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[PATCH 04/16] MIPS: ath79: add clock initialization code for AR934X

To: Ralf Baechle <ralf@linux-mips.org>
Subject: [PATCH 04/16] MIPS: ath79: add clock initialization code for AR934X
From: Gabor Juhos <juhosg@openwrt.org>
Date: Fri, 23 Dec 2011 19:25:30 +0100
Cc: linux-mips@linux-mips.org, "Luis R. Rodriguez" <mcgrof@qca.qualcomm.com>, mcgrof@infradead.org, Gabor Juhos <juhosg@openwrt.org>
In-reply-to: <1324664742-3648-1-git-send-email-juhosg@openwrt.org>
References: <1324664742-3648-1-git-send-email-juhosg@openwrt.org>
Sender: linux-mips-bounce@linux-mips.org
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Acked-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
---
 arch/mips/ath79/clock.c                        |   81 ++++++++++++++++++++++++
 arch/mips/include/asm/mach-ath79/ar71xx_regs.h |   53 +++++++++++++++
 2 files changed, 134 insertions(+), 0 deletions(-)

diff --git a/arch/mips/ath79/clock.c b/arch/mips/ath79/clock.c
index 54d0eb4..b91ad3e 100644
--- a/arch/mips/ath79/clock.c
+++ b/arch/mips/ath79/clock.c
@@ -1,8 +1,11 @@
 /*
  *  Atheros AR71XX/AR724X/AR913X common routines
  *
+ *  Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
  *  Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
  *
+ *  Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
+ *
  *  This program is free software; you can redistribute it and/or modify it
  *  under the terms of the GNU General Public License version 2 as published
  *  by the Free Software Foundation.
@@ -163,6 +166,82 @@ static void __init ar933x_clocks_init(void)
        ath79_uart_clk.rate = ath79_ref_clk.rate;
 }
 
+static void __init ar934x_clocks_init(void)
+{
+       u32 pll, out_div, ref_div, nint, frac, clk_ctrl, postdiv;
+       u32 cpu_pll, ddr_pll;
+       u32 bootstrap;
+
+       bootstrap = ath79_reset_rr(AR934X_RESET_REG_BOOTSTRAP);
+       if (bootstrap & AR934X_BOOTSTRAP_REF_CLK_40)
+               ath79_ref_clk.rate = 40 * 1000 * 1000;
+       else
+               ath79_ref_clk.rate = 25 * 1000 * 1000;
+
+       pll = ath79_pll_rr(AR934X_PLL_CPU_CONFIG_REG);
+       out_div = (pll >> AR934X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
+                 AR934X_PLL_CPU_CONFIG_OUTDIV_MASK;
+       ref_div = (pll >> AR934X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
+                 AR934X_PLL_CPU_CONFIG_REFDIV_MASK;
+       nint = (pll >> AR934X_PLL_CPU_CONFIG_NINT_SHIFT) &
+              AR934X_PLL_CPU_CONFIG_NINT_MASK;
+       frac = (pll >> AR934X_PLL_CPU_CONFIG_NFRAC_SHIFT) &
+              AR934X_PLL_CPU_CONFIG_NFRAC_MASK;
+
+       cpu_pll = nint * ath79_ref_clk.rate / ref_div;
+       cpu_pll += frac * ath79_ref_clk.rate / (ref_div * (2 << 6));
+       cpu_pll /= (1 << out_div);
+
+       pll = ath79_pll_rr(AR934X_PLL_DDR_CONFIG_REG);
+       out_div = (pll >> AR934X_PLL_DDR_CONFIG_OUTDIV_SHIFT) &
+                 AR934X_PLL_DDR_CONFIG_OUTDIV_MASK;
+       ref_div = (pll >> AR934X_PLL_DDR_CONFIG_REFDIV_SHIFT) &
+                 AR934X_PLL_DDR_CONFIG_REFDIV_MASK;
+       nint = (pll >> AR934X_PLL_DDR_CONFIG_NINT_SHIFT) &
+              AR934X_PLL_DDR_CONFIG_NINT_MASK;
+       frac = (pll >> AR934X_PLL_DDR_CONFIG_NFRAC_SHIFT) &
+              AR934X_PLL_DDR_CONFIG_NFRAC_MASK;
+
+       ddr_pll = nint * ath79_ref_clk.rate / ref_div;
+       ddr_pll += frac * ath79_ref_clk.rate / (ref_div * (2 << 10));
+       ddr_pll /= (1 << out_div);
+
+       clk_ctrl = ath79_pll_rr(AR934X_PLL_CPU_DDR_CLK_CTRL_REG);
+
+       postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_POST_DIV_SHIFT) &
+                 AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_POST_DIV_MASK;
+
+       if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_PLL_BYPASS)
+               ath79_cpu_clk.rate = ath79_ref_clk.rate;
+       else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_CPUCLK_FROM_CPUPLL)
+               ath79_cpu_clk.rate = cpu_pll / (postdiv + 1);
+       else
+               ath79_cpu_clk.rate = ddr_pll / (postdiv + 1);
+
+       postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_POST_DIV_SHIFT) &
+                 AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_POST_DIV_MASK;
+
+       if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_PLL_BYPASS)
+               ath79_ddr_clk.rate = ath79_ref_clk.rate;
+       else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_DDRCLK_FROM_DDRPLL)
+               ath79_ddr_clk.rate = ddr_pll / (postdiv + 1);
+       else
+               ath79_ddr_clk.rate = cpu_pll / (postdiv + 1);
+
+       postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_POST_DIV_SHIFT) &
+                 AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_POST_DIV_MASK;
+
+       if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_PLL_BYPASS)
+               ath79_ahb_clk.rate = ath79_ref_clk.rate;
+       else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_AHBCLK_FROM_DDRPLL)
+               ath79_ahb_clk.rate = ddr_pll / (postdiv + 1);
+       else
+               ath79_ahb_clk.rate = cpu_pll / (postdiv + 1);
+
+       ath79_wdt_clk.rate = ath79_ref_clk.rate;
+       ath79_uart_clk.rate = ath79_ref_clk.rate;
+}
+
 void __init ath79_clocks_init(void)
 {
        if (soc_is_ar71xx())
@@ -173,6 +252,8 @@ void __init ath79_clocks_init(void)
                ar913x_clocks_init();
        else if (soc_is_ar933x())
                ar933x_clocks_init();
+       else if (soc_is_ar934x())
+               ar934x_clocks_init();
        else
                BUG();
 
diff --git a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h 
b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
index 4e3c55d..bc1c345 100644
--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
@@ -151,6 +151,41 @@
 #define AR933X_PLL_CLOCK_CTRL_AHB_DIV_SHIFT    15
 #define AR933X_PLL_CLOCK_CTRL_AHB_DIV_MASK     0x7
 
+#define AR934X_PLL_CPU_CONFIG_REG              0x00
+#define AR934X_PLL_DDR_CONFIG_REG              0x04
+#define AR934X_PLL_CPU_DDR_CLK_CTRL_REG                0x08
+
+#define AR934X_PLL_CPU_CONFIG_NFRAC_SHIFT      0
+#define AR934X_PLL_CPU_CONFIG_NFRAC_MASK       0x3f
+#define AR934X_PLL_CPU_CONFIG_NINT_SHIFT       6
+#define AR934X_PLL_CPU_CONFIG_NINT_MASK                0x3f
+#define AR934X_PLL_CPU_CONFIG_REFDIV_SHIFT     12
+#define AR934X_PLL_CPU_CONFIG_REFDIV_MASK      0x1f
+#define AR934X_PLL_CPU_CONFIG_OUTDIV_SHIFT     19
+#define AR934X_PLL_CPU_CONFIG_OUTDIV_MASK      0x3
+
+#define AR934X_PLL_DDR_CONFIG_NFRAC_SHIFT      0
+#define AR934X_PLL_DDR_CONFIG_NFRAC_MASK       0x3ff
+#define AR934X_PLL_DDR_CONFIG_NINT_SHIFT       10
+#define AR934X_PLL_DDR_CONFIG_NINT_MASK                0x3f
+#define AR934X_PLL_DDR_CONFIG_REFDIV_SHIFT     16
+#define AR934X_PLL_DDR_CONFIG_REFDIV_MASK      0x1f
+#define AR934X_PLL_DDR_CONFIG_OUTDIV_SHIFT     23
+#define AR934X_PLL_DDR_CONFIG_OUTDIV_MASK      0x7
+
+#define AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_PLL_BYPASS     BIT(2)
+#define AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_PLL_BYPASS     BIT(3)
+#define AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_PLL_BYPASS     BIT(4)
+#define AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_POST_DIV_SHIFT 5
+#define AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_POST_DIV_MASK  0x1f
+#define AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_POST_DIV_SHIFT 10
+#define AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_POST_DIV_MASK  0x1f
+#define AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_POST_DIV_SHIFT 15
+#define AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_POST_DIV_MASK  0x1f
+#define AR934X_PLL_CPU_DDR_CLK_CTRL_CPUCLK_FROM_CPUPLL BIT(20)
+#define AR934X_PLL_CPU_DDR_CLK_CTRL_DDRCLK_FROM_DDRPLL BIT(21)
+#define AR934X_PLL_CPU_DDR_CLK_CTRL_AHBCLK_FROM_DDRPLL BIT(24)
+
 /*
  * USB_CONFIG block
  */
@@ -186,6 +221,8 @@
 #define AR933X_RESET_REG_RESET_MODULE          0x1c
 #define AR933X_RESET_REG_BOOTSTRAP             0xac
 
+#define AR934X_RESET_REG_BOOTSTRAP             0xb0
+
 #define MISC_INT_ETHSW                 BIT(12)
 #define MISC_INT_TIMER4                        BIT(10)
 #define MISC_INT_TIMER3                        BIT(9)
@@ -242,6 +279,22 @@
 
 #define AR933X_BOOTSTRAP_REF_CLK_40    BIT(0)
 
+#define AR934X_BOOTSTRAP_SW_OPTION8    BIT(23)
+#define AR934X_BOOTSTRAP_SW_OPTION7    BIT(22)
+#define AR934X_BOOTSTRAP_SW_OPTION6    BIT(21)
+#define AR934X_BOOTSTRAP_SW_OPTION5    BIT(20)
+#define AR934X_BOOTSTRAP_SW_OPTION4    BIT(19)
+#define AR934X_BOOTSTRAP_SW_OPTION3    BIT(18)
+#define AR934X_BOOTSTRAP_SW_OPTION2    BIT(17)
+#define AR934X_BOOTSTRAP_SW_OPTION1    BIT(16)
+#define AR934X_BOOTSTRAP_USB_MODE_DEVICE BIT(7)
+#define AR934X_BOOTSTRAP_PCIE_RC       BIT(6)
+#define AR934X_BOOTSTRAP_EJTAG_MODE    BIT(5)
+#define AR934X_BOOTSTRAP_REF_CLK_40    BIT(4)
+#define AR934X_BOOTSTRAP_BOOT_FROM_SPI BIT(2)
+#define AR934X_BOOTSTRAP_SDRAM_DISABLED        BIT(1)
+#define AR934X_BOOTSTRAP_DDR1          BIT(0)
+
 #define REV_ID_MAJOR_MASK              0xfff0
 #define REV_ID_MAJOR_AR71XX            0x00a0
 #define REV_ID_MAJOR_AR913X            0x00b0
-- 
1.7.2.1


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