2 * Copyright 2011-2013 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/clk-provider.h>
15 #include <linux/clkdev.h>
16 #include <linux/clocksource.h>
17 #include <linux/cpu.h>
18 #include <linux/delay.h>
19 #include <linux/export.h>
20 #include <linux/init.h>
22 #include <linux/irq.h>
23 #include <linux/irqchip.h>
25 #include <linux/of_address.h>
26 #include <linux/of_irq.h>
27 #include <linux/of_platform.h>
28 #include <linux/opp.h>
29 #include <linux/phy.h>
30 #include <linux/reboot.h>
31 #include <linux/regmap.h>
32 #include <linux/micrel_phy.h>
33 #include <linux/mfd/syscon.h>
34 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
35 #include <asm/mach/arch.h>
36 #include <asm/mach/map.h>
37 #include <asm/system_misc.h>
43 static u32 chip_revision
;
45 int imx6q_revision(void)
50 static void __init
imx6q_init_revision(void)
52 u32 rev
= imx_anatop_get_digprog();
56 chip_revision
= IMX_CHIP_REVISION_1_0
;
59 chip_revision
= IMX_CHIP_REVISION_1_1
;
62 chip_revision
= IMX_CHIP_REVISION_1_2
;
65 chip_revision
= IMX_CHIP_REVISION_UNKNOWN
;
68 mxc_set_cpu_type(rev
>> 16 & 0xff);
71 static void imx6q_restart(enum reboot_mode mode
, const char *cmd
)
73 struct device_node
*np
;
74 void __iomem
*wdog_base
;
76 np
= of_find_compatible_node(NULL
, NULL
, "fsl,imx6q-wdt");
77 wdog_base
= of_iomap(np
, 0);
81 imx_src_prepare_restart();
84 writew_relaxed(1 << 2, wdog_base
);
85 /* write twice to ensure the request will not get ignored */
86 writew_relaxed(1 << 2, wdog_base
);
88 /* wait for reset to assert ... */
91 pr_err("Watchdog reset failed to assert reset\n");
93 /* delay to allow the serial port to show the message */
97 /* we'll take a jump through zero as a poor second */
101 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
102 static int ksz9021rn_phy_fixup(struct phy_device
*phydev
)
104 if (IS_BUILTIN(CONFIG_PHYLIB
)) {
105 /* min rx data delay */
106 phy_write(phydev
, MICREL_KSZ9021_EXTREG_CTRL
,
107 0x8000 | MICREL_KSZ9021_RGMII_RX_DATA_PAD_SCEW
);
108 phy_write(phydev
, MICREL_KSZ9021_EXTREG_DATA_WRITE
, 0x0000);
110 /* max rx/tx clock delay, min rx/tx control delay */
111 phy_write(phydev
, MICREL_KSZ9021_EXTREG_CTRL
,
112 0x8000 | MICREL_KSZ9021_RGMII_CLK_CTRL_PAD_SCEW
);
113 phy_write(phydev
, MICREL_KSZ9021_EXTREG_DATA_WRITE
, 0xf0f0);
114 phy_write(phydev
, MICREL_KSZ9021_EXTREG_CTRL
,
115 MICREL_KSZ9021_RGMII_CLK_CTRL_PAD_SCEW
);
121 static void mmd_write_reg(struct phy_device
*dev
, int device
, int reg
, int val
)
123 phy_write(dev
, 0x0d, device
);
124 phy_write(dev
, 0x0e, reg
);
125 phy_write(dev
, 0x0d, (1 << 14) | device
);
126 phy_write(dev
, 0x0e, val
);
129 static int ksz9031rn_phy_fixup(struct phy_device
*dev
)
132 * min rx data delay, max rx/tx clock delay,
133 * min rx/tx control delay
135 mmd_write_reg(dev
, 2, 4, 0);
136 mmd_write_reg(dev
, 2, 5, 0);
137 mmd_write_reg(dev
, 2, 8, 0x003ff);
142 static int ar8031_phy_fixup(struct phy_device
*dev
)
146 /* To enable AR8031 output a 125MHz clk from CLK_25M */
147 phy_write(dev
, 0xd, 0x7);
148 phy_write(dev
, 0xe, 0x8016);
149 phy_write(dev
, 0xd, 0x4007);
151 val
= phy_read(dev
, 0xe);
154 phy_write(dev
, 0xe, val
);
156 /* introduce tx clock delay */
157 phy_write(dev
, 0x1d, 0x5);
158 val
= phy_read(dev
, 0x1e);
160 phy_write(dev
, 0x1e, val
);
165 #define PHY_ID_AR8031 0x004dd074
167 static void __init
imx6q_enet_phy_init(void)
169 if (IS_BUILTIN(CONFIG_PHYLIB
)) {
170 phy_register_fixup_for_uid(PHY_ID_KSZ9021
, MICREL_PHY_ID_MASK
,
171 ksz9021rn_phy_fixup
);
172 phy_register_fixup_for_uid(PHY_ID_KSZ9031
, MICREL_PHY_ID_MASK
,
173 ksz9031rn_phy_fixup
);
174 phy_register_fixup_for_uid(PHY_ID_AR8031
, 0xffffffff,
179 static void __init
imx6q_1588_init(void)
183 gpr
= syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
185 regmap_update_bits(gpr
, IOMUXC_GPR1
,
186 IMX6Q_GPR1_ENET_CLK_SEL_MASK
,
187 IMX6Q_GPR1_ENET_CLK_SEL_ANATOP
);
189 pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");
193 static void __init
imx6q_init_machine(void)
195 imx6q_enet_phy_init();
197 of_platform_populate(NULL
, of_default_bus_match_table
, NULL
, NULL
);
204 #define OCOTP_CFG3 0x440
205 #define OCOTP_CFG3_SPEED_SHIFT 16
206 #define OCOTP_CFG3_SPEED_1P2GHZ 0x3
208 static void __init
imx6q_opp_check_1p2ghz(struct device
*cpu_dev
)
210 struct device_node
*np
;
214 np
= of_find_compatible_node(NULL
, NULL
, "fsl,imx6q-ocotp");
216 pr_warn("failed to find ocotp node\n");
220 base
= of_iomap(np
, 0);
222 pr_warn("failed to map ocotp\n");
226 val
= readl_relaxed(base
+ OCOTP_CFG3
);
227 val
>>= OCOTP_CFG3_SPEED_SHIFT
;
228 if ((val
& 0x3) != OCOTP_CFG3_SPEED_1P2GHZ
)
229 if (opp_disable(cpu_dev
, 1200000000))
230 pr_warn("failed to disable 1.2 GHz OPP\n");
236 static void __init
imx6q_opp_init(struct device
*cpu_dev
)
238 struct device_node
*np
;
240 np
= of_find_node_by_path("/cpus/cpu@0");
242 pr_warn("failed to find cpu0 node\n");
246 cpu_dev
->of_node
= np
;
247 if (of_init_opp_table(cpu_dev
)) {
248 pr_warn("failed to init OPP table\n");
252 imx6q_opp_check_1p2ghz(cpu_dev
);
258 static struct platform_device imx6q_cpufreq_pdev
= {
259 .name
= "imx6q-cpufreq",
262 static void __init
imx6q_init_late(void)
265 * WAIT mode is broken on TO 1.0 and 1.1, so there is no point
266 * to run cpuidle on them.
268 if (imx6q_revision() > IMX_CHIP_REVISION_1_1
)
269 imx6q_cpuidle_init();
271 if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ
)) {
272 imx6q_opp_init(&imx6q_cpufreq_pdev
.dev
);
273 platform_device_register(&imx6q_cpufreq_pdev
);
277 static void __init
imx6q_map_io(void)
283 static void __init
imx6q_init_irq(void)
285 imx6q_init_revision();
292 static void __init
imx6q_timer_init(void)
295 clocksource_of_init();
296 imx_print_silicon_rev(cpu_is_imx6dl() ? "i.MX6DL" : "i.MX6Q",
300 static const char *imx6q_dt_compat
[] __initdata
= {
306 DT_MACHINE_START(IMX6Q
, "Freescale i.MX6 Quad/DualLite (Device Tree)")
307 .smp
= smp_ops(imx_smp_ops
),
308 .map_io
= imx6q_map_io
,
309 .init_irq
= imx6q_init_irq
,
310 .init_time
= imx6q_timer_init
,
311 .init_machine
= imx6q_init_machine
,
312 .init_late
= imx6q_init_late
,
313 .dt_compat
= imx6q_dt_compat
,
314 .restart
= imx6q_restart
,