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/*
* TNETV107X: Clock management APIs
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <common.h>
#include <asm-generic/errno.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/arch/clock.h>
#define CLOCK_BASE TNETV107X_CLOCK_CONTROL_BASE
#define PSC_BASE TNETV107X_PSC_BASE
#define BIT(x) (1 << (x))
#define MAX_PREDIV 64
#define MAX_POSTDIV 8
#define MAX_MULT 512
#define MAX_DIV (MAX_PREDIV * MAX_POSTDIV)
/* LPSC registers */
#define PSC_PTCMD 0x120
#define PSC_PTSTAT 0x128
#define PSC_MDSTAT(n) (0x800 + (n) * 4)
#define PSC_MDCTL(n) (0xA00 + (n) * 4)
#define PSC_MDCTL_LRSTZ BIT(8)
#define psc_reg_read(reg) __raw_readl((u32 *)(PSC_BASE + (reg)))
#define psc_reg_write(reg, val) __raw_writel(val, (u32 *)(PSC_BASE + (reg)))
/* SSPLL registers */
struct sspll_regs {
u32 modes;
u32 postdiv;
u32 prediv;
u32 mult_factor;
u32 divider_range;
u32 bw_divider;
u32 spr_amount;
u32 spr_rate_div;
u32 diag;
};
/* SSPLL base addresses */
static struct sspll_regs *sspll_regs[] = {
(struct sspll_regs *)(CLOCK_BASE + 0x040),
(struct sspll_regs *)(CLOCK_BASE + 0x080),
(struct sspll_regs *)(CLOCK_BASE + 0x0c0),
};
#define sspll_reg(pll, reg) (&(sspll_regs[pll]->reg))
#define sspll_reg_read(pll, reg) __raw_readl(sspll_reg(pll, reg))
#define sspll_reg_write(pll, reg, val) __raw_writel(val, sspll_reg(pll, reg))
/* PLL Control Registers */
struct pllctl_regs {
u32 ctl; /* 00 */
u32 ocsel; /* 04 */
u32 secctl; /* 08 */
u32 __pad0;
u32 mult; /* 10 */
u32 prediv; /* 14 */
u32 div1; /* 18 */
u32 div2; /* 1c */
u32 div3; /* 20 */
u32 oscdiv1; /* 24 */
u32 postdiv; /* 28 */
u32 bpdiv; /* 2c */
u32 wakeup; /* 30 */
u32 __pad1;
u32 cmd; /* 38 */
u32 stat; /* 3c */
u32 alnctl; /* 40 */
u32 dchange; /* 44 */
u32 cken; /* 48 */
u32 ckstat; /* 4c */
u32 systat; /* 50 */
u32 ckctl; /* 54 */
u32 __pad2[2];
u32 div4; /* 60 */
u32 div5; /* 64 */
u32 div6; /* 68 */
u32 div7; /* 6c */
u32 div8; /* 70 */
};
struct lpsc_map {
int pll, div;
};
static struct pllctl_regs *pllctl_regs[] = {
(struct pllctl_regs *)(CLOCK_BASE + 0x700),
(struct pllctl_regs *)(CLOCK_BASE + 0x300),
(struct pllctl_regs *)(CLOCK_BASE + 0x500),
};
#define pllctl_reg(pll, reg) (&(pllctl_regs[pll]->reg))
#define pllctl_reg_read(pll, reg) __raw_readl(pllctl_reg(pll, reg))
#define pllctl_reg_write(pll, reg, val) __raw_writel(val, pllctl_reg(pll, reg))
#define pllctl_reg_rmw(pll, reg, mask, val) \
pllctl_reg_write(pll, reg, \
(pllctl_reg_read(pll, reg) & ~(mask)) | val)
#define pllctl_reg_setbits(pll, reg, mask) \
pllctl_reg_rmw(pll, reg, 0, mask)
#define pllctl_reg_clrbits(pll, reg, mask) \
pllctl_reg_rmw(pll, reg, mask, 0)
/* PLLCTL Bits */
#define PLLCTL_CLKMODE BIT(8)
#define PLLCTL_PLLSELB BIT(7)
#define PLLCTL_PLLENSRC BIT(5)
#define PLLCTL_PLLDIS BIT(4)
#define PLLCTL_PLLRST BIT(3)
#define PLLCTL_PLLPWRDN BIT(1)
#define PLLCTL_PLLEN BIT(0)
#define PLLDIV_ENABLE BIT(15)
static int pll_div_offset[] = {
#define div_offset(reg) offsetof(struct pllctl_regs, reg)
div_offset(div1), div_offset(div2), div_offset(div3),
div_offset(div4), div_offset(div5), div_offset(div6),
div_offset(div7), div_offset(div8),
};
static unsigned long pll_bypass_mask[] = { 1, 4, 2 };
static unsigned long pll_div_mask[] = { 0x01ff, 0x00ff, 0x00ff };
/* Mappings from PLL+DIV to subsystem clocks */
#define sys_arm1176_clk {SYS_PLL, 0}
#define sys_dsp_clk {SYS_PLL, 1}
#define sys_ddr_clk {SYS_PLL, 2}
#define sys_full_clk {SYS_PLL, 3}
#define sys_lcd_clk {SYS_PLL, 4}
#define sys_vlynq_ref_clk {SYS_PLL, 5}
#define sys_tsc_clk {SYS_PLL, 6}
#define sys_half_clk {SYS_PLL, 7}
#define eth_clk_5 {ETH_PLL, 0}
#define eth_clk_50 {ETH_PLL, 1}
#define eth_clk_125 {ETH_PLL, 2}
#define eth_clk_250 {ETH_PLL, 3}
#define eth_clk_25 {ETH_PLL, 4}
#define tdm_clk {TDM_PLL, 0}
#define tdm_extra_clk {TDM_PLL, 1}
#define tdm1_clk {TDM_PLL, 2}
/* Optimization barrier */
#define barrier() \
__asm__ __volatile__("mov r0, r0\n" : : : "memory");
static const struct lpsc_map lpsc_clk_map[] = {
[TNETV107X_LPSC_ARM] = sys_arm1176_clk,
[TNETV107X_LPSC_GEM] = sys_dsp_clk,
[TNETV107X_LPSC_DDR2_PHY] = sys_ddr_clk,
[TNETV107X_LPSC_TPCC] = sys_full_clk,
[TNETV107X_LPSC_TPTC0] = sys_full_clk,
[TNETV107X_LPSC_TPTC1] = sys_full_clk,
[TNETV107X_LPSC_RAM] = sys_full_clk,
[TNETV107X_LPSC_MBX_LITE] = sys_arm1176_clk,
[TNETV107X_LPSC_LCD] = sys_lcd_clk,
[TNETV107X_LPSC_ETHSS] = eth_clk_125,
[TNETV107X_LPSC_AEMIF] = sys_full_clk,
[TNETV107X_LPSC_CHIP_CFG] = sys_half_clk,
[TNETV107X_LPSC_TSC] = sys_tsc_clk,
[TNETV107X_LPSC_ROM] = sys_half_clk,
[TNETV107X_LPSC_UART2] = sys_half_clk,
[TNETV107X_LPSC_PKTSEC] = sys_half_clk,
[TNETV107X_LPSC_SECCTL] = sys_half_clk,
[TNETV107X_LPSC_KEYMGR] = sys_half_clk,
[TNETV107X_LPSC_KEYPAD] = sys_half_clk,
[TNETV107X_LPSC_GPIO] = sys_half_clk,
[TNETV107X_LPSC_MDIO] = sys_half_clk,
[TNETV107X_LPSC_SDIO0] = sys_half_clk,
[TNETV107X_LPSC_UART0] = sys_half_clk,
[TNETV107X_LPSC_UART1] = sys_half_clk,
[TNETV107X_LPSC_TIMER0] = sys_half_clk,
[TNETV107X_LPSC_TIMER1] = sys_half_clk,
[TNETV107X_LPSC_WDT_ARM] = sys_half_clk,
[TNETV107X_LPSC_WDT_DSP] = sys_half_clk,
[TNETV107X_LPSC_SSP] = sys_half_clk,
[TNETV107X_LPSC_TDM0] = tdm_clk,
[TNETV107X_LPSC_VLYNQ] = sys_vlynq_ref_clk,
[TNETV107X_LPSC_MCDMA] = sys_half_clk,
[TNETV107X_LPSC_USB0] = sys_half_clk,
[TNETV107X_LPSC_TDM1] = tdm1_clk,
[TNETV107X_LPSC_DEBUGSS] = sys_half_clk,
[TNETV107X_LPSC_ETHSS_RGMII] = eth_clk_250,
[TNETV107X_LPSC_SYSTEM] = sys_half_clk,
[TNETV107X_LPSC_IMCOP] = sys_dsp_clk,
[TNETV107X_LPSC_SPARE] = sys_half_clk,
[TNETV107X_LPSC_SDIO1] = sys_half_clk,
[TNETV107X_LPSC_USB1] = sys_half_clk,
[TNETV107X_LPSC_USBSS] = sys_half_clk,
[TNETV107X_LPSC_DDR2_EMIF1_VRST] = sys_ddr_clk,
[TNETV107X_LPSC_DDR2_EMIF2_VCTL_RST] = sys_ddr_clk,
};
static const unsigned long pll_ext_freq[] = {
[SYS_PLL] = CONFIG_PLL_SYS_EXT_FREQ,
[ETH_PLL] = CONFIG_PLL_ETH_EXT_FREQ,
[TDM_PLL] = CONFIG_PLL_TDM_EXT_FREQ,
};
static unsigned long pll_freq_get(int pll)
{
unsigned long mult = 1, prediv = 1, postdiv = 1;
unsigned long ref = CONFIG_SYS_INT_OSC_FREQ;
unsigned long ret;
u32 bypass;
bypass = __raw_readl((u32 *)(CLOCK_BASE));
if (!(bypass & pll_bypass_mask[pll])) {
mult = sspll_reg_read(pll, mult_factor);
prediv = sspll_reg_read(pll, prediv) + 1;
postdiv = sspll_reg_read(pll, postdiv) + 1;
}
if (pllctl_reg_read(pll, ctl) & PLLCTL_CLKMODE)
ref = pll_ext_freq[pll];
if (!(pllctl_reg_read(pll, ctl) & PLLCTL_PLLEN))
return ref;
ret = (unsigned long)(ref + ((unsigned long long)ref * mult) / 256);
ret /= (prediv * postdiv);
return ret;
}
static unsigned long __pll_div_freq_get(int pll, unsigned int fpll,
int div)
{
int divider = 1;
unsigned long divreg;
divreg = __raw_readl((void *)pllctl_regs[pll] + pll_div_offset[div]);
if (divreg & PLLDIV_ENABLE)
divider = (divreg & pll_div_mask[pll]) + 1;
return fpll / divider;
}
static unsigned long pll_div_freq_get(int pll, int div)
{
unsigned int fpll = pll_freq_get(pll);
return __pll_div_freq_get(pll, fpll, div);
}
static void __pll_div_freq_set(int pll, unsigned int fpll, int div,
unsigned long hz)
{
int divider = (fpll / hz - 1);
divider &= pll_div_mask[pll];
divider |= PLLDIV_ENABLE;
__raw_writel(divider, (void *)pllctl_regs[pll] + pll_div_offset[div]);
pllctl_reg_setbits(pll, alnctl, (1 << div));
pllctl_reg_setbits(pll, dchange, (1 << div));
}
static unsigned long pll_div_freq_set(int pll, int div, unsigned long hz)
{
unsigned int fpll = pll_freq_get(pll);
__pll_div_freq_set(pll, fpll, div, hz);
pllctl_reg_write(pll, cmd, 1);
/* Wait until new divider takes effect */
while (pllctl_reg_read(pll, stat) & 0x01);
return __pll_div_freq_get(pll, fpll, div);
}
unsigned long clk_get_rate(unsigned int clk)
{
return pll_div_freq_get(lpsc_clk_map[clk].pll, lpsc_clk_map[clk].div);
}
unsigned long clk_round_rate(unsigned int clk, unsigned long hz)
{
unsigned long fpll, divider, pll;
pll = lpsc_clk_map[clk].pll;
fpll = pll_freq_get(pll);
divider = (fpll / hz - 1);
divider &= pll_div_mask[pll];
return fpll / (divider + 1);
}
int clk_set_rate(unsigned int clk, unsigned long _hz)
{
unsigned long hz;
hz = clk_round_rate(clk, _hz);
if (hz != _hz)
return -EINVAL; /* Cannot set to target freq */
pll_div_freq_set(lpsc_clk_map[clk].pll, lpsc_clk_map[clk].div, hz);
return 0;
}
void lpsc_control(int mod, unsigned long state, int lrstz)
{
u32 mdctl;
mdctl = psc_reg_read(PSC_MDCTL(mod));
mdctl &= ~0x1f;
mdctl |= state;
if (lrstz == 0)
mdctl &= ~PSC_MDCTL_LRSTZ;
else if (lrstz == 1)
mdctl |= PSC_MDCTL_LRSTZ;
psc_reg_write(PSC_MDCTL(mod), mdctl);
psc_reg_write(PSC_PTCMD, 1);
/* wait for power domain transition to end */
while (psc_reg_read(PSC_PTSTAT) & 1);
/* Wait for module state change */
while ((psc_reg_read(PSC_MDSTAT(mod)) & 0x1f) != state);
}
int lpsc_status(unsigned int id)
{
return psc_reg_read(PSC_MDSTAT(id)) & 0x1f;
}
static void init_pll(const struct pll_init_data *data)
{
unsigned long fpll;
unsigned long best_pre = 0, best_post = 0, best_mult = 0;
unsigned long div, prediv, postdiv, mult;
unsigned long delta, actual;
long best_delta = -1;
int i;
u32 tmp;
if (data->pll == SYS_PLL)
return; /* cannot reconfigure system pll on the fly */
tmp = pllctl_reg_read(data->pll, ctl);
if (data->internal_osc) {
tmp &= ~PLLCTL_CLKMODE;
fpll = CONFIG_SYS_INT_OSC_FREQ;
} else {
tmp |= PLLCTL_CLKMODE;
fpll = pll_ext_freq[data->pll];
}
pllctl_reg_write(data->pll, ctl, tmp);
mult = data->pll_freq / fpll;
for (mult = MAX(mult, 1); mult <= MAX_MULT; mult++) {
div = (fpll * mult) / data->pll_freq;
if (div < 1 || div > MAX_DIV)
continue;
for (postdiv = 1; postdiv <= min(div, MAX_POSTDIV); postdiv++) {
prediv = div / postdiv;
if (prediv < 1 || prediv > MAX_PREDIV)
continue;
actual = (fpll / prediv) * (mult / postdiv);
delta = (actual - data->pll_freq);
if (delta < 0)
delta = -delta;
if ((delta < best_delta) || (best_delta == -1)) {
best_delta = delta;
best_mult = mult;
best_pre = prediv;
best_post = postdiv;
if (delta == 0)
goto done;
}
}
}
done:
if (best_delta == -1) {
printf("pll cannot derive %lu from %lu\n",
data->pll_freq, fpll);
return;
}
fpll = fpll * best_mult;
fpll /= best_pre * best_post;
pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLENSRC);
pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLEN);
pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLRST);
pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLPWRDN);
pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLDIS);
sspll_reg_write(data->pll, mult_factor, (best_mult - 1) << 8);
sspll_reg_write(data->pll, prediv, best_pre - 1);
sspll_reg_write(data->pll, postdiv, best_post - 1);
for (i = 0; i < 10; i++)
if (data->div_freq[i])
__pll_div_freq_set(data->pll, fpll, i,
data->div_freq[i]);
pllctl_reg_write(data->pll, cmd, 1);
/* Wait until pll "go" operation completes */
while (pllctl_reg_read(data->pll, stat) & 0x01);
pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLRST);
pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLEN);
}
void init_plls(int num_pll, struct pll_init_data *config)
{
int i;
for (i = 0; i < num_pll; i++)
init_pll(&config[i]);
}