summaryrefslogtreecommitdiff
path: root/arch/arm
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/cpu/armv7/omap5/dra7xx_iodelay.c101
-rw-r--r--arch/arm/include/asm/arch-omap5/dra7xx_iodelay.h27
-rw-r--r--arch/arm/include/asm/arch-omap5/mux_dra7xx.h2
-rw-r--r--arch/arm/include/asm/arch-omap5/sys_proto.h12
4 files changed, 140 insertions, 2 deletions
diff --git a/arch/arm/cpu/armv7/omap5/dra7xx_iodelay.c b/arch/arm/cpu/armv7/omap5/dra7xx_iodelay.c
index 4b8ba26..9fa6e69 100644
--- a/arch/arm/cpu/armv7/omap5/dra7xx_iodelay.c
+++ b/arch/arm/cpu/armv7/omap5/dra7xx_iodelay.c
@@ -13,6 +13,7 @@
#include <asm/arch/omap.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/clock.h>
+#include <asm/arch/mux_dra7xx.h>
#include <asm/omap_common.h>
static int isolate_io(u32 isolate)
@@ -80,7 +81,94 @@ static int update_delay_mechanism(u32 base)
return 0;
}
-void __recalibrate_iodelay(struct pad_conf_entry const *pad, int npads)
+static u32 calculate_delay(u32 base, u16 offset, u16 den)
+{
+ u16 refclk_period, dly_cnt, ref_cnt;
+ u32 reg, q, r;
+
+ refclk_period = readl(base + CFG_REG_2_OFFSET) &
+ CFG_REG_REFCLK_PERIOD_MASK;
+
+ reg = readl(base + offset);
+ dly_cnt = (reg & CFG_REG_DLY_CNT_MASK) >> CFG_REG_DLY_CNT_SHIFT;
+ ref_cnt = (reg & CFG_REG_REF_CNT_MASK) >> CFG_REG_REF_CNT_SHIFT;
+
+ if (!dly_cnt || !den)
+ return 0;
+
+ /*
+ * To avoid overflow and integer truncation, delay value
+ * is calculated as quotient + remainder.
+ */
+ q = 5 * ((ref_cnt * refclk_period) / (dly_cnt * den));
+ r = (10 * ((ref_cnt * refclk_period) % (dly_cnt * den))) /
+ (2 * dly_cnt * den);
+
+ return q + r;
+}
+
+static u32 get_cfg_reg(u16 a_delay, u16 g_delay, u32 cpde, u32 fpde)
+{
+ u32 g_delay_coarse, g_delay_fine;
+ u32 a_delay_coarse, a_delay_fine;
+ u32 c_elements, f_elements;
+ u32 total_delay, reg = 0;
+
+ g_delay_coarse = g_delay / 920;
+ g_delay_fine = ((g_delay % 920) * 10) / 60;
+
+ a_delay_coarse = a_delay / cpde;
+ a_delay_fine = ((a_delay % cpde) * 10) / fpde;
+
+ c_elements = g_delay_coarse + a_delay_coarse;
+ f_elements = (g_delay_fine + a_delay_fine) / 10;
+
+ if (f_elements > 22) {
+ total_delay = c_elements * cpde + f_elements * fpde;
+
+ c_elements = total_delay / cpde;
+ f_elements = (total_delay % cpde) / fpde;
+ }
+
+ reg = (c_elements << CFG_X_COARSE_DLY_SHIFT) & CFG_X_COARSE_DLY_MASK;
+ reg |= (f_elements << CFG_X_FINE_DLY_SHIFT) & CFG_X_FINE_DLY_MASK;
+ reg |= CFG_X_SIGNATURE << CFG_X_SIGNATURE_SHIFT;
+ reg |= CFG_X_LOCK << CFG_X_LOCK_SHIFT;
+
+ return reg;
+}
+
+static int do_set_iodelay(u32 base, struct iodelay_cfg_entry const *array,
+ int niodelays)
+{
+ struct iodelay_cfg_entry *iodelay = (struct iodelay_cfg_entry *)array;
+ u32 reg, cpde, fpde, i;
+
+ if (!niodelays)
+ return 0;
+
+ cpde = calculate_delay((*ctrl)->iodelay_config_base, CFG_REG_3_OFFSET,
+ 88);
+ if (!cpde)
+ return ERR_CPDE;
+
+ fpde = calculate_delay((*ctrl)->iodelay_config_base, CFG_REG_4_OFFSET,
+ 264);
+ if (!fpde)
+ return ERR_FPDE;
+
+ for (i = 0; i < niodelays; i++, iodelay++) {
+ reg = get_cfg_reg(iodelay->a_delay, iodelay->g_delay, cpde,
+ fpde);
+ writel(reg, base + iodelay->offset);
+ }
+
+ return 0;
+}
+
+void __recalibrate_iodelay(struct pad_conf_entry const *pad, int npads,
+ struct iodelay_cfg_entry const *iodelay,
+ int niodelays)
{
int ret = 0;
@@ -109,6 +197,11 @@ void __recalibrate_iodelay(struct pad_conf_entry const *pad, int npads)
/* Configure Mux settings */
do_set_mux32((*ctrl)->control_padconf_core_base, pad, npads);
+ /* Configure Manual IO timing modes */
+ ret = do_set_iodelay((*ctrl)->iodelay_config_base, iodelay, niodelays);
+ if (ret)
+ goto err;
+
ret = isolate_io(DEISOLATE_IO);
err:
@@ -133,6 +226,12 @@ err:
case ERR_DEISOLATE_IO:
puts("IODELAY: De-isolation of Device IOs failed\n");
break;
+ case ERR_CPDE:
+ puts("IODELAY: CPDE calculation failed\n");
+ break;
+ case ERR_FPDE:
+ puts("IODELAY: FPDE calculation failed\n");
+ break;
default:
debug("IODELAY: IO delay recalibration successfully completed\n");
}
diff --git a/arch/arm/include/asm/arch-omap5/dra7xx_iodelay.h b/arch/arm/include/asm/arch-omap5/dra7xx_iodelay.h
index a924629..2f53d85 100644
--- a/arch/arm/include/asm/arch-omap5/dra7xx_iodelay.h
+++ b/arch/arm/include/asm/arch-omap5/dra7xx_iodelay.h
@@ -35,6 +35,14 @@
#define CFG_IODELAY_UNLOCK_KEY 0x0000AAAA
#define CFG_IODELAY_LOCK_KEY 0x0000AAAB
+/* CONFIG_REG_3/4 */
+#define CFG_REG_3_OFFSET 0x18
+#define CFG_REG_4_OFFSET 0x1C
+#define CFG_REG_DLY_CNT_SHIFT 16
+#define CFG_REG_DLY_CNT_MASK (0xFFFF << 16)
+#define CFG_REG_REF_CNT_SHIFT 0
+#define CFG_REG_REF_CNT_MASK (0xFFFF << 0)
+
/* CTRL_CORE_SMA_SW_0 */
#define CTRL_ISOLATE_SHIFT 2
#define CTRL_ISOLATE_MASK (1 << 2)
@@ -53,6 +61,23 @@
#define ERR_DEISOLATE_IO 0x2
#define ERR_ISOLATE_IO 0x4
#define ERR_UPDATE_DELAY 0x8
+#define ERR_CPDE 0x3
+#define ERR_FPDE 0x5
+
+/* CFG_XXX */
+#define CFG_X_SIGNATURE_SHIFT 12
+#define CFG_X_SIGNATURE_MASK (0x3F << 12)
+#define CFG_X_LOCK_SHIFT 10
+#define CFG_X_LOCK_MASK (0x1 << 10)
+#define CFG_X_COARSE_DLY_SHIFT 5
+#define CFG_X_COARSE_DLY_MASK (0x1F << 5)
+#define CFG_X_FINE_DLY_SHIFT 0
+#define CFG_X_FINE_DLY_MASK (0x1F << 0)
+#define CFG_X_SIGNATURE 0x29
+#define CFG_X_LOCK 1
+
+void __recalibrate_iodelay(struct pad_conf_entry const *pad, int npads,
+ struct iodelay_cfg_entry const *iodelay,
+ int niodelays);
-void __recalibrate_iodelay(struct pad_conf_entry const *array, int npads);
#endif
diff --git a/arch/arm/include/asm/arch-omap5/mux_dra7xx.h b/arch/arm/include/asm/arch-omap5/mux_dra7xx.h
index 13c288b..2115abb 100644
--- a/arch/arm/include/asm/arch-omap5/mux_dra7xx.h
+++ b/arch/arm/include/asm/arch-omap5/mux_dra7xx.h
@@ -61,6 +61,8 @@
#define MODE_SELECT (1 << 8)
#define DELAYMODE_SHIFT 4
+#define MANUAL_MODE MODE_SELECT
+
#define VIRTUAL_MODE0 (MODE_SELECT | (0x0 << DELAYMODE_SHIFT))
#define VIRTUAL_MODE1 (MODE_SELECT | (0x1 << DELAYMODE_SHIFT))
#define VIRTUAL_MODE2 (MODE_SELECT | (0x2 << DELAYMODE_SHIFT))
diff --git a/arch/arm/include/asm/arch-omap5/sys_proto.h b/arch/arm/include/asm/arch-omap5/sys_proto.h
index b41bf15..6da8297 100644
--- a/arch/arm/include/asm/arch-omap5/sys_proto.h
+++ b/arch/arm/include/asm/arch-omap5/sys_proto.h
@@ -18,6 +18,18 @@
DECLARE_GLOBAL_DATA_PTR;
+/*
+ * Structure for Iodelay configuration registers.
+ * Theoretical max for g_delay is 21560 ps.
+ * Theoretical max for a_delay is 1/3rd of g_delay max.
+ * So using u16 for both a/g_delay.
+ */
+struct iodelay_cfg_entry {
+ u16 offset;
+ u16 a_delay;
+ u16 g_delay;
+};
+
struct pad_conf_entry {
u32 offset;
u32 val;
generated by cgit v1.1 at 2024-11-09 07:29:21 +0000