2006-11-27 21:16:27 +00:00
|
|
|
/*
|
|
|
|
*
|
|
|
|
* Utility functions for the Freescale MPC52xx.
|
|
|
|
*
|
|
|
|
* Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com>
|
|
|
|
*
|
|
|
|
* This file is licensed under the terms of the GNU General Public License
|
|
|
|
* version 2. This program is licensed "as is" without any warranty of any
|
|
|
|
* kind, whether express or implied.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
#undef DEBUG
|
|
|
|
|
2010-08-07 02:49:18 +00:00
|
|
|
#include <linux/gpio.h>
|
2006-11-27 21:16:27 +00:00
|
|
|
#include <linux/kernel.h>
|
2008-01-25 05:25:31 +00:00
|
|
|
#include <linux/spinlock.h>
|
2007-10-10 15:52:00 +00:00
|
|
|
#include <linux/of_platform.h>
|
2010-08-07 02:49:18 +00:00
|
|
|
#include <linux/of_gpio.h>
|
2011-05-27 14:46:24 +00:00
|
|
|
#include <linux/export.h>
|
2006-11-27 21:16:27 +00:00
|
|
|
#include <asm/io.h>
|
|
|
|
#include <asm/prom.h>
|
|
|
|
#include <asm/mpc52xx.h>
|
|
|
|
|
2008-01-25 05:25:31 +00:00
|
|
|
/* MPC5200 device tree match tables */
|
2014-09-10 19:56:38 +00:00
|
|
|
static const struct of_device_id mpc52xx_xlb_ids[] __initconst = {
|
2008-01-25 05:25:31 +00:00
|
|
|
{ .compatible = "fsl,mpc5200-xlb", },
|
|
|
|
{ .compatible = "mpc5200-xlb", },
|
|
|
|
{}
|
|
|
|
};
|
2014-09-10 19:56:38 +00:00
|
|
|
static const struct of_device_id mpc52xx_bus_ids[] __initconst = {
|
2008-01-25 05:25:31 +00:00
|
|
|
{ .compatible = "fsl,mpc5200-immr", },
|
|
|
|
{ .compatible = "fsl,mpc5200b-immr", },
|
2009-02-27 06:19:36 +00:00
|
|
|
{ .compatible = "simple-bus", },
|
2008-01-25 05:25:31 +00:00
|
|
|
|
|
|
|
/* depreciated matches; shouldn't be used in new device trees */
|
2009-02-27 06:19:36 +00:00
|
|
|
{ .compatible = "fsl,lpb", },
|
2008-01-25 05:25:31 +00:00
|
|
|
{ .type = "builtin", .compatible = "mpc5200", }, /* efika */
|
|
|
|
{ .type = "soc", .compatible = "mpc5200", }, /* lite5200 */
|
|
|
|
{}
|
|
|
|
};
|
|
|
|
|
2007-10-18 18:44:33 +00:00
|
|
|
/*
|
|
|
|
* This variable is mapped in mpc52xx_map_wdt() and used in mpc52xx_restart().
|
|
|
|
* Permanent mapping is required because mpc52xx_restart() can be called
|
|
|
|
* from interrupt context while node mapping (which calls ioremap())
|
|
|
|
* cannot be used at such point.
|
|
|
|
*/
|
2008-12-25 04:33:34 +00:00
|
|
|
static DEFINE_SPINLOCK(mpc52xx_lock);
|
2008-01-25 05:25:31 +00:00
|
|
|
static struct mpc52xx_gpt __iomem *mpc52xx_wdt;
|
|
|
|
static struct mpc52xx_cdm __iomem *mpc52xx_cdm;
|
2006-11-27 21:16:27 +00:00
|
|
|
|
2007-10-09 20:45:28 +00:00
|
|
|
/*
|
|
|
|
* Configure the XLB arbiter settings to match what Linux expects.
|
|
|
|
*/
|
2006-11-27 21:16:27 +00:00
|
|
|
void __init
|
2007-10-09 20:45:28 +00:00
|
|
|
mpc5200_setup_xlb_arbiter(void)
|
2006-11-27 21:16:27 +00:00
|
|
|
{
|
2008-01-18 16:30:37 +00:00
|
|
|
struct device_node *np;
|
2006-11-27 21:16:27 +00:00
|
|
|
struct mpc52xx_xlb __iomem *xlb;
|
|
|
|
|
2008-01-25 05:25:31 +00:00
|
|
|
np = of_find_matching_node(NULL, mpc52xx_xlb_ids);
|
2008-01-18 16:30:37 +00:00
|
|
|
xlb = of_iomap(np, 0);
|
|
|
|
of_node_put(np);
|
2007-10-09 20:45:28 +00:00
|
|
|
if (!xlb) {
|
2006-11-27 21:16:27 +00:00
|
|
|
printk(KERN_ERR __FILE__ ": "
|
2008-10-08 17:36:21 +00:00
|
|
|
"Error mapping XLB in mpc52xx_setup_cpu(). "
|
2006-11-27 21:16:27 +00:00
|
|
|
"Expect some abnormal behavior\n");
|
2007-10-09 20:45:28 +00:00
|
|
|
return;
|
2006-11-27 21:16:27 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Configure the XLB Arbiter priorities */
|
|
|
|
out_be32(&xlb->master_pri_enable, 0xff);
|
|
|
|
out_be32(&xlb->master_priority, 0x11111111);
|
|
|
|
|
2008-10-15 17:09:59 +00:00
|
|
|
/*
|
|
|
|
* Disable XLB pipelining
|
2007-10-09 20:45:28 +00:00
|
|
|
* (cfr errate 292. We could do this only just before ATA PIO
|
|
|
|
* transaction and re-enable it afterwards ...)
|
2008-10-15 17:09:59 +00:00
|
|
|
* Not needed on MPC5200B.
|
2007-10-09 20:45:28 +00:00
|
|
|
*/
|
2008-10-15 17:09:59 +00:00
|
|
|
if ((mfspr(SPRN_SVR) & MPC5200_SVR_MASK) == MPC5200_SVR)
|
|
|
|
out_be32(&xlb->config, in_be32(&xlb->config) | MPC52xx_XLB_CFG_PLDIS);
|
2006-11-27 21:16:27 +00:00
|
|
|
|
2007-10-09 20:45:28 +00:00
|
|
|
iounmap(xlb);
|
2006-11-27 21:16:27 +00:00
|
|
|
}
|
|
|
|
|
2010-08-07 02:49:18 +00:00
|
|
|
/*
|
|
|
|
* This variable is mapped in mpc52xx_map_common_devices and
|
|
|
|
* used in mpc5200_psc_ac97_gpio_reset().
|
|
|
|
*/
|
|
|
|
static DEFINE_SPINLOCK(gpio_lock);
|
|
|
|
struct mpc52xx_gpio __iomem *simple_gpio;
|
|
|
|
struct mpc52xx_gpio_wkup __iomem *wkup_gpio;
|
|
|
|
|
2008-01-25 05:25:31 +00:00
|
|
|
/**
|
|
|
|
* mpc52xx_declare_of_platform_devices: register internal devices and children
|
|
|
|
* of the localplus bus to the of_platform
|
|
|
|
* bus.
|
|
|
|
*/
|
2011-06-21 08:45:13 +00:00
|
|
|
void __init mpc52xx_declare_of_platform_devices(void)
|
2006-11-27 21:16:27 +00:00
|
|
|
{
|
2011-06-21 08:45:13 +00:00
|
|
|
/* Find all the 'platform' devices and register them. */
|
|
|
|
if (of_platform_populate(NULL, mpc52xx_bus_ids, NULL, NULL))
|
|
|
|
pr_err(__FILE__ ": Error while populating devices from DT\n");
|
2006-11-27 21:16:27 +00:00
|
|
|
}
|
|
|
|
|
2008-01-25 05:25:31 +00:00
|
|
|
/*
|
2008-01-25 05:25:31 +00:00
|
|
|
* match tables used by mpc52xx_map_common_devices()
|
2008-01-25 05:25:31 +00:00
|
|
|
*/
|
2014-09-10 19:56:38 +00:00
|
|
|
static const struct of_device_id mpc52xx_gpt_ids[] __initconst = {
|
2008-01-25 05:25:31 +00:00
|
|
|
{ .compatible = "fsl,mpc5200-gpt", },
|
|
|
|
{ .compatible = "mpc5200-gpt", }, /* old */
|
|
|
|
{}
|
|
|
|
};
|
2014-09-10 19:56:38 +00:00
|
|
|
static const struct of_device_id mpc52xx_cdm_ids[] __initconst = {
|
2008-01-25 05:25:31 +00:00
|
|
|
{ .compatible = "fsl,mpc5200-cdm", },
|
|
|
|
{ .compatible = "mpc5200-cdm", }, /* old */
|
|
|
|
{}
|
|
|
|
};
|
2014-09-10 19:56:38 +00:00
|
|
|
static const struct of_device_id mpc52xx_gpio_simple[] __initconst = {
|
2010-08-07 02:49:18 +00:00
|
|
|
{ .compatible = "fsl,mpc5200-gpio", },
|
|
|
|
{}
|
|
|
|
};
|
2014-09-10 19:56:38 +00:00
|
|
|
static const struct of_device_id mpc52xx_gpio_wkup[] __initconst = {
|
2010-08-07 02:49:18 +00:00
|
|
|
{ .compatible = "fsl,mpc5200-gpio-wkup", },
|
|
|
|
{}
|
|
|
|
};
|
|
|
|
|
2008-01-25 05:25:31 +00:00
|
|
|
|
2008-01-25 05:25:31 +00:00
|
|
|
/**
|
|
|
|
* mpc52xx_map_common_devices: iomap devices required by common code
|
|
|
|
*/
|
2007-10-18 18:44:33 +00:00
|
|
|
void __init
|
2008-01-25 05:25:31 +00:00
|
|
|
mpc52xx_map_common_devices(void)
|
2007-10-18 18:44:33 +00:00
|
|
|
{
|
|
|
|
struct device_node *np;
|
2008-01-25 05:25:31 +00:00
|
|
|
|
2007-10-18 18:44:33 +00:00
|
|
|
/* mpc52xx_wdt is mapped here and used in mpc52xx_restart,
|
|
|
|
* possibly from a interrupt context. wdt is only implement
|
|
|
|
* on a gpt0, so check has-wdt property before mapping.
|
|
|
|
*/
|
2008-01-25 05:25:31 +00:00
|
|
|
for_each_matching_node(np, mpc52xx_gpt_ids) {
|
|
|
|
if (of_get_property(np, "fsl,has-wdt", NULL) ||
|
|
|
|
of_get_property(np, "has-wdt", NULL)) {
|
2008-01-18 16:30:37 +00:00
|
|
|
mpc52xx_wdt = of_iomap(np, 0);
|
|
|
|
of_node_put(np);
|
2008-01-25 05:25:31 +00:00
|
|
|
break;
|
2007-10-18 18:44:33 +00:00
|
|
|
}
|
|
|
|
}
|
2008-01-25 05:25:31 +00:00
|
|
|
|
|
|
|
/* Clock Distribution Module, used by PSC clock setting function */
|
|
|
|
np = of_find_matching_node(NULL, mpc52xx_cdm_ids);
|
|
|
|
mpc52xx_cdm = of_iomap(np, 0);
|
|
|
|
of_node_put(np);
|
2010-08-07 02:49:18 +00:00
|
|
|
|
|
|
|
/* simple_gpio registers */
|
|
|
|
np = of_find_matching_node(NULL, mpc52xx_gpio_simple);
|
|
|
|
simple_gpio = of_iomap(np, 0);
|
|
|
|
of_node_put(np);
|
|
|
|
|
|
|
|
/* wkup_gpio registers */
|
|
|
|
np = of_find_matching_node(NULL, mpc52xx_gpio_wkup);
|
|
|
|
wkup_gpio = of_iomap(np, 0);
|
|
|
|
of_node_put(np);
|
2007-10-18 18:44:33 +00:00
|
|
|
}
|
|
|
|
|
2008-01-25 05:25:31 +00:00
|
|
|
/**
|
|
|
|
* mpc52xx_set_psc_clkdiv: Set clock divider in the CDM for PSC ports
|
|
|
|
*
|
|
|
|
* @psc_id: id of psc port; must be 1,2,3 or 6
|
|
|
|
* @clkdiv: clock divider value to put into CDM PSC register.
|
|
|
|
*/
|
|
|
|
int mpc52xx_set_psc_clkdiv(int psc_id, int clkdiv)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
u16 __iomem *reg;
|
|
|
|
u32 val;
|
|
|
|
u32 mask;
|
|
|
|
u32 mclken_div;
|
|
|
|
|
|
|
|
if (!mpc52xx_cdm)
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
mclken_div = 0x8000 | (clkdiv & 0x1FF);
|
|
|
|
switch (psc_id) {
|
|
|
|
case 1: reg = &mpc52xx_cdm->mclken_div_psc1; mask = 0x20; break;
|
|
|
|
case 2: reg = &mpc52xx_cdm->mclken_div_psc2; mask = 0x40; break;
|
|
|
|
case 3: reg = &mpc52xx_cdm->mclken_div_psc3; mask = 0x80; break;
|
|
|
|
case 6: reg = &mpc52xx_cdm->mclken_div_psc6; mask = 0x10; break;
|
|
|
|
default:
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Set the rate and enable the clock */
|
|
|
|
spin_lock_irqsave(&mpc52xx_lock, flags);
|
|
|
|
out_be16(reg, mclken_div);
|
|
|
|
val = in_be32(&mpc52xx_cdm->clk_enables);
|
|
|
|
out_be32(&mpc52xx_cdm->clk_enables, val | mask);
|
|
|
|
spin_unlock_irqrestore(&mpc52xx_lock, flags);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2008-02-24 05:51:28 +00:00
|
|
|
EXPORT_SYMBOL(mpc52xx_set_psc_clkdiv);
|
2008-01-25 05:25:31 +00:00
|
|
|
|
2009-03-11 15:36:26 +00:00
|
|
|
/**
|
|
|
|
* mpc52xx_get_xtal_freq - Get SYS_XTAL_IN frequency for a device
|
|
|
|
*
|
|
|
|
* @node: device node
|
|
|
|
*
|
|
|
|
* Returns the frequency of the external oscillator clock connected
|
|
|
|
* to the SYS_XTAL_IN pin, or 0 if it cannot be determined.
|
|
|
|
*/
|
|
|
|
unsigned int mpc52xx_get_xtal_freq(struct device_node *node)
|
|
|
|
{
|
|
|
|
u32 val;
|
|
|
|
unsigned int freq;
|
|
|
|
|
|
|
|
if (!mpc52xx_cdm)
|
|
|
|
return 0;
|
|
|
|
|
2009-06-17 06:30:22 +00:00
|
|
|
freq = mpc5xxx_get_bus_frequency(node);
|
2009-03-11 15:36:26 +00:00
|
|
|
if (!freq)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (in_8(&mpc52xx_cdm->ipb_clk_sel) & 0x1)
|
|
|
|
freq *= 2;
|
|
|
|
|
|
|
|
val = in_be32(&mpc52xx_cdm->rstcfg);
|
|
|
|
if (val & (1 << 5))
|
|
|
|
freq *= 8;
|
|
|
|
else
|
|
|
|
freq *= 4;
|
|
|
|
if (val & (1 << 6))
|
|
|
|
freq /= 12;
|
|
|
|
else
|
|
|
|
freq /= 16;
|
|
|
|
|
|
|
|
return freq;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(mpc52xx_get_xtal_freq);
|
|
|
|
|
2008-01-25 05:25:31 +00:00
|
|
|
/**
|
|
|
|
* mpc52xx_restart: ppc_md->restart hook for mpc5200 using the watchdog timer
|
|
|
|
*/
|
2016-07-12 00:54:52 +00:00
|
|
|
void __noreturn mpc52xx_restart(char *cmd)
|
2007-10-18 18:44:33 +00:00
|
|
|
{
|
|
|
|
local_irq_disable();
|
|
|
|
|
|
|
|
/* Turn on the watchdog and wait for it to expire.
|
|
|
|
* It effectively does a reset. */
|
|
|
|
if (mpc52xx_wdt) {
|
|
|
|
out_be32(&mpc52xx_wdt->mode, 0x00000000);
|
|
|
|
out_be32(&mpc52xx_wdt->count, 0x000000ff);
|
|
|
|
out_be32(&mpc52xx_wdt->mode, 0x00009004);
|
|
|
|
} else
|
2008-10-08 17:36:21 +00:00
|
|
|
printk(KERN_ERR __FILE__ ": "
|
|
|
|
"mpc52xx_restart: Can't access wdt. "
|
2007-10-18 18:44:33 +00:00
|
|
|
"Restart impossible, system halted.\n");
|
|
|
|
|
|
|
|
while (1);
|
|
|
|
}
|
2010-08-07 02:49:18 +00:00
|
|
|
|
|
|
|
#define PSC1_RESET 0x1
|
|
|
|
#define PSC1_SYNC 0x4
|
|
|
|
#define PSC1_SDATA_OUT 0x1
|
|
|
|
#define PSC2_RESET 0x2
|
|
|
|
#define PSC2_SYNC (0x4<<4)
|
|
|
|
#define PSC2_SDATA_OUT (0x1<<4)
|
|
|
|
#define MPC52xx_GPIO_PSC1_MASK 0x7
|
|
|
|
#define MPC52xx_GPIO_PSC2_MASK (0x7<<4)
|
|
|
|
|
|
|
|
/**
|
|
|
|
* mpc5200_psc_ac97_gpio_reset: Use gpio pins to reset the ac97 bus
|
|
|
|
*
|
|
|
|
* @psc: psc number to reset (only psc 1 and 2 support ac97)
|
|
|
|
*/
|
|
|
|
int mpc5200_psc_ac97_gpio_reset(int psc_number)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
u32 gpio;
|
|
|
|
u32 mux;
|
|
|
|
int out;
|
|
|
|
int reset;
|
|
|
|
int sync;
|
|
|
|
|
|
|
|
if ((!simple_gpio) || (!wkup_gpio))
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
switch (psc_number) {
|
|
|
|
case 0:
|
|
|
|
reset = PSC1_RESET; /* AC97_1_RES */
|
|
|
|
sync = PSC1_SYNC; /* AC97_1_SYNC */
|
|
|
|
out = PSC1_SDATA_OUT; /* AC97_1_SDATA_OUT */
|
|
|
|
gpio = MPC52xx_GPIO_PSC1_MASK;
|
|
|
|
break;
|
|
|
|
case 1:
|
|
|
|
reset = PSC2_RESET; /* AC97_2_RES */
|
|
|
|
sync = PSC2_SYNC; /* AC97_2_SYNC */
|
|
|
|
out = PSC2_SDATA_OUT; /* AC97_2_SDATA_OUT */
|
|
|
|
gpio = MPC52xx_GPIO_PSC2_MASK;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
pr_err(__FILE__ ": Unable to determine PSC, no ac97 "
|
|
|
|
"cold-reset will be performed\n");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_lock_irqsave(&gpio_lock, flags);
|
|
|
|
|
|
|
|
/* Reconfiure pin-muxing to gpio */
|
|
|
|
mux = in_be32(&simple_gpio->port_config);
|
|
|
|
out_be32(&simple_gpio->port_config, mux & (~gpio));
|
|
|
|
|
|
|
|
/* enable gpio pins for output */
|
|
|
|
setbits8(&wkup_gpio->wkup_gpioe, reset);
|
|
|
|
setbits32(&simple_gpio->simple_gpioe, sync | out);
|
|
|
|
|
|
|
|
setbits8(&wkup_gpio->wkup_ddr, reset);
|
|
|
|
setbits32(&simple_gpio->simple_ddr, sync | out);
|
|
|
|
|
|
|
|
/* Assert cold reset */
|
|
|
|
clrbits32(&simple_gpio->simple_dvo, sync | out);
|
|
|
|
clrbits8(&wkup_gpio->wkup_dvo, reset);
|
|
|
|
|
2010-09-03 17:27:38 +00:00
|
|
|
/* wait for 1 us */
|
|
|
|
udelay(1);
|
2010-08-07 02:49:18 +00:00
|
|
|
|
|
|
|
/* Deassert reset */
|
|
|
|
setbits8(&wkup_gpio->wkup_dvo, reset);
|
|
|
|
|
2010-09-03 17:27:38 +00:00
|
|
|
/* wait at least 200ns */
|
|
|
|
/* 7 ~= (200ns * timebase) / ns2sec */
|
|
|
|
__delay(7);
|
|
|
|
|
2010-08-07 02:49:18 +00:00
|
|
|
/* Restore pin-muxing */
|
|
|
|
out_be32(&simple_gpio->port_config, mux);
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&gpio_lock, flags);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(mpc5200_psc_ac97_gpio_reset);
|