ar71xx: fix CPU/DDR frequency calculation for SRIF PLLs on AR934x

SVN-Revision: 33335

1 files changed, 205 insertions, 0 deletions

diff --git a/target/linux/ar71xx/patches-3.3/137-MIPS-ath79-fix-CPU-DDR-frequency-calculation-for-SRI.patch b/target/linux/ar71xx/patches-3.3/137-MIPS-ath79-fix-CPU-DDR-frequency-calculation-for-SRI.patch
new file mode 100644
index 0000000000..a2fa4db56c
--- /dev/null
+++ b/target/linux/ar71xx/patches-3.3/137-MIPS-ath79-fix-CPU-DDR-frequency-calculation-for-SRI.patch
@@ -0,0 +1,205 @@
+From 3f735e202d5099a5b7c621443bea365b87b0e3bb Mon Sep 17 00:00:00 2001
+From: Gabor Juhos <juhosg@openwrt.org>
+Date: Sat, 8 Sep 2012 12:12:50 +0200
+Subject: [PATCH] MIPS: ath79: fix CPU/DDR frequency calculation for SRIF PLLs
+
+Besides the CPU and DDR PLLs, the CPU and DDR frequencies
+can be derived from other PLLs in the SRIF block on the
+AR934x SoCs. The current code does not checks if the SRIF
+PLLs are used and this can lead to incorrectly calculated
+CPU/DDR frequencies.
+
+Fix it by calculating the frequencies from SRIF PLLs if
+those are used on a given board.
+
+Cc: <stable@vger.kernel.org>
+Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
+---
+This depends on the following patch:
+'MIPS: ath79: use correct fractional dividers for {CPU,DDR}_PLL on AR934x'
+https://patchwork.linux-mips.org/patch/4305/
+
+ arch/mips/ath79/clock.c                        |  109 ++++++++++++++++++------
+ arch/mips/include/asm/mach-ath79/ar71xx_regs.h |   23 +++++
+ 2 files changed, 104 insertions(+), 28 deletions(-)
+
+--- a/arch/mips/ath79/clock.c
++++ b/arch/mips/ath79/clock.c
+@@ -17,6 +17,8 @@
+ #include <linux/err.h>
+ #include <linux/clk.h>
+ 
++#include <asm/div64.h>
++
+ #include <asm/mach-ath79/ath79.h>
+ #include <asm/mach-ath79/ar71xx_regs.h>
+ #include "common.h"
+@@ -166,11 +168,34 @@ static void __init ar933x_clocks_init(vo
+ 	ath79_uart_clk.rate = ath79_ref_clk.rate;
+ }
+ 
++static u32 __init ar934x_get_pll_freq(u32 ref, u32 ref_div, u32 nint, u32 nfrac,
++				      u32 frac, u32 out_div)
++{
++	u64 t;
++	u32 ret;
++
++	t = ath79_ref_clk.rate;
++	t *= nint;
++	do_div(t, ref_div);
++	ret = t;
++
++	t = ath79_ref_clk.rate;
++	t *= nfrac;
++	do_div(t, ref_div * frac);
++	ret += t;
++
++	ret /= (1 << out_div);
++	return ret;
++}
++
+ static void __init ar934x_clocks_init(void)
+ {
+-	u32 pll, out_div, ref_div, nint, frac, clk_ctrl, postdiv;
++	u32 pll, out_div, ref_div, nint, nfrac, frac, clk_ctrl, postdiv;
+ 	u32 cpu_pll, ddr_pll;
+ 	u32 bootstrap;
++	void __iomem *dpll_base;
++
++	dpll_base = ioremap(AR934X_SRIF_BASE, AR934X_SRIF_SIZE);
+ 
+ 	bootstrap = ath79_reset_rr(AR934X_RESET_REG_BOOTSTRAP);
+ 	if (bootstrap &	AR934X_BOOTSTRAP_REF_CLK_40)
+@@ -178,33 +203,59 @@ static void __init ar934x_clocks_init(vo
+ 	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 * (1 << 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 * (1 << 10));
+-	ddr_pll /= (1 << out_div);
++	pll = __raw_readl(dpll_base + AR934X_SRIF_CPU_DPLL2_REG);
++	if (pll & AR934X_SRIF_DPLL2_LOCAL_PLL) {
++		out_div = (pll >> AR934X_SRIF_DPLL2_OUTDIV_SHIFT) &
++			  AR934X_SRIF_DPLL2_OUTDIV_MASK;
++		pll = __raw_readl(dpll_base + AR934X_SRIF_CPU_DPLL1_REG);
++		nint = (pll >> AR934X_SRIF_DPLL1_NINT_SHIFT) &
++		       AR934X_SRIF_DPLL1_NINT_MASK;
++		nfrac = pll & AR934X_SRIF_DPLL1_NFRAC_MASK;
++		ref_div = (pll >> AR934X_SRIF_DPLL1_REFDIV_SHIFT) &
++			  AR934X_SRIF_DPLL1_REFDIV_MASK;
++		frac = 1 << 18;
++	} else {
++		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;
++		nfrac = (pll >> AR934X_PLL_CPU_CONFIG_NFRAC_SHIFT) &
++			AR934X_PLL_CPU_CONFIG_NFRAC_MASK;
++		frac = 1 << 6;
++	}
++
++	cpu_pll = ar934x_get_pll_freq(ath79_ref_clk.rate, ref_div, nint,
++				      nfrac, frac, out_div);
++
++	pll = __raw_readl(dpll_base + AR934X_SRIF_DDR_DPLL2_REG);
++	if (pll & AR934X_SRIF_DPLL2_LOCAL_PLL) {
++		out_div = (pll >> AR934X_SRIF_DPLL2_OUTDIV_SHIFT) &
++			  AR934X_SRIF_DPLL2_OUTDIV_MASK;
++		pll = __raw_readl(dpll_base + AR934X_SRIF_DDR_DPLL1_REG);
++		nint = (pll >> AR934X_SRIF_DPLL1_NINT_SHIFT) &
++		       AR934X_SRIF_DPLL1_NINT_MASK;
++		nfrac = pll & AR934X_SRIF_DPLL1_NFRAC_MASK;
++		ref_div = (pll >> AR934X_SRIF_DPLL1_REFDIV_SHIFT) &
++			  AR934X_SRIF_DPLL1_REFDIV_MASK;
++		frac = 1 << 18;
++	} else {
++		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;
++		nfrac = (pll >> AR934X_PLL_DDR_CONFIG_NFRAC_SHIFT) &
++			AR934X_PLL_DDR_CONFIG_NFRAC_MASK;
++		frac = 1 << 10;
++	}
++
++	ddr_pll = ar934x_get_pll_freq(ath79_ref_clk.rate, ref_div, nint,
++				      nfrac, frac, out_div);
+ 
+ 	clk_ctrl = ath79_pll_rr(AR934X_PLL_CPU_DDR_CLK_CTRL_REG);
+ 
+@@ -240,6 +291,8 @@ static void __init ar934x_clocks_init(vo
+ 
+ 	ath79_wdt_clk.rate = ath79_ref_clk.rate;
+ 	ath79_uart_clk.rate = ath79_ref_clk.rate;
++
++	iounmap(dpll_base);
+ }
+ 
+ void __init ath79_clocks_init(void)
+--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
++++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+@@ -65,6 +65,8 @@
+ #define AR934X_WMAC_SIZE	0x20000
+ #define AR934X_EHCI_BASE	0x1b000000
+ #define AR934X_EHCI_SIZE	0x200
++#define AR934X_SRIF_BASE	(AR71XX_APB_BASE + 0x00116000)
++#define AR934X_SRIF_SIZE	0x1000
+ 
+ /*
+  * DDR_CTRL block
+@@ -405,4 +407,25 @@
+ #define AR933X_GPIO_COUNT		30
+ #define AR934X_GPIO_COUNT		23
+ 
++/*
++ * SRIF block
++ */
++#define AR934X_SRIF_CPU_DPLL1_REG	0x1c0
++#define AR934X_SRIF_CPU_DPLL2_REG	0x1c4
++#define AR934X_SRIF_CPU_DPLL3_REG	0x1c8
++
++#define AR934X_SRIF_DDR_DPLL1_REG	0x240
++#define AR934X_SRIF_DDR_DPLL2_REG	0x244
++#define AR934X_SRIF_DDR_DPLL3_REG	0x248
++
++#define AR934X_SRIF_DPLL1_REFDIV_SHIFT	27
++#define AR934X_SRIF_DPLL1_REFDIV_MASK	0x1f
++#define AR934X_SRIF_DPLL1_NINT_SHIFT	18
++#define AR934X_SRIF_DPLL1_NINT_MASK	0x1ff
++#define AR934X_SRIF_DPLL1_NFRAC_MASK	0x0003ffff
++
++#define AR934X_SRIF_DPLL2_LOCAL_PLL	BIT(30)
++#define AR934X_SRIF_DPLL2_OUTDIV_SHIFT	13
++#define AR934X_SRIF_DPLL2_OUTDIV_MASK	0x7
++
+ #endif /* __ASM_MACH_AR71XX_REGS_H */