2 * Copyright 2011 Freescale Semiconductor, Inc.
3 * Copyright 2011 Linaro Ltd.
5 * The code contained herein is licensed under the GNU General Public
6 * License. You may obtain a copy of the GNU General Public License
7 * Version 2 or later at the following locations:
9 * http://www.opensource.org/licenses/gpl-license.html
10 * http://www.gnu.org/copyleft/gpl.html
13 #include <linux/clk.h>
14 #include <linux/clkdev.h>
15 #include <linux/delay.h>
16 #include <linux/export.h>
17 #include <linux/init.h>
19 #include <linux/irq.h>
20 #include <linux/irqchip.h>
22 #include <linux/of_address.h>
23 #include <linux/of_irq.h>
24 #include <linux/of_platform.h>
25 #include <linux/phy.h>
26 #include <linux/regmap.h>
27 #include <linux/micrel_phy.h>
28 #include <linux/mfd/syscon.h>
29 #include <asm/smp_twd.h>
30 #include <asm/hardware/cache-l2x0.h>
31 #include <asm/mach/arch.h>
32 #include <asm/mach/map.h>
33 #include <asm/mach/time.h>
34 #include <asm/system_misc.h>
40 #define IMX6Q_ANALOG_DIGPROG 0x260
42 static int imx6q_revision(void)
44 struct device_node *np;
49 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop");
51 return IMX_CHIP_REVISION_UNKNOWN;
52 base = of_iomap(np, 0);
55 return IMX_CHIP_REVISION_UNKNOWN;
57 rev = readl_relaxed(base + IMX6Q_ANALOG_DIGPROG);
64 return IMX_CHIP_REVISION_1_0;
66 return IMX_CHIP_REVISION_1_1;
68 return IMX_CHIP_REVISION_1_2;
70 return IMX_CHIP_REVISION_UNKNOWN;
74 void imx6q_restart(char mode, const char *cmd)
76 struct device_node *np;
77 void __iomem *wdog_base;
79 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
80 wdog_base = of_iomap(np, 0);
84 imx_src_prepare_restart();
87 writew_relaxed(1 << 2, wdog_base);
88 /* write twice to ensure the request will not get ignored */
89 writew_relaxed(1 << 2, wdog_base);
91 /* wait for reset to assert ... */
94 pr_err("Watchdog reset failed to assert reset\n");
96 /* delay to allow the serial port to show the message */
100 /* we'll take a jump through zero as a poor second */
104 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
105 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
107 if (IS_BUILTIN(CONFIG_PHYLIB)) {
108 /* min rx data delay */
109 phy_write(phydev, 0x0b, 0x8105);
110 phy_write(phydev, 0x0c, 0x0000);
112 /* max rx/tx clock delay, min rx/tx control delay */
113 phy_write(phydev, 0x0b, 0x8104);
114 phy_write(phydev, 0x0c, 0xf0f0);
115 phy_write(phydev, 0x0b, 0x104);
121 static void __init imx6q_sabrelite_cko1_setup(void)
123 struct clk *cko1_sel, *ahb, *cko1;
126 cko1_sel = clk_get_sys(NULL, "cko1_sel");
127 ahb = clk_get_sys(NULL, "ahb");
128 cko1 = clk_get_sys(NULL, "cko1");
129 if (IS_ERR(cko1_sel) || IS_ERR(ahb) || IS_ERR(cko1)) {
130 pr_err("cko1 setup failed!\n");
133 clk_set_parent(cko1_sel, ahb);
134 rate = clk_round_rate(cko1, 16000000);
135 clk_set_rate(cko1, rate);
137 if (!IS_ERR(cko1_sel))
145 static void __init imx6q_sabrelite_init(void)
147 if (IS_BUILTIN(CONFIG_PHYLIB))
148 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
149 ksz9021rn_phy_fixup);
150 imx6q_sabrelite_cko1_setup();
153 static void __init imx6q_1588_init(void)
157 gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
159 regmap_update_bits(gpr, 0x4, 1 << 21, 1 << 21);
161 pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");
164 static void __init imx6q_usb_init(void)
166 struct regmap *anatop;
168 #define HW_ANADIG_USB1_CHRG_DETECT 0x000001b0
169 #define HW_ANADIG_USB2_CHRG_DETECT 0x00000210
171 #define BM_ANADIG_USB_CHRG_DETECT_EN_B 0x00100000
172 #define BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B 0x00080000
174 anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop");
175 if (!IS_ERR(anatop)) {
177 * The external charger detector needs to be disabled,
178 * or the signal at DP will be poor
180 regmap_write(anatop, HW_ANADIG_USB1_CHRG_DETECT,
181 BM_ANADIG_USB_CHRG_DETECT_EN_B
182 | BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
183 regmap_write(anatop, HW_ANADIG_USB2_CHRG_DETECT,
184 BM_ANADIG_USB_CHRG_DETECT_EN_B |
185 BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
187 pr_warn("failed to find fsl,imx6q-anatop regmap\n");
191 static void __init imx6q_init_machine(void)
193 if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
194 imx6q_sabrelite_init();
196 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
203 static void __init imx6q_init_late(void)
206 * WAIT mode is broken on TO 1.0 and 1.1, so there is no point
207 * to run cpuidle on them.
209 if (imx6q_revision() > IMX_CHIP_REVISION_1_1)
210 imx6q_cpuidle_init();
213 static void __init imx6q_map_io(void)
219 static void __init imx6q_init_irq(void)
221 l2x0_of_init(0, ~0UL);
227 static void __init imx6q_timer_init(void)
230 twd_local_timer_of_register();
231 imx_print_silicon_rev("i.MX6Q", imx6q_revision());
234 static const char *imx6q_dt_compat[] __initdata = {
239 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
240 .smp = smp_ops(imx_smp_ops),
241 .map_io = imx6q_map_io,
242 .init_irq = imx6q_init_irq,
243 .init_time = imx6q_timer_init,
244 .init_machine = imx6q_init_machine,
245 .init_late = imx6q_init_late,
246 .dt_compat = imx6q_dt_compat,
247 .restart = imx6q_restart,