ARM: shmobile: r8a7791 CMT support

Add r8a7791 CMT support via channel 0 of CMT0. At this
point the CMT is used for clock event operation, but in
the future the arch timer will be the main timer and the
CMT will be used for deep sleep wake up only.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
(cherry picked from commit a7663b88280d00359715817620798e99d54d401c)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

3 files changed, 36 insertions, 1 deletions

diff --git a/arch/arm/mach-shmobile/clock-r8a7791.c b/arch/arm/mach-shmobile/clock-r8a7791.c
index df3122ea4c69..c9a26f16ce5b 100644
--- a/arch/arm/mach-shmobile/clock-r8a7791.c
+++ b/arch/arm/mach-shmobile/clock-r8a7791.c
@@ -101,7 +101,7 @@ SH_FIXED_RATIO_CLK_SET(cp_clk,			extal_clk,	1, 2);
 SH_FIXED_RATIO_CLK_SET(pll1_div2_clk,		pll1_clk,	1, 2);
 SH_FIXED_RATIO_CLK_SET(hp_clk,			pll1_clk,	1, 12);
 SH_FIXED_RATIO_CLK_SET(p_clk,			pll1_clk,	1, 24);
-
+SH_FIXED_RATIO_CLK_SET(rclk_clk,		pll1_clk,	1, (48 * 1024));
 SH_FIXED_RATIO_CLK_SET(mp_clk,			pll1_div2_clk,	1, 15);
 
 static struct clk *main_clks[] = {
@@ -113,6 +113,7 @@ static struct clk *main_clks[] = {
 	&pll3_clk,
 	&hp_clk,
 	&p_clk,
+	&rclk_clk,
 	&mp_clk,
 	&cp_clk,
 };
@@ -123,6 +124,7 @@ enum {
 	MSTP719, MSTP718, MSTP715, MSTP714,
 	MSTP216, MSTP207, MSTP206,
 	MSTP204, MSTP203, MSTP202, MSTP1105, MSTP1106, MSTP1107,
+	MSTP124,
 	MSTP_NR
 };
 
@@ -142,6 +144,7 @@ static struct clk mstp_clks[MSTP_NR] = {
 	[MSTP1105] = SH_CLK_MSTP32(&mp_clk, SMSTPCR11, 5, 0), /* SCIFA3 */
 	[MSTP1106] = SH_CLK_MSTP32(&mp_clk, SMSTPCR11, 6, 0), /* SCIFA4 */
 	[MSTP1107] = SH_CLK_MSTP32(&mp_clk, SMSTPCR11, 7, 0), /* SCIFA5 */
+	[MSTP124] = SH_CLK_MSTP32(&rclk_clk, SMSTPCR1, 24, 0), /* CMT0 */
 };
 
 static struct clk_lookup lookups[] = {
@@ -155,6 +158,7 @@ static struct clk_lookup lookups[] = {
 	CLKDEV_CON_ID("pll3",		&pll3_clk),
 	CLKDEV_CON_ID("hp",		&hp_clk),
 	CLKDEV_CON_ID("p",		&p_clk),
+	CLKDEV_CON_ID("rclk",		&rclk_clk),
 	CLKDEV_CON_ID("mp",		&mp_clk),
 	CLKDEV_CON_ID("cp",		&cp_clk),
 	CLKDEV_CON_ID("peripheral_clk", &hp_clk),
@@ -175,6 +179,7 @@ static struct clk_lookup lookups[] = {
 	CLKDEV_DEV_ID("sh-sci.12", &mstp_clks[MSTP1105]), /* SCIFA3 */
 	CLKDEV_DEV_ID("sh-sci.13", &mstp_clks[MSTP1106]), /* SCIFA4 */
 	CLKDEV_DEV_ID("sh-sci.14", &mstp_clks[MSTP1107]), /* SCIFA5 */
+	CLKDEV_DEV_ID("sh_cmt.0", &mstp_clks[MSTP124]),
 };
 
 #define R8A7791_CLOCK_ROOT(e, m, p0, p1, p30, p31)		\
diff --git a/arch/arm/mach-shmobile/include/mach/r8a7791.h b/arch/arm/mach-shmobile/include/mach/r8a7791.h
index d234b8cd9e91..2e6d66131083 100644
--- a/arch/arm/mach-shmobile/include/mach/r8a7791.h
+++ b/arch/arm/mach-shmobile/include/mach/r8a7791.h
@@ -3,5 +3,6 @@
 
 void r8a7791_add_dt_devices(void);
 void r8a7791_clock_init(void);
+void r8a7791_init_early(void);
 
 #endif /* __ASM_R8A7791_H__ */
diff --git a/arch/arm/mach-shmobile/setup-r8a7791.c b/arch/arm/mach-shmobile/setup-r8a7791.c
index 0de6aec3bb63..b56399d2e1de 100644
--- a/arch/arm/mach-shmobile/setup-r8a7791.c
+++ b/arch/arm/mach-shmobile/setup-r8a7791.c
@@ -23,6 +23,7 @@
 #include <linux/kernel.h>
 #include <linux/of_platform.h>
 #include <linux/serial_sci.h>
+#include <linux/sh_timer.h>
 #include <mach/common.h>
 #include <mach/irqs.h>
 #include <mach/r8a7791.h>
@@ -89,6 +90,25 @@ static inline void r8a7791_register_scif(int idx)
 				      sizeof(struct plat_sci_port));
 }
 
+static const struct sh_timer_config cmt00_platform_data __initconst = {
+	.name = "CMT00",
+	.timer_bit = 0,
+	.clockevent_rating = 80,
+};
+
+static const struct resource cmt00_resources[] __initconst = {
+	DEFINE_RES_MEM(0xffca0510, 0x0c),
+	DEFINE_RES_MEM(0xffca0500, 0x04),
+	DEFINE_RES_IRQ(gic_spi(142)), /* CMT0_0 */
+};
+
+#define r8a7791_register_cmt(idx)					\
+	platform_device_register_resndata(&platform_bus, "sh_cmt",	\
+					  idx, cmt##idx##_resources,	\
+					  ARRAY_SIZE(cmt##idx##_resources), \
+					  &cmt##idx##_platform_data,	\
+					  sizeof(struct sh_timer_config))
+
 void __init r8a7791_add_dt_devices(void)
 {
 	r8a7791_register_scif(SCIFA0);
@@ -106,6 +126,14 @@ void __init r8a7791_add_dt_devices(void)
 	r8a7791_register_scif(SCIFA3);
 	r8a7791_register_scif(SCIFA4);
 	r8a7791_register_scif(SCIFA5);
+	r8a7791_register_cmt(00);
+}
+
+void __init r8a7791_init_early(void)
+{
+#ifndef CONFIG_ARM_ARCH_TIMER
+	shmobile_setup_delay(1300, 2, 4); /* Cortex-A15 @ 1300MHz */
+#endif
 }
 
 #ifdef CONFIG_USE_OF
@@ -115,6 +143,7 @@ static const char *r8a7791_boards_compat_dt[] __initdata = {
 };
 
 DT_MACHINE_START(R8A7791_DT, "Generic R8A7791 (Flattened Device Tree)")
+	.init_early	= r8a7791_init_early,
 	.dt_compat	= r8a7791_boards_compat_dt,
 MACHINE_END
 #endif /* CONFIG_USE_OF */