[U-Boot] [PATCH v6 03/10] mips: ath79: add support for AR933x SOCs

Wills Wang
2016-01-04T11:14:54Z

This patch enable work for ar933x SOC.

Signed-off-by: Wills Wang <wills.wang@live.com>
---

Changes in v6:
- Remove board.c
- Define magic value in ddr.c

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

arch/mips/mach-ath79/Kconfig | 10 +
arch/mips/mach-ath79/Makefile | 2 +
arch/mips/mach-ath79/ar933x/Makefile | 7 +
arch/mips/mach-ath79/ar933x/clk.c | 90 ++++++++
arch/mips/mach-ath79/ar933x/ddr.c | 317 ++++++++++++++++++++++++++++
arch/mips/mach-ath79/ar933x/lowlevel_init.S | 280 ++++++++++++++++++++++++
6 files changed, 706 insertions(+)
create mode 100644 arch/mips/mach-ath79/ar933x/Makefile
create mode 100644 arch/mips/mach-ath79/ar933x/clk.c
create mode 100644 arch/mips/mach-ath79/ar933x/ddr.c
create mode 100644 arch/mips/mach-ath79/ar933x/lowlevel_init.S

diff --git a/arch/mips/mach-ath79/Kconfig b/arch/mips/mach-ath79/Kconfig
index df84876..ff2c491 100644
--- a/arch/mips/mach-ath79/Kconfig
+++ b/arch/mips/mach-ath79/Kconfig
@@ -7,4 +7,14 @@ config SYS_VENDOR
config SYS_SOC
default "ath79"

+config SOC_AR933X
+ bool
+ select SUPPORTS_BIG_ENDIAN
+ select SUPPORTS_CPU_MIPS32_R1
+ select SUPPORTS_CPU_MIPS32_R2
+ select SYS_MIPS_CACHE_INIT_RAM_LOAD
+ select MIPS_TUNE_24KC
+ help
+ This supports QCA/Atheros ar933x family SOCs.
+
endmenu
diff --git a/arch/mips/mach-ath79/Makefile b/arch/mips/mach-ath79/Makefile
index 6203cf0..9b9447e 100644
--- a/arch/mips/mach-ath79/Makefile
+++ b/arch/mips/mach-ath79/Makefile
@@ -5,3 +5,5 @@
obj-y += reset.o
obj-y += cpu.o
obj-y += dram.o
+
+obj-$(CONFIG_SOC_AR933X) += ar933x/
\ No newline at end of file
diff --git a/arch/mips/mach-ath79/ar933x/Makefile b/arch/mips/mach-ath79/ar933x/Makefile
new file mode 100644
index 0000000..fd74f0c
--- /dev/null
+++ b/arch/mips/mach-ath79/ar933x/Makefile
@@ -0,0 +1,7 @@
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+obj-y += clk.o
+obj-y += ddr.o
+obj-y += lowlevel_init.o
diff --git a/arch/mips/mach-ath79/ar933x/clk.c b/arch/mips/mach-ath79/ar933x/clk.c
new file mode 100644
index 0000000..ae7ccbc
--- /dev/null
+++ b/arch/mips/mach-ath79/ar933x/clk.c
@@ -0,0 +1,90 @@
+/*
+ * (C) Copyright 2015
+ * Wills Wang, <wills.wang@live.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/addrspace.h>
+#include <asm/types.h>
+#include <mach/ar71xx_regs.h>
+#include <mach/reset.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static u32 ar933x_get_xtal(void)
+{
+ u32 val;
+
+ val = get_bootstrap();
+ if (val & AR933X_BOOTSTRAP_REF_CLK_40)
+ return 40000000;
+ else
+ return 25000000;
+}
+
+int get_serial_clock(void)
+{
+ return ar933x_get_xtal();
+}
+
+int get_clocks(void)
+{
+ void __iomem *regs;
+ u32 val, xtal, pll, div;
+
+ regs = map_physmem(AR71XX_PLL_BASE, AR71XX_PLL_SIZE,
+ MAP_NOCACHE);
+ xtal = ar933x_get_xtal();
+ val = readl(regs + AR933X_PLL_CPU_CONFIG_REG);
+
+ /* VCOOUT = XTAL * DIV_INT */
+ div = (val >> AR933X_PLL_CPU_CONFIG_REFDIV_SHIFT)
+ & AR933X_PLL_CPU_CONFIG_REFDIV_MASK;
+ pll = xtal / div;
+
+ /* PLLOUT = VCOOUT * (1/2^OUTDIV) */
+ div = (val >> AR933X_PLL_CPU_CONFIG_NINT_SHIFT)
+ & AR933X_PLL_CPU_CONFIG_NINT_MASK;
+ pll *= div;
+ div = (val >> AR933X_PLL_CPU_CONFIG_OUTDIV_SHIFT)
+ & AR933X_PLL_CPU_CONFIG_OUTDIV_MASK;
+ if (!div)
+ div = 1;
+ pll >>= div;
+
+ val = readl(regs + AR933X_PLL_CLK_CTRL_REG);
+
+ /* CPU_CLK = PLLOUT / CPU_POST_DIV */
+ div = ((val >> AR933X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT)
+ & AR933X_PLL_CLK_CTRL_CPU_POST_DIV_MASK) + 1;
+ gd->cpu_clk = pll / div;
+
+ /* DDR_CLK = PLLOUT / DDR_POST_DIV */
+ div = ((val >> AR933X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT)
+ & AR933X_PLL_CLK_CTRL_DDR_POST_DIV_MASK) + 1;
+ gd->mem_clk = pll / div;
+
+ /* AHB_CLK = PLLOUT / AHB_POST_DIV */
+ div = ((val >> AR933X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT)
+ & AR933X_PLL_CLK_CTRL_AHB_POST_DIV_MASK) + 1;
+ gd->bus_clk = pll / div;
+
+ return 0;
+}
+
+ulong get_bus_freq(ulong dummy)
+{
+ if (!gd->bus_clk)
+ get_clocks();
+ return gd->bus_clk;
+}
+
+ulong get_ddr_freq(ulong dummy)
+{
+ if (!gd->mem_clk)
+ get_clocks();
+ return gd->mem_clk;
+}
diff --git a/arch/mips/mach-ath79/ar933x/ddr.c b/arch/mips/mach-ath79/ar933x/ddr.c
new file mode 100644
index 0000000..675d922
--- /dev/null
+++ b/arch/mips/mach-ath79/ar933x/ddr.c
@@ -0,0 +1,317 @@
+/*
+ * (C) Copyright 2015
+ * Wills Wang, <wills.wang@live.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/addrspace.h>
+#include <asm/types.h>
+#include <mach/ar71xx_regs.h>
+#include <mach/reset.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define DDR_CTRL_UPD_EMR3S BIT(5)
+#define DDR_CTRL_UPD_EMR2S BIT(4)
+#define DDR_CTRL_PRECHARGE BIT(3)
+#define DDR_CTRL_AUTO_REFRESH BIT(2)
+#define DDR_CTRL_UPD_EMRS BIT(1)
+#define DDR_CTRL_UPD_MRS BIT(0)
+
+#define DDR_REFRESH_EN (1 << 14)
+#define DDR_REFRESH_M 0x3ff
+#define DDR_REFRESH(x) ((x) & 0x3ff)
+#define DDR_REFRESH_VAL_25M (DDR_REFRESH_EN | DDR_REFRESH(390))
+#define DDR_REFRESH_VAL_40M (DDR_REFRESH_EN | DDR_REFRESH(624))
+
+#define DDR_TRAS_S 0
+#define DDR_TRAS_M 0x1f
+#define DDR_TRAS(x) ((x) << DDR_TRAS_S)
+#define DDR_TRCD_M 0xf
+#define DDR_TRCD_S 5
+#define DDR_TRCD(x) ((x) << DDR_TRCD_S)
+#define DDR_TRP_M 0xf
+#define DDR_TRP_S 9
+#define DDR_TRP(x) ((x) << DDR_TRP_S)
+#define DDR_TRRD_M 0xf
+#define DDR_TRRD_S 13
+#define DDR_TRRD(x) ((x) << DDR_TRRD_S)
+#define DDR_TRFC_M 0x7f
+#define DDR_TRFC_S 17
+#define DDR_TRFC(x) ((x) << DDR_TRFC_S)
+#define DDR_TMRD_M 0xf
+#define DDR_TMRD_S 23
+#define DDR_TMRD(x) ((x) << DDR_TMRD_S)
+#define DDR_CAS_L_M 0x17
+#define DDR_CAS_L_S 27
+#define DDR_CAS_L(x) (((x) & DDR_CAS_L_M) << DDR_CAS_L_S)
+#define DDR_OPEN (1 << 30)
+#define DDR_CONF_REG_VAL (DDR_TRAS(16) | DDR_TRCD(6) | \
+ DDR_TRP(6) | DDR_TRRD(4) | \
+ DDR_TRFC(30) | DDR_TMRD(15) | \
+ DDR_CAS_L(7) | DDR_OPEN)
+
+#define DDR_BURST_LEN_S 0
+#define DDR_BURST_LEN_M 0xf
+#define DDR_BURST_LEN(x) ((x) << DDR_BURST_LEN_S)
+#define DDR_BURST_TYPE (1 << 4)
+#define DDR_CNTL_OE_EN (1 << 5)
+#define DDR_PHASE_SEL (1 << 6)
+#define DDR_CKE (1 << 7)
+#define DDR_TWR_S 8
+#define DDR_TWR_M 0xf
+#define DDR_TWR(x) ((x) << DDR_TWR_S)
+#define DDR_TRTW_S 12
+#define DDR_TRTW_M 0x1f
+#define DDR_TRTW(x) ((x) << DDR_TRTW_S)
+#define DDR_TRTP_S 17
+#define DDR_TRTP_M 0xf
+#define DDR_TRTP(x) ((x) << DDR_TRTP_S)
+#define DDR_TWTR_S 21
+#define DDR_TWTR_M 0x1f
+#define DDR_TWTR(x) ((x) << DDR_TWTR_S)
+#define DDR_G_OPEN_L_S 26
+#define DDR_G_OPEN_L_M 0xf
+#define DDR_G_OPEN_L(x) ((x) << DDR_G_OPEN_L_S)
+#define DDR_HALF_WIDTH_LOW (1 << 31)
+#define DDR_CONF2_REG_VAL (DDR_BURST_LEN(8) | DDR_CNTL_OE_EN | \
+ DDR_CKE | DDR_TWR(6) | DDR_TRTW(14) | \
+ DDR_TRTP(8) | DDR_TWTR(14) | \
+ DDR_G_OPEN_L(7) | DDR_HALF_WIDTH_LOW)
+
+#define DDR2_CONF_TWL_S 10
+#define DDR2_CONF_TWL_M 0xf
+#define DDR2_CONF_TWL(x) (((x) & DDR2_CONF_TWL_M) << DDR2_CONF_TWL_S)
+#define DDR2_CONF_ODT BIT(9)
+#define DDR2_CONF_TFAW_S 2
+#define DDR2_CONF_TFAW_M 0x3f
+#define DDR2_CONF_TFAW(x) (((x) & DDR2_CONF_TFAW_M) << DDR2_CONF_TFAW_S)
+#define DDR2_CONF_EN BIT(0)
+#define DDR2_CONF_VAL (DDR2_CONF_TWL(2) | DDR2_CONF_ODT | \
+ DDR2_CONF_TFAW(22) | DDR2_CONF_EN)
+
+#define DDR1_EXT_MODE_VAL 0x02
+#define DDR2_EXT_MODE_VAL 0x402
+#define DDR2_EXT_MODE_OCD_VAL 0x382
+#define DDR1_MODE_DLL_VAL 0x133
+#define DDR2_MODE_DLL_VAL 0x100
+#define DDR1_MODE_VAL 0x33
+#define DDR2_MODE_VAL 0xa33
+#define DDR_TAP_VAL0 0x08
+#define DDR_TAP_VAL1 0x09
+
+void ddr_init(void)
+{
+ void __iomem *regs;
+ u32 val;
+
+ regs = map_physmem(AR71XX_DDR_CTRL_BASE, AR71XX_DDR_CTRL_SIZE,
+ MAP_NOCACHE);
+
+ writel(DDR_CONF_REG_VAL, regs + AR71XX_DDR_REG_CONFIG);
+ writel(DDR_CONF2_REG_VAL, regs + AR71XX_DDR_REG_CONFIG2);
+
+ val = get_bootstrap();
+ if (val & AR933X_BOOTSTRAP_DDR2) {
+ /* AHB maximum timeout */
+ writel(0xfffff, regs + AR933X_DDR_REG_TIMEOUT_MAX);
+
+ /* Enable DDR2 */
+ writel(DDR2_CONF_VAL, regs + AR933X_DDR_REG_DDR2_CONFIG);
+
+ /* Precharge All */
+ writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL);
+
+ /* Disable High Temperature Self-Refresh, Full Array */
+ writel(0x00, regs + AR933X_DDR_REG_EMR2);
+ /* Extended Mode Register 2 Set (EMR2S) */
+ writel(DDR_CTRL_UPD_EMR2S, regs + AR71XX_DDR_REG_CONTROL);
+
+ writel(0x00, regs + AR933X_DDR_REG_EMR3);
+ /* Extended Mode Register 3 Set (EMR3S) */
+ writel(DDR_CTRL_UPD_EMR3S, regs + AR71XX_DDR_REG_CONTROL);
+
+ /* Enable DLL, Full strength, ODT Disabled */
+ writel(0x00, regs + AR71XX_DDR_REG_EMR);
+ /* Extended Mode Register Set (EMRS) */
+ writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL);
+
+ /* Reset DLL */
+ writel(DDR2_MODE_DLL_VAL, regs + AR71XX_DDR_REG_MODE);
+ /* Mode Register Set (MRS) */
+ writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL);
+
+ /* Precharge All */
+ writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL);
+
+ /* Auto Refresh */
+ writel(DDR_CTRL_AUTO_REFRESH, regs + AR71XX_DDR_REG_CONTROL);
+ writel(DDR_CTRL_AUTO_REFRESH, regs + AR71XX_DDR_REG_CONTROL);
+
+ /* Write recovery (WR) 6 clock, CAS Latency 3,
+ * Burst Length 8 */
+ writel(DDR2_MODE_VAL, regs + AR71XX_DDR_REG_MODE);
+ /* Mode Register Set (MRS) */
+ writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL);
+
+ /* Enable OCD defaults, Enable DLL,
+ * Reduced Drive Strength */
+ writel(DDR2_EXT_MODE_OCD_VAL, regs + AR71XX_DDR_REG_EMR);
+ /* Extended Mode Register Set (EMRS) */
+ writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL);
+
+ /* OCD exit, Enable DLL, Enable /DQS,
+ * Reduced Drive Strength */
+ writel(DDR2_EXT_MODE_VAL, regs + AR71XX_DDR_REG_EMR);
+ /* Extended Mode Register Set (EMRS) */
+ writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL);
+
+ /* Refresh time control */
+ if (val & AR933X_BOOTSTRAP_REF_CLK_40)
+ writel(DDR_REFRESH_VAL_40M, regs +
+ AR71XX_DDR_REG_REFRESH);
+ else
+ writel(DDR_REFRESH_VAL_25M, regs +
+ AR71XX_DDR_REG_REFRESH);
+
+ /* DQS 0 Tap Control */
+ writel(DDR_TAP_VAL0, regs + AR71XX_DDR_REG_TAP_CTRL0);
+ /* DQS 1 Tap Control */
+ writel(DDR_TAP_VAL1, regs + AR71XX_DDR_REG_TAP_CTRL1);
+
+ /* For 16-bit DDR */
+ writel(0xff, regs + AR71XX_DDR_REG_RD_CYCLE);
+ } else {
+ /* AHB maximum timeout */
+ writel(0xfffff, regs + AR933X_DDR_REG_TIMEOUT_MAX);
+
+ /* Precharge All */
+ writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL);
+
+ /* Reset DLL, Burst Length 8, CAS Latency 3 */
+ writel(DDR1_MODE_DLL_VAL, regs + AR71XX_DDR_REG_MODE);
+ /* Forces an MRS update cycle in DDR */
+ writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL);
+
+ /* Enable DLL, Full strength */
+ writel(DDR1_EXT_MODE_VAL, regs + AR71XX_DDR_REG_EMR);
+ /* Extended Mode Register Set (EMRS) */
+ writel(DDR_CTRL_UPD_EMRS, regs + AR71XX_DDR_REG_CONTROL);
+
+ /* Precharge All */
+ writel(DDR_CTRL_PRECHARGE, regs + AR71XX_DDR_REG_CONTROL);
+
+ /* Normal DLL, Burst Length 8, CAS Latency 3 */
+ writel(DDR1_MODE_VAL, regs + AR71XX_DDR_REG_MODE);
+ /* Mode Register Set (MRS) */
+ writel(DDR_CTRL_UPD_MRS, regs + AR71XX_DDR_REG_CONTROL);
+
+ /* Refresh time control */
+ if (val & AR933X_BOOTSTRAP_REF_CLK_40)
+ writel(DDR_REFRESH_VAL_40M, regs +
+ AR71XX_DDR_REG_REFRESH);
+ else
+ writel(DDR_REFRESH_VAL_25M, regs +
+ AR71XX_DDR_REG_REFRESH);
+
+ /* DQS 0 Tap Control */
+ writel(DDR_TAP_VAL0, regs + AR71XX_DDR_REG_TAP_CTRL0);
+ /* DQS 1 Tap Control */
+ writel(DDR_TAP_VAL1, regs + AR71XX_DDR_REG_TAP_CTRL1);
+
+ /* For 16-bit DDR */
+ writel(0xff, regs + AR71XX_DDR_REG_RD_CYCLE);
+ }
+}
+
+void ddr_tap_tuning(void)
+{
+ void __iomem *regs;
+ u32 *addr_k0, *addr_k1, *addr;
+ u32 val, tap, upper, lower;
+ int i, j, dir, err, done;
+
+ regs = map_physmem(AR71XX_DDR_CTRL_BASE, AR71XX_DDR_CTRL_SIZE,
+ MAP_NOCACHE);
+
+ addr = (void *)KSEG0ADDR(0x2000);
+ for (i = 0; i < 256; i++) {
+ val = 0;
+ for (j = 0; j < 8; j++) {
+ if (i & (1 << j)) {
+ if (j % 2)
+ val |= 0xffff0000;
+ else
+ val |= 0x0000ffff;
+ }
+
+ if (j % 2) {
+ *addr++ = val;
+ val = 0;
+ }
+ }
+ }
+
+ err = 0;
+ done = 0;
+ dir = 1;
+ tap = readl(regs + AR71XX_DDR_REG_TAP_CTRL0);
+ val = tap;
+ while (!done) {
+ err = 0;
+ writel(val, regs + AR71XX_DDR_REG_TAP_CTRL0);
+ writel(val, regs + AR71XX_DDR_REG_TAP_CTRL1);
+ for (i = 0; i < 2; i++) {
+ addr_k1 = (void *)KSEG1ADDR(0x2000);
+ addr_k0 = (void *)KSEG0ADDR(0x2000);
+ addr = (void *)KSEG0ADDR(0x3000);
+
+ while (addr_k0 < addr) {
+ if (*addr_k1++ != *addr_k0++) {
+ err = 1;
+ break;
+ }
+ }
+
+ if (err)
+ break;
+ }
+
+ if (err) {
+ if (dir) {
+ dir = 0;
+ val--;
+ upper = val;
+ val = tap;
+ } else {
+ val++;
+ lower = val;
+ done = 1;
+ }
+ } else {
+ if (dir) {
+ if (val < 0x20) {
+ val++;
+ } else {
+ dir = 0;
+ upper = val;
+ val = tap;
+ }
+ } else {
+ if (!val) {
+ lower = val;
+ done = 1;
+ } else {
+ val--;
+ }
+ }
+ }
+ }
+ val = (upper + lower) / 2;
+ writel(val, regs + AR71XX_DDR_REG_TAP_CTRL0);
+ val++;
+ writel(val, regs + AR71XX_DDR_REG_TAP_CTRL1);
+}
diff --git a/arch/mips/mach-ath79/ar933x/lowlevel_init.S b/arch/mips/mach-ath79/ar933x/lowlevel_init.S
new file mode 100644
index 0000000..ac4c364
--- /dev/null
+++ b/arch/mips/mach-ath79/ar933x/lowlevel_init.S
@@ -0,0 +1,280 @@
+/*
+ * (C) Copyright 2015
+ * Wills Wang, <wills.wang@live.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <asm/asm.h>
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+#include <asm/addrspace.h>
+#include <mach/ar71xx_regs.h>
+
+#define SET_BIT(val, bit) ((val) | (1 << (bit)))
+#define SET_PLL_PD(val) SET_BIT(val, 30)
+#define AHB_DIV_TO_4(val) SET_BIT(SET_BIT(val, 15), 16)
+#define PLL_BYPASS(val) SET_BIT(val, 2)
+
+#define MK_PLL_CONF(divint, refdiv, range, outdiv) \
+ (((0x3F & divint) << 10) | \
+ ((0x1F & refdiv) << 16) | \
+ ((0x1 & range) << 21) | \
+ ((0x7 & outdiv) << 23) )
+
+#define MK_CLK_CNTL(cpudiv, ddrdiv, ahbdiv) \
+ (((0x3 & (cpudiv - 1)) << 5) | \
+ ((0x3 & (ddrdiv - 1)) << 10) | \
+ ((0x3 & (ahbdiv - 1)) << 15) )
+
+/*
+ * PLL_CPU_CONFIG_VAL
+ *
+ * Bit30 is set (CPU_PLLPWD = 1 -> power down control for CPU PLL)
+ * After PLL configuration we need to clear this bit
+ *
+ * Values written into CPU PLL Configuration (CPU_PLL_CONFIG)
+ *
+ * bits 10..15 (6bit) DIV_INT (Integer part of the DIV to CPU PLL)
+ * => 32 (0x20) VCOOUT = XTAL * DIV_INT
+ * bits 16..20 (5bit) REFDIV (Reference clock divider)
+ * => 1 (0x1) [Must start at values 1]
+ * bits 21 (1bit) RANGE (VCO frequency range of the CPU PLL)
+ * => 0 (0x0) [Doesn't impact clock values]
+ * bits 23..25 (3bit) OUTDIV (Ratio between VCO and PLL output)
+ * => 1 (0x1) [0 is illegal!]
+ * PLLOUT = VCOOUT * (1/2^OUTDIV)
+ */
+/* DIV_INT=32 (25MHz*32/2=400MHz), REFDIV=1, RANGE=0, OUTDIV=1 */
+#define PLL_CPU_CONFIG_VAL_40M MK_PLL_CONF(20, 1, 0, 1)
+/* DIV_INT=20 (40MHz*20/2=400MHz), REFDIV=1, RANGE=0, OUTDIV=1 */
+#define PLL_CPU_CONFIG_VAL_25M MK_PLL_CONF(32, 1, 0, 1)
+
+/*
+ * PLL_CLK_CONTROL_VAL
+ *
+ * In PLL_CLK_CONTROL_VAL bit 2 is set (BYPASS = 1 -> bypass PLL)
+ * After PLL configuration we need to clear this bit
+ *
+ * Values written into CPU Clock Control Register CLOCK_CONTROL
+ *
+ * bits 2 (1bit) BYPASS (Bypass PLL. This defaults to 1 for test.
+ * Software must enable the CPU PLL for normal and
+ * then set this bit to 0)
+ * bits 5..6 (2bit) CPU_POST_DIV => 0 (DEFAULT, Ratio = 1)
+ * CPU_CLK = PLLOUT / CPU_POST_DIV
+ * bits 10..11 (2bit) DDR_POST_DIV => 0 (DEFAULT, Ratio = 1)
+ * DDR_CLK = PLLOUT / DDR_POST_DIV
+ * bits 15..16 (2bit) AHB_POST_DIV => 1 (DEFAULT, Ratio = 2)
+ * AHB_CLK = PLLOUT / AHB_POST_DIV
+ *
+ */
+#define PLL_CLK_CONTROL_VAL MK_CLK_CNTL(1, 1, 2)
+
+ .text
+ .set noreorder
+
+LEAF(lowlevel_init)
+ /* These three WLAN_RESET will avoid original issue */
+ li t3, 0x03
+1:
+ li t0, KSEG1ADDR(AR71XX_RESET_BASE)
+ lw t1, AR933X_RESET_REG_RESET_MODULE(t0)
+ ori t1, t1, 0x0800
+ sw t1, AR933X_RESET_REG_RESET_MODULE(t0)
+ nop
+ lw t1, AR933X_RESET_REG_RESET_MODULE(t0)
+ li t2, 0xfffff7ff
+ and t1, t1, t2
+ sw t1, AR933X_RESET_REG_RESET_MODULE(t0)
+ nop
+ addi t3, t3, -1
+ bnez t3, 1b
+ nop
+
+ li t2, 0x20
+2:
+ beqz t2, 1b
+ nop
+ addi t2, t2, -1
+ lw t5, AR933X_RESET_REG_BOOTSTRAP(t0)
+ andi t1, t5, 0x10
+ bnez t1, 2b
+ nop
+
+ li t1, 0x02110E
+ sw t1, AR933X_RESET_REG_BOOTSTRAP(t0)
+ nop
+
+ /* RTC Force Wake */
+ li t0, KSEG1ADDR(AR933X_RTC_BASE)
+ li t1, 0x03
+ sw t1, AR933X_RTC_REG_FORCE_WAKE(t0)
+ nop
+ nop
+
+ /* RTC Reset */
+ li t1, 0x00
+ sw t1, AR933X_RTC_REG_RESET(t0)
+ nop
+ nop
+
+ li t1, 0x01
+ sw t1, AR933X_RTC_REG_RESET(t0)
+ nop
+ nop
+
+ /* Wait for RTC in on state */
+1:
+ lw t1, AR933X_RTC_REG_STATUS(t0)
+ andi t1, t1, 0x02
+ beqz t1, 1b
+ nop
+
+ /* Program ki/kd */
+ li t0, KSEG1ADDR(AR933X_SRIF_BASE)
+ andi t1, t5, 0x01 # t5 BOOT_STRAP
+ bnez t1, 1f
+ nop
+ li t1, 0x19e82f01
+ b 2f
+ nop
+1:
+ li t1, 0x18e82f01
+2:
+ sw t1, AR933X_SRIF_DDR_DPLL2_REG(t0)
+
+ /* Program phase shift */
+ lw t1, AR933X_SRIF_DDR_DPLL3_REG(t0)
+ li t2, 0xc07fffff
+ and t1, t1, t2
+ li t2, 0x800000
+ or t1, t1, t2
+ sw t1, AR933X_SRIF_DDR_DPLL3_REG(t0)
+ nop
+
+ /* in some cases, the SoC doesn't start with higher clock on AHB */
+ li t0, KSEG1ADDR(AR71XX_PLL_BASE)
+ li t1, AHB_DIV_TO_4(PLL_BYPASS(PLL_CLK_CONTROL_VAL))
+ sw t1, AR933X_PLL_CLK_CTRL_REG(t0)
+ nop
+
+ /* Set SETTLE_TIME in CPU PLL */
+ andi t1, t5, 0x01 # t5 BOOT_STRAP
+ bnez t1, 1f
+ nop
+ li t1, 0x0352
+ b 2f
+ nop
+1:
+ li t1, 0x0550
+2:
+ sw t1, AR71XX_PLL_REG_SEC_CONFIG(t0)
+ nop
+
+ /* Set nint, frac, refdiv, outdiv, range according to xtal */
+0:
+ andi t1, t5, 0x01 # t5 BOOT_STRAP
+ bnez t1, 1f
+ nop
+ li t1, SET_PLL_PD(PLL_CPU_CONFIG_VAL_25M)
+ b 2f
+ nop
+1:
+ li t1, SET_PLL_PD(PLL_CPU_CONFIG_VAL_40M)
+2:
+ sw t1, AR933X_PLL_CPU_CONFIG_REG(t0)
+ nop
+1:
+ lw t1, AR933X_PLL_CPU_CONFIG_REG(t0)
+ li t2, 0x80000000
+ and t1, t1, t2
+ bnez t1, 1b
+ nop
+
+ /* Put frac bit19:10 configuration */
+ li t1, 0x1003E8
+ sw t1, AR933X_PLL_DITHER_FRAC_REG(t0)
+ nop
+
+ /* Clear PLL power down bit in CPU PLL configuration */
+ andi t1, t5, 0x01 # t5 BOOT_STRAP
+ bnez t1, 1f
+ nop
+ li t1, PLL_CPU_CONFIG_VAL_25M
+ b 2f
+ nop
+1:
+ li t1, PLL_CPU_CONFIG_VAL_40M
+2:
+ sw t1, AR933X_PLL_CPU_CONFIG_REG(t0)
+ nop
+
+ /* Wait for PLL update -> bit 31 in CPU_PLL_CONFIG should be 0 */
+1:
+ lw t1, AR933X_PLL_CPU_CONFIG_REG(t0)
+ li t2, 0x80000000
+ and t1, t1, t2
+ bnez t1, 1b
+ nop
+
+ /* Confirm DDR PLL lock */
+ li t3, 100
+ li t4, 0
+
+2:
+ addi t4, t4, 1
+ bgt t4, t3, 0b
+ nop
+
+ li t3, 5
+3:
+ /* Clear do_meas */
+ li t0, KSEG1ADDR(AR933X_SRIF_BASE)
+ lw t1, AR933X_SRIF_DDR_DPLL3_REG(t0)
+ li t2, 0xBFFFFFFF
+ and t1, t1, t2
+ sw t1, AR933X_SRIF_DDR_DPLL3_REG(t0)
+ nop
+
+ li t2, 10
+1:
+ subu t2, t2, 1
+ bnez t2, 1b
+ nop
+
+ /* Set do_meas */
+ li t2, 0x40000000
+ or t1, t1, t2
+ sw t1, AR933X_SRIF_DDR_DPLL3_REG(t0)
+ nop
+
+ /* Check meas_done */
+1:
+ lw t1, AR933X_SRIF_DDR_DPLL4_REG(t0)
+ andi t1, t1, 0x8
+ beqz t1, 1b
+ nop
+
+ lw t1, AR933X_SRIF_DDR_DPLL3_REG(t0)
+ li t2, 0x007FFFF8
+ and t1, t1, t2
+ srl t1, t1, 3
+ li t2, 0x4000
+ bgt t1, t2, 2b
+ nop
+ addi t3, t3, -1
+ bnez t3, 3b
+ nop
+
+ /* clear PLL bypass (bit 2) in CPU CLOCK CONTROL register */
+ li t0, KSEG1ADDR(AR71XX_PLL_BASE)
+ li t1, PLL_CLK_CONTROL_VAL
+ sw t1, AR933X_PLL_CLK_CTRL_REG(t0)
+ nop
+
+ nop
+ jr ra
+ nop
+ END(lowlevel_init)
--
1.9.1