summaryrefslogtreecommitdiff
path: root/drivers/clk/sunxi/clk-sun9i-core.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/clk/sunxi/clk-sun9i-core.c')
-rw-r--r--drivers/clk/sunxi/clk-sun9i-core.c119
1 files changed, 85 insertions, 34 deletions
diff --git a/drivers/clk/sunxi/clk-sun9i-core.c b/drivers/clk/sunxi/clk-sun9i-core.c
index 3cb9036d91bb..d8da77d72861 100644
--- a/drivers/clk/sunxi/clk-sun9i-core.c
+++ b/drivers/clk/sunxi/clk-sun9i-core.c
@@ -24,50 +24,51 @@
/**
- * sun9i_a80_get_pll4_factors() - calculates n, p, m factors for PLL1
+ * sun9i_a80_get_pll4_factors() - calculates n, p, m factors for PLL4
* PLL4 rate is calculated as follows
* rate = (parent_rate * n >> p) / (m + 1);
- * parent_rate is always 24Mhz
+ * parent_rate is always 24MHz
*
* p and m are named div1 and div2 in Allwinner's SDK
*/
static void sun9i_a80_get_pll4_factors(u32 *freq, u32 parent_rate,
- u8 *n, u8 *k, u8 *m, u8 *p)
+ u8 *n_ret, u8 *k, u8 *m_ret, u8 *p_ret)
{
- int div;
+ int n;
+ int m = 1;
+ int p = 1;
- /* Normalize value to a 6M multiple */
- div = DIV_ROUND_UP(*freq, 6000000);
+ /* Normalize value to a 6 MHz multiple (24 MHz / 4) */
+ n = DIV_ROUND_UP(*freq, 6000000);
- /* divs above 256 cannot be odd */
- if (div > 256)
- div = round_up(div, 2);
+ /* If n is too large switch to steps of 12 MHz */
+ if (n > 255) {
+ m = 0;
+ n = (n + 1) / 2;
+ }
+
+ /* If n is still too large switch to steps of 24 MHz */
+ if (n > 255) {
+ p = 0;
+ n = (n + 1) / 2;
+ }
- /* divs above 512 must be a multiple of 4 */
- if (div > 512)
- div = round_up(div, 4);
+ /* n must be between 12 and 255 */
+ if (n > 255)
+ n = 255;
+ else if (n < 12)
+ n = 12;
- *freq = 6000000 * div;
+ *freq = ((24000000 * n) >> p) / (m + 1);
/* we were called to round the frequency, we can now return */
- if (n == NULL)
+ if (n_ret == NULL)
return;
- /* p will be 1 for divs under 512 */
- if (div < 512)
- *p = 1;
- else
- *p = 0;
-
- /* m will be 1 if div is odd */
- if (div & 1)
- *m = 1;
- else
- *m = 0;
-
- /* calculate a suitable n based on m and p */
- *n = div / (*p + 1) / (*m + 1);
+ *n_ret = n;
+ *m_ret = m;
+ *p_ret = p;
}
static struct clk_factors_config sun9i_a80_pll4_config = {
@@ -89,7 +90,17 @@ static DEFINE_SPINLOCK(sun9i_a80_pll4_lock);
static void __init sun9i_a80_pll4_setup(struct device_node *node)
{
- sunxi_factors_register(node, &sun9i_a80_pll4_data, &sun9i_a80_pll4_lock);
+ void __iomem *reg;
+
+ reg = of_io_request_and_map(node, 0, of_node_full_name(node));
+ if (!reg) {
+ pr_err("Could not get registers for a80-pll4-clk: %s\n",
+ node->name);
+ return;
+ }
+
+ sunxi_factors_register(node, &sun9i_a80_pll4_data,
+ &sun9i_a80_pll4_lock, reg);
}
CLK_OF_DECLARE(sun9i_a80_pll4, "allwinner,sun9i-a80-pll4-clk", sun9i_a80_pll4_setup);
@@ -139,8 +150,18 @@ static DEFINE_SPINLOCK(sun9i_a80_gt_lock);
static void __init sun9i_a80_gt_setup(struct device_node *node)
{
- struct clk *gt = sunxi_factors_register(node, &sun9i_a80_gt_data,
- &sun9i_a80_gt_lock);
+ void __iomem *reg;
+ struct clk *gt;
+
+ reg = of_io_request_and_map(node, 0, of_node_full_name(node));
+ if (!reg) {
+ pr_err("Could not get registers for a80-gt-clk: %s\n",
+ node->name);
+ return;
+ }
+
+ gt = sunxi_factors_register(node, &sun9i_a80_gt_data,
+ &sun9i_a80_gt_lock, reg);
/* The GT bus clock needs to be always enabled */
__clk_get(gt);
@@ -194,7 +215,17 @@ static DEFINE_SPINLOCK(sun9i_a80_ahb_lock);
static void __init sun9i_a80_ahb_setup(struct device_node *node)
{
- sunxi_factors_register(node, &sun9i_a80_ahb_data, &sun9i_a80_ahb_lock);
+ void __iomem *reg;
+
+ reg = of_io_request_and_map(node, 0, of_node_full_name(node));
+ if (!reg) {
+ pr_err("Could not get registers for a80-ahb-clk: %s\n",
+ node->name);
+ return;
+ }
+
+ sunxi_factors_register(node, &sun9i_a80_ahb_data,
+ &sun9i_a80_ahb_lock, reg);
}
CLK_OF_DECLARE(sun9i_a80_ahb, "allwinner,sun9i-a80-ahb-clk", sun9i_a80_ahb_setup);
@@ -210,7 +241,17 @@ static DEFINE_SPINLOCK(sun9i_a80_apb0_lock);
static void __init sun9i_a80_apb0_setup(struct device_node *node)
{
- sunxi_factors_register(node, &sun9i_a80_apb0_data, &sun9i_a80_apb0_lock);
+ void __iomem *reg;
+
+ reg = of_io_request_and_map(node, 0, of_node_full_name(node));
+ if (!reg) {
+ pr_err("Could not get registers for a80-apb0-clk: %s\n",
+ node->name);
+ return;
+ }
+
+ sunxi_factors_register(node, &sun9i_a80_apb0_data,
+ &sun9i_a80_apb0_lock, reg);
}
CLK_OF_DECLARE(sun9i_a80_apb0, "allwinner,sun9i-a80-apb0-clk", sun9i_a80_apb0_setup);
@@ -266,6 +307,16 @@ static DEFINE_SPINLOCK(sun9i_a80_apb1_lock);
static void __init sun9i_a80_apb1_setup(struct device_node *node)
{
- sunxi_factors_register(node, &sun9i_a80_apb1_data, &sun9i_a80_apb1_lock);
+ void __iomem *reg;
+
+ reg = of_io_request_and_map(node, 0, of_node_full_name(node));
+ if (!reg) {
+ pr_err("Could not get registers for a80-apb1-clk: %s\n",
+ node->name);
+ return;
+ }
+
+ sunxi_factors_register(node, &sun9i_a80_apb1_data,
+ &sun9i_a80_apb1_lock, reg);
}
CLK_OF_DECLARE(sun9i_a80_apb1, "allwinner,sun9i-a80-apb1-clk", sun9i_a80_apb1_setup);