davinci: split out some dm644x-specific bits from psc
Split out DaVinci DM6446-specific bits from more generic bits:
- Add a CONFIG_SOC_DM644X. All current boards use DM6446 chips;
DM6443 and DM6441 chips differ in available peripherals.
- Move most DM644X-specific bits from psc.c to a new dm644x.c file,
which is conditionally built. It provides device-specific setup.
Plus minor coding style and comment updates with respect to the PSC.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
diff --git a/cpu/arm926ejs/davinci/psc.c b/cpu/arm926ejs/davinci/psc.c
index 28e2a4b..5bb972f 100644
--- a/cpu/arm926ejs/davinci/psc.c
+++ b/cpu/arm926ejs/davinci/psc.c
@@ -26,22 +26,22 @@
#include <common.h>
#include <asm/arch/hardware.h>
-#define PINMUX0_EMACEN (1 << 31)
-#define PINMUX0_AECS5 (1 << 11)
-#define PINMUX0_AECS4 (1 << 10)
-
-#define PINMUX1_I2C (1 << 7)
-#define PINMUX1_UART1 (1 << 1)
-#define PINMUX1_UART0 (1 << 0)
-
/*
- * The DM6446 includes two separate power domains: "Always On" and "DSP". The
- * "Always On" power domain is always on when the chip is on. The "Always On"
- * domain is powered by the VDD pins of the DM6446. The majority of the
- * DM6446's modules lie within the "Always On" power domain. A separate
- * domain called the "DSP" domain houses the C64x+ and VICP. The "DSP" domain
- * is not always on. The "DSP" power domain is powered by the CVDDDSP pins of
- * the DM6446.
+ * The PSC manages three inputs to a "module" which may be a peripheral or
+ * CPU. Those inputs are the module's: clock; reset signal; and sometimes
+ * its power domain. For our purposes, we only care whether clock and power
+ * are active, and the module is out of reset.
+ *
+ * DaVinci chips may include two separate power domains: "Always On" and "DSP".
+ * Chips without a DSP generally have only one domain.
+ *
+ * The "Always On" power domain is always on when the chip is on, and is
+ * powered by the VDD pins (on DM644X). The majority of DaVinci modules
+ * lie within the "Always On" power domain.
+ *
+ * A separate domain called the "DSP" domain houses the C64x+ and other video
+ * hardware such as VICP. In some chips, the "DSP" domain is not always on.
+ * The "DSP" power domain is powered by the CVDDDSP pins (on DM644X).
*/
/* Works on Always On power domain only (no PD argument) */
@@ -55,15 +55,17 @@
mdstat = REG_P(PSC_MDSTAT_BASE + (id * 4));
mdctl = REG_P(PSC_MDCTL_BASE + (id * 4));
- while (REG(PSC_PTSTAT) & 0x01);
+ while (REG(PSC_PTSTAT) & 0x01)
+ continue;
if ((*mdstat & 0x1f) == 0x03)
return; /* Already on and enabled */
*mdctl |= 0x03;
- /* Special treatment for some modules as for sprue14 p.7.4.2 */
switch (id) {
+#ifdef CONFIG_SOC_DM644X
+ /* Special treatment for some modules as for sprue14 p.7.4.2 */
case DAVINCI_LPSC_VPSSSLV:
case DAVINCI_LPSC_EMAC:
case DAVINCI_LPSC_EMAC_WRAPPER:
@@ -80,14 +82,20 @@
case DAVINCI_LPSC_GPIO:
*mdctl |= 0x200;
break;
+#endif
}
REG(PSC_PTCMD) = 0x01;
- while (REG(PSC_PTSTAT) & 0x03);
- while ((*mdstat & 0x1f) != 0x03); /* Probably an overkill... */
+ while (REG(PSC_PTSTAT) & 0x03)
+ continue;
+ while ((*mdstat & 0x1f) != 0x03) /* Probably an overkill... */
+ continue;
}
+/* Not all DaVinci chips have a DSP power domain. */
+#ifdef CONFIG_SOC_DM644X
+
/* If DSPLINK is used, we don't want U-Boot to power on the DSP. */
#if !defined(CONFIG_SYS_USE_DSPLINK)
void dsp_on(void)
@@ -124,59 +132,4 @@
}
#endif /* CONFIG_SYS_USE_DSPLINK */
-void davinci_enable_uart0(void)
-{
- lpsc_on(DAVINCI_LPSC_UART0);
-
- /* Bringup UART0 out of reset */
- REG(UART0_PWREMU_MGMT) = 0x0000e003;
-
- /* Enable UART0 MUX lines */
- REG(PINMUX1) |= PINMUX1_UART0;
-}
-
-#ifdef CONFIG_DRIVER_TI_EMAC
-void davinci_enable_emac(void)
-{
- lpsc_on(DAVINCI_LPSC_EMAC);
- lpsc_on(DAVINCI_LPSC_EMAC_WRAPPER);
- lpsc_on(DAVINCI_LPSC_MDIO);
-
- /* Enable GIO3.3V cells used for EMAC */
- REG(VDD3P3V_PWDN) = 0;
-
- /* Enable EMAC. */
- REG(PINMUX0) |= PINMUX0_EMACEN;
-}
-#endif
-
-void davinci_enable_i2c(void)
-{
- lpsc_on(DAVINCI_LPSC_I2C);
-
- /* Enable I2C pin Mux */
- REG(PINMUX1) |= PINMUX1_I2C;
-}
-
-void davinci_errata_workarounds(void)
-{
- /*
- * Workaround for TMS320DM6446 errata 1.3.22:
- * PSC: PTSTAT Register Does Not Clear After Warm/Maximum Reset
- * Revision(s) Affected: 1.3 and earlier
- */
- REG(PSC_SILVER_BULLET) = 0;
-
- /*
- * Set the PR_OLD_COUNT bits in the Bus Burst Priority Register (PBBPR)
- * as suggested in TMS320DM6446 errata 2.1.2:
- *
- * On DM6446 Silicon Revision 2.1 and earlier, under certain conditions
- * low priority modules can occupy the bus and prevent high priority
- * modules like the VPSS from getting the required DDR2 throughput.
- * A hex value of 0x20 should provide a good ARM (cache enabled)
- * performance and still allow good utilization by the VPSS or other
- * modules.
- */
- REG(VBPR) = 0x20;
-}
+#endif /* have a DSP */