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linux-next/arch/arm/mach-imx/clock-imx35.c
Shawn Guo 62550cd7c0 dmaengine: imx-sdma: use platform_device_id to identify sdma version 
It might be not good to use software defined version to identify sdma
device type, when hardware does not define such version.  Instead,
soc name is stable enough to define the device type.

The patch uses platform_device_id rather than version number passed
by platform data to identify sdma device type/version.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Vinod Koul <vinod.koul@intel.com>
2011-07-27 09:31:45 +08:00

552 lines
15 KiB
C
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/*
* 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 <linux/clkdev.h>
#include <mach/clock.h>
#include <mach/hardware.h>
#include <mach/common.h>
#define CCM_BASE MX35_IO_ADDRESS(MX35_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 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();
aad = &clk_consumer[(pdr0 >> 16) & 0xf];
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_arm();
aad = &clk_consumer[(pdr0 >> 16) & 0xf];
return fref / aad->ahb;
}
static unsigned long get_rate_ipg(struct clk *clk)
{
return get_rate_ahb(NULL) >> 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 = ((pdr4 >> 10) & 0x3f) + 1;
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 / (div + 1);
}
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 / (((pdr2 >> 16) & 0x3f) + 1);
}
static unsigned long get_rate_otg(struct clk *clk)
{
unsigned long pdr4 = __raw_readl(CCM_BASE + CCM_PDR4);
unsigned long rate;
if (pdr4 & (1 << 9))
rate = get_rate_arm();
else
rate = get_rate_ppll();
return rate / (((pdr4 >> 22) & 0x3f) + 1);
}
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 div;
if (pdr0 & (1 << 26)) {
div = (pdr4 >> 16) & 0x3f;
return get_rate_arm() / (div + 1);
} else {
div = (pdr0 >> 12) & 0x7;
return get_rate_ahb(NULL) / (div + 1);
}
}
static unsigned long get_rate_hsp(struct clk *clk)
{
unsigned long hsp_podf = (__raw_readl(CCM_BASE + CCM_PDR0) >> 20) & 0x03;
unsigned long fref = get_rate_mpll();
if (fref > 400 * 1000 * 1000) {
switch (hsp_podf) {
case 0:
return fref >> 2;
case 1:
return fref >> 3;
case 2:
return fref / 3;
}
} else {
switch (hsp_podf) {
case 0:
case 2:
return fref / 3;
case 1:
return fref / 6;
}
}
return 0;
}
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, NULL);
DEFINE_CLOCK(epit2_clk, 1, CCM_CGR0, 22, get_rate_ipg, 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, get_rate_hsp, 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, get_rate_otg, NULL);
DEFINE_CLOCK(wdog_clk, 0, CCM_CGR2, 24, NULL, NULL);
DEFINE_CLOCK(max_clk, 0, CCM_CGR2, 26, NULL, NULL);
DEFINE_CLOCK(audmux_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_CLOCK(usbahb_clk, 0, 0, 0, get_rate_ahb, NULL);
static int clk_dummy_enable(struct clk *clk)
{
return 0;
}
static void clk_dummy_disable(struct clk *clk)
{
}
static unsigned long get_rate_nfc(struct clk *clk)
{
unsigned long div1;
div1 = (__raw_readl(CCM_BASE + CCM_PDR4) >> 28) + 1;
return get_rate_ahb(NULL) / div1;
}
/* NAND Controller: It seems it can't be disabled */
static struct clk nfc_clk = {
.id = 0,
.enable_reg = 0,
.enable_shift = 0,
.get_rate = get_rate_nfc,
.set_rate = NULL, /* set_rate_nfc, */
.enable = clk_dummy_enable,
.disable = clk_dummy_disable
};
#define _REGISTER_CLOCK(d, n, c) \
{ \
.dev_id = d, \
.con_id = n, \
.clk = &c, \
},
static struct clk_lookup lookups[] = {
_REGISTER_CLOCK(NULL, "asrc", asrc_clk)
_REGISTER_CLOCK(NULL, "ata", ata_clk)
_REGISTER_CLOCK("flexcan.0", NULL, can1_clk)
_REGISTER_CLOCK("flexcan.1", NULL, can2_clk)
_REGISTER_CLOCK("imx35-cspi.0", NULL, cspi1_clk)
_REGISTER_CLOCK("imx35-cspi.1", NULL, cspi2_clk)
_REGISTER_CLOCK(NULL, "ect", ect_clk)
_REGISTER_CLOCK(NULL, "edio", edio_clk)
_REGISTER_CLOCK(NULL, "emi", emi_clk)
_REGISTER_CLOCK("imx-epit.0", NULL, epit1_clk)
_REGISTER_CLOCK("imx-epit.1", NULL, epit2_clk)
_REGISTER_CLOCK(NULL, "esai", esai_clk)
_REGISTER_CLOCK("sdhci-esdhc-imx35.0", NULL, esdhc1_clk)
_REGISTER_CLOCK("sdhci-esdhc-imx35.1", NULL, esdhc2_clk)
_REGISTER_CLOCK("sdhci-esdhc-imx35.2", NULL, esdhc3_clk)
/* i.mx35 has the i.mx27 type fec */
_REGISTER_CLOCK("imx27-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("ipu-core", NULL, ipu_clk)
_REGISTER_CLOCK("mx3_sdc_fb", NULL, 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("imx35-sdma", NULL, sdma_clk)
_REGISTER_CLOCK(NULL, "spba", spba_clk)
_REGISTER_CLOCK(NULL, "spdif", spdif_clk)
_REGISTER_CLOCK("imx-ssi.0", NULL, ssi1_clk)
_REGISTER_CLOCK("imx-ssi.1", NULL, ssi2_clk)
/* i.mx35 has the i.mx21 type uart */
_REGISTER_CLOCK("imx21-uart.0", NULL, uart1_clk)
_REGISTER_CLOCK("imx21-uart.1", NULL, uart2_clk)
_REGISTER_CLOCK("imx21-uart.2", NULL, uart3_clk)
_REGISTER_CLOCK("mxc-ehci.0", "usb", usbotg_clk)
_REGISTER_CLOCK("mxc-ehci.1", "usb", usbotg_clk)
_REGISTER_CLOCK("mxc-ehci.2", "usb", usbotg_clk)
_REGISTER_CLOCK("fsl-usb2-udc", "usb", usbotg_clk)
_REGISTER_CLOCK("fsl-usb2-udc", "usb_ahb", usbahb_clk)
_REGISTER_CLOCK("imx2-wdt.0", NULL, wdog_clk)
_REGISTER_CLOCK(NULL, "max", max_clk)
_REGISTER_CLOCK(NULL, "audmux", audmux_clk)
_REGISTER_CLOCK(NULL, "csi", csi_clk)
_REGISTER_CLOCK(NULL, "iim", iim_clk)
_REGISTER_CLOCK(NULL, "gpu2d", gpu2d_clk)
_REGISTER_CLOCK("mxc_nand.0", NULL, nfc_clk)
};
int __init mx35_clocks_init()
{
unsigned int cgr2 = 3 << 26, cgr3 = 0;
#if defined(CONFIG_DEBUG_LL) && !defined(CONFIG_DEBUG_ICEDCC)
cgr2 |= 3 << 16;
#endif
clkdev_add_table(lookups, ARRAY_SIZE(lookups));
/* 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);
/*
* Check if we came up in internal boot mode. If yes, we need some
* extra clocks turned on, otherwise the MX35 boot ROM code will
* hang after a watchdog reset.
*/
if (!(__raw_readl(CCM_BASE + CCM_RCSR) & (3 << 10))) {
/* Additionally turn on UART1, SCC, and IIM clocks */
cgr2 |= 3 << 16 | 3 << 4;
cgr3 |= 3 << 2;
}
__raw_writel(cgr2, CCM_BASE + CCM_CGR2);
__raw_writel(cgr3, CCM_BASE + CCM_CGR3);
clk_enable(&iim_clk);
mx35_read_cpu_rev();
#ifdef CONFIG_MXC_USE_EPIT
epit_timer_init(&epit1_clk,
MX35_IO_ADDRESS(MX35_EPIT1_BASE_ADDR), MX35_INT_EPIT1);
#else
mxc_timer_init(&gpt_clk,
MX35_IO_ADDRESS(MX35_GPT1_BASE_ADDR), MX35_INT_GPT);
#endif
return 0;
}
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