[U-Boot] [PATCH V2 5/5] ARM: OMAP5: srcomp: enable slew rate compensation cells after powerup

R Sricharan
2013-02-04T14:29:24Z

From: Lokesh Vutla <lokeshvutla@ti.com>

After power-up SRCOMP cells are by-passed by default in OMAP5.
Software has to enable these SRCOMP sells.
For ES2: All 5 SRCOMP cells needs to be enabled.
For ES1: Only 4 SRCOMP cells in core power domain are enabled.
The 1 in wkup domain is not enabled because smart i/os
of wkup domain work with default compensation code.

Signed-off-by: R Sricharan <r.sricharan@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
---
arch/arm/cpu/armv7/omap-common/hwinit-common.c | 6 ++
arch/arm/cpu/armv7/omap5/hwinit.c | 116 ++++++++++++++++++++++++
arch/arm/cpu/armv7/omap5/prcm-regs.c | 5 +-
arch/arm/include/asm/arch-omap5/clocks.h | 4 +
arch/arm/include/asm/arch-omap5/omap.h | 19 ++++
arch/arm/include/asm/arch-omap5/sys_proto.h | 1 +
arch/arm/include/asm/omap_common.h | 2 +
7 files changed, 152 insertions(+), 1 deletion(-)

diff --git a/arch/arm/cpu/armv7/omap-common/hwinit-common.c b/arch/arm/cpu/armv7/omap-common/hwinit-common.c
index 2aec2ea..00e246b 100644
--- a/arch/arm/cpu/armv7/omap-common/hwinit-common.c
+++ b/arch/arm/cpu/armv7/omap-common/hwinit-common.c
@@ -35,6 +35,7 @@
#include <asm/cache.h>
#include <asm/system.h>
#include <asm/omap_common.h>
+#include <linux/compiler.h>

#define ARMV7_DCACHE_WRITEBACK 0xe
#define ARMV7_DOMAIN_CLIENT 1
@@ -106,6 +107,10 @@ void spl_display_print(void)
}
#endif

+void __weak srcomp_enable(void)
+{
+}
+
/*
* Routine: s_init
* Description: Does early system init of watchdog, muxing, andclocks
@@ -132,6 +137,7 @@ void s_init(void)
watchdog_init();
set_mux_conf_regs();
#ifdef CONFIG_SPL_BUILD
+ srcomp_enable();
setup_clocks_for_console();

gd = &gdata;
diff --git a/arch/arm/cpu/armv7/omap5/hwinit.c b/arch/arm/cpu/armv7/omap5/hwinit.c
index 0d8c95d..620b99a 100644
--- a/arch/arm/cpu/armv7/omap5/hwinit.c
+++ b/arch/arm/cpu/armv7/omap5/hwinit.c
@@ -32,6 +32,7 @@
#include <asm/armv7.h>
#include <asm/arch/cpu.h>
#include <asm/arch/sys_proto.h>
+#include <asm/arch/clocks.h>
#include <asm/sizes.h>
#include <asm/utils.h>
#include <asm/arch/gpio.h>
@@ -182,6 +183,121 @@ void do_io_settings(void)
writel(EFUSE_3, (*ctrl)->control_efuse_3);
writel(EFUSE_4, (*ctrl)->control_efuse_4);
}
+
+static const struct srcomp_params srcomp_parameters[NUM_SYS_CLKS] = {
+ {0x45, 0x1}, /* 12 MHz */
+ {-1, -1}, /* 13 MHz */
+ {0x63, 0x2}, /* 16.8 MHz */
+ {0x57, 0x2}, /* 19.2 MHz */
+ {0x20, 0x1}, /* 26 MHz */
+ {-1, -1}, /* 27 MHz */
+ {0x41, 0x3} /* 38.4 MHz */
+};
+
+void srcomp_enable(void)
+{
+ u32 srcomp_value, mul_factor, div_factor, clk_val, i;
+ u32 sysclk_ind = get_sys_clk_index();
+ u32 omap_rev = omap_revision();
+
+ mul_factor = srcomp_parameters[sysclk_ind].multiply_factor;
+ div_factor = srcomp_parameters[sysclk_ind].divide_factor;
+
+ for (i = 0; i < 4; i++) {
+ srcomp_value = readl((*ctrl)->control_srcomp_north_side + i*4);
+ srcomp_value &=
+ ~(MULTIPLY_FACTOR_XS_MASK | DIVIDE_FACTOR_XS_MASK);
+ srcomp_value |= (mul_factor << MULTIPLY_FACTOR_XS_SHIFT) |
+ (div_factor << DIVIDE_FACTOR_XS_SHIFT);
+ writel(srcomp_value, (*ctrl)->control_srcomp_north_side + i*4);
+ }
+
+ if ((omap_rev == OMAP5430_ES1_0) || (omap_rev == OMAP5432_ES1_0)) {
+ clk_val = readl((*prcm)->cm_coreaon_io_srcomp_clkctrl);
+ clk_val |= OPTFCLKEN_SRCOMP_FCLK_MASK;
+ writel(clk_val, (*prcm)->cm_coreaon_io_srcomp_clkctrl);
+
+ for (i = 0; i < 4; i++) {
+ srcomp_value =
+ readl((*ctrl)->control_srcomp_north_side + i*4);
+ srcomp_value &= ~PWRDWN_XS_MASK;
+ writel(srcomp_value,
+ (*ctrl)->control_srcomp_north_side + i*4);
+
+ while (((readl((*ctrl)->control_srcomp_north_side + i*4)
+ & SRCODE_READ_XS_MASK) >>
+ SRCODE_READ_XS_SHIFT) == 0)
+ ;
+
+ srcomp_value =
+ readl((*ctrl)->control_srcomp_north_side + i*4);
+ srcomp_value &= ~OVERRIDE_XS_MASK;
+ writel(srcomp_value,
+ (*ctrl)->control_srcomp_north_side + i*4);
+ }
+ } else {
+ srcomp_value = readl((*ctrl)->control_srcomp_east_side_wkup);
+ srcomp_value &= ~(MULTIPLY_FACTOR_XS_MASK |
+ DIVIDE_FACTOR_XS_MASK);
+ srcomp_value |= (mul_factor << MULTIPLY_FACTOR_XS_SHIFT) |
+ (div_factor << DIVIDE_FACTOR_XS_SHIFT);
+ writel(srcomp_value, (*ctrl)->control_srcomp_east_side_wkup);
+
+ for (i = 0; i < 4; i++) {
+ srcomp_value =
+ readl((*ctrl)->control_srcomp_north_side + i*4);
+ srcomp_value |= SRCODE_OVERRIDE_SEL_XS_MASK;
+ writel(srcomp_value,
+ (*ctrl)->control_srcomp_north_side + i*4);
+
+ srcomp_value =
+ readl((*ctrl)->control_srcomp_north_side + i*4);
+ srcomp_value &= ~OVERRIDE_XS_MASK;
+ writel(srcomp_value,
+ (*ctrl)->control_srcomp_north_side + i*4);
+ }
+
+ srcomp_value =
+ readl((*ctrl)->control_srcomp_east_side_wkup);
+ srcomp_value |= SRCODE_OVERRIDE_SEL_XS_MASK;
+ writel(srcomp_value, (*ctrl)->control_srcomp_east_side_wkup);
+
+ srcomp_value =
+ readl((*ctrl)->control_srcomp_east_side_wkup);
+ srcomp_value &= ~OVERRIDE_XS_MASK;
+ writel(srcomp_value, (*ctrl)->control_srcomp_east_side_wkup);
+
+ clk_val = readl((*prcm)->cm_coreaon_io_srcomp_clkctrl);
+ clk_val |= OPTFCLKEN_SRCOMP_FCLK_MASK;
+ writel(clk_val, (*prcm)->cm_coreaon_io_srcomp_clkctrl);
+
+ clk_val = readl((*prcm)->cm_wkupaon_io_srcomp_clkctrl);
+ clk_val |= OPTFCLKEN_SRCOMP_FCLK_MASK;
+ writel(clk_val, (*prcm)->cm_wkupaon_io_srcomp_clkctrl);
+
+ for (i = 0; i < 4; i++) {
+ while (((readl((*ctrl)->control_srcomp_north_side + i*4)
+ & SRCODE_READ_XS_MASK) >>
+ SRCODE_READ_XS_SHIFT) == 0)
+ ;
+
+ srcomp_value =
+ readl((*ctrl)->control_srcomp_north_side + i*4);
+ srcomp_value &= ~SRCODE_OVERRIDE_SEL_XS_MASK;
+ writel(srcomp_value,
+ (*ctrl)->control_srcomp_north_side + i*4);
+ }
+
+ while (((readl((*ctrl)->control_srcomp_east_side_wkup) &
+ SRCODE_READ_XS_MASK) >> SRCODE_READ_XS_SHIFT) == 0)
+ ;
+
+ srcomp_value =
+ readl((*ctrl)->control_srcomp_east_side_wkup);
+ srcomp_value &= ~SRCODE_OVERRIDE_SEL_XS_MASK;
+ writel(srcomp_value, (*ctrl)->control_srcomp_east_side_wkup);
+ }
+}
#endif

void config_data_eye_leveling_samples(u32 emif_base)
diff --git a/arch/arm/cpu/armv7/omap5/prcm-regs.c b/arch/arm/cpu/armv7/omap5/prcm-regs.c
index 58c9d50..5e5abcc 100644
--- a/arch/arm/cpu/armv7/omap5/prcm-regs.c
+++ b/arch/arm/cpu/armv7/omap5/prcm-regs.c
@@ -149,6 +149,7 @@ struct prcm_regs const omap5_es1_prcm = {

/* cm2.core */
.cm_coreaon_bandgap_clkctrl = 0x4a008648,
+ .cm_coreaon_io_srcomp_clkctrl = 0x4a008650,
.cm_l3_1_clkstctrl = 0x4a008700,
.cm_l3_1_dynamicdep = 0x4a008708,
.cm_l3_1_l3_1_clkctrl = 0x4a008720,
@@ -294,6 +295,7 @@ struct prcm_regs const omap5_es1_prcm = {
.cm_wkup_rtc_clkctrl = 0x4ae07880,
.cm_wkup_bandgap_clkctrl = 0x4ae07888,
.cm_wkupaon_scrm_clkctrl = 0x4ae07890,
+ .cm_wkupaon_io_srcomp_clkctrl = 0x4ae07898,
.prm_vc_val_bypass = 0x4ae07ba0,
.prm_vc_cfg_i2c_mode = 0x4ae07bb4,
.prm_vc_cfg_i2c_clk = 0x4ae07bb8,
@@ -502,7 +504,7 @@ struct prcm_regs const omap5_es2_prcm = {
.cm_ssc_deltamstep_dpll_unipro = 0x4a0081e8,
.cm_ssc_modfreqdiv_dpll_unipro = 0x4a0081ec,
.cm_coreaon_bandgap_clkctrl = 0x4a008648,
-
+ .cm_coreaon_io_srcomp_clkctrl = 0x4a008650,

/* cm2.core */
.cm_l3_1_clkstctrl = 0x4a008700,
@@ -650,6 +652,7 @@ struct prcm_regs const omap5_es2_prcm = {
.cm_wkup_rtc_clkctrl = 0x4ae07980,
.cm_wkup_bandgap_clkctrl = 0x4ae07988,
.cm_wkupaon_scrm_clkctrl = 0x4ae07990,
+ .cm_wkupaon_io_srcomp_clkctrl = 0x4ae07998,
.prm_vc_val_bypass = 0x4ae07ca0,
.prm_vc_cfg_i2c_mode = 0x4ae07cb4,
.prm_vc_cfg_i2c_clk = 0x4ae07cb8,
diff --git a/arch/arm/include/asm/arch-omap5/clocks.h b/arch/arm/include/asm/arch-omap5/clocks.h
index 685aad5..6f64186 100644
--- a/arch/arm/include/asm/arch-omap5/clocks.h
+++ b/arch/arm/include/asm/arch-omap5/clocks.h
@@ -186,6 +186,10 @@
#define OPTFCLKEN_SCRM_CORE_SHIFT 8
#define OPTFCLKEN_SCRM_CORE_MASK (1 << 8)

+/* CM_COREAON_IO_SRCOMP_CLKCTRL */
+#define OPTFCLKEN_SRCOMP_FCLK_SHIFT 8
+#define OPTFCLKEN_SRCOMP_FCLK_MASK (1 << 8)
+
/* Clock frequencies */
#define OMAP_SYS_CLK_FREQ_38_4_MHZ 38400000
#define OMAP_SYS_CLK_IND_38_4_MHZ 6
diff --git a/arch/arm/include/asm/arch-omap5/omap.h b/arch/arm/include/asm/arch-omap5/omap.h
index ba2775b..d29be93 100644
--- a/arch/arm/include/asm/arch-omap5/omap.h
+++ b/arch/arm/include/asm/arch-omap5/omap.h
@@ -229,7 +229,26 @@ struct s32ktimer {
#define CH_FLAGS_CHFLASH (0x1 << 2)
#define CH_FLAGS_CHMMCSD (0x1 << 3)

+/* CONTROL_SRCOMP_XXX_SIDE */
+#define OVERRIDE_XS_SHIFT 30
+#define OVERRIDE_XS_MASK (1 << 30)
+#define SRCODE_READ_XS_SHIFT 12
+#define SRCODE_READ_XS_MASK (0xff << 12)
+#define PWRDWN_XS_SHIFT 11
+#define PWRDWN_XS_MASK (1 << 11)
+#define DIVIDE_FACTOR_XS_SHIFT 4
+#define DIVIDE_FACTOR_XS_MASK (0x7f << 4)
+#define MULTIPLY_FACTOR_XS_SHIFT 1
+#define MULTIPLY_FACTOR_XS_MASK (0x7 << 1)
+#define SRCODE_OVERRIDE_SEL_XS_SHIFT 0
+#define SRCODE_OVERRIDE_SEL_XS_MASK (1 << 0)
+
#ifndef __ASSEMBLY__
+struct srcomp_params {
+ s8 divide_factor;
+ s8 multiply_factor;
+};
+
struct omap_boot_parameters {
char *boot_message;
unsigned int mem_boot_descriptor;
diff --git a/arch/arm/include/asm/arch-omap5/sys_proto.h b/arch/arm/include/asm/arch-omap5/sys_proto.h
index 201ed6f..b8d841d 100644
--- a/arch/arm/include/asm/arch-omap5/sys_proto.h
+++ b/arch/arm/include/asm/arch-omap5/sys_proto.h
@@ -59,6 +59,7 @@ int omap_vc_bypass_send_value(u8 sa, u8 reg_addr, u8 reg_data);
u32 warm_reset(void);
void force_emif_self_refresh(void);
void get_ioregs(const struct ctrl_ioregs **regs);
+void srcomp_enable(void);

/*
* This is used to verify if the configuration header
diff --git a/arch/arm/include/asm/omap_common.h b/arch/arm/include/asm/omap_common.h
index 8a886ec..0af0c33 100644
--- a/arch/arm/include/asm/omap_common.h
+++ b/arch/arm/include/asm/omap_common.h
@@ -153,6 +153,7 @@ struct prcm_regs {

/* cm2.core */
u32 cm_coreaon_bandgap_clkctrl;
+ u32 cm_coreaon_io_srcomp_clkctrl;
u32 cm_l3_1_clkstctrl;
u32 cm_l3_1_dynamicdep;
u32 cm_l3_1_l3_1_clkctrl;
@@ -300,6 +301,7 @@ struct prcm_regs {
u32 cm_wkup_rtc_clkctrl;
u32 cm_wkup_bandgap_clkctrl;
u32 cm_wkupaon_scrm_clkctrl;
+ u32 cm_wkupaon_io_srcomp_clkctrl;
u32 prm_vc_val_bypass;
u32 prm_vc_cfg_i2c_mode;
u32 prm_vc_cfg_i2c_clk;
--
1.7.9.5