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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Imagination Technologies
*
* 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; version 2 of
* the License.
*
* 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 <arch/io.h>
#include <stdint.h>
#include <soc/clocks.h>
#include <assert.h>
#define PADS_FUNCTION_SELECT0_ADDR (0xB8101C00 + 0xC0)
#define GPIO_BIT_EN_ADDR(bank) (0xB8101C00 + 0x200 + (0x24 * (bank)))
#define PAD_DRIVE_STRENGTH_ADDR(bank) (0xB8101C00 + 0x120 + (0x4 * (bank)))
#define MAX_NO_MFIOS 89
#define PAD_DRIVE_STRENGTH_LENGTH 2
#define PAD_DRIVE_STRENGTH_MASK 0x3
typedef enum {
DRIVE_STRENGTH_2mA = 0,
DRIVE_STRENGTH_4mA = 1,
DRIVE_STRENGTH_8mA = 2,
DRIVE_STRENGTH_12mA = 3
} drive_strength;
/* MFIO definitions for UART1 */
#define UART1_RXD_MFIO 59
#define UART1_TXD_MFIO 60
/* MFIO definitions for SPIM */
#define SPIM1_D0_TXD_MFIO 5
#define SPIM1_D1_RXD_MFIO 4
#define SPIM1_MCLK_MFIO 3
#define SPIM1_D2_MFIO 6
#define SPIM1_D3_MFIO 7
#define SPIM1_CS0_MFIO 0
/* MFIO definitions for I2C */
#define I2C_DATA_MFIO(i) (28 + (2*(i)))
#define I2C_CLK_MFIO(i) (29 + (2*(i)))
#define I2C_DATA_FUNCTION_OFFSET(i) (20 + (2*(i)))
#define I2C_CLK_FUNCTION_OFFSET(i) (21 + (2*(i)))
#define I2C_DATA_FUNCTION_MASK 0x1
#define I2C_CLK_FUNCTION_MASK 0x1
static void pad_drive_strength(u32 pad, drive_strength strength)
{
u32 reg, drive_strength_shift;
assert(pad <= MAX_NO_MFIOS);
assert(!(strength & ~(PAD_DRIVE_STRENGTH_MASK)));
/* Set drive strength value */
drive_strength_shift = (pad % 16) * PAD_DRIVE_STRENGTH_LENGTH;
reg = read32(PAD_DRIVE_STRENGTH_ADDR(pad / 16));
reg &= ~(PAD_DRIVE_STRENGTH_MASK << drive_strength_shift);
reg |= strength << drive_strength_shift;
write32(PAD_DRIVE_STRENGTH_ADDR(pad / 16), reg);
}
static void uart1_mfio_setup(void)
{
u32 reg, mfio_mask;
/*
* Disable GPIO for UART1 MFIOs
* All UART MFIOs have MFIO/16 = 3, therefore we use GPIO pad 3
* This is the only function (0) of these MFIOs and therfore there
* is no need to set up a function number in the corresponding
* function select register.
*/
reg = read32(GPIO_BIT_EN_ADDR(3));
mfio_mask = 1 << (UART1_RXD_MFIO % 16);
mfio_mask |= 1 << (UART1_TXD_MFIO % 16);
/* Clear relevant bits */
reg &= ~mfio_mask;
/*
* Set corresponding bits in the upper half word
* in order to be able to modify the chosen pins
*/
reg |= mfio_mask << 16;
write32(GPIO_BIT_EN_ADDR(3), reg);
}
static void spim1_mfio_setup(void)
{
u32 reg, mfio_mask;
/*
* Disable GPIO for SPIM1 MFIOs
* All SPFI1 MFIOs have MFIO/16 = 0, therefore we use GPIO pad 0
* This is the only function (0) of these MFIOs and therfore there
* is no need to set up a function number in the corresponding
* function select register.
*/
reg = read32(GPIO_BIT_EN_ADDR(0));
/* Disable GPIO for SPIM1 MFIOs */
mfio_mask = 1 << (SPIM1_D0_TXD_MFIO % 16);
mfio_mask |= 1 << (SPIM1_D1_RXD_MFIO % 16);
mfio_mask |= 1 << (SPIM1_MCLK_MFIO % 16);
mfio_mask |= 1 << (SPIM1_D2_MFIO % 16);
mfio_mask |= 1 << (SPIM1_D3_MFIO % 16);
mfio_mask |= 1 << (SPIM1_CS0_MFIO % 16);
/* Clear relevant bits */
reg &= ~mfio_mask;
/*
* Set corresponding bits in the upper half word
* in order to be able to modify the chosen pins
*/
reg |= mfio_mask << 16;
write32(GPIO_BIT_EN_ADDR(0), reg);
/* Set drive strength to maximum for these MFIOs */
pad_drive_strength(SPIM1_CS0_MFIO, DRIVE_STRENGTH_12mA);
pad_drive_strength(SPIM1_D1_RXD_MFIO, DRIVE_STRENGTH_12mA);
pad_drive_strength(SPIM1_D0_TXD_MFIO, DRIVE_STRENGTH_12mA);
pad_drive_strength(SPIM1_D2_MFIO, DRIVE_STRENGTH_12mA);
pad_drive_strength(SPIM1_D3_MFIO, DRIVE_STRENGTH_12mA);
pad_drive_strength(SPIM1_MCLK_MFIO, DRIVE_STRENGTH_12mA);
}
static void i2c_mfio_setup(int interface)
{
u32 reg, mfio_mask;
assert(interface < 4);
/*
* Disable GPIO for I2C MFIOs
*/
reg = read32(GPIO_BIT_EN_ADDR(I2C_DATA_MFIO(interface) / 16));
mfio_mask = 1 << (I2C_DATA_MFIO(interface) % 16);
mfio_mask |= 1 << (I2C_CLK_MFIO(interface) % 16);
/* Clear relevant bits */
reg &= ~mfio_mask;
/*
* Set corresponding bits in the upper half word
* in order to be able to modify the chosen pins
*/
reg |= mfio_mask << 16;
write32(GPIO_BIT_EN_ADDR(I2C_DATA_MFIO(interface) / 16), reg);
/* for I2C0 and I2C1:
* Set bits to 0 (clear) which is the primary function
* for these MFIOs; those bits will all be set to 1 by
* default.
* There is no need to do that for I2C2 and I2C3
*/
if (interface > 1)
return;
reg = read32(PADS_FUNCTION_SELECT0_ADDR);
reg &= ~(I2C_DATA_FUNCTION_MASK <<
I2C_DATA_FUNCTION_OFFSET(interface));
reg &= ~(I2C_CLK_FUNCTION_MASK <<
I2C_CLK_FUNCTION_OFFSET(interface));
write32(PADS_FUNCTION_SELECT0_ADDR, reg);
}
static int init_clocks(void)
{
int ret;
/*
* Set up dividers for peripherals before setting up PLLs
* in order to not over-clock them when enabling PLLs
*/
/* System PLL divided by 2 -> 400 MHz */
/* The same frequency will be the input frequency for the SPFI block */
system_clk_setup(1);
/* MIPS CPU dividers: division by 1 -> 546 MHz
* This is set up as we cannot make any assumption about
* the values set or not by the boot ROM code */
mips_clk_setup(0, 0);
/* System clock divided by 8 -> 50 MHz */
ret = usb_clk_setup(7, 2, 7);
if (ret != CLOCKS_OK)
return ret;
/* System PLL divided by 7 divided by 62 -> 1.8433 Mhz */
uart1_clk_setup(6, 61);
/* System PLL divided by 4 divided by 3 -> 33.33 MHz */
i2c_clk_setup(3, 2, 0);
/* Ethernet clocks setup: ENET as clock source */
eth_clk_setup(0, 7);
/* ROM clock setup: system clock divided by 2 -> 200 MHz */
/* Hash accelerator is driven from the ROM clock */
rom_clk_setup(1);
/* Setup system PLL at 800 MHz */
ret = sys_pll_setup(2, 1);
if (ret != CLOCKS_OK)
return ret;
/* Setup MIPS PLL at 546 MHz */
ret = mips_pll_setup(2, 1, 1, 21);
if (ret != CLOCKS_OK)
return ret;
return CLOCKS_OK;
}
static void bootblock_mainboard_init(void)
{
if (!init_clocks()) {
/* Disable GPIO on the peripheral lines */
uart1_mfio_setup();
spim1_mfio_setup();
i2c_mfio_setup(0);
}
}
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