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/*
* Copyright 2011 Freescale Semiconductor, Inc.
* Copyright 2011 Linaro Ltd.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/cpuidle.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/phy.h>
#include <linux/regmap.h>
#include <linux/micrel_phy.h>
#include <linux/mfd/syscon.h>
#include <asm/cpuidle.h>
#include <asm/smp_twd.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/hardware/gic.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <asm/system_misc.h>
#include "common.h"
#include "cpuidle.h"
#include "hardware.h"
#define IMX6Q_ANALOG_DIGPROG 0x260
static int imx6q_revision(void)
{
struct device_node *np;
void __iomem *base;
static u32 rev;
if (!rev) {
np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop");
if (!np)
return IMX_CHIP_REVISION_UNKNOWN;
base = of_iomap(np, 0);
if (!base) {
of_node_put(np);
return IMX_CHIP_REVISION_UNKNOWN;
}
rev = readl_relaxed(base + IMX6Q_ANALOG_DIGPROG);
iounmap(base);
of_node_put(np);
}
switch (rev & 0xff) {
case 0:
return IMX_CHIP_REVISION_1_0;
case 1:
return IMX_CHIP_REVISION_1_1;
case 2:
return IMX_CHIP_REVISION_1_2;
default:
return IMX_CHIP_REVISION_UNKNOWN;
}
}
void imx6q_restart(char mode, const char *cmd)
{
struct device_node *np;
void __iomem *wdog_base;
np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
wdog_base = of_iomap(np, 0);
if (!wdog_base)
goto soft;
imx_src_prepare_restart();
/* enable wdog */
writew_relaxed(1 << 2, wdog_base);
/* write twice to ensure the request will not get ignored */
writew_relaxed(1 << 2, wdog_base);
/* wait for reset to assert ... */
mdelay(500);
pr_err("Watchdog reset failed to assert reset\n");
/* delay to allow the serial port to show the message */
mdelay(50);
soft:
/* we'll take a jump through zero as a poor second */
soft_restart(0);
}
/* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
static int ksz9021rn_phy_fixup(struct phy_device *phydev)
{
if (IS_BUILTIN(CONFIG_PHYLIB)) {
/* min rx data delay */
phy_write(phydev, 0x0b, 0x8105);
phy_write(phydev, 0x0c, 0x0000);
/* max rx/tx clock delay, min rx/tx control delay */
phy_write(phydev, 0x0b, 0x8104);
phy_write(phydev, 0x0c, 0xf0f0);
phy_write(phydev, 0x0b, 0x104);
}
return 0;
}
static void __init imx6q_sabrelite_cko1_setup(void)
{
struct clk *cko1_sel, *ahb, *cko1;
unsigned long rate;
cko1_sel = clk_get_sys(NULL, "cko1_sel");
ahb = clk_get_sys(NULL, "ahb");
cko1 = clk_get_sys(NULL, "cko1");
if (IS_ERR(cko1_sel) || IS_ERR(ahb) || IS_ERR(cko1)) {
pr_err("cko1 setup failed!\n");
goto put_clk;
}
clk_set_parent(cko1_sel, ahb);
rate = clk_round_rate(cko1, 16000000);
clk_set_rate(cko1, rate);
put_clk:
if (!IS_ERR(cko1_sel))
clk_put(cko1_sel);
if (!IS_ERR(ahb))
clk_put(ahb);
if (!IS_ERR(cko1))
clk_put(cko1);
}
static void __init imx6q_sabrelite_init(void)
{
if (IS_BUILTIN(CONFIG_PHYLIB))
phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
ksz9021rn_phy_fixup);
imx6q_sabrelite_cko1_setup();
}
static void __init imx6q_1588_init(void)
{
struct regmap *gpr;
gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
if (!IS_ERR(gpr))
regmap_update_bits(gpr, 0x4, 1 << 21, 1 << 21);
else
pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");
}
static void __init imx6q_usb_init(void)
{
struct regmap *anatop;
#define HW_ANADIG_USB1_CHRG_DETECT 0x000001b0
#define HW_ANADIG_USB2_CHRG_DETECT 0x00000210
#define BM_ANADIG_USB_CHRG_DETECT_EN_B 0x00100000
#define BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B 0x00080000
anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop");
if (!IS_ERR(anatop)) {
/*
* The external charger detector needs to be disabled,
* or the signal at DP will be poor
*/
regmap_write(anatop, HW_ANADIG_USB1_CHRG_DETECT,
BM_ANADIG_USB_CHRG_DETECT_EN_B
| BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
regmap_write(anatop, HW_ANADIG_USB2_CHRG_DETECT,
BM_ANADIG_USB_CHRG_DETECT_EN_B |
BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
} else {
pr_warn("failed to find fsl,imx6q-anatop regmap\n");
}
}
static void __init imx6q_init_machine(void)
{
if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
imx6q_sabrelite_init();
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
imx6q_pm_init();
imx6q_usb_init();
imx6q_1588_init();
}
static struct cpuidle_driver imx6q_cpuidle_driver = {
.name = "imx6q_cpuidle",
.owner = THIS_MODULE,
.en_core_tk_irqen = 1,
.states[0] = ARM_CPUIDLE_WFI_STATE,
.state_count = 1,
};
static void __init imx6q_init_late(void)
{
imx_cpuidle_init(&imx6q_cpuidle_driver);
}
static void __init imx6q_map_io(void)
{
imx_lluart_map_io();
imx_scu_map_io();
imx6q_clock_map_io();
}
static const struct of_device_id imx6q_irq_match[] __initconst = {
{ .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
{ /* sentinel */ }
};
static void __init imx6q_init_irq(void)
{
l2x0_of_init(0, ~0UL);
imx_src_init();
imx_gpc_init();
of_irq_init(imx6q_irq_match);
}
static void __init imx6q_timer_init(void)
{
mx6q_clocks_init();
twd_local_timer_of_register();
imx_print_silicon_rev("i.MX6Q", imx6q_revision());
}
static struct sys_timer imx6q_timer = {
.init = imx6q_timer_init,
};
static const char *imx6q_dt_compat[] __initdata = {
"fsl,imx6q",
NULL,
};
DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
.smp = smp_ops(imx_smp_ops),
.map_io = imx6q_map_io,
.init_irq = imx6q_init_irq,
.timer = &imx6q_timer,
.init_machine = imx6q_init_machine,
.init_late = imx6q_init_late,
.dt_compat = imx6q_dt_compat,
.restart = imx6q_restart,
MACHINE_END
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