cpufreq: imx6q-cpufreq: remove device tree parsing for cpu nodes
[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/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>
21 #include <linux/io.h>
22 #include <linux/irq.h>
23 #include <linux/irqchip.h>
24 #include <linux/of.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 <asm/hardware/cache-l2x0.h>
35 #include <asm/mach/arch.h>
36 #include <asm/mach/map.h>
37 #include <asm/system_misc.h>
38
39 #include "common.h"
40 #include "cpuidle.h"
41 #include "hardware.h"
42
43 static u32 chip_revision;
44
45 int imx6q_revision(void)
46 {
47         return chip_revision;
48 }
49
50 static void __init imx6q_init_revision(void)
51 {
52         u32 rev = imx_anatop_get_digprog();
53
54         switch (rev & 0xff) {
55         case 0:
56                 chip_revision = IMX_CHIP_REVISION_1_0;
57                 break;
58         case 1:
59                 chip_revision = IMX_CHIP_REVISION_1_1;
60                 break;
61         case 2:
62                 chip_revision = IMX_CHIP_REVISION_1_2;
63                 break;
64         default:
65                 chip_revision = IMX_CHIP_REVISION_UNKNOWN;
66         }
67
68         mxc_set_cpu_type(rev >> 16 & 0xff);
69 }
70
71 static void imx6q_restart(enum reboot_mode mode, const char *cmd)
72 {
73         struct device_node *np;
74         void __iomem *wdog_base;
75
76         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
77         wdog_base = of_iomap(np, 0);
78         if (!wdog_base)
79                 goto soft;
80
81         imx_src_prepare_restart();
82
83         /* enable wdog */
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);
87
88         /* wait for reset to assert ... */
89         mdelay(500);
90
91         pr_err("Watchdog reset failed to assert reset\n");
92
93         /* delay to allow the serial port to show the message */
94         mdelay(50);
95
96 soft:
97         /* we'll take a jump through zero as a poor second */
98         soft_restart(0);
99 }
100
101 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
102 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
103 {
104         if (IS_BUILTIN(CONFIG_PHYLIB)) {
105                 /* min rx data delay */
106                 phy_write(phydev, 0x0b, 0x8105);
107                 phy_write(phydev, 0x0c, 0x0000);
108
109                 /* max rx/tx clock delay, min rx/tx control delay */
110                 phy_write(phydev, 0x0b, 0x8104);
111                 phy_write(phydev, 0x0c, 0xf0f0);
112                 phy_write(phydev, 0x0b, 0x104);
113         }
114
115         return 0;
116 }
117
118 static void __init imx6q_sabrelite_cko1_setup(void)
119 {
120         struct clk *cko1_sel, *ahb, *cko1;
121         unsigned long rate;
122
123         cko1_sel = clk_get_sys(NULL, "cko1_sel");
124         ahb = clk_get_sys(NULL, "ahb");
125         cko1 = clk_get_sys(NULL, "cko1");
126         if (IS_ERR(cko1_sel) || IS_ERR(ahb) || IS_ERR(cko1)) {
127                 pr_err("cko1 setup failed!\n");
128                 goto put_clk;
129         }
130         clk_set_parent(cko1_sel, ahb);
131         rate = clk_round_rate(cko1, 16000000);
132         clk_set_rate(cko1, rate);
133 put_clk:
134         if (!IS_ERR(cko1_sel))
135                 clk_put(cko1_sel);
136         if (!IS_ERR(ahb))
137                 clk_put(ahb);
138         if (!IS_ERR(cko1))
139                 clk_put(cko1);
140 }
141
142 static void __init imx6q_sabrelite_init(void)
143 {
144         if (IS_BUILTIN(CONFIG_PHYLIB))
145                 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
146                                 ksz9021rn_phy_fixup);
147         imx6q_sabrelite_cko1_setup();
148 }
149
150 static void __init imx6q_sabresd_cko1_setup(void)
151 {
152         struct clk *cko1_sel, *pll4, *pll4_post, *cko1;
153         unsigned long rate;
154
155         cko1_sel = clk_get_sys(NULL, "cko1_sel");
156         pll4 = clk_get_sys(NULL, "pll4_audio");
157         pll4_post = clk_get_sys(NULL, "pll4_post_div");
158         cko1 = clk_get_sys(NULL, "cko1");
159         if (IS_ERR(cko1_sel) || IS_ERR(pll4)
160                         || IS_ERR(pll4_post) || IS_ERR(cko1)) {
161                 pr_err("cko1 setup failed!\n");
162                 goto put_clk;
163         }
164         /*
165          * Setting pll4 at 768MHz (24MHz * 32)
166          * So its child clock can get 24MHz easily
167          */
168         clk_set_rate(pll4, 768000000);
169
170         clk_set_parent(cko1_sel, pll4_post);
171         rate = clk_round_rate(cko1, 24000000);
172         clk_set_rate(cko1, rate);
173 put_clk:
174         if (!IS_ERR(cko1_sel))
175                 clk_put(cko1_sel);
176         if (!IS_ERR(pll4_post))
177                 clk_put(pll4_post);
178         if (!IS_ERR(pll4))
179                 clk_put(pll4);
180         if (!IS_ERR(cko1))
181                 clk_put(cko1);
182 }
183
184 static void __init imx6q_sabresd_init(void)
185 {
186         imx6q_sabresd_cko1_setup();
187 }
188
189 static void __init imx6q_1588_init(void)
190 {
191         struct regmap *gpr;
192
193         gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
194         if (!IS_ERR(gpr))
195                 regmap_update_bits(gpr, 0x4, 1 << 21, 1 << 21);
196         else
197                 pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");
198
199 }
200 static void __init imx6q_usb_init(void)
201 {
202         imx_anatop_usb_chrg_detect_disable();
203 }
204
205 static void __init imx6q_init_machine(void)
206 {
207         if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
208                 imx6q_sabrelite_init();
209         else if (of_machine_is_compatible("fsl,imx6q-sabresd") ||
210                         of_machine_is_compatible("fsl,imx6dl-sabresd"))
211                 imx6q_sabresd_init();
212
213         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
214
215         imx_anatop_init();
216         imx6q_pm_init();
217         imx6q_usb_init();
218         imx6q_1588_init();
219 }
220
221 #define OCOTP_CFG3                      0x440
222 #define OCOTP_CFG3_SPEED_SHIFT          16
223 #define OCOTP_CFG3_SPEED_1P2GHZ         0x3
224
225 static void __init imx6q_opp_check_1p2ghz(struct device *cpu_dev)
226 {
227         struct device_node *np;
228         void __iomem *base;
229         u32 val;
230
231         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-ocotp");
232         if (!np) {
233                 pr_warn("failed to find ocotp node\n");
234                 return;
235         }
236
237         base = of_iomap(np, 0);
238         if (!base) {
239                 pr_warn("failed to map ocotp\n");
240                 goto put_node;
241         }
242
243         val = readl_relaxed(base + OCOTP_CFG3);
244         val >>= OCOTP_CFG3_SPEED_SHIFT;
245         if ((val & 0x3) != OCOTP_CFG3_SPEED_1P2GHZ)
246                 if (opp_disable(cpu_dev, 1200000000))
247                         pr_warn("failed to disable 1.2 GHz OPP\n");
248
249 put_node:
250         of_node_put(np);
251 }
252
253 static void __init imx6q_opp_init(struct device *cpu_dev)
254 {
255         struct device_node *np;
256
257         np = of_node_get(cpu_dev->of_node);
258         if (!np) {
259                 pr_warn("failed to find cpu0 node\n");
260                 return;
261         }
262
263         if (of_init_opp_table(cpu_dev)) {
264                 pr_warn("failed to init OPP table\n");
265                 goto put_node;
266         }
267
268         imx6q_opp_check_1p2ghz(cpu_dev);
269
270 put_node:
271         of_node_put(np);
272 }
273
274 static struct platform_device imx6q_cpufreq_pdev = {
275         .name = "imx6q-cpufreq",
276 };
277
278 static void __init imx6q_init_late(void)
279 {
280         /*
281          * WAIT mode is broken on TO 1.0 and 1.1, so there is no point
282          * to run cpuidle on them.
283          */
284         if (imx6q_revision() > IMX_CHIP_REVISION_1_1)
285                 imx6q_cpuidle_init();
286
287         if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ)) {
288                 imx6q_opp_init(&imx6q_cpufreq_pdev.dev);
289                 platform_device_register(&imx6q_cpufreq_pdev);
290         }
291 }
292
293 static void __init imx6q_map_io(void)
294 {
295         debug_ll_io_init();
296         imx_scu_map_io();
297 }
298
299 #ifdef CONFIG_CACHE_L2X0
300 static void __init imx6q_init_l2cache(void)
301 {
302         void __iomem *l2x0_base;
303         struct device_node *np;
304         unsigned int val;
305
306         np = of_find_compatible_node(NULL, NULL, "arm,pl310-cache");
307         if (!np)
308                 goto out;
309
310         l2x0_base = of_iomap(np, 0);
311         if (!l2x0_base) {
312                 of_node_put(np);
313                 goto out;
314         }
315
316         /* Configure the L2 PREFETCH and POWER registers */
317         val = readl_relaxed(l2x0_base + L2X0_PREFETCH_CTRL);
318         val |= 0x70800000;
319         writel_relaxed(val, l2x0_base + L2X0_PREFETCH_CTRL);
320         val = L2X0_DYNAMIC_CLK_GATING_EN | L2X0_STNDBY_MODE_EN;
321         writel_relaxed(val, l2x0_base + L2X0_POWER_CTRL);
322
323         iounmap(l2x0_base);
324         of_node_put(np);
325
326 out:
327         l2x0_of_init(0, ~0UL);
328 }
329 #else
330 static inline void imx6q_init_l2cache(void) {}
331 #endif
332
333 static void __init imx6q_init_irq(void)
334 {
335         imx6q_init_revision();
336         imx6q_init_l2cache();
337         imx_src_init();
338         imx_gpc_init();
339         irqchip_init();
340 }
341
342 static void __init imx6q_timer_init(void)
343 {
344         of_clk_init(NULL);
345         clocksource_of_init();
346         imx_print_silicon_rev(cpu_is_imx6dl() ? "i.MX6DL" : "i.MX6Q",
347                               imx6q_revision());
348 }
349
350 static const char *imx6q_dt_compat[] __initdata = {
351         "fsl,imx6dl",
352         "fsl,imx6q",
353         NULL,
354 };
355
356 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad/DualLite (Device Tree)")
357         .smp            = smp_ops(imx_smp_ops),
358         .map_io         = imx6q_map_io,
359         .init_irq       = imx6q_init_irq,
360         .init_time      = imx6q_timer_init,
361         .init_machine   = imx6q_init_machine,
362         .init_late      = imx6q_init_late,
363         .dt_compat      = imx6q_dt_compat,
364         .restart        = imx6q_restart,
365 MACHINE_END