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[ARM] 3386/1: AT91RM9200 Clock update

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Patch from Andrew Victor

This patch includes a few changes to the clock support on the
AT91RM9200.

1. Added definitions for Ethernet, MMC, TWI, USARTs, and SPI peripheral
clocks.

2. Replaced some hard-coded hex values with the text definitions in
at91rm9200_sys.h.

3. If the USB96M bit is set for PLLB, then the rate of PLLB is not
affected but only the USB Host/Device clocks which are derived from it.
Issue reported by Sergei Sharonov.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Andrew Victor 2006-03-22 20:14:14 +00:00 committed by Russell King
parent 39806805de
commit 69b648a200
1 changed files with 73 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

85
arch/arm/mach-at91rm9200/clock.c
View File

@ -201,6 +201,54 @@ static struct clk ohci_clk = {
.pmc_mask = 1 << AT91_ID_UHP,
.mode = pmc_periph_mode,
};
static struct clk ether_clk = {
.name = "ether_clk",
.parent = &mck,
.pmc_mask = 1 << AT91_ID_EMAC,
.mode = pmc_periph_mode,
};
static struct clk mmc_clk = {
.name = "mci_clk",
.parent = &mck,
.pmc_mask = 1 << AT91_ID_MCI,
.mode = pmc_periph_mode,
};
static struct clk twi_clk = {
.name = "twi_clk",
.parent = &mck,
.pmc_mask = 1 << AT91_ID_TWI,
.mode = pmc_periph_mode,
};
static struct clk usart0_clk = {
.name = "usart0_clk",
.parent = &mck,
.pmc_mask = 1 << AT91_ID_US0,
.mode = pmc_periph_mode,
};
static struct clk usart1_clk = {
.name = "usart1_clk",
.parent = &mck,
.pmc_mask = 1 << AT91_ID_US1,
.mode = pmc_periph_mode,
};
static struct clk usart2_clk = {
.name = "usart2_clk",
.parent = &mck,
.pmc_mask = 1 << AT91_ID_US2,
.mode = pmc_periph_mode,
};
static struct clk usart3_clk = {
.name = "usart3_clk",
.parent = &mck,
.pmc_mask = 1 << AT91_ID_US3,
.mode = pmc_periph_mode,
};
static struct clk spi_clk = {
.name = "spi0_clk",
.parent = &mck,
.pmc_mask = 1 << AT91_ID_SPI,
.mode = pmc_periph_mode,
};
static struct clk *const clock_list[] = {
/* four primary clocks -- MUST BE FIRST! */
@ -223,15 +271,18 @@ static struct clk *const clock_list[] = {
/* MCK and peripherals */
&mck,
// usart0..usart3
// mmc
&usart0_clk,
&usart1_clk,
&usart2_clk,
&usart3_clk,
&mmc_clk,
&udc_clk,
// i2c
// spi
&twi_clk,
&spi_clk,
// ssc0..ssc2
// tc0..tc5
&ohci_clk,
// ether
&ether_clk,
};
@ -360,7 +411,7 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
u32 pckr;
pckr = at91_sys_read(AT91_PMC_PCKR(clk->id));
pckr &= 0x03;
pckr &= AT91_PMC_CSS_PLLB; /* clock selection */
pckr |= prescale << 2;
at91_sys_write(AT91_PMC_PCKR(clk->id), pckr);
clk->rate_hz = actual;
@ -440,7 +491,7 @@ static int at91_clk_show(struct seq_file *s, void *unused)
else
state = "";
seq_printf(s, "%-10s users=%d %-3s %9ld Hz %s\n",
seq_printf(s, "%-10s users=%2d %-3s %9ld Hz %s\n",
clk->name, clk->users, state, clk_get_rate(clk),
clk->parent ? clk->parent->name : "");
}
@ -483,11 +534,18 @@ static u32 __init at91_pll_rate(struct clk *pll, u32 freq, u32 reg)
freq *= mul + 1;
} else
freq = 0;
if (pll == &pllb && (reg & (1 << 28)))
freq /= 2;
return freq;
}
static u32 __init at91_usb_rate(struct clk *pll, u32 freq, u32 reg)
{
if (pll == &pllb && (reg & AT91_PMC_USB96M))
return freq / 2;
else
return freq;
}
static unsigned __init at91_pll_calc(unsigned main_freq, unsigned out_freq)
{
unsigned i, div = 0, mul = 0, diff = 1 << 30;
@ -550,8 +608,8 @@ int __init at91_clock_init(unsigned long main_clock)
if (!main_clock) {
do {
tmp = at91_sys_read(AT91_CKGR_MCFR);
} while (!(tmp & 0x10000));
main_clock = (tmp & 0xffff) * (AT91_SLOW_CLOCK / 16);
} while (!(tmp & AT91_PMC_MAINRDY));
main_clock = (tmp & AT91_PMC_MAINF) * (AT91_SLOW_CLOCK / 16);
}
main_clk.rate_hz = main_clock;
@ -566,13 +624,16 @@ int __init at91_clock_init(unsigned long main_clock)
*
* REVISIT: assumes MCK doesn't derive from PLLB!
*/
at91_pllb_usb_init = at91_pll_calc(main_clock, 48000000 * 2) | 0x10000000;
at91_pllb_usb_init = at91_pll_calc(main_clock, 48000000 * 2) | AT91_PMC_USB96M;
pllb.rate_hz = at91_pll_rate(&pllb, main_clock, at91_pllb_usb_init);
at91_sys_write(AT91_PMC_PCDR, (1 << AT91_ID_UHP) | (1 << AT91_ID_UDP));
at91_sys_write(AT91_PMC_SCDR, AT91_PMC_UHP | AT91_PMC_UDP);
at91_sys_write(AT91_CKGR_PLLBR, 0);
at91_sys_write(AT91_PMC_SCER, AT91_PMC_MCKUDP);
udpck.rate_hz = at91_usb_rate(&pllb, pllb.rate_hz, at91_pllb_usb_init);
uhpck.rate_hz = at91_usb_rate(&pllb, pllb.rate_hz, at91_pllb_usb_init);
/*
* MCK and CPU derive from one of those primary clocks.
* For now, assume this parentage won't change.