For use by future at91 first stage bootloaders, this commit imports https://github.com/linux4sam/at91bootstrap/blob/v3.8.12/driver/pmc.c Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx> --- arch/arm/mach-at91/Makefile | 1 + arch/arm/mach-at91/at91_pmc_ll.c | 184 ++++++++++++++++++ arch/arm/mach-at91/include/mach/at91_pmc.h | 24 ++- arch/arm/mach-at91/include/mach/at91_pmc_ll.h | 78 ++++++++ 4 files changed, 284 insertions(+), 3 deletions(-) create mode 100644 arch/arm/mach-at91/at91_pmc_ll.c create mode 100644 arch/arm/mach-at91/include/mach/at91_pmc_ll.h diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile index d81683ac121a..91b06c085107 100644 --- a/arch/arm/mach-at91/Makefile +++ b/arch/arm/mach-at91/Makefile @@ -1,4 +1,5 @@ obj-y += setup.o +pbl-y += at91_pmc_ll.o ifeq ($(CONFIG_COMMON_CLK_OF_PROVIDER),) obj-y += clock.o diff --git a/arch/arm/mach-at91/at91_pmc_ll.c b/arch/arm/mach-at91/at91_pmc_ll.c new file mode 100644 index 000000000000..bb3b3e6cf970 --- /dev/null +++ b/arch/arm/mach-at91/at91_pmc_ll.c @@ -0,0 +1,184 @@ +// SPDX-License-Identifier: BSD-1-Clause +/* + * Copyright (c) 2006, Atmel Corporation + */ + +#include <common.h> +#include <mach/at91_pmc_ll.h> + +#define at91_pmc_write(off, val) writel(val, pmc_base + off) +#define at91_pmc_read(off) readl(pmc_base + off) + +void at91_pmc_init(void __iomem *pmc_base, unsigned int flags) +{ + u32 tmp; + + /* + * Switch the master clock to the slow clock without modifying other + * parameters. It is assumed that ROM code set H32MXDIV, PLLADIV2, + * PCK_DIV3. + */ + tmp = at91_pmc_read(AT91_PMC_MCKR); + tmp &= ~AT91_PMC_ALT_PCKR_CSS; + tmp |= AT91_PMC_CSS_SLOW; + at91_pmc_write(AT91_PMC_MCKR, tmp); + + while (!(at91_pmc_read(AT91_PMC_SR) & AT91_PMC_MCKRDY)) + ; + + if (flags & AT91_PMC_LL_FLAG_SAM9X5_PMC) { + /* + * Enable the Main Crystal Oscillator + * tST_max = 2ms + * Startup Time: 32768 * 2ms / 8 = 8 + */ + tmp = at91_pmc_read(AT91_CKGR_MOR); + tmp &= ~AT91_PMC_OSCOUNT; + tmp &= ~AT91_PMC_KEY_MASK; + tmp |= AT91_PMC_MOSCEN; + tmp |= AT91_PMC_OSCOUNT_(8); + tmp |= AT91_PMC_KEY; + at91_pmc_write(AT91_CKGR_MOR, tmp); + + while (!(at91_pmc_read(AT91_PMC_SR) & AT91_PMC_MOSCS)) + ; + + if (flags & AT91_PMC_LL_FLAG_MEASURE_XTAL) { + /* Enable a measurement of the Main Crystal Oscillator */ + tmp = at91_pmc_read(AT91_CKGR_MCFR); + tmp |= AT91_PMC_CCSS_XTAL_OSC; + tmp |= AT91_PMC_RCMEAS; + at91_pmc_write(AT91_CKGR_MCFR, tmp); + + while (!(at91_pmc_read(AT91_CKGR_MCFR) & AT91_PMC_MAINRDY)) + ; + } + + + /* Switch from internal 12MHz RC to the Main Crystal Oscillator */ + tmp = at91_pmc_read(AT91_CKGR_MOR); + tmp &= ~AT91_PMC_OSCBYPASS; + tmp &= ~AT91_PMC_KEY_MASK; + tmp |= AT91_PMC_KEY; + at91_pmc_write(AT91_CKGR_MOR, tmp); + + tmp = at91_pmc_read(AT91_CKGR_MOR); + tmp |= AT91_PMC_MOSCSEL; + tmp &= ~AT91_PMC_KEY_MASK; + tmp |= AT91_PMC_KEY; + at91_pmc_write(AT91_CKGR_MOR, tmp); + + while (!(at91_pmc_read(AT91_PMC_SR) & AT91_PMC_MOSCSELS)) + ; + + if (flags & AT91_PMC_LL_FLAG_DISABLE_RC) { + /* Disable the 12MHz RC Oscillator */ + tmp = at91_pmc_read(AT91_CKGR_MOR); + tmp &= ~AT91_PMC_MOSCRCEN; + tmp &= ~AT91_PMC_KEY_MASK; + tmp |= AT91_PMC_KEY; + at91_pmc_write(AT91_CKGR_MOR, tmp); + } + + } else { + /* + * Enable the Main Crystal Oscillator + * tST_max = 2ms + * Startup Time: 32768 * 2ms / 8 = 8 + */ + tmp = at91_pmc_read(AT91_CKGR_MOR); + tmp &= ~AT91_PMC_OSCOUNT; + tmp |= AT91_PMC_MOSCEN; + tmp |= AT91_PMC_OSCOUNT_(8); + at91_pmc_write(AT91_CKGR_MOR, tmp); + + while (!(at91_pmc_read(AT91_PMC_SR) & AT91_PMC_MOSCS)) + ; + } + + /* After stablization, switch to Main Clock */ + if ((at91_pmc_read(AT91_PMC_MCKR) & AT91_PMC_ALT_PCKR_CSS) == AT91_PMC_CSS_SLOW) { + tmp = at91_pmc_read(AT91_PMC_MCKR); + tmp &= ~(0x1 << 13); + tmp &= ~AT91_PMC_ALT_PCKR_CSS; + tmp |= AT91_PMC_CSS_MAIN; + at91_pmc_write(AT91_PMC_MCKR, tmp); + + while (!(at91_pmc_read(AT91_PMC_SR) & AT91_PMC_MCKRDY)) + ; + + tmp &= ~AT91_PMC_PRES; + tmp |= AT91_PMC_PRES_1; + at91_pmc_write(AT91_PMC_MCKR, tmp); + + while (!(at91_pmc_read(AT91_PMC_SR) & AT91_PMC_MCKRDY)) + ; + } +} + +void at91_pmc_cfg_plla(void __iomem *pmc_base, u32 pmc_pllar, + unsigned int __always_unused flags) +{ + /* Always disable PLL before configuring it */ + at91_pmc_write(AT91_CKGR_PLLAR, AT91_PMC_PLLA_WR_ERRATA); + at91_pmc_write(AT91_CKGR_PLLAR, AT91_PMC_PLLA_WR_ERRATA | pmc_pllar); + + while (!(at91_pmc_read(AT91_PMC_SR) & AT91_PMC_LOCKA)) + ; +} + +void at91_pmc_cfg_mck(void __iomem *pmc_base, u32 pmc_mckr, unsigned int flags) +{ + u32 tmp; + + /* + * Program the PRES field in the AT91_PMC_MCKR register + */ + tmp = at91_pmc_read(AT91_PMC_MCKR); + tmp &= ~(0x1 << 13); + + if (flags & AT91_PMC_LL_FLAG_SAM9X5_PMC) { + tmp &= ~AT91_PMC_ALT_PRES; + tmp |= pmc_mckr & AT91_PMC_ALT_PRES; + } else { + tmp &= ~AT91_PMC_PRES; + tmp |= pmc_mckr & AT91_PMC_PRES; + } + at91_pmc_write(AT91_PMC_MCKR, tmp); + + /* + * Program the MDIV field in the AT91_PMC_MCKR register + */ + tmp = at91_pmc_read(AT91_PMC_MCKR); + tmp &= ~AT91_PMC_MDIV; + tmp |= pmc_mckr & AT91_PMC_MDIV; + at91_pmc_write(AT91_PMC_MCKR, tmp); + + /* + * Program the PLLADIV2 field in the AT91_PMC_MCKR register + */ + tmp = at91_pmc_read(AT91_PMC_MCKR); + tmp &= ~AT91_PMC_PLLADIV2; + tmp |= pmc_mckr & AT91_PMC_PLLADIV2; + at91_pmc_write(AT91_PMC_MCKR, tmp); + + /* + * Program the H32MXDIV field in the AT91_PMC_MCKR register + */ + tmp = at91_pmc_read(AT91_PMC_MCKR); + tmp &= ~AT91_PMC_H32MXDIV; + tmp |= pmc_mckr & AT91_PMC_H32MXDIV; + at91_pmc_write(AT91_PMC_MCKR, tmp); + + /* + * Program the CSS field in the AT91_PMC_MCKR register, + * wait for MCKRDY bit to be set in the PMC_SR register + */ + tmp = at91_pmc_read(AT91_PMC_MCKR); + tmp &= ~AT91_PMC_ALT_PCKR_CSS; + tmp |= pmc_mckr & AT91_PMC_ALT_PCKR_CSS; + at91_pmc_write(AT91_PMC_MCKR, tmp); + + while (!(at91_pmc_read(AT91_PMC_SR) & AT91_PMC_MCKRDY)) + ; +} diff --git a/arch/arm/mach-at91/include/mach/at91_pmc.h b/arch/arm/mach-at91/include/mach/at91_pmc.h index bbbd497afaed..4d60becefbab 100644 --- a/arch/arm/mach-at91/include/mach/at91_pmc.h +++ b/arch/arm/mach-at91/include/mach/at91_pmc.h @@ -50,14 +50,19 @@ #define AT91_PMC_OSCBYPASS (1 << 1) /* Oscillator Bypass */ #define AT91_PMC_MOSCRCEN (1 << 3) /* Main On-Chip RC Oscillator Enable [some SAM9] */ #define AT91_PMC_OSCOUNT (0xff << 8) /* Main Oscillator Start-up Time */ -#define AT91_PMC_KEY (0x37 << 16) /* MOR Writing Key */ +#define AT91_PMC_OSCOUNT_(x) ((x) << 8) +#define AT91_PMC_KEY_MASK (0xff << 16) /* MOR Writing Key */ +#define AT91_PMC_KEY (0x37 << 16) #define AT91_PMC_MOSCSEL (1 << 24) /* Main Oscillator Selection [some SAM9] */ #define AT91_PMC_CFDEN (1 << 25) /* Clock Failure Detector Enable [some SAM9] */ #define AT91_CKGR_MCFR 0x24 /* Main Clock Frequency Register */ #define AT91_PMC_MAINF (0xffff << 0) /* Main Clock Frequency */ -#define AT91_PMC_MAINRDY (1 << 16) /* Main Clock Ready */ - +#define AT91_PMC_MAINRDY (1 << 16) /* Main Clock Frequency Measure Ready */ +#define AT91_PMC_RCMEAS (1 << 20) /* RC Oscillator Frequency Measure (write-only) */ +#define AT91_PMC_CCSS (1 << 24) /* Counter Clock Source Selection */ +#define AT91_PMC_CCSS_RC_OSC (0 << 24) /* MAINF counter clock is the RC oscillator. */ +#define AT91_PMC_CCSS_XTAL_OSC (1 << 24) /* MAINF counter clock is the crystal oscillator. */ #define AT91_CKGR_PLLAR 0x28 /* PLL A Register */ #define AT91_CKGR_PLLBR 0x2c /* PLL B Register */ #define AT91_PMC_DIV (0xff << 0) /* Divider */ @@ -133,6 +138,7 @@ #define AT91_PMC_CSSMCK_MCK (1 << 8) #define AT91_PMC_IER 0x60 /* Interrupt Enable Register */ +#define AT91_PMC_MOSCXTS (1 << 0) /* Oscillator Startup Time */ #define AT91_PMC_IDR 0x64 /* Interrupt Disable Register */ #define AT91_PMC_SR 0x68 /* Status Register */ #define AT91_PMC_MOSCS (1 << 0) /* MOSCS Flag */ @@ -148,6 +154,17 @@ #define AT91_PMC_MOSCRCS (1 << 17) /* Main On-Chip RC [some SAM9] */ #define AT91_PMC_CFDEV (1 << 18) /* Clock Failure Detector Event [some SAM9] */ #define AT91_PMC_IMR 0x6c /* Interrupt Mask Register */ +#define AT91_PMC_PLLICPR 0x80 /* PLL Charge Pump Current Register */ +#define AT91_PMC_ICPPLLA (0xf << 0) +#define AT91_PMC_ICPPLLA_0 (0 << 0) +#define AT91_PMC_ICPPLLA_1 (1 << 0) +#define AT91_PMC_REALLOCK (0x1 << 7) +#define AT91_PMC_IPLLA (0xf << 8) +#define AT91_PMC_IPLLA_0 (0 << 8) +#define AT91_PMC_IPLLA_1 (1 << 8) +#define AT91_PMC_IPLLA_2 (2 << 8) +#define AT91_PMC_IPLLA_3 (3 << 8) + #define AT91_PMC_PROT 0xe4 /* Write Protect Mode Register [some SAM9] */ #define AT91_PMC_WPEN (0x1 << 0) /* Write Protect Enable */ @@ -163,6 +180,7 @@ #define AT91_PMC_PCR 0x10c /* Peripheral Control Register [some SAM9] */ #define AT91_PMC_PCR_PID (0x3f << 0) /* Peripheral ID */ #define AT91_PMC_PCR_CMD (0x1 << 12) /* Command */ +#define AT91_PMC_PCR_DIV_MASK (0x3 << 16) #define AT91_PMC_PCR_DIV(n) ((n) << 16) /* Divisor value */ #define AT91_PMC_PCR_DIV0 0x0 /* Peripheral clock is MCK */ #define AT91_PMC_PCR_DIV2 0x1 /* Peripheral clock is MCK/2 */ diff --git a/arch/arm/mach-at91/include/mach/at91_pmc_ll.h b/arch/arm/mach-at91/include/mach/at91_pmc_ll.h new file mode 100644 index 000000000000..eda40e8e12e7 --- /dev/null +++ b/arch/arm/mach-at91/include/mach/at91_pmc_ll.h @@ -0,0 +1,78 @@ +// SPDX-License-Identifier: BSD-1-Clause +/* + * Copyright (c) 2006, Atmel Corporation + */ + +#ifndef AT91_PMC_LL_H +#define AT91_PMC_LL_H + +#include <errno.h> +#include <asm/io.h> +#include <mach/at91_pmc.h> + +#define AT91_PMC_LL_FLAG_SAM9X5_PMC (1 << 0) +#define AT91_PMC_LL_FLAG_MEASURE_XTAL (1 << 1) +#define AT91_PMC_LL_FLAG_DISABLE_RC (1 << 2) + +#define AT91_PMC_LL_AT91RM9200 (0) +#define AT91_PMC_LL_AT91SAM9260 (0) +#define AT91_PMC_LL_AT91SAM9261 (0) +#define AT91_PMC_LL_AT91SAM9263 (0) +#define AT91_PMC_LL_AT91SAM9G45 (0) +#define AT91_PMC_LL_AT91SAM9X5 (AT91_PMC_LL_FLAG_SAM9X5_PMC | \ + AT91_PMC_LL_FLAG_DISABLE_RC) +#define AT91_PMC_LL_AT91SAM9N12 (AT91_PMC_LL_FLAG_SAM9X5_PMC | \ + AT91_PMC_LL_FLAG_DISABLE_RC) +#define AT91_PMC_LL_SAMA5D2 (AT91_PMC_LL_FLAG_SAM9X5_PMC | \ + AT91_PMC_LL_FLAG_MEASURE_XTAL) +#define AT91_PMC_LL_SAMA5D3 (AT91_PMC_LL_FLAG_SAM9X5_PMC | \ + AT91_PMC_LL_FLAG_DISABLE_RC) +#define AT91_PMC_LL_SAMA5D4 (AT91_PMC_LL_FLAG_SAM9X5_PMC) + +void at91_pmc_init(void __iomem *pmc_base, unsigned int flags); +void at91_pmc_cfg_mck(void __iomem *pmc_base, u32 pmc_mckr, unsigned int flags); +void at91_pmc_cfg_plla(void __iomem *pmc_base, u32 pmc_pllar, unsigned int flags); + +static inline void at91_pmc_init_pll(void __iomem *pmc_base, u32 pmc_pllicpr) +{ + writel(pmc_pllicpr, pmc_base + AT91_PMC_PLLICPR); +} + +static inline void at91_pmc_enable_system_clock(void __iomem *pmc_base, + unsigned clock_id) +{ + writel(clock_id, pmc_base + AT91_PMC_SCER); +} + +static inline int at91_pmc_enable_periph_clock(void __iomem *pmc_base, + unsigned periph_id) +{ + u32 mask = 0x01 << (periph_id % 32); + + if ((periph_id / 32) == 1) + writel(mask, pmc_base + AT91_PMC_PCER1); + else if ((periph_id / 32) == 0) + writel(mask, pmc_base + AT91_PMC_PCER); + else + return -EINVAL; + + return 0; +} + +static inline int at91_pmc_sam9x5_enable_periph_clock(void __iomem *pmc_base, + unsigned periph_id) +{ + u32 pcr = periph_id; + + if (periph_id >= 0x80) /* 7 bits only */ + return -EINVAL; + + writel(pcr, pmc_base + AT91_PMC_PCR); + pcr |= readl(pmc_base + AT91_PMC_PCR) & AT91_PMC_PCR_DIV_MASK; + pcr |= AT91_PMC_PCR_CMD | AT91_PMC_PCR_EN; + writel(pcr, pmc_base + AT91_PMC_PCR); + + return 0; +} + +#endif -- 2.20.1 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
