
/*
|
|
* Here, the 208 MHz PLL gets shut down and the always
|
|
* on 13 MHz PLL used for RTC etc kicks into use
|
|
* instead.
|
|
*/
|
|
return 13000000;
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
|
|
{
|
|
/*
|
|
* This clock is under program control. The register is
|
|
* divided in two nybbles, bit 7-4 gives cycles-1 to count
|
|
* high, bit 3-0 gives cycles-1 to count low. Distribute
|
|
* these with no more than 1 cycle difference between
|
|
* low and high and add low and high to get the actual
|
|
* divisor. The base PLL is 208 MHz. Writing 0x00 will
|
|
* divide by 1 and 1 so the highest frequency possible
|
|
* is 104 MHz.
|
|
*
|
|
* e.g. 0x54 =>
|
|
* f = 208 / ((5+1) + (4+1)) = 208 / 11 = 18.9 MHz
|
|
*/
|
|
u16 val = readw(U300_SYSCON_VBASE + U300_SYSCON_MMF0R) &
|
|
U300_SYSCON_MMF0R_MASK;
|
|
switch (val) {
|
|
case 0x0054:
|
|
return 18900000;
|
|
case 0x0044:
|
|
return 20800000;
|
|
case 0x0043:
|
|
return 23100000;
|
|
case 0x0033:
|
|
return 26000000;
|
|
case 0x0032:
|
|
return 29700000;
|
|
case 0x0022:
|
|
return 34700000;
|
|
case 0x0021:
|
|
return 41600000;
|
|
case 0x0011:
|
|
return 52000000;
|
|
case 0x0000:
|
|
return 104000000;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return clk->rate;
|
|
}
|
|
|
|
static unsigned long clk_get_rate_i2s_i2c_spi(struct clk *clk)
|
|
{
|
|
u16 val;
|
|
|
|
val = syscon_clk_get_rate();
|
|
|
|
switch (val) {
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
|
|
return 13000000;
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
|
|
case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
|
|
return 26000000;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return clk->rate;
|
|
}
|
|
|
|
unsigned long clk_get_rate(struct clk *clk)
|
|
{
|
|
if (clk->get_rate)
|
|
return clk->get_rate(clk);
|
|
else
|
|
return clk->rate;
|
|
}
|
|
EXPORT_SYMBOL(clk_get_rate);
|
|
|
|
static unsigned long clk_round_rate_mclk(struct clk *clk, unsigned long rate)
|
|
{
|
|
if (rate >= 18900000)
|
|
return 18900000;
|
|
if (rate >= 20800000)
|
|
return 20800000;
|
|
if (rate >= 23100000)
|
|
return 23100000;
|
|
if (rate >= 26000000)
|
|
return 26000000;
|
|
if (rate >= 29700000)
|
|
return 29700000;
|
|
if (rate >= 34700000)
|
|
return 34700000;
|
|
if (rate >= 41600000)
|
|
return 41600000;
|
|
if (rate >= 52000000)
|
|
return 52000000;
|
|
return -EINVAL;
|
|
}
|
|
|
|
static unsigned long clk_round_rate_cpuclk(struct clk *clk, unsigned long rate)
|
|
{
|
|
if (rate >= 13000000)
|
|
return 13000000;
|
|
if (rate >= 52000000)
|
|
return 52000000;
|
|
if (rate >= 104000000)
|
|
return 104000000;
|
|
if (rate >= 208000000)
|
|
return 208000000;
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* This adjusts a requested rate to the closest exact rate
|
|
* a certain clock can provide. For a fixed clock it's
|
|
* mostly clk->rate.
|
|
*/
|
|
long clk_round_rate(struct clk *clk, unsigned long rate)
|
|
{
|
|
/* TODO: get apropriate switches for EMIFCLK, AHBCLK and MCLK */
|
|
/* Else default to fixed value */
|
|
|
|
if (clk->round_rate) {
|
|
return (long) clk->round_rate(clk, rate);
|
|
} else {
|
|
printk(KERN_ERR "clock: Failed to round rate of %s\n",
|
|
clk->name);
|
|
}
|
|
return (long) clk->rate;
|
|
}
|
|
EXPORT_SYMBOL(clk_round_rate);
|
|
|
|
static int clk_set_rate_mclk(struct clk *clk, unsigned long rate)
|
|
{
|
|
syscon_clk_rate_set_mclk(clk_round_rate(clk, rate));
|
|
return 0;
|
|
}
|
|
|
|
static int clk_set_rate_cpuclk(struct clk *clk, unsigned long rate)
|
|
{
|
|
syscon_clk_rate_set_cpuclk(clk_round_rate(clk, rate));
|
|
return 0;
|
|
}
|
|
|
|
int clk_set_rate(struct clk *clk, unsigned long rate)
|
|
{
|
|
/* TODO: set for EMIFCLK and AHBCLK */
|
|
/* Else assume the clock is fixed and fail */
|
|
if (clk->set_rate) {
|
|
return clk->set_rate(clk, rate);
|
|
} else {
|
|
printk(KERN_ERR "clock: Failed to set %s to %ld hz\n",
|
|
clk->name, rate);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(clk_set_rate);
|
|
|
|
/*
|
|
* Clock definitions. The clock parents are set to respective
|
|
* bridge and the clock framework makes sure that the clocks have
|
|
* parents activated and are brought out of reset when in use.
|
|
*
|
|
* Clocks that have hw_ctrld = true are hw controlled, and the hw
|
|
* can by itself turn these clocks on and off.
|
|
* So in other words, we don't really have to care about them.
|
|
*/
|
|
|
|
static struct clk amba_clk = {
|
|
.name = "AMBA",
|
|
.rate = 52000000, /* this varies! */
|
|
.hw_ctrld = true,
|
|
.reset = false,
|
|
};
|
|
|
|
/*
|
|
* These blocks are connected directly to the AMBA bus
|
|
* with no bridge.
|
|
*/
|
|
|
|
static struct clk cpu_clk = {
|
|
.name = "CPU",
|
|
.parent = &amba_clk,
|
|
.rate = 208000000, /* this varies! */
|
|
.hw_ctrld = true,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
|
|
.res_mask = U300_SYSCON_RRR_CPU_RESET_EN,
|
|
.set_rate = clk_set_rate_cpuclk,
|
|
.get_rate = clk_get_rate_cpuclk,
|
|
.round_rate = clk_round_rate_cpuclk,
|
|
};
|
|
|
|
static struct clk nandif_clk = {
|
|
.name = "NANDIF",
|
|
.parent = &amba_clk,
|
|
.hw_ctrld = false,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
|
|
.res_mask = U300_SYSCON_RRR_NANDIF_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_NANDIF_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
static struct clk semi_clk = {
|
|
.name = "SEMI",
|
|
.parent = &amba_clk,
|
|
.rate = 0, /* FIXME */
|
|
/* It is not possible to reset SEMI */
|
|
.hw_ctrld = false,
|
|
.reset = false,
|
|
.clk_val = U300_SYSCON_SBCER_SEMI_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
#ifdef CONFIG_MACH_U300_BS335
|
|
static struct clk isp_clk = {
|
|
.name = "ISP",
|
|
.parent = &amba_clk,
|
|
.rate = 0, /* FIXME */
|
|
.hw_ctrld = false,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
|
|
.res_mask = U300_SYSCON_RRR_ISP_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_ISP_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
static struct clk cds_clk = {
|
|
.name = "CDS",
|
|
.parent = &amba_clk,
|
|
.rate = 0, /* FIXME */
|
|
.hw_ctrld = false,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
|
|
.res_mask = U300_SYSCON_RRR_CDS_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_CDS_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
#endif
|
|
|
|
static struct clk dma_clk = {
|
|
.name = "DMA",
|
|
.parent = &amba_clk,
|
|
.rate = 52000000, /* this varies! */
|
|
.hw_ctrld = true,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
|
|
.res_mask = U300_SYSCON_RRR_DMAC_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_DMAC_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
static struct clk aaif_clk = {
|
|
.name = "AAIF",
|
|
.parent = &amba_clk,
|
|
.rate = 52000000, /* this varies! */
|
|
.hw_ctrld = true,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
|
|
.res_mask = U300_SYSCON_RRR_AAIF_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_AAIF_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
static struct clk apex_clk = {
|
|
.name = "APEX",
|
|
.parent = &amba_clk,
|
|
.rate = 0, /* FIXME */
|
|
.hw_ctrld = true,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
|
|
.res_mask = U300_SYSCON_RRR_APEX_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_APEX_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
static struct clk video_enc_clk = {
|
|
.name = "VIDEO_ENC",
|
|
.parent = &amba_clk,
|
|
.rate = 208000000, /* this varies! */
|
|
.hw_ctrld = false,
|
|
.reset = false,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
|
|
/* This has XGAM in the name but refers to the video encoder */
|
|
.res_mask = U300_SYSCON_RRR_XGAM_VC_SYNC_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_VIDEO_ENC_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
static struct clk xgam_clk = {
|
|
.name = "XGAMCLK",
|
|
.parent = &amba_clk,
|
|
.rate = 52000000, /* this varies! */
|
|
.hw_ctrld = false,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
|
|
.res_mask = U300_SYSCON_RRR_XGAM_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_XGAM_CLK_EN,
|
|
.get_rate = clk_get_rate_xgamclk,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
/* This clock is used to activate the video encoder */
|
|
static struct clk ahb_clk = {
|
|
.name = "AHB",
|
|
.parent = &amba_clk,
|
|
.rate = 52000000, /* this varies! */
|
|
.hw_ctrld = false, /* This one is set to false due to HW bug */
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
|
|
.res_mask = U300_SYSCON_RRR_AHB_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_AHB_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
.get_rate = clk_get_rate_ahb_clk,
|
|
};
|
|
|
|
|
|
/*
|
|
* Clocks on the AHB bridge
|
|
*/
|
|
|
|
static struct clk ahb_subsys_clk = {
|
|
.name = "AHB_SUBSYS",
|
|
.parent = &amba_clk,
|
|
.rate = 52000000, /* this varies! */
|
|
.hw_ctrld = true,
|
|
.reset = false,
|
|
.clk_val = U300_SYSCON_SBCER_AHB_SUBSYS_BRIDGE_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
.get_rate = clk_get_rate_ahb_clk,
|
|
};
|
|
|
|
static struct clk intcon_clk = {
|
|
.name = "INTCON",
|
|
.parent = &ahb_subsys_clk,
|
|
.rate = 52000000, /* this varies! */
|
|
.hw_ctrld = false,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
|
|
.res_mask = U300_SYSCON_RRR_INTCON_RESET_EN,
|
|
/* INTCON can be reset but not clock-gated */
|
|
};
|
|
|
|
static struct clk mspro_clk = {
|
|
.name = "MSPRO",
|
|
.parent = &ahb_subsys_clk,
|
|
.rate = 0, /* FIXME */
|
|
.hw_ctrld = false,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
|
|
.res_mask = U300_SYSCON_RRR_MSPRO_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_MSPRO_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
static struct clk emif_clk = {
|
|
.name = "EMIF",
|
|
.parent = &ahb_subsys_clk,
|
|
.rate = 104000000, /* this varies! */
|
|
.hw_ctrld = false,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
|
|
.res_mask = U300_SYSCON_RRR_EMIF_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_EMIF_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
.get_rate = clk_get_rate_emif_clk,
|
|
};
|
|
|
|
|
|
/*
|
|
* Clocks on the FAST bridge
|
|
*/
|
|
static struct clk fast_clk = {
|
|
.name = "FAST_BRIDGE",
|
|
.parent = &amba_clk,
|
|
.rate = 13000000, /* this varies! */
|
|
.hw_ctrld = true,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
|
|
.res_mask = U300_SYSCON_RFR_FAST_BRIDGE_RESET_ENABLE,
|
|
.clk_val = U300_SYSCON_SBCER_FAST_BRIDGE_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
static struct clk mmcsd_clk = {
|
|
.name = "MCLK",
|
|
.parent = &fast_clk,
|
|
.rate = 18900000, /* this varies! */
|
|
.hw_ctrld = false,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
|
|
.res_mask = U300_SYSCON_RFR_MMC_RESET_ENABLE,
|
|
.clk_val = U300_SYSCON_SBCER_MMC_CLK_EN,
|
|
.get_rate = clk_get_rate_mclk,
|
|
.set_rate = clk_set_rate_mclk,
|
|
.round_rate = clk_round_rate_mclk,
|
|
.disable = syscon_clk_disable,
|
|
.enable = syscon_clk_enable,
|
|
};
|
|
|
|
static struct clk i2s0_clk = {
|
|
.name = "i2s0",
|
|
.parent = &fast_clk,
|
|
.rate = 26000000, /* this varies! */
|
|
.hw_ctrld = true,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
|
|
.res_mask = U300_SYSCON_RFR_PCM_I2S0_RESET_ENABLE,
|
|
.clk_val = U300_SYSCON_SBCER_I2S0_CORE_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
.get_rate = clk_get_rate_i2s_i2c_spi,
|
|
};
|
|
|
|
static struct clk i2s1_clk = {
|
|
.name = "i2s1",
|
|
.parent = &fast_clk,
|
|
.rate = 26000000, /* this varies! */
|
|
.hw_ctrld = true,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
|
|
.res_mask = U300_SYSCON_RFR_PCM_I2S1_RESET_ENABLE,
|
|
.clk_val = U300_SYSCON_SBCER_I2S1_CORE_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
.get_rate = clk_get_rate_i2s_i2c_spi,
|
|
};
|
|
|
|
static struct clk i2c0_clk = {
|
|
.name = "I2C0",
|
|
.parent = &fast_clk,
|
|
.rate = 26000000, /* this varies! */
|
|
.hw_ctrld = false,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
|
|
.res_mask = U300_SYSCON_RFR_I2C0_RESET_ENABLE,
|
|
.clk_val = U300_SYSCON_SBCER_I2C0_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
.get_rate = clk_get_rate_i2s_i2c_spi,
|
|
};
|
|
|
|
static struct clk i2c1_clk = {
|
|
.name = "I2C1",
|
|
.parent = &fast_clk,
|
|
.rate = 26000000, /* this varies! */
|
|
.hw_ctrld = false,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
|
|
.res_mask = U300_SYSCON_RFR_I2C1_RESET_ENABLE,
|
|
.clk_val = U300_SYSCON_SBCER_I2C1_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
.get_rate = clk_get_rate_i2s_i2c_spi,
|
|
};
|
|
|
|
static struct clk spi_clk = {
|
|
.name = "SPI",
|
|
.parent = &fast_clk,
|
|
.rate = 26000000, /* this varies! */
|
|
.hw_ctrld = false,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
|
|
.res_mask = U300_SYSCON_RFR_SPI_RESET_ENABLE,
|
|
.clk_val = U300_SYSCON_SBCER_SPI_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
.get_rate = clk_get_rate_i2s_i2c_spi,
|
|
};
|
|
|
|
#ifdef CONFIG_MACH_U300_BS335
|
|
static struct clk uart1_clk = {
|
|
.name = "UART1",
|
|
.parent = &fast_clk,
|
|
.rate = 13000000,
|
|
.hw_ctrld = false,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
|
|
.res_mask = U300_SYSCON_RFR_UART1_RESET_ENABLE,
|
|
.clk_val = U300_SYSCON_SBCER_UART1_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Clocks on the SLOW bridge
|
|
*/
|
|
static struct clk slow_clk = {
|
|
.name = "SLOW_BRIDGE",
|
|
.parent = &amba_clk,
|
|
.rate = 13000000,
|
|
.hw_ctrld = true,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
|
|
.res_mask = U300_SYSCON_RSR_SLOW_BRIDGE_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_SLOW_BRIDGE_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
/* TODO: implement SYSCON clock? */
|
|
|
|
static struct clk wdog_clk = {
|
|
.name = "WDOG",
|
|
.parent = &slow_clk,
|
|
.hw_ctrld = false,
|
|
.rate = 32768,
|
|
.reset = false,
|
|
/* This is always on, cannot be enabled/disabled or reset */
|
|
};
|
|
|
|
/* This one is hardwired to PLL13 */
|
|
static struct clk uart_clk = {
|
|
.name = "UARTCLK",
|
|
.parent = &slow_clk,
|
|
.rate = 13000000,
|
|
.hw_ctrld = false,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
|
|
.res_mask = U300_SYSCON_RSR_UART_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_UART_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
static struct clk keypad_clk = {
|
|
.name = "KEYPAD",
|
|
.parent = &slow_clk,
|
|
.rate = 32768,
|
|
.hw_ctrld = false,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
|
|
.res_mask = U300_SYSCON_RSR_KEYPAD_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_KEYPAD_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
static struct clk gpio_clk = {
|
|
.name = "GPIO",
|
|
.parent = &slow_clk,
|
|
.rate = 13000000,
|
|
.hw_ctrld = true,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
|
|
.res_mask = U300_SYSCON_RSR_GPIO_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_GPIO_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
static struct clk rtc_clk = {
|
|
.name = "RTC",
|
|
.parent = &slow_clk,
|
|
.rate = 32768,
|
|
.hw_ctrld = true,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
|
|
.res_mask = U300_SYSCON_RSR_RTC_RESET_EN,
|
|
/* This clock is always on, cannot be enabled/disabled */
|
|
};
|
|
|
|
static struct clk bustr_clk = {
|
|
.name = "BUSTR",
|
|
.parent = &slow_clk,
|
|
.rate = 13000000,
|
|
.hw_ctrld = true,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
|
|
.res_mask = U300_SYSCON_RSR_BTR_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_BTR_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
static struct clk evhist_clk = {
|
|
.name = "EVHIST",
|
|
.parent = &slow_clk,
|
|
.rate = 13000000,
|
|
.hw_ctrld = true,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
|
|
.res_mask = U300_SYSCON_RSR_EH_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_EH_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
static struct clk timer_clk = {
|
|
.name = "TIMER",
|
|
.parent = &slow_clk,
|
|
.rate = 13000000,
|
|
.hw_ctrld = true,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
|
|
.res_mask = U300_SYSCON_RSR_ACC_TMR_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_ACC_TMR_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
static struct clk app_timer_clk = {
|
|
.name = "TIMER_APP",
|
|
.parent = &slow_clk,
|
|
.rate = 13000000,
|
|
.hw_ctrld = true,
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
|
|
.res_mask = U300_SYSCON_RSR_APP_TMR_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_APP_TMR_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
|
|
#ifdef CONFIG_MACH_U300_BS335
|
|
static struct clk ppm_clk = {
|
|
.name = "PPM",
|
|
.parent = &slow_clk,
|
|
.rate = 0, /* FIXME */
|
|
.hw_ctrld = true, /* TODO: Look up if it is hw ctrld or not */
|
|
.reset = true,
|
|
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
|
|
.res_mask = U300_SYSCON_RSR_PPM_RESET_EN,
|
|
.clk_val = U300_SYSCON_SBCER_PPM_CLK_EN,
|
|
.enable = syscon_clk_enable,
|
|
.disable = syscon_clk_disable,
|
|
};
|
|
#endif
|
|
|
|
#define DEF_LOOKUP(devid, clkref) \
|
|
{ \
|
|
.dev_id = devid, \
|
|
.clk = clkref, \
|
|
}
|
|
|
|
/*
|
|
* Here we only define clocks that are meaningful to
|
|
* look up through clockdevice.
|
|
*/
|
|
static struct clk_lookup lookups[] = {
|
|
/* Connected directly to the AMBA bus */
|
|
DEF_LOOKUP("amba", &amba_clk),
|
|
DEF_LOOKUP("cpu", &cpu_clk),
|
|
DEF_LOOKUP("nandif", &nandif_clk),
|
|
DEF_LOOKUP("semi", &semi_clk),
|
|
#ifdef CONFIG_MACH_U300_BS335
|
|
DEF_LOOKUP("isp", &isp_clk),
|
|
DEF_LOOKUP("cds", &cds_clk),
|
|
#endif
|
|
DEF_LOOKUP("dma", &dma_clk),
|
|
DEF_LOOKUP("aaif", &aaif_clk),
|
|
DEF_LOOKUP("apex", &apex_clk),
|
|
DEF_LOOKUP("video_enc", &video_enc_clk),
|
|
DEF_LOOKUP("xgam", &xgam_clk),
|
|
DEF_LOOKUP("ahb", &ahb_clk),
|
|
/* AHB bridge clocks */
|
|
DEF_LOOKUP("ahb", &ahb_subsys_clk),
|
|
DEF_LOOKUP("intcon", &intcon_clk),
|
|
DEF_LOOKUP("mspro", &mspro_clk),
|
|
DEF_LOOKUP("pl172", &emif_clk),
|
|
/* FAST bridge clocks */
|
|
DEF_LOOKUP("fast", &fast_clk),
|
|
DEF_LOOKUP("mmci", &mmcsd_clk),
|
|
/*
|
|
* The .0 and .1 identifiers on these comes from the platform device
|
|
* .id field and are assigned when the platform devices are registered.
|
|
*/
|
|
DEF_LOOKUP("i2s.0", &i2s0_clk),
|
|
DEF_LOOKUP("i2s.1", &i2s1_clk),
|
|
DEF_LOOKUP("stddci2c.0", &i2c0_clk),
|
|
DEF_LOOKUP("stddci2c.1", &i2c1_clk),
|
|
DEF_LOOKUP("pl022", &spi_clk),
|
|
#ifdef CONFIG_MACH_U300_BS335
|
|
DEF_LOOKUP("uart1", &uart1_clk),
|
|
#endif
|
|
/* SLOW bridge clocks */
|
|
DEF_LOOKUP("slow", &slow_clk),
|
|
DEF_LOOKUP("wdog", &wdog_clk),
|
|
DEF_LOOKUP("uart0", &uart_clk),
|
|
DEF_LOOKUP("apptimer", &app_timer_clk),
|
|
DEF_LOOKUP("keypad", &keypad_clk),
|
|
DEF_LOOKUP("u300-gpio", &gpio_clk),
|
|
DEF_LOOKUP("rtc0", &rtc_clk),
|
|
DEF_LOOKUP("bustr", &bustr_clk),
|
|
DEF_LOOKUP("evhist", &evhist_clk),
|
|
DEF_LOOKUP("timer", &timer_clk),
|
|
#ifdef CONFIG_MACH_U300_BS335
|
|
DEF_LOOKUP("ppm", &ppm_clk),
|
|
#endif
|
|
};
|
|
|
|
static void __init clk_register(void)
|
|
{
|
|
int i;
|
|
|
|
/* Register the lookups */
|
|
for (i = 0; i < ARRAY_SIZE(lookups); i++)
|
|
clkdev_add(&lookups[i]);
|
|
}
|
|
|
|
/*
|
|
* These are the clocks for cells registered as primecell drivers
|
|
* on the AMBA bus. These must be on during AMBA device registration
|
|
* since the bus probe will attempt to read magic configuration
|
|
* registers for these devices. If they are deactivated these probes
|
|
* will fail.
|
|
*
|
|
*
|
|
* Please note that on emif, both RAM and NAND is connected in dual
|
|
* RAM phones. On single RAM phones, ram is on semi and NAND on emif.
|
|
*
|
|
*/
|
|
void u300_clock_primecells(void)
|
|
{
|
|
clk_enable(&intcon_clk);
|
|
clk_enable(&uart_clk);
|
|
#ifdef CONFIG_MACH_U300_BS335
|
|
clk_enable(&uart1_clk);
|
|
#endif
|
|
clk_enable(&spi_clk);
|
|
|
|
clk_enable(&mmcsd_clk);
|
|
|
|
}
|
|
EXPORT_SYMBOL(u300_clock_primecells);
|
|
|
|
void u300_unclock_primecells(void)
|
|
{
|
|
|
|
clk_disable(&intcon_clk);
|
|
clk_disable(&uart_clk);
|
|
#ifdef CONFIG_MACH_U300_BS335
|
|
clk_disable(&uart1_clk);
|
|
#endif
|
|
clk_disable(&spi_clk);
|
|
clk_disable(&mmcsd_clk);
|
|
|
|
}
|
|
EXPORT_SYMBOL(u300_unclock_primecells);
|
|
|
|
/*
|
|
* The interrupt controller is enabled before the clock API is registered.
|
|
*/
|
|
void u300_enable_intcon_clock(void)
|
|
{
|
|
clk_enable(&intcon_clk);
|
|
}
|
|
EXPORT_SYMBOL(u300_enable_intcon_clock);
|
|
|
|
/*
|
|
* The timer is enabled before the clock API is registered.
|
|
*/
|
|
void u300_enable_timer_clock(void)
|
|
{
|
|
clk_enable(&app_timer_clk);
|
|
}
|
|
EXPORT_SYMBOL(u300_enable_timer_clock);
|
|
|
|
#if (defined(CONFIG_DEBUG_FS) && defined(CONFIG_U300_DEBUG))
|
|
/*
|
|
* The following makes it possible to view the status (especially
|
|
* reference count and reset status) for the clocks in the platform
|
|
* by looking into the special file <debugfs>/u300_clocks
|
|
*/
|
|
|
|
/* A list of all clocks in the platform */
|
|
static struct clk *clks[] = {
|
|
/* Top node clock for the AMBA bus */
|
|
&amba_clk,
|
|
/* Connected directly to the AMBA bus */
|
|
&cpu_clk,
|
|
&nandif_clk,
|
|
&semi_clk,
|
|
#ifdef CONFIG_MACH_U300_BS335
|
|
&isp_clk,
|
|
&cds_clk,
|
|
#endif
|
|
&dma_clk,
|
|
&aaif_clk,
|
|
&apex_clk,
|
|
&video_enc_clk,
|
|
&xgam_clk,
|
|
&ahb_clk,
|
|
|
|
/* AHB bridge clocks */
|
|
&ahb_subsys_clk,
|
|
&intcon_clk,
|
|
&mspro_clk,
|
|
&emif_clk,
|
|
/* FAST bridge clocks */
|
|
&fast_clk,
|
|
&mmcsd_clk,
|
|
&i2s0_clk,
|
|
&i2s1_clk,
|
|
&i2c0_clk,
|
|
&i2c1_clk,
|
|
&spi_clk,
|
|
#ifdef CONFIG_MACH_U300_BS335
|
|
&uart1_clk,
|
|
#endif
|
|
/* SLOW bridge clocks */
|
|
&slow_clk,
|
|
&wdog_clk,
|
|
&uart_clk,
|
|
&app_timer_clk,
|
|
&keypad_clk,
|
|
&gpio_clk,
|
|
&rtc_clk,
|
|
&bustr_clk,
|
|
&evhist_clk,
|
|
&timer_clk,
|
|
#ifdef CONFIG_MACH_U300_BS335
|
|
&ppm_clk,
|
|
#endif
|
|
};
|
|
|
|
static int u300_clocks_show(struct seq_file *s, void *data)
|
|
{
|
|
struct clk *clk;
|
|
int i;
|
|
|
|
seq_printf(s, "CLOCK DEVICE RESET STATE\t" \
|
|
"ACTIVE\tUSERS\tHW CTRL FREQ\n");
|
|
seq_printf(s, "---------------------------------------------" \
|
|
"-----------------------------------------\n");
|
|
for (i = 0; i < ARRAY_SIZE(clks); i++) {
|
|
clk = clks[i];
|
|
if (clk != ERR_PTR(-ENOENT)) {
|
|
/* Format clock and device name nicely */
|
|
char cdp[33];
|
|
int chars;
|
|
|
|
chars = snprintf(&cdp[0], 17, "%s", clk->name);
|
|
while (chars < 16) {
|
|
cdp[chars] = ' ';
|
|
chars++;
|
|
}
|
|
chars = snprintf(&cdp[16], 17, "%s", clk->dev ?
|
|
dev_name(clk->dev) : "N/A");
|
|
while (chars < 16) {
|
|
cdp[chars+16] = ' ';
|
|
chars++;
|
|
}
|
|
cdp[32] = '\0';
|
|
if (clk->get_rate)
|
|
seq_printf(s,
|
|
"%s%s\t%s\t%d\t%s\t%lu Hz\n",
|
|
&cdp[0],
|
|
clk->reset ?
|
|
"ASSERTED" : "RELEASED",
|
|
clk->usecount ? "ON" : "OFF",
|
|
clk->usecount,
|
|
clk->hw_ctrld ? "YES" : "NO ",
|
|
clk->get_rate(clk));
|
|
else
|
|
seq_printf(s,
|
|
"%s%s\t%s\t%d\t%s\t" \
|
|
"(unknown rate)\n",
|
|
&cdp[0],
|
|
clk->reset ?
|
|
"ASSERTED" : "RELEASED",
|
|
clk->usecount ? "ON" : "OFF",
|
|
clk->usecount,
|
|
clk->hw_ctrld ? "YES" : "NO ");
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int u300_clocks_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, u300_clocks_show, NULL);
|
|
}
|
|
|
|
static const struct file_operations u300_clocks_operations = {
|
|
.open = u300_clocks_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static void init_clk_read_procfs(void)
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{
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/* Expose a simple debugfs interface to view all clocks */
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(void) debugfs_create_file("u300_clocks", S_IFREG | S_IRUGO,
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NULL, NULL, &u300_clocks_operations);
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}
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#else
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static inline void init_clk_read_procfs(void)
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{
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}
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#endif
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static int __init u300_clock_init(void)
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{
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u16 val;
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/*
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* FIXME: shall all this powermanagement stuff really live here???
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*/
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/* Set system to run at PLL208, max performance, a known state. */
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
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val &= ~U300_SYSCON_CCR_CLKING_PERFORMANCE_MASK;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
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/* Wait for the PLL208 to lock if not locked in yet */
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while (!(readw(U300_SYSCON_VBASE + U300_SYSCON_CSR) &
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U300_SYSCON_CSR_PLL208_LOCK_IND));
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/* Power management enable */
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val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMCR);
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val |= U300_SYSCON_PMCR_PWR_MGNT_ENABLE;
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writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMCR);
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clk_register();
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init_clk_read_procfs();
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/*
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* Some of these may be on when we boot the system so make sure they
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* are turned OFF.
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*/
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syscon_block_reset_enable(&timer_clk);
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timer_clk.disable(&timer_clk);
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/*
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* These shall be turned on by default when we boot the system
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* so make sure they are ON. (Adding CPU here is a bit too much.)
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* These clocks will be claimed by drivers later.
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*/
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syscon_block_reset_disable(&semi_clk);
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syscon_block_reset_disable(&emif_clk);
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semi_clk.enable(&semi_clk);
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emif_clk.enable(&emif_clk);
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return 0;
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}
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/* initialize clocking early to be available later in the boot */
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core_initcall(u300_clock_init);
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