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[karo-tx-linux.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/cpu.h>
16 #include <linux/delay.h>
17 #include <linux/export.h>
18 #include <linux/init.h>
19 #include <linux/io.h>
20 #include <linux/irq.h>
21 #include <linux/irqchip.h>
22 #include <linux/of.h>
23 #include <linux/of_address.h>
24 #include <linux/of_irq.h>
25 #include <linux/of_platform.h>
26 #include <linux/pci.h>
27 #include <linux/phy.h>
28 #include <linux/pm_opp.h>
29 #include <linux/reboot.h>
30 #include <linux/regmap.h>
31 #include <linux/micrel_phy.h>
32 #include <linux/mfd/syscon.h>
33 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
34 #include <asm/mach/arch.h>
35 #include <asm/mach/map.h>
36 #include <asm/system_misc.h>
37
38 #include "common.h"
39 #include "cpuidle.h"
40 #include "hardware.h"
41
42 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
43 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
44 {
45         if (IS_BUILTIN(CONFIG_PHYLIB)) {
46                 /* min rx data delay */
47                 phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL,
48                         0x8000 | MICREL_KSZ9021_RGMII_RX_DATA_PAD_SCEW);
49                 phy_write(phydev, MICREL_KSZ9021_EXTREG_DATA_WRITE, 0x0000);
50
51                 /* max rx/tx clock delay, min rx/tx control delay */
52                 phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL,
53                         0x8000 | MICREL_KSZ9021_RGMII_CLK_CTRL_PAD_SCEW);
54                 phy_write(phydev, MICREL_KSZ9021_EXTREG_DATA_WRITE, 0xf0f0);
55                 phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL,
56                         MICREL_KSZ9021_RGMII_CLK_CTRL_PAD_SCEW);
57         }
58
59         return 0;
60 }
61
62 static void mmd_write_reg(struct phy_device *dev, int device, int reg, int val)
63 {
64         phy_write(dev, 0x0d, device);
65         phy_write(dev, 0x0e, reg);
66         phy_write(dev, 0x0d, (1 << 14) | device);
67         phy_write(dev, 0x0e, val);
68 }
69
70 static int ksz9031rn_phy_fixup(struct phy_device *dev)
71 {
72         /*
73          * min rx data delay, max rx/tx clock delay,
74          * min rx/tx control delay
75          */
76         mmd_write_reg(dev, 2, 4, 0);
77         mmd_write_reg(dev, 2, 5, 0);
78         mmd_write_reg(dev, 2, 8, 0x003ff);
79
80         return 0;
81 }
82
83 /*
84  * fixup for PLX PEX8909 bridge to configure GPIO1-7 as output High
85  * as they are used for slots1-7 PERST#
86  */
87 static void ventana_pciesw_early_fixup(struct pci_dev *dev)
88 {
89         u32 dw;
90
91         if (!of_machine_is_compatible("gw,ventana"))
92                 return;
93
94         if (dev->devfn != 0)
95                 return;
96
97         pci_read_config_dword(dev, 0x62c, &dw);
98         dw |= 0xaaa8; // GPIO1-7 outputs
99         pci_write_config_dword(dev, 0x62c, dw);
100
101         pci_read_config_dword(dev, 0x644, &dw);
102         dw |= 0xfe;   // GPIO1-7 output high
103         pci_write_config_dword(dev, 0x644, dw);
104
105         msleep(100);
106 }
107 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8609, ventana_pciesw_early_fixup);
108 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8606, ventana_pciesw_early_fixup);
109 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8604, ventana_pciesw_early_fixup);
110
111 static int ar8031_phy_fixup(struct phy_device *dev)
112 {
113         u16 val;
114
115         /* To enable AR8031 output a 125MHz clk from CLK_25M */
116         phy_write(dev, 0xd, 0x7);
117         phy_write(dev, 0xe, 0x8016);
118         phy_write(dev, 0xd, 0x4007);
119
120         val = phy_read(dev, 0xe);
121         val &= 0xffe3;
122         val |= 0x18;
123         phy_write(dev, 0xe, val);
124
125         /* introduce tx clock delay */
126         phy_write(dev, 0x1d, 0x5);
127         val = phy_read(dev, 0x1e);
128         val |= 0x0100;
129         phy_write(dev, 0x1e, val);
130
131         return 0;
132 }
133
134 #define PHY_ID_AR8031   0x004dd074
135
136 static void __init imx6q_enet_phy_init(void)
137 {
138         if (IS_BUILTIN(CONFIG_PHYLIB)) {
139                 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
140                                 ksz9021rn_phy_fixup);
141                 phy_register_fixup_for_uid(PHY_ID_KSZ9031, MICREL_PHY_ID_MASK,
142                                 ksz9031rn_phy_fixup);
143                 phy_register_fixup_for_uid(PHY_ID_AR8031, 0xffffffff,
144                                 ar8031_phy_fixup);
145         }
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, IOMUXC_GPR1,
155                                 IMX6Q_GPR1_ENET_CLK_SEL_MASK,
156                                 IMX6Q_GPR1_ENET_CLK_SEL_ANATOP);
157         else
158                 pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");
159
160 }
161
162 static void __init imx6q_init_machine(void)
163 {
164         struct device *parent;
165
166         imx_print_silicon_rev(cpu_is_imx6dl() ? "i.MX6DL" : "i.MX6Q",
167                               imx_get_soc_revision());
168
169         mxc_arch_reset_init_dt();
170
171         parent = imx_soc_device_init();
172         if (parent == NULL)
173                 pr_warn("failed to initialize soc device\n");
174
175         imx6q_enet_phy_init();
176
177         of_platform_populate(NULL, of_default_bus_match_table, NULL, parent);
178
179         imx_anatop_init();
180         imx6q_pm_init();
181         imx6q_1588_init();
182 }
183
184 #define OCOTP_CFG3                      0x440
185 #define OCOTP_CFG3_SPEED_SHIFT          16
186 #define OCOTP_CFG3_SPEED_1P2GHZ         0x3
187
188 static void __init imx6q_opp_check_1p2ghz(struct device *cpu_dev)
189 {
190         struct device_node *np;
191         void __iomem *base;
192         u32 val;
193
194         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-ocotp");
195         if (!np) {
196                 pr_warn("failed to find ocotp node\n");
197                 return;
198         }
199
200         base = of_iomap(np, 0);
201         if (!base) {
202                 pr_warn("failed to map ocotp\n");
203                 goto put_node;
204         }
205
206         val = readl_relaxed(base + OCOTP_CFG3);
207         val >>= OCOTP_CFG3_SPEED_SHIFT;
208         if ((val & 0x3) != OCOTP_CFG3_SPEED_1P2GHZ)
209                 if (dev_pm_opp_disable(cpu_dev, 1200000000))
210                         pr_warn("failed to disable 1.2 GHz OPP\n");
211
212 put_node:
213         of_node_put(np);
214 }
215
216 static void __init imx6q_opp_init(void)
217 {
218         struct device_node *np;
219         struct device *cpu_dev = get_cpu_device(0);
220
221         if (!cpu_dev) {
222                 pr_warn("failed to get cpu0 device\n");
223                 return;
224         }
225         np = of_node_get(cpu_dev->of_node);
226         if (!np) {
227                 pr_warn("failed to find cpu0 node\n");
228                 return;
229         }
230
231         if (of_init_opp_table(cpu_dev)) {
232                 pr_warn("failed to init OPP table\n");
233                 goto put_node;
234         }
235
236         imx6q_opp_check_1p2ghz(cpu_dev);
237
238 put_node:
239         of_node_put(np);
240 }
241
242 static struct platform_device imx6q_cpufreq_pdev = {
243         .name = "imx6q-cpufreq",
244 };
245
246 static void __init imx6q_init_late(void)
247 {
248         /*
249          * WAIT mode is broken on TO 1.0 and 1.1, so there is no point
250          * to run cpuidle on them.
251          */
252         if (imx_get_soc_revision() > IMX_CHIP_REVISION_1_1)
253                 imx6q_cpuidle_init();
254
255         if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ)) {
256                 imx6q_opp_init();
257                 platform_device_register(&imx6q_cpufreq_pdev);
258         }
259 }
260
261 static void __init imx6q_map_io(void)
262 {
263         debug_ll_io_init();
264         imx_scu_map_io();
265 }
266
267 static void __init imx6q_init_irq(void)
268 {
269         imx_init_revision_from_anatop();
270         imx_init_l2cache();
271         imx_src_init();
272         imx_gpc_init();
273         irqchip_init();
274 }
275
276 static const char *imx6q_dt_compat[] __initdata = {
277         "fsl,imx6dl",
278         "fsl,imx6q",
279         NULL,
280 };
281
282 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad/DualLite (Device Tree)")
283         .smp            = smp_ops(imx_smp_ops),
284         .map_io         = imx6q_map_io,
285         .init_irq       = imx6q_init_irq,
286         .init_machine   = imx6q_init_machine,
287         .init_late      = imx6q_init_late,
288         .dt_compat      = imx6q_dt_compat,
289         .restart        = mxc_restart,
290 MACHINE_END