[PATCH v2 02/24] serial: mpc512x: cleanup clock API use
Gerhard Sittig
gsi at denx.de
Thu Jul 18 13:00:33 EDT 2013
cleanup the clock API use of the UART driver which is shared among the
MPC512x and the MPC5200 platforms
- get, prepare, and enable the MCLK during port allocation; disable,
unprepare and put the MCLK upon port release; hold a reference to the
clock over the period of use; check for and propagate enable errors
- fix a buffer overflow for clock names with two digit PSC index numbers
- stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only
switch to a fixed string later after device tree based clock lookup
will have become available
the omission in the clock handling previously went unnoticed, but will
become fatal in the common clock scenario
to achieve support for MPC512x which is neutral to MPC5200, the
modification was done as follows
- introduce "clock alloc" and "clock release" routines in addition to
the previous "clock enable/disable" routine in the psc_ops struct
- make the clock allocation a part of the port request (resource
allocation), and make clock release a part of the port release, such
that essential resources get allocated early
- just enable/disable the clock from within the .clock() callback
without any allocation or preparation as the former implementation
did, since this routine is called from within the startup and shutdown
callbacks
- all of the above remains a NOP for the MPC5200 platform (no callbacks
are provided on that platform)
- implementation note: the clock gets enabled upon allocation already
just in case the clock is not only required for bitrate generation but
for register access as well
Signed-off-by: Gerhard Sittig <gsi at denx.de>
---
drivers/tty/serial/mpc52xx_uart.c | 100 ++++++++++++++++++++++++++++++-------
1 file changed, 83 insertions(+), 17 deletions(-)
diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c
index e1280a2..98a1f43 100644
--- a/drivers/tty/serial/mpc52xx_uart.c
+++ b/drivers/tty/serial/mpc52xx_uart.c
@@ -107,6 +107,8 @@ struct psc_ops {
unsigned int (*set_baudrate)(struct uart_port *port,
struct ktermios *new,
struct ktermios *old);
+ int (*clock_alloc)(struct uart_port *port);
+ void (*clock_relse)(struct uart_port *port);
int (*clock)(struct uart_port *port, int enable);
int (*fifoc_init)(void);
void (*fifoc_uninit)(void);
@@ -616,31 +618,75 @@ static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port)
return IRQ_NONE;
}
-static int mpc512x_psc_clock(struct uart_port *port, int enable)
+static struct clk *psc_mclk_clk[MPC52xx_PSC_MAXNUM];
+
+/* called from within the .request_port() callback (allocation) */
+static int mpc512x_psc_alloc_clock(struct uart_port *port)
{
- struct clk *psc_clk;
int psc_num;
- char clk_name[10];
+ char clk_name[16];
+ struct clk *clk;
+ int err;
+
+ psc_num = (port->mapbase & 0xf00) >> 8;
+ snprintf(clk_name, sizeof(clk_name), "psc%d_mclk", psc_num);
+ clk = clk_get(port->dev, clk_name);
+ if (IS_ERR(clk)) {
+ dev_err(port->dev, "Failed to get MCLK!\n");
+ return PTR_ERR(clk);
+ }
+ err = clk_prepare_enable(clk);
+ if (err) {
+ dev_err(port->dev, "Failed to enable MCLK!\n");
+ clk_put(clk);
+ return err;
+ }
+ psc_mclk_clk[psc_num] = clk;
+ return 0;
+}
+
+/* called from within the .release_port() callback (release) */
+static void mpc512x_psc_relse_clock(struct uart_port *port)
+{
+ int psc_num;
+ struct clk *clk;
+
+ psc_num = (port->mapbase & 0xf00) >> 8;
+ clk = psc_mclk_clk[psc_num];
+ if (clk) {
+ clk_disable_unprepare(clk);
+ clk_put(clk);
+ psc_mclk_clk[psc_num] = NULL;
+ }
+}
+
+/* implementation of the .clock() callback (enable/disable) */
+static int mpc512x_psc_endis_clock(struct uart_port *port, int enable)
+{
+ int psc_num;
+ struct clk *psc_clk;
+ int ret;
if (uart_console(port))
return 0;
psc_num = (port->mapbase & 0xf00) >> 8;
- snprintf(clk_name, sizeof(clk_name), "psc%d_mclk", psc_num);
- psc_clk = clk_get(port->dev, clk_name);
- if (IS_ERR(psc_clk)) {
+ psc_clk = psc_mclk_clk[psc_num];
+ if (!psc_clk) {
dev_err(port->dev, "Failed to get PSC clock entry!\n");
return -ENODEV;
}
- dev_dbg(port->dev, "%s %sable\n", clk_name, enable ? "en" : "dis");
-
- if (enable)
- clk_enable(psc_clk);
- else
+ dev_dbg(port->dev, "mclk %sable\n", enable ? "en" : "dis");
+ if (enable) {
+ ret = clk_enable(psc_clk);
+ if (ret)
+ dev_err(port->dev, "Failed to enable MCLK!\n");
+ return ret;
+ } else {
clk_disable(psc_clk);
-
- return 0;
+ return 0;
+ }
}
static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np)
@@ -873,7 +919,9 @@ static struct psc_ops mpc5125_psc_ops = {
.cw_disable_ints = mpc5125_psc_cw_disable_ints,
.cw_restore_ints = mpc5125_psc_cw_restore_ints,
.set_baudrate = mpc5125_psc_set_baudrate,
- .clock = mpc512x_psc_clock,
+ .clock_alloc = mpc512x_psc_alloc_clock,
+ .clock_relse = mpc512x_psc_relse_clock,
+ .clock = mpc512x_psc_endis_clock,
.fifoc_init = mpc512x_psc_fifoc_init,
.fifoc_uninit = mpc512x_psc_fifoc_uninit,
.get_irq = mpc512x_psc_get_irq,
@@ -906,7 +954,9 @@ static struct psc_ops mpc512x_psc_ops = {
.cw_disable_ints = mpc512x_psc_cw_disable_ints,
.cw_restore_ints = mpc512x_psc_cw_restore_ints,
.set_baudrate = mpc512x_psc_set_baudrate,
- .clock = mpc512x_psc_clock,
+ .clock_alloc = mpc512x_psc_alloc_clock,
+ .clock_relse = mpc512x_psc_relse_clock,
+ .clock = mpc512x_psc_endis_clock,
.fifoc_init = mpc512x_psc_fifoc_init,
.fifoc_uninit = mpc512x_psc_fifoc_uninit,
.get_irq = mpc512x_psc_get_irq,
@@ -1166,6 +1216,9 @@ mpc52xx_uart_type(struct uart_port *port)
static void
mpc52xx_uart_release_port(struct uart_port *port)
{
+ if (psc_ops->clock_relse)
+ psc_ops->clock_relse(port);
+
/* remapped by us ? */
if (port->flags & UPF_IOREMAP) {
iounmap(port->membase);
@@ -1190,11 +1243,24 @@ mpc52xx_uart_request_port(struct uart_port *port)
err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
"mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
- if (err && (port->flags & UPF_IOREMAP)) {
+ if (err)
+ goto out_membase;
+
+ if (psc_ops->clock_alloc) {
+ err = psc_ops->clock_alloc(port);
+ if (err)
+ goto out_mapregion;
+ }
+
+ return 0;
+
+out_mapregion:
+ release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
+out_membase:
+ if (port->flags & UPF_IOREMAP) {
iounmap(port->membase);
port->membase = NULL;
}
-
return err;
}
--
1.7.10.4
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