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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 */
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