Merge tag 'imx-soc-3.10' of git://git.linaro.org/people/shawnguo/linux-2.6 into next...
[firefly-linux-kernel-4.4.55.git] / arch / arm / mach-imx / mach-imx6q.c
1 /*
2  * Copyright 2011-2013 Freescale Semiconductor, Inc.
3  * Copyright 2011 Linaro Ltd.
4  *
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:
8  *
9  * http://www.opensource.org/licenses/gpl-license.html
10  * http://www.gnu.org/copyleft/gpl.html
11  */
12
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>
20 #include <linux/io.h>
21 #include <linux/irq.h>
22 #include <linux/irqchip.h>
23 #include <linux/of.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>
36
37 #include "common.h"
38 #include "cpuidle.h"
39 #include "hardware.h"
40
41 static u32 chip_revision;
42
43 int imx6q_revision(void)
44 {
45         return chip_revision;
46 }
47
48 static void __init imx6q_init_revision(void)
49 {
50         u32 rev = imx_anatop_get_digprog();
51
52         switch (rev & 0xff) {
53         case 0:
54                 chip_revision = IMX_CHIP_REVISION_1_0;
55                 break;
56         case 1:
57                 chip_revision = IMX_CHIP_REVISION_1_1;
58                 break;
59         case 2:
60                 chip_revision = IMX_CHIP_REVISION_1_2;
61                 break;
62         default:
63                 chip_revision = IMX_CHIP_REVISION_UNKNOWN;
64         }
65
66         mxc_set_cpu_type(rev >> 16 & 0xff);
67 }
68
69 void imx6q_restart(char mode, const char *cmd)
70 {
71         struct device_node *np;
72         void __iomem *wdog_base;
73
74         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
75         wdog_base = of_iomap(np, 0);
76         if (!wdog_base)
77                 goto soft;
78
79         imx_src_prepare_restart();
80
81         /* enable wdog */
82         writew_relaxed(1 << 2, wdog_base);
83         /* write twice to ensure the request will not get ignored */
84         writew_relaxed(1 << 2, wdog_base);
85
86         /* wait for reset to assert ... */
87         mdelay(500);
88
89         pr_err("Watchdog reset failed to assert reset\n");
90
91         /* delay to allow the serial port to show the message */
92         mdelay(50);
93
94 soft:
95         /* we'll take a jump through zero as a poor second */
96         soft_restart(0);
97 }
98
99 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
100 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
101 {
102         if (IS_BUILTIN(CONFIG_PHYLIB)) {
103                 /* min rx data delay */
104                 phy_write(phydev, 0x0b, 0x8105);
105                 phy_write(phydev, 0x0c, 0x0000);
106
107                 /* max rx/tx clock delay, min rx/tx control delay */
108                 phy_write(phydev, 0x0b, 0x8104);
109                 phy_write(phydev, 0x0c, 0xf0f0);
110                 phy_write(phydev, 0x0b, 0x104);
111         }
112
113         return 0;
114 }
115
116 static void __init imx6q_sabrelite_cko1_setup(void)
117 {
118         struct clk *cko1_sel, *ahb, *cko1;
119         unsigned long rate;
120
121         cko1_sel = clk_get_sys(NULL, "cko1_sel");
122         ahb = clk_get_sys(NULL, "ahb");
123         cko1 = clk_get_sys(NULL, "cko1");
124         if (IS_ERR(cko1_sel) || IS_ERR(ahb) || IS_ERR(cko1)) {
125                 pr_err("cko1 setup failed!\n");
126                 goto put_clk;
127         }
128         clk_set_parent(cko1_sel, ahb);
129         rate = clk_round_rate(cko1, 16000000);
130         clk_set_rate(cko1, rate);
131 put_clk:
132         if (!IS_ERR(cko1_sel))
133                 clk_put(cko1_sel);
134         if (!IS_ERR(ahb))
135                 clk_put(ahb);
136         if (!IS_ERR(cko1))
137                 clk_put(cko1);
138 }
139
140 static void __init imx6q_sabrelite_init(void)
141 {
142         if (IS_BUILTIN(CONFIG_PHYLIB))
143                 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
144                                 ksz9021rn_phy_fixup);
145         imx6q_sabrelite_cko1_setup();
146 }
147
148 static void __init imx6q_1588_init(void)
149 {
150         struct regmap *gpr;
151
152         gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
153         if (!IS_ERR(gpr))
154                 regmap_update_bits(gpr, 0x4, 1 << 21, 1 << 21);
155         else
156                 pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");
157
158 }
159 static void __init imx6q_usb_init(void)
160 {
161         imx_anatop_usb_chrg_detect_disable();
162 }
163
164 static void __init imx6q_init_machine(void)
165 {
166         if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
167                 imx6q_sabrelite_init();
168
169         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
170
171         imx_anatop_init();
172         imx6q_pm_init();
173         imx6q_usb_init();
174         imx6q_1588_init();
175 }
176
177 #define OCOTP_CFG3                      0x440
178 #define OCOTP_CFG3_SPEED_SHIFT          16
179 #define OCOTP_CFG3_SPEED_1P2GHZ         0x3
180
181 static void __init imx6q_opp_check_1p2ghz(struct device *cpu_dev)
182 {
183         struct device_node *np;
184         void __iomem *base;
185         u32 val;
186
187         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-ocotp");
188         if (!np) {
189                 pr_warn("failed to find ocotp node\n");
190                 return;
191         }
192
193         base = of_iomap(np, 0);
194         if (!base) {
195                 pr_warn("failed to map ocotp\n");
196                 goto put_node;
197         }
198
199         val = readl_relaxed(base + OCOTP_CFG3);
200         val >>= OCOTP_CFG3_SPEED_SHIFT;
201         if ((val & 0x3) != OCOTP_CFG3_SPEED_1P2GHZ)
202                 if (opp_disable(cpu_dev, 1200000000))
203                         pr_warn("failed to disable 1.2 GHz OPP\n");
204
205 put_node:
206         of_node_put(np);
207 }
208
209 static void __init imx6q_opp_init(struct device *cpu_dev)
210 {
211         struct device_node *np;
212
213         np = of_find_node_by_path("/cpus/cpu@0");
214         if (!np) {
215                 pr_warn("failed to find cpu0 node\n");
216                 return;
217         }
218
219         cpu_dev->of_node = np;
220         if (of_init_opp_table(cpu_dev)) {
221                 pr_warn("failed to init OPP table\n");
222                 goto put_node;
223         }
224
225         imx6q_opp_check_1p2ghz(cpu_dev);
226
227 put_node:
228         of_node_put(np);
229 }
230
231 struct platform_device imx6q_cpufreq_pdev = {
232         .name = "imx6q-cpufreq",
233 };
234
235 static void __init imx6q_init_late(void)
236 {
237         /*
238          * WAIT mode is broken on TO 1.0 and 1.1, so there is no point
239          * to run cpuidle on them.
240          */
241         if (imx6q_revision() > IMX_CHIP_REVISION_1_1)
242                 imx6q_cpuidle_init();
243
244         if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ)) {
245                 imx6q_opp_init(&imx6q_cpufreq_pdev.dev);
246                 platform_device_register(&imx6q_cpufreq_pdev);
247         }
248 }
249
250 static void __init imx6q_map_io(void)
251 {
252         debug_ll_io_init();
253         imx_scu_map_io();
254 }
255
256 static void __init imx6q_init_irq(void)
257 {
258         imx6q_init_revision();
259         l2x0_of_init(0, ~0UL);
260         imx_src_init();
261         imx_gpc_init();
262         irqchip_init();
263 }
264
265 static void __init imx6q_timer_init(void)
266 {
267         mx6q_clocks_init();
268         clocksource_of_init();
269         imx_print_silicon_rev(cpu_is_imx6dl() ? "i.MX6DL" : "i.MX6Q",
270                               imx6q_revision());
271 }
272
273 static const char *imx6q_dt_compat[] __initdata = {
274         "fsl,imx6dl",
275         "fsl,imx6q",
276         NULL,
277 };
278
279 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad/DualLite (Device Tree)")
280         .smp            = smp_ops(imx_smp_ops),
281         .map_io         = imx6q_map_io,
282         .init_irq       = imx6q_init_irq,
283         .init_time      = imx6q_timer_init,
284         .init_machine   = imx6q_init_machine,
285         .init_late      = imx6q_init_late,
286         .dt_compat      = imx6q_dt_compat,
287         .restart        = imx6q_restart,
288 MACHINE_END