diff options
Diffstat (limited to 'src/soc/imgtec/pistachio')
| -rw-r--r-- | src/soc/imgtec/pistachio/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/soc/imgtec/pistachio/clocks.c | 344 | ||||
| -rw-r--r-- | src/soc/imgtec/pistachio/include/soc/clocks.h | 39 |
3 files changed, 384 insertions, 0 deletions
diff --git a/src/soc/imgtec/pistachio/Makefile.inc b/src/soc/imgtec/pistachio/Makefile.inc index fdeba0cc01..6dc18f3b5e 100644 --- a/src/soc/imgtec/pistachio/Makefile.inc +++ b/src/soc/imgtec/pistachio/Makefile.inc @@ -20,6 +20,7 @@ # # We enable CBFS_SPI_WRAPPER for Pistachio targets. +bootblock-y += clocks.c bootblock-y += spi.c romstage-y += spi.c ramstage-y += spi.c diff --git a/src/soc/imgtec/pistachio/clocks.c b/src/soc/imgtec/pistachio/clocks.c new file mode 100644 index 0000000000..ec77d6511d --- /dev/null +++ b/src/soc/imgtec/pistachio/clocks.c @@ -0,0 +1,344 @@ +/* + * 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 <soc/clocks.h> +#include <timer.h> +#include <delay.h> +#include <assert.h> + +/* Definitions for PLL enable */ +#define PISTACHIO_CLOCK_SWITCH 0xB8144200 + +#define SYS_EXTERN_PLL_BYPASS_MASK 0x00002000 +#define SYS_PLL_CTRL4_ADDR 0xB8144048 +#define SYS_INTERNAL_PLL_BYPASS_MASK 0x10000000 +#define SYS_PLL_PD_CTRL_ADDR 0xB8144044 +#define SYS_PLL_PD_CTRL_PD_MASK 0x0000003F + +#define MIPS_EXTERN_PLL_BYPASS_MASK 0x00000002 +#define MIPS_PLL_CTRL2_ADDR 0xB8144008 +#define MIPS_INTERNAL_PLL_BYPASS_MASK 0x10000000 +#define MIPS_PLL_PD_CTRL_ADDR 0xB8144004 +#define MIPS_PLL_PD_CTRL_PD_MASK 0x0F000000 + +/* Definitions for PLL dividers */ +#define SYS_PLL_POSTDIV_ADDR 0xB8144040 +#define SYS_PLL_POSTDIV1_MASK 0x07000000 +#define SYS_PLL_POSTDIV1_SHIFT 24 +#define SYS_PLL_POSTDIV2_MASK 0x38000000 +#define SYS_PLL_POSTDIV2_SHIFT 27 +#define SYS_PLL_STATUS_ADDR 0xB8144038 +#define SYS_PLL_STATUS_LOCK_MASK 0x00000001 + +#define MIPS_PLL_POSTDIV_ADDR 0xB8144004 +#define MIPS_PLL_POSTDIV1_MASK 0x001C0000 +#define MIPS_PLL_POSTDIV1_SHIFT 18 +#define MIPS_PLL_POSTDIV2_MASK 0x00E00000 +#define MIPS_PLL_POSTDIV2_SHIFT 21 +#define MIPS_PLL_STATUS_ADDR 0xB8144000 +#define MIPS_PLL_STATUS_LOCK_MASK 0x00000001 + +#define MIPS_REFDIV_ADDR 0xB8144004 +#define MIPS_REFDIV_MASK 0x0000003F +#define MIPS_REFDIV_SHIFT 0 +#define MIPS_FEEDBACK_ADDR 0xB8144004 +#define MIPS_FEEDBACK_MASK 0x0003FFC0 +#define MIPS_FEEDBACK_SHIFT 6 + +/* Definitions for system clock setup */ +#define SYSCLKINTERNAL_CTRL_ADDR 0xB8144244 +#define SYSCLKINTERNAL_MASK 0X00000007 + +/* Definitions for USB clock setup */ +#define USBPHYCLKOUT_CTRL_ADDR 0xB814422C +#define USBPHYCLKOUT_MASK 0X0000003F +#define USBPHYCONTROL1_ADDR 0xB8149004 +#define USBPHYCONTROL1_FSEL_SHIFT 2 +#define USBPHYCONTROL1_FSEL_MASK 0x1C +#define USBPHYSTRAPCTRL_ADDR 0xB8149010 +#define USBPHYSTRAPCTRL_REFCLKSEL_SHIFT 4 +#define USBPHYSTRAPCTRL_REFCLKSEL_MASK 0x30 +#define USBPHYSTATUS_ADDR 0xB8149014 +#define USBPHYSTATUS_RX_PHY_CLK_MASK 0x200 +#define USBPHYSTATUS_RX_UTMI_CLK_MASK 0x100 +#define USBPHYSTATUS_VBUS_FAULT_MASK 0x80 + +/* Definitions for UART0/1 setup */ +#define UART0CLKINTERNAL_CTRL_ADDR 0xB8144234 +#define UART0CLKINTERNAL_MASK 0x00000007 +#define UART0CLKOUT_CTRL_ADDR 0xB8144238 +#define UART0CLKOUT_MASK 0x000003FF +#define UART1CLKINTERNAL_CTRL_ADDR 0xB814423C +#define UART1CLKINTERNAL_MASK 0x00000007 +#define UART1CLKOUT_CTRL_ADDR 0xB8144240 +#define UART1CLKOUT_MASK 0x000003FF + +/* Definitions for timeout values */ +#define PLL_TIMEOUT_VALUE_US 20000 +#define USB_TIMEOUT_VALUE_US 200000 +#define SYS_CLK_LOCK_DELAY 3 + +struct pll_parameters { + u32 external_bypass_mask; + u32 ctrl_addr; + u32 internal_bypass_mask; + u32 power_down_ctrl_addr; + u32 power_down_ctrl_mask; + u32 postdiv_addr; + u32 postdiv1_shift; + u32 postdiv1_mask; + u32 postdiv2_shift; + u32 postdiv2_mask; + u32 status_addr; + u32 status_lock_mask; + u32 refdivider; + u32 refdiv_addr; + u32 refdiv_shift; + u32 refdiv_mask; + u32 feedback; + u32 feedback_addr; + u32 feedback_shift; + u32 feedback_mask; +}; + +enum plls { + SYS_PLL = 0, + MIPS_PLL = 1 +}; + +static struct pll_parameters pll_params[] = { + [SYS_PLL] = { + .external_bypass_mask = SYS_EXTERN_PLL_BYPASS_MASK, + .ctrl_addr = SYS_PLL_CTRL4_ADDR, + .internal_bypass_mask = SYS_INTERNAL_PLL_BYPASS_MASK, + .power_down_ctrl_addr = SYS_PLL_PD_CTRL_ADDR, + .power_down_ctrl_mask = SYS_PLL_PD_CTRL_PD_MASK, + .postdiv_addr = SYS_PLL_POSTDIV_ADDR, + .postdiv1_shift = SYS_PLL_POSTDIV1_SHIFT, + .postdiv1_mask = SYS_PLL_POSTDIV1_MASK, + .postdiv2_shift = SYS_PLL_POSTDIV2_SHIFT, + .postdiv2_mask = SYS_PLL_POSTDIV2_MASK, + .status_addr = SYS_PLL_STATUS_ADDR, + .status_lock_mask = SYS_PLL_STATUS_LOCK_MASK, + .refdivider = 0, /* Not defined yet */ + .refdiv_addr = 0, /* Not necessary */ + .refdiv_shift = 0, /* Not necessary */ + .refdiv_mask = 0, /* Not necessary */ + .feedback = 0, /* Not necessary */ + .feedback_addr = 0, /* Not necessary */ + .feedback_shift = 0, /* Not necessary */ + .feedback_mask = 0, /* Not necessary */ + }, + + [MIPS_PLL] = { + .external_bypass_mask = MIPS_EXTERN_PLL_BYPASS_MASK, + .ctrl_addr = MIPS_PLL_CTRL2_ADDR, + .internal_bypass_mask = MIPS_INTERNAL_PLL_BYPASS_MASK, + .power_down_ctrl_addr = MIPS_PLL_PD_CTRL_ADDR, + .power_down_ctrl_mask = MIPS_PLL_PD_CTRL_PD_MASK, + .postdiv_addr = MIPS_PLL_POSTDIV_ADDR, + .postdiv1_shift = MIPS_PLL_POSTDIV1_SHIFT, + .postdiv1_mask = MIPS_PLL_POSTDIV1_MASK, + .postdiv2_shift = MIPS_PLL_POSTDIV2_SHIFT, + .postdiv2_mask = MIPS_PLL_POSTDIV2_MASK, + .status_addr = MIPS_PLL_STATUS_ADDR, + .status_lock_mask = MIPS_PLL_STATUS_LOCK_MASK, + .refdivider = 0, /* Not defined yet */ + .refdiv_addr = MIPS_REFDIV_ADDR, + .refdiv_shift = MIPS_REFDIV_SHIFT, + .refdiv_mask = MIPS_REFDIV_MASK, + .feedback = 0, /* Not defined yet */ + .feedback_addr = MIPS_FEEDBACK_ADDR, + .feedback_shift = MIPS_FEEDBACK_SHIFT, + .feedback_mask = MIPS_FEEDBACK_MASK + } +}; + +static int pll_setup(struct pll_parameters *param, u8 divider1, u8 divider2) +{ + u32 reg; + struct stopwatch sw; + + /* Check input parameters */ + assert(!(divider1 & ~(param->postdiv1_mask))); + assert(!(divider2 & ~(param->postdiv2_mask))); + + /* Temporary bypass PLL (select XTAL as clock input) */ + reg = read32(PISTACHIO_CLOCK_SWITCH); + reg &= ~(param->external_bypass_mask); + write32(PISTACHIO_CLOCK_SWITCH, reg); + + /* Un-bypass PLL's internal bypass */ + reg = read32(param->ctrl_addr); + reg &= ~(param->internal_bypass_mask); + write32(param->ctrl_addr, reg); + + /* Disable power down */ + reg = read32(param->power_down_ctrl_addr); + reg &= ~(param->power_down_ctrl_mask); + write32(param->power_down_ctrl_addr, reg); + + if (param->feedback_addr) { + assert(!(param->feedback & ~(param->feedback_mask))); + reg = read32(param->feedback_addr); + reg &= ~(param->feedback_mask); + reg |= (param->feedback << param->feedback_shift) & + param->feedback_mask; + write32(param->feedback_addr, reg); + } + + if (param->refdiv_addr) { + assert(!(param->refdivider & ~(param->refdiv_mask))); + reg = read32(param->refdiv_addr); + reg &= ~(param->refdiv_mask); + reg |= (param->refdivider << param->refdiv_shift) & + param->refdiv_mask; + write32(param->refdiv_addr, reg); + } + + /* Read postdivider register value */ + reg = read32(param->postdiv_addr); + /* Set divider 1 */ + reg &= ~(param->postdiv1_mask); + reg |= (divider1 << param->postdiv1_shift) & + param->postdiv1_mask; + /* Set divider 2 */ + reg &= ~(param->postdiv2_mask); + reg |= (divider2 << param->postdiv2_shift) & + param->postdiv2_mask; + /* Write back to register */ + write32(param->postdiv_addr, reg); + + /* Waiting for PLL to lock*/ + stopwatch_init_usecs_expire(&sw, PLL_TIMEOUT_VALUE_US); + while (!(read32(param->status_addr) & param->status_lock_mask)) { + if (stopwatch_expired(&sw)) + return PLL_TIMEOUT; + } + + /* Start using PLL */ + reg = read32(PISTACHIO_CLOCK_SWITCH); + reg |= param->external_bypass_mask; + write32(PISTACHIO_CLOCK_SWITCH, reg); + + return CLOCKS_OK; +} + +int sys_pll_setup(u8 divider1, u8 divider2) +{ + return pll_setup(&(pll_params[SYS_PLL]), divider1, divider2); +} + +int mips_pll_setup(u8 divider1, u8 divider2, u8 refdivider, u32 feedback) +{ + pll_params[MIPS_PLL].refdivider = refdivider; + pll_params[MIPS_PLL].feedback = feedback; + return pll_setup(&(pll_params[MIPS_PLL]), divider1, divider2); +} + +/* + * uart1_clk_setup: sets up clocks for UART1 + * divider1: 3-bit divider value + * divider2: 10-bit divider value + */ +void uart1_clk_setup(u8 divider1, u16 divider2) +{ + u32 reg; + + /* Check input parameters */ + assert(!(divider1 & ~(UART1CLKINTERNAL_MASK))); + assert(!(divider2 & ~(UART1CLKOUT_MASK))); + + /* Set divider 1 */ + reg = read32(UART1CLKINTERNAL_CTRL_ADDR); + reg &= ~UART1CLKINTERNAL_MASK; + reg |= divider1 & UART1CLKINTERNAL_MASK; + write32(UART1CLKINTERNAL_CTRL_ADDR, reg); + + /* Set divider 2 */ + reg = read32(UART1CLKOUT_CTRL_ADDR); + reg &= ~UART1CLKOUT_MASK; + reg |= divider2 & UART1CLKOUT_MASK; + write32(UART1CLKOUT_CTRL_ADDR, reg); +} + +/* system_clk_setup: sets up the system (peripheral) clock */ +void system_clk_setup(u8 divider) +{ + u32 reg; + + /* Check input parameters */ + assert(!(divider & ~(SYSCLKINTERNAL_MASK))); + + /* Set system clock divider */ + reg = read32(SYSCLKINTERNAL_CTRL_ADDR); + reg &= ~SYSCLKINTERNAL_MASK; + reg |= divider & SYSCLKINTERNAL_MASK; + write32(SYSCLKINTERNAL_CTRL_ADDR, reg); + + /* Small delay to cover a maximum lock time of 1500 cycles */ + udelay(SYS_CLK_LOCK_DELAY); +} + +/* usb_clk_setup: sets up USB clock */ +int usb_clk_setup(u8 divider, u8 refclksel, u8 fsel) +{ + u32 reg; + struct stopwatch sw; + + /* Check input parameters */ + assert(!(divider & ~(USBPHYCLKOUT_MASK))); + assert(!(refclksel & ~(USBPHYSTRAPCTRL_REFCLKSEL_MASK))); + assert(!(fsel & ~(USBPHYCONTROL1_FSEL_MASK))); + + /* Set USB divider */ + reg = read32(USBPHYCLKOUT_CTRL_ADDR); + reg &= ~USBPHYCLKOUT_MASK; + reg |= divider & USBPHYCLKOUT_MASK; + write32(USBPHYCLKOUT_CTRL_ADDR, reg); + + /* Set REFCLKSEL */ + reg = read32(USBPHYSTRAPCTRL_ADDR); + reg &= ~USBPHYSTRAPCTRL_REFCLKSEL_MASK; + reg |= (refclksel << USBPHYSTRAPCTRL_REFCLKSEL_SHIFT) & + USBPHYSTRAPCTRL_REFCLKSEL_MASK; + write32(USBPHYSTRAPCTRL_ADDR, reg); + + /* Set FSEL */ + reg = read32(USBPHYCONTROL1_ADDR); + reg &= ~USBPHYCONTROL1_FSEL_MASK; + reg |= (fsel << USBPHYCONTROL1_FSEL_SHIFT) & + USBPHYCONTROL1_FSEL_MASK; + write32(USBPHYCONTROL1_ADDR, reg); + + /* Waiting for USB clock status */ + stopwatch_init_usecs_expire(&sw, USB_TIMEOUT_VALUE_US); + while (1) { + reg = read32(USBPHYSTATUS_ADDR); + if (reg & USBPHYSTATUS_VBUS_FAULT_MASK) + return USB_VBUS_FAULT; + if (stopwatch_expired(&sw)) + return USB_TIMEOUT; + } + + return CLOCKS_OK; +} diff --git a/src/soc/imgtec/pistachio/include/soc/clocks.h b/src/soc/imgtec/pistachio/include/soc/clocks.h new file mode 100644 index 0000000000..95b35857a5 --- /dev/null +++ b/src/soc/imgtec/pistachio/include/soc/clocks.h @@ -0,0 +1,39 @@ +/* + * 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. + * + */ + +#ifndef __SOC_IMGTEC_PISTACHIO_CLOCKS_H__ +#define __SOC_IMGTEC_PISTACHIO_CLOCKS_H__ + +#include <stdint.h> + +/* Functions for PLL setting */ +int sys_pll_setup(u8 divider1, u8 divider2); +int mips_pll_setup(u8 divider1, u8 divider2i, u8 predivider, u32 feedback); + +/* Peripheral divider setting */ +void uart1_clk_setup(u8 divider1, u16 divider2); +void system_clk_setup(u8 divider); +int usb_clk_setup(u8 divider, u8 refclksel, u8 fsel); + +enum { + CLOCKS_OK = 0, + PLL_TIMEOUT = -1, + USB_TIMEOUT = -2, + USB_VBUS_FAULT = -3 +}; + +#endif |