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Diffstat (limited to 'arch/arm/mach-shmobile/clock-sh73a0.c')
-rw-r--r--arch/arm/mach-shmobile/clock-sh73a0.c111
1 files changed, 109 insertions, 2 deletions
diff --git a/arch/arm/mach-shmobile/clock-sh73a0.c b/arch/arm/mach-shmobile/clock-sh73a0.c
index 784fbaa4cc5..d9fd0336b91 100644
--- a/arch/arm/mach-shmobile/clock-sh73a0.c
+++ b/arch/arm/mach-shmobile/clock-sh73a0.c
@@ -228,6 +228,11 @@ enum { DIV4_I, DIV4_ZG, DIV4_M3, DIV4_B, DIV4_M1, DIV4_M2,
static struct clk div4_clks[DIV4_NR] = {
[DIV4_I] = DIV4(FRQCRA, 20, 0xdff, CLK_ENABLE_ON_INIT),
+ /*
+ * ZG clock is dividing PLL0 frequency to supply SGX. Make sure not to
+ * exceed maximum frequencies of 201.5MHz for VDD_DVFS=1.175 and
+ * 239.2MHz for VDD_DVFS=1.315V.
+ */
[DIV4_ZG] = SH_CLK_DIV4(&pll0_clk, FRQCRA, 16, 0xd7f, CLK_ENABLE_ON_INIT),
[DIV4_M3] = DIV4(FRQCRA, 12, 0x1dff, CLK_ENABLE_ON_INIT),
[DIV4_B] = DIV4(FRQCRA, 8, 0xdff, CLK_ENABLE_ON_INIT),
@@ -252,6 +257,101 @@ static struct clk twd_clk = {
.ops = &twd_clk_ops,
};
+static struct sh_clk_ops zclk_ops, kicker_ops;
+static const struct sh_clk_ops *div4_clk_ops;
+
+static int zclk_set_rate(struct clk *clk, unsigned long rate)
+{
+ int ret;
+
+ if (!clk->parent || !__clk_get(clk->parent))
+ return -ENODEV;
+
+ if (readl(FRQCRB) & (1 << 31))
+ return -EBUSY;
+
+ if (rate == clk_get_rate(clk->parent)) {
+ /* 1:1 - switch off divider */
+ __raw_writel(__raw_readl(FRQCRB) & ~(1 << 28), FRQCRB);
+ /* nullify the divider to prepare for the next time */
+ ret = div4_clk_ops->set_rate(clk, rate / 2);
+ if (!ret)
+ ret = frqcr_kick();
+ if (ret > 0)
+ ret = 0;
+ } else {
+ /* Enable the divider */
+ __raw_writel(__raw_readl(FRQCRB) | (1 << 28), FRQCRB);
+
+ ret = frqcr_kick();
+ if (ret >= 0)
+ /*
+ * set the divider - call the DIV4 method, it will kick
+ * FRQCRB too
+ */
+ ret = div4_clk_ops->set_rate(clk, rate);
+ if (ret < 0)
+ goto esetrate;
+ }
+
+esetrate:
+ __clk_put(clk->parent);
+ return ret;
+}
+
+static long zclk_round_rate(struct clk *clk, unsigned long rate)
+{
+ unsigned long div_freq = div4_clk_ops->round_rate(clk, rate),
+ parent_freq = clk_get_rate(clk->parent);
+
+ if (rate > div_freq && abs(parent_freq - rate) < rate - div_freq)
+ return parent_freq;
+
+ return div_freq;
+}
+
+static unsigned long zclk_recalc(struct clk *clk)
+{
+ /*
+ * Must recalculate frequencies in case PLL0 has been changed, even if
+ * the divisor is unused ATM!
+ */
+ unsigned long div_freq = div4_clk_ops->recalc(clk);
+
+ if (__raw_readl(FRQCRB) & (1 << 28))
+ return div_freq;
+
+ return clk_get_rate(clk->parent);
+}
+
+static int kicker_set_rate(struct clk *clk, unsigned long rate)
+{
+ if (__raw_readl(FRQCRB) & (1 << 31))
+ return -EBUSY;
+
+ return div4_clk_ops->set_rate(clk, rate);
+}
+
+static void div4_clk_extend(void)
+{
+ int i;
+
+ div4_clk_ops = div4_clks[0].ops;
+
+ /* Add a kicker-busy check before changing the rate */
+ kicker_ops = *div4_clk_ops;
+ /* We extend the DIV4 clock with a 1:1 pass-through case */
+ zclk_ops = *div4_clk_ops;
+
+ kicker_ops.set_rate = kicker_set_rate;
+ zclk_ops.set_rate = zclk_set_rate;
+ zclk_ops.round_rate = zclk_round_rate;
+ zclk_ops.recalc = zclk_recalc;
+
+ for (i = 0; i < DIV4_NR; i++)
+ div4_clks[i].ops = i == DIV4_Z ? &zclk_ops : &kicker_ops;
+}
+
enum { DIV6_VCK1, DIV6_VCK2, DIV6_VCK3, DIV6_ZB1,
DIV6_FLCTL, DIV6_SDHI0, DIV6_SDHI1, DIV6_SDHI2,
DIV6_FSIA, DIV6_FSIB, DIV6_SUB,
@@ -450,7 +550,7 @@ static struct clk *late_main_clks[] = {
};
enum { MSTP001,
- MSTP129, MSTP128, MSTP127, MSTP126, MSTP125, MSTP118, MSTP116, MSTP100,
+ MSTP129, MSTP128, MSTP127, MSTP126, MSTP125, MSTP118, MSTP116, MSTP112, MSTP100,
MSTP219, MSTP218, MSTP217,
MSTP207, MSTP206, MSTP204, MSTP203, MSTP202, MSTP201, MSTP200,
MSTP331, MSTP329, MSTP328, MSTP325, MSTP323, MSTP322,
@@ -471,6 +571,7 @@ static struct clk mstp_clks[MSTP_NR] = {
[MSTP125] = MSTP(&div6_clks[DIV6_SUB], SMSTPCR1, 25, 0), /* TMU0 */
[MSTP118] = MSTP(&div4_clks[DIV4_B], SMSTPCR1, 18, 0), /* DSITX0 */
[MSTP116] = MSTP(&div4_clks[DIV4_HP], SMSTPCR1, 16, 0), /* IIC0 */
+ [MSTP112] = MSTP(&div4_clks[DIV4_ZG], SMSTPCR1, 12, 0), /* SGX */
[MSTP100] = MSTP(&div4_clks[DIV4_B], SMSTPCR1, 0, 0), /* LCDC0 */
[MSTP219] = MSTP(&div6_clks[DIV6_SUB], SMSTPCR2, 19, 0), /* SCIFA7 */
[MSTP218] = MSTP(&div4_clks[DIV4_HP], SMSTPCR2, 18, 0), /* SY-DMAC */
@@ -513,6 +614,9 @@ static struct clk_lookup lookups[] = {
CLKDEV_CON_ID("r_clk", &r_clk),
CLKDEV_DEV_ID("smp_twd", &twd_clk), /* smp_twd */
+ /* DIV4 clocks */
+ CLKDEV_DEV_ID("cpufreq-cpu0", &div4_clks[DIV4_Z]),
+
/* DIV6 clocks */
CLKDEV_CON_ID("vck1_clk", &div6_clks[DIV6_VCK1]),
CLKDEV_CON_ID("vck2_clk", &div6_clks[DIV6_VCK2]),
@@ -604,8 +708,11 @@ void __init sh73a0_clock_init(void)
for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
ret = clk_register(main_clks[k]);
- if (!ret)
+ if (!ret) {
ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
+ if (!ret)
+ div4_clk_extend();
+ }
if (!ret)
ret = sh_clk_div6_reparent_register(div6_clks, DIV6_NR);