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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
*/
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <bcm63xx_cpu.h>
#include <bcm63xx_io.h>
#include <bcm63xx_regs.h>
#include <bcm63xx_clk.h>
static DEFINE_MUTEX(clocks_mutex);
static void clk_enable_unlocked(struct clk *clk)
{
if (clk->set && (clk->usage++) == 0)
clk->set(clk, 1);
}
static void clk_disable_unlocked(struct clk *clk)
{
if (clk->set && (--clk->usage) == 0)
clk->set(clk, 0);
}
static void bcm_hwclock_set(u32 mask, int enable)
{
u32 reg;
reg = bcm_perf_readl(PERF_CKCTL_REG);
if (enable)
reg |= mask;
else
reg &= ~mask;
bcm_perf_writel(reg, PERF_CKCTL_REG);
}
/*
* Ethernet MAC "misc" clock: dma clocks and main clock on 6348
*/
static void enet_misc_set(struct clk *clk, int enable)
{
u32 mask;
if (BCMCPU_IS_6338())
mask = CKCTL_6338_ENET_EN;
else if (BCMCPU_IS_6345())
mask = CKCTL_6345_ENET_EN;
else if (BCMCPU_IS_6348())
mask = CKCTL_6348_ENET_EN;
else
/* BCMCPU_IS_6358 */
mask = CKCTL_6358_EMUSB_EN;
bcm_hwclock_set(mask, enable);
}
static struct clk clk_enet_misc = {
.set = enet_misc_set,
};
/*
* Ethernet MAC clocks: only revelant on 6358, silently enable misc
* clocks
*/
static void enetx_set(struct clk *clk, int enable)
{
if (enable)
clk_enable_unlocked(&clk_enet_misc);
else
clk_disable_unlocked(&clk_enet_misc);
if (BCMCPU_IS_6358()) {
u32 mask;
if (clk->id == 0)
mask = CKCTL_6358_ENET0_EN;
else
mask = CKCTL_6358_ENET1_EN;
bcm_hwclock_set(mask, enable);
}
}
static struct clk clk_enet0 = {
.id = 0,
.set = enetx_set,
};
static struct clk clk_enet1 = {
.id = 1,
.set = enetx_set,
};
/*
* Ethernet PHY clock
*/
static void ephy_set(struct clk *clk, int enable)
{
if (!BCMCPU_IS_6358())
return;
bcm_hwclock_set(CKCTL_6358_EPHY_EN, enable);
}
static struct clk clk_ephy = {
.set = ephy_set,
};
/*
* Ethernet switch clock
*/
static void enetsw_set(struct clk *clk, int enable)
{
if (!BCMCPU_IS_6368())
return;
bcm_hwclock_set(CKCTL_6368_ROBOSW_CLK_EN |
CKCTL_6368_SWPKT_USB_EN |
CKCTL_6368_SWPKT_SAR_EN, enable);
if (enable) {
u32 val;
/* reset switch core afer clock change */
val = bcm_perf_readl(PERF_SOFTRESET_6368_REG);
val &= ~SOFTRESET_6368_ENETSW_MASK;
bcm_perf_writel(val, PERF_SOFTRESET_6368_REG);
msleep(10);
val |= SOFTRESET_6368_ENETSW_MASK;
bcm_perf_writel(val, PERF_SOFTRESET_6368_REG);
msleep(10);
}
}
static struct clk clk_enetsw = {
.set = enetsw_set,
};
/*
* PCM clock
*/
static void pcm_set(struct clk *clk, int enable)
{
if (!BCMCPU_IS_6358())
return;
bcm_hwclock_set(CKCTL_6358_PCM_EN, enable);
}
static struct clk clk_pcm = {
.set = pcm_set,
};
/*
* USB host clock
*/
static void usbh_set(struct clk *clk, int enable)
{
if (BCMCPU_IS_6348())
bcm_hwclock_set(CKCTL_6348_USBH_EN, enable);
else if (BCMCPU_IS_6368())
bcm_hwclock_set(CKCTL_6368_USBH_CLK_EN, enable);
}
static struct clk clk_usbh = {
.set = usbh_set,
};
/*
* SPI clock
*/
static void spi_set(struct clk *clk, int enable)
{
u32 mask;
if (BCMCPU_IS_6338())
mask = CKCTL_6338_SPI_EN;
else if (BCMCPU_IS_6348())
mask = CKCTL_6348_SPI_EN;
else
/* BCMCPU_IS_6358 */
mask = CKCTL_6358_SPI_EN;
bcm_hwclock_set(mask, enable);
}
static struct clk clk_spi = {
.set = spi_set,
};
/*
* XTM clock
*/
static void xtm_set(struct clk *clk, int enable)
{
if (!BCMCPU_IS_6368())
return;
bcm_hwclock_set(CKCTL_6368_SAR_CLK_EN |
CKCTL_6368_SWPKT_SAR_EN, enable);
if (enable) {
u32 val;
/* reset sar core afer clock change */
val = bcm_perf_readl(PERF_SOFTRESET_6368_REG);
val &= ~SOFTRESET_6368_SAR_MASK;
bcm_perf_writel(val, PERF_SOFTRESET_6368_REG);
mdelay(1);
val |= SOFTRESET_6368_SAR_MASK;
bcm_perf_writel(val, PERF_SOFTRESET_6368_REG);
mdelay(1);
}
}
static struct clk clk_xtm = {
.set = xtm_set,
};
/*
* Internal peripheral clock
*/
static struct clk clk_periph = {
.rate = (50 * 1000 * 1000),
};
/*
* Linux clock API implementation
*/
int clk_enable(struct clk *clk)
{
mutex_lock(&clocks_mutex);
clk_enable_unlocked(clk);
mutex_unlock(&clocks_mutex);
return 0;
}
EXPORT_SYMBOL(clk_enable);
void clk_disable(struct clk *clk)
{
mutex_lock(&clocks_mutex);
clk_disable_unlocked(clk);
mutex_unlock(&clocks_mutex);
}
EXPORT_SYMBOL(clk_disable);
unsigned long clk_get_rate(struct clk *clk)
{
return clk->rate;
}
EXPORT_SYMBOL(clk_get_rate);
struct clk *clk_get(struct device *dev, const char *id)
{
if (!strcmp(id, "enet0"))
return &clk_enet0;
if (!strcmp(id, "enet1"))
return &clk_enet1;
if (!strcmp(id, "enetsw"))
return &clk_enetsw;
if (!strcmp(id, "ephy"))
return &clk_ephy;
if (!strcmp(id, "usbh"))
return &clk_usbh;
if (!strcmp(id, "spi"))
return &clk_spi;
if (!strcmp(id, "xtm"))
return &clk_xtm;
if (!strcmp(id, "periph"))
return &clk_periph;
if (BCMCPU_IS_6358() && !strcmp(id, "pcm"))
return &clk_pcm;
return ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(clk_get);
void clk_put(struct clk *clk)
{
}
EXPORT_SYMBOL(clk_put);
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