Commit 2cb536d1 authored by Sascha Hauer's avatar Sascha Hauer
Browse files

[ARM] MX35: add clock support



This patch adds clock support for i.MX35 SoCs. We do not support setting
of clock rates yet, but most interesting clock rates should be reported.
I couldn't test all clock rates and the datasheet contains some obvious
bugs, so expect some bugs in this code.
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
parent cb8ebb02
......@@ -6,6 +6,7 @@
obj-y := mm.o devices.o
obj-$(CONFIG_ARCH_MX31) += clock.o iomux.o
obj-$(CONFIG_ARCH_MX35) += clock-imx35.o
obj-$(CONFIG_MACH_MX31ADS) += mx31ads.o
obj-$(CONFIG_MACH_MX31LITE) += mx31lite.o
obj-$(CONFIG_MACH_PCM037) += pcm037.o
......
/*
* Copyright (C) 2009 by Sascha Hauer, Pengutronix
*
* 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 Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <asm/clkdev.h>
#include <mach/clock.h>
#include <mach/hardware.h>
#include <mach/common.h>
#define CCM_BASE IO_ADDRESS(CCM_BASE_ADDR)
#define CCM_CCMR 0x00
#define CCM_PDR0 0x04
#define CCM_PDR1 0x08
#define CCM_PDR2 0x0C
#define CCM_PDR3 0x10
#define CCM_PDR4 0x14
#define CCM_RCSR 0x18
#define CCM_MPCTL 0x1C
#define CCM_PPCTL 0x20
#define CCM_ACMR 0x24
#define CCM_COSR 0x28
#define CCM_CGR0 0x2C
#define CCM_CGR1 0x30
#define CCM_CGR2 0x34
#define CCM_CGR3 0x38
#ifdef HAVE_SET_RATE_SUPPORT
static void calc_dividers(u32 div, u32 *pre, u32 *post, u32 maxpost)
{
u32 min_pre, temp_pre, old_err, err;
min_pre = (div - 1) / maxpost + 1;
old_err = 8;
for (temp_pre = 8; temp_pre >= min_pre; temp_pre--) {
if (div > (temp_pre * maxpost))
break;
if (div < (temp_pre * temp_pre))
continue;
err = div % temp_pre;
if (err == 0) {
*pre = temp_pre;
break;
}
err = temp_pre - err;
if (err < old_err) {
old_err = err;
*pre = temp_pre;
}
}
*post = (div + *pre - 1) / *pre;
}
/* get the best values for a 3-bit divider combined with a 6-bit divider */
static void calc_dividers_3_6(u32 div, u32 *pre, u32 *post)
{
if (div >= 512) {
*pre = 8;
*post = 64;
} else if (div >= 64) {
calc_dividers(div, pre, post, 64);
} else if (div <= 8) {
*pre = div;
*post = 1;
} else {
*pre = 1;
*post = div;
}
}
/* get the best values for two cascaded 3-bit dividers */
static void calc_dividers_3_3(u32 div, u32 *pre, u32 *post)
{
if (div >= 64) {
*pre = *post = 8;
} else if (div > 8) {
calc_dividers(div, pre, post, 8);
} else {
*pre = 1;
*post = div;
}
}
#endif
static unsigned long get_rate_mpll(void)
{
ulong mpctl = __raw_readl(CCM_BASE + CCM_MPCTL);
return mxc_decode_pll(mpctl, 24000000);
}
static unsigned long get_rate_ppll(void)
{
ulong ppctl = __raw_readl(CCM_BASE + CCM_PPCTL);
return mxc_decode_pll(ppctl, 24000000);
}
struct arm_ahb_div {
unsigned char arm, ahb, sel;
};
static struct arm_ahb_div clk_consumer[] = {
{ .arm = 1, .ahb = 4, .sel = 0},
{ .arm = 1, .ahb = 3, .sel = 1},
{ .arm = 2, .ahb = 2, .sel = 0},
{ .arm = 0, .ahb = 0, .sel = 0},
{ .arm = 0, .ahb = 0, .sel = 0},
{ .arm = 0, .ahb = 0, .sel = 0},
{ .arm = 4, .ahb = 1, .sel = 0},
{ .arm = 1, .ahb = 5, .sel = 0},
{ .arm = 1, .ahb = 8, .sel = 0},
{ .arm = 1, .ahb = 6, .sel = 1},
{ .arm = 2, .ahb = 4, .sel = 0},
{ .arm = 0, .ahb = 0, .sel = 0},
{ .arm = 0, .ahb = 0, .sel = 0},
{ .arm = 0, .ahb = 0, .sel = 0},
{ .arm = 4, .ahb = 2, .sel = 0},
{ .arm = 0, .ahb = 0, .sel = 0},
};
static struct arm_ahb_div clk_automotive[] = {
{ .arm = 1, .ahb = 3, .sel = 0},
{ .arm = 1, .ahb = 2, .sel = 1},
{ .arm = 2, .ahb = 1, .sel = 1},
{ .arm = 0, .ahb = 0, .sel = 0},
{ .arm = 1, .ahb = 6, .sel = 0},
{ .arm = 1, .ahb = 4, .sel = 1},
{ .arm = 2, .ahb = 2, .sel = 1},
{ .arm = 0, .ahb = 0, .sel = 0},
};
static unsigned long get_rate_arm(void)
{
unsigned long pdr0 = __raw_readl(CCM_BASE + CCM_PDR0);
struct arm_ahb_div *aad;
unsigned long fref = get_rate_mpll();
if (pdr0 & 1) {
/* consumer path */
aad = &clk_consumer[(pdr0 >> 16) & 0xf];
if (aad->sel)
fref = fref * 2 / 3;
} else {
/* auto path */
aad = &clk_automotive[(pdr0 >> 9) & 0x7];
if (aad->sel)
fref = fref * 3 / 4;
}
return fref / aad->arm;
}
static unsigned long get_rate_ahb(struct clk *clk)
{
unsigned long pdr0 = __raw_readl(CCM_BASE + CCM_PDR0);
struct arm_ahb_div *aad;
unsigned long fref = get_rate_mpll();
if (pdr0 & 1)
/* consumer path */
aad = &clk_consumer[(pdr0 >> 16) & 0xf];
else
/* auto path */
aad = &clk_automotive[(pdr0 >> 9) & 0x7];
return fref / aad->ahb;
}
static unsigned long get_rate_ipg(struct clk *clk)
{
return get_rate_ahb(NULL) >> 1;
}
static unsigned long get_3_3_div(unsigned long in)
{
return (((in >> 3) & 0x7) + 1) * ((in & 0x7) + 1);
}
static unsigned long get_rate_uart(struct clk *clk)
{
unsigned long pdr3 = __raw_readl(CCM_BASE + CCM_PDR3);
unsigned long pdr4 = __raw_readl(CCM_BASE + CCM_PDR4);
unsigned long div = get_3_3_div(pdr4 >> 10);
if (pdr3 & (1 << 14))
return get_rate_arm() / div;
else
return get_rate_ppll() / div;
}
static unsigned long get_rate_sdhc(struct clk *clk)
{
unsigned long pdr3 = __raw_readl(CCM_BASE + CCM_PDR3);
unsigned long div, rate;
if (pdr3 & (1 << 6))
rate = get_rate_arm();
else
rate = get_rate_ppll();
switch (clk->id) {
default:
case 0:
div = pdr3 & 0x3f;
break;
case 1:
div = (pdr3 >> 8) & 0x3f;
break;
case 2:
div = (pdr3 >> 16) & 0x3f;
break;
}
return rate / get_3_3_div(div);
}
static unsigned long get_rate_mshc(struct clk *clk)
{
unsigned long pdr1 = __raw_readl(CCM_BASE + CCM_PDR1);
unsigned long div1, div2, rate;
if (pdr1 & (1 << 7))
rate = get_rate_arm();
else
rate = get_rate_ppll();
div1 = (pdr1 >> 29) & 0x7;
div2 = (pdr1 >> 22) & 0x3f;
return rate / ((div1 + 1) * (div2 + 1));
}
static unsigned long get_rate_ssi(struct clk *clk)
{
unsigned long pdr2 = __raw_readl(CCM_BASE + CCM_PDR2);
unsigned long div1, div2, rate;
if (pdr2 & (1 << 6))
rate = get_rate_arm();
else
rate = get_rate_ppll();
switch (clk->id) {
default:
case 0:
div1 = pdr2 & 0x3f;
div2 = (pdr2 >> 24) & 0x7;
break;
case 1:
div1 = (pdr2 >> 8) & 0x3f;
div2 = (pdr2 >> 27) & 0x7;
break;
}
return rate / ((div1 + 1) * (div2 + 1));
}
static unsigned long get_rate_csi(struct clk *clk)
{
unsigned long pdr2 = __raw_readl(CCM_BASE + CCM_PDR2);
unsigned long rate;
if (pdr2 & (1 << 7))
rate = get_rate_arm();
else
rate = get_rate_ppll();
return rate / get_3_3_div((pdr2 >> 16) & 0x3f);
}
static unsigned long get_rate_ipg_per(struct clk *clk)
{
unsigned long pdr0 = __raw_readl(CCM_BASE + CCM_PDR0);
unsigned long pdr4 = __raw_readl(CCM_BASE + CCM_PDR4);
unsigned long div1, div2;
if (pdr0 & (1 << 26)) {
div1 = (pdr4 >> 19) & 0x7;
div2 = (pdr4 >> 16) & 0x7;
return get_rate_arm() / ((div1 + 1) * (div2 + 1));
} else {
div1 = (pdr0 >> 12) & 0x7;
return get_rate_ahb(NULL) / div1;
}
}
static int clk_cgr_enable(struct clk *clk)
{
u32 reg;
reg = __raw_readl(clk->enable_reg);
reg |= 3 << clk->enable_shift;
__raw_writel(reg, clk->enable_reg);
return 0;
}
static void clk_cgr_disable(struct clk *clk)
{
u32 reg;
reg = __raw_readl(clk->enable_reg);
reg &= ~(3 << clk->enable_shift);
__raw_writel(reg, clk->enable_reg);
}
#define DEFINE_CLOCK(name, i, er, es, gr, sr) \
static struct clk name = { \
.id = i, \
.enable_reg = CCM_BASE + er, \
.enable_shift = es, \
.get_rate = gr, \
.set_rate = sr, \
.enable = clk_cgr_enable, \
.disable = clk_cgr_disable, \
}
DEFINE_CLOCK(asrc_clk, 0, CCM_CGR0, 0, NULL, NULL);
DEFINE_CLOCK(ata_clk, 0, CCM_CGR0, 2, get_rate_ipg, NULL);
DEFINE_CLOCK(audmux_clk, 0, CCM_CGR0, 4, NULL, NULL);
DEFINE_CLOCK(can1_clk, 0, CCM_CGR0, 6, get_rate_ipg, NULL);
DEFINE_CLOCK(can2_clk, 1, CCM_CGR0, 8, get_rate_ipg, NULL);
DEFINE_CLOCK(cspi1_clk, 0, CCM_CGR0, 10, get_rate_ipg, NULL);
DEFINE_CLOCK(cspi2_clk, 1, CCM_CGR0, 12, get_rate_ipg, NULL);
DEFINE_CLOCK(ect_clk, 0, CCM_CGR0, 14, get_rate_ipg, NULL);
DEFINE_CLOCK(edio_clk, 0, CCM_CGR0, 16, NULL, NULL);
DEFINE_CLOCK(emi_clk, 0, CCM_CGR0, 18, get_rate_ipg, NULL);
DEFINE_CLOCK(epit1_clk, 0, CCM_CGR0, 20, get_rate_ipg_per, NULL);
DEFINE_CLOCK(epit2_clk, 1, CCM_CGR0, 22, get_rate_ipg_per, NULL);
DEFINE_CLOCK(esai_clk, 0, CCM_CGR0, 24, NULL, NULL);
DEFINE_CLOCK(esdhc1_clk, 0, CCM_CGR0, 26, get_rate_sdhc, NULL);
DEFINE_CLOCK(esdhc2_clk, 1, CCM_CGR0, 28, get_rate_sdhc, NULL);
DEFINE_CLOCK(esdhc3_clk, 2, CCM_CGR0, 30, get_rate_sdhc, NULL);
DEFINE_CLOCK(fec_clk, 0, CCM_CGR1, 0, get_rate_ipg, NULL);
DEFINE_CLOCK(gpio1_clk, 0, CCM_CGR1, 2, NULL, NULL);
DEFINE_CLOCK(gpio2_clk, 1, CCM_CGR1, 4, NULL, NULL);
DEFINE_CLOCK(gpio3_clk, 2, CCM_CGR1, 6, NULL, NULL);
DEFINE_CLOCK(gpt_clk, 0, CCM_CGR1, 8, get_rate_ipg, NULL);
DEFINE_CLOCK(i2c1_clk, 0, CCM_CGR1, 10, get_rate_ipg_per, NULL);
DEFINE_CLOCK(i2c2_clk, 1, CCM_CGR1, 12, get_rate_ipg_per, NULL);
DEFINE_CLOCK(i2c3_clk, 2, CCM_CGR1, 14, get_rate_ipg_per, NULL);
DEFINE_CLOCK(iomuxc_clk, 0, CCM_CGR1, 16, NULL, NULL);
DEFINE_CLOCK(ipu_clk, 0, CCM_CGR1, 18, NULL, NULL);
DEFINE_CLOCK(kpp_clk, 0, CCM_CGR1, 20, get_rate_ipg, NULL);
DEFINE_CLOCK(mlb_clk, 0, CCM_CGR1, 22, get_rate_ahb, NULL);
DEFINE_CLOCK(mshc_clk, 0, CCM_CGR1, 24, get_rate_mshc, NULL);
DEFINE_CLOCK(owire_clk, 0, CCM_CGR1, 26, get_rate_ipg_per, NULL);
DEFINE_CLOCK(pwm_clk, 0, CCM_CGR1, 28, get_rate_ipg_per, NULL);
DEFINE_CLOCK(rngc_clk, 0, CCM_CGR1, 30, get_rate_ipg, NULL);
DEFINE_CLOCK(rtc_clk, 0, CCM_CGR2, 0, get_rate_ipg, NULL);
DEFINE_CLOCK(rtic_clk, 0, CCM_CGR2, 2, get_rate_ahb, NULL);
DEFINE_CLOCK(scc_clk, 0, CCM_CGR2, 4, get_rate_ipg, NULL);
DEFINE_CLOCK(sdma_clk, 0, CCM_CGR2, 6, NULL, NULL);
DEFINE_CLOCK(spba_clk, 0, CCM_CGR2, 8, get_rate_ipg, NULL);
DEFINE_CLOCK(spdif_clk, 0, CCM_CGR2, 10, NULL, NULL);
DEFINE_CLOCK(ssi1_clk, 0, CCM_CGR2, 12, get_rate_ssi, NULL);
DEFINE_CLOCK(ssi2_clk, 1, CCM_CGR2, 14, get_rate_ssi, NULL);
DEFINE_CLOCK(uart1_clk, 0, CCM_CGR2, 16, get_rate_uart, NULL);
DEFINE_CLOCK(uart2_clk, 1, CCM_CGR2, 18, get_rate_uart, NULL);
DEFINE_CLOCK(uart3_clk, 2, CCM_CGR2, 20, get_rate_uart, NULL);
DEFINE_CLOCK(usbotg_clk, 0, CCM_CGR2, 22, NULL, NULL);
DEFINE_CLOCK(wdog_clk, 0, CCM_CGR2, 24, NULL, NULL);
DEFINE_CLOCK(max_clk, 0, CCM_CGR2, 26, NULL, NULL);
DEFINE_CLOCK(admux_clk, 0, CCM_CGR2, 30, NULL, NULL);
DEFINE_CLOCK(csi_clk, 0, CCM_CGR3, 0, get_rate_csi, NULL);
DEFINE_CLOCK(iim_clk, 0, CCM_CGR3, 2, NULL, NULL);
DEFINE_CLOCK(gpu2d_clk, 0, CCM_CGR3, 4, NULL, NULL);
#define _REGISTER_CLOCK(d, n, c) \
{ \
.dev_id = d, \
.con_id = n, \
.clk = &c, \
},
static struct clk_lookup lookups[] __initdata = {
_REGISTER_CLOCK(NULL, "asrc", asrc_clk)
_REGISTER_CLOCK(NULL, "ata", ata_clk)
_REGISTER_CLOCK(NULL, "audmux", audmux_clk)
_REGISTER_CLOCK(NULL, "can", can1_clk)
_REGISTER_CLOCK(NULL, "can", can2_clk)
_REGISTER_CLOCK("spi_imx.0", NULL, cspi1_clk)
_REGISTER_CLOCK("spi_imx.1", NULL, cspi2_clk)
_REGISTER_CLOCK(NULL, "ect", ect_clk)
_REGISTER_CLOCK(NULL, "edio", edio_clk)
_REGISTER_CLOCK(NULL, "emi", emi_clk)
_REGISTER_CLOCK(NULL, "epit", epit1_clk)
_REGISTER_CLOCK(NULL, "epit", epit2_clk)
_REGISTER_CLOCK(NULL, "esai", esai_clk)
_REGISTER_CLOCK(NULL, "sdhc", esdhc1_clk)
_REGISTER_CLOCK(NULL, "sdhc", esdhc2_clk)
_REGISTER_CLOCK(NULL, "sdhc", esdhc3_clk)
_REGISTER_CLOCK("fec.0", NULL, fec_clk)
_REGISTER_CLOCK(NULL, "gpio", gpio1_clk)
_REGISTER_CLOCK(NULL, "gpio", gpio2_clk)
_REGISTER_CLOCK(NULL, "gpio", gpio3_clk)
_REGISTER_CLOCK("gpt.0", NULL, gpt_clk)
_REGISTER_CLOCK("imx-i2c.0", NULL, i2c1_clk)
_REGISTER_CLOCK("imx-i2c.1", NULL, i2c2_clk)
_REGISTER_CLOCK("imx-i2c.2", NULL, i2c3_clk)
_REGISTER_CLOCK(NULL, "iomuxc", iomuxc_clk)
_REGISTER_CLOCK(NULL, "ipu", ipu_clk)
_REGISTER_CLOCK(NULL, "kpp", kpp_clk)
_REGISTER_CLOCK(NULL, "mlb", mlb_clk)
_REGISTER_CLOCK(NULL, "mshc", mshc_clk)
_REGISTER_CLOCK("mxc_w1", NULL, owire_clk)
_REGISTER_CLOCK(NULL, "pwm", pwm_clk)
_REGISTER_CLOCK(NULL, "rngc", rngc_clk)
_REGISTER_CLOCK(NULL, "rtc", rtc_clk)
_REGISTER_CLOCK(NULL, "rtic", rtic_clk)
_REGISTER_CLOCK(NULL, "scc", scc_clk)
_REGISTER_CLOCK(NULL, "sdma", sdma_clk)
_REGISTER_CLOCK(NULL, "spba", spba_clk)
_REGISTER_CLOCK(NULL, "spdif", spdif_clk)
_REGISTER_CLOCK(NULL, "ssi", ssi1_clk)
_REGISTER_CLOCK(NULL, "ssi", ssi2_clk)
_REGISTER_CLOCK("imx-uart.0", NULL, uart1_clk)
_REGISTER_CLOCK("imx-uart.1", NULL, uart2_clk)
_REGISTER_CLOCK("imx-uart.2", NULL, uart3_clk)
_REGISTER_CLOCK(NULL, "usbotg", usbotg_clk)
_REGISTER_CLOCK("mxc_wdt.0", NULL, wdog_clk)
_REGISTER_CLOCK(NULL, "max", max_clk)
_REGISTER_CLOCK(NULL, "admux", admux_clk)
_REGISTER_CLOCK(NULL, "csi", csi_clk)
_REGISTER_CLOCK(NULL, "iim", iim_clk)
_REGISTER_CLOCK(NULL, "gpu2d", gpu2d_clk)
};
int __init mx35_clocks_init()
{
int i;
unsigned int ll = 0;
mxc_set_cpu_type(MXC_CPU_MX35);
#ifdef CONFIG_DEBUG_LL_CONSOLE
ll = (3 << 16);
#endif
for (i = 0; i < ARRAY_SIZE(lookups); i++)
clkdev_add(&lookups[i]);
/* Turn off all clocks except the ones we need to survive, namely:
* EMI, GPIO1/2/3, GPT, IOMUX, MAX and eventually uart
*/
__raw_writel((3 << 18), CCM_BASE + CCM_CGR0);
__raw_writel((3 << 2) | (3 << 4) | (3 << 6) | (3 << 8) | (3 << 16),
CCM_BASE + CCM_CGR1);
__raw_writel((3 << 26) | ll, CCM_BASE + CCM_CGR2);
__raw_writel(0, CCM_BASE + CCM_CGR3);
mxc_timer_init(&gpt_clk);
return 0;
}
......@@ -21,6 +21,7 @@ extern int mx1_clocks_init(unsigned long fref);
extern int mx21_clocks_init(unsigned long lref, unsigned long fref);
extern int mx27_clocks_init(unsigned long fref);
extern int mx31_clocks_init(unsigned long fref);
extern int mx35_clocks_init(void);
extern int mxc_register_gpios(void);
extern int mxc_register_device(struct platform_device *pdev, void *data);
extern void mxc_set_cpu_type(unsigned int type);
......
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