[U-Boot] [PATCH V2 4/6] ARM: keystone2: K2G: Add support for different arm/device speeds

[Nishanth Menon]

From: Lokesh Vutla <lokeshvutla at ti.com>

The maximum device and arm speeds can be determined by reading
EFUSE_BOOTROM register. As there is already a framework for reading this
register, adding support for all possible speeds on k2g devices.

Signed-off-by: Lokesh Vutla <lokeshvutla at ti.com>
Signed-off-by: Nishanth Menon <nm at ti.com>
Reviewed-by: Tom Rini <trini at konsulko.com>
---
Changes in V2:
	- Picked up Reviewed by
V1: https://patchwork.ozlabs.org/patch/588156/

 arch/arm/mach-keystone/clock.c                  |  7 +++-
 arch/arm/mach-keystone/include/mach/clock-k2g.h |  4 +-
 arch/arm/mach-keystone/include/mach/clock.h     |  4 ++
 board/ti/ks2_evm/board_k2g.c                    | 50 +++++++++++++++++++++++--
 4 files changed, 57 insertions(+), 8 deletions(-)

diff --git a/arch/arm/mach-keystone/clock.c b/arch/arm/mach-keystone/clock.c
index 1ae3baf982a1..b25db1e3fede 100644
--- a/arch/arm/mach-keystone/clock.c
+++ b/arch/arm/mach-keystone/clock.c
@@ -238,8 +238,11 @@ static int get_max_speed(u32 val, u32 speed_supported, int *spds)
 			return spds[speed];
 	}
 
-	/* If no bit is set, use SPD800 */
-	return SPD800;
+	/* If no bit is set, return minimum speed */
+	if (cpu_is_k2g())
+		return SPD200;
+	else
+		return SPD800;
 }
 
 static inline u32 read_efuse_bootrom(void)
diff --git a/arch/arm/mach-keystone/include/mach/clock-k2g.h b/arch/arm/mach-keystone/include/mach/clock-k2g.h
index 214c1d3a8360..74de6202fe50 100644
--- a/arch/arm/mach-keystone/include/mach/clock-k2g.h
+++ b/arch/arm/mach-keystone/include/mach/clock-k2g.h
@@ -12,8 +12,8 @@
 
 #define PLLSET_CMD_LIST		"<pa|arm|ddr3>"
 
-#define DEV_SUPPORTED_SPEEDS	0xfff
-#define ARM_SUPPORTED_SPEEDS	0xfff
+#define DEV_SUPPORTED_SPEEDS	0x1ff
+#define ARM_SUPPORTED_SPEEDS	0xff
 
 #define KS2_CLK1_6 sys_clk0_6_clk
 
diff --git a/arch/arm/mach-keystone/include/mach/clock.h b/arch/arm/mach-keystone/include/mach/clock.h
index dfebcb03ea57..72724aa4a912 100644
--- a/arch/arm/mach-keystone/include/mach/clock.h
+++ b/arch/arm/mach-keystone/include/mach/clock.h
@@ -63,8 +63,12 @@
 #define CLOCK_INDEXES_LIST	CLK_LIST(GENERATE_INDX_STR)
 
 enum {
+	SPD200,
+	SPD400,
+	SPD600,
 	SPD800,
 	SPD850,
+	SPD900,
 	SPD1000,
 	SPD1200,
 	SPD1250,
diff --git a/board/ti/ks2_evm/board_k2g.c b/board/ti/ks2_evm/board_k2g.c
index cdeb056a76c4..b62c41225039 100644
--- a/board/ti/ks2_evm/board_k2g.c
+++ b/board/ti/ks2_evm/board_k2g.c
@@ -23,22 +23,64 @@ unsigned int external_clk[ext_clk_count] = {
 	[uart_clk]	=	SYS_CLK,
 };
 
-static struct pll_init_data main_pll_config = {MAIN_PLL, 100, 1, 4};
-static struct pll_init_data tetris_pll_config = {TETRIS_PLL, 100, 1, 4};
+static int arm_speeds[DEVSPEED_NUMSPDS] = {
+	SPD400,
+	SPD600,
+	SPD800,
+	SPD900,
+	SPD1000,
+	SPD900,
+	SPD800,
+	SPD600,
+	SPD400,
+	SPD200,
+};
+
+static int dev_speeds[DEVSPEED_NUMSPDS] = {
+	SPD600,
+	SPD800,
+	SPD900,
+	SPD1000,
+	SPD900,
+	SPD800,
+	SPD600,
+	SPD400,
+};
+
+static struct pll_init_data main_pll_config[NUM_SPDS] = {
+	[SPD400]	= {MAIN_PLL, 100, 3, 2},
+	[SPD600]	= {MAIN_PLL, 300, 6, 2},
+	[SPD800]	= {MAIN_PLL, 200, 3, 2},
+	[SPD900] =	{TETRIS_PLL, 75, 1, 2},
+	[SPD1000] =	{TETRIS_PLL, 250, 3, 2},
+};
+
+static struct pll_init_data tetris_pll_config[NUM_SPDS] = {
+	[SPD200] =	{TETRIS_PLL, 250, 3, 10},
+	[SPD400] =	{TETRIS_PLL, 100, 1, 6},
+	[SPD600] =	{TETRIS_PLL, 100, 1, 4},
+	[SPD800] =	{TETRIS_PLL, 400, 3, 4},
+	[SPD900] =	{TETRIS_PLL, 75, 1, 2},
+	[SPD1000] =	{TETRIS_PLL, 250, 3, 2},
+};
+
 static struct pll_init_data uart_pll_config = {UART_PLL, 64, 1, 4};
 static struct pll_init_data nss_pll_config = {NSS_PLL, 250, 3, 2};
 static struct pll_init_data ddr3_pll_config = {DDR3A_PLL, 250, 3, 10};
 
 struct pll_init_data *get_pll_init_data(int pll)
 {
+	int speed;
 	struct pll_init_data *data = NULL;
 
 	switch (pll) {
 	case MAIN_PLL:
-		data = &main_pll_config;
+		speed = get_max_dev_speed(dev_speeds);
+		data = &main_pll_config[speed];
 		break;
 	case TETRIS_PLL:
-		data = &tetris_pll_config;
+		speed = get_max_arm_speed(arm_speeds);
+		data = &tetris_pll_config[speed];
 		break;
 	case NSS_PLL:
 		data = &nss_pll_config;
-- 
2.7.0