+++ /dev/null
-/*
- * $Id$
- *
- * Copyright (C) 2007 OpenWrt.org
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <asm/addrspace.h>
-#include <asm/io.h>
-#include <asm/ar7/ar7.h>
-
-#define BOOT_PLL_SOURCE_MASK 0x3
-#define CPU_PLL_SOURCE_SHIFT 16
-#define BUS_PLL_SOURCE_SHIFT 14
-#define USB_PLL_SOURCE_SHIFT 18
-#define DSP_PLL_SOURCE_SHIFT 22
-#define BOOT_PLL_SOURCE_AFE 0
-#define BOOT_PLL_SOURCE_BUS 0
-#define BOOT_PLL_SOURCE_REF 1
-#define BOOT_PLL_SOURCE_XTAL 2
-#define BOOT_PLL_SOURCE_CPU 3
-#define BOOT_PLL_BYPASS 0x00000020
-#define BOOT_PLL_ASYNC_MODE 0x02000000
-#define BOOT_PLL_2TO1_MODE 0x00008000
-
-#define TNETD7200_CLOCK_ID_CPU 0
-#define TNETD7200_CLOCK_ID_DSP 1
-#define TNETD7200_CLOCK_ID_USB 2
-
-#define TNETD7200_DEF_CPU_CLK 211000000
-#define TNETD7200_DEF_DSP_CLK 125000000
-#define TNETD7200_DEF_USB_CLK 48000000
-
-struct tnetd7300_clock {
- volatile u32 ctrl;
-#define PREDIV_MASK 0x001f0000
-#define PREDIV_SHIFT 16
-#define POSTDIV_MASK 0x0000001f
- u32 unused1[3];
- volatile u32 pll;
-#define MUL_MASK 0x0000f000
-#define MUL_SHIFT 12
-#define PLL_MODE_MASK 0x00000001
-#define PLL_NDIV 0x00000800
-#define PLL_DIV 0x00000002
-#define PLL_STATUS 0x00000001
- u32 unused2[3];
-} __attribute__ ((packed));
-
-struct tnetd7300_clocks {
- struct tnetd7300_clock bus;
- struct tnetd7300_clock cpu;
- struct tnetd7300_clock usb;
- struct tnetd7300_clock dsp;
-} __attribute__ ((packed));
-
-struct tnetd7200_clock {
- volatile u32 ctrl;
- u32 unused1[3];
-#define DIVISOR_ENABLE_MASK 0x00008000
- volatile u32 mul;
- volatile u32 prediv;
- volatile u32 postdiv;
- volatile u32 postdiv2;
- u32 unused2[6];
- volatile u32 cmd;
- volatile u32 status;
- volatile u32 cmden;
- u32 padding[15];
-} __attribute__ ((packed));
-
-struct tnetd7200_clocks {
- struct tnetd7200_clock cpu;
- struct tnetd7200_clock dsp;
- struct tnetd7200_clock usb;
-} __attribute__ ((packed));
-
-int ar7_cpu_clock = 150000000;
-EXPORT_SYMBOL(ar7_cpu_clock);
-int ar7_bus_clock = 125000000;
-EXPORT_SYMBOL(ar7_bus_clock);
-int ar7_dsp_clock = 0;
-EXPORT_SYMBOL(ar7_dsp_clock);
-
-static int gcd(int a, int b)
-{
- int c;
-
- if ( a < b) {
- c = a;
- a = b;
- b = c;
- }
- while (c = (a % b)) {
- a = b;
- b = c;
- }
- return b;
-}
-
-static void approximate(int base, int target, int *prediv,
- int *postdiv, int *mul)
-{
- int i, j, k, freq, res = target;
- for (i = 1; i <= 16; i++) {
- for (j = 1; j <= 32; j++) {
- for (k = 1; k <= 32; k++) {
- freq = abs(base / j * i / k - target);
- if (freq < res) {
- res = freq;
- *mul = i;
- *prediv = j;
- *postdiv = k;
- }
- }
- }
- }
-}
-
-static void calculate(int base, int target, int *prediv, int *postdiv,
- int *mul)
-{
- int tmp_gcd, tmp_base, tmp_freq;
-
- for (*prediv = 1; *prediv <= 32; (*prediv)++) {
- tmp_base = base / *prediv;
- tmp_gcd = gcd(target, tmp_base);
- *mul = target / tmp_gcd;
- *postdiv = tmp_base / tmp_gcd;
- if ((*mul < 1) || (*mul >= 16))
- continue;
- if ((*postdiv > 0) & (*postdiv <= 32))
- break;
- }
-
- if (base / (*prediv) * (*mul) / (*postdiv) != target) {
- approximate(base, target, prediv, postdiv, mul);
- tmp_freq = base / (*prediv) * (*mul) / (*postdiv);
- printk(KERN_WARNING
- "Adjusted requested frequency %d to %d\n",
- target, tmp_freq);
- }
-
- printk(KERN_DEBUG "Clocks: prediv: %d, postdiv: %d, mul: %d\n",
- *prediv, *postdiv, *mul);
-}
-
-static int tnetd7300_dsp_clock(void)
-{
- u32 didr1, didr2;
- u8 rev = ar7_chip_rev();
- didr1 = readl((void *)KSEG1ADDR(AR7_REGS_GPIO + 0x18));
- didr2 = readl((void *)KSEG1ADDR(AR7_REGS_GPIO + 0x1c));
- if (didr2 & (1 << 23))
- return 0;
- if ((rev >= 0x23) && (rev != 0x57))
- return 250000000;
- if ((((didr2 & 0x1fff) << 10) | ((didr1 & 0xffc00000) >> 22))
- > 4208000)
- return 250000000;
- return 0;
-}
-
-static int tnetd7300_get_clock(u32 shift, struct tnetd7300_clock *clock,
- u32 *bootcr, u32 bus_clock)
-{
- int product;
- int base_clock = AR7_REF_CLOCK;
- u32 ctrl = clock->ctrl;
- u32 pll = clock->pll;
- int prediv = ((ctrl & PREDIV_MASK) >> PREDIV_SHIFT) + 1;
- int postdiv = (ctrl & POSTDIV_MASK) + 1;
- int divisor = prediv * postdiv;
- int mul = ((pll & MUL_MASK) >> MUL_SHIFT) + 1;
-
- switch ((*bootcr & (BOOT_PLL_SOURCE_MASK << shift)) >> shift) {
- case BOOT_PLL_SOURCE_BUS:
- base_clock = bus_clock;
- break;
- case BOOT_PLL_SOURCE_REF:
- base_clock = AR7_REF_CLOCK;
- break;
- case BOOT_PLL_SOURCE_XTAL:
- base_clock = AR7_XTAL_CLOCK;
- break;
- case BOOT_PLL_SOURCE_CPU:
- base_clock = ar7_cpu_clock;
- break;
- }
-
- if (*bootcr & BOOT_PLL_BYPASS)
- return base_clock / divisor;
-
- if ((pll & PLL_MODE_MASK) == 0)
- return (base_clock >> (mul / 16 + 1)) / divisor;
-
- if ((pll & (PLL_NDIV | PLL_DIV)) == (PLL_NDIV | PLL_DIV)) {
- product = (mul & 1) ?
- (base_clock * mul) >> 1 :
- (base_clock * (mul - 1)) >> 2;
- return product / divisor;
- }
-
- if (mul == 16)
- return base_clock / divisor;
-
- return base_clock * mul / divisor;
-}
-
-static void tnetd7300_set_clock(u32 shift, struct tnetd7300_clock *clock,
- u32 *bootcr, u32 frequency)
-{
- u32 status;
- int prediv, postdiv, mul;
- int base_clock = ar7_bus_clock;
-
- switch ((*bootcr & (BOOT_PLL_SOURCE_MASK << shift)) >> shift) {
- case BOOT_PLL_SOURCE_BUS:
- base_clock = ar7_bus_clock;
- break;
- case BOOT_PLL_SOURCE_REF:
- base_clock = AR7_REF_CLOCK;
- break;
- case BOOT_PLL_SOURCE_XTAL:
- base_clock = AR7_XTAL_CLOCK;
- break;
- case BOOT_PLL_SOURCE_CPU:
- base_clock = ar7_cpu_clock;
- break;
- }
-
- calculate(base_clock, frequency, &prediv, &postdiv, &mul);
-
- clock->ctrl = ((prediv - 1) << PREDIV_SHIFT) | (postdiv - 1);
- mdelay(1);
- clock->pll = 4;
- do {
- status = clock->pll;
- } while (status & PLL_STATUS);
- clock->pll = ((mul - 1) << MUL_SHIFT) | (0xff << 3) | 0x0e;
- mdelay(75);
-}
-
-static void __init tnetd7300_init_clocks(void)
-{
- u32 *bootcr = (u32 *)ioremap_nocache(AR7_REGS_DCL, 4);
- struct tnetd7300_clocks *clocks = (struct tnetd7300_clocks *)ioremap_nocache(AR7_REGS_POWER + 0x20, sizeof(struct tnetd7300_clocks));
-
- ar7_bus_clock = tnetd7300_get_clock(BUS_PLL_SOURCE_SHIFT,
- &clocks->bus, bootcr, AR7_AFE_CLOCK);
-
- if (*bootcr & BOOT_PLL_ASYNC_MODE) {
- ar7_cpu_clock = tnetd7300_get_clock(CPU_PLL_SOURCE_SHIFT,
- &clocks->cpu, bootcr, AR7_AFE_CLOCK);
- } else {
- ar7_cpu_clock = ar7_bus_clock;
- }
-
- tnetd7300_set_clock(USB_PLL_SOURCE_SHIFT, &clocks->usb,
- bootcr, 48000000);
-
- if (ar7_dsp_clock == 250000000)
- tnetd7300_set_clock(DSP_PLL_SOURCE_SHIFT, &clocks->dsp,
- bootcr, ar7_dsp_clock);
-
- iounmap(clocks);
- iounmap(bootcr);
-}
-
-static int tnetd7200_get_clock(int base, struct tnetd7200_clock *clock,
- u32 *bootcr, u32 bus_clock)
-{
- int divisor = ((clock->prediv & 0x1f) + 1) *
- ((clock->postdiv & 0x1f) + 1);
-
- if (*bootcr & BOOT_PLL_BYPASS)
- return base / divisor;
-
- return base * ((clock->mul & 0xf) + 1) / divisor;
-}
-
-
-static void tnetd7200_set_clock(int base, struct tnetd7200_clock *clock,
- int prediv, int postdiv, int postdiv2, int mul, u32 frequency)
-{
- printk("Clocks: base = %d, frequency = %u, prediv = %d, postdiv = %d, postdiv2 = %d, mul = %d\n",
- base, frequency, prediv, postdiv, postdiv2, mul);
-
- clock->ctrl = 0;
- clock->prediv = DIVISOR_ENABLE_MASK | ((prediv - 1) & 0x1F);
- clock->mul = ((mul - 1) & 0xF);
-
- for(mul = 0; mul < 2000; mul++) /* nop */;
-
- while(clock->status & 0x1) /* nop */;
-
- clock->postdiv = DIVISOR_ENABLE_MASK | ((postdiv - 1) & 0x1F);
-
- clock->cmden |= 1;
- clock->cmd |= 1;
-
- while(clock->status & 0x1) /* nop */;
-
- clock->postdiv2 = DIVISOR_ENABLE_MASK | ((postdiv2 - 1) & 0x1F);
-
- clock->cmden |= 1;
- clock->cmd |= 1;
-
- while(clock->status & 0x1) /* nop */;
-
- clock->ctrl |= 1;
-}
-
-static int tnetd7200_get_clock_base(int clock_id, u32 *bootcr)
-{
- if (*bootcr & BOOT_PLL_ASYNC_MODE) {
- // Async
- switch (clock_id) {
- case TNETD7200_CLOCK_ID_DSP:
- return AR7_REF_CLOCK;
- default:
- return AR7_AFE_CLOCK;
- }
- } else {
- // Sync
- if (*bootcr & BOOT_PLL_2TO1_MODE) {
- // 2:1
- switch (clock_id) {
- case TNETD7200_CLOCK_ID_DSP:
- return AR7_REF_CLOCK;
- default:
- return AR7_AFE_CLOCK;
- }
- } else {
- // 1:1
- return AR7_REF_CLOCK;
- }
- }
-}
-
-
-static void __init tnetd7200_init_clocks(void)
-{
- u32 *bootcr = (u32 *)ioremap_nocache(AR7_REGS_DCL, 4);
- struct tnetd7200_clocks *clocks = (struct tnetd7200_clocks *)ioremap_nocache(AR7_REGS_POWER + 0x80, sizeof(struct tnetd7200_clocks));
- int cpu_base, cpu_mul, cpu_prediv, cpu_postdiv;
- int dsp_base, dsp_mul, dsp_prediv, dsp_postdiv;
- int usb_base, usb_mul, usb_prediv, usb_postdiv;
-
-/*
- Log from Fritz!Box 7170 Annex B:
-
- CPU revision is: 00018448
- Clocks: Async mode
- Clocks: Setting DSP clock
- Clocks: prediv: 1, postdiv: 1, mul: 5
- Clocks: base = 25000000, frequency = 125000000, prediv = 1, postdiv = 2, postdiv2 = 1, mul = 10
- Clocks: Setting CPU clock
- Adjusted requested frequency 211000000 to 211968000
- Clocks: prediv: 1, postdiv: 1, mul: 6
- Clocks: base = 35328000, frequency = 211968000, prediv = 1, postdiv = 1, postdiv2 = -1, mul = 6
- Clocks: Setting USB clock
- Adjusted requested frequency 48000000 to 48076920
- Clocks: prediv: 13, postdiv: 1, mul: 5
- Clocks: base = 125000000, frequency = 48000000, prediv = 13, postdiv = 1, postdiv2 = -1, mul = 5
-
- DSL didn't work if you didn't set the postdiv 2:1 postdiv2 combination, driver hung on startup.
- Haven't tested this on a synchronous board, neither do i know what to do with ar7_dsp_clock
-*/
-
- cpu_base = tnetd7200_get_clock_base(TNETD7200_CLOCK_ID_CPU, bootcr);
- dsp_base = tnetd7200_get_clock_base(TNETD7200_CLOCK_ID_DSP, bootcr);
-
- if (*bootcr & BOOT_PLL_ASYNC_MODE) {
- printk("Clocks: Async mode\n");
-
- printk("Clocks: Setting DSP clock\n");
- calculate(dsp_base, TNETD7200_DEF_DSP_CLK, &dsp_prediv, &dsp_postdiv, &dsp_mul);
- ar7_bus_clock = ((dsp_base / dsp_prediv) * dsp_mul) / dsp_postdiv;
- tnetd7200_set_clock(dsp_base, &clocks->dsp,
- dsp_prediv, dsp_postdiv * 2, dsp_postdiv, dsp_mul * 2,
- ar7_bus_clock);
-
- printk("Clocks: Setting CPU clock\n");
- calculate(cpu_base, TNETD7200_DEF_CPU_CLK, &cpu_prediv, &cpu_postdiv, &cpu_mul);
- ar7_cpu_clock = ((cpu_base / cpu_prediv) * cpu_mul) / cpu_postdiv;
- tnetd7200_set_clock(cpu_base, &clocks->cpu,
- cpu_prediv, cpu_postdiv, -1, cpu_mul,
- ar7_cpu_clock);
-
- } else {
- if (*bootcr & BOOT_PLL_2TO1_MODE) {
- printk("Clocks: Sync 2:1 mode\n");
-
- printk("Clocks: Setting CPU clock\n");
- calculate(cpu_base, TNETD7200_DEF_CPU_CLK, &cpu_prediv, &cpu_postdiv, &cpu_mul);
- ar7_cpu_clock = ((cpu_base / cpu_prediv) * cpu_mul) / cpu_postdiv;
- tnetd7200_set_clock(cpu_base, &clocks->cpu,
- cpu_prediv, cpu_postdiv, -1, cpu_mul,
- ar7_cpu_clock);
-
- printk("Clocks: Setting DSP clock\n");
- calculate(dsp_base, TNETD7200_DEF_DSP_CLK, &dsp_prediv, &dsp_postdiv, &dsp_mul);
- ar7_bus_clock = ar7_cpu_clock / 2;
- tnetd7200_set_clock(dsp_base, &clocks->dsp,
- dsp_prediv, dsp_postdiv * 2, dsp_postdiv, dsp_mul * 2,
- ar7_bus_clock);
- } else {
- printk("Clocks: Sync 1:1 mode\n");
-
- printk("Clocks: Setting DSP clock\n");
- calculate(dsp_base, TNETD7200_DEF_CPU_CLK, &dsp_prediv, &dsp_postdiv, &dsp_mul);
- ar7_bus_clock = ((dsp_base / dsp_prediv) * dsp_mul) / dsp_postdiv;
- tnetd7200_set_clock(dsp_base, &clocks->dsp,
- dsp_prediv, dsp_postdiv * 2, dsp_postdiv, dsp_mul * 2,
- ar7_bus_clock);
-
- ar7_cpu_clock = ar7_bus_clock;
- }
- }
-
- printk("Clocks: Setting USB clock\n");
- usb_base = ar7_bus_clock;
- calculate(usb_base, TNETD7200_DEF_USB_CLK, &usb_prediv, &usb_postdiv, &usb_mul);
- tnetd7200_set_clock(usb_base, &clocks->usb,
- usb_prediv, usb_postdiv, -1, usb_mul,
- TNETD7200_DEF_USB_CLK);
-
- #warning FIXME: ????! Hrmm
- ar7_dsp_clock = ar7_cpu_clock;
-
- iounmap(clocks);
- iounmap(bootcr);
-}
-
-void __init ar7_init_clocks(void)
-{
- switch (ar7_chip_id()) {
- case AR7_CHIP_7100:
-#warning FIXME: Check if the new 7200 clock init works for 7100
- tnetd7200_init_clocks();
- break;
- case AR7_CHIP_7200:
- tnetd7200_init_clocks();
- break;
- case AR7_CHIP_7300:
- ar7_dsp_clock = tnetd7300_dsp_clock();
- tnetd7300_init_clocks();
- break;
- default:
- break;
- }
-}
projects / openwrt.git / blobdiff