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authorFabio Estevam <fabio.estevam@nxp.com>2018-01-09 10:24:43 -0500
committerShawn Guo <shawnguo@kernel.org>2018-02-12 00:13:02 -0500
commit1f9d1311a3a98e8f5db509a4ff7bf84f7d6a4ca9 (patch)
treec1ee7dfcd5ecdf15b031deae09191f521c174ff9
parent7928b2cbe55b2a410a0f5c1f154610059c57b1b2 (diff)
ARM: imx: Remove epit support
Currently there is no user of EPIT, so remove such unused code. If someone wants to add EPIT support back, then the person needs to create a proper support into drivers/clocksource/ and add device tree support, proper bindings, etc. Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com> Acked-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat
-rw-r--r--arch/arm/mach-imx/Kconfig13
-rw-r--r--arch/arm/mach-imx/Makefile1
-rw-r--r--arch/arm/mach-imx/epit.c228
3 files changed, 0 insertions, 242 deletions
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 782699e67600..1831319a679c 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -32,18 +32,6 @@ config MXC_DEBUG_BOARD
32 data/address de-multiplexing and decode, signal level shift, 32 data/address de-multiplexing and decode, signal level shift,
33 interrupt control and various board functions. 33 interrupt control and various board functions.
34 34
35config HAVE_EPIT
36 bool
37
38config MXC_USE_EPIT
39 bool "Use EPIT instead of GPT"
40 depends on HAVE_EPIT
41 help
42 Use EPIT as the system timer on systems that have it. Normally you
43 don't have a reason to do so as the EPIT has the same features and
44 uses the same clocks as the GPT. Anyway, on some systems the GPT
45 may be in use for other purposes.
46
47config HAVE_IMX_ANATOP 35config HAVE_IMX_ANATOP
48 bool 36 bool
49 37
@@ -85,7 +73,6 @@ config SOC_IMX31
85config SOC_IMX35 73config SOC_IMX35
86 bool 74 bool
87 select ARCH_MXC_IOMUX_V3 75 select ARCH_MXC_IOMUX_V3
88 select HAVE_EPIT
89 select MXC_AVIC 76 select MXC_AVIC
90 select PINCTRL_IMX35 77 select PINCTRL_IMX35
91 78
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index 8ff71058207d..04ba789ca34c 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -20,7 +20,6 @@ obj-$(CONFIG_ARCH_MXC_IOMUX_V3) += iomux-v3.o
20obj-$(CONFIG_MXC_TZIC) += tzic.o 20obj-$(CONFIG_MXC_TZIC) += tzic.o
21obj-$(CONFIG_MXC_AVIC) += avic.o 21obj-$(CONFIG_MXC_AVIC) += avic.o
22 22
23obj-$(CONFIG_MXC_USE_EPIT) += epit.o
24obj-$(CONFIG_MXC_DEBUG_BOARD) += 3ds_debugboard.o 23obj-$(CONFIG_MXC_DEBUG_BOARD) += 3ds_debugboard.o
25 24
26ifeq ($(CONFIG_CPU_IDLE),y) 25ifeq ($(CONFIG_CPU_IDLE),y)
diff --git a/arch/arm/mach-imx/epit.c b/arch/arm/mach-imx/epit.c
deleted file mode 100644
index fb9a73a57d00..000000000000
--- a/arch/arm/mach-imx/epit.c
+++ /dev/null
@@ -1,228 +0,0 @@
1/*
2 * linux/arch/arm/plat-mxc/epit.c
3 *
4 * Copyright (C) 2010 Sascha Hauer <s.hauer@pengutronix.de>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
18 * MA 02110-1301, USA.
19 */
20
21#define EPITCR 0x00
22#define EPITSR 0x04
23#define EPITLR 0x08
24#define EPITCMPR 0x0c
25#define EPITCNR 0x10
26
27#define EPITCR_EN (1 << 0)
28#define EPITCR_ENMOD (1 << 1)
29#define EPITCR_OCIEN (1 << 2)
30#define EPITCR_RLD (1 << 3)
31#define EPITCR_PRESC(x) (((x) & 0xfff) << 4)
32#define EPITCR_SWR (1 << 16)
33#define EPITCR_IOVW (1 << 17)
34#define EPITCR_DBGEN (1 << 18)
35#define EPITCR_WAITEN (1 << 19)
36#define EPITCR_RES (1 << 20)
37#define EPITCR_STOPEN (1 << 21)
38#define EPITCR_OM_DISCON (0 << 22)
39#define EPITCR_OM_TOGGLE (1 << 22)
40#define EPITCR_OM_CLEAR (2 << 22)
41#define EPITCR_OM_SET (3 << 22)
42#define EPITCR_CLKSRC_OFF (0 << 24)
43#define EPITCR_CLKSRC_PERIPHERAL (1 << 24)
44#define EPITCR_CLKSRC_REF_HIGH (1 << 24)
45#define EPITCR_CLKSRC_REF_LOW (3 << 24)
46
47#define EPITSR_OCIF (1 << 0)
48
49#include <linux/interrupt.h>
50#include <linux/irq.h>
51#include <linux/clockchips.h>
52#include <linux/clk.h>
53#include <linux/err.h>
54#include <asm/mach/time.h>
55
56#include "common.h"
57#include "hardware.h"
58
59static struct clock_event_device clockevent_epit;
60
61static void __iomem *timer_base;
62
63static inline void epit_irq_disable(void)
64{
65 u32 val;
66
67 val = imx_readl(timer_base + EPITCR);
68 val &= ~EPITCR_OCIEN;
69 imx_writel(val, timer_base + EPITCR);
70}
71
72static inline void epit_irq_enable(void)
73{
74 u32 val;
75
76 val = imx_readl(timer_base + EPITCR);
77 val |= EPITCR_OCIEN;
78 imx_writel(val, timer_base + EPITCR);
79}
80
81static void epit_irq_acknowledge(void)
82{
83 imx_writel(EPITSR_OCIF, timer_base + EPITSR);
84}
85
86static int __init epit_clocksource_init(struct clk *timer_clk)
87{
88 unsigned int c = clk_get_rate(timer_clk);
89
90 return clocksource_mmio_init(timer_base + EPITCNR, "epit", c, 200, 32,
91 clocksource_mmio_readl_down);
92}
93
94/* clock event */
95
96static int epit_set_next_event(unsigned long evt,
97 struct clock_event_device *unused)
98{
99 unsigned long tcmp;
100
101 tcmp = imx_readl(timer_base + EPITCNR);
102
103 imx_writel(tcmp - evt, timer_base + EPITCMPR);
104
105 return 0;
106}
107
108/* Left event sources disabled, no more interrupts appear */
109static int epit_shutdown(struct clock_event_device *evt)
110{
111 unsigned long flags;
112
113 /*
114 * The timer interrupt generation is disabled at least
115 * for enough time to call epit_set_next_event()
116 */
117 local_irq_save(flags);
118
119 /* Disable interrupt in GPT module */
120 epit_irq_disable();
121
122 /* Clear pending interrupt */
123 epit_irq_acknowledge();
124
125 local_irq_restore(flags);
126
127 return 0;
128}
129
130static int epit_set_oneshot(struct clock_event_device *evt)
131{
132 unsigned long flags;
133
134 /*
135 * The timer interrupt generation is disabled at least
136 * for enough time to call epit_set_next_event()
137 */
138 local_irq_save(flags);
139
140 /* Disable interrupt in GPT module */
141 epit_irq_disable();
142
143 /* Clear pending interrupt, only while switching mode */
144 if (!clockevent_state_oneshot(evt))
145 epit_irq_acknowledge();
146
147 /*
148 * Do not put overhead of interrupt enable/disable into
149 * epit_set_next_event(), the core has about 4 minutes
150 * to call epit_set_next_event() or shutdown clock after
151 * mode switching
152 */
153 epit_irq_enable();
154 local_irq_restore(flags);
155
156 return 0;
157}
158
159/*
160 * IRQ handler for the timer
161 */
162static irqreturn_t epit_timer_interrupt(int irq, void *dev_id)
163{
164 struct clock_event_device *evt = &clockevent_epit;
165
166 epit_irq_acknowledge();
167
168 evt->event_handler(evt);
169
170 return IRQ_HANDLED;
171}
172
173static struct irqaction epit_timer_irq = {
174 .name = "i.MX EPIT Timer Tick",
175 .flags = IRQF_TIMER | IRQF_IRQPOLL,
176 .handler = epit_timer_interrupt,
177};
178
179static struct clock_event_device clockevent_epit = {
180 .name = "epit",
181 .features = CLOCK_EVT_FEAT_ONESHOT,
182 .set_state_shutdown = epit_shutdown,
183 .tick_resume = epit_shutdown,
184 .set_state_oneshot = epit_set_oneshot,
185 .set_next_event = epit_set_next_event,
186 .rating = 200,
187};
188
189static int __init epit_clockevent_init(struct clk *timer_clk)
190{
191 clockevent_epit.cpumask = cpumask_of(0);
192 clockevents_config_and_register(&clockevent_epit,
193 clk_get_rate(timer_clk),
194 0x800, 0xfffffffe);
195
196 return 0;
197}
198
199void __init epit_timer_init(void __iomem *base, int irq)
200{
201 struct clk *timer_clk;
202
203 timer_clk = clk_get_sys("imx-epit.0", NULL);
204 if (IS_ERR(timer_clk)) {
205 pr_err("i.MX epit: unable to get clk\n");
206 return;
207 }
208
209 clk_prepare_enable(timer_clk);
210
211 timer_base = base;
212
213 /*
214 * Initialise to a known state (all timers off, and timing reset)
215 */
216 imx_writel(0x0, timer_base + EPITCR);
217
218 imx_writel(0xffffffff, timer_base + EPITLR);
219 imx_writel(EPITCR_EN | EPITCR_CLKSRC_REF_HIGH | EPITCR_WAITEN,
220 timer_base + EPITCR);
221
222 /* init and register the timer to the framework */
223 epit_clocksource_init(timer_clk);
224 epit_clockevent_init(timer_clk);
225
226 /* Make irqs happen */
227 setup_irq(irq, &epit_timer_irq);
228}
generated by cgit v1.2.2 (git 2.25.0) at 2025-10-01 04:29:51 -0400