410 lines
7.5 KiB
C
410 lines
7.5 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
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*/
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <bcm63xx_cpu.h>
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#include <bcm63xx_io.h>
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#include <bcm63xx_regs.h>
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#include <bcm63xx_reset.h>
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struct clk {
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void (*set)(struct clk *, int);
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unsigned int rate;
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unsigned int usage;
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int id;
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};
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static DEFINE_MUTEX(clocks_mutex);
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static void clk_enable_unlocked(struct clk *clk)
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{
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if (clk->set && (clk->usage++) == 0)
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clk->set(clk, 1);
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}
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static void clk_disable_unlocked(struct clk *clk)
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{
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if (clk->set && (--clk->usage) == 0)
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clk->set(clk, 0);
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}
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static void bcm_hwclock_set(u32 mask, int enable)
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{
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u32 reg;
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reg = bcm_perf_readl(PERF_CKCTL_REG);
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if (enable)
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reg |= mask;
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else
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reg &= ~mask;
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bcm_perf_writel(reg, PERF_CKCTL_REG);
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}
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/*
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* Ethernet MAC "misc" clock: dma clocks and main clock on 6348
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*/
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static void enet_misc_set(struct clk *clk, int enable)
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{
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u32 mask;
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if (BCMCPU_IS_6338())
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mask = CKCTL_6338_ENET_EN;
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else if (BCMCPU_IS_6345())
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mask = CKCTL_6345_ENET_EN;
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else if (BCMCPU_IS_6348())
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mask = CKCTL_6348_ENET_EN;
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else
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/* BCMCPU_IS_6358 */
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mask = CKCTL_6358_EMUSB_EN;
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bcm_hwclock_set(mask, enable);
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}
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static struct clk clk_enet_misc = {
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.set = enet_misc_set,
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};
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/*
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* Ethernet MAC clocks: only revelant on 6358, silently enable misc
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* clocks
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*/
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static void enetx_set(struct clk *clk, int enable)
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{
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if (enable)
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clk_enable_unlocked(&clk_enet_misc);
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else
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clk_disable_unlocked(&clk_enet_misc);
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if (BCMCPU_IS_3368() || BCMCPU_IS_6358()) {
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u32 mask;
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if (clk->id == 0)
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mask = CKCTL_6358_ENET0_EN;
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else
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mask = CKCTL_6358_ENET1_EN;
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bcm_hwclock_set(mask, enable);
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}
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}
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static struct clk clk_enet0 = {
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.id = 0,
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.set = enetx_set,
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};
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static struct clk clk_enet1 = {
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.id = 1,
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.set = enetx_set,
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};
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/*
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* Ethernet PHY clock
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*/
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static void ephy_set(struct clk *clk, int enable)
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{
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if (BCMCPU_IS_3368() || BCMCPU_IS_6358())
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bcm_hwclock_set(CKCTL_6358_EPHY_EN, enable);
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}
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static struct clk clk_ephy = {
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.set = ephy_set,
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};
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/*
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* Ethernet switch clock
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*/
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static void enetsw_set(struct clk *clk, int enable)
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{
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if (BCMCPU_IS_6328())
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bcm_hwclock_set(CKCTL_6328_ROBOSW_EN, enable);
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else if (BCMCPU_IS_6362())
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bcm_hwclock_set(CKCTL_6362_ROBOSW_EN, enable);
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else if (BCMCPU_IS_6368())
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bcm_hwclock_set(CKCTL_6368_ROBOSW_EN |
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CKCTL_6368_SWPKT_USB_EN |
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CKCTL_6368_SWPKT_SAR_EN,
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enable);
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else
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return;
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if (enable) {
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/* reset switch core afer clock change */
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bcm63xx_core_set_reset(BCM63XX_RESET_ENETSW, 1);
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msleep(10);
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bcm63xx_core_set_reset(BCM63XX_RESET_ENETSW, 0);
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msleep(10);
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}
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}
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static struct clk clk_enetsw = {
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.set = enetsw_set,
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};
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/*
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* PCM clock
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*/
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static void pcm_set(struct clk *clk, int enable)
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{
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if (BCMCPU_IS_3368())
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bcm_hwclock_set(CKCTL_3368_PCM_EN, enable);
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if (BCMCPU_IS_6358())
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bcm_hwclock_set(CKCTL_6358_PCM_EN, enable);
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}
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static struct clk clk_pcm = {
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.set = pcm_set,
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};
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/*
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* USB host clock
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*/
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static void usbh_set(struct clk *clk, int enable)
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{
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if (BCMCPU_IS_6328())
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bcm_hwclock_set(CKCTL_6328_USBH_EN, enable);
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else if (BCMCPU_IS_6348())
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bcm_hwclock_set(CKCTL_6348_USBH_EN, enable);
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else if (BCMCPU_IS_6362())
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bcm_hwclock_set(CKCTL_6362_USBH_EN, enable);
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else if (BCMCPU_IS_6368())
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bcm_hwclock_set(CKCTL_6368_USBH_EN, enable);
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}
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static struct clk clk_usbh = {
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.set = usbh_set,
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};
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/*
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* USB device clock
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*/
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static void usbd_set(struct clk *clk, int enable)
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{
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if (BCMCPU_IS_6328())
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bcm_hwclock_set(CKCTL_6328_USBD_EN, enable);
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else if (BCMCPU_IS_6362())
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bcm_hwclock_set(CKCTL_6362_USBD_EN, enable);
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else if (BCMCPU_IS_6368())
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bcm_hwclock_set(CKCTL_6368_USBD_EN, enable);
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}
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static struct clk clk_usbd = {
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.set = usbd_set,
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};
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/*
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* SPI clock
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*/
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static void spi_set(struct clk *clk, int enable)
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{
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u32 mask;
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if (BCMCPU_IS_6338())
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mask = CKCTL_6338_SPI_EN;
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else if (BCMCPU_IS_6348())
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mask = CKCTL_6348_SPI_EN;
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else if (BCMCPU_IS_3368() || BCMCPU_IS_6358())
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mask = CKCTL_6358_SPI_EN;
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else if (BCMCPU_IS_6362())
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mask = CKCTL_6362_SPI_EN;
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else
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/* BCMCPU_IS_6368 */
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mask = CKCTL_6368_SPI_EN;
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bcm_hwclock_set(mask, enable);
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}
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static struct clk clk_spi = {
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.set = spi_set,
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};
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/*
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* HSSPI clock
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*/
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static void hsspi_set(struct clk *clk, int enable)
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{
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u32 mask;
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if (BCMCPU_IS_6328())
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mask = CKCTL_6328_HSSPI_EN;
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else if (BCMCPU_IS_6362())
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mask = CKCTL_6362_HSSPI_EN;
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else
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return;
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bcm_hwclock_set(mask, enable);
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}
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static struct clk clk_hsspi = {
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.set = hsspi_set,
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};
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/*
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* XTM clock
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*/
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static void xtm_set(struct clk *clk, int enable)
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{
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if (!BCMCPU_IS_6368())
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return;
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bcm_hwclock_set(CKCTL_6368_SAR_EN |
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CKCTL_6368_SWPKT_SAR_EN, enable);
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if (enable) {
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/* reset sar core afer clock change */
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bcm63xx_core_set_reset(BCM63XX_RESET_SAR, 1);
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mdelay(1);
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bcm63xx_core_set_reset(BCM63XX_RESET_SAR, 0);
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mdelay(1);
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}
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}
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static struct clk clk_xtm = {
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.set = xtm_set,
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};
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/*
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* IPsec clock
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*/
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static void ipsec_set(struct clk *clk, int enable)
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{
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if (BCMCPU_IS_6362())
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bcm_hwclock_set(CKCTL_6362_IPSEC_EN, enable);
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else if (BCMCPU_IS_6368())
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bcm_hwclock_set(CKCTL_6368_IPSEC_EN, enable);
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}
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static struct clk clk_ipsec = {
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.set = ipsec_set,
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};
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/*
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* PCIe clock
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*/
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static void pcie_set(struct clk *clk, int enable)
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{
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if (BCMCPU_IS_6328())
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bcm_hwclock_set(CKCTL_6328_PCIE_EN, enable);
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else if (BCMCPU_IS_6362())
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bcm_hwclock_set(CKCTL_6362_PCIE_EN, enable);
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}
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static struct clk clk_pcie = {
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.set = pcie_set,
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};
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/*
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* Internal peripheral clock
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*/
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static struct clk clk_periph = {
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.rate = (50 * 1000 * 1000),
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};
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/*
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* Linux clock API implementation
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*/
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int clk_enable(struct clk *clk)
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{
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mutex_lock(&clocks_mutex);
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clk_enable_unlocked(clk);
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mutex_unlock(&clocks_mutex);
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return 0;
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}
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EXPORT_SYMBOL(clk_enable);
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void clk_disable(struct clk *clk)
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{
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mutex_lock(&clocks_mutex);
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clk_disable_unlocked(clk);
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mutex_unlock(&clocks_mutex);
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}
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EXPORT_SYMBOL(clk_disable);
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unsigned long clk_get_rate(struct clk *clk)
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{
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return clk->rate;
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}
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EXPORT_SYMBOL(clk_get_rate);
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int clk_set_rate(struct clk *clk, unsigned long rate)
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{
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return 0;
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}
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EXPORT_SYMBOL_GPL(clk_set_rate);
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long clk_round_rate(struct clk *clk, unsigned long rate)
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{
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return 0;
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}
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EXPORT_SYMBOL_GPL(clk_round_rate);
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struct clk *clk_get(struct device *dev, const char *id)
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{
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if (!strcmp(id, "enet0"))
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return &clk_enet0;
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if (!strcmp(id, "enet1"))
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return &clk_enet1;
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if (!strcmp(id, "enetsw"))
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return &clk_enetsw;
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if (!strcmp(id, "ephy"))
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return &clk_ephy;
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if (!strcmp(id, "usbh"))
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return &clk_usbh;
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if (!strcmp(id, "usbd"))
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return &clk_usbd;
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if (!strcmp(id, "spi"))
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return &clk_spi;
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if (!strcmp(id, "hsspi"))
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return &clk_hsspi;
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if (!strcmp(id, "xtm"))
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return &clk_xtm;
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if (!strcmp(id, "periph"))
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return &clk_periph;
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if ((BCMCPU_IS_3368() || BCMCPU_IS_6358()) && !strcmp(id, "pcm"))
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return &clk_pcm;
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if ((BCMCPU_IS_6362() || BCMCPU_IS_6368()) && !strcmp(id, "ipsec"))
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return &clk_ipsec;
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if ((BCMCPU_IS_6328() || BCMCPU_IS_6362()) && !strcmp(id, "pcie"))
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return &clk_pcie;
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return ERR_PTR(-ENOENT);
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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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#define HSSPI_PLL_HZ_6328 133333333
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#define HSSPI_PLL_HZ_6362 400000000
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static int __init bcm63xx_clk_init(void)
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{
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switch (bcm63xx_get_cpu_id()) {
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case BCM6328_CPU_ID:
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clk_hsspi.rate = HSSPI_PLL_HZ_6328;
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break;
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case BCM6362_CPU_ID:
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clk_hsspi.rate = HSSPI_PLL_HZ_6362;
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break;
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}
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return 0;
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}
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arch_initcall(bcm63xx_clk_init);
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