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/cpu.h>
16 #include <linux/delay.h>
17 #include <linux/export.h>
18 #include <linux/init.h>
20 #include <linux/irq.h>
21 #include <linux/irqchip.h>
23 #include <linux/of_address.h>
24 #include <linux/of_irq.h>
25 #include <linux/of_platform.h>
26 #include <linux/opp.h>
27 #include <linux/phy.h>
28 #include <linux/regmap.h>
29 #include <linux/micrel_phy.h>
30 #include <linux/mfd/syscon.h>
31 #include <asm/smp_twd.h>
32 #include <asm/hardware/cache-l2x0.h>
33 #include <asm/mach/arch.h>
34 #include <asm/mach/map.h>
35 #include <asm/mach/time.h>
36 #include <asm/system_misc.h>
42 #define IMX6Q_ANALOG_DIGPROG 0x260
44 static int imx6q_revision(void)
46 struct device_node *np;
51 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop");
53 return IMX_CHIP_REVISION_UNKNOWN;
54 base = of_iomap(np, 0);
57 return IMX_CHIP_REVISION_UNKNOWN;
59 rev = readl_relaxed(base + IMX6Q_ANALOG_DIGPROG);
66 return IMX_CHIP_REVISION_1_0;
68 return IMX_CHIP_REVISION_1_1;
70 return IMX_CHIP_REVISION_1_2;
72 return IMX_CHIP_REVISION_UNKNOWN;
76 void imx6q_restart(char mode, const char *cmd)
78 struct device_node *np;
79 void __iomem *wdog_base;
81 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
82 wdog_base = of_iomap(np, 0);
86 imx_src_prepare_restart();
89 writew_relaxed(1 << 2, wdog_base);
90 /* write twice to ensure the request will not get ignored */
91 writew_relaxed(1 << 2, wdog_base);
93 /* wait for reset to assert ... */
96 pr_err("Watchdog reset failed to assert reset\n");
98 /* delay to allow the serial port to show the message */
102 /* we'll take a jump through zero as a poor second */
106 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
107 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
109 if (IS_BUILTIN(CONFIG_PHYLIB)) {
110 /* min rx data delay */
111 phy_write(phydev, 0x0b, 0x8105);
112 phy_write(phydev, 0x0c, 0x0000);
114 /* max rx/tx clock delay, min rx/tx control delay */
115 phy_write(phydev, 0x0b, 0x8104);
116 phy_write(phydev, 0x0c, 0xf0f0);
117 phy_write(phydev, 0x0b, 0x104);
123 static void __init imx6q_sabrelite_cko1_setup(void)
125 struct clk *cko1_sel, *ahb, *cko1;
128 cko1_sel = clk_get_sys(NULL, "cko1_sel");
129 ahb = clk_get_sys(NULL, "ahb");
130 cko1 = clk_get_sys(NULL, "cko1");
131 if (IS_ERR(cko1_sel) || IS_ERR(ahb) || IS_ERR(cko1)) {
132 pr_err("cko1 setup failed!\n");
135 clk_set_parent(cko1_sel, ahb);
136 rate = clk_round_rate(cko1, 16000000);
137 clk_set_rate(cko1, rate);
139 if (!IS_ERR(cko1_sel))
147 static void __init imx6q_sabrelite_init(void)
149 if (IS_BUILTIN(CONFIG_PHYLIB))
150 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
151 ksz9021rn_phy_fixup);
152 imx6q_sabrelite_cko1_setup();
155 static void __init imx6q_1588_init(void)
159 gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
161 regmap_update_bits(gpr, 0x4, 1 << 21, 1 << 21);
163 pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");
166 static void __init imx6q_usb_init(void)
168 struct regmap *anatop;
170 #define HW_ANADIG_USB1_CHRG_DETECT 0x000001b0
171 #define HW_ANADIG_USB2_CHRG_DETECT 0x00000210
173 #define BM_ANADIG_USB_CHRG_DETECT_EN_B 0x00100000
174 #define BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B 0x00080000
176 anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop");
177 if (!IS_ERR(anatop)) {
179 * The external charger detector needs to be disabled,
180 * or the signal at DP will be poor
182 regmap_write(anatop, HW_ANADIG_USB1_CHRG_DETECT,
183 BM_ANADIG_USB_CHRG_DETECT_EN_B
184 | BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
185 regmap_write(anatop, HW_ANADIG_USB2_CHRG_DETECT,
186 BM_ANADIG_USB_CHRG_DETECT_EN_B |
187 BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
189 pr_warn("failed to find fsl,imx6q-anatop regmap\n");
193 static void __init imx6q_init_machine(void)
195 if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
196 imx6q_sabrelite_init();
198 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
205 #define OCOTP_CFG3 0x440
206 #define OCOTP_CFG3_SPEED_SHIFT 16
207 #define OCOTP_CFG3_SPEED_1P2GHZ 0x3
209 static void __init imx6q_opp_check_1p2ghz(struct device *cpu_dev)
211 struct device_node *np;
215 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-ocotp");
217 pr_warn("failed to find ocotp node\n");
221 base = of_iomap(np, 0);
223 pr_warn("failed to map ocotp\n");
227 val = readl_relaxed(base + OCOTP_CFG3);
228 val >>= OCOTP_CFG3_SPEED_SHIFT;
229 if ((val & 0x3) != OCOTP_CFG3_SPEED_1P2GHZ)
230 if (opp_disable(cpu_dev, 1200000000))
231 pr_warn("failed to disable 1.2 GHz OPP\n");
237 static void __init imx6q_opp_init(struct device *cpu_dev)
239 struct device_node *np;
241 np = of_find_node_by_path("/cpus/cpu@0");
243 pr_warn("failed to find cpu0 node\n");
247 cpu_dev->of_node = np;
248 if (of_init_opp_table(cpu_dev)) {
249 pr_warn("failed to init OPP table\n");
253 imx6q_opp_check_1p2ghz(cpu_dev);
259 struct platform_device imx6q_cpufreq_pdev = {
260 .name = "imx6q-cpufreq",
263 static void __init imx6q_init_late(void)
266 * WAIT mode is broken on TO 1.0 and 1.1, so there is no point
267 * to run cpuidle on them.
269 if (imx6q_revision() > IMX_CHIP_REVISION_1_1)
270 imx6q_cpuidle_init();
272 if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ)) {
273 imx6q_opp_init(&imx6q_cpufreq_pdev.dev);
274 platform_device_register(&imx6q_cpufreq_pdev);
278 static void __init imx6q_map_io(void)
284 static void __init imx6q_init_irq(void)
286 l2x0_of_init(0, ~0UL);
292 static void __init imx6q_timer_init(void)
295 twd_local_timer_of_register();
296 imx_print_silicon_rev("i.MX6Q", imx6q_revision());
299 static const char *imx6q_dt_compat[] __initdata = {
304 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
305 .smp = smp_ops(imx_smp_ops),
306 .map_io = imx6q_map_io,
307 .init_irq = imx6q_init_irq,
308 .init_time = imx6q_timer_init,
309 .init_machine = imx6q_init_machine,
310 .init_late = imx6q_init_late,
311 .dt_compat = imx6q_dt_compat,
312 .restart = imx6q_restart,