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/clocksource.h>
16 #include <linux/cpu.h>
17 #include <linux/delay.h>
18 #include <linux/export.h>
19 #include <linux/init.h>
21 #include <linux/irq.h>
22 #include <linux/irqchip.h>
24 #include <linux/of_address.h>
25 #include <linux/of_irq.h>
26 #include <linux/of_platform.h>
27 #include <linux/opp.h>
28 #include <linux/phy.h>
29 #include <linux/regmap.h>
30 #include <linux/micrel_phy.h>
31 #include <linux/mfd/syscon.h>
32 #include <asm/hardware/cache-l2x0.h>
33 #include <asm/mach/arch.h>
34 #include <asm/mach/map.h>
35 #include <asm/system_misc.h>
41 #define IMX6Q_ANALOG_DIGPROG 0x260
43 static int imx6q_revision(void)
45 struct device_node *np;
50 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop");
52 return IMX_CHIP_REVISION_UNKNOWN;
53 base = of_iomap(np, 0);
56 return IMX_CHIP_REVISION_UNKNOWN;
58 rev = readl_relaxed(base + IMX6Q_ANALOG_DIGPROG);
65 return IMX_CHIP_REVISION_1_0;
67 return IMX_CHIP_REVISION_1_1;
69 return IMX_CHIP_REVISION_1_2;
71 return IMX_CHIP_REVISION_UNKNOWN;
75 void imx6q_restart(char mode, const char *cmd)
77 struct device_node *np;
78 void __iomem *wdog_base;
80 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
81 wdog_base = of_iomap(np, 0);
85 imx_src_prepare_restart();
88 writew_relaxed(1 << 2, wdog_base);
89 /* write twice to ensure the request will not get ignored */
90 writew_relaxed(1 << 2, wdog_base);
92 /* wait for reset to assert ... */
95 pr_err("Watchdog reset failed to assert reset\n");
97 /* delay to allow the serial port to show the message */
101 /* we'll take a jump through zero as a poor second */
105 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
106 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
108 if (IS_BUILTIN(CONFIG_PHYLIB)) {
109 /* min rx data delay */
110 phy_write(phydev, 0x0b, 0x8105);
111 phy_write(phydev, 0x0c, 0x0000);
113 /* max rx/tx clock delay, min rx/tx control delay */
114 phy_write(phydev, 0x0b, 0x8104);
115 phy_write(phydev, 0x0c, 0xf0f0);
116 phy_write(phydev, 0x0b, 0x104);
122 static void __init imx6q_sabrelite_cko1_setup(void)
124 struct clk *cko1_sel, *ahb, *cko1;
127 cko1_sel = clk_get_sys(NULL, "cko1_sel");
128 ahb = clk_get_sys(NULL, "ahb");
129 cko1 = clk_get_sys(NULL, "cko1");
130 if (IS_ERR(cko1_sel) || IS_ERR(ahb) || IS_ERR(cko1)) {
131 pr_err("cko1 setup failed!\n");
134 clk_set_parent(cko1_sel, ahb);
135 rate = clk_round_rate(cko1, 16000000);
136 clk_set_rate(cko1, rate);
138 if (!IS_ERR(cko1_sel))
146 static void __init imx6q_sabrelite_init(void)
148 if (IS_BUILTIN(CONFIG_PHYLIB))
149 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
150 ksz9021rn_phy_fixup);
151 imx6q_sabrelite_cko1_setup();
154 static void __init imx6q_1588_init(void)
158 gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
160 regmap_update_bits(gpr, 0x4, 1 << 21, 1 << 21);
162 pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");
165 static void __init imx6q_usb_init(void)
167 struct regmap *anatop;
169 #define HW_ANADIG_USB1_CHRG_DETECT 0x000001b0
170 #define HW_ANADIG_USB2_CHRG_DETECT 0x00000210
172 #define BM_ANADIG_USB_CHRG_DETECT_EN_B 0x00100000
173 #define BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B 0x00080000
175 anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop");
176 if (!IS_ERR(anatop)) {
178 * The external charger detector needs to be disabled,
179 * or the signal at DP will be poor
181 regmap_write(anatop, HW_ANADIG_USB1_CHRG_DETECT,
182 BM_ANADIG_USB_CHRG_DETECT_EN_B
183 | BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
184 regmap_write(anatop, HW_ANADIG_USB2_CHRG_DETECT,
185 BM_ANADIG_USB_CHRG_DETECT_EN_B |
186 BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
188 pr_warn("failed to find fsl,imx6q-anatop regmap\n");
192 static void __init imx6q_init_machine(void)
194 if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
195 imx6q_sabrelite_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 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 l2x0_of_init(0, ~0UL);
291 static void __init imx6q_timer_init(void)
294 clocksource_of_init();
295 imx_print_silicon_rev("i.MX6Q", imx6q_revision());
298 static const char *imx6q_dt_compat[] __initdata = {
303 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
304 .smp = smp_ops(imx_smp_ops),
305 .map_io = imx6q_map_io,
306 .init_irq = imx6q_init_irq,
307 .init_time = imx6q_timer_init,
308 .init_machine = imx6q_init_machine,
309 .init_late = imx6q_init_late,
310 .dt_compat = imx6q_dt_compat,
311 .restart = imx6q_restart,