MIPS: Add support for Texas Instruments AR7 System-on-a-Chip (7ca5dc14) · Commits · e / devices / android_kernel_fairphone_FP5

arch/mips/Kconfig

+20 −0

Original line number	Diff line number	Diff line
		@@ -22,6 +22,26 @@ choice
		config MACH_ALCHEMY
		bool "Alchemy processor based machines"

		config AR7
		bool "Texas Instruments AR7"
		select BOOT_ELF32
		select DMA_NONCOHERENT
		select CEVT_R4K
		select CSRC_R4K
		select IRQ_CPU
		select NO_EXCEPT_FILL
		select SWAP_IO_SPACE
		select SYS_HAS_CPU_MIPS32_R1
		select SYS_HAS_EARLY_PRINTK
		select SYS_SUPPORTS_32BIT_KERNEL
		select SYS_SUPPORTS_LITTLE_ENDIAN
		select GENERIC_GPIO
		select GCD
		select VLYNQ
		help
		Support for the Texas Instruments AR7 System-on-a-Chip
		family: TNETD7100, 7200 and 7300.

		config BASLER_EXCITE
		bool "Basler eXcite smart camera"
		select CEVT_R4K

arch/mips/Makefile

+7 −0

Original line number	Diff line number	Diff line
		@@ -172,6 +172,13 @@ libs-y += arch/mips/fw/lib/
		# Board-dependent options and extra files
		#

		#
		# Texas Instruments AR7
		#
		core-$(CONFIG_AR7) += arch/mips/ar7/
		cflags-$(CONFIG_AR7) += -I$(srctree)/arch/mips/include/asm/mach-ar7
		load-$(CONFIG_AR7) += 0xffffffff94100000

		#
		# Acer PICA 61, Mips Magnum 4000 and Olivetti M700.
		#

arch/mips/ar7/Makefile

0 → 100644

+10 −0

Original line number	Diff line number	Diff line

		obj-y := \
		prom.o \
		setup.o \
		memory.o \
		irq.o \
		time.o \
		platform.o \
		gpio.o \
		clock.o

arch/mips/ar7/clock.c

0 → 100644

+440 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
		* Copyright (C) 2007 Eugene Konev <ejka@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/kernel.h>
		#include <linux/init.h>
		#include <linux/types.h>
		#include <linux/module.h>
		#include <linux/delay.h>
		#include <linux/gcd.h>
		#include <linux/io.h>

		#include <asm/addrspace.h>
		#include <asm/mach-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 {
		u32 ctrl;
		#define PREDIV_MASK 0x001f0000
		#define PREDIV_SHIFT 16
		#define POSTDIV_MASK 0x0000001f
		u32 unused1[3];
		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];
		};

		struct tnetd7300_clocks {
		struct tnetd7300_clock bus;
		struct tnetd7300_clock cpu;
		struct tnetd7300_clock usb;
		struct tnetd7300_clock dsp;
		};

		struct tnetd7200_clock {
		u32 ctrl;
		u32 unused1[3];
		#define DIVISOR_ENABLE_MASK 0x00008000
		u32 mul;
		u32 prediv;
		u32 postdiv;
		u32 postdiv2;
		u32 unused2[6];
		u32 cmd;
		u32 status;
		u32 cmden;
		u32 padding[15];
		};

		struct tnetd7200_clocks {
		struct tnetd7200_clock cpu;
		struct tnetd7200_clock dsp;
		struct tnetd7200_clock usb;
		};

		int ar7_cpu_clock = 150000000;
		EXPORT_SYMBOL(ar7_cpu_clock);
		int ar7_bus_clock = 125000000;
		EXPORT_SYMBOL(ar7_bus_clock);
		int ar7_dsp_clock;
		EXPORT_SYMBOL(ar7_dsp_clock);

		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 = readl(&clock->ctrl);
		u32 pll = readl(&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)
		{
		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);

		writel(((prediv - 1) << PREDIV_SHIFT) \| (postdiv - 1), &clock->ctrl);
		msleep(1);
		writel(4, &clock->pll);
		while (readl(&clock->pll) & PLL_STATUS)
		;
		writel(((mul - 1) << MUL_SHIFT) \| (0xff << 3) \| 0x0e, &clock->pll);
		msleep(75);
		}

		static void __init tnetd7300_init_clocks(void)
		{
		u32 bootcr = (u32 )ioremap_nocache(AR7_REGS_DCL, 4);
		struct tnetd7300_clocks *clocks =
		ioremap_nocache(UR8_REGS_CLOCKS,
		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;

		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 = ((readl(&clock->prediv) & 0x1f) + 1) *
		((readl(&clock->postdiv) & 0x1f) + 1);

		if (*bootcr & BOOT_PLL_BYPASS)
		return base / divisor;

		return base * ((readl(&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(KERN_INFO
		"Clocks: base = %d, frequency = %u, prediv = %d, "
		"postdiv = %d, postdiv2 = %d, mul = %d\n",
		base, frequency, prediv, postdiv, postdiv2, mul);

		writel(0, &clock->ctrl);
		writel(DIVISOR_ENABLE_MASK \| ((prediv - 1) & 0x1F), &clock->prediv);
		writel((mul - 1) & 0xF, &clock->mul);

		while (readl(&clock->status) & 0x1)
		; /* nop */

		writel(DIVISOR_ENABLE_MASK \| ((postdiv - 1) & 0x1F), &clock->postdiv);

		writel(readl(&clock->cmden) \| 1, &clock->cmden);
		writel(readl(&clock->cmd) \| 1, &clock->cmd);

		while (readl(&clock->status) & 0x1)
		; /* nop */

		writel(DIVISOR_ENABLE_MASK \| ((postdiv2 - 1) & 0x1F), &clock->postdiv2);

		writel(readl(&clock->cmden) \| 1, &clock->cmden);
		writel(readl(&clock->cmd) \| 1, &clock->cmd);

		while (readl(&clock->status) & 0x1)
		; /* nop */

		writel(readl(&clock->ctrl) \| 1, &clock->ctrl);
		}

		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 =
		ioremap_nocache(AR7_REGS_CLOCKS,
		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;

		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(KERN_INFO "Clocks: Async mode\n");

		printk(KERN_INFO "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(KERN_INFO "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(KERN_INFO "Clocks: Sync 2:1 mode\n");

		printk(KERN_INFO "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(KERN_INFO "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(KERN_INFO "Clocks: Sync 1:1 mode\n");

		printk(KERN_INFO "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);

		ar7_cpu_clock = ar7_bus_clock;
		}

		printk(KERN_INFO "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);

		ar7_dsp_clock = ar7_cpu_clock;

		iounmap(clocks);
		iounmap(bootcr);
		}

		int __init ar7_init_clocks(void)
		{
		switch (ar7_chip_id()) {
		case AR7_CHIP_7100:
		case AR7_CHIP_7200:
		tnetd7200_init_clocks();
		break;
		case AR7_CHIP_7300:
		ar7_dsp_clock = tnetd7300_dsp_clock();
		tnetd7300_init_clocks();
		break;
		default:
		break;
		}

		return 0;
		}
		arch_initcall(ar7_init_clocks);

arch/mips/ar7/gpio.c

0 → 100644

+48 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
		* Copyright (C) 2007 Eugene Konev <ejka@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/module.h>

		#include <asm/mach-ar7/gpio.h>

		static const char *ar7_gpio_list[AR7_GPIO_MAX];

		int gpio_request(unsigned gpio, const char *label)
		{
		if (gpio >= AR7_GPIO_MAX)
		return -EINVAL;

		if (ar7_gpio_list[gpio])
		return -EBUSY;

		if (label)
		ar7_gpio_list[gpio] = label;
		else
		ar7_gpio_list[gpio] = "busy";

		return 0;
		}
		EXPORT_SYMBOL(gpio_request);

		void gpio_free(unsigned gpio)
		{
		BUG_ON(!ar7_gpio_list[gpio]);
		ar7_gpio_list[gpio] = NULL;
		}
		EXPORT_SYMBOL(gpio_free);